WO2009080373A1 - Industrial robot with magnetic safety coupling - Google Patents
Industrial robot with magnetic safety coupling Download PDFInfo
- Publication number
- WO2009080373A1 WO2009080373A1 PCT/EP2008/054671 EP2008054671W WO2009080373A1 WO 2009080373 A1 WO2009080373 A1 WO 2009080373A1 EP 2008054671 W EP2008054671 W EP 2008054671W WO 2009080373 A1 WO2009080373 A1 WO 2009080373A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- industrial robot
- coupling
- robot according
- arm section
- magnet
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
- B25J—MANIPULATORS; CHAMBERS PROVIDED WITH MANIPULATION DEVICES
- B25J19/00—Accessories fitted to manipulators, e.g. for monitoring, for viewing; Safety devices combined with or specially adapted for use in connection with manipulators
- B25J19/06—Safety devices
- B25J19/063—Safety devices working only upon contact with an outside object
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
- H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
- H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
- H02K49/108—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element with an axial air gap
Definitions
- the present invention relates to an industrial robot with at least one arm section mechanically connected to a robot body and a safety coupling between at least the distal part of the arm section and the robot body.
- a tool may be attached to a robot arm by means of a magnetic coupling. Examples thereof can be found in US 5 954446, US 6 847 188 and DE 1 993 8114.
- these couplings do not contribute to safety against injures resulting from a collision with the robot arm, or damages to the robot arm since they are only for attaching the tool to the arm.
- a further drawback with mechanical safety couplings based on springs is that it requires many components and is complex to assemble.
- the object of the present invention is to improve the safety coupling connecting an arm section or a part thereof to the robot base.
- terms like “axial” and “perpendicular” refer to the longitudinal axis of the arm section in question.
- distal is meant the direction in the robot towards the tool end of the arm and with “proximal” is meant the opposite direction, i.e. towards the robot body.
- distal and proximal refer to the location in relation to the robot body. "Proximal” thus means closer to the robot base and “distal” means closer to the tool.
- an industrial robot of the kind initially specified includes the specific feature that the safety coupling is a magnetic coupling.
- Providing a magnetic safety coupling either between the arm section and the rotor body or integrated in the arm section results in a reliable safety on a high level with an uncomplicated device.
- the magnetic coupling will have very few components in comparison with a spring coupling. Thereby its assembly as well as its maintenance will be easy. The accuracy over time can be maintained and the risk for failure due to wear and the like is at minimum.
- the magnetic coupling is arranged between a distal part of the arm section and a proximal part pf the arm section.
- the coupling can protect against both perpendicular and axial collisions.
- the distal and proximal parts are aligned with each other, the coupling includes a first end face on the distal part and a second end face on the proximal part, the first and second end faces being in parallel and abutting each other.
- At least one magnet is mounted on at least one of the end faces and the opposing end face has at least one portion made of a material that is attracted to a magnet, each magnet being aligned with such a portion.
- the design thereby will be very simple and straight-forward and, and the behaviour of the coupling in case of collision can be easy to foresee and calculate.
- the said portion is a magnet.
- At least one of said magnets or at least one of said portions is axially adjustable.
- the axial attraction force can easily be adapted to what is required.
- the risk for having a too high attraction force, which might be hazardous or having a too low attraction force, which might cause trouble is thereby reduced.
- At least one of the magnets is axially adjustable.
- the distance between the magnets or between the magnet and the magnetic material can be varied in order to adjust the breakaway threshold of the coupling.
- the magnet has an annular shape.
- the coupling further includes mechanical retainer means.
- This embodiment has the advantage that the distal end of the arm section is prevented from falling down upon disconnecting. Particularly advantageous is to use a spring as retainer means. Thereby the disconnected part will automatically return to its connected position following disconnection.
- the two end faces have mechanical guide means arranged to cooperate with each other.
- Such guide means ensure in a simple fashion that the two halves of the arm section are held in alignment with each other.
- the guide means also facilitates restoring to correct position after breakage.
- the guide means includes at least one axial projection on one of the end faces and a matching depression on the other end face for each projection.
- each projection advantageously is spherical in shape. Thereby the coupling can disconnect under a torsional overload condition.
- the number of projections is two (three) or more.
- At least one of the end faces is provided with a proximity sensor arranged to sense the distance to the other end face.
- the end surfaces form an acute angle with the longitudinal axis of the arm section.
- the angle is in the range of 30° to 60°, most preferably in the range of 40° to 50°.
- the magnetic coupling is arranged between an arm section and the rotor body.
