JUKI PLC-2760NVM User manual

PLC-2760NVM
INSTRUCTION MANUAL

ii
CONTENTS
1. Specications ................................................................................................................. 1
2. Threading the machine head......................................................................................... 2
3. Take-up thread guide ..................................................................................................... 3
4. Pneumatic components (when the pneumatic center guide is used) ....................... 4
5. Setting the incidental device......................................................................................... 6
5-1. Setting the ON/OFF status of the center guide ................................................... 6
5-2. Setting the optional input for the the center guide............................................. 8
5-3. Setting the optional output for the center guide ................................................ 9
6. Adjusting the hook needle guard................................................................................ 10
7. Adjusting the bobbin case opening lever .................................................................. 10
8. Adjusting the timing of the opener ............................................................................. 11
9. How to correct the main shaft reference angle ......................................................... 12
10. Position of the thread trimmer cam.......................................................................... 14
11. Adjusting the position of the moving knife.............................................................. 15
12. Adjusting the position of the clamp spring ............................................................. 16
13. How to adjust the cam timing.................................................................................... 17
13-1. Timing of the vertical feed cam ........................................................................ 17
13-2. Top feed cam timing .......................................................................................... 18
14. Needle sway (Adjusting the bottom feed amount).................................................. 20
15. Tension correction ..................................................................................................... 21
15-1. Tension correction and sewing speed ............................................................. 22
15-2. Tension correction and remaining amount of bobbin thread ........................ 23
16. Thread clamp device.................................................................................................. 25
16-1. How to install the thread clamp device............................................................ 25
16-2. How to set up the thread clamp device............................................................ 28
16-3. How to set the thread clamp operation while the presser foot is in its upper
position....................................................................................................................31
17. How to replace the hook cover ................................................................................. 32
18. How to install the oil lter.......................................................................................... 34
19. Counter function......................................................................................................... 35
19-1. Displaying the sewing screen under the counter display mode ................... 35
19-2. Types of the counter .......................................................................................... 35
19-3. How to set the counter ...................................................................................... 36
19-4. How to reset the count-completion state......................................................... 40
CAUTION
This Instruction Manual for the PLC-2760NVM only describes their differences from the
standard models (PLC-2760V).
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 –
1. Specications
PLC-2760NVMA70BBZ
No. Item Application
1 Model PLC-2760NVM
2 Model name 2-needle, post-bed, unison-feed, lockstitch machine with vertical-axis hook
3 Application Medium- to heavy-weight materials, car seat, furniture
4 Sewing speed Max. 2,500 sti/min
(Refer to "10. SEWING SPEED TABLE" in the Instruction Manual for the standard
model.)
5 Needle Ferd. SCHMETZ 134 - 35 (Nm 100 to Nm 180) (Standard : Nm 140)
6 Applicable thread size for sewing #30 to #5 (Europe 60 / 3-20 / 3)
7 Applicable thread size to be cut #30 to #5 (Europe 60 / 3-20 / 3)
8 Stitch length Max. 12 mm (forward/reverse feed)
However, the machine is shipped with its stitch length restricted to 7 mm.
9 Presser foot lift 20 mm
10 Presser foot pressure control Electric control (driven by a pulse motor)
11 Horizontal feed control Electric control (driven by a pulse motor)
12 Alternate vertical feed control Electric control (driven by a pulse motor)
13 Reverse stitch adjusting method Pulse motor driving (with touch-back switch)
14 Number of patterns Sewing pattern ............................ 99 patterns (For the polygonal shape sewing, as
many as 10 patterns can be registered.)
Cycle sewing pattern ................... 9 patterns
Custom-pitch pattern ................... 20 patterns
Condensation custom pattern ..... 9 patterns
15 Thread take-up Link thread take-up
16 Needle bar stroke 40 mm
17 Amount of the alternate vertical
movement
MAX. 9 mm
However, the machine is shipped with its stitch length restricted to 6.5 mm.
18 Needle thread tension Electric control (driven by a solenoid)
19 Hook Vertical-axis 1.6-fold hook (Latch type)
20 Feed mechanism Box feed
21 Drive system/Top and bottom
vertical axis drive
Main shaft direct drive system/Timing belt
22 Lubrication Automatic lubrication by semi-dry head plunger pump (with oil gauge)
23 Lubricating oil JUKI New Defrix Oil No. 1 (equivalent to ISO standard VG7)
or JUKI MACHINE OIL No. 7
24 Bed size 643 mm × 178 mm
25 Space under the arm 347 mm × 298 mm
26 Hand wheel size Outer diameter : ø123 mm
27 Motor/Control box DD motor : 800W AC servomotor
Control box : SC-952
28 Machine head weight 88 kg
29 Rated power consumption 600 VA
30 Noise - Equivalent continuous emission sound pressure level (LpA) at the
workstation:
A-weighted value of 83.5 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 90.5 dB; (Includes KWA = 2.5 dB); according to ISO
10821- C.6.2 - ISO 3744 GR2 at 2,500 sti/min.

