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Thread tension
defect
Fabric yarn
breakage (run)
Chain-off thread
does not come out.
General sewing
defect (In case of
spun thread or the
like)
Fabric yarn
breakage occurs
with synthetic knit
goods.
Thread pulling
occurs with light-
weight materials.
Breakage or wear
of spreader
Loop on the right side of cloth is
too large.
Loop is excessively tightened.
Stitches on the right side of
sewing product (wrong side when
sewing) are strongly tightened.
When the presser is raised in the
corner stitching, thread is
loosened.
Thread tension is too high.
Hook needle has burrs.
Loop guide fails to work.
Needle does not enter until it goes
to the end.
Timing between spreader and
looper is not proper.
Thread fails to enter loop due to
rough motion of thread at the time
of chain-off thread.
Chain-off thread is difficult to
come out due to cloth pulling
condition.
Thread is thick and chain-off
thread is caught on feed dog.
When using the thread of large
resistance such as spun thread or
the like, if there are many
threading sections such as thread
guide and the like, change of
thread tension increases.
Needle is too thick.
Needle is too thick.
Machine turns a sharp curve by
force.
Machine is sewing an extra
heavy-weight material.
Contact of parts
Increase the thread tension.
Move to upside the thread take-up thread
guide, right.
Reduce the thread tension.
Move to downside the thread take-up
thread guide, right.
Move to downside the thread take-up
thread guide, left.
Increase the rising timing of thread
tension disk.
Adjust the thread tension.
Replace the needle with a new one.
Bring up the loop guide near the needle.
Enter the needle until it goes to the end.
Readjust the timing.
Reduce the stroke of the thread take-up
spring.
Decrease the height of the feed dog.
Reduce the vertical movement of the feed
dog.
Lightly pull the cloth backward in the left
direction.
Increase the vertical movement of the
feed dog.
Reduce to the utmost the threading
sections between thread stand,
intermedite thread guide and arm thread
guide, and reduce the change of thread
tension.
Use a thin needle within the sewing
possible range.
Use a thin needle within the sewing
possible range.
Turn the curve slowly.
Do not change the direction when needle
is pierced.
Advance the feed timing and make the
needle pierce the sewing product after
the sewing product has been completely
fed.
Check whether the parts come in contact
with each other.
Corrective measuresCausesTroublesNo.
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