JP2021134043A - Conveyor - Google Patents

Abstract

To provide a conveyor allowing for cost reduction by lessening the necessity of a lifter of an unmanned carrier.SOLUTION: A conveyor includes a sub-conveyor 21B that is for receiving/delivering an article W from/to an unmanned carrier 7 to load and transport an article W and comprises a conveyor body 31 and an elevator 33. The conveyor body 31 extends in a transport direction and carries the article W. The elevator 33 raises and lowers the conveyor body 31. When the conveyor body 31 is at a lower position, the unmanned carrier 7 loading an article W is allowed to enter/exit at a front of the conveyor body 31. When the conveyor body 31 is at an upper position, the unmanned carrier 7 not loading an article W is allowed to enter/exit laterally of the conveyor body 31. By raising and lowering the conveyor body 31, reception and delivery of the article W are carried out between the conveyor body 31 and the unmanned carrier 7.SELECTED DRAWING: Figure 8

Description

The present invention relates to a conveyor, particularly an automatic guided vehicle that carries articles and a conveyor that delivers articles.

Conventionally, a transport vehicle system having a warehousing conveyor, a warehousing conveyor, and a transport vehicle is known (see, for example, Patent Document 1).
The warehousing conveyor and the warehousing conveyor are provided adjacent to the automated warehouse, and the goods are stored in the automated warehouse and the goods are discharged from the automated warehouse.
The automatic guided vehicle transfers goods between the warehousing conveyor and the warehousing conveyor.
In the warehousing operation, the automatic guided vehicle carries the goods to the warehousing conveyor and transfers them, and then the warehousing conveyor carries the goods into the automated warehouse.
In the warehousing operation, the warehousing conveyor removes the goods from the automated warehouse, and then the automatic guided vehicle transfers the goods from the warehousing conveyor and leaves the warehousing conveyor.

Japanese Unexamined Patent Publication No. 2019-14583

In the above-mentioned conventional technique, when the article is transferred to and from the automatic guided vehicle in front of the conveyor, the lifter of the automatic guided vehicle raises and lowers the article in order to match the transfer level.
In that case, it was necessary to mount a lifter having a stroke of a predetermined length on all automatic guided vehicles.

An object of the present invention is to reduce the need for a lifter for an automatic guided vehicle, thereby enabling cost reduction.

Hereinafter, a plurality of aspects will be described as means for solving the problem. These aspects can be arbitrarily combined as needed.

The conveyor according to the appearance of the present invention delivers an automatic guided vehicle for carrying articles and an automatic guided vehicle, and includes a conveyor body and an elevating device.
The conveyor body extends in the transport direction, and articles are placed and transported.
The lifting device raises and lowers the conveyor body.
When the conveyor body is in the lower position, an automatic guided vehicle on which articles are placed can enter and exit from the front of the conveyor body.
When the conveyor body is in the upper position, an automatic guided vehicle on which no articles are placed can enter and exit from the side of the conveyor body.
As the conveyor body moves up and down, goods are delivered between the conveyor body and the automatic guided vehicle.

In the first example of the operation of the conveyor (warehousing operation), the automatic guided vehicle on which the article is placed enters from the front of the conveyor body in a state where the conveyor body is lowered. Then, as the conveyor body rises, the article is transferred from the automatic guided vehicle to the conveyor body. Subsequently, the automatic guided vehicle exits from the side of the conveyor body.
In the second example of the operation of the conveyor (delivery operation), the automatic guided vehicle on which no article is placed enters from the side of the conveyor body while the conveyor body is raised. Then, as the conveyor body is lowered, the article is transferred from the conveyor body to the automatic guided vehicle. Subsequently, the automatic guided vehicle exits from the front of the conveyor body.

In this conveyor, the automatic guided vehicle can be accessed from the front and side of the conveyor, so that there is no congestion due to the transfer operation of the automatic guided vehicle. This is because the place where the automatic guided vehicle enters and exits the conveyor body is different, that is, one-way traffic is possible. Further, since the automatic guided vehicle exits from the side of the conveyor and enters the next conveyor from the side, the combined operation is realized.
Further, since the conveyor body moves up and down to deliver the article to and from the automatic guided vehicle, the article can be delivered even if the automated guided vehicle does not have a lifter.

