JPH04269193A - Industrial robot - Google Patents

Abstract

PURPOSE:To prevent wiring and piping from generating an excessive torsion by providing a 1st pipe having flexibility, whose one end is connected onto a fixing jig fitted to a base body and whose other end is connected onto a 2nd arm. CONSTITUTION:A fixing jig 52 fitted to a base body 12, a 1st pipe 66 having flexibility whose one end is connected onto this fixing jig 52 and whose other end is connected onto a 2nd arm 16 and a 2nd pipe 86 having flexibility whose one end is connected onto the 2nd arm 16 and whose other end is connected onto a 3rd arm 18, are provided. Moreover the bundle 24 of wiring/piping for executing the feed of a control signal and the feed of a motion medium to a finger means 20, whose one end is connected to a control means 38, whose other end is connected to the finger means 20 by passing through the 1st pipe 66, 2nd pipe 86 and 3rd arm 18, is provided.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial robot, such as a horizontal articulated robot, in which the wiring and piping system in the robot body is improved.

0002

[Prior Art] Conventionally, as a wiring/piping system for horizontal articulated robots, for example, Japanese Patent Laid-Open No. 62-68788
It is known from Japanese Patent Publication No. 63-500505, and specifically, the former is configured as shown in FIG.
The latter is also shown in FIG. Furthermore, a conventional technique as shown in FIG. 6 is also known.

Specifically, the wiring/piping mechanism in the prior art shown in FIG. 4 is connected from a relay box a through a first pipe b to a rear part of a first arm c, is connected to the second arm e through the pipe d of It is connected to the finger h attached to the lower end of g.

On the other hand, the wiring in the prior art shown in FIG.
A piping mechanism is connected from the base i through the first pipe b to the second arm e, and from there is attached to the tip of the second arm e to drive the vertical arm j vertically and rotationally. through a second pipe d, and finally to a finger h attached to the lower end of the vertical arm j.

Further, the wiring/piping means in the prior art shown in FIG. 6 is connected from a relay box a to a fixing jig m placed on a first arm c through a first pipe b. , further, from this fixing jig m, through a second pipe d, connected to the upper end of a hollow vertical arm j, passing through this vertical arm j, to a finger h attached to the lower end of this vertical arm j. It is connected.

[0006]

[Problems to be Solved by the Invention] However, in the conventional example shown in FIG. 4, as the finger h rotates, a bundle of wiring and piping may become entangled with the finger h. If the number of wires in the bundle is large,
It is virtually impossible to prevent these wires from becoming entangled with the fingers h. In addition, a bundle of wiring and piping is
After the vertical moving table g is connected to the second arm e through the third pipe f, and the second arm e is connected to the first arm c through the second pipe d, Since it is connected to the relay box a through one pipe b, a total of three pipes b, d, and f are required. In this way, a problem has been pointed out that causes an increase in costs, including processing costs for wiring/piping connections, jigs, etc. for fixing pipes.

[0007] Furthermore, when the first arm c rotates, the first
and second pipes b and d may interfere with each other,
The connection positions of the second and third pipes d and f to the second arm e are far away from the rotation center of the second arm e, and when the second arm e rotates, the second It has been pointed out that the distance between the nuts e1 and e2 that fix both ends of the pipe d changes greatly, and as a result, the second pipe d swings around greatly as the first arm c rotates.

Furthermore, in the conventional example shown in FIG. 5, a bundle of wiring and piping is connected from the second arm e to the drive mechanism k, and from there to the finger h. wiring and rotation around the vertical axis.
It has been pointed out that the problem is that the bundle of pipes gets entangled with the vertical arm j and the finger h. In addition, the connection position of the first and second pipes b and d is far away from the rotation center of the second arm e, and as in the case of the first prior art described above, the second arm e is When it rotates, the distance between the nuts e1 and e2 that fix both ends of the second pipe d changes greatly, and as a result, the second pipe d swings around greatly as the first arm c rotates. Problems have been pointed out.

Furthermore, in the conventional example shown in FIG. 6, since the bundle of wiring and piping from the finger h passes through the vertical arm j, this The problem of a bundle of wiring and piping becoming entangled with the vertical arm j does not occur. However, since the bundle of wiring and piping taken out from the top of the vertical arm j passes through the second pipe d and is connected to the fixing jig m on the first arm c, the second pipe The bundle of wiring and piping in d is subjected to excessive twisting in order to absorb the torsion caused by the vertical movement and rotation of vertical arm j and the rotation of second arm e, and the wiring and piping are This creates major problems with durability and reliability.

