Article transport facility

1 . An article transport facility comprising:

a transport vehicle configured to transport articles;

a first travel floor and a second travel floor on which the transport vehicle is travelable;

a plurality of lifters configured to lift and lower the transport vehicle between the first travel floor and the second travel floor; and

a control device configured to control transport of the articles, and

wherein:

the plurality of lifters comprise a first lifter, a second lifter, a third lifter, a fourth lifter, a fifth lifter, and a sixth lifter that are horizontally spaced from each,

the article transport facility comprises, on the first travel floor, a first travel route connecting the first lifter and the second lifter, a second travel route connecting the third lifter and the fourth lifter, a third travel route connecting the fifth lifter and the sixth lifter, and a first connection route, the first travel route, the second travel route, and the third travel route being arranged in parallel, and the first connection route comprising a section connecting the first travel route and the second travel route, and a section connecting the second travel route and the third travel route,

the article transport facility comprises, on the second travel floor, a fourth travel route connecting the first lifter and the second lifter, a fifth travel route connecting the third lifter and the fourth lifter, a sixth travel route connecting the fifth lifter and the sixth lifter, and a second connection route, the fourth travel route, the fifth travel route, and the sixth travel route being arranged in parallel, and the second connection route comprising a section connecting the fourth travel route and the fifth travel route, and a section connecting the fifth travel route and the sixth travel route,

the article transport facility has, on the first travel floor, a first area that includes the first travel route but does not include the second travel route and the third travel route, a second area that includes the second travel route but does not include the first travel route and the third travel route, and a third area that includes the third travel route but does not include the first travel route and the second travel route,

the control device is configured to set each of the first area, the second area, and the third area to a travel prohibition area in which travel of the transport vehicle is prohibited,

in response to the first area being set to the travel prohibition area, the control device prohibits the transport vehicle from traveling in the first area but allows the transport vehicle to travel in the second area and the third area,

in response to the third area being set to the travel prohibition area, the control device prohibits the transport vehicle from traveling in the third area but allows the transport vehicle to travel in the first area and the second area,

in response to the second area being set to the travel prohibition area, the control device prohibits the transport vehicle from traveling in the second area but allows the transport vehicle to travel in the first area and the third area, and

while travel in the second area is prohibited, the transport vehicle moves between the first area and the third area via the second connection route on the second travel floor.

2 . The article transport facility according to claim 1 ,

wherein the control device is configured to detect entry of a worker into any one of the first area, the second area, and the third area, and set the area for which the entry of the worker has been detected to the travel prohibition area.

3 . The article transport facility according to claim 1 , wherein:

the first travel route is a route in which only one-way traffic from the second lifter to the first lifter is allowed,

the fourth travel route is a route in which only one-way traffic from the first lifter to the second lifter is allowed,

the second travel route is a route in which only one-way traffic from the fourth lifter to the third lifter is allowed,

the fifth travel route is a route in which only one-way traffic from the third lifter to the fourth lifter is allowed,

the third travel route is a route in which only one-way traffic from the sixth lifter to the fifth lifter is allowed,

the sixth travel route is a route in which only one-way traffic from the fifth lifter to the sixth lifter is allowed, and

while travel in the second area is prohibited, the transport vehicle moves from the first area to the third area by moving along the first travel route, the first lifter, the fourth travel route, the second connection route, the sixth travel route, and the sixth lifter in this order.

4 . The article transport facility according to claim 3 , further comprising:

article supply sections for supplying the articles to be transported by the transport vehicle, and

wherein the article supply sections are respectively adjacent to sections of the first travel route, the second travel route, and the third travel route located upstream of the first connection route.

5 . The article transport facility according to claim 1 , further comprising:

a first conveyor and a second conveyor in a space in an up-down direction between the first travel floor and the second travel floor, the first conveyor being provided between the first travel route and the second travel route while extending along the first travel route, and the second conveyor being provided between the second travel route and the third travel route while extending along the second travel route,

wherein the first area and the second area are separated from each other by the first conveyor, and

wherein the second area and the third area are separated from each other by the second conveyor.