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20
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Standard Adjustment
Results of lmproper Adjustment
1. To adjust the timing relation between the needle and the looper,
remove the top cover, loosen four setscrews
1
in the sprocket and
turn upper pulley
2
in the state that the sprocket is held.
2. Adjusting procedure
(1) When adjusting the timing to "0" (zero)
1) In case dimension
A
when the looper advances is smaller than
dimension
B
when the looper retreats, the looper timing is retarded
(needle timing is advanced). In this case, loosen setscrews
1
in
the sprocket and finely turn upper pulley
2
in the reverse direction.
2) In case dimension
A
when the looper advances is larger than
dimension
B
when the looper retreats, the looper timing is advanced
(needle timing is retarded). In this case, loosen setscrews
1
in the
sprocket and finely turn upper pulley
2
in the normal direction.
(Caution)
Be careful not to excessively turn upper pulley
2
.
3. After the adjustment, fix four setscrews
1
in the sprocket.
™
When the difference in timing (going
and returning) of looper is excessively
large, stitch skipping or entangling of
needle thread will be caused.
2
1
