Juki SC-20, SC-120, SC-220, SC-320 User Manual

aJUKI
SC-20
SC-220
SC-120
SC-320
ENGINEER'S
MANUAL
SC-20
SC-320
No.
1990.7
PREFACE
The engineer's manual is written for the technical personnelwho are responsible for the service and maintenance of the
sewing machines. This manual presents detailed explanationofthe adjusting procedures, etc. which are not covered by
the INSTRUCTION It is advisable to use this engineer's manual is combination with the pertinent INSTRUCTION
MANUAL
intended for the maintenance personnel and operators at a garment factory.
MANUAL
and PARTS
LIST when servicing the sewing machinesofthese models.
1. Keep hands away from (he needle when the power switch is turned ON or while the machine it
operating.
OPERATION
Z Oo
not
put
while
(he
machineisoperating.
4.
During
operation,becareful
Other person's head or hands to come close to the
handwheel,Vbell,
not place anything close to them. Doing so may be
dangerous.
your
(irsgers
bobbin
PRECAUTIONS
into
the
thread
not to allow
winderormotor.
i 1_
take-up
your
cover
or any
Also, do
3. Be sure to
the
machine
S. If
your
guardorany
machine
turn
the
power
headorremoving
machineisprovided
other
with
protectors,donot
anyofthem
switch OFF
the V
with
removed.
belt
a belt
before
cover,
operate
tilling
finger
your
6. To achieve earth
sewing
security,besure
wire has
machine.
been
connected
that
the
before
power
ope'ating
supply
7. No
motor
the
not
operating.
OFFatthe
soundisheard
endofwork.
So. do
when
not
forgettoturn
the
sewing
machine
the
power
is
i
•'*
*•'
CONTENTS
1.
GENERAL
1-1.
Features • • • . 1
•••••;
•• ^
2. OPERATION 3
2-1.
Name
ofpart 3
2-2. Test run ^
2-3.
SC-20
Powerindicatorbox ^
2-4.
2-5.
SC-120
SC-220
Control
Control
panel
panel
2-6. SC-320 Control panel 12
3.
ADJUSTMENT
3-1.
Belt
tension
21
21
3-2. Prevention motor vibration (for Ncompany'smotor) 21
3-3. Checkingand correcting the rotational direction of sewingmachine 21
3-4.
Pedal
3-5. Maximum sewing speed 25
3-6.
Auto-lifter
3-7. Howto
reduce
the handlightfrom
flickering
(for
single
phaseonly) 28
22
27
^
®
4.
FUNCTIONS
4-1. Power supply voltage 29
4-2.
Functions
selection
switches
4-3. Increaseofcontrol panel functions 44
44.
Safety circuit 46
4-5. Connectors for standing work 48
4-6. Production control systemand needle-upstop switch functions 50
5.
MAINTENANCE
AND
INSPECTION
5-1. How to replacethe sensorpotentiometer set 51
5-2.
Memory
5-3.
Motor
54.
Solenoid
5-5. Howtoreplace each circuit board 55
5-6. Troubleshooting 64
5-7. Circuit board installment diagrams 75 5-8. Connector connection diagrams 80
battery
malfunction
monitor
charging
detector
LED
monitor LED
LED
(SC-320
only) 53
5-9. Typeofrating plates for SC seriesofthe PSC unit 81
5-10. Block diagrams 82
29
30
51
53
54
1.
GENERAL
1-1.
Features
1)
Use
ofanACservomotor
(1) No noise or vibration while the machine is at rest.
(2)
The
power
consumptionis40%to60%
(3)
The
motor
weight
(4)
The
absence
(H
company's
Unlike the DC servomotor, there is no bmsh.
2) Pedal operation features
(1) Youcansetthe
stepswith fingertipcontrol according to the type of
operation and your levelofproficiency.
(In the conventional unit, themotor pulleyhad to
be changed to alter the maximum
Further, you canget the samespeedat any time.
ofa
provides
has
been
clutch
(no
brakeisgood
maximum
the
following
almost
halved,
brakeincase
for
more
sewing
speed
sewing
mqor
compared
permitting
ofN
than10
in400
speed.)
advantages:
with
easier
company's
years
under
s.p.m.
the
conventional
layout
motor)
normal
power
change.
makes
theunit
operation.)
consumption.
virtually
maintenance-fiee.
High-speed'
play
stroke
(2) The
(3) The
(4) The minimumspeedfor depressing the front part of
3)
Reverse
(1)Asin
(2)
(3)
conventional
So, by combining the knob with the function
mentioned in(1)
be provided. This eliminatesthe need for large pedalingforce to maintain high speed,significantly
reducing operator foot fatigue.
speed
about 1mm (0.039") by pedal stroke to suit with
each operator.
the pedal can be changed (from 200 s.p.m.to 400
s.p.m.).
feedstitchingfeatures
the
conventional
starting
a preset speed.
The
Furthermore, the
The
stitching speed is changed.
reverse
reverse
speed
speed
above,
acceleration
feed
feed
stitching
speed
control
circuitry
limit
high-speed
starting
model,
stitching
speed
canbe
knobis
pointcanbe
you
orthe
has
adjusted
has
been
also
provided.
playstrokecan
can
select
modeinwhich
been
increased
from
improvedtoprevent
adjusted
either
1,000
the
modeinwhich
the
machine
from
1,700
s.p.m.
to 3,500
overrunor1-stitch
Pedal
(3)
1mm
adjustable
pedal
Pedal
priorityisgiventopedaling
performs
nonstop
s.p.m.to1,900
s.p.m.,
using
depression
(0.039
by
stroke
depression
s.p.m.
the
error
when
amount
'l
^
>
/
/ (4) 400 spm
_t
200
amount
reverse
feed
(about
variable
the
reverse
spm
for
stitching
12%
increase).
resistor.
the
at
feed
4) The softstart speedhasbeen
The
soft
start
speed
for
to 800 s.p.m.
The
soft
start
speedisnow
the speedmore than necessary.
increased.
assuring
adjustable
properly
interlaced
withinarangeof200
threads
- 1 -
ofa
starting
stitch
s.p.m.to2,000
has
been
s.p.m.,soyoudonot
increased
from
200
s.p.m.
havetodrop
5)
Enhanced
Thecontroller
simplybyreplacing
6) A manualcount-downcapabilityhas been added.
Asanadditional
switchtoprovide
series
comes
with
easy
inthe
their
capability,
the
control
upgrading
SC-20,
control
the
based
panels
manual
SC-120,
(excluding
count-down
ofa
preset
SC-220,
numberofstitches.
SC-320
the
SC-522).
capability
and
SC-522
has
been
series,
andyoucan
addedtothe
easily
one-touch
• '•^ ^ ^
upgrade
?; > ..
type
reverse
them
feed
When the one-touch type reverse feed switch
Count
back
Count
back+Thread
7)
Even
ifa
material
(After
thread
highestposition.)
