Pfaff 481 Service Manual
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Pfaff 481 Service Manual

Pfaff 481 Service Manual

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481
483
Service manual
296-12-17 437
Justieranleitung engl. 1.97

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Summary of Contents for Pfaff 481

  • Page 1 Service manual 296-12-17 437 Justieranleitung engl. 1.97...

  • Page 2: Table Of Contents

    Checking and adjustment aid ..................3 Preliminary adjustment of the needle height ............. 4 Zeroing the feed motion ..................5-6 Zeroing the needle feed motion (not applicable to PFAFF 483) ......... 7 Feed lifting motion ..................... 8 Feed dog height ......................9 Feed driving motion ....................
  • Page 3 The screws and nuts in brackets ( ) are for the attachment of machine parts that must be loosened before the adjustments and tightened up again afterwards. Abbreviations t.d.c = top dead center b.d.c. = bottom dead center 3 PFAFF...

  • Page 4: Checking And Adjustment Aid

    Adjustment hole 4 = 1.8 mm past the bottom dead center of the needle bar (needle rise position). Adjustment hole 5 = top dead center of the needle bar (t.d.c. N). Adjustment hole 6 = 4 mm past bottom dead center of needle bar (4 past b.d.c). PFAFF 3...

  • Page 5: Preliminary Adjustment Of The Needle Height

    With the needle bar at b.d.c. there must be a clearance of 16.5 mm between needle holder and needle plate. 16,5 mm Move needle bar 1 (screw 2) according to the requirement. Make sure that, when looking in the feed direction, the needle retaining screw points to the right. 4 PFAFF...

  • Page 6: Zeroing The Feed Motion

    Rotate the handwheel and at the same time turn shaft 6 (screw 7) with the allen key according to the requirement. Remember that in the PFAFF 483 there must be a clearance of 8 mm between the bearing bush and actuating crank 8.
  • Page 7 Turn eccentric bushing 2 (screw 3) so that mark 4 is roughly at the bottom and the edge of the milled surface is at an angle of 45° to the machine front (for final adjustment see section 23). Turn crank 5 (screw 6) according to the requirement. 6 PFAFF...

  • Page 8: Zeroing The Needle Feed Motion (Not Applicable To Pfaff 483)

    Zeroing the needle feed motion (Adjustment not applicable to Pfaff 483) Requirement: With the stitch length control set at “0” the needle bar should make no feed motion when the handwheel is turned. Adjust needle feed regulating crank 1 (screw 2) according to the requirement.

  • Page 9: Feed Lifting Motion

    0.6 mm past b.d.c (cylindrical pin in hole “3”; for PFAFF 481) or 0.6 mm past t.d.c (cylindrical pin in hole “1”; for PFAFF 483). In this position, the notch in feed lifting eccentric 1 should be positioned perpendicularly below the center of the shaft.

  • Page 10: Feed Dog Height

    Requirement With the stitch length set at “0” and the needle bar at a position 0.6 mm past b.d.c (cylindrical pin in hole “3”, for PFAFF 481) and 0.6 past t.d.c. (cylindrical pin in hole “1”; for PFAFF 483) 1. the feed dog must be positioned in the middle of the needle plate slots when looked at from the side as well as in feeding direction.

  • Page 11: Feed Driving Motion

    Requirement With the longest stitch length set and the needle bar at 0.6 mm past b.d.c. (cylindrical pin in hole “3”; for PFAFF 481) the needle bar at 0.6 mm past t.d.c. (cylindrical pin in hole “1”; for PFAFF 483) the feed dog should not move when the reverse-feed control is moved up and down.

  • Page 12: Timing The Needle Feed Motion (Not Applicable To Pfaff 483)

    Timing the needle feed motion (Adjustment not applicable to PFAFF 483) Requirement Both the needle bar and the feed dog should remain motionless when reverse-feed control 3 is moved up and down with the machine set for its longest stitch and the needle bar set 0.6 mm past its b.d.c.

  • Page 13: Centering The Needle In The Needle Hole

    Centering the needle in the needle hole Requirement The needle must penetrate the needle hole right in the center. For PFAFF 481 Set the stitch length at “0” and position the needle right above the needle hole. Loosen screws 1 and 2.
  • Page 14 For PFAFF 483 Position the needle bar just above the needle hole. Loosen screws 1, 2 and 3. Position needle bar frame 4 both lengthwise and crosswise of the sewing direction according to the requirement and tighten screw 2 just lightly and screw 3 firmly.

  • Page 15: Eccentric Hook Shaft Bearing And Hook-To-Needle Clearance

    Turn bearing 3 according to requirement 1. Set the hook lightly against spin disc 4, shift bearing 3 - without turning it - according to requirement 2 and tighten screws 1 and 2. Position gear 5 (screws 6) according to requirement 3. 14 PFAFF...

