16.
THREAD
TENSION
*
Adjusting
the
thread
tension
for
puri
stitch:
1. Adjust
the
bobbin
thread tension to
approx.
15 to
20g
by
adjusting screw 0
of
the
bobbin
case.
2. Adjust tension controller No. 1 0 for proper needle thread
tension
so
that
the
bar-tack
part
is
formed
by
well-shaped
whip
stitches.
If
the
tension
is
too
low,
bar
tacking
seam
may
form
thread
knots
on
the
rear
face
of
fabric.
3. Adjust tension controller No. 2 0 for proper tension
of
the
pallarel
side
seams
by
judging
from
the
stitch
formation.
*
Adjusting
the
thread
tension
for
whip
Stitch:
1.
Adjust
the
bobbin
thread
tension
to
approx.
40
to
50g
by
adjusting
screw O
of
the
bobbin
case.
2. Exchange
the
adjusting springs of tension controllers No. 1 0
and
No. 2 0
each
other
(the
tension
controller
No. 2 will
have
a
weak
spring).
3. Adjust tension controller No. 2 0 to prevent ravelling
off
at the
end
of
a
seam.
4.
The
stitches
of
the
parallel sides
or
bar-tack
can
be
adjusted
by
tension
controller
No. 1 0
17.
ADJUSTING
THE
OVEREDGING
LENGTH(BUTTONHOLE
LEI^GJH)
1. Pull
out
cover
0,
and raise cover 0 .
2. Loosen
nut
0 by
the
spanner supplied
with
the
machine. Set
point o to a desired length on scale 0
(this
length is
the
same
with
the
knife
width),
and
then
retighten
nut
0.
3.
Through
your
trial
sewing,
adjust
the
overedging
length
accu
rately
to
the
extent
that
the
bar
tacking
seams
are
not
cut
by
the
knife.
* Changing
the
work
clamp
check
Use
work
clamp
check
0 having
the
size
nearly
the
same as
that
of
a
buttonhole
length.
By removing setscrew
0,
a
work
clamp
checks
can
be
changed
together
with
a
work
clamp
check
holder
as a set.
Work
clamp
check/Work
clamp
check
holder
set
Part
No.
B1552-78I-OAO
B1552-782-0A0
BI552-7834)A0
Applicable
knife
width
l/4"~3/4"
l/4"~l-l/4"
-5-
* Adjusting
the
thread
take-up
spring (for
purl
stitch)
The
suitable range of
the
stroke
of
thread
take-up
spring 0 is
from
6 to 8mm
with
a starting tension
of
20
to
50g.
For
adjusting
the
stroke
of
the
thread
take-up
spring, loose screw
0,
and
insert
a
thin
screwdriver
into
the
slit
of
tension
post
0
to
turn
the
tension
post.
To
adjust
the
tension
of
the
thread
take-up
spring,
insert
a
thin
screwdriver
into
the
slit
of
tension
post
0 to
turn
it, with screw 0 tightened. The tension
of
the
thread
take-up
spring increases
when
the
tension
post
is
turned
clockwise,
and
decreases
when
turned
counterclockwise.
18.
REPLACING
THE
KNIFE
When
sharpening
or
replacing
the
knife,
remove
it as
follows:
1. Loosen setscrew
0,
and remove knife 0 to
gether
with
the
washer.
2.
Attach
the
knife
to
the
knife
holder
so
that
the
higher
end
of
the
slanted
knife
blade
comes
down
2
to
3mm
above
the
surface
of
the
throat
plate
when
the
knife
if
brought
down
to
the
lowest
position.
(NOTE): Do
not
forget
to
install
the
washer when
retightening
the
setscrew.
From the library of: Superior Sewing Machine & Supply LLC
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