Device for setting the position of a shear bar in respect of a shredder

摘要

The device has adjusting drives configured to move two ends of the shearbar with respect to the knives of the chopper assembly. A spacing measurement arrangement is configured to provide information regarding a position of the shearbar with respect to the knives. A controller is connected to the adjusting drives, and the spacing measurement arrangement to control the drives. The control arrangement is configured to cause the adjusting drives to position the end of the shearbar at a predetermined spacing from the knives, such that the spacing measurement arrangement indicates that the second end of the shearbar is equal to or less than a threshold distance from the knives while the first end of the shearbar is at the predetermined first spacing from the knives. The controller is configured to cause the second adjusting drive to position the second end of the shearbar at a predetermined second spacing from the knives. The controller is configured to cause the first adjusting drive to position the first end of the shearbar with respect to the knives such that the spacing measurement arrangement indicates that the first end of the shearbar is equal to or less than a second threshold distance from the knives while the second end of the shearbar is at the predetermined second spacing from the knives. The controller is configured to cause the adjusting drives to position the second ends of the shearbar with respect to the knives such that the ends are respectively located desired distances from the knives. The desired distances based on the information regarding the position of the shearbar with respect to the knives when the ends of the shearbar are at the threshold distances. The predetermined spacing from the knives being respectively greater than the desired distances from the knives. The knives of the chopper assembly define a convex enveloping circle having outer edges, the spacings being sufficiently large such that each end of the shearbar is configured to respectively engage the outer edges of the enveloping circle when the other of end of the shearbar is respectively positioned at a predetermined spacing from the knives. An independent claim is included for a method of adjusting a shearbar relative to knives of a chopper assembly in a harvester.