Abstract: A combine harvester has a straw chopper attached to a rear hood behind the rear edge of the sieve assembly with a chaff guide system to bypass the chaff in front of the chopper and a straw guide system to bypass the straw above the chopper and over the tailboard. The chopper has a housing with a feed opening into which straw and/or chaff can be fed depending upon the positions of the chaff guide system and the straw guide system. A chopping assembly mounted in the housing discharges through a discharge opening through onto the tailboard having a plurality of guide fins for spreading. The housing bottom wall has a pivotal adjustment portion to allow chaff entering the feed opening and engaging the chopping assembly to discharge from the housing at a discharge position different from the discharge opening for spreading with supplementary spreading fins.

Abstract: A combine harvester with a straw separating system and a sieve assembly below the straw separation system with a rear edge over which the chaff is discharged in the air flow has a housing with a rear hood behind the straw separating system and behind the rear edge of the sieve assembly with a bottom opening in the hood for discharge of the straw and the lighter materials. A straw chopper is mounted at the rear hood for receiving the straw and lighter materials and has a rotor for chopping the straw and for generating a stream of air and chopped straw for spreading the chopped straw.

Abstract: A straw and chaff chopper is mounted at the rear hood of a combine harvester and includes a housing with a feed opening and a discharge opening and a rotor mounted in the housing comprising a hub with a plurality of blades mounted on the hub for chopping the fed materials and accelerating the chopped materials for discharge. A tailboard has a plurality of guide fins arranged relative to the housing so as to receive the chopped materials from the discharge opening to engage onto a guide surface and guide fins of the tailboard construction for spreading of the chopped materials. The tailboard is divided longitudinally into first and second separate tailboard portions, each arranged to receive a portion of the chopped materials and each being adjustable in angle to raise and lower independently of the other so as to provide a different spreading effect on the portion received thereon. Fins on the portions prevent the materials entering the gap. Adjustment on the go from the cab can be provided.