Baby Lock BL4-428 Instruction Booklet page 30

23-1
Three-thread
narrow rolled
edging
Use three-thread narrow rolled edging
for
a strong
seam
or
a
decorative edge
finish on light
to
mediu m-weight fabrics.
1.
Lower the stitch finger,
as
detailed
above.
2.
Tighten the lower
looper tension adjuster (blue) about
3
revolutions clockwise (right),
to about
3.5 on the numbered
scale.
When the tension
is properly
set, the
edge
of
the fabric actually
rolls
to the
underside around
the
tiny stitch finger. The upper looper thread the
wraps the
edge
of the fabric. The lower looper
thread
no longer forms loops, but pulls nearly straight
on
the
underside
of the fabric.
The chart
on
page
41
indicates
suggested range
of
tension nurnbers
for
three-thread rolled
edging.
Note on this chart the specific setting
for your
own machine.
The pictures below illustrate
some incorrect thread tensions
for
three-thread narrow rolled
edging
and
the
adjustments necessary
to correct
them.
Unbalanced
Needle
thread
too
loose
Back
Face
Tighten
Figrrre 75
Green Blue
Unbalanced
Upper looper thread
too
loose
Back
Face
ten
Figure 75
Yellow
ster Adjuster
Bl ue
Unbalanced
Lower looper thread
loose
or
upper looper thread too
tight
Back
Face
Loosen
Tighten
Figure 77
Yellow
Adjuster
l
Perfect Seam
-
3-thread rolled
edge
Lower looper thread
Back
Face
Needle thread
Upper looper thread
Figure 74
29