Juki Needle Positioner User Manual
POSITIONER
Technical
Manual
INSTALLATION
INSTRUCTION
TROUBLE
SERVICE
SHOOTING
PARTS
LIST
TOKYO JUKI INDUSTRIAL CO., LTD.
TABLE
OF
CONTENTS
Subject
1 INTRODUCTION 1
2 FEATURES 1
3 MODEL AND TYPES 2
4 INSTALLATION 3
5 ELECTRICAL CONNECTIONS 4
6 OPERATION 5
7 MAINTENANCE 8
8 HOW TO CHECK THE DRIVE
9 DIMENSION
10 PARTS
LIST
UNIT
Page
13
15
16
INTRQWCTION
This needle positioner represents a new
concept
in needle-positioning motor. This device
meets
all
requirements for control functions that may be needed in the future. It is controlled by an electronic
circuit which enables the
of the sewing machine
simply touching
1-1
Componentofthe
the
powerful
promptly.
pedal softly.
needle
electro-magnetic clutch and brake to increase and decrease the speed
Variations of the operational speed are stepless and accomplished by
positioner
This electronic needle positioner consists of a squirrel-cage induction motor, an electro-magnetic
clutch and brake, and a control box
system
and
are
INDUCTION
MOTOR
easily
• ^
replaced.
and
synchronizer.
All
assemblies
ELECTRO-MAGNETIC
CLUTCH
^CONTROL
AND
BOX
BRAKE
are
designed in a modular
1-2
Principleofoperation
The electro-magnetic clutch
output shaft, the clutch end cover,
2) When the clutch coil is energized by operating the pedal, the moving disc is
and
brake consists of the clutch coil
and
two moving
discs
which
and
brake coil assemblies, the
are
slidable on the output shaft, (fig.
engaged
friction disc fixed on the flywheel. And then the rotation is transferred to the output shaft. When the
brake
coil
is energized, the
cover, And it
FRICTION
MOVING
FLY
MOTOR
stops
the rotating output shaft.
DISC
DISC.
WHEEL
SHAFT
CLUTCH
moving
COIL
disc is engaged
\(t/ith
the
friction
disc
BRAKE
fixed
on the clutch end
COIL
FRICTION
CLUTCH
MOVING
OUTPUT
END
DISC,
SHAFT
FEATURES
PEDAL
Pedal operation alters the speed of the sewing machine, and maximum speed of the output shaft
can be easily adjusted. As a result, straight, curved and zig-zag sewing can be smoothly
accomplish^,
OPERATION
therefore,
CONTROLS
improving
the
FUNCTIONAL
efficiency
and
SPEED
simplicityofoperation.
with the
DISC
COVER
HAND
The hand wheel
WHEEL
FLEXIBILITY
can
be freely turned to any position by hand even when the sewing machine is
stopped. This is a great convenience, should the thread become entangled,
TIRELESS
OPERATION
Only modest foot pressure is required to operate the pedal optimally. Strength of the pedal
fowarding can be adjusted by changing the hook-up position of the spring. Therefore,
can
conveniently adjust the pedal to hisorher
desired
foot
pressure.
each
operator
AUTOMATED
Long operational
QUALITY
life
and extraordinarily high
CONTROL
CIRCUITRY
reliability
are characteristic of the most advanced
analog and digital semi-conductor elements. Because all control circuitry is controlled by electric
signals, programmed operation and control can be systematized. This enables automatically-
controlled operation of a number of sewing machines,
NEEDLE
POSITIONING
AND
STOPPING
ACCURACY
Specially designed electro-magnetic clutch and brake ensure veryprecise needle
stopping accuracy, which helps prevent needle breakage.
ABNORMAL
(a)
Abnormal
function
operation.
(b)incase
clutch automatically.
{c)When
the protection circuit disconnects the back tack solenoid in 12
from burning.
These
JAMMING
Aspecial
clutch, and therefore, protecting the motor
CLUTCH
Should
with a turn of the adjustment screw.
the
MODEL
3-1
MODEL
OPERATION
high
because
the
V-belt
the
manual
factors
OR
protection
AND
clutch
AND
speed operation results thread-breakage.
Should
this occur, the pedal
it is interlocked by an electric signal which safeguards against irregular pedal
is off and the pedal is pressed accidentally, a protection circuitdisengages the
back tack
switchIsaccidentally pressed
while
the
seconds
enhance
FREEZING
BRAKE
and
the safety of the unit greatly.
PREVENTION
circuit
brake
is engaged
AIR
need
when
GAP
ADJUSTMENT
operational
the
machine
from
burning out.
adjustment,
freezes,
automatically
the airgap space can be
'or': ,V
TYPES
positioning
sewing
machine is stopped,
to protect the solenoid
disengaging
easily
^'2
will
altered
and
not
the
Phase
*
Modelsof2
3-2
MOTOR
ENAP-DS
ENAM-DS
3-3
CONTROL
Function
ENC3E-JTG
ENC3E-JTH
ENC3E-JTK
ENC3E-JTL
Model
EPS1E-JTG
EPS1E-JTH
EPS1E-JTK
EPS1E-JTL
EPS3E-JTG
EPS3E-JTH
EPS3E-JTK
EPS3E.JTL
positioning
Phase
BOX
Positioning
function
Needle
are
also
Voltage
115V
Trimming
Motor
ENAP-DS
ENAM-DS
available
Thread
O
Control
ENC3E-JTG
ENC3E-JTH
ENC3E-JTK
ENC3E-JTL
ENC3E-JTG
ENC3E-JTH
ENC3E-JTK
ENC3E-JTL
EPS1B-JA2(1phase),
Frequency
60Hz
60Hz
Thread
Wiping
O
Output
box
EPS3B-JA2(3phase)
3/4HP
3/4HP
Presser
Foot
Lifting
Pole
2P
2P
Synchronizer
ENS2-02
ENS2-02
Rating
Cont.
