AdJustment Procedures
Results of Improper Adjustment
1)
Adjust the height of main feed dog 8 to dimension A with o
If
the feed dogs are too high, the
setscrew
0.
needles will be deflected and
2)
Adjust the height of differential feed dog 8 with setscrew O so
broken
when sewing heavy-
that there is no difference
in
level between main feed dog 8
weight materials. The feed dogs
and differential feed dog
8.
will
tend
to
suffer
scratches
3) Adjust the height of auxiliary feed dog
8 with setscrew O so
when
sewing
light-weight
that it is 0.5
mm
lower than main feed dog
8.
materials.
Puckering
will
frequently occur.
o If the feed dogs are too low,
insufficient
feed
power
will
result
o If the auxiliary feed dog is too
high, chain-off thread
will
be
often jammed.
o
If
the
main
feed
dog
and
differential feed dog are set at
different
heights,
proper
differential feeding action will be
hindered.
1) Use the tilt of the feed dog when it
is
in its highest position as a
c When tilted with the front
up
reference
and
adjust so that the feed dog is flush with the throat
Good material catching will be
plate when
the
feed dog juts out the throat plate.
obtained.
2) Feed
bar
shaft O consists of an eccentric shaft. Loosen
o When tilted with the front down
setscrew
t)
to
perform adjustment.
Uneven feed and puckering
will
When the marker line is set at middle
be effectively prevented.
..... 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
direction).
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.
-25-
From the Library of Superior Sewing Machine & Supply LLC
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