WO2017082385A1

WO2017082385A1 - Conveyance device, conveyance system, and conveyance method

Info

Publication number: WO2017082385A1
Application number: PCT/JP2016/083504
Authority: WO
Inventors: 春菜衛藤; 隆史園浦; 秀一中本; 小川　昭人; 菅原　淳; 淳也田中
Original assignee: 株式会社東芝
Priority date: 2015-11-12
Filing date: 2016-11-11
Publication date: 2017-05-18

Abstract

A conveyance device according to one embodiment of the present invention has an information acquisition unit and a control unit. The information acquisition unit acquires information pertaining to at least a first article and a second article. On the basis of the overlapping width of the first article and the second article in a first direction in a projection plane seen at a direction substantially parallel to the conveyance direction of the first article, and the overlapping width of the first article and the second article in a second direction intersecting the first direction in the projection plane, said overlapping widths being from the information acquired by the information acquisition unit, the control unit determines the movement direction of a holding part that holds the first article.

Description

Conveying device, conveying system, and conveying method

Embodiments of the present invention relate to a transfer device, a transfer system, and a transfer method.

2. Description of the Related Art A conveying device that takes out articles from a pallet is known.
In some cases, it is difficult for the transport device to take out the article at a high speed.

Japanese Patent No. 3444171

The problem to be solved by the present invention is to provide a transport device, a transport system, and a transport method capable of increasing the speed of taking out an article.

The conveyance device of the embodiment has an information acquisition unit and a control unit. The information acquisition unit acquires information on at least the first article and the second article. When the second article is positioned in the conveyance direction of the first article with respect to the first article, the control unit is configured in a direction substantially parallel to the conveyance direction from the information acquired by the information acquisition unit. A second direction in which the overlap width in the first direction of the first article and the second article on the projected projection plane intersects the first direction of the first article and the second article on the projection plane. The moving direction of the holding portion that holds the first article is determined based on the overlapping width of the first article.

The side view which shows the conveying apparatus of 1st Embodiment. The side view which shows the structural example of the holding | maintenance part of 1st Embodiment. The block diagram which shows the system configuration | structure of the conveying apparatus of 1st Embodiment. The flowchart which shows an example of the flow of the conveying method of 1st Embodiment. FIG. 5 is a plan view illustrating an example of a check area according to the first embodiment. The perspective view which shows the example of the loading state of the articles | goods of 1st Embodiment. The perspective view which shows the example of the loading state of the articles | goods of 1st Embodiment. The flowchart which shows an example of the flow of the avoidance operation | movement of 1st Embodiment. The perspective view which shows typically the avoidance operation | movement of 1st Embodiment. The perspective view which shows typically the 1st operation example of the conveying apparatus of 1st Embodiment. The perspective view which shows typically the 2nd operation example of the conveying apparatus of 1st Embodiment. The perspective view which shows typically the 3rd operation example of the conveying apparatus of 1st Embodiment. The block diagram which shows the modification of the system configuration | structure of the conveying apparatus of 1st Embodiment. The perspective view which shows the modification of the conveying method of 1st Embodiment. The perspective view which shows typically the determination method of the taking-out object article of 2nd Embodiment. The perspective view which shows typically the determination method of the taking-out object article of 2nd Embodiment. The flowchart which shows an example of the flow of the conveying method of 2nd Embodiment. The perspective view which shows the example of the loading state of the articles | goods of 3rd Embodiment. The figure which shows typically the determination method of the loading state of the articles | goods of 3rd Embodiment. 9 is a flowchart illustrating an example of a flow of a conveyance method according to a third embodiment. The side view which shows the conveying apparatus of the modification of embodiment. The block diagram which shows the system configuration | structure of the conveying apparatus of the modification of embodiment. The perspective view which shows an example of the 1st mounting area | region of the modification of embodiment.

Hereinafter, a transport device, a transport system, and a transport method according to an embodiment will be described with reference to the drawings. In the following description, the same reference numerals are given to configurations having the same or similar functions. And the description which overlaps those structures may be abbreviate | omitted.

(First embodiment)
The first embodiment will be described with reference to FIGS. 1 to 12.
FIG. 1 shows a transport apparatus 1 according to this embodiment.
As shown in FIG. 1, the conveying apparatus 1 is an automatic unloading apparatus, for example. The transport apparatus 1 is installed between the first placement area S1 and a second placement area (not shown). The transport apparatus 1 takes out an article (conveyance object, holding object) M placed in the first placement area S1 and moves it to the second placement area. In the first placement area S1, for example, a plurality of articles M having different sizes and shapes are placed irregularly. The transport apparatus 1 may be referred to as a “load handling apparatus”. However, the article M transported by the transport apparatus 1 is not limited to a packaged package, and may be a part in a production line. The article M is not limited to a cubic article, and the shape is not limited. For example, the article M may be a trapezoidal article or an article having a part of the roundness. The transfer device, transfer system, and transfer method of the present embodiment can be widely applied to an automatic logistics input device, an article supply device in a factory, and the like.

In this application, the “placement area” means a place where an article is placed and is not limited to an area having a specific shape or function. In addition, the phrase “placed (or located)” in the present application refers to an article placed on the placement surface in addition to the case of being placed directly on the placement surface of the placement region. Including the case where it is placed on top. The “mounting area” referred to in the present application may be referred to as a “loading unit” or a “loading area”. However, “loading” in the present application is not limited to a case where a plurality of articles are stacked one above the other, and includes a case where a plurality of articles are placed side by side on a plane.

In the present embodiment, the first placement area S1 is, for example, a box pallet BP. An example of the box pallet BP is a roll box pallet (RBP) having wheels. On the other hand, the second placement area is, for example, a belt conveyor. The conveyance device 1 and the belt conveyor are fixed to the floor surface. However, the transport device 1 may be movable by wheels or rails. Each of the first placement area S1 and the second placement area is not limited to the above example, and may be any one of a belt conveyor, a carriage, a pallet, a work table, and the like.

Here, for convenience of explanation, the + X direction, -X direction, + Y direction, -Y direction, + Z direction, and -Z direction are defined. The + X direction, the −X direction, the + Y direction, and the −Y direction are, for example, substantially along the horizontal plane. The + X direction is a direction from the transport device 1 toward the first placement region S1. The + X direction may be referred to as an “approach direction”. The −X direction is the opposite direction to the + X direction. The −X direction is the conveyance direction of the article M. Note that “the conveyance direction of the article” in the present application is a direction in which the article M taken out from the placement region S1 is conveyed toward the conveyance device 1. The + Y direction is a direction that intersects with the + X direction (for example, a direction that is substantially orthogonal), for example, the width direction of the article M. The −Y direction (see FIG. 5) is the opposite direction to the + Y direction. The + Z direction is a direction that intersects the + X direction and the + Y direction (for example, a direction that is substantially orthogonal), for example, a substantially vertical downward direction. The −Z direction is a direction opposite to the + Z direction, for example, a substantially vertical upward direction. In the following description, the front side is “front”, the back side is “rear”, the left side is “left”, and the right side is based on the direction (+ X direction) from the transfer device 1 toward the first placement region S1. Called “right”.

As illustrated in FIG. 1, the transport device 1 includes a base 11, an arm 12, a holding unit (gripping unit) 13, a detection unit 14 (see FIG. 3), a control unit 15 (see FIG. 3), and a conveyor 16. .

The base (body frame) 11 is installed on the floor surface. The base 11 includes struts 11a extending along the −Z direction, and is formed in a frame shape, for example.

The arm (arm device) 12 is an orthogonal robot arm, for example, and is an example of an articulated arm. The arm 12 is connected to the base 11. For example, the arm 12 includes a first member 12a, a second member 12b, and a third member 12c. The first member 12a is guided by a guide provided on the column 11a of the base 11, and is movable in the + Z direction and the -Z direction. The second member 12b is supported and guided by the first member 12a and is movable in the + Y direction and the −Y direction. The third member 12c is supported and guided by the second member 12b, and is movable in the + X direction and the -X direction. A holding portion 13 to be described later is attached to the distal end portion of the arm 12. The arm 12 moves the holding unit 13 to desired positions in the + X direction, −X direction, + Y direction, −Y direction, + Z direction, and −Z direction. The “arm” in the present application widely means a member that moves the holding portion 13 to a desired position, and is not necessarily limited to a rod-shaped member. The arm 12 may be referred to as a “driving unit”, a “moving mechanism”, or a “holding unit moving mechanism” that moves the holding unit 13.

The holding unit 13 is an end effector capable of holding the article M. An example of the holding unit 13 includes a plurality of suction cups 21 connected to a vacuum pump and an electromagnetic valve that controls the suction operation of the suction cups 21. The holding unit 13 holds (holds) the article M when the suction cup 21 in contact with the article M is vacuum-sucked. Note that “gripping” in the present application is used in a broad sense of “holding an article”, and is not limited to the meaning of “holding a grip”. The holding unit 13 is disposed toward the opening surface of the box pallet BP that is an example of the first placement region S1. The holding unit 13 is moved toward the first placement area S1 by the arm 12, and holds the article M placed in the first placement area S1. The holding unit 13 is moved by the arm 12 to carry the held article M toward the second placement area.

FIG. 2 shows some configuration examples of the holding unit 13.
In the example illustrated in FIG. 2A, the holding unit 13 includes a suction cup 21 that can suck the end face (front face) Mf of the article M. In the example shown in (b) of FIG. 2, the holding unit 13 includes a suction cup 21 that can adsorb the top surface Ma of the article M. The “top surface” in the present application means the upper surface at the highest position in the article M. In addition, the “top surface” referred to in the present application is not limited to a geometric plane. The “top surface” referred to in the present application may be a curved surface or a surface with unevenness. In other words, the “top surface” means a holding area that can be held by the holding unit 13 approaching from one direction.
In the example shown in (c) of FIG. 2, the holding unit 13 includes a plurality of support units 22 that sandwich the article M. That is, the holding unit 13 is not limited to suction, and may hold the article M by holding the article M. In addition, the structure of the holding | maintenance part 13 may be other structures.

Here, the conveyor 16 will be described first.
As shown in FIG. 1, the conveyor 16 is provided on the base 11. The conveyor 16 may be movable in the + Z direction and the −Z direction along the base column 11a. Although the conveyor 16 is a belt conveyor, for example, it is not limited to this. The conveyor 16 may be a roller conveyor including a plurality of rollers that are actively rotated. On the conveyor 16, the article M taken out from the first placement area S 1 by the holding unit 13 and carried is placed. That is, the conveyor 16 receives the article M carried by the holding unit 13 from the holding unit 13, conveys the article M in the −X direction, and moves it to the second placement area. The conveyor 16 may be omitted. In this case, the article M may be moved directly to the second placement area by the arm 12 and the holding unit 13.

Next, the detection unit 14 will be described.
The detection unit 14 is an example of an “information acquisition unit”. The detection unit 14 acquires information on at least a first article and a second article, which will be described later. For example, the detection unit 14 acquires information on a plurality of articles M including the first article, the second article, and the third article. The “information about the article” in the present application refers to, for example, the position of the article M placed in the first placement area S1 (for example, the position of the article M in the transport direction, the position of the top surface Ma of the article M, and the transport). This is information for recognizing at least one of the position of the front edge portion Ms of the article M in the direction. The “information regarding the article” includes information regarding the loading state of the article M such as the size of the article M and the loading order of the article M, for example.

In the present embodiment, the detection unit 14 includes a sensor such as a camera. The detection unit 14 acquires information (for example, information photographed by a camera) that directly detects the article M as information about the article M. The “information acquisition unit” referred to in the present application is not limited to a sensor such as a camera. The “information acquisition unit” referred to in the present application may be an information acquisition unit that acquires information about the article M by receiving information from a database in which information about the article M is stored. In addition, the “information acquisition unit” referred to in the present application is provided separately from the transport device 1 and may be a sensor that detects a state when the article M is loaded (for example, when the article M is loaded into the first placement area S1). Good. Note that the information acquisition unit that acquires information about the article M by receiving information from the database will be described in detail in a later-described modification.

