JUKI LK-1900AN, Руководство инженера

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Trouble Cause (1) Cause (2) Check and corrective measures
4. Thread breakage 4-1) Scratches on the inner
hook
1-A) Scratches on section
A
(Con-
tact of the inner hook with the
needle)
After polishing the blade point of the inner
hook with oilstone, polish it with polish-
ing powder. Properly adjust the clearance
between the needle and the inner hook.
1-B) Scratches on section
B
((Scratches occur when the
needle is bent or broken.)
After polishing the blade point of the inner
hook, polish it with polishing powder.
1-C) Scratches on section
C
(Needle
scratches the inner hook when
removing the inner hook.)
After polishing the blade point of the inner
hook, polish it with polishing powder.
1-D) Scratches on section
D
After polishing the blade point of the inner
hook, polish it with polishing powder.
4-2) Thread enters into the
shuttle.
2-A) Position of the shuttle upper
spring is wrong.
Properly adjust the position of the shuttle
upper spring.
2-B) Blade point section
A
of the
shuttle is round.
Replace the inner hook.
2-C) Position of the shuttle is wrong. Properly adjust the position of the shuttle.
2-D) Needle thread tension is too low. Properly adjust the needle thread tension.
2-E) Thread take-up spring tension is
too low.
Adjust the thread take-up spring.
2-F) Length of the remaining needle
thread is too long.
Properly adjust the thread tension No. 1
asm.
2-G) The specified inner hook and
shuttle driver are not used.
Use the specified parts.
4-3) Scratches on the shuttle
driver.
Remove the scratches and polish with buff,
or replace the shuttle driver.
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