An apparatus, for forming a row of slide fastener coupling element, comprises a continuously rotatable die wheel having an annular peripheral groove for receiving a row of coupling element blanks in folded fashion, and a punching unit for forming coupling heads on the blanks in the groove. The punching...http://www.google.es/patents/US4665613?utm_source=gb-gplus-sharePatente US4665613 - Apparatus for forming a row of coupling elements for slide fastener
Apparatus for forming a row of coupling elements for slide fastener
