Provided is an operation method of an image forming apparatus, the operation method including according to a color registration pattern that is a standard for determining an overlapping degree of respective color images of a plurality of colors to form a color image, transferring respective developers with the plurality of colors onto an intermediate transfer body; obtaining patch data of patches of the plurality of colors transferred according to the color registration pattern onto the intermediate transfer body. The patch data is compared with reference patch data corresponding to the color registration pattern, and based on a result of the comparing, noise data corresponding to noise is detected from the patch data. Standard patch data is obtained by removing the noise data from the patch data, and performing color registration based on the standard patch data.

An image forming apparatus that has an image bearing member to be removably mounted to the image forming apparatus includes an intermediate transfer member, a toner detection unit, an exposure device, a forming unit, and a judgment unit. The judgment unit judges a mounting state of the image bearing member based on whether the toner detection unit detects a toner image transferred on a surface of the intermediate transfer member. When the image bearing member is mounted, first and second patterns of toner images are formed apart by a predetermined interval in a rotation direction of the intermediate transfer member. Where the toner detection unit detects the first and second patterns of toner images, the judgment unit judges that the image bearing member is mounted. Where one of the first and second patterns is not detected, the judgment unit judges that the image bearing member is not mounted.

An image forming apparatus has a normal image formation mode and a wide color gamut image formation mode in which an amount of a developer per unit area of a developer image of at least a color that differs from a prescribed color among a plurality of colors is increased as compared to the normal image formation mode. Image data is generated such that an image portion formed in the prescribed color in an image formed on a recording material is formed solely by a developer image of the prescribed color in the normal image formation mode, but formed by superimposing a developer image of a color that differs from the prescribed color on a developer image of the prescribed color or formed solely by a developer image of a different color in place of a developer image of the prescribed color in the wide color gamut image formation mode.

The crystallinity of a thermoplastic resin is 8% or more and 25% or less, the average primary particle size of carbon black is 10 nm or more and 30 nm or less, the content of the carbon black is 15.0 parts by mass or more and 30.0 parts by mass or less with respect to 100 parts by mass of an intermediate transfer belt, and (Li+Lo+Lc)/3≤100 nm, where Li, Lo, and Lc are values of an L-function indicating a dispersibility of the carbon black with respect to the thermoplastic resin in an inner peripheral surface region of the intermediate transfer belt, in an outer peripheral surface region, and in a central region that is a central portion of the intermediate transfer belt in a thickness direction of the intermediate transfer belt, respectively.

In an image forming apparatus, a cleaning blade, disposed on a downstream side of a transfer roller in a rotation direction of an image carrier, removes toner remaining on the image carrier after transfer of a toner image to an intermediate transfer member. After completion of an image forming operation, a controller causes the transfer roller to separate from the intermediate transfer member, cause the developing device to form on the image carrier a toner band to be supplied to the cleaning blade, and cause rotation of the image carrier to stop such that at least a part of the toner band formed on the image carrier stops within a section from a first position facing the transfer roller to a second position facing the cleaning blade in the rotation direction.

An image forming device including a forming unit, an adhesion amount detector, a correction coefficient determiner, and a correction unit. The forming unit forms line images each having a different line width. The adhesion amount detector detects a toner adhesion amount for each of the line images. The correction coefficient determiner determines, according to the toner adhesion amounts detected for each line width, correction coefficients for a gradation value of the line images of each line width. The correction unit corrects a gradation value of a line image using a correction coefficient corresponding to the line width of the line image when forming the line image.

An imaging system includes an endless belt which includes a first surface and a second surface and a steering assembly which is tiltable to adjust a position of the endless belt. The steering assembly includes a first member that is adjacent to the first surface of the endless belt and a second member that is adjacent to the second surface of the endless belt, to press the endless belt against the first member.

An image forming apparatus includes: a gear that transmits a drive force, which is supplied from a drive unit, to a photosensitive drum; a formation processing unit that, at arrival of each of specific formation timings, uses the photosensitive drum thereby to form a to-be-detected toner image that is based on a to-be-detected image having a specific density; an acquisition processing unit that acquires a variation width of a density in the to-be-detected toner image formed by the formation processing unit; and a determination processing unit that determines a failure timing of the gear based on the variation width for each of the formation timings.

An image forming apparatus includes an image forming unit configured to form a toner image, an intermediate transfer belt configured to transfer the transferred toner image to a recording material at a secondary transfer position, a first cleaning unit arranged downstream of the secondary transfer position and upstream of the primary transfer position in a conveyance direction of the intermediate transfer belt and configured to clean the intermediate transfer belt, a second cleaning unit arranged downstream of the secondary transfer position and upstream of the first cleaning unit in the conveyance direction of the intermediate transfer belt and configured to clean the intermediate transfer belt, a conveyance unit provided opposite to the first and the second cleaning units at a position below the first and the second cleaning units and configured to convey the recording material, and a third space from which the first and the second spaces are accessible.

An image forming method includes forming an image by transferring and fixing white toner and color toner of at least one color to a recording medium, wherein when an endothermic peak top temperature and a toner softening point in a first temperature increasing process in differential scanning calorimetry of the white toner are Tmw (° C.) and Tspw (° C.), respectively, and an endothermic peak top temperature and a toner softening point in a first temperature increasing process in differential scanning calorimetry of the color toner are Tmc (° C.) and Tspc (° C.), respectively, Equations (1) and (2) below are satisfied:
[Math. 1]
3≤(Tmc−Tmw)≤20  (1)
Tspw>Tspc  (2)