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Pfaff Industrial 937 Adjusiment Manual

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937
ADJUSTMENT MANUAL
This Adjustment Manual is valid for machines
from the following serial numbers onwards:
# 2 705 763
296-12-18 587/002
Justieranleitung engl. 01.13

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Summary of Contents for Pfaff Industrial 937

  • Page 1 ADJUSTMENT MANUAL This Adjustment Manual is valid for machines from the following serial numbers onwards: # 2 705 763 296-12-18 587/002 Justieranleitung engl. 01.13...
  • Page 2 The reprinting, copying or translation of PFAFF Service Manuals, whether in whole or in part, is only permitted with our previous authorization and with written reference to the source. PFAFF Industriesysteme und Maschinen AG Hans-Geiger-Str. 12 - IG Nord D-67661 Kaiserslautern...

  • Page 3: Table Of Contents

    Index Contents ..................Page Adjustment ........................... 5 Tools, gauges and other accessories for adjusting ..............5 Abbreviations ......................... 5 Explanation of the symbols ....................5 Check and adjustment aid ...................... 6 Adjusting the basic machine ....................7 .05.01 Balancing weight ........................7 .05.02 Centering the needle in the needle hole (in sewing direction) ..........
  • Page 4 Index Contents ..................Page .05.30 Needle rise, hook-to-needle clearance and bobbin case positioning-fi nger ......36 .05.31 Final adjustment of the needle height ................. 37 .05.32 Bobbin case opener position ....................38 .05.33 Bobbin case opener motion ....................39 .05.34 Bottom feed dog height ..................... 40 .05.35 Clearance between presser foot and needle plate ..............

  • Page 5: Adjustment

    Justierung Adjustment On the PFAFF 937 do not use a screw clamp on the needle bar! The special coating of the needle bar could be damaged. Please observe all notes from Chapter 1 Safety of the instruction manual! In particular care must be taken to see that all protective devices are refi tted properly after adjustment, see Chapter 1.06 Danger warnings of the instruction...

  • Page 6: Check And Adjustment Aid

    Justierung Check and adjustment aid By blocking with holes 1 - 5 the required needle bar positions can be fi xed ex- actly. Fig. 1 - 01 ● Turn the balance wheel until the needle bar has approximately reached the required position.

  • Page 7: Adjusting The Basic Machine

    Justierung Adjusting the basic machine Balancing weight .05.01 Requirement With the needle bar at bdc the largest eccentricity of the balancing weight 1 must be pointing upwards. Fig. 1 - 02 ● Bring the needle bar to b.d.c. ● Adjust the balance weight 1 (screw 2) in accordance with the requirement.

  • Page 8: Centering The Needle In The Needle Hole (In Sewing Direction)

    Justierung Centering the needle in the needle hole .05.02 (in sewing direction) Requirement With the zigzag setting at "0" and the needle position set at "middle" the needle must enter the center of the needle hole as viewed in the direction of sewing. Fig.

  • Page 9: Parallel Guiding Of The Needle Bar

    Justierung Parallel guiding of the needle bar .05.03 Requirement Guide bar 5 must be parallel to the needle bar. Fig. 1 - 04 ● Bring the needle bar to tdc (hole 2). ● Loosen screws 1,2 and nut 3. ● The largest eccentricity of pin 4 must be facing downwards. ●...

  • Page 10: Locking Lever

    Justierung Locking lever .05.04 Requirement The zigzag stitch adjustment lever 3 must be able to be locked in any position. Fig. 1 - 05 ● Loosen screw 2. ● Press locking lever 1 against the zigzag stitch adjustment lever 3. ●...

  • Page 11: Zero Stitch And Zigzag Stitch Scale

    Justierung Zero stitch and zigzag stitch scale .05.05 Requirement With the zigzag stitch set at "0": 1. the needle bar must not move laterally when the balancewheel is turned and 2. the marking "0" on scale 1 must be at marking 2. Fig.

