6. Matching
the
double
chain
looper
(In case of MO-816)
O Loosen the double chain looper set screw (l)
and
A:
Adjust
so
that
the
standard
radius
of
the
double
chain
looper
(2)
becomes
64.5
mm
(2-17/32")
(as high as possible as long as it
doesn't touch the feed dog).
B:
Adjust
so
that
it
slants
1.5
mm(l/16")
as
viewed from
top
and lightly tighten the
set
screw ®
Next,
loosen
the
set screw (3)
and
adjust
so
that:
A: When
the
double
chain
looper
(2) moves
from
left
to right, the clearance between the
blade
point
and
backside
of
the
needle becomes
0.05—0.1
mm.
B: When
the
double
chain
looper
has
reached
the
extreme
left
position,
the
distance
between
the blade
point
and
the
center
of
the needle
becomes
2.5mm(3/32")
by adjusting
the
double
chain looper support arm ® . Then, tighten
the
set
screw lightly.
When
all
of
the
above
adjustments
are
com
pleted,
verify
that the
double
chain
looper
®
moves from
left
to right and when the hole
at the tip
of
the double chain
looper
comes to
the
center
of
the
needle
that
the
hole
of
the
double
chain
looper
and
the
needle
eye
meet
each
other
as viewed
from
the
top
of
the
slant.
Then, securely tighten the set screws (D and (3).
Double
chain
looper
7.
Adjusting
the
chain
looper
thread
cam
(in
case
of
MO-816)
When
the
needle
has
reached
its
highest
position,
adjust so
that
the right
comer
of
the straight line
part
of
the chain looper thread cam (2) matches
with the
upper
surface
of
the chain looper thread
guide (D . Loosen the chain looper thread cam
screw (D and adjust the cam.
8.
Adjusting
the
double
chain
looper
avoiding motion (MO-816 Series)
Depending
on
the
size
and
number
of
needle,
the
double
chain
looper
avoiding
motion
can be
changed
as follows:
1.
Fore
and
aft looper avoiding
motion
0.05—0.1mm
Looper
avoiding
motion
Number
of
needle
For
heavy
weight
materials
(MO-816-DH6,
FF6
Series)
2.80
-
3.06
mm
#14
-
#21
For
standard
weight materials
(MO-816-DD4
Series)
2.64
-
2.85
mm
#7
-
#16
2.
Adjusting
method
O Remove the cover (D in the back of machine.
@ Loosen the screw®of the chain looper shaft slide arm.
0 Insert a bar of 2 0 into the hole oKBand rotate it.
Whenthe mark©is in front looper avoidingmotion is least
When the
mark©is
in the
opposite
side
looper
avoiding
motion
is
greatest
O After adjustment, securely tighten screw®
-
12
-
5mm
(
I/I6')
^Needle
2.5mm
Double
chain
looper
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