Sharpening apparatus for forage harvester knives

摘要

A sharpening apparatus is disclosed for a plurality of knives disposed in a cutterhead generating a cylindrical periphery when rotating. The apparatus comprises a grinding stone; a carriage for carrying the grinding stone in a grinding mode across the cutterhead in a line generally parallel to the axis of rotation of the cutterhead; a drive coupled to said carriage for effecting reciprocatory movement of the carriage; and means for applying constant pressure on the knives by the grinding stone during grinding operations such that the cutterhead retains its cylindrical periphery after repeated sharpening operations.