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Instructions For Servicing The Necchi Supernova Sewing Machine

1. Disconnect pull rod A from pin B Fig 37 by pushing it to the left with a screw driver or still better with a finger To facilitate this operation remove first the cams from the ma chine then swing the cam disengaging lever entirely backward toward the machine arm Fig 37 Loosen the four screws C completely Raise the mounting plate D for the Automatic Device inward 41 Copyright 2004 Loosen fully two screws A Fig 38 Pull cover away from machine Loosen the two screws 8 which hold collar 9 Fig 35 Turn the stitch length regulating knob counterclockwise to ze ro 0 Turn the flywheel until the eccentric 20026 of the upper shaft reaches the position as shown in Fig 36 Insert the gauge 10 6 in such a way that its V shaped upper por tion is exactly inserted between the forks of the feed eccentric connecting rod No D 85506 Fig 36 and at the same time is contacting the eccentric No 20026 In order to reach the right position eventually turn the flywheel by hand in one sense or the other as required When the gauge is correctly inserted the flywheel cannot be moved The lower portion of the gauge 10 7 should rest on the flat alignment portion of rod 1 as shown in Fig 36 In order to reach this position eventually push the reverse stitch button NoTE Be sure that the lower portion of the gauge rests flush on flat portion of rod 1 Fig 36 While keeping the gauge in its
2. Next place the brake spring No A26 3 5 see Fig 93 between the two brake shoes using a thin nosed pair of pliers to bend the spring ends together Place the pull spring transport spring No A26 1 11 on the outside of the lower pulling drum No C A26 3 l This spring cannot be placed onto the pulling drum all at once Slip on spiral after spiral Make sure that the spirals are close to each other without overlapping and that they all stay close to the cylinder of the pulling drum By means of a thin nosed pair of pliers push the two brake shoes No A26 3 4 toward each other and then move both brake shoes at one time until the distance between the pro truding end of Spring A26 1 11 and the Hole A is equal Hole A A 2 6 3 4 About 0 703 to about 11 16 The Hole A is the one of the two holes on the brake shoes which is at a greater distance from the end of Spring No A26 1 11 This adjustment is necessary in order to ensure that Hole A is visible through the Window B Fig 97 on Drum No C A26 3 6 during the subsequent assembling operations 110 Copyright 2004 Preassembling of group Fig 95 Place the thin washer No A26 3 9 Fig 96 above the already prepared group as shown in Fig 94 so that the small hole A of this washer is exactly above the hole A of assembly Fig 94 Place the washer on assembly Fig 94 as shown in Fig 96 If during this assembly procedure the position of the hole in t
3. To insert the distance blade swing the feed contact finger No D A 26 1 14 back from Gauge No 10 2 by operating the cam con necting lever No D A 26 3 25 Then push the cam connecting lever back again to r j i E D A 26 1 14 101 Copyright 2004 Let the machine run with the same speed as under 1 the material should not move backward with the same very slow almost imperceptible motion as under test 1 If the conditions put forward under the first and second part of the above test are not met correct them in the following way Loosen the nut A see Fig 86 using wrench No 20 6 Turn the counter nut B either clockwise or counter clockwise until the desired adjustment is obtained Usually very little move ment of the nut is required Fig 88 The two adjustments of nut A and counter nut B are made at the same time using two wrenches No 20 6 Fig 102 Copyright 2004 Tighten the counter nut B Check again whether the requirements for the first and second parts of the adjustment are met Some troubles and their remedies The machine moves backward during the first part of the test instead of forward Solution Loosen nut A turn counter nut B clockwise which is identical with lengthening the Rod A A 26 3 21 then tighten the nut A The machine moves forward during the second part of the test instead of backward Solution Loosen nut A turn counter nut B counter
4. 85663 ON THE NEEDLE POSITIONING LEVER N C 85662 Fig 81 86 ADJUSTMENT OF THE AXIAL PLAY END PLAY OF THE UPPER SHAFT 87 ADJUSTMENT OF THE CONTACT FINGERS N A 26 1 23 AND N A 26 1 13 WHICH REGULATE THE POSITION OF THE NEEDLE AND THAT OF THE ZIG ZAG WIDTH REGULATING LEVER 89 ADJUSTMENT OF THE FEED REGULATING ROD WHICH REGULATES THE AUTOMATIC LENGTH OF THE STITCH N A 26 3 21 92 t Some Troubles and their Remedies 95 ADJUSTMENT OF THE NUMBER OF IMPULSES FOR EACH TURN OF THE CAM AXLE 96 How to count the Number of Impulses of the Cam Axle 98 4 Copyright 2004 Pages ASSEMBLING THE PARTS UNDERNEATH THE MOUNT ING PLATE N C A 26 1 1 OF THE AUTOMATIC DE VICE Fig 93 100 Preparation of assembling the group as shown in fig 94 101 Preassembling of group Fig 95 102 How to adjust the group of Fig 95 in the mounting Plate N C A 26 1 1 for the Automatic Device see Fig 98 104 TAKING CARE OF THE SEWING MACHINE MOTOR 108 A Motor does not run at all or runs only sluggishly 108 B How to replace the motor brushes 109 C Motor turns tightly HI D Motor runs but does not pull machine 112 E Motor is weak 112 F Motor gets too hot 112 G Motor smokes or emits a burning smell 113 H Motor runs noisily or growls Rattling noise during Sewing 113 5 Copyright 2004 FOREWORD This service manual shall be used together with the instruction book for the SUPERNOVA Sewing Machin
5. the thread tension knob first and then take off successively all other parts of this mechanism Fig 66 All these parts shall be cleaned thoroughly in a pan filled with cleaning fluid and then be wiped dry Every part must be examined thoroughly with regard to possible defects The tension discs must not have rust spots on their contact faces or deep grooves worn into them by the thread Defective tension discs must be corrected if possible Place the contact faces of such repaired discs together and check whether they touch each other fully If the tension discs or any other part of the tension mechanism are defective beyond repair replace them with new parts After having cleaned and examined all parts of the tension mechanism replace them in their original positions Then adjust the pressure upon the tension discs until the correct tension has been obtained Note To clean the upper tension mechanism it is not necessary to take it off completely it is sufficient to unscrew the knurled knob and remove all parts that are assembled on the split stud F as shown in Fig 66 While re assembling these parts make certain that check spring E is set in notch S of the bushing G also make certain that the tension discs A B C and D are placed in the right order and their faces are set as shown in Fig 66 74 Copyright 2004 Fig 66 1 The thread take up spring check spring of the upper tension This check spr
6. 40 Fig 44 Turn the balance wheel slowly toward you and bring the eccentric A to the right as shown in Fig 44 Insert gauge U through the plate S and by turning the balance wheel toward you bring the eccentric A in sucha position that the V shaped cut out of the timing gauge U fits properly against the back portion of this eccentric Fig 45 In this position the balance wheel cannot be turned further and the gauge U is pressed firmly against the eccentric A In the position described above the needle bar must be in its highest position and the needle bar connecting link No D 26020 must be in a vertical position Fig 45 48 Copyright 2004 49 Copyright 2004 If this condition is not met proceed as follows Loosen the screws E of the worm gear F Fig 45 on the upper shaft Take gauge U and place it against the eccentric A in or der to block this eccentric then turn the balance wheel toward you until the needle bar is in its highest position Fig 45 Firmly tighten the two screws E of the worm gear F then take away gauge U Take away gauge plate S and replace it with the zig zag me chains m cover plate No 85621 22 2 7 23 24 27 26 29 Fig 46 50 Copyright 2004 HOW TO DISMANTLE THE UPPER GROUP OF THE ZIG ZAG MECHANISM FIGS 46 AND 47 Remove the top cover Remove the mounting plate for the Automatic device Remove the zig zag mech
7. It is advisable if not necessary not to remove the vertical shaft 31 This will enable you to maintain the proper height of the needle positioning lever during the assembly of the machine HOW TO ASSEMBLE THE UPPER GROUP OF THE ZIG ZAG MECHANISM FIG 46 On stud 38 wich is permanently fixed in the machine arm with a retaining ring 37B assemble the parts mentioned below in the following order Place the two lever assemblies 20 and 17 upon each other as shown in Fig 48 and close this assembly with a retaining ring 37A on top of this stud shift the eccentric No 20026 towards the right until it comes in contact with the upper shaft Insert the roller 16 on the lower portion of the stud in the link 35 of the vertical shaft as indicated in Fig 49 Fig 49 HECCML 54 Copyright 2004 Move the lever assembly 17 and the small link 35 so that the roller 16 enters the channel groove of lever assembly 17 AS Pl Pi ri Pig 00 Place and line up the washer 14 see Figs 46 and 50 on top of the hole in the upper arm then insert pin 15 Take lever assembly 13 introduce it between the upper shaft and the rear wall of the machine pass it below the upper shaft so that its bearing E is placed above the washer 14 and the ec centric 22 enters the two sides A and B of the channel see Fig 50 Insert pin 15 into bearing E of the lever assembly and thr
8. again the two screws 8 After having made the above adjustments it is indispensable to recheck the adjustment c and d as explained in chapter Important Adjustments on the Stitch Length Regulating Knob ADJUSTMENT OF THE FEED DOG DISENGAGING MECHANISM SEE FIGS 79 AND 80 The adjustment of the Feed Dog Disengaging Mechanism has to be made with the aid of the screw No 042090 GAB and the nut No 041030 DA When the knob No D 85559 is completely down in the darning position the conical part No 85545 must come out completely from its position in part No 85544 see Fig 79 In the illustrations Figs 79 and 80 a sectional view of part No 85544 is given to clarify these illustrations Therefore when the knob D 85559 is completely pressed down then conical part No 85545 must disen gage the part No 85544 91 Copyright 2004 041030 DA 035150GAN W w A 042090 GAB 85545 85544 85589 Fig 79 D8555 85589 Fig g 80 041030 DA 042090 GAB 035150 GAN Conversely when the knob No 13 85559 is completely raised see Fig 80 there must be a space of about 3 64 between the push pin No 85589 and the conical part No 85545 92 Copyright 2004 It is indispensable to make these adjustments when the machine is already completely assembled no matter whether with or without the Automatic If an adjustment has to be made proceed as follows Raise the knob No D 85559 completely upward Loosen
9. and 75 By means of the tool shown in Fig 47 remove the snap ring 2 which is holding the pivot C of the stitch length lever 4 Fig 74 The stitch length lever 4 can be now taken out by pushing it toward the inside of the machine Disengage the plate 5 by pushing down the reverse sewing control button Note Do not remove the bushing 6 with its retaining ring 7 In case the replacement of bushing 6 should be required care must be taken to the effect that the new bushing is placed in the right position so that the free end of the small stud in plate 5 Fig 75 is neither too close to nor too far from the stitch regulating shaft HOW TO REMOVE THE STITCH LENGTH REGULATING KNOB AND THE REGULATING SHAFT FIG 75 Loosen the screws 8 as well as the screws 10 on bush ing 9 Take off stitch length regulating knob 12 In taking off this knob care must be taken so that washer 16 as well as spring washers 14 Fig 75 are not lost Take off the regulating shaft 11 along with its pin 13 by drawing it toward you until the rear end of pin 13 comes out of its hole HOW TO REASSEMBLE THE STITCH LENGTH REGULATING KNOB AND THE REGULATING SHAFT Take the regulating shaft 11 and insert the shorter end of its pin 13 into the bushing 9 as shown in Fig 75 84 Copyright 2004 20026 0 011 0 015 D85506 Fig 76 Insert the longer end portion of the regulating shaf
10. as advised above Motor is not oiled at all wrong lubricant has been used motor is over oiled oil on commentator Have motor thoroughly clean ed as suggested above Motor runs tightly due to bent shaft Have motor repaired Motor runs noisily or groivls Rattling noise during sewing Motor pulley is not in perfect alignment with balance wheel of machine Adjust motor pulley on motor shaft until belt runs straight up to balance wheel Motor hums while machine is not sewing Rheostat control lever gets stuck in a depressed position Check rheostat and free the motion of the control lever Motor pulley is loose on motor shaft Tighten screw in motor pulley Motor bracket too loose on machine or motor too loose on motor bracket Tighten firmly all fastening screws which hold the above parts in place It must be emphasized that all motors on our machines are carefully made inspected and tested Therefore handle each motor with care do not dismantle or tamper with it unless you are thoroughly acquainted with its construction Do not damage or scratch the motor housing do not drop the motor Do not make a motor entirely useless by unnecessarily damaging it beyond repair 122 Copyright 2004
