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Adjustment Procedures
1) Set the feed amount to 0 mm. (Feed amount of the machines other
than A-SR type is regulated to max. 2 mm at the time of delivery.)
2) Adjusting the height of the feed dog
Loosen screw 1 and adjust the height of the feed dog by turning feed
driving link shaft 2.
3) Adjusting the inclination of the feed dog
Loosen screw 3. Put a screwdriver through the hole for the screwdriver
and adjust the inclination of the feed dog by turning the feed rocker
shaft with the screwdriver.
(Caution)
1. If the feed rocker shaft is not pressed in the direction A
(a) during the adjustment procedure, there will be a
play at the feed bar or washer will come off. So, be sure
to adjust the feed dog with the feed rocker shaft pressed
in the direction A (a).
2. Check to be sure that the feed dog is leveled with the
feed amount currently used when the top surface of
the ascending feed dog is flush with the top surface of
the throat plate.
3. For the adjustment of slippage of materials for A-SU
and A-DU, refer to (5) Adjusting the slippage of materials
and adjusting the feed timing.
Adjustment Procedures
A. Adjusting procedure by removing the gear box cover (A-SS,A-DS)
1) Remove the gear box cover. (Refer to the item 4-(1).)
2) Adjust the marker line engraved on the thread take-up to the timing
mark I engraved on the face plate.
3) Set the feed amount to 0 mm.
4) In the aforementioned state, loosen the setscrew in the hook driving
shaft sprocket and adjust the timing mark engraved on the feed rocker
cam to the timing mark engraved on the feed rocker rod.
(Caution)
In this case, the hook timing (thread trimming timing for the
machine equipped with a thread trimmer) changes. Be sure to perform
re-adjustment.)
B. Adjusting procedure with the gear box cover attached (For fine
adjustment) (A-SS,A-DS)
1) Set the feed amount to "0" mm.
2) Adjust the marker line engraved on the thread take-up to marker line
J engraved on the face plate.
3) In the aforementioned state, loosen the setscrew in the hook driving
shaft sprocket. Now, turn the hook driving shaft to adjust so that the
feed dog comes down. Adjust so that the top surface of the feed dog is
aligned with the top surface of the throat plate when the feed dog comes
down.
*
There is a slight inclination at the feed dog. Adjust the feed dog so that
"0" to 6 teeth come out from the top surface of the throat plate.
(Caution)
After the aforementioned adjustment, "hook timing" and
further "thread trimming cam timing" for the machine equipped with a
thread trimmer will change. Be sure to re-adjust them properly.
Results of Improper Adjustment
™ Perform the adjustment of the
inclination of the feed dog according
to the sewing process.
(Example)
™ When the feed force is required in
such a process of tape attaching or
the like :
Adjust so that this side of the feed
dog is raised.
™ When using the slippery material in
such a process of attaching a facing
of girdle :
Adjust so that the feed dog should
be leveled.
Results of Improper Adjustment
™ For the adjustment of A-DU and A-
SU, refer to (5) Adjusting the
slippage of materials and adjusting
the feed timing.
™ For the adjustment of A-SR, refer to
2) Adjusting the feed timing.
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