Abstract: A horizontally oriented tubular screen has a shaft extending through it. Outwardly adjacent one end of the screen the shaft is configurated as a feed screw which receives cereal grain and feeds it into and through the screen. Within the confines of the screen the shaft is provided with one or more rows of pins projecting radially from the shaft. The pins of each row are located in a common plane, and the two planes include with one another an angle no greater than 90.degree. in circumferential direction of the shaft. The outlet end of the screen communicates with an outlet section through which the cereal grains are discharged.