Abstract: A grain decorticating machine is provided with a distributor rotor and an impact band. The impact band further includes impact surfaces shaped in the form of an annular succession of first plates oblique with respect to the radius of the rotor, and by an annular surface, coaxial with the rotor and situated behind the annular succession of first plates. The annular surface faces the outer radius of the rotor. An opening is defined between each pair of adjacent first plates. The openings thus formed provide tunnels for passage of the air blown from the rotor and also for the decorticated materials. The rotor has a roof and a floor which define an annular crown. The annular crown is subdivided internally by a plurality of radial partitions, with each adjacent pair of radial partitions defining a radial crown segment which faces outward toward the impact band.

Abstract: A machine for dehulling flat disc-like seeds having a relatively heavy kernel inside the hull comprising a spinning rotor for throwing the seeds against an annular impact band to crack the hull. The rotor consists of a disc with radial blades on the surface thereof which define channels for orienting the seeds so that they are ejected like spinning saucers and strike the impact ring at their fault lines. The radial blades may also include a sweeping fin to clear the path of seed portions which might interfere with the impacting of the seeds.