Singer U141A User's Manual
Contents
1. Service SINGER Manual ODUCTS U141A A Trademark of THE SINGER COMPANY Copyright 1981 THE SINGER COMPANY All Rights Reserved Throughout the World CONTENTS DESCRIPTION TEE AONE SN 3 LUBRICATION 3 5 OPERATOR INFORMATION 6 7 DUS TIME NT Siena Reus 8 17 INDEX Arm Shaft Connection Belt Replacement 22 17 881911901898747 Ay DESEE Mal rado E 3 Bobbin Case Opener Adjusting 15 EUDTISSHIOR yu ats Muka 3 4 Bobbin Case Opener 15 BERGE SEA Swine Geb ee bene Ss ee oe 5 Bobbin Case Removal From Sewing Hook 14 Needie Bar Height 11 Bobbin Removal oo dows sos gas pv eru 7 Needle Bar Position Relatlve to Presser Bar 1 Bobbin Replacement 7 Needle Bar Rock Frame Removal 2 17 Bobbin Thread Tension 8 Needle Setting MM MTM 5 Bobbin Winding 7 Needle Thread Tension 8 Description of 152 1165 _ 1 2 Pressure on Material 2 9 Feed Dog Adjustment 16 P TEES eG te E 5 Feed Eccentric Adjustment 2 16 Stitch Length Regulation 9 Feed Reversing LLL 9 Lever Removal 17 Feed Reversing Mechanism Adjustment2. 11 Thread Controller MEME 8 Hook Height C 12 Thread Tensions e 8 Hook 4 5 Threading Bobbin Case 7 Hook Position Relative to Needle 2 13 Threading Lower g 7 Hook 14 Threading Upper 22 6 Hook Timing 13 DESCRIPTION OF MACHINES High speed two needles long arm lock stitch compound feed vertical axis hook flat bed machine for corsets overalls and clothing generally GENERAL FEATURES The compound feeding mechanism which consists of a needle feed and drop feed prevents slipping of the upper and lower plies of material when being stitched and assists in two or more plies being fed evenly to the end of seam Vertical axis hook with metered lubrication Hooks can be removed without disturbing the hook shafts Adjustable feed driving eccentric located on hook driv ing shaft produces a uniform stitch length at all speeds Feed reversing mechanism controlled by hand or foot Arm shaft hook shaft and belt driven bed shaft are mounted in ball bearings at rear and in automatically lubri cated plain bearings at front Plunger for changing length of stitch is on top surface of bed Sleeve type take up Belt drive Knee lifter Federal stitch type 301 SPECIFICATIONS Needle bar stroke 1 5 16 33 34 mm Take up stroke 2
3. Tighten machine pulley set screws PULLEY SET SCREWS ARM SHAFT CONNECTION COVER PLATE BELT PULLEY Fig 39 Turn machine pulley over toward you until thread take up lever is at its highest position Then turn hook drivina shaft until the setting mark A on lever pulley is in line with setting mark B cut into machine bed as shown in Fig 41 With both arm shaft and hook driving shaft in position slip belt over lower pulley This procedure should correctly time sewing hook with needle Check timing as indicated on page 13 NEEDLE BAR FRAME SHAFT CLAMP SCREW ROCK FRAME SETTING MARK B SETTING MARK A LOWER PULLEY Fig 41 INFORMATION FOR REFERENCE PURPOSE SKETCH OF SEWING MACHINE TABLE Unit mm SINGER REAR SIDE 1170 LOCATION OF KNEE LIFTER Fig 42 Form U 3240 Rev 182 Part No 543245 02 Rev 1 Printed in Japan
4. 079 52 8 mm Clearance under presser foot 1 4 6 35 mm Maximum stitch length 6 SP 4 2 mm Maximum speed 4 000 SPM Bed 609011 20 3 8 517 5 mm Bed width 7 177 8 mm Space at right of needle 9 5 8 244 5 mm Needle Cat 1901 5 Type A or C INSTALLATION Fasten dric can to table with its right edge in tne with machine belt slot in tabie Fasten knee lifter brac et in location shown in Fig 1 Assemble it so that lifter rod does not strike drip pan Screw siots in bracket provide nec adjustment Set stop stud to stop the action of knee lifter as soon as presser foot is raised enough trio hand iever LUBRICATION For the lubrication of the machine only SINGER OIL TYPE A or C suppiied by THE SINGER COMPANY should be used In order to insure proper function of the machine and to prevent any excess wear o the moving parts and bearings the machine should be oiled regularly in case of continuous use it should be oiled even more often if it is used to produce lona seams and run steadily Fill machine arm reservoir to high mark on oil sight gauge as indicated in F ig 2 The machine arm reservoir contains an oi vibrating pump which releases oi only when the machine is operat ing Fig 3 shows the oi filler hole for hook saddle reservoirs Remove oil gau