8) Aconnectorfor standing workhasbeen
9) A
10)
terminal
The
circuit
for connection to a
automatic
board.
trim
overlapatsewing
trimming,
presser
ispressed,the preset number of stitches is
counted
When the one-touch type reverse feed switch
ispressed,the preset numberofstitches is
counted
startorendis
youcanturnthe
sewing
foot
lifting
capability
down.
down,
handwheel
provided
control
Description
and
threads
thick,
inthe
asa standarditem.
system
canbeadded
are
trimmed.
the
needle
reverse
hasbeen
provided.
simplybyadding
Sewing pleats
Replaces the reverse feed
stitching at a seam end. (This feature is especially useful
in a sewing machine for standing
work
because
operating
switchiseliminated.)
will
notbe
caught
directiontobring
theAKauto-lifter
Applications
the
need
the
thread trimmer
inthe
the
needle
for
thick
overlap.
barup to its
andatransistor
11)
The
control
12)Toensure
13)
You
(Forasewing
14)
The
output
should occur, the minimum function isassured.
(Example
reversefeed stitching.)
15)
The
input
16) Reliability
The
17)Weare
Sewing
panelisvery
easier
operationofthe
can
setthe
lifting
machine
transistor
: If
the
trouble
machine
checking
system.
This
uses
planningtoprovide
controlcounter(oflowcost)
easytooperate
duration
for
has
thread
trimmer
feature
enables
only
the
standing
been
youtoquickly
components
the
control
ofthe
work,itis
designedtobeaunit
transistor
for
the
following
and
panel,
Auto-lifter
fails,
output
and
which
options
the
slant
panel
each
key
after
thread
advisabletoset
circuit
the
wiper
system
(output
easily
identify
have
passed
inthe
future:
surface
has
makesiteasiertosee
been
assignedtoonly
trimming
the
lifting
boardtomake
transistor
monitor
defective
our
reliability
for60
sec.
duration
ita
common
will
worktopermit
LED)
has
parts.
test
conductedoneach
one
or ten
for
been
addedtothe
indicationonthe
function.
minutes.
ten
minutes.)
part.Ifany
thread
panel.
trouble
trimming
and
conventional
discrete
component.
18)
The
machine
controller
now
canbeappliedtothe
controlofthe
- 2 -
ED-1
(cloth
edge
sensor)
(Optional).
2.
OPERATION
2-1. Nameofpart
O Power switch
o Control
box
0 Synchronizer O
L-shaped
0
PSCbox
0 Max.speedcontrol knob
0 Motor
threadstand
m
0 Pedal
0 One-touch type
0
Wiper
0 Stand
0 400 s.p.m.-step speed control knob
0 Connector for standing operation
0 Connector for production control system
levelling
reverse
feedswitch
screw(or caster)
- 3
O Power switch
Power switch for
the
motor,
PSC and
control
box.
0 Control
Usedtomake
sewing conditions.
® Synchronizer
box
settings
Incorporatedinthe
speed,
then
sendsaresultant
L-shaped
O
0 PSC box
thread
stand
Comprisesacircuitrytocontrol
trimming
actuate
0
Max. Allows
0 Motor
Operates
(AnH
solenoid,
the
elements.
speed
controlknob
analog
the
company's
adjustment
machineathigh
for
machine
reverse
motoris
automatic
pulley,
input
the
feed
solenoid,
of the
maximum
speed
provided
reverse
the
synchronizer
signal
to the
sewing
etc.),apedal
medium
witha
feed
stitching,
main
machine
sewing
speed
speed
brake.)
the
number
detects
circuit
and
the
board
motor,anoutput
sensortodetect
without
low
speedinresponse
ofstitches for pattern
needle
position
inthe
PSC
box.
circuitrytooperate
pedal
position,
changing
themotor
toa
(upordown)
. .
andapower
pulley.
signal
received
sewing
and
the
from
orother
the
se^ymg
elements
circuitry
the
PSC
(thread
to
box.
0 Pedal
The
front
and
back
parts
ofthe
pedal
are
depressedtocontrol
presser
©
One-touch
#
0 Stand
0 400 s.p.m.-step speedcontrol knob
This
0 Connector for standing operation
0 Connectorfor production control system
footlifter
Usedby hand to perform
Wiper
Wipes
the
needle
PSC
box.
levelling
Usedtoperform
switch
Used
fora
Usedto connect the machineto aproduction control system.
(only
type
reverse
thread
screw
adjustment
has16steps
sewing
machine
fora
version
feed
switch
reverse
off
the
(or caster)
sothatthe
from
1to 16in
designed
with
AK-31,
feed stitching.
material
after
stand
ordertodigitally
for standing operation.
AK-34),
thread
rests
etc.
trimminginresponse
flatly
onthe
setthe
the
sewing
speed
toa
floortominimize
maximum
speed
andtoactuate
wiper
signal
vibration
in400
s.p.m.
the
thread
received
during
steps.
trimmer,
from
the
operation.
- 4 -
2-2.
Test
Run
1) Operation when the power switchisturned ON
When
the
power
switchisturned
needle reaches If
the needle is already in its upper stop position when the power switch is turned ON, the sewingmachine stays
stationary.
the
upper stop position, and then stops with its needle in that position.
ON,
if the
2)Pedal operation
(1) The pedalis operatesin the
©
foUowing
High
Low
Stop
Thread
needle
isnot inits upperstop
four steps, (except for a
speed
speed
trimming
Version
position,
with
AK-31,
the
machine
AK-34)
High
Low
Stop
rotates
speed
speed
(neutral)
^
untilits €?
'-Uf
Thread
The
sewing
machineruns at low speedwhen you depress the front part of the pedal.
The
sewing
speed
changes
(However,if the automatic
until it completes When
the pedalisreturnedto the neutral position(stop position),the
When
the backpart of the pedalis depressed, the thread trimmeris actuated and the needlegoesup and
stops in its upper position.
(When
the wiperswitchhas beenset to ON,the wiperis actuated.)
reverse
fromlow to highwhenthe front part of the pedal isfurther
reverse
feed stitching switch has been set, the machine will not mn at high speed
feedstitching.)
machine
will
depressed.
stop with
trimming
needle
down.
7^
- 5 -
(2) In caseof a versionwith AK-31,AK-34
The pedal isoperated in the
following
High
Low
Stop
Presser
Thread
speed
speed
trimming
fivesteps:
foot
lifting
@
High
Low
Stop
Presser
speed
speed
(neutral)
foot
lifting
2-3.
Thread
o The
sewing
o The
(However,
highuntil
o
When
o
When
o
When
machine
sewing
speed
if the
reverse
the pedalis returned to the neutral(stop) position,the
the back part of the
the backpart of the pedalisfurther depressed, the presser foot comesdown,thread trimmeris
startsat low
changes
automatic
speed
whenthe front part of the pedalislightly
from
lowto highwhenthe front part of the pedalisfurther
reverse
feed
stitching
feed stitching iscompleted.)
pedal
islightly
switch
depressed,
the
has
been
presser
set,the
machine
foot
depressed,
depressed.
sewing
speed
will
stopswith its needledown,
will
goup.
actuated, and the machine stops with its needleup.
(If the wiper switchhas beenset to ON, the wiperis actuated.)
o
Between
the low and high
sewing
speedpositions, the
machine
runsat a speedcorresponding to the pedal
depressionamount. (The speed isinfinitely variable.)
o The proper thread trimmingaction will not be disturbed even if the pedal is returned to the neutral
position immediatelyafter the machinestarts thread trimming.
