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UNDER LOOPER MECHANISM
CD
Procedures
I Remove needles and needle plate.
2 Temporarily fasten under looper holder
0
on
under
looper lever shaft
8 .
3 Insert under looper 0
all
the way into
under
looper
holder
O.
4 Measure under looper 8 tilt
at
its point and
bottom,
adjust it until the measurement difference
is
in
the
range
of
1
to
1.5 mm, and
then
fasten under looper 8
with screw (D.
5 Install the standard needle for adjustment into needle
clamp.
Ill The below items
of
8 and
fj
should be taken
simultaneously.
6 In case
of
sewing machines made to the standard
specifications, adjust the distance between the under
looper point and the needle center to 4.5
mm
when the
under looper
is
at
the left most position. The sewing
machine
of
the high-lift specifications must be adjusted
to
a distance
of
2.2mm
between them. (Sidewise
positioning)
I Safety Stitch I In case
of
standard specifications,
that
distance
is
4.7mm.
In case
of
high-lift specifications,
that
distance
is
2.2mm.
7 With the point
of
under looper in line with the center
of
needle, make an adjustment
so
that
the point
of
under looper will push needle 0.01
"'0.05mm
{i.e.,
slightly contact needle) in the upward travel
of
needle.
However,
in case
of
sewing for thick materials, must be
adjusted to
touch
about 0
to
0.05 mm between them.
(Longitudinal positioning)
* 0.05
to
0.07mm
for
cotton
fabrics; 0.08 to O.l·mm
for chemical fabrics.
I Twin Needles I Iqstall the right needle into needle clamp,
loosen screw for needle bar clamp,
turn
the needle bar until the under looper
point hits
both
needles
by
approximately
the same
depth
or
the right needle slightly
deeper, and
then
retighten screw for
needle bar clamp. Also check the height
of
needle bar at the same time.
Q'ty
of
screw
(See the figure at right.) -
18-
Scale
slightly contact needle
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