3 - 20
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.
0.1 - 0.12N
(10 - 12g)
Shapesupan thread #60
Spring adjusting screws
www.promelectroavtomat.ru