- This embodiment will result in complete disconnection of the arm section in the event of a collision, which for some applications might be desirable due to safety considerations.
- the magnetic coupling is arranged to transmit torque from a joint motor to a joint.
- each magnet is a neodymium magnet.
- a neodymium magnet is many times stronger than other magnets. The magnets therefore can be made smaller which saves costs and weight.
- Fig. 1 is a perspective view of a robot arm according to the invention.
- Fig. 2 is a perspective view of the robot arm in fig. 1 illustrating a first collision type.
- Fig. 3 is a perspective view of the robot arm in fig. 1 illustrating a second collision type.
- Fig. 4 is a perspective view of an arm section of the robot in fig. 1.
- Fig. 5 is a side view of the arm section in fig. 4.
- Fig. 6 is a side view of an arm section according to another alternative.
- Fig. 7 is an enlargement of detail of fig. 4.
- Fig. 8 is a view corresponding to that of fig. 7 illustrating another example.
- Fig. 9 is an axial section through the detail of fig. 8.
- Fig. 10 is a perspective view of parts of a still further example of the invention.
- Fig. 11 is a perspective view of a still further example of the invention.
- Figs 12-15 are a kinematic coupling.
- a robot arm 1 is connected to a robot body 2 through a first joint 3.
- the robot arm 1 in this example consists of a proximal arm section 1a and a distal arm section 1 b connected to each other via a second joint 4.
- the distal end of the distal arm section is arranged for attachment of a tool.
- Each arm section 1a, 1b is provided with a breakable safety coupling 5 through which each arm section is separated into a proximal part 101a, 101b and a distal part 102a, 102b.
- a collision occurs against the arm e.g. at the distal end thereof, the force from the collision will break one of the couplings, provided that the collision force exceeds a predetermined threshold. If the collision force is mainly perpendicular to the longitudal axis of the distal arm section 1b as illustrated in fig. 2 the safety coupling 5 on the distal arm section 1b will break and separate the proximal part 101 b and the distal part 102b of this arm section 1 b from each other.
- the safety coupling 5 on the proximal arm section 1a will be accordingly activated.
- Each of the safety couplings 5 is magnetic i.e. the parts of the arm section are hold together by magnetic force.
- the distal arm section 1 b is illustrated in a state when the safety coupling 5 disconnects the proximal 101b and distal 102b parts of the arm section 1 b.
- the two parts 101b, 102b however are held together by a spring 9 acting as a retainer.
- the safety coupling 5 is further illustrated in a side view in fig. 5.
- the coupling plane of the safety coupling 5 in fig. 5 is perpendicular to the longitudinal axis of the arm section 1b.
- the coupling plane can be angled as illustrated in fig. 6.
- the safety coupling will be activated in respond to both axial and perpendicular collision forces.
- fig. 7 the coupling of fig. 4 is illustrated in an enlarged scale.
- the pairs of magnets have opposite magnetic polarity such that the pairs of magnets provide the coupling force.
- the two parts of the arm section are held in coaxial alignment by two locating pegs 8 on the end face 6 of the distal arm part 102b.These pegs 8 mate with recesses (non-visible) on the opposite end face.
- a central coil spring 9 provides an additional coupling force between the two parts of the arm section.
- the purpose of the spring 9 is to provide a restoring force such that the two arm parts automatically snap back into alignment following disconnection of the magnets.
- An inductive proximity sensor 10 is mounted on the end face 10. In the event of collision, the sensor 10 registers disconnection of the coupling and sends a signal to the control system of the robot, which then disconnects power to the drive motors.
- the magnet force is established by one single tubular-shaped magnet 11 located in the centre of the end surface 6. The magnet 11 cooperates with a matching tubular magnet (not visible) on the opposed end surface.
- a spring 9 is provided as a retainer and is located within the tubular-shaped magnets 11.
- the guidance for axial alignment in this example is accomplished by two balls 12 mounted on the end face 6. Corresponding spherical depressions are provided on the opposite end face. A proximity sensor 10 is provided also in this example.
- both the cooperating magnets 11 , 11 b can be seen.
- the magnet in the right coupling half is mounted within a tubular housing 13, the distal surface being threaded.
- the housing 13 is screwed into a hole 14 in the end face 6 of the arm part 102b.
- the axial position of the magnet 11 thereby can be adjusted and thereby the distance between the two magnets 11 , 11 b when connected. By this arrangement the attraction force between the magnets can be adjusted and therewith the breakaway threshold of the coupling.
