Rotary cutting die

A rotary cutting die adapted to be adjustably mounted on a rotatable cylindrical die drum of a rotary press to cut a planar object passed between such rotating die drum and an oppositely-rotating cooperative anvil drum of said press, said die drum having at least one longitudinal row of uniformly-spaced radially-extending tapped holes, comprising:

• a die board having a concave surface adapted to cover a cylindrical surface portion of said die drum, an opposite convex surface, and a plurality of longitudinally spaced circumferentially-elongated openings extending radially therethrough, said die board being adapted to be selectively moved circumferentially relative to said die drum to an infinite number of positions and longitudinally relative to said die drum to any of a plurality of discrete positions at which some of said die board openings will register with some of said die drum holes;
• fastening means adapted to engage said die board and such of said die drum holes which are exposed through said die board openings at each of said discrete positions, and selectively operable to hold said die board to said die drum at any selected circumferential position and at any selected one of said discrete positions;
• knife means adapted to be selectively mounted on said die board at any of a plurality of large incremental positions relative thereto in a longitudinal direction and having a knife edge adapted to extend radially beyond said convex surface to cut said object, said knife means being adapted to be moved to a particular large incremental position when said die board is in a particular discrete position to enable said knife edge to be coarsely positioned relative to said die drum at any of a plurality of small incremental positions spaced evenly from one another, said knife means being also adapted to be further displaced relative to said die board from each of said large incremental positions to enable said knife edge to be finely positioned relative to said die drum at any position between said small incremental positions;
• and
• holding means mounted on said die board and selectively operable to hold said knife means at any selected position relative to said die board;
• whereby by such selective positioning of said die board and by such coarse and fine positioning of said knife means, said knife edge may be adjustably mounted on said die drum at any desired position in a circumferential direction, and at any desired position in a longitudinal direction.