Newlong DS-9C - Machine Adjustments: Looper; Looper Timing and Height Adjustment

5.
Adiustins/ffi
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3.
Looper
a)
Distance
between
Needle and
Looper
Turn
the
pulley
in the
forward
direction
and
adjust the
bell
crank so
that the
end ofthe
looper
is 7mm
away from
the
needle center
when
the needle
is in
the most
retracted
position,
as
shown
in
(Fie.4).
The
distance
between
the
nut
(outside)
of Looper
Connecting
Rod
must be
38.5+
0.3mm.(Fis.4)
Upon completion
of
the
adjustment,
tighten
the screw
of
the bell crank.
b) Gheck
of Height of Needle
Needle
and
looper movements
are correctly
timed
if
distance
(A
and A'
of Fie.4)
between
Looper
point
and
Needle
hole
when
Looper
points
gets
in line
with
left-side
edge
of
Needle is the
same
as Looper
passes
Needle in
forward
and backward
movements.
A-A'
+
0.3mm is
allowable.
Adjust by hiehtly
tapping the
looper
Drive
Lever.
Looper eyelet
should overlap
with lower
part
of
oval hole of
Needle, as shown
in
(Fig.5-c.)
as
looper
goes
forward. Adjustment
can
also
be done by loosening
the set
screw ofthe
needle bar
connecting
stud and adjusting
the
height of
the needle bar
so that
the end of
the needle
is
15.5mm
from
the
upper surface of
the throat
plate
as
shown in
(r'ig.o).
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Fig.5-o
Fig.5-b