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3-5) The matters related to the hook 5-A) The timing of the hook is too Set the timing of the hook to the standard or slightly late
are inappropriate. early. level for cotton or spun thread.
5-B) the timing of the hook is too late. Set the timing of the hook to the slightly early level for
filament thread.
5-C) The clearance between the hook Increase the clearance to smooth the thread passing.
and inner hook presser is too small.
5-D) Hook oil is insufficient. Adjust the oil volume to the appropriate level.
5-E)
The hook is defective. (thread catch)
Replace the hook.
3-6) The thread path is defective. 6-A) The thread path is not smooth. Finish the thread path appropriately.
6-B) The thread path has a flaw. Finish the thread path appropriately.
6-C) The thread path has an obstacle. Finish the thread path appropriately to correct threading.
3-7) The bobbin or bobbin case is 7-A) Inappropriate engagement Replace the bobbin or bobbin case.
defective. between the bobbin and bobbin
case causes the bobbin thread
to be caught
7-B) Defective thread winding around Adjust the tension and position of the bobbin thread.
the bobbin winder causes the Also be aware of uneven winding.
bobbin thread to be caught.
7-C) The tension adjusting spring of Replace the bobbin case.
the bobbin case is defective.
7-D) The bobbin thread idles in the Adjust the tension of the idling prevention spring with
bobbin case. reference to 3.-(5).
7-E) The bobbin has a flaw. Remove a burr at the flaw portion, or replace the bobbin.
3-8) Feeding is inappropriate. 8-A) The timing of feeding is Set the feed timing to a level slightly later than standard
inappropriate, or the height of (for cotton or spun thread). Set the feed timing to a level
the feed dog is too low. earlier than standard (for filament thread).
Lift the feed dog height.
Trouble Case (1) Case (2) Check and Corrective measures
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