Baby Lock BL4-428 Instruction Booklet page 24

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The stitch pattern for
two-thread
serging has a
slightly different
appearance
from that of
three-thread
sewing. When tension is properly
set,
the
needle thread forms
flat
overcasting loops on the
under-
neath side
of
the
fabric, while the lower
looper thread
creates similar stitches
on the
top
side
of
the
fabric.
Both
threads
lock together at the
cut
edge
as
well
as
at the stitching line. (Figure
59)
The tension
on
each thread is controlled by
its color-coded tension dial. Turn the dial to
the
right
(clockwise)
to tighten or
increase the
tension. Turn the dial to
the
left (counter-clockwise)
to
loosen
or
decrease
the tension. The chart on
page
41
indicates
suggested range
of
tension numbers for
two-
thread stitching. Note
on
this chart the
specific settings
for your
own machine.
The pictures below illustrate
some incorrect
thread tension for two-thread stitching
and the necessary
adjustments
to
correct them.
Perfect
Seam - 2-thread
Needle thread
Lower
looper thread
Back
Face
Figure 59
Unbalanced
Needle thread
laps
round
over the face
Back
Face
Tighten
Loosen
Blue
Adjuster
Figure
6O
Unbalanced
Lower looper thread
laps round
over
the
back
Back
Face
Loosen
T¡ghten
Figure
61
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