Abstract: A device for cleaning textile fiber flocks, comprising a conveyor band of a material that is penetrable by air, means for continuously feeding textile fiber flocks onto the upper run of the conveyor band and means for sucking air from below through the upper run when covered by a layer of the flocks, and a rotatable roller having elastically flexible leaves that protrude freely in radial directions and are substantially parallel to the axis of the roller, in proximity of the delivery end of the conveyor band and running in the same direction in which the upper band run moves, at such a high speed that the circumferential speed of the ends of the leaves is somewhat greater than that of the band, the roller being arranged in such a manner that the ends of the leaves strike, during their rotation, a point of the conveyor band that is not supported. A gap or interstice is provided between the roller and the conveyor band. The invention also provides optional, additional features for the cleaning device.