At this time, the thread trimmerproperlyoperates
the safetycircuitryisput in operationso that the
even
if the front part of the pedalisdepressed,
machine
will
not mn afterthread
trimming
Therefore, the pedal must be returned to the neutral position once.
SC-20
Power
Indicator
Box
trimming
not
change
however,
iscompleted.
to
1) Power indicator LED o Lights up when the power switch is turned ON.
o Thislight stays ON for a while after the power isturned OFF. It is dangerousto carry out maintenance or
adjustment with the PSC box cover open. Be sure that the LED is OFF before starting maintenance such as
part replacement.
SC-
- 6 -
2 0
2-4. SC 120 Control panel
1) Controlpanel
Automatic
reverse stitching (for end) indicator
lamp (LED)
• Lights
switchisON.
when
the
ending
Power indicator lamp (LED)
Lights
up when the power switchis turned ON.
Stays
ON
forawhile
power
switchisturned
It is
dangeroustoperform
work
with
the
PSC
box
Be
sure
that
the
lampisOFF
forming
replacement.
maintenance
reverse
immediately
OFF.
any
cover
open.
work
such
stitching
after
the
maintenance
before
per
as
parts
m m
Automatic
reverse stitching (for start) indicator
lamp (LED)
• Lights
switchisON.
Switches
These
numbersofstitches
The
Automatic
Used
stitchingatsewing
Each
turns
invalid
has
when
for
setting
are
pushbutton
setting
[+]...
.Increases
B . . . .Decreases
reverse stitching (for start) switch
to
turn
time
ONorOFF.
when
been
setto"0".)
the
starting
the
numberofstitches
reverse
switches for
for
rangeisfrom0to
ON
this
switchispressed,italternately
the
stepsAand
9.
the
numberofstitches
the
numberofstitches
or
OFF
start.
numberofstitches
automatic
(This
switchisrendered
stitching
setting
B.
reverse
for
step
the
B
Switch
for
raising
the
needle.
•Ifthis
• By depressing
stops
and
thread
(Note
needle
stopsinits
switchisturned
with
its
needle
upper
the
trimmer
that
has
maybeactuated.
this
switch
been
moved
down,
position.
back
2) Howto use the automatic
Automatic
switching
switchO
Stitching
Automatic
stitching
switch 0
reverse
(for
pattern
reverse
(for
start)
end)
OFF
OFF
ON
when
the
the
needle
partofthe
willbeinvalid
downbyhand.)
reverse
ON
OFF
machine
goes
up
pedal,
the
when
the
stitchingpatterns
OFF
N
ON
ON
N
ON
Automatic
Used
stitchingatsewing
Each
turns
invalid
has
By combining ON and
stitching (for start) switch O and automatic
reverse stitching (for end) switch
to
turn
ON
or
OFF
automatic
end.
time
this
ONorOFF.
when
been
switchispressed,italternately
(This
switchisrendered
the
setto"0".)
OFF
numberofstitches
conditions of automatic reverse
reverse
reverse
for
step
stitching
B
m
El
m
(for end) switch O , four different stitching patterns are
available.
- 7 -
2-5.
SC-220
1) Control panel
Control
panel
Automatic reverse stitching (for end) indicator
lamp (LED)
• Lights when
• When pattern 4 has been selected, this lamp does not
the
ending reverse stitching switch is ON.
light. ^
Automatic
reverse stitching (for start) indicator
lamp (LED)
• Lights when
• When
light.
the
pattern
starting reverse stitching switch is ON.
4 has been selected, this lamp does not
Power indicator lamp (LED)
• Lights when
• Stays ON for a while immediately
switchisturned
It is dangeroustoperform any maintenance work with
the
PSC
Be sure
maintenance
box
that
the
cover
work
power
OFF.
the
switch is
open.
lamp is
suchasparts
turned
ON.
after
OFF
before performing
replacement.
the
power
Automatic thread trimming indicator lamp (LED)
• Lights
• Ughts whenever pattern 4 has been selected.
• When
ON.
light.
when
the
automatic
pattern
1 has been selected, this lamp does
thread
trimming
switch
Pattern indicator lamps (LEDs)
been
• When a
corresponding
Switches
pattern
for
lamp
setting
(1 to 4) has
lights.
the
numberofstitches
• These are pushbutton switches for setting
of
stitches for steps A to D. The setting range is from 0
to
9.
(When pattern 2 or 3 has been selected, the number
stitches
canbeset
^
0
for0to99forCandDtogether.)
Increases
Decreases
the numberof stitches
the
number
selected,
of stitches
the
numbers
is
not
the
of
Automatic reverse stitching (for start) switch
UsedtoturnONor sewing
start.
• Each time this switch is pressed, it alternately
or OFF. (This switch is valid for patterns 1, 2
For patterns 1 and 2, the switch is invalid for step B. For pattern 3, it is invalid when the rotary switch
"SW1.
SNUMA—D"
"0".)
Automatic
UsedtoturnONor
sewing
• Each
or The
in
"SWI.
"0")
reverse stitching (for end) switch
end.
time
this
OFF.
(This switch is valid for
switch is invalid for step C in
pattern
2. It is also invalid when
SNUMA~D"
OFF
automatic
in
the
OFF
automatic
switch is pressed, it alternately
in
the
PSC
PSC
reverse
box
reverse
patterns
pattern
the
box
has
1 and step B
rotary switch
has
stitching
turns
and
been
stitching
turns
1, 2 and 3.
been
set
set
ON
ON
B B B B
m
AB
AS
ICPj
Pattern
• Used to select
at
3.
to
at
Switch
• If
• By depressing the back partofthe pedal, the thread
Automatic
to
• For patterns 2 and 3, this switch turns ON or
selector
panel.
for
this
switchisturnedONwhen
its
needle
upper
positions.
trimmer
(Note
that
has
been
This
is a
automatically
switches
oneofthe
raising
the
down,
the
maybeactuated.
this
switch
moved
downbyhand.)
thread
trimming
selector
trim
threads
sewing step even with
depressed.
alternately
each
time
four
needle
needle
goes up
will be invalid
switch
switch
to
upon
the
front part
it is pressed.
patterns
displayedonthe
the
machine
and
when
cause
the
completionofthe
of
stops
stops
the
machine
the pedal
with
in its
needle
to
last
OFF
• For pattern 4, the indicator is always ON regardless of
the switch
ON/OFF
condition.
- 8 -
2)
How
to use
each
stitching pattern
fim
H.
:>
i>
i»1
f
%
I."
AB AB
IcdI
A/Ci
B
ID
CO
A. -B • C D
• Q Q E)
HS
(B
ii
(9 (9
GO
1. Pattern $>
Automatic
stitching
switch 0
Stitching
Automatic
stitch
switch
(for
0
reverse
(for
pattern
reverse
end)
start)
OFF
OFF
0 0
ON
OFF
>ۥ
OFF
n
ON
ON
ON
•JUKI
e e
1. Turn pattern selector O ON.
2. By combining ON and OFF settings of automatic
reverse
stitching (for start) switch 0 and automatic reverse
stitching (for end)
patterns
are available.
3. For the starting automatic
switch
0 , four different stitching
reverse
stitching, set the
numberofstitches using A and Bofswitch O . For the
ending automatic
reverse
stitching, set the number of
stitches using C and Dofswitch O .
