3.
ON
SAFETY
a) Alway turn
off
power supply before threading,
oiling, adjusting, or replacing parts.
b)
Wear
safety glasses.
c)
Make
sure that all the covers
and
guards are placed
in
position before starting the
mach.in·e.
d) Keep your hands
off
the machine while
it
is
in
operation.
4.
ADJUSTMENT
4-1
Looper
a) Timing
of
Looper and Needle
Turn the handwheel counterclockwise (in the direc-
tion
of
operation), and check
the
crosswise move-
ment
of
the looper
(B,
Figure 4)
with
regard
to
the
needle (C, Figure 4). The looper
and
the needle are
correctly timed
if
the vertical distance from the
looper point (See Fig. 5)
to
the
needle hole, meas-
ured when the looper point
is
in line with the left-
side edge
of
the needle
as
the looper moves forward
(to
the left)
is
the same
as
that
when measured
as
the looper goes back (toward
the
right) (See Fig. 5).
Deviation
of
±0.1
mm
is
allowable.
If
the distance
as
measured when the looper
is
moving
to
the left
is
larger than that measured
wh.en
the looper
is
moving back
to
the right,
move
back the looper
drive rocker shaft (D, Figure
4),
and
when
it
is
smal-
ler, move it forward.
-4-
To adjust the position
of
the looper drive rocker
shaft, first loosen the fastening screw
(F,
Figure
4)
of
the looper drive lever (I, Figure 4). Mount the rod
.146-40 or the screw 22870A on the bell crank shaft
through the thrust adjusting screw (H). Slightly tap
or pull the shaft
as
required to obtain the required
timing
of
needle and looper. After the adjustment,
tighten the fastening screw (F).
To adjust the screw (H), loosen
both
the lock
nut
(G)
and the adjusting screw (H). First tighten the adjust-
ing screw (H) with 7 kgjcm, and then the lock nut
firmly.
Fig. 5
From the library of: Superior Sewing Machine & Supply LLC
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