When the automatic guided vehicle on which the article is placed enters the conveyor when the conveyor body is in the lower position, at least a part of the lower surface of the article may be higher than the upper surface of the conveyor body.
If an automatic guided vehicle on which no articles are placed enters the conveyor from the side when the conveyor body is in the upper position, the upper surface of the automatic guided vehicle may be lower than the lower surface of the conveyor body.
In this conveyor, when the elevating device moves the conveyor body from the lower position to the upper position, the conveyor body hits the lower surface of the article and lifts the article.
Further, when the elevating device moves the conveyor body from the upper position to the lower position, the article on the conveyor body is lowered onto the upper surface of the automatic guided vehicle.

The elevating device may have a support frame, a suspension member, and an elevating motor.
The suspending member is supported by a support frame, and the conveyor body may be suspended.
The elevating motor may elevate the conveyor body by driving the suspension member.
This conveyor eliminates the need for pits when installing the conveyor. Further, it is not necessary to install a structure other than the pillar of the conveyor on the traveling surface of the automatic guided vehicle.

Two conveyors may be arranged side by side.
The support frame may have columns shared by two side-by-side conveyors.
In this conveyor, the distance between adjacent conveyors can be narrowed. Furthermore, since the number of parts can be reduced, the cost can be reduced.

Two conveyors may be arranged side by side.
The support frame may have columns arranged in a staggered pattern on two side-by-side conveyors.
In this conveyor, the distance between adjacent conveyors can be narrowed.

In the conveyor according to the present invention, since the article is delivered by moving the conveyor body up and down, the article can be delivered even if the automatic guided vehicle does not have a lifter.

The schematic plan view which shows the arrangement structure of the transport vehicle system which concerns on 1st Embodiment. A detailed plan view showing a partial layout configuration of the transport vehicle system. A detailed side view showing a partial arrangement configuration of a transport vehicle system. The block diagram which shows the control composition of a transport vehicle system. The schematic plan view which shows the arrangement structure of a part of a transport vehicle system. Schematic side view of the warehousing conveyor. The schematic plan view which shows the arrangement structure of a part of a transport vehicle system. Schematic side view of the warehousing conveyor. It is a schematic plan view which shows the arrangement structure of a part of a transport vehicle system. Schematic side view of the warehousing conveyor. The schematic plan view which shows the arrangement structure of a part of a transport vehicle system. Schematic side view of the delivery conveyor. Schematic side view of the delivery conveyor. The schematic plan view which shows the arrangement structure of a part of a transport vehicle system. Schematic side view of the delivery conveyor. The schematic plan view which shows the arrangement structure of a part of the transport vehicle system of 2nd Embodiment.

1. 1. 1st Embodiment (1) Overall configuration of transport vehicle system The transport vehicle system 1 will be described with reference to FIG. FIG. 1 is a schematic plan view showing an arrangement configuration of a transport vehicle system according to the first embodiment.
The automatic guided vehicle system 1 is a system that constitutes a transport system for loading and unloading an article W (an example of an article, see FIGS. 2 and 3) in an automated warehouse 3 (an example of an automated warehouse), and is a warehousing conveyor 15. It also has a warehousing conveyor 17, and a plurality of automated guided vehicles 7.
The size, shape, weight, etc. of the article W are not particularly limited, and any object may be the article W. In this embodiment, the combination of the pallet and the luggage, and only the pallet will be described as the article W.

In the following description, the first direction (arrow X) is the horizontal direction, which is the transport direction of the warehousing conveyor 15 and the warehousing conveyor 17. The second direction (arrow Y) is a horizontal direction orthogonal to the first direction, and is an arrangement direction of rows of the warehousing conveyor 15 and the warehousing conveyor 17. The third direction (arrow Z) is the vertical direction.

(2) Automated warehouse The automated warehouse 3 has a rack 9 and a stacker crane 11. The automated warehouse 3 automatically stores the article W transported by the automatic guided vehicle 7, and automatically carries out the stored article W.

In each automated warehouse 3, the racks 9 are arranged in pairs so that the first direction is the longitudinal direction and the racks 9 face each other at intervals in the second direction. The rack 9 has a plurality of loading portions in which the article W is placed and stored in the first direction and the third direction. As a result, the rack 9 can store the articles W in a matrix in the first direction and the third direction.

