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ADJUSTING
YOUR
SEWING MACHINE FOR GOOD STITCHES
When your sewing
machine does not
sew a
properly locked
stitch, check
the
following
:
1.
Insert a
new needle of
the correct size for
the
thread and fabric you are
ustng.
Consult chart on
page
5.
2.
The
upper
and bobbin
thread
should be matched
tn size
and
type
.
3.
Check
threading
care
rully
.
See
page
9.
4.
Check the
thread tension
balance.
Begin with a full
bobbin, properly threaded
into
the
case.
Set the stitch length at
about
12
stitches
per inch
.
Sew
a row
of
stitching diagonally across a
double
thickness
of
your fabric.
a.
If seam is
puckered
-
both
tensions are too tight
.
b.
If bottom thread
is
looped
-
tighten upper thread tension
.
c.
If top thread lays on top of
fabric
-
loosen upper thread
tension.
Grasp
both ends
of the diagonal row of
stitching.
Pull
evenly and
firmly until
one
or
both threads
break.
a.
If
both threads break
-
tensions are
balanced.
b.
If neither thread
breaks
-
both tensions
are too
loose.
c.
If upper thread
breaks
-
loosen upper
tension.
d
.
If
lower
thread breaks
-
tighten
upper
tension.
Bobbin tension
may
also
be reset by this
procedure.
Start
with a
loose bobbin thread
tension.
Tighten the
spring screw gradually
until
bobbin case and full
bobbin can be
gently lifted from your hand
by
the end
of the
bobbin
thread
.
32
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