JUKI LU-2810-6 User manual

LU-2810-6, 2860-6
INSTRUCTION MANUAL

ii
CONTENTS
1. SPECIFICATIONS.......................................................................................................... 1
2. INSTALLATION.............................................................................................................. 1
3. INSTALLING THE BELT COVER AND THE BELT ....................................................... 2
4. ADJUSTING THE BELT TENSION................................................................................ 3
5. INSTALLING THE SYNCHRONIZER ............................................................................ 3
6. ADJUSTING THE SYNCHRONIZER............................................................................. 4
7. INSTALLING THE OIL SHIELD..................................................................................... 6
8. PNEUMATIC COMPONENTS........................................................................................ 6
9. WIRING THE MACHINE HEAD..................................................................................... 8
10. AIR PIPING AND MACHINE-HEAD WIRING .............................................................. 11
11. SEWING SPEED TABLE ............................................................................................. 12
CAUTION
This Instruction Manual for the LU-2810-6/-2860-6) only describes their differences from the
standard models (LU-2810/-2810-7, LU-2860/-2860-7).
For safety-related information, carefully read and fully understand "Safety precautions"
described in the Instruction Manual for the standard models before using your sewing ma-
chine.

– 1 –
Model
LU-2810-6
(1-needle sewing machine with a thread trimmer
and V-belt)
LU-2860-6
(2-needle sewing machine with a thread trimmer
and V-belt)
Sewing speed
Max. 3,000 sti/min Max. 2,700 sti/min
Refer to "11. SEWING SPEED TABLE" p.12.
Stitch length (max.) Normal feed : 9 mm Reverse feed : 9 mm
Needle GROZ-BECKERT 135 x 17
(Nm 125 to Nm 180) (Standard : Nm 160)
Thread #30 to #5 (US : #46 to #138, Europe : 20/3 to 60/3)
Hook Vertical-axis 2.0-fold capacity hook
Lift of presser foot Hand lifter lever : 10 mm By knee lifter, Auto-lifter: 20 mm
Lubricating oil JUKI New Defrix Oil No.1 or JUKI MACHINE OIL #7
Noise
* 1
-Equivalent continuous emission sound pressure
level (LpA) at the workstation:
A-weighted value of 83.0 dB; (Includes KpA = 2.5
dB); according to ISO 10821- C.6.2 - ISO 11204
GR2 at 3,000 sti/min.
-Sound power level (LWA);
A-weighted value of 88.5 dB; (Includes KWA = 2.5
dB); according to ISO 10821- C.6.2 - ISO 3744
GR2 at 3,000 sti/min.
-Equivalent continuous emission sound pressure
level (LpA) at the workstation:
A-weighted value of 83.0 dB; (Includes KpA = 2.5
dB); according to ISO 10821- C.6.2 - ISO 11204
GR2 at 2,700 sti/min.
-Sound power level (LWA);
A-weighted value of 88.5 dB; (Includes KWA = 2.5
dB); according to ISO 10821- C.6.2 - ISO 3744
GR2 at 2,700 sti/min.
1. SPECIFICATIONS
2. INSTALLATION
Refer to "2. INSTALLATION" p.2 in the Instruction Manual for the LU-2810, -2810-7, -2860 and -2860-7,
packaged with the sewing machine, for how to install the sewing machine.
* 1 The aforementioned noise level is the one in the case of using the control box (SC-922) made by JUKI.

– 2 –
3. INSTALLING THE BELT COVER AND THE BELT
(Installation procedure)
1) Remove belt cover A ❶.
2) Pass the 14P connector which puts cables to-
gether and the air tube through the slotted hole
in the table.
3) Put the V-belt on the sewing machine pulley.
4) Adjust the belt tension.
5) Pass synchronizer support shaft ❷and washer
❸through mounting hole in belt cover A ❶and
x the synchronizer support shaft with washer
❸and nut ❹.
6) Mount belt cover A ❶.
7) Install belt cover B ❺on the table.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
❶
❺
Slotted hole in
the table
V-belt
❶
❸❷
❸❹
❶
Be sure to use the sewing machine with
safety devices ❶and ❺installed.

