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7.4.2 Hook thread tension adjustment
Attention! Danger of injury!
Do adjustments when the main switch is switched off and motor
stopped!
The hook thread tension depends on the adjustment of springs (1)
and (2).
Tension spring (1) adjustment
Remove the bobbin case (3) from the machine and insert a
full-wound bobbin (4).
Do a complete
threading according to picture (B).
Regulate the spring (1) pressure with a screw (5) so that the thread
tension is in balance with the case and bobbin weight - when hung
down on the thread end (6), the case is dropping slowly with its
own weight.
Adjustment of bobbin brake spring at the thread trimming (2)
Bobbin braking should be as small as possible because it causes
difference of tensions of full and empty bobbin and subsequently
of thread interlacing in the stitch (defective look of the seam).
Regulate the bobbin braking with a screw (7) and watch the bobbin
unwinding after the thread trimming: remove the case (3) from the
machine, grip it so that the bobbin cannot turn and pull out the
thread end (8). At a correct adjustment, approx. 10 mm of thread
will be pulled out of the case.
16
ABC
732 7 8 461 5
18


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