Abstract: Provided is an image forming apparatus including an image carrier, an exposure device, a developing device that supplies a developer to form a toner image, and a hardware processor that controls the image carrier, the exposure device, and the developing device. The image forming apparatus further includes a fume prevention plate that covers a part of an internal space of the developing device where the developing roller is disposed and the developer is stored and that prevents the developer from scattering outside from the internal space, a suction duct, and an air suction device. One end of the suction duct is connected to the internal space and another end of the suction duct is connected to the air suction device. The fume prevention plate includes a movable portion. A position of the movable portion can be changed between a first position and a second position different from the first position.

Abstract: An evaluation device evaluates an image clarity of a print image. The evaluation device includes: an object that is projected onto a measurement surface of a recording medium; an illuminator that makes the object projected onto the measurement surface; an imager that images the measurement surface on which the object has been projected to obtain image data; and a hardware processor that, based on a distribution of parameters related to a brightness of the image data, quantifies a degree of the image clarity into a numerical value and defines the numerical value as an evaluation value of the image clarity.

Abstract: Provided is an image forming apparatus including: a transfer member; a first image carrier on which a first toner image using toner of a first color is formed; a second image carrier which is provided on a downstream side relative to the first image carrier in a moving direction (rotating direction) of the transfer member, and on which a second toner image using toner of a second color is formed; a lubricant supply section that supplies a lubricant to the second image carrier; and a control section that controls a supply amount of the lubricant to the second image carrier in accordance with an overlap amount between the first toner image and the second toner image which are transferred from the first image carrier and the second image carrier to the transfer member.

Abstract: Provided is an image forming apparatus including: a transfer member; a first image carrier on which a first toner image using toner of a first color is formed; a second image carrier which is provided on a downstream side relative to the first image carrier in a moving direction (rotating direction) of the transfer member, and on which a second toner image using toner of a second color is formed; a lubricant supply section that supplies a lubricant to the second image carrier; and a control section that controls a supply amount of the lubricant to the second image carrier in accordance with an overlap amount between the first toner image and the second toner image which are transferred from the first image carrier and the second image carrier to the transfer member.

Abstract: Provided is an image forming apparatus including an image carrier, an exposure device, a developing device that supplies a developer to form a toner image, and a hardware processor that controls the image carrier, the exposure device, and the developing device. The image forming apparatus further includes a fume prevention plate that covers a part of an internal space of the developing device where the developing roller is disposed and the developer is stored and that prevents the developer from scattering outside from the internal space, a suction duct, and an air suction device. One end of the suction duct is connected to the internal space and another end of the suction duct is connected to the air suction device. The fume prevention plate includes a movable portion. A position of the movable portion can be changed between a first position and a second position different from the first position.

Abstract: An evaluation device evaluates an image clarity of a print image. The evaluation device includes: an object that is projected onto a measurement surface of a recording medium; an illuminator that makes the object projected onto the measurement surface; an imager that images the measurement surface on which the object has been projected to obtain image data; and a hardware processor that, based on a distribution of parameters related to a brightness of the image data, quantifies a degree of the image clarity into a numerical value and defines the numerical value as an evaluation value of the image clarity.

Abstract: An image forming apparatus includes a cleaning member formed by an elastic body, and a member to be cleaned in which toner added with an external additive adheres to a surface, and the toner is to be cleaned by the cleaning member being in contact with the surface, wherein the cleaning member has a protrusion disposed on a cleaning surface extending from a contact part with the member to be cleaned, and facing a side where the toner is to be cleaned, of the member to be cleaned.

Abstract: An image forming apparatus including: an image carrier that carries a toner image; a cleaner that contacts a surface of the image carrier and removes a toner, the cleaner being located at a first position during stop of rotation of the image carrier and located at a second position during rotation of the image carrier; a moving mechanism that moves the cleaner between the first position and the second position by moving the cleaner in a direction parallel to a rotation shaft of the image carrier while maintaining a contact state between the cleaner and the image carrier; and a hardware processor, in which the hardware processor starts to move the cleaner from the first position to the second position with the moving mechanism during stop of the rotation of the image carrier, and the hardware processor starts to rotate the image carrier during movement of the cleaner.

Abstract: A developing device for forming an image by developing an electrostatic latent image formed on an image carrier with a developer, includes: a developing container that accommodates the developer; a developing roller that faces the image carrier, is disposed adjacent to the developing container, and conveys the developer accommodated in the developing container to the image carrier, and a developer discharging part that is provided in the developing container and discharges a part of the developer, wherein a discharge amount of the developer discharged by the developer discharging part is controlled on the basis of a charge amount of a toner included in the developer.

Abstract: An image forming apparatus includes a cleaning member formed by an elastic body, and a member to be cleaned in which toner added with an external additive adheres to a surface, and the toner is to be cleaned by the cleaning member being in contact with the surface, wherein the cleaning member has a protrusion disposed on a cleaning surface extending from a contact part with the member to be cleaned, and facing a side where the toner is to be cleaned, of the member to be cleaned.

