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Trouble (1)
5. Stitch skipping
5-1) The looper does not
5-2) Chain stitch unthr
(Chain stitch)
The needle thread caught
on the looper is unthreaded
before the needle lowers
and enters the needle
thread loop.
（(unthreading)
The needle thread loop
caught on the looper is
fully unthreaded before
the needle lowers.
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Trouble (2)
1-A) Looper
scoop the needle
thread.
1-B) Needle
1-C) Needle thread
1-D) Needle thread
1-E) Needle height
1-F) Threading
1-G) Needle heat
1-H) Lower looper
1-I) Rear needle guide
2-A) Needle
eading
2-B) Needle height
2-C) Threading
2-D) Lower looper
2-E) Lower looper
2-F) Thread tension
2-G) Needle thread
Cause (1)
Cause (2)
A-1)The blade shape
is not proper.
B-1)Needle bent or
wrong mounting
direction
C-1)Improper loop timing
holder
due to no use of the
needle thread holder
D-1)Height of the thread
adjusting path
path is insufficient.
E-1)Improper needle
bar height
F-1) Threading error
G-1)This problem occurs
in a thick area of the
denim material cloth.
H-1)Improper clearance
adjustment
or excessive looper
return
I-1) Improper height or
contact level
A-1)Needle bent or
mounting error
B-1)Improper needle
bar height
C-1)Threading error
D-1)Improper lower
looper mounting
angle Insufficient
lower looper
drawing amount
E-1)Insufficient contact
adjustment
level between the
needle and the rear
of the lower looper
F-1) Insufficient thread
tension
G-1)Excessive height
holder
of thread holder
position
– 55 –
Check and corrective measures
Regular parts are used
Replacement of needles and
installation of the needle hole
section in the front shall be
carried out correctly.
UY130GS
Use the needle thread support
plate to adjut the height properly.
Refer to the adjustment values.
Adjust the height properly.
Refer to the adjustment values.
Needle bar height and looper
drawing amount Confirmation
Refer to the adjustment values.
6. Refer to "How to conduct
threading".
Use needle cooling air.
Refer to the adjustment values.
Reduce the looper return.
Refer to the adjustment values.
Height of main feed dog and
longitudinal position check
Refer to the adjustment values.
Replace the needle, or mount
the needle hole in the front
correctly. Then, insert the
needle to the up end of the
needle mounting hole of the
needle stopper.
UY130GS
Needle bar height and looper
drawing amount check
Refer to the adjustment values.
6. Refer to "How to conduct
threading".
Make the lower looper mounting
angle proper or increase the
drawing amount (in the flat
mounting range).
Adjustment of looper movement
locus
Refer to the adjustment values.
Increase the tension.
Refer to the adjustment values.
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