US 7,257,353 B2Granted

Developing apparatus

AssigneeCanon Kabushiki Kaisha

InventorsTachio Kawai, Seiji Yamaguchi, Syuhei Kawasaki

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Abstract

A developing apparatus develops a latent image formed on an electrophotographic photosensitive member with a developer in an electrophotographic image forming apparatus The device includes a developer accommodating portion and a developer stirring member stirring the developer in the developer accommodating portion. The developer stirring member includes a rotatable member rotatably provided in the developer accommodating portion, first and second stirring rotatable portions provided on the rotatable member, and first and second movable stirring portions movably provided on the first and second stirring rotatable portions, respectively. The radius of rotation of the first and second stirring rotatable portions are different from each other, and a part of a stirring region in which the first stirring rotatable portion and the first movable stirring portion stir the developer and a part of a stirring region in which the second stirring rotatable portion and the second movable stirring portion stirs the developer, overlap.

Claims11

Dependent claims

A developing apparatus for developing an electrostatic latent image formed on an electrophotographic photosensitive member with a developer in an electrophotographic image forming apparatus, said developing apparatus comprising:

a developer accommodating portion configured to accommodate the developer to be supplied to a developing member;
a developer stirring member configured and positioned to stir the developer in said developer accommodating portion, said developer stirring member including a rotatable member rotatably provided in said developer accommodating portion, a first stirring rotatable portion provided on said rotatable member, a first movable stirring portion movably provided on said first stirring rotatable portion, a second stirring rotatable portion provided on said rotatable member, and a second movable stirring portion movably provided on said second stirring rotatable portion, and
wherein a radius of rotation of said first stirring rotatable portion and a radius of rotation of said second stirring rotatable portion are different from each other, and a part of a stirring region in which said first stirring rotatable portion and said first movable stirring portion stir the developer and a part of a stirring region in which said second stirring rotatable portion and said second movable stirring portion stir the developer, overlap.

Dependencies are inferred from the claim text.