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Pfaff Industrial 937 Adjustment Manual

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937
ADJUSTMENT MANUAL
This adjustment manual applies to machines
from the serial number 8 300 001 and
software version 0435/005 onwards.
296-12-19 340/002
Instruction Manual engl. 10.16

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  • Page 1 ADJUSTMENT MANUAL This adjustment manual applies to machines from the serial number 8 300 001 and software version 0435/005 onwards. 296-12-19 340/002 Instruction Manual engl. 10.16...
  • Page 2 Reprinting, reproduction and/or translation of PFAFF adjustment manuals (including parts thereof) is only permitted with our prior agreement and citation of the source. PFAFF Industriesysteme und Maschinen GmbH Hans-Geiger-Str. 12 - IG Nord D-67661 Kaiserslautern...

  • Page 3: Table Of Contents

    Table of Contents Contents ..................Page Adjustment ........................... 5 Tools, gauges and other accessories ..................5 Abbreviations ......................... 5 Explanation of symbols ......................5 Checking and adjustment aid ....................6 Adjusting basic machine ......................7 .05.01 Compensation weight ......................7 .05.02 Needle in needle hole centre (in sewing direction) ..............
  • Page 4 Table of Contents Contents ..................Page .05.32 Bobbin lifter position ......................38 .05.33 Bobbin lifter movement ....................... 39 .05.34 Bottom feed dog height ...................... 40 .05.35 Clearance between the presser foot and needle plate ............41 .05.36 Top feed dog feed driving and connecting lever ..............42 .05.37 Top feed dog lift ........................

  • Page 5: Adjustment

    Unless otherwise stated, the machine must be disconnected from the mains before all adjustment work! Risk of injury due to accidental machine start-up! No screw clamp may be fastened to the needle bar on the PFAFF 937! This may damage the special needle bar coating. Notes on adjustment All adjustments in this manual are based on a fully assembled machine and may only be carried out by technical staff trained for this purpose.

  • Page 6: Checking And Adjustment Aid

    Adjustment Checking and adjustment aid It is possible to precisely locate the required needle bar positions through insertion in holes 1 - 5. Fig. 13 - 01 O Turn the handwheel until the needle bar has almost reached the required position. O Place the adjustment pin in the corresponding hole provided and press it down.

  • Page 7: Adjusting Basic Machine

    Adjustment Adjusting basic machine Compensation weight .05.01 Rule When the needle bar is in b.d.c., the largest eccentricity of the compensation weight 1 should be in the top position. Fig. 13 - 02 O Move the needle bar to b.d.c. O Turn the compensation weight 1 (screws 2) according to the rule.

  • Page 8: Needle In Needle Hole Centre (In Sewing Direction)

    Adjustment Needle in needle hole centre .05.02 (in sewing direction) Rule At zigzag stitch setting "0" and the "Middle" needle position setting, the needle should pierce the middle of the needle hole looking in the sewing direction. Fig. 13 - 03 O Move the needle bar to b.d.c.

  • Page 9: Needle Bar Parallel Guide

    Adjustment Needle bar parallel guide .05.03 Rule The guide bar 5 should be parallel to the needle bar. Fig. 13 - 04 O Move the needle bar to t.d.c. (hole 2). O Loosen the screws 1 and 2 and the nut 3. O Position the largest eccentricity of the pin 4 to down.

  • Page 10: Locking Lever

    Adjustment Locking lever .05.04 Rule The zigzag stitch adjusting lever 3 should lock in any position. Fig. 13 - 05 O Loosen the screw 2. O Press the locking lever 1 until it pushes up against the zigzag stitch adjusting lever 3. O Turn the pivot pin 4 to the left until it stops.

  • Page 11: Zero Stitch And Zigzag Stitch Scale

    Adjustment Zero stitch and zigzag stitch scale .05.05 Rule At zigzag stitch setting "0", 1. the needle bar should not move sideways when turning the handwheel, 2. the mark "0" on the scale 1 should match the mark 2. Fig. 13 - 06 O Set the needle position adjusting lever 4 to "Middle"...

  • Page 12: Needle In Needle Hole Centre (Crossways To Sewing Direction)

    Adjustment Needle in needle hole centre .05.06 (crossways to sewing direction) Rule At zigzag stitch setting "0" and the "Middle" needle position setting, the needle should pierce the middle of the needle hole looking crossways to the sewing direction. Fig. 13 - 07 O Turn the eccentric pin 1 (nut 2) according to the rule.

