Pfaff Industrial 918 Adjustment Manual
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Pfaff Industrial 918 Adjustment Manual

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918
938 U
ADJUSTMENT MANUAL
938
938 U
This adjustment manual applies to machines
from the serial number 8 300 001 and
software version 0435/006 onwards.
296-12-19 338/002
06
18
Instruction Manual engl.
.

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  • Page 1 938 U ADJUSTMENT MANUAL 938 U This adjustment manual applies to machines from the serial number 8 300 001 and software version 0435/006 onwards. 296-12-19 338/002 Instruction Manual engl.
  • 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

    .05.08 Zigzag stitch movement (only on the 918 and 938) ............. 14 .05.09 Needle hole symmetry - left, middle and right (only on the 918 and 938) ......15 .05.10 Multi-stitch movement (only on the 918U and 938U) ............16 .05.11...
  • Page 4 Table of Contents Contents ..................Page Adjusting the under-edge trimmer -771//05 ................ 40 .06.01 Neutral knife position ......................40 .06.02 Knife height ......................... 41 .06.03 Knife position ........................42 .06.04 Knife drive switch ........................ 43 .06.04 Workpiece protection guard ....................44 Adjusting thread trimmer -900/24 ..................

  • 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 with the PFAFF 918 and 938! 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 needle position setting “Middle”, 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 marking “0“ on scale 1 should match the marking 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 needle position setting “Middle“, 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 marking 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 to the top and tighten.

  • Page 14: Zigzag Stitch Movement (Only On The 918 And 938)

    Adjustment Zigzag stitch movement .05.08 (only on the 918 and 938) Rule If the needle bar is in t.d.c. (adjustment hole “2“) coming from the right bottom dead centre, the needle bar should not move sideways when moving the zigzag stitch adjusting lever back and forth.

  • Page 15: Needle Hole Symmetry - Left, Middle And Right (Only On The 918 And 938)

    Adjustment Needle hole symmetry - left, middle and right .05.09 (only on the 918 and 938) Rule At zigzag stitch setting “0“, the needle puncture position should be in the middle of the needle hole. 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: Multi-Stitch Movement (Only On The 918U And 938U)

    Adjustment Multi-stitch movement .05.10 (only on the 918U and 938U) Rule 1. If the needle is in the right-hand puncture position in b.d.c., the cutout 5 of the control cam 3 should be level and point backwards. 2. The sideways movement of the needle bar should end when the needle punctures the workpiece (carry out a check at the largest zigzag setting).

  • Page 17: Zigzag Movement (Only On The 918U And 938U)

    Adjustment Zigzag movement .05.11 (only on the 918U and 938U) Rule If the needle bar is in t.d.c. (hole 2) coming from the right b.d.c., the needle bar should not move sideways when moving the zigzag stitch adjusting lever 4 back and forth. Fig.

  • Page 18: Target Positioning Device Sensor (Only On The 918U And 938U)

    Adjustment Target positioning device sensor .05.12 (only on the 918U and 938U) Rule There should be a clearance of 0.2 - 0.3 mm between the sensor 1 and the control cam 3. Fig. 13 - 13 O Adjust the sensor 1 (screws 2) according to the rule.

  • Page 19: Needle Position Adjusting Lever

    Adjustment Needle position adjusting lever .05.13 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 - 14 O Loosen the screws 1 and 2. O Set the needle position adjusting lever 3 to “Middle“...

  • Page 20: Bottom Feed Dog Zero Position (With A Closed Gear Box)

    Adjustment Bottom feed dog zero position .05.14 (with a closed gear box) Rule The bottom feed dog should not move when turning the handwheel with stitch length regulation “0“. Fig. 13 - 15 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 21: Bottom Feed Dog Zero Position (With An Open Gear Box)

    Adjustment Bottom feed dog zero position .05.15 (with an open gear box) Rule The bottom feed dog should not move when turning the handwheel with stitch length regulation “0“. Fig. 13 - 16 O Switch the machine on. O Whilst continuously turning the handwheel, turn the deflection crank 1 (screw 2) according to the rule.

  • Page 22: Bottom Feed Dog Sliding Movement

    Adjustment Bottom feed dog sliding movement .05.16 Rule At the largest stitch length setting and a needle bar position 1.0 mm after t.d.c. (hole 4), the bottom feed dog should not move when the reverse-feed button is pressed. Fig. 13 - 17 O Whilst continuously pressing the reverse-feed button, turn the slide eccentric 1 (screws 2) according to the rule (the cutout in the slide eccentric 1 must be visible).

  • Page 23: Bottom Feed Dog Lifting Movement

    Adjustment Bottom feed dog lifting movement .05.17 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 at its upper turning point. Fig. 13 - 18 O Turn the lifting eccentric 1 (screw 2) according to the rule.

  • Page 24: Driving Belt In The Gear Box

    Adjustment Driving belt in the gear box .05.18 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 - 19 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 25: Hook Bearing Bracket

    Adjustment Hook bearing bracket .05.19 Rule The hook bearing bracket should touch the top and side of the hook bearing bracket adjustment gauge 1. 438 - 439 Fig. 13 - 20 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 26: Hook Lubrication

    Adjustment Hook lubrication .05.20 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 - 21 O Turn the screw 1 according to the rule.

  • Page 27: Pre-Calibrating The Needle Height

    Adjustment Pre-calibrating the needle height .05.21 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 - 22 O Adjust the needle bar (screws 1) without twisting according to the rule.