[0010] Here, the durability of the bundle of wiring and piping will be discussed below. The bundle used here is a robot cable, and compared to normal cables, it is made up of a large number of wires with thinner cores twisted together.As a result, it is highly flexible, It has more than 10 times the durability against bending and twisting compared to normal cords.

As shown in FIG. 7, the durability test is conducted by bending the cable n left and right by 90 degrees left and right at a rate of 60 times per minute so that the bending radius is 17.5 mm. As a result, it was confirmed that the wire broke after approximately 2 million cycles. Cables routed inside actual robots are designed to avoid severe conditions such as a bending radius of 17.5 mm, but bending causes torsion, which reduces the cable's durability. It is understood that due consideration must be given to the wiring method inside the robot so as not to put stress on the cables, as this can occur up to 10,000 times a day when the robot is used on three shifts. It is something that

[0012] This invention was made in view of the above-mentioned problems, and an object of the invention is to prevent excessive twisting from occurring in wiring piping, thereby improving durability and reliability. The objective is to provide industrial robots with various features. Another object of the present invention is to provide an industrial robot that can reduce costs by reducing the number of man-hours required for manufacturing fixing jigs, wiring assemblies, and connections. .

[0013]

[Means for Solving the Problems] In order to achieve the above-mentioned object, an industrial robot according to the present invention includes a base portion,
a first arm having one end rotatably attached to the base; a second arm having one end rotatably attached to the other end of the first arm; Attached to the other end so that it can move up and down and rotate freely,
A finger means for gripping parts is removably attached to the lower end, a third arm formed in a hollow shape, a driving means for driving each of the first to third arms, and a third arm for driving the third arm. Industrial use, comprising a control means for controlling the means, wiring and piping means for supplying a control signal from the control means to the drive means, and for supplying a control signal and supplying a working fluid to the finger means. In the robot, the wiring/piping means is connected to a fixing jig attached to the base, one end is connected to the fixing jig, the other end is connected to the second arm, and the wiring/piping means is flexible. a first pipe having one end connected to the second arm;
a flexible second pipe connected at its other end to the third arm; and a flexible second pipe connected at its other end to the control means; It is characterized by comprising a bundle of wiring and piping that passes through the arm and is connected at the other end to the finger means, for supplying a control signal from the control means and a working medium to the finger means. It is said that

Further, in the industrial robot according to the present invention, the connection positions of the first and second pipes to the second arm are set to be close to the rotation center position of the second arm. It is characterized by being Also,
The industrial robot according to the present invention is characterized in that the bundle of wiring and piping passing through the first and second pipes is coated with a lubricant.

Furthermore, the industrial robot according to the present invention is characterized in that the wiring passing through the first and second pipes is composed of a plurality of single wires grouped together. Further, in the industrial robot according to the present invention,
The other end of the first pipe is rotatably connected to the second arm.

[0016] Furthermore, in the industrial robot according to the present invention, a ring-shaped protection jig with a rounded inner peripheral surface is attached to the other end of the first pipe. . Further, in the industrial robot according to the present invention, a nut fixed to the second arm is rotatably attached to the other end of the first pipe, and the nut is connected to the other end of the first pipe. A feature is that a lubricant is applied between them.

[0017]

[Operation] By configuring the means for solving the problem as described above, the bundle of wiring and piping is connected at one end to the fixing jig attached to the base, and the other end is connected to the fixing jig attached to the base. The first flexible pipe is connected to the second arm and the other end is connected to the third arm.
The second pipe is connected to the arm of the arm, and passes through a second flexible pipe, and the third arm is connected to the finger means, and the control signal from the control means is transmitted to the finger means. The supply and the supply of the working medium take place via this wiring/piping bundle.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of an embodiment of an industrial robot according to the present invention will be explained in detail below with reference to FIGS. 1 to 3. As shown in FIG. 1, the industrial robot 10 of this embodiment includes a hollow cylindrical base portion 12 that is fixed in an upright position on a base (not shown). This base part 1
A base end portion of a first horizontal arm 14 is attached to the upper end portion of 2 so as to be rotatable within a horizontal plane about a first vertical axis C1. On the distal end of the first horizontal arm 14, the proximal end of the second horizontal arm 16 is aligned with the second vertical axis C.
It is attached so that it can rotate freely in a horizontal plane. At the tip of this second horizontal arm 16, there is a vertical arm 1
8 is attached to be rotatable around the third vertical axis C3 and movable along the third vertical axis C3, that is, movable up and down.

