Abstract: An image forming apparatus includes a first display portion to display a ratio of an amount of toner accommodated in the developer container to a maximum amount of toner that the developer container is capable of accommodating, and a controller to, in a case where a replenishment operation, in which toner is supplied from the replenishment container to the replenishment port, is performed when a second display portion is in a second state, switch the second display portion from the second state to a first state and perform a display processing of displaying, on the first display portion, the ratio corresponding to an amount of toner accommodated in the developer container after the replenishment operation.

Abstract: An image forming apparatus includes an apparatus body, a cartridge attachable to and detachable from the apparatus body, a replenishment restriction portion configured to switch between a restricting state in which toner replenishment through a replenishment port is restricted and an allowing state in which toner replenishment through the replenishment port is allowed, a toner remainder amount detection portion, and a controller. The controller is configured to, when the replenishment container is attached to the replenishment port, maintain the replenishment restriction portion in the restricting state in a case where a second printable sheet number is larger than a first printable sheet number, with the first printable sheet number being obtained from a lifetime of the cartridge, and the second printable sheet number being obtained from a sum of the amount of toner accommodated in the developer container and an amount of toner accommodated in the replenishment container.

Abstract: An image forming apparatus includes a photosensitive member, a transfer member, a transfer power source, and a control unit. At a start time of a start-up operation at the time of starting an image forming operation, on the surface of the photosensitive member, a first position coincides with a charging position, and a third position coincides with a transfer position. During a period in which an area on the photosensitive member located between the first position and the third position in a rotation direction of the photosensitive member passes the transfer position, the control unit performs control of applying a first voltage having the same polarity as a normal charging polarity of toner to the transfer member by the transfer power source, and, at a predetermined timing, changing a voltage from the first voltage to a second voltage having an absolute value less than that of the first voltage.

Abstract: An image forming apparatus includes a photosensitive member; an exposure portion configured to expose the photosensitive member to light depending on image information to form a latent image on the photosensitive member; a developing portion configured to develop the latent image into a toner image with toner; and a transfer portion configured to transfer the toner image from the photosensitive member onto a recording material. The image forming apparatus changes a surface movement speed of the photosensitive member at timing prior to predetermined timing, when a moving speed of a recording material at the transfer portion changes, by a predetermined time.

Abstract: Provided are an image bearing member; a charging member that charges the image bearing member; an exposure unit that exposes the image bearing member; a developing unit that develops an electrostatic latent image as a developer image by supplying a developer, charged to regular polarity, to the image bearing member; a transfer member that transfers the developer image to a transfer-receiving body; and a collecting member that collects a deposit on the image bearing member downstream of a transfer portion of the image bearing member at which the developer image is transferred to the transfer-receiving body by the transfer member, and upstream of a charging portion of the image bearing member charged by the charging member, in a rotation direction of the image bearing member. After transfer of the developer image to the transfer-receiving body, the developer remaining on the image bearing member is collected by the developing unit.

Abstract: A cartridge attachable to and detachable from an image forming apparatus forming an image on a recording material, the cartridge includes: an image bearing member; a developer container that contains therein a developer; a developing member that is rotatable and carries the developer supplied from the developer container and supplies the developer to the image bearing member; a developer supplying member that is rotatable and provided in the developer container and in contact with the developing member to supply the developer to a surface of the developing member; and a contact member provided in the developer container and in contact with a surface of the developer supplying member, wherein the developer remaining on the image bearing member after image formation is collected to the developing member, and the developer collected to the developing member is collected into the developer container.

Abstract: An image forming apparatus includes a photosensitive member; an exposure portion configured to expose the photosensitive member to light depending on image information to form a latent image on the photosensitive member; a developing portion configured to develop the latent image into a toner image with toner; and a transfer portion configured to transfer the toner image from the photosensitive member onto a recording material. The image forming apparatus changes a surface movement speed of the photosensitive member at timing prior to predetermined timing, when a moving speed of a recording material at the transfer portion changes, by a predetermined time.

Abstract: A mechanism that enables developer replenishment by a simpler structure and a mechanism that enables more user-friendly developer replenishment are provided. An attachment port to which a developer supply bottle containing a developer stored therein is detachably attachable is disposed in an interior of an image forming apparatus. The developer supply bottle can be attached when the cover is in an open state. According to this image forming apparatus, when the developer supply bottle is attached to the attachment port, the developer inside the developer supply bottle moves into a developer housing chamber by its own weight.

Abstract: A charging member which is driven so that the surface of the charging member has a speed difference from the surface of an image bearing member. In a cleaning operation for cleaning the charging member by transferring toner adhering to the surface of the charging member from the charging member to the image bearing member and collecting the transferred toner with a developing member, a first charging voltage forming a potential difference between the charging member and the image bearing member is applied to the charging member, and then a second charging voltage having the same polarity as that of the first charging voltage and an absolute value greater than that of the first charging voltage is applied. The potential difference is in a direction in which electrostatic force directed from the charging member to the image bearing member acts on the toner charged to normal polarity.

Abstract: An image forming apparatus includes a rotatable image bearing member to bear an electrostatic latent image, a developing container to accommodate developer including toner and to allow new developer to be replenished by a developer replenishing container, and a developer bearing member to develop the electrostatic latent image into a toner image by using the developer in the developing container. A transfer roller transfers the toner image born on the image bearing member onto the recording material, and a controller notifies replenishment information for prompting replenishing the developing container with the new developer by the developer replenishing container. The controller notifies the replenishment information in a state in which an index correlated with a ratio of an amount of paper dust mixed in the developer in the developing container to an amount of the developer in the developing container has not exceeded a preset threshold value of the index.