FIG. 3 is a block diagram illustrating a system configuration of the transport apparatus 1.
As shown in FIG. 3, the detection unit 14 includes a first detection unit 14A and a second detection unit 14B.
The first detection unit 14A detects a plurality of articles M placed in the first placement area S1. For example, the first detection unit 14A detects information related to the overall arrangement (loading state) of the plurality of articles M placed in the first placement area S1. Specifically, the first detection unit 14A includes a first sensor 25A and a first recognition unit 26A.

The first sensor 25A includes a first image acquisition unit 27A that acquires image data of a plurality of articles M. The first sensor 25A is, for example, a camera that photographs the first placement area S1 from above (see FIG. 1). For example, the first sensor 25A is an infrared dot pattern projection type camera capable of measuring a three-dimensional position. An infrared dot pattern projection type camera captures an infrared image of a target object in a state where an infrared dot pattern is projected onto the target object. The first sensor 25A sends the acquired data to the first recognition unit 26A. The first sensor 25A may be an optical camera or may be a sensor other than the camera.

The first recognition unit (first analysis unit) 26A is realized by, for example, a part of circuits included in the circuit board 31 described later. For example, the first recognition unit 26 A is a software function unit that is realized by a processor such as a CPU (Central Processing Unit) executing a program stored in the memory of the circuit board 31. Alternatively, the first recognition unit 26A may be realized by hardware such as an LSI (Large Scale Integration), an ASIC (Application Specific Integrated Circuit), or an FPGA (Field-Programmable Gate Array) mounted on the circuit board 31. Good. The first function unit 26A may be realized by a combination of a software function unit and hardware. The first recognizing unit 26A detects position information of the plurality of articles M based on the data acquired by the first sensor 25A. The position information of the plurality of articles M includes, for example, information on the position of the end (edge) of the outer shape of each article M and the height position of the top surface Ma of each article M. The “height (or height position) of the top surface of the article” as used in the present application refers to loading from a preset reference surface (for example, a floor surface or a placement surface of the placement region) onto the placement region. It means the height (absolute height) to the top surface of each article. The first recognition unit 26A detects the position of the front edge Ms (see FIG. 1) of each article M based on the data acquired by the first sensor 25A. The front edge Ms of each article M is an edge on the downstream side of the article M in the conveying direction of the article M (edge facing toward the downstream side). For example, the front edge portion Ms is an edge portion on the −X direction side among the edge portions that define the contour of the top surface Ma of the article M. In another aspect, the front edge portion Ms is an edge portion that defines a part of the contour of the end surface (front surface) Mf of the article M facing the downstream side in the transport direction. The front edge portion Ms is an example of “an end portion on the downstream side of the article in the transport direction”. In addition, the said edge part is not limited to the edge part which has a corner | angular part, The edge part which has roundness may be sufficient. The term “the downstream end of the article in the conveying direction” as used in the present application means a portion of the article that is located on the most downstream side in the conveying direction.

On the other hand, the second detection unit 14B detects the lower end portion of the article M pulled up by the holding unit 13 and the surrounding information. Specifically, as shown in FIG. 3, the second detection unit 14B includes a second sensor 25B and a second recognition unit 26B.

The second sensor 25B includes a second image acquisition unit 27B that acquires image data of a plurality of articles M. The second sensor 25B is, for example, a camera that is provided at the base (root) of the arm 12 and photographs the first placement region S1 from obliquely above (see FIG. 1). The second sensor 25B takes a picture of a plurality of stacked articles M with a visual field in the horizontal direction. Similar to the first sensor 25A, the second sensor 25B is, for example, an infrared dot pattern projection type camera. The second sensor 25B may be an optical camera, or may be a sensor other than the camera. For example, if the second sensor 25B is installed so that the angle of view is slightly downward, and the entire arrangement of the plurality of articles M can be acquired by the second sensor 25B, the first sensor 25A may be omitted.

Similar to the first recognition unit 26A, the second recognition unit (second analysis unit) 26B is realized by a part of circuits included in the circuit board 31 described later. For example, the second recognition unit 26 B is a software function unit that is realized when a processor such as a CPU executes a program stored in the memory of the circuit board 31. Alternatively, the second recognition unit 26B may be realized by hardware such as an LSI, ASIC, or FPGA mounted on the circuit board 31. The second functional unit 26B may be realized by a combination of a software functional unit and hardware. The second recognition unit 26B detects the position of the bottom (bottom) Mb (see FIG. 9) of the article M pulled up by the holding unit 13 based on the data acquired by the second sensor 25B. Further, the second recognizing unit 26B determines the positional relationship between the position of the bottom (bottom) Mb of the article M pulled up by the holding unit 13 and the article M positioned around the article M based on the data acquired by the second sensor 25B. To detect. The “bottom surface” as used in the present application means the lower surface at the lowest position in the article M. The “bottom surface” in the present application is not limited to a geometric plane. The “bottom surface” referred to in the present application may be a curved surface or a surface having unevenness. Further, the “bottom side” in the present application means a side that defines the outline of the bottom surface of the article M.
For example, when the operation of pulling up the article M is performed by the holding unit 13, the second recognizing unit 26 B is data related to the specified (set) absolute height based on real-time data acquired by the second sensor 25 B. Monitor changes. The second recognizing unit 26B is configured such that, for example, the three-dimensional observation data acquired by the second sensor 25B is discontinuous, so that the bottom side (bottom surface) Mb of the article M pulled up by the holding unit 13 is greater than the specified absolute height. Also detects that it has moved upwards.

The control unit (control circuit) 15 controls the overall operation of the transport apparatus 1. That is, the control unit 15 controls various operations of the arm 12, the holding unit 13, and the detection unit 14. As shown in FIG. 3, the control unit 15 is realized by all or part of a circuit board (control board) 31 including a processor such as a CPU. For example, the control unit 15 is a software function unit that is realized when a processor such as a CPU executes a program stored in the memory of the circuit board 31. Alternatively, the control unit 15 may be realized by hardware such as LSI, ASIC, or FPGA mounted on the circuit board 31. The control unit 15 may be realized by a combination of a software function unit and hardware. The first recognizing unit 26A, the second recognizing unit 26B, and the control unit 15 may be realized by a single chip component, or may be separately realized by two or more chip components.

The control unit 15 moves the holding unit 13 by controlling the arm 12. For example, the control unit 15 causes the holding unit 13 to approach the first placement region S1 along the + X direction. Further, the control unit 15 holds the article M by the holding unit 13 by controlling the holding unit 13. The control unit 15 pulls up the article M held by the holding unit 13 in the −Z direction by controlling the arm 12 in a state where the holding unit 13 and the article M can be regarded as one body. Then, the control unit 15 takes out the article M from the first placement area S1 by moving the holding unit 13 in the −X direction. The control unit 15 includes a selection unit 15a, an obstacle detection unit 15b, a calculation unit 15c, and a moving direction determination unit 15d as functional units related to the control of the arm 12. The functions of the selection unit 15a, the obstacle detection unit 15b, the calculation unit 15c, and the movement direction determination unit 15d will be described in the following description of the transport method.

Here, after holding the article M by the holding unit 13, the control unit 15 according to the present embodiment performs an avoidance operation on the obstacle present in the first placement area S1. The control unit 15 of the present embodiment uses the information acquired by the information acquisition unit (for example, the detection unit 14) to determine whether the first article and the second article on the projection plane viewed in a direction substantially parallel to the conveyance direction of the article M. A holding unit that holds the first article based on an overlapping width in the first direction and an overlapping width in the second direction that intersects the first direction of the first article and the second article on the projection plane. 13 movement directions are determined. Hereinafter, an example of the conveyance method of the article | item M including this avoidance operation | movement is demonstrated. Note that the configuration of the present embodiment is not limited to the following example.

FIG. 4 is a flowchart illustrating an example of the transport method according to the present embodiment.
As illustrated in FIG. 4, the selection unit 15 a of the control unit 15 first selects an extraction target article (holding target article, gripping target article) OM held by the holding unit 13 (step S 11). In other words, the selection unit 15a of the control unit 15 uses the plurality of articles M (first placement area) detected by the detection unit 14 based on the detection result of the detection unit 14 (recognition information that recognizes the positions of the plurality of articles M). The article to be taken out OM is selected from among the plurality of articles M) placed in S1. The “detection result of the detection unit 14” referred to in the present application is an example of “information acquired by the information acquisition unit”. The take-out object OM is an example of a “first article”. The “removal target article” in the present application means an article having the highest priority (transport priority) to be taken out by the transport device 1 at a certain point in time. In the present embodiment, the selection unit 15a of the control unit 15 selects the article M having the top surface Ma at the highest position among the plurality of articles M detected by the detection unit 14 as the extraction target article OM. As used herein, “having a top surface at a certain height” refers to a certain height relative to a preset reference surface (for example, a floor surface or a mounting surface of a mounting area). It means that the face is located. Based on the detection result of the detection unit 14, the selection unit 15 a of the control unit 15 calculates a region (holdable portion) that can be held by the holding unit 13 in the surface of the article OM to be taken out. Determine the target position. In some of the drawings described below, the take-out target article OM is hatched for convenience of explanation.

Next, the obstacle detection unit 15b of the control unit 15 detects an obstacle with respect to the removal target article OM (step S12). That is, the obstacle detection unit 15b of the control unit 15 detects the presence or absence of an obstacle that should avoid contact in the transport of the take-out target article OM based on the detection result of the detection unit 14. The “obstacle” referred to in the present application refers to a plurality of articles M detected by the first detection unit 14A in addition to a part of the members forming the first placement area S1 (for example, the car frame of the box pallet BP). Among these, the articles M that are not selected as the articles to be taken out OM are included. In other words, the article M that overlaps (interfers with) the take-out target article OM in the conveyance direction of the article M corresponds to an example of an obstacle.

Here, FIG. 5 shows an example of the obstacle check area 41 set by the obstacle detector 15b of the controller 15. Note that (a) in FIG. 5 shows a case where there is no member other than the article M as an obstacle. On the other hand, (b) in FIG. 5 includes members (for example, poles P1 and P2 which are part of the cage frame of the box pallet BP) in addition to the article M in the first placement area S1. Show the case.

As shown in FIG. 5, the obstacle detection unit 15b of the control unit 15 sets a check area 41 as an area for detecting the presence or absence of an obstacle. The check area 41 is an example of a “peripheral area” of the take-out target article OM. The check area 41 includes a front area (first area) 41a, a left area (second area) 41b, and a right area (third area) 41c.

In the example shown in FIG. 5A, the check area 41 covers substantially the entire first placement area S1 in the + Y direction and the −Y direction. In this example, the front area 41a is located between the −X direction side end face (front surface) Mf of the take-out target article OM and the −X direction side end part (front end part) of the first placement area S1. . On the other hand, the left region 41b is located between the end surface (left side surface) on the −Y direction side of the article OM to be taken out and the end portion (left end portion) on the −Y direction side of the first placement region S1. The right region 41c is located between the end surface (right side surface) on the + Y direction side of the article OM to be taken out and the end portion (right end portion) on the + Y direction side of the first placement region S1. Each of the left region 41b and the right region 41c includes an end portion (front end portion) on the −X direction side of the first placement region S1 and an end surface (rear surface) on the + X direction side of the article OM to be taken out in the + X direction. ) To the position corresponding to.