(Precaution) Be sure that, when you selecta pattern selector
switch,
lamp
lights
the
corresponding
up.
pattern
Indicator
2. Pattern :|>
Automatic
stitching
switch 0
Stitching
Automatic
stitch
switch
(for
0
reverse
(for
pattern
reverse
end)
start)
OFF
OFF
CD
ON
OFF
CD
OFF
ON
ON
ON
1. Turn pattern selector switch 0 ON.
2. By combining ON and
conditions
of
automatic
OFF
reverse stitching (for start) switch 0 and automatic
reverse stitching (for end) switch 0 , four different stitching patterns are available.
3. For bofo starting and
ending
automatic
reverse
stitchings,
set the numbersofstitches using A and B of switch O .
4. The
numbers
of stitches for theintermediate stepscanbe
set within the range of 0 to 99, using C and D of switch
O .
5. When automatic thread trimming switch 0 has been
tumed ON, the thread trimmer
will
automatically be
actuated upon completion of steps CandD or the ending
reverse stitching.
6.
When
automatic thread trimming switch 0 has been
tumedOFF, the
machine
stopswithits
needle
down
upon
completion of steps C andD. At thistime,if you operate
the one-touch type reverse feed switch, the machine mns
at low
speed
(for
compensative
return the pedal to itsneutral positionbefore you
the front part of the
operation regardlessofthe preset numberofstitches.
pedal
stitching). Further, if you
again,
you can
resume
depress
sewing
- 9 -
3. Pattern :|>
Automatic
(for start) switch ©
Automatic
(for end) switch 0
Stitching
reverse
pattern
reverse
stitching
stitch
AB
OFF
*
CD
AB
CD
OFF
1. Turn pattern selector switch © ON.
2. By combining ON and OFF conditions of automatic
reverse
reverse
stitching (for start) switch © and automatic stitching (for end) switch 0 , four different
stitching patterns are available.
3. Set the numbersofstitches for steps AB and CD within
the
range
of 0 to 99, usingA to D of switch 0 .
4. Set numbersofstitches N for the starting and ending
automatic reverse stitching steps. (See the setting method
described below.)
5. Upon completion of each step, the machine stops with its needle down even when you depress the front part of the pedal. .At this time, if you operate the one-touch type reverse feed switch, the machine will perform
compensative stitching.
6. If you depress the back part of tlie pedal during
intermediate AB or CD steps, the machine will immediately trim the threads. If you depress the back
part of the pedal during the last CD step, the machine will
trim the threads either immediately or upon completion
of the ending automatic reversestitching.
ly
I/n
ON
OFF
Yn
CD
AB
AB
CD
OFF
AB^
7. When automatic thread trimming switch 0 has been
turned ON, if you depress the front partofthe pedal after
completion of the last step, the machine will
threads either immediately or upon completion
ending automatic reverse stitching.
8.
When
automatic thread trimming switch © has been
turned OFF, the machine will stop with its needle down upon completion stops, the pedal is in its neutral position. If you depress the front part operation. At this time, if you return the pedal to its
neutral position before you depress the back part of the
pedal, the machine will trim the threads either immediately or upon completion
(Note) For a machine equipped with an Auto-lifter, the
Auto-lifterisactuated
its
needle
the
machine
compensative
CD
l/N
AB
CD
ON
of
the last step. When the machine
of
the pedal, you can continue sewing
when
down
upon
completionofa
stops
stitching
with
operation.
AB
of
reverse stitching.
the
machine
its
needle
ON
CD
AB
CD
ON
trim
of
stops
steporwhen
down
the
the
with
in
4.
How
to set numberof stitches Nfor startingand
SNUMA~D
TP6
S.GND
BT
SUB
•nCZl'^
JMAX
PNEUF
M400I
Pattern
301
ending
automatic
reverse
stitching steps
1. Turn the power switch OFF.
2. Open the PSC box cover.
3.
Using
a flat-bit screwdriver, set the arrow on rotary switch
(SWl) O on the main circuit boardtothe desired
numberofstitches.
4.
Close
the
PSC
box
5. Turn the power switch ON
cover.
again.
This completes the
settingofnumberofstitches N.
(Note) Both starting and ending automatic
steps
will
have
the
same
numberofstitches.
1.
Turn
pattern selector switch O ON.
(At this
time,
the
automatic
thread
reverse
trimming
stitching
indicator
lamp lights up.)
2. Set the numbers of stitchesfor steps A to D,
of
switch
0 .
using
A to D
3. By depressing the front part of the pedal once, you can
make the machine perform a
series
of operations from
sewingsteps A to D to trimming the threads.
-
10
-
^
Howtoincrease
the numberof stepsfor Pattern
$>
(upto 9 steps)
O
'^BSHPT
sc.
TESTA TESTB
TESTP
SBTM/A
WIPON
HOSAO
HOSAI
HOSBO
KOSBi
EC
BTTa
K>
•>
•D®
SW4
oLM-
•n
nQ||ro
•>
K>
•O CM®
REV
SCMBT
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SOFTON
SOFT 1/2
KOSOO
HOSOl
SCMATR SCMESP
ACTA ACTS
ACTD
H/N
SW6
oK
9AKP
K
K
For the nonnal sewing specification, the number of steps is
four (A, B, C and D) at the maximum. The number of steps
can be increased as many as nine, however, by changing the
settingofthe relevant DIP switch on the main circuit board
in
the
PSC
1.
Tum
box.
OFF the power switch.
2. Open the coverofthe PSC box.
•:
tr
K
d
a
E
3. Set DIP switch (SW44BSRPT) O on the main circuit
boardtoits ON position.
4.
Close
the
5.
Tum
the
coverofthe
ON the power switch. This completes the setting
DIP
switch.
PSC
box.
of
Now the sewing specification is as illustrated in the figure.
Set the numberofstitches for steps A to C, using A to C
switch
of
O . Dof
all the steps.
switch
O is
usedtospecify^enumber
of
(Example)
/A-»-B->-C^B=>The
A^B^C^B^C
numberofall
=>
the
steps
D=4 \
\ The number of allthe steps D = 5 /
(Precaution) If D is set to
"0",
all the numbers of stitches
specified for A through C will cometonothing
regardlessofthe
set
values
for
them.
11
-
2-6. SC-320 Control panel
1) Control panel
o o
+ -I- +
O Power indicator lamp (LED)
• Lights up when the power switch is turned ON.
• Stays ON for a while immediately after the power
switchisturned
Reverse
• Used to select a reverse stitching
OFF.
stitching
pattern
switch
pattern.
• When this switch is turned ON, lamp 0 comes ON,
while overlapping stitch indicator lamp 0 goes OFF.
Also, all indicator lamps associated to programmed stitching will go
0
Reverse
OFF.
stitehing pattern indicator lamp
(LED)
• Lights up when the reverse stitching pattern switch is
turned
(DN.
O Overlapping stitch
to
• Used
select an overlapping stitch pattern. When
pattern
selector switch
this switch is turned ON, lamp 0 lights up, while
reverse
stitching indicator lamp 0 goesOFF. Also,
ail indicator lamps associated to programmed stitching
will go
OFF.