  • Page 13: Zigzag Stitch Width

    Adjustment Zigzag stitch width .05.07 Rule At the largest zigzag stitch setting, the mark 1 should match the largest zigzag stitch indication on the scale 2. Fig. 13 - 08 O Turn the zigzag stitch adjusting lever 3 according to the rule. O Move the screw 4 until it abuts at the top and tighten.

  • Page 14: Zigzag Stitch Movement

    Adjustment Zigzag stitch movement .05.08 Rule If the needle bar is in t.d.c. coming from the right bottom dead centre (adjustment hole "2"), the needle bar should not move sideways when moving the zigzag stitch adjusting lever back and forth. 5 mm Fig.

  • Page 15: Needle Hole Symmetry

    Adjustment Needle hole symmetry .05.09 Rule 1. At zigzag stitch setting "0", the needle puncture position should be in the middle of the needle hole. 2. At the largest zigzag stitch setting, the needle hole should be the same distance from the middle puncture position on the left and right.

  • Page 16: Needle Position Adjusting Lever

    Adjustment Needle position adjusting lever .05.10 Rule The left and right deflection of the needle should be the same size at both the largest zigzag stitch setting and the left or right needle position. Fig. 13 - 11 O Loosen the screws 1 and 2. O Set the needle position adjusting lever 3 to "Middle"...

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

    Adjustment Thumb wheels for the top feed .05.11 (in machines without -918/14) Rule If the guide pin 3 is located in the middle of the slotted lever and the ends of the racks 4 are in line, the zero marks of the thumb wheels 2 should be opposite the mark 5. Fig.

  • Page 18: Differential Zero Setting (In Machines Without -918/14)

    Adjustment Differential zero setting .05.12 (in machines without -918/14) Rule The reverse-feed key 11 should be in its highest position at the largest stitch length setting. In addition, the clamp crank 7 with its stop element 8 should abut the top regulating shaft.

  • Page 19: Top And Bottom Feed Synchronous Position (In Machines With -918/14)

    Adjustment Top and bottom feed synchronous position .05.13 (in machines with -918/14) Rule With a stitch length setting of "1.5" and when both of the levers 1 are in position "0", the top feed dog and bottom feed dog should move by the same stroke when turning the handwheel.

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

    Adjustment Position of the stitch length adjusting wheel .05.14 (in machines without -918/14) Rule With a stitch length setting of "0", the pointer 4 should be opposite the mark "0" of the scale 5. Fig. 13 - 15 O Turn the stitch length adjusting wheel 1 in the direction of the arrow until it stops. O Turn the eccentric pin 2 (nut 3) according to the rule.

  • Page 21: Position Of The Stitch Length Adjusting Wheel (In Machines With -918/14)

    Adjustment Position of the stitch length adjusting wheel .05.15 (in machines with -918/14) Rule When the adjusting wheel 1 is turned forwards until it stop, the "0" mark of the adjusting wheel 1 and the mark on the reverse-feed key should match. Fig.

  • Page 22: Bottom Feed Dog Zero Position (In Machines Without -918/14)

    Adjustment Bottom feed dog zero position .05.16 (in machines without -918/14) Rule The bottom feed dog should not move when turning the handwheel with stitch length setting "0". Fig. 13 - 17 O Loosen the screw 1. O Place the open-ended wrench (SW 27) on the spring tension ring 2 and use it to hold the regulating shaft 3 tightly.

  • Page 23: Bottom Feed Dog Zero Position (In Machines With -918/14)

    Adjustment Bottom feed dog zero position .05.17 (in machines with -918/14) Rule The bottom feed dog should not move when turning the handwheel with stitch length setting "0". Fig. 13 - 18 O Set the stitch length to "0". O Place the open-ended wrench (SW 27) on the spring tension ring 1 and use it to hold the regulating shaft 2 tightly.

  • Page 24: Top Feed Dog Connecting Rod

    Adjustment Top feed dog connecting rod .05.18 Rule With a stitch length setting of "0", the crank 3 of the top feed dog connecting rod 1 should be horizontal. Fig. 13 - 19 O Adjust the top feed dog connecting rod 1 (screw 2) according to the rule.

