– 33 –
1. Adjusting the height of the feed dog
(1) Loosen setscrew
in the differential feed dog and setscrew
in
the main feed dog, and adjust the height.
(2) Adjust the top surface of throat plate
and the height of the rear
end of main feed dog
to 1
±
0.1 mm when feed dogs
and
come to the highest position, and fix the main feed dog with setscrew
in the main feed dog.
(3) For the height of differential feed dog
, adjust the height of front
end
of main feed dog
and rear end
of differential feed dog
, and fix the differential feed dog with setscrew
in the differential
feed dog.
2. Adjusting the tilt of the feed dog
(1) Remove 10 setscrews
in bed top cover
, and remove bed top
cover
.
(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
and
.
o When the position of the feed dog
is high, stitch skipping, defective
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.
o When the position of the feed dog
is low, the stitch length becomes
short when the sewing is finished
and performance of getting over
t h e o v e r l a p p e d s e c t i o n i s
deteriorated.
o When the position of the feed dog
is excessively low, looper and
feed dog may come in contact
with each other.
o When the tilt of the feed dog is
raised toward you, performance
of catching material is improved.
o When the tilt of the feed dog is
lowered toward you, it is effective
i n i r r e g u l a r s t i t c h e s a n d
puckering.
A
B
Adjustment Procedure
Results of Improper Adjustment
Summary of Contents for MF-7800D Series
Page 64: ...60 5 Adjusting the upper knife stroke A B Standard Adjustment H21...
Page 66: ...62 MEMO...
Page 80: ...76 3 Adjusting the elastic band presser plate 0 5mm Standard Adjustment E10 A A Approx 7 5 mm...
Page 84: ...80 MEMO...
Page 94: ...90 3 Setting of SC 510 2 Change of the setting Type B Type A Standard Adjustment UT25...
Page 114: ...110 MEMO...
Page 118: ...114 2 Installing SC 510 1 Wiring SC 510 Standard Adjustment UT22...
Page 124: ...120 MEMO...
Page 134: ...130 MEMO...
Page 142: ...138 7 Feed timing of the roller A Standard Adjustment PL11 C D B...
