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13
Bobbin thread clamp spring
.05.13
Rule
1. There should be a clearance of 0.3 mm between the clamp spring 5 and the
underside of the thread catcher 4.
2.
The tips of the clamp spring 5 should be fl ush with the back edge of the thread
catcher 4 when the thread catcher 4 is in the front turning point (see arrow).
3.
There should be a clearance of approx.
12 mm between the inner edge of the clamp spring 5 and the guide bushing 7.
4.
It should be easy to insert and remove the bobbin case from the hook.
5
Fig. 13 - 24
● Align the bracket 1 (screws 2) so that it is parallel to the machine bed plate and is posi-
tioned in the centre of its range.
● Remove the spring 3.
● Swivel the thread catcher 4 by hand over the clamp spring 5.
● Bend the clamp spring according to rule 1.
● Insert the spring 3.
● Move the machine to the needle rise position, activate the engaging lever and move the
thread catcher to its front turning point by turning the handwheel.
● Align the clamp spring 5 (screws 6) - and the bracket 1 (screws 2) in the elongated hole if
necessary - according to rules 2 and 3.
● Tighten the screws 2 and 6 in this position, ensuring that the bracket 1 is still parallel to
the machine bed plate.
6
1
7
4
Check the height of the spring below the bobbin in the hook
if you have sewing problems after trimming the thread!
The height of the spring should be approx. 1 mm.
2
4
3
Adjustment
5
1 mm
29
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