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Trouble Cause (1) Cause (2) Check and corrective measures
From the previous page
The inuence 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. D1524-555-DBA
(Small clearance groove)
Part No. D1524-012-TBO
(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 (1.0 mm for
standard size, 1.3 mm for SSH and FSH) 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) Feed trace and phase.
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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