  • Page 12: Centering The Needle In The Needle Hole (Crosswise To Sewing Direction)

    Justierung Centering the needle in the needle hole .05.06 (crosswise to sewing direction) Requirement With the zigzag stitch set at "0" and the needle position setting at "middle" the needle must enter the center of the needle hole as seen across the direction of sewing. Fig.

  • Page 13: Zigzag Stitch Width

    Justierung Zigzag stitch width .05.07 Requirement At the largest zigzag stitch setting, marking 1 must be at the largest zigzag value on scale 2. Fig. 1 - 08 ● Turn the zigzag stitch adjustment lever 3 in accordance with the requirement. ●...

  • Page 14: Zigzag Stitch Movement

    Justierung Zigzag stitch movement .05.08 Requirement When the needle bar, on the right of its throw, is positioned at t.d.c. (adjustment hole "2"), the needle bar should not move laterally when the zigzag stitch adjustment lever is mo- ved to and fro. 5 mm Fig.

  • Page 15: Needle Penetration Symmetry - Left, Centre And Right

    Justierung Needle penetration symmetry - left, centre and right .05.09 Requirement When the zigzag stitch is set at "0", the needle should penetrate in the centre of the needle hole. With the maximum zigzag stitch set, the needle should penetrate on the left and right at the same distance from the centre hole.

  • Page 16: Needle Position Adjustment Lever

    Justierung Needle position adjustment lever .05.10 Requirement The left and right throws of the needle must be the same size at the largest zigzag stitch setting and at the left or right needle position. Fig. 1 - 11 ● Loosen screws 1 and 2. ●...

  • Page 17: Adjustment Wheels For The Top Feed (On Machines Without -918/14)

    Justierung Adjustment wheels for the top feed .05.11 (on machines without -918/14) Requirement With guide pin 3 in the middle of the connecting link and the ends of the toothed racks 4 fl ush with each other, the zero markings on the adjustment wheels 2 must be at marking 5. Fig.

  • Page 18: Zeroing The Differentiation (On Machines Without -918/14)

    Justierung Zeroing the differentiation .05.12 (on machines without -918/14) Requirement At the longest stitch-length setting, the reverse sewing button 11 must be at its highest position. In addition, the stop fi nger 8 of clamp crank 7 must be touching the upper regu- lating shaft.

  • Page 19: Synchronizing The Top And Bottom Feed (On Mchines With -918/14)

    Justierung Synchronizing the top and bottom feed .05.13 (on mchines with -918/14) Requirement With the stitch length set at "1.5" and both levers 1 in the "0" position, when the balance wheel is turned the top and bottom feed dogs should travel the same path. Fig.

  • Page 20: Position Of The Stitch Length Adjustment Wheel (On Machines Without -918/14)

    Justierung Position of the stitch length adjustment wheel .05.14 (on machines without -918/14) Requirement When adjustment wheel 1 is turned as far forward as possible, the pointer 4 should be po- sitioned exactly opposite the mark "0" on scale 5. Fig.

  • Page 21: Position Of The Stitch Length Adjustment Wheel (On Mchines With -918/14)

    Justierung Position of the stitch length adjustment wheel .05.15 (on mchines with -918/14) Requirement When adjustment wheel 1 is turned as far forward as possible, the marking for "0" on adjustment wheel 1 and the marking on the reverse feed control should match. Fig.

  • Page 22: Zeroing The Bottom Feed (On Machines Without -918/14)

    Justierung Zeroing the bottom feed .05.16 (on machines without -918/14) Requirement With the stitch length set at "0" the bottom feed dog must not carry out any feeding motion when the balance wheel is turned. Fig. 1 - 17 ● Loosen screw 1. ●...

  • Page 23: Zeroing The Bottom Feed (On Machines With -918/14)

    Justierung Zeroing the bottom feed .05.17 (on machines with -918/14) Requirement With the stitch length set at "0" the bottom feed dog must not carry out any feeding motion when the balance wheel is turned. Fig. 1 - 18 ● Set the stitch length at "0". ●...

  • Page 24: Vibrating Presser Connecting Rod

    Justierung Vibrating presser connecting rod .05.18 Requirement With the stitch length set at "0", crank 3 on vibrating presser connecting rod 1 must be horizontal. Fig. 1 - 19 ● Move vibrating presser connecting rod 1 (screw 2) in accordance with the requirement.

