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1) Stitch length adjustment
1. When the stitch length adjusting window screw is removed, the
lever setscrew can be seen.
o Loosen the lever setscrew to move the lever upwards and fasten
the lever setscrew there. This action increases the stitch length.
o Loosen the lever setscrew to move the lever downwards and
fasten the lever setscrew there. This action decreases the stitch
length.
(Caution) No graduation is available for the adjustment of the
stitch length.
2) Adjustment of differential feed amount
o When the differential adjusting lever is advanced in the reverse
differential direction (1 to 4), the differential ratio is decreased and
the sewed materials are extended.
o When the differential adjusting lever is retreated in the forward
differential direction (6 to 9), the differential ratio is increased and
the sewed materials are shrunk.
* When fixing the differential adjusting lever , pinch it with two
setscrews and .
When the stitch length is changed
o If the forward or backward
movement of the main feed dog
is changed, the contact amount is
also changed between each
needle and the rear needle holder.
Since this can be a cause of stitch
skipping, the rear needle holder
should be readjusted.
Adjustment Procedures Results of Improper Adjustment
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