TO
TIME
THE
HOOK
The hook point "AR",
Fig.
21
should be at the center
•^;ie
ofthe needle
when
the
timing
mark
0
"AT",
Fig.
22
the face plate
is
in
line
with
the
timing
mark
"AU",
Fig.
22 on the rotary take-up. The needle should clear
the
hook
point
and contact the needle guard
"AS",
Fig.
21
without deflection.
For
proper
timing
of the hook
remove
the presser
foot,
the slideplate,the throat plate, the feed dog and
the
bobbin
case.
Make
certain that the
height
of the
AR
AS
Figure 21
needle bar has been set correctly.
Insert
a new needle
into the needle bar, loosen the two set screws in the hub
of
the
hook
and
while
holding
the
machine
pulley
(kee
ping the timing marks matched) rotate the hook until
the hook point is at the center line of the needle.
Re-
tighten the hook set screws.
Check
the clearance between the hook point and the
needle in the extreme positions of the widest bight.
AT
AU
Figure 22
Caution: The hook point should pass the needle as
closely as possible without, however, touching it.
The function of the needle guard is to prevent hook
point
damage
when the
needle
is deflected into the
path of the hook point. Whenever the hook has been
replaced check the needle
guard
for proper adjustment.
13
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