Transfer cart

Abstract

To provide a carriage capable of preventing falling of a roll body.SOLUTION: A carriage (1) conveys a roll body (10) formed by winding a strip member (11) on a core (12). The carriage (1) comprises a pair of roll support parts (40) for supporting both ends of the core (12), and a fixed stopper (50) disposed to each of the pair of roll support parts (40) and abutting an end face of the core (12) to regulate the movement of the roll body (10) in the axial direction.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a carrier truck for carrying a roll body.

Background Art

[0002] Conventionally, carrier trucks such as automated guided vehicles (e.g., AGV: Automated Guided Vehicle) for carrying roll bodies in factories and the like are known (see, for example, Patent Document 1). In this type of carrier truck, the roll body is supported with both ends of the core (axial center) of the roll body placed on a V-shaped receiving surface.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the above-described conventional carrier truck, when sudden braking, vibration, or the like is applied, the core may slide on the receiving surface in the axial direction, and the roll body may fall off the support portion.

[0005] The present invention has been made in view of the above circumstances, and an object thereof is to prevent the roll body from falling.

Means for Solving the Problems

[0006] The present invention is a carrier truck for carrying a roll body formed by winding a belt-like member around a core, a pair of roll support portions each having a receiving surface for supporting outer peripheral surfaces on both axial sides of the core, and a stopper member provided on each of the pair of roll support portions and contacting an end surface of the core to restrict movement of the roll body in the axial direction. The stopper member is When viewed from the axial direction,Above the receiving surface the end face of the core and At an overlapping position 、 It is configured to contact the end face of the core and restrict the axial movement of the roll body.

Advantages of the Invention

[0007] According to the present invention, the fall of the roll body can be prevented.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0010] [First Embodiment] FIG. 1 is a view showing a transport cart 1 according to the present embodiment, where (a) is a front view and (b) is a side view. As shown in FIGS. 1(a) and 1(b), the transport cart 1 according to the first embodiment is an automated guided vehicle that automatically transports the roll body 10 in, for example, a warehouse or a factory.

[0011] The roll body 10 to be conveyed is formed by winding a long strip-shaped member 11 around a core 12 in a roll shape. The strip-shaped member 11 is a film such as an optical film, paper, or the like. The core 12 is a cylindrical shaft core for winding the strip-shaped member 11. Both end portions of the core 12 in the axial direction (the direction along the central axis Ax) are formed in a cylindrical shape having a cylindrical hollow portion 12a that opens outward in the axial direction. However, the core 12 may be formed in a cylindrical shape having the hollow portion 12a over its entire length. In the following description, unless otherwise specified, the "axial direction" refers to the axial direction of the roll body 10 (core 12).

[0012] Specifically, the transport cart 1 includes a traveling body 20, a mounting portion 30, and a pair of roll support portions 40. The traveling body 20 is a cart having a plurality of wheels 21. Inside the traveling body 20, various motors for driving the wheels 21 and the mounting portion 30, a battery as a power source thereof, a control device for controlling the entire transport cart 1, etc. are mounted (all are not shown in the figure).

[0013] The mounting portion 30 is a loading platform portion disposed on the traveling body 20. The mounting portion 30 is configured to be movable in a predetermined direction with respect to the traveling body 20 in a plane orthogonal to the vertical direction. The mounting portion 30 is operationally controlled by the control device and operates, for example, to buffer the impact during sudden braking to suppress load collapse or the like.

[0014] The pair of roll support portions 40 are erected at both ends of the mounting portion 30 and horizontally support the roll body 10. In the following description, the horizontal direction parallel to the axial direction of the roll body 10 (core 12) in a state where the roll body 10 is supported by the pair of roll support portions 40 is referred to as the "front-rear direction X", and the horizontal direction orthogonal to the front-rear direction X is referred to as the "left-right direction Y".