5. it the thread does not wind evenly loosen lock nut and turn tension bracket up or down as required then tighten lock nut Sobbins can be wound while the machine is sewing TO REPLACE THE BOBBIN AND THREAD THE BOBBIN CASES The following instructions apply to both bobbin cases Hold the bobbin between the thumb and forefinger of the right hand with the thread from the bobbin as shown in Fig 13 place it on the center stud of the bobbin case then push down the latch as shown Draw the thread into the slot 1 in the edge of the bobbin case and back of the projection 2 leaving a loose end of thread about two inches long above the slide When closing the slides leave just enough space for the threads to pass through LIFT OUT BOBBIN Fig 11 LOCK NUT TENSION BRACKET LIFT LATCH MORE TENSION LESS TENSION Fig 14 TENSION STUD SPRING STOP THREAD TENSIONS Tension on thread should be as light as possible yet sufficient to correctly set stitches in material NEEDLE THREAD TENSION Regulate needle thread tension only when presser foot is down To increase tension turn thumb nut shown in Fig 14 clockwise To decrease tension turn thumb nut counterclockwise BOBBIN THREAD TENSION Bobbin thread tension is regulated by the screw nearest to the center of tension spring on the outside of the bobbin case shown in Fig 15 Turn machine pulley stowly until screw is acce
6. G DISC COLLAR LOCKING SCREW DISC SPRING GIB A TING SCREW LOCKING 0 FEED DOG ADJUSTMENT Before adjusting feed dog regulate stitch length for longest stitch If feed dog is correctly adjusted all teeth should rise evenly and completely above throat plate as shown in Fig 36 If adjustment is required first remove throat plate then tip machine back and turn machine pulley over toward you until feed dog is at its highest position Loosen fork screw shown in Fig 37 and raise or lower feed dog to correct position Re tighten fork screw Feed dog should be set so that when needle is at lowest position of cycle it will be slightly in front of center point of needle hole in feed doa If needle is not correctly located in needle hole tip machine back to loosen pinch screws shown in Fig 37 and adjust feed dog to correct position Prior to above adjustment check needle bar to presser bar setting FEED ECCENTRIC ADJUSTMENT The feed eccentric is provided with a gib which can be adjusted to take up unnecessary play between feed ec centric and eccentric body To adjust gib first loosen two locking screws beside gib and turn in two adjusting screws in gib until all play is eliminated and eccentric fits snugly into slot of eccentric body Securely tighten two locking screws The feed driving eccentric adjusting disc spring provides pressure against feed eccentric cam to prevent it from mov ing out of oosition wh
7. cessary but care should be taken to prevent guard from interfering with normal path of needle TIMING THE SEWING HOOK Set feed driving eccentric to eight stitches per inch Remove throat plate and turn machine pulley over toward you until lower timing mark on needie bar is just visible at lower edge of needle bar frame on upward stroke of needle With needle in this position sewing hook is correctly timed if hook points are as shown on Fig 29A LEFT NEEDLE CENTER LINES OF V NEEDLES RIGHT NEEDLE 9 HOOK POINT FRONT OF MACHINE HOOK POINT Fig 29A 1 sewing hook is not correctly timed loosen socket screws shown in Fig 29 and turn hook to proper timing position as specified above Tighten socket screws HOOK SADDLE SCREW HOOK DRIVING GEAR Fig 27 NEEDLE GUARD Fig 28 SOCKET SCREWS Fig 29 REMOVING BOBBIN CASE FROM SEWING HOOK BOBBIN CASE Remove hook gib screws indicated in Fig 30 from sew ing hook Lift off hook gib and remove bobbin case HOOK GIB SCREWS HOOK GIB SOCKET SCREWS REMOVING SEWING HOOK FROM MACHINE BALL BEARING RETAINER SCREWS Remove presser foot throat plate and feed dog Loosen hook hub socket screws shown in Fig 30 Lift hook off end of shaft HOOK SHAFT Fig 31 REMOVING HOOK SHAFT To remove hook shaft first remove ball bearing retainer screws directly under hook sh
