JUKI LU-2868-7, LU-2818-7, LU-2860-7, LU-2860, LU-2810-7 Instruction Manual
...
LU-2810, 2810-7, 2860, 2860-7,
2818-7, 2868-7
INSTRUCTION MANUAL
CONTENTS
1. SPECIFICATIONS ............................................................................................................ 1
2. INSTALLATION ................................................................................................................ 4
2-1. Installation of the sewing machine ....................................................................................................4
2-2. Installing the belt cover and the belt (LU-2810, LU-2860) ...............................................................7
2-3. Adjusting the belt tension (LU-2810, LU-2860) ................................................................................. 7
2-4. Installing the oil shield .......................................................................................................................8
2-5. Pneumatic components (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) ....................................... 8
2-6. Installing the thread stand ...............................................................................................................10
2-7. Installing the thread guide pin ......................................................................................................... 11
3. PREPARATION OF THE SEWING MACHINE .............................................................. 12
3-1. Lubrication .........................................................................................................................................12
3-2. Attaching the needle .........................................................................................................................14
3-3. Attaching and removing the bobbin ................................................................................................ 15
3-4. Threading the hook ........................................................................................................................... 15
3-5. Winding a bobbin .............................................................................................................................. 16
3-6. Threading the machine head ...........................................................................................................17
3-7. How to set the model of the machine head ....................................................................................19
3-8.
Adjusting the machine head (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) ...................................... 21
4. ADJUSTING THE SEWING MACHINE .........................................................................23
4-1. Adjusting the stitch length ...............................................................................................................23
4-2. Thread tension ..................................................................................................................................24
4-3. Thread take-up spring ......................................................................................................................25
4-4. Adjusting the pressure of the presser foot ..................................................................................... 26
4-5. Needle-to-hook relation .................................................................................................................... 27
4-6. Adjusting the hook needle guard ....................................................................................................28
4-7. Adjusting the bobbin case opening lever ....................................................................................... 29
4-8. Adjusting the position of counter knife, knife pressure and clamp pressure ............................. 30
4-9. Adjusting the condensation stitch (LU-2818-7, LU-2868-7) ........................................................... 31
4-10. Adjusting the amount of the alternating vertical movement of the walking foot and the
presser foot .......................................................................................................................................32
5. OPERATION OF THE SEWING MACHINE ................................................................... 32
5-1. Hand lifter ..........................................................................................................................................32
5-2. Resetting the safety clutch ..............................................................................................................33
5-3. Adjusting the automatic presser foot lifter ..................................................................................... 34
5-4. Fixing the feed adjusting dial ...........................................................................................................35
5-5. How to change the maximum stitch length (LU-2818-7, LU-2868-7) ............................................37
5-6. Normal-/reverse-feed stitch needle entry points alignment at the time of automatic reverse
feed stitching (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) .......................................................38
5-7. Operation switches (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7) ............................................. 39
5-8. Knee switch .......................................................................................................................................41
5-9. Function setting for the SC-922 (LU-2818-7, LU-2868-7) ............................................................... 44
6. SEWING SPEED TABLE ............................................................................................... 45
7. MOTOR PULLEY AND V-BELT (LU-2810, LU-2860) ...................................................45
8. TROUBLES IN SEWING AND CORRECTIVE MEASURES ......................................... 46
i
1. SPECIFICATIONS
No. Item Application
1 Model LU-2810 LU-2860
2 Model name 1-needle, unison-feed, lockstitch
machine
2-needle, unison-feed, lockstitch
machine
3 Application Medium- to heavy-weight materials, car seat, furniture
4 Sewing speed Max. 3,000 sti/min
"6. SEWING SPEED TABLE"
(See
p.45
.)
(See
Max. 2,700 sti/min
"6. SEWING SPEED TABLE"
p.45
.)
