Singer 1640 - Checkin G Tension of Upper Thread

An
important
point
when
sewing
is
to
make
sure
that
the
thread
tension
is
correct.
The
Thread
Tension
Dial
is
marked
with 0 to
9.
Normal
thread
tension
is
obtained
by
setting
the
Dial
at
5
against
the
top
hook.
Your
machine
has
been
tested
using
the
thread
supplied,
and
with
the
Dial
set
at 5.
It
might
prove
necessary
to
adjust
the
tension
slightly
when
using
threads
or
fabrics
of
different
thick
ness.
By
Turning
Thread
Tension
Dial
counterclockwise
close to
0,
upper
thread
will be
pulled
down
below
and
lower thread
lies
straight.
By
turning
dial
clockwise
close
to 9,
upper
thread
will be
straight
and
lower
N
thread
forms
loops
on
the
top
side.
(Fig.
22)
Thread
tension
is
correct
when
stitch
Tighter
knots
occur
in the
mid-layer
of ma
terial.
Before
sewing
garment,
try
to
make
a
sample
on a
double
folded
scrap
of
material
with
which
to
test
various
tensions
by
sewing
to
make
certain tension
is correct.
A
TENSION
OF
UPPER
THREAD
Correct Stitch
Upper
Thread
Tension too
strong
Upper
Thread
Tension
too
weak
Fig.
22
—15—