Patent ID: 9033857
Filing Date: 2015-05-19
Classification: B21D,B31D,B31F

Abstract:
1. A method for passing a length of sheet material having x number of longitudinal folds, said folds having a height of y through a plain die fold multiplier for forming a desired number of longitudinal folds and/or fold height in said sheet material comprising the steps of: forming a plain die fold multiplier comprising: a first plate; a second plate overlying said first plate, opposing top and bottom sections of said first and second plates, respectively, being configured to intermesh with one another in a substantially fixed manner permitting said sheet material to be continuously moved through said plain die fold multiplier, between a front end and a back end thereof; a guide section proximate said front end for aligning and guiding a first set of longitudinal folds of said sheet material into said plain die fold multiplier; and a fold section for receiving said sheet material from said guide section said fold section being configured for further folding said sheet material to double the number of longitudinal folds to 2X while halving the height of said longitudinal fold to y/2; entering said sheet material into said front end of said plain die fold multiplier for entry into said guide section, with said first set of longitudinal folds being nestled between intermeshing downwardly and upwardly projecting triangular guide members, respectively, formed in said guide section in said top and bottom overlying sections of said plain die fold multiplier; and moving said sheet material from said guide members into said fold section of said plain die fold multiplier, wherein said first set of longitudinal folds are passed between a pair of downwardly projecting adjacent triangular segments of said top section intermeshed with two adjacent triangular shaped depressions formed in said bottom section, whereby top edges of said longitudinal folds in said sheet material are forced downward into said two adjacent triangular shaped depressions, thereby causing said longitudinal original folds to be divided into two folds each having one-half the height of the associated original fold.