HIGHLEAD GC20618 Series, Instruction Manual Parts Catalog

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9
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
Positioning of hook point
(1) When the needle is at DOWN position, the smaller
Crossed helical gears on the right side and left side
should be engaged with the large wheel so that the
“S” screw of the former gear comes on the front side,
and that of the latter gear on the reverse side.
(2) Tighten each “S” screw, where is punched for
set screw, on the hook shaft.
(3) Approximate position of hook “C” screw of hook
should be found close to the needle when the needle
is at DOWN position.

To finely adjust timing between the needle motion and
hook motion, loosen the set screw of larger gear
wheel and move the gear wheel in its axial direction
within a range from 1mm to 2mm.
13
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Adjustment of feed dog height
Height of feed dog and pressure of presser foot should
be adjusted for individual fabric(s) with the following
cautions:
·
Fabric will be damaged if the feed dog extends too high,
or pressure of presser foot is too large.
·
Even stitch length cannot be assured if the feed dog is
too low or pressure of presser foot is too small.
·
Feed dog height should be measured at the point where
the needle is at the top position.
For light fabrics
……
Approx. 0.8mm from throat plate
For usual fabrics
……
Approx. 1.0mm from throat plate
For heavy fabrics
……
Approx. 1.2mm from throat plate
Adjustment procedure
a) Lean the machine head backward.
b) Turn the hand wheel by hand and stop when the feed
dog rises to the maximum height.
c) Loosen the feed bar set screw.
d) Vertically move the feed bar (in the direction indicated by arrow in the figure) to adjust it to
adequate height.