[...] Using a piece of  conveyor belt,  long by  wide and a couple of pieces of angle iron, you can make a pinch-point feeler, a warning device for the corners of a continuous miner. This will give a warning nudge to anyone in the danger area, giving him or her about a  running start to stop the machine or to yell at the operator to stop.
A simple device can be constructed using a length of conveyor belt and some angle iron to serve as an early warning system for the corners of a continuous miner. This will give people working near the danger area a brief moment's notice, allowing them to react by stopping the machine or alerting the operator.