JUKI LK1903B-311, Инструкция по эксплуатации

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VII. TROUBLES AND CORRECTIVE MEASURES IN BR
Corrective measures
• Decrease the tension of the tension controller No. 1.
• Adjust the disk floating amount of the tension controller
No. 2.
• Use a needle hole guide with a higher boss.
• Use a button clamp of which lever plate is thinner than
the current one.
• Correct the wiper spring.
• Increase the number of stitches of the soft-start (memory
switch).
(Example : 400 → 400 → 400 → 900 → )
• Adjust the position of the button clamp jaw lever so that
the needle enters the exact center of the holes in the
button.
• Adjust the position of the feed plate so that it does
not come in contact with the boss of the needle hole
guide. If the sewing size is large for the feed plate used,
replace it with the feed plate for medium-size buttons or
for large buttons.
• Change the needle count in accordance with the sewing
product or the holes in the button.
• Increase the tension of the tension controller No. 1.
• Adjust the disk floating timing of the tension controller
No. 2.
• Decrease the pressure of the wiper spring.
• Replace the current button clamp with another one of
which lever plate is thicker than the current one.
• Improve the actuation of the button clamp.
• Correct the button clamp jaw lever spring so that it
increases the retaining force for the button.
• Correct the leaf spring so that it does not excessively
work.
• Replace the current button clamp with another one of
which lever plate is thicker than the current one.
Trouble
(Phenomenon)
1. Thread slips off
the needle at
the sewing start.
Or, the machine
starts sewing a
button from an
intermediate step
of button sewing
procedure.
2. Needle breakage
frequently occurs.
3. The finished state
of the wrong side
of the material is
extremely poor.
4. The button is not
sewn at the correct
position.
Cause
① Lenght of needle thread remaining
in the needle is too short.
② The material flops.
③ The wiper does not press the thread.
④ Sewing machine speed is too fast at
the start of sewing.
① The needle hits the edge of holes in
the button.
② The boss of the needle hole guide
comes in contact with the recessed
part of the feed plate.
③ The needle used is too thin.
① Length of needle thread remaining
in the needle is too long.
② The thread catching force of the
wiper is excessive.
③ If sewing a button of which wrong
side is round-shaped, the stitches
on the wrong side of the material are
entangled to make a lump of thread.
①
The button is not secured in the
correct sewing position.
② The leaf spring of the button clamp
excessively works.
③ When using a button of which wrong
side is round-shaped, the thread
enters the space between the
bottom face of the button and the
top face of the boss of the needle
hole guide. As a result, the button is
not fed smoothly.