Spring roll mill

Spring roll mill having stationary grinding rolls yieldingly pressed from within the mill toward a circumferential grinding ring mounted on a grinding dish and revolving together therewith, a central feed inlet for supplying to the mill from above material to be ground therein, and a discharge outlet for discharging the ground material from the mill together with an air flow, comprising a distributor plate revolving together with the grinding dish, said distributor plate being disposed below the central feed inlet and below at least part of the grinding rolls for receiving thereon a supply of the material to be ground, means for centrally introducing the air flow from below said distributor plate and conducting the air flow between the grinding rolls and the grinding dish and between the grinding rolls themselves, a sifter having a centrifugal system disposed above the grinding dish, and separate means for driving the centrifugal system.