Kitagawa NPG3 User manual

INSTRUCTION
MANUAL
MODEL NPG3
3-jaw Shield Gripper
・This Instruction Manual has been prepared for intended use for
production engineers and maintenance persons who operate this
product. When the beginners use this product, be sure to receive the
guidance from skilled persons, sales agents, or us in advance.
・Before installing, using, or maintaining this product, read carefully the
safety precautions given in this manual so as to understand them
completely. If you do not heed given instructions or safety
precautions, serious human accidents, death, or physical damage
may occur.
・Store this manual with care in the specified place at hand, and reread
it as necessary for correct use of the product.
・Please contact the sales agent if you have any uncertainty or doubt
about this manual.
DANGER
MA1381YHG2
Version1.02(20221226)

1
Preface
This manual provides detailed information on the 3-jaw shield gripper (model NPG3) so that
you can understand its performance and functions and use it safely and correctly.
Before using this gripper, read this manual carefully to understand how to use the gripper
correctly. Always follow the instructions and warnings given in “Important Safety
Precautions” and “Precautions for Use”. Failure to follow these precautions could result
in serious human accidents.
Terms and Symbols Used for Safety
Messages
In this manual, handling precautions that are considered especially important are classified
and displayed as shown below according to the degree of risk (seriousness of harm) that
could result. Please completely understand the meaning of these terms and follow the
instructions for safe operation.
Safety Alert Symbol
This triangle is a safety alert symbol used to alert you to potential safety hazards. To avoid
death or injuries that could occur, follow the safety messages given with this safety alert
symbol.
Failure to follow the safety precautions below will result
in death or serious injuries.
Failure to follow the safety precautions below could
result in death or serious injuries.
Failure to follow the safety precautions below may result
in minor or moderate injuries.
Indicates instructions which, if you do not heed given
instructions, could result in damage to the product or
shortened service life, or damage to peripheral
equipment.

2
Disclaimer and How to Use Instruction
Manual
This product is suitable for gripping a conveyed workpiece by being installed on the robot or
loader. The product is equipped with the jaws to grip the conveyed workpiece and they are
operated by air pressure. For any other applications, please contact us.
Kitagawa Corporation shall not be held liable for human accidents, death, damage, or loss
that occurred due to a failure to follow the safety precautions given in this manual.
This manual does not predict all potential hazards in operation, inspection, and
maintenance under all environmental conditions. There will be an infinite number of matters
that cannot or must not be done, and it is impossible for the manual to cover all of them.
Therefore, the matters, unless otherwise mentioned clearly as “can be done” or “may be
done” in this manual, should be considered as “cannot be done” or “must not be done”.
Please contact us or our agents if you have an uncertainty about safety when you try to
perform operation, inspection, or maintenance not mentioned in this manual.
Warranty and Disclaimer
The product is warranted for one year after the date of delivery.
All parts used shall be those delivered by Kitagawa Corporation. Kitagawa Corporation
shall not be held liable for human accidents, death, damage, or loss that occurred due to
the use of parts which are not genuine parts manufactured by Kitagawa. Also, the use of
parts other than Kitagawa’s genuine parts will void the warranty.

3
Contents
1. Structural Drawing and Parts List 4
1-1.Model indication
1-2.Structural drawing
1-3.Seal list
1-4.Parts list
2. Important Safety Precautions 6
3. Specifications 10
3-1.Specification table
3-2.Gripping force
4. Use 13
5. Design of Jaws 14
5-1. Designing jaws to be installed on the gripper
6. Installation 15
6-1.Installing the gripper
6-2.Installing the jaws
6-3. Connecting the air piping
6-4.Installing the switches
7. Maintenance and Checking 20
7-1.Periodic checking
7-2.Maintenance interval
7-3.Grease
7-4. Disassembly and assembly procedure
8. Troubleshooting 25
8-1.Problems and countermeasures
8-2.Contact address in case of trouble
9. Others 26
9-1.Standards and directives to which the gripper conforms
9-2.Disposal of gripper

4
1. Structural Drawing and Parts List
1-1. Model indication
The model indication is as follows:
NPG3 10
1-2. Structural drawing
1-3. Seal list
No.
型式
206
207
208
209
210
NPG310
O-ring SS5
O-ring S75
X-ring X126
X-ring X232
Seal washer 10S1
Series
Size
NPG3
NBR Seal
10
Master jaw
Plunger
Cover Seal
Rear cover
Piston
Cover
Body

5
１-４．Parts List
No.
部品名称
個数
No.
部品名称
個数
1
Body
1
202
Cover fixing bolt
6
2
Rear cover
1
203
Rear cover fixing bolt
3
3
Master jaw
3
204
Set screw
2
4
Plunger
1
205
Spring pin
1
5
Piston
1
206
O-ring Ａ
2
6
Cover
1
207
O-ring Ｂ
1
7
Cover seal
1
208
Jaw packing
3
8
Positioning bushing
12
209
Piston packing
1
210
Seal washer
1
201
Piston fixing bolt
1
211
Seal cap bolt
3
202
6
7
1
8
211
3
4
5
201
2
208
206
205
209
210
207
204
203
203
NPG310

6
2. Important Safety Precautions
Important safety precautions that particularly you should know or follow are summarized
below. Please read them before starting to use the product.
DANGER
Failure to follow the safety precautions below will result
in death or serious injuries.
Be sure to turn off the main power supply when installing, checking,
oiling, or replacing the gripper.
Also, shut down the air pressure in the work area.
●During work, the robot or gripper
could move abruptly and collide
with your body.
●After shutting down the air
pressure, release the air
pressure remaining inside the
gripper.
When installing, checking, oiling, or replacing the gripper, post a sign or
notice, or provide a fence, and so on to notify people around the machine
that work is in progress.
●Notify people around the machine that work is in progress and take measures to keep
people other than the operator out of the work area.
Machine motion not predicted by a third party could cause serious danger.
Take safety measures so that the operator is not injured even if the
conveyed workpiece flies out due to the reduced air pressure.
●Observe the legal safety
standards defined by each
country, such as installation of
safeguards or fall prevention
covers.
！
Main power
OFF
Air pressure
Close

7
DANGER
Failure to follow the safety precautions below will result
in death or serious injuries.
Do not modify the gripper.
●Not only the gripper is
damaged but also the
gripper and fixed workpiece
may fly out.
If using the gripper as a workpiece fixture when the workpiece is drilled,
deburred, welded, or modified additionally, confirm the specifications.
●If the gripper is used out of
the specifications, not only
the gripper is damaged but
also the fixed workpiece may
fly out.
Be sure to tighten the bolts with the specified torque.
●Lack of bolt quantity or
tightening torque, or
excessive torque could
damage the bolt, causing the
gripper or conveyed work
piece to fly out.
●When tightening the bolts, fix
the gripper so that it will not
rotate. Failure to do so may
result in injury by slipping
your hands when tightening
the bolts.
Gripper body fixing bolt
Boltsize
Tightening torque
M5
5.5
N･m
M6
10.8
N･m
M8
26.5
N･m
Piston fixing bolt
Boltsize
Tightening torque
M6
10.8
N･m
M8
26.5
N･m
Cover fixing bolt
Boltsize
Tightening torque
M4
2
N･m
M5
3.5
N･m
Rear body fixing bolt
Boltsize
Tightening torque
M5
4.8
N･m
M6
8.6
N･m

8
DANGER
Failure to follow the safety precautions below will result
in death or serious injuries.
Use the gripper in accordance with the legal safety standards.
●Use the gripper in accordance
with the legal safety standards
defined by each country, such as
installation of safeguards or
safety covers.