JUKI MP-G20R-TH User manual

INDUSTRIAL SEWING MACHINE
MODEL
MP-G20R-TH
TECHNICAL MANUAL
Upper Thread-Holding Device
A181E020P01
Attachment

FOR SAFE USE
Before the installation, operation, and inspection for this product, read the “FOR SAFE USE” and the technical
manuals carefully. Also read the other technical manuals, “Sewing Machine Head”, “Control Unit” and
“Operation Panel” describing some instructions, which are not in this manual, and use the sewing machine
properly.
SAFETY INDICATIONS
CAUTION
Indicates that incorrect handling may cause hazardous conditions, resulting in
medium or slight personal injury or physical damage. Note that CAUTION level
may lead to a serious consequence according to the circumstances. Always
follow the instructions of both levels because they are important to personal
safety.
CAUTION INDICATIONS
No.
Caution indication
Description
1
Precaution for sewing machine operation:
Indicates that removing the safety and operating the sewing machine
for some other purposes with power-on are prohibited.
⚫Please do not operate the sewing machine without protective
equipment such as a needle guard, an eye guard, a belt cover
or the others.
⚫Please turn off the power switch when threading, changing a
needle and a bobbin, cleaning, and lubricating.
2
Caution for fingers injury:
Indicates a possibility of fingers (hands) injury in a certain condition.
3
Caution for squeezing fingers:
Indicates a possibility of squeezing fingers in a certain condition.

- 1 -
1. Features
Upper Thread-Holding Device will improve the
quality of the sewing start point. By gripping
the upper thread after thread trimming sewing
end, to prevent the thread fall out at the sewing
start point.
2. Applicable models
PLK-G2010R
PLK-G2516
PLK-G2516R
PLK-G2516-YU
PLK-G4030 / G4030R
PLK-G6030 / G6030R
PLK-G5050 / G5050R
PLK-G10050 / G10050R
3. Specifications
Upper thread holding stroke
：23mm
Control power supply
：DC24V
Drive source air pressure
Primary side
：0.5 MPa（5 kgf /cm2）or more
Secondary side
：0.4 MPa（4 kgf /cm2）
4. Configuration
The Fig. numbers in the drawing correspond to the part numbers given in the following explanations. When
ordering service parts, please specify in the Parts No. (M********).
Fig.1
Mounting example of
the upper thread holding mechanism
Trouble such as operation errors could occur if the secondary pressure is set too high.
Use within the range of 0.4 MPa (4 kgf /cm2).
CAUTION

- 2 -
4.1 Upper thread holding mechanism (Parts list)
Fig
部品コード
品名
Description
数量
No.
Parts No.
Amt. Req.
101
MB10H0429
ｻｻｴｲﾀ
Support plate
1
102
MB10H0751
ﾄﾘﾂｹﾌﾞﾛｯｸ
Installation block
1
103
M90859004
SW-PW ﾌﾟﾗﾏｲﾅﾍﾞﾈｼﾞ M3X6
Screw M3X6
3
104
MB10H0700
ﾎｼﾞﾊﾞﾈ
Holding spring
1
105
MB10H0477
ｽﾄｯﾊﾟ
Stopper
1
106
ML30A0181
ｲﾄｻﾊﾞｷ
Thread distributor
1
107
MA20A9571
ﾜﾝﾀｯﾁﾂｷﾞﾃ
One-touch coupling
2
108
ME25H0434
ｴｱｼﾘﾝﾀﾞ
Air cylinder
1
4.2 Pneumatic pressure control unit (Parts list)
Fig
部品コード
品名
Description
数量
No.
Parts No.
Amt. Req.
201
MB25S0599
ﾃﾞﾝｼﾞﾍﾞﾝｱｾﾝﾌﾞﾘ
Solenoid valve assy
1
202
MH10A8508
ｾﾂｿﾞｸﾃﾞﾝｾﾝｸﾐﾀﾃ
Cable assy
1
203
MB10K4567
ｴｱﾁｭｰﾌﾞｸﾐﾀﾃ
Air tube assy (A)
1
204
MB10K5567
ｴｱﾁｭｰﾌﾞｸﾐﾀﾃ
Air tube assy (B)
1
Fig.3
Pneumatic pressure control unit
107A
An example of a
mounting bracket
(Not included)
103
Fig.2
Upper thread holding
mechanism
108
107B
101
105
102
103
106
104

