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11
FOUR-THREAD SERGING
Your Baby Lock is
pre-set
for
four-thread
serging,
the
most common
mode
of
serger
sewing.
lt
provides
a
very
durable,
yet
fully
stretchable
seam
or
overedge
on
all
types
of
fabric.
With
tensions
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
left
needle
thread interlocks
with
the
two
looper threads
at the
stitch¡ng line
to
create
the
seam.
The
right
needle
thread,
visible
from
the top
side
of
the
seam,
interlocks
with
both
loopers
to
add
durability.
(Figure 31)
The tension
on
each
thread is controlled
by its
color-coded
tension
dial.
Each
dial turns multiple
revolutions
to
allow
maximum
control
of
the stitch. Turn
the dial
to
the
right
(clockwise)
to
tighten
or
increase
the
tension;
turn
it
to
the
left
(counter-clockwise)
to
loosen
or
decrease
tension.
The
position
of
the yellow
indicator
along
the
shaft
of
the
tension
ring
indicates
the
numerical
tension
setting.
The
chart on
page
41
indicates
the
suggested
number
ranges
for
four-thread
stitching.
Note
on
this chart
specific settings
for your
own
machine.
The pictures below illustrate
some
incorrect thread tension
for
four-thread stitching
and
the
necessary
adjustments
to
correct
them.
Yellow
i
nd¡cator
Figure
31
Perfect
Seam
-
4-thread
Right
needle
thread
Left
needle
thread
Face
Back
Upper
looper
th
read
Lower
looper
th
read
Unbalanced
Lower
looper
thread
over
the
face
round
Back
Face
Tighten
Orang€
Adjuster
Elue
Adjusrer
Unbalanced
Upper looper thread
laps
round
over
the
back
Back
Adjusrer
Blue
Adjusler
Face
Unbalanced
Right
needle
thread
too
loose
Back
Orange
Adjusrer
Green
Adjus¡er
Blue
Adjuster
Tighten
Face
Unbalanced
Left
needle
thread
too
loose
Back
Green
Adjuster
Blue
AdjusÈr
Face
Figure 32
Fisure
s3
1
5
Figure 34
Figure 35
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