OPERATION
12 Timing between rotating hook motion
and
needle
motion
(1) Set feed length (stitch length) to
"6"
on the
feed
setting
dial.
(2) When
needle
is
lifted
2.4mm
from
the
lower
dead
point,
as shown in Figure, the follow
ing positional relationship should be main
tained.
—The
upper edge of needle eye should be
2.3mm
below
the
hook
point.
—The hook point should be located at the
center
of
needle
axis.
—Gap
between the hook point and the side
face
of
needle
should
be
0.05mm.
(3) Needle/rotating hook position can be ad
justed
as
follows.
(For easy adjustment, it is recommended
that
the presser foot,
throat
plate and feed
dog assemblies are removed.)
•
Positioning
of
hook
point
(1)
When
the
needle
is
at
DOWN
position,
the
smaller
crossed
herical
gears
on
the
right
side
and
left
side
should
be
engaged
with
the
larger wheel so
that
the
"S"
screw
of
the
former
gear
comes
on
the
front
side,
and
that
of
the
latter
gear
on
the
reverse
side.
(2)
Tighten
each
"S"
screw,
where
is
punched
for
set
screw,
on
the
hook
shaft.
(3)
Approximate
position
of
hook
"C"
screw
of
hook
should
be
found
close
to
the
needle
when
the
needle
is
at
DOWN
position.
•
To
finely
adjust
timing
between
the
needle
motion
and
hook
motion,
loosen
the
set
screw
of
larger
gear
wheel
and
move
the
gear
wheel
in its
axial
direction
within
a
range
from
1
mm
to
2mm.
-9
-
Gap
between
hook
point
and
upper
edge
of
needle
eye
2.3mm
Needle
lift:
"An
2.4mm from ^
needle lower ^
dead
point
Center
of
needle
axis'
Hook
point
) ^
1 ~
2mm
Needle
DOWN
position
0.05mm
1 ~
2mm
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
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