– 23 –
Adjustment Procedure
Results of Improper Adjustment
1) Horizontal Feed Cam Timing
1. Loosen the set screws
of the bed top cover.
2. Remove the bed top cover
.
3. Loosen the horizontal feed cam setscrew
.
4. Observing the notch on the belt cover, turn the hand-wheel
until
the hand-wheel pointer is aligned with the graduation [B] on the hand-
wheel.
5. Turn the Horizontal Feed Cam
while moving the reverse feed
lever
up and down until the feed dog will not fluctuate. Now fix the
feed rock cam.
6. A clearance of 1 mm should be provided between the end face of the
feed rock rod
and the end face of the Horizontal Feed Cam
.
7. Fasten the Horizontal Feed Cam set screw
.
(Cautions) 1. Take care not to allow any such foreign matter as a
screw to enter the bed tank.
2. Adjust the timing within the range of
±
5
°
from the
standard timing.
3. After the feed rock timing has been adjusted, re-
adjust the feed driving timing.
2) Vertical Feed Timing
1. Perform the adjustment after adjusting the Horizontal Feed Timing.
2. Loosen the vertical feed cam set screw
.
3. Adjust so that the mark
(marker dot engraved on the end face of
the Horizontal Feed Cam
) on the Horizontal Feed Cam is in line
with the mark
(marker dot engraved on the Vertical Feed Cam
).
(Cautions) 1. Take care not to allow any such foreign matter as a
screw to enter the bed tank.
2. Adjust the timing within the range of
±
5
°
from the
standard timing.
o Improper stitch length may result
when the machine is operated at
high-low speed.
o Thread tension may change from
the correct one.
o Tightness of normal and reverse
stitches may be different from
each other.
4’ Refer to [3-(1) Types and Names
of Graduations on the Hand-
wheel].
5’ At that time, the first screw
in
revolving direction of the horizon-
tal feed cam
, is positioned al-
most upright.
o When the Horizontal Feed Cam
is fixed after turning it toward
the operator (in the direction of
arrow A) from the standard ad-
justment position, the Horizontal
Feed Timing will be advanced.
When the Horizontal Feed Cam
is fixed after turning it away from
the operator (in the direction of
arrow B) from the standard ad-
justment position, the Horizontal
Feed Timing is retarded.
o Improper stitch length may result
when the machine is operated at
high/low speed.
o When the Vertical Feed Cam
is fixed after turning it toward the
operator (in the direction of ar-
row A) from the standard adjust-
ment position, the feed driving
timing will be advanced. When
the Vertical Feed Cam is fixed af-
ter turning it away from the op-
erator (in the direction of arrow
B) from the standard adjustment
position, the Vertical Feed Tim-
ing is retarded.
