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23
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Adjustment Procedure
Results of Improper Adjustment
Checking items:
❶
Right hand needle
❷
Throat plate
❸
Sub feed dog
* Adjust the stitch length to 2.5 mm. Set the dierential feed ratio at "N".
When sub feed dog
❸
and right needle
❶
go up, check that the tip of
right needle
❶
and tip of the teeth of sub feed dog
❸
are simultane-
ously aligned with the top surface of throat plate
❷
.
How to perform adjustment:
○
Loosen the setscrews (A).
○
Rotate the feed excenter cam (B) to make adjustment.
○
Retighten the setscrews (A).
If this timing is not properly adjust-
ed, needle breakage, puckering
and incorrect feed amount can be
caused.
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