Reciprocating Devices for Forming, Folding, and/or Hemming and Methods Therefor

摘要

A hem is formed in two abutting surfaces of a work piece in a two-pass process in which the work piece is pre-hemmed by a reciprocating tool in a first pass and in which the hem is then formed from the pre-hem by the same reciprocating tool in a second pass upon inversion of the work piece. In especially preferred aspects, the reciprocating tool has an angled contact surface that cooperates with a corresponding static tool.