  • Page 25: Top Feed Dog Zero Position

    Adjustment Top feed dog zero position .05.19 Rule If the thumb wheels 3, or the adjusting lever 3 in machines with -918/14, are in position "0" and the stitch length is set to "0", the top feed dog should not move when turning the handwheel.

  • Page 26: Torsion Spring For The Reverse-Feed Key (In Machines Without -918/14)

    Adjustment Torsion spring for the reverse-feed key .05.20 (in machines without -918/14) Rule When the presser foot is raised, at the largest stitch length setting and when the thumb wheels 5 are in position "0", the reverse-feed key 4 should automatically go back to its top stop position when the key is pressed.

  • Page 27: Torsion Spring For The Reverse-Feed Key (In Machines With -918/14)

    Adjustment Torsion spring for the reverse-feed key .05.21 (in machines with -918/14) Rule When the presser foot is raised, at the largest stitch length setting and when the lever 4 is in position "0", the reverse-feed key 5 should automatically go back to its top stop position when the key is pressed.

  • Page 28: Torsion Spring For The Differential Regulating Shaft (In Machines Without -918/14)

    Adjustment Torsion spring for the differential regulating shaft .05.22 (in machines without -918/14) Rule When the presser foot is raised, at the stitch length setting "0" and when the thumb wheel 4 is set to "+ 4.5" and the thumb wheel 5 is set to "0", the guide pin 6 should rest in the slotted lever 7.

  • Page 29: Torsion Spring For The Differential Regulating Shaft (In Machines With -918/14)

    Adjustment Torsion spring for the differential regulating shaft .05.23 (in machines with -918/14) Rule When the presser foot is raised, at the largest stitch length setting and when the lever 4 is moved up to the top until it stops and the lever 5 is in position "0", the pointer 6 should rest on the lever 4.

  • Page 30: Bottom Feed Dog Sliding Movement

    Adjustment Bottom feed dog sliding movement .05.24 Rule At the largest stitch length setting and a needle bar position 1.0 after t.d.c. (hole 4), the bottom feed dog should not move when the reverse-feed key is pressed. Fig. 13 - 25 O Whilst continuously pressing the reverse-feed key, turn the eccentric 1 (screws 2) according to the rule (the cutout in the eccentric 1 must be visible).

  • Page 31: Bottom Feed Dog Lifting Movement

    Adjustment Bottom feed dog lifting movement .05.25 Rule At stitch length setting "0" and a needle bar position 0.25 mm after t.d.c. (hole 3), the bottom feed dog should be at its upper turning point. Fig. 13 - 26 O Turn the eccentric 1 (screw 2) according to the rule. The eccentric 1 must not be adjusted axially.

  • Page 32: Driving Belt In The Gear Box

    Adjustment Driving belt in the gear box .05.26 Rule The driving belt 4 should be tightened so that the machine does not move sluggishly and the gear wheels do not exhibit noticeable backlash. Fig. 13 - 27 O Adjust the eccentric bearing bush 1 (screw 2) so that the driving belt 4 is in the middle of the bobbin lifter drive wheel 3 and turn according to the rule.

  • Page 33: Hook Bearing Bracket

    Adjustment Hook bearing bracket .05.27 Rule The hook shaft should touch the top and side of the hook bearing bracket setting gauge 1. 438 - 439 Fig. 13 - 28 O Loosen the screw 3. O Swivel the bobbin lifter to the right and remove the hook. O Loosen the screw 2 and loosen the linear cam underneath by tapping gently on the screw head.

  • Page 34: Hook Lubrication

    Adjustment Hook lubrication .05.28 Rule A light oil strip should appear on a paper strip held over the needle plate cutout after approximately 10 seconds when the machine is running at full speed. Fig. 13 - 29 O Turn the screw 1 according to the rule.

  • Page 35: Pre-Calibrating The Needle Height

    Adjustment Pre-calibrating the needle height .05.29 Rule When the needle position is in t.d.c. (hole 2), the clearance between the needle point and the needle plate should be 19 mm. 19 mm Fig. 13 - 30 O Adjust the needle bar 1 (screws 2) without twisting according to the rule.