[0015] Each roll support portion 40 has a roll receiving surface 41 for supporting the core 12 of the roll body 10 at the center of the upper surface. The roll receiving surface 41 is formed in a V-shape in a side view that opens upward, and is inclined so that the width in the left-right direction Y narrows as it goes downward. The core 12 is placed on the roll receiving surface 41 so as to extend along the front-rear direction X. By being formed in a V-shape, the roll receiving surface 41 suppresses the movement of the core 12 in its width direction. Note that the roll receiving surface 41 may be provided with irregularities (not shown) that suppress the movement (sliding) of the core 12 in the axial direction. The pair of roll support portions 40 horizontally support the roll body 10 by receiving the axial end portions of the core 12 from below at the respective roll receiving surfaces 41.

[0016] A fixed stopper (stopper member) 50 that restricts the axial movement of the roll body 10 is attached to each roll support portion 40. The fixed stopper 50 is provided on each of the V-shaped both side portions of the roll receiving surface 41 on the outer surface of each roll support portion 40 so as to protrude above the roll receiving surface 41. When the core 12 placed on the roll receiving surface 41 slides and moves in the axial direction, this fixed stopper 50 abuts against the end surface of the core 12. Thereby, the axial movement of the roll body 10 is restricted, and the roll body 10 is prevented from falling from the roll support portion 40.

[0017] As described above, according to the transport cart 1 of the first embodiment, the fixed stopper 50 that abuts against the end surface of the core 12 and restricts the axial movement of the roll body 10 is provided on each roll support portion 40. Thereby, even during sudden braking of the transport cart 1 (including starting and vibrating), the axial movement of the roll body 10 is restricted, so that the roll body 10 can be prevented from falling.

[0018] [Second Embodiment] Next, a transport cart 2 according to the second embodiment of the present invention will be described. Components common to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted. As shown in FIGS. 1(a) and 1(b), the transport cart 2 according to the second embodiment includes a movable stopper (stopper member) 60 instead of the fixed stopper 50 in the first embodiment. The movable stopper 60 is provided at the same position as the fixed stopper 50 in the first embodiment, that is, on both V-shaped sides of the roll receiving surface 41 on the outer surface of each roll support portion 40. Note that the transport cart 2 is configured in the same manner as the transport cart 1 in the first embodiment in other respects.

[0019] <Configuration of Movable Stopper> FIG. 2 is a diagram for explaining the structure of the movable stopper 60, and is a cross-sectional view taken along line A-A in FIG. 1(b). As shown in this figure, the movable stopper 60 includes a case 61 fixed to the outer surface of the roll support portion 40 and a movable member 62 supported by the case 61 so as to be movable up and down.

[0020] The movable member 62 is a contact portion that contacts the end face of the core 12 and restricts the axial movement of the core 12. The movable member 62 exposes the upper portion that contacts the core 12 from the case 61 and is configured to be movable along an obliquely up-and-down direction (hereinafter referred to as “movement direction D”) orthogonal to the roll receiving surface 41. However, this movement direction D may be a direction orthogonal to the axial direction of the roll body 10 and a direction of approaching and separating from the core 12. The movement range of the movable member 62 is a predetermined range that protrudes and retracts vertically from the roll receiving surface 41. Specifically, the movable member 62 is movable in the movement direction D between a protruding state (the state in FIG. 2) protruding above the roll receiving surface 41 and a state of being immersed (retracted) below the roll receiving surface 41.

[0021] Further, the movable member 62 is biased by a biasing spring 63 toward the upper side approaching the core 12 in the moving direction D. The biasing spring 63 is disposed between the lower side of the movable member 62 and the case 61, and normally holds the movable member 62 in a protruding state. Therefore, even when the transport cart 2 suddenly brakes or the like during the transport of the roll body 10, the movement of the roll body 10 in the axial direction is restricted by the movable member 62, and the roll body 10 is prevented from falling from the roll support portion 40.

