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Trouble (1)
From the previous page
5-3) Poorly tense stitches
for needle thread
5-4)Sewing jam
5-5)Problems with cahin-
off thread
Trouble (2)
3-A) Needle
3-B) Lower looper
3-C) Needle height
3-D) Threading
3-E) Needle thread
tension
3-F) Lower looper thr
ead tension
3-G) Bobbin thread
guide path
3-H) Bobbin thread
cam
4-A) Regulating spring
of presser bar
pressure
4-B) Feeder height
4-C) Pressure regulating
spring of upper
feed roller
4-D) Upper feed roller
5-A)Throat plate
5-B) Lower looper
adjustment
5-C) Needle thread
tension
5-D) Threading
5-E) Drawing amount
of upper feed roller
5-F) Clearance toward
the upper feed
roller
5-G) Pressure regulating
spring of upper
feed roller
Cause (1)
Cause (2)
A-1)Needle top blunting,
needle bent, check
the needle in use.
B-1)Lower looper brade
point blunting or
insufficient polishing
C-1)Improper needle
bar height
D-1)Threading error
E-1)Insufficient thread
tension
F-1) Excessive thread
tension
G-1)Insufficient take-up
amount of the bobbin
thread
H-1)Delayed bobbin
hread cam position
A-1)Insufficient presser
bar pressure
B-1)Extremely low
feeder
C-1)Insufficient pressure
adjustment
D-1)Insufficient drawing
amount
A-1)Not smooth thread
running due to blunt
throat needle hole
B-1)Lower fancy stitch
skipping due to
insufficient lower
looper adjustment
C-1)Insufficient needle
thread tension
D-1)Threading error
E-1)The thread drawing
amount is insufficient.
F-1) Clearance is too
much between the
upper feed roller and
the upper face of
the throat plate.
G-1)Insufficient pressure
adjustment
– 56 –
Check and corrective measures
Replace the needle.
UY130GS
Replace any item if it has
been modified or its shape
has changed.
Refer to the adjustment values.
6. Refer to "How to conduct
threading".
Increase the thread tension.
Reduce the thread tension.
Increase the take-up amount
of the bobbin thread.
Advance the bobbin thread
cam position to the proper level.
Adjust the presser bar pres-
sure properly.
Make the feeder height proper.
Refer to the standard adjustment
values.
Adjust the presser bar pres-
sureproperly.
Adjust the drawing amount
properly.
Perform modification or replace
the deformed part.
Refer to the adjustment values.
Increase the thread tension.
6. Refer to "How to conduct
threading".
Increase the thread drawing
amount.
Refer to the adjustment values.
Adjust the clearance to a standard
level.
Refer to the adjustment values.
Adjust the presser bar pres-
sure properly.
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