METHOD AND SYSTEM FOR SIMULTANEOUS BI-DIRECTIONAL CONVEYOR CONTROL FOR MOVING MATERIAL HOLDERS IN A FAB
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United States of America Patent
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Issued Date -
Apr 22, 2010
app pub date -
Apr 8, 2009
filing date -
Apr 8, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method for managing flow of containers over asynchronous conveyors used in semiconductor automated material handling systems (AMHS) is defined. The method includes providing a conveyor and enabling travel of a first container in a first direction on the conveyor and enabling travel of a second container in a second direction on the conveyor. The second direction being toward the first direction. The method also includes determining a destination of the first and second containers along the conveyor (e.g., such as a load port). The method then directions one of the first or second containers to reverse its direction to enable one of the first or second containers to arrive to its destinations. The directing acts to minimize travel or wait time of the first or second containers on the conveyor belt. The directing enables higher throughput on the conveyor and enables more than one container to travel on the conveyor at the same time.
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