Patent ID: 7757532
Filing Date: 2010-07-20
Classification: B21D

Abstract:
1. A method of bending a strip-like blade member having a blade edge in one end edge in a width direction, with a blade member bending apparatus including: a working die portion; a pair of rotary press claws disposed in the working die portion; a thickness-direction bending shaft a thickness-direction bending cylinder which is fitted in a turning paired state onto the thickness-direction bending shaft a strip-like blade member passing hole which is penetratingly formed in the thickness-direction bending shaft in a direction perpendicular to an axis of the thickness-direction bending shaft, and which allows the strip-like blade member to pass there-through; and first and second openings which are opposed respectively to outlet and inlet opening ends of the strip-like blade member passing hole, comprising the steps of: intermittently feeding the strip-like blade member to the working die portion performing a bending process by the working die portion during stoppage of said intermittently feeding of the strip-like blade member, said bending process includes: a width-direction bending step for bending the strip-like blade member in a width direction; and a thickness-direction bending step for bending the strip-like blade member in a thickness direction; clamping the strip-like blade member in said width-direction bending step by the pair of rotary press claws disposed in the working die portion, from both sides in the thickness direction to be compressed in the thickness direction, whereby the compressed portion of the strip-like blade member is extended in a longitudinal direction of the strip-like blade member, and the strip-like blade member is bent in the width direction; disposing a predetermined gap between an outer peripheral face of an outlet forming portion of the strip-like blade member passing hole in the thickness-direction bending shaft, and an inner peripheral face of a first-opening forming portion in the thickness-direction bending cylinder; relatively rotating the thickness-direction bending shaft and the thickness-direction bending cylinder, whereby the strip-like blade member which is passed from the strip-like blade member passing hole to the first opening via the second opening is bent in the thickness direction; said width-direction bending process is performed by a configuration where said pair of rotary press claws are attached to a pair of rotary press driving shaft and rotary press driven shaft which are opposed in a vertical posture to each other on both sides across said blade member, in a manner that said rotary press claws are rotatable in opposite directions, so that tip end edges of said claws are projected to outsides of said shafts, respectively, and said pair of rotary press driving shaft and rotary press driven shaft are relatively rotated to cause said rotary press claws to approach each other; said thickness-direction bending process is performed by a configuration where said thickness-direction bending shaft is formed into a cylindrical shape and fixed, said pair of rotary press driving shaft and rotary press driven shaft are housed in said thickness-direction bending shaft, a rotary press cylinder having blade member passing holes is inserted in a manner that said blade member passing holes communicate with said blade member passing hole of said thickness—direction bending shaft, and said thickness—direction bending cylinder which is fitted in a turning paired state onto said thickness-direction bending shaft is rotated; and said thickness-direction ending process is performed by tilting said thickness-direction bending shaft and said thickness-direction bending cylinder with respect to said blade member so as to coincide with a curvature of said blade member which has been bent in the width direction.