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68
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A-1) Incorrect polishing
B-1)
Stroke of spreader is too large.
C-1) Worn out looper’s pointed end
and incorrect polishing
D-1) Drawing-in amount of top
covering thread is too much.
E-1)
Needle thread tension is too weak.
F-1)
Incorrect threading
G-1) Thread tension is too weak.
H-1) Drawing-in amount of looper
thread is too much.
A-1) Incorrect polishing, Too long
stitch tongue
B-1) Worn out needle point, needle
bend, wrong needle
C-1) Worn out looper’s pointed end,
incorrect polishing
D-1) Needle bar position is too low.
E-1) Incorrect threading
F-1)
Tension is too weak.
G-1) Either the position of thread
guide is too low or too high.
H-1) Tension is too strong.
I-1)
Drawing-in amount of looper
thread is too little.
Polish correctly.
Refer to the standard adjustment figures.
Replace the looper when modified or its shape is
changed too much.
Refer to the standard adjustment figures.
Increase tension.
Refer to threading diagram.
Increase tension.
Reduce drawing-in amount of thread.
Correct or replace part.
Replace needle with new one, Use UY128GAS.
Replace the looper when modified or its shape is
changed too much.
Refer to the standard adjustment figures.
Refer to threading diagram.
Increase tension.
Refer to the standard adjustment figures.
Reduce tension.
Increase drawing-in amount of thread.
Troubles (1)
Troubles (2)
Cause (1)
Cause (2)
Corrective measures
From the previous page
To the next page
5-10) Irregular stitches
(Left, Middle, Right)
5-11) Ill-tensed seam
10-A) Throat plate
10-B) Spreader adjustment
10-C) Looper
10-D) Top covering thread take-up
10-E) Needle thread tension
10-F) Threading
10-G) Top covering thread tension
10-H) Looper thread cam
thread guide position
11-A) Throat plate
11-B) Needle
11-C) Looper
11-D) Needle height
11-E) Threading
11-F) Needle thread tension
11-G) Needle thread guide rod
11-H) Looper thread tension
11-I) Looper thread cam
thread guide position