Kitagawa NPGT User manual

INSTRUCTION
MANUAL
MODEL NPGT
Thin 2-jaw Parallel 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
MA1289YHG1
Version1.01(20200715)

1
Preface
This manual provides detailed information on the thin 2-jaw parallel gripper (model NPGT)
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 7
3. Specifications 11
3-1.Specification table
3-2.Gripping force
4. Use 14
5. Design of Jaws 15
5-1. Designing jaws to be installed on the gripper
6. Installation 16
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 22
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:
NPGT 08 S
* For the gripper equipped with the length measuring sensor, see also the separately
provided instruction manual for it.
1-2. Structural drawing
1-3. Seal list
No.
Model
202
203
204
205
209
NPGT08
X-ring X013
X-ring X136
O-ring S55
Seal washer 6S1
-
NPGT10
X-ring X014
X-ring X146
O-ring S71
Seal washer 6S1
O-ring S11.2
Series
Size
Length measuring
sensor
NPGT
NBR seal
08
10
Nil
Not equipped
S
Equipped
Master jaw
Plunger
Body
Rear cover
Piston
Cover

5
1-4. Parts list
NPGT08
No.
Parts name
Quantity
No.
Parts name
Quantity
1
Body
1
200
Plunger fixing bolt
2
2
Rear cover
1
201
Cover fixing bolt
4
3
Plunger L（R）
1（1）
202
Shaft packing
2
4
Cover
1
203
Piston packing
1
5
Master jaw L（R）
1（1）
204
O-ring
1
6
Piston
1
205
Seal washer
2
206
Positioning bushing
4
207
Setscrew
8
208
Rear cover fixing bolt
4
204
4
5
202
201
6
203
1
3
207
206
205
200
208
2

6
NPGT10
No.
Parts name
Quantity
No.
Parts name
Quantity
1
Body
1
200
Plunger fixing bolt
2
2
Rear cover
1
201
Cover fixing bolt
4
3
Plunger L（R）
1（1）
202
Shaft packing
2
4
Cover
1
203
Piston packing
1
5
Master jaw L（R）
1（1）
204
O-ring
1
6
Piston
1
205
Seal washer
2
7
Pipe
1
206
Positioning bushing
4
207
Setscrew
8
208
Rear cover fixing bolt
4
209
O-ring
1
204
2
6
205
200
4
5
202
201
203
1
3
207
206
7
209
208

7
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

8
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 workpiece 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.
Other than plunger fixing bolt Plunger fixing bolt
Bolt
size
Tightening
torque
Bolt
size
Tightening
torque
M3
1.0
N･m
M5
6.8
N･m
M4
2.0
N･m
M6
12.7
N･m
M5
4.5
N･m
M8
33.3
N･m
M6
7.65
N･m
M8
18.0
N･m