- a lock nut is arranged to fix the axial position of the magnet 11.
- the other magnet 11b is non-adjustably fixed into the other part of the coupling. It is to be understood that the magnets 7 in the example illustrated in fig. 7 of course also can be mounted axially adjustable.
- the magnets also fulfil the function as guiding means.
- three pairs of magnets cooperate.
- On the end face 6 three socket shaped magnets 16 are mounted.
- On the other end face three ball shaped magnets 17 are mounted which match the socket shaped magnets 16.
- the ball and socket arrangement provides the guiding function in addition to the magnetic attraction.
- Figure 11 illustrates an example where the safety coupling is arranged between a joint motor 18 and a joint 19 of an arm section 20.
- the safety coupling in this example is similar to the one illustrated in fig. 7 having magnets 7 and sensor 10 on the end surface 6 and a retainer spring 9.
- the guide means in this example however is similar to that of fig. 8 i.e. is formed by balls 12.
- the safety coupling in fig. 11 is capable of reacting upon collision forces on the arm section 20 in the longitudinal direction of the arm section 20, perpendicular thereto and in the rotational direction.
Abstract
The present invention relates to an industrial robot with at least one arm section mechanically connected to a robot body. A safety coupling (5) is provided between at least the distal part (102b) of the arm section and the rotor body. According to the invention the safety coupling (5) is a magnetic coupling.
Description
17.04.2008
INDUSTRIAL ROBOT WITH MAGNETIC SAFETY COUPLING
Field of invention
The present invention relates to an industrial robot with at least one arm section mechanically connected to a robot body and a safety coupling between at least the distal part of the arm section and the robot body.
Background of the invention
To obtain intrinsic safety in a robot it is necessary to limit the effective inertia transferred to a human in case of a collision. To reduce the impedance of a robot it can be made light weight. This alone does not guarantee collision safety if the robot operates a high (human level) speed due to the fact that the major part of the impedance, in case of a collision, will come from the motor and gearbox inertia, if a high reduction ratio gearbox is used. To resolve this problem it is proposed that a spring decoupling device be introduced between the gearbox output and robot arm. This leads to a low stiffness and bandwidth of the robot arm. Another proposed solution is to use a "safety clutch" device in the robot joint. A safety clutch is stiff up to a specified threshold torque, above which it becomes loose.
Recently it has been proposed to use a spring based safety link mechanism. Such a device has the benefit of absorbing shock from a multitude of directions, reducing the numbers of safety devices needed in the robot. A drawback of the proposed mechanism is that it requires many components and is complex to assemble.
To enhance safety, a tool may be attached to a robot arm by means of a magnetic coupling. Examples thereof can be found in US 5 954446, US 6 847 188 and DE 1 993 8114. However, these couplings do not contribute to safety against injures resulting from a collision with the robot arm, or damages to the robot arm since they are only for attaching the tool to the arm.
A further drawback with mechanical safety couplings based on springs is that it requires many components and is complex to assemble.
The object of the present invention is to improve the safety coupling connecting an arm section or a part thereof to the robot base. In the present application terms like "axial" and "perpendicular" refer to the longitudinal axis of the arm section in question. With "distal" is meant the direction in the robot towards the tool end of the arm and with "proximal" is meant the opposite direction, i.e. towards the robot body.
The terms "distal" and "proximal" refer to the location in relation to the robot body. "Proximal" thus means closer to the robot base and "distal" means closer to the tool.
Summary of the invention
The object of the present invention is achieved in that an industrial robot of the kind initially specified includes the specific feature that the safety coupling is a magnetic coupling.
Providing a magnetic safety coupling either between the arm section and the rotor body or integrated in the arm section results in a reliable safety on a high level with an uncomplicated device. The magnetic coupling will have very few components in comparison with a spring coupling. Thereby its assembly as well as its maintenance will be easy. The accuracy over time can be maintained and the risk for failure due to wear and the like is at minimum.
According to a preferred embodiment of the invention the magnetic coupling is arranged between a distal part of the arm section and a proximal part pf the arm section.
By this arrangement the safety coupling will be integrated with the arm section and constructional complexity is decreased in relation to locating the magnetic coupling at the gear output or at a joint. Another advantage is that the coupling can protect against both perpendicular and axial collisions. According to a further preferred embodiment the distal and proximal parts are aligned with each other, the coupling includes a first end face on the distal part and a second end face on the proximal part, the first and second end faces being in parallel and abutting each other. At least one magnet is mounted on at least one of the end faces and the opposing end face has at least one portion made of a
material that is attracted to a magnet, each magnet being aligned with such a portion.