– 2 –
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 o󰀨 and ascertaining that the motor is at rest.
2. Threading the machine head
Thread the machine head following the order as
illustrated in the gure.
󱀄
󱀁
󱀅
󱀂
󰿿
󱢳
󱀇
󱢴
󱢶
󱀃
󱢵
󱀀
󰿿
󱀀
󱀅
󱀂
󱀄
󱀂
󱀃󱀃
󱀅
󱀄
󱀇
󱢷
󱀆
󱀆
󱢸
Left-hand
needle thread Right-hand
needle thread
󱢸
󱢶
󱢷
󱀇

– 3 –
3. Take-up thread guide
If you want to change the feed amount of thread fed
from the thread take-up lever, loosen the setscrew of
take-up thread guide 󱀀and move take-up thread guide
󱀀appropriately.
Move the take-up thread guide in direction Ato de-
crease the thread feed amount.
Move the take-up thread guide in direction Bto in-
crease the thread feed amount.
* Standard position of the take-up thread guide
The position where take-up thread guide 󱀀is at its
lower end while the setscrew is fitted in the upper
tapped hole (󱤪) in the thread guide mounting plate 󰿿
(See the gure on the left.)
If you want to move the take-up thread guide in direc-
tion Bfrom its standard position, insert the setscrew of
take-up thread guide 󱀀into the lower tapped hole (󱤫)
in thread guide mounting plate 󰿿.
󰿿


󱤫
󱤪
󱀀
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 o󰀨 and ascertaining that the motor is at rest.

– 4 –
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 o󰀨 and ascertaining that the motor is at rest.
(1) Installing the regulator
1) Install regulator (asm.) 󰿿on mounting plate 󱀃
with screw 󱀀, spring washer 󱀁and nut 󱀂which
are supplied with the unit.
2) Attach joint 󱀄to inlet 1. Attach joint 󱀅to outlet
2.
3) Attach mounting plate 󱀃on the undersurface of
the table with accessory screws 󱀆supplied with
the plate.
4) Connect the ø6 air tube to joint 󱀅.
* Screw 󱀀which is supplied with the unit:
Thread diameter M5; Length: 12 mm
(SM6051202TP)
(2) Adjusting the air pressure
1) The operating air pressure is 0.5 to 0.55 MPa.
Adjust the air pressure using air pressure regulat-
ing knob 󰿿 of the lter regulator.
2) In the case uid accumulation is observed in 󱤨
section of the lter regulator, turn drain cock 󱀀to
drain the uid.
Decrease Increase
󰿿
󱀀
󱤨
󱀀
󰿿
󱀃
󱀅
󱀄
󱀂
󱀁
󱀆
1
2
4. Pneumatic components (when the pneumatic center guide is used)

– 5 –
󱀁
󱀂
󰿿
󱀀
󱀃
2ø4 tube
(3) Attaching the solenoid valve
1) Attach solenoid valve asm. 󱀀to the under-
surface of the table with accessory screw 󰿿
(SK3452001SE).
2) Connect the ø6 tube described in step 4) in "(1)
Installing the regulator" to joint 󱀁.
Cut the ø6 tube to an appropriate length before
use.
3) Connect the ø4 air tube coming from the air type
center guide to joint 󱀂.
4) Connect connector 󱀃to the CN59 on the electrical
control box.

– 6 –
5. Setting the incidental device
5-1. Setting the ON/OFF status of the center guide
󰿿
1) 󰿿held pressed for three second.
The "mode screen" is displayed.
2) Select "14. Incidental device setting".
3) The "Incidental device setting screen" is dis-
played.
When the device setting of which is to be
changed is selected, the setting screen for the
selected device is displayed.
4) Select "1. Center guide" to display the "Center
guide setting screen".
<Incidental device setting screen>
5) Select "H001 Function ON/OFF" to display the
"Center guide function ON/OFF setting screen".
<Center guide setting screen>

– 7 –
󱀀
󱀂
󱀄
<Center guide ON/OFF setting screen>
󱀁
󱀃
6) Select ON/OFF status of the function.
7) Press 󱀀to conrm the setting.
8) Press 󱀁to display the sewing data
edit screen.
9) Press 󱀂to display the "S056 center
guide".
10) Then, set the ON/OFF status of the center
guide.
11) Press 󱀃 to conrm the value you have
entered.
12) Press 󱀄to display the sewing screen.
If the pneumatic center guide does not function just by setting its ON/OFF status, set the optional in-
put/output of the center guide as described in the next paragraph to enable the function of the pneu-
matic center guide.

– 8 –
󰿿
5-2. Setting the optional input for the the center guide
Assign the switching function of the center guide to the 6-gang switch.
1) 󰿿held pressed for three second.
The "mode screen" is displayed.
2) Select "19. Optional I/O setting".
3) Select "1. Optional input setting".
4) Select "INPUT6. Thread clamp switch input".