– 3 –
5. INSTALLING THE SYNCHRONIZER
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
(Installation procedure)
1) Fix synchronizer ange ❶on the end of the
main shaft.
2) Fix the synchronizer on synchronizer ange ❶.
3) Fix synchronizer support plate ❷with setscrew
❸so as to prevent the synchronizer from rotat-
ing.
Be sure to remove the connector for the
sewing machine for the sake of safety be-
fore checking the upper and lower positions
of the synchronizer.
❶
❷❸
Synchronizer
4. ADJUSTING THE BELT TENSION
Adjust the belt tension with the height of the motor
so that the belt sags 15 mm when the center of V
belt is applied with a 9.8 N load.
15mm
Motor pulley
Handwheel
9.8N
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.

– 4 –
❷
C
❶
6. ADJUSTING THE SYNCHRONIZER
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
Adjust the upper stop position (needle-up stop posi-
tion) so that the marker line on belt cover A ❷aligns
with the marker dot (one) on handwheel ❶(70 °po-
sition).
Adjust the lower stop position (needle-down stop
position) so that the needle bar stops at the position
where the needle bar goes up from the lower dead
point (180 °) by approximately 13 mm (120 °posi-
tion). (The position which is reached by turning the
handwheel from the lower end of the needle bar in
the reverse direction of rotation of the main shaft (di-
rection C))
Marker dot
Marker dot on the handwheel
Opener timing adjustment
(three marker dots)
314 °
Thread trimming
cam alignment
(two marker dots)
275 °
Upper stop position
(one marker dot)
70 °
Marker line

– 5 –
(How to remove the handwheel)
To remove handwheel ❶, loosen screws ❷and ❸
and remove handwheel ❶in such a state that it is
assembled with handwheel A ❹.
Do not remove only handwheel ❶by loos-
ening setscrew ❺.
(How to assemble the handwheel)
Check to make sure that handwheel A ❹does not
come in contact with cylinder ❼when screw ❷of
handwheel A ❹is brought to the position where it is
aligned with the at section of main shaft ❻. Then,
fix the handwheel on main shaft ❻. At this time,
main shaft ❻protrude from handwheel ❶by ap-
proximately 7 mm.
❺
❶
❷
❸
❹
❼
❻
Flat section

– 6 –
7. INSTALLING THE OIL SHIELD
Install oil shield ❶, supplied with the unit, on the
frame with screws ❷.
8. PNEUMATIC COMPONENTS
(1) Installing the solenoid valve mounting plate
Install solenoid valve mounting plate asm. ❶to
the undersurface of the table with screw ❷and
washer ❸supplied with the unit.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
WARNING :
To protect against possible personal injury due to abrupt start of the machine, be sure to start the
following work after turning the power off and ascertaining that the motor is at rest.
LU-2810-6
LU-2860-6
❷
❶
❷
❶❷
❶
❸
❷

– 7 –
(4) Adjusting the air pressure
1) The operating air pressure is 0.5 to 0.55 MPa.
Adjust the air pressure with adjusting knob ❶of
the regulator.
2) When water has accumulated in regulator A
section, turn drain cock ❷to drain the water.
Decrease Increase
(3) Installing the regulator
1) Install regulator (asm.) ❶on mounting plate
❺with screw ❷, spring washer ❸and nut ❹
which are supplied with the unit.
2) Install couplings ❻and ❼on regulator ❶.
3) Install mounting plate ❺on the underside of the
table.
4) Connect ø6 air tube coming from the solenoid
valve asm. to coupling ❻.
❷
❶
❺
❻
❼
❹
❸
(2) Connecting the air tube and the solenoid
valve cable
Connect the air tubes and the solenoid valve
supplied with the unit to the locations shown
below.
Solenoid valve Tube number Cable number
❶- B1
CN155
❶- A2
❷- A4 CN151
❸- A6 CN153
❹- A8 CN152
ø8 air tube
ø6 air tube
❶
❷
❸
❹
AB
Solenoid valve
cable
❶
❷
A