  • Page 25: Zeroing The Vibrating Presser

    Justierung Zeroing the vibrating presser .05.19 Requirement With the adjusting dials 3 (on machines with -918/14, adjusting lever 3) in the "0" position and the stitch length set at "0", there should be no feeding motion of the top feed dog when the balance wheel is turned.

  • Page 26: Torsion Spring Of The Reverse Feed Lever (On Machines Without -918/14)

    Justierung Torsion spring of the reverse feed lever .05.20 (on machines without -918/14) Requirement With the presser foot raised, the longest stitch length set and the adjustment wheels 5 at "0", the reverse feed lever 4 must return automatically to its uppermost point after being activated.

  • Page 27: Torsion Spring Of The Reverse Feed Lever (On Machines With -918/14)

    Justierung Torsion spring of the reverse feed lever .05.21 (on machines with -918/14) Requirement With the presser foot raised, the longest stitch length set and the adjustment lever 4 at "0", the reverse feed lever 5 must return automatically to its uppermost point after being activa- ted.

  • Page 28: Torsion Spring Of The Differentiation Regulating Shaft (On Machines Without -918/14)

    Justierung Torsion spring of the differentiation regulating shaft .05.22 (on machines without -918/14) Requirement With the presser foot raised, the stitch length set at "0", adjustment wheel 3 at + 4.5 and adjustment wheel 4 at "0", guide pin 1 must be touching in connecting link 2. Fig.

  • Page 29: Torsion Spring Of The Differentiation Regulating Shaft (On Machines With -918/14)

    Justierung Torsion spring of the differentiation regulating shaft .05.23 (on machines with -918/14) Requirement When the presser foot is raised, the maximum stitch length set, lever 4 raised to its top po- sition and lever 5 set at "0", the pointer 6 should be touching lever 4. Fig.

  • Page 30: Feeding Motion Of The Bottom Feed Dog

    Justierung Feeding motion of the bottom feed dog .05.24 Requirement With the maximum stitch length set and the needle bar position 1.0 past tdc (hole 4), the bottom feed dog must not move when the reverse feed lever is pressed. Fig.

  • Page 31: Lifting Motion Of The Bottom Feed Dog

    Justierung Lifting motion of the bottom feed dog .05.25 Requirement With the stitch length set at "0" and the needle bar position at 0.25 mm past tdc (hole 3) the bottom feed dog must be at its upper point of reversal. Fig.

  • Page 32: Drive Belt In The Gearbox Housing

    Justierung Drive belt in the gearbox housing .05.26 Requirement Drive belt 4 must be tightened so that the machine runs freely and the belt sprockets do not have any noticeable play. Fig. 1 - 27 ● Adjust eccentric bearing bush 1 (screw 2) in accordance with the requirement and so that drive belt 4 is in the centre of bobbin opener drive wheel 3.

  • Page 33: Hook Bearing Bracket

    Justierung Hook bearing bracket .05.27 Requirement The hook shaft must be touching the hook bearing bracket adjustment gauge 1 at the top and the side. 438 - 439 Fig. 1 - 28 ● Loosen screw 3. ● Swing the bobbin case opener to the right and remove the hook. ●...

  • Page 34: Hook Lubrication

    Justierung Hook lubrication .05.28 Requirement When the machine is running at full speed, after about 10 seconds a fi ne oil streak should be visible on a strip of paper held over the needle plate cutout. Fig. 1 - 29 ●...

  • Page 35: Pre-Adjusting The Needle Height

    Justierung Pre-adjusting the needle height .05.29 Requirement With the needle bar at tdc (hole 2) the distance between the point of the needle and the needle plate must be 19 mm. 19 mm Fig. 1 - 30 ● Without turning it, adjust the needle bar (screws 1) in accordance with the requirement.

