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Irregular
stitching
2.
The
needle
is
not
threaded
correctly
or
the
bobbin
is
not
wound
properly.
3.
The
weight
of
the
material
and
the
size
of
the
thread
are
not
in
accord.
4.
The
needle
thread
is
not
inserted
between
the
tension
discs
correctly.
Thread
the
needle
or
wind
the
bobbin
correctly.
Consult
the
Needle and
Thread
Chart
on
page
23
to
select
the
correct
thread
size.
Raise
the
sewing
foot
and
insert
the
needle
thread
between
the
tension
discs.
Cause:
1.
The
needle
and bobbin
threads
are
of
inferior
quality.
2.
The
bobbin
is
wound
unevenly.
Remedy:
Use
high-quality
threads
only.
Rewind
the
bobbin,
as
instructed.
The
machine
works
heavily
and
is
noisy
Cause:
1.
The
machine
lacks
oil.
2.
Dust
and.
pieces
of
thread
have
accumulated
in
the
shuttle
race.
3.
The
machine
is
clogged
by
inferior
oil.
Remedy:
Oil
the
machine,
as
instructed.
Clean
the
shuttle
race
and
the
shuttle,
as
instructed.
Clean
and
oil
the
machine
thoroughly,
using
a
high-quality
sewing
machine
Puckered
seams
Cause:
1.
The
thread
tension
is
too
tight.
2.
The
machine
feed
is
set
too
high.
Remedy:
Adjust
both
tensions,
as
instructed.
Lower
the
machine
feed,
as
instructed
on
page
15.
4.
The
belt
tension
is
too
tight.
oil.
Adjust
the
motor
bracket
to
reduce
the
belt
tension.
30
31
17


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