– 8 –
9. WIRING THE MACHINE HEAD
WARNING :
Junction cord preparation and wiring to the control box must be carried out by an electrical engineer
without exceptions. Be sure to turn off the power to the sewing machine and wait for ve minutes before
starting the wiring work.
If the pin numbers of the connectors are not correctly connected, errors and breakage of parts and
control box can result. Carefully connect the machine-head connectors and the control-box connectors.
❶
❷
(5) Exhaust tube
Pass ø8 exhaust air tube ❶through hole ❷in
the table stand and other relevant hole. Then,
route the air tube downward. If the humidity is
high, water may come out of the air tube.
(1) Wiring diagram
Details of the connectors wired to the machine head are as described below.
Refer to "(2) Details of connectors" on the next page for details of connectors ①to ④and layout of
the pins.
Tension release solenoid (upper side)
Tension release solenoid (lower side)
Alternate up/down limit switch
Reverse feed switch
6-gang switch
Thread trimming solenoid (right side)
Thread trimming solenoid (left side)
Presser bar lifting cylinder solenoid valve: CN151
Alternate up/down cylinder solenoid valve: CN153
2-pitch cylinder solenoid valve: CN155
FG (earth cord)
Knee switch
③: CN144 / 16P connector
6-gang switch
④: CN102 / 12P connector
Solenoid valve
②: CN36 / 14P connector
Tension release solenoid (lower side)
Tension release solenoid (upper side)
Thread trimming solenoid (left side)
Thread trimming solenoid (right side)
Reverse feed switch
FG (earth cord)
Knee switch
①: CN158 / 4P connector
Alternate up/down limit switch
(lower side)
Alternate up/down limit switch
(upper side)
Reverse feed cylinder solenoid valve: CN152

– 9 –
(2) Details of connectors
This clause explains details of connectors ①to ④and layout of the pins shown in the wiring diagram.
Identify the connector pin number as described below.
You may nd the numeric characters indicat-
ed on the connector when viewing from the
direction of the arrow.
The numeric character indicated
on the connector, as viewed
from the direction of the arrow,
is the connector pin number.
Connector
* When connecting the connectors to the control box, prepare a junction cord using the below-stated connector pin terminal.
Part number of the target connector: HK034620040 (MOLEX: 5559-04P)
Part number of the target pin terminal: HK034630000 (MOLEX: 5558TL)
①CN158: 4P connector (alternate up/down switch)
Pin No. Part name Color of cable Remarks
1 Alternate up/down limit switch (lower side) White
2 Alternate up/down limit switch (upper side) Red
3 Alternate up/down limit switch (lower side) Black GND
4 Alternate up/down limit switch (upper side) Green GND
5 4 3 2 1
10 9 7 6
2 1
4 3

