Newlong DS-9C - Machine Adjustments: Tension and Presser Foot; Thread Tension Adjustment Guide; Presser Foot Pressure Adjustment

5. Adjusting/Elf
H
The
looper
movernent
of
this
rnaqh.i&e
tr-as
hee(r
qrcge(L\
adjusted
before
shiprnent
from the
factory,
but
if it
needs
re-adjustment
when
it is disassembled
for repair
or
etc,
prcceed
as
foilows.
1. Thread
Tension
(figure
3)
Thread tension
is
most important
for successful
sewing,
Maiadjustment
results
in thread
break,
skipping
stitches
and
break
ofbag.
Proper
thread
tension
may slightly
vary
with the
type
of bag
and thread.
The
norm
is
given
below.
Thread
tension
regulators
are mounted
so
that the
tension
is uniform
for
stitch length.
To
adjust the
tightness
of seam,
adjust
O,@
in
Figure
3:*
1) Heavy
material
fiute,etc.)
Thread tension
regulators
O
should
be loosened slightly
(turn
the
adjust
nut counterclockwise),
Needle thread
controller
@
after
loosening
set screw.
2)
Lisht material
Tighten
thread
tension
regulators
O
(turn
the adjust
nut
clockwise).
3) Needle
thread
At
the shipment,
the
needle
thread
controller
@
for
Creped
Paper
Tape is
adjusted
a iittle
downward.
In case
of using
sewing
machine
without
Creped
paper
Tape, the
needle
thread
controller
@
should
be re-adjusted
upward.
The feed
rate
of
thread
must
be adjusted
according
to
stitch
leneth
and
thickness
of bag.
If thread
tension
regulator
adjustment
is
not
sufficient
for
obtaining
the
required
thread
tightness,
use
needle
thread
controller
@
by moving
it
up
or down
as
necessary,
after
loosening
set
screw.
Thread
is tighter
by
moving
it up
(in
the direction
of the
arrow),
and
is looser
by
moving
it
down.
Tighten the
set
screw
after
adjustment.
4)
Looper
thread
Looper
thread
tension
regulator
@
should
be
adjusted
in
accordance
with
adjustment
of
the
needle
thread
tension
=
regulator.
Adjust
it
so that
the
looper
thread
will
not
sag.lf
looper
thread
tension
is too
much,
the
needle
thread
may
break.
2- Presser
Foot
Pressure
Presser
foot
pressure
must
be
adjusted
according
to
the
material
of bag
and
thickness.
Check the
reverse
side
o{
searns.
The
pressure
is too
strong
if seams
show
a sign
of
scratches
by
feed
dog teeth,
or the
actual
stitch
length
is
shorter
than
the
preset
feed
rate
of
feed
dog
teeth.
In
this
case,
unscrew
plate
spring
adjust
screw(102171),Figure
4,
after
loosening
nut
(5/16N24301).
Be sure
to tighten
the
nut
after
the
adjustment.
If the
pressure
is
too weak,
seams
do
not
form
a straight
line,
or
the
stiteh
length
is irregular.
In
this
case,
increase
the
pressure
by screwing
the
plate
spring
adjust
screw.
Decrease
the
pressure
when
closing
jute
and
other
heavy
bag
material,
and increase
it when
closing
pp
woven
cloth
and
other
light
bag
material.
your
machine
is
adjusted
for
3-ply
kraft
paper
bags
at the
factory.
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