Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the process cartridge includes a photosensitive member unit having a photosensitive drum; a developer carrying member for developing an electrostatic latent image formed on the photosensitive drum with a developer; a toner accommodating unit having a developer accommodating portion accommodating the developer to be used for development of the electrostatic latent image, the toner accommodating unit being fixed to the photosensitive member unit; a movable frame which is movable relative to the toner accommodating unit and which supports the developer carrying member; an urging member for urging the movable frame in a direction in which the developer carrying member approaches the photosensitive drum; and a space maintaining member, demountably provided between the photosensitive member unit and the movable frame in contact to the photosensitive member unit and the movable frame, for maintaining a stat

Abstract: A developing device includes: a developing roller; a magnet provided in the roller and having a plurality of local maximum magnetic flux density positions on the peripheral surface of the magnet; a developing container supporting the roller; a seal member for preventing a developer from leaking out of the container; and a developer regulating member having a scraping member abutting the roller for collecting the developer on the surface of the roller toward the inside of the container in the axial direction. When viewing the developing device in the axial direction, the scraping member abuts the roller between a first position where the surface of the roller is crossed by a line which connects the supporting portion and a local maximum magnetic flux density position that is nearest to the supporting portion, and a second position where the roller develops the latent image.

Abstract: A developing apparatus for an electrophotographic image forming apparatus, the developing apparatus includes a developing means for developing an electrostatic latent image formed on an electrophotographic photosensitive member; a developer accommodating container for accommodating a developer to be used by the developing member; a first stirring member for receiving a driving force from a main assembly of the electrophotographic image forming apparatus to star the developer accommodated in the developer accommodating container; and a second stirring member for stirring the developer accommodated in the developer accommodating container. The second stirring member is rotatable by being contacted by the first stirring member rotated through a predetermined angle when the first stirring member receives the driving force from the main assembly of the apparatus. The first stirring member stirs at least a part of a region of the developer which is stirred by the second stirring member.

Abstract: A developing device includes: a developing roller for developing an electrostatic latent image formed on an electrophotographic photosensitive member; a magnet provided in the roller and having a plurality of local maximum magnetic flux density positions on the peripheral surface of the magnet; a developing container supporting the roller; a seal member for preventing a developer from leaking out of the container; a developer regulating member having an elastic portion abutting the roller and a metal supporting portion supporting the elastic portion for regulating an amount of developer on the surface of the roller; and a scraping member abutting the roller for collecting the developer on the surface of the roller toward the inside of the container in the axial direction.

Abstract: A developing apparatus for an electrophotographic image forming apparatus, the developing apparatus includes developing means for developing an electrostatic latent image formed on an electrophotographic photosensitive member; a developer accommodating container for accommodating a developer to be used by the developing means; a first stirring member for receiving a driving force from a main assembly of the electrophotographic image forming apparatus to star the developer accommodated in the developer accommodating container; and a second stirring member for stirring the developer accommodated in the developer accommodating container, the second stirring member being rotatable by being contacted by the first stirring member rotated through a predetermined angle when the first stirring member receives the driving force from the main assembly of the apparatus, wherein the first stirring member stirs at least a part of a region of the developer which is stirred by the second stirring member.