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77
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Needle bend, wrong needle
Needle bar position is too high.
Incorrect threading
R of stitch tongue in throat plate is too
small.
Incorrect polishing
R of looper’s ventral section is too
large and ridgeline is not tense, for
which needle thread is likely to slip
from looper.
Too little contact amount between
looper’s back and needle
Thread tension is too weak.
Low position of thread guard results
in too large needle thread loop.
Thread guard position is too high.
Use of nipper could easily generate
this trouble.
Drawing-in amount of looper thread is
too much.
Replace the needle with the new one, Use
UY121GJS CS100, UY128GBS FS300.
Refer to standard adjustment.
Refer to threading diagram.
Increase R. Polish correctly.
Replace it with the genuine part.
Refer to standard adjustment.
Increase tension.
Lift thread guide position.
Refer to standard adjustment.
Do not use nipper.
Reduce drawing-in amount of thread.
Needle
Needle height
Threading
Throat plate
Looper
Looper adjustment
Thread tension
Intermediate thread guide
position
Thread guard position
Nipper
Looper thread cam thread
guide position
Troubles(1)
Troubles(2)
Cause (1)
Cause (2)
Corrective measures
From the previous page
To the next page
Single chain thread cast-off
(Right, Middle, Left)
R
From
the
library
of:
Diamond
Needle
Corp