8. ease pressure or upward to decrease pressure REVERSE FEED MECHANISM To reverse feed direction by hand push reverse lever completely down in order to have same stitch length as in forward stitching position REVERSE LEVER Fig 19 m ym se HOLE IN REVERSE FEED LEVER Fig 20 To reverse the feed with foot treadle the foot treadle chain should be connected to hole in reverse feed lever shown in Fig 20 Release hand lever or foot treadle only when you wish to resume forward stitching ADJUSTMENTS SETTING NEEDLE BAR 211U157 When needie bar is at lowest position of its cycle the correct gauge distance from throat plate seat to needle stop in needle bar is 991 inch 25 16 mm Needle bar is correctly set when at the lowest position of its cycle the upper timing mark is just visible at lower edge of needle bar frame as shown in Fig 21 if needle bar is not correctly set loosen needle bar connecting stud clamp screw shown in Fig 21 and correct needle bar position Re tighten needle bar connecting stud clame screw DISTANCE OF NEEDLE BAR FROM PRESSER BAR The distance between needle bar and presser bar after requlating stitch length so that there is no feed movement should be 17 32 1349 mm as shown in Fig 21 1 the distance between needle bar and presser bar is more or less than 551 inch 14 0 mm first turn machine Sulley over toward you until needle bar is at highest po
9. eedles ROLL OVER 0 TOWARD you oe Either left or right twist thread can be used in bobbin To determine thread twist hold thread as shown in Fig 9 With left hand holding one end of thread twirl other end with thumb and forefinger of right hand over toward you If left twist thread strands will wind tighter If right twist thread strands will unwind or separate UPPER THREADING Turn machine pulley over toward you until needle bar Draw about 2 inches of thread through needle eye to is at highest position start sewing Pass thread through threading points as indicated in Fig 10 Threading Needle MOVE TO HIGHEST POINT Fig 10 LOWER THREADING BOBBIN REMOVAL 1 Open slide plates in bed of machine Turn machine pulley over toward you until needle bar reaches highest position Raise bobbin latches and lift out bobbins as indicated in Fig 11 BOBBIN WINDING Place bobbin on spindle as far as it will go Pass the thread from the thread unwinder through threading points as shown in Fig 12 Wind end of thread around the bobbin a few times Press latch against bobbin then start the machine The bobbin winder will stop automatically when the amount of thread for which it is regulated is wound upon the bobbin For more thread on bobbin loosen screws and swing latch away from bobbin for less thread on bobbin swing latch toward bobbin Tighten screws
10. ges as shown in Fig 3 and fill hook saddle reservoirs to full mark on gauges To lubricate the hook gears and opener gears a generous supply of oil should be applied AT LEAST TWICE DAILY to the two oil holes EDGE OF 46 117 2 MACHINECUT OUT LIFTER ROD BEFORE STARTING MACHINE FILL TO HIGH MARK HIGH MARK CHECK TWICE DAILY OIL GAUGE CHECK TWICE DAILY OIL HOLE FILL RESERVOIR TO HIGH MARK Fig 3 Fig 4 shows the areas of the bed surface to where oil should be applied Fig 5 shows the areas of bottom of the bed to where oil should be applied HOOK LUBRICATION The bobbin case raceway is lubricated by oil pumped from the hook saddle reservoir while the machine is operat ing The amount of oil received by hook receway is very important To check this first remove bobbin case Then with the machine running hold a small piece of white paper near the hook for about 10 seconds A distinct spray of oil should be visible on the paper f there is no trace of oil or an excess of oil on the paper proceed with the following steps 1 Tip machine and loosen control valve set screw shown dina lu sapi diis CONTROL VALVE SET SCREW 2 Turn contro valve screw shown in Fig 7 clockwise for more oil counterclockwise for less oil Re ti