This vertical arm 18 is formed from a hollow pipe member. Further, a finger 20 is detachably attached to the lower end of the vertical arm 18 via an attachment/detachment jig 22 for gripping parts (not shown). A plurality of openings (not shown) are formed on the circumferential surface of this attachment/detachment jig 22 to take out a bundle of piping/wiring 24 that has passed through the vertical arm 18 to the outside in order to drive the finger 20. has been done.

A first drive motor 28 for rotationally driving the first horizontal arm 14 is housed within the base portion 12 described above. Further, a second drive motor 30 for rotationally driving the second horizontal arm 16 is mounted approximately at the center of the first horizontal arm 14 in the longitudinal direction. Furthermore, a vertical arm 18 is provided at the base end of the second horizontal arm 16, that is, at the center of rotation of the second horizontal arm 16.
A third drive motor 32 for vertically moving the vertical arm 18 and a fourth drive motor 34 for rotationally driving the vertical arm 18 are arranged in parallel with the second vertical axis C3 interposed therebetween. . These third and fourth drive motors 32, 34 are connected to a third drive motor 32, 34 located on the proximal end of the second horizontal arm 16.
and is accommodated in a third fixing jig 36 for fixing the wiring to the fourth drive motors 32, 34.

Here, a control device 38 for driving and controlling the first to fourth drive motors 28, 30, 32, and 34 and the finger 20 described above is placed on a base (not shown). This control device 38 and each drive motor 28, 30
, 32, 34 and the finger 20 via first to fifth wiring cables 40, 42, 44, 46, 48, these wiring cables 40, 42, 44, 46
, 48, control signals are supplied from this control device 38 to each drive motor 28, 30, 32, 34 and finger 20, respectively.

In this embodiment, the finger 20 described above is configured to be driven by compressed air as a working fluid. Therefore, this finger 2
0 is connected to a pneumatic tube 50 as piping for connecting to a pneumatic source (not shown). This pneumatic tube 50 is also once connected to the control device 38 described above in order to undergo intermittent control of the supply of compressed air. And the above-mentioned bundle of wiring and piping 2
4 are these first to fifth wiring cables 40, 42,
44, 46, 48, and a pneumatic tube 50.

[0023] The aspects of wiring and piping that characterize the present invention will be explained below. First, a first fixing jig 52 for fixing the bundle 24 of wiring and piping from the control device 38 is attached to the side of the base portion 12 described above. This first fixing jig 52 is formed into a hollow shape with an open bottom. Specifically, the first fixing jig 52 is fixed to the side of the base portion 12 and is attached to the substantially second horizontal arm 1.
an upright portion 52A that stands upright up to a height of 6; an inclined portion 52B that slopes from the upper end of the upright portion 52A toward the first vertical axis C1; A horizontal portion 5 extending horizontally between the vertical axes C1 of
It is composed of 2C. In other words, the tip of the horizontal portion 52C of the first fixing jig 52 is set to be located directly above the rotation center defined by the first vertical axis C1 of the first horizontal arm 14. ing. That is, the upper part of the first fixing jig 52 is formed to protrude above the center of rotation of the first horizontal arm 14.

[0024] Then, the first wiring/piping as described above is
to fifth wiring cables 40, 42, 44, 46, 48
The pneumatic tubes 50 are all assembled into a bundle as indicated by the reference numeral 24, and are once introduced into the first fixing jig 52 through its bottom opening 52a. Also, within this first fixing jig 52, this bundle 24
The first distribution cable 40 has been removed from the. The thus removed and independent first wiring cable 40 is connected to the first fixing jig 52 through the communication port 52b formed at the joint between the first fixing jig 52 and the base portion 12. 52 into the base body 12 and is directly connected to the first drive motor 28 .

