JUKI MS-3580 Serie Manual De Instrucciones página 123

Trouble (1) Trouble (2)
From the previous page
5-2) Chain stitch unthr
eading
(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.
5-3) Poorly tense
stitches for needle
thread
To the next page
Cause (1)
2-A) Needle A-1) Needle bent or
mounting error
2-B) Needle height B-1) Improper needle
bar height
2-C) Threading
C-1) Threading error
2-D) Lower looper D-1) Improper
lower looper
mounting angle
Insuffi cient
lower looper
drawing amount
E-1) Insuffi cient
2-E) Lower looper
contact level
adjustment
between the
needle and
the rear of the
lower looper
2-F) Thread tension F-1) Insuffi cient
thread tension
2-G) Needle thread G-1) Excessive
height of thread
holder
holder position
3-A) Needle A-1) Needle top
blunting, needle
bent, check the
needle in use.
B-1) Lower looper brade
3-B) Lower looper
point blunting
or insuffi cient
polishing
3-C) Needle height C-1) Improper
needle bar
height
3-D) Threading D-1) Threading error
3-E) Needle thread E-1) Insuffi cient
tension thread tension
F-1) Excessive
3-F) Lower looper
thread tension
thread tension
3-G) Bobbin thread G-1) Insuffi cient take-
guide path up amount of the
bobbin thread
3-H) Looper thread H-1) Delayed looper
cam thread cam position
− 51 −
Cause (2) Check and corrective measures
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.
Refer to "#- 5. How to
conduct threading".
Make the lower looper
mounting angle proper
or increase the drawing
amount (in the fl at mounting
range).
Adjustment of looper
movement locus Refer to
the adjustment values.
Increase the tension.
Refer to the adjustment
values
Replace the needle.
UY130GS
Replace any item if it has
been modifi ed or its shape
has changed.
Refer to the adjustment
values.
Refer to "#- 5. How to
conduct threading".
Increase the thread
tension.
Reduce the thread tension.
Increase the take-up
amount of the bobbin
thread.
Advance the looper thread
cam position to the proper
level.