On the other hand, in the example shown in FIG. 5B, the first placement area S1 has a pair of poles P1 and P2 of the box pallet BP as an obstacle to the take-out target article OM. The pair of poles P1 and P2 are separately located at both ends in the + Y direction and the −Y direction at the −X direction side end of the first placement region S1. The poles P1 and P2 include a portion positioned above the top surface Ma of the article OM to be taken out. The check area 41 is set to a size that does not include a pole closer to the take-out target article OM and a pole far from the take-out target article OM among the pair of poles P1 and P2. In this example, the front area 41a is located between the −X direction side end face (front surface) Mf of the take-out target article OM and the −X direction side end part (front end part) of the first placement area S1. . The left region 41b is a region from the end surface (left side surface) on the −Y direction side of the extraction target article OM to a predetermined distance or the end surface (left side surface) on the −Y direction side of the extraction target article OM and the first area. This is the smaller one of the regions extending between the end portion (left end portion) on the −Y direction side of the mounting region S1. Further, the right region 41c is a region from the + Y direction side end surface (right side surface) of the take-out target article OM to a predetermined distance, or the + Y direction side end face (right side face) of the take-out target article OM and the first side. This is the smaller one of the regions extending from the + Y direction side end (right end) of the mounting region S1. The sizes of the left region 41b and the right region 41c of the check region 41 are appropriately set based on the size of the article M placed in the first placement region S1. Each of the left region 41b and the right region 41c has, in the + X direction, an end portion (front end portion) on the −X direction side of the first placement region S1 and an end surface (rear surface) on the + X direction side of the article OM to be taken out. It extends between corresponding positions.

It should be noted that a member that becomes an obstacle, such as a pole or a fall prevention fence, can be detected by the same detection unit as the detection unit that detects the article M (for example, the detection unit 14). In this case, there may be a state where the detection range limit of the detection unit is exceeded and the pole top surface cannot be captured, but for example, when a detection target exists at the upper edge of the detection range, this is simply made infinite. By defining as being above, it is registered as the highest article (obstacle), and easily compared with other articles (for example, the article OM to be transported or the article M to be an obstacle). Alternatively, obstacles such as poles and fall prevention fences are detected by using member information including the height of the top surface registered in a database (for example, database DB, see FIG. 22) in advance. May be.

In other words, as shown in FIG. 5, the front area 41a is located in the transport direction of the take-out object OM with respect to the take-out object OM. The left area 41b and the right area 41c are located on both sides of the take-out target article OM and on both sides of the front area 41a in a direction that intersects the transport direction of the take-out target article OM. The left area 41b and the right area 41c are examples of “side areas”. In the present application, the article M placed in the front area 41a, the left area 41b, and the right area 41c is referred to as a “peripheral article CM”.

As shown in FIG. 4, the obstacle detection unit 15 b of the control unit 15 selects the first and second obstacles 51 from the obstacles located in the check area 41 based on the detection result of the detection unit 14. 52 (see FIG. 6) is set (step S13). For example, the obstacle detection unit 15 b of the control unit 15 sets the article M having the top surface Ma at the highest position among the articles M (peripheral articles CM) located in the check area 41 as the first obstacle 51. Set. In other words, the obstacle detection unit 15b of the control unit 15 sets, as the first obstacle 51, the article M having the top surface Ma at a position higher than the take-out target article OM among the peripheral articles CM. The article M set as the first obstacle 51 is an example of a “second article”. In addition, the obstacle detection unit 15b of the control unit 15 detects the pole P1 (or pole P2) of the box pallet BP located in the check area 41 when the detection unit 14 detects the pole P1 (or pole P2). Set to the first obstacle 51.

Also, the obstacle detection unit 15b of the control unit 15 sets an obstacle having a top surface at the second highest position among the obstacles located in the check area 41 as the second obstacle 52. For example, the obstacle detection unit 15 b of the control unit 15 sets the article M having the top surface Ma at the next higher position than the first obstacle 51 as the second obstacle 52 in the peripheral articles CM. The article M set as the second obstacle 52 is an example of a “third article”. Further, the obstacle detection unit 15b of the control unit 15 has the top surface Ma at the highest position among the peripheral articles CM when the pole P1 (or the pole P2) is set to the first obstacle 51. The completed article M is set as the second obstacle 52. Each of the first and

second obstacles

51 and 52 has a top surface Ma at a position higher than the bottom surface Mb of the take-out target article OM.

Next, as illustrated in FIG. 4, the obstacle detection unit 15 b of the control unit 15 has at least one of the first and

second obstacles

51 and 52 in the front region 41 a based on the detection result of the detection unit 14. It is determined whether or not to perform (step S14).
Here, FIG. 6 and FIG. 7 show examples of the loaded state of the first and

second obstacles

51 and 52.
FIG. 6 shows an example in which at least one of the first and

second obstacles

51 and 52 is located in the front region 41a. For example, in FIG. 6A, the first obstacle 51 is located in the right area 41c, and the second obstacle 52 is located in the front area 41a. In FIG. 6B, the first obstacle 51 is located in the front area 41a, and the second obstacle 52 is located in the right area 41c. In FIG. 6C, both the first and

second obstacles

51 and 52 are located in the front region 41a. In FIG. 6D, the pole P2 of the box pallet BP as the first obstacle 51 is located in the left area 41b, and the second obstacle 52 is located in the front area 41a.
On the other hand, FIG. 7 shows an example in which both the first and

second obstacles

51 and 52 are not present in the front region 41a. For example, in FIG. 7A, the first obstacle 51 is located in the right region 41c, and the second obstacle 52 is located in the left region 41b. In FIG. 7B, both the first and

second obstacles

51 and 52 do not exist.

As shown in FIG. 4, when at least one of the first and

second obstacles

51 and 52 is present in the front area 41 a (step S 14: YES), the control unit 15 performs the first and second obstacles 51. , 52 is avoided. The avoidance operation will be described later. On the other hand, when both the first and

second obstacles

51 and 52 are not present in the front area 41a (step S14: NO), the obstacle detection unit 15b of the control unit 15 causes the third obstacle to be present in the front area 41a. 53 (see (a) in FIG. 7) is determined (step S15). The third obstacle 53 is, for example, an article M having a top surface Ma at a position next to the first and

second obstacles

51 and 52 among the obstacles located in the front area 41a. The third obstacle 53 has a top surface Ma at a position higher than the bottom surface Mb of the take-out target article OM.

When the 3rd obstruction 53 exists in the front area | region 41a (step S15: YES), the control part 15 sets an article lower part detection position to the height of the top | upper surface Ma of the 3rd obstruction 53 (step S16). . The “article lower part detection position” is an object for monitoring changes in the three-dimensional observation data by the second detection unit 14B. The control unit 15 sets the article lower part detection position at the height of the top surface Ma of the third obstacle 53 so that the bottom side (bottom face) Mb of the article OM to be picked up by the holding unit 13 is the third obstacle. When the top surface Ma moves above the height 53, the bottom (bottom surface) Mb of the article OM to be taken out is detected.

On the other hand, when the third obstacle 53 does not exist in the front area 41a (that is, no obstacles exist) (step S15: NO), the control unit 15 can recognize the bottom side (bottom face) of the take-out target article OM that can be recognized. An article lower detection position is set in Mb (step S17). The control unit 15 sets the article lower part detection position on the bottom (bottom) Mb of the take-out target article OM, so that when the take-out target article OM is pulled up by the holding unit 13, the bottom (bottom face) of the take-out target article OM. Mb is detected.

Next, the control unit 15 controls the arm 12 to pull up the take-out object OM held by the holding unit 13 (step S18). The control unit 15 monitors the change in the three-dimensional observation data acquired by the second detection unit 14B in real time while the operation of pulling up the take-out target article OM is performed. Then, the control unit 15 determines whether or not the bottom side (bottom surface) Mb of the take-out target article OM is detected in a predetermined sampling cycle that is set in advance, that is, whether or not there is a change in the three-dimensional observation data. (Step S19).

When the bottom side (bottom surface) Mb of the extraction target article OM is not detected (step S19: NO), the control unit 15 continues the pulling-up operation of the extraction target article OM. On the other hand, when the bottom (bottom) Mb of the extraction target article OM is detected (step S19: YES), the control unit 15 ends the lifting operation of the extraction target article OM. Then, the control unit 15 controls the arm 12 to pull out the take-out object OM from the first placement region S1. That is, the control unit 15 moves the take-out target article OM in the −X direction to take out the take-out target article OM from the first placement area S1.

Next, an avoidance operation for avoiding the

obstacles

51 and 52 will be described.
FIG. 8 is a flowchart illustrating an example of the flow of the avoidance operation.
As shown in FIG. 8, the control unit 15 first holds the take-out target article OM by controlling the arm 12 and the holding unit 13 (step S21). In this case, the control unit 15 sets the article lower part detection position at the height of the top surface Ma of the second obstacle 52, for example. The control unit 15 sets the article lower part detection position at the height of the top surface Ma of the second obstacle 52, so that the bottom (bottom) Mb of the article OM to be picked up by the holding unit 13 is the second obstacle. This can be detected when it moves above the height of the top surface Ma of 52.

Next, the control unit 15 controls the arm 12 to raise the take-out object OM held by the holding unit 13 (step S22). The control unit 15 monitors the change in the three-dimensional observation data acquired by the second detection unit 14B in real time while the operation of pulling up the take-out target article OM is performed. The control unit 15 then sets the bottom side (bottom surface) Mb of the take-out target article OM to the height of the top surface Ma of the second obstacle 52 at a predetermined sampling period set based on the detection result of the second detection unit 14B. It is determined whether or not it has been moved further upward (step S23).

When it is not detected that the base (bottom surface) Mb of the removal target article OM has moved above the height of the top surface Ma of the second obstacle 52 (step S23: NO), the control unit 15 Continue pulling up. On the other hand, when it is detected that the bottom (bottom surface) Mb of the take-out target article OM has moved above the height of the top surface Ma of the second obstacle 52 (step S23: YES), the control unit 15 then The following determination operation for determining the moving direction of the holding unit 13 is performed.

FIG. 9 is a perspective view schematically showing the avoidance operation. In addition, (a) in FIG. 9 shows the state before pulling up the article OM to be taken out. (B) in FIG. 9 shows a state in which the bottom side (bottom surface) Mb of the take-out target article OM has moved above the height of the top surface Ma of the second obstacle 52.

The calculation unit 15c of the control unit 15 is in a state where the bottom side (bottom surface) Mb of the take-out target article OM is pulled up to a height exceeding the top surface Ma of the second obstacle 52, as shown in (b) of FIG. Based on the detection result of the detection unit 14, the estimated amount A for lifting the object to be taken out OM as it is to avoid the first obstacle 51, and the object to be taken out OM in a direction away from the first obstacle 51 are substantially horizontal. A horizontal movement estimated amount B that is moved in the direction to avoid the first obstacle 51 is calculated (detected). The estimated pull-up amount A is the amount of vertical interference between the take-out target article OM and the first obstacle 51 when viewed along the + X direction. In other words, the estimated pull-up amount A is the overlap in the first direction (for example, −Z direction) of the take-out object OM and the first obstacle 51 on the projection plane viewed in the direction substantially parallel to the transport direction of the take-out object OM. It is an example of a width | variety (overlap amount, covering amount). Note that the “projection plane viewed in a direction substantially parallel to the conveyance direction” means “a projection plane substantially perpendicular to the conveyance direction”. On the other hand, the estimated horizontal movement amount B is the amount of horizontal interference between the take-out target article OM and the first obstacle 51 when viewed along the + X direction. For example, the estimated horizontal movement amount B is a movement amount that avoids the first obstacle 51 by moving the take-out object OM in a substantially horizontal direction that is substantially perpendicular to the transport direction of the take-out object OM. In other words, the estimated horizontal movement amount B is an example of an overlap width (overlap amount, covering amount) in the second direction (for example, the + Y direction or the −Y direction) of the take-out target article OM and the first obstacle 51 on the projection plane. It is. For example, the calculation unit 15c of the present embodiment calculates the pull-up estimated amount A and the horizontal movement estimated amount B by performing calculations based on the information on the first article and the information on the second article obtained by the detection unit 14, for example. To do. However, the detection of the estimated lift amount A and the estimated horizontal movement amount B by the control unit 15 is not limited to the above example. For example, the control unit 15 may recognize the estimated lift amount A and the estimated horizontal movement amount B based on the measurement results regarding the estimated increase amount A and the estimated horizontal movement amount B. For this reason, the calculation unit 15 c may be referred to as a “detection unit” or a “recognition unit”. Then, as shown in FIG. 8, the moving direction determining unit 15d of the control unit 15 compares the estimated pulling amount A and the estimated horizontal moving amount B to determine which moving amount is smaller (step S24). The movement direction determination unit 15d of the control unit 15 determines to move the holding unit 13 in the −Z direction when the estimated pull-up amount A is smaller than the horizontal movement estimation amount B. On the other hand, the movement direction determination unit 15d of the control unit 15 determines to move the holding unit 13 in the + Y direction (or −Y direction) when the estimated horizontal movement amount B is smaller than the estimated increase amount A.

