Operator portable device conveyor protection mechanism having operator held coded signal transmitters and conveyor placed radiation patterns security module controlled stopping conveyor when radiation detected.

摘要

The operator detection mechanism has a detection and control mechanism to stop the conveyor (10) when the operator (18) is in a given position. The operator has a portable unit (16) with radio transmitters passing coded radio signals to antennas. There are several radio receivers placed under a portal (12), with a selective radiating lobe (LR). A security module with test transmitter controls the receiver functions and stops the conveyor drive when an operator is detected near the radiating lobe.