(3)
Adjusting
the
center knife stroke
,,,
1.
The center
knife
stroke should be approximately 6.6 mm.
(Check)
Set
the
power and
the
air
supply
to
OFF.
While raising
the
link
ball 0 by hand,
turn
the
pulley
to
move
the
center
knife@
up and down. ·
At
this time, make sure
the
center knife
@stroke
is
approximately 6.6 mm. When
the
center
knife
8
is
at
its
up
position,
the
gap between
the
needle plate
top
and
the
corner
of
the
center knife @ should be 4
mm.
(Adjustment)
a.
Set
the
power and
the
air
supply
to
OFF.
While raising
the
link
ball 0 by hand, set the pin @ all
the
way
to
the
right
inside
the
channel
of
lever stopper
0.
Turn the pulley
to
move
the
center knife 8
to
its
down
position, then stop
the
pulley.
b.
Loosen
the
screw @
in
the
drive arm
@.
Change the angle
of
the upper knife rock shaft 8
so
that
the
center knife @
is
4 mm above
the
needle plate top. Tighten
the
screw
€).
At
this time, check
that
the
needle clamp does
not
hit
the
center knife holder by
turning
the
pulley.
c.
Check
that
the
stroke
is
6.6 mm.
2.
Make sure
that
the
center knife @ reaches its
down
position
with
a slight delay after
the
needle bar
reaches its
down
position.
(Adjustment)
Make sure
the
screw
@)
in
the
eccentric wheel @
is
properly positioned
to
the
screw stop in
the
arm shaft.
If
it
is
not, reset
the
screw@).
* The gap between
the
center knife 8 and
the
needle should be 5.5 mm.
Center
knife@
ON
timing
Small gauge (8,
10, 12,
14mm)
Large gauge (
16,
18,
20
mm)
Center knife
compensation
0
Compensation
( 1 increment)
l1 =
82
=
5.5
mm-approx. 0.3 mm
l1 =
62
= 9.4 mm-approx. 0.3 mm
r--seam
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/
_____
_
_J
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--------------------
--L
.e1
.e2
-60-
Compensation 9
8.5mm
12.5 mm
From the library of: Superior Sewing Machine & Supply LLC
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