White 671 - Adjusting Thread Tensions

To regulate
the
tensions
For ordinary
stitching,
the
tension on
the
upper and
lower
threads should
ba
equal
so as
to
lock
both
threads
in
the
center
of the fabric.
thus:
If the
tension
on
either
thread
is stronger
than on
the
other,
imperfect
stitching
will
be the result.
If the tension on
the upper
thread is
greater than
that on the
lower thread.
it
will lie straight along
the
upper
surface
of the fabric,
thus:
If the
tension on
the lower
thread
is
greater
than
that on the
upper thread,
the
lower thread will
lie
straight
along
the
under-side
of the
fabric,
thus
:
Tension
‘i
the
upper
thread
The
sewing
machine
will
give
perfect
per
formance
when
the
upper thread
tension
is correctly
adjusted.
A) The tension
on
the upper thread
be
comes
stronger
when
the tension-dial
is turned
in
the direction
marked
(±).
(Fig.
17)
(Fig.
17)
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