Table of Contents
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Trouble
① The needle thread is not clamped
14. Two thread twine
with each other.
② The needle thread is not trimmed
① The sensitivity of the thread
15. Thread breakage
detection error
occurs and the
sewing machine
stops though the
sewing machine
normally carries
out sewing.
① The sensitivity of the thread
16. The thread
breakage detection
error does not occur
and the sewing
machine does not
stop though the
thread breaks.
① The needle thread tension is too
17. The needle
thread appears
② The needle thread tension
on the wrong
side of the
material.
Cause
at the end of previous sewing.
at the end of previous sewing.
breakage detection sensor is too
low. This problem is likely to occur
when using thin thread, the thread
tension is too high or the sewing
machine runs at a low speed.)
breakage detection sensor is too
high. This problem is likely to
occur when the sewing machine
runs at a high speed.
low.
cannot be increased since the
bobbin thread is too thin.
Corrective measures
◦ Adjust the remaining length of the
needle thread after thread trimming to
45 mm or longer.
◦ Adjust the position of the wiper with
respect to the needle thread suction
device.
◦ Take a corrective measure referring to
the cause of phenomenon 4.
◦ Turn the sensitivity adjusting knob of
the thread breakage detection sensor
clockwise to increase the sensitivity.
◦ Turn the sensitivity adjusting knob of
the thread breakage detection sensor
counterclockwise to decrease the
sensitivity.
◦ Increase the needle thread tension.
◦ Decrease the height of the
intermediate presser.
◦ Retard the feed timing.
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