Adjusting The Bobbin Thread Tension - Duerkopp Adler 511 Operating Instructions Manual

7.7

Adjusting the bobbin thread tension

Caution – Risk of Injury !
Turn the main switch off.
Adjust the bobbin thread tension only when the automatic bartacker is
switched off.
The required bobbin thread tension should be generated 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.
Setting the tension spring
–
Take off 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 the bobbin case.
1
2
3
1
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