| 摘要 |
A shuttle exchanger 22 exchanges a shuttle 19 circulating in a reentrant lumen 13 by actuating a channel selector 27 to alter the path of the shuttle to be exchanged. Following the altered path the to-be-exchanged shuttle impinges on a shuttle 42 stored in a storage channel 25 and drives it into the reentrant loop while the to-be-exchanged shuttle is retained in the storage channel. The enclosing wall 23 of the shuttle exchanger defines part of the reentrant lumen and includes therein the channel selector 27, the shuttle storage channel 25, a bypass channel 26, and a collector section 29. |
