Verfahren und Vorrichtung zur Schneidschärfeerkennung der Häckselmesser eines Feldhäckslers mit umlaufend angetriebenen Häckselmessern wobei den Häckselmessern (2) ein Referenzwerkstoff (18) zum Zerschneiden zugeführt wird, der eine vergleichende Aussage über den momentanen Zustand der Schärfe der Häckselmesser (2) ermöglicht.The method involves feeding a reference material (18) i.e. biodegradable material, for cutting by a rotationally driven cutter blade (2), and providing comparative statement about current state of sharpness of the cutter blade at specified speed during idle operation. The biodegradable material is made of a flexible thread-like material (19) and a rigid plate-or rod-like material, where the reference material comprises gas or liquid jet. Pulsation of the gas or liquid jet is evaluated based on spectral analysis using frequency spectrum by a sensor (26). An independent claim is also included for a device for detecting cutting sharpness of a cutter blade on a forage harvester.