[0022] Also, the upper surface of the movable member 62 (the upper surface in the moving direction D) is a tapered inclined surface 62a. This inclined surface 62a is inclined so as to approach the core 12 in the axial direction as it goes toward the upper side in the moving direction D. Further, the inclined surface 62a overlaps with the inner peripheral surface of the core 12 when viewed from the axial direction in the protruding movable member 62, and has a length in the moving direction D that is larger than the step between the flange portion 71 and the insertion portion 72 of the chuck 70 described later (see FIG. 3).

[0023] <Operation of the movable stopper during roll body transfer> Subsequently, the operation of the movable stopper 60 when transferring the roll body 10 from the transport cart 2 will be described. The transfer of the roll body 10 is performed, for example, by a roll transfer device between a production machine or the like that produces or processes the roll body 10 and the transport cart 2. Although not shown, the roll transfer device includes a pair of arms having chucks at their tips, and inserts the chucks into the hollow portion 12a of the core 12 from both axial sides, and in a state where the pair of arms and the roll body 10 are fixed, the pair of arms are operated to transfer the roll body 10. For details of the roll transfer device, refer to, for example, Japanese Patent No. 6203133. Here, the operation of the movable stopper 60 when the chuck of the roll transfer device is inserted into and removed from the core 12 of the roll body 10 will be described.

[0024] First, the case where the chuck 70 of the roll transfer device is inserted into the core 12 will be described. FIG. 3 is a diagram for explaining the operation of the movable stopper 60 during the transfer of the roll body 10, and is a diagram when the transfer chuck 70 is inserted into the core 12. As shown in FIG. 3(a), the chuck 70 is formed in a stepped cylindrical shape having a flange portion 71 having an outer diameter approximately equal to that of the core 12, and a substantially cylindrical insertion portion 72 provided on the tip side (core 12 side) of the flange portion 71 and inserted into the hollow portion 12a of the core 12. When inserting the chuck 70 into the core 12, with the central axes of the pair of chucks 70 aligned with the central axis Ax of the core 12, it approaches the core 12 axially from both axial sides of the core 12 (only one end portion of the core 12 is shown in FIG. 3).

[0025] Then, when the tip of the insertion portion 72 of the chuck 70 abuts against the inclined surface 62a of the movable member 62, as shown in FIG. 3(b), as the chuck 70 moves axially, the insertion portion 72 presses and moves the movable member 62 downward in the moving direction D against the biasing force of the biasing spring 63.

[0026] After that, when the chuck 70 further moves axially and the insertion portion 72 of the chuck 70 is inserted into the hollow portion 12a of the core 12, the flange portion 71 of the chuck 70 abuts against the inclined surface 62a of the movable member 62. Then, as shown in FIG. 3(c), as the chuck 70 moves axially, the flange portion 71 further presses and moves the movable member 62 downward in the moving direction D against the biasing force of the biasing spring 63. And when the insertion portion 72 is completely inserted into the core 12 until the flange portion 71 abuts against the end face of the core 12, the chuck 70 engages with the core 12. In this way, the roll transfer device transfers the roll body 10 while securely holding the core 12 from both axial sides by the pair of chucks 70.

[0027] In this manner, since the movable member 62 that restricts the movement of the roll body 10 during conveyance is configured to be movable in the moving direction D, when transferring the roll body 10, the transfer chuck 70 can be suitably inserted into the core 12 without being obstructed by the movable member 62.

[0028] Next, the case where the chuck 70 of the roll transfer device is pulled out from the core 12 will be described. FIG. 4 is a diagram for explaining the operation of the movable stopper 60 during the transfer of the roll body 10, and is a diagram when the transfer chuck 70 is pulled out from the core 12. First, when the pair of chucks 70 are inserted on both sides of the core 12 (the state of FIG. 3(c)) and the pair of chucks 70 are moved in a direction in which they are separated from each other in the axial direction (a direction away from the core 12), the one of the pair of chucks 70 with a weaker engaging force with the core 12 comes out of the core 12 first.

