Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.

Abstract: Provided are a drive force transmission member and control unit. The drive force transmission member has multiple first engaging portions. Drive force is transmitted from the drive force transmission member to a drive force receiving member with each first engaging portion engaged with a second engaging portion of the drive force receiving member. The second engaging portions are movable in a radial direction centered on a rotation axis line of the drive force transmission member. The control unit performs rotation control of forward rotation of the drive force transmission member by ?° and thereafter backward rotation by ?° after a cartridge is mounted to an apparatus main body but before image formation. Each of the multiple first engaging portions is upstream in the forward rotation direction of the drive force transmission member from the second engaging portion out of the multiple second engaging portions with which engaging will be realized.

Abstract: The image forming apparatus includes a control unit that executes a supply operation to supply a toner charged with a regular charge polarity, to at least one abutting portion of a plurality of abutting portions, at the time of image non-formation, the plurality of abutting portions being formed by a plurality of cleaning members and a plurality of image bearing members, the control unit determining an image bearing member to which the most amount of the toner charged with the regular charge polarity is supplied, based on image formation information, the image formation information being information about an image formation executed before the supply operation is executed.

Abstract: A developer container includes a stirring member that stirs a developer and a conductive resin sheet that comes into contact with the stirring member when the stirring member rotates. Wherein, the developer container detects developer quantity using capacitance from the conductive resin sheet.

Abstract: Provided are a drive force transmission member and control unit. The drive force transmission member has multiple first engaging portions. Drive force is transmitted from the drive force transmission member to a drive force receiving member with each first engaging portion engaged with a second engaging portion of the drive force receiving member. The second engaging portions are movable in a radial direction centered on a rotation axis line of the drive force transmission member. The control unit performs rotation control of forward rotation of the drive force transmission member by ?° and thereafter backward rotation by ?° after a cartridge is mounted to an apparatus main body but before image formation. Each of the multiple first engaging portions is upstream in the forward rotation direction of the drive force transmission member from the second engaging portion out of the multiple second engaging portions with which engaging will be realized.

Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.

Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.

Abstract: This disclosure provides a developer container in which a conductive resin sheet is used as an electrode for detecting an amount of developer by using electrostatic capacitance. A configuration in which an end of the conductive resin sheet in a longitudinal direction is provided outside an end of a sheet member in a longitudinal direction, or a configuration in which the sheet member starts contact with the conductive resin sheet from a second surface on the downstream side in a direction or rotation than a first surface are also provided.

Abstract: The image forming apparatus includes a control unit that executes a supply operation to supply a toner charged with a regular charge polarity, to at least one abutting portion of a plurality of abutting portions, at the time of image non-formation, the plurality of abutting portions being formed by a plurality of cleaning members and a plurality of image bearing members, the control unit determining an image bearing member to which the most amount of the toner charged with the regular charge polarity is supplied, based on image formation information, the image formation information being information about an image formation executed before the supply operation is executed.

Abstract: An image forming apparatus is capable of performing a second image forming operation in which a peripheral velocity ratio of a developer bearing member to an image bearing member becomes greater than that in a first image forming operation, and in which a potential difference between a developing bias applied to the developer bearing member and a supply bias applied to a supply member becomes a potential difference at which a urging force causing a developer at the contact portion between the developer bearing member and the supply member to move from the supply member to the developer bearing member becomes smaller than that in the first image forming operation, or becomes a potential difference at which a urging force causing the developer to move from the developer bearing member to the supply member is generated.

Abstract: Provided is an image forming apparatus in which an electrostatic latent image is developed using developer to which externally added particles have been added. In the image forming apparatus, a cleaning operation in which the developer borne by an intermediate transfer member is transferred to an image bearing member and removed from the surface of the image bearing member with a cleaning member can be executed in a non-image-formation period in which the development of the electrostatic latent image is not performed. The image bearing member is in contact with a developer bearing member and the intermediate transfer member at least within a period in which the cleaning operation is executed within the non-image-formation period.

Abstract: The present disclosure relates a developer container for accommodating a developer. The developer container includes a conductive path. The conductive path includes a resin.

Abstract: Provided is an image forming apparatus in which an electrostatic latent image is developed using developer to which externally added particles have been added. In the image forming apparatus, a cleaning operation in which the developer born by an intermediate transfer member is transferred to an image bearing member and removed from the surface of the image bearing member with a cleaning member can be executed in a non-image-formation period in which the development of the electrostatic latent image is not performed. The image bearing member is in contact with a developer bearing member and the intermediate transfer member at least within a period in which the cleaning operation is executed within the non-image-formation period.

Abstract: A developer bearing member, which bears developer to which additive particles have been added, and an image bearing member, on which an electrostatic latent image formed on the surface thereof is developed by rubbing contact with the developer bearing member, are configured so as to be separable; and during a first operation in which the image bearing member, while in a separated state from the developer bearing member, makes rubbing contact with a cleaning member, a second operation is carried out to place the developer bearing member temporarily in contact with the image bearing member and supply the additive particles to the contact portion between the cleaning member and the image bearing member.

Abstract: A developer bearing member, which bears developer to which additive particles have been added, and an image bearing member, on which an electrostatic latent image formed on the surface thereof is developed by rubbing contact with the developer bearing member, are configured so as to be separable; and during a first operation in which the image bearing member, while in a separated state from the developer bearing member, makes rubbing contact with a cleaning member, a second operation is carried out to place the developer bearing member temporarily in contact with the image bearing member and supply the additive particles to the contact portion between the cleaning member and the image bearing member.

Abstract: An image forming apparatus performs first control, while rotating an image bearing member at a first speed during non-image-formation, to apply a plurality of alternating-current voltages differing in peak-to-peak voltage to a charging device and to detect the value of each alternating current flowing through the image bearing member. When rotating the image bearing member at a second speed during image formation, the image forming apparatus performs second control, while rotating the image bearing member at the second sped before the start of image formation, to apply an alternating-current voltage determined based on the first control to the charging device. In the second control, the image forming apparatus detects the value of the alternating current flowing through the image bearing member, and determines a peak-to-peak voltage of the alternating-current voltage applied to the charging device at the time of image formation based on the detected alternating current value.

Abstract: Provided is a technology that enhances the detection precision of the residual amount of a developer. An apparatus according to the invention includes: an accommodating portion in which a developer is accommodated; a sheet-like stirring member that, by rotating, stirs the developer accommodated in the accommodating portion; a piezoelectric element that is affixed to the stirring member and that outputs voltage when being deformed; and a deflection forming portion that comes in contact with the stirring member, thereby causing the stirring member to deflect, when a free end of the rotating stirring member is outside a developer accumulation region in the accommodating portion.

Abstract: The present disclosure relates a developer container for accommodating a developer. The developer container includes a conductive path. The conductive path includes a resin.

Abstract: This disclosure provides a developer container in which a conductive resin sheet is used as an electrode for detecting an amount of developer by using electrostatic capacitance. A configuration in which an end of the conductive resin sheet in a longitudinal direction is provided outside an end of a sheet member in a longitudinal direction, or a configuration in which the sheet member starts contact with the conductive resin sheet from a second surface on the downstream side in a direction or rotation than a first surface are also provided.

Abstract: A developer container includes a stirring member that stirs a developer and a conductive resin sheet that comes into contact with the stirring member when the stirring member rotates. The developer container detects developer quantity using capacitance.