3.
Adjusting
the
height
of
the
needle
When
the
needle
clamp
is at the
topmost
position,
the height
of
the overlook needle is 10 mm(25/64")
from
the
surface
of
the
throat
plate.
4b Matching
the
lower
looper
(1) Standard radius
....
66.5mm(2-5/8")
Loosen the set screw (D and adjust so
that
the
standard
radius
(distance
from
the
shaft
center
to the blade
point
of
looper)
of
the blade point
of
the lower looper ® comes to 67mm
(2-41/64").
(2)
Fore
and
aft
slant
2
mm(5/64")
Adjust
so
that
the
fore
and
aft
slant
of
the
lower looper comes to 2
mm(5/64")
and
lightly tighten screw
(D.
(3) Clearance between the looper and the needle
Standard
thread
0.05-0.1
mm
Fine
synthetic
thread
. . .
under
0.05
mm
Loosen the set screw @ , move the lower
looper
support
arm (2) fore
and
aft
and
adjust
so
that
the
clearance
between
the
blade
point
of
lower
looper
and
back
side
of
the
needle
comes
to
the
ibove
dimension.
(4) Returning
amount
of
lower looper
MO-804-0D4^
^
MO-814-BD4
J
4mm(5/32
)
MO-816-DD4 6 mm(15/64")
Next,
when
the lower
looper
comes to the
extreme
left
position,
adjust
so
that
the distance
between the blade
point
of
looper
and
the
center
of
the needle (returning
amount)
comes
to the above distance by loosening the screw
® and (D
5.
Matching
the
upper
looper
(1) Height
of
upper looper
....
llmm(7/16")
When the upper looper (D comes to the
extreme
left
position, loosen the
upper
looper
support arm set screw ® and adjust so that
the
distance
between
the
looper
blade
point
and
the
throat
plate surface
comes
to 11mm
(7/16").
(2) Next, when the upper looper is rising, adjust
so
that
the
clearance
with
the
back
surface
of
lower looper (2) comes to
about
0.1 mm
and lightly tighten screw @
(3) Protruding amount of upper looper...4mm(5/32")
When
the
upper
looper
comes
to
the
extreme
left
position, adjust so
that
the distance be
tween
the
blade
point
of
looper
and
the
center
of
the
needle
becomes
4
mm(5/32")
by loosen
ing
set
screw
(3)
(4)
At
this
time
re-verify
that
the
distance
between
the
blade
point
of
the
upper
looper
and
the
throat
plate
surface is 11
mm(7/16")
and
then
securely
tighten
the
set
screw (3)
and
set
screw @
(5)
Lastly, be absolutely sure
that
the
upper
looper
is
correctly
matched
and
it is
not
touching
the
needle
or
lower
looper.
l0min(2S/64")(MO-804)
In case
of
single
needle
10tnm(
25/64")
(MO-814)
u
10mm(25/64")<MO-8I6)
I
In
case
of
twin
needles
J ® /
W 2
mm
®—
(D-n
(4>i
fjj^\
Overlook
needle
—
j
4mm(5/32")
h-
(804-814)
^
6mm(15/64')
Q
Lower
looper
\ 0
.05—0
.limn
• ~ ±
—r
4 mm Jto" )
f
0
/
(3)
—
Needle
/ ^
11mm \
\ \
\ \
1
Throat
plate
1
0
0 J
0
-
11
-
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