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Adjustment Procedures
1) Stitch length adjustment
1. When the stitch length adjusting window screw
lever setscrew
can be seen.
o Loosen the lever setscrew
the lever setscrew
o Loosen the lever setscrew
fasten the lever setscrew
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
differential direction (1 to 4), the differential ratio is decreased and
the sewed materials are extended.
o When the differential adjusting lever
differential direction (6 to 9), the differential ratio is increased and
the sewed materials are shrunk.
* When fixing the differential adjusting lever
setscrews
and
to move the lever upwards and fasten
there. This action increases the stitch length.
to move the lever downwards and
there. This action decreases the stitch
is advanced in the reverse
is retreated in the forward
.
Results of Improper Adjustment
When the stitch length is changed
is removed, the
o If the forward or backward
, pinch it with two
– 29 –
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.
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