Conveying device

Abstract

To provide a conveying device advantageous for weight reduction.SOLUTION: A conveying device 100 comprises a traveling carriage 2, and a lifting device 3 which is disposed on the traveling carriage 2 and lifts up and down a cargo 12. The lifting device 3 has a support member 4 for supporting and lifting up and down the cargo 12, and a lifting mechanism 5 for lifting up and down the support member 4. The lifting mechanism 5 has a string member 52 connected to the support member 4, a winch mechanism 54 for winding / unwinding the string member 52, and movable pulleys 61, 62 and 63 which are disposed between the winch mechanism 54 and the support member 4, have the string member 52 spanned between them, and lift up and down together with the support member 4.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a conveying device.

Background Art

[0002] A transport vehicle capable of carrying a load and moving is known. For example, Patent Document 1 describes a robot track unloader in which a robot is installed on a traveling carriage and which handles luggage. This unloader includes a moving pedestal equipped with a sensor and a computer that scans an environment containing a plurality of objects, and a robot arm provided on the moving pedestal. This unloader can be used to plan a collision-free trajectory for the moving pedestal.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The inventor has obtained the following new recognition regarding the conveying device. In a conveying device for conveying a load, the practical load-carrying capacity is the original load-carrying capacity of the conveying device minus the mass of the conveying device itself. Therefore, if the conveying device itself is heavy, the load-carrying capacity will decrease by the amount of its mass, so weight reduction of the conveying device is desired. The robot track unloader described in Patent Document 1 is disadvantageous from the perspective of weight reduction because it is equipped with an expensive and heavy articulated robot.

[0005] An object of the present invention is to provide a conveying device that is advantageous for weight reduction in view of such problems.

Means for Solving the Problems

[0006] To solve the above problems, a transport device according to an aspect of the present invention is a transport device including a traveling carriage and a lifting device that is installed on the traveling carriage and holds and lifts a load. The lifting device has a support member that supports the load and a lifting mechanism that raises and lowers the support member. The lifting mechanism has a string member connected to the support member, a winch mechanism that winds and unwinds the string member, and a movable pulley that is disposed between the winch mechanism and the support member and around which the string member is passed and that moves up and down together with the support member.

[0007] In addition, any combination of the above components, or those obtained by mutually substituting the components and expressions of the present invention between methods, systems, etc., are also effective as aspects of the present invention.

Effects of the Invention

[0008] According to the present invention, it is possible to provide a transport device that is advantageous for weight reduction.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

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Figure 8

Modes for Carrying Out the Invention

[0010] Hereinafter, the present invention will be described with reference to the drawings based on preferred embodiments. In the embodiments and modifications, the same or equivalent components and members are denoted by the same reference numerals, and repeated explanations will be omitted as appropriate. In addition, the dimensions of the members in each drawing are shown enlarged or reduced as appropriate for easy understanding. Also, some of the members that are not important for explaining the embodiments in each drawing are omitted from the display.

[0011] In addition, terms including ordinal numbers such as first and second are used to describe various components, but this term is used only for the purpose of distinguishing one component from another, and the components are not limited by this term.

[0012] [Embodiment] The configuration of the transport device 100 according to the embodiment will be described with reference to the drawings. FIG. 1 is a schematic diagram showing an example of the transport device 100. FIG. 2 is a front perspective view mainly showing the framework of the support member 4 and the support frame 7 of the transport device 100. FIG. 3 is a side view showing the support frame 7. As shown by the arrows in FIGS. 1 and 2, the straight-ahead direction of the transport device 100 is referred to as "front" or "forward", the opposite direction is referred to as "rear" or "backward", the right direction in the straight-ahead direction is referred to as "right" or "rightward", and the opposite direction is referred to as "left" or "leftward". Also, the upper side in the vertical direction is referred to as "up", and the lower side is referred to as "down".

[0013] The transport device 100 is a transport device including a self-propelled traveling carriage 2 and a lifting device 3 installed on the traveling carriage 2 for holding and lifting the load 12. The transport device 100 is a transport device capable of transporting the load 12 lifted by the lifting device 3 and lowering the load 12 at the destination. For example, the transport device 100 can pick up the load 12 placed on the first shelf and lower it onto the second shelf installed in another location. In this specification, the load includes a single article to be transported, a container containing the article, an empty container, etc. In the following description, an example in which the load 12 is a container containing an article is shown. Containers etc. include containers such as trays in addition to containers.