11. ghten control valve set screw A short test run of at least a minute should be made between adjustments to insure uniform oil flow After each adjustment of oil contro valve screw oil control valve set screw should be securely tightened SPEED Maximum speed for machine 212U 141 is 4000 stitches per minute NEEDLES For machine 212U141 use Singer Needles Catalog 1901 Size of needle for a particular operation is determined by size of thread and type of material to be sewn Orders for needles should state quantity required size number and catalog number For example 100 Needles Size 14 Catalog 1901 SETTING THE NEEDLES Turn the machine pulley over toward you until the needle bar moves up to its highest point Loosen the set screws in the needle holder and put the needles up into the holder as far as they will go the inside needle or the one nearest the upright part of the arm having its long groove toward the left and the outside needle or the one farthest from the upright part of the arm having its long groove toward the right the eyes of both needles being directly in line with the arm of the machine then tighten the set screws CONTROL VALVE SCREW Fig 7 MOVE NEEDLE BARN LOOSEN SCREW INSERT NEEDLE UP AS FAR AS IT WILL GO AND TIGHTEN SCREW GROOVES MUST FACE WITH EACH OTHER Fig 8 THREAD It is recommended that left twist thread be used in HOLD THIS END both n
12. ile the machine is operating The disc spring collar may be moved to right or left to adjust spring pressure Normally collar is set flush with hub of eccentric body SET SCREW TAKE UP LEVER REMOVAL OF TAKE UP LEVER Remove arm top cover and face plate Loosen take up lover hinge stud set screw shown in Fig 39 Remove take up lever hinge stud and take up guard Lift take up lever out through slot A in of arm shown in Fig 39 REMOVAL OF NEEDLE BAR ROCK FRAME Remove face plate and arm top cover Loosen take up lever hinge stud set screw shown in Fig 39 Extract take up lever hinge stud take up guard and take up lever Remove cover from front of machine arm Loosen needle bar frame shaft clamp screw shown in Fig 40 Pull needie bar rock frame with its shaft from machine REPLACEMENT OF ARM SHAFT CONNECTION BELT Remove needle to avoid damage before proceeding to replace belt Tip machine and slide belt off lower pulley shown in Fig 41 Loosen two set screws in machine pulley and remove pulley and ball bearing Lift belt up and draw it around arm shaft through space at B indicated in Fig 39 Replace belt through ball bearing space of B After placing belt over arm shaft connection belt pulley replace machine pulley with ball bearing To remove all end play from shaft tighten set screws in machine pulley and hold ing needle bar crank in place tap machine pulley into posi tion with palm of hand
13. ng position Pass a 032 inch 0 8 mm shim between bobbin case stop finger and throat plate If shim is too tight or too loose turn machine pulley over toward you so that the hook hub socket screws shown in Fig 26 are accessible with a socket wrench Loosen both screws and remove cloth washer from bobbin case Turn hook unti one of the holes is in line with hook height adjusting screw To raise hook turn hook height adjusting screw downward To lower hook turn hook height adjusting screw up Re tighten socket screws and turn hook height adjusting screw again just enough to leave a light tension Check sewing hook timing 12 ADJUSTMENT OF DISTANCE BETWEEN SEWING HOOK AND NEEDLE To prevent hook point from dividing strands of thread it should pass as near to the needle as possible without hitting it Turn machine pulley over toward you until sewing hook point is in the position nearest to needle Tip machine and loosen hook saddle screws shown in Fig 27 Adjust hook inti hank naint ie ae close t needio ac noccihle without hitting it Retighten hook saddie screws BE SURE HOOK DRIVING GEAR SHOWN IN FIG 27 IS COR RECTLY SET WITH RELATION TO FACE OF HOOK SADDLE USE 008 INCH 0 2 mm SHIM NEEDLE GUARD The function of the needle guard shown in Fig 46 is to prevent hook point from striking needle if needle is de flected after penetrating material The needle guard can be bent with a pair of pliers if ne
