Singer 645 - Upper Threading Procedure

1. Turn
the
hand
wheel
toward
you to
raise
the take-up
lever
to
its highest
position.
2.
Place
a
spool of
thread on the
spool
pin.
3. Lead
the thread
through
the
top
thread
guides.
4.
Down
and between
the
tension
discs, from
right
to
left.
5.
Draw
the thread
up
through
the
check-spring
and
with
a
slight
tug
into the
hook.
6.
Up
and
through
the
eye
of
take-
up
lever
from
right
to
left.
7.
Lead
thread
down
through the
thread
guide at
the bottom
of
the
threading
slot,
then,
through
the
needle
bar
thread
guide
from
the
back.
8.
Thread
the needle
FROM
FRONT
TO BACK,
drawing
it
through
about
3 or 4 inches.
Hold
the
end
of the upper
thread
loosely
and
turn the
hand
wheel
toward
you
until
the
needle goes
all
the
way
down
and comes
back
up.
A
thread
loop
will form
over
the
upper
thread
which
then can
be
pulled
out straight.
Place both
thread
ends under
presser
foot
and draw toward
the back
of
the
machine,
leaving
both
threds
three or
four inches
long.
In
case
of twin
needle sewing,
place
two
spools
of
thread,
matching or
contrasting
in
color,
one on
each
spool
pin,
lead
both
threads
through
top thread
guides,
bring
threads.down
and
pass
one
thread between
the
back
discs
and
the other
between
the
front
discs,
then
treat
both
thread
as one until
threading
each
thread
through
each
needle
eye
of
twin
needle.
UPPER
THREADING
r-—-
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ZAO:
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