| 摘要 |
A transport system (2) comprises a local track (20) that is disposed so as to be below an overhead travelling vehicle track (10) , above a loading port (6) and in parallel with an overhead travelling vehicle track(10) . A local vehicle (22) travels along the local track (20) and includes a hoist (14) that lifts and lowers an article(18) . A two-level stepped buffer (25a,26a,25b,26b) includes an upper level and a lower level, wherein one article (18) is able to be placed on each of the upper level and the lower level. The lower level is disposed on a side close to the loading port (6) , the upper level is disposed on a side distant from the loading port, and regardless of whether an article has been placed on the lower level, the local vehicle (22) is able to pass above the lower level when the local vehicle is supporting an article (18) and when the local vehicle is not supporting an article. The upper level is disposed at a height according to which the local vehicle supporting an article may travel only above the upper level without an article, and the local vehicle not supporting an article may travel above the upper level both with an article and without an article. |