The design thereby will be very simple and straight-forward and, and the behaviour of the coupling in case of collision can be easy to foresee and calculate. According to a further preferred embodiment the said portion is a magnet.
Having two pair-wise cooperating magnets will increase the attraction force in comparison with one magnet cooperating with a material that is not a magnet but is magnetic. Of course the poles have to be accordingly directed. A higher attraction force might in some cases be required without increasing the size of the coupling.
According to a further preferred embodiment at least one of said magnets or at least one of said portions is axially adjustable.
Thereby the axial attraction force can easily be adapted to what is required. The risk for having a too high attraction force, which might be hazardous or having a too low attraction force, which might cause trouble is thereby reduced.
According to a further preferred embodiment at least one of the magnets is axially adjustable.
Thereby the distance between the magnets or between the magnet and the magnetic material can be varied in order to adjust the breakaway threshold of the coupling.
According to a further preferred embodiment the magnet has an annular shape.
Thereby the magnetic force is even and symmetric around the axis which assures that the breakaway threshold will be uniform in all directions. According to a further preferred embodiment the coupling further includes mechanical retainer means.
This embodiment has the advantage that the distal end of the arm section is prevented from falling down upon disconnecting. Particularly advantageous is to use a spring as retainer means. Thereby the disconnected part will automatically return to its connected position following disconnection.
According to a further preferred embodiment the two end faces have mechanical guide means arranged to cooperate with each other.
Such guide means ensure in a simple fashion that the two halves of the arm section are held in alignment with each other. The guide means also facilitates restoring to correct position after breakage.
According to a further preferred embodiment the guide means includes at least one axial projection on one of the end faces and a matching depression on the other end face for each projection.
This embodiment represents a very simple way to realize the guide means, which also is precise and safe. Each projection advantageously is spherical in shape. Thereby the coupling can disconnect under a torsional overload condition. Preferably the number of projections is two (three) or more.
According to a further preferred embodiment at least one of the end faces is provided with a proximity sensor arranged to sense the distance to the other end face.
Thereby disconnection of the coupling can be registered in the event of a collision and a signal can be sent to the control system for disconnecting power to the motors. This enhances the safety when a collision occurs.
According to a further preferred embodiment the end surfaces form an acute angle with the longitudinal axis of the arm section.
By angling the disconnect plane in this way the coupling will function even in case of an axial collision. Preferably the angle is in the range of 30° to 60°, most preferably in the range of 40° to 50°.
According to a further preferred embodiment the magnetic coupling is arranged between an arm section and the rotor body.
This embodiment will result in complete disconnection of the arm section in the event of a collision, which for some applications might be desirable due to safety considerations.
According to a further preferred embodiment the magnetic coupling is arranged to transmit torque from a joint motor to a joint.
Thereby an inexpensive and reliable "clutched" coupling between the joint motor and the joint itself is attained. This improves the safety regarding certain kinds of collisions.
According to a further preferred embodiment each magnet is a neodymium magnet.
A neodymium magnet is many times stronger than other magnets. The magnets therefore can be made smaller which saves costs and weight.
The above mentioned preferred embodiments of the invented robot are specified in the dependent claims. The invention will be further explained through the following detailed descriptions of advantageous examples of a robot according to the invention.
Brief description of drawings
Fig. 1 is a perspective view of a robot arm according to the invention. Fig. 2 is a perspective view of the robot arm in fig. 1 illustrating a first collision type.
Fig. 3 is a perspective view of the robot arm in fig. 1 illustrating a second collision type.
Fig. 4 is a perspective view of an arm section of the robot in fig. 1. Fig. 5 is a side view of the arm section in fig. 4.
Fig. 6 is a side view of an arm section according to another alternative.
Fig. 7 is an enlargement of detail of fig. 4.
Fig. 8 is a view corresponding to that of fig. 7 illustrating another example.
Fig. 9 is an axial section through the detail of fig. 8. Fig. 10 is a perspective view of parts of a still further example of the invention.
Fig. 11 is a perspective view of a still further example of the invention.
Figs 12-15 are a kinematic coupling.
Description of examples of the invention In fig. 1 a robot arm 1 is connected to a robot body 2 through a first joint 3.
The robot arm 1 in this example consists of a proximal arm section 1a and a distal arm section 1 b connected to each other via a second joint 4. The distal end of the distal arm section is arranged for attachment of a tool.
