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65
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A-1) Needle bend, improper needle
attaching and wrong needle
B-1) Needle bar position is too high.
C-1) Incorrect threading
D-1) R of stitch tongue in throat plate is
too small.
Incorrect polishing
E-1)
R of looper’s ventral section is too
large and ridgeline is not tense, for
which needle thread is likely to slip
from looper.
F-1)
Too little contact amount between
looper’s back and needle
G-1) Thread tension is too weak.
H-1) Low position of thread guard
results in too large needle thread loop.
I-1)
Thread guard position is too high.
J-1)
Use of nipper could easily
generate this trouble.
K-1) Drawing-in amount of looper
thread is too much.
Replace the needle with the new one, Use UY128GAS.
Refer to the standard adjustment figures.
Refer to threading diagram.
Increase R. Polish correctly.
Replace it with the genuine part.
Refer to the standard adjustment figures.
Increase tension.
Lift thread guide position.
Refer to the standard adjustment figures.
Do not use nipper.
Reduce drawing-in amount of thread.
8-A)
Needle
8-B)
Needle height
8-C) Threading
8-D) Throat plate
8-E)
Looper
8-F)
Looper adjustment
8-G) Thread tension
8-H) Needle thread guide rod
8-I)
Thread guard position
8-J)
Auxiliary thread tention adjustment
8-K)
Looper thread cam
thread guide position
Troubles (1)
Troubles (2)
Cause (1)
Cause (2)
Corrective measures
From the previous page
To the next page
5-8)
Single chain thread cast-
off (Right, Middle, Left)
R