The stacker crane 11 travels on a traveling rail 13 extending along the first direction between racks 9 facing the second direction in each automated warehouse 3. The stacker crane 11 includes a traveling carriage that can travel along the traveling rail 13, and an elevator that can move up and down along the mast on the traveling carriage and is provided with a transfer device. The stacker crane 11 conveys the article W between the loading portion of the rack 9 and the warehousing conveyor 15 and the warehousing conveyor 17, which will be described later. The stacker crane 11 transfers (loads and unloads) the article W to the loading / unloading portion of the rack 9, the warehousing conveyor 15 and the unloading conveyor 17.

The stacker crane 11 is not particularly limited, and various known stacker cranes can be used. Examples of the stacker crane 11 include a rear hook type in which a hook is hooked on the rear end of the article W to take in, a clamp type in which both sides of the article W are sandwiched and transferred, and a fork type in which the article W is scooped up and transferred by a slide fork. Alternatively, a device such as a front hook type that hooks a hook on the front end of the article W and takes in the article W can be used.

(3) Warehousing Conveyor and Warehousing Conveyor The warehousing conveyor 15 and the warehousing conveyor 17 each have a main conveyor 21A and a sub-conveyor 21B (an example of a conveyor).
(3-1) Main Conveyor The main conveyor 21A extends in the first direction as the transport direction and is lined up in a row. The main conveyor 21A of the warehousing conveyor 15 and the main conveyor 21A of the warehousing conveyor 17 are arranged adjacent to each other in the second direction. The main conveyor 21A mounts the article W and conveys the article W along the first direction.
The type or configuration of the main conveyor 21A is not particularly limited. As the main conveyor 21A, various conveyors such as a belt conveyor, a chain conveyor, and a roller conveyor can be used.

(3-2) Sub-conveyor The sub-conveyor 21B is a conveyor for storing the article W in the automated warehouse 3 or discharging the article W from the automated warehouse 3, and the article W is transferred to and from the automatic guided vehicle 7. Will be done. The sub-conveyors 21B extend in the first direction as the transport direction and are arranged in a row. The sub-conveyor 21B is arranged at the end of the main conveyor 21A in the first direction. The sub-conveyor 21B of the warehousing conveyor 15 and the sub-conveyor 21B of the warehousing conveyor 17 are adjacent to each other in the second direction.

The sub-conveyor 21B will be described with reference to FIGS. 2 to 4. FIG. 2 is a detailed plan view showing a partial arrangement configuration of the transport vehicle system. FIG. 3 is a detailed side view showing a partial arrangement configuration of the transport vehicle system.
The sub-conveyor 21B includes a conveyor body 31 (an example of a conveyor body) and an elevating device 33 (an example of an elevating device).
The conveyor body 31 is, for example, a pair of chain conveyors. The conveyor body 31 has a transport motor 31A. The type of conveyor in the conveyor body is not limited. The lifting device 33 raises and lowers the conveyor body 31. Specifically, the elevating device 33 moves the conveyor body 31 between the upper position and the lower position (described later).

The elevating device 33 includes a support frame 41 (an example of a support frame), an elevating motor 43 (an example of an elevating motor), and a suspension member 45 (an example of a suspension member).
The support frame 41 has a structure for supporting the conveyor body 31 from above, and has four columns 41A (an example of columns) for supporting the pair of drive units 35 and other structures. The four columns 41A are arranged at the positions of the vertices of the quadrangle in a plan view, and there is a gap between the columns 41A (sides of the quadrangle). In these gaps, a connecting material or the like that normally exists in the lower part of the conveyor is not provided.
Further, the length of the gap between the two columns 41A arranged in the second direction is a length that the automatic guided vehicle 7 can pass through. Further, the length of the gap between the two columns 41A arranged in the first direction is the length that the automatic guided vehicle 7 can pass through. As a result, the automatic guided vehicle 7 can pass through the inside and outside of the sub-conveyor 21B in the front (first direction) and sideways (second direction).

Two columns 41A are shared by the two side-by-side sub-conveyors 21B. Therefore, the distance between adjacent sub-conveyors 21B (length in the second direction) can be narrowed. Furthermore, since the number of parts can be reduced, the cost can be reduced.

The elevating motor 43 and the suspension member 45 form a set to form an electric cylinder, and each set is provided corresponding to the conveyor body 31. Specifically, each set is provided in the vicinity of the middle of each conveyor body 31 in the first direction.
The elevating motor 43 is supported by a support frame 41.
The suspension member 45 suspends the conveyor body 31. The suspension member 45 is a telescopic rod connected to the elevating motor 43. The conveyor body 31 is installed so as to be movable up and down by the support column 41A and the linear guide.
In this sub-conveyor 21B, a pit is not required when installing the sub-conveyor 21B. Further, it is not necessary to install a structure other than the support column 41A on the traveling surface of the automatic guided vehicle 7.

