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