More specifically, when the horizontal movement estimated amount B is larger than the pulling estimated amount A (step S24: YES), the control unit 15 controls the arm 12 so that the take-out object OM held by the holding unit 13 is controlled. Is continued (step S25). In this case, the control unit 15 avoids the first obstacle 51 by detecting, for example, the position of the bottom (bottom) Mb of the extraction target article OM by the detection unit 14 while continuing the lifting operation of the extraction target article OM. To monitor the change in the estimated pull-up amount A required to do this. That is, the control unit 15 determines whether or not the estimated pull-up amount A for avoiding the first obstacle 51 has reached zero at a preset predetermined sampling cycle (step S26). When the estimated lifting amount A has not reached zero (step S26: NO), the control unit 15 continues the lifting operation of the take-out object OM. On the other hand, when the estimated lifting amount A reaches zero (step S26: YES), the control unit 15 ends the lifting of the take-out object OM. Thereby, the avoidance operation for the first obstacle 51 is completed. Thereafter, the control unit 15 controls the arm 12 to pull out the take-out object OM from the first placement area S1. That is, the control unit 15 moves the take-out target article OM in the −X direction to take out the take-out target article OM from the first placement area S1.

On the other hand, when the estimated pull-up amount A is larger than the horizontal movement estimated amount B (step S24: NO), the control unit 15 controls the arm 12 to lift the take-out target article OM held in the holding unit 13. The operation is stopped, and the take-out target article OM is moved in a substantially horizontal direction in a direction away from the first obstacle 51 (step S27). For example, the control unit 15 moves the take-out object OM in a substantially horizontal direction that is substantially orthogonal to the conveyance direction of the take-out object OM. In this case, the control unit 15 detects, for example, the position of the side (side surface) of the take-out target article OM by the detection unit 14 while moving the take-out target article OM in a substantially horizontal direction. The change in the estimated horizontal movement amount B necessary for avoiding the change is monitored. That is, the control unit 15 determines whether or not the horizontal movement estimated amount B for avoiding the first obstacle 51 has reached zero in a predetermined sampling cycle set in advance (step S28). If the estimated horizontal movement amount B has not reached zero (step S28: NO), the control unit 15 continues the substantially horizontal movement of the take-out target article OM. On the other hand, when the estimated horizontal movement amount B reaches zero (step S28: YES), the control unit 15 ends the substantially horizontal movement of the take-out target article OM. Thereby, the avoidance operation for the first obstacle 51 is completed. Thereafter, the control unit 15 controls the arm 12 to pull out the take-out object OM from the first placement area S1. That is, the control unit 15 moves the take-out target article OM in the −X direction to take out the take-out target article OM from the first placement area S1.

10 to 12 show a specific operation example of the transport apparatus 1 of the present embodiment.
FIG. 10 shows an example in which there is no obstacle in the front area 41a of the take-out target article OM and the avoidance operation is not performed. In this example, the take-out target article OM is located, for example, in the front row of the first placement area S1 (see (a) in FIG. 10). The holding unit 13 holds the article OM to be taken out (see (b) in FIG. 10) and slightly lifts up (see (c) in FIG. 10). Then, the holding unit 13 pulls out the take-out object OM as it is in the −X direction (see (d) in FIG. 10). As a result, the take-out object OM is taken out from the first placement area S1.

FIG. 11 shows an example in which an obstacle is present in the front area 41a of the object OM to be taken out and an avoidance operation is performed. In this example, the first obstacle 51 exists in the front area 41a of the extraction target article OM, and the second obstacle 52 exists in the right area 41c of the extraction target article OM (see (a) in FIG. 11). The holding unit 13 holds the take-out object OM (see (b) in FIG. 11), and the take-out object to a position where the bottom (bottom) Mb of the take-out object OM exceeds the top surface Ma of the second obstacle 52. OM is pulled up (see (c) in FIG. 11). The control unit 15 compares the estimated lift amount A and the estimated horizontal movement amount B when the bottom side (bottom surface) Mb of the take-out object OM exceeds the top surface Ma of the second obstacle 52. In this example, since the estimated horizontal movement amount B is smaller than the estimated lifting amount A, the control unit 15 controls the arm 12 to move the take-out target article OM in the substantially horizontal direction ((d in FIG. 11 (d )reference). Accordingly, the take-out target article OM avoids the first obstacle 51. Then, the holding unit 13 pulls out the take-out object OM in the −X direction (see (e) in FIG. 11). As a result, the take-out object OM is taken out from the first placement area S1.

FIG. 12 shows a case where the first placement area S1 is formed by the box pallet BP and there is a pole P2 as an obstacle. In this example, the pole P2 as the first obstacle 51 exists in the front area 41a of the take-out target article OM, and the second obstacle 52 exists in the right area 41c of the take-out target article OM (in FIG. a)). The holding unit 13 holds the take-out object OM (see (b) in FIG. 12), and the take-out object to a position where the bottom (bottom) Mb of the take-out object OM exceeds the top surface Ma of the second obstacle 52. OM is pulled up (see (c) in FIG. 12). The control unit 15 compares the estimated lift amount A and the estimated horizontal movement amount B when the bottom side (bottom surface) Mb of the take-out object OM exceeds the top surface Ma of the second obstacle 52. In this example, since the estimated horizontal movement amount B is smaller than the estimated pulling amount A, the control unit 15 controls the arm 12 to move the take-out object OM in the substantially horizontal direction ((d in FIG. 12) )reference). Thus, the take-out target article OM avoids the pole P2 as the first obstacle 51. Then, the holding unit 13 pulls out the article OM to be taken out in the −X direction (see (e) in FIG. 12). As a result, the take-out object OM is taken out from the first placement region S1 without contacting the pole P2.

According to such a configuration, the speed of taking out the article M can be increased.
Here, as a comparative example, consider a transfer device in which the article size is registered in advance or the loading state and the article arrangement are preset in a transfer operation in a factory or a warehouse. In such a conveyance device, it is difficult to recognize an article in a random loading state or a loading state in which irregular-shaped articles are mixed. For this reason, even if it is a case where holding | maintenance is possible on the performance of the holding part holding an article | item, the taking-out operation | movement of an article | item may be stopped.

On the other hand, in the present embodiment, the transport device 1 includes a detection unit 14 (information acquisition unit) and a control unit 15. The detection unit 14 acquires at least information related to the first article (for example, the article to be taken out OM) and the second article (for example, the article M to be the first obstacle 51). When the second article is positioned in the conveyance direction of the first article with respect to the first article, the control unit 15 looks in the direction substantially parallel to the conveyance direction from the information acquired by the detection unit 14. The first article and the second article on the projected plane in the first direction overlap width (for example, the estimated lifting amount A), and the first direction of the first article and the second article on the projected plane; Determines the moving direction of the holding unit 13 holding the first article based on the overlapping width in the intersecting second direction (for example, the horizontal movement estimation amount B). For example, when the overlapping width in the first direction is smaller than the overlapping width in the second direction, the control unit 15 moves the holding unit 13 in the first direction so that the overlapping width in the second direction is the first width. When it is smaller than the overlapping width in one direction, the holding unit 13 is moved in the second direction. The determination of the moving direction of the holding unit 13 by the control unit 15 is not limited to the above example. For example, the control unit 15 determines the third direction different from the first direction and the second direction as the moving direction of the holding unit 13 based on the overlapping width in the first direction and the overlapping width in the second direction. Also good. Further, for example, even when the estimated horizontal movement amount B is larger than the estimated increase amount A, the control unit 15 does not operate when the estimated horizontal movement amount B is smaller than a preset threshold (or estimated increase amount A). And the horizontal movement estimated amount B is smaller than a preset threshold value), the holding unit 13 may be moved in the horizontal direction. From another viewpoint, when the horizontal movement estimated amount B is smaller than a preset threshold value, the control unit 15 does not perform a comparison between the pulling estimated amount A and the horizontal movement estimated amount B, and the holding unit 13 may be moved in the horizontal direction.

In the present embodiment, for example, the detection unit 14 detects the first article (for example, the object OM to be taken out) and the second article (for example, the article M to be the first obstacle 51). The control unit 15 refers to the detection result of the detection unit 14, and when the second article is located in the transport direction (for example, the −X direction) of the first article with respect to the first article, the first article Is moved in a first direction (for example, −Z direction) to avoid the second article, and a second direction that intersects the first article with the first direction (for example, an estimated lifting amount A). A second movement amount (for example, a horizontal movement estimation amount B) that moves in the (for example, + Y direction or -Y direction) and avoids the second article is calculated. The control unit 15 determines the movement direction of the holding unit 13 that holds the first article based on the comparison between the first movement amount and the second movement amount.

According to such a configuration, it is possible to perform an efficient operation of sequentially and safely and reliably taking out a plurality of randomly loaded items M. Moreover, according to the said structure, the movement amount of the articles | goods M required in order to take out the articles | goods M with respect to many kinds of articles | goods M and the complicated loading state of the articles | goods M can be decreased. As a result, the speed of taking out the article M can be increased. Moreover, according to the said structure, since the raising amount of the articles | goods M can be suppressed, the safety | security in the taking-out of the articles | goods M can further be improved. Note that the control unit 15 does not have to calculate the estimated increase amount A and the estimated horizontal movement amount B. In this case, the information acquisition unit (for example, the information acquisition unit 110 described later) of the transport apparatus 1 acquires the estimated pull-up amount A and the horizontal movement estimated amount B calculated (detected and measured) by the external device from the external device or the database. May be. And the control part 15 may determine the moving direction of the holding | maintenance part 13 based on the raising estimated amount A and the horizontal movement estimated amount B which were acquired by the information acquisition part.

In the present embodiment, the detection unit 14 detects a plurality of articles M including the first article and the second article. The first article is an article having a top surface Ma at the highest position among the plurality of articles M. The second article is an article having a top surface Ma at the highest position among a plurality of articles M among the articles located in the transport direction (for example, -X direction) of the first article with respect to the first article. It is. According to such a configuration, the first article can be taken out of the placement area S1 as it is by avoiding the second article. For this reason, by determining the moving direction of the first article that efficiently avoids the second article, the first article can be efficiently removed from the placement area S1. As a result, the speed of taking out the article M can be further increased.

