Singer 281-30 - UPPER KNIFE SETTINGS AND SHARPENING (Model 281-5); Setting Upper Knife to Cutting Bar; Adjusting Upper Knife Height; Sharpening the Upper Knife

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SETTING
UPPER
KNIFE
IN
RELATION
TO THE
THROAT
PLATE
CUTTING
BAR
(MACHINE
231-5)
Press
down
on
lever
shown
1n
Fig.
37,
lowering
knife.
Turn
machine
pulley
until
upper
knife
is
at
its
lowest
position.
Loosen
the
two
lock
nuts
behind
screws
shown
in
Fig.
37,
above
upper
knife.
Move
knife
holder
to
bring
upper
knife
as
close
as
possible
to
cutting
bar,
as
shown.
Securely
tighten
two
screws
and
lock
nuts,
previously
loosened.
Loosen
two
screws
B,
Fig.
37.
Using
a
screwdriver
os
shown,
press
throat
plate
cutting
bar
firmly
against
upper
knife,
setting
cutting
bar
para
I
lel
to
blade-of
knife,
as
shown
in
Fig.
37.
Securely
tighten
two
screws
B.
Check
to
make
certain
upper
knife
releases
readily
when
button
on
face
plate
is
pushed
IN.
Recheck
needle
location
in
cutting
bar
needle
hole
end
re-set,
if
necessary
as
instructed
at
bottom
of
page
14.
Then
check
and
re-set
upper
knife
as
instructed
above.
Turn
machine
pulley
over
toward
you
until
upper
knife
is
at
its
lowest
position.
Loosen
two
screws
C,
Fig.
37.
Raise
or
lower
the
upper
knife
as
required
to
bring
highest
point
of
cutting
edge
approximately
1/64
inch
below
top
surface
of
throat
plate
cutting
bar.
Securely
tighten
two
screws
C.
CAUTION:
Make
certain
that
upper
knife
does
not
strike
throat
plate
slide.
Loosen
slide
screw
and
move
slide,
os
required.
Slide
should
be
closed
without
coming
in
contact
with
knife.
Core
must
be
taken
to
keep
both
knives
sharp.
When
sharpening
the
upper
knife,
make
certain
that
10°
bevel
shown
in
Fig.
38
is
maintained,
to
insure
correct
engagement
of
upper
and
lower
knives.
l
'
LOOSEN
LOCK NUTS
BEHIND
THESE
TWO
SCREWS
B
KNIFE
HOLDER
PUSH
DOWN
UPPER
KNIFE
SLIDE
SCREW
THROAT
PLATE
SLIDE
Fig.
37.
Setti~g
Knife
in
Relation
to
Cutting
Bar
on
Machine
281-5
KEEP
10°
BEVEL
1/16":::
KEEP
10°
BEVEL
Fig.
38.
Sharpening
Knife
on
Machine
281-5
. I
15