Singer 281-30 - MACHINE TIMING AND HOOK CLEARANCE; Timing the Sewing Hook; Setting Needle-Hook Point Clearance

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18
CLEARANCE
ABOVE EYE
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HOOK
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POINT
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MARK
LEVEL
WITH
BOTTOM
OF LOWER
NEEDLE
BAR
BUSHING
Fig.
44.
Hook
Point
at
Center
of
Needle
Fig.
45.
Hook
Body
Screws
Fig. 46. Clearance
Be"tween
Needle
and
Hook
TIMING
THE
MACHINE
Timing
the
machine
consists
of
first
adjusting
the
radial
position
of
sewing
hook
with
relation
to
move-
ment
of
needle
bar
and
needle
thread
toke-up
lever,
to
make
certain
that
loop
of
thread
formed by
needle
will
be
correctly
taken
by
point
of
hook
at
proper
time.
The
check
spring
and
feed
ore
then
timed
to
syn·
chronize
their
motions
with
needle
and
hook
movement.
TIMING
THE
SEWING
HOOK
MACHINE
231.5:
Remove
bed-raising
plate.
MACHINES 281-22 AND 281-24:
Make
certain
that
timing-indicator
pin
is
correctly
set
in
needle
bar
frame,
as
instructed
on
page
17.
ALL
MACHINES:
Remove·
s
fide
plate,
throat-
plot~~
presser
foot
and
feed
dog.
Turn
machine
pulley
over
toward
operator
until
needle
bar
reaches
its
lowest
point
and
rises
to
posi-
tion
where
LOWER
TIMING
MARK
on
needle
bar
is
level
with
bottom
of
lower
needle
bar
bushing,
as
shown
in
Fig.
44.
(On
Machines
281-22
and
281-24,
LOWER TIMING MARK
should
be
level
with
timing-
indicator
pin
shown
in
Fig.
42,
page
17).
At
this
position,
point
of
sewing
hook
should
be
at
center
of
needle,
as
shown
in
inset,
Fig.
44.
Loosen
two
hook
body
screws
shown
and
turn
hook
on
shaft
as
required
to
bring
point
of
hook
to
center
of
needle.
See
Fig.
45.
Make
certain
that
hub
of
hook
is
against
oil
re-
taining
collar
and
tighten
hook
body
screws.
Check
clearance
between
needle
and
hook
point,
in
accordance
with
the
fol
lowing
instructions.
SETTING
THE
CLEARANCE
BETWEEN
NEEDLE
ANO HOOK
POINT
MACHINE28l-5:
Remove
bed-raising
plate.
ALL
MACHINES:
Remove
slide
plate,
throat
plate
and
bobbin
case.
Check
to
see
that
needle
is
properly
seated
in
needle
bar
and
time
sewing
hook
as
previously
in-
structed.
Point
of
sewing
hook
should
poss
needle
as
closely
as
possible
without
striking
or
deflecting
needle.
A
clearance
of
about
the
thickness
of
o
piece
of
note
paper
(approximately
.005
inch),
as
shown
in
Fig.
46,
is
sufficient.
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