Adjust Bobbin Thread Tension - Duerkopp Adler 530 Operating Instructions Manual

7.7 Adjust bobbin thread tension

14
Caution: Danger of injury !
Switch off main switch !
Adjust bobbin thread tension only when the button sewing automat
is switched off.
The required bobbin thread tension is to be produced by tension
spring 1. The top of bobbin case 3 should drop slowly due to its own
weight when being held at the threaded-in bobbin thread.
Adjust tension spring
–
Remove top of bobbin case 3 with the bobbin.
–
Adjust tension spring 1 at the regulating screw 2 until the required
tension value is reached.
–
Reinsert top of bobbin case.
1
2
3