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53
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Troubles
Cause (1)
Cause (2)
Checking orders and corrective measures
From the previous page
Places related to the hook are defective.
Thread path is defective
Bobbin or bobbin case is defective.
Feed is defective.
Hook timing is too early.
Hook timing is too late.
Clearance between hook and bobbin case
holder is small.
Amount of oil in the hook is small.
Hook is defective (Thread is caught in the
hook.)
Thread path is not smooth.
There is a scratch in the thread path.
There is a burr in the thread path.
Bobbin thread is caught in the bobbin case
due to improper engagement of bobbin with
bobbin case.
Bobbin thread is caught in the bobbin since
thread is improperly wound round the
bobbin.
Tension adjusting spring of bobbin case is
defective.
Bobbin thread in the bobbin case runs idle.
There is a scratch in the bobbin.
Feed timing is improper, or feed dog height
is low.
For cotton thread and spun thread, adjust the timing to the
standard, or slightly delay the timing.
For filament thread, adjust the timing to the standard, or slightly
advance the timing.
Increase the clearance to improve the slide of thread.
Properly adjust the amount of oil.
Replace the hook.
Finish the thread path.
Finish the thread path.
Correct threading.
Replace the bobbin or bobbin case.
Adjust the tension or position of bobbin winder thread tension. In
addition, take care of uneven winding.
Replace the bobbin case.
Adjust the pressure of idle-prevention spring referring to the item
(7).
Correct the burr of scratched part, or replace the bobbin.
Slightly delay the feed timing. (Cotton thread and spun thread)
Or, advance the timing. (Filament thread)
Raise the heigt of feed dog.
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