JUKI MB-1800 series, Руководство инженера

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14. CAUSE OF TROUBLES AND THE CORRECTIVE MEASURES
(1) Thread trimming troubles and the corrective measures
Troubles Causes Corrective measures
Correct the position of the moving knife
at the time of completion of the stop
motion.
Refer to the item “5. (2) Adjusting the
position of the moving knife”.
2. Both the thread on the
needle and that on the
wrong side of a fabric are
trimmed.
The trimming timing of the moving
knife is bad.
1. Thread is not trimmed. The thread separating claw of the
moving knife fails to separate the
thread on a fabric from that on the
needle.
Adjust the position of the moving knife.
Refer to the item “5. (2) Adjusting the
position of the moving knife”.
The needle does not come down
into the correct point of a button
hole.
Make readjustment by the button
clamp holder.
The final stitch is skipped. Correct the position on the looper.
Refer to the item “4. (2) Positioning the
needle and the looper”.
The height of the thread separating
claw of the moving knife is not
correct.
Correct the height of the thread
separating claw of the moving knife.
Refer to the item “5. (3) Adjusting the
height of the thread separating claw
of the moving knife”.
Improper position of the moving
knife
3. The trimmed thread on the
wrong side of a fabric is too
long.
Improper height of the thread
separating claw of the moving
knife.
Correct the height of the thread
separating claw of the moving knife.
Refer to the item “5. (3) Adjusting the
height of the thread separating claw
of the moving knife”.
The lift of the button clamp is too
large.
Correct the position of the moving
knife.
Refer to the item “5. (2) Adjusting the
position of the moving knife”.
Readjust the lift to 10 mm.
Refer to the item “4. (5) Lift and
pressure of the button clamp”.
(Caution) Adjust the position of the moving knife within a range of 10 to 15 mm.
If the position of the moving knife is readjusted to less than 10 mm, the thread separating claw comes in
contact with the counter knife or the yoke slide insert, resulting in damaged thread separating claw of
the moving knife.
On the other hand, if it is readjusted to more than 15 mm, the thread separating claw may come in
contact with the positioning finger yoke slide while the machine is running, also causing breakage of
the thread separating claw.