  • Page 16: Needle Rise, Final Adjustment Of Needle Height And Bobbin Case Positioning Finger

    Adjust the hook (screws 1) without shifting it and the needle bar (screws 2) without turning it according to requirement 1. Set lug of positioning finger 3 into the slot in the bobbin case base; adjust and fix it according to requirement 2. PFAFF 15...

  • Page 17: Vertical Position Of Bobbin Case Opener

    Vertical position of bobbin case opener Requirement 1. Small hook (481 and 483) At the left point of reversal of bobbin case opener 3 the bobbin case opener finger must be roughly on one level with the lug of bobbin case base 4.

  • Page 18: Position Of Bobbin Case Opener

    0.6 mm behind the front edge of bobbin case cam 7. 3. Large hook and small hook (481 and 483) At the left point of reversal of bobbin case opener 3 there must be a clearance of roughly 0.3 mm between bobbin case base 6 and positioning finger 8 and stop screw 1 must be...

  • Page 19: Timing The Bobbin Case Opener

    Adjust bobbin case opener eccentric 1 (screws 2) according to the requirement. Adjustment aid: To facilitate checking insert a screwdriver in the slot of bobbin case opener 3. 18 PFAFF...

  • Page 20: Clearance Between Presser Foot And Needle Plate

    Press lifting bracket 4 downwards onto the raised lifting lever 5 and tighten screw 3. Remove the gauge and lower the presser foot onto the needle plate. PFAFF 19...

  • Page 21: Eliminating Feed Differences (Not Applicable To Pfaff 483)

    Eliminating feed differences (Adjustment not applicable to PFAFF 483) Requirement With the machine set for its longest stitch, both the feed dog and and the needle must make feed strokes of the same length when the handwheel is turned. Shift hinge stud 1 (nut 2) to adjust the feed stroke of the needle feed.

  • Page 22: Tension Release Mechanism

    When presser bar lifter 1 is raised both tension discs must be at least 0.5 mm apart. 0,5 mm Adjust tension release lever 2 (screw 3) according to the requirement. Lower the presser foot onto the needle plate. Now the tension must be fully activated. PFAFF 21...

  • Page 23: Thread Check Spring And Thread Regulator

    Shift thread regulator 4 (screws 5) according to requirement 2. Note: The stroke of thread check spring 3 and the position of thread regulator 4 are dependent on the type of thread and material used and should be adjusted according to the appearance of the seam. 22 PFAFF...

  • Page 24: Knee Lever Resting Position

    Raise the presser foot by means of the presser bar lifter. Push the knee lever joint on knee lever shaft 1 and let the connecting rod 2 engage in the joint. Turn stop screw 3 (nut 4) according to the requirement. PFAFF 23...

  • Page 25: Knee Lever Play

    1,3 mm Position the needle at its b.d.c. and let the presser foot down on the needle plate. Turn crank 1 (screws 2) according to the requirement. Make sure the vertical knee lever shaft has no end play. 24 PFAFF...

  • Page 26: Adjusting The Knee Lever Motion

    Push the knee lever until a noticeable resistance is felt; the presser foot must not yet lift off the gauge. First turn in stop screw 1 (nut 2) fully, then back out by half a turn. PFAFF 25...

  • Page 27: Bobbin Winder

    Switch on the bobbin winder and adjust drive wheel 1 (screw 2) according to the requirement. Place a bobbin on the winder spindle, thread the machine for bobbin winding and switch on the bobbin winder. To adjust the amount of thread wound shift regulating stud 3 (screw 4) according to the requirement. 26 PFAFF...

  • Page 28: Limiting The Stitch Length

    Set stitch length control lever 2 at the desired maximum stitch length. Set limiting angle 3 from above against control lever 2 and fix it (in the desired position) by tightening screw 1 in either the lower or the upper hole. PFAFF 27...

  • Page 29: Matching Forwards And Reverse Stitch Lengths

    Matching forwards and reverse stitch lengths Requirement When the stitch length is set at “3” the forwards feed must match the reverse feed. Turn bush 1 (screw 2) in accordance with the requirement. Make sure that the eccentricity of bush 1 points downwards. 28 PFAFF...

  • Page 30: Presser Foot Pressure

    Presser foot pressure Requirement Proper feeding of the material must be ensured even at top sewing speed. There must Contents Turn screw 1 according to the requirement. PFAFF 29...
  • Page 31 Notes...
  • Page 32 Aktiengesellschaft Postfach 3020 D-67653 Kaiserslautern Königstr. 154 D-67655 Kaiserslautern Telefon: (0631) 200-0 Telefax: (0631) 172 02 Telex: 45753 PFAFF D Gedruckt in der BRD Printed in Germany Imprimé en R.F.A. Impreso en la R.F.A. Stampato in R.F.G. e a a...

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