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15
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Adjustment Procedure
Results of Improper Adjustment
Checking items:
1
Main feed dog
2
Sub feed dog
3
Throat plate
* Adjust the stitch length to 4 mm.
* Set the differential feed ratio at "N".
* Turn the handwheel to move the feed dog up and down. Measure the
clearance provided between main feed dog
1
and sub feed dog
2
when the tip of feed dog teeth is aligned with the top surface of throat
plate
3
both in the ascending and descending operations. The differ-
ence between these two measurement values (A - A') has to be 0 ± 0.1
mm.
How to perform adjustment:
○
Loosen the setscrew (B) of the eccentric stud (C).
○
Turn the eccentric stud (C) to perform adjustment.
○
Retighten the setscrew (B).
If the difference in the aforemen-
tioned clearances deviates from
the standard adjustment, the stitch
length in the actual sewing will dif-
fer from the indicated stitch length
shown on the knob.
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