Preparation
for
operation
III.
PREPARATION
FOR
OPERATION.
1.
2.
8
SELECTION
OF
THREAD
Always use left-twist thread for upper thread. In
order to check if a thread is right-twist or left-twist,
hold
the
thread
as
shown
in
illustration
and
twist
it
toward
you
with
your
right
hand
thumb
and fore-
iinger;
if
the
twist
loosens,
the
thread is right-twist
and if
it
tightens, the thread is a left-twist.
HOW
TO
INSERT
THE
NEEDLES
(Use.Cat. No. 1901)
a. Rotate the machine pulley toward you so as to
raise the needle bar to its highest position.
b.
Ihen
loosen the needle clampingscrew.
c. Hold the needles so that the long grooves are
facing inside as illustrated, then insert the
needles as deeply as possible
into
the needle
clamping holes.
d. Clampneedlessecurelyby tighteningthe needle
clamping screws.
METHOD
OF
THREADING
THE
UPPER
THREAD.
The upper thread is passed according to the
following;
a. Raise the thread take up lever to its highest
position
and
pass
the
thread
in
the
order
of
the
numbers
^own in Fig.
b. Threading the thread from the left side spool.
(LI)
Threadguide^eft-(top cover)
(L2) Thread retainer (upper hole)
(L2*) Guide pin (right)
(L3) Pre-Tension (upper)
(L3') Guide pin fleft)
(L4) Tension regulator (upper)
(LS) Thread controller disc (back)
(L6) Thread tension
^ring
(8) Thread guide (upper)
(L7) Take up lever hole (upper)
(8) Thread guide (upper)
^)
Thread
guide
(middle)
(10) Thread guide (lower)
(LI1) Thread
jguide
hole4eft-(needle clamp)
ai2)
Needle Ceft)
c. Threadingthe thread from the right side spool
(Rl)
(R2)
(R3)
(R4)
(R5)
(R6)
(8)
(R7)
(8)
(9)
(10)
(Rll)
(R12)
Thread guide-right-(top cover)
Thread retainer (lower hole)
Pre-tension
(lower)
Tension
regulator
(lower)
Thread
controller
disc
(front)
Thread tension spring
Threadguide (upper)
Take up leverhole Oower)
Thread
guide
(upper)
Thread guide (middle)
Thread
guide
(lower)
Thread guide hole-rlght-(needle clamp)
Needle (right)
t Pass the thread on (3) pre-tension & (4) tension
regulator between its two discs, and (12) two
needle
from
in
side
to
out
side.
Needle
clamping
screw
M
Needle
clamp
Long—-
groove
faces
(inside)
(L7)
(L5)
(L3')
<L1)
m
"(Rll)
-(R12)