5 Needle GROZ-BECKERT 135 x 17 (Nm 125 to Nm 180) (Standard : Nm 160)
6 Applicable thread size for sewing #30 to #5
7 Stitch length Max. 9 mm (forward/reverse feed)
8 Stitch length dial 1-pitch dial
9 Presser foot lift Hand lifter : 10 mm
By knee lifter : 20 mm
10 Stitch length adjusting
By dial
mechanism
11 Reverse stitch adjusting method By lever
12 Thread take-up Link thread take-up
13 Needle bar stroke 40 mm
14 Amount of the alternate vertical
1 mm to 9 mm (Alternate vertical dial adjustment type)
movement
15 Hook Full-rotary vertical-axis 2-fold hook (Latch type)
16 Feed mechanism Box feed
17 Top and bottom feed actuation
Timing belt
mechanism
18 Lubrication Automatic lubrication by oil tank (with oil gauge)
19 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7)
or JUKI MACHINE OIL No. 7
20 Bed size 643 mm × 178 mm
21 Space under the arm 347 mm × 127 mm
22 Hand wheel size Effective diameter of the V belt section : ø76.0 mm Outer diameter : ø140 mm
23 Motor/Control box M51N 750W / SC-922A
24 Machine head weight 56 kg 61 kg
25 Noise - Equivalent continuous emission sound
pressure level (LpA) at the workstation:
A-weighted value of 83.0 dB; (Includes
pA
K
= 2.5 dB); according to ISO 10821C.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 10821C.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
pA
K
= 2.5 dB); according to ISO 10821C.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 10821C.6.2 - ISO 3744 GR2 at 2,700 sti/min.
– 1 –
No. Item Application
1 Model LU-2810-7 LU-2860-7
2 Model name 1-needle, unison-feed, lockstitch
machine with automatic thread trimmer
2-needle, unison-feed, lockstitch
machine with automatic thread trimmer
3 Application Medium- to heavy-weight materials, car seat, furniture
4 Sewing speed Max. 3,000 sti/min
"6. SEWING SPEED TABLE"
(See
p.45
*1
.)
(See
Max. 2,700 sti/min
"6. SEWING SPEED TABLE"
p.45
*1
.)
5 Needle GROZ-BECKERT 135 x 17 (Nm 125 to Nm 180) (Standard : Nm 160)
6 Applicable thread size for sewing #30 to #5
7 Applicable thread size to be cut #30 to #5
8 Stitch length Max. 9 mm (forward/reverse feed)
9 Stitch length dial 2-pitch dial
10 Presser foot lift Hand lifter : 10 mm
Automatic presser foot lifter : 20 mm
11 Stitch length adjusting
By dial
mechanism
12 Reverse stitch adjusting method Air cylinder type (with touch-back switch)
13 Thread take-up Link thread take-up
14 Needle bar stroke 40 mm
15 Amount of the alternate vertical
1 mm to 9 mm (Alternate vertical dial adjustment type)
movement
16 Hook Full-rotary vertical-axis 2-fold hook (Latch type)
17 Feed mechanism Box feed
18 Top and bottom feed actuation
Timing belt
mechanism
19 Thread trimming method Cam-driven scissors type
20 Lubrication Automatic lubrication by oil tank (with oil gauge)
21 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7)
or JUKI MACHINE OIL No. 7
22 Bed size 643 mm × 178 mm
23 Space under the arm 347 mm × 127 mm
24 Hand wheel size Outer diameter : ø123 mm
25 Motor/Control box SC-922B
26 Machine head weight 61 kg 66 kg
27 Rated power consumption 180VA 110VA
28 Noise - Equivalent continuous emission sound
pressure level (LpA) at the workstation:
A-weighted value of 83.0 dB; (Includes
pA
K
= 2.5 dB); according to ISO 10821C.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 10821C.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
pA
K
= 2.5 dB); according to ISO 10821C.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 10821C.6.2 - ISO 3744 GR2 at 2,700 sti/min.
*1 The speed setting according to the amount of the alternating vertical movement of the walking foot and presser
foot is automatically carried out.
– 2 –
No. Item Application
1 Model LU-2818-7 LU-2868-7
2 Model name 1-needle, unison-feed, lockstitch
machine with automatic thread trimmer
(with 2.7-fold vertical axis hook/long
pitch type)
2-needle, unison-feed, lockstitch
machine with automatic thread trimmer
(with 2.7-fold vertical axis hook/long
pitch type)
3 Application Medium- to heavy-weight materials, car seat, furniture
4 Sewing speed Max. 3,000 sti/min
"6. SEWING SPEED TABLE"
(See
p.45
*1
.)
