Abstract: An image forming operation forms an image on a transfer target in a state in which a developing member is located at a first position where a developer is supplied to an image bearing member and a first charging voltage is applied to a charging unit. The image forming operation is followed by: a first rotating operation of rotating the image bearing member in a state in which the developing member is located at the first position and a second charging voltage smaller in absolute value than the first charging voltage is applied; and a second rotating operation of rotating the image bearing member in a state in which the developing member is located at a second position where the developer is not supplied to the image bearing member and a third charging voltage smaller in absolute value than the second charging voltage is applied.

Abstract: An image forming apparatus includes an image forming portion including a developer storage portion, a fixing apparatus, a detection portion configured to output a detection signal in accordance with a developer amount in the developer storage portion, and a control portion configured to control a target temperature of the fixing apparatus. The control portion is configured to set the target temperature at a first temperature if the developer amount is a first amount, set the target temperature at a second temperature lower than the first temperature if the developer amount is a second amount smaller than the first amount, and set the target temperature at a third temperature higher than the second temperature if the developer storage portion is supplied with the developer such that the developer amount is increased from the second amount to the first amount.

Abstract: An image forming apparatus includes an image bearing member, a charging unit, a developing unit, a transfer unit, and a brush member arranged to be in contact with the image bearing member at a position downstream of a transfer portion and upstream of a charging portion in a direction of rotation of the image bearing member. The brush member includes a base body and a filament portion that is supported by the base body and that is configured to come into contact with the image bearing member. 50% or more of filaments of the filament portion are crimped yarn. The filaments of the crimped yarn are arranged in a dispersed manner over an entire range of the filament portion in the direction of rotation of the image bearing member.

Abstract: An additive coating is executed, where an additive is transferred, from a developing roller to a photosensitive drum by setting a surface potential of the drum to be lower than a developing voltage, and from the drum to a charging roller by setting a charging voltage to be lower than the surface potential. By setting a potential difference Vback between the surface potential and a developing voltage in a developing portion to be larger in the external additive coating than that in the image forming, a development amount of the additive is increased. Further, by setting a transfer voltage to be higher than the surface potential, transfer of the additive is suppressed. By setting the potential difference between the surface potential and the transfer voltage to be smaller than a discharge threshold between the transfer roller and the drum, the additive is suppressed from having a strong positive polarity.

Abstract: An image forming apparatus includes an image forming portion including a developer storage portion, a fixing apparatus, a detection portion configured to output a detection signal in accordance with a developer amount in the developer storage portion, and a control portion configured to control a target temperature of the fixing apparatus. The control portion is configured to set the target temperature at a first temperature if the developer amount is a first amount, set the target temperature at a second temperature lower than the first temperature if the developer amount is a second amount smaller than the first amount, and set the target temperature at a third temperature higher than the second temperature if the developer storage portion is supplied with the developer such that the developer amount is increased from the second amount to the first amount.

Abstract: An image forming apparatus includes a photosensitive drum, a charging member, a developing member, a transfer member, first and second gears, a drive source, and a control unit. The charging member contacts the photosensitive drum and forms a charging portion to charge a surface of the photosensitive drum. The control unit performs control in such a manner that an image forming operation of performing image formation by rotating the photosensitive drum at a first rotational speed is executable. Where the control unit executes the image forming operation, the control unit performs a switch operation of stopping the photosensitive drum in a state in which the photosensitive drum is driven, while a non-image forming operation to be executed after the image forming operation is executed, and rotationally driving the photosensitive drum again at a second rotational speed faster than the first rotational speed, a plurality of times.

Abstract: In an image forming apparatus, in which: a charging member charges an image bearing member; an exposure unit exposes a surface of the image bearing member to develop an electrostatic latent image; and a developer image on the image bearing member is transferred onto a recording material. A control portion is capable of executing a first operation mode for rotating the image bearing member at a first peripheral velocity, the first operation mode being a mode in which the exposure unit exposes the surface of the image bearing member with a first exposure intensity, and a second operation mode for rotating the image bearing member at a second peripheral velocity lower than the first peripheral velocity, the second operation mode being a mode in which the exposure unit exposes the surface of the image bearing member with a second exposure intensity higher than the first exposure intensity.

