Operation Manual

DR
580
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U
iei
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The
bobbin thread
tension
has
been
set
for
a
medium
grade 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
with
the
tip
of your
thumb
as
follows:
Turn
it
left
gEE(
—
for
looser
tension.
Turn
it
right
>)
—
for
tighter
tension.
Determine
whether
the
bobbin
thread
tension is
set
for
a
medium
grade
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.
Do
not
turn
the
knurled
screw
too
far
to
the
left
to
keep
it from
falling
out.
Choose
the
lower
tension
slightly
stronger
when
doing
ornamental
stitching
to
be
sure
you
y
always
have
a
neat
satin
stitch
on the
right
side
of
the
fabric.
The
final
stitch
appeara
nce
can
be
regulated
by
the
upper
tension dial,
as
follows:
Turn
left
—(E(
for
looser
tension.
Turn
right
)‘—
for
tighter
tension.
The
upper
tension
is so
designed
that
all
grades
of
tension
—
loose
to
tight
—
con
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
R
8029
19