11. during the assembly of the machine and should not be repeated in case it should be necessary to remove this lever from the machine or assemble it again with the machine The readjustment of the eccentric No 85663 is only necessary when the needle positioning lever has to be changed After having reassembled the machine without the Automatic with the new positioning lever and after having replaced the spring No 85658 Fig 81 proceed as follows Set the machine for straight stitching needle positioning lever in center position and zig zag width lever completely to the left Bring the needle bar to its highest position Without running the machine move the zig zag width lever se veral times back and forth If the eccentric No 85663 is not in its correct position the needle bar without moving up or down will move sidewise from left to right and vice versa To correct this occurrence proceed as follows Loosen slightly the screw No 035040 FG which fastens the ec centric No 85663 to the needle positioning lever No C 85662 Insert a screw driver into the groove of the eccentric No 85663 turn it clockwise as explained under c until the needle bar is not moving sideways any more See to it that the stud A of the zig zag width lever No A 85606 Fig 81 touches the adjustable eccentric Firmly tighten the screw No 035040 FG which holds the eccentric on the needle positioning lever 94 Copyright 2004 C85662
12. in our factory during the assembly We therefore can guarantee their perfection In some cases as for example the timing of shuttle and needle bar the parts are fixed together by pins and therefore the timing will never change Timing of shuttle and needle bar in the SUPERNOVA Adjustment Height of the Needle Bar Turn the balance wheel by hand toward you until the point of the shuttle is just at the center of the rising needle At this moment the point of the shuttle should be about 1 16 above the upper part of the needle eye Fig 16 If the distance a is more or less than 1 16 an adjustment is necessary Loosen slightly screw No 24 Fig 17 in the needle bar connecting stud No 26025 so that the needle bar No D 20037 is still held in position by friction Now without turning the balance wheel push the needle bar up or down by hand until the distance a is equal to about 1 16 Tighten screw No 24 firmly after this adjustment This adjustment can also be achieved with the aid of the TIMING GAUGE No 10 5 The gauge is composed of a body similar to the shuttle and of a false needle gauge pin contained in the upright of 21 Copyright 2004 Fig 16 Fig 17 the gauge so that it will not be misplaced In the following a description of the use of this gauge is given Insertion of the TIMING GAUGE No 10 5 Turn the balance wheel by hand and bring the needle bar to its highest position Fig 18 Repl
13. machine in good order it is essential to clean the shuttle as well as all other 79 Copyright 2004 0 012 Fig 72 vital parts of the stitch mechanism frequently and thoroughly and to remove all dirt lint and pieces of thread which may have accumulated in the machine Remove also any residues gummed oil caused by the use of improper lubricant The same care must be applied to the raceway in the race body and to the race cover They must be cleaned frequently and thoroughly It is also essential to keep free and clean the vertical groove channel in the lower portion of the race body which serves to let any dirt etc escape A space of about 0 012 Fig 72 between the shuttle and shuttle carrier spring No 20194 is required for the passage of the thread Changes of the clearance between shuttle and shuttle carrier spring may occur when The shuttle carrier spring No 20194 is deformed for instance due to jamming of the shuttle in the race body 80 Copyright 2004 The fastening screws No 20195 somehow have become loose Too much play between shuttle and shuttle carrier spring will cause excessive noise and will influence the timing of the oscillating shuttle It is also advisable to check from time to time whether the shuttle is still timed correctly Furthermore also check whether the point of the shuttle has been blunted or whether those portions of the shuttle over which the thread passes have bec
14. needle is still in the fabric If the feed dog is not correctly timed in relation to the needle adjust as follows Remove the top cover 34 Copyright 2004 Open the small cover A Fig 32 Loosen full screw B without taking it away Raise the top cover holding it at the left end When replacing the top cover it is necessary that the hook C Fig 32 and the pin D on the arm enter into their component positions in the top eke Fig 32 Turn the flywheel until the two screws 048080 GEB of the feed dog eccentric 20026 Fig 33 are visible and loosen them slightly Turn the feed dog eccentric on the upper shaft C 85201 taking care not to move it sideways until the feed dog is in the correct position as already explained above After the adjustment has been made tighten the two screws 048080 GEB securely 35 Copyright 2004 048080 GEB Ces20r Fig B 20026 048080GEB The timing of the feed dog and needle bar can be made with the help of the gauge 10 3 Fig 34 Insert the pin B of the gauge into the timing hole of the feed dog eccentric A 20026 Turn the flywheel slowly toward you until the gauge rests on the two side rims of the machine as shown in Fig 34 If the timing is correct the needle bar E should now be at its lowest position and the connecting link H Fig 34 should be in a straight vertical position If the position is not correct rectify it in the following way loo
15. pulling drum No C A26 3 6 shown in Fig 93 112 Copyright 2004 How to adjust the group of Fig 95 in the mounting plate No C A26 1 1 for the automatic device see Fig 98 Make certain that the two holes A Fig 96 coincide and are visible in the window B see Fig 97 of the upper pulling drum No C A26 3 6 NOTE The stud L see Fig 98 of mounting plate No ey must enter into both holes A Fig 97 Take group of Fig 95 in your left hand holding it as its lower portion and with your right hand place the Automatic plate No C A26 1 1 over it Make certain that the cam axle R enters the cam axle bear ing M of the Automatic plate and the stud L enters through window B into both holes A of Fig 96 Place distance washer No A26 3 14 on top of cam axle as shown in Fig 99 Secure cam axle by means of retaining ring No 400090BZ Hook on the springs No A26 3 18 and No A26 3 12 as shown in Fig 100 113 Copyright 2004 C A 26 i i Fig The most important points to be watched when assembling this group are as follows Make certain that the stud L of the Automatic plate see Fig 98 has entered the hole A indicated in Fig 94 This hole is the one farthest away from the end of the spring No A26 1 11 The windings of the pull spring No A26 1 11 must not overlap each other Furthermore the end of this spring which is tightly held by the small plate No
16. replace the motor brushes The motor brushes are replaced in the following way Loosen and remove the motor cover of the machine Loosen and remove the two screws A and B which hold the motor support on the base of the machine 118 Copyright 2004 Take the motor out of the machine but do not pull out the motor cable from the hole in the bed plate Fig 103 Unscrew the two cups C and D Fig 104 which hold the brushes and replace the old brushes with new ones Replace the two cups C and D Place the motor back into the interior of the machine While replacing the motor into the machine take care that the feed eccentric connecting rod No D 85506 Fig 102 does not touch the motor casing the motor belt is sufficiently tight Align the motor with the two screws A and B Fig 102 Fig 103 the motor pulley is aligned with the belt groove of the balance wheel to avoid the belt being worn out on one side only Adjvist the motor position if necessary by means of the two screws A and B 119 Copyright 2004 Fig 1u m c Motor turns tightly Motor shaft is bent due to Motor having been dropped V belt having been forced over the motor pulley after mo tor was mounted in place on the machine Handle motor carefully to prevent above defect Have defective motor repaired Motor bearings are gummed due to use of improper oil Have bearings cleaned with cleaning fluid Motor must be thor
17. right place by one hand with the other hand turn the regulating shaft counterclockwise around its axle until it can go no further This means the pin 1 at the end of reverse stitch plate 5 is now inserted in the groove of the stitch regulating shaft completely Fig 35 NOTE While turning the stitch regulating shaft around its axle push it toward the stitch regulating knob so that the bent portion S of the reverse stitch plate 5 rests on the stitch regulating lever plate 4 Figs 35 and 36 Tighten the two screws 8 firmly and remove the gauge 10 6 42 Copyright 2004 43 Copyright 2004 Timing of the automatic control eccentric A 85241 Fig 39 General Rules The automatic control eccentric controls the impulses of the cam axle and has to be adjusted so that while sewing a zig zag automatically the cam axle makes each of the single impulses when the needle bar is on its way upward The timing without gauge has to be done as follows Remove the automatic mechanism mounting plate Bring the needle bar to its highest position In this position the highest point of the eccentric must be on top of the upper shaft Firmly tighten the screw 85279 taking care to avoid end play in the upper shaft H 85279 Fig 39 44 Copyright 2004 The timing of the eccentric A 85241 in relation to the needle bar can be made with the help of the gauge 10 7 by following this procedure Remove the automatic m
18. sen the two screws 048080 GEB of the eccentric 20026 Fig 33 and place the gauge 10 3 over the two side rims of the machine then insert the pin B in the corresponding hole of the eccentric 20026 and turn the flywheel until the needle bar is in the lowest position Tighten the two screws securely 048080 GEB after the adjust ment The above mentioned procedure is only made if the feed dog does not move correctly in relation to the needle bar 36 Copyright 2004 Fig 34 Fig 34 a Timing the regulating shaft of the stitch length regulating knob Fig 35 Before starting remove cams from machine as explained previously then swing cam disengaging lever entirely to the right as far as it will go and proceed as follows 37 Copyright 2004 Loosen the screws 8 which hold the collar 9 to the shaft A Do not loosen the two screws 10 Turn the stitch length regulating knob counterclockwise to zero 0 lt lt K Bee En Essos 5 Fig 35 38 Copyright 2004 Gripping the shaft 13 by hand turn it counterclockwise until the pin 1 of the reverse plate is completely in the groove In this position the shaft is blocked and cannot move any further To check the above adjustment 3 proceed as follows Slightly tighten the two screws 8 of the collar 9 Press upon the reverse push button It must not move If this is not the case repeat adjustment 3 as explained above Sli
19. the arm and the bed Arm and bed are firmly held together by means of screws and pins In the horizontal portion of the arm is inserted the arm shaft upper 6 Copyright 2004 Shaft which obtains its rotary movement from the revolving balance wheel The balance wheel which is securely fastened to the right hand end of the arm shaft is driven by a belt from an electric motor The various movable parts of the sewing machine obtain their respective movements from the rotary of the arm shaft with the aid of connecting rods cranks levers etc Below the bed of the machine is mounted the oscillating shaft driver shaft to the left end of which is firmly attached the shuttle carrier By means of a crank connecting rod and oscillating rock shaft a slide block and a shaft crank the rotary movement of the arm shaft is transformed into the oscillating movement of the carrier shaft The shuttle carrier in turn imparts the oscillating movement to the oscillating shuttle which moves back and forth inside of the shuttle race The forward and backward as well as the up and down movements of the feed dog are also obtained from the rotary movement of the arm shaft by means of connect ing rods rock shafts and a feed bar below the bed of the machine The up and down movement of the needle bar as well as that of the thread take up lever is also derived from the rotary movement of the arm shaft by means of cranks and a connecting link The bob
20. 03 5040 FG A C85664 Fig 81 The above adjustment of course is only valid if the vertical gear No C 85664 Fig 81 is already in its proper place and the gear has not changed its correct position ADJUSTMENT OF THE AXIAL PLAY END PLAY OF THE UPPER SHAFT The eccentric No A 85241 Fig 82 which induces the impulses of the cam axle is also being used for regulating the axial play of the upper shaft After a long time of use the upper shaft of the machine may possibly have more axial play than is permissible In order to eliminate this play proceed as follows 95 Copyright 2004 Fig 82 Take off top cover and open face plate of the machine Pass Allen wrench socket wrench No 20 5 1 8 through the hole in the mounting plate for the automatic device Fig 82 and loosen slightly the screw No 85279 on the eccentric No A 85241 With one hand push the counterweight d ihe upper shaft toward the interior of the machine With the other hand and the Allen wrench No 20 5 push the eccentric No A 85241 toward the shaft bearing adjacent to the eccentric Firmly tighten screw No 85279 and check if the axial play of the upper shaft is completely eliminated There should be no play at all of the axial shaft and also no hard point when the balance wheel is being rotated by hand The adjustment mentioned above can also be made when the mounting plate for the automatic device is removed The timing of the eccentric A 8524
