| 摘要 |
In a powered conveyor comprising a frame, a plurality of article-supporting rollers mounted in the frame and a drive belt assembly for supplying driving power to the articles on the rollers, the invention provides that some at least of the belt guide pulleys act as control pulleys and for this purpose carry large diameter rings which are capable of being interposed between the belt and the pulley hub in order radially to displace the belt into driving engagement with an associated article-supporting roller. |
