| 摘要 |
A gravity conveyor(20) includes one or more zones(1,2,3,4) with each zone having at least one brake(30) associated therewith. A controller turns the brakes(30) on for each zone according to various programmable conditions. Th e downstream-most zone may have its brakes turned on whenever a package(26) is present at the end(24) of the conveyor. Any of the zones(1,2,3,4) may have their brakes turned on in a pulsed manner. The zones may also have their brakes(30) turned on in other situations, such as simultaneous blockage of that zone with another zone, the initial sensing of the leading edge of an article, as well as in other situations.
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