19. Adjusting the needle thread knife
Caution: Danger of injury !
Switchthemainswitchoff.
Adjust the needle thread knife only with the machine switched off.
Standard checking
The cutting motion of the needle thread knife 2 is effected after sewing.
The exact cutting moment is fixed in the control.
When in final position the knife holder 3 must not touch the spreader
stop 1.
The needle thread knife should cut through the needle thread loop
taken up from the right hook at the hook front 5 only. If the needle
thread loop is cut through on both sides, this results in a too short
thread end and thus in skipped stitches at the seam beginning.
In the right final position the needle thread knife must neither be in the
thread zone nor touch the spreader stop.
There must be a distance of approx. 0.2 mm between needle and knife.
In cut-off position the knife must move approx. 1 mm beyond the
edge 4.
–
Move the knife manually and check whether all rules mentioned
above are kept.
43
32 1
5
0,2 mm
4
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