An image forming apparatus includes: a toner cartridge; a drum cartridge to which the toner cartridge is attachable; and a controller. The toner cartridge is configured to accommodate toner therein. The toner cartridge includes a toner memory. The drum cartridge includes: a photosensitive drum; and a drum memory. The controller is configured to perform: a first determination process to determine whether communication with the drum memory is established; and after determining in the first determination process that the communication with the drum memory is established, a second determination process to determine whether communication with the toner memory is established.

An image forming apparatus includes a photosensitive drum, a photoreceptor housing, a developing roller, a development housing, first contact members and second contact members. The first contact members are provided in end portions of the photoreceptor housing in an axial direction of the photosensitive drum. The second contact members are provided in end portions of the development housing in the axial direction, and come into contact with the first contact members by a force in which the development housing is pushed toward the photoreceptor housing. A position of at least one of the first contact member and the second contact member can be adjusted in a direction in which the first contact member and the second contact member come close to each other or separate away from each other.

A photosensitive member unit includes a photosensitive member, a charging roller, a charging roller bearing member, a gear, a separation member having an engagement portion, a guide portion, and a frame to support the photosensitive member. The guide portion guides the charging roller bearing member urged by a urging member to separate the charging roller from the photosensitive member in a state where the engagement portion and the gear are engaged with each other and guides the charging roller bearing member urged by the urging member so that the charging roller comes into contact with the photosensitive member in a state where the engagement portion and the gear are not engaged. A distance between the urged charging roller bearing member and the frame is less than a length in which the engagement portion and the gear are engaged in the state where the engagement portion and the gear are engaged.

A controller is configured to control a print engine and a conveyor to form an image on both sides of a sheet. The controller is configured to: in a case where images to be formed on both sides of each of an Nth (N is a positive integer) sheet, an (N+1)th sheet, and an (N+2)th sheet are all monochrome image or all color image, convey the (N+2)th sheet to the print engine and form an image before forming an image on both sides of the (N+1)th sheet; and in a case where the images to be formed on both sides of each of the Nth sheet, the (N+1)th sheet, and the (N+2)th sheet are a mixture of the monochrome image and the color image, convey the (N+2)th sheet to the print engine and form an image after forming an image on both sides of the (N+1)th sheet.

A process cartridge including a first frame member molded by pouring a resin from a gate; a conductive sheet adhered integrally to a sheet adhering portion of the first frame member by molding of the resin; and a second frame member configured to define a toner storage portion by being coupled with the first frame member, wherein, the first frame member includes a bent portion at the sheet adhering portion, and a portion of the first frame member different in thickness is provided at an adjacent position to the adhering portion.

The engagement between a fixing member and a resin member is released and the resin member is separated from a frame thereby separating a bearing member from the frame. Parts to be used in a developing device are replaced or the developing device is replenished with a developer. The resin member is connected to the frame to connect the bearing member to the frame. The fixing member is inserted into a through hole to engage with the resin member and fix the resin member to the frame, thereby fixing the bearing member to the frame.

A replaceable unit for an electrophotographic image forming device includes a housing having a reservoir for holding toner. An electrical connector is positioned on a first side of the housing. The electrical connector includes an electrical contact for contacting a corresponding electrical contact in the image forming device. The electrical contact of the replaceable unit is electrically connected to processing circuitry mounted on the housing. The electrical connector is movable between a first position and a second position. The electrical contact of the replaceable unit moves outward from the first side of the housing along a side-to-side dimension of the housing when the electrical connector moves from the first position to the second position. The electrical contact of the replaceable unit faces downward when the electrical connector is in the second position permitting the corresponding electrical contact to contact the electrical contact of the replaceable unit from below.

An image forming apparatus includes: a main casing; a toner cartridge including a toner casing having a toner outlet for discharging toner in the toner cartridge and a toner shutter for opening and closing the toner outlet; a drum cartridge including a photosensitive drum and a developing unit including a developing casing having a toner inlet for receiving the toner from the toner cartridge, a developing shutter for opening and closing the toner inlet, and a cushion member positioned between the developing casing and the developing shutter. When the developing casing is moved relative to the photosensitive drum while the drum cartridge and the toner cartridge are attached to the main casing, the developing shutter opens the toner inlet, and the toner shutter opens the toner outlet, the cushion member allows movement of the developing casing relative to the developing shutter while the developing shutter engages with the toner cartridge.

A cartridge including: a first unit including an image bearing member and a first portion, and configured to take a removal posture when the cartridge is to be removed from a main body; a second unit including a developer bearing member and a second portion, the second unit being movable between a first position where the developer bearing member is in contact with the image bearing member and a second position where the developer bearing member is separated from the image bearing member and where the second portion is in contact with the first portion, wherein when the first unit takes the removal posture, the second unit is located at the second position, and when the second unit is located at the second position, movement of the second unit in a direction, in which the developer bearing member is separated from the image bearing member, is restricted.

An image forming device, including: a housing; a drawer movable between an inside position at which the drawer is located inside the housing and an outside position at which the drawer is located outside the housing; a drum cartridge including a photoconductive drum and a developer roller and mountable on the drawer; a toner cartridge storing toner to be supplied to the developer roller and mountable on the drawer, wherein the drawer includes a first guide that guides the toner cartridge in mounting the toner cartridge on the drawer, and wherein the drum cartridge includes a second guide connected to the first guide in a state in which the drum cartridge is mounted on the drawer, the second guide being configured to guide the toner cartridge in mounting the toner cartridge on the drawer in the state in which the drum cartridge is mounted on the drawer.