TO
TIME
THE
SEWING
HOOK
AND
ALSO
SET
THE
SEWING
HOOK
SIDEWISE
IN
RELATION
TO
THE
NEEDLE
PREPARATION:
Remove presser foot, slide plate, throat plate and
feed dog.
On compound feed varieties, set stitch length
to
zero (setting feed to zero is not required on drop
feed machine).
CHECK:
When lower timing mark on needle bar is level
with lower end
of
lower needle bar bushing A as
shown in Fig. 7, the point
of
the sewing
hook
should
be at
the
center
of
the
needle, as shown in Fig. 7.
Also, when point
of
sewing hook passes needle,
clearance between
hook
point K, Fig. 8 and needle
should be approximately equal to thickness
of
a
piece
of
ordinary notepaper (about .13mm), as shown
in Fig. 9.
NOTE: Not only point
of
sewing hook
but
entire
"FLAT"
of
hook
point
should clear scarf on needle
blade. Normally, a .5mm clearance is provided be
tween hub
of
hook
and oil retaining collar.
SETTING:
Loosen two set screws L, Fig. 7 in
hub
of
hook.
Then retighten one
of
the set screws very lightly so
that the sewing hook can still be turned on the shaft.
Hold shaft immovable and turn
hook
as required
to bring point
of
hook to center of needle as shown
in Fig. 7 and at the same time adjust clearance be
tween needle and
hook
point as shown in Fig. 9.
Tighten set screws L lightly, turn machine pulley
to
make certain the sewing
hook
is correctly set in
relation
to
the
needle.
Then
securely tighten set
screws
L.
LOWER
TIMING
MARK
HOOK
POINT
AT
CENTER
OF
NEEDLE
Fig. 9
ON
UPWARD
STROKE
Fig. 7
HOOK
POINT
Fig. 8
NOTEPAPER
FLAT
OF
HOOK
POINT
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