−
80
−
Incorrect polishing
Stroke of spreader is too large.
Worn out looper’s pointed end and
incorrect polishing
Drawing-in amount of top covering
thread is too much.
Needle thread tension is too weak.
Incorrect threading
Thread tension is too weak.
Drawing-in amount of looper thread is
too much.
Incorrect polishing, Too long stitch
tongue
Worn out needle point, needle bend,
wrong needle
Worn out looper’s pointed end,
incorrect polishing
Needle bar position is too low.
Incorrect threading
Tension is too weak.
Thread guide position is too low.
Tension is too strong.
Drawing-in amount of looper thread is
too little.
Polish correctly.
Refer to standard adjustment.
Replace the looper when modified or its shape is
changed too much.
Refer to standard adjustment.
Increase tension.
Refer to threading diagram.
Increase tension.
Reduce drawing-in amount of thread.
Correct or replace part.
Replace needle with new one, Use UY121GJS
CS100, UY128GBS FS300.
Replace the looper when modified or its shape is
changed too much.
Refer to standard adjustment.
Refer to threading diagram.
Increase tension.
Lift the position
Reduce tension.
Increase drawing-in amount of thread.
Troubles(1)
Troubles(2)
Cause (1)
Cause (2)
Corrective measures
From the previous page
To the next page
Irregular stitches
(Left, Middle, Right)
Ill-tensed seam
Throat plate
Spreader adjustment
Looper
Top covering thread take-up
Needle thread tension
Threading
Top covering thread tension
Looper thread cam thread
guide position
Throat plate
Needle
Looper
Needle height
Threading
Needle thread tension
Intermediate thread guide
position
Looper thread tension
Looper thread cam thread
guide position
From
the
library
of:
Diamond
Needle
Corp
