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Pfaff Industrial 337 Adjustment Manual

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337
ADJUSTMENT MANUAL
This Adjustment Manual is valid for machines
from the following serial numbers onwards:
# 7 207 686
296-12-18 644/002
Justieranleitung engl. 06.09

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Summary of Contents for Pfaff Industrial 337

  • Page 1 ADJUSTMENT MANUAL This Adjustment Manual is valid for machines from the following serial numbers onwards: # 7 207 686 296-12-18 644/002 Justieranleitung engl. 06.09...
  • 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: Notes On Adjustment

    Adjustment Adjustment Notes on adjustment All adjustments in this instruction manual refer to a completely assembled machine and appropriately trained technical personnel appropriately trained technical personnel must only be carried out by appropriately trained technical personnel appropriately trained technical personnel appropriately trained technical personnel.

  • Page 4: Adjusting The Basic Machine

    Adjustment Adjusting the basic machine Position of the bottom feed dog crosswise to sewing direction .04.01 Requirement The bottom feed dog 1 must clear the feed slot by the same amount at the left and right. Fig. 11 - 01 Re-position feed dog 1 (screws 2) according to Requirement.

  • Page 5: Adjusting The Bottom Feed Dog In Sewing Direction

    Adjustment Adjusting the bottom feed dog in sewing direction .04.02 Requirement With the longest stitch length set, bottom feed dog 5 must clear the feed slot by the same amount at the front and rear end of its stroke. Fig. 11 - 02 Set the longest stitch length.

  • Page 6: Needle Position In Needle Hole

    Adjustment Needle position in needle hole .04.03 Requirement 1. In sewing direction the needle centre must be at a distance of approx. 0.7 mm from the front inside edge of the needle hole. 2. Crosswise to sewing direction the needle must be centred in the needle hole. Fig.

  • Page 7: Needle Height (Preliminary Adjustment)

    Adjustment Needle height (preliminary adjustment) .04.04 Requirement With the needle bar at b.d.c. the clearance between needle bar and needle plate must be 15 mm. Fig. 11 - 04 Position the height of needle bar 1 (screws 2) according to Requirement, but do not turn it. 11 - 5...
  • Page 8 Adjustment Top-feed pendulum .04.05 Requirement At stitch length ”0” and the largest gather setting, presser bar 4 must be at the centre between needle bar guide and presser bar. Fig. 11 - 05 Push linkage rod 1 (screw 2) fully up in its slot 3. Set stitch length at ”0”...
  • Page 9 Adjustment Feeding stroke of top and bottom feeds .04.06 Requirement When the lower edge of the descending needle bar is 33 mm above the top edge of the needle plate, the top and bottom feeds should not move when the stitch length adjustment lever is activated.

  • Page 10: Top Feed Stroke

    Adjustment Top feed stroke .04.07 Requirement When lever 1 is in the middle of its slot, vibrating presser 3 and lifting presser 4 must be at the same height above the needle plate. Fig. 11 - 07 Set stitch length at ”0” Set lever 1 (screw 2) at the middle of its slot.

  • Page 11: Top Feed Lifting Motion

    Adjustment Top feed lifting motion .04.08 Requirement When the lower edge of the descending needle bar is 33 mm above the top edge of the needle plate, the top feed should not move, when the slotted lever 3 is moving up and down. Fig.

  • Page 12: Hook Clearance, Needle Rise And Needle Height

    Adjustment Hook clearance, needle rise and needle height .04.09 Requirement With the longest stitch length set and in needle-rise position (= 1.8 mm past b.d.c. of the needle bar) 1. The hook point must be at”needle centre” and the clearance between hook and needle 0.05 to 0.1 mm, and 2.

  • Page 13: Needle-Thread Tension Release

    Adjustment Needle-thread tension release .04.10 Requirement With the lifting presser raised, there must be a clearance of at least 0.5 mm between tension discs 4. 0.5 mm Fig. 11 - 10 Raise the lifting presser. Position pressure plate 1 behind mounting bracket 2 according to Requirement. When the tension is engaged, release pin 3 must not be under load.

  • Page 14: Thread Check Spring

    Adjustment Thread check spring .04.11 Requirement The movement of thread check spring 5 must be finished when the needle point enters the material (= = = = = spring stroke of about 7 mm). Fig. 11 - 11 Adjust stop 1 (screw 2) according to Requirement. To adjust the pressure of the spring, turn screw 3 (screw 4).

  • Page 15: Bobbin Winder

    Adjustment Bobbin winder .04.12 Requirement 1. With the bobbin winder engaged, friction wheel 5 must be driven reliably. 2. With the bobbin winder disengaged, friction wheel 5 must not run against drive wheel 1. 3. The bobbin winder must switch itself off when the filled thread is about 1 mm from the rim of the bobbin.

