Abstract: The present invention relates to a maize sheller having at least one drum and counter drum (concave). The counter drum has an adjustable part and a non-adjustable part. The maize sheller according to the invention possesses a regulating mechanism for regulating clearance between the drum and the adjustable part of the counter drum. The use of a counter drum of such a construction economizes a significant amount of metal and enhances the screening capacity and the productivity of the entire device. The regulation of the outlet aperture within a comparatively wide range permits the use of the maize sheller for shelling corn cobs of different sizes and with different moisture content without causing damage to the grain. In case of penetration of foreign matter into the shelling apparatus, the drum and the counter drum are protected against deformation by a safety sector which is automatically opened.

Abstract: Corn shelling apparatus having a supporting frame and a receiving hopper mounted on its upper part, beneath the hopper there being at least one shelling unit made up of an inner drum and an outer counter-drum, the drum being fitted inside the counter-drum, and having a fan and chute for removing the impurities, the stripped corn cobs, and the kernels. The drum is cylindrical, the counter-drum is frusto-conical and has its larger diameter turned upwardly toward the receiving hopper; the axes of the drum and counter-drum are vertical, and the peripheral surfaces of the drum and counter-drum are made of rods. The rods of the drum are disposed parallel and skewed with respect to vertical axial sections of the drum, and the rods of the counter-drum are disposed along the generant of a cone. The apparatus has an inclined kernel-collecting plane member enveloping the counter-drum upon the supporting frame of the apparatus.