(See
Max. 2,700 sti/min
"6. SEWING SPEED TABLE"
p.45
*1
.)
5 Needle GROZ-BECKERT 135 x 17 (Nm 125 to Nm 180) (Standard : Nm 160)
6 Applicable thread size for sewing #30 to #5
7 Applicable thread size to be cut #30 to #5
8 Stitch length Max. 12 mm (forward/reverse feed)
9 Stitch length dial 2-pitch dial
10 Presser foot lift Hand lifter : 10 mm
Automatic presser foot lifter : 20 mm
11 Stitch length adjusting
By dial
mechanism
12 Reverse stitch adjusting method Air cylinder type (with touch-back switch)
13 Thread take-up Link thread take-up
14 Needle bar stroke 40 mm
15 Amount of the alternate vertical
1 mm to 9 mm (Alternate vertical dial adjustment type)
movement
16 Hook Full-rotary vertical-axis 2.7-fold hook (Latch type)
17 Feed mechanism Box feed
18 Top and bottom feed actuation
Timing belt
mechanism
19 Thread trimming method Cam-driven scissors type
20 Lubrication Automatic lubrication by oil tank (with oil gauge)
21 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7)
or JUKI MACHINE OIL No. 7
22 Bed size 643 mm × 178 mm
23 Space under the arm 347 mm × 127 mm
24 Hand wheel size Outer diameter : ø123 mm
25 Motor/Control box SC-922B
26 Machine head weight 66 kg 68.5 kg
27 Rated power consumption 120 VA 110 VA
28 Noise - Equivalent continuous emission sound
pressure level (LpA) at the workstation:
A-weighted value of 84.0 dB; (Includes
pA
K
= 2.5 dB); according to ISO 10821C.6.2 - ISO 11204 GR2 at 2,750 sti/
min.
- Sound power level (LWA);
A-weighted value of 84.0 dB; (Includes
KWA = 2.5 dB); according to ISO 10821C.6.2 - ISO 3744 GR2 at 3,000 sti/min.
- Equivalent continuous emission sound
pressure level (LpA) at the workstation:
A-weighted value of 84.0 dB; (Includes
pA
K
= 2.5 dB); according to ISO 10821C.6.2 - ISO 11204 GR2 at 2,600 sti/
min.
- Sound power level (LWA);
A-weighted value of 84.0 dB; (Includes
KWA = 2.5 dB); according to ISO 10821C.6.2 - ISO 3744 GR2 at 2,700 sti/min.
*1 The speed setting according to the amount of the alternating vertical movement of the walking foot and presser
foot is automatically carried out.
– 3 –
2. INSTALLATION
2-1. Installation of the sewing machine
1) To prevent possible accidents caused by the full
of the sewing machine, perform the work by two
persons or more when the machine is moved.
Do not hold the pulley and the reverse feed
lever.
2) Do not put protruding articles such as the
screwdriver and the like at the location where
the sewing machine is placed.
❸
❷
Sheet B
❺
Sheet C
❹
❶
Sheet A
❹
25 mm
❺
❺
❸
19 mm
3) Attaching the hinge seats and the support rubbers of the machine head
Place sheets A and B (standard: three pieces)
and C (standard: one piece) between hinge seat
and machine head support rubbers ❷ and ❸.
❶
Then, x them on the table with nail.
Use nail ❺ for sheet C. Use nail ❹ for other
sheets.
There are two different machine head support
rubbers ❸; i.e., the rubber for the right and that
for the left. Be sure to check the types of the
support rubbers before xing them.
Sheets A and B (eight pieces each) and
sheets C (four pieces) are supplied with the
machine as accessories.
For the sheets A and B, three sheets are
to be used as standard for each mounting
position. For the sheet C, one sheet is to be
used as standard. (The state shown in the
left gure)
The sheets A, B and C are used for adjusting the height of the top surface of the bed.
Use one more sheet to increase the height,
or use only one sheet to decrease it.
