ADJUSTMENT
OF
THREAD
TRIMMER
1.
INSTALLATION
OF
MOVABLE
KNIFE
1.1
Initial
Position
of
Movable
Knife
(1)
Turn
the
balance wheel by hand until
the
needles reach
their
lowest position.
(2) With
the
needles at this position, push
the
cam follower crank
to
locate
the
cam roller
onto
the
thread
trimmer
cam
groove.
(3) In
this
state,
turn
the
balance wheel and
stop
it at
the
point
where
the
black
point
on
the
arm is aligned with
the
white point on
the
balance wheel. At this time, make
necessary
work
on
the
cam follower crank using screw
and
screwdriver to prevent
the
roller
from
slipping
out
of
the
cam
groove.
(4)
Loosen
the
bolts
"A"
and
"B"
on
the
thread
trimmer
rocking
crank.
(5) Adjust
the
movable knife so
that
its slant
portion
protrudes
0
to
0.5
mm from
the
fixed
knife
blade
as
illustrated
in
the
figure.
Then
tighten
the
bolts
"A"
and
"B".
Thread
trimmer
rocking
crank
Bolt
"A
0~
0.
0
Bolt
"B"
Thread trimmer rocking crank
Movable
knife
Fixed
knife
1.2
GAP
BETWEEN
MOVABLE
KNIFE
AND
BOBBIN
CASE
HOLDER
STOPPER
(1)
Turn
the
balance
wheel
by
hand
until
the
needles
reach
their
lowest
position.
(2) With
the
needles
at
this
position,
push
the
cam
follower
crank.
Then
turn
the
bal
ance
wheel
by
hand
until
the
movable
knife
reaches
the
end
of
its
stroke.
(3)
Turn
the
bobbin
case
holder
by
hand
in
the
direction
indicated
by
the
arrow
in
the
figure.
Then
adjust
the
gap
between
the
movable
knife
and
the
bobbin
case
holder
stopper
to
approximately
0.5
mm
by
loosening
the
screws
"A"
and
"B".
18
Movable
knife->
Bobbin
case
holder
stopper
Approx,
0.5
mm
Screw
"A'
Screw
"B"
Bobbin
case
holder
From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
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