Singer 270-37 Service Manual Download | Manualshive

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From the library of: Superior Sewing Machine & Supply LLC

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Summary of Contents for 270-37

Page 1: ...R COMPANY Copyright 1964 by The Singer Company Copyright Under international Copyright Union All Rights Reserved under Inter Americon Copyright Union A Trademark of THE SINGER COMPANY fe Printed In U S A From the library of Superior Sewing Machine Supply LLC ...

Page 2: ...hanism Adjustments 19 20 Needle Bar Height 20 Hook Positioning Longitudinal 19 Hook Timing 19 Sewing Reel 25 Speed 5 Stop Motion Adjustments 9 11 Arm Shaft 9 Engaging Arm 10 Starting Lever 9 Starting Lever Arm Stop 10 Tripping Linkage 11 Stop Motion Broke 18 Threading the Machine 6 Thread Stripper and Retracting Adjustments 22 Finger Plate Follower 22 Retracting Finger 22 Stripper Finger 22 Thread...

Page 3: ...ting ends of thread are present At the end of the stitching pattern thread is trimmed and excess thread is removed from reel and drawn away by a suction type air pump GENERAL CHARACTERISTICS 18 Stitches 6 parallel 2 cross over 6 parallel 4 tying Rotating Hook with Thread Reel makes two revolutions to each revolution of arm shaft Rotary Hook Shaft driven by spiral bevel gear from vertical arm shaft...

Page 4: ...s fit into hinge plates at back of recess and should not support machine except when it is tilted back Install blower unit in accordancewith instructions Form 21207 included in shipping carton Attach adjustable yokes to machine levers as shown in Fig 4 Fig 4 Attaching Yokes to Levers Belt guard cover fits into bracket and encloses drive and stop motion mechanism see Fig 3 From the library of Super...

Page 5: ...congealed or dis appeared entirely NOTE Once each year machine pulley loose should be removed and repacked with ball bearing lubricant OIL OIL Fig 5 Lubricating the Machine Cl eaning Remove all lint and abrasive matter from around hook body and throat plate mechanism see Fig 6 Wipe off all excess oil which may come in con tact with material to be sewn Machines not in use should be kept well oiled ...

Page 6: ...ook facing the operator as shown Securely tighten needle clamping screw THREAD CUTTER Stitching Troubles Check needle often to make sure these defects are not present Wrong needle for thread and material in use a cause of thread breakage Bent needle clogged needle eye or dirty needle groove a cause of skipped stitches THREADING THE MACHINE The correct threading proceedure for Machine 270 37 is sho...

Page 7: ...WHEN THREAD BREAKS CHECK Is machine threaded properly Is needle correctly seated in needle bar Is needle bent or burred Is thread suitoble for needle in use Is needle thread tension too tight WHEN THREAD SNAGS OR MACHINE SKIPS STITCHES CHECK Is needle eye or groove dirty Is needle bent or burred Is needle size correct for operation Is thread suitable for material in use Is reel cose free of thread...

Page 8: ...eral fevd linkage 2 Increase or decrease lateral movement of feed bar 3 Center and position longitudinal feed link age 4 Increase or decrease longitudinal move ment of feed bar C Feed Timing Adjustment 1 Time longitudinal feed movement 2 Time lateral feed movement IV TRIPPING POINTS ADJUSTMENT A Set timing to actuate interlocking arm V STOP MOTION BRAKE ADJUSTMENTS A Obtain brake clearance B Adjus...

Page 9: ... Pig 13 At this position there should be approximately 1 32 inch clearance between high point of camming surface on machine pulley and interlocking arm as shown in Pig 12 SETTING Loosen lock nut on starting rod and remove hinge screw shown in Pig 11 Turn swivel on starting rod Fig 11 in or out one full turn for each 1 32 inch of adjustment re quired to obtain clearance between camming surface and ...

Page 10: ...eck adjustment ENGAGING ARM CHECK Engaging arm should be adjusted so the V belt drops approximately 1 32 inch when machine moves from run position to stop position See Fig 15 SETTING Loosen pinch screw Fig 15 and position en gaging arm closer to or farther from starting cop as shown Tighten pinch screw securely and check adjust ment NOTE Check TENSION on V BELT Excessive tightness will not improve...

Page 11: ...or until rock shaft lever rests on tripping point as shown in Fig 17 At this position bell crank pawl should lift out of notches in bell crank far enough for machine to move into stop when actuated by tripping point on feed cam as shown in Fig 17 SETTING With rock shaft lever resting on tripping point loosen rock shaft pinch screw with socket wrench as shown in Fig 16 Using socket wrench as a leve...

Page 12: ...nd lift up on driven arm with screwdriver to bring lifting lug against back of bell crank as shown Maintain this position while tightening pinch screw securely Then rotate machine pulley again until the point is reached just before interlocking arm drops into notch on pulley stop position Set adjusting pin eccentric while depressing clamp lifting lever arm so that pawl on lifting arm does not enga...

