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7. Fxmction of thread trimming.
The button clamp-lifting rod will drive the crank of thread trimming shaft, and the
motion of thread trimmer will cut inside thread. Adjust the position of hanger
crank(P25-i.5B4), make thread trimmer cut thread first, then lift button clamp. Or if the
button clamp is lifting while the trimming knife fails to reach the trimming position,
the thread will break and the stitches easily tend to loose.
8. Shift cam unit, (model 1375A3)
Open the hinged cover, you can see the
shift cam unit (as shown in Figl5), which
is designed for model 1375A3, and is
used to shift crossover stitches and
parallel stitches. The position which the
illustration shows is suitable to crossover
stitches. If you need parallel stitches, you
can loose screw (1), pull out the handle
(2), make the wheel (3) well touch with
profile of the shift cam, and then tight the