[0029] After that, if the engaging force between the other chuck 70 that has not come out of the core 12 and the core 12 is smaller than the static friction force between the core 12 and the roll receiving surface 41 (the force for keeping the roll body 10 stationary), the other chuck 70 also comes out of the core 12. However, if the engaging force between the other chuck 70 and the core 12 is greater than the static friction force between the core 12 and the roll receiving surface 41, the roll body 10 will be dragged by the other chuck 70 and move in the axial direction.

[0030] At this time, if the movable member 62 is not biased upward in the moving direction D, the roll body 10 may move while being dragged by the chuck 70 and fall from the roll support portion 40. In this regard, since the movable member 62 of the present embodiment is biased upward in the moving direction D by the biasing spring 63, as shown in FIG. 4(a), when the flange portion 71 of the chuck 70 is axially separated from the end face of the core 12, it moves upward in the moving direction D and enters between the flange portion 71 and the end face of the core 12.

[0031] Therefore, as shown in FIG. 4(b), even when the roll body 10 is axially moved while being dragged by the chuck 70 as it is, the movable member 62 abuts against the core 12 and the movement of the roll body 10 is restricted. Thus, since the movable member 62 is biased upward in the moving direction D, even when the transfer chuck 70 is pulled out from the core 12, the movement of the roll body 10 can be suitably restricted, and the fall of the roll body 10 from the roll support portion 40 can be prevented.

[0032] As described above, according to the transport cart 2 of the second embodiment, the movable stopper 60 (movable member 62) that abuts against the end face of the core 12 and restricts the axial movement of the roll body 10 is provided on each roll support portion 40. Thereby, even when sudden braking or the like of the transport cart 2 occurs during the transport of the roll body 10, the axial movement of the roll body 10 is restricted by the movable member 62 of the movable stopper 60, so that the fall of the roll body 10 from the roll support portion 40 can be prevented.

[0033] Further, according to the transport cart 2 of the second embodiment, the movable member 62 of the movable stopper 60 that abuts against the end face of the core 12 is configured to be movable in the moving direction D that is orthogonal to the axial direction of the roll body 10 and approaches and separates from the core 12. Thereby, during the transport of the roll body 10, while restricting the axial movement of the roll body 10 by the movable member 62 to prevent the fall of the roll body 10, during the transfer of the roll body 10, the movable member 62 can be retracted in the moving direction D to avoid interference with the chuck 70.

[0034] Further, according to the transport cart 2 of the second embodiment, the movable member 62 is biased by a biasing spring 63 toward the upper side of the moving direction D that approaches the core 12. Thereby, normally, the movable member 62 is in a protruding state that can abut against the core 12 to prevent the fall of the roll body 10 during transport, and during the transfer of the roll body 10, the movable member 62 can be retracted against the biasing force of the biasing spring 63. Also, with a simple configuration that only requires the biasing spring 63, the movable stopper 60 can be configured compactly.

[0035] Further, according to the carrier cart 2 of the second embodiment, the upper surface of the movable member 62 has an inclined surface 62a that is inclined so as to approach the core 12 in the axial direction as it goes upward in the moving direction D. Thereby, when transferring the roll body 10, the movable member 62 can be moved downward in the moving direction D as the chuck 70 that abuts against the inclined surface 62a of the movable member 62 moves in the axial direction.

[0036] [Others] As described above, the embodiments of the present invention have been described, but the present invention is not limited to the above embodiments. For example, in the second embodiment described above, the movable member 62 is biased in the moving direction D by the biasing spring 63. However, instead of this biasing spring 63, a driving means (for example, an air cylinder or a solenoid) for driving the movable member 62 along the moving direction D may be provided. In this case, the position of the chuck is detected by a sensor or the like, and based on the result, the driving means is controlled to operate by the control means, so that the movable member 62 may be moved as described above.

