Article sorting facility

1. An article sorting facility configured to cause a plurality of transport vehicles to transport articles, thereby sorting the articles, the article sorting facility comprising:

a first floor comprising a plurality of first travel paths along which the transport vehicles travel;

a second floor installed at a different height from the first floor in a vertical direction, and comprising a plurality of second travel paths along which the transport vehicles travel;

a plurality of first elevation mechanisms connecting terminating ends of the first travel paths to starting ends of the second travel paths, and configured to raise and lower the transport vehicles;

a plurality of second elevation mechanisms connecting terminating ends of the second travel paths to starting ends of the first travel paths, and configured to raise and lower the transport vehicles;

a plurality of receiving sections arranged on the first floor and not on the second floor, the plurality of receiving sections being aligned along each of the plurality of first travel paths, and configured to receive the articles from the transport vehicles; and

at least one supply section configured to supply the articles to the transport vehicles in at least one of the second travel paths or in a segment of at least one of the first travel paths, the segment located on a starting end side of a receiving section group comprising the plurality of receiving sections disposed along the at least one first travel path,

wherein the plurality of second travel paths overlap corresponding first travel paths or corresponding receiving sections as viewed in the vertical direction, at least in a partial segment,

wherein each of the plurality of transport vehicles travels on one of the plurality of first travel paths, conveys the article supplied from the supply section to one of the plurality of receiving sections, and then moves to one of the first elevation mechanisms,

wherein the transport vehicle moves via the first elevation mechanism to the second floor, travels on one of the plurality of second travel paths, and moves to one of the second elevation mechanisms, and

wherein the transport vehicle moves via the second elevation mechanism to the first floor and travels on one of the first travel paths.

2. The article sorting facility according to claim 1 ,

wherein the plurality of first elevation mechanisms comprise M first elevation mechanisms (where M is a natural number) in correspondence with the terminating end of each of the first travel paths, and

wherein the plurality of second elevation mechanisms comprise N second elevation mechanisms (where N is a natural number) in correspondence with the starting end of each of the first travel paths.

3. The article sorting facility according to claim 1 ,

wherein the second floor comprises a sum of the second travel paths that is greater than or equal to a sum of the first travel paths.

4. The article sorting facility according to claim 1 ,

wherein each of the first travel paths comprises a sorting segment in which the receiving section group is disposed, and

wherein the sorting segments of the plurality of first travel paths extend parallel to each other.

5. The article sorting facility according to claim 4 ,

wherein the sorting segments of the plurality of first travel paths extend in a first direction,

wherein the sorting segments are aligned in a second direction orthogonal to the first direction as viewed in the vertical direction, and

wherein the at least one supply section comprises a plurality of supply sections aligned in the second direction.

6. The article sorting facility according to claim 5 ,

wherein each of the plurality of first travel paths includes a first merging segment extending in the second direction in addition to the sorting segments, and

wherein the first merging segment includes a plurality of lanes, is formed by a plurality of sorting segments being connected to each other at ends thereof on one side in the first direction, is shared with the plurality of first travel paths, and includes the starting end of each of the first travel paths.

7. The article sorting facility according to claim 6 ,

wherein each of the plurality of second travel paths includes a straight segment and a second merging segment,

wherein the plurality of straight segments extend in the second direction and are disposed corresponding to the plurality of sorting segments, and

wherein each of the second merging segments includes a plurality of lanes, formed as a result of a plurality of straight segments being merged at end portions thereof on the one side in the first direction, is shared with the plurality of second travel paths, and includes the starting end of each of the second travel paths.

8. The article sorting facility according to claim 1 , further comprising:

a control device configured to control the plurality of transport vehicles,

wherein the at least one supply section comprises a plurality of supply sections,

wherein each of the plurality of supply sections comprises:

a buffer area in which to arrange the plurality of transport vehicles; and

a work area in which to accommodate either a supply device configured to perform a supply operation of supplying the articles to the transport vehicles located in the buffer area, or a worker who performs the supply operation, and

wherein the control device is configured to control travel of the plurality of transport vehicles such that sums of the transport vehicles aligned in the buffer area of each the plurality of supply sections become closer to equal to each other.

9. The article sorting facility according to claim 1 , further comprising:

at least one third elevation mechanism connecting an intermediate position of at least one of the first travel paths to an intermediate position of at least one of the second travel paths, and configured to raise and lower the transport vehicles,

wherein each of the plurality of transport vehicles is further configured to move from the first floor to the second floor via the third elevation mechanism.

10. The article sorting facility according to claim 1 ,

wherein each of the transport vehicles comprises a power storage device, and is configured to travel using power from the power storage device, and

wherein the second floor comprises a charging section configured to charge the power storage devices of the transport vehicles.

11. The article sorting facility of claim 1 , further comprising:

a plurality of transport devices adjacent to the corresponding receiving section groups,

wherein each of receiving sections is configured to transfer the article, received from the transport vehicle, to the adjacent transport device, and

wherein the transport device is configured to transport the article, received from the receiving section, from the adjacent receiving section group.