DURKOPP ADLER 838 Service Instructions Manual
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DURKOPP ADLER 838 Service Instructions Manual

DURKOPP ADLER 838 Service Instructions Manual

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Postfach 17 03 51, D-33703 Bielefeld • Potsdamer Straße 190, D-33719 Bielefeld
Telefon +49 (0) 521 / 9 25-00
Ausgabe / Edition:
Änderungsindex
06/2008
Rev. index: 00.0
Spezialnähmaschine
•
Telefax +49 (0) 521 / 9 25 24 35 • www.duerkopp-adler.com
Printed in Federal Republic of Germany
838
Serviceanleitung

Service Instructions

Teile-Nr./Part.-No.:
0791 838641
D
GB

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  • Page 1: Service Instructions

    Spezialnähmaschine Serviceanleitung Service Instructions Postfach 17 03 51, D-33703 Bielefeld • Potsdamer Straße 190, D-33719 Bielefeld Telefon +49 (0) 521 / 9 25-00 • Telefax +49 (0) 521 / 9 25 24 35 • www.duerkopp-adler.com Ausgabe / Edition: Änderungsindex Teile-Nr./Part.-No.: 06/2008 Rev.
  • Page 2 Alle Rechte vorbehalten. Eigentum der Dürkopp Adler AG und urheberrechtlich geschützt. Jede, auch auszugsweise Wiederverwendung dieser Inhalte ist ohne vorheriges schriftliches Einverständnis der Dürkopp Adler AG verboten. All rights reserved. Property of Dürkopp Adler AG and copyrighted. Reproduction or publication of the content in any manner, even in extracts, without prior written permission of Dürkopp Adler AG, is prohibited.

  • Page 3: General Safety Instructions

    General safety instructions The non-observance of the following safety instructions can cause bodily injuries or damages to the machine. 1. The machine must only be commissioned in full knowledge of the instruction book and operated by persons with appropriate training. 2.

  • Page 5: Table Of Contents

    Contents Page: Service Instructions for the Class 838 (Edition 06/2008) General Setting gauges ..........Adjusting the handwheel .

  • Page 7: General

    General These service instructions describe the adjustments that can be made to the Class 838 special sewing machine. CAUTION! The operations described in these service instructions may only be carried out by qualified staff or other appropriately trained persons! Caution: Risk of Injury! Turn the main switch off for repair, conversion and maintenance work and separate the machine from the pneumatic supply line.

  • Page 8: Adjusting The Handwheel

    Adjusting the handwheel Rule: The handwheel (4) is labelled with degree numbers. Certain adjustments are made with these marked handwheel positions. – Turn the handwheel until the degree value specified in the instructions is aligned with the pointer (3). – Proceed with the adjustment described.

  • Page 9: Bottom Feed

    Lower (bottom) feed Base setting for stitch adjustment and stitch length limit Rules: 1. When setting the stitch length at “0”, the stitch regulator gear should have as little play (clearance) as possible when you press down on the bartacking lever. 2.

  • Page 10: Stitch Uniformity For Forwards And Reverse Stitching

    Stitch uniformity for forwards and reverse stitching Rules: 1. When making a rough-scale adjustment to the stitch regulator gear, the machine should not feed when the stitch length is set to 0. 2. When making a fine-scale adjustment to the stitch regulator gear, the forwards and reverse stitch lengths should only deviate in value by a half stitch.

  • Page 11: Adjusting The Levers On The Rear Feed Shaft

    Adjusting the levers on the rear feed shaft Rule: When setting the stitch length" 0“, the feed clutch should be in the middle range of the work limit settings. – Set the stitch length to “0”. – Loosen screw (1). –...

  • Page 12: Position Of The Eccentric Tappet For The Feed Movement

    Position of the eccentric tappet for the feed movement Rule: When the handwheel pointer indicates 355 degrees, the feed lever (1) should not move when the bartacking lever is pressed down. – Turn the handwheel so that the pointer indicates “355”. –...

  • Page 13: Position Of The Eccentric Tappet And The Feed Dog Stroke

    Position of the eccentric tappet and the feed dog stroke Rule: When the handwheel pointer indicates “239” on the scale, a settings pin inserted into the eccentric tappet should be flush with the ridge on the crankshaft (4). – Turn the handwheel so that the pointer indicates “239”. Loosen screws (1).

  • Page 14: Switching Over The Feed Clutch

    Switching over the feed clutch Rule: The clutch should be switched over when it is motionless (i.e., when it is in the dead centre point of its pendulum motion). – Loosen the screws (1) on the eccentric tappet (2). – Turn the eccentric tappet so that the dash (2) is aligned with the other dash (3).

  • Page 15: Position Of The Eccentric Tappet For The Switch Over Of The Feed Clutch

    Position of the eccentric tappet for the switch over of the feed clutch Rule: When the handwheel pointer indicates “305” on the scale, the dash (1) on the eccentric tappet should be lined up with the lower dash (2) on the V-shaped push rod.

  • Page 16: Checking The Switch Over Of The Feed Clutch

    Checking the switch over of the feed clutch Rule: The feed clutch should be switched over when it is motionless (i.e., when it is in the dead centre point of its pendulum motion). This can be detected from the rotational direction of the belt pulley (1) in front of and behind the dead centre point.

  • Page 17: Feed Dog

    Feed dog Rules: 1. The height (A) that the feed dog (1) is above the throat plate must be appropriate for the thickness and toughness of the material. 2. In its highest position (A), the feed dog should be 1 mm over the throat plate insert.

