Patent ID: 7329854
Filing Date: 2008-02-12
Classification: F16P,G01V

Abstract:
1. A light screen safety system comprising: a plurality of light screens including a master light screen and at least one other light screen, the at least one other light screen operably connected and arranged sequentially upstream from the master light screen, each light screen including at least one processor, an emitter with a plurality of light transmitters, and a receiver with a plurality of light detectors, each light transmitter paired with one light detector; a control unit operably connected to and downstream from the master light screen; the processor of each light screen configured to determine if a light signal transmitted by any of the light transmitters is blocked from being received by the paired detector; the processor of the at least one other light screen configured to send a stop signal to the master light screen when a blocked condition is detected; and the processor of the master light screen transmitting the stop signal to the control unit when the master light screen receives the stop signal from an adjacent upstream light screen.