| 摘要 |
<p>A conveyor assembly has a conveyor belt (10) following an endless path part of which is formed by a helical conveying path consisting of a plurality of tiers arranged one on top of another in a stack (12). The edges of the belt (10) have upstanding projections which act to space adjacent tiers of the stack. The belt is driven along its endless path by a rotatably driven hub (28) which drives the belt (10) at a location (22) where the belt (10) approaches the top of the stack. This single drive, at a location external to the stack, avoid any build-up of tension in the belt and avoids the need for any form of device for taking up belt tension.</p> |
