Patent ID: 7900858
Filing Date: 2011-03-08
Classification: B02C

Abstract:
1. A material reducing apparatus comprising: a feed conveyor for conveying material to be reduced; a feed roller cooperating with the feed conveyor for assisting with conveying the material to be reduced; an upwardly rotatable rotor carrying a plurality of strikers which facilitate reduction of the material to be reduced; an anvil cooperating with the plurality of strikers to facilitate further reduction of the material to be reduced; and a grate assembly, located adjacent an arcuate path of the rotor, which permits sufficiently reduced material to pass through openings provided therein; wherein the material reducing apparatus further includes a control system which comprises an accelerometer supported by the rotor and coupled to the control system, and the accelerometer transmits vibration signals to the control system, and when the control system receives a vibration signal above a threshold, the control system reverses a rotational direction of the feed roller so that the feed roller rotates to withdraw hard material, that is not readily shearable by the strikers, from contact with the rotor, and actuates the grate assembly to form an ejection opening, in the grate assembly, for ejecting ungrindable material from the material reducing apparatus.