Article transport facility

1. An article transport facility comprising:

an article transport device for transporting articles among a plurality of transfer target locations arranged in a vertical direction,

wherein the article transport device includes a vertically movable member which is movable along the vertical direction, and a transfer device which is supported by the vertically movable member and is configured to transfer an article to or from any one of the transfer target locations,

wherein the transfer device includes a support body for receiving and supporting an article, and a projecting and retracting actuator for projecting and retracting the support body between a projected position in which the support body is projected toward the any one of the transfer target location and a retracted position in which the support body is retracted toward the vertically movable member,

wherein the support body includes a support member which is elastically deformable in the vertical direction to change shape or dimension elastically and vertically under stress, wherein the support body is configured to receive and elastically support an article with the support member from below the article, and

wherein a cushion member which is elastically deformable in the vertical direction is provided to the vertically movable member such that the cushion member is spaced apart upwardly by a set distance from an article which is received and supported by the support member.

2. The article transport facility as defined in claim 1 , wherein:

the support body includes a base member which is projected and retracted by the projecting and retracting actuator,

wherein the support member is provided to the support body so as to project upwardly from the base member, and

wherein the support member includes an engaging portion for engaging, from below, a recessed portion formed in an undersurface of an article and having a shape that is recessed upwardly, and an elastic portion interposed between the engaging portion and the base member such that the elastic portion can expand and contract in the vertical direction to urge the engaging portion upwardly.

3. The article transport facility as defined in claim 2 , wherein

the set distance is set to be less than an insert length which is a vertical length of a portion, of the engaging portion engaging the recessed portion, that is inserted into the recessed portion when the article is received and supported by the support member.

4. The article transport facility as defined in claim 3 , wherein

the set distance is set to a length such that an upper end of the article received and supported by the support member and a lower end of the cushion member are spaced apart from each other under a condition in which the article is lightest, and is set to be less than the insert length under a condition in which the article is heaviest.

5. The article transport facility as defined in claim 2 , wherein

an undersurface of the cushion member is formed to have a shape that conforms to a top surface of the article.

6. The article transport facility as defined in claim 5 , wherein

an uppermost surface of the article is formed to be a flat surface, and

wherein the cushion member is formed to be plate-shaped, and is provided to the vertically movable member in an attitude such as to extend along the uppermost surface of the article received and supported by the said support body.

7. The article transport facility as defined in claim 3 , wherein

an undersurface of the cushion member is formed to have a shape that conforms to a top surface of the article.

8. The article transport facility as defined in claim 7 , wherein

an uppermost surface of the article is formed to be a flat surface, and

wherein the cushion member is formed to be plate-shaped, and is provided to the vertically movable member in an attitude such as to extend along the uppermost surface of the article received and supported by the said support body.

9. The article transport facility as defined in claim 4 , wherein

an undersurface of the cushion member is formed to have a shape that conforms to a top surface of the article.

10. The article transport facility as defined in claim 9 , wherein

an uppermost surface of the article is formed to be a flat surface, and

wherein the cushion member is formed to be plate-shaped, and is provided to the vertically movable member in an attitude such as to extend along the uppermost surface of the article received and supported by the said support body.

11. The article transport facility as defined in claim 1 , wherein

an undersurface of the cushion member is formed to have a shape that conforms to a top surface of the article.

12. The article transport facility as defined in claim 11 , wherein

an uppermost surface of the article is formed to be a flat surface, and

wherein the cushion member is formed to be plate-shaped, and is provided to the vertically movable member in an attitude such as to extend along the uppermost surface of the article received and supported by the said support body.

13. The article transport facility as defined in claim 1 , wherein

the support member by which the article is received and supported expands or is shifted upwardly as the article is lifted in the vertical direction.

14. The article transport facility as defined in claim 13 , wherein

resilience of the support member is set to be a force such that, when the article is received and supported by the support member, the support member is in an intermediate state between a state in which the support member extends to the greatest degree under a condition in which the article is lightest, and a state in which the support member contracts to the greatest degree under a condition in which the article is heaviest.

15. The article transport facility as defined in claim 14 , wherein

the support body includes a base member which is projected and retracted by the projecting and retracting actuator,

wherein the support member is provided to the support body so as to project upwardly from the base member, and

wherein the support member includes an engaging portion for engaging, from below, a recessed portion formed in an undersurface of an article and having a shape that is recessed upwardly, and an elastic portion interposed between the engaging portion and the base member such that the elastic portion can expand and contract in the vertical direction to urge the engaging portion upwardly.

16. The article transport facility as defined in claim 15 , wherein

the set distance is set to be less than an insert length which is a vertical length of a portion, of the engaging portion engaging the recessed portion, that is inserted into the recessed portion when the article is received and supported by the support member.

17. The article transport facility as defined in claim 16 , wherein

the set distance is set to a length such that an upper end of the article received and supported by the support member and a lower end of the cushion member are spaced apart from each other under a condition in which the article is lightest, and is set to be less than the insert length under a condition in which the article is heaviest.

18. The article transport facility as defined in claim 17 , wherein

an undersurface of the cushion member is formed to have a shape that conforms to a top surface of the article.

19. The article transport facility as defined in claim 18 , wherein

an uppermost surface of the article is formed to be a flat surface, and

wherein the cushion member is formed to be plate-shaped, and is provided to the vertically movable member in an attitude such as to extend along the uppermost surface of the article received and supported by the said support body.