Bobbin-Thread-Tensioning Spring - Duerkopp Adler 579 Operating Instructions Manual

4.2

Bobbin-thread-tensioning spring

Caution: danger of injury
The thread-tensioning spring may only be adjusted with the machine
switched off or in the firm hold position.
The deflection and pre-tensioning force of the thread-tensioning spring
1 affect the bobbin-thread tension and thus the shape and purling of
the buttonhole.
Adjusting the deflection:
Undo screw 2.
–
Twist bracket 3.
–
Tighten screw 2.
–
Adjusting the pre-tension:
Undo screw 5.
–
Twist bracket 4.
–
Tighten screw 5.
–
1
2
3
4
5
1
17