21. 1 must be checked every time the axial play of the upper shaft has been readjusted 96 Copyright 2004 ADJUSTMENT OF THE CONTACT FINGERS NO A 26 1 23 AND NO A 26 1 13 WHICH REGULATE THE POSITION OF THE NEEDLE AND THAT OF THE ZIG ZAG WIDTH REGULATING LEVER Put the end B of the finger A 261 23 in contact with the gauge No 10 2 and put the rear end C of the finger in contact with the pin D The left branch of fork E must then be in slight contact with the pin F 83 This adjustment is required in order to obtain a perfect execution of the automatic designs The adjustment has to eliminate the play between cam and needle positioning lever and between cam and zigzag width lever General rules Place the gauge No 10 2 on the cam axle and move the cam disconnecting lever No D A 26 3 25 entirely to the left move the zig zag width lever to zero and check whether the contact fingers are in the position as shown in Figs 83 and 84 To adjust proceed as follows the machine should be completely assembled and be at a standstill Place the gauge No 10 2 on the cam axle move needle positioning lever completely to the left and bring the zig zag width lever to zero completely to the left Now move the cam disconnecting 97 Copyright 2004 Put the end G of the G Ad26 i i3 finger A 26 1 13 in f contact with the gauge No 10 2 and put the rear end L of the finger in contact with the pin H The left branch of the
22. 4 Fig 41 must occupy either position I or position Il in the channel of the oscillating lever C Fig 42 If the needle bar is in its highest position but the eccentric A Fig 41 position position H Fig 42 46 Copyright 2004 u Fig 43 occupies a position other than those described above then loosen first the two screws E of the worm gear F Fig 45 hold the balance wheel firmly thus keeping the needle bar in its highest position and by hand turn the worm gear F around the upper shaft until the eccentric A is in position I or position Il Fig 42 After this adjustment firmly tighten the two screws E Fig 45 The timing of the zig zag movement and the movement of the needle bar can also be performed with the aid of the gauge 10 4 The gauge 10 4 shown in Fig 43 consists of A plate S with a knurled stud serving as a holder During the timing operation this plate S replaces the zig zag mechanism cover plate The notch R serves for positioning of the needle positioning lever and the space T is required for the zig zag width lever A small steel plate U with a handle shaped portion at one end and a V shaped cut out at the other end 47 Copyright 2004 Timing procedure Remove the mounting plate for the Automatic device Replace the zig zag mechanism cover plate with the plate S of gauge 10 4 Adjust the machine for straight sewing see Fig
23. 6330 Fig 24 Adjustment Centering the needle in relation to the race cover plate The single needle A Fig 25 should pass exactly through the center of the slot in the shuttle race cap No 21330 In the twin needle machine the correct position of the needle is that shown in Fig 26 To perform this adjustment rotate the race body No D 26330 without moving it in an axial direction around the carrier shaft No C 26325 Now the screw F can be firmly tightened Fig 24 All four adjustments mentioned can also be achieved with the aid of the TIMING GAUGE No 10 9 27 Copyright 2004 _ The needle A is at equal distance from both edges B Fig 25 Both needles A are at equal distanc es from the edges np Fig f 26 f 26330 b Insertion of the Timing Gauge No 10 9 and of the c Square angled Bar E Fig 27 d Remove the presser foot and the needle plate Remove the needle and the shuttle Insert bar E Fig 27 of the gauge into the needle bar following the same instructions as for the insertion of a needle Loosen screw No 24 of the needle bar connecting stud No 26025 so that the needle bar is still held in position by friction Hold the balance wheel firmly and push the needle bar upwards about 7 32 H Fig 27 By turning the balance wheel toward you by hand bring the needle bar C to its lowest position From this point onward and during the timi
24. 70 shows the bobbin case in a dismantled condition 78 Copyright 2004 THE OSCILLATING SHUTTLE 26337 26339 20 95 21330 26335 26327 025030 FOBS 025130 FOB 20795 025030 DAB Fig 71 bi i p gol iji Fal Oe Hod GED le 2m 26N TA F NB OIS010 FA J0G 60 JA or a 6265450 Mh iy P r k r Fai jj i y A net of i ai fe f CLs a IA YON WY ars Nes ee NSN kee 02634 0 h The shuttle No 26327 see Fig 71 is set in motion by the shuttle carrier No D 26340 with the intermediate aid of the shuttle carrier adjusting spring No 20194 and it retains its position in the race body No D 26330 by means of the race cover No 26333 The race cover is connected at its lower portion with the race body by means of a ring shaped hook No 26339 and is held against No D 26330 the race body with the aid of two knobs No 26337 These knobs are under spring pressure and thus press the race cover against the race body By pulling both knobs away from the race cover and swinging them sideways the race cover can be swung away from the race body whereby the race cover will turn around the aforementioned ring shaped hook The shuttle then can be removed easily from the race body When assembled with the race body the race cover must yieldingly press against the race body This will prevent the shuttle from jamming should pieces of thread dirt etc get between shuttle and race body while the machine is in motion To keep the
25. A26 3 11 must not touch the round portion of the upper pulling drum No C A26 3 6 114 Copyright 2004 Before hooking on the two springs Nos A26 3 18 and A26 3 12 the assembled automatic device check with a finger whether the movement regulating ring No A26 3 15 moves freely in each direction Before inserting the retaining ring No 400090BZ Fig 99 which keeps the entire lower portion of the Automatic device on the mounting plate No C A26 1 1 use one or more distance wash ers No A26 3 14 to eliminate any axiy ofthe cam axle BZ A 26 3 14 C A26 1 1 26 3 15 Fig 99 C A26 1 1 A 26 3 18 A 26 3 12 Fig 100 115 Copyright 2004 Fig 101 To replace the mounting plates proceed as follows Turn the design graduating knob A between 3 and 4 Turn the flywheel toward you so that the eccentric B with the larger part is facing backward in this position the head of the screw C Fig 101 is upward and is visible through the hole P inthe Automatic mounting plate Bring the zig zag lever O and the needle positioning lever N completely to the left Hold the Automatic mounting plate with the left hand and with the right hand move the two pin levers D and E so 116 Copyright 2004 that the two forks F and G are completely to the left Bring the mounting plate above the machine arm so that the 4 holes in the plate are facing the corresponding screw holes in
26. Instructions For Servicing The Neccnhi Supernova sewing Machine 1 Copyright 2004 ANALYTICAL INDEX Pages INSTRUCTIONS TO BE GIVEN TO THE CUSTOMER 1 Using the correct needle 1 Correct threading of the SUPERNOVA when using One needle 2 Threading of the SUPERNOVA when using two need Les twin needle 3 To disconnect the Automatic 4 Changing from Automatic to Straight Sewing Cleaning of shuttle race and feed dog Adjusting the Thread Tensions 8 Cleaning 10 Lubrication 11 ADJUSTING THE MOVEMENTS OF THE VARIOUS GROUPS OF PARTS IN RELATION TO EACH OTHER au TIMING THE MACHINE 12 Timing of shuttle and needle bar in the SUPERNOVA 13 Timing of feed dog and needle bar 26 Timing the regulating shaft of the stitch length re gulating knob Fig 35 29 Timing of the Automatic Control Eccentric A 85241 Fig 39 36 Timing of the zig zag movement and the movement Of the needle bar 38 HOW TO DISMANTLE THE UPPER GROUP OF THE ZIG ZAG MECHANISM Figs 46 and 47 43 HOW TO ASSEMBLE THE UPPER GROUP OF THE ZIG ZAG MECHANISM Fig 46 46 2 Copyright 2004 Pages IMPORTANT ADJUSTMENTS TO BE MADE AFTER THE REASSEMBLY OF THE UPPER GROUP OF THE ZIG ZAG MECHANISM50 MINOR ADJUSTMENTS IN THE UPPER GROUP OF THE ZIG ZAG MECHANISM 51 THE FEED DOG 54 Adjustment of any Looseness in the Feeding Mecha nism 55 Adjusting the Height of Teeth of the Feed Dog above the Needle Plate 55 A
27. ONS TO BE GIVEN TO THE CUSTOMER Using the correct needle The needle must be selected in accordance with the type of material to be sewn the kind of work to be performed and the thickness of the thread to be used see Needle and Thread Chart in Instruction Booklet To insert the needle proceed as follows Turn the balance wheel by hand toward you until the needle bar reaches its highest position then insert the needle so that the flat portion Fig 1 Fig 2 of its shank faces the groove in the needle bar Push the needle up into the needle bar as far as it will go then firmly tighten the screw in the needle clamp so that the needle is held securely in the needle bar see Figs 1 and 2 9 Copyright 2004 Correct threading of the SUPERNOVA when using one needle Proceed as follows mrm Fig 3 Bring the needle to its highest position by tiring the balance wheel towards you 10 Copyright 2004 Place spool of thread H on spool pin and draw thread through thread guide S as shown in Fig 3 Pull thread downward then insert it from right to left between both tension discs and bring it upward again over the check spring D Fig 3 Bring the thread downward under the thread guide tension arm G pass it through the slot F and then upward through the guide hook K Pull the thread upward and pass it from right to left through the eyelet L of the thread take up lever Draw the
28. Place the needle plate in its receptacle and check whether the feed dog is parallel with the slots Remove needle plate again and tighten the screws M firmly Adjustment B If this adjustment is required loosen the screw H which holds the crank L to the feed rock shaft G Fig 60 Rotate the shaft G by hand slightly toward the left or right as required Tighten screw H and check whether all parts are correctly adjusted 67 Copyright 2004 How to check the alignment between the underside of the presser foot and the teeth of the feed dog To make the machine feed correctly and thus to obtain a perfect seam it is necessary that the entire bottom face of the presser foot rests fully flush on all teeth of the feed dog To check whether this requirement is met use a thin piece of paper about 0 03 thick in the following manner first however make certain that both the presser foot and the feed dog are correctly fitted on the machine Turn the balance wheel by hand toward you until the feed dog rises to its highest position above the top surface of the needle plate Lower the presser foot until it rests on the feed dog Lift the presser foot somewhat then insert the piece of thin paper successively between presser foot and feed dog at each of the four corners of the presser foot always lowering the presser foot fully after the paper has been inserted The presser foot rests properly on the feed dog when
29. Reassemble the feed lifting connecting rod No A26345 IMPORTANT ADJUSTMENTS TO BE MADE AFTER THE REASSEMBLY OF THE UPPER GROUP OF THE ZIG ZAG MECHANISM Check the timing of the zig zag movement in relation to the needle bar see chapter Timing of Zig Zag Movement of Needle Bar Center the needle in the hole of the needle plate with the aid of the rod 7 Fig 46 as follows Remove zig zag mechanism cover plate No 85621 and replace it with gauge 10 4 Set the machine for straight sewing in the center position Fig 40 then bring the needle down through the hole in the needle plate use Zig Zag Needle Plate Insert a screw driver through the opening in the zig zag posi tioning plate and loosen screw 29 of block 27 Fig 46 Adjust the rod 7 Fig 46 with the aid of the needle bar support 4 so that the needle is in the center of the needle plate hole Tighten firmly screw 29 Check the distance between needle and shuttle see chapter Tim ing of Shuttle and Needle Bar 58 Copyright 2004 MINOR ADJUSTMENTS IN THE UPPER GROUP OF THE ZIG ZAG MECHANISM When the needle positioning lever no A85662 is in the center notch and the zig zag stitch lever handle No 85620 is set at O namely at the extreme left after the cams have been removed from the machine the needle must be in the center of the hole of the zig zag stitch needle plate If the needle is not in the center of the hole make the a
30. a small brush Fig 7 Clean also underside of needle plate around vicinity of feed dog Lift latch of bobbin case with thumb and forefinger of left hand Fig 8 and remove bobbin case by pulling it toward the left and out of the machine Snap out pins Z Fig 9 by swinging them sideways and with left hand remove the race cover plate T by turning it away From the race g Remove shuttle hook R by gripping its center stud with thumb and forefinger of left hand and pulling it to the left and out of the Machine This leaves the shuttle race free for cleaning h Remove lint and pieces of thread with a piece of rag or brush With a small brush Put a drop of oil into the race and oil rim only Of shuttle hook i To replace shuttle hook insert it into the race with thumb and Forefinger of left hand fitting it into place opposite the shuttle Fig 7 Carrier without using force Fig 10 k Place the race cover plate T onto the two small studs G 14 Copyright 2004 il ay WAY 15 Copyright 2004 Fig 10 and snap pins Z back into place Fig 9 Insert bobbin case replace needle plate as shown in Figs 5 and 6 and lower the machine to its working position Adjusting the thread tensions The tensions of upper and lower thread are correctly balanced if both threads interlock in the center of the fabric as shown in Fig 12 If the tension of the upper thread is too strong i
