4.Trouble Shooting
Phenomena
Possible cause
Remedy
Chain pattern
skip
①Chain thread needle not
fixed in the right place
②Chain thread looper bar
not fixed in the right place
③Chain thread tension
disc too lax
Five threads lower looper should 3.5-4mm away from needle
the high to lower looper should 64.7-65.2mm
Adjust the looper bar, make the braid stitch seen when no
material fed
Tighten the nut by a litter
Thread of needle
cut
①Thread tension disc too
tight
②Needle too rough
③Lower looper rough
Loosen the nut
Change needle
Change or polish the needle
Upper looper
thread cut
①Chain thread pass
through in the wrong way
or thread tension disc too
tight
Thread of looper should pass through before needle thread or
loosen cut
②Hole of upper looper
rough
Polish the hole by the tension thread with the polish paste
Chain thread cut
①Thread through in wrong
way or the thread guide
rough
②Some sharp part of feed
dog
Looper thread should through before needle, or polish the
thread guide
Polish feed dog or change one
Chain thread
cut
①Chain thread looper not
fixed in the right place
②Chain thread looper
thread tension too tight
Five thread chain looper should 2.5-3mm away from needle,
height of chain thread should be R58-59mm
Loosen the nut
③The point of chain
thread looper is too far
away from needle
④Needle bended or
needle point rough
Adjust chain thread looper make the distance between them
0.05mm
Change the needle
Lower looper
make stitch
skipped
⑤The groove of needle is
not point to the right
orientation
⑥Chain thread looper
blunt
⑦Guide of chain thread
looper not fixed properly
①Lower looper not fixed in
the right place
Change the orientation point to the operator
Make looper sharp or change the looper
The thread should 0.01mm away from needle guide
Adjust the lower looper the angle should 3°-6°, lower looper
should 0.05 mm away from needle
Cross skip
①The distance of the
cross point between upper
looper and lower too far
Fixed the distance to 0.10mm
④Feed dog too sharp in
some part
⑤Small needle plate
sharp in some place
Polish the feed dog
Polish the needle plate
②Needle in not paralleled
to the needle bar
Parallel them by adjust or replaced
14
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