20 BA_310D-R_3100D-R_A16-3_180117_en
Fig. 9
4.5 Thread tensioning (Fig. 6)
Dependent on grade, characteristic and thickness of the thread as well as the
sewing material, the thread tensioning is adjusted to the required seam diagram
with the tensioning nut (3).
4.5.1 Thread tightening spring – needle thread (Fig. 10)
The tension of the rotary spring (1) can be modified after releasing the grub
screw (2) and by turning at the headed bolt (3). It starts to tension the thread
when the thread loop is approx. 15° in front of the upper point of the hook, that
is, before it can fall off to the right of the hook.
Fig. 10
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