User manual DURKOPP 869 SERVICE INSTRUCTIONS

[. . . ] 869 Spezialnähmaschine Serviceanleitung Service Instructions D GB 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: 04/2010 Änderungsindex Rev. index: 00. 0 Printed in Federal Republic of Germany Teile-Nr. /Part. -No. : 0791 869641 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. [. . . ] Correction ­ Check whether the needle is being pushed away from the hook guard 6 in the loop stroke position. If the needle is being pushed away the needle guard must be reset accordingly (see chapter 2. 6. 4). The distance between the needle 4 and the hook should be no more than 0. 1mm. ­ Place the bevel gear 5 so close that the hook has even less radial play inside the bevel gears. ­ Replace screws on the bevel gear 5. 5 6 22 2. 6. 4 Needle guard 2 1 Caution: Danger of injury!Only check and adjust the needle guard when the machine is switched off. GB Standard checking The needle guard 2 should prevent the needle touching the hook tip. In the loop stroke position the needle should be pushed away slightly. The needle guard must be adjusted after a change in the needle bar height, after adjusting the loop stroke and after changing the needle thickness. 23 2. 7 Bobbin housing elevator 2. 7. 1 General The thread lever must draw the thread between the bobbin housing and its retainer. So that the thread can slip through unhindered, the bobbin housing must be raised at this time. As a result the required seam construction is achieved with the lowest possible thread tension. Incorrect settings may have the following effects: ­ Thread breaking ­ Loops on the underside of the seam ­ Loud noises 2. 7. 2 Bobbin housing elevator path 1 3 2 Caution: Danger of injury!Only check and adjust the bobbin housing elevator when the machine is switched off. Standard checking The bobbin housing elevator 3 should raise the middle part of the hook 2 so that the sewing thread can slip through unhindered between the bobbin housing lug and the throat plate recess. The elevation gap X depends on the thickness of the thread to be sewn. ­ Turn the hand wheel and check whether the bobbin housing elevator opens the bobbin housing far enough. 24 2 1 Correction ­ Turn eccentric bolt 2. The eccentric bolt 2 is held by the grub screw 1 and a plastic pressure piece. ­ The frictional force can be changed with grub screw 2 when the hook bearing is removed. GB 2. 7. 3 Elevation time The time of elevation is firmly preset by the eccentric on the hook and cannot be changed. 25 2. 8 Feed foot and material presser foot 2. 8. 1 Feed foot and material presser foot stroke 2 1 3 Caution: Danger of injury!Only check and adjust the sewing feet stroke when the machine is switched off. Standard checking The strokes of the two sewing feet should be the same height when the adjustment wheel 5 for the sewing foot stroke setting is set to "3". ­ Set the sewing foot stroke on the adjustment wheel 5 to "3". ­ Turn the hand wheel and compare the strokes of sewing feet 1 and 2. The stroke of the material presser foot 1 and the feed foot 2 should be the same height. 5 Correction ­ Unscrew the arm cover. [. . . ] Important The eccentric cut of the thread draw cutter 2 automatically produces a cutting pressure when both cutting edges are on top of each other. 41 To adjust the bobbin thread clamp 5 ­ ­ Unscrew bar 5. Clockwise = clamping force higher Anti-clockwise = clamping force lower Screw bar 5 on again. 6 ­ 42 2. 14. 5 Cutting position 1 Caution: Danger of injury!Only check and adjust the cutting position when the machine is switched off. Standard checking If the machine is at position 58° on the hand wheel the threads must be cut. [. . . ]