–
9
–
Adjustment Procedure
Results of Improper Adjustment
Checking items:
1
Throat plate
2
Setscrew
3
Feed dog
4
Thread sliding segment
* Check that all needles are laterally equidistant with respect to the
throat plate slot (A).
* Check that the distance between the needle center and the front edge
of the throat plate slot is 1.4 mm (B).
* Check to be sure that the lower knife (right end face) is positioned
between the left end and center (C) of the marker dot on throat plate
1
when the lower knife adjustment knob is set at the scale mark 1.
Or, check to be sure that the lower knife (right end face) is spaced 2.5
mm away from the right needle.
How to perform adjustment:
○
Set the thread sliding segment lever in the OFF position.
○
Loosen setscrew
2
. Carry out the adjustment by moving throat plate
1
as described below:
a) The feed dog
3
teeth are parallel to the slots in the throat plate
1
.
b) The needles are spaced equidistantly with respect to the slots in
the throat plate (A).
c) The distance between the needle center and the front edge of the
throat plate
1
slot is 1.4 mm (B).
○
Retighten the setscrews
2
.
○
After the completion of the adjustment, set the thread sliding segment
lever in the ON position to check the parallelism between the throat
plate and thread sliding segment
4
. If they are not in parallel to each
other, carry out adjustment referring to "27. Adjusting the thread
sliding segment".
If the feed dog comes in contact
with the throat plate, abnormal
noise or breakage can be caused.
If the thread sliding segment is
improperly positioned, stitching
failures such that the material is
caught or thread breaks can be
caused.
+ 0.6
- 0.2
+ 0.6
- 0.2
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