6.7 Pre-setting the looper-thread tension
Caution: danger of injury
Turn off the main switch.
The looper-thread tension may only be adjusted with the machine
switched off.
Braking spring
The braking spring 1 prevents the bobbin from running on when the
machine halts and when the looper thread is severed and cannot be
adjusted!
Setting the tension spring
–
When the bobbin is full the top of the bobbin housing 2 should
gradually descend under its own weight (see right-hand
illustration).
–
Adjust the tension spring 4 with the regulating screw 3 until the
required tension is reached.
15
1
2
4
3
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