– 25 –
Adjustment Procedure
Results of Improper Adjustment
1. Loosen the top cover setscrew.
2. Remove the top cover.
3. Turn the hand-wheel to bring the marker dot
engraved on the
periphery of the main shaft to the top.
4. Loosen the No.1 set screw
and No. 2 screw of the upper feed cam
.
5. Align the marker dot
engraved on the periphery of the main shaft
with the set screw No. 1
of the upper feed cam
.
6. Fasten the set screws No.1
and No. 2 of the upper feed cam
.
(Cautions) 1. Take care not to allow any foreign matter such as a
screw to enter the arm.
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 When the upper feed cam
is
turned toward the operator (in the
direction of arrow A), the upper
feed timing will be earlier than the
standard timing. When the upper
feed cam is turned away from the
operator (in the direction of ar-
row B), the upper feed timing will
be retarded more than the stan-
dard timing.
5’ At that time, make sure that the
clearance of 0.5 mm is provided
between the end face of the up-
per eccentric rod
and the end
face of the periphery of the up-
per feed cam
.
