초록 ▼

A blade is pressed against a developing roller for regulating the amount of toner which is deposited on a surface of the developing roller. The blade is formed with a slant face at its tip end, to which the toner is transported along a direction of rotation of the developing roller. An angle of aper

A blade is pressed against a developing roller for regulating the amount of toner which is deposited on a surface of the developing roller. The blade is formed with a slant face at its tip end, to which the toner is transported along a direction of rotation of the developing roller. An angle of aperture .theta. at a toner inlet portion defined by the developing roller and the slant face is set at 12.5.degree. or more, the angle of aperture counting in an angle .psi. of the slant face, elastic deformation and radius (R) of the developing roller, and an angle .alpha. related to a nip width w on which the blade contacts with the developing roller. Such an angle of aperture .theta. provides a great allowance for a free length l of the blade, thereby permitting the blade to maintain a constant toner mass for forming a uniform toner layer.

대표청구항 ▼

[ What is claimed is:] [15.] A developing apparatus using one-component toner comprising:a developing roller for carrying and transporting one-component toner to a developing region opposing an image bearing member bearing an electrostatic latent image; anda blade for regulating an amount of one-com

[ What is claimed is:] [15.] A developing apparatus using one-component toner comprising:a developing roller for carrying and transporting one-component toner to a developing region opposing an image bearing member bearing an electrostatic latent image; anda blade for regulating an amount of one-component toner carried on the developing roller,wherein the blade pressed against the developing roller is formed with a slant face at a tip end thereof, the slant face being inclined so that a distance between the slant face and the developing roller is gradually reduced along a direction of incoming toner, andwherein the slant face of the blade is formed by a step at tip end of the sheet-like member constructing the blade and a metal foil piece placed over the tip end of the sheet-like member so as to cover the step formed therein.