Patent ID: 7056188

Claim:
An automatic rock saw comprising: a frame; a blade operatively attached to the frame; a blade motor mounted on the frame and operatively attached to the blade to power the blade; a first conveyor having rollers and a conveyor belt to convey material to be cut to the blade, said first conveyor mounted on the frame such that the conveyor belt is substantially perpendicular to the blade; a second conveyor having rollers and a conveyor belt to convey material to be cut to the blade, said second conveyor mounted on the frame substantially parallel to and distance D 1 away from the blade and above the first conveyor; a conveyor motor mounted on the frame and operatively attached to the first and second conveyor to power the conveyors such that both conveyor run at the substantially the same speed; a sensor attached to the blade motor to detect load on the blade motor; and a controller to control the speed of the conveyor motor based on an inverse relation to the load on the blade motor.