12. Adjusting the loop stroke
Caution: Danger of injury !
Turnthemainswitchoff.
Adjust the loop stroke only with the machine switched off.
Standard checking
The loop stroke is the way of the needle bar from its lowest
position up to the point where the left or right looper tip is at
the level of the middle of the needle.
The loop 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 vernier caliper.
–
Scale down the dimension on the vernier caliper by 2.7 mm.
–
Put the vernier caliper with the scaled-down dimension
on the edge 1.
–
Slowly continue turning the handwheel in rotation direction
until the needle bar hits the vernier caliper.
The needle bar is in loop stroke position.
–
Check whether the looper tip is at the level of the middle
of the needle (see illustration on the left).
–
Repeat the same procedure with the second looper.
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