  • Page 28: 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 .05.22 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 29: Readjusting Needle Height

    Adjustment Readjusting needle height .05.23 Rule If the hook point is in the middle of the needle at zigzag stitch setting “0“ and needle position setting “Left“, the top edge of the needle eye should be 0.5 mm below the hook point.

  • Page 30: Bobbin Lifter Position

    Adjustment Bobbin lifter position .05.24 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 31: Bobbin Lifter Movement

    Adjustment Bobbin lifter movement .05.25 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 - 26 O Turn the bobbin lifter eccentric 1 (screws 2) according to the rule.

  • Page 32: Bottom Feed Dog Height

    Adjustment Bottom feed dog height .05.26 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 33: Clearance Between The Presser Foot And Needle Plate

    Adjustment Clearance between the presser foot and needle plate .05.27 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 5 mm.

  • Page 34: Presser Foot Pressure

    Adjustment Presser foot pressure .05.28 Rule The material should be transported properly even at top sewing speed. No pressure marks should appear on the material. Fig. 13 - 29 O Turn the screw 1 according to the rule. If necessary, the sewing foot pressure can be increased ( ) or reduced ( ).

  • Page 35: Needle Thread Tension Release (In Machines Without -900/24)

    Adjustment Needle thread tension release .05.29 (in machines without -900/24) Rule When the hand lever is raised, the tension discs should be at least 0.5 mm apart. 0.5 mm Fig. 13 - 30 O Loosen the screw 1 and press the connecting rod 2 down until it touches. O Raise the presser foot.

  • Page 36: Thread Deflection Bow

    Adjustment Thread deflection bow .05.30 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 - 31 O Adjust the thread deflection bow 1 (screw 2) according to the rule, making sure that it is parallel to the bed plate.

  • Page 37: Knee Lever Travel Limit

    Adjustment Knee lever travel limit .05.31 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 - 32 O Move the feed dog adjustment gauge under the presser foot with the cutout down and fit the presser foot.

  • Page 38: Knee Lever Backlash

    Adjustment Knee lever backlash .05.32 Rule There should be noticeable backlash between the nut 1 and the fork 3 when gently activating the knee lever. Fig. 13 - 33 O Turn the nut 1 (nut 2) according to the rule and secure it with the nut 2.

  • Page 39: Bobbin Winder

    Adjustment Bobbin winder .05.33 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 40: Adjusting The Under-Edge Trimmer -771//05

    Adjustment Adjusting the under-edge trimmer -771//05 Neutral knife position .06.01 Rule When the adjusting lever 1 is in position “0“, the knife should lift as little as possible. 90° Fig. 13 - 35 O Unscrew the knurled nut of the adjusting lever 1 (screw 2). O Remove the cover 3 (screws 4).

  • Page 41: Knife Height

    Adjustment Knife height .06.02 Rule When the adjusting lever 1 is in position “0“ and the knife is at the upper turning point, the top edges of the needle plate and knife should be at the same level. Fig. 13 - 36 O Position the adjusting lever 1 to “0“.

  • Page 42: Knife Position

    Adjustment Knife position .06.03 Rule The knife should abut the stationary blade and be positioned slightly diagonally to the stationary knife Fig. 13 - 37 O Turn the eccentric 1 (screw 2) according to the rule.

  • Page 43: Knife Drive Switch

    Adjustment Knife drive switch .06.04 Rule The knife drive off and down position “1“ should be switched on when the adjusting lever 1 is in position “0“ . Fig. 13 - 38 O Position the adjusting lever 1 to “0“. O Turn the lever 2 (screw 3) until the switch 4 is pressed.

  • Page 44: Workpiece Protection Guard

    Adjustment Workpiece protection guard .06.04 Rule The workpiece protection guard 1 should be as close as possible to the knife 3 and abut the stop 4. Fig. 13 - 39 O Adjust the workpiece protection guard 1 (screws 2) according to the rule.

  • Page 45: Adjusting Thread Trimmer -900/24

    Adjustment Adjusting thread trimmer -900/24 Axial control cam position .07.01 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 46: Control Cam (Pre-Calibrating)

    Adjustment Control cam .07.02 (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 - 41 O Turn the control cam 1 (screws 2) according to rule 1 and adjust according to rule 2.

  • Page 47: Thread Catcher Position And Test Cut

    Adjustment Thread catcher position and test cut .07.03 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 - 42 O Turn the connecting rod 1 (nuts 2 left and right-hand thread) according to the rule.

  • Page 48: Control Cam (Recalibrating)

    Adjustment Control cam .07.04 (recalibrating) 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 while turning the handwheel.

  • Page 49: Needle Thread Tension Release

    Adjustment Needle thread tension release .07.05 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 stitch platen, tension should be fully activated.

  • Page 50: Functional Check Of Bobbin Thread Monitor -926/04

    Adjustment Functional check of bobbin thread monitor -926/04 .07.06 Note: Parameters t0602 and t0603 are analogue values that can be adjusted from 0 to 3.300 V. The value 1.650 V corresponds to 50% of the value. Parameter t0602 is the switching threshold of the receiver and parameter t0603 corresponds to the transmitter current, see separate parameter list P40 CD in the “Remaining thread monitor“...

  • Page 51: 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 52 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 53 Notes...
  • Page 54 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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938 u938

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