0 Overlapping stitch indicator lamp (LED)
Lightsupwhen
is
turned
ON.
the
overlapping
stitch pattern
switch
0 Programmed stitching pattern ^ switch
• Used to select the
programmed
stitching
pattern
1.
• When this switch is turned ON, lamp 0 lights up.
O Programmed stitching pattern
(LED)
$>
indicator lamp
• Lights up when the programmed stitching pattern 1
switchisturned
ON.
0 Programmed stitching pattern ^ switch
• Used to select the programmed stitching pattern 2.
• When this switch is
turned
ON, lamp 0 lights up.
0 Programmed stitching
pattern
^ indicator lamp (LED)
' Lights up when the programmed stitching pattern 2
switchisturned
)
Switches
Used to set the numberofstitches within the range
0 to 9 for steps A to D.
"+":Increases
" :
Decreases
0
Stitch
number
ON.
for
setting
the
the
displays (LED)
the
numberofstitches
numberofstitches.
numberofstitches.
of
• Indicates the numberofstitches for each step (A to D).
0
Automatic
• Used to
sewing
reverse stitching
turn
ON or
start.
OFF
(for
automatic
start)
reverse
switch
stitching
• Each time this switch is pressed, it alternately turns
ONor OFF.
automatic reverse stitching at sewing start
(When
step Bhas been set to "0", the
cannot
be
set.)
0 AutcMnatic reverse stitching (for
(LED)
• Lights up when the automatic
start)
reverse
indicator lamp
stitching (for
start) switch is turned ON.
0
Automatic
• Used to sewing end.
reverse stitching (for end) switch
turn
ON or
OFF
automatic
reverse stitching at
• Each time this switch is pressed, it alternately turns
ON or OFF.
(When
step C has been set to "0", the
automatic reverse stitching for sewing end cannot be
set.)
0 Automatic reverse stitehing (for end) indicator lamp
(LED)
• Lights up when the automatic reverse stitching (for
end)
switch is
turned
ON.
at
(E>
Stepsetting
switch
• Usedtomake a step change in order to set the number
of
stitches, needle
ON/OFF,
thread trimming or
stop
position, presser
other
sewing conditions
foot
lifter
for each step in programnied stitching. .
• The step can be changed from 1 to 15. (If
there are steps for which the numbersofstitches
have
not
been set, only the stepofthe lowest number
will be displayed.)
"+"
: Increases
" : Decreases
I
Step
display (LED)
the
the
step
step
No.
No.
Displays a step (1 to 15).
I
Step
stitch
number
Used to set the
of
0 to 99 for each sewing step.
"+"
:
Increases
" :
Decreases
When
the
depressed,
or
decrease.
I
Step
"+"
the
numberofstitches continues to increase
stitch
number
setting
switch
numberofstitches within
the
numberofstitches.
the
numberofstitches.
or
side
of
the
switch
display (LED)
the
is
range
held
Displays the numberofstitches for a step within the
range
of 0 to 99.
I Machine
stop
mode
selector
switches
Used to select the following machine stop modes at
the time when a step has been sewn: o The machine will stop with the needle up. o The machine will stop with the needle down,
o The machine will stop with the presser foot up.
o The machine will stop with the presser foot down,
o The machine will stop after thread trimming.
Indicator lamps (LED) for showing
stop
modes:
The
machine will
The machine will stop with
stop
with
the
the
the
selected machine
needle up.
needle down.
The machine will stQpwith the presser foot up.
The machine will stop with the presser foot down. The machine will stop after thread trimming.
Step
insertion
switch
Usedtoinsert a new sewing step in preset sewing steps.
Step
deletion
switch
Used to delete a particular one from the preset'sewing
steps.
®
Restart
switch
• Used to restart sewing a programmed stitch step after
an empty bobbin has been replaced.
Switch
for
raising
the
needle
If the machine has stopped with its needle down, the needle goes up and stops in its highest position when
this
switchisturned
' Memory
battery
ON.
exhaustion
monitor
lamp (LED)
This lamp may light up if the machine has been unused
of
for an extended period
been
exhausted.
time and the battery has
2) Howto useeach stitdimg pattern
(1) Reversestitching pattern
0 O O O 0 0 O
^
Hi
w
^ ^ ^
•JUKI
ac-3eo
Y Y V
0
1. Pressreversestitching pattern switch O •
2. Reverse stitching pattern indicator lamp 0 lights up,
and stitch number displays (LEDs) 0 for steps A to D
indicate the preset numbersofstitches. Also, automatic
reverse
automatic
show
stitching (for start) switch 0 and automatic reverse
stitching (for end) switch 0 .
stitching (for start) indicator lamp O and
the
reverse
ON
stitching (for end) indicator lamp 0
and
OFF
conditions
of
automatic
reverse
-
Automatic
stitching
switch O
Stitching
Automatic
stitching
switch O
3. To change the numbers
reverse
(for
patterns
reverse
(for
end)
start)
OFF
OFF
ON
OFF
of
stitches, press the
OFF
ON
" sides of switches 0 for setting the numbers of
stitches located under stitch number displays 0 for
steps
A to D.
4. By combining ON and OFF settingsofautomatic reverse
stitching (for start) switch 0 and automatic reverse stitching (for end) switch 0 , four different stitching
patterns
13
are
available.
ON
ON
"+"
or
(2) Oveilapping stitch pattern
•JUKI
8C-3eO
Howtoincrease
the
number
1. Pressoverlappingstitching pattern switch O .
2.
O
GO
Overlapping and stitch
numbersofstitches.
3. To stitches located under stitch number
steps AtoD.
5
1
5
El
4. By cause
thentoactuate
(Precaution)
f T Y
of stepsfor Pattern (upto 9
stitch pattern indicator
number
change
"
depressing
the numbers of stitches,
sidesofswitches
the front part of the pedal once, you can
the
machine
its
The
for
separately
reverse
steps)
lamp
O
lights
up,
displays
O for setting the
© indicate the
press
the "+" or
numbers
displays
preset
of
© for
to sew steps A to D in sequence and
thread
trimmer.
numbersofstitches
steps A to D are stored In memory
from
the
stitching
pattern.
which have
numbersofstitches
been
set
for
a
^3)
Programmed
sc.
EC
TESTA TESTS
TESTP
SW4
SBTM/A
WIPON
NFEEO
^eSRPT
HOSAO
MOSAI
HOSBO
HOSBI
REV
stitching
K>
mih
O
pattern
SOFTON
SOFT 1/2
SCMATR
SCMESP
^
SCMBT
EOON
KOSOO
HOSDI
ACTA ACTB
ACTO
H/N
WKP
SW6
oK
For the normal sewing specification, the number of steps is
four (A, B, C and D) at the maximum. The number
of
steps
can be increased as many as nine, however, by changing the
of
setting
in
the
the relevant DIP switch on the main circuit board
PSC
box.
1. Turn OFF the power switch.
2. Open the coverofthe PSC box.
3. Set DIP switch (SW44BSRPT)
O
on
the
main
circuit
boardtoits ON position.
4.
Close
the
coverofthe
a
a
5. Turn ON the power switch. This completes the setting of
the
DIP
switch.
PSC
box.
Now the sewing specification is as illustrated in the figure.