– 10 –
②CN36: 14P connector (solenoid, switch)
* When connecting the connectors to the control box, prepare a junction cord using the below-stated connector pin terminal.
Part number of the target connector: HK034620140 (MOLEX: 5559-14P)
Part number of the target pin terminal: HK034630000 (MOLEX: 5558TL)
Pin No. Part name Color of cable Remarks
1 Tension release solenoid (lower side) Black
2 Tension release solenoid (upper side) Black
3－ － －
4 Knee switch White
5 Reverse feed switch Black
6 Thread trimming solenoid (left side) Black
7 Thread trimming solenoid (right side) Black
8 Tension release solenoid (lower side) White Power supply (+27 V)
9 Tension release solenoid (upper side) White Power supply (+27 V)
10 FG (earth cord) Green / Yellow FG
11 Knee switch Black GND
12 Reverse feed switch White GND
13 Thread trimming solenoid (left side) White Power supply (+27 V)
14 Thread trimming solenoid (right side) White Power supply (+27 V)
③CN144: 16P connector (6-gang switch)
* When connecting the connectors to the control box, prepare a junction cord using the below-stated connector pin terminal.
Part number of the target connector: HK034620160 (MOLEX: 5559-16P)
Part number of the target pin terminal: HK034630000 (MOLEX: 5558TL)
Pin No. Part name Color of cable Remarks
1 6-gang switch Orange (red dot 1)
+5V * Do not connect the +24V connector. If the +24V
connector is connected to this switch, the LED
burnout can occur.
2 6-gang switch Orange (black dot 1) SW1 (DLSW)
3－Gray (red dot 1) SW2 (Automatic reverse feed prohibition switch)
4 6-gang switch Gray (black dot 1) SW3 (One-stitch correction switch)
5 6-gang switch White (red dot 1) SW4 (Pitch changeover switch)
6 6-gang switch White (black dot 1) SW5 (Thread tension changeover switch)
7 6-gang switch Yellow (red dot 1) SW6 (Thread clamp switch)
8 6-gang switch Yellow (black dot 1) GND
9 6-gang switch Pink (red dot 1) LED1 (DLSW LED)
10 6-gang switch Pink (black dot 1) LED2 (Automatic reverse feed prohibition switch LED)
11 6-gang switch Orange (red dot 2) LED3 (One-stitch correction switch LED)
12 6-gang switch Orange (black dot 2) LED4 (Pitch changeover switch LED)
13 6-gang switch Gray (red dot 2) LED5 (Thread tension changeover switch LED)
14 6-gang switch Gray (black dot 2) LED6 (Thread clamp switch LED)
15 6-gang switch White (red dot 2) SW7 (Machine head fall sensor)
16 － － －
2 14 357 6
9 811 101214 13
2 14 357 6
10 912 111315 14
8
16

– 11 –
④CN102: 12P connector (Solenoid valve)
* When connecting the connectors to the control box, prepare a junction cord using the below-stated connector pin terminal.
Part number of the target connector: HK034620120 (MOLEX: 5559-12P)
Part number of the target pin terminal: HK034630000 (MOLEX: 5558TL)
Pin No. Part name Color of cable Remarks
1 Solenoid valve (CN151) Black Presser bar lifting cylinder
2 Solenoid valve (CN152) Black Reverse feed cylinder
3 Solenoid valve (CN153) Black Alternate up/down cylinder
4－ － －
5 Solenoid valve (CN155) Black 2-pitch cylinder
6－ － －
7 Solenoid valve (CN151) Red +24V
8 Solenoid valve (CN152) Red +24V
9 Solenoid valve (CN153) Red +24V
10 － － －
11 Solenoid valve (CN155) Red +24V
12 － － －
2 14 356
8 710 91112
10. AIR PIPING AND MACHINE-HEAD WIRING
Air pipe and machine-head cord must be sufciently
long, at the time of piping and wiring, to allow the
machine head to tilts smoothly.
Slightly
longer
to allow
leeway

– 12 –
Refer to the Instruction Manual for the LU-2810, -2810-7, -2860 and -2860-7 packaged with the sewing
machine for the installation and adjustment of other parts.
Refer to the clauses which describe the LU-2810-7 for the LU-2810-6.
Refer to the clauses which describe the LU-2860-7 for the LU-2860-6.
11. SEWING SPEED TABLE
Operate the sewing machine at a speed equal to or lower than the maximum sewing speed selected from
those shown in the table below according to the sewing conditions.
Amount of alternate vertical movement
of the walking foot and presser foot Stitch length : 7 mm or less Stitch length : More than 7 mm and 9 mm or less
Less than 3 mm 3,000 sti/min *2,000 sti/min
More than 3 mm and 4 mm or less 2,400 sti/min 2,000 sti/min
More than 4 mm and 5 mm or less 2,000 sti/min 2,000 sti/min
More than 5 mm and 9 mm or less 1,800 sti/min 1,800 sti/min
* For the LU-2860-6, the maximum sewing speed is 2,700 sti/min.
If the sewing machine performs sewing at a speed which exceeds the described one, breakage of
part(s) or a decrease in service life can be caused. Be sure to follow the maximum sewing speed.