[0014] The lifting device 3 includes a support member 4, a lifting mechanism 5, and a support frame 7. The support frame 7 is a fixed frame fixed on the traveling bogie 2. The support member 4 is a movable frame movably supported vertically with respect to the support frame 7, and includes an upper support member 41 and a lower support member 42 that support the load 12.

[0015] The support frame 7 mainly includes a base 75, column members 72, diagonal members 76, a fixed pulley support portion 77, a winch support portion 78, and a sensor support portion 79. These members of the support frame 7 can be formed, for example, from hollow pipe materials made of aluminum.

[0016] The support member 4 mainly includes a movable pulley support member 40, an upper support member 41, a lower support member 42, a vertical column 43, left and right columns 44, front and rear columns 48, and a guide member 50. These members of the support member 4 can be formed, for example, from hollow pipe materials made of aluminum.

[0017] The lifting mechanism 5 includes a string member 52 and a winch mechanism 54. The lifting mechanism 5 includes a plurality of movable pulleys 61, 62, 63 arranged in the horizontal direction, and a plurality of fixed pulleys 64, 65 arranged in the horizontal direction above the movable pulleys 61, 62, 63. In this example, they are arranged at predetermined intervals in the order of the first movable pulley 61, the first fixed pulley 64, the second movable pulley 62, the second fixed pulley 65, and the third movable pulley 63 from left to right. The movable pulleys 61, 62, 63 are rotatably attached to the movable pulley support member 40 of the support member 4. The first fixed pulley 64 and the second fixed pulley 65 are rotatably attached to the fixed pulley support portion 77 of the support frame 7. The movable pulley support member 40 and the fixed pulley support portion 77 in this example are composed of hollow pipes extending left and right.

[0018] The string member 52 is connected to the support member 4 via the movable pulleys 61, 62, and 63. The tip end portion 53 of the string member 52 is fixed to the fixed pulley support portion 77, and the base end side is wound around and unwound from the drum 56 of the winch mechanism 54. The string member 52 is passed over the first movable pulley 61, the first fixed pulley 64, the second movable pulley 62, the second fixed pulley 65, and the third movable pulley 63 in this order from the tip end side. When the string member 52 is wound around the drum 56, the movable pulleys 61, 62, and 63 approach the fixed pulleys 64 and 65, and accordingly, the support member 4 rises. When the string member 52 is unwound from the drum 56, the movable pulleys 61, 62, and 63 move away from the fixed pulleys 64 and 65, and accordingly, the support member 4 descends. That is, the movable pulleys 61, 62, and 63 move up and down together with the support member 4. The number and shape of the movable pulleys 61, 62, and 63, the fixed pulleys 64 and 65, and the form of the string member 52 can be set by experiment or simulation so as to obtain desired lifting and lowering characteristics.

[0019] The winch mechanism 54 is a rectangular parallelepiped unit and includes a motor 55, a drum 56 that is rotationally driven by the motor 55, and a drive unit 57 that drives the motor 55. Note that the shape of the winch mechanism 54 is not limited to a rectangular parallelepiped shape, and other shapes may be used. Further, the drive source of the winch mechanism 54 is not limited to a motor, and for example, a gear motor in which a motor and a speed reducer are connected may be used. The drive unit 57 controls the rotational output of the drum 56 based on a command from the control device 30. The control device 30 controls the support member 4 to move up and down between a predetermined upper position and a predetermined lower position. The state in which the support member 4 is at the predetermined upper position is referred to as the "upper position state", and the state in which the support member 4 is at the predetermined lower position is referred to as the "lower position state". The configuration of the winch mechanism 54 can be set by experiment or simulation so as to obtain desired lifting and lowering characteristics.

[0020] As described above, the lifting and lowering device 3 has a support frame 7, and the winch mechanism 54 is installed on the winch support portion 78 of the support frame 7 above the support member 4. The winch support portion 78 in this example is composed of two hollow pipes that are spaced apart in the front-rear direction and extend in the left-right direction.

