Bobbin Thread Retaining Spring - Pfaff 3734 -12 Instruction Manual

12

Bobbin thread retaining spring

.05.06
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 bob-
bin thread should be held reliably after the cutting operation.
Fig. 12 - 24
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 bobbin
thread 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. Adjust if
necessary.
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 the 1
and 3 rd
4
stitches. If necessary, correct the tension.
3
3
1
Adjustment
2
1
st
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