Patent ID: 8113455

Claim:
A device for grinding input material, the device comprising: a first interchangeable ring; a second interchangeable ring; a supporting disk rotating around an axis of rotation inside a housing; first grinding tools being arranged concentrically on a circumference of the supporting disk; and second grinding tools being provided axially opposite to the first grinding tools to thereby form a radial grinding gap, wherein the second grinding tools are arranged on the second interchangeable ring which is fastened in a fixed position on a door of the housing; wherein the first grinding tools and the second grinding tools execute a relative movement with respect to one another, and wherein, for fastening the first grinding tools to the supporting disk, the first interchangeable ring is arranged and is removably fastened on the supporting disk concentrically to the axis of rotation and on which the first grinding tools are arranged, and wherein at least one of said first or second interchangeable rings is subdivided into an inner circumferential area and an outer circumferential area, wherein the inner circumferential area is provided for fastening the at least one of said first or second interchangeable rings to the supporting disk or the door of said housing, and the outer circumferential area is provided for fastening the grinding tools, and wherein the outer circumferential area of at least one of said first or second interchangeable rings has a concentric annular shoulder, which forms a radial stop for the grinding tools.