IV.
MAINTENANCE
OF
THE
MACHINE
O As the knife of the machine cuts the cloth, much waste cloth will be produced, so clean the machine at least once a day.
Dust and thread hards are liable to be collected especially in the clearances
of
the
throat
plate, needle guard aMl feed dog, so remove the
throat
plate and clean it thoroughly at least once a week.
0 Inspect the machinehead at least oncea year and operate the machinein perfectly maintainedcondition.
V.
CAUSES
OF
MALFUNCTIONS
AND
CORRECTIVE
MEASURES
No.
Malfunctions
Reasons
Corrective
measures
1.
Needle
breaks
(1) Wrong needle
(2)
Wrong size
number
needle used
(3)
Needle installed wrong
(4)
Needle
is
curved
(5) Wrong
relation
with
needle
guard
(6) Wrong relation with needle &
looper
(1)
Use
only
the
designated
needle
(2)
Use
needle
which
fits
thickness
of
cloth
and
using
thread
(3) Refer to
chapter
on
"How
to install
the
needle"
(4)
Exchange
with
new
needle
(5)
Adjust
the
needle
guard
(6) Refer to the
chapter
on "Matching the
looper"
2.
Inadequate
cutting
of
knives
(1)
Inadequate
installation
of
upper
and
lower
knives
(2)
Knives
are
worn
out
(1) Refer to the
chapter
on
"Knife
and
overedging
width"
(2) Sharpen the lower knife and exchange the upper knife
3.
Stitches
skip
(1) Relation
of
needle
with
looper
(2) Knife
point
of
looper is blunted
(3) Needle
thread
is
right
twist
(4)
Inadequate
adjustment
of
thread
tension
(5) Inadequate adjustment
of
chain looper
thread
cam
(MO-816)
(1) Refer to
the
chapter
on "Matching the
looper"
(2)
Sharpen
with
oil
whetstone
or
exchange
it
with
new
looper
(3) Change it to left twist thread
(4) Refer to chapter on
"The
thread
tension"
(5) Refer to the chapter on "Adjusting the chain looper thread
cam"
4.
Thread
breaks
(1)
Inferior
quality
of
thread
(2)
Thread
is
thicker
than
needle
(3) Inadequate installation of needle
(4)
Thread
tension is
too
strong
(5)
Needle,
looper,
throat
plate,
needle
guard
bruised
(1) Use
good
quality
thread
(2) Change to
appropriate
needle or
thread
(3) Refer to the chapter on "How to install the needle"
(4) Adjust by
thread
tension
nut
(5) Sharpen by oU whetstone or
buffer
5.
Inadequate
chain-off
thread
of
double
chain
stitch
(MO-816)
(1) Inadequate installation of presser
foot
(2)
Rattle
of
rear
presser
foot
(3) Inadequate timing
of
looper thread cam
(4) Inadequate installation
of
double chain
looper
(1) Refer to
chapter
on "Presser
foot
and
feed
dog"
(2)
Adjust
to
eliminate
rattle
(3) Refer to chapter on "Adjusting the looper thread
cam"
(4) Refer to chapter on "Matching the double chain
looper"
6.
Wrinkled
stitches
(1)
Needle is
too
thick
(2)
Thread
tension
too
strong
(3)
Pressing pressure is
either
too
stong
or
too
weak
(4)
Feed
dog
protruded
too
much
(5)
Knife
does
not
cut
well
(6)
Differential
feed
is
not
matched
(1) Use needle
appropriate
to
cloth
and
thread
(2)
Adjust
by
thread
tension
nut
(3) Adjust the pressure by turning the adjusting screw either to
right
or
left
(4) Lower the feed dog and match the height of the main feed
dog with the height
of
sub feed
(5) Resharpen
the
knife
(6) Refer to chapter on "Adjusting the differential feed"
7.
Uneven
stitches
(1)
Flaw
in
the
thread
tension
(2) Inadequate thread tightening
(3) Needle
point
is
blunted
(4)
Inadequate
pressing pressure
(5) Inadequate height of feed dog
(1) Use uniform size
thread.
Clean up
the
thread
path
(2) Strengthen the thread tension
(3) Exchange the needle with a sharp pointed needle
(4) Refer to chapter on "Presser foot and feed dog"
(5) Refer to chapter on "Presser
foot
and
feed
dog"
SPECIFICATIONS(Applicable
to
all models)
Stitch length:
Differential
feed
ratio:
Lower
knife
pressure:
Overedge
width:
Presser lifting
amount:
Needles:
Needle
bar
stroke:
Upper looper:
Double
chain
stitch
mechanism:
Presser
foot:
Lubrication:
0.3-4.0mm(l/64"-9/64")
(Push-button system)(By special specification, up to 5mm(13/64") possibly
Ratio
of
auxiliary feed to main feed: Gathering:
1:2
(Max.
1:4)
Stretching: 1:0.7 (Max.
1:0.6)
Spring pressure adjusting system
Standard
3.2
mm(l/8")
Byusing
gauge
sets (throat plate, presserfoot, feed dog,needleclamp)whichconform to the
overedging
width, possibleto
adjust up to 6.35
mm(l/4")
Max.
7.0
mm(9/32")
DCx27
(Standard),
DCxJ27
(For
fine
synthetic
thread)
DCxl
24.2
mm(61/64'*)
Slide type (Possible to change the up and down stroke
of
looper depending on thickness of the sewing cloth)
Built-in inside the machine and geared with the lower looper (MO-816)
Fixed
presser
foot
MO-804, MO-814
Two-stage presser
foot...
MO-816
Automatic lubrication system by means
of
gear pump (equipped with oil cooling fan)
-13-
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