On the other hand, the remaining bundle 24 from which the first wiring cable 40 has been removed is firmly fixed to the inner surface of the first fixing jig 52 via the mounting bracket 56, and It has been pulled into the upper part of the jig 52. The second distribution cable 42 is removed from the bundle 24 at the upper part of the first fixing jig 52 . The second wiring cable 42, which is separated from the bundle 24 and becomes independent, is attached to the lower surface of the upper part of the first fixing jig 52, that is, the part facing the rotation center of the first horizontal arm 14. The first
has been taken out of the fixing jig 52.

[0026] Also, on the first horizontal arm 14,
A second fixing jig 60 for attaching and fixing the second wiring cable 42 to the second drive motor 30 while being located on the first vertical axis C1 that defines the rotation center of the second fixing jig 60
is installed. This second fixing jig 60 incorporates the second wiring cable 42 taken out independently from the first fixing jig 52 described above. The second wiring cable 42 is held within this second fixing jig 60 via a mounting bracket 62. Further, the second wiring cable 42 is taken out from the second fixing jig 60 and connected to the second drive motor 30. Here, a second fixing jig located between the first fixing jig 52 and the second fixing jig 60 is used.
As shown in the figure, a portion of the wiring cable 42 is formed as a coil portion 42A having a spiral shape.

In this way, the coil portion 42A is provided between the first fixing jig 52 and the second fixing jig 60.
By configuring the second wiring cable 42, even if the first horizontal arm 14 is rotationally driven around the first vertical axis C1, the second wiring cable 42 accompanying the rotational drive is
The twisting is reliably absorbed in this coil portion 42A, and the durability and reliability of the wiring are maintained at a high level.

A portion of the second wiring cable 42 located between the second fixing jig 60 and the second drive motor 30 is detachably connected via a connector 64. By configuring the second wiring cable 42 such that the connector 64 is interposed between the second fixing jig 60 and the second drive motor 30, the second wiring cable 42 can be This will greatly improve the efficiency of routing work.

Here, between the first fixing jig 52 and the above-mentioned third fixing jig 36, the wiring/piping from which the first and second wiring cables 40, 42 have been removed is provided. bundle 24
A first pipe 66, through which the first pipe 66 is inserted, extends in a substantially U-shape. The first pipe 66 is made of a flexible material and is flexible. The first pipe 66 is fixed at one end through a first nut 68 in a state coaxial with the first vertical axis C1 on the upper surface of the upper part of the first fixing jig 52. and at the other end a second nut 70 and a hexagonal nut 72.
It is rotatably attached to a portion of the upper surface of the third fixing jig 36 on the first fixing jig 52 side via.

Further, as shown in FIG. 2, this first pipe 66 has a large number of circumferential grooves 66a extending along the circumferential direction formed on its outer periphery over its entire length. The manner in which the other end of the first pipe 66 is attached to the third fixing jig 36 is configured as shown in FIG. 2. That is, the second nut 70 is formed into a cylindrical shape with the upper and lower ends open, and the lower end, that is, the end inserted into the third fixing jig 36, is provided with a screw. is cut. The other end of the first pipe 66 is connected to the second pipe 66.
It is inserted into the nut 70 of.

On the other hand, on the outer periphery of this second nut 70,
An insertion groove 70a extending approximately semicircularly is formed. A so-called horseshoe-shaped locking member 74 is removably attached to this insertion groove 70a, and both ends of this locking member 74 are connected to the first pipe 6 inserted into the second nut 70.
They are respectively fitted into mutually opposing portions in an outer circumferential groove 66a formed in the outer circumferential groove 66a. In this way, the first pipe 6
The other end of 6 is rotatably attached to the second nut 70.

In this way, the lower end of the second nut 70 to which the first pipe 66 is rotatably attached is placed exactly on the upper surface of the third fixing jig 36. It is taken into the third fixing jig 36 through an attachment opening (not shown) formed with a size set so that it can be inserted therethrough. A hexagonal nut 72 is screwed into the lower end of the second nut 70 taken into the third fixing jig 36. In this way, the second nut 70 and the hexagonal nut 72 sandwich the upper surface portion of the third fixing jig 36 from above and below, so that the second nut 70
As a result, the other end of the first pipe 66 is rotatable with respect to the third fixing jig 36 via the second nut 66. In addition, it will be connected in a state where future withdrawal is prevented.

