Singer 20U31 Service Manual Download Page 9 | Manualshive

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From the library of Superior Sewing Machine & Supply LLC - www.supsew.com

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Summary of Contents for 20U31

Page 1: ...Service Manual SINGER 20u31 33 35 MACHINES THE SINGER COMPANY...

Page 2: ...late To Obtain Uniform Straight Stitch To Set Feed Dog at Correct Height To Centralize Feed Dog in Throat Plate Slots To Set Presser Bar at Correct Height Timing the Feed Positioning the Feed and Feed...

Page 3: ...ht needle positions Spring biased stitch width selector which can also be set at desired stitch width SPECIFICATIONS Maximum stitch width Maximum stitch length Needle bar stroke Height of presser foot...

Page 4: ...Stagger Feeding Puckering Zigzag Noise Place of Adjustmen Hitch Stitch Stitches 1 Thread X X X X 2 Need 1e X X X X X X 3 Needle Bar X X X X 4 Rotating Hook X X X s Bobbin Case X X X 6 Needle Thread T...

Page 5: ...ectly positioned at the factory and it SHOULD NOT BE DISTURBED ADJUSTMENT If needle bar is not set at correct height then adjustment should be made as instructed belm 1 With machine set for straight s...

Page 6: ...JUSTMEN1 If the t1m1ng of rotating hook in relation to the needle requires correc tion make adjustments as instructed below 1 Set machine for straight stitching at center needle position 2 Remove rota...

Page 7: ...as explained in paragraph A TO TIME THE ROTATING HOOK TO ADJUST SIDEWISE MOVEMENT OF NEEDLE WHILE IN TI E MATERIAL ZIGZAG STITCHING 0 0 05 Hook Point Needle Fig 3 When zigzag stitching the needle must...

Page 8: ...f the stitch regulator fork loosen arm shaft horizontal worm gear set screws and turn arm shaft worm gear as required until the triangular cam set screws are in either one of the two positions shown i...

Page 9: ...left and right needle locations in relation to the center of needle hole in throat plate Also check left and right needle locations in relation Lo the needle hole with need le position set at left and...

Page 10: ...chine pulley over toward you and check existence of sidewise movement of needle Fig 11 5 If there is a sidewise movement in the needle loosen bight amplitude stop plate left set screw and move left bi...

Page 11: ...From the library of Superior Sewing Machine Supply LLC www supsew com BIGHT AMPLITUDE REGULATOR AND NEEDLE POSITION SELECTOR MEQiANISHS VIEWED FROM BACK OF MACHINE Fig 12 9...

Page 12: ...egulating Screw Bight and Needle Position Lever Arm Regulating Screw Bight Amplitude Slide Block Crank Set Sere Bight Amplitude Slide Block Crank Shaft Bight and Needle Position Block Bight and Needle...

Page 13: ...regulator for maximum stitch width 2 Place a light card under presser foot turn machine pulley and make light needle punctures in the card and check width of zigzag stitch 3 If maximum stitch width of...

Page 14: ...nstructed above D SETTING THE LEFT NEEDLE POSITIO 1 Set needle position selector on left needle position and turn machine pulley to bring needle to its lowest position 2 Move stitch width regulator to...

Page 15: ...on and stitch width regulator for straight stitching Then lower needle into hole in throat plate and check needle location 3 If the needle location in relation to the needle hole in throat plate need...

Page 16: ...IGHT STITCHING TO SET FEED DOG AT CORRECT HEIGITT When feed dog is at its highest position the teeth should project 1 02 1 09 mm above the top surface of the throat plate If feed log is set too low pr...

Page 17: ...llel to the throat plate slots LENGTI fWISE SETTING 1 Set machine for maximum stitch length 2 Loosen feed rock shaft crank clamping screw Fig 17 and move feed bar and feed rock sha t as required 3 Sec...

Page 18: ...left loosen screw center at left end of feed rock shaft Fig 20 as required and tighten the other screw center an equal amount b To move feed dog toward right loosen screw center at right end of feed...

Page 19: ...presser bar is at its highest point and needle bar at its lowest top of presser foot should clear the lower end of needle bar SETTING 1 Remove needle and loosen presser bar pressure regulating thumb...

Page 20: ...ess Down Against Presser Bar Lifter 6 35 mm r Fig 22 Fig 23 TIMING THE FEED Presser Bar Guide Bracket Set Screw Fig 24 The motion of feed dog in relation to the needle should be as follows 1 The feed...

Page 21: ...ifting eccentric appears in sight 2 Adjust feed and feed lifting eccentric so that the point of second screw namely the feed and feed lifting eccentric position screw will locate in the V groove provi...

Page 22: ...quired then securely tighten clamping screw when correct position is obtained If setting angle of feed rock shaft crank on feed rock shaft need to be reset due to making the above adjustment adjust as...

Page 23: ...on regulating thumb nut is on the stud 4 To adjust tension insert a large screwdriver in the slot of the tension stud Turn stud to the left to decrease tension or to the right to increase tension Tigh...

Page 24: ...should be a slight amount of backlash Hold ann shaft worm gear immovable by holding machine pulley and eel for backlash by moving zigzag triangular cam sidewise with finger If there is too much play...

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