69-373 / 69-373H Spezialnaehmaschine Serviceanleitung Service Instructions Manufacturer: Contact: Manufacturer: Contact: Ausgabe / Edition: 02/2008 Dürkopp Adler Manufacturing (Shanghai) Co., Ltd. 1201 Luoshan Road, Pudong New Area, Shanghai 200135, China Dürkopp Adler AG, PO Box 17 03 51, D-33703 Bielefeld, Potsdamerstr. 190, D-33719 Bielefeld, Phone +49 (0) 521 9 25 00, Fax +49 (0) 521 9 25 24 35, www.duerkopp-adler.com Dürkopp Adler Manufacturing (Shanghai) Co., Ltd.
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.
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. Before putting into service also read the safety rules and instructions of the motor supplier. 3. The machine must be used only for the purpose intended. Use of the machine without the safety devices is not permitted.
Contents Service Instructions (Edition 02/2008) Page: Cl. 69-373 Cl. 69-373H 1. 1.1 General Gauge set . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2. 2.1 2.2 2.2.1 2.2.2 2.2.3 2.3 2.4 2.4.1 2.4.2 2.5 Zero position, feeding with sewing equipment Checking the zero position (position of the stitch regulator link) . . . . Setting of the bottom feed . . . . . . . . . . . . . . . . . . . . . . . . . . .
1. General These service instructions describe the adjustments that can be made to the class 69 special sewing machine. 69-373 Single-needle, lockstitch, free-arm sewing machine with bottom feed, needle feed and alternating top feed. 69-373-H like the class 69-373, additionally with bottom feed stroke.
1.1 Gauge set 1 3 2 You can use the setting gauges included in the gauge set to check and adjust accurately the sewing machine. Pos. 4 Setting gauge Order no.
2. Zero position, feeding with sewing equipment 2.1 Checking the zero position (position of the stitch regulator link) 1 2 3 GB Caution: Danger of injury! Turn off the main switch. Check the zero position of the stitch regulator only when the sewing machine is switched off. Rule and control In the zero position of the stitch regulator lever, the feed dog and the needle should not make any advancing motion when the handwheel is moved. – Set the stitch regulator lever 3 to “0”.
Setting of the bottom feed 2.2.1 Position of the feed dog in the throat plate cutout 0,5 mm 2.2 1 2 3 Caution: Danger of injury! Turn off the main switch. Check and set the position of the feed dog only when the sewing machine is switched off. Rule and control Sideways: The feed dog must lie centric in the throat plate cutout. In the feeding direction: At the maximum stitch length, the minimum clearance of the feed dog to the front and rear edges of the throat plate cutout must be approx. 0.5 mm.
2 mm 2.2.2 Advancing movement of the feed dog 1 4 2 5 6 3 7 Caution: Danger of injury! Turn off the main switch. Check and set the advancing movement of the feed dog only when the sewing machine is switched off. GB Rule and control When the stitch regulator lever is operated and set to have the greatest sewing length, both the needle and the feed dog should not move. – Set the stitch regulator lever to “max.”. – Bring the needle bar 1 to the loop stroke position.
2.2.3 3 Lifting movement of the feed dog (only with the class 69-373H) 2 6 1 5 4 Caution: Danger of injury! Turn off the main switch. Check and set the lifting movement of the feed dog only when the sewing machine is switched off. Rule and control In loop stroke position the marking 2 on the toothed wheel 1 should point to the top. – Lift the sewing feet 3. – Pull off the cover 6 to the left. – Unscrew the cover plate 4. – Remove the throat plate 5 and upper feed foot.
12 11 3 – – – – 2 1 Unscrew screws 13. Remove the cover 12 and the dirt wiper 11. The toothed belt 1 is now accessible. Bring the machine into loop stroke position (see chapter 2.2.2). Pull off the toothed wheel 1 and put it on again so that the marking 2 points to the top. GB Reassembling – Reassemble the machine again in inverted sequence. – Set the hook as described in chapter 6.
2.3 Synchronous run of the needle and bottom feed 2 1 Caution: Danger of injury! Turn off the main switch. Check and set the synchronous run only when the sewing machine is switched off. Rule and control The needle must penetrate the middle of the needle hole. – Turn the handwheel in the sense of direction and check the penetration of the needle into the needle hole. Adjustment – Screw off the arm cover. – Loosen screw 2. – Align the needle bar with the rocker 1. – Tighten screw 2 again.
2.4 Setting of the upper feed 2.4.1 Stroke of the upper feed and the material presser foot 1 2 Caution: Danger of injury! Turn off the main switch. Check and set the stroke of the upper feed and the material presser foot only when the sewing machine is switched off. GB Rule and control The stroke of material presser foot and upper feed should be equal. – Check the stroke of the upper feed and material presser foot through turning the handwheel.
2.4.2 Advancing movement of the upper feed foot 1 2 3 Caution: Danger of injury! Turn off the main switch. Check and set the advancing movement of the upper feed foot only when the sewing machine is switched off. Rule and control The upper feed foot should reach the top edge of the feed dog at the same time as the descending needle. – Check the movement of the upper feed foot by turning the handwheel. Adjustment – Loosen screws 1 and 3. – Turn cam 2.
