Patent attributes
A method includes: a step of bending the blade member in the width direction; and a step of, after the bending process, bending the blade member in the thickness direction. In the width-direction bending step, the blade member is clamped by a pair of rotary press claws. In the thickness-direction bending step, a thickness-direction bending shaft, and a thickness-direction bending cylinder are included, a blade member passing hole is penetratingly formed in the thickness-direction bending shaft in a direction perpendicular to the axis of the thickness-direction bending shaft, first and second openings which are opposed respectively to outlet and inlet opening ends of the blade member passing hole are formed in the thickness-direction bending cylinder, and the blade member which is passed from the blade member passing hole to the first opening via the second opening is bent in the thickness direction by relatively rotating the thickness-direction bending shaft 31 and the thickness-direction bending cylinder.
