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Pfaff 481 Service Manual

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481
483
SERVICE MANUAL
296-12-17 437
Justieranleitung engl.
06.09

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Summary of Contents for Pfaff 481

  • Page 1 SERVICE MANUAL 296-12-17 437 Justieranleitung engl. 06.09...

  • Page 2: Notes On Safety

    Notes on safety ● The machine must only be operated in full knowledge of the instruction book and by persons with appropriate training. ● Before commissioning the machine also read the motor manufacturer’s safety notes and instruction manual. ● The machine must only be used for the purpose intended. It must not be operated without the safety devices it is equipped with;...

  • Page 3: Checking And Adjustment Aid

    Checking and adjustment aid By inserting the cylindrical pin in one of the adjustment holes 1 to 6 it is possible to fix the required needle bar positions very precisely. Turn the handwheel until the needle bar is roughly in the required position. Insert the 5 mm thick cylindrical pin in the specified adjustment hole and press against it.

  • Page 4: Preliminary Adjustment Of The Needle Height

    Preliminary adjustment of needle height Requirement 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.

  • Page 5: 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 6 Zeroing procedure with the gearbox open ● Raise the presser foot and set the stitch length control lever 1 at its lowest position. ● 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°...

  • Page 7: 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 8: 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 9: 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 10: 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 11: 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 12: 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 13 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 14: Eccentric Hook Shaft Bearing And Hook-To-Needle Clearance

    Eccentric hook shaft bearing and hook-to-needle clearance Requirement 1. The notch in bearing 3 (see arrow) must be visible from below. There must be a slight but still noticeable play between gears 5 and 7. 2. With the hook set lightly against spin disc 4 and the hook point opposite the center line of the needle, there must be clearance of less than 0.1 mm between the hook point and the clearance cut of the needle.

  • Page 15: Needle Rise, Final Adjustment Of Needle Height And Bobbin Case Positioning Finger

    Needle rise, final adjustment of needle bar height and bobbin case positioning finger Requirement With the stitch length set at “0” and the needle bar at a position 1.8 mm past b.d.c. (cylindrical pin in hole “4”) 1. the hook point must be opposite the center line of the needle and the top edge of the needle eye must be 0.8 mm below the bottom edge of the sewing hook.

  • Page 16: 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 17: 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 in...

  • Page 18: Timing The Bobbin Case Opener

    Timing the bobbin case opener Requirement In needle bar position 1.8 mm past b.d.c. (cylindrical pin in hole “4”) bobbin case opener finger must be at its right point of reversal. ● 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.

  • Page 19: Clearance Between Presser Foot And Needle Plate

    Clearance between presser foot and needle plate Requirement With presser bar lifter 1 raised there must be a clearance of 5 mm between presser foot and needle plate. Note: When the presser foot is raised to its top position upon actuating the knee lever fully or by means of the automatic presser foot lift -910/..

  • Page 20: 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 21: Tension Release Mechanism

    Tension release mechanism Requirement 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.

  • Page 22: Thread Check Spring And Thread Regulator

    Thread check spring and thread regulator Requirement 1. Thread check spring 3 must have moved by its full stroke by the time the point of the needle enters the material (stroke approx. 7 mm). 2. Thread regulator 4 must be fixed in the elongated hole so that thread check spring 3 moves by 1 mm by the time the hook has widened the thread loop to its maximum.

  • Page 23: Knee Lever Resting Position

    Knee lever resting position Requirement When at rest, knee lever connecting rod 2 must be at right angles with the bedplate. ● 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.

  • Page 24: Knee Lever Play

    Knee lever play Requirement When the presser foot is resting on the needle plate, there must be a clearance of 1.3 mm between lifting lever 3 and lifting piece 4. 1,3 mm ● Position the needle at its b.d.c. and let the presser foot down on the needle plate. ●...

  • Page 25: Adjusting The Knee Lever Motion

    Adjusting the knee lever motion Requirement When the knee lever is pushed by the full amount of its travel, there must be a clearance as indicated in the table below between presser foot and needle plate and the presser bar lifter should drop by its own weight.

  • Page 26: Bobbin Winder

    Bobbin winder Requirement When the bobbin winder is engaged, the winder spindle should be driven reliably; when the bobbin winder is disengaged, however, drive wheel 1 must not contact friction wheel 5. The bobbin winder should stop automatically when the thread wound on the bobbin has reached a point about 1.0 mm below the bobbin rim.

  • Page 27: Limiting The Stitch Length

    Limiting the stitch length ● Loosen screw 1 (accessible through the assembly hole) or turn it out according to the limit to be set. ● 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.

  • Page 28: 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.

  • Page 29: 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.

  • Page 30: 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 31 Note...
  • Page 32 PFAFF Industriesysteme und Maschinen AG Hans-Geiger-Str. 12 - IG Nord D-67661 Kaiserslautern Phone: +49 - 631 200-0 Fax: +49 - 631 17202 E-mail: info@pfaff-industrial.com Hotlines: Technical service: +49 - 175/2243-101 Application consultance: +49 - 175/2243-102 Spare-parts hotline: +49 - 175/2243-103...

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483

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