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Trouble
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3-3) The stroke of the thread take-
up lever is too long.
3-4) The stroke of the thread take-
up lever is too long.
3-5) The matters related to the
hook are inappropriate.
3-6) The thread path is defective.
3-7) The bobbin or bobbin case is
defective.
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Cause (1)
5-A) The timing of the hook is too
early.
5-B) The timing of the hook is too
late.
5-C) The clearance between the
hook and inner hook presser is
too small.
5-D) Hook oil is insufficient.
5-E) The hook is defective. (Thread
catch)
6-A) The thread path is not smooth.
6-B) The thread path has a flaw.
6-C) The thread path has an obsta-
cle.
7-A) Inappropriate engagement
between the bobbin and bobbin
case causes the bobbin thread
to be caught.
7-B) Thread has not properly been
wound around the bobbin.
7-C) The tension adjusting spring of
the bobbin case is defective.
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Cause (2)
Move the arm thread guide rightward to reduce
the thread feeding with the thread take-up
lever.
Move the arm thread guide rightward to reduce
the thread feeding with the thread take-up
lever.
Set the timing of the hook to the standard or
slightly late level for cotton or spun thread.
Set the timing of the hook to the slightly early
level for filament thread.
Increase the clearance to smooth the thread
passing.
Adjust the oil volume to the appropriate level.
Replace the hook.
Finish the thread path appropriately.
Finish the thread path appropriately.
Finish the thread path appropriately to correct
threading.
Replace the bobbin or bobbin case.
The winding tension was too high or low.
Replace the bobbin case.
Check and corrective measures
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