JUKI MB-1373, Инструкция по эксплуатации

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5. TROUBLES AND CORRECTIVE MEASURES
TROUBLES CAUSES CORRECTIVE MEASURES
1. Thread breakage
1
The yoke slide does not move in the correct
way.
™
Adjust the timing of forward, backward and
sideways of the yoke slide.
2
The tension lever has been improperly adjusted.
™
Properly adjust the tension lever.
3
The thread tension post No. 2 fails to release
the thread at correct timing.
™
Make the thread release timing slightly earlier.
4
Lifting amount of the button clamp jaw unit is
excessive.
™
Adjust the lifting amount of the button clamp jaw
lever to 8 mm.
5
The thread nipper catches the thread.
The nipper has been improperly adjusted.
(The clearance is too small.)
™
Adjust the position of the nipper bar block.
6
The needle does not enter the center of the
holes in the button.
™
Adjust the button clamp jaw lever holder.
7
The needle is too thick for the diameter of the
hole in the button.
™
Replace the needle by a thinner one.
2. The machine forms a
seam after it has run for a
while instead of forming it
from the start of sewing.
1
The thread pull-off lever has been improperly
adjusted.
™
Adjust the thread tension guide on the face plate
so that it provides a lower tension.
2
Tension of the thread tension guide on the
face plate is excessive.
™
Properly adjust the tension lever.
3. Buttons are not sewn
tightly
1
The yoke slide does not move in the correct
way.
™
Adjust the timing of the motion of the yoke slide at
each end.
2
The thread tension post No. 2 fails to release
the thread at correct timing.
™
Make the thread release timing slightly later.
3
The thread tension post No. 2 does not give
sufficient tension.
™
Tighten the tension nut of tension post No. 2.
4
The needle does not enter the center of the
holes in the button.
™
Adjust the button clamp jaw lever holder.
5
The work pressing force is too high or too low.
™
Adjust the work pressing force properly.
4. The last back-tack stitch
is poorly tensed.
1
The tension lever has been improperly adjusted.
™
Properly adjust the tension lever.
2
Timing of the knot-tying plate is incorrect.
™
Advance the timing of the knot-tying plate.
(Adjustment of the knot-tying notch)
3
The nipper has been improperly adjusted.
(The clearance is too large.)
™
Adjust the nipper with the nipper bar block.
5. The first stitch trails
relatively long thread from
the right side of the button.
The thread pull-off lever does not work properly.
™
Adjust the thread pull-off lever by the nipper bar
block (rear).
6. Thread trimming failure
in the state of stop-
motion
1
The thread tension post No. 2 fails to release
the thread at correct timing.
™
Make the thread release timing slightly later to
give more tension to the stitches.
2
The needle hits the edge of the holes in the
button.
™
Adjust the button clamp jaw lever holder.
3
The thread nipper fails to press the thread.
™
Adjust the nipper bar block.
4
The work pressing force is too high.
™
Adjust the work pressing force by the pressure
adjusting nut.
7. Thread trimming failure
1
The moving knife does not separate the
thread on the fabric with its separation nail.
™
Adjust the position of the moving knife.
2
The needle does not enter the center of the
holes in the button.
™
Adjust the button clamp jaw lever holders.
3
The last stitch skips.
™
Adjust the looper.
4
The moving knife thread separation nail is too
high or too low.
™
Adjust the height of the moving knife thread
separation nail.
8. The needle thread is cut
in two places on the
wrong side of the fabric.
1
The moving knife is set in wrong place.
™
Adjust the position of the moving knife when the
machine is in the stop-motion state.
2
The moving knife thread separation nail is too
high or too low.
™
Adjust the height of the thread separation nail.
9. Button trails too long
thread after thread
trimming.
1
Timing of the moving knife motion is wrong.
™
Adjust the position of the moving knife.
when the machine is in the stop-motion state.
2
Lifting amount of the button clamp jaw unit is
excessive.
™
Adjust the lifting amount of the button clamp jaw
lever to 8 mm.
10.Length of thread
remaining, after thread
trimming, on the wrong
side of the material
varies.
1
Position of the moving knife is not correct.
™
Adjust the position of the moving knife when the
machine completes stop-motion. (10 to 11 mm)
2
Lifting amount of the button clamp jaw unit is
excessive.
™
Adjust the lifting amount of the button clamp jaw
lever to 8 mm.