JUKI PLC-2700 Series User manual

PLC-2700 Series
INSTRUCTION MANUAL

i
CONTENTS
1. SPECIFICATIONS......................................................................................................... 1
2. INSTALLATION............................................................................................................. 4
2-1. Installation of the sewing machine................................................................................................4
2-2. Adjusting the belt tension (PLC-2710, 2760, 2760L, 2765) ..........................................................6
2-3. Pneumatic components..................................................................................................................7
2-4. Attaching the belt cover (PLC-2710, 2760, 2760L, 2765) .............................................................9
2-5. Installing the thread stand ........................................................................................................... 10
2-6. Installing the thread guide pin.....................................................................................................10
3. PREPARATION OF THE SEWING MACHINE .......................................................... 11
3-1. How to set the model of the machine head ................................................................................ 11
3-2. Adjusting the machine head (PLC-2710-7, 2760-7).......................................................................... 13
3-3. Installing the detector (PLC-2710, 2760, 2760L, 2765; when the option kit is used) .............. 15
3-4. Opening/closing the hook cover.................................................................................................. 17
3-5. Lubrication.....................................................................................................................................17
3-6. Attaching the needle.....................................................................................................................20
3-7. Attaching and removing the bobbin............................................................................................ 21
3-8. Threading the hook.......................................................................................................................22
3-9. Winding a bobbin..........................................................................................................................23
3-10. Threading the machine head ..................................................................................................... 24
4. ADJUSTING THE SEWING MACHINE ..................................................................... 27
4-1. Adjusting the stitch length...........................................................................................................27
4-2. Thread tension .............................................................................................................................. 28
4-3. Thread take-up spring .................................................................................................................. 29
4-4. Needle-to-hook relation................................................................................................................30
4-5. Adjusting the hook needle guard ................................................................................................31
4-6. Adjusting the bobbin case opening lever...................................................................................31
4-7. Position of the counter knife and adjustment of the knife pressure........................................ 32
4-8. Adjusting the pressure of the presser foot ................................................................................32
4-9. Adjusting the amount of the alternating vertical movement of the walking foot and the press-
er foot .................................................................................................................................................... 33
5. OPERATION OF THE SEWING MACHINE................................................................ 34
5-1. Hand lifter ...................................................................................................................................... 34
5-2. Resetting the safety clutch .......................................................................................................... 34
5-3. Fixing the feed adjusting dial.......................................................................................................35
5-4. Normal-/reverse-feed stitch needle entry points alignment at the time of automatic re-
verse feed stitching ..................................................................................................................... 36
5-5. Operation switches (PLC-2710-7, 2760-7)...................................................................................37
5-6. Organized split needle bar (PLC-2765) ....................................................................................... 39
5-7. Knee switch (PLC-2710-7, 2760-7)...............................................................................................40
6. SEWING SPEED TABLE ............................................................................................ 43
7. MOTOR PULLEY AND V-BELT.................................................................................. 43
8. TROUBLES IN SEWING AND CORRECTIVE MEASURES...................................... 44

– 1 –
1. SPECIFICATIONS
No. Item Application
1 Model PLC-2710 PLC-2760
2 Model name Post-bed, 1-needle, unison-feed,
lockstitch machine with vertical-axis
large Hook
Post-bed, 2-needle, unison-feed,
lockstitch machine with vertical-axis
large Hook
3 Application Medium- to heavy-weight materials, car seat, furniture
4 Sewing speed Max. 2,500 sti/min
(See "6. SEWING SPEED TABLE" p.43.)
5 Needle GROZ-BECKERT 135 x 17 (Nm 100 to Nm 180) (Standard : Nm 140)
6 Applicable thread size for
sewing
#30 to #5
7 Applicable thread size to
be cut
8 Stitch length Max. 12 mm (forward/reverse feed)
9 Stitch length dial 1-pitch dial
10 Presser foot lift Hand lifter : 10 mm
Knee lifter : 20 mm
11 Stitch length adjusting
mechanism
By dial
12 Reverse stitch adjusting
method
By lever
13 Thread take-up Link thread take-up
14 Needle bar stroke 40 mm
15 Amount of the alternate
vertical movement
1 mm to 9 mm (Alternate vertical dial adjustment type)
16 Hook Vertical-axis 2-fold hook (Latch type)
17 Feed mechanism Box feed
18 Top and bottom feed
actuation mechanism
Timing belt
19 Thread trimming method
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 × 298 mm
24 Hand wheel size V-belt effective diameter : ø76.0 mm
Outer diameter : ø140 mm
25 Motor/Control box M51N 750W / SC-922A
26 Machine head weight 76 kg 79 kg
27 Noise - Equivalent continuous emission
sound pressure level (LpA) at the
workstation:
A-weighted value of 79.5 dB;
(Includes KpA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 11204 GR2
at 2,500 sti/min.
-Equivalent continuous emission
sound pressure level (LpA) at the
workstation:
A-weighted value of 84.0 dB;
(Includes KpA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 11204 GR2
at 2,500 sti/min.
-Sound power level (LWA);
A-weighted value of 86.0 dB;
(Includes KWA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 3744 GR2 at
2,500 sti/min.

