Patent ID: 7918775
Filing Date: 2011-04-05
Classification: B31F,B42C,B65H

Abstract:
1. A device for producing a hinge-like bending line in a cover sheet transported in a transport direction, comprising: upper and lower tools having respective first and second rotary tool members driven in opposite directions about respective parallel rotation axes; said first rotary tool member having a circumferentially continuous projecting tool edge, and said second rotary tool member having a circumferentially continuous outside forming surface that is inclined relative to the rotational axis of the second rotary tool member; a cover sheet passing between the upper and lower rotating tools; with the projecting edge of the first rotary tool member and the outside forming surface producing a bending line on the cover sheet by roll bending the sheet without scoring the sheet with a scoring bead; wherein said first rotary tool member has a single, circumferentially continuous, radially outward projection, and said second rotary tool member has a single, circumferentially continuous, radially outward projection; and wherein each projection has outwardly converging sides including a side that is inclined relative to the respective rotational axis such that the converging sides of the projection on the first tool member define the projecting tool edge which confronts and cooperates with a single inclined side of the projection on the second tool member defining the outside forming surface.