The ROTARY SCREENER removes the dreg by raising the several rake combined on number of infinite-chain located in the center from the bottom of the screen. The frontal part of the bottom of the main screen is raised to the back through the potential screen installed separately. The supper screen relevant to the upper part of the waterway is a machinery facility dropping the dreg collected by the inclined direction board built with stainless steel sheet onto the conveyor. [Patent No.10-0928411]