When the conveyor body 31 is in the lower position (solid line in FIG. 3, FIG. 6, etc.), the automatic guided vehicle 7 on which the article W is placed can enter and exit from the front of the conveyor body 31. This is because the width of the automatic guided vehicle 7 when moving is shorter than the gap between the pair of columns 41A in the second direction, and both side portions of the lower surface of the article W in the second direction move above the pair of chain conveyors. Because it does. The width between the pair of chain conveyors is wider than the width of the lifting table of the automatic guided vehicle 7 (see FIG. 5).
When the conveyor body 31 is in the upper position (broken line in FIG. 3, FIG. 12, etc.), the automatic guided vehicle 7 on which the article W is not placed can enter and exit from the side of the conveyor body 31. This is because the width of the first direction when the automatic guided vehicle 7 is moving is shorter than the gap in the first direction between the pair of columns 41A, and the upper surface of the automatic guided vehicle 7 is from the lower surface of the conveyor body 31 which is a pair of chain conveyors. Because it is in a low position.
As the conveyor body 31 moves up and down, the article W is delivered between the conveyor body 31 and the automatic guided vehicle 7 (described later).

(4) Automatic guided vehicle The automatic guided vehicle 7 is an automatic guided vehicle that travels unmanned. The automatic guided vehicle 7 travels along a predetermined route R. The automatic guided vehicle 7 can transfer the article W between the warehousing conveyor 15 and the warehousing conveyor 17. As the automatic guided vehicle 7, an AGV (Automated Guided Vehicle) is used. The automatic guided vehicle 7 has, for example, an elevating table 7a.
The automatic guided vehicle 7 has a vehicle body that is guided by the route R and travels. The guidance system adopted by the automatic guided vehicle 7 is not particularly limited, and may be, for example, a magnetic guidance system, a laser guidance system, or the like. The route R can be composed of, for example, a magnetic tape (magnetic marker), a laser reflector, a rail, or the like.

The route R is formed in a grid pattern. Route R extends through the sub-conveyor 21B.
The route R has, for example, a one-way route R1. In the one-way route R1, for example, the automatic guided vehicle 7 enters the sub-conveyor 21B of the warehousing conveyor 15 from the front to store the article W, and then moves laterally toward the sub-conveyor 21B of the warehousing conveyor 17. Furthermore, it is a route to leave the goods W by leaving the front from there.

(5) Control Configuration The control configuration of the transport vehicle system 1 will be described with reference to FIG. FIG. 4 is a block diagram showing a control configuration of the transport vehicle system.
The transport vehicle system 1 has a controller 50. The controller 50 is a computer having a processor (for example, a CPU), a storage device (for example, ROM, RAM, HDD, SSD, etc.) and various interfaces (for example, an A / D converter, a D / A converter, a communication interface, etc.). It is a system. The control unit performs various control operations by executing a program stored in the storage unit (corresponding to a part or all of the storage area of the storage device).
The controller 50 may be composed of a single processor, or may be composed of a plurality of independent processors for each control.
A part or all of the functions of each element of the controller 50 may be realized as a program that can be executed by the computer system constituting the controller 50. In addition, a part of the function of each element of the control unit may be configured by a custom IC.

The controller 50 is wirelessly or wiredly connected to the main conveyor 21A and the sub-conveyor 21B of the warehousing conveyor 15 and the warehousing conveyor 17, and controls the transportation of the article W by the warehousing conveyor 15 and the warehousing conveyor 17.
The controller 50 is wirelessly or wiredly connected to the automatic guided vehicle 7, and controls the traveling operation of the automatic guided vehicle 7.
As shown in FIG. 4, the controller 50 can transmit a drive command to the transfer motor 31A and the elevating motor 43 of the sub-conveyor 21B.

(6) Warehousing / Delivery Operation (6-1) Warehousing Operation The warehousing operation will be described with reference to FIGS. 5 to 11. 5, 7, and 9 are schematic plan views of the warehousing conveyor. 6, 8 and 10 are schematic side views showing a partial arrangement configuration of the transport vehicle system.
As shown in FIGS. 5 and 6, before the warehousing operation, the conveyor main body 31 on which the article is not placed is in the lower position in the sub-conveyor 21B of the warehousing conveyor 15. In this state, as shown in FIGS. 5 to 7, the automatic guided vehicle 7 on which the article W is placed enters from the front of the sub-conveyor 21B and slips into the lower part of the sub-conveyor 21B.

