Adjustment
12 - 27
87-049
12
.05.06
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 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
st
and 3
rd
stitches. If necessary, correct the tension.
63-034
2
1
3
63-035
1
4
3
Fig. 12 - 25
Summary of Contents for 3734-12
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Page 84: ...14 3 General plan circuit diagrams Version 25 08 05 91 191 442 95 Part 2...
Page 85: ...14 4 91 191 492 95 Part 3 Version 25 08 05 General plan circuit diagrams...
Page 86: ...14 5 General plan circuit diagrams Version 25 08 05 91 191 442 95 Part 4...
Page 87: ...Notice...