31. ace the normal needle of the needle bar with the false one of the gauge The false needle is inserted in the same way as a nor mal one Remove the shuttle race cover plate No 26333 and the shuttle No 26327 Insert the shuttle shaped gauge into the shuttle race Fig 18 22 Copyright 2004 False needle Fig 18 23 Copyright 2004 Timing procedure a Bring the needle bar to its lowest position In this position the lower end of false needle should be just in line with the lower edge L of the prong of this gauge as shown in Figs 19 and 20 If an adjustment of the height of the needle bar is necessary loosen slightly screw No 4 Fig 17 so that the needle bar is still held in position by friction Then without turning the balance bas ah T i i Br iF binn ia aa HEUCHT maje tera False needle Fig 20 wheel move the needle bar up or down by hand until the condi tion shown in Figs 19 and 20 is met Tighten screw No 24 firmly Adjustment Position of the needle eye in relation to the shuttle The needle bar must be lined up in such a way that the center line of the needle eye is perpendicular to the shuttle Fig 21 i e the needle eye must not be lined up obliquely in relation to the shuttle Fig 21a The correct alignment of the needle causes the loop of the thread to be arranged in such a way that it can be easily caught by 24 Copyright 2004 Headlo ope Piw ul _ Po
32. anism cover plate and open the face plate of the machine Remove the needle positioning rod 7 Fig 46 in the following order Remove retaining ring 8 Loosen screw 6 which holds left end of the rod 7 Remove pin 5 by pulling it upward Loosen screw 29 at right hand end of rod 7 Remove the needle bar positioning rod 7 by pulling it out of the machine from the face plate side The needle bar positioning lever assembly 13 is now free for removal which shall be done in the following order see Fig 46 Loosen screw 33 which holds the pin 34 underneath the bed plate Remove spring 10 from the left side Remove retaining ring 11A which is slipped on top of pin 15 Remove the needle bar positioning lever 12 by pulling it backward and then upward out of the machine Remove spring 30 toward the right Loosen screw 25 and remove zig zag width regulating lever 32 51 Copyright 2004 g Remove the feed lifting connecting rod No A 26345 from the machine To remove the nuts use the special tool 20 1 Shift the eccentric No 20026 towards the left until it rests on the gear Turn the needle bar positioning lever assembly 13 toward the back and the lever assembly for zig zag width control 17 completely to the right In this manner the small stud in the link 35 of the vertical shaft 31 can be taken out of the lower groove of needle bar positioning lever a
33. between the thinner and the thicker portion of the Gauge are of different sizes 0 028 and 0 035 respectively First place the gauge on the needle plate in such a way that the thinner step a is down over the feed dog teeth and turn the balance by hand wheel by a full rotation The feed dog must then come in touch with the gauge and move it Turn over the gauge so that larger step b is resting over the feed dog When turning the balance wheel the teeth of the feed dog must not contact the gauge the gauge is not moved 64 Copyright 2004 Note It is necessary to check if both conditions 1 and 2 are met If not adjust the feed dog following this procedure Fig 56 Loosen screw No 1 Fig 55 and adjvist the crank No 2 as require ed tighten the screw No 1 firmly Check again if both conditions 1 and 2 are met If not keep on adjusting crank No 2 until they are 65 Copyright 2004 Alignment of feed dog in relation to the slots in the needle plate It is necessary to check whether the rows C of the feed dog Fig 57 are parallel with and at the same distance from the edges of the slots in needle plate D The motion of the feed dog in the needle plate slots must be unit form namely the distance a Fig 58 when the feed dog starts its horizontal movement in the slot must be the same as the di stance b Fig 59 when the feed dog has completed its hori zontal movement in the slot Th
34. bin case is placed on the post inside the oscillating shuttle and then pressed into the oscillating shuttle The oscillating shuttle after its point has entered the loop of the needle thread makes a partial revolution just sufficient to carry the enlarged loop of the needle thread over and around the bobbin case and then lets it slide off easily from the oscillating shuttle After the rising thread take up lever has pulled the needle thread away from the oscillating shuttle the shuttle returns to its starting position This oscillating movement of the shuttle is repeated at every stitch To the arm of the machine are also attached the tension mechanism for the needle thread upper tension and the various thread guides which lead the thread from the spool to the needle In the upper portion of the arm the Automatic Device is installed consisting of a mounting plate on which the cam carrying bushing and the other component parts are assembled The Automatic mechanism is driven by a suitable cam mounted on the upper shaft The SUPERNOVA machine is provided with a built in motor inside the arm as well as a transformer which feeds the sewing light at 12 V and the motor at two different voltages giving two different speeds 7 Copyright 2004 Tools and necessary accessories To service and repair any type of sewing machine efficiently the mechanic should have available proper tools and several accessories essential for a good maintenance j
35. clock wise tighten nut A The machine moves forward during the first part of the test and moves backward during the second part of the test However the material moves more during the first part of the test than during the second part of it Solution Loosen nut A turn counter nut B counter clock wise tighten nut A The machine moves forward during the first part of the test and moves backward during the second part of it However the mate rial moves more during the second part of the test than during the first part of it Solution Loosen nut A turn counter nut B clockwise tighten nut A The adjustments by means of the counter nut B are very sen sitive a very slight turn of the counter nut B therefore is en tirely sufficient Repeat above adjustments if necessary 103 Copyright 2004 ADJUSTMENT OF THE NUMBER OF IMPULSES FOR EACH TURN OF THE CAM AXLE N L Fail p T l gE a i k Fig H9 While the machine is operated the cam axle upon which the cams are placed moves in short impulses The cam axle makes a complete turn of 360 degrees during the completion of one design While making this one revolution of the cam axle a complete cycle of a design is made During this one full turn of the cam axle about 30 36 60 or 150 impulses of the cam axle take place depending on the position of the marks 1 2 3 or 4 on the design graduating knob in re
36. djustment as explained in chapter Im portant adjustments to be made after re assembling the upper group of the zig zag mechanism The machine runs noisily when sewing zig zag with disconnected automatic mechanism The cause of the noise can be located somewhere in the upper group of the zig zag mechanism and it is advisable to check all the connections between the various parts to see whether any undue play sxists Dismantle mechanism and check if and where excessive play exists Especially check the fit of the sector No 26106 and the roller No 26105 If necessary replace the worn out parts with new ones Zig zag sewing is noisy due to excessive play between the gears No 26240 and No C 85664 To adjust proceed as follows loosen screw No 048050 GEB which holds the gear No C 85664 in the arm By means of a screw driver to be inserted in the notch at the upper end of the gear No C 85664 Fig 53 turn slightly the eccentric support of this gear clockwise the gear No C 85664 will then get closer to the gear No 26240 and the play between the two gears will thus be reduced Tighten the screw No 048050 GEB firmlv after this adjustment 59 Copyright 2004 5 pn MN 048050GEB 26240 Fig 53 If after having turned the eccentric support of the gear No C85664 clockwise as far as it will go there is still too much play between the two gears replace the worn out gears with new ones The machine is s
37. e and with the parts catalogue for this machine The maintenance of the SUPERNOVA Sewing Machine requires no special skill or Knowledge All that is needed is a certain mechanical aptitude and the availability of the necessary tools This manual is intended only for those mechanics that make routine repairs and replace single defective parts Major repairs should not be carried out by persons of limited experience Therefore if major repairs are required it is suggested that the complete head be returned to the distributor after prior authorization has been received from that distributor The SUPERNOVA Sewing Machine like practically all sewing ma chines designed for household use works on the principle of the Lockstitch This type of stitch is obtained by interlocking the upper and lower thread inside the fabric while the needle going down to its lowest position penetrates the fabric and rises again to its highest position The two threads of the seam are thus tightly interlocked at every stitch adhere closely to the fabric and hold the plies of the fabric firmly together If either of the two threads breaks or if the threads are cut off after the sewing operation is completed the seam will not unravel but only two or three stitches may get loose and open up The illustrations Figures a to d indicate the formation of a single lockstitch and the interlocking of both threads in the fabric All machines consist of two major portions
38. echanism mounting plate Insert pin B of gauge 10 7 Fig 39 into the timing hole on eccentric A 85241 Turn the flywheel G slowly until the base of the gauge rests on the two side rims of the machine Fig 40 If the timing is correct needle bar E should now be at its highest position and the connecting link H should be in a straight vertical position If the above requirements are not met loosen the screw No 85279 of the eccentric No A 85241 use Allen wrench 20 5 and while gauge 10 7 is kept against the surface of the machine arm and the pin B remains inserted in the timing hole of the eccentric turn the flywheel G slowly until the needle bar E reaches its highest position Then tighten the screw No 85279 firmly 45 Copyright 2004 Timing of the zig zag movement and the movement of the needle bar Remove the mounting plate for the Automatic device Remove the zig zag mechanism cover plate No 85621 Replace the zig zag mechanism cover plate with gauge 10 4 Fig 43 Set the machine for straight sewing by moving the needle positioning lever to the center of the gauge and the zig zag width to zero completely to the left Fig 40 Turn the balance wheel slowly toward you until the needle bar has reached its highest position and the needle bar connecting link D 26020 is in a vertical position Fig 45 With the needle bar in this position the eccentric A of the vertical gear No C 8566
39. eedle bar positioning rod 7 Fig 46 from the face plate side of the machine and insert its right hand end into the hole of the block 27 Connect this rod 7 witha needle 56 Copyright 2004 ube STARE Saye be eee a iowa Fig 52 bar support 4 by means of the pin 5 and the retaining washer 8 Tighten screw 6 which holds pin 5 in the needle bar support 4 Tighten temporarily screw 29 which holds the right hand end of rod 7 in the block 27 The correct position of the rod 7 must be adjusted in accordance with the instructions in chapter Important Adjustments in Upper Group of Zig Zag Mechanism Section 2 Insert handle 32 into lever assembly 20 Fig 46 and secure it by firmly tightening screw 25 p Replace connecting rod 40 Fig 46 underneath the bed plate and adjust the position of the needle in relation to the needle plate by means of the needle bar positioning rod 7 see Section 2 of Important Adjustments in Upper Group of Zig Zag Mechanism q Replace the zig zag mechanism cover plate No 85621 and tighten its two fastening screws r Replace the feed eccentric connecting rod No D 85506 as explained in section Reassembling Feed Eccentric Connecting Rod and Stitch Length Rod 57 Copyright 2004 After having replaced this lever check again the timing of the movement of the feed dog see section Timing of Feed Dog and Needle Bar
40. ength of the stitch as set on the stitch length regulating knob It is advisable to check the looseness in the following parts pointed bearing pins for feed rock shaft No 20100 pointed bearing screw No 44 for feed dog support No 20121 Screws No 58 at the ends of the connecting rods No D 85506 and No A 26345 stitch length regulating rod see instruction re Assembling of feed eccentric connecting rod No D 85506 and of the stitch length regulating rods 2 Adjusting the height of teeth of the feed dog above the needle plate General Rules Turn the balance wheel by hand toward you and check the maximum height of the teeth of the feed dog above the needle plate When the feed dog is in its highest position its teeth must protrude about 1 32 above the needle plate 63 Copyright 2004 If necessary adjust the feed dog as follows Fig 55 loosen screw No 1 that fastens the crank No 2 to the feed lifting shaft No 3 a adjust crank No 2 until feed dog teeth are in the right position as described above tighten screw No 1 firmly For making this adjustment the gauge No 10 1 can be used by following this procedure Fig 56 Remove the presser foot and the needle place Gauge No 10 1 on the needle plate in such a way that the thinner portion is over 035150 GAN Fig 55 the teeth of the feed dog while the thicker portion rests on the needle plate as shown in Fig 56 The two steps a and b