2.5 Stitch regulator (equal stitch length for forward and reverse stitching) 1 A 2 3 B 4 5 6 Caution: Danger of injury! Turn off the main switch. Check and set the stitch uniformity of forward and reverse stitching only when the sewing machine is switched off. GB Rule and control The stitch length for forward and reverse sewing must be equal. Use the special wrench (order no. 0981 160402) from the gauge set to perform the setting. – Turn the butterfly nut 3 against the stop.
3. Sewing foot height and sewing foot lifting 3.1 Sewing foot lift with the lifting lever 2 7 mm 1 3 Caution: Danger of injury! Turn off the main switch. Check and set the height of the mechanically lifted sewing feet only when the sewing machine is switched off. The mechanically lifted sewing feet are arrested in the top position with the lifting lever 3 (for example when winding the bobbin thread or replacing the sewing feet).
3.2 Sewing foot lifting with the knee lever 1 2 3 Caution: Danger of injury! Turn off the main switch. Check and set the height of the sewing feet lifted with the knee lever only when the sewing machine is switched off. GB Rule and control When both feet lie on the throat plate, there should be a clearance of 1 mm between the lifting lever 3 and the presser plate 2. A stop limits the sewing foot lift when the knee lever is pressed completely to the right.
4. Opening the thread tension 3 4 1 mm The needle thread tension is opened mechanically, – when the sewing feet are lifted with the knee lever. Caution: Danger of injury! Turn off the main switch. Check and set the opening of the thread tension only when the sewing machine is switched off. Rule and control Mechanical opening: When the material presser foot is lowered, the clearance between the release plate 3 and the release pin 4 must be approx. 1 mm. – Lower the material presser foot.
4.1 Thread controller spring 4 1 5 2 3 6 Rule and control The thread controller spring 1 must hold the needle thread under slight tension from the highest position of the thread lever to the moment the needle’s eye penetrates the sewing material. The thread controller spring 1 may only touch on the stop when the needle has entered the sewing material up to the eye. Caution: Danger of injury! Turn off the main switch. Check and set the thread controller spring only when the sewing machine is switched off.
5. Needle bar height 2 1 Rule and control In the loop stroke position the hook point 2 should be located in the middle of the needle furrow. Caution: Danger of injury! Turn off the main switch ! Check and set the needle bar height only when the sewing machine is switched off. Adjustment – Bring the needle in the loop stroke position (see Chapter 2.2.2 ). – Screw off the head cover. – Loosen the screw 1. – Adjust the height of the needle bar.
6. Hook settings 6.1 Loop stroke and clearance of the hook point to the needle 0,1 mm 2 3 1 Caution: Danger of injury! Turn off the main switch. Check and set the loop stroke only when the sewing machine is switched off. 4 5 GB Rule and control The loop stroke (2 mm) is the run of the needle bar from the bottom dead center up to the point where the hook point 1 lies at the middle of the needle. Use the block 5 (order no. 0981 150002) and gauge 4 (order no. 0981 150003) to perform the setting.
6.2 Bobbin case holder 1 2 3 Caution: Danger of injury! Turn off the main switch. Set the bobbin case holder only when the sewing machine is switched off. Rule and control The thickest thread that can be used should be able to move easily through the slit between the bobbin case holder 2 and the groove of the lower part of the bobbin case 3. The gap must be approx. 1.5 mm. The bobbin case holder 2 must still hold the lower part of the bobbin case 3 safely against turning.
7. Bobbin winder 1 Rule and control The bobbin winding operation must stop automatically when the bobbin is filled up to approx. 0.5 mm below the edge of the bobbin. GB Caution: Danger of injury! Turn off the main switch. Set the bobbin winder only when the sewing machine is switched off. Adjustment Slight changes in the bobbin fill quantity: – Bend the release lever 1 slightly.
8. Oil lubrication 8.1 General Caution: Danger of injury! Oil can cause skin rashes. Avoid longer skin contact. After contact wash yourself thoroughly. ATTENTION! The handling and disposal of mineral oils is subject to legal constraints. Deliver used oil to an authorized reception point. Protect your environment. Take care not to spill any oil.
8.
9. Maintenance Caution: Danger of injury! Turn off the main switch. You must turn off the special sewing machine before performing maintenance! The maintenance tasks to be conducted by the operating personnel of the special sewing machine daily or weekly (cleaning and oiling) are described in the “Operating Instructions”. They are in the following table only for the sake of completeness.
10. Summary of all sewing machine settings ATTENTION! The complete setting of the special sewing machine is to be made in the order described. No. Subject Chapter Correct setting Adjustment 1 Zero point, feed with devices 2.1 When the stitch length is set to “0”, the feed dog and the needle should not make any advancing motion. Set at the factory. 2.2.1 Sideways: The feed dog must lie centric in the throat plate cutout. Slide the feed dog axially.
No. 9 Subject Sewing foot height and sewing foot lifting Sewing foot lifting with the lifting lever Chapter Correct setting Adjustment 3.1 The distance between the lifted material presser foot and the throat plate must amount 7 mm. Shift the material presser bar When both feet lie on the throat plate, there should be a clearance of 1 mm between the lifting lever and the presser plate. The clearance between the material presser foot and the throat plate should amount 12 mm. Set the adjusting screw.