In the present embodiment, the plurality of articles M detected by the detection unit 14 has the top surface Ma at a position lower than the top surface Ma of the second article and higher than the bottom surface Mb of the first article. A third article (an article to be the second obstacle 52) is included. The control unit 15 calculates, for example, the first movement amount and the second movement amount in a state where the bottom surface Mb of the first article is pulled up to a height exceeding the top surface Ma of the third article, and the first movement amount is calculated. Based on one movement amount and the second movement amount (for example, based on a comparison between the first movement amount and the second movement amount), a movement direction of the holding unit 13 that holds the first article is determined. Here, if the bottom surface Mb of the first article is pulled up to a height exceeding the top surface Ma of the third article, the first article does not contact the third article even if it is moved in a substantially horizontal direction. According to such a configuration, it is possible to determine the moving direction of the first article that efficiently avoids the two obstacles (the second article and the third article). As a result, the speed of taking out the article M can be increased. Moreover, according to such a structure, the calculation and determination of the avoidance operation | movement in which a 1st article avoids two obstructions can be simplified. Thereby, for example, even in the control unit 15 whose processing speed is not so fast, the processing time required for the calculation can be shortened. From this viewpoint, it is possible to speed up the removal of the article M.

In the present embodiment, the plurality of articles M includes a front area 41a positioned in the transport direction with respect to the first article, and both sides of the first article and the front area 41a in a direction intersecting the transport direction. It includes a plurality of peripheral articles CM placed in at least one of the side areas (left area 41b and right area 41c) located on both sides. The third article is an article M having a top surface Ma at a position higher than the second article among the plurality of peripheral articles CM. According to such a configuration, even if the first article is moved in a substantially horizontal direction by pulling up the bottom surface Mb of the first article to a height exceeding the top surface Ma of the third article, It does not touch any peripheral article CM. For this reason, calculation and determination of the avoidance operation can be further simplified. As a result, the speed of taking out the article M can be further increased.

In the present embodiment, the detection unit 14 detects an obstacle (for example, a pole P1 of the box pallet BP) including a portion higher than the top surface Ma of the second article. When the obstacle is detected by the detection unit 14 (when information related to the obstacle is acquired by the information acquisition unit), the control unit 15 replaces the first movement amount and the second movement amount with the first movement amount. A third movement amount for moving one article in the first direction to avoid the obstacle (for example, an estimated pull-up amount A for avoiding the pole P1, a first direction between the article to be taken out and the obstacle on the projection plane) And a fourth movement amount for moving the first article in the second direction to avoid the obstacle (for example, an estimated horizontal movement amount B for avoiding the pole P1, an object to be extracted on the projection plane) The overlap width of the article and the obstacle in the second direction is calculated, and based on the third movement amount and the fourth movement amount (for example, for comparison between the third movement amount and the fourth movement amount). Holding the first article) Determining a moving direction of the lifting unit 13. According to such a configuration, even when an obstacle different from the article M exists, the obstacle can be efficiently avoided by the same algorithm, and the speed of taking out the article M can be increased. Note that the control unit 15 may not calculate the estimated pull-up amount A and the horizontal movement estimated amount B for avoiding the obstacle. For example, the information acquisition unit (for example, the information acquisition unit 110 described later) of the transport device 1 uses the estimated pull-up amount A and the horizontal movement estimated amount B for avoiding obstacles calculated (detected and measured) by the external device. You may acquire from an external device or a database. And the control part 15 may determine the moving direction of the holding | maintenance part 13 based on the raising estimated amount A and the horizontal movement estimated amount B which were acquired by the information acquisition part.

The transport system 100 according to the present embodiment includes a determination unit (for example, a movement direction determination unit 15d). In the direction substantially parallel to the conveyance direction when the second article is located in the conveyance direction of the first article with respect to the first article, based on the information on the first article and the second article. A second direction in which the overlap width in the first direction of the first article and the second article on the projected projection plane intersects the first direction of the first article and the second article on the projection plane. The moving direction of the holding portion 13 holding the first article is determined based on the overlapping width of the first article. Thereby, it is possible to increase the speed of taking out the article M and improve the safety. The transport system 100 may have other functions (for example, the selection unit 15a, the obstacle detection unit 15b, and the calculation unit 15c) related to the detection unit 14 and the control unit 15.

The conveyance method of the present embodiment is substantially parallel to the conveyance direction when the second article is positioned in the conveyance direction of the first article with respect to the first article, based on information on the first article and the second article. The overlapping width in the first direction of the first article and the second article on the projection plane viewed in a different direction intersects the first direction of the first article and the second article on the projection plane. Determining the moving direction of the holding portion 13 holding the first article based on the overlapping width in the second direction. Thereby, it is possible to increase the speed of taking out the article M and improve the safety.

Next, some modified examples of the first embodiment will be described. The configuration other than that described below is the same as the configuration of the first embodiment.

(First modification)
FIG. 13 is a block diagram illustrating a system configuration of the transport apparatus 1 according to the first modification.
As shown in FIG. 13, in this modification, the first recognition unit 26A of the first detection unit 14A is provided inside a first sensor (for example, a camera) 25A. Similarly, the second recognition unit 26B of the second detection unit 14B is provided inside the second sensor (for example, camera) 25B. Also with such a configuration, the first and

second detection units

14A and 14B similar to those in the first embodiment can be realized.

(Second modification)
FIG. 14 schematically illustrates a transport method of the transport device 1 according to the second modification.
As shown in FIG. 14, in this modification, the peripheral article CM includes a first obstacle 51, a second obstacle 52, and a third obstacle 53. The first obstacle 51 is an article M having a top surface Ma at the highest position among the peripheral articles CM. When there is an obstacle such as the pole P1, the first obstacle 51 may be set to the pole P1. The second obstacle 52 is an article M having a top surface Ma at a position next to the first obstacle 51 in the peripheral article CM. The third obstacle 53 is an article M having a top surface Ma at a position higher than the second obstacle 52 in the peripheral article CM.

In the example shown in FIG. 14A, the first obstacle 51 is located in the left area 41b, and the second and

third obstacles

52 and 53 are located in the front area 41a. In the example shown in FIG. 14B, the first and

third obstacles

51 and 53 are located in the front area 41a, and the second obstacle 52 is located in the left area 41b. In the example shown in FIG. 14C, the first and

second obstacles

51 and 52 are located in the front area 41a, and the third obstacle 53 is located in the right area 41c.

In the first embodiment, the control unit 15 avoids the first obstacle 51 in a state where the bottom side (bottom face) Mb of the take-out target article OM is pulled up to a height that exceeds the top surface Ma of the second obstacle 52. A pull-up estimated amount A and a horizontal movement estimated amount B necessary for the calculation are calculated.
On the other hand, in the present modification, the control unit 15 is in a state where the bottom (bottom) Mb of the take-out target article OM is pulled up to a height exceeding the top surface Ma of the third obstacle 53 (that is, the bottom (bottom face) of the take-out target article OM ) In the state where Mb is lower than the top surface Ma of the second obstacle 52, the article OM to be taken out is moved in the first direction (for example, the −Z direction) to avoid the first and

second obstacles

51 and 52. The first movement amount (for example, the estimated lifting amount A) to be moved and the take-out target article OM are moved in a second direction (for example, the + Y direction or the −Y direction) intersecting the first direction. A second movement amount (for example, horizontal movement estimation amount B) that avoids the

objects

51 and 52 is calculated. And the control part 15 determines the moving direction of the holding | maintenance part 13 holding the taking-out object OM based on the comparison with said 1st movement amount and said 2nd movement amount.
Note that when the estimated lifting amount A is smaller than the estimated horizontal movement amount B and the lifting operation of the first article is continued, the control unit 15 sets the bottom side (bottom surface) Mb of the removal target article OM to the top of the second obstacle 52. You may perform the said determination process again in the state pulled up to the height exceeding the surface Ma.

According to such a configuration, the subsequent movement direction of the holding unit 13 is determined at the stage where the bottom side (bottom surface) Mb of the article to be taken out OM is pulled up to a height exceeding the top surface Ma of the third obstacle 53. . For this reason, there is a case where it is possible to avoid the obstacle by moving the take-out target article OM in the substantially horizontal direction at an earlier timing than in the first embodiment. Thereby, it may be possible to further speed up the removal of the article M.
In addition, paying attention to each obstacle (the fourth obstacle, the fifth obstacle,...) Having the top surface Ma at a position lower than the top surface Ma of the third obstacle 53 in the same way as described above, taking out The subsequent movement direction of the holding unit 13 may be determined every time the bottom (bottom) Mb of the target article OM is pulled up to a height that exceeds the top surface Ma of the obstacle. Even with such a configuration, it may be possible to further speed up the removal of the article M.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIGS. 15 to 17.
This embodiment is different from the first embodiment in that an article M different from the article M having the top surface Ma at the highest position may be preferentially taken out. Configurations other than those described below are the same as those in the first embodiment.

The control unit 15 according to the present embodiment is not an article M having the top surface Ma at the highest position (hereinafter referred to as the first height article 61) when the predetermined condition set in advance is satisfied. The article M having the top surface Ma at a position lower than the top surface Ma of the one-height article 61 (hereinafter referred to as the second height article 62) is selected as the article to be extracted OM. For example, the second height article 62 is a position lower than the top surface Ma of the first height article 61 at a position (region) downstream of the first height article 61 in the conveyance direction of the first height article 61. Has a top surface Ma. For example, the second height article 62 has the top surface Ma at the highest position among the plurality of articles M located downstream of the first height article 61 in the conveying direction of the first height article 61. Article M. Further, the second height article 62 has at least one exposed portion Me exposed to the outside (for example, above) at a position (region) downstream of the first height article 61 in the conveying direction of the first height article 61. (See FIG. 15). Note that “exposed to the outside” means that the upper part is not covered with another article M or the like.

For example, the second height article 62 is an article M in which the first height article 61 overlaps (or faces) the first height article 61 in the conveying direction of the first height article 61 (that is, an article positioned in the front region 41a of the first height article 61). M). The “second article (second height article) positioned downstream of the first article (first height article) in the conveyance direction of the first article (first height article)” in the present application is: The first article is not limited to an article that overlaps (faces) in the transport direction. The “second article (second height article) positioned downstream of the first article (first height article) in the conveyance direction of the first article (first height article)” refers to the first article. On the other hand, it may be a second article that is shifted in the + Y direction or the −Y direction and does not overlap (does not face) the first article in the transport direction. Hereinafter, the conveyance direction of the first height article 61 is simply referred to as “the conveyance direction”.

Next, a predetermined condition for selecting the second height article 62 as the take-out target article OM will be described.
FIG. 15 schematically shows a method for determining an article to be taken out.
(A) in FIG. 15 shows an example when the predetermined condition is not satisfied. The case where the predetermined condition is not satisfied is, for example, a case where the top surface Ma of the first height article 61 is clearly higher than the top surface Ma of the second height article 62. That is, the case where the predetermined condition is not satisfied means that the height difference H between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 is set to a predetermined height (preliminarily set). This is a case where the value is equal to or greater than a predetermined value. For example, the predetermined height is set based on the outer size of the article M registered in the transport apparatus 1 as a transport target. For example, the predetermined height is set to be approximately the same as the length of the shortest side in the outer shape of the article M registered in the conveyance device 1. For example, when a cube-shaped article M having a vertical width of 100 mm, a horizontal width of 200 mm, and a depth width of 150 mm is registered as a conveyance target, the “shortest side in the outer shape of the article” referred to in the present application refers to the vertical width, the horizontal width, and the depth width. The smallest is 100 mm. Then, when the predetermined condition is not satisfied, the control unit 15 determines the first height article 61 as the take-out target article OM to be taken out before the second height article 62. In this case, the second height article 62 is the first obstacle 51, for example.

