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Adjustment Procedures Results of Improper Adjustment
2) Position of the counter knife base
1. Loosen setscrews 1 in the counter knife base.
2. Use counter knife gauge 2 supplied as accessories and move
counter knife base 3 to the position as shown in the figure.
For the longitudinal position, make the edge of counter knife
base 3 come in contact with the step difference of the hook
shaft base.
For the lateral direction, insert counter knife gauge 2 between
the throat plate and the counter knife, and tighten two setscrews
1 in the counter knife base so that there is no clearance.
* For the right side, use plane R of counter knife gauge 2
and for the left side, use plane L of the gauge.
(Caution) When counter knife base 3 is moved, adjust again
the knife pressure.
When dimension C or D is larger
™ Knife pressure is increased and
motor stop will be caused.
™ Setting/taking out bobbin cannot
be performed.
™ Counter knife base interferes
with the rear end of moving
knife, and moving knife and
counter knife will be broken.
When dimension C or D is smaller
™ Knife pressure is decreased and
thread trimming failure occurs.
™ Moving knife interferes with the
hook stopping section, and
thread trimming failure occurs or
moving knife is broken.
When the clearance is larger
™ Clamp failure of needle thread
and bobbin thread occurs.
When the clearance is smaller
™ Moving knife interferes with the
inner hook.
™ There is no clearance where
thread enters between moving
knife and inner hook. As a result,
thread trimming failure will be
caused.
3) Vertical position of the moving knife
1. Loosen setscrew 1 in the rocking arm.
2. Loosen setscrews 2 in the moving knife shaft thrust collar.
3. Adjust so that the clearance between the center part of bottom
end of moving knife 3 and inner hook 4 is 0.3 to 0.4 mm, and
tighten setscrews 2 in the thrust collar.
4. Tighten setscrew 1 in the rocking arm so that there is no thrust
play at the moving knife shaft.
5. In case of 2-needle, both the left and right are the same
adjustment value.
(Caution) Adjust the height of moving knife 3 at the center
part of moving knife 3.
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