– 4 –
Be sure to use a short nail ❺ for sheet C. If
long nail ❹ is used, the nail tip can penetrate the table giving rise to a risk of injury.
Operator’s side
❺
Align
Table
Align
4) Attaching the oil pan
Fix the oil pan ❺ supplied with the machine on
the table by tightening ten wood screws.
Top surface
Multi-layered part
❻
5) Attach a lter ❻ to the oil pan ❺ as shown in
the gure.
Install lter ❻ so that its multi-layered part is
brought to the right side as observed from you.
❼
❺
6) Install hinge ❼ on the bed with screw ❽. En-
gage the hinge with the rubber hinge of the
table. Then, place the machine head on the
machine head support rubber.
❽
– 5 –
❾
❺
7) Securely attach head support rod ❾ until its rib
is closely pressed against the table.
When it is really necessary to conduct work
with the machine head supporting rod removed for the purpose of maintenance and
repair, it is necessary to carry out the work
with two or more persons.
In the case the machine head is tilted more
than necessary, oil can leak from the oil inlet of the oil tank. It is, therefore, necessary
to remove oil from the oil tank before tilting
the machine head.
8) Put reux pipe in the oil reservoir A of oil
pan ❺. Secure the pipe in groove .
9) Fix lter and lter clamp with tting .
A
10) Mount spacers supplied with the machine
head on the frame.
11) Install bracket on CP panel with screws
supplied with the panel.
12) Install bracket on spacer with screws
supplied with the machine head and washers
supplied with the panel.
Do not use the screws supplied the panel
instead of screws supplied with the machine head.
* Accessory screw supplied with the machine
head: Thread diameter M5; Length: 8 mm
– 6 –
2-2. Installing the belt cover and the belt (LU-2810, LU-2860)
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) Put the V-belt on the sewing machine pulley.
❷
V-belt
❶
2) Install belt cover ❶ on the machine arm.
3) Install belt cover B ❷ on the table.
4) Mount the handle section of the pulley with a
screw.
When the sewing machine is used, covers
and ❷ must be installed without fail.
❶
2-3. Adjusting the belt tension (LU-2810, LU-2860)
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 belt tension with the height of the motor
so that the belt sags 15 mm when the center of V
15mm
9.8N
Handwheel
Motor pulley
belt is applied with a 9.8 N load.
– 7 –
2-4. Installing the oil shield
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, LU-2810-7, LU-2818-7
❶
❷
LU-2860, LU-2860-7, LU-2868-7
❶
❷
❷
Install oil shield ❶, supplied with the unit, on the
frame with screws ❷.
2-5. Pneumatic components (LU-2810-7, LU-2860-7, LU-2818-7, LU-2868-7)
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.
(1) Installing the regulator
❷
❼
❸
❽
❺
❻
❹
❶
1) Install regulator (asm.) ❶ on mounting plate
with screw ❷, spring washer ❸ and nut ❹
❺
which are supplied with the unit.
2) Install couplings ❻ and ❼ on regulator ❶.
3) Attach mounting plate ❺ on the undersurface of
the table with accessory screws ❽ supplied with
the plate.
4) Connect ø6 air tube coming from the sewing
machine to coupling ❻.
– 8 –
Decrease Increase
❶
A
❷
(2) Adjusting the air pressure
1) The operating air pressure is 0.5 to 0.55 MPa.
Adjust the air pressure using air pressure regu-
lating knob ❶ of the lter regulator.
2) In the case uid accumulation is observed in A
section of the lter regulator, turn drain cock ❷
to drain the uid.
(3) Exhaust tube
Pass ø8 exhaust tube ❶ coming from the sew-
ing machine through hole ❷ in the table.
In the case of high humidity, water may ow out
from the exhaust tube.
❷
❶
– 9 –
2-6. Installing the thread stand
LU-2810, LU-2810-7,
LU-2818-7
Assemble the thread stand, set it up on the machine
table using the installation hole in the table and tight-
en nut ❶ gently.
❶
LU-2860, LU-2860-7,
LU-2868-7
❶
– 10 –
2-7. Installing the thread guide pin
LU-2810, LU-2810-7, LU-2818-7
❷
LU-2860, LU-2860-7, LU-2868-7
❷
❶
❶
Insert needle thread guide pin ❶ into the corresponding hole in top cover ❷.
