HIGHLEAD GC20618 Series, Instruction Manual Parts Catalog

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(3) Force applied to the safety clutch.
a) The force applied to the safety clutch is the
smallest when the white mark of the eccentric
pin faces the center of the lower shaft. The
force proportionally increases as the white mark
faces the outside.
b) To adjust the force slide the timing belt, loosen
the set screw, and turn the eccentric pin.
c)
After the adjustment, make sure to fasten the set screw.
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Upper feed adjustment
(Needle side)
If the uneven feeding occurs according to the fabric,
Adjust the long hole of the horizontal feed shaft crank
(right) to adjust the upper feed length. (How to adjust)
a) Loosen the special bolt.
b) Move the special bolt upward to decrease upper feed.
c) Move the special bolt downward to increase the upper feed. The upper feed and the lower feed
theoretically becomes equal at the reference line on the horizontal feed shaft crank.
d)
Securely tighten the special bolt after adjustment.
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Outside presser foot and inside presser vertical stroke adjustment
When fabric with large elasticity is sewn, or when thickness of fabric changes, the vertical stroke
(movable range) of the presser feet should be adjusted as follows:
Adjustment
a) Loosen the special bolt.
b) The vertical strokes of the presser feet become
c) maximum when the crank rod is moved upward and set.
d) The vertical strokes becomes minimum when the nut
is moved downward and set.
e) After the adjustment, fully tighten the special bolt.
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The vertical strokes of the presser feet can be adjusted within a range from 6mm to 2mm.
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Adjustment
Screwing the pin that connects the link of back-sewing with the crank of back-sewing (down) can
adjust the tolerance of between the stitches. Screwing the pin in clockwise can increase the stitch
of forward sewing; otherwise, the stitch of back-sewing will be increased.