HIGHLEAD GC20618 Series, Instruction Manual Parts Catalog

Page: 18 / 54

—
15
—
b. Turn the vertical position adjusting screw B to adjust meshing pressure and then righter the hexagon
socket head cap screw A.
Note : Since excess pressure causes large
torque to the thread trimming mechanism
and trimming failure, adjust it so that
thread can be trimmed with minimum
pressure.
c
．
Move the movable knife and check that
the thread can be sharply trimmed.
25.
Sharpening of fixed knife
When the knives dull, the fixed should be sharpened as illustrated
in Fig. Since it is very difficult to sharpen the movable knife,
replace it with a new one when it dulls.
26.
Adjustment for change of needle-to-needle distance
(1) Replace the throat plate, feed dog and needle clamp.
(Since the throat plate and feed dog are special parts designed
for thread trimming machine, be sure to use those specified by us.)
(2) Lean the machine head backward.
(3) Loosen two connecting link
clamp bolts J.
(4) Remove the spring M.
(5) Loosen the hook bracket clamp
screws A and B and adjust gap
between each needle and hook.
(6) When the needles and hooks have
been adjusted, install the spring M.
(7) Contact the rocking cranks
C and D to the stopper pins E and F and tighten the connecting link clamp bolt J.
(8) Turn the balance wheel by band until the needles reach the lowest position.
(9) Loosen the nuts G and H.
(10) Depress the cam follower crank K and adjust the connecting rod L so that the cam roller can
smoothly enter the groove of thread trimmer cam.
(11) Adjustment of the cam groove and the cam roller