Set the number of stitches for steps A to C, usingA to C of
switch
of
O . Dof
all the steps.
switch
O is
usedtospecify&enumber
(Example) A-^-B-^-C^B
A^B-J-C-^B-^C
The number of all the steps D = 4
=>
The numberofall the steps D = 5
(Precaution) if D is
setto"0",
specified regardlessofthe
forAthrough
set
all
the
numbersofstitches
C will
values
for
cometonothing them.
SjTi.
© ©
I
X
O
n
•JUKI
SC-38a
Y Y Y
1.
Checkingchanging
pattern
5>
1. Pressprogrammedstitching pattern 1 switch O .
2.
Automatic
reverse
stitching (for start) indicator
and automatic reverse stitching (for end) indicator lamp
©
light
A to D show
up, and stitch number
S] S]SIm .
3. Step display © shows i
display © shows12I01.
the
programmed
displays
111
, and step stitch number
O for steps
stitching
lamp
r+)
©
o 0
© ©
4. The needle-down stop lamp and the presser-foot-up stop
lamp of indicator lamps © (for showing the selected
machine stop modes at the time when a step has been
completed) light up.
5. If any of stitch number
reverse stitching pattern indicates a number of stitches
other than 4, then you can change it to 4 by pressing
the "+" or side of the corresponding switch © for
-
setting the number of stitches.
14
-
© ©
displays
[-1
o
(A to D) O for the
The
is
"+"
pressed
side of
onceata
ir
switch
time
f
Indication
display 0
on
Indication
display 0
Dn
i-
/ n
I u
on
u
Indicator lamps o
The
following
lamps
°-l-
%
light up
4M
Pattern
10
Step
—O
4
Zi
u
I
I
C
6. Each time the "+" side of step setting switch 0
pressed, the indications will change as illustrated above.
7. If the
numberofstitches
display
above,
switch
0 is different
change
0 for
it by
setting
shown
from
pressing
the
numberofstitches
on step stitch
those
the "+" or side of
given
in the table
fora step.
8. If a machine stop mode is different from those the table above, set it using switches 0 for selecting
jn
(_
I u
number
given
I n
u
n
u
IS
9. With these settings, you can sew the pattern illustrated
° 1
Step
20
1
10
Step
at left by repeating the seriesof operations
the front part of the pedal Automatic stop based on the
preset number of stitches Setting the pedal to its neutral position Depressingthe front part of the pedal.
At this time, the step display indicates the step No. being
in
sewn, while the stitch number display and the machine
stop
mode indicator lamps stay OFF.
the machine stop modes.
*
Selectingamachine
stop
mode
You can make the machine stop with its needle up after trimming the threads, or stop with its needle down or up without
trimming the threads, or stop with its presser foot up or down.
Howtoset
Example 1 :
the
desired machine
Setting
its
for
needle
making
down
and
stop
the
presser
mode
machine
foot
stop
up
with
Example
2 :
Setting
its
presser
for
making
footupafter
the
machine
thread
20
Step
2
Depressing
stop
with
trimming
3
°J_
^-5-
P
>€
How to release
%
Press
the
switches
1—I.
corresponding indicator lamps to
light up.
the
thread trimming switch The following two methods are available:
(T)
Press
This will place the needle-down and the corresponding indi
cator
indicator lamp for machine stop
goes
This
will
switch
lamp will light up. (The
after thread trimming
OFF.)
L^J
the
machine in
stop
cause
and
the
again.
mode,
• ^
° 1
-5-
-5_
ff"
Press
the
switches
i
—i
.
corresponding indicator lamps to
light up.
This
j>g| and
will
cause
the
In this case, the needle-up stop
lamp and the needle-down stop
lamp
stay
OFF.
Q)
Press
the
switch;-J-;
the switch j . This will
cause the corresponding indi
cator lamps to light up. (The indicator lamp for machine
stop
after thread trimming
OFF.)
goes
or
-
15
-
Adding
The
following
Illustrated
steps to the programmedstitching pattern 1
procedure
below:
shows
howtoadd
two
steps
tothe
programmed
rrartlo
stitching
pattern
1in
ordertosew
^
Step
the
pattern
6
s a a a
•JUKI
1)
Press
the "+"
k
times.
2)
Press
the
machine stop mode selector switches O •
3)
Press
the
4)
Keeponpressing
setting
switch@until20stitches
switch
"+"
side
of step setting
I—I and the
sideofstep
the
"+"
setting
sideofstep
®Fl
switch
switchI-r-|
switchOonce.
are
O three
stitch
number
reached.
iSBi
Fl!
Indicationonthe
of
Indication on the panel |
indicationonthe
ra.
panel
panel
j ^
J
Step1120
Indicationonthe
jn
panel
u
20l
Steps
I
5)
Press
the
switch
S machine stop mode selector switches O .
6)
Press
the "+"
7)
Keep on pressing the
setting
switch0until30stitches
8)
Press
the
machine
9)
You can set up to 15 steps.
10) By turning ON or OFF automatic (for start) switch O and automatic
(for end) switch © , you can
perform reverse stitching at the sewing start and/or
end.
(This cannot be programmedfor each step.)
switch
stop modeselector
i—I
and
the
side
of step settingswitch O
"+"
sideofstep
f—i
and
the
switches
switch
stitch
are
reached.
switch
© .
reverse
reverse
make
the machine
again.
number
f^l
stitching stitching
Indicationonthe
mdicationonthe
of
panel
panel
Indicationonthe
D n
Indicationonthe
panel
u
panel
(4)
Programmed
By
pressing
pattern
The
1.
panel
indications
Automatic
number
displays
stitching
programmed
and
reverse
stitching
(Ato D) ®
pattern
stitching
stitching
(for
will
^
pattern2switch
pattern
start)
show
storedinmemory
switch
[3]
S [2 H] .
@
® ,
and
you
can
areasshown
automatic
perform
reverse
check
below.
stitching
and
change
(for
end)
justasinthe
switch
programmed
a
O
are
ON,
stitching
and
stitch
The
"+"
sideofswitch
0 ispressedonce a,
a
time
•JUKI
ac-3ao"
Indicationondisplay
0
•J
J
Indicationondisplay
0
I D
I U
U
I
c n
D u
0
i
1
1
n
0
@ o 0
Indicatorlamps o
The
following
cr
cr
cr
lamps
light
i-f
'•
o
1 D
L.
o
140
up
0—6—0
Stitching
4
12
1'D1
pattern
12
0-<
\4'
0
4
iX
~sl
5
D C
c n
J u
°4-
50
50
4
I D
I
L.
n
u
-
17
-
(5) Inserting or deleting a stitching pattern
Based on the programmed stitching pattern 1, you can modify
step deletion switch O .
e
1
1
m
aJUKI
8C-3aO
.'1
ISl l!l
s s a a
0000
/ ! 1
0 0 0
1.
Step
insertion
1) Press programmed stitching pattern 1switch © .
2)
Press
step insertion switch O once.
switch
O
Indicationonthe
Indicationonthe
your
stitching pattern using step insertion switch O and
^ Q
So
Step
1
20
\ 5 5 ^
Step
panel
panel
2^^
1
1
o
L u
10
Step
J n
J n
u
Step
6
10 T
20
3
Step
Step
4
5
3) Keep on pressing the " sideofstep stitch number
settingswitch O until 5 stitchesare reached.
