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33
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Adjustment Procedures
Results of Improper Adjustment
1) When the knives have become dull, fully resharpen lower knife
1
until the contact mark of it disappears.
2) When the upper knife has become dull, replace it with a new
one. (This is because the upper knife is a serrated carbide
knife.)
1) Adjusting the thread cam
1
Adjust the position of the thread cam by its setscrew
1
with
the needles at their upper dead point so that the straight section
of the thread cam is leveled.
2
Laterally position the thread cam so that the looper thread cam
nail is located at the center of the thread cam groove.
[How to check for proper positioning]
Check that the thread cam releases the looper thread when the
needle tip begins to come out of the bottom surface of the throat
plate by 0 to 1 mm.
2) Adjusting the looper thread cam thread guides A and B
and the looper thread cam nail
1
Install looper thread cam thread guides A
2
and B
3
at the
center of the slots with setscrews A
4
and B
5
.
2
Install looper thread cam nail
6
with setscrew
7
so that the
straight section of the forked portion is leveled.
™
If the 10˚ angle of the lower knife
is exceeded, the durability of the
knife will be deteriorated, often
resulting in blade chipping.
™
If the angle is smaller than 10˚,
the knife will be dull.
™
If the 55˚ angle is not observed,
the knife may catch materials.
™
If the timing of the thread cam
is too early, the needle point will
fail to enter a thread triangle,
resulting in looper thread stitch
skipping.
™
If the timing of the thread cam
is too late, puckering and loose
looper thread stitches will
results.
™
If the chain looper thread guide
is moved away from you, the
take-up amount of the lower
looper thread will decrease. In
this case, puckering may result
there by impairing the feeling of
the finished product.
0 to 1 mm
Thread
Throat plate
Summary of Contents for MO-6000S series
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