[0021] The support frame 7 has a column member 72 extending in the vertical direction. The support member 4 has rollers 66 and 67 that are tangentially in contact with the column member 72. That is, the column member 72 functions as a guide rail for guiding the lifting and lowering track of the support member 4. The rollers 66 and 67 include a first roller 66 disposed on the upper side and a second roller 67 disposed below the first roller 66. The first roller 66 and the second roller 67 are rotatably attached to the front and rear columns 48 and the upper support member 41 on both the left and right sides of the support member 4, respectively. Each of the first roller 66 and the second roller 67 is composed of a pair of roller members disposed with the column member 72 sandwiched therebetween in the front and rear directions. A movable pulley support member 40 is spanned across the front and rear columns 48 on both the left and right sides.

[0022] There is no limit to the number of column members 72, but in this example, a pair of column members 72 are provided at intermediate positions in the front - rear direction or the left - right direction of the traveling bogie 2. In this case, since the number of column members 72 is small, it is advantageous for weight reduction.

[0023] The base 75 is a pipe material assembled in a quadrilateral shape in plan view and fixed to the traveling bogie 2, and supports the entire support frame 7 from below. The column member 72 is vertically provided near the front - rear center of the base 75. The diagonal member 76 is obliquely spanned between the column member 72 and the base 75 and functions as a cross - brace for supporting the lower part of the column member 72. The fixed pulley support 77 is spanned across the upper ends of the left and right column members 72. The winch support 78 is supported at the upper ends of the left and right column members 72. The sensor support 79 extends forward from near the upper ends of the left and right column members 72.

[0024] The vertical columns 43 of the support member 4 are members extending in the vertical direction, with two provided on the front side at intervals in the left - right direction and two provided on the rear side at intervals in the left - right direction. The four vertical columns 43 are arranged at the respective corners of a quadrilateral in plan view. The left - right columns 44 are members extending in the left - right direction and are spanned in the left - right direction at the upper and lower parts of the two rear vertical columns 43 and at the upper part of the two front vertical columns 43, respectively. The front - rear columns 48 are members extending in the front - rear direction and are spanned in the front - rear direction at the upper parts of the two vertically separated front - rear vertical columns 43 on the left and right sides. The movable pulley support member 40 is a member extending in the left - right direction and is spanned across the upper parts of the two front - rear columns 48 near the front - rear center.

[0025] The support member 4 has an upper support member 41 and a lower support member 42. The upper support member 41 and the lower support member 42 are integrally lifted and lowered by a single winch mechanism 54. By integrally lifting and lowering the upper support member 41 and the lower support member 42, two pieces of luggage 12 placed on the upper shelf 81 and the lower shelf 82 of the shelf unit 8 described later can be taken out simultaneously.

[0026] The upper support member 41 is a member extending in the front-rear direction and is spanned near the center of two vertical columns 43 spaced apart in the front-rear direction on the left and right sides. The lower support member 42 is a member extending in the front-rear direction and is spanned at the lower parts of two vertical columns 43 spaced apart in the front-rear direction on the left and right sides. In the example of FIG. 1, for ease of understanding, the longitudinal cross-sections of the upper support member 41 and the lower support member 42 are shown as quadrilaterals, but as shown in FIG. 2, the longitudinal cross-sections may be polygons, circles, or the like.

[0027] The luggage 12 placed on the shelves 81 and 82 may be inclined in the horizontal direction. In this case, in the process of pulling the luggage 12 into the support member 4, it is conceivable that the luggage 12 gets caught on the upper support member 41 and the lower support member 42 and cannot be pulled in smoothly. Therefore, the support member 4 of the embodiment has a guide member 50 when pulling the luggage 12 placed on the shelves 81 and 82 into the support member 4. By having the guide member 50, the inclined luggage 12 is guided by the guide member 50 and smoothly pulled into the upper support member 41 and the lower support member 42.

[0028] The guide member 50 of the embodiment is a flat plate-shaped member extending upward from the upper support member 41 and the lower support member 42 and is flat in the left-right direction. The left and right guide members 50 are arranged in parallel with each other at an interval obtained by adding a predetermined margin to the left-right width of the luggage 12. The form of the guide member 50 can be set by experiments or simulations so as to obtain a desired guiding function.

