US 2012/0111166 A1Published application

Punching scrap removal device and blade mount for rotary die cutter

AssigneeMitsubishi Heavy Industries Printing & Packaging Machinery, Ltd.

InventorsHironari Yamada, Osamu Hatano

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Abstract

It is intended to improve work efficiency by eliminating the work of attaching and removing push rods during installing and dismounting the a blade mount and also to reduce abrasion of the push rods for pushing punching scrap out of a punching blade. The first push rods 18 are inserted movably in the first through-holes 16 formed in the knife cylinder and the second push rods 36 are inserted movably in the second through-holes 34 formed in the blade mount to permit the second push rods 36 to be abutted on the first push rods 18. A scrap push lever 30 is mounted on the outer end of the second push rod 36 to push out the punching scrap a and an eccentric cylinder 14 is provided inside of the knife cylinder 10 to push the first push rod 18 outward when pushing out the punching scrap a. The stroke of the first push rod 18 is controlled so that the outer end 18a of the first push rod 18 does not project from the outer periphery 10a of the knife cylinder. The first push rod 18 and the second push rod 36 are preferably made from one of self-lubricating resin and abrasion-resistant material.

Claims14

Dependent claims

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.

4 more elements

A blade mount for a rotary die cutter which comprises a knife cylinder and an anvil cylinder arranged in contraposition to the knife cylinder, the punching blade punching a sheet to be processed that is passed between the knife cylinder and the anvil cylinder, the blade mount comprising:

a punching blade which is installed on the blade mount;
a plurality of first push members which are movably installed in a plurality of first through-holes respectively, the first through-holes being provided 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 provided 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,
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 stroke of the first and second push members is controlled by an opening width of the aperture of the punching blade.

4 more elements

Dependencies are inferred from the claim text.