Abstract: An image forming apparatus includes a photosensitive member, a toner storage portion, a developing member configured to develop a latent image on the photosensitive member into a toner image, an attachment portion to which a replenishing container containing toner is attached, the attachment portion being configured to allow toner replenishment from the replenishing container into the toner storage portion, and a control unit configured to calculate a toner consumption amount by multiplying a count value correlated with the number of pixels constituting the toner image by a coefficient, the control unit being configured to change a value of the coefficient in a case where the toner replenishment is performed.

Abstract: In an image forming apparatus including a transfer member that primarily transfers a developer image from an image bearing member onto an intermediate transfer belt by applying an electric current to an intermediate transfer belt in a circumferential direction, a control unit which executes a first mode in which to rotate the intermediate transfer belt and a second mode in which to rotate the intermediate transfer belt at a rotation speed higher than that in the first mode. The control unit performs control such that an absolute value of a second voltage to be applied to the transfer member in a case of performing primary transfer in the second mode is less than an absolute value of a first voltage to be applied to the transfer member in a case of performing the primary transfer in the first mode.

Abstract: An image forming apparatus includes a rotatable image bearing member, a developing member to develop an electrostatic latent image at a developing portion, a transfer member to transfer a developer image to a recording member at a transfer portion; and a brush provided with a plurality of base materials contacting the image bearing member at downstream of the transfer portion and upstream of the developing portion in a rotational direction of the image bearing member. The developer remaining on the surface of the image bearing member is collected in the developing portion. An average distance between base materials of the brush with respect to a rotational axis direction of the image bearing member is larger than an average particle diameter of the developer, and is equal to or less than a length corresponding to a special frequency visually recognizable by a user when the image formed by the image forming apparatus is observed by the user.

Abstract: An image forming apparatus includes a photosensitive drum, a charging member, a developing member, a transfer member, first and second gears, a drive source, and a control unit. The charging member contacts the photosensitive drum and forms a charging portion to charge a surface of the photosensitive drum. The control unit performs control in such a manner that an image forming operation of performing image formation by rotating the photosensitive drum at a first rotational speed is executable. Where the control unit executes the image forming operation, the control unit performs a switch operation of stopping the photosensitive drum in a state in which the photosensitive drum is driven, while a non-image forming operation to be executed after the image forming operation is executed, and rotationally driving the photosensitive drum again at a second rotational speed faster than the first rotational speed, a plurality of times.

Abstract: In an image forming apparatus, in which: a charging member charges an image bearing member; an exposure unit exposes a surface of the image bearing member to develop an electrostatic latent image; and a developer image on the image bearing member is transferred onto a recording material. A control portion is capable of executing a first operation mode for rotating the image bearing member at a first peripheral velocity, the first operation mode being a mode in which the exposure unit exposes the surface of the image bearing member with a first exposure intensity, and a second operation mode for rotating the image bearing member at a second peripheral velocity lower than the first peripheral velocity, the second operation mode being a mode in which the exposure unit exposes the surface of the image bearing member with a second exposure intensity higher than the first exposure intensity.

Abstract: An additive coating is executed, where an additive is transferred, from a developing roller to a photosensitive drum by setting a surface potential of the drum to be lower than a developing voltage, and from the drum to a charging roller by setting a charging voltage to be lower than the surface potential. By setting a potential difference Vback between the surface potential and a developing voltage in a developing portion to be larger in the external additive coating than that in the image forming, a development amount of the additive is increased. Further, by setting a transfer voltage to be higher than the surface potential, transfer of the additive is suppressed. By setting the potential difference between the surface potential and the transfer voltage to be smaller than a discharge threshold between the transfer roller and the drum, the additive is suppressed from having a strong positive polarity.

