| 摘要 |
A zoning conveyor (10) formed of a plurality of drive rollers (14) upon which are mounted sleeves (40) normally capable of rotating with the drive rollers by frictional contact therewith, but capable of being stopped while the drive rollers continue to rotate. Connecting structures (44, 46 or 78, 80) are provided for interconnecting selected sleeves (40) within a selected zone in such a manner that the selected sleeves within the zone all have the same rotational speed. Stop structures are provided which are capable of stopping at least one of the selected sleeves within a zone from rotating whereby all selected sleeves within the zone are caused to be stopped from rotation by the connecting structures. The stop structure may be a gate (48), a brake in the form of a disk (60) and a shiftable element (64) capable of engaging the disk to prevent its rotation. Alternatively, the brake may be a belt (82) loosely disposed over two adjacent sleeves and which is anchored to the conveyor frame, which belt may be tightened to prevent rotation of the adjacent sleeves. Article position sensors are also disclosed, these including a microswitch (74, 76) or an electric eye and reflector (96, 98).
|
