3.
MOVEMENT
OF
THE NEEDLE AND THE SEWING HOOK
(1
I
Timing
of the needle
and
the sewing hook (Fig.21A &
21
B)
Set
the
feed
amount
to
2mm(5/64"),
and remove
the
throat
plate.
o When the needle has gone
up
2mm(5/64
11
) from it's
bottom
dead point,
the
timing
of
the needle and
the
sewing
hook
is
as shown
in
Fig.
21
A.
0 When
the
points
of
left and right sewing hooks coincide
with
the
center
lines
of
their needles,
the
clearance between each
hook
point and
the
needle face
is
0.05mm
as shown in Fig.21B.
o The
hook
point must point
at
a higher level
by
1.2mm(3/64
11
)
than
the
top
edge
of
needle eye as shown in Fig.21A.
2mm
0.05mm
Fig.
21A
Fig.
218
(Note)
The upper engraved marking line on
the
needle
bar
will coincide with the
bottom
surface
of
the
needle
bar
frame, when
the
needle bar
is
at
the
bottom
dead point.
The lower engraved line
thereon
will coincide with the
bottom
surface
of
the
frame,
when the needle bar has gone up by
2mm(S/64
11
) from it's
bottom
dead point.
-12-
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