Rotary dies with adjustable cutter force
AssigneeBernal Rotary Systems, Inc.
InventorsJerry L. Bell, William C. Bollinger
Life of this patent
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Abstract
Coacting die cylinders with one cylinder having a cutting blade and the other cylinder an anvil surface which when rotating cooperate to cut a blank from a web of low density material. The blade and the anvil surface are tapered in opposite axial directions so that the clearance between them can be readily varied and adjusted by moving the cylinders axially relative to each other. Preferably, the cylinders each have a pair of cylindrical bearers which are in contact and rolling engagement with each other when the cylinders are operating to cut a web of material. The die cylinders are journaled in bearing assemblies carried by the cylinders and removably received in the stand to facilitate easy removal and installation of the die cylinders when desired.
Claims9
Cylindrical dies which when rotating cut along a predetermined line of severance in a web of material which comprises:
- a pair of coacting die cylinders of metal constructed and arranged to be journaled for rotation, one of said cylinders having an anvil surface thereon which is essentially a frustum of a right circular cone with its axis essentially coincident with the axis of rotation of said one cylinder, at least one cutting blade on said other cylinder and having a sharp edge with its apex essentially throughout its length lying in a blade surface which is essentially a frustum of a right circular cone with its axis coincident with the axis of rotation of said other cylinder, said blade surface and said anvil surface tapering in axially opposite directions and both having essentially the same rate of taper, whereby when the coacting cylinders are in assembly with their axes of rotation essentially parallel and spaced apart a constant distance the clearance between the apex of the cutting blade and the anvil surface can be varied and adjusted by relatively moving the die cylinders axially to vary the minimum clearance between the cutting blade and the anvil surface.
Dependencies are inferred from the claim text.