Abstract: A chopper drum includes a plurality of knives distributed along its width and about its circumference. A grinding device is provided for automatically sharpening the knives, with a grinding stone of the grinding device having its movement automatically controlled by a microprocessor, which receives signals from an actual shape sensor and compares it with a stored desired shape and generates control signals, such that it shapes the profile of the chopper drum to at least approximate the desired shape.

Abstract: A large round baler includes a plurality of bale-forming rolls which each have opposite ends defined by stub shafts rotatably supported in respective bearings fixed to opposite side walls of the bale chamber. The rolls are each in the form of a hollow cylindrical drum and each stub shaft includes a flange having a diameter corresponding to the inside diameter of the drum and being secured to the drum at a location spaced inwardly from an end face of the drum. For preventing crop particles and juices from reaching each bearing, a ring-like seal body is fixed to the outer surface of the flange in concentric relationship to the stub shaft and to, and between, a cylindrical sealing surface of a collar that is fixed to the wall and a ring that is also fixed to the wall. The seal body has a plurality of radially outward projecting lips disposed very close to the sealing surface of the collar and a single radially inward projecting lip disposed very close to the ring.

Abstract: A device is provided for tucking or inserting the free end portion a length of twine, just severed from a supply roll, under one or more wraps of the length of twine extending about the circumference of a bale located in a bale chamber of a large round baler.