As shown in FIG. 2, a bundle of wiring and piping 2 is attached to the bottom surface of the hexagonal nut 70 via a bolt (not shown).
A protection jig 76 is attached to protect 4. As shown in FIG. 3, this protective jig 76
The main body 76a has a cylindrical shape with an open upper limit and has an outer diameter substantially the same as the outer diameter of the main body 76a, and an inner flange portion 76b integrally formed at the lower end of the main body 76a. Here, the opening defined by the inner peripheral edge of the inner flange portion 76b is aligned so as to be substantially coaxial with the opening at the other end of the first pipe 66. Moreover, this inner flange portion 76b
The inner circumferential edge is rounded and has a semicircular cross section.

By providing the protective jig 76 in this way,
The bundle of wiring and piping 24 taken out from the other end of the first pipe 66 to the third fixing jig 36 via the lower end of the second nut 70 is connected to the first and second horizontal arms 14, 16. Even if the nut 7 is twisted due to rotational driving, it only slides into contact with the inner peripheral edge of the rounded protection jig 76, and the second nut 7
0 is prevented from slidingly contacting the inner circumferential surface of the lower end outlet. As a result, the risk of the wire/piping bundle 24 slidingly contacting the inner circumferential surface of the lower end outlet of the second nut 70 and breaking due to wear is reliably avoided.

Furthermore, although not shown, grease as a lubricant is attached to the rotatable joint between the other end of the first pipe 66 and the second nut 70. In this way, the other end of the first pipe 66 rotates relative to the second nut 70 in response to the rotational drive of the first and second horizontal arms 14 and 16, thereby creating a gap between the two. Although a relative sliding condition occurs, the adhesion of this grease effectively prevents the wear caused by this sliding.

Furthermore, as mentioned above, this first pipe 6
The other end of 6 is rotatably attached to the upper surface of the third fixing jig 36 on the first fixing jig 52 side via a second nut 70. In other words, the first
The other end of the pipe 66 is connected to the upper surface of the third fixing jig 36 near the second vertical axis C2, that is, approximately at the center of rotation. As a result, even when the first and second horizontal arms 14, 16 rotate in the horizontal plane, the distance between both ends of the first pipe 66, that is, the distance between the nuts 68, 70, changes less. Substantially, this distance change is negligible.

Therefore, in this embodiment, even if the first and second horizontal arms 14 and 16 rotate, both ends of the first pipe 66 are fixed to the first and third fixing jigs, respectively. First and second nuts 6 for connecting to 52 and 36
No unnecessary load is applied to the first pipe 66 and the first and second nuts 68, 70, and shortening of the lifespan of the first pipe 66 and the first and second nuts 68, 70 is effectively prevented.

On the other hand, in the first fixing jig 52,
As described above, since the upright portion 52A and the horizontal portion 52C are connected via the inclined portion 52B, the wiring/piping bundle 24 passing through the first fixing jig 52 is through the U-shaped first pipe 66, and then the third fixing jig 3 through the second nut 70.
It was taken out within 6. In this way, the wiring/piping bundle 24 is taken out from the second nut 70 substantially vertically downward, and the rotational drive of the first and second horizontal arms 14 and 16 is Even if done, bundle 2
4 is reliably absorbed by this inclined portion 52B, and the bundle 24 is no longer twisted at the exit of the second nut 70. Therefore, it is effective to make sliding contact with the second nut 70 and the protective jig 76. It will be suppressed. As a result, even the rounded sliding surface of the protective jig 76 as described above makes it difficult for the wiring/piping bundle 24 to come into sliding contact, further shortening the life of the bundle 24 due to wear. It is effectively suppressed and the lifespan is extended.

[0039] Also, the wiring passing through this first pipe 66
A lubricant is applied to the pipe bundle 24. As a result, the first and second horizontal arms 14, 16
When the wiring/piping bundle 24 is twisted in the first pipe 66 which deforms as it is rotated about the vertical axes C1 and C2 of the pipe, it slides into contact with the inner wall of the first pipe 66 The partial load that occurs will be effectively reduced.

On the other hand, the bundle of wiring and piping 24 inserted through the first pipe 66 is taken out into the third fixing jig 36. And here, from the bundle 24, the third and fourth
The distribution cables 44, 46 are removed. The independent third and fourth distribution cables 44 and 46 thus removed from the bundle 24 are held on the inner wall of the third fixing jig 36 via the mounting bracket 78, and the third and fourth distribution cables 44, 46, respectively, are 4 drive motors 32 and 34. still,
Portions of the third and fourth wiring cables 44 and 46 located between the mounting bracket 78 and the third and fourth drive motors 32 and 34 are removably connected via connectors 80 and 82, respectively. has been done.

