REGULATING
THE
THREAD
TENSIONS
For ordinary stitching, the tension of the upper and lower threads should
be equal so as to lock
both
threads in the center of the fabric. If the
tension
on
either
thread
is
stronger
than
on
the
other,
innperfect stitching
will
be
the
result.
If the tension on the upper thread is greater than that on the lower thread,
it will be straight along the upper surface of the fabric.
If the tension on the lower thread is greater than that on the upper thread,
the
lower thread will lie straight along the underside of the fabric.
Fig. 13
Perfect stitching
^ Tight tension of needle thread
Loose
tension
of
needle
thread
Fig. 12
A.
TENSION
OF
THE
UPPER
THREAD
To adjust
the
tension of the
upper
(needle)
thread,
turn
the
serrated
nut
(1) to
the
right
for increasing tension. If
you
desire to de
crease
it,
turn
the
nut
to
the
left.
B.
TENSION
OF
THE
BOBBIN
THREAD
To
increase
the
tension,
turn
the
screw
(1)
to
the
right,
and
to
decrease
it turn
the
screw
to the left by a
screw
driver.
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