Abstract: The sponge sealing member of the side seal is arranged on the roller opposed face of the seal arrangement portion so that the lower end face at the upstream side in the rotating direction of the developing roller is positioned to have the same face as the back end face of the seal arrangement portion and the upper end face at the downstream side is connected with the lower end face of the side portion of the blade back seal. The felt sealing member is arranged so that the upper end portion at the downstream side in the rotating direction of the developing roller is formed astride the lower end portion of the leaf spring member and the sponge sealing member, extends along the sponge sealing member, through the back end face of the seal arrangement portion and around to the lower face of the seal arrangement portion.

Abstract: A cartridge includes: a casing having a wall defining a developer accommodating portion inside the casing, a filling port being formed through the wall in fluid communication with the developer accommodating portion; a cylindrical wall portion formed on the wall at a circumferential edge of the filling port and protruding from the wall outside the casing, the cylindrical wall portion having an inner peripheral surface, an outer peripheral surface, and an end surface positioned between the inner peripheral surface and the outer peripheral surface; a closure member which is fitted in the cylindrical wall portion, while being in contact with the inner peripheral surface of the cylindrical wall portion, to close the filling port; and a protruding portion that is provided on at least one of the end surface and the closure member at its contact portion between the end surface and the closure member and that protrudes toward the other one of the end surface and the closure member.

Abstract: A developer cartridge including a frame, a developer carrying member, and an input gear member is provided. The frame includes a first side wall and a second side wall, and the first side wall and the second side wall extend in a length direction. The developer carrying member extends from the first side wall to the second side wall in a width direction perpendicular to the length direction. The developer carrying member includes a developer carrying member shaft rotatably supported by the first side wall and the second side wall, and the developer carrying member is rotatable about a first axis. The input gear member, for supplying a driving force for rotating the developer carrying member, is rotatably supported by the first side wall so as to be rotatable about a second axis. A first distance between the first axis and the second axis in the length direction is about 14.0 mm.

Abstract: A developing cartridge includes a developing roller, wherein a bias voltage is capable of being applied to the developing roller; and a developer-side electrode portion that is electrically connected with a shaft member of the developing roller, wherein the developer-side electrode portion is positioned at the bottom of the developing roller in order to apply the bias voltage to the developing roller, and the developing cartridge is capable of being mounted to an image holding body cartridge with an image holding body that holds a developing agent image formed by a development of an electrostatic latent image.

Abstract: A developer cartridge includes a cartridge cabinet configured to accommodate developer. The cartridge cabinet includes a cartridge-side opening that allows communication between an inside of the cartridge cabinet and an outside of the cartridge cabinet, and a slope provided at a lower edge of the cartridge-side opening, the slope inclining in a direction crossing a horizontal direction when the cartridge-side opening is oriented in a horizontal direction.

Abstract: A developer cartridge including a frame, a developer carrying member, and an input gear member is provided. The frame includes a first side wall and a second side wall, and the first side wall and the second side wall extend in a length direction. The developer carrying member extends from the first side wall to the second side wall in a width direction perpendicular to the length direction. The developer carrying member includes a developer carrying member shaft rotatably supported by the first side wall and the second side wall, and the developer carrying member is rotatable about a first axis. The input gear member, for supplying a driving force for rotating the developer carrying member, is rotatably supported by the first side wall so as to be rotatable about a second axis. A first distance between the first axis and the second axis in the length direction is about 14.0 mm.

Abstract: An image forming apparatus includes a photosensitive drum, a developing roller, a photosensitive drum driving unit, a developing roller driving unit, and a driving control unit. An electrostatic latent image is formed on the photosensitive drum. The developing roller is disposed facing the photosensitive drum and supplies a developing agent to the electrostatic latent image formed on the photosensitive drum to develop the electrostatic latent image to developing agent image. The photosensitive drum driving unit rotatably drives the photosensitive drum. The developing roller driving unit rotatably drives the developing roller. The driving control unit controls the photosensitive drum driving unit and controls the developing roller controlling unit so that a circumferential speed ratio of the developing roller with respect to the photosensitive drum becomes a circumferential speed ratio which corresponds to a circumferential speed of the photosensitive drum.

Abstract: A charger is opposed to a charging subject member and charges the charging subject member by generating corona discharge. The charger includes: a discharge electrode; and a pair of facing electrodes that are disposed to face with each other being the discharge electrode interposed therebetween and arranged to be distant from the discharge electrode, wherein the facing electrodes are arranged that an interval between the facing electrodes gradually decreases towards the charging subject member.

