Strobel 3200D series, Operating Instructions Manual

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BA_3200D_A1_140203_en
Fig. 8
4.4
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 279.0624.
Thread tensioning (Fig. 6)
4.4.1
The tension of the rotary spring 163.0008 can be modified after releasing the
grub screw 176.0406 and by turning at the headed bolt 136.0010. 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.
Thread tightening spring – needle thread (Fig. 9)
Fig. 9
4.4.2
The leaf spring 163.0021 regulates the reel thread tension.
By turning the flat head screw with the catch 177.0204, the leaf spring must be
able to be adjusted in such a way that when the reel is inserted and the thread
is pulled underneath the leaf spring correctly and then the reel capsule is
released, the reel capsule together with the reel falls slowly down, or by slight
pulling at the thread.
Thread tensioning – reel thread (Fig. 10)