On the other hand, (b) in FIG. 15 shows an example when the predetermined condition is satisfied. The case where the predetermined condition is satisfied is, for example, that the height difference H between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 is smaller than the predetermined height set in advance. And between the downstream end part (for example, front edge part Ms) of the 2nd height article 62 in the conveyance direction and the downstream end part (for example, front edge part Ms) of the 1st height article 61 This is a case where the distance L1 in the transport direction is longer than a predetermined length (a predetermined value set in advance). For example, the predetermined length is set based on the outer size of the article M registered in the transport apparatus 1 as a transport target. For example, the predetermined length is set to be substantially the same as the length of the shortest side in the outer shape of the article M registered in the transport device 1. Then, when the predetermined condition is satisfied, the control unit 15 determines the second height article 62 as the take-out target article OM to be taken out before the first height article 61. In this case, the article M located in the check area 41 set for the second height article 62 becomes the first obstacle 51 or the like.
The “distance L1 in the transport direction between the downstream end of the second height article 62 and the downstream end of the first height article 61 in the transport direction” is, for example, “the transport In the transport direction between the end surface (front surface) Mf of the second height article 62 facing downstream in the direction and the end surface (front surface) Mf of the first height article 61 facing downstream in the transport direction. The “distance in the transport direction” means a distance along the −X direction.

In another aspect, the control unit 15 is configured such that the height difference H between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 is smaller than the predetermined height, In addition, when the length L2 of the exposed portion Me of the second height article 62 in the transport direction is longer than a predetermined length (predetermined predetermined value), it is determined that the predetermined condition is satisfied. May be. That is, in the following description, “the distance L1 in the transport direction between the downstream end portion of the second height article 62 and the downstream end portion of the first height article 61 in the transport direction” is described. , “The length L2 of the exposed portion Me of the second height article 62 in the transport direction” may be read. In the case where the first height article 61 and the second height article 62 are adjacent to each other in the transport direction, the “length L2 of the exposed portion Me of the second height article 62 in the transport direction” is described above. Approximately the distance L1. For example, the control unit 15 recognizes the length L2 of the exposed portion Me of the second height article 62 in the transport direction based on the detection result of the detection unit 14.

The predetermined condition for selecting the second height article 62 as the take-out article OM is not limited to the above example. For example, the control unit 15 determines the height difference H between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 and the downstream side of the second height article 62 in the transport direction. Based on one of the conditions of the distance L1 in the transport direction between the end portion (for example, the front edge portion Ms) and the downstream end portion (for example, the front edge portion Ms) of the first height article 61, It may be selected as an object OM to be taken out. That is, the control unit 15 determines that the height difference H between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 is smaller than a preset height, or the conveyance The distance L1 between the downstream end portion (front edge portion Ms) of the second height article 62 in the direction and the downstream end portion (front edge portion Ms) of the first height article 61 is preset. When the length is longer than the length, the second height article 62 may be selected as the take-out article OM.

Next, a case where a plurality of second height articles 62 exist on the downstream side of the first height article 61 in the transport direction will be described. The plurality of second height articles 62 have the top surface Ma at substantially the same height, for example.

FIG. 16 schematically shows a first height article 61 and a plurality of second height articles 62.
When a plurality of second height articles 62 are detected by the detection unit 14, the control unit 15 according to the present embodiment has a central portion (for example, the first placement region S 1) among the plurality of second height articles 62. The second height article 62 closest to the center of the direction intersecting the conveyance direction of the first height article 61 is determined as the removal target article OM. Note that the direction intersecting the transport direction of the first height article 61 is, for example, the + Y direction.

FIG. 17 is a flowchart showing an example of the transport method of the present embodiment. The operation described below (the operation of selecting the take-out article OM from the first height article 61 and the second height article 62) corresponds to step S11 of the first embodiment.

As illustrated in FIG. 17, the control unit 15 first has a plurality of articles M (a plurality of articles M placed in the first placement region S1) detected by the detection unit 14 based on the detection result of the detection unit 14. Are recognized in order of height (step S31). Then, the control unit 15 recognizes the first height article 61 having the top surface Ma at the highest position among the plurality of articles M detected by the detection unit 14.

Next, based on the detection result of the detection unit 14, the control unit 15 is an area downstream of the first height article 61 in the transport direction (hereinafter, simply “an area downstream of the first height article 61”). Is checked) (step S32). Note that “check” in this application means that necessary information is acquired by analyzing information. And the control part 15 determines whether the other articles | goods M exist in the area | region of the downstream of the 1st height goods 61 based on the result of having checked the said area | region (step S33). When the article M does not exist in the downstream area of the first height article 61 (step S33: NO), the control unit 15 sets the first height article 61 as the extraction target article OM. And the control part 15 performs the process similar to the said 1st Embodiment.

On the other hand, when the article M (that is, the second height article 62) is present in the downstream area of the first height article 61 (step S33: YES), the control unit 15 is based on the detection result of the detection unit 14. Then, it is determined whether or not the difference H in height between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 is smaller than the predetermined height (step S34). When the difference H between the height Ma of the first height article 61 and the height Ma of the second height article 62 is equal to or greater than the predetermined height (step S34: NO), the control unit 15 The first height article 61 is set as the take-out article OM. And the control part 15 performs the process similar to the said 1st Embodiment.

On the other hand, when the height difference H between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 is smaller than the predetermined height, the control unit 15 performs the second operation in the transport direction. A distance L1 in the transport direction between the downstream end portion (for example, the front edge portion Ms) of the height article 62 and the downstream end portion (for example, the front edge portion Ms) of the first height article 61 is the predetermined distance. It is determined whether or not it is longer than the length (step S35). And when the distance L1 of the said conveyance direction between the downstream edge part of the 2nd height article | item 62 and the downstream edge part of the 1st height article | item 61 is below the said predetermined length (step S35: NO), the control unit 15 sets the first height article 61 to the take-out article OM. And the control part 15 performs the process similar to the said 1st Embodiment. On the other hand, when the distance L1 in the transport direction between the downstream end of the second height article 62 and the downstream end of the first height article 61 is longer than the predetermined length, the control unit 15 Determines whether there are a plurality of second height articles 62 (step S36). Note that the order in which step S34 and step S35 are performed may be reversed, or may be performed simultaneously.

When there is only one second height article 62 (step S36: NO), the control unit 15 sets the second height article 62 as the removal target article OM. And the control part 15 performs the process similar to the said 1st Embodiment. On the other hand, when there are a plurality of second height articles 62 (step S36: YES), the control unit 15 is the most in the center of the first placement region S1 among the plurality of second height articles 62. The near second height article 62 is set as the takeout article OM. And the control part 15 performs the process similar to the said 1st Embodiment.

According to such a configuration, the speed of taking out the article M can be further increased.
Here, even for a plurality of articles stacked in a complicated manner, a plurality of articles can be taken out in order by holding the article having the top surface at the highest position and sufficiently pulling it up directly above. However, it may be better to avoid lifting relatively heavy articles higher than necessary. In addition, when there is an article that has clearly popped out to the front as humans do, it is easier to speed up the removal of the article and the safety can be improved by taking out the article from the front.

Therefore, in the present embodiment, the detection unit 14 is located at a position downstream of the first article (for example, the first height article 61) and the first article in the transport direction (for example, the −X direction) of the first article. A second article (for example, second height article 62) having a top surface Ma at a position lower than the top surface Ma of the first article is detected. Based on the detection result of the detection unit 14, the control unit 15 has a height difference H between the top surface Ma of the first article and the top surface Ma of the second article smaller than a preset height, and The distance L1 in the transport direction between the downstream end portion (for example, the front edge portion Ms) of the second article and the downstream end portion (for example, the front edge portion Ms) of the first article in the transport direction. Is determined to be an object to be taken out OM to be taken out before the first article when at least one of the conditions is satisfied.

That is, for example, the control unit 15 determines whether the height difference H between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 or the downstream side of the second height article 62. The second height article 62 before the first height article 61 based on at least one of the distance L1 in the transport direction between the end of the first height article 61 and the downstream end of the first height article 61. Determine whether it is safe to remove. For example, when the height difference H between the top surface Ma of the first height article 61 and the top surface Ma of the second height article 62 is smaller than a predetermined height, the top of the second height article 62 It can be determined that the probability that the first-height article 61 is placed is small. Similarly, when the distance L1 in the transport direction between the downstream end of the second height article 62 and the downstream end of the first height article 61 is longer than a preset length, It can be determined that the probability that the first height article 61 is placed on the two-height article 62 is small. That is, in this embodiment, by using at least one of the above two conditions, it is determined with high accuracy whether it is safe to take out the second height article 62 before the first height article 61. Can do. Accordingly, by taking out the second height article 62 prior to the first height article 61, it is possible to take out all the articles M with less avoidance operation. As a result, the speed of taking out the article M can be further increased.

In another aspect, the detection unit 14 includes a first article (for example, the first height article 61) and a region downstream of the first article in the conveyance direction (for example, the −X direction) of the first article. A second article (for example, the second height article 62) having at least a part of the exposed portion Me exposed to the outside and having the top face Ma at a position lower than the top face Ma of the first article is detected. . Based on the detection result of the detection unit 14, the control unit 15 has a difference in height between the top surface Ma of the first article and the top surface Ma of the second article smaller than a preset height, and When at least one of the conditions that the length L2 of the exposed portion Me of the second article in the transport direction is longer than a preset length is satisfied, the second article is placed before the first article. The item to be taken out OM is determined. Even with such a configuration, similarly to the above, it is possible to determine with high accuracy whether or not it is safe to take out the second height article 62 before the first height article 61. As a result, the speed of taking out the article M can be further increased.

In the present embodiment, when both of the above two conditions are satisfied, the control unit 15 determines the second article to be taken out as an object OM to be taken out before the first article. In other words, in the present embodiment, it is possible to more accurately determine whether it is safe to take out the second height article 62 before the first height article 61 by double checking using the above two conditions. Can be confirmed.

In the present embodiment, the plurality of articles M includes a third article (another second height article 62). The third article has a top surface Ma at a position downstream of the first article in the transport direction of the first article and at substantially the same height as the top surface Ma of the second article. The control unit 15 is provided between the downstream end portion (for example, the front edge portion Ms) of the third article and the downstream end portion (front edge portion Ms) of the first article in the conveyance direction of the first article. When the distance L1 in the transport direction is longer than the preset length, one of the second article and the three articles that is closer to the center of the placement region S1 is used as the second article and the third article. The item to be taken out OM to be taken out before the other of the items is determined. In other words, when the length L2 of the exposed portion Me of the third article in the transport direction is longer than the preset length, the control unit 15 places the placement area of the second article and the three articles. One near the center of S1 is determined to be an extraction target article OM to be taken out before the other of the second article and the third article.

According to such a configuration, for example, the article M located near the center of the first placement area S1 is first taken out. For this reason, the articles | goods M located near the center part of 1st mounting area | region S1 can be reduced comparatively early. If the number of articles M near the center of the first placement area S1 can be reduced, the amount of movement of the avoidance operation of the other articles M can be further reduced. As a result, the speed of taking out the article M can be further increased.

The transport method of the present embodiment includes a first article (for example, a first height article 61) and the first article positioned downstream of the first article in the transport direction (eg, −X direction) of the first article. This includes detecting a second article (for example, second article 62) having a top surface at a position lower than the top surface Ma of one article. In the transport method of the present embodiment, the height difference H between the top surface Ma of the first article and the top surface Ma of the second article is smaller than a preset height, and the transport direction The distance L1 in the transport direction between the downstream end portion (for example, the front edge portion Ms) of the second article and the downstream end portion (for example, the front edge portion Ms) of the first article is preset. Determining that the second article is to be taken out before the first article when at least one condition of being longer than the first article is satisfied.
In another aspect, the transport method according to the present embodiment includes a first article (for example, the first height article 61) and a downstream side of the first article in the transport direction (for example, the −X direction) of the first article. A second article (for example, a second height article 62) having at least a part of the exposed portion Me exposed to the outside in the region and having the top face Ma at a position lower than the top face Ma of the first article. Detecting. In the transport method of the present embodiment, the difference in height between the top surface Ma of the first article and the top surface Ma of the second article is smaller than a preset height, and in the transport direction. When at least one of the conditions that the length L2 of the exposed portion Me of the second article is longer than a preset length is satisfied, the second article is taken out before the first article. Including OM decision.
According to such a configuration, by taking out the second height article 62 before the first height article 61, it is possible to take out all the articles M with less avoidance operation. As a result, the speed of taking out the article M can be further increased.