Abstract: An image forming apparatus includes: an image carrier that carries a toner image; a developing part that accommodates two-component developer containing toner and a carrier, and supplies the toner to the image carrier; a transferor that transfers the toner image on the image carrier onto paper; a cleaning member that removes the toner remaining on the image carrier; and a hardware processor that controls toner discharge operation in the developing part according to a toner discharge condition, in which the hardware processor sets the toner discharge condition so that a replacement time of the cleaning member overlaps with a replacement time of another consumable.

Abstract: An image forming apparatus includes: an image carrier that carries a toner image; a developing part that accommodates two-component developer containing toner and a carrier, and supplies the toner to the image carrier; a transferor that transfers the toner image on the image carrier onto paper; a cleaning member that removes the toner remaining on the image carrier; and a hardware processor that controls toner discharge operation in the developing part according to a toner discharge condition, in which the hardware processor sets the toner discharge condition so that a replacement time of the cleaning member overlaps with a replacement time of another consumable.

Abstract: A developing device includes: a developing roller that carries a developer; a developing tank that supplies the developing roller with the developer replenished from a replenishing port; a discharger that has a discharge port connecting to the developing tank and discharges the developer from the developing tank; a supply amount acquirer that acquires a supply amount of the developer to be supplied to the developing tank; a discharge amount acquirer that acquires a discharge amount of the developer to be discharged through the discharge port; a developer amount adjuster that adjusts an amount of the developer in the developing tank; and a hardware processor that controls the developer amount adjuster to adjust the amount of the developer in the developing tank to a value within a predetermined range, in accordance with the acquired supply amount and the acquired discharge amount of the developer.

Abstract: A developing device for forming an image by developing an electrostatic latent image formed on an image carrier with a developer, includes: a developing container that accommodates the developer, a developing roller that faces the image carrier, is disposed adjacent to the developing container, and conveys the developer accommodated in the developing container to the image carrier, and a developer discharging part that is provided in the developing container and discharges a part of the developer, wherein a discharge amount of the developer discharged by the developer discharging part is controlled on the basis of a charge amount of a toner included in the developer.

Abstract: A developing device includes: a developing roller that carries a developer; a developing tank that supplies the developing roller with the developer replenished from a replenishing port; a discharger that has a discharge port connecting to the developing tank and discharges the developer from the developing tank; a supply amount acquirer that acquires a supply amount of the developer to be supplied to the developing tank; a discharge amount acquirer that acquires a discharge amount of the developer to be discharged through the discharge port; a developer amount adjuster that adjusts an amount of the developer in the developing tank; and a hardware processor that controls the developer amount adjuster to adjust the amount of the developer in the developing tank to a value within a predetermined range, in accordance with the acquired supply amount and the acquired discharge amount of the developer.

Abstract: A image forming system of the present inventation includes a control section that causes a pattern image for image density control to be formed on an image carrier, and performs density correction control for correcting a density of a formed image on the basis of density information on the formed pattern image for image density control, wherein the control section determines a timing for performing the density correction control, on the basis of information corresponding to a density difference generated between images formed by the plurality of image forming apparatuses.

Abstract: Provided is an image formation system of series tandem type in which first and second image formation apparatuses connected in series execute an image formation process on a recording material, wherein the first image formation apparatus includes: a first image carrier; a first toner image formation unit; a first density detection unit; a first density control value setting unit; and a first temperature detection unit, the second image formation apparatus includes: a second image carrier; a second toner image formation unit; a second density detection unit; a second density control value setting unit; and a second temperature detection unit, and the image formation system includes: a recording material density detection unit; and a control unit.

Abstract: Provided is an image formation system of series tandem type in which first and second image formation apparatuses connected in series execute an image formation process on a recording material, wherein the first image formation apparatus includes: a first image carrier; a first toner image formation unit; a first density detection unit; a first density control value setting unit; and a first temperature detection unit, the second image formation apparatus includes: a second image carrier; a second toner image formation unit; a second density detection unit; a second density control value setting unit; and a second temperature detection unit, and the image formation system includes: a recording material density detection unit; and a control unit.

Abstract: A image forming system of the present inventation includes a control section that causes a pattern image for image density control to be formed on an image carrier, and performs density correction control for correcting a density of a formed image on the basis of density information on the formed pattern image for image density control, wherein the control section determines a timing for performing the density correction control, on the basis of information corresponding to a density difference generated between images formed by the plurality of image forming apparatuses.

Abstract: An image formation system includes: a first image forming apparatus; a sheet inversion section; a second image forming apparatus; an image density detection section configured to detect a density of a first pattern image for a highest density adjustment and a density of a second pattern image for a half-tone density adjustment, each of the first and second pattern images being formed on a sheet in each of the first image forming apparatus and the second image forming apparatus; and an inter-apparatus density adjusting section. The inter-apparatus density adjusting section corrects a density control point and a light exposure energy on a basis of detection results of the first and second pattern images of the image density detection section, respectively. The first and second density control sections correct the density control point or the light exposure energy in accordance with a coverage rate of an image.