41. et for straight sewing the cams have been removed and the zig zag stitch lever is set at O but still sews zig zag This may be due to two reasons namely Fig 54 The zig zag stitch lever D 85611 drawn back by spring A does not contact the eccentric No 85663 of the lever No C 85641 The lever No C 85641 is not in its right position In the case a proceed as follows Fig 54 Test the strength of spring A Check whether the sector No 26106 is sliding freely in the lower channel of the oscillating lever No A 85606 Check whether the lever No D 85611 is moving freely around its pivot No 85693 60 Copyright 2004 035040F G 85663 C85641 5 6 6 93 85620 A85606 Fig 54 In the ep case b proceed as follows Fig 54 Sy tar a if Mh Slightly loosen the ee a screw No a ee 035040 FG which 26106 _ x a holds the 085611 om ee eccentric No 85663 a re to the lever No C By iii means of a screw driver inserted into the notch of ec ts centric No 85663 turn the 7 eccentric itself slightly as re quired until the machine sews straight Note The zig zag lever No D 85611 must be in contact with the eccentric No 85663 Firmly tighten screw No 035040 FG 61 Copyright 2004 THE FEED DOG The purpose of this part is to feed the fabric regularly for a certain distance at every stitch so that the space between one perforation of the fabric by the needle and t
42. fork M must then be in slight contact with the pin N Fig 84 Lever No D A 26 3 25 into working position namely move it completely to the right so that it is very close to the arm of the machine see Fig 85 Loosen slightly the I screw No 025040 i FDB see Fig 85 which holds the small plate No D A 26 1 24 as shown in Fig 85 With one hand press the stud D Fig 83 which is firmly inserted in the small plate No D A 26 1 24 as indicated in Fig 85 slightly against the contact finger No A 26 1 23 so that the point of the curved portion of this finger is touching the gauge No 10 2 while the other hand working in the opposite way pres ses the head of the screw No 025040 FDB until a positive resist ance is obtained 98 Copyright 2004 A2 6 1 13 p A26 1 24 D A 26 3 25 025040 FDB A 26 1 23 025040 FDB 85 Tighten without moving these parts the screw 025040 FDB the small plate p a26 1 7 26 1 24 Loosen the screw No 025040 FDB which holds the small plate D A 26 1 7 as indicated in Fig 85 Repeat for this plate for the contact finger the same adjustments as explained above under 3 and 4 99 Copyright 2004 ADJUSTMENT OF THE FEED REGULATING ROD WHICH REGULATES THE AUTOMATIC LENGTH OF THE STITCH NO A 26 3 21 This adjustment and the one explained previously pertaining to the contact fingers No A 26 1 13 and No A 26 1 23 are very
43. ghtly tighten the two screws 8 which hold the collar 9 on the shaft A 13 Place two thicknesses of material under the presser foot and lower the presser foot Leave the stitch length regulating knob at zero 0 let the machine ne run and check whether the material under the presser foot is moving If the material is not moving firmly tighten the two screw 8 In collar 9 on the shaft A 13 If the material moves proceed as follows Slightly loosen so that there is still some friction the two screws 8 inthe collar 9 If the material under the presser foot moves backward push the shaft in its axial direction toward the rear wall being care full not to turn the shaft If the material moves forward push the shaft in its axial direction toward the front wall Repeat this procedure if necessary until the material does not move at position 0 zero of the stitch length regulating knob Securely tighten the two screws 8 in collar 9 of shaft 13 To make sure that the shaft A 13 did not turn during this adjust ment try to press the reverse push button which must not move at all If the button moves repeat adjustment 3 39 Copyright 2004 The timing of this regulating shaft A 13 can also be performed with the aid of the gauge 10 6 Using timing gauge 10 6 Remove the automatic mechanism mounting plate and the right hand cover 20026 D85506 Fig 36 40 Copyright 2004 Remove top cover
44. ghtly toward the plus sign see Fig 90 Fig Fig 91 90 Now tighten screws A and B d Check again the number of impulses as explained previously und er 105 Copyright 2004 If the number of impulses is still under 135 repeat the adjustments A B C and D If the number of impulses is more than 170 for each turn of the cam axle proceed as explained in the second test If the number of impulses which the cam axle makes during one full turn of 360 degrees is more than 165 correct as follows Turn the balance wheel by hand and bring the thread take up lev er to its highest position set the design graduating knob at 4 see Fig 89 Shift the cam connecting lever No D A 26 3 25 to its working position toward the arm of the machine so that the screws A B are fully visible Figs 89 90 and 91 Loosen slightly screw A and loosen also very slightly screw B Move the graduation pointer C slightly toward the minus sign Fig 91 Now tighten screws A and B Check again the number of impulses of the cam axle during one turn of same as previously explained under 2 If necessary repeat adjustments A B C and D The adjustment of the graduation pointer C is very sensitive therefore very slight changes of its position are required Horn to count the number of impulses of the cam axle The following instructions will help you to facilitate this procedure Place t
45. he washer should move check its position again and rectify it if necessary A 26 3 15 Round side of the pulling drum No C A26 3 6 End of spring No A 26 1 11 Flat portion 0 of drum No C A26 3 6 26 3 11 035080FDB Fig 95 Place the upper pulling drum No C A26 3 6 which acts as a cover over the already assembled group so that the flat por tion O of this drum see Fig 95 will rest lightly without force against the spring No A26 1 11 Tighten the spring No A26 1 11 to the drum No C A26 3 6 by means of the small plate No A26 3 11 and the two screws No 035080FDB see Fig 95 Tighten these two screws thoroughly NOTE If the two brake shoes Fig 94 are assembled correct ly the two holes A of the brake shoe No A26 3 4 and of 111 Copyright 2004 T Lal ET e a oo oe A pt Fig D8 A26J3 9 The washer No A26 3 9 are seen above each other through the oblong hole B of the upper pulling drum No C A26 3 6 as indicated in Fig 97 If the thin washer No A26 3 9 should have moved push it with a pin into a direction so that the two aforementioned holes are just above each other Place the movement regulating ring No A26 3 15 see Figs 93 and 95 over the upper pulling drum No C A26 3 6 center it perfectly and locate it so that the stop C Fig 93 which is attached underneath the movement regulating ring No A26 3 15 is positioned within the opening D of the upper
46. he cam 0 zero cam or the gauge cam No 10 2 on the cam axle instead of the regular cams With a pencil mark a short line on the zero cam or the gauge cam No 10 2 and then mark another short line on the mounting plate of the Automatic device see Fig 92 106 Copyright 2004 Fig 92 Turn the balance wheel by hand and count one by one the number of impulses made by the cam axle Stop the machine when the cam axle has made a full turn of 360 degrees when the mark on the gauge cam No 10 2 is again in line with the mark on the mounting plate for the Automatic Instead of turning the balance wheel by hand the machine may also be run with the aid of the motor In this case however one hand should be placed on the balance wheel to slow down the machine in order to distinguish and to count the number of impulses 107 Copyright 2004 ASSEMBLING THE PARTS UNDERNEATH THE MOUNTING PLATE NO C A26 1 1 OF THE AUTOMATIC DEVICE FIG 93 400090BZ C A26 3li A 26 3 14 A26 3 C A C A26 1 1 26 3 6 A26 3 i8 108 Copyright 2004 035080 26 3 12 FOBA Fig 93 Fig 93 shows how the various parts of the Automatic Device have to be assembled In the following are indicated a few steps on how to assemble each single group 109 Copyright 2004 Preparation of assembling the group as shown in Fig 94 Place the two brake shoes No A26 3 4 inside of the lower pulling drums No C A26 3 l shown in Fig 93
47. he gauge How to remove the gauge 10 9 Rotate the balance wheel slightly just enough to bring the lower end of the bar E out of the hole in the gauge Remove the gauge No 10 9 from the shuttle race Remove the bar E Reassemble the machine 30 Copyright 2004 Important Adjustment of the Shuttle Carrier Shaft in the SUPERNOVA In the NECCHI SUPERNOVA machines the oscillating crank shaft No D 26306 is pinned to the carrier shaft No C 26325 Fig 28 In these machines therefore the angular position of the shuttle carrier at one end of the carrier shaft in relation to the oscillating crank shaft D 26306 at the other end of this shaft remains always the same If in these machines it should be necessary to replace the old carrier shaft No C 26325 with a new one the shuttle carrier and the oscillating crank shaft No D 26306 must be placed in the proper angular position in relation to each other Proceed as follows Place the carrier shaft No C 26325 Fig 28 on the machine Place the oscillating crank shaft No D 26306 on the other end of carrier shaft in such a position that carrier shaft No C 26325 and oscillating crank shaft include an angle of about 90 degrees as i F 40 C2632S Q480SO0GEB Fig 28 0090 BZ 31 Copyright 2004 FLER a O25 706 Pig 29 indicated in Fig 29 This angular position is approximately cor rect but in must be checked see item 2 below Now tighten firmly
48. he next one equals the desired length of stitch A perfect feeding operation is of great importance for the final result of sewing An incorrectly operating feed dog will cause irregular feeding of the fabric unequal length of the stitches and a seam which is not straight There are many circumstances which may cause the defects just mentioned Before further investigating the causes of incorrect feeding it is necessary to make certain that the various parts of the feeding mechanism are properly assembled see instruction for Timing of Feed Dog and Needle Bar Here are some adjustments of other parts of the feeding mechanism Adjustment of any looseness in this mechanism Adjusting the height of the teeth above the needle plate Alignment of the feed dog in relation to the feed dog slots and the needle plate Alignment of the underside of the presser foot in relation to the teeth of the feed dog this adjustment is very important for the straight feeding of the fabric 62 Copyright 2004 Adjustment of any looseness in the feeding mechanism Excessive looseness of parts that are connected with the feeding mechanism such as the feed shaft the feed dog support and the feed eccentric connecting rod can be ascertained by setting the stitch length regulating lever for very short stitches In this case the movements of the parts are offset by the variety of play and the feeding of the fabric will not be in accordance with the l
49. hile for the type of fabric in work the tension of the lower thread must be kept constant the pressure of the presser bar spring and the tension of the upper thread must be changed in accordance with the thickness of the type of fabric Positioning of presser bar and presser foot The opening in the presser foot hole or slot which permits the passage of the needle must be adjusted so that it is exactly above the outspending opening in the needle plate Fig 62 Should the presser foot not be positioned correctly proceed as follows Slightly loosen the presser bar screw No 048050 GEB in the pres ser bar guide No 85318 see Fig 61 Turn the presser foot until it is in the correct position on the needle plate 71 Copyright 2004 Fig 62 Tighten the aforementioned screw firmly first making sure that the presser bar guide No 85318 has not shifted upward or downward from its original position since this would bring with it a change of the pressure and the vertical position of the presser foot Height of presser foot osition in vertical direction The presser bar lever No 20095 see Fig 63 permits three different positions of the presser foot The presser bar lever is entirely down In this instance the presser foot rests firmly upon the needle plate or upon the feed dog and there is some space a between the presser bar lever and the presser bar guide above Fig 63 72 Copyright 2004 Fig 64 ie Se
50. important in order to obtain perfect fancy stitching and especially the Greek Key Stitch and the automatically made buttonholes Before making the following adjustments it should be made certain that the machine is perfectly assembled and especially that the timing of the stitch length regulating shaft is correct see chapter Timing of the Regulating Shaft and Adjustment of the Feed Dog Proceed now as follows Place gauge No 10 2 on the cam axle Fig 86 Move zig zag width lever completely to the left D A26 3 25 D A26 1 14 A A26 3 2i Fig 86 100 Copyright 2004 The needle positioning lever may be in any one of the three po sitions Bring the cam connecting lever No D A 26 3 25 in working po sition namely moves it entirely to the right toward the arm of the machine Fig 86 Move the design graduating knob to 1 Set the stitch length graduating knob at 4 Place two thicknesses of material under the presser foot and lower the presser foot entirely The machine must remain in this position during the entire following adjustment This adjustment is divided into two parts 1st Part Run the machine without thread The material under the presser foot should move forward but with a very slow almost imperceptible motion 2nd Part In addition to the use of Gauge 10 2 the distance blade should be placed between Gauge 10 2 and the feed contact finger No D A 26 1 14 as indicated in Fig 87
