Abstract: A rotary drum air filter has a drive tire where a rubber tire runs against a drive rim attached to the drum co-axial therewith. A seal on the forward part of the drum rides upon a conic section on the scroll. Differential air pressure across the drum holds the seal against the conic section on the scroll. A unitary rigid manifold with a plurality of pipes is mounted for rotation about its longitudinal axis. Therefore, by rotation of the manifold, nozzles in the pipes can be exposed for adjustment and inspection. Nozzle tips in each the pipes extending from the manifold are adjustable so as to regulate the distance from the lip of the nozzle tip to the surface of the drum. For use with an atmosphere heavily laden with lint, a two-part nozzle is used so that the leading edge of the nozzle can be spaced away from the filter medium on the drum surface to accommodate a thick layer of lint which accumulated on the drum surface.

Abstract: Apparatus to remove dust, fibers, lint or other undesirable particles from air. Air ladened with dust, lint or other undesirable matter is drawn into a filtering housing to contact the surface of a rotatable screen-covered drum. The air passes through the drum while the particles remain on the drum surface. The air passes from a higher pressure area exterior of the drum into a lower pressure area within the center of the drum and is conveyed away. The particles are retained on the exterior surface of the drum which is covered by the fine mesh screen. The particles, which form a bat, are then separated from the rotating drum surface by being moved into contact with a smooth compressor roll cooperating with a flighted doffing to lift away the bat from the drum and drop it to a collection zone.A supplemental doffing roll with rigid flights is rotated parallel to the axes of the compression roll and flighted doffing roll in such manner as to interfere with the rotation of urethane flights of the doffing roll.