Each arm section 1a, 1b is provided with a breakable safety coupling 5 through which each arm section is separated into a proximal part 101a, 101b and a distal part 102a, 102b. When a collision occurs against the arm e.g. at the distal end thereof, the force from the collision will break one of the couplings, provided that the collision force exceeds a predetermined threshold. If the collision force is mainly perpendicular to the longitudal axis of the distal arm section 1b as
illustrated in fig. 2 the safety coupling 5 on the distal arm section 1b will break and separate the proximal part 101 b and the distal part 102b of this arm section 1 b from each other.
If the collision force is mainly axial as illustrated in fig. 3 the safety coupling 5 on the proximal arm section 1a will be accordingly activated.
Each of the safety couplings 5 is magnetic i.e. the parts of the arm section are hold together by magnetic force. In fig. 4 the distal arm section 1 b is illustrated in a state when the safety coupling 5 disconnects the proximal 101b and distal 102b parts of the arm section 1 b. The two parts 101b, 102b however are held together by a spring 9 acting as a retainer. The safety coupling 5 is further illustrated in a side view in fig. 5.
The coupling plane of the safety coupling 5 in fig. 5 is perpendicular to the longitudinal axis of the arm section 1b.
As an alternative the coupling plane can be angled as illustrated in fig. 6. Thereby the safety coupling will be activated in respond to both axial and perpendicular collision forces.
In fig. 7 the coupling of fig. 4 is illustrated in an enlarged scale. On the end face 6 of the distal arm part 102b a number of magnets 7 are mounted. Each magnet 7 is attracted to a counterpart magnet on the mating annular surface on the end face (not visible in the figure) of the proximal arm part 101 b. The pairs of magnets have opposite magnetic polarity such that the pairs of magnets provide the coupling force. The two parts of the arm section are held in coaxial alignment by two locating pegs 8 on the end face 6 of the distal arm part 102b.These pegs 8 mate with recesses (non-visible) on the opposite end face. A central coil spring 9 provides an additional coupling force between the two parts of the arm section. This force, however, is weak in comparison to that provided by the magnetic pairs. The purpose of the spring 9 is to provide a restoring force such that the two arm parts automatically snap back into alignment following disconnection of the magnets. An inductive proximity sensor 10 is mounted on the end face 10. In the event of collision, the sensor 10 registers disconnection of the coupling and sends a signal to the control system of the robot, which then disconnects power to the drive motors.
In the example depicted in fig. 8 the magnet force is established by one single tubular-shaped magnet 11 located in the centre of the end surface 6. The magnet 11 cooperates with a matching tubular magnet (not visible) on the opposed end surface. Also in this example a spring 9 is provided as a retainer and is located within the tubular-shaped magnets 11.
The guidance for axial alignment in this example is accomplished by two balls 12 mounted on the end face 6. Corresponding spherical depressions are provided on the opposite end face. A proximity sensor 10 is provided also in this example. In the axial section through the two coupling halves illustrated in fig. 9 both the cooperating magnets 11 , 11 b can be seen. The magnet in the right coupling half is mounted within a tubular housing 13, the distal surface being threaded. The housing 13 is screwed into a hole 14 in the end face 6 of the arm part 102b. The axial position of the magnet 11 thereby can be adjusted and thereby the distance between the two magnets 11 , 11 b when connected. By this arrangement the attraction force between the magnets can be adjusted and therewith the breakaway threshold of the coupling.
A lock nut is arranged to fix the axial position of the magnet 11. The other magnet 11b is non-adjustably fixed into the other part of the coupling. It is to be understood that the magnets 7 in the example illustrated in fig. 7 of course also can be mounted axially adjustable.
In the example illustrated in fig. 10 the magnets also fulfil the function as guiding means. In this example three pairs of magnets cooperate. On the end face 6 three socket shaped magnets 16 are mounted. On the other end face three ball shaped magnets 17 are mounted which match the socket shaped magnets 16. The ball and socket arrangement provides the guiding function in addition to the magnetic attraction.
Figure 11 illustrates an example where the safety coupling is arranged between a joint motor 18 and a joint 19 of an arm section 20. The safety coupling in this example is similar to the one illustrated in fig. 7 having magnets 7 and sensor 10 on the end surface 6 and a retainer spring 9. The guide means in this example however is similar to that of fig. 8 i.e. is formed by balls 12.
The safety coupling in fig. 11 is capable of reacting upon collision forces on the arm section 20 in the longitudinal direction of the arm section 20,
perpendicular thereto and in the rotational direction.
