Stamping die for cutting and forming sheet material

Abstract

The present invention aims at providing a blade for use with a development device, method of manufacturing the same, die for manufacturing the same, and development device and image-forming device having the same that can more stably form a high quality image. The inventive blade is manufactured using a stamping die comprising an upper mold portion including a knockout, a lower mold portion including a punch and movable relative to the upper mold portion. In the stamping die, the knockout includes in cross section a first flat portion and a triangular projection portion that projects from the first flat portion, while the punch includes in cross section a second flat portion and a triangular groove portion formed on the second flat portion, and a first angle at which the triangular projection portion projects from the first flat portion is larger than a second angle at which the triangular groove portion is recessed from the second flat portion.

Dependencies are inferred from the claim text.