Abstract: The sponge sealing member of the side seal is arranged on the roller opposed face of the seal arrangement portion so that the lower end face at the upstream side in the rotating direction of the developing roller is positioned to have the same face as the back end face of the seal arrangement portion and the upper end face at the downstream side is connected with the lower end face of the side portion of the blade back seal. The felt sealing member is arranged so that the upper end portion at the downstream side in the rotating direction of the developing roller is formed astride the lower end portion of the leaf spring member and the sponge sealing member, extends along the sponge sealing member, through the back end face of the seal arrangement portion and around to the lower face of the seal arrangement portion.

Abstract: The sponge sealing member of the side seal is arranged on the roller opposed face of the seal arrangement portion so that the lower end face at the upstream side in the rotating direction of the developing roller is positioned to have the same face as the back end face of the seal arrangement portion and the upper end face at the downstream side is connected with the lower end face of the side portion of the blade back seal. The felt sealing member is arranged so that the upper end portion at the downstream side in the rotating direction of the developing roller is formed astride the lower end portion of the leaf spring member and the sponge sealing member, extends along the sponge sealing member, through the back end face of the seal arrangement portion and around to the lower face of the seal arrangement portion.

Abstract: The blade back seal and the sponge sealing member are interposed between the leaf spring member and the blade attachment unit and seal arrangement portion while being compressed to have the same thickness, by applying the blade back seal having a relatively small elastic modulus and a large thickness to the blade attachment unit and the seal arrangement portion, applying the sponge sealing member having a relatively large elastic modulus and a small thickness onto the roller opposed face of the seal arrangement portion and pressing them by the leaf spring member of the blade unit.

Abstract: A process cartridge includes an image bearing member, a brush, and a supporting portion. The brush includes a base member having an elongated plate shape that extends in the longitudinal direction, a brush member including bristles provided on the front surface of the base member, and mounting portions formed at both latitudinal ends of the base member. The supporting portion includes holding portions that hold the mounting portions formed at the both latitudinal ends of the base member, thereby supporting the brush with respect to the image bearing member.

Abstract: An image forming apparatus includes a housing, an image carrier unit configured to move along a first direction between a first position and a second position in the housing and to hold image carriers, developing cartridges configured to be removably mounted in the image carrier unit, and an exposure unit disposed in the housing and for generating light to irradiate each image carrier. Each developing cartridge includes a developer carrier for supplying developer to the image carrier, a case configured to contain the developer and having a support portion for supporting the developer carrier at a first side of the case and a pair of sidewalls facing each other in a second direction perpendicular to the first direction, and an urging mechanism disposed at a second side of the case opposite to the first side for contacting the exposure unit when the image carrier unit is in the first position.

Abstract: An image forming apparatus that includes: a process unit; a driving source; a first driving unit that rotates when a rotation driving force generated by the driving source is transmitted; and a connection switching unit that switches between a transmission state in which the rotation driving force is transmitted to the first driving unit and a non-transmission state. The process unit includes: a transmission permission unit that switches a state of the connection switching unit into the transmission state, when the process unit exists at a process mounting location with respect to the image forming apparatus; and a second driving unit that joints with the first driving unit when the process unit exists at the process mounting location and rotates a rotation driving subject in the process unit by a rotation force of the first driving unit.

Abstract: A developer cartridge is attachable to and detachable from an image forming unit. The developer cartridge includes a developer roller and an electrode member electrically connected to the developer roller. The electrode member faces in an attachment direction along which the developer cartridge is attached to the image forming unit. The electrode is configured to contact a power supply member disposed at the image forming unit.

Abstract: A developer cartridge is attachable to and detachable from an image forming unit. The developer cartridge includes a developer carrier, an input gear rotatable about a rotating axis, the input gear communicating with the developer carrier, an electrode member that is electrically connected with the developer carrier, the electrode member including a first contact where the electrode member contacts a power supply member provided in the image forming unit, a supported member that includes a second contact where the supported member is supported by a supporting member provided in the image forming unit, an imaginary plane orthogonal to the rotating axis of the input gear is defined, the input gear, the electrode member, and the supported member being projected in the imaginary plane, and an imaginary line that connects the first contact and the second contact in the imaginary plane is defined.