Claims
1. An industrial robot with at least one arm section (1 a, 1 b, 20) mechanically connected to a robot base (2) and a safety coupling between at least the distal part (102a, 102b) of the arm section (1 a, 1 b, 20) and the robot body (2), which arm section (1a, 1 b, 20) defines a longitudinal axis, characterized in that the safety coupling is a magnetic coupling (5).
2. An industrial robot according to claim 1 characterized in that the magnetic coupling (5) is arranged between a distal part (102a, 102b) of the arm section (1a, 1b) and a proximal part (101a, 101b) of the arm section (1a, 1b).
3. An industrial robot according to claim 2 characterized in that the distal part (102a, 102b) and proximal part (101a, 101 b) are aligned with each other, that the coupling (5) includes a first end face (6) on the distal part (102a, 102b) and a second end face on the proximal part (101a, 101b), the first (6) and second end faces being parallel and abutting each other, that at least one magnet (7, 11 , 16) is mounted on at least one of said end faces (6), and in that the opposing end face has at least one portion made of a material that is attracted by a magnet, each magnet (7, 11 ) being aligned with such a portion.
4. An industrial robot according to claim 3 characterized in that said portion is a magnet (11 b, 17).
5. An industrial robot according to claim 3 or 4 characterized in that at least one of said magnets (7, 11 , 16) or at least one of said portions is axially adjustable.
6. An industrial robot according to any of claims 3-5 characterized in that said magnet (11 ) has annular shape.
7. An industrial robot according to any of claims 1-6 characterized in that the coupling (5) further includes mechanical retainer means (9), preferably a spring.
8. An industrial robot according to any of claims 1 -7 characterized in that the two end faces (6) each have mechanical guide (8, 12) means arranged to cooperate with each other.
9. An industrial robot according to claim 8 characterized in that said guide means (8, 12) includes at least one axial projection (8, 12) on one of said end faces (6) and a matching depression on the other end face for each projection (8, 12), said projection (8, 12)preferably having a spherical shape (12).
10. An industrial robot according to any of claims 8-9 characterized in that at least one of the end faces (6) is provided with a proximity sensor (10) arranged to sense the distance to the other end face.
11 , An industrial robot according to any of claims 3-10 characterized in that said end faces (6) form an acute angle with the longitudinal axis of the arm section.
12. An industrial robot according to claim 1 characterized in that the magnetic coupling (5) is arranged between an arm section (20) and the rotor body.
13. An industrial robot according to claim 12 characterized in that the magnetic coupling (5) is arranged to transmit torque from a joint motor (18) to a joint (19).
14. An industrial robot according to any of claims 1-13 characterized in that each magnet (7, 11 , 16, 17) is a neodymium magnet.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US830407P | 2007-12-20 | 2007-12-20 | |
US61/008,304 | 2007-12-20 |
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WO2009080373A1 true WO2009080373A1 (en) | 2009-07-02 |
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PCT/EP2008/054671 WO2009080373A1 (en) | 2007-12-20 | 2008-04-17 | Industrial robot with magnetic safety coupling |
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US20090095109A1 (en) * | 2007-10-10 | 2009-04-16 | Osamu Mizuno | Structure, manipulator and structure control system |
WO2011029114A1 (en) * | 2009-09-10 | 2011-03-17 | Fronius International Gmbh | Collision protection device |
WO2012010332A1 (en) * | 2011-02-07 | 2012-01-26 | Abb Research Ltd | Industrial robot with a collapsible process force applicator |
WO2016032978A1 (en) * | 2014-08-25 | 2016-03-03 | Paul Ekas | Shock absorbing and self re-aligning robotic fingers |
WO2016140804A1 (en) | 2015-03-03 | 2016-09-09 | The Procter & Gamble Company | Safety device for a mechanical motion device |
DE102015218347A1 (en) | 2015-09-24 | 2017-03-30 | Kuka Systems Gmbh | Coupling device for coupling components |
US9718194B2 (en) | 2014-08-25 | 2017-08-01 | Paul Ekas | Robotic grippers including finger webbing for improved grasping |
US10086512B2 (en) | 2015-12-21 | 2018-10-02 | Robert Bosch Gmbh | Protection apparatus for a manipulation device on a handling device, as well as handling device |
DE102017211810A1 (en) * | 2017-07-11 | 2019-01-17 | Festo Ag & Co. Kg | gripping assembly |
DE102019201628A1 (en) * | 2019-02-08 | 2020-08-13 | Kuka Deutschland Gmbh | Robotic structural element |
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