(Third embodiment)
Next, a third embodiment will be described with reference to FIGS.
This embodiment is different from the second embodiment in that an additional determination process is performed when the second height article 62 is selected as the take-out target article OM. The configurations other than those described below are the same as those in the second embodiment.

FIG. 18 shows some examples of the loaded state of the article M.
In the example shown in FIG. 18A, a relatively thin first height article 61 is placed on a second height article 62 that is relatively long in the + X direction. On the other hand, in the example shown in FIG. 18B, the first and

second height articles

61 and 62 are arranged in the + X direction.

In the example shown in FIG. 18A, when the second height article 62 is taken out before the first height article 61, the first height article 61 falls from above the second height article 62. To do. For this reason, in the example shown to (a) in FIG. 18, the 1st height article | item 61 must be taken out before the 2nd height article | item 62. FIG. On the other hand, in the example shown in FIG. 18B, the first and

second height articles

61 and 62 are taken out by taking out the second height article 62 before the first height article 61. There are cases where time can be reduced. However, it may be difficult to discriminate between the state shown in FIG. 18A and the state shown in FIG. 18B from the image information acquired by the current three-dimensional measurement technology. . Therefore, the control unit 15 according to the present embodiment adds a further determination condition to accurately determine the state illustrated in FIG. 18A and the state illustrated in FIG. 18B.

FIG. 19 schematically shows a method for determining the loading state of the article M.
First, a first example of the determination condition will be described.
FIG. 19A shows a first example of the determination condition. In the first example, the control unit 15 is based on the image information obtained by viewing the first placement region S1 acquired by the first detection unit 14A from above, and the first height article 61 and the second height article 62. Whether or not there is a gap g between them is determined. When the gap g is detected between the first height article 61 and the second height article 62, the control unit 15 arranges the first height article 61 and the second height article 62 in the front-rear direction. It is determined that it is in a state.

Next, a second example of the determination condition will be described.
FIG. 19B shows a second example of the determination condition. In this second example, the control unit 15 has a height different from the top surface Ma of the second height article 62 based on image information obtained by viewing the plurality of articles M acquired by the second detection unit 14B from the front. It is determined whether or not the bottom surface Mb of the first height article 61 exists. That is, depending on the loading state, the lower part of the first height article 61 may be detected behind the second height article 62 in some cases. When the base (bottom surface) Mb of the first height article 61 is detected at a position lower than the height of the top surface Ma of the second height article 62, the control unit 15 detects the first height article 61 and the second height. It is determined that the article 62 is in a state of being lined up and down. The image information used in the second example is not limited to the image information obtained by viewing the plurality of articles M from the front, and may be image information obtained by viewing the plurality of articles M from the side or the rear. That is, the image information used in the second example may be image information acquired by a detection unit including a plurality of articles M in the horizontal visual field.

Next, a third example of the determination condition will be described.
Here, the transport device 1 tried to perform the lifting operation while holding the removal target article OM. However, even if the extraction target article OM is pulled up to the movable limit of the arm 12 (upward limit of the holding unit 13), the removal target article OM. May not be detected. In this case, the control unit 15 returns the take-out object OM to the original position, and sets another article M as the take-out object OM. At this time, the control part 15 preserve | saves the log | history of the goods M which tried taking out once and returned to the original position as log | history information. In the third example, the control unit 15 selects the first height article 61 and the second height article when the history information can be confirmed for the first height article 61 when selecting the takeout article OM. 62 is determined to be in a state of being lined up forward and backward.

FIG. 20 is a flowchart illustrating an example of the transport method according to the present embodiment.
In the transport method by the transport apparatus 1 of the present embodiment, step S41 in which the determination process using the above-described determination condition is performed is added between step S33 and step S34 in the transport method of the second embodiment. Since portions other than step S41 are the same as those in the transport method of the second embodiment, detailed description thereof is omitted.

As shown in FIG. 20, in the present embodiment, when the second height article 62 is detected in the downstream area of the first height article 61, the control unit 15 takes out the second height article 62. It is determined whether or not it is possible (step S41). Specifically, the control unit 15 determines whether or not the first height article 61 and the second height article 62 are arranged in the front-rear direction based on the first to third examples of the determination conditions. judge. And when it determines with the 1st height article | item 61 and the 2nd height article | item 62 being located in a line back and forth by one or more determination conditions contained in the said three examples (step S41: YES) The control unit 15 sets the second height article 62 as the take-out target article OM. On the other hand, if it is not determined that the first-height article 61 and the second-height article 62 are in the front-and-back state according to any of the determination conditions included in the three examples (step S41: NO), The control unit 15 sets the first height article 61 as the take-out target article OM.

According to such a configuration, it is possible to determine the loading state of the first height article 61 and the second height article 62 with higher accuracy than the second embodiment. Thereby, it is possible to further increase the speed of taking out the article M while further improving the reliability of the transport device 1.

Next, modified examples of the first to third embodiments will be described. In the present modification, configurations other than those described below are substantially the same as any one of the configurations of the first to third embodiments.

FIG. 21 is a side view showing the transfer apparatus 1 of the present modification. FIG. 22 is a block diagram illustrating a system configuration of the transport apparatus 1 according to this modification. In FIG. 21, the illustration of the conveyor 16 is omitted for convenience of explanation.

As shown in FIG. 22, the transport apparatus 1 of the present modification includes an information acquisition unit 110. The information acquisition unit 110 is a software function unit that is realized, for example, when a processor such as a CPU executes a program stored in the memory of the circuit board 31. Alternatively, the information acquisition unit 110 may be realized by hardware such as an LSI, ASIC, or FPGA mounted on the circuit board 31. The information acquisition unit 110 may be realized by a combination of a software function unit and hardware. The information acquisition unit 110 can be connected to the database DB through the interface 120 and wired or wireless. Note that “obtaining information” in this application includes not only actively acquiring information but also passively acquiring information.

The database DB stores information on a plurality of articles M including the first article, the second article, and the third article, and information on an obstacle (for example, a pole P). That is, the “information related to the article” referred to in the present application is not limited to information detected when the article M is transported, and may be information given in advance. For example, in the database DB, as “information related to an article”, information such as a camera image, luggage tag information, or locus information of a loading robot when an article M is loaded (for example, when an article M is collected or loaded) is stored. At least one may be included. The camera image is an image that shows the loading state of the plurality of articles M, for example, an image of a process in which the plurality of articles M are stacked. The package tag information is, for example, information stored in an IC tag (for example, RFID (Radio Frequency Identifier)) attached to each article M. The package tag information may include, for example, information indicating the size information of the article M, whether the article M is loaded at the position, or the loading order of the article M. The robot trajectory information may include information such as the position information and height information of the robot arm when each article M is loaded, and the order of the articles M loaded. The control unit 15 obtains the information as described above from the database DB through the information acquisition unit 110, so that the loading state of the plurality of articles M that are loaded and carried can be known in advance.

Here, the control unit 15 may acquire information on the article M as described above before the article M is actually carried. In this case, the control unit 15 can determine in advance the take-out order and take-out route of the article M according to the above-described rules before the article M is actually carried. Thereby, the amount of calculation performed in real time when the article M is actually taken out can be reduced, and processing can be performed more quickly. The database DB may include article destination information, article type information, and the like. In this case, the control unit 15 may change the holding release position (gripping release position) by the holding unit 13 for each destination of the article M based on the article destination information. Thereby, the article M can be transported more smoothly for each destination of the article M. Further, the control unit 15 may change the holding method of the article M by the holding unit 13 and the moving speed of the arm 12 based on the article type information. The article type information may include information such as the softness, brittleness, and weight of the article M, for example. For example, the control unit 15 may reduce the holding force of the article M by the holding unit 13 when the article M is soft or fragile. Further, the control unit 15 may slow down the moving speed of the arm 12 when the article M is soft, fragile, or heavy. Thereby, processing of article M can be made more appropriate.

Further, the information stored in the database DB is not limited to information related to the article M. The database DB may include information such as the shape of the first placement area S1, the number of area sections, the area type, and a part (for example, a fall prevention bar) S1a that becomes an obstacle when the article M is taken out.

FIG. 23 is a perspective view illustrating an example of the first placement region S1 according to a modification of the embodiment.
As shown in FIG. 23, the number of areas of the first placement area S1 is the number of divided areas S1b when the first placement area S1 is divided into a plurality of areas S1b. The area type is information indicating the type of the article M when the type of the article M placed for each area S1b is different. The portion S1a that becomes an obstacle when the article M is taken out is a portion that is located downstream of the article M in the conveyance direction of the article M. The control unit 15 determines the holding method (for example, holding force) by the holding unit 13 based on information such as the shape of the first placement area S1, the number of area sections, the area type, and the part S1a that becomes an obstacle when the article M is taken out. The movement path or movement speed of the arm 12 may be changed.

When the information acquisition unit 110 as in this modification is provided, the detection unit 14 including a sensor such as a camera may be omitted. However, by using the detection unit 14 in addition to the information acquisition unit 110, the control unit 15 can hold the holding position (gripping position) and holding force (gripping force) by the holding unit 13 based on the detection result of the detection unit 14. May be adjusted. For example, even if the article M is accurately stacked with a robot hand or the like, the posture may be slightly changed due to shaking during transportation. For example, this may occur when there are many gaps between the article M and a partition such as a wall that defines the first placement area S1. In order to cope with such a situation, the control unit 15 includes information obtained from the database DB separately from the selection of the retrieval target article M obtained by referring to the database DB and the quick determination of the retrieval trajectory. A deviation from the actual information obtained by the detection unit 14 is detected, and the holding position (gripping position) and holding force (gripping force) by the holding unit 13 are adjusted so as to correct the deviation. Thereby, more accurate conveyance becomes possible. In addition, when the detection unit 14 detects a significant posture shift (for example, load collapse) of the article M, the control unit 15 may control the alarm device to issue an alarm calling a worker. In addition, when the detection unit 14 detects a significant posture shift (for example, load collapse) of the article M, the control unit 15 can safely change the operation mode to the load collapse processing mode (for example, the low speed mode). Therefore, it is possible to perform a suitable response to each loaded state. In addition, the control unit 15 uploads the recognition information (for example, the detection result by the detection unit 14) used when the article M is taken out and the trajectory information of the arm 12 and the holding unit 13 to the database DB through the interface 120. To do. Thereby, it becomes easy to grasp the operation status of the entire transport system and to manage individual packages.

The transfer system 100 according to the present modification includes a moving direction determination unit 15d as in the first embodiment. Thereby, it is possible to increase the speed of taking out the article M and improve the safety. Note that a part or all of the transport system 100 according to the first to third embodiments and modifications is a software function unit that is realized by a program being executed by a processor such as a CPU. Alternatively, part or all of the transport system 100 may be realized by hardware such as an LSI, an ASIC, or an FPGA. Further, part or all of the transport system 100 may be realized by a combination of a software function unit and hardware. For example, a part or all of the transport system 100 may be provided independently (physically separated) from the transport device 1. For example, a part or all of the transport system 100 may be provided as a part of a distribution center management system. For example, a part or all of the transport system 100 may be provided as a system that functions via a network such as the Internet.

