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71 −
Incorrect shape of pointed end of
looper disables scooping a loop.
Needle bend, incorrect needle
mounting direction, wrong needle
Not used.
Too high
Needle bar position is too high.
Incorrect threading
Not used.
Spreader thread tension is too strong.
Stitch skip occurs before thread
breakage produced by needle heat.
Incorrect clearance adjustment,
incorrect returning amount adjustment
Incorrect contact amount, incorrect
height
Incorrect shape of pointed end of
looper disables scooping a loop.
Needle bend, incorrect needle
mounting direction, wrong needle
Being used.
Height is too low.
Needle bar height is too low.
Incorrect threading
Replace it with the genuine part.
Replace the needle with new one, Correct the
mounting direction, Use UY121GJS CS100, UY128
GBS FS300.
Use nipper.
Correct the height to appropriate height.
Refer to standard adjustment.
Refer to threading diagram.
Use needle guard.
Reduce the tension.
Same described in page “ Thread breakage by
needle heat”
Refer to standard adjustment.
Refer to standard adjustment.
Replace it with the genuine part.
Replace the needle with new one, Correct the
mounting direction, Use UY121GJS CS100, UY128
GBS FS300
Do not use nipper.
Correct height position to appropriate height.
Refer to standard adjustment.
Refer to threading diagram.
Looper
Needle
Nipper
Intermediate thread guide
Needle height
Threading
Needle guard
Spreader
Needle heat
Looper adjustment
Needle guard, front and rear
Looper
Needle
Nipper
Intermediate thread guide
Needle height
Threading
Troubles(1) Troubles(2) Cause (1) Cause (2) Corrective measures
Stitch skipping Looper does not scoop the
right needle thread.
Looper does not scoop the
middle needle thread.
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From the library of: Diamond Needle Corp
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