- 3 -
4.3 Accessories (Parts list)
Fig
部品コード
品名
Description
数量
No.
Parts No.
Amt. Req.
301
MG51A0201
ｹｯｿｸﾊﾞﾝﾄﾞ
Cable tie
6
5. Assembly procedures
5.1 Installing the upper thread holding mechanism
(1) Make a bracket for mounting the upper thread holding mechanism.
(Shows an example in Figure 2.)
★Please consult sewing machine shop for the fabrication of bracket.
The mounting of the upper thread holding mechanism, you can use the mounting holes of the wiper
mechanism, to or attached to the face cover. Attach a position that does not interfere with the holding jig
to position the sewing material, consider including the sewing pattern and workability.
(2) Remove the wiper mechanism from the machine arm. Is not only part of the wiper drive, please remove
the connection wires from the sewing machine.
★Can not be shared with the wiper mechanism and Upper Thread-Holding Device.
(3) Attach the upper thread holding mechanism to the machine arm. Please adjust the position of the upper
thread holding mechanism so that the thread distributor Fig.No.106 scoop a thread between the presser
foot and the needle, as shown in Figure 1.
5.2 Installing the pneumatic pressure control related parts and piping
Please connect the pipes so that the state of the air cylinder rod is returned when the power is turned off. If
the rod is advanced, please replace the pipe to the joint A and B of the solenoid valve after the removal of
the air pressure to stop the air.
(1) The 0 to the air pressure by turning the pressure adjustment
knob of the filter regulator, and remove any residual pressure.
(2) Remove the packing and C blanking plate D from the
solenoid valve as shown in Figure 4, and install a solenoid
valve attached. At this time, attach the packing included with
this in order to prevent air leakage.
(3) Insert to match the symbols A and B of the air tubes
"Fig.No.203 and 204" into the ports "Fig.No.107A and 107B" of
the upper thread holding mechanism.
(4) Insert to match the symbols A and B of the air tubes into the
ports "A and B" of the solenoid valve.
(5) Bind the air tubes appropriately with the enclosed Fig.No.301
Cable ties.
★To work in the presence of residual pressure in the pneumatic circuit It is dangerous. Please
work after you remove the residual pressure always. The method of removing the residual
pressure, and pull up the handle of the pressure regulating filter regulator, can be done by
turning counter-clockwise until the pressure gauge shows 0.
★When installing removal of parts, please go to turn off the power before. In addition, qualified
personnel of electrical work, please be performed by wiring work.
CAUTION
B
A
Fig.4

- 4 -
5.3 How to setup and cable connection
(1) Remove the circuit board cover on the back of the sewing machine.
(2) Disconnect the cable connector of the wiper connected to CON11 on the circuit board.
(3) Connect the connector of Fig.No.202 cable assy to CON11 on the circuit board.
(4) Connect the connector of sensor of the air cylinder to CON9 on the circuit board.
(5) Install the circuit board cover removed.
Output (CON 11)
Printed character
Signal
Pin No.
W
O2
Upper thread holding
1
-
-
2
+24V
DC24V
3
Input (CON 9)
Printed character
Signal
Pin No.
FSW
+12V
DC12V
1
I7
S6
(Thread trimming protection signal)
2
GND
Ground
3
5.4 How to setup and cable connection
(1) Press the on the standard screen to open the MENU mode.
(2) Press the in the menu icon. The Input/Output setting mode screen is displayed.
(3) Press the on the Input/Output setting mode, and enter a password.
Input Customize Setting screen, press the button on the lower side of the physical input RAM "I7".( Input
signal is displayed on the button, the default is "NO".) The Function Section screen will open.
(4) Select input signal "S6" by pressing the button .
(5) Press the and display the screen of the Detailed Setting.
(6) Change the "reversed" from the "normal" a logical setting by pressing the button ,
press the button .
(7) Press the .
(8) Press the and return to standard screen.
The settings will be changed to the table shown next by the above operation.
For details, refer to the clause [14] Input/output setting mode of the technical manual “Operation Panel”.
Please ask the dealer about a password.
DETAILED
SETTING
USUAL

- 5 -
Default value
After changing the setting
Input signal
NO
S6
Signal name
--
Thread trimming protection signal
Logical setting
normal
reversed
6. Operation
(1) Pull up on the handle of the filter regulator, adjust to 0.4MPa(4kgf/cm2) air pressure by turning in a
clockwise direction.
(2) Upper Thread-Holding Device will work in the program of the wiper.
For the timing adjustment of the operation, refer to the clause of the technical manual “Control Unit”.
7. Upper thread holding mechanism outline drawing
Assembly of this device is completed, please check your work once again.
Because there is a case to unexpected behavior, please away from the sewing machine when the
power is turned on and the air pressure.
CAUTION
2-M4 Internal thread
23str

MEMO

MEMO

Printed in Japan