Further, a fourth fixing jig 84 is attached to the upper end of the vertical arm 18 described above for attaching and fixing the bundle 24 of wiring and piping to the finger 20. Between this fourth fixing jig 84 and the above-described third fixing jig 36, first to fourth wiring cables 40,
Bundle of wiring and piping 24 with 42, 44, and 46 removed
A second pipe 86, through which the second pipe 86 is inserted, extends in a substantially U-shape. This second pipe 86 is connected to the first pipe mentioned above.
Like the pipe 66, it is made of a flexible material and is flexible. This second pipe 86 is connected at one end to a third nut 88.
Vertical arm 18 on the upper surface of the third fixing jig 36
Attached to the side part, and at the other end, a fourth nut 9
0 to the upper surface of the fourth fixing jig 84.

The fifth wiring cable 4 constituting the wiring/piping bundle 24 taken into this fourth fixing jig 84
8 and the piping tube 50 are attached to the inner wall of the fourth fixing jig 84 via the mounting bracket 92,
Thereafter, it passes through the hollow vertical arm 18 and is connected to the finger 20 via an attachment/detachment jig 22. Note that these fifth wiring cables 48 and piping tubes 50 are
Inside the fourth fixing jig 84, a pair of connectors 94
, 96, respectively, and in the attachment/detachment jig 22, a pair of connectors 98, 1
00, and are detachably connected to each other.

In this way, by connecting the fifth wiring cable 48 and the piping tube 50 in a detachable manner within the fourth fixing jig 84 and the attachment/detachment jig 22,
The work of attaching and removing the finger 20 can be easily performed, and the work of replacing the second pipe 86 due to disconnection of wiring or piping can also be easily performed. Also, in the fourth fixing jig 84, wiring and
The bundle of piping 24 is attached in a bundled state by the mounting bracket 92, so that when the vertical arm 18 is rotated around the third vertical axis C3, the wiring and
The twist of the pipe bundle 24 can be absorbed over a long distance within the second pipe 86.

[0044] Also, the wiring passing through this second pipe 86
The pipe bundle 24, like the first pipe 66, is coated with lubricant. As a result, the vertical arm 18 is rotated around the third vertical axis C3, and the vertical arm 18 is rotated around the third vertical axis C3.
The second pipe 8 deforms as it moves up and down along 3.
When the wiring/piping bundle 24 is twisted in the pipe 6, the partial load generated by sliding contact with the inner wall of the second pipe 86 is effectively reduced.

[0045] Here, the fifth wiring cable 48 constituting the wiring/piping bundle 24 is composed of a plurality of individually coated single wires bundled together, and the entire cable is further coated with an outer jacket. However, in this embodiment, the outer skin of the fifth distribution cable 48 that is inserted into the second pipe 86 is partially cut open, and a part of the single wire is taken out from inside. .

As a result, the fifth wiring cable 48 is
In the work of inserting the fifth cable into the second pipe 86, the rigidity of the cable itself is weakened, and the work for inserting the fifth cable into the second pipe 86 is facilitated. The portion of the distribution cable 48 that is inserted into the second pipe 86 is connected to the third portion of the vertical arm 18.
Rotational drive around the vertical axis C3 of the third vertical axis C3
This makes it possible to effectively absorb the twisting caused by vertical movement along the .

[0047]

As described in detail above, the industrial robot according to the present invention includes a base portion, a first arm having one end rotatably attached to the base portion, and the first arm. A second end rotatably attached to the other end.
The second arm is attached to the other end of the second arm so as to be vertically movable and rotatable, and a finger means for grasping parts is detachably attached to the lower end, and a hollow second arm is attached to the other end of the second arm. a drive means for driving each of the first to third arms, a control means for controlling the drive means, supplying a control signal from the control means to the drive means; In an industrial robot equipped with wiring/piping means for supplying control signals and working fluid to the finger means, the wiring/piping means has a fixing jig attached to the base portion, and one end of the wiring/piping means. A flexible first pipe is connected to the fixing jig and has its other end connected to the second arm; a flexible second pipe connected to the third arm, one end of which is connected to the control means, passing through the first pipe, the second pipe, and the third arm; It is characterized by comprising a bundle of wiring and piping whose other end is connected to the finger means and for supplying control signals from the control means and working medium to the finger means.

