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A punch apparatus for punching holes in thin sheet material including a frame, a punch element mounted on the frame for rectilinear movement, which further includes a planar element of conductive material mounted on the punch element, a coil on the frame mounted adjacent to the planar element, a car

A punch apparatus for punching holes in thin sheet material including a frame, a punch element mounted on the frame for rectilinear movement, which further includes a planar element of conductive material mounted on the punch element, a coil on the frame mounted adjacent to the planar element, a carriage for supporting and positioning the sheet in the path of the punch element, leads connected to a source of electric current to energize the coil, a mechanical arrangement to rebound the punch element, and a programmable apparatus to selectively move the carriage and energize the coil to thereby produce a punched hole pattern in the sheet.

대표청구항 ▼

A programmable punch apparatus for punching hole patterns in thin sheet material including a frame, and a punch element mounted on said frame for rectilinear movement, comprising: a punch element; a collar element directly mounted on said punch element; a substantially planar element of highly condu

A programmable punch apparatus for punching hole patterns in thin sheet material including a frame, and a punch element mounted on said frame for rectilinear movement, comprising: a punch element; a collar element directly mounted on said punch element; a substantially planar element of highly conductive material directly mounted on said collar element normal to the direction of movement, wherein the diameter of said planar element is substantially greater than the diameter of said collar; a planar coil fixedly mounted on said frame of said punch apparatus coaxially with said punch element and adjacent to said planar element, carriage means for positioning a thin sheet of material to be punched in the path of said punch element, and moving said sheet material in directions transverse to the axis of said punch element, means for energizing said coil with a pulse of electrical energy for generating flux linking said conductive planar element to repel said planar element from said coil, a means to rebound said punch element, at least a part of which is affixed to said punch element, programmable means to selectively move said carriage means to specifically locate said sheet relative to said punch element, and activate said means for energizing said coil to thereby produce a predetermined punched hole pattern in said sheet.