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 ­ Turn the machine to the loop stroke position. ­ Adjust the needle guard by turning screw 1. IMPORTANT!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 stitch length to "0". ­ Set the average sewing foot pressure. ­ Set the sewing foot stroke on the adjustment wheel 5 to "3". ­ Put a plate (3 mm) under the sewing feet. ­ 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. ­ Turn the hand wheel to position "0°". ­ Press feeder foot 2 right down onto the throat plate. [. . . ] Press down and hold "P" and switch the main switch on. Turn the potentiometer shaft until speedomat level 07 and the relevant maximum speed of 2800 rpm are displayed on the screen. Check the adjustment. 45 2. 15. 3 Testing the potentiometer adjustment 1 ­ ­ ­ ­ ­ ­ Press down and hold "P" and switch the main switch on. The current speedomat level and the relevant speed limit are displayed. [. . . ]