Next, as shown in FIG. 8, the elevating device 33 raises the conveyor body 31 to raise the conveyor body 31 to the upper position. As a result, the conveyor body 31 scoops up the article W, and the article W separates from the automatic guided vehicle 7.
Next, as shown in FIGS. 9 and 10, the article W is conveyed in the sub-conveyor 21B and the main conveyor 21A in the first direction. At the same time, the automatic guided vehicle 7 exits from the side of the conveyor body 31 in the second direction.

(6-2) Delivery operation The delivery operation will be described with reference to FIGS. 11 to 15. 11 and 14 are schematic plan views showing a partial arrangement configuration of the transport vehicle system. 12, 13 and 15 are schematic side views of the warehousing conveyor.
As shown in FIGS. 11 and 12, the conveyor main body 31 on which the article W is placed is in the upper position in the sub-conveyor 21B of the delivery conveyor 17 before the delivery operation.
Next, as shown in FIGS. 11 and 12, the automatic guided vehicle 7 on which the article W is not mounted enters from the side of the sub-conveyor 21B and enters the lower part of the sub-conveyor 21B.

Next, as shown in FIG. 13, the elevating device 33 lowers the conveyor body 31 to lower the conveyor body 31 to a lower position. On the way, the conveyor body 31 is placed on the article W on the automatic guided vehicle 7 and further lowered.
Finally, as shown in FIGS. 14 and 15, the automatic guided vehicle 7 exits from the front of the sub-conveyor 21B with the article W mounted on it.
When the automatic guided vehicle 7 has a lifter, the transfer time can be shortened by raising the lifter at the same time as the conveyor body 31 lowers.

(7) Effects of the Embodiment A plurality of effects of the above-described embodiment will be described. At least one of these effects may be achieved, not all.
(7-1) Congestion is unlikely to occur In this sub-conveyor 21B, the automatic guided vehicle 7 can be accessed from the front and sides of the sub-conveyor 21B. Therefore, there is no congestion caused by the transfer operation of the automatic guided vehicle 7. This is because the place where the automatic guided vehicle 7 enters the conveyor body 31 and the place where it exits are different, that is, one-way traffic is possible.
Further, the automatic guided vehicle 7 can sneak into the lower part of the sub-conveyor 21B of the warehousing conveyor 15 and can move between the lower parts of the adjacent sub-conveyors 21B. Therefore, a large number of automatic guided vehicles 7 can be efficiently and continuously operated by using the lower portion of the sub-conveyor 21B.
From the above, when the articles W are transferred between the warehousing conveyor 15 and the warehousing conveyor 17, it is possible to efficiently handle a large number of articles W by a large number of automatic guided vehicles 7. A high-capacity transport vehicle system 1 can be realized.

(7-2) Combined operation is possible The combined operation of the automatic guided vehicle 7, that is, the continuous operation of transferring the article W to the warehousing conveyor 15 and transferring the article W from the warehousing conveyor 17 is performed. It is possible to carry out the automatic guided vehicle 7 without moving it in the first direction. Specifically, in the transport vehicle system 1, on the one-way route R1, the automatic guided vehicle 7 enters the warehousing conveyor 15 and moves to the warehousing conveyor 17, and then exits from the warehousing conveyor 17.
According to this configuration, unloading on the warehousing conveyor 15 and loading on the unloading conveyor 17 by the automatic guided vehicle 7 can be continuously realized.

(7-3) The lifter of the automatic guided vehicle can be eliminated. Since the article W is delivered to and from the automatic guided vehicle 7 by moving up and down the conveyor body 31, the article W is delivered even if the automatic guided vehicle 7 does not have a lifter. Delivery of W becomes possible.

2. Second Embodiment The second embodiment will be described with reference to FIG. FIG. 16 is a schematic plan view showing a partial arrangement configuration of the transport vehicle system of the second embodiment.
Similar to the first embodiment, two sub-conveyors 21B are arranged side by side.
The support frame 41 has columns 41B arranged in a staggered manner in two side-by-side sub-conveyors 21B. That is, the columns 41B of the two support frames 41 are arranged so as to be offset in the first direction, and the columns 41B on the side closer to each other are arranged at the same position in the second direction. Therefore, the distance between adjacent sub-conveyors 21B (length in the second direction) can be narrowed.

