– 21 –
o If the feed dogs are too high, the
needles will be deflected and
broken when sewing heavyweight
materials. The feed dogs will tend
to suffer scratches when sewing
light-weight materials. Puckering
will frequently occur.
o If the feed dogs are too low, in-
sufficient feed power will result.
o If the auxiliary feed dog is too
high, chain-off thread will be of-
ten jammed.
o If the main feed dog and differ-
ential feed dog are set at differ-
ent heights, proper differential
feeding action will be hindered.
1) Adjust the height of main feed dog
to dimension A with setscrew
.
2) Adjust the height of differential feed dog
with setscrew
so that
there is no difference in level between main feed dog
and differen-
tial feed dog
.
3) Adjust the height of auxiliary feed dog
with setscrew
so that it is
0.5 mm lower than main feed dog
.
o When tilted with the front up
Good material catching will be
obtained.
o When tilted with the front down
Uneven feed and puckering will
be effectively prevented.
1) Use the tilt of the feed dog when it is in its highest position as a
reference and adjust so that the feed dog is flush with the throat plate
when the feed dog juts out the throat plate.
2) Feed bar shaft
consists of an eccentric shaft. Loosen setscrew
to perform adjustment.
When the marker line is set at middle
.....The feed dog will be flat.
When the marker line is set at bottom
.....The feed dog will be tilted with its front up (in the arrowed direc-
tion).
When the marker line is set at top
.....The feed dog will be tilted with its front down.
(Caution) The marker line should be used just as the reference since
it slightly differs with that of each machine due to the
disparity of the components.
Confirm the accurate tilt of the feed dog by observing
the feed dog itself.
Adjustment Procedure
Results of Improper Adjustment
Adjustment Procedure
Results of Improper Adjustment
Summary of Contents for MO-6700D Series
Page 49: ...45 2 Upper looper components...
