PERFORATING MACHINE AND METHOD

摘要

A method and machine for impressing a row of longitudinal perforations in a material such as a steel pipe. A female die engages one surface of the metal, and a cutter positioned on the other side cuts and forms the perforations as it is advanced longitudinally. The cutter has a rotatable head provided with a number of teeth that register with the die to cut and form the perforations as the cutter advances. The preferred embodiment includes ratchet means for shifting the material to a new position upon completion of a row of perforations.