LU-2810, LU-2810-7, LU-2818-7:
・
One needle thread guide pin
LU-2860, LU-2860-7, LU-2868-7:
・
Two needle thread guide pins
– 11 –
3. PREPARATION OF THE SEWING MACHINE
3-1. Lubrication
WARNING :
1. Do not connect the power plug until the lubrication has been completed so as to prevent accidents
due to abrupt start of the sewing machine.
2. To prevent the occurrence of an inammation or rash, immediately wash the related portions if oil
adheres to your eyes or other parts of your body.
3. If oil is mistakenly swallowed, diarrhea or vomitting may occur. Put oil in a place where children
cannot reach.
LU-2810, LU-2810-7
LU-2860, LU-2860-7
❶
LU-2818-7, LU-2868-7
C
C
❷
A
B
■ Lubrication procedure
Fill the oil tank with oil before operating the sewing
machine.
1) Fill the oil tank with JUKI NEW DEFRIX OIL
No.1 (Part No. : MDFRX1600C0) or JUKI MA-
CHINE OIL #7 (Part No. : MML007600CA) using
the oiler supplied with the machine from section
.
C
2) Fill the oil tank with the oil until the top end of
oil amount indicating rod ❷ comes between the
upper engraved marker line A and the lower
engraved marker line B of oil amount indicating
window ❶.
If the oil is lled excessively, it will leak from the
air vent hole in the oil tank or proper lubrication
will be not performed. In addition, when the oil
is vigorously lled, it may overow from the oil
hole. So, be careful.
3) When you operate the sewing machine, rell
oil if the top end of oil amount indicating rod ❷
comes down to the lower engraved marker line
of oil amount indicating window ❶.
B
1. When using a new sewing machine for the rst time or using the sewing machine which has not
been used for a long time, run in the sewing machine at a sewing speed of 1,000 sti/min or less and
check the oil quantity in the hook before use.
If the quantity of oil in the hook is insufcient, adjust the quantity of oil by turning the oil quantity
adjusting screw counterclockwise to ensure that the oil quantity in the hook is adequate. After that,
adjust the quantity of oil to the adequate one. (Refer to "■ Adjusting the oil quantity in the hook" p.13.)
2. For the oil for hook lubrication, purchase JUKI NEW DEFRIX OIL No. 1 (Part No. : MDFRX1600C0) or
JUKI MACHINE OIL #7 (Part No. : MML007600CA).
3. Be sure to lubricate clean oil.
– 12 –
❷
❸
❶
❺
❹
■ Cleaning the oil lter
1) Loosen fastening plate ❶ on the back-ow side.
Remove oil lter joint (asm.) ❷ on the back-ow
side.
2) Clean up lters ❸, ❹ and ❺ and oil reservoir
of the oil pan.
❻
Be sure to clean up the oil reservoir of the
oil pan and the lter case approximately
once a month.
If the lter is clogged with soil, lubrication
fails resulting in trouble.
A sheet of
paper
❻
■ Adjusting the oil quantity in the hook
LU-2810, LU-2810-7, LU-2818-7
1) Remove rubber cap❶.
2) Loosen nut ❷ and turn oil amount adjustment
screw ❸ to adjust the amount of oil in the hook.
Turning the screw clockwise A will decrease the
amount of oil in the hook or counterclockwise B
will increase it.
3) The appropriate amount of oil, when a sheet of
paper is placed near the periphery of the hook,
❷
❸
❶
is to such an extent that splashes of oil from the
hook appear in approximately ve seconds as
A
B
❹
shown in the gure on the left.
In the case the oil quantity in the hook cannot be adjusted to the proper quantity, it
should be adjusted by loosening nut ❹ and
turning oil quantity adjusting screw ❺. The
oil quantity in the hook is increased by turning the oil quantity adjusting screw counterclockwise C, or is decreased by turning it
clockwise D.
Also check to be sure that the oil is fed to the
hook at the sewing speed of 1,000 sti/min.
❺
D
C
– 13 –
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