Patent ID: 6675688
Filing Date: 2004-01-13
Classification: B21D,Y10T

Abstract:
A modular conversion unit for converting a punching machine having a turret and a worktable, from a single-punch to a multiple-punch configuration, comprising: an upper main cylindrical magazine which is rotatably supported by said turret and is provided with a plurality of radial seats; punches; hammer elements; upper secondary cylindrical magazines, accommodated in said radial seats, each of which supporting a preset number of said punches and being surmounted by a corresponding one of said hammer elements which is fitted so as to rotate in a controlled manner; a hollow seat which is formed in said worktable and is provided with a corresponding number of further radial seats; a corresponding lower main cylindrical die-holder magazine which is accommodated so as to rotate synchronously with said upper cylindrical magazine and is vertically aligned coaxially thereto in said hollow seat; lower secondary die-holders, accommodated in said further radial seats, and are supported so as to be vertically aligned with said upper secondary magazines, each die-holder being provided with a plurality of dies the number whereof is equal to the number of said punches; a first motor means for producing a controlled rotation of said upper main cylindrical magazine with respect to said turret; a second motor means with alternating operation for actuating, in controlled rotation, said hammer elements with respect to the corresponding secondary cylindrical magazines; and a third motor means for actuating in a controlled rotation said lower main cylindrical magazine with respect to said hollow seat synchronously with said upper main magazine.