22. Short trimmer for lower thread (580-112000, 580-312000)
22.1 Function sequence
After the seam end the cutting motion of the needle thread knife is
effected.
At the same time the short-trimmer is brought to the initial position
(fig. B) for trimming the lower thread (looper thread). The lower thread
glides in front of the edge of knife 1.
Afterwards the short-trimmer is switched back (fig. A).
By switching back the lower thread is clamped and cut. In order to
guarantee that the lower thread is safely clamped at the seam
beginning the spring must press the knife against the knife plate.
The clamping pressure has to be set in such a way that the lower
thread is safely held. If the clamping pressure is too high, the stitches
at the seam beginning are too tight.
3
59
A
B
1
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