Instruction manual

GB
Contents Page:
Preface and general safety instructions
Part 1: Operating instructions - Class 838
(Edition 10/2008)
1. Product description ............................................ 5
2. Designated use ............................................... 5
3. Subclasses and sew ing equipment
3.1 Subclasses.................................................. 6
3.2 Sewing equipment ............................................. 6
4. Optional equipment ............................................ 7
5. Technical data
5.1 Class-specifictechnicaldata ....................................... 8
5.2 Subclass-specifictechnicaldata..................................... 8
6. Operations
6.1 Threading the needle thread ....................................... 9
6.2 Winding on the hook thread ........................................ 10
6.3 Changing the hook thread bobbin .................................... 10
6.4 Adjustingthethreadtension ....................................... 11
6.4.1 Adjusting the hook thread tension .................................... 11
6.4.2 Adjusting the needle thread tension ................................... 12
6.5 Switching the thread tensioners on/off ................................. 13
6.5.1 The functioning of the main thread tension and the s upplementary thread tension
inrelationtothesewingfootlift...................................... 14
6.6 Adjusting the thread regulator ...................................... 14
6.7 Changing the needle for single-needle machines ........................... 15
6.8 Changing the needle for double-needle machines .......................... 16
6.9 Liftingandfoldingthetoproller...................................... 17
6.10 Sewingfootpressure............................................ 18
6.11 Sewinginreverse(back-tacking) .................................... 19
6.12 Adjusting the stitch length ......................................... 20
6.13 Engaging the safety clutch for hook blockages............................. 21
6.14 Operatingthemachinewiththepositioningdrive ........................... 23
6.14.1 With the pedal ................................................ 23
6.14.2 With the buttons (key panel) ....................................... 24
7. Positioning drive on the Efka DC 1550/DA321G .......................... 25
8. Sew ing on a machine w ith positioning drive
8.1 Automaticmachinefunctions ....................................... 26
8.2 Example - operating the machine while sewing ............................ 27