51. ing E Fig 66 serves two purposes namely To take up and hold the slack of the upper thread given free by the descending thread take up lever No D 20033 until the eye of the descending needle has entered the fabric To release gently the thread which during the finishing phase of the stitch was required for the stitch formation and to permit the thread take up lever to close the stitch without tearing the fabric 75 Copyright 2004 When released the check spring must occupy the position as shown in Fig 67 namely when the presser foot is resting on the needle plate the vertical distance between the loop of the check spring E and the lever edge of thread guide A must be about 23 64 If this distance is larger or smaller adjust as follows 048050 GEA Fig 67 Open the face plate Loosen screw No 048050 GEB see Fig 67 which holds the tension mechanism to the machine arm Turn the whole tension mechanism until the check spring rea ches its correct position In turning the tension mechanism take care so as not to displace it sideways Fasten the tension mechanism in its new position by tightening screw No 048050 GEB firmly 76 Copyright 2004 Positioning of the tension mechanism in relation to the hole in the arm It is very important_to check whether the position of the tension me chanism in relation to the hole in the machine arm is correct Here is the procedure to follow for this adjustmen
52. ing are explained the most important timing procedures omitting operations which are solely performed on the assembly line in the factory where the machines are made For each timing procedure is also mentioned the corresponding timing gauge which should be part of the mechanic s equipment Furthermore whenever possible a general rule for the timing procedure in question is given in case the corresponding timing gauge should not be available to the mechanic Timing performed in accordance with the rules set down in the following chapters is indispensable when One or several elements of a group of parts have been replaced whose actions depend on those of another group of parts or when entire groups of parts depending on each other must be removed and replaced It is necessary to check the proper function of a group of parts in relation to another group of parts the movements of these groups depending on each other Certain disturbances must be eliminated which interfere with the proper progress of sewing The following five interdependent adjustments are essential The timing of the movements of shuttle and needle bar The timing of the movements of feed dog and needle bar 20 Copyright 2004 The timing of the movements of the zig zag mechanism and the needle bar The timing of the Stitch Regulating Worm The timing of the eccentric for the Automatic Note All these timings have been done and thoroughly checked
53. int of shuttle Fig 21 a Needle eye in correct Needle eye in incorrect position position The point of the shuttle This is especially necessary when the machine sews with two needles In order to obtain the above mentioned condition it is necessary that the needle bar clamp No D 26295 Fig 22 be firmly tightened and that axis a of the needle clamp No D 26295 be directed parallel to axis b of the upper shaft No C 85201 Fig 22 or what amounts to the same thing that the axis a of the needle bar clamp No D 26295 is in the direction of the longitudinal axis of the machine If it is necessary to make an adjustment proceed as follows Loosen slightly screw No 24o0fthe needle bar connecting stud No 26025 Fig 17 Without moving it up or down rotate the needle bar about its own axis in the required direction until it is in the position shown in Fig 22 Tighten screw No 24 firmly HI Adjustment Distance between the needle and the shuttle Without touching the needle thg point of the shuttle should be Copyright 2004 C85201 Fig 22 Fig 23 is too far away from the needle loosen the screw F Fig 24 below the bed of the machine Then move the race body No D 26330 with the carrier shaft No C 26325 in axial direction until the shuttle comes as close as possible to the needle without touching it Before tightening the screw F adjustment IV should be checked 26 Copyright 2004 D2
54. ion Tim ing of shuttle and needle bar page 13 Now sew with the machine a If the machine sews correctly Place a sharply pointed pin into the tapered pin hole of the oscillating crank shaft and mark on the carrier shaft the position of the hole to be drilled and reamed in the carrier shaft Remove the carrier shaft assembly then drill and ream the tapered pin hole in the carrier shaft Next assemble with machine using the ta t Point of Center of needle shuttle or Pointof shuttle or hook hook Movement gt Moveme J Ca AO Lowest nt position of the needle Needle Fig 30 Needle eye 33 Copyright 2004 Fig sI False needle pered pins No 300160 SA For reaming tapered holes use tapered reamer N 3 0 After this operation it is advisable to again perform the adjustments II III IV of the section Timing of shuttle and needle bar If the machine does not sew properly repeat operation No 2 until the machine performs perfect sewing Then drill ream and pin as explained in paragraph 4 a Timing of feed dog and needle bar General Rules The feed dog must be adjusted in such a manner that it starts to move away from the operator at about the time the needle begins its downward movement from its highest position The feed dog must have finished its forward feeding motion at the time the point of the descending needle is about to enter the fabric The feed dog must not move the fabric while the
55. is test can be made by setting the stitch regulating knob for the maximum stitch length both for ward and reverse Adjustment A Two cases may occur 1st Case The rows C of the feed dog Fig 57 are parallel with the edges of the needle plate slots but the distances a and b are not the Fig 57 same To adjust proceed as follows loosen screws E Fig 60 that fasten the two pointed bearing pins F of the feed rock shaft G as well as the screw H that fastens the crank L By hitting slightly with a soft hammer on the pins F displace the shaft 66 Copyright 2004 The feed dog has completed its The feed dog starts its horizontal horizontal movement in the slot of movement in the slot of the needle the needle plate Fig 59 Fig 58 G until the rows of the feed dog are in the right position namely at the same distance from both edges of the slot Tighten screws E firmly making certain that no looseness exists between the pointed pins F and the feed rock shaft G Before tightening the screw H check adjustment B as explained later on 2nd Case The rows C of the feed dog Fig 57 are not parallel with the edges of the needle plate slots To adjust proceed as follows remove needle plate as shown in Fig 5 and slightly loosen the screws M Fig 60 which fasten the feed dog to its support Then align the feed dog C as required and set it in the correct position
56. lation to the mark on the machine arm above this knob The adjustment of the number of impulses is made at the factory and any readjustment is not necessary even if the machine is dismantled or reassembled again It is only when the following parts must be replaced with new ones that the number of impulses may change and a recheck of the machine may be required spring No A 26 1 11 pulling drum No C A 26 3 6 spring sliding plate No A 26 3 17 movement regulating ring No D A 26 3 15 The number of impulses which the cam axle completes during one turn of 360 degrees must then be checked again by following this procedure 104 Copyright 2004 Set the design graduating knob at 4 Turn the balance wheel by hand or let the machine run very slowly holding the balance wheel back and count the number of impulses which the cam axle receives during one full turn of 360 degrees If the number of impulses is between 135 and 165 the adjustment is correct If the number of impulses is under 135 correct as follows Turn the balance wheel by hand and bring the thread take up lever to its highest position set the design graduating knob at 4 see Fig 89 Pull the cam connecting lever No D A 26 3 25 to its working position toward the arm of the machine so that the screws A and B are fully visible see Figs 89 90 and 91 Loosen slightly screw A and also loosen very slightly B move the graduation pointer C sli
57. lignment of Feed Dog in relation to the slots in the Needle Plate 58 How to check the alignment between the underside of the presser foot and the teeth of the feed dog 60 5 Minor adjustments of the Feed Dog 62 HOW TO CONTROL THE PRESSURE OF THE PRESSER FOOT 62 Positioning of presser bar and presser foot 63 Height of Presser Foot 64 UPPER THREAD TENSION 66 The Thread Take Up Spring Check Spring of the Upper Tension 67 Positioning of the Tension Mechanism in relation to the Hole in the Arm 69 Tension of the lower Thread tension of the Bobbin Case 70 THE OSCILLATING SHUTTLE 71 TO REMOVE THE FEED ECCENTRIC CONNECTING ROD N D 85506 AND THE CONNECTING RODS OF THE STITCH LENGTH REGULATION MECHANISM Figs 74 and 75 74 3 Copyright 2004 Pages HOW TO REMOVE THE STITCH LENGTH REGULATING KNOB AND THE REGULATING SHAFT Fig 75 76 HOW TO REASSEMBLE THE STITCH LENGTH REGULATING KNOB AND THE REGULATING SHAFT 76 HOW TO REASSEMBLE THE FEED ECCENTRIC ROD N D 85506 AND THE CONNECTING RODS OF THE STITCH LENGTH REGULATING MECHANISM Fig 74 and 75 79 General Rules with Reference to important Adjustments of Stitch Length Regulating Knob and Regulating Shaft 80 Adjustment of the Friction of the Stitch Length Re gulating Knob 81 3 Zero Position of the Stitch Length Regulating Knob 82 ADJUSTMENT OF THE FEED DOG DISENGAGING ME CHANISM See figs 79 and 80 83 ADJUSTMENT OF THE ECCENTRIC N
58. line with the mark above this knob Turn the balance wheel for one full turn toward you Turn the design regulating knob clockwise again until the triangle sign and the mark above the knob are in line Stop The Automatic is now completely disconnected 12 Copyright 2004 Changing from automatic sewing to straight sewing Disconnect the Automatic as already explained on page 4 Remove the cams from the machine by proceeding as follows Swing the Cam Disengaging Lever at the rear of the arm entirely to the left as far as it will go Open the small cover on top of the arm and take out the cams Close small cover again Swing back the Cam Disengaging Lever entirely to the right as far as it will go The machine is now ready for straight sewing Fig 5 Fig 6 Cleaning of shuttle race and feed dog Bring the needle up to its highest position by turning the balance Wheel toward you Move slide plate to extreme left h Tilt the machine back on its hinges so that the underside is in Full view c Rotate the needle plate release lever Fig 6 in the direction of Arrow C until the center stud in the needle plate becomes free Then remove the needle plate 13 Copyright 2004 Note To fasten the needle plate after having placed it in its re ceptacle push the lever shown in Fig 6 in the direction of the arrow A and at the same time rotate it in the direction of the arrow B Clean teeth of feed dog with
59. n on the connecting rod No D 85506 slips onto the lower stud in the stitch regulator lever 4 No D 85513 Push the feed eccentric No 20026 further until the connecting rod 1 rests against both the connecting rod No D 85506 and the lever 4 The connecting rod 1 must be posi tioned so that it is not bent and does not leave any play side ways Tighten the two screws No 048080 GEB in the feed eccentric No 20026 to fasten it to the upper shaft Connect the lower end of the feed eccentric connecting rod No D 85506 with its component parts below the bed plate of the machine Note After the assembly of the feed eccentric connecting rod No D 85506 it is necessary to check the timing of the feed dog as explained in Chapter Timing of Feed Dog and Needle Bar Assemble the feed lifting connecting rod No A 26345 in the machine Connect the spring 3 see Fig 75 with the lever 4 1 General rules with reference to important adjustment of stitch length regulating knob and regulating shaft Take out the cams turn stitch length regulating knob at zero turn knob counter clockwise until it stops then check the following points The zero O mark of the graduations on the stitch length regu lating Knob must coincide with the square mark on the arm above the knob 88 Copyright 2004 The reverse sewing button R when pressed must not move at all Two thicknesses of regular sewing material when placed unde
