Adjustment Procedures
1) Loosen setscrew 8
in
the
top
feed dog and move top feed dog
8 up or down to adjust the height.
(Caution) 1. Perform the adjustment
in
the state that the
standard top feed pressure is applied.
2.
Top
feed dog 8 is removed and personal
injuries
may
occur. Use a
rather
large-sized
screwdriver and securely fix setscrew 8 in
the top
feed dog.
-47-
Results of Improper Adjustment
o When top feed
dog
Is installed
higher than
the
standard
Sewing
of
heavy-weight
materials is possible.
However,
a
clearance
is
provided
between
top and
bottom feed dogs, and partial
shirring performance of light-
weight materials or feed force
is decreased.
o
When
top
feed
dog
is
installed
lower
than
the
standard
Partial shirring performance
or
feed
force
is
increased.
However, when overlapping
amount of top and bottom feed
dogs is excessively increased,
feed
dog
defect is apt
to
occur.
Besides, sound may become
higher.
o
In
case
of
sewing
heavy-weight
materials
It
is
possible to sew even when
vertical stroke is increased.
Refer
to
a(27)
Vertical
momentum
of the top feed
dog~.
r
.I
I
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