Arrangement for comminuting and/or shredding of paper and synthetic materials

In a comminuting arrangement, a housing supported for rotation about a first axis and having a centrally apertured plate disposed therein, the plate extending perpendicular to the first axis intermediate the axial ends of the housing, first and second shafts disposed in the housing parallel to said first axis and extending through the aperture in the plate, at least the first shaft being supported for rotattion about its axis, first means comprising spaced rough-cutting discs affixed to the first and second shafts within the housing on one side of the plate and intermeshing to form a nip therebetween for shredding material introduced into the nip from above when at least the first shaft is rotated, second means comprising spaced, fine-cutting discs affixed to the first and second shafts in axially spaced relation to the rough-cutting discs within the housing on the other side of the plate and intermeshing to form a nip therebetween for shredding material introduced into the nip through the aperture in the plate when at least the first shaft is rotated, means for introducing material to be shredded into the housing, means disposed on the interior of the periphery of the housing for effecting movement so that the material in the housing moves jointly with the housing when the housing is rotated until said material is disposed above the nip of at least the first shredding means, means for rotating the housing about the first axis, and means for rotating the first shaft about its axis.