Patent ID: 8726775

Claim:
A punching scrap removal device for a rotary die cutter which comprises a knife cylinder, an anvil cylinder arranged in contraposition to the knife cylinder, and a blade mount installed on an outer periphery of the knife cylinder with a punching blade, the blade mount having an arc-shaped cross-section, the punching blade punching a sheet to be processed that is passed between the knife cylinder and the anvil cylinder, the device comprising: a plurality of first push members which are movably installed in a plurality of first through-holes respectively, the first through-holes being formed in an outer wall of the knife cylinder; a plurality of second push members which are movably installed in a plurality of second through-holes respectively, the second through-holes being formed in the blade mount at face-to-face positions with the first through-holes of the knife cylinder, the second push members being permitted to be abutted on the first push members respectively; and a pushing unit which is provided inside of the knife cylinder and pushes the first push members outwardly, and a spring member which is provided to apply elastic force to each of the first push members toward a center side of the knife cylinder so as to keep said each of the first push members to be held at an inner end of stroke thereof, wherein the second push members are moved outwardly by the pushing unit to push out punching scrap which remains in the punching blade after punching the sheet, and wherein the stroke of the first push members is controlled so as to keep outer ends of the first push members within the outer periphery of the knife cylinder.