14. own in Fig 31 Tip machine back and loosen hook shaft gear hub socket screws shown in Fig 32 Lift out shaft from top end If shaft does not lift out easily loosen screws in cover plate of hook saddle just enough at first to permit the oi to drain out Then remove cover plate completely being careful not to damage the gasket Tap the end of hook shaft GASKET 3 GASKET SOCKET COVER PLATE COVER PLATE SCHEME Fig 32 TIMING BOBBIN CASE OPENER Turn machine pulley over toward you until lower timing mark on needle bar is even with edge of needle bar frame on upward stroke of needle When needle bar is in this posi tion reference mark A should line up with reference mark B on hook saddle as indicated in Fig 33 If opener shaft is out of time tip machine back and loosen socket screws shown in Fig 34 Return machine to upright position and turn opener driving shaft with screw drive in cap screw shown in Fig 33 Tighten socket screws in opener driving aear hub CAP SCREW CAP SCREW Fig 33 SOCKET SCREWS SOCKET SCREWS ADJUSTING BOBBIN CASE OPENER The bobbin case opener shown in Fig 35 should be set so that it turns the bobbin case enough to make a sufficient opening for the free passage of thread between throat plate and bobbin case BOBBIN CASE STOP FINGER BOBBIN CASE e THROAT PLATE FEED DOG PINCH SCREWS FORK SCREW ECCENTRIC ADJUSTIN
15. si iion Remove cover plate from front of machine arm Loosen needle bar frame clamp screw shown in Fig 22 Move needle bar frame forward or backward to correct its position Re tighten clamn screw ADJUSTING FEED REVERSING MECHANISM Adjust stitch length to 6 stitches per inch on the 212U141 machine Loosen screw A and adjust crank shown in Fig 23 so that the above stitch length can be obtained When you depress the reversing lever the eccentric head of the bearing pin B should rest against the bearing block Loosen set screws C and turn bearing pin B until the stitch length is the same in reverse feed as in forward feed Tight en all screws 13 49 mm 1132 UPPER TIMING MARK NEEDLE BAR FRAME CLAMP SCREW 3 2 71222 079 2 0 mm CLEARANCE 032 0 8 mm Fig 25 HOOK HEIGHT ADJUSTING SCREW HOOK HUB SOCKET SCREWS Fig 26 ADJUSTMENT OF SEWING HOOK HEIGHT When lower timing mark on needle bar is just visible at lower end of needle bar frame on upward stroke of needle the hook should pass about 079 inch 2 0 mm above upper edge of needle eye as shown in Fig 24 And the clearance between bobbin case stop finger and throat plate should be 032 inch 0 8 mm as shown in Fig 25 TO ADJUST HEIGHT OF SEWING HOOK To adjust height of sewing hook first fasten throat plate to bed of machine and place bobbin case stop finger in sew i
16. ssible To increase tension turn screw inward To decrease tension turn screw outward THREAD CONTROLLER The thread controller should draw up slack thread before needle point enters fabric to prevent needle from penetrating thread To adjust thread controller loosen set screw A shown in Fig 16 Turn thread controller spring stop COunterclock wise for more controller action on thread or clockwise for less action Tighten set screw A Thread controller action TENSION should be increased for heavy thread and decreased for light thread To adjust thread controller action tension loosen set screw B shown in Fig 16 Turn tension stud slightly coun terclockwise for more tension or clockwise for less tension Tighten set screw B STITCH LENGTH REGULATION 1 With machine OFF depress button shown in Fig 3 Turn machine pulley in direction when a longer 27 on bed surface NEVER DEPRESS BUTTON stitch is desired less SPI and in direction when WHEN MACHINE IS ON a shorter stitch is desired more SPI 2 Turn machine pulley over toward you slowly until 4 Release button NEVER START MACHINE UNTIL button drops snaps into position BUTTON IS RELEASED PRESSURE ON MATERIAL ADJUST Pressure of presser foot on material should be as light as possible while being sufficient to insure correct feeding Pressure is regulated by screw shown in Fig 18 at rear of machine arm Turn screw downward to incr
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