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7-5-2. Adjustment of the holding pressure
Air pressure to the air cylinder, which drives respective mechanisms of work holding device, consists of
following 2 lines. Refer to the paragraph 3-2 and adjust.
Main circuit : 0.4 MPa ・・・ Work holder up/down, clamp frame up/down
Slider circuit : 0.2 ± 0.05 MPa ・・・ Slider
[Notice] Since the air pressure is directly related with the thread tension and the mechanical
operation, make sure to honor the above standard pressure.
7-5-3. Replacement of the presser parts
Presser plate is located with bolts on the work holder arm and the feed plate on the mounting block. To
assemble again after removal, align the needle down hole with both the presser plate and the feed plate
at respective home position at the center of needle hole of sewing machine bed.
7-5-4. Maintenance of the slider
Slider in made with oil less resin material to enable the sliding motion along the lower face of clamp plate.
Therefore, it wears with progress of time. Should it wear as much as the top of flat head screw, which is
locking the slider, is exposed, it could damage the opposite clamp plate resulting in the not-smooth
stitching feed. Worn slider should be replaced at an earlier opportunity.
7-6. Height Adjustment of the needle bar
(1) Remove the face plate from machine.
(2) Turn the manual pulley and stop the thread take up lever at the highest position.
(3) Slacken the set screw A connecting the needle bar.
(4) After having regulated a needle bar end face and the distance with the needle plate to 62mm, tighten
the set screw A connecting the needle bar.
(There are the thread release, presser foot and bobbin thread trimming in
addition to the above.)
Needle plate
- 17 -
Set screw A
62
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