* By so doing, 5 stitches have been set for
the machine stop mode for stopping with the presser foot up and needle down has been inserted.
4)
Press
the "+"
5)
Press
step insertionswitch O once.
6) Keep on pressing the " sideofstep stitch number
setting
* By so doing. 5 stitches have been set for step 4. and
the
machine stop mode for stopping with the presser
foot up and needle down has been inserted.
7)
Press
the
side
of step setting
switch
O
until5stitches
"+"
sideof step setting switch © twice.
switch
are
step
© once.
reached.
indicationonthe
2. and
Indicationonthe
Indicationonthe
indicationonthe
1st
indicationonthe
panel
panel
panel
panel
panel
ff;
o
u
3
j
u
1
u
1
c
3
c
3
1 n
u
/ n
1 u
c
3
3 n
u
ff"
8) By depressingthe front part of the pedal, you
can sew the pattern illustrated above.
2nd
indicationonthe
* If the number of stitches and the machine
-
18
panel
the same,
same sewing conditions by pressing step insertion switch
-
c
O
you
can set the desired
/ n
1 u
numberofsteps
stop
mode are
of the
O-
Step
deletion switch O
The
following
the
stitching
pattern
procedure
1.
Step
isusedto deletea step,
_ 4
Steps
' Q
10
1
20
20
Step
which
5
has
been
inserted
using
c>
step
insertion
switch
O , inorderto
Step
3
restore
\5
Step 10 Step 4
Step
5
3
1) Press the "+" or " side of step setting switch ©
to
set
it to
step
1. indication on the panel
* If the machine is sewing a step, depress *he back part
of the pedal to trim the threads before working on
this operation.
2)
Press
3)
the "+"
Press
Stepdeletion switch © once.
side
of step setting
switch
©
once.
Indicationonthe
Indicationonthe
* The 5 stitches in step 2 and the machine stop mode
(machine
down)
stop
are deleted.
with
the
presser
foot up and
needle
Instead, the subsequent step 3 with 10 stitches and
the same machine stop mode becomes step 2.
4)
Press
the"+"
* By this deletionofone step, step 4 with 5 stitches is
side
ofstep
setting
switch©once.
Indicationonthe
replaced by step 3 with 5 stitches (the number of
stitches remains unchanged).
panel
panel
panel
Step
2
3 n
L.
Zi
u
3
1 n
1 u
3
j
1^
U
c
3
Iff
c
3
5)
Press
stepdeletion
* The 5 stitches in the previous step 4 (replaced by
step 3 in 3) above) are deleted, and the subsequent step 5 with 20 stitches is replaced by
6) Pressthe sideof step setting switch © once.
* As a result of
with 10 stitches is replaced by step 4 with 10 stitches
(the numberofstitches remains unchanged).
7) By depressing the front part of the pedal, you can
sew the stitching
switch
the
pattern
©
once.
step
3.
deletionofthe two steps, step 6
1 (shown at
top
right).
Indicationonthe
Indicationonthe
-
19
-
panel
panel
3
3
u
f
n
u
/ n
1 u
(6) How to operate the restart switch
The
restart
switchIstypically
usedtorestart
sewing a
step
afteranempty
bobbin
has
been
replaced.
@19
•JUKI
The bobbin thread has run out while
Set the pedal to the neutral position to stop sewing, and
depress the back part of the pedal to trim the threads.
o
Press
restart
switch
Replace the empty bobbin, route the bobbin thread, and
move
the
material
stitches in step 2. O
Depress
depresseduntil stop point Q of step 2 is reached.
the front part of the
o . o
back
a little to overlap the sewn
UUUU
+ +
sewing
pedal.
Hold the pedal
r+
a step. O
+
6)
At
stop
point
Q ,
press
restart
causes the next step to be displayed as I
the programmed stitching pattern will go on.
* If a thread breaks during the free sewing operation
initiated by restart switch O ( ®
pedal back to its neutral position, and then depress the back part of the pedal to actuate the thread trimmer.
Re-thread the machine, and move the material back a
little
before
you can resume the free sewing operation. After that,
perform steps 5) and 6).
(Note) Follow the procedure shown below when going back
to
1) The bobbin thread hasrun out
2)
Set the pedal back to its neutral position to
and depress the back part
threads. ©
3)
The
step
start from
the
pressing
first step
display
the
beginning.
restart
without
will
show
using restart switch O ^
switch
switch
of
O . By so
while
sewing
the pedal to trim the
I
111,enabling
O .
131
©),
set the
doing,
step 2. O
stop
sewing,
you
This
, and
to
-
20
-
3.
ADJUSTMENT
3-1.
Belt
Tension
Fig. 3-1
An
excessive
belt tension may
damage
the mainshaft bushingof the
machineor the motor bearing. On the contrary, an insufficient belt
tension may
cause
the belt to slipwithconsequent shortenedlifeof
the belt, and alsocause-otherfailures suchasoverrunafter thread
trimming
and
machine
stopswith
uneven
needle
stopheight.
To avoidsuch problems,usea belt of the appropriate length as specifiedin the instruction book. Adjust the belt tension using
nut O sothat the
when it is pressed with a finger.
center
ofthebelt
slacks
about18mm
(0.709")
3-2. Prevention
3-3. Checking
Motor
and
Vibration
Fig.
3-2
Correcting
(forNcompany's
the
Rotational
motor)
At the rearof the motor, there are hexagonbolt O and nut O
for preventing motor vibration between the table and motor base.
Adjustthe hexagonbolt so that it touches the table, then lockit
with
the
nut.
DirectionofSewing Machine
H
company's
N
company's
7
t
Fig.
3-3
Tum
the handwheel by handtobring the needle down. Turn ON the power switch, and check the rotation
directionofthe
observed from the handwheel side. To change the rotational directionofthe handwheel,
the
sewing
handwheel can be changedby using switch 0 mounted on the print circuit board located on the far side from you. ON :
(Note) There are two types of printed circuit boards as shown above.
handwheel.
machine,
CCW
The
handwheel
remove
screw
O in the
(counterclockwise)
should
rotateinits
PSC
box and open cover O . Nowthe rotationaldirectionof the
...
Standard setting OFF : CW(clockwise)
-
21
-
normal
direction,
i.e.,
counterclockwise
tum
as
OFF the power
to
3-4.
Pedal
1)
Adjusting
(1)
(2) Pressure required to depress the back part of
the pedaling
Pressure
of
the pedal
required to
pressure
depress
the front part
Hook pedal pressure adjustingspring O on
the right side to increase the pressure, or hook it on the left side to decrease the pressure.
the pedal
Screwadjustingscrew O in to increase
liniiitliiil/
'iiimiiiiiiiiiiit*^
Highest
pressure
Fully
<=>
screwed
In
Levelled
illlKlilMl
Lowest
1_1
nBiiiinniii
the pressure, or screw it out to decrease
Fig.
the
pressure
withinthe adjusting
range
3-4
shown at right.
(Note)
After
adjustment,
lightly
retighten
the
stopper
with
fingers
2) Adjusting the pedal stroke
The pedal stroke dependswhether the connecting rod isattached to position O or © . The stroke
be
smaller case, change
the
pressure
onlythe
when
the
connecting
requiredtodepress
stroke,
adjust
rodis
the
pedaling
fixedinposition
thefrontand
back
pressure
after
O than
parts
ofthe
fixing
when
pedal
the
connecting
it is
fixedinposition
increases.
rod.