[0029] It is conceivable that the string member 52 breaks for some reason. In this case, there is a concern that the support member 4 may fall, and the load 12 supported by the support member 4 may be damaged due to the impact. Therefore, the transport device 100 of the embodiment has a buffer member 68 that receives the fallen support member 4 when the string member 52 breaks. In the example of FIG. 1, the buffer member 68 is a flat rectangular parallelepiped cushion member disposed below the vertical column 43 at a distance. The material and shape of the buffer member 68 can be set by experiments or simulations from the viewpoint of obtaining desired buffering properties.

[0030] The transport device 100 includes an upper sensor 28 disposed on a sensor support portion 79 provided on the upper part of the support frame 7, a carriage-side sensor 26 disposed on the traveling carriage 2, and a control device 30. In this example, the control device 30 is provided on the traveling carriage 2. The upper sensor 28 may have, for example, an image sensor that detects an image, an object detection sensor that detects an object, an obstacle sensor that detects an obstacle, and the like. The upper sensor 28 transmits the detection result to the control device 30. The control device 30 can be realized by, for example, a processor of a computer and a computer program.

[0031] The traveling carriage 2 will be described with reference to FIGS. 1 and 2. As an example, the traveling carriage 2 may be an AMR (Autonomous Mobile Robot), which is an autonomous mobile robot that moves autonomously to a destination. The traveling carriage 2 of the embodiment includes a vehicle body 22, wheels 24, a carriage-side sensor 26, and a control device 30. The traveling carriage 2 can move the vehicle body 22 by driving the vehicle body 22 with a wheel drive unit (not shown) including a battery, an electric motor, and the like.

[0032] The carriage-side sensor 26 may have, for example, an image sensor that detects an image, an object detection sensor that detects an object, an obstacle sensor that detects an obstacle, and the like. The carriage-side sensor 26 transmits the detection result to the control device 30.

[0033] The upper sensor 28 and the carriage-side sensor 26 can detect guiding marks attached to furniture, fixtures, etc. such as the floor, ceiling, wall, and shelf. Based on the detection results of the upper sensor 28 and the carriage-side sensor 26, the control device 30 controls the traveling operation of the traveling carriage 2, the lifting operation of the lifting mechanism 5, etc.

[0034] The traveling carriage 2 of the embodiment can generate a traveling route from the departure point to the destination and autonomously travel along the generated route. The autonomous travel of the traveling carriage 2 can be realized using an autonomous travel technology based on a known principle. As an example, the traveling carriage 2 of the embodiment autonomously travels using a control technology called SLAM (Simultaneous Localization and Mapping).

[0035] Since SLAM is a known technology, a detailed description thereof will be omitted. SLAM can simultaneously perform the self-position identification function and the map creation function of the traveling carriage 2. The map creation function is a function that acquires surrounding information on what is around through the mounted sensors and creates map information, which is a map of the surroundings, based on this surrounding information. The self-position identification function is a function that compares the map information with the stored data of information regarding a previously stored location and identifies the self-position and the self-direction on the map when the stored data and the map information match. The traveling carriage 2 can calculate the distance between itself and obstacles, landmarks, etc. around it by SLAM and control its travel so as to avoid obstacles based on the calculation results.

[0036] Also refer to FIGS. 4 - 8. FIG. 4 is a plan view showing an example of the operation of the conveying device 100. FIGS. 5 - 8 are side views showing the take-out operation of the conveying device 100. For example, the conveying device 100 can pick up the load 12 placed on the first shelf and lower it onto the second shelf installed at another location.

[0037] Referring to FIGS. 4 and 5, an example of the shelf unit 8 will be described. The shelf unit 8 includes shelves 81 and 82, a shelf support portion 83 that supports the shelves 81 and 82, and a base portion 84 that supports the shelf support portion 83. The base portion 84 is a member having a C-shaped configuration that flares in plan view and surrounds a substantially rectangular entry region 85. The shelf support portion 83 is a rod-shaped member that extends vertically from the base portion 84 at the left and right center. The shelves 81 and 82 are plate-shaped members that extend horizontally rearward from the shelf support portion 83, and the front ends are fixed to the shelf support portion 83. The shelves 81 and 82 include an upper shelf 81 and a lower shelf 82 that is disposed below and separated from the upper shelf 81. The height of the upper shelf 81 corresponds to the height of the upper support member 41, and the height of the lower shelf 82 corresponds to the height of the lower support member 42. Specifically, the upper surfaces of the shelves 81 and 82 are provided at positions lower than the upper surfaces of the upper support member 41 and the lower support member 42 in the upper position state and higher than the upper surfaces of the upper support member 41 and the lower support member 42 in the lower position state.