  • Page 36: Needle Rise, Hook-To-Needle Clearance And Bobbin Case Positioning-Fi Nger

    Justierung Needle rise, hook-to-needle clearance and bobbin case positioning-fi nger .05.30 Requirement 1. With the needle position set at "middle", the zigzag stitch setting at "0" and the needle bar position 2.0 past bdc (hole 1) the hook point must be in the middle of the needle and the distance between the needle and the hook point must be 0.05 - 0.1 mm.

  • Page 37: Final Adjustment Of The Needle Height

    Justierung Final adjustment of the needle height .05.31 Requirement With the zigzag stitch set at "0", the needle position set at "left" and the hook point in the middle of the needle, the top edge of the needle eye must be 0.5 mm underneath the hook point.

  • Page 38: Bobbin Case Opener Position

    Justierung Bobbin case opener position .05.32 Requirement 1. There must be a clearance of 0.5 mm between the top edge of the bobbin case opener and the inner edge of the bottom section of the bobbin case. 2. Between the bobbin case opener fi nger and the bottom section of the bobbin case opener there must be a clearance of 0.8 mm.

  • Page 39: Bobbin Case Opener Motion

    Justierung Bobbin case opener motion .05.33 Requirement With the needle bar 2.0 past bdc (hole 1) the bobbin case opener 3 must be at its right point of reversal. Fig. 1 - 34 ● Adjust bobbin opener eccentric 1 (screws 2) in accordance with the requirement.

  • Page 40: Bottom Feed Dog Height

    Justierung Bottom feed dog height .05.34 Requirement With the stitch length set at "0" and the needle bar position at 0.25 past tdc (hole 3) the bottom feed dog must be in the middle of the needle plate cutout and be touching the feed dog height-adjustment gauge along its entire length.

  • Page 41: Clearance Between Presser Foot And Needle Plate

    Justierung Clearance between presser foot and needle plate .05.35 Requirement With the hand lever raised the needle must enter exactly in the middle of the needle hole in the presser foot and the clearance between the needle plate and the presser foot must be 7 mm.

  • Page 42: Vibrating Presser Feed And Connecting Lever

    Justierung Vibrating presser feed and connecting lever .05.36 Requirement 1. All moving parts of the vibrating presser must function freely and without play. 2. The vibrating presser must not touch the presser foot. Fig. 1 - 37 ● Lower the presser foot using hand lever 1. ●...
  • Page 43 Justierung ● lever 8 and into the hole in lever 7. ● Tighten screw 10. ● Bring lever 11 to its outer point of reversal. ● Press lever 7 in the direction of feed until you feel it stop and then tighten screw 6. ●...

  • Page 44: Vibrating Presser Stroke

    Justierung Vibrating presser stroke .05.37 Requirement With the stitch length set at "0", the presser foot resting on the needle plate and the vibra- ting presser foot at its upper point of reversal, there must one of the following clearances between the needle plate and the vibrating presser foot, depending on the model of the vi- brating presser foot.

  • Page 45: Vibrating Presser Lifting Motion

    Justierung Vibrating presser lifting motion .05.38 Requirement The vibrating presser must be touching the bottom feed dog when the rising bottom feed dog has reached the top edge of the needle plate with the stitch length set at "2". Fig. 1 - 39 ●...

  • Page 46: Vibrating Presser Feeding Motion

    Justierung Vibrating presser feeding motion .05.39 Requirement At the maximum stitch length and with the needle bar at 1.0 past tdc (hole 4), the vibrating presser must not move when the reverse feed key is moved up and down. Fig. 1 - 40 ●...

  • Page 47: Feeding Motion Difference

    Justierung Feeding motion difference .05.40 Requirement With both top feed adjustment wheels at "0" and the largest stitch length set, the feeding strokes of the vibrating presser and the bottom feed dog must be the same length. Fig. 1 - 41 ●...

  • Page 48: Vibrating Presser And Presser Foot Pressure

    Justierung Vibrating presser and presser foot pressure .05.41 Requirement The material must be fed reliably even at top sewing speed. There must be no pressure marks on the material. Fig. 1 - 42 ● The top edge of screw 1 must be approx. 13 mm underneath the top edge of the hou- sing.

