3.4 Thread pulling spring
Rule and control
The thread pulling spring 1 should hold the needle thread tensioned at
least until the tip of the needle stitches into the fabric.
Caution: Danger of bodily injuries !
Turn off main switch.
Switch off the sewing machine before correcting the thread pulling
spring.
Correction: Spring travel
–
Loosen the screw 4 by the hexagon spanner (spanner opening
2,5 mm).
–
Turn the bush 3.
The spring 1 should hold the needle thread tensioned at least until
the tip of the needle stitches into the fabric
–
Retighten the screw 4.
Correction: Spring force
–
Loosen the screw 5 by the hexagonal spanner (spanner opening
2.5 mm).
–
Set the tension value by turning the tension bolt 2
.
The tension of the thread tension spring must range between 20
and 50 cN ( 1 cN = 1 g ), depending on the type of fabric and
thread.
–
Retighten the screw 5.
1
2
3
4
5
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