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21
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Adjustment Procedure
Results of Improper Adjustment
Checking items:
❶
Front end of feed dog
* Adjust the stitch length to 2.5 mm. Set the dierential feed ratio at "N".
Bring the sub feed dog to its highest position. At this time, check that
the height of foremost section
❶
of the sub feed dog with respect to
the top surface of the throat plate is 1.3 mm (A).
How to perform adjustment:
○
Set the feed dog in its highest position.
○
Loosen the setscrew (B) from the eccentric stud (C).
○
Turn the eccentric stud (C) to perform adjustment.
○
Retighten the setscrew (B).
○
If the sub feed dog height is
larger than the standard ad-
justment value, the needle can
sway or break when sewing a
heavy-weight material. In addi-
tion, the feed dog marks can
be left on the material or puck-
ering is likely to occur when
sewing a light-weight material.
○
If the sub feed dog height is
smaller than the standard ad-
justment value, the eciency
of feed can be reduced.
○
If the sub feed dog is po-
sitioned too high, chain-o
thread can be excessively
tensed.
○
If the height of the main feed
dog and that of the sub feed
dog are not equal, the ex-
pected dierential feed eect
cannot be achieved.
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