| 摘要 |
An air conveyor for a single stream of items (5) comprises an upstream end (1) and a downstream end (2). Monitoring means (8) are provided for monitoring the separation of items in a first designated section (7) of the stream and control means (9) are provided for controlling the flow of items over a second section of the stream upstream of the designated section. The control means (9) is responsive to item separation in the designated section (7) of the stream as monitored by the monitoring means (8) to maintain item separation in the designated section (7) at a desired level.
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