An image forming apparatus can inhibit an occurrence of downtime or shorten the downtime even in a case in which a mode for performing image formation and a position of, for example, a primary transfer member does not match. The image forming apparatus includes photosensitive drums each configured to bear a toner image, primary transfer members, an intermediate transfer belt, an abutment/separation mechanism configured to move the primary transfer members, and a controller. The controller brings the primary transfer members into contact with the photosensitive drums in a full-color mode, separates the primary transfer members from the photosensitive drums in a monochrome mode, and sets the position of the primary transfer members to a predetermined position between that in the full-color mode and the monochrome mode in a standby mode.

A deviation detection device to detect a deviation of a rotator includes a contact member disposed in contact with the rotator and configured to move, following a deviation of the rotator in a width direction of the rotator. The deviation detection device further includes a deviation detector configured to detect a direction of the deviation and a deviation amount of the rotator based on a displacement of the contact member, and a wear detector configured to detect a state in which an amount of wear of the contact member has reached a threshold.

There is provided an image forming apparatus that includes a color image former that forms a color image with a plurality of process color toners, a spot color image former that forms a spot color image with a spot color toner, a transfer unit that transfers the formed color image and the formed spot color image onto a recording material, a fixing unit that fixes the transferred color image and the transferred spot color image onto the recording material, and a hardware processor that selects a first mode or a second mode depending on whether or not a type of the recording material and an amount of toner to be attached onto the recording material satisfy a predetermined condition. The number of times of image transfer and fixation onto an identical surface of the recording material is two or more predetermined times in the first mode. The number of times of image transfer and fixation onto an identical surface of the recording material is less than the predetermined times in the second mode. When images are formed on both surfaces of the recording material, the predetermined condition differs between a first surface and a second surface of the recording material.

The present invention performs inplane uneven density correction that suppresses a number of tone correction properties and has few correction residuals. Accordingly, a holding unit of an apparatus of the present invention holds a plurality of tone correction properties respectively corresponding to a plurality of spot diameters that divide a range of a spot diameter of a light exposed on a surface of a photoreceptor by a predetermined interval. In addition a setting unit sets a tone correction property selected from the plurality of tone correction properties based on a spot diameter on the photoreceptor for a pixel corresponding to pixel data C. A correction unit corrects the pixel data C based on the set tone correction property, to generate tone correction data Cc.

Provided is an image forming apparatus and a control program. A fixer includes a first roller which includes an elastic layer having a predetermined thickness in a surface, a second roller which includes an elastic layer having a thickness smaller than that of the first roller in a surface, a fixing belt which is laid across the first roller and forms a fixing nip portion between the second roller and the fixing belt, and first and second drive motors that drive the first and second rollers, respectively. A hardware processor controls a drive current of the first drive motor so that an electromotive current generated in the second drive motor has a predetermined value in a case where the first roller is rotatively driven by the first drive motor and the second roller is caused to rotate as a follower of the first roller and the fixing belt.

A housing includes at least one openable cover and at least one adjacent cover. The at least one openable cover swings on a hinge to separate an interior of the housing from an exterior of the housing. The at least one openable cover has a first side edge on a side of the hinge. The at least one adjacent cover is adjacent to the at least one openable cover. The at least one adjacent cover has a second side edge neighboring the first side edge of the at least one openable cover across a gap. One of the at least one openable cover and the at least one adjacent cover includes at least one projection projecting into the gap and another one of the at least one openable cover and the at