Hold-down device for articles on a conveyor

Abstract

An apparatus for holding honeycomb core parts down on a conveyor while dust is being cleaned from the cells of the honeycomb by an upper air knife blowing a narrow jet of air down through the honeycomb cells as the part is being carried on a conveyor belt through an exhaust hood, and a pair of upwardly aimed air knives below the conveyor belt blowing two narrow jets of air on both sides of the first air knife through the honeycomb cells. The part is held down on the conveyor belt against the lifting force of the two air jets from the two lower air knives by a floating hold-down mechanism, which is adjustably counterbalanced to control the amount of hold-down force it exerts on the honeycomb part. The upper air knife is mounted on a counterbalance system that enables it to ride above and blow down through the hold-down mechanism without exerting significant force on the honeycomb part. The dust removed from the part is entrained in an air stream drawn through the exhaust hood and is removed from the air stream in a cyclone separator.