Abstract: An image forming method comprising a fixing step of fixing a toner image to a recording material while nipping and conveying the recording material, on which the toner image has been formed, by a fixing nip portion, wherein the toner comprises a toner particle comprising a toner base particle and an organosilicon polymer on a surface thereof, the organosilicon polymer has a structure represented by R—SiO3/2, where R is an C1 to C6 alkyl group or a phenyl group, the organosilicon polymer has convex portions formed on an outer surface thereof, and the convex portions satisfy specific relationships, and a contact pressure ? (MPa) of the pressure member and the fixing film and a storage elastic modulus G (MPa) of the toner at a temperature of a surface of the fixing film when the recording material is nipped and conveyed by the fixing nip portion satisfy specific relationships.

Abstract: An image forming apparatus includes a first display portion configured to display a ratio of an amount of toner accommodated in the developer container to a maximum amount of toner that the developer container is capable of accommodating, and a controller configured to, in a case where a replenishment operation, in which toner is supplied from the replenishment container to the replenishment port, is performed when the second display portion is in the second state, switch the second display portion from the second state to the first state and perform a display processing of displaying, on the first display portion, the ratio corresponding to an amount of toner accommodated in the developer container after the replenishment operation.

Abstract: An image forming apparatus includes an apparatus body, a cartridge attachable to and detachable from the apparatus body, a replenishment restriction portion configured to switch between a restricting state in which toner replenishment through a replenishment port is restricted and an allowing state in which toner replenishment through the replenishment port is allowed, a toner remainder amount detection portion, and a controller configured to, when the replenishment container is attached to the replenishment port, maintain the replenishment restriction portion in the restricting state in a case where a second printable sheet number is larger than a first printable sheet number, the first printable sheet number being obtained from a lifetime of the cartridge, the second printable sheet number being obtained from a sum of the amount of toner accommodated in the developer container and an amount of toner accommodated in the replenishment container.

Abstract: An image forming apparatus includes a photosensitive member, a transfer member, a transfer power source, and a control unit. At a start time of a start-up operation at the time of starting an image forming operation, on the surface of the photosensitive member, a first position coincides with a charging position, and a third position coincides with a transfer position. During a period in which an area on the photosensitive member located between the first position and the third position in a rotation direction of the photosensitive member passes the transfer position, the control unit performs control of applying a first voltage having the same polarity as a normal charging polarity of toner to the transfer member by the transfer power source, and, at a predetermined timing, changing a voltage from the first voltage to a second voltage having an absolute value less than that of the first voltage.

Abstract: A fixing device includes a heating rotating member having a conductive layer and an exposed portion in which the conductive layer is partially exposed, and a roller including a metal core and an elastic portion, the roller forming a nip portion with the heating rotating member, the elastic portion being elastically deformed in a region where the nip portion is formed, wherein an annular conductive member provided in a longitudinal end portion of the metal core is in contact with the exposed portion of the heating rotating member while elastically deformed, and wherein in a state where the roller is not mounted to the fixing device, an outer diameter of the conductive member is smaller than an outer diameter of the elastic portion.

Abstract: A fixing device includes a heating rotating member having a conductive layer and an exposed portion in which the conductive layer is partially exposed, and a roller including a metal core and an elastic portion, the roller forming a nip portion with the heating rotating member, the elastic portion being elastically deformed in a region where the nip portion is formed, wherein an annular conductive member provided in a longitudinal end portion of the metal core is in contact with the exposed portion of the heating rotating member while elastically deformed, and wherein in a state where the roller is not mounted to the fixing device, an outer diameter of the conductive member is smaller than an outer diameter of the elastic portion.

Abstract: An image forming apparatus includes a notification portion configured to notify replenishment information for prompting replenishing a developing container with developer in a case where an index is equal to or larger than a preset threshold value. The index is set such that the index increases in accordance with rotation of the developer bearing member and decreases in accordance with replenishment of the developing container with the developer. An amount of increase of the index per predetermined amount of rotation of the developer bearing member is larger in a case where an amount of the developer in the developing container is smaller. An amount of decrease of the index according to the replenishment of the developing container with the developer is larger in a case where an amount of replenished developer is larger.

Abstract: An image forming apparatus includes a rotatable image bearing member configured to bear an electrostatic latent image, a developing container configured to accommodate developer comprising toner, a developing member configured to develop the electrostatic latent image born on the image bearing member into a toner image by using the developer in the developing container, a transfer member configured to transfer the toner image born on the image bearing member onto the recording material, and a notification portion configured to notify replenishment information for prompting replenishing the developing container with the developer. The notification portion is configured to notify the replenishment information in a state in which an index correlated with a ratio of an amount of paper dust mixed in the developer in the developing container to an amount of the developer in the developing container has not exceeded a preset threshold value of the index.

Abstract: An image forming apparatus includes a notification portion configured to notify replenishment information for prompting replenishing a developing container with developer in a case where an index is equal to or larger than a preset threshold value. The index is set such that the index increases in accordance with rotation of the developer bearing member and decreases in accordance with replenishment of the developing container with the developer. An amount of increase of the index per predetermined amount of rotation of the developer bearing member is larger in a case where an amount of the developer in the developing container is smaller. An amount of decrease of the index according to the replenishment of the developing container with the developer is larger in a case where an amount of replenished developer is larger.

Abstract: A charging member which is driven so that the surface of the charging member has a speed difference from the surface of an image bearing member. In a cleaning operation for cleaning the charging member by transferring toner adhering to the surface of the charging member from the charging member to the image bearing member and collecting the transferred toner with a developing member, a first charging voltage forming a potential difference between the charging member and the image bearing member is applied to the charging member, and then a second charging voltage having the same polarity as that of the first charging voltage and an absolute value greater than that of the first charging voltage is applied. The potential difference is in a direction in which electrostatic force directed from the charging member to the image bearing member acts on the toner charged to normal polarity.