[0038] FIG. 4 shows the operation of the transport device 100 with respect to the shelf unit 8 having the shelf 81. FIG. 4(A) shows the transport device 100 in a state of entering the entry region 85 of the shelf unit 8, and FIG. 4(B) shows the transport device 100 in a state of leaving the shelf unit 8. The transport device 100 can advance and enter the entry region 85 of the shelf unit 8, and can retreat and exit from the shelf unit 8. Further, in a state of entering the entry region 85 of the shelf unit 8, the transport device 100 can lift and hold the load 12 placed on the shelf 81, and can lower the held load 12 onto the shelf 81.

[0039] When the front portion of the support member 4 is located rearward of the front portion of the traveling carriage 2, it is conceivable that the traveling carriage 2 interferes with the shelf unit 8 when the support member 4 enters the shelves 81 and 82. Therefore, as shown in FIG. 5, the front portion of the support member 4 of the embodiment protrudes forward of the front portion of the traveling carriage 2. In other words, the front portion of the traveling carriage 2 is retracted rearward of the front portion of the support member 4.

[0040] The unloading operation of the conveying device 100 will be described. As shown in FIG. 5, the unloading operation is an operation of lifting and holding the packages 12 placed on the shelves 81 and 82 by the upper support member 41 and the lower support member 42. In the unloading operation, as shown in FIG. 5, the conveying device 100 moves forward toward the entry area 85 as indicated by the arrow in the lower position state where the upper support member 41 and the lower support member 42 are lowered. At this time, the packages 12 are gradually drawn into the upper support member 41 and the lower support member 42 while floating from the upper surfaces of the upper support member 41 and the lower support member 42. Specifically, the packages 12 are guided by the guide member 50 and smoothly drawn between the pair of left and right upper support members 41 and between the pair of left and right lower support members 42.

[0041] Next, as shown in FIG. 6, the conveying device 100 stops running at a predetermined position within the entry area 85 and raises the upper support member 41 and the lower support member 42 as indicated by the arrow. Next, as shown in FIG. 7, the conveying device 100 raises the upper support member 41 and the lower support member 42 to the upper position state, lifts the package 12 as indicated by the arrow, and holds the package 12 in that state. Next, as shown in FIG. 8, the conveying device 100 moves backward while holding the package 12 and exits from the entry area 85 as indicated by the arrow. The above is the description of the unloading operation.

[0042] Next, the conveying device 100 that has exited from the entry area 85 travels toward another shelf unit and performs a unloading operation of lowering the package 12 onto the shelf of another shelf unit. In the unloading operation, the conveying device 100 enters the entry area of another shelf unit in the upper position state, lowers the upper support member 41 and the lower support member 42 to the lower position state, lowers the package 12 onto the shelf during the lowering process, and exits from the entry area while remaining in the lower position state. The unloading operation and the unloading operation may be alternately executed.

[0043] The features of the conveying device 100 according to this embodiment will be described. The conveying device 100 is a conveying device including a traveling carriage 2 and a lifting device 3 that is installed on the traveling carriage 2 and holds and lifts the luggage 12. The lifting device 3 includes a support member 4 that supports the luggage 12 and a lifting mechanism 5 that raises and lowers the support member 4. The lifting mechanism 5 includes a string member 52 connected to the support member 4, a winch mechanism 54 that winds and unwinds the string member 52, and moving pulleys 61, 62, 63 that are arranged between the winch mechanism 54 and the support member 4 and around which the string member 52 is passed and that move up and down together with the support member 4.

[0044] According to this configuration, since the support member 4 is raised and lowered by the winch mechanism 54 and the moving pulleys 61, 62, 63, it is more advantageous for weight reduction than in the case of using the articulated robot of Patent Document 1. Also, the configuration using the winch mechanism and the moving pulleys can reduce the manufacturing cost compared to the articulated robot. Further, since the support frame 7 and the support member 4 are mainly composed of pipe materials, it is possible to reduce the weight while ensuring the strength.