Page 13: ...IPER SETTING Loosen wiper support screw Fig 22 and posi tion wiper support so that slot in body finger is horizontal Tighten wiper support screw Position wiper wire to clear needle by approx mately 1 16 inch THREAD PULL OFF LOOP CHECK The pull off loop should draw sufficient thread from the unwinder to complete the stitch pattern Also pull off loop should not whip and may be controlled by increasi...

Page 14: ...r and cam supporting gear by loosening socket head screw inside supporting gear screw as shown in Fig 24 By means of hex head on supporting gear screw turn the bracket which is eccentric until only minimum amount of play exists between gears Then tighten socket head screw inside supporting gear screw FEED LINKAGES NOTE Adjust lateral and longitudinal feed linkages when changing from two or from fo...

Page 15: ...ed plate to bring needle into right rear hole of button Then tighten screw B SETTING 2 To increase or decrease distance Loosen lateral driving arm stud nut as shown in inset Fig 27 BUTTON CENTERED LATERALLY CLAMP SCREW B DRIVING ARM 11 ninpfi inirnrn im Fig 26 Needle positioned above Button When sewing two hole buttons move stud toward rear of machine allowing feed bar positioner to reg ister over...

Page 16: ... LINKAGE SETTING 1 To obtain equal distance Insert button to be sewn into clamp engage ma chine into run position and rotate machine pulley until needle is just above button see Fig 28 Loosen screws C and D shown in Fig 29 and move feed plate so that button is centered longitudi nally along the bed under the needle as shown At this position longitudinal rock shaft driving arm and driven arm should...

Page 17: ...ement is timed by loosening the three cam mounting screws shown in Fig 32 and rotating the cam toward left as viewed from the bottom of machine to speed up the longitudinal feed in relation to needle movement or toward right to slow down the feed in relation to needle movement When adjustment is correctly set securely tighten three cam mounting screws LATERAL SETTING Lateral feed movement is timed...

Page 18: ...HOE 1 32 INCH SET SCREW PINCH SCREW Fig 35 Adjusting the Stop Motion Brake 18 SETTING Engage machine in run position and loosen the set screw shown in Fig 35 Turn eccentric stud until brake shoe clears machine pulley by approximately 1 32 inch Then tighten set screw PRESSURE CHECK Brake pressure should be regulated to prevent machine from going into stop too hard to avoid damage to machine parts W...

Page 19: ...n two bevel gear set screws HOOK TIMING Radial Position CHECK Loop taking occurs when needle bar has risen 100 inch from bottom dead center position At this position hook point should be at centerline of needle as shown in Fig 38 NOTE A gauge for positioning needle KX inch from bottom dead center position is available upon specific request at additional charge SETTING Loosen two hook body screws s...

Page 20: ...ig 40 Adjusting the Winding Linkage 20 WINDING LINKAGE CHECK Reel winding linkage should be set to clomp the needle thread in throat of hook body as shown in inset A Fig 40 SETTING Remove cylinder arm cover and turn machine pulley until tripping lever rests on tripping point as shown in inset B Fig 40 Then loosen lever arm pinch screw and lock screw on knurled nut as shown Make certain that trippi...

Page 21: ... than one full revolution from loop taking 11 to 12 o clock SETTING 1 Tripping Point Loosen set screw shown in Fig 41 and position tripping point to engage the winding mechanism when the hook point has rotated approximately 1 4 revolution post loop taking Securely tighten set screw SETT1NG2 Tripping Point Extension Loosen two set screws in tripping point extension and move extension to obtain the ...

Page 22: ...uld be accomplished within 1 8 revolution of hook SETTING Loosen lock nut on knife roller as shown in Fig 44 Adjust position of stud so that stripper finger starts its return as soon as thread is picked up Then tighten lock nut securely NOTE Check movement to make sure that stripper finger does not interfere with needle thread on pre vious stitch Stripper finger should extend far enough to pick up...

Page 23: ...ly tighten knife holder screw Loosen two screws in adjusting plate and set ad justable knife so that cutting edge does not pass center of needle hole bushing in throat plate when knife holder is rotated Tighten two screws Assemble throat plate to machine meshing knife holder pinion gear with knife rack as shown in Fig 48 The first tooth on knife rack must mesh with first space between teeth on pin...

Page 24: ...e knife loosen lock nut shown in Fig 50 and turn adjusting screw clockwise or counter clockwise as required When satisfactory cutting pressure has been obtained tighten lock nut securely LOOP PICK UP FINGER CHECK Motion of loop pick up finger Fig 51 is con trolled by the movement of the eccentric stud in cam path of knife holder pinion See inset Fig 51 When the eccentric stud is at the start of tr...

Page 25: ...section out from beneath the hook threod guard making certain that stripper finger does not change its position as shown in Fig 54 Lift reel holder upward and out of machine Remove large head screw from reel and remove reel from holder as shown in Fig 55 CAUTION Do not lose small circular spring located behind reel REPLACEMENT Insert reel in holder and fasten securely with large head screw Replace...

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