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Adjustment Procedures
1. How to join the throat plate and the bobbin thread trimming
knife
(1) Hold the bobbin thread trimming knife perpendicular to the throat
plate. Install it to avoid any twisting motion during operation.
(2) Loosen the setscrew
the bobbin thread trimmer knife cylinder
(3) Loosen the setscrew
the bobbin thread trimmer knife cylinder
(4) Set the left bobbin thread trimmer base
trimming knife does not cause twisting motion, and fix the setscrew
.
(5) Set the right bobbin thread trimmer base
trimming knife does not cause twisting motion, and fix the setscrew
.
2. Adjustment of bobbin thread trimming knife position and height
(1) Join the upper surfaces of both right and left bobbin thread trimming
knives with the upper surface of the throat plate in the same plane.
Make adjustments so that the groove of throat plate meets in parallel
to that of the bobbin thread trimming knife when the bobbin thread
trimmer is actuated.
(2) Loosen the setscrew
adjustments so that the upper surfaces of the throat plate and the
bobbin thread trimming knife are joined in the same plane.
(3) Loosen the setscrew
adjustments so that the upper surfaces of the throat plate and the
bobbin thread trimming knife are joined in the same plane.
(Caution) Be aware that the bobbin thread trimming knife should
be below the top surface of the throat plate.
(4) Push the bobbin thread trimming knife cylinder
thread trimmer in Direction A and adjust its position so that the groove
of the bobbin thread trimming knife meets in parallel to that of the
throat plate.
(5) Push the bobbin thread trimming knife cylinder
thread trimmer in Direction B and adjust its position so that the groove
of the bobbin thread trimming knife meets in parallel to that of the
throat plate.
(6) Tighten the right and left setscrews
3. Replacement of the bobbin thread trimming knife
(1) When the setscrews
thread trimming knives can be pulled off downwards.
4. Adjustment of bobbin thread trimming knife sharpness
(1) Adequately push the thread clamp pushing spring
bobbin thread trimming knife to adjust its sharpness.
(2) The pushing force should be kept as light as possible, to a degree
the thread can be cut assuredly. Then, the
of the left bobbin thread trimmer and actuate
.
of the right bobbin thread trimmer and actuate
.
where the bobbin thread
where the bobbin thread
of the left bobbin thread trimmer and make
of the right bobbin thread trimmer and make
and
.
and
are loosened, the right and left bobbin
of the left bobbin
of the right bobbin
against the
– 10 –
Results of Improper Adjustment
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