ROTARY FEEDER

Japanese Patent JP3798449

B2

PROBLEM TO BE SOLVED: To prevent powder/grain from going over the peripheral surface of a rotor to enter the bearing side. SOLUTION: A ring groove 33x is formed on the peripheral surface of a side plate 33 of a rotor 3 constituting a rotary feeder 1, and an air hole 21b is formed in a body part 21 opposed to the ring groove 33x. With the rotation of the rotor 3, large rotating speed is added to compressed air fed to the ring groove 33x through the air hole 21b. As a result, the compressed air is vigorously jetted toward the storage recessed part 3a side of the side plate 33 through a micro clearance between the peripheral surface of the side plate 33 and the inner peripheral surface of the body part 21 not only with the pressure possessed by the compressed air but also with the flow speed added by the rotation of the rotor 3. Powder/grain is therefore prevented from entering the bearing 41 side through the above-mentioned clearance.