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WARNING :
Turn OFF the power before starting the work so as to prevent accidents caused by abrupt start of the sewing machine.
Trouble Cause Checking Corrective measures
7. Irregular stitches 7-1) Stroke of the thread take-up
spring is improper.
1-A) Check the stroke of the
thread take-up spring.
Adjust the thread take-up spring to move to ap-
proximately 1 mm from the initial position when
hook draws thread maximumly.
7-2) Thread paths have been
poorly nished.
2-A) Check the nish of the re-
spective thread paths.
Finish with a ne emery paper or buff.
7-3) Bobbin fails to move
smoothly.
3-A) Check the change of bobbin
thread tension.
Replace the bobbin or the hook with new ones.
7-4) Bobbin thread tension is too
low.
Increase the tension of the bobbin thread.
7-5) Bobbin has been wound too
tight or too weak.
5-A) Check the state of bobbin
winding.
Decrease or increase the tension applied to the
bobbin winder.
7-6) Direction of setting bobbin is
reverse.
6-A) Check the setting. Properly set the bobbin.
8. Loose stitches at the time of corner
stitching
8-1) Needle thread on the stop-
ping side is drawn out more
than is necessary.
1-A) Check the stroke of the
thread take-up spring.
In crease the stroke of the thread take-up
spring.
1-B) Check the hook timing. Retard the hook timing.
Use the optional walking foot. (Top divided type)
Adjustment of the thread take-up spring
o
Decrease the tension of the thread take-up spring and decrease the stroke of the spring to improve irregular stitches.
海外講習会用121122LU-2810(-7)EM
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