PROBLEM TO BE SOLVED: To make it possible to prevent the clogging of meshes by spreading a rear surface net in parallel with a front surface net apart a spacing under the front surface net of a sieving device and movably housing plural pieces of clogging dice of a dice type into the gap between the front surface net and the rear surface net. ;SOLUTION: A rotary sieving machine is constituted by segmenting the inside of a main body case 1 to sieving chambers 5, 6, 7, 8 spread with the nets 2, 3, 4 of the meshes made successively finer from above and delivers the tea sorted by these nets 2 to 4 to take-out ports 9 to 12. An eccentric turning body is fixed to the main body case 1. An eccentric shaft disposed in a machine frame is inserted to this turning body and the main body case 1 is eccentrically turned through the eccentric shaft, by which the leaf tea in the respective sieving chambers 5 to 8 in the main body case 1 is sieved. The rear surface net of the meshes coarser than the meshes of the front surface net 4 is spread in parallel under the front surface net 4 in the sieving chamber 8 spread with the front surface net 4 of the finest meshes to form the gap 19. The clogging preventive dice 20 of the dice type are housed into the gap so as to be made movable vertically and laterally within the gap 19.;COPYRIGHT: (C)1997,JPO
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