Patent ID: 7121411

Claim:
A screen apparatus comprising: a tank for receiving paper raw materials and including an entrance for the paper raw materials, a selection exit and a foreign matter exit, a cylindrical screen fixed in the tank and dividing the tank into a primary chamber and a secondary chamber, and a stirring member which is rotatably supported inside the screen for stirring the paper raw materials, wherein entrance for the paper raw materials and the foreign matter exit face the primary chamber, and the selection exit faces the secondary chamber, respectively, the screen has a member including an opening facing the primary chamber and the secondary chamber, a water supply passage member passes through the tank and includes a water supply passage which is in communication with the opening facing the secondary chamber and which supplies water into the primary chamber, the water supply passage member is mounted to an outer periphery of the tank such that the water supply passage member can move toward and away from the screen wherein the member is a ring provided around the screen, the ring is provided with a plurality of openings, and each of the openings facing the secondary chamber is provided with the water supply passage member.