Operation Manual

Regulating
the
Thread
Tension
DR
580
The
bobbin
thread
tension
has
been
set
for a
medium
grade
at
the factory
and
need
not be
adjusted
for
all
ordinary
sewing
operations.
If
a
special
sewing
operation
should
require
a
looser
or
tighter
tension,
turn
the
small
knurled
screw
on
the
bobbin
case
as
follows:
Turn it
left
W\
for looser
tension.
4
Turn
it
right
for tighter
tension.
The
thread
tension
screw
can
be
turned
with
the
thumb
tip.
Determine
whether
the
bobbin
thread
tension
is
set
for
a
medium
grade
J
by
holding
the
thread
end
between
thumb
and
forefinger
and
letting
the
bobbin
case
hang
freely.
The
tension
should
be
strong
enough
to
keep
the
bobbin
case
from
being
pulled
down
by
its
own
weight.
However,
as
you
jerk
your
hand
slightly,
the
bobbin
case
should
gradually
slide
down.
Iv
The
final
stitch
appearance
can
be
regulated
by
the
[
4J
upper
tension
knob,
as
follows:
Turn
left
‘‘
for
looser
tension.
Turn
right
f4
for
tighter
tension.
The
upper
tension
is
so
designed
that
all
grades
of
tension
—
loose
to
tight
—
can
be
covered
with
one
complete
turn
of
the
tension
dial.
The
numbers
on
the
tension
dial
indicate
different
degrees
of
tension.
The
higher
the
number,
the
greater
the
tension.
Only
in
very
rare
cases
will
it
be
necessary
to
reset
the
tension.
For
ordinary
sewing,
the
upper
tension
should
be
set
between
3
and 5.
Your
upper
tension
has
a
third
tension
disc
for
two-
needle
work.
A
R8029
17