Fiber for reinforcing concrete or similar materials made of wire of a flat material strip and device for manufacturing such fibers

A device for manufacturing a fiber for reinforcing concrete from a material in a form selected from the group consisting of wire and a flat band, the fiber having:

• a linear center section with a first and a second end;
• a first intermediate section connected to said first end and a second intermediate section connected to said second end, said first and said second intermediate sections having a wavy shape and being shorter than said center section;
• and a first end section connected to said first intermediate section and a second end section connected to said second intermediate section, said device comprising:
• two oppositely and synchronously rotating stamping rollers each having an outer circumferential surface, said stamping rollers positioned relative to one another such that said outer circumferential surface of a first one of said stamping rollers is spaced at a distance from said outer circumferential surface of said second roller, said distance corresponding to a thickness of the fiber;
• each said outer circumferential surface having projections and depressions, with said projections of said first stamping roller engaging depressions of said second stamping roller and with depressions of said first stamping roller engaging projections of said second stamping roller;
• said first stamping roller comprising stamping elements connected within said outer circumferential surface and distributed in a circumferential direction of said first stamping roller with an identical angular displacement relative to one another, said stamping elements extending radially and having, viewed in a plane of rotation, a triangularly shaped free end projecting past said outer circumferential surface;
• and
• said second stamping roller comprising separate individual stamping abutments connected within said outer circumferential surface and distributed in a circumferential direction of said second stamping roller with said identical angular displacement relative to one another so as to correspond to said stamping elements, said stamping abutments extending radially and having, viewed in a plane of rotation, a planar free end flush with said outer circumferential surface, with a circumferential length of said angular displacement at said first and said second stamping rollers corresponding to a length of the fiber.