Patent ID: 7954736

Claim:
An apparatus for reducing debris material of varying size comprising a frame including a debris material in-feed chute, a rotor for reducing the debris material to chips, a pair of feed rollers, including a first feed roller, and a second feed roller on the frame mounted for movement away from a first reference position relative to the first feed roller, a bias force member urging the second feed roller toward its reference position, an actuator assembly operably connected to said second feed roller for exerting a force to move the second feed roller in a direction away from the first feed roller, a sensor positioned to provide a signal which is a function of the height of debris material on the in-feed chute adjacent the feed rollers, and a controller to receive the signal from the sensor and to actuate the actuator and move the second feed roller away from its reference position to increase spacing between the first and second feed rollers for feeding the debris material in response to and as a function of the signal from the sensor.