Abstract: A developer container for accommodating a developer used for developing an electrostatic latent image formed on an electrophotographic photosensitive member by a developing member for developing the electrostatic latent image includes, a first light-transmitting window for guiding detection light emitted from a light emitting member provided in a main body of an image forming apparatus into the developer container, a second light-transmitting window for guiding the detection light entering from the first light-transmitting window and passing through the developer container to a photosensing member provided in the main body of the image forming apparatus, in order to detect the remaining amount of the developer accommodated within the developer container when the developer container is mounted in the main body of the image forming apparatus, and a rotatable feeding member including a stirring blade for feeding the developer within the developer container toward the developing member when rotating, and for remo

Abstract: In order to provide a developing device and a process cartridge that are capable of preventing leakage of developer at low cost, for example, a developing device includes a container for containing a developer; a developer collecting member, a flexible sheet, a developer separating member, and a developer collecting member mounted at least a part of which is provided on an upper surface of the flexible sheet and which is provided so as to be free of contact with the developing roller, for preventing spurt of developer from a gap between the photosensitive drum and the developing device container. A process cartridge for an image forming apparatus includes a photosensitive drum and the previously-described developing device.

Abstract: A developing cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, the developing cartridge includes a developing roller, for developing an electrostatic latent image formed on an electrophotographic photosensitive member, having an elastic roller portion and a shaft portion supporting the elastic roller portion, a developer regulating member contactable to the elastic roller portion to regulate an amount of the developer deposited on the elastic roller portion; a protecting member including a contact portion provided at a side for contact with the elastic roller portion when the protecting member is demountably mounted between the developing roller and the developer regulating member; and a supporting portion for supporting the contact portion, the supporting portion being provided at a side for contact with the elastic roller portion when the protecting member is demountably mounted between the developing roller and the developer regulating member, wherein the

Abstract: A developing cartridge detachably mountable to an electrophotographic image forming apparatus, the apparatus includes a frame; a developing roller for developing an electrostatic latent image formed on an electrophotographic photosensitive drum; an one-end frame groove provided at one longitudinal end of the frame; an one-end frame projection provided at the one longitudinal end of the frame; one-end bearing for rotatably supporting one-end shaft provided at one longitudinal end of the developing roller extended in a longitudinal direction of the frame; an one-end bearing cylinder, provided on the one-end bearing, engaged with an inner surface of the one-end frame groove; an elongated bearing opening which is provided on the one-end bearing and through which the frame one end projection is penetrated; a first projection of metal provided on an outer surface of the one-end bearing opposite from an inner side surface on which the one-end bearing cylinder is provided; a second projection of metal which is provid

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes a first frame; a second frame coupled with the first frame for rotation about a shaft; an electrophotographic photosensitive drum provided in the first frame; a developing member, provided in the second frame, for developing an electrostatic latent image formed on the photosensitive drum with a developer; a developing member, provided in the second frame, for developing an electrostatic latent image formed on the photosensitive drum with a developer; an elastic member for applying an elastic force between the first frame and the second frame to urge the developing member to the photosensitive drum; a force receiving portion, provided downstream of the shaft with respect to a mounting direction in which the process cartridge is mounted to the main assembly of the image forming apparatus, for receiving a force from the main assembly of the image forming apparatus to keep the developing member

Abstract: An electrophotographic photosensitive drum for use in an electrophotographic image forming apparatus including: a cylinder; and flanges provided on end portions in the axial direction of the cylinder, wherein the flange has an outer peripheral portion, a hole portion and ribs, and the flange is caulked by bending part of the cylinder inwardly in the radius direction at two positions opposing each other across the hole portion, those two positions being other than positions at which the ribs intersect the outer peripheral portion in directions of the extending direction of the ribs.

Abstract: A developing apparatus includes a developer carrying member for carrying a developer thereon. An electrostatic image is formed on an image bearing member with the developer. A rotatable developer electrifying member contacts the developer carrying member and electrifies the developer carried on the developer carrying member. A holding member supports the developer electrifying member and the developer carrying member. A bearing assembled to the holding member receives a shaft of the developer electrifying member. The developer electrifying member is held by the holding member through the bearing member.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes a first frame; a second frame coupled with the first frame for rotation about a shaft relative to each other; a photosensitive drum provided in the first frame; a charging member, provided in the first frame, for charging the drum; a developing member, provided in the second frame, for developing a latent image on the drum with a developer; a developer feeding member, provided in the second frame, for supplying a developer onto a peripheral surface of the developing member; a regulating member, provided in the second frame, for regulating an amount of the developer deposited on peripheral surface of the developing member; a first electrical contact, provided in the first frame, for receiving, from the main assembly, a bias voltage to be supplied to the charging member; a third electrical contact, provided in the second frame, for receiving, from the main assembly, a bias voltage to be suppli

Abstract: In order to provide a developing device and a process cartridge that are capable of preventing leakage of developer at low cost, for example, a developing device comprises: a container, having an opening, for containing a developer; a developer carrying member, rotatably disposed in the opening, for carrying developer; and a developer collecting member mounted to the opening of the container so as to be kept out of contact with the developer carrying member.

Abstract: A developer container for accommodating a developer used for developing an electrostatic latent image formed on an electrophotographic photosensitive member by means of a developing member for developing the electrostatic latent image includes, a first light-transmitting window for guiding detection light emitted from a light emitting member provided in a main body of an image forming apparatus into the developer container, in order to detect a remaining amount of the developer accommodated within the developer container when the developer container is mounted in the main body of the image forming apparatus, a second light-transmitting window for guiding the detection light entering from the first light-transmitting window and passing through the developer container to a photosensing member provided in the main body of the image forming apparatus, in order to detect the remaining amount of the developer accommodated within the developer container when the developer container is mounted in the main body of the

Abstract: A developing apparatus includes a developer carrying member for carrying a developer thereon, and developing an electrostatic image formed on an image bearing member with the developer, a rotatable developer electrifying member for contacting with the developer carrying member, and electrifying the developer carried on the developer carrying member, a holding member for supporting the shaft of the developer electrifying member, the developer electrifying member being held by the holding member through the bearing member.

Abstract: A process cartridge detachably mountable to a main assembly of an electrophotographic image forming apparatus, includes a first frame; a second frame coupled with the first frame for rotation about a shaft; an electrophotographic photosensitive drum provided in the first frame; a developing member, provided in the second frame, for developing an electrostatic latent image formed on the photosensitive drum with a developer; a developing member, provided in the second frame, for developing an electrostatic latent image formed on the photosensitive drum with a developer; an elastic member for applying an elastic force between the first frame and the second frame to urge the developing member to the photosensitive drum; a force receiving portion, provided downstream of the shaft with respect to a mounting direction in which the process cartridge is mounted to the main assembly of the image forming apparatus, for receiving a force from the main assembly of the image forming apparatus to keep the developing member