The transport apparatus and transport method of the first to third embodiments have been described above, but the embodiment is not limited to the above example. For example, the first direction and the second direction in which the first article avoids the second article are not limited to the substantially vertical direction and the substantially horizontal direction, and may be directions that cross each other diagonally, for example.

According to at least one embodiment described above, the transport apparatus has an information acquisition unit and a control unit. The information acquisition unit acquires information on at least the first article and the second article. The control unit overlaps the first article and the second article in the first direction on the projection plane viewed from the information acquired by the information acquisition unit in a direction substantially parallel to the conveyance direction of the first article. The moving direction of the holding unit that holds the first article is determined based on the width and the overlapping width in the second direction that intersects the first direction of the first article and the second article on the projection plane. To do. According to such a configuration, the speed of taking out the article can be increased.

Hereinafter, some examples of the transfer device and the transfer method will be additionally described.
[1] a detection unit for detecting the first article and the second article;
Referring to the detection result of the detection unit, when the second article is positioned in the transport direction of the first article with respect to the first article, the second article is moved in the first direction to move the second article. A first movement amount for avoiding the article and a second movement amount for avoiding the second article by moving the first article in a second direction intersecting the first direction are calculated, and the first movement is calculated. A control unit that determines a moving direction of a holding unit that holds the first article based on a comparison between an amount and the second movement amount;
Conveying device equipped with.
[2], [1], the transport device according to
The detection unit detects a plurality of articles including the first article and the second article,
The second article is an article having a top surface at the highest position among the plurality of articles among the articles located in the transport direction of the first article with respect to the first article.
[3], [2], the transfer device according to
The plurality of articles includes a third article having a top surface at a position lower than the top surface of the second article and higher than the bottom surface of the first article,
The control unit calculates the first movement amount and the second movement amount in a state where the bottom surface of the first article is pulled up to a height exceeding the top surface of the third article, and the first movement amount is calculated. And the movement amount of the holding unit that holds the first article is determined based on a comparison between the first movement amount and the second movement amount.
[4] The transport device according to [3],
The plurality of articles include a front area located in the transport direction with respect to the first article, and side areas located on both sides of the first article and both sides of the front area in a direction intersecting the transport direction. A plurality of peripheral articles placed on at least one of
The third article is an article having a top surface at a position higher than the second article among the plurality of peripheral articles.
[5], The transfer device according to any one of [1] to [4],
The detection unit detects an obstacle including a portion higher than the top surface of the second article,
When the obstacle is detected by the detection unit, the control unit moves the first article in the first direction instead of the first movement amount and the second movement amount, and moves the obstacle. A third movement amount to be avoided and a fourth movement amount to avoid the obstacle by moving the first article in the second direction are calculated, and the comparison between the third movement amount and the fourth movement amount is performed. The moving direction of the holding unit that holds the first article is determined based on the above.
[6] The transport apparatus according to [1],
The second article has a top surface at a position lower than the top surface of the first article at a position downstream of the first article in the transport direction,
The controller is configured such that a difference in height between the top surface of the first article and the top surface of the second article is smaller than a preset height, and the downstream side of the second article in the transport direction. When at least one of the conditions that the distance in the transport direction between the end of the first article and the downstream end of the first article is longer than a preset length is satisfied, the second article is The article to be taken out is determined to be taken out before the first article.
[7], [6] is a conveying apparatus according to
The control unit is configured such that a difference in height between the top surface of the first article and the top surface of the second article is smaller than the preset height, and the downstream side of the second article in the transport direction. The second article is taken out before the first article when the distance in the transport direction between the end of the first article and the downstream end of the first article is longer than the preset length. The article to be taken out is determined.
[8] detecting the first article and the second article;
A first movement amount that moves the first article in the first direction and avoids the second article when the second article is positioned in the transport direction of the first article relative to the first article; Calculating a second movement amount for moving the first article in a second direction intersecting the first direction and avoiding the second article;
Based on the comparison between the first movement amount and the second movement amount, a movement direction for moving the first article is determined.
Transport method.
[9] Detecting a first article and a second article having a top surface at a position lower than the top surface of the first article at a position downstream of the first article in the transport direction of the first article. A detector to perform,
Based on the detection result of the detection unit, the difference in height between the top surface of the first article and the top surface of the second article is smaller than a preset height, and the second in the transport direction. When at least one condition that the distance in the transport direction between the downstream end of the article and the downstream end of the first article is longer than a preset length is satisfied, the first A control unit for determining two articles to be taken out before the first article;
Conveying device equipped with.
[10] Detecting a first article and a second article having a top surface at a position lower than the top surface of the first article at a position downstream of the first article in the transport direction of the first article. And
The difference in height between the top surface of the first article and the top surface of the second article is smaller than a preset height, and the downstream end of the second article in the transport direction and the When at least one of the conditions that the distance in the conveyance direction between the downstream end of the first article is longer than a preset length is satisfied, the second article is made more than the first article. Decide the item to be taken out first,
Transport method.
[11] The first article and an exposed portion exposed to the outside in a region downstream of the first article in the conveying direction of the first article are at least partially exposed and more than the top surface of the first article. A detection unit for detecting a second article having a top surface at a low position;
Based on the detection result of the detection unit, the difference in height between the top surface of the first article and the top surface of the second article is smaller than a preset height, and the second in the transport direction. Control for determining the second article to be taken out before the first article when at least one condition that the length of the exposed portion of the article is longer than a preset length is satisfied And
Conveying device equipped with.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Conveyance apparatus, 13 ... Holding part, 14 ... Detection part (information acquisition part), 15 ... Control part, 16 ... Conveyor, S1 ... Loading area | region, M ... Article, Ma ... Top surface, Mb ... Bottom (bottom surface) Ms ... front edge (end), Me ... exposed portion, OM ... object to be taken out (first article), 51 ... first obstacle (second article), 52 ... second obstacle (third article) P1 ... Paul (obstacle), CM ... Peripheral article, 61 ... First height article (first article), 62 ... Second height article (second article), 100 ... Conveyance system, 110 ... Information acquisition unit , DB ... Database.

Claims

An information acquisition unit for acquiring information on at least the first article and the second article;
When the second article is positioned in the conveyance direction of the first article with respect to the first article, the information obtained by the information acquisition unit is a projection plane viewed in a direction substantially parallel to the conveyance direction. The overlapping width in the first direction of the first article and the second article, and the overlapping width in the second direction intersecting the first direction of the first article and the second article on the projection plane. A control unit for determining a moving direction of the holding unit for holding the first article,
Conveying device equipped with.
The control unit moves the holding unit in the first direction when the overlap width in the first direction is smaller than the overlap width in the second direction, and the overlap width in the second direction is the first direction. The holding part is moved in the second direction when the overlap width is smaller than
The transport apparatus according to claim 1.
The controller is
Based on the information acquired by the information acquisition unit, a calculation unit that calculates the overlap width in the first direction and the overlap width in the second direction;
A determining unit that determines the moving direction of the holding unit by comparing the overlapping width in the first direction and the overlapping width in the second direction calculated by the calculating unit;
Had
The transport apparatus according to claim 1 or 2.
The information acquisition unit acquires information on a plurality of articles including the first article and the second article,
The second article is an article having a top surface at the highest position among the plurality of articles among the articles located in the transport direction of the first article with respect to the first article.
The conveying apparatus as described in any one of Claims 1-3.
The plurality of articles includes a third article having a top surface at a position lower than the top surface of the second article and higher than the bottom surface of the first article,
In the state where the bottom surface of the first article is pulled up to a height exceeding the top surface of the third article, the control unit performs the holding based on the overlap width in the first direction and the overlap width in the second direction. Determine the direction of movement
The transport apparatus according to claim 4.
The plurality of articles include a front area located in the transport direction with respect to the first article, and side areas located on both sides of the first article and both sides of the front area in a direction intersecting the transport direction. A plurality of peripheral articles placed on at least one of
The third article is an article having a top surface at a position next to the second article among the plurality of peripheral articles.
The transport apparatus according to claim 5.
The information acquisition unit acquires information on an obstacle including a portion higher than the top surface of the second article,
When the information about the obstacle is acquired by the information acquisition unit, the control unit replaces the overlap width in the first direction and the overlap width in the second direction with the first article on the projection plane and the Determining the moving direction of the holding unit based on the overlapping width of the obstacle in the first direction and the overlapping width of the first article and the obstacle in the second direction on the projection plane;
The conveyance apparatus as described in any one of Claims 1-6.
The second article has a top surface at a position lower than the top surface of the first article at a position downstream of the first article in the transport direction,
The controller is configured such that a difference in height between the top surface of the first article and the top surface of the second article is smaller than a preset height, and the downstream side of the second article in the transport direction. When at least one of the conditions that the distance in the transport direction between the end of the first article and the downstream end of the first article is longer than a preset length is satisfied, the second article is Determine the item to be taken out before the first item,
The conveyance apparatus as described in any one of Claims 1-7.
The control unit is configured such that a difference in height between the top surface of the first article and the top surface of the second article is smaller than the preset height, and the downstream side of the second article in the transport direction. The second article is taken out before the first article when the distance in the transport direction between the end of the first article and the downstream end of the first article is longer than the preset length. Determining the item to be taken out;
The transport apparatus according to claim 8.
A conveyor for receiving the first article taken out by the holding unit and transporting the first article;
The conveying apparatus as described in any one of Claims 1-9.
From the information regarding the first article and the second article, when the second article is positioned in the conveyance direction of the first article with respect to the first article, in a projection plane viewed in a direction substantially parallel to the conveyance direction The overlapping width in the first direction of the first article and the second article, and the overlapping width in the second direction intersecting the first direction of the first article and the second article on the projection plane. A determination unit that determines a moving direction of a holding unit that holds the first article,
Conveying system equipped with.
From the information regarding the first article and the second article, when the second article is positioned in the conveyance direction of the first article with respect to the first article, in a projection plane viewed in a direction substantially parallel to the conveyance direction The overlapping width in the first direction of the first article and the second article, and the overlapping width in the second direction intersecting the first direction of the first article and the second article on the projection plane. And determining a moving direction of the holding unit for holding the first article,
Transport method.
Information on the first article and a second article having a top surface at a position lower than the top surface of the first article at a position downstream of the first article in the transport direction of the first article is acquired. An information acquisition unit;
Based on the information acquired by the information acquisition unit, a difference in height between the top surface of the first article and the top surface of the second article is smaller than a preset height, and in the transport direction When at least one condition that the distance in the conveyance direction between the downstream end of the second article and the downstream end of the first article is longer than a preset length is satisfied A control unit that determines the second article to be taken out before the first article;
Conveying device equipped with.
Information on the first article and a second article having a top surface at a position lower than the top surface of the first article at a position downstream of the first article in the transport direction of the first article is acquired. ,
The difference in height between the top surface of the first article and the top surface of the second article is smaller than a preset height, and the downstream end of the second article in the transport direction and the When at least one of the conditions that the distance in the conveyance direction between the downstream end of the first article is longer than a preset length is satisfied, the second article is made more than the first article. Decide the item to be taken out first,
Transport method.
At least part of the first article and an exposed portion exposed to the outside in a region downstream of the first article in the transport direction of the first article, and at a position lower than the top surface of the first article An information acquisition unit for acquiring information related to the second article having the top surface;
Based on the information acquired by the information acquisition unit, a difference in height between the top surface of the first article and the top surface of the second article is smaller than a preset height, and in the transport direction When at least one condition that the length of the exposed portion of the second article is longer than a preset length is satisfied, the second article is taken out as an object to be taken out before the first article. A control unit to determine;
Conveying device equipped with.