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Adjustment procedures
Results of Improper adjustment
1. Adjusting the height of the feed dog
(1) Loosen setscrew
❼
in the differential feed dog and setscrew
❸
in the main feed dog, and adjust the height.
(2) Adjust the top surface of throat plate
❶
and the height of the
rear end of main feed dog
❷
to 1 ± 0.1 mm when feed dogs
❷
and
❹
come to the highest position, and fix the main feed dog
with setscrew
❸
in the main feed dog.
(3) For the height of differential feed dog
❹
, adjust the height of
front end
❺
of main feed dog
❷
and rear end
❻
of differential
feed dog
❹
, and fix the differential feed dog with setscrew
❼
in the differential feed dog.
2. Adjusting the tilt of the feed dog
(1) Remove 10 setscrews
❾
in bed top cover
❽
, and remove bed
top cover
❽
.
(2) Adjusting procedure of the tilt
1) Loosen setscrews
in the feed lift lever.
2) When turning collar
in the direction of A, the feed dog
moves in the direction of C and is in the front-up state.
3) When turning collar
in the direction of B, the feed dog
moves in the direction of D and is in the front-down state.
4) After the adjustment, tighten setscrews
in the feed lift
lever.
(Caution) After the adjustment check the height of feed dogs
❷
and
❹
.
◦ When the position of the feed
dog is high, stitch skipping, de-
fective chain-off, return of feed,
etc. will be caused.
Throat plate comes in contact
with feed dog and damage of
components or abnormal noise
will be caused.
◦ When the position of the feed
dog is low, the stitch length be-
comes short when the sewing is
finished and performance of get-
ting over the overlapped section
is deteriorated.
◦ When the position of the feed
dog is excessively low, looper
and feed dog may come in con-
tact with each other.
◦ When the tilt of the feed dog is
raised toward you, performance
of catching material is improved.
◦ When the tilt of the feed dog is
lowered toward you, it is effec-
tive in irregular stitches and
puckering.