Cont.
Automatic
Back
Tacking
3-4
SYNCHRONIZER
Type Coupling to
ENS2-02 Flange type
3-5
AVAILABLE
MODEL
EPS1E-JTG
EPS1E-JTH
EPS3E-JTG
EPS3E-JTH
EPS1E-JTK
EPS1E-JTL
EPS3E-JTK
EPS3E-JTL
All
motors
If
your machine speed is not 5000
supplier.
EPS1B-JA2,
MODELS
are
supplied with the pulley for
EPS3B-JA2
canbeapplicabletoany
the
sewing machine
SEWING
DDL-555-4-3
DDL-555H-4-1
DDL-555H-4-3
DLD-432-4-1
DLN-415-4-1
DLU-45D-4-1
DDL-555-4-3B
DDL-555H-4-3B
DLN-415-4-1B
DLD-432-4-3B
DLU-450-4-1B
5000
RPM
{refer
Performance
Needle down
and
up position signal,
tachogenerator
MACHINE
MACHINE
5000
4000
4000
4500
5000
4000
5000
4000
5000
4500
4000
SPEED
RPM
RPM
RPM
RPM
RPM
RPM
RPM
RPM
RPM
RPM
RPM
RPM.
above table), please ask the proper pulleyto your
machine.
and
(MAX)
INSTALLATIQ
4-1 Installation of
1)
Drill
three holes in the sewing machine table. (See fig. 3)
ftg. 3
unit
2) Install the motor beneath the sewing machine table, observing the
A. Don't
B. The motor should be
machine
C. The V-belt connecting the motor to the sewing machine should be tensioned properly. It
should
approximately
Excessive tension may not only shorten the life of the bearings, but could also affect the
operation of the
Loose tension will'affect the position
D.After installing the motor,
hand. If not,
motortosewing
mm
(Inches)
3—^9 (3—0.35dia.)
droporsubject
are
properly alined.
be
possible to pull a correctly tensioned belt together between two fingers within
2cm
It to
mountedsothat
(0.80 Inches).
sewing
machine.
shock.
machine
machine
the
table
drive pulleys of the motor
accuracy.
please
please
adjust the clutch air gap,asinstructed in item "7, maintenance,"
make
sure
that the output shaft
Moior
center
line
Beit
hole
center
line
following
can
precautions:
and
the sewing
be freely turned by
4-2
Installation of
Attach
synchronizer
the synchronizer-to the
handwheel
of the
sewing
machine.
(See
fig.
4)
ftg. 4
Synchronizer axle
Screw
Handwheel
Synchroniz^^r^^^^^N
Retaining bolt
Band
Note: The cable extending from the synchronizer should be
5-1
The grounding terminal should be
machine.
TTMCAICONNECTIO
Diagrams
fig. 511.^.oAriT^
y
for
I
torn.
,,
MAIN
power
'IB
LUE(
"IyELLOW
1^
WHITE
I n E
iLACK
'ii—<t>—
Di
Single
supply
QR^
GREEN
Bu>CK
WHITE
^
20W
^
phase
connections
DIRECTION OF ROTATION
(FACING
TO REVERSE
fixed
THE
INTERCHANGE
RED
PULLEY)
ROTATION
BLUE
LEAD
Grounding terminal
•Nut
fixed
to the retaining bolt
with
the band.
by mean of the screw diagramed on the sewing
I I
GREEN
LINE
LIMETOREVERSE
INTERCHANGE
^
LEADS
LE
t 6V
20W
Three
phase
ROTATION
ANY TWO
Before making any connections to
conformancetothe
5-2
Change
for
the
line voltage.
direction
If the sewing machine is
operated
the
of rotation
in the reverse direction,besure
the wiringasindicated on the connection diagram.
5-3
Wiring
The solenoid
connectors
connections
connectors
of
the
sewing
of the sewing machine shall be
on the connector panelasindicated on the following drawings.
fig. 6 ENC3E-JTG
POWER
fig. 7 ENC3E-JTH
POWER
1
SUPPLY
1
WIPER
SUPPLY
TRIMMER
FOOT
CLUTCH/BRAKE
SYNCHRONIZER
CLUTCH/BRAKE
LIFTER
power supply,
machine
1 1
1
check
the nameplate rating to
to turn off the motor
solenoids.
connected
fig. 8 ENC3E-JTK
POWER
SUPPLY
WIPER
fig. 9 ENC3E-JTL
POWER
SUPPLY
to their corresponding
1
TRIMMER
BACK
FOOT
ensure
and
CLUTCH/BRAKE
TACKER
SYNCHRONIZER
CLUTCH/BRAKE
LIFTER
change
1
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