Patent ID: 7546757
Filing Date: 2009-06-16
Classification: B41J,Y10T

Abstract:
1. A metal plate working method comprising the steps of: pressing a first die onto a metal plate for press-forming a recess groove portion extending along and being spaced apart from an imaginary line, the recess groove portion defining a first portion and a second portion that is adjacent to the first portion along the imaginary line and that is higher in rigidity than the first portion; pressing a second die onto the metal plate for press-forming recess portion ends of which are aligned on the imaginary line, the second die having a predetermined number of male die pieces so that: wherein the recess groove portion has a bottom partially formed with a through hole, the first portion corresponds to a first part of the recess groove portion which has the bottom formed with the through hole, and the second portion corresponds to a second part of the recess groove portion.