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Trouble
Cause (1)
Cause (2)
Check and corrective measures
From the previous page
The influence of thread tightness by a thread
take-up and a feed dog is reduced by using
small presser with a clearance groove.
Presser asm.
Part No. D1524555DBA (Small clearance groove)
Part No. B1524012TBO (No clearance groove)
Clearance
groove
Width of
a needle-
entry
portion
2. Uneven material feed
The upper and lower cloths are
not evenly fed.
2-1) Feeding is inappropriate.
1-A) The feed dog is too high.
Lower the height of the feed dog (MS : 0.8
mm, SH : 1.2 mm) or increase the pressure to
prevent the material from jumping.
1-B) The feed trace is inappropriate.
Adjust the timing of the vertical feed cam with
reference to "3.-(3) Operating timing of the
feed".
1-C) The top edges of the feed dog
teeth are worn.
Sharpen the top edges.
1-D) The feed dog pitch is too large.
Use one with a smaller pitch.
1-E) The tilt of the feed dog is not
correct.
Set the feed dog with its front down.
1-F) The feed timing is too late.
Adjust the feed timing to the standard timing.
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