In these automatic feed plants, material is to be lifted more than 8-10 ft. from floor level, hence bucket elevators are employed in place of screw conveyors. It consists of two pulleys - one  driven pulley at bottom and second on top which is a driving pulley. Cotton or rubber belt run over these pulleys and buckets at proper intervals are bolted on this belt. All these are enclosed in housing having an inlet at bottom and an outlet at top. When pulleys revolve, buckets are filled with material at bottom and are emptied at top by centrifugal force.