Forage harvester with a magnetic assebmly

A forage harvester comprising:

• a cutting mechanism configured to comminute a harvested material stream, the cutting mechanism including a cutter drum with a plurality of cutting blades and at least one shear bar configured to interact with the plurality of cutting blades in order to comminute the harvested material stream, wherein the cutting mechanism is supplied the harvested material stream by a prepressing unit, wherein a location at which the plurality of cutting blades interact with the at least one shear bar to comminute the harvested material stream comprises a material inflow area;
• and
• an edge sharpness detection device configured to detect at least one aspect of edge sharpness of the cutting mechanism and comprising at least one magnetic circuit and a magnetic assembly;
• wherein the edge sharpness detection device is configured to excite the at least one magnetic circuit using the magnetic assembly, wherein the at least one magnetic circuit is closed by a respective cutting blade during a rotation of the cutter drum once the respective cutting blade passes the magnetic assembly;
• wherein at least part of a magnetic flux of the at least one magnetic circuit closed by the respective cutting blade is guided lengthwise at least along a longitudinal section of the respective cutting blade;
• wherein the edge sharpness detection device is configured to detect the magnetic flux in the at least one magnetic circuit and, based on a detected change of a magnetic measurement relating to the magnetic flux, determine the at least one aspect of edge sharpness of the respective cutting blade;
• and
• wherein the magnetic assembly is positioned at least partly outside of the material inflow area of the cutting mechanism.