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With
tension properly set,
the
lower looper thread forms
a
flat,
non-rolling
pattern
of
overcasting
stitches
on the
underside
of
the fabric.
The upper looper thread
forms
a
similar
pattern on
the top
side and
these
two
threads
lock together
evenly over
the
cut
edge.
The single
needle
thread (either
left
or right)
interlocks
with
the
two
looper
threads
at the stitching
line
to
create
the
seam.
(Figure 51)
The tension
on
each
thread
is
controlled
by
its color-coded tension
dial. Turn the dial
to
the
right
(clockwise)
to
t¡ghten
or
increase
tension.
Turn the dial
to
the
left
(counter-clockwise)
to
loosen
or
decrease
tension. The
chart on
page
41
indicates
suggested range
of
tens¡on
number
ranges
for
three-
thread stitching. Note on this chart
the
specific setting
for your
own
machine.
The pictures below
illustrate
some
incorrect thread
tensions
for
three-thread
stitching
and
the
neces-
sary adjustments
to
correct
them.
Unbalanced
Lower
looper thread
laps
round
over the face
Back
Face
Loosen
Tighten
Figure 54
or
Yellow
Green
Adjuster
Unbalanced
Upper
looper thread
laps
round
over
the
back
Back
Face
T¡ghten
Loosen
Figure 53
or
Yellow
Green
Adjuster
l
Perfect
Seam
-
3-thread
Needle
thread
Back
Upper
looper
th
read
Face
Lower
looper
th
read
Figure
51
Unbalanced
Needle
thread
too
loose
Back
Green
Adjuster
Bl
ue
Adjuster
T¡ghten
Face
Figure 52
21
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