Forage harvester with a magnetic assebmly

US11109537B2 · kind B2 · utility

Assignee

• CLAAS Selbstfahrende Erntemaschinen GmbH · DE

Inventors

• Dennis Neitemeier · Lippetal, DE
• Christoph Heitmann · Warendorf, DE
• Jochen Huster · Vellmar, DE
• Markus Brune · Harsewinkel, DE
• Boris Kettelhoit · Vellmar, DE

Key dates

• Filing date: Dec 12, 2018
• Grant date: Sep 7, 2021
• Expiry date: Dec 18, 2039

Classification

• Technology area (CPC G): Physics
• CPC primary: G01B7/293
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A forage harvester comprising an edge sharpness detection device for detecting a degree of edge sharpness of a cutting mechanism. The cutting mechanism comminutes a stream of harvested material, with a material inflow area being defined where the cutting blades interact with the shear bar to comminute the harvested material. The edge sharpness detection device excites one or more magnetic circuits, with the respective magnetic circuit being closed by the respective cutting blade during rotation of the cutter drum once one of the cutting blades passes the magnetic assembly. The edge sharpness detection device detects the magnetic flux in the respective magnetic circuit and, based on a detected change, determines a degree of edge sharpness of the respective cutting blade. Further, the magnetic flux of the magnetic circuit may be guided lengthwise in the cutting blade at least along a longitudinal section of the respective cutting blade.