  • Page 36: Needle Bar Rise, Hook-To-Needle Clearance And Lower Bobbin Position Finger

    Adjustment Needle bar rise, hook-to-needle clearance and lower bobbin position finger .05.30 Rule 1. At the needle position setting "Middle", a zigzag setting of "0" and a needle bar position 2.0 after b.d.c.(hole 1), the hook point should be in the middle of the needle and the clearance between the needle and the hook point should be 0.05 to 0.1 mm.

  • Page 37: Readjusting Needle Height

    Adjustment Readjusting needle height .05.31 Rule If the hook point is in the middle of the needle at zigzag stitch setting "0" and the "Left" needle position setting, the top edge of the needle eye should be 0.5 mm below the hook point.

  • Page 38: Bobbin Lifter Position

    Adjustment Bobbin lifter position .05.32 Rule 1. There should be a clearance of 0.5 mm between the top edge of the bobbin lifter and the inner edge of the lower part of the bobbin case. 2. There should be a clearance of 0.8 mm between the bobbin lifter finger and the lower part of the bobbin case.

  • Page 39: Bobbin Lifter Movement

    Adjustment Bobbin lifter movement .05.33 Rule When the needle bar is positioned 2.0 after b.d.c. (hole 1), the bobbin lifter 3 should be in the right turning point. Fig. 13 - 34 O Turn the eccentric 1 (screws 2) according to the rule.

  • Page 40: Bottom Feed Dog Height

    Adjustment Bottom feed dog height .05.34 Rule At a stitch length setting of "0" and a needle bar position 0.25 mm after t.d.c. (hole 3), the bottom feed dog should be in the middle of the needle plate cutout and abut the feed dog height adjustment gauge along its entire length.

  • Page 41: Clearance Between The Presser Foot And Needle Plate

    Adjustment Clearance between the presser foot and needle plate .05.35 Rule When the hand lever is raised, the needle should pierce the "middle of the needle hole" of the presser foot exactly and the clearance between the needle plate and presser foot should be 7 mm.

  • Page 42: Top Feed Dog Feed Driving And Connecting Lever

    Adjustment Top feed dog feed driving and connecting lever .05.36 Rule 1. All the moving parts of the top feed dog should move freely and without any backlash. 2. The top feed dog must not touch the presser foot. Fig. 13 - 37 O Lower the presser foot with the hand lever 1.
  • Page 43 Adjustment O Move the lever 11 to its outer turning point. O Press the lever 7 in the feeding direction until you feel it reach the stop and tighten the screw 6. O Loosen the screw 12 and align the top feed dog foot according to rule 2. O Tighten the screw 12.

  • Page 44: Top Feed Dog Lift

    Adjustment Top feed dog lift .05.37 Rule At stitch length setting "0", when the presser foot is resting on the needle plate and the top feed foot is in its upper turning point, there should be the following clearance between the needle plate and the top feed foot depending on the type of top feed: 1.3 mm when the top feed dog is working behind the needle, 2.0 mm when the top feed dog is working in front of the needle, Fig.

  • Page 45: Top Feed Dog Lifting Movement

    Adjustment Top feed dog lifting movement .05.38 Rule The top feed dog should fit on the bottom feed dog when the upwardly moving bottom feed dog has reached the top edge of the needle plate at stitch length setting "2". Fig.

  • Page 46: Top Feed Dog Sliding Movement

    Adjustment Top feed dog sliding movement .05.39 Rule At the largest stitch length setting and a needle bar position 1.0 after t.d.c. (hole 4), the Top feed dog, vibrating presser feed dog should not move when- reverse-feed key is pressed. Fig.

  • Page 47: Feed Difference

    Adjustment Feed difference .05.40 Rule If the two top feed thumb wheels are in position "0" and the largest stitch length is set, the sliding movement of the top feed dog and bottom transporter should be the same when turning the handwheel. Fig.

  • Page 48: Top Feed Dog And Presser Foot Pressure

    Adjustment Top feed dog and presser foot pressure .05.41 Rule The material should be fed properly even at top sewing speed. No pressure marks should appear on the material. Fig. 13 - 42 O Position the top edge of the screw 1 approx. 13 mm below the top edge of the housing. O Loosen the nut 2.

  • Page 49: Thread Deflection Bow

    Adjustment Thread deflection bow .05.42 Rule When the needle bar is in b.d.c., the top edge of the thread guide hole should be at the same level as the lower edge of the thread deflection bow. Fig. 13 - 42 O Adjust the thread deflection bow 1 (screw 2) according to the rule, making sure that it is parallel to the bed plate.

