| 主权项 |
1. An article transport facility comprising:
an article transport vehicle configured to travel along travel paths to transport an article; a travel rail pair on which the article transport vehicle travels, the travel rail pair including two rail members arranged in parallel and spaced apart from each other at a constant distance along a width direction which is perpendicular to a direction along which a corresponding travel path extends; first guide members whose positions are fixed with respect to the travel rail pair; second guide members whose positions are fixed with respect to the travel rail pair; wherein the article transport vehicle includes a first travel wheel pair including a pair of right and left travel wheels which roll on travel surfaces of the travel rail pair, a second travel wheel pair located on one side with respect to the first travel wheel pair along a vehicle body fore and aft direction which is along a travel direction of the article transport vehicle, the second travel wheel pair including a pair of right and left travel wheels which roll on the travel surfaces of the travel rail pair, guided members whose vertical positions can be fixed with respect to the first travel wheel pair and the second travel wheel pair, wherein the travel paths include a first path, a second path that crosses the first path, and a crossing portion in which the first path and the second path cross each other, wherein a first travel rail pair which is the travel rail pair provided along the first path has, in the crossing portion, a first discontinuous section in which the rail members are discontinuous, wherein a second travel rail pair which is the travel rail pair provided along the second path has, in the crossing portion, a second discontinuous section in which the rail members are discontinuous, wherein the first guide members allow movement of the guided members in the travel direction and restrict vertical movement of one or more of the guided members, in a first traveling state in which the first travel wheel pair is in the first discontinuous section and in a second traveling state in which the second travel wheel pair is in the first discontinuous section, when the article transport vehicle travels through the crossing portion along the first path, and wherein the second guide members allow movement of the guided members in the travel direction and restrict vertical movement of one or more of the guided members, in a third traveling state in which the first travel wheel pair is in the second discontinuous section and in a fourth traveling state in which the second travel wheel pair is in the second discontinuous section, when the article transport vehicle travels through the crossing portion along the second path. |