Abstract: An image forming apparatus includes a photosensitive drum, a charging member, a developing member, a transfer member, first and second gears, a drive source, and a control unit. The charging member contacts the photosensitive drum and forms a charging portion to charge a surface of the photosensitive drum. The control unit performs control in such a manner that an image forming operation of performing image formation by rotating the photosensitive drum at a first rotational speed is executable. Where the control unit executes the image forming operation, the control unit performs a switch operation of stopping the photosensitive drum in a state in which the photosensitive drum is driven, while a non-image forming operation to be executed after the image forming operation is executed, and rotationally driving the photosensitive drum again at a second rotational speed faster than the first rotational speed, a plurality of times.

Abstract: An image forming apparatus includes (i) an apparatus main body including a discharge portion and a wall disposed on an opposite side to the discharge portion with respect to a horizontal direction, the discharge portion including a first opening, and the wall including a second opening, (ii) a photosensitive drum disposed below the first opening and the second opening, (iii) an exposed surface exposed toward a first communication path communicating with the first opening and the second opening and disposed below the first communication path. The image forming apparatus includes a receiving surface projecting from the exposed surface toward the first communication path. The receiving surface is upwardly oriented with respect to the vertical direction and faces the first communication path. The receiving surface is inclined relative to the vertical direction and the horizontal direction.

Abstract: An image forming apparatus includes an image bearing member, a charging unit, a developing unit, a transfer unit, and a brush member arranged to be in contact with the image bearing member at a position downstream of a transfer portion and upstream of a charging portion in a direction of rotation of the image bearing member. The brush member includes a base body and a filament portion that is supported by the base body and that is configured to come into contact with the image bearing member. 50% or more of filaments of the filament portion are crimped yarn. The filaments of the crimped yarn are arranged in a dispersed manner over an entire range of the filament portion in the direction of rotation of the image bearing member.

Abstract: An image forming apparatus includes an image forming portion including a developer storage portion, a fixing apparatus, a detection portion configured to output a detection signal in accordance with a developer amount in the developer storage portion, and a control portion configured to control a target temperature of the fixing apparatus. The control portion is configured to set the target temperature at a first temperature if the developer amount is a first amount, set the target temperature at a second temperature lower than the first temperature if the developer amount is a second amount smaller than the first amount, and set the target temperature at a third temperature higher than the second temperature if the developer storage portion is supplied with the developer such that the developer amount is increased from the second amount to the first amount.

Abstract: An image forming apparatus includes a rotatable image bearing member, a developing member to develop an electrostatic latent image at a developing portion, a transfer member to transfer a developer image to a recording member at a transfer portion; and a brush provided with a plurality of base materials contacting the image bearing member at downstream of the transfer portion and upstream of the developing portion in a rotational direction of the image bearing member. The developer remaining on the surface of the image bearing member is collected in the developing portion. An average distance between base materials of the brush with respect to a rotational axis direction of the image bearing member is larger than an average particle diameter of the developer, and is equal to or less than a length corresponding to a special frequency visually recognizable by a user when the image formed by the image forming apparatus is observed by the user.

Abstract: An image forming operation forms an image on a transfer target in a state in which a developing member is located at a first position where a developer is supplied to an image bearing member and a first charging voltage is applied to a charging unit. The image forming operation is followed by: a first rotating operation of rotating the image bearing member in a state in which the developing member is located at the first position and a second charging voltage smaller in absolute value than the first charging voltage is applied; and a second rotating operation of rotating the image bearing member in a state in which the developing member is located at a second position where the developer is not supplied to the image bearing member and a third charging voltage smaller in absolute value than the second charging voltage is applied.

Abstract: An image forming apparatus includes a rotatable image bearing member, a developing member to develop an electrostatic latent image at a developing portion, a transfer member to transfer a developer image to a recording member at a transfer portion; and a brush provided with a plurality of base materials contacting the image bearing member at downstream of the transfer portion and upstream of the developing portion in a rotational direction of the image bearing member. The developer remaining on the surface of the image bearing member is collected in the developing portion. An average distance between base materials of the brush with respect to a rotational axis direction of the image bearing member is larger than an average particle diameter of the developer, and is equal to or less than a length corresponding to a spatial frequency visually recognizable by a user when the image formed by the image forming apparatus is observed by the user.