Adjustment
33
15.06.06 Bobbin thread retaining spring
Requirement
1. The bobbin thread clamp spring should be guided reliably in the thread groove of the thread
catcher 3.
2. The tension of the bobbin thread spring clamp should be as low as possible, but the bobbin
thread should be held reliably after the cutting operation.
● Adjust bobbin thread clamp spring 1 (screws 2) in accordance with requirement 1.
● Adjust the tension in accordance with requirement 2 by bending side 4 of the bobbinth-
read clamp spring 1.
● Control - requirement 1
● Switch off the machine and bring the take-up lever to its b.d.c.
● Engage and disengage the thread catcher 3 by hand and check requirement 1. Adju-
st ifnecessary.
● Control - requirement 2
● After the thread has been cut, sew a few stitches by turning the balance wheel, checking-
whether the bobbin thread is drawn out of the bobbin thread clamp spring between the1st
and 3rd stitches. If necessary, correct the tension.
Fig. 15 - 28
3
4
1
2
1
3
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