[0045] As described above, the examples of the embodiments of the present invention have been described in detail. The above-described embodiments are merely specific examples for implementing the present invention. The content of the embodiments does not limit the technical scope of the present invention, and many design changes such as changes, additions, and deletions of components are possible without departing from the idea of the invention defined in the claims. In the above-described embodiments, regarding the content for which such design changes are possible, explanations have been given with notations such as "in the embodiment" and "in the embodiment", but design changes may also be allowed for the content without such notations.

[0046] [Modification Example] Hereinafter, a modification example will be described. In the drawings and descriptions of the modification example, the same or equivalent components and members as those in the embodiment are denoted by the same reference numerals. Descriptions overlapping with those of the embodiment are appropriately omitted, and the configurations different from those of the embodiment will be mainly described.

[0047] In the above description, an example in which the two-stage upper support member 41 and the lower support member 42 are provided as members for supporting the luggage 12 has been shown, but the present invention is not limited to this. The number of stages of the member for supporting the luggage may be 1 or 3 or more.

[0048] In the above description, an example in which the upper support member 41 and the lower support member 42 are integrally lifted and lowered by a single winch mechanism 54 has been shown, but the present invention is not limited to this. For example, the upper support member and the lower support member may be separately lifted and lowered by separate winch mechanisms.

[0049] In the above description, an example in which the upper support member 41 and the lower support member 42 are rod-shaped members extending in the front-rear direction has been shown, but the present invention is not limited to this. For example, the support member may be a plate-shaped member.

[0050] In the above description, an example in which three movable pulleys are provided has been shown, but the present invention is not limited to this. The number of movable pulleys may be 1, 2, or 4 or more. Accordingly, the number of fixed pulleys may also be changed.

[0051] In the above description, an example in which the cart-side sensor 26 and the upper sensor 28 are provided has been shown, but the present invention is not limited to this. For example, only one of the cart-side sensor and the upper sensor may be provided, or a sensor different from these may be provided.

[0052] In the above description, an example in which the winch mechanism 54 is installed above the support member 4 has been shown, but the present invention is not limited to this. For example, the winch mechanism may be installed below the support member.

[0053] Each of these modifications has the same operations and effects as the embodiment.

[0054] Any combination of the above-described embodiment and the modifications is also useful as an embodiment of the present invention. The new embodiment resulting from the combination has the effects of the combined embodiment and modifications.

Explanation of Reference Numerals

[0055] 2 Traveling carriage, 3 Lifting device, 4 Support member, 5 Lifting mechanism, 7 Support frame, 12 Load, 41 Upper support member, 42 Lower support member, 50 Guide member, 52 String member, 54 Winch mechanism, 61 First movable pulley, 62 Second movable pulley, 63 Third movable pulley, 66 First roller, 67 Second roller, 68 Buffer member, 72 Column member, 81 Upper shelf, 82 Lower shelf, 100 Conveying device.

Claims

1. A conveying device comprising a traveling carriage and a lifting device installed on the traveling carriage for holding and lifting a load, The lifting device has a support member for supporting the load and a lifting mechanism for lifting the support member. The lifting mechanism has a string member connected to the support member, a winch mechanism for winding and unwinding the string member, and a movable pulley disposed between the winch mechanism and the support member, around which the string member is passed and which moves up and down together with the support member. A conveying device.

2. The lifting device has a support frame, and the winch mechanism is installed on the support frame above the support member. The conveying device according to claim 1.

3. The support frame has a column member extending in the vertical direction. The support member has a roller that rolls on the column member. The conveying device according to claim 2.

4. The support frame has a column member extending in the vertical direction, and a pair of the column members are provided at an intermediate position in the front-rear direction or the left-right direction of the traveling carriage. The conveying device according to claim 2.

5. The support member has an upper support member and a lower support member. The upper support member and the lower support member are integrally lifted by a single winch mechanism. The conveying device according to claim 1.

6. The upper support member and the lower support member are configured to be able to simultaneously take out two loads placed on an upper shelf and a lower shelf. The conveying device according to claim 5.

7. The lifting mechanism has a plurality of the movable pulleys arranged in the horizontal direction. The conveying device according to claim 1.

8. The conveying device according to claim 1, having a buffer member for receiving the dropped support member when the string member breaks.

9. The conveying device according to claim 1, having a guide member for drawing the luggage placed on the shelf into the support member when drawing it in.

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