[0037] Further, the movable stopper 60 (movable member 62) is preferably provided in a size and position corresponding to a plurality of cores 12 having different sizes. In this case, as shown in FIG. 5, the protruding movable member 62 may be provided so as to overlap both the core 12b having the minimum diameter (hereinafter referred to as "minimum core") and the core 12c having the maximum diameter (hereinafter referred to as "maximum core") among the plurality of cores 12 when viewed from the axial direction. However, the size and position of the movable member 62 are determined in consideration of the limited arrangement space (to avoid interference with other parts) and the fact that the movability may be impaired if it is too large. Further, the protruding height h of the movable member 62 in the protruding state from the roll receiving surface 41 is set so as not to protrude too much so that the chuck 70 can preferably abut against the inclined surface 62a. Also, in this case, it is more preferable that the engagement width (engagement margin) W1 between the movable member 62 and the minimum core 12b is substantially the same as the engagement width (engagement margin) W2 between the movable member 62 and the maximum core 12c. The engagement width in this case is the length of the portion where the core 12 and the movable member 62 overlap in the axial direction in a direction orthogonal to the axial direction and parallel to the roll receiving surface 41. However, if the minimum core 12b is lighter and easier to slide, the engagement width W1 between the movable member 62 and the minimum core 12 may be made larger than the engagement width W2 between the movable member 62 and the maximum core 12c.

[0038] In addition, the details shown in the above embodiments can be appropriately changed without departing from the spirit of the invention.

Explanation of Reference Numerals

[0039] 1, 2 Transport trolley 10 Roll body 11 Belt-like member 12 Core 12a Hollow portion 12b Minimum core 12c Maximum core 40 Roll support portion 41 Roll receiving surface 50 Fixed stopper (stopper member) 60 Movable stopper (stopper member) 61 Case 62 Movable member (contact portion) 62a Inclined surface 63 Biasing spring 70 Chuck 71 Flange portion 72 Insertion portion Ax Central axis D Moving direction X Front-rear direction Y Left-right direction W1 Engagement width (with the minimum core) W2 Engagement width (with the maximum core)

Claims

1. A transport cart for transporting a roll body in which a belt-like member is wound around a core, comprising: a pair of roll support portions each having a receiving surface for supporting outer peripheral surfaces on both axial sides of the core; a stopper member provided on each of the pair of roll support portions, which abuts against an end surface of the core to restrict movement of the roll body in the axial direction; the stopper member abuts against the end surface of the core at a position overlapping the end surface of the core above the receiving surface when viewed from the axial direction, and restricts movement of the roll body in the axial direction. Transport cart.

2. The transport cart according to claim 1, wherein a contact portion of the stopper member that contacts the end surface of the core is configured to be movable in a direction orthogonal to the axial direction of the roll body and in a moving direction of approaching and separating from the core. The transport cart according to claim 1.

3. The transport cart according to claim 2, further comprising a biasing spring that biases the contact portion toward one side approaching the core in the moving direction. The transport cart according to claim 2.

4. The transport cart according to claim 2, further comprising a driving means for driving the contact portion along the moving direction. The transport cart according to claim 2.

5. Among the contact portions, a surface on one side approaching the core in the moving direction has an inclined surface inclined so as to approach the core in the axial direction as it goes toward the one side in the moving direction. The transport cart according to any one of claims 2 to 4.

6. The stopper member overlaps both the smallest core having the smallest diameter and the largest core having the largest diameter among a plurality of cores having different sizes when viewed from the axial direction. The transport cart according to any one of claims 2 to 5.

7. The transport cart according to claim 6, wherein a contact width of the stopper member with the smallest core is substantially the same as a contact width with the largest core when viewed from the axial direction. The transport cart according to claim 6.

8. The transport cart according to claim 6, wherein a contact width of the stopper member with the smallest core is larger than a contact width with the largest core when viewed from the axial direction. The transport cart according to claim 6.

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