– 2 –
No. Item Application
1 Model PLC-2710-7 PLC-2760-7
2 Model name Post-bed, 1-needle, unison-feed,
lockstitch machine with vertical-axis
large hook, with thread trimmer
Post-bed, 2-needle, unison-feed,
lockstitch machine with vertical-axis
large hook, with thread trimmer
3 Application Medium- to heavy-weight materials, car seat, furniture
4 Sewing speed Max. 2,500 sti/min
(See "6. SEWING SPEED TABLE" p.43.) *1
5 Needle GROZ-BECKERT 135 x 17 (Nm 100 to Nm 180) (Standard : Nm 140)
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
mechanism
By dial
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 movement
1 mm to 9 mm (Alternate vertical dial adjustment type)
16 Hook Vertical-axis 2-fold hook (Latch type)
17 Feed mechanism Box feed
18 Top and bottom feed
actuation mechanism
Timing belt
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 × 298 mm
24 Hand wheel size Outer diameter : ø123 mm
25 Motor/Control box SC-922B
26 Machine head weight 81 kg 84 kg
27 Rated power consumption 193VA
28 Noise -Equivalent continuous emission
sound pressure level (LpA) at the
workstation:
A-weighted value of 79.5 dB;
(Includes KpA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 11204 GR2
at 2,500 sti/min.
-Equivalent continuous emission
sound pressure level (LpA) at the
workstation:
A-weighted value of 84.0 dB;
(Includes KpA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 11204 GR2
at 2,500 sti/min.
-Sound power level (LWA);
A-weighted value of 86.0 dB;
(Includes KWA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 3744 GR2 at
2,500 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 –
No. Item Application
1 Model PLC-2760L PLC-2765
2 Model name Post-bed, 2-needle, unison-feed,
lockstitch machine (for thick thread)
Post-bed, 2-needle, unison-feed,
lockstitch machine with an organized
split needle bar
3 Application Heavy-weight materials, car seat,
furniture
Medium-to heavy-weight materials,
car seat, furniture
4 Sewing speed Max. 2,000 sti/min
(See "6. SEWING SPEED TABLE" p.43.)
Max. 2,500 sti/min
(See "6. SEWING SPEED TABLE" p.43.)
5 Needle GROZ-BECKERT 135 x 17
(Nm 140 to Nm 200)
(Standard : Nm 200)
GROZ-BECKERT 135 x 17
(Nm 100 to Nm 180)
(Standard : Nm 140)
6 Applicable thread size for
sewing #8 to #0 #30 to #5
7 Applicable thread size to
be cut
8 Stitch length Max. 12 mm (forward/reverse feed)
9 Stitch length dial 1-pitch dial
10 Presser foot lift Hand lifter : 10 mm
Knee lifter : 20 mm
Hand lifter : 10 mm
Knee lifter : 18 mm
11 Stitch length adjusting
mechanism
By dial
12 Reverse stitch adjusting
method
By lever
13 Thread take-up Link thread take-up
14 Needle bar stroke 40 mm 36 mm
15 Amount of the alternate
vertical movement
1 mm to 9 mm
(Alternate vertical dial adjustment type)
16 Hook Vertical-axis 2-fold hook (Latch type) Vertical-axis 2-fold hook (Cap type)
17 Feed mechanism Box feed
18 Top and bottom feed
actuation mechanism
Timing belt
19 Thread trimming method
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 × 298 mm
24 Hand wheel size V-belt effective diameter : ø76.0 mm
Outer diameter : ø140 mm
25 Motor/Control box M51N 750W / SC-922A
26 Machine head weight 79 kg 80 kg
27 Noise -Equivalent continuous emission
sound pressure level (LpA) at the
workstation:
A-weighted value of 88.0 dB;
(Includes KpA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 11204 GR2
at 2,000 sti/min.
-Sound power level (LWA);
A-weighted value of 93.5 dB;
(Includes KWA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 3744 GR2 at
2,000 sti/min.
-Equivalent continuous emission
sound pressure level (LpA) at the
workstation:
A-weighted value of 90.0 dB;
(Includes KpA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 11204 GR2
at 2,000 sti/min.
-Sound power level (LWA);
A-weighted value of 96.0 dB;
(Includes KWA = 2.5 dB); according to
ISO 10821- C.6.2 - ISO 3744 GR2 at
2,500 sti/min.

