| 摘要 |
For use primarily in a conveyor system wherein articles are required to be propelled along a predetermined path by driven belt means, the invention provides a pulley assembly having a rim member movable into and out of contact with the belt means responsive to a cam which is actuated by the propelled articles. The pulley assembly may itself directly drive the belt means or it may contact and thus drive the propelled articles or it may contact rollers in said predetermined path and upon which said articles rest. |
