Patent ID: 8573406

Claim:
A device for sieving foreign bodies out of a material stream, comprising: a roller sieve comprising a plurality of rollers disposed in parallel to one another; and discs disposed on the plurality of rollers such that they are perpendicular to the axial extension of the rollers, wherein the discs of adjacent rollers are engaged so as form slot areas between the discs and the adjacent rollers through which a first portion of the material stream can flow, wherein the discs disposed on each roller comprise impulse discs having a peripheral contour comprised of at least one corner, the peripheral contour of the impulse discs configured to disaggregate a material stream disposed on the roller sieve, and conveyor discs having a peripheral contour comprised of a series of indentations, the conveyor discs configured to promote friction to convey a second portion of the material stream in a transport direction, and wherein the conveyor discs disposed on each roller have varying diameters.