3. 3. Features of the Embodiment The following items are common to the first embodiment and the second embodiment.
The conveyor (for example, the sub-conveyor 21B) delivers the automatic guided vehicle (for example, the automatic guided vehicle 7) and the article W on which the article (for example, the article W) is carried, and the conveyor body and the elevating device. And have.
The conveyor body (for example, the conveyor body 31) extends in the transport direction, and articles are placed and transported.
The elevating device (for example, the elevating device 33) raises and lowers the conveyor body.
When the conveyor body is in the lower position (for example, FIG. 6), an automatic guided vehicle on which articles are placed can enter and exit from the front of the conveyor body.
When the conveyor body is in the upper position (for example, FIG. 12), an automatic guided vehicle on which no article is placed can enter and exit from the side of the conveyor body.
As the conveyor body moves up and down, goods are delivered between the conveyor body and the automatic guided vehicle.
In this conveyor, the automatic guided vehicle can be accessed from the front and side of the conveyor, so that there is no congestion due to the transfer operation of the automatic guided vehicle. This is because the place where the automatic guided vehicle enters and exits the conveyor body is different, that is, one-way traffic is possible. Further, since the automatic guided vehicle exits from the side of the sub-conveyor and enters the next sub-conveyor from the side, the combined operation is realized.
Further, since the conveyor body moves up and down to deliver the article to and from the automatic guided vehicle, the article can be delivered even if the automated guided vehicle does not have a lifter.

4. Other Embodiments Although the plurality of embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the invention. In particular, the plurality of embodiments and modifications described herein can be arbitrarily combined as needed.

An automated warehouse is not essential, as the conveyor only needs to be able to transfer goods to and from an automated guided vehicle.
The configuration of the automated warehouse is not particularly limited.
The configuration and arrangement of the warehousing conveyor and the warehousing conveyor are not particularly limited.
The warehousing conveyor and the warehousing conveyor may be used in combination.
The lifting device may raise and lower not only two points, the upper position and the lower position, but also three points with the warehousing conveyor and the warehousing conveyor at higher positions.
The automatic guided vehicle may not have a lifter or may have a lifter.
The type of lifting device is not particularly limited. The lifting device may be a combination of a rotary motor and a drive mechanism (chain, belt, etc.) or a combination of a rotary motor and a linear motion mechanism (rack and pinion, ball screw mechanism, etc.).

The present invention can be widely applied to automatic guided vehicles that carry articles and conveyors that deliver articles.

1: Transport vehicle system 3: Automated warehouse 5: Conveyor 7: Automated guided vehicle 9: Rack 11: Stacker crane 13: Travel rail 15: Storage conveyor 17: Delivery conveyor 21A: Main conveyor 21B: Sub-conveyor 31: Conveyor body 33: Elevating device 41: Support frame 41A: Support column 43: Elevating motor 45: Suspension member 50: Controller W: Article

Claims (5)

An automated guided vehicle that carries goods and a conveyor that delivers goods.
A conveyor body that extends in the transport direction and carries the article on it.
An elevating device that elevates and lowers the conveyor body,
When the conveyor body is in the lower position, an automatic guided vehicle on which articles are placed can enter and exit from the front of the conveyor body.
When the conveyor body is in the upper position, an automatic guided vehicle on which no articles are placed can enter and exit from the side of the conveyor body.
A conveyor that transfers goods between the conveyor body and the automatic guided vehicle by moving the conveyor body up and down. When the automatic guided vehicle on which the article is placed enters the conveyor when the conveyor body is in the lower position, at least a part of the lower surface of the article is higher than the upper surface of the conveyor body.
When the automatic guided vehicle on which no article is placed enters the conveyor from the side when the conveyor body is in the upper position, the upper surface of the automatic guided vehicle is at a position lower than the lower surface of the conveyor body. The conveyor according to claim 1. It has a support frame that supports the conveyor body from above, a suspension member that is supported by the support frame and suspends the conveyor body, and an elevating motor that raises and lowers the conveyor body by driving the suspension member. , The conveyor according to claim 1 or 2. The conveyor
Two are arranged side by side,
The conveyor according to claim 3, wherein the support frame has a pillar shared by two side-by-side conveyors. The conveyor
Two are arranged side by side,
The conveyor according to claim 3, wherein the support frame has columns arranged in a staggered pattern in two side-by-side conveyors.

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