Patent ID: 8056309
Filing Date: 2011-11-15
Classification: A01F

Abstract:
1. A system for controlling the position of one or more feed rolls in a forage harvester, the harvester comprising at least one fixed feed roll arranged to rotate around a rotational axis which is stationary with respect to a chassis of the harvester, and at least one movable feed roll arranged to rotate around a rotational axis which cooperates with the at least one fixed feed roll, and is movable towards or away from the corresponding fixed feed roll to move a crop therethrough, the system comprising: at least one piston/cylinder arrangement arranged to control movement of the movable feed roll towards or away from the corresponding fixed roll; a hydraulic pressure source and at least one hydraulic connecting line positioned between and connected to the hydraulic pressure source and the piston/cylinder arrangement; input data from a plurality of sensors including rotational speed of a drive shaft of the movable feed roll, position of the movable feed roll, and driving force, wherein the driving force is determined by at least one of a control unit configured for receiving the input data of the rotational speed of the drive shaft, the driving force, and the position of the movable feed roll, the control unit further configured to calculate a command signal as a result of the receipt of at least one of an apparatus to actuate movement of the movable feed roll in response to at least one command signal, the apparatus including