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An ideal straight stitch will have
threads locked between the two
layers of fabric.
Upper thread
too tight
Decrease tension
®
Upper
thread too loose
Increase Tension
)
ADJUSTING
TOP THREAD
TENSION
Probably
the most important
control
on your
machine
is this one that regulates your top
thread tension.
There are many reasons for having to reset
your tension. The best tension for one fabric
may not I_e correct for another. The required
tension depends
upon the stiffness
of the
fabric,
thickness
of the fabric,
numbers
of
layers of fabric being sewn, as well as the
type of stitch you are making.
It is best to test the stitching on a scrap of the
fabric you are using before starting to make a
garment.
Use the straight stitch function
as
shown at the right.
Increase
Decrease
ADJUSTING
BOBBIN
THREAD
TENSION
When stitching
is unsatisfactory
in figures 2
and 3 above, adjust the upper thread tension.
LOWER
THREAD
TENSION
REQUIRES
ADJUSTMENT
LESS FREQUENTLY
THAN
THE UPPER THREAD
TENSION.
When stitch is satisfactory,
as in Fig. 1 and
seam is badly puckered,
the cause may be
tight tensions and both upper and lower may
have to be adjusted.
When
adjusting the tension
on the bobbin
case, make slight adjustments
with a screw-
driver.
12
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