Further, in the industrial robot according to the present invention, the connection positions of the first and second pipes to the second arm are set to be close to the rotation center position of the second arm. It is characterized by being Also,
The industrial robot according to the present invention is characterized in that the bundle of wiring and piping passing through the first and second pipes is coated with a lubricant.

Furthermore, the industrial robot according to the present invention is characterized in that the wiring passing through the first and second pipes is composed of a plurality of single wires grouped together. Further, in the industrial robot according to the present invention,
The other end of the first pipe is rotatably connected to the second arm.

[0050] Furthermore, in the industrial robot according to the present invention, a ring-shaped protection jig with a rounded inner peripheral surface is attached to the other end of the first pipe. . Further, in the industrial robot according to the present invention, a nut fixed to the second arm is rotatably attached to the other end of the first pipe, and the nut is connected to the other end of the first pipe. A feature is that a lubricant is applied between them.

Therefore, according to the present invention, there is provided an industrial robot that can prevent excessive twisting from occurring in the wiring and piping, thereby improving durability and reliability. It will happen. Further, according to the present invention, there is provided an industrial robot that can reduce costs by reducing the number of man-hours required for manufacturing fixing jigs, assembling wiring, and connecting.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing the configuration of an embodiment of an industrial robot according to the present invention.

2 is a vertical sectional view specifically showing how the other end of the first pipe is attached to a third fixing jig in the industrial robot shown in FIG. 1; FIG.

3 is a partial vertical cross-sectional view and a plan view showing a specific shape of the protection jig shown in FIG. 2. FIG.

FIG. 4 is a front view showing a first example of the prior art.

FIG. 5 is a front view showing a second example of the prior art.

FIG. 6 is a front view showing a third example of the prior art.

FIG. 7 is a diagram for schematically explaining the implementation state of a cable durability test.

[Explanation of symbols]

10 Industrial robots, 12 Base part, 14 First horizontal arm, 16 Second horizontal arm, 18 Vertical arm, 20 Finga, 24 Bundle of wiring and piping, 28 First drive motor, 30 Second drive motor, 32 Third drive motor, 34 Fourth drive motor, 36 Third fixing jig, 38 Control device, 52 First fixing jig; 66 First pipe, 70 Second Natsu, 76 Protective jig, 86 This is the second pipe.

Claims (7)

[Claims] Claim 1: A base part, a first arm having one end rotatably attached to the base part, and a second arm having one end rotatably attached to the other end of the first arm. The arm is attached to the other end of the second arm so as to be vertically movable and rotatable, and the lower end is detachably attached to a finger means for gripping parts, and a third arm is formed in a hollow shape. a drive means for driving each of the first to third arms, a control means for controlling the drive means, supplying a control signal from the control means to the drive means, and In an industrial robot equipped with wiring/piping means for supplying control signals and working fluid to the means, the wiring/piping means:
a fixing jig attached to the base portion; a flexible first pipe having one end connected to the fixing jig and the other end connected to the second arm; a flexible second pipe connected to the second arm and having the other end connected to the third arm; Wiring passes through the second pipe and the third arm, and is connected at the other end to the finger means, for supplying a control signal from the control means and a working medium to the finger means.・An industrial robot characterized by being equipped with a bundle of piping. 2. The connection position of the first and second pipes to the second arm is set to be close to the rotation center position of the second arm. The industrial robot according to item 1. 3. The industrial robot according to claim 1, wherein the bundle of wiring and piping passing through the first and second pipes is coated with a lubricant. 4. The industrial robot according to claim 1, wherein the wiring passing through the first and second pipes is composed of a plurality of single wires grouped together. 5. The industrial robot according to claim 1, wherein the other end of the first pipe is rotatably connected to the second arm. 6. The industrial robot according to claim 5, wherein a ring-shaped protection jig with a rounded inner peripheral surface is attached to the other end of the first pipe. 7. A nut fixed to the second arm is rotatably attached to the other end of the first pipe, and a lubricant is provided between the other end of the first pipe and the nut. 6. The industrial robot according to claim 5, wherein the industrial robot is coated with an agent.