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 "Safe Stop" 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