  • Page 16: Pressure Of The Lifting Presser

    Adjustment Pressure of the lifting presser .04.13 Requirement The material must be properly fed, even at the highest sewing speed. Fig. 11 - 13 Turn screw 1 according to the Requirement. 11 - 14...

  • Page 17: Control Cam (Preliminary Adjustment)

    Adjustment Adjusting the thread trimmer –900/56 Control cam (preliminary adjustment) .05.01 Requirement With the needle bar at b.d.c., groove 4 of control cam 2 must be vertically below control pin 5. Fig. 11 - 14 Loosen screws 1 through the hole in the machine housing. Set the take-up lever at b.d.c.

  • Page 18: Control Lever Height

    Adjustment Control lever height .05.02 Requirement With the needle bar at b.d.c. there must be a clearance of 1.0 mm between control lever 3 and control cam 4. Fig. 11 - 15 Set the needle bar at b.d.c. Position bracket 1 (screws 2) of control lever 3 in the elongated hole according to Requirement.

  • Page 19: Control Pin

    Adjustment Control pin .05.03 Requirement With the needle bar at b.d.c. control pin 5 must drop easily into the track of control cam 7 when engaging solenoid 6 is operated. Fig. 11 - 16 Set the needle bar at b.d.c. Operate the solenoid core by hand.

  • Page 20: Engaging Solenoid

    Adjustment Engaging solenoid .05.04 Requirement With the needle bar at b.d.c. and solenoid core 1 fully operated there must be a clearance of approx. 0.5 mm between locking pawl 7 and fixing collar 6. 0.5 mm Fig. 11 - 17 Set the needle bar at b.d.c.

  • Page 21: Control Pin Height

    Adjustment Control pin height .05.05 Requirement With the thread trimmer in its resting position and locking pawl 4 4 4 4 4 engaged there must be a clearance of 0.3 mm 0.3 mm 0.3 mm 0.3 mm 0.3 mm between the highest point of control cam 5 5 5 5 5 and control pin 6 6 6 6 6 . Fig.

  • Page 22: Front Position Of Thread Catcher

    Adjustment Front position of thread catcher .05.06 Requirement With thread catcher 3 at its front position the back edge of the thread catcher cutout must be 1 mm beyond the front edge of bobbin case position stop 6. Fig. 11 - 19 Set the needle bar at b.d.c.

  • Page 23: Lateral Position Of Thread Catcher

    Adjustment Lateral position of thread catcher .05.07 Requirement With the needle bar at b.d.c. the point of thread catcher 4 must be at the centre of the needle. Fig. 11 - 20 Remove knife 1 (screws 2). Set the needle bar at b.d.c. Operate solenoid core 3 by hand and turn the balance wheel until the needle bar is at t.d.c.

  • Page 24: Control Cam (Final Adjustment)

    Adjustment Control cam (final adjustment) .05.08 Requirement When the end of hook gib 2 is 2 mm behind the centre of bobbin-case position finger 3, as viewed in feeding direction, there must be a clearance of approx. 4 mm approx. 4 mm approx.
  • Page 25 Adjustment Knife .05.09 Requirement When the back edge of the thread catcher cutout is 1 mm in front of the knife edge, the left knife edge must be flush with the edge of the thread catcher. Fig. 11 - 22 Screw on knife 1 (screws 2) finger-tight.
  • Page 26 Adjustment Needle thread tension release .05.10 Requirement When the tip of release lever 5 is at the highest point of release cam 4 the tension discs must be at least 0.5 mm apart. 0.5 mm Fig. 11 - 23 Lower the lifting presser onto the needle plate. Set the needle bar at b.d.c.

  • Page 27: Cutting Test

    Adjustment Cutting test .05.11 Requirement The knife must stand parallel to the thread catcher and both threads must be reliably cut. Fig. 11 - 24 Set the needle bar at b.d.c. and operate solenoid core 1. Turn balance wheel (sewing direction) until thread catcher 2 is in its front position. Take a double piece of thread, pull it into the cutout of thread catcher 2 and turn the balance wheel farther to make a cutting test.

  • Page 28: Adjusting The Synchronizer

    Adjustment Adjusting the synchronizer 05.12 Requirement 1. On a seam interruption the machine must position 4 mm past b.d.c. 2. After a thread trim the machine must position at t.d.c. of the take-up lever. Carry out adjustment according to motor instruction manual. 11 - 26...
  • Page 29 Notes...
  • Page 30 PFAFF Industriesysteme und Maschinen AG Hans-Geiger-Str. 12 - IG Nord D-67661 Kaiserslautern Telefon: +49 - 6301 3205 - 0 Telefax: +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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