60. n relation to that of the lower thread the lower thread will be pulled up to the top surface of the fabric and appear there in the form of small knots or loops see Fig 13 16 Copyright 2004 17 Copyright 2004 To correct this condition make certain that the presser foot is down then turn Tension Regulating Knob to the left If tension of needle thread is too loose or tension of bobbin thread is too tight bobbin thread will lie straight along underside of fabric and needle thread will be pulled down to underside being visible there in the form of loops or small knots Fig 14 To correct this condition make certain that the presser foot is down then turn Regulating Knob to the right Make several stitches to check whether needle thread tension is correct and if necessary adjust further by turning Regulating Knob Fig 14 Cleaning To clean the machine prepare a mixture of 90 kerosene and 10 lubrication oil Fill an oil can with the cleaning fluid and also pour a sufficient quantity of this liquid into a pan If the machine due do dirt and gummed oil runs heavily force with the oil can plenty of the cleaning fluid into all oil holes and on to all movable parts Then run the machine at high speed until all dirt and hardened oil is washed out Should some parts of the various mechanisms of the machine have become badly clogged with dirt and gummed oil remove these parts from the machine and place them fo
61. ng operation DO NOT turn the machine 29 Copyright 2004 Insert the gauge No 10 9 into the race body and attach it by means of the two knobs H and the two locating pins G Timing procedure If by pushing down the needle bar by hand while the balance wheel Is held firmly the lower end of the bar E enters exactly into the Rectangular hole in the prong of the gauge No 10 9 Fig 27 then the requirements of paragraphs Il Ill and IV have been satisfied In Order to comply also with the requirements of paragraph l push the Step I of the bar E further downward until it stops against the Outside of the gauge No 10 9 Fig 27 Now tighten screw No 24 and remove the gauge If by pushing down the needle bar by hand the lower end of the Bar E does not enter the rectangular hole in the prong of the Gauge No 10 9 and then adjust as follows Loosen the screw F below the bed of the machine Fig 24 in order to allow the race body No D 26330 to be moved freely Move the race body No D 26330 and the needle bar C stimuli tenuously until the lower end of the bar E enters the rectangu lar hole in the prong of the gauge Push down the step of the bar E by hand Fig 27 until it stops against the outside of the gauge Firmly tighten the screw No 24 of the needle bar connecting stud No 26025 Firmly tighten the screw F Fig 24 below the bed of the machine Remove t
62. ob He must know how to operate the machine and be familiar with the various mechanisms of the machine and the manner in which they are adjusted timed Finally he must be scrupulous about cleaning the machine and oiling all the parts which require lubrication For the mechanics we have available a tool kit containing all wrenches screw drivers and gauges for any repair and timing of the SUPERNOVA machine Suggestions for the mechanics After a short examination of the machine a good mechanic will be able to state with certainty whether the machine sews correctly or not and consequently whether repairs are required Many times a customer calls in a mechanic to have a machine repaired which supposedly is out of order Quite often the customer attributes the poor performance of the machine to imaginary defects of some of the sewing machine parts while in reality the trouble lies in the customer s own lack of experience in using the machine There are four fundamental questions every mechanic should ask in investigating the customer s knowledge with regard to the machine Does the customer know what type and size of needle to use and how to insert the needle in the machine Does the customer know how to thread the machine correctly Does the customer know how to clean the shuttle race Does the customer know how to judge the tensions of upper and lower thread and how to adjust these tensions if necessary 8 Copyright 2004 INSTRUCTI
63. ome rough due to rust or corrosion Moreover it is also essential to check whether the inclined portion P of the shuttle needle guard see Fig 73 has been damaged nicked by a bent needle Should this have happened it will be necessary to repair this damaged portion by smoothing it with fine emery cloth and polishing it with crocus cloth or on a buffing wheel afterwards Fig 73 The shuttle will work properly after this correction 81 Copyright 2004 TO REMOVE THE FEED ECCENTRIC CONNECTING ROD NO D 85506 AND THE CONNECTING RODS OF THE STITCH LENGTH REGULATING MECHANISM FIGS 74 AND 75 20026 D85506 Fig 74 Dismantle and remove from the machine the feed lifting con necting rod No A 26345 to loosen the nut at the end of this rod use the special wrench No 20 1 Dismantle the feed eccentric connecting rod No D 85506 see parts list following this procedure 82 Copyright 2004 C 5 7 6 2 Fig 75 Unscrew fully the conical screw No 58 at the lower end of this connecting rod Loosen the screws No 048080 GEB that fasten the feed eccen tric No 20026 to the upper shaft Move the eccentric No 20026 together with the connecting rod No D 85506 toward the left along the upper shaft until the connecting rod is disengaged from the stitch length re gulating mechanism and can be taken out from below the machine 83 Copyright 2004 Disconnect spring No 3 at its lower end Figs 74
64. ontrol button on the bushing 6 which is fixed inside the casting of the arm and at the same time insert the reverse stitch control button into its proper hole in the arm from the inside outwards Proceed as follows first insert the reverse stitch control button into its hole in the arm and then place the plate 5 on bushing 6 Note The reverse stitch plate must be so positioned that its pin 10 is located between the two thread portions of the regulating shaft as shown in Fig 76 Assemble the stitch length lever 4 see Fig 75 by inserting its pivot C into the bushing 6 which is fixed to the inside of the arm casting Note The stitch length lever 4 must be positioned in relation to the reverse stitch lever 5 as shown in Fig 36 Slip the retaining ring 2 in the groove of pivot C of the stitch length lever 4 Fig 75 Assemble the feed eccentric connecting rod No D 85506 with the stitch regulator connecting rod 1 see Fig 76 in the following manner Place connecting rod 1 No D 85512 on the pivot stud D of the feed eccentric connecting rod No D 85506 Slip the forked portion of connecting rod No D 85506 with connecting rod 1 hanging down on it over the feed eccen tric No 20026 Move the feed eccentric No 20026 together with the connect 87 Copyright 2004 ing rod No D 85506 along the upper shaft until the hole in the lower end of connecting rod 1 hanging dow
65. ough the washer 14 Push this pin down to its middle groove so that the retaining ring 11 B can be slipped into this groove Grip the retaining ring 11B with a pair of tweezers and slip it into the groove of pin 15 See that the washer 14 stays above the retaining ring 11 B Fig 47 55 Copyright 2004 g The bearing bushing E of the lever assembly must be set down on washer 14 and retaining ring 11B without force Adjust the clearance open distance between the underside of the eccentric 22 see Fig 50 and the channel of the lever assembly 13 so that there is a free space of about 0 02 see Fig 51 about 0 02 Fig 51 h Tighten securely screw 2 which holds pin 15 in the hole of the upper arm Fig 50 Place the sector 21 Fig 46 on the short stud in the link 35 of the vertical shaft then let the sector 21 move into the groove underneath the lever assembly 13 Take the needle bar positioning lever 12 Figs 46 and 47 and introduce it between the upper shaft and the rear wall of the machine in such a manner that its handle C passes below the upper shaft and through the front opening of the machine Fig 47 The lever bearing D of this same lever assembly 12 must be slipped over the pin 15 Slip retaining ring 11A into the upper groove of the pin 15 7 Attach spring 10 Fig 52 m Attach spring 30 Fig 52 n Replace the n
66. oughly dry before running it again 120 Copyright 2004 Oiling of motor use only high grade sewing machine oil Apply one or two drops of this oil into each bearing oil hole every two or three months Do not use vegetable oils Before oiling clean lint from oil holes with a pin D Motor runs but does not pull machine Belt slips This will occur if belt between motor pulley and balance wheel is excessively stretched motor pulley is too close to balance wheel motor bracket screws or motor fastening screws are loose there is oil between belt and motor pulley or between belt and balance wheel Replace worn belt adjust motor bracket tighten all motor mounting screws wipe oil thoroughly from belt balance wheel and motor pulley motor pulley too loose on motor shaft Tighten screw in motor pulley Motor is weak Some armature wires are broken Tampering by inexperienced persons may cause this defect Use the same original motor fas tening screws Avoid longer screws Longer screws may damage the wiring in the motor Motor gets too hot Belt between motor pulley and balance wheel is too tight and overloads the motor Shift motor bracket until belt has just enough tension to pull the machine tighten bracket screws Lack of lubrication Lubricate both motor bearings as advised above 121 Copyright 2004 Motor smokes or emits a burning smell Motor is overloaded due to excessive belt tension Adjust belt tension
67. r the presser foot must not move at all when the machine is ope rated In the following are given a few hints to remedy the inconveniences in case the stitch length regulating knob or the regulating shaft are not properly adjusted Zero mark in stitch length regulating knob does not coincide with mark on machine arm see chapter Zero Position of Stitch Length Regulating Knob The reverse sewing button when pressed moves into the machine even if the stitch length regulating knob is at zero see point 1 2 3 and 4 of Timing of the Regulating Shaft Two thicknesses of sewing material when placed under the pres ser foot while the stitch length regulating knob is at zero move when the balance wheel is turned by hand See adjustments under 5 6 and 7 of chapter Timing of Regulating Shaft In case the sti j easily see Chapter Adjustment of the Friction of the Stitch Length Regulating Knob Adjustment of the friction of the stitch length regulating knob If the stitch length regulating knob is too loose the friction between the two spring washers on the center pin of the stitch length regulating knob see Fig 77 between bushing 9 and the arm of the machine must be increased To make this adjustment proceed as follows Remove the right hand cover motor cover No 85152 Loosen the two screws 8 and 10 89 Copyright 2004 Press together stitch length regulating knob 12 and bushing 9 wi
68. r a while in the pan filled with cleaning fluid After the dirt and gummed oil have become loose clean the parts with a small brush dipped in the cleaning fluid Then wipe them dry with a soft clean rag The electric motor must always be kept dry Only the motor shaft requires a few drops of oil from time to time 18 Copyright 2004 Lubrication After the machine has been wiped clean with a rag apply a drop of good oil to every movable part to the bearings of the lower shaft to which the shuttle carrier is attached and to all other shaft bearings of the machine The various oil holes in the machine indicate where the oil must be applied Apply 20 to 30 drops of oil into hole A on top cover Fig 15 Open the small cover and apply one or two drops of oil to the vertical gear indicated at B in Fig 15 Apply also a drop of oil to the point indicated by C in Fig 15 Finally after having taken out the cams apply also one or two drops of oil to the point indicated by E Fig 15 Fig 15 Use only Necchi oil 19 Copyright 2004 ADJUSTING THE MOVEMENTS OF THE VARIOUS GROUPS OF PARTS IN RELATION TO EACH OTHER TIMING THE MACHINE To obtain a continuous and satisfactory performance from the machine the movements of the various groups of parts in relation to each other must be adjusted timed in such a manner that the actions of these parts repeat themselves regularly at certain fixed time intervals In the follow
69. ssembly 13 and this will allow you to remove from the machine the sector No 21 and the roller No 16 Remove retaining ring 11B which is slipped over the pin 15 To simplify this operation use a special pull rod see Fig 47 Loosen screw 2 which holds pin fixed in the arm of the Machine k Take out pin 15 To facilitate its removal take the screw of the presser bar and screw it into the top of pin 15 By Pulling the screw by hand the pin 15 comes out easily 7 Remove the needle bar positioning lever assembly 13 by Lifting it eee the back of the machine 1 15 Fig 47 52 Copyright 2004 Now the lever assembly for zig zag width control 17 is free to be dismantled in the following order Remove the feed eccentric connecting rod No D 85506 see chapter Removing of Feed Eccentric Connecting Rod Turn the fly wheel balance wheel so that the fork of the oscillating rock shaft No 21230 is in its highest position Turn the vertical shaft 31 around its own axle so that the small lever 36 is completely to the right Push link 35 to the back of the arm so that it is almost under the lever 36 Remove eee 37A from pin 38 of the lever Fig 48 Assembly for zig zag width control 17 The pin 38 must not be taken out Remove the lever assembly for zig zag width control 17 and the zig zag width regulating lever 20 53 Copyright 2004 CAUTION
