Patent attributes
In the width-direction bending step for the blade member, the blade member is clamped by a pair of rotary press claws 13, 14 from both sides in the thickness direction to be compressed in the thickness direction, whereby the compressed portion is extended in the longitudinal direction of the blade member and the blade member is bent in the width direction. In the thickness-direction bending step for the blade member, a working die portion comprises: a thickness-direction bending shaft 31; and a thickness-direction bending cylinder 32 which is fitted in a turning paired state onto the thickness-direction bending shaft. The thickness-direction bending shaft 31 and the thickness-direction bending cylinder 32 are relatively rotated, whereby the blade member is bent in the thickness direction.
