Operating instructions

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.