12. Adjusting the looping stroke
Caution: Danger of injury !
Switchthemainswitchoff.
Adjust the looping stroke only with the machine switched off.
Standard checking
The looping stroke is the way of the needle bar from its lowest position
up to the point where the left or right hook tip is at the level of the
middle of the needle.
The looping stroke is 2.7 mm.
–
Turn the handwheel in rotation direction until the needle is in the
bottom dead centre.
–
Measure the distance between the edge 1 and the top edge of
needle bar 2 with a slide gauge.
–
Scale down the measurement on the slide gauge by 2.7 mm.
–
Put the slide gauge with the scaled-down measurement on the
edge 1.
–
Slowly continue turning the handwheel in rotation direction until the
needle bar hits the slide gauge.
The needle bar is in looping stroke position.
–
Check whether the hook tip is at the level of the middle of the
needle (see illustration on the left).
–
Repeat the same procedure with the second hook.
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