  • Page 50: Knee Lever Travel Limit

    Adjustment Knee lever travel limit .05.43 Rule The hand lever should lower automatically and the presser foot should have lifted 7 mm off the needle plate when the knee lever is activated. Fig. 13 - 44 O Move the feed dog setting gauge under the presser foot with the cutout down and fit the presser foot.

  • Page 51: Knee Lever Backlash

    Adjustment Knee lever backlash .05.44 Rule There should be noticeable backlash between the nut 1 and the fork 3 when gently activating the knee lever. Fig. 13 - 45 O Turn the nut 1 (lock nut 2) according to the rule.

  • Page 52: Bobbin Winder

    Adjustment Bobbin winder .05.45 Rule 1. When the bobbin winder is switched on, the bobbin winder spindle should be moved easily, whereas when the bobbin winder is switched off, the friction wheel 3 must not touch the drive wheel 1. 2.

  • Page 53: Adjusting Thread Trimmer -900/24

    Adjustment Adjusting thread trimmer -900/24 Axial control cam position .06.01 Rule 1. The roller 5 should have a clearance of 0.3 mm to the control cam 1. 2. The retaining collar 3 should abut the control cam 1. 0.3 mm Fig.

  • Page 54: Control Cam (Pre-Calibrating)

    Adjustment Control cam .06.02 (pre-calibrating) Rule 1. The roller lever 4 should engage in the corresponding control cam cutout in the needle rise position (hole 1). 2. The control cam 1 should abut the retaining collar 3. Fig. 13 - 48 O Turn the control cam 1 (screws 2) according to rule 1 and adjust according to rule 2.

  • Page 55: Thread Catcher Position And Test Cut

    Adjustment Thread catcher position and test cut .06.03 Rule When the thread trimmer is in the neutral position, the edge of the thread catcher 6 should be flush with the edge of the mounting plate 4. Fig. 13 - 49 O Turn the connecting rod 1 (nuts 2, left and right-hand thread) according to the rule.

  • Page 56: Control Cam (Recalibrating)

    Adjustment Control cam (recalibrating) .06.04 Rule 1. The thread catcher 5 should start its forward movement when the end of the hook plate 3 is positioned at the level of the right edge of the bobbin case position finger 4. 2.

  • Page 57: Needle Thread Tension Release

    Adjustment Needle thread tension release .06.05 Rule 1. When the magnet 3 is activated, the tension discs 4 should be at least 0.5 mm away from each other. 2. When the thread trimmer device is in neutral position and the presser foot is on the needle plate, tension should be fully activated.

  • Page 58: Parameter Settings

    Adjustment Parameter settings O The separate parameter list for the machine describes how to select the user level and change parameters (see chapter 1.1.2 Technician level). Internet update of control P40 CD O You need a dongle with the appropriate machine software to be able to perform a control update.

  • Page 59: Circuit Diagrams 91-191 584-95

    91-191 584-95 Circuit diagram Part 1 Version 28/06/2016 Circuit Diagrams 91-191 584-95 PED-A PED-B PED-C PED-D n.c. PED-GEN P-ANA shield A PH B PH M1.1 IND. shield GN/YE Ground Sewing Motor Nähmotor n.c. n.c. n.c. +3,3V n.c. IN-EXT1 IN-EXT2 IN-EXT3 IN-EXT4 N.C.
  • Page 60 Circuit diagram 91-191 584-95 Version 28/06/2016 Part 2 180° SYNC. shield Boot_PN BOOT X_IN RXBF- TXBF+ +15V RST_IN RST_PN RXBF+ TXBF- +15V +3,3V IN_ana1 0V_Logik function control box P40 CD input manuel backtack input mount thread input invers backtack output led +24V stab.
  • Page 61 Notes...
  • Page 62 PFAFF Industriesysteme und Maschinen GmbH Hans-Geiger-Str. 12 - IG Nord D-67661 Kaiserslautern Tel.: +49 - 6301 3205 - 0 Fax: +49 - 6301 3205 - 1386 E-mail: info@pfaff-industrial.com Gedruckt in der BRD / Printed in Germany / Imprimé en la R.F.A. / Impreso en la R.F.A...

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