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Adjustment Procedure
1. Set the amount of feeding (feed dial graduation) at 0.
2. Loosen the setscrew of the vertical feed bracket shaft and
the setscrew of the horizontal feed bracket shaft .
3. The feed dog height and gradient are changed when both
shafts of the vertical feed bracket shaft and the horizontal
feed bracket shaft are turned by means of a flatblade screw-
driver.
4. After adjustments, firmly tighten the screws that have been
loosened.
(Screw tightening should be done under the condition that the
setscrews and are pushed against the vertical feed brack-
et shaft and the horizontal feed bracket shaft .)
(Caution) 1. In regard to the locus of standard feeding, the
throat plate and the feed dog rise almost horizon-
tally when the throat plate rises.
2. The position of the engraved marker dots for the
vertical feed bracket shaft ❶ and the horizontal
feed bracket shaft ❸ should be adjusted on the
near side (operator side). (Refer to Fig. D.)
３. Assemble the feeder bar ❼ perpendicular to the
vertical feed bracket shaft ❶ and horizontal feed
bracket shaft ❸ without load.
Right
Marking point
❶
Near side
Wrong
❷
Rear side
Fig. D
– 6 –
Results of Improper Adjustment
○ If the gradient of the feed dog
is adjusted for either shaft only,
the feed dog height may be
changed. Adjustments are need-
ed for both shafts in all cases.
○ According to the shaft adjusting
position, the position of feed dog
motion may be shifted.
In such a case, loosen the tighten-
ing screw of the horizontal feed
arm to adjust the position of
motion.
○ According to the result of feed
dog height or gradient adjust-
ments, there is possibility of
interference with the thread
trimmer unit.
○ When the feed dog height is
set above the standard level,
the feeding power is improved.
Instead, there can be problems
of presser jumping at high speed
and flaws in light materials.
○ If the feed dog height is too
much, a return will be given to
the front side (Section C) of the
❶
feed dog. As a result, the behav-
ior of material feeding may be
affected.
If the height has to be increased
❷
for an unavoidable reason, the
amount of return can be reduced
by adjusting the gradient of the
feed dog to raise its tip.
0.8mm DDL-8000A*-MS
1.2mm DDL-8000A*-SH
C
(DDL-8000A*-SJ)
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