70. t Set the presser bar lever No 20095 in its intermediate position embroidery position as shown in Fig 64 and check whether the following requirements are met The disc opening rod release rod B Fig 68 is as close as possible to disc opening lever N however without touching it The thread take up spring check spring can move freely without rubbing against the machine arm Fig 69 Distance a Fig 69 must be about 1 16 If an adjustment is needed loosen screw No 048050 GEB Fig 69 and move the whole tension mechanism along its axis do not rotate it until the requirements under paragraphs 1 and 2 are met Then tighten screw No 048050 GEB firmly nun i i 04805 0 GEB Fig 68 Fig 69 77 Copyright 2004 D20176 D20172 20179 Lae 20178 o R L 20176 20181 Fig 70 Tension of the lower thread tension of the bobbin case e tension spring No 78 in the bobbin case No 16 see Fig 70 must place the lower thread under maximum tension when the bobbin case tension spring screw No 20179 is completely tightened This tension will gradually decrease when the tension spring screw is loosened The lower thread must always be under some ten sion until the screw No 20179 is completely loosened The tension of the lower thread must remain uniform for any particular position of the adjusting screw No 20179 and must not change while the screw remains in this position Fig
71. t pin 13 into the proper hole in the rear side of the arm Note While assembling the regulating shaft 11 care must be taken that the pivot 10 in the reverse stitching control plate 5 is located between the two thread portions of the regvilating shaft as shown in Fig 76 85 Copyright 2004 Fig 77 Insert the pivot pin of stitch length regulating knob 12 into the hole in the arm so that the end of this pin is protruding slightly inside of the arm casting Slip first onto the pin of the stitch length regulating knob which protrudes inside of the arm the flat washer 16 and then the two spring washers 14 must be positioned as shown in Fig 77 The bushing 9 which was previously on the pin end 13 must now be moved along said pin until its opposite end is slipped onto the protruding pivot pin of the stitch length regulat ing knob 12 The bushing 9 must be positioned as shown in Fig 77 Adjust the friction of the stitch length regulating knob as explain ed in Chapter Adjustment of the friction of the stitch Check the timing of the regulating shaft as explained in Chapter Timing of the regulating shaft for the stitch length regulating knob 86 Copyright 2004 HOW TO REASSEMBLE THE FEED ECCENTRIC ROD NO D 85506 AND THE CONNECTING RODS OF THE STITCH LENGTH REGULATING MECHANISM FIGS 74 AND 75 1 Insert the reverse stitch plate 5 which is connected with the reverse stitch c
72. te a le i RAT en aT ia Eini Fig 63 Fig 65 The presser bar lever is partially raised see Fig 64 This is the intermediate or embroidery position In this position a white triangle in the presser bar lever lines up with a horizontal timing mark on the arm With the lever in this position the presser foot is kept raised just sufficiently high to permit the passage of the embroidery hoop below it while the tension of the upper thread remains unchanged The presser bar lever is raised completely Fig 65 In this instance the presser foot does not rest upon the needle plate or the feed dog and both tension discs are separated from each other the upper thread is under no tension In this position of the presser bar lever the bottom face of the presser foot should be about 9 32 above the needle plate Fig 65 73 Copyright 2004 UPPER THREAD TENSION Correct adjustment of the upper thread tension is imperative for good sewing To function properly the tension discs A B C D see Fig 66 must be kept very clean It is not advisable to clean dirty tension discs quickly by simply drawing a rag between them Sucha procedure may shift the dirt to some hidden spot in the tension mechanism and cause the tension discs to get out of contact with each other This occurrence of course will disturb the tension of the upper thread and make sewing impossible To clean the upper thread tension proceed as follows unscrew
73. th a special pair of pliers see Fig 78 While pressing these parts together tighten the two screws 8 and then two screws 10 which fasten the bushing 9 to the center pin of the stitch length regulating knob After this adjustment it is absolutely necessary to check in accor dance with the general rules in chapter Adjustment of Stitch Length Regulating Knob and Regulating Shaft If the stitch length regulating knob turns too hard it is necessary to reduce the pressure between the two spring washers see Fig 78 Zero Position of the stitch length regulating knob eck whether the zero sign on the stitch length regulating knob coincides exactly with the square mark on the machine arm when the knob is turned completely to the left counter clockwise This position must be correct and is indispensable in order to obtain the maximum stitch length at position 4 of the knob about 5 32 90 Copyright 2004 If the zero sign of the stitch length regulating knob does not reach the mark on the machine arm correct as follows Remove right hand motor cover Disconnect lower end of spring 3 Fig 74 from machine arm to facilitate the adjusting procedure Loosen the two screws 8 which hold the bushing 9 on the pin 13 of the regulating shaft Do not loosen the two screws 10 Turn the stitch length regulating knob counter clockwise until the zero sign coincides with the mark on the arm Tighten
74. the machine Fit the Automatic mounting plate into the machine in such a way that the two forks F and G will couple correctly with the corresponding pins L and M Tighten the 4 screws in the corresponding holes TAKING CARE OF THE SEWING MACHINE MOTOR Only a little care is required to keep the sewing machine motor in order for many years of good use The following are the most frequent causes for inferior service from the sewing machine motor and suggestions on how to prevent and remedy them Motor does not run at all or runs only sluggishly The above deficiency may be caused by the following circumstan ces 1 a The electric cords are defective loosely connected or not Connected at all The electric plugs the fuse or the wall outlet are defective The motor brushes are worn or the brush springs are ex cessively compressed or broken see section How to re place the motor brushes The rheostat motor control is out of order Check all of the abt ve items remedy any defects if possible or replace defective parts with new ones The belt between motor pulley and balance wheel of machine is too tight Loosen the two bracket screws A and B 117 Copyright 2004 Fig 102 Fig 102 and shift motor bracket until belt has just enough tension to pull the machine Tighten the two bracket screws Commutator of motor is dirty Clean connector with cleaning fluid then wipe it thoroughly dry How to
75. the nut No 041030 DA Screw or unscrew slightly the screw No 042090 GAB until a minimum distance of 3 64 between the push pin No 85589 and the conical part No 85545 is obtained Firmly tighten the nut No 041030 DA Now check whether the conical part No 85545 is being push ed out completely from part No 85544 see Fig 79 when the knob No D 85559 is completely pressed down in the darning position If this is not the case then the part No 85544 and also the Feed Dog Lifting Shaft No A 85508 are pushed too much to left toward the needle bar Therefore the adjustment has to be made toward the right toward the balance wheel If itis necessary to move the part No 85544 and the shaft No 85508 toward the right it will also be necessary to move the Feed Eccentric No 20026 on the upper shaft and the connecting rods Nos D 85506 and A 26345 in the same direction In this case it will be necessary again to check the timing of the Feed Dog in relation to the needle bar When reassembling the machine check again the adjustments a b c d and e as explained above The teeth of the Feed Dog must be about 5 64 to 7 64 below the needle plate when the knob No D 85559 is completely pressed down Adjust this distance with the aid of screw No 035150 GAN see Figs 55 and 80 93 Copyright 2004 ADJUSTMENT OF THE ECCENTRIC NO 85663 ON THE NEEDLE POSITIONING LEVER NO C 85662 FIG 81 This adjustment is made in the factory
76. the piece of paper is retained firmly between presser foot and feed dog at each of the four corners of the presser foot If this requirement is not met it may be due to three different causes Namely The presser foot either due to excessive wear or to improper fast ening to the presser bar does not rest correctly on the feed dog The feed dog is either excessively worn or it is not fastened pro perly in the machine There exists a combination of both aforementioned defects To adjust proceed as follows Replace the old presser foot with a new one 68 Copyright 2004 Repeat operations a b and c If the requirement d is not yet met proceed further as follows Replace the old feed dog with a new one and repeat again opera tions a b and c Here is the procedure to follow in order to change the feed dog Remove needle plate Fig 5 Remove the feed dog C by loosening the screws M Fig 60 Place the new feed dog on its support O Fig 60 and fasten it by inserting and tightening the screws M Make adjustment A 2nd case as explained in chapter Align ment of Feed Dog in relation to the slots in the Needle Plate Place needle plate in its receptacle and fasten it H i Fig 60 69 Copyright 2004 Minor adjustment of the feed dog In case the machine after the above described adjustments have been carried through does not yet feed correctly check the follo
77. the set screw No 04850 GEB in the oscillating crank shaft Fig 28 Assemble the machine completely Check the timing of the shuttle and the needle in the following manner Turn the balance wheel by hand slowly toward you until the need le has risen about 3 32 above its lowest position At this moment the point of the shuttle should be exactly at the center of the ris ing needle Fig 30 If this requirement is not met loosen the set screw No 048050 GEB in the oscillating crank shaft Fig 28 and turn the carrier shaft No C 26325 in the required direction until the point of the shuttle has reached the center of the needle which has remained stationary Tighten firmly set screw No 048050 GEB Operation No 2 can also be performed with the aid of the TIM ING GAUGE No 10 5 in the following manner Insert the gauge No 10 5 as explained in the paragraph Timing of shuttle and needle bar in the SUPERNOVA Bring the needle bar to its lowest position In this position the false needle if correctly adjusted will lie between the two timing lines A Fig 31 If the needle does not lie between the two timing lines A loosen the screw No 048050 GEB Fig 28 Now without moving the balance wheel turn the carrier shaft in the 32 Copyright 2004 required direction until the false needle lies between the two lines A Tighten screw No 048050 GEB firmly and remove the gauge Carry out the adjustments I Il Ill IV of the instruct
78. thread downward passing again through the slot F and into the guide hook K Pull the thread downward and by means of a twisting motion bring it into the thread guide N on the needle clamp h Finally guide the thread from left to right through the eye of the needle T pull the thread through the needle eye leaving about four inches of free thread hanging down from the needle Threading of the SUPERNOVA when using two needles twin needle The threading of the SUPERNOVA with double needle is illustrated in Fig 4 The unwinding of the thread from the two spools must take place as shown in Fig 4 to keep the two threads separated The two threads must pass separately through the upper and the lower holes of the thread guide S To keep the two threads separated pass one thread between the tension discs A and B and the other one between the ten sion discs B and C The thread running between the ten sion discs A and B must pass through the loop D of the check spring whereas the other thread must pass through the loop E of the same spring 11 Copyright 2004 The two threads must be inserted separately one in each of the two thread guides M and N on the needle clamp gt Fig 4 To disconnect the Automatic This operation has to be done when the machine is at a standstill Turn the design regulating knob clockwise until the square mark is in
79. wing points The pressure of the foot on the fabric is not correct When adjust ing the pressure of the foot keep in mind that Thick and heavy fabrics require a greater pressure than thin and light fabrics Light pressure is required for fine and sheer fabrics so as to prevent damage to the fabric The teeth of the feed dog are worn out A visual inspection of the feed dog and feeling the sharpness of its teeth by touching them gently usually is sufficient to determine whether the feed dog is worn to such a degree as to necessitate its replacement with a new feed dog HOW TO CONTROL THE PRESSURE OF THE PRESSER FOOT The pressure is controlled with the aid of the pressure regulating thumb No 85322 see Fig 61 By loosening the pressure regulating thumb screw the pressure of the presser foot can be released Make certain that the presser foot always exerts a certain pressure upon the fabric The pressure upon the fabric increases gradually as the pressure regulating thumb screw is turned down The number scale in front of the face plate in connection with the presser bar index pin No 85325 indicates the pressure exerted at the moment by the presser bar spring No 26050 upon the presser foot In this connection it should be mentioned that there is a well defined though loose interdependence between the pressure imposed by the presser bar spring and the tension of the upper thread Namely 70 Copyright 2004 Fig 61 w

Instructions For Servicing The Necchi Supernova Sewing Machine

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