Device for the processing of materials

A device for processing materials by comminuting, filtering, sifting, or grading, said materials including rock, ore, clay, bulk materials and agglomerated pulverized materials, said device comprising two tools, each of said tools having a central axis and having a working surface, means mounting each of said tools for rotation about the respective central axis thereof, said tools being oriented such that the working surfaces thereof are in opposed, horizontally spaced relation and cooperate to form a nip therebetween, means for moving at least one of said tools with an oscillating rotational motion about the respective central axis thereof, said tools cooperating to form a feeder wedge for receiving material to be processed between the working surfaces thereof, said feeder wedge merging into said nip, the working surfaces of said tools including upper and lower surface portions, comminuting projection means including at least one comminuting projection formed in the upper surface portion of said at least one tool, the lower surface portions of said tools each substantially defining a segment of a cylinder and each being coaxially oriented with respect to the central axis thereof, said lower surface portions of said tools being substantially smooth and being disposed in opposed closely spaced relation during movement of said tools, said nip being of substantially constant dimension during rotation of said tools.