When
© . Inthis
you
pressure
want
Stopper
will
to
Pedal
sensorA(asm)
(for version
without
AK-31, AK-34)
Fig.
3-5
Pedal
(for
AK-34)
version
sensorB(asm)
with
AK-31,
-
22
-
3)
Adjusting
variable
variable
resistorsonthe
resistors, adjustment
main
ranges
circuit
board
and functions.
and
Table
adjustment
3-1
range
table
Table
3-1
below
shows
the
adjusting
VRNo.
VRl
VR2
VR
symbol
BT
SOFT
Used to control the reverse stitching speed at sewing start/end.
The
BTVR
alone
controls
is always
200spm.
Used to adjust the speed of soft start for ensuring interlaced
threadsofbeginning
Pi
>
00
VR3
.c
at
a
'5'
a
•a
4>
o.
OT
VR4
LSH
LSL
Used to increasethe sewingspeed in the lowest speed sewing
mode actuated by pressingthe front part of the pedal.
Used to adjust
time
of thread trimming which requires to be performed at low
the
Function
both
BTL
and
stitches.
running speedofthe
BTH.
(The
difference
sewing machine at the
speed regardless of the speed control function of the pedal.
VR
Normally,itis
(If
the
5
MIN
Usedtochange
about
1 mm
LSL
fixed.
is changed,
the
accelerating
(0.039")
the
through
LSH is also
point
pedal
changed.)
from
stroke.
low
speed
by
Adjustment
1000~3500
_ . ,
Standard:
Counterclockwise:
Clockwise:
200~2000spm. Standard:
Counterclockwise:
Clockwise:
LSL~+200spm.
Standard:
Counterclockwise: Clockwise:
150
^300
Standard:
Counterclockwise: Clockwise:
About1mm
Standard:
Counterclockwise:
Clockwise:
range
spm.
BTL
ITOOspm.
i900spm.
Decreases
Increase
SOOspm.
Decreases
Increases
200spm.
Decreases
Increases
spm. Fixedto200spm.
Decreases
Increases
(0.039")
Fully
clockwise
Low
speed
stroke,
Low
speed
short
storke,
long
VR6
FLSW
Used to adjust the position where the presser foot is raised
by depressing the back
part
of tlie pedal in a version with
Standard:
RefertoP.25.
AK-31, AK-34.
Pi
>
00
c
at
p
VR
•a'
C3 V
o
at
£
VR8
TSW
7
Used to adjust the position where tlie thread trimmer is
actuated by depressing the back part of the pedal.
LSW
Used to adjust the stroke for starting sewing by depressing
the
front
partofthe
pedal.
Clockwise:Increases
Counterclockwise:
Standard:
RefertoP.24.
Clockwise:
Counterclockwise:
'
Standard:
RefertoP.24.
Clockwise:Increases
Counterclockwise:
Increases
stroke
Decreases
stroke
stroke
Decreases
stroke
stroke
Decreases
stroke
-
23
-
4) PedaladjustmgVRand its function in detail
ErHl"B
-IICI
I
Standard
ETjsP
S 1 VR« VR7 VR*
5—1
F—2
value
Rsr
I
rn
rn
fusw''Tsw'
Fig.
Pedal
sensorAasm.
(excluding
rn
'tsw'
SZlHihB
3-6
the
AK-31 and -34)
(1)
Adjustmg
the pedalstroke
o How to adjust the stroke of the pedal before starting
sewing.
The stroke can be adjusted usingVR8
(LSW).
Turn
this dial clockwise O using a small screwdriver
increasethe pedal stroke, or counterclockwise O to
decrease it. (Take care
nottoturn
the dial excessively,
otherwise the sewingmachine failsto stop when the pedal is returned to its neutral position or failstorun
when the front part of the pedal is depressed.)
Pedal
sensorBasm.
(for
the
AK-31
and
-34)
to
Fig.
3-7
o Howto adjust the pedal stroke for turning ON the thread trimmer
The
pedal
strokefor
clockwisetoincrease
(Takecarenot to tum the dial
returned
to its
turningONthe
the
neutral
thread
trimmer
stroke, or counterclockwise to decrease
excessively,
positionorthread
otherwise thread
trimming
canbe
isnotactuated
adjusted
trimming
depressed.)
Standard
value
Pedal
sensorAasm.
(excluding the AK-31 and -34)
I
using
VR7
(TSW)inFig.
it.
isactuatedimmediately after the pedalis
even
when
thebackpart ofthe
Pedal
sensorBasm.
(for
the
AK-31
and
-34)
3-6.
Turnthis
pedal
dial
is
OO,
Fig.
3-8
-
24
-
Standard
r-^
value
Pedal
sensorBasm.
u u
Fig.
3-9
o Adjusting the accelerating point (from200 spm)
Asshown in Fig. 3-10, the acceleratingpoint can be
adjusted
about1mm(0.039").
When
VR5
(MIN)
shownin Fig. 3-11is turned fully clockwise, the low
speedstroke shownby the solidline (Fig.3-10)is
shortened,
When
resulting
in an earlier accelerating
timing.
VR5is turned counterclockwise, the lowspeed
stroke is lengthened'as shown by the broken line,
resultingin a later acceleratingtiming.
(Normally, VR5 is turned fully clockwise before
shipment.)
o Howto adjust the stroke for actuating the
or
-34
Auto-lifter
For the sewingmachineprovidedwith the or -34,depressing the back part of the pedalraises
the presser foot just as with the knee switch.
Adjust the stroke for actuating the auto-lifter
usingVR6 (FLSW)in Fig. 3-6.
clockwisetoincrease
wisetodecrease
(Take care
nottotum
the
it.
the dial excessively,other
wise the auto-lifter will be
if
the knee switch is
kept
Tum
this dial
stroke,orcounterclock
kept
in its ON state as
turned ON when the
pedal is retumed to its neutral position.)
Fully
clockwise
Fully
counterclockwise
Low
About1mm
(0.039'
speed
AK-31
AK-31
3-5. Maximum sewing speed
1) Adjusting the low speed
-pot
eev y M(
I
cc a S S R87 5
....
xoc
itu.
j f 3
M
n^an
r-MOO—
J?'
VR2
VR3
LSH
Fig. 3-11
VR4
LSL
rnrnrnrnrni-
I I I I I I I I I I
BT
SOFT
s I
VR5
MIN
, • o
o~
S - m
s--s
mm
B-IUI
mm
Pedal
stroke
Fig.
3-10
o In the conventional
sewing
machine,thread trimming
speed determines the low speed. In this machine,
however,only the low speed which is controlled by
of
depressing the front part
the pedal can be increased
usingVR3 (LSH)in Fig. 3-11 without changing the
thread trimming speed.
Tum
the dial clockwiseto
increase the low speed of the sewingmachine, or
counterclockwise to decrease it. The adjustablerange
isfrom the thread trimming speed(LSL)to approxi
mately
200
s.pjn.
(Normally, the dialhasbeen tumed fully counterclock
wiseat the timeofdelivery.)
-
25
-
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