  • Page 49: Thread Diverter Pin

    Justierung Thread diverter pin .05.42 Requirement With the needle bar at bdc the top edge of the thread guide hole must be at the same height as the bottom edge of the thread diverter. Fig. 1 - 42 ● Move thread diverter 1 (screw 2) in accordance with the requirement, ensuring that it remains parallel to the base plate.

  • Page 50: Limiting The Knee Lever Stroke

    Justierung Limiting the knee lever stroke .05.43 Requirement When the knee lever is pressed the hand lever must drop automatically and the presser foot must be just over 7 mm above the needle plate. Fig. 1 - 44 ● Place the feed dog gauge under the presser foot with its recess facing downwards. ●...

  • Page 51: Knee Lever Play

    Justierung Knee lever play .05.44 Requirement When lightly pressing the knee lever there should be a noticeable play between nut 1 and fork 3. Fig. 1 - 45 ● Turn nut 1 (locknut 2) in accordance with the requirement.

  • Page 52: Bobbin Winder

    Justierung Bobbin winder .05.45 Requirement 1. With the bobbin winder engaged the bobbin winder spindle must be turned reliably, but friction wheel 3 must not touch drive wheel 1 when the bobbin winder is switched off. 2. The bobbin winder must disengage automatically when the thread is approx. 1 mm from the edge of the bobbin.

  • Page 53: Adjusting The Thread Trimmer -900/24

    Justierung Adjusting the thread trimmer -900/24 Axial position of the control cam .06.01 Requirement 1. Roller 5 should be at a distance of 0.3 mm from the control cam 1. 2. Adjustment ring 3 should be touching the control cam 1. 0,3 mm Fig.

  • Page 54: Preliminary Adjustment Of The Control Cam

    Justierung Preliminary adjustment of the control cam .06.02 Requirement 1. In the needle rise position (hole 1) the roller lever 4 should lock into the corresponding groove of the control cam. 2. The control cam 1 should be touching adjustment ring 3. Fig.

  • Page 55: Position Of The Thread Catcher And Cutting Test

    Justierung Position of the thread catcher and cutting test .06.03 Requirement When the thread trimmer is in its neutral position, the edge of thread catcher 6 should be fl ush with the edge of the mounting plate 4. Fig. 1 - 49 ●...

  • Page 56: Readjustment Of The Control Cam

    Justierung Readjustment of the control cam .06.04 Requirement 1. When the end of the hook guard 3 is level with of the right edge of the bobbin case position fi nger 4, the thread catcher 5 should begin moving forwards. 2.

  • Page 57: Needle Thread Tension Release

    Justierung Needle thread tension release .06.05 Requirement 1. When solenoids 1 are activated, the tensions disks 4 should be at least 0.5 mm apart. 2. When the thread trimmer is in its neutral position and the sewing foot is positioned on the needle plate, the tension should be fully effective.

  • Page 58: Switch Diagrams

    Pneumatics-switch diagram 91-191 281-95 Version 01.10.04 Switch diagrams Pneumatics-switch diagram...

  • Page 59: Circuit Diagrams

    Circuit diagrams Circuit diagrams Reference list for circuit diagrams 91-191 469-95 Controller P40 ED Control panel S3 Sewing head identifi cation (OTE) Initiator zig-zag stitch control Sewing lamp LED Stitch counter Sewing motor -771/05 knife motor (optional) Main switch Pedal set value transmitter Key for -771/05 knife motor (optional) Manual backtacking Needle position change key...
  • Page 60 Circuit diagrams 91-191 469-95 Version 01.02.06 Part 1...
  • Page 61 91-191 469-95 Circuit diagrams Part 2 Version 01.02.06...
  • Page 62 Circuit diagrams 91-191 469-95 Version 01.02.06 Part 3...
  • Page 63 Note...
  • Page 64 PFAFF Industriesysteme und Maschinen AG Hans-Geiger-Str. 12 - IG Nord D-67661 Kaiserslautern Phone: +49 - 6301 3205 - 0 Fax: +49 - 6301 3205 1386 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 Printed in Germany...

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