JUKI 35800 Series, Engineer'S Manual

Page: 59 / 61

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