  • Page 18: Top Feed

    Top feed Positioning the needle holder for single-needle sewing machines Rule: The needle holder positioning is carried out according to the following table and depends on the thickness of the needle. Angularity of the needle holder Needle width, Nm 120 - 160 180 - 200 –...
  • Page 19 For your notes:...

  • Page 20: The Needle Feed

    The needle feed Rules: 1. The needle bar should be adjusted so that it is flush with the presser foot bar. 2. The post bed feed should be: 2.1: for the single-needle machine, it should be set so that the axis of the needle is moved (A) = 0.1mm to the left to the middle of the stitch hole.
  • Page 21 Abb. 1 Abb. 2 – Loosen screw (2) and the two screws (3). Move the post bed feed (4) so that either rule 2.1 is met (A = 0.1 mm) according to Figure 1, or rule 2.2 according to Figure 2.

  • Page 22: Top Roller

    Top roller Rules: 1. The seating area on the top roller holder should be aligned at a right angle to the machine’s longitudinal axis (centre-line). A clearance of (A) = 0 mm should exist between the top roller and the throat plate. 2.

  • Page 23: Lifting The Top Roller

    Lifting the top roller Rules: 1. The top roller should have a 5.4 to 5.6 mm lift from the hand lever. 2. The top roller should have an 11.5 to 12.5 mm (automatic) lift with the pneumatic cylinder. Loosen screws (1). Move the hand lever (2) into the position shown. At the same time, screw in the screw (3) until it hits the lever (4).

  • Page 24: Press Pad For The Double-Needle Sewing Machine

    Press pad for the double-needle sewing machine Rules: 1. The press pad should touch the material without any pressure. 2. The press pad should be positioned so that it is aligned in the sewing direction and laterally along the edge of the stitch holes. –...

  • Page 25: Adjusting The Needle Bar And The Hook Hook Height

    Adjusting the needle bar and the hook Hook height Rule: The clearance distance (A) should be from 1.55 to 1.85 mm. – Loosen screw (1). – Loosen screws (2). Adjust the hook to the clearance (A). Retighten screws (2). – Push the ring (3) until it reaches the end stop on the hook bottom.

  • Page 26: Needle Bar Height, Play Of Needle To Hook Tip, Loop Stroke

    Needle bar height, play of needle to hook tip, loop stroke Rule: When the handwheel pointer indicates “205” degrees (2.5-mm loop stroke), the hook tip should stand at the needle axis at the stitch length 0. Length (A) = 1.5 mm, clearance gap (B) = 0.02 to 0.1 mm. –...

  • Page 27: Protection For The Hook Tip And Loop Former

    Protection for the hook tip and loop former Rules: 1. The loop former (1) should be adjusted so that the clearance to the needle (A) is between 0.1 and 0.2 mm. 2. The guard plate (3) for the hook should prevent the needle from touching the hook tip (4).

  • Page 28: Bobbin Housing Lift

    Bobbin housing lift Rules: 1. When the retention pin (1) in inserted into the lifting cam, the handwheel indicator should point to: - From “305” to “315” for the right hook column - from “42” to “52” for the left hook column. 2.

  • Page 29: Hook Lubrication

    Hook lubrication Rules: 1. There should be a clearance (A) of 0.3 mm between the lubricator (2) and the hook. 2. The lubricator’s regulator screw (3) should project 0.5 mm out of the lubricator. – Loosen screw (1). Adjust the height of the lubricator (2) to the clearance distance (A), according to rule 1.

  • Page 30: Adjusting The Thread

    Adjusting the thread Thread regulator, thread take-up lever, bolt for the thread lever mechanism Rules: 1. The rightmost edge of the thread regulator (1) should align with the number 4 on the scale. 2. The thread take-up lever (5) should be adjusted so that the clearance distance (A) is 10 to 12 mm.

  • Page 31: Bobbin Winder

    Bobbin Winder Rules: 1. When the bobbin winder is turned off, the distance (A) between the winder wheel and the belt pulley should be 0.8 mm. 2. The bobbin winding operation should stop automatically when the bobbin is filled up to approx. 0.5 mm below the edge of the bobbin. –...

  • Page 32: Thread Trimmer

    Thread trimmer Height of the thread trimming knife. Position of the counter-knife Rules: 1. There should be a clearance (A) of 0.2 mm between the thread-pulling knife (5) and the hook. 2. There should be a clearance (B) of 0.3 to 0.5 mm between the counter-knife (6) and the thread-pulling knife (5).

  • Page 33: Starting Position For The Thread Take-Up Knife

    Starting position for the thread take-up knife Rule: When the roller (1) is at the highest point of the control cam (2), the end of the thread take-up knife (3) should overlap the blade of the counter-knife (4) by 0.5 to 1 mm. –...

  • Page 34: Control Cam

    Control cam Rules: 1. There should be a clearance distance (A) = 0.05 to 0.1 mm between the highest point on the control cam (1) and the roller (2). 2. The threads should be separate when the pointer on the handwheel points from “40”...

  • Page 35: Bobbin Thread Clamp

    Bobbin thread clamp Rule: The clamping force of the spring (1) should not be set higher than needed. It should just be able to pull out the lower thread from the hook. Sew and cut the threads. Using a screwdriver (2), inspect the thread according the illustration. Check if the thread is being pulled out of the bobbin winder or from the clamping (1).

  • Page 36: Electronic Control And Machine Drive - Positioning Drive

    Electronic control and machine drive – positioning drive A detailed manual for the positioning drive is enclosed with the machine (also refer to www.efka.net).

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