– 4 –
2. INSTALLATION
1) Carry the sewing machine with two persons.
In the case of the sewing machine with a thread
trimmer, loosen post cover mounting screws 󰿿
(three locations) to remove them. Remove post
cover 󱀀. Then, carry the sewing machine by
holding motor cover 󱀁.
2) Do not put protruding articles such as the screw-
driver and the like at the location where the sewing
machine is placed.
3) Attaching the hinge seats and the support rubbers
of the machine head
Fix hinge seat 󱀂and machine head support
rubber 󱀃which are supplied with the unit on the
table with nails 󱀄 as illustrated in the gure.
4) Attaching the oil pan
Fix the oil pan 󱀅supplied with the machine on
the table 󱀆by tightening eight wood screws.
Do not hold the handwheel.
Operator’s
side
Align
Align
2-1. Installation of the sewing machine
󰿿
󱀁
󱀀
󱀂
󱀃
󱀄
󱀆
󱀅

– 5 –
7) Securely attach head support rod 󱢵to the table until it goes no further.
8) Fix hinge stopper 󱢶with screws 󱢷. At this time, be sure to adjust so that the end face of hinge 󱢳is spaced
45 mm from the end face of hinge stopper 󱢶.
6) Install hinge 󱢳on the bed with screw 󱢴. Engage
the hinge with the rubber hinge of the table. Then,
place the machine head on the machine head
support rubber.
5) Attach a lter 󱀇to the oil pan 󱀅as shown in the
gure.
Install lter 󱀇so that its multi-layered part is
brought to the right side as observed from you.
󱢳
󱢴
󱢵
󱢷
󱢶
45
󱢳
󱢶
Chamfered section
Chamfered
section
Multi-layered part
󱀅
󱀇
Top surface

– 6 –
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.
Do not use the screws supplied the panel
instead of screws 󱣁supplied with the
machine head.
9) Put reux pipe 󱢸in the oil reservoir of oil pan 󱀅.
Secure the pipe in groove 󱢹.
10) Fix lter 󱢺 and lter clamp 󱢻 with tting 󱢼.
11) Mount spacers 󱢽supplied with the machine head
on the frame.
12) Install bracket 󱢿on CP panel 󱢾with screws 󱣀
supplied with the panel.
13) Install bracket 󱢿on spacer 󱢽with screws 󱣁
supplied with the machine head and washers 󱣂 
supplied with the panel.
2-2. Adjusting the belt tension (PLC-2710, 2760, 2760L, 2765)
󱀅
󱢸
󱢺
󱢻
󱢼
󱢾
󱣂
󱢿
󱣁
󱢽
󱣀
󱢹

– 7 –
(1) Installing the regulator
1) Install regulator (asm.) 󰿿on mounting plate 󱀃
with screw 󱀀, spring washer 󱀁and nut 󱀂which
are supplied with the unit.
2) Install couplings 󱀄and 󱀅on regulator 󰿿.
3) Install mounting plate 󱀃on the underside of the
table.
4) Connect 6 air tube coming from the sewing
machine to coupling 󱀄.
(3) Installing the solenoid valve (PLC-2710, 2760, 2760L, 2765)
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.
(2) Adjusting the air pressure
The operating air pressure is 0.5 to 0.55 MPa.
Adjust the air pressure using air pressure regu-
lating knob 󱀆 of the lter regulator.
Attach the solenoid valve (asm.) to the underside of the table with wood screws 󱀇supplied with the ma-
chine.
(4) Piping of the solenoid valve (PLC-2710, 2760, 2760L, 2765 AK type and AK/BT/DL type)
Connect the regulator and the solenoid valve by means of an air hose. (󱤨- 󱤨)
Connect exhaust tube (ø8) to the exhaust port of the solenoid valve.
In the case of high humidity, water may come out from the connected tube.
󱀀
󰿿
󱀃
󱀄
󱀅
󱀂
󱀁
󱀆
󱤨
Decrease Increase
(AK type)
󱤨
Exhaust port
󱀇
(AK/BT/DL type)
󱀇
Exhaust port
󱤨
2-3. Pneumatic components

– 8 –
(5) Piping of the air (PLC-2710, 2760, 2760L, 2765)
Connect the air hose coming from the machine head to the position shown above while matching the
number of the air hose and the number of the port.
(AK type) (AK/BT/DL type)
CN151 CN152 CN153
AK (wire mark 󰴭)AK (wire mark 󰴭)
(6) Routing the air hose and cable (PLC-2710, 2760, 2760L, 2765)
DL (wire mark 󰴩)
BT (wire mark 󰴫)
Pass the air hose and cable 󰿿through air-cable hole
󱀀to route them under the table.
󱀀
󰿿