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10. Flaw on the bobbin 10-1) The bent needle scratches the Use a hook with needle holder that is compatible with #11
bobbin. or equivalent needles. 11141355 for SS, 22890404 for DS
11. Irregular stitch 11-1) The matters related to the hook 1-A) Hook oil is too large or too Adjust the oil volume to the appropriate level.
are inappropriate. small in amount.
1-B) The hook is defective. (thread Replace the hook or modify the thread path.
catch, defective thread path, etc.)
11-2) The bobbin or bobbin case is 2-A) Inappropriate engagement Replace the bobbin or bobbin case.
defective. between the bobbin and bobbin
case causes the bobbin thread
to be caught.
2-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.
2-C) The tension adjusting spring of Replace the bobbin case.
the bobbin case is defective.
2-D) The bobbin thread idles in the Adjust the tension of the idling prevention spring with
bobbin case. reference to 3.-(5).
2-E) The bobbin is inserted into the Refer to 3.-(5). Irregular stitches are corrected by rotating
bobbin case in the wrong direction. the bobbin in the reverse direction.
11-3) The needle or bobbin thread Increase the tension of the needle or bobbin thread.
tension is too low.
11-4) The thread take-up spring is 4-A) The stroke of the thread take-up Adjust the stroke of the thread take-up spring.
inappropriately adjusted. spring is too long or too short.
4-B) The tension of the thread take- Adjust the tension of the thread take-up spring.
up spring is too high or too low.
11-5) The thread path is defective. 5-A) The thread path is not smooth. Finish the thread path appropriately.
5-B) The thread path has a flaw. Finish the thread path appropriately.
5-C) The thread path has an obstacle. Finish the thread path appropriately to correct threading.
Trouble Case (1) Case (2) Check and Corrective measures
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