5.8
Timing
of
Feed
(1) The position for
the
standard feed timing is where the needle
tip is approximately 0 to 3 mm from the upper surface of
needle plate when
the
feed dog is risen by turning
the
balance
wheel
and
the
teeth
of
feed
dog
become
flush
with
the
upper
surface
of
needle
plate.
(2) Make adjustment by the mounting positions of feed lifting
cam
feed
cam.
1)
Installation
of
feed
lifting
cam
Mount the feed lifting cam so that the first screw
(B)
of
feed lifting cam is located just at
the
side position when
the
timing
mark
@ of
rising
needle
bar
has
reached
the
lower
end
of
needle
bar
supporter
by
turning
the
balance
wheel
in
the
forward
direction.
^—
f
0
to
3
mm
Fig. 21
Needle
bar
supporter
Feed
cam
Feed
lifting
cam
2)
Installation
of
feed
cam
Mount
the
feed
cam
so that the third
screw
@ of
feed
cam
is
located
just
at
the
side
position
when
the
tip
of
rising
needle
has
reached
the
top
surface
of
needle
plate
by
turning
the
balance
wheel
in
the
forward
direction.
16
\
• Needle bar
Fig.
22
Feed
cam
Feed
lifting
cam
Needle
Needle
plate
Fig.
23
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