Adjustment Of The Inner Rotary Hook (Lower Thread) Tension - promelectroavtomat XL2120 Service Manual

Adjustment

20.Adjustment of the Inner Rotary Hook (Lower Thread) Tension

1 Set a bobbin (wound with a schappe spun sewing thread # 60) in the inner rotary hook and put a thread
through.
2 Adjust the tightening amount of the spring tension adjusting screw so that the thread tension is 0.10 to 0.12 N
(10 to 12 g) when pulled slowly using a tension gauge.
Shapesupan thread #60
3 - 20
Spring adjusting screws
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0.1 - 0.12N
(10 - 12g)