28
The thread take-up-spring
Requirements
The thread take-up spring (6/42) should be able to
move freely in the groove of the adjustment casing
and be strong enough to take up the thread.
Adjustment
The strength of the thread take-up spring changes
if the rear part is shifted to another hole in the sleeve (6/41).
The adjustment casing
Requirements
The casing (6/41) should be so set that the
thread take-up spring has finished its
movement when the needle eye reaches
the fabric, after a completed stitch. Check
by sewing on thin fabric.
Adjustment
The stop in the adjustment casing, i.e. the
limitation of the movement of the spring,
can be adjusted by means of a screwdriver,
which should be applied at A.
The thread tension of the
bobbin case
Requirements
The thread tension spring of the bobbin case shall give a
thread resistance of 20-24 g when pulling the thread slowly.
Adjustment
Remove any loose pieces of thread or fluff which may have
collected under the thread tension spring. The thread
tension can be tested by using at test part with a
weight of 22.9 g, e.g. a seam former. Attach
the thread to the test part and hold the bobbin
case, letting the thread hang vertically in the
direction of the bobbin case finger. If the thread
tension is correctly set, the weight of the test part
should pull the thread slowly from the bobbin case.
Adjustment of the tension is done by means of screw (9/36).
Comments
If the bobbin case spring is subjected to an abnormal
load (e.g. when pulling the thread) it may be damaged,
thus making adjustment impossible. If this is the case,
the bobbin case must be exchanged.
Spare part: Bobbin case 401 1530-02.
To Next Page
Loading...
Need help?
General
