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Adjustment Procedure
2) Feed trace and phase adjustment
By adjusting the phase of the vertical feed cam , it is possi-
ble to change the up/down timing for the feed locus and nee-
dle.
Adjustments can be carried out with two setscrews .
1. Timing standard (For DDL-8000A*-MS)
The vertical feed shaft engraved marker line coincides with
the vertical feed cam engraved marker line at 0°.
Refer to "3.-(3)-1) Standard adjustment".
2. Timing fast
If you adjust the vertical feed shaft engraved marker line to
the vertical feed cam engraved marker line and the minus
side, the vertical feed timing is hastened against horizontal
feed. (Also hastened against the needle)
(Cautions) Adjustments should be done within –20° (2 gradua-
tions).
3. Timing slow
If you adjust the vertical feed shaft engraved marker line
to the vertical feed cam engraved marker line and the plus
side, the vertical feed timing is delayed against horizontal
feed. (Also delayed against the needle)
(Cautions) Adjustments should be done within +20° (2 gradua-
tions).
(Cautions) 1. When timing of the vertical feed cam is
changed, the feed timing is also changed against
the needle.
2. The angle of the engraved marker line gradua-
tion 1 denotes 10°.
Results of Improper Adjustment
○ When tightening the two set-
screws of the vertical feed
cam , this work should be
done while a good centering is
secured.
Otherwise, there will be adverse
torque or unusual sound gener-
ation, or abnormal wear may be
caused.
○ Since the motion in horizontal
direction is reduced at the be-
ginning of feeding, the material
cloth is fed assuredly by the
effect of creep reduction.
○ Feeding force is reduced around
the end of feeding because the
feed dog lowers faster.
○ The motion becomes moderate
at the beginning of feeding, thus
making the material cloth biting
worse.
○ Light materials tend to be less
damaged.
○ The material cloth is fed as-
suredly at the end of feeding.
Thanks to the leading effect,
puckering tends to be improved.
– 12 –
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