Adjusting under thread tension, Thread tension, Adjusting under thread – SINGER W311 BBS User Manual
Page 13: Tension
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A
C
A. Perfect Stitch.
B. Tight Upper Thread Tension.
C. Tight Under Thread Tension.
ADJUSTING UNDER THREAD TENSION
All machines are correctly adjusted before leaving the factory,
therefore it is seldom necessary to alter the UNDER tension.
Should
it
become
necessary
to
do
so,
tighten
the
tension
spring
screw
to
increase
the
tension
and
loosen
the
screw
slightly to lessen the tension, using the small screw driver.
THREAD TENSION
(a)
For ordinary stitching, the needle and the bobbin threads
should be locked in the center of the thickness of the
material, as illustrated (A).
(b)
If the tensipn on the needle thread is too tight, or if that
on the bobbin is too loose, the needle thread will lie
straight along the upper surface of the material, as shown
in illustration (B).
(c)
If the tension on the bobbin thread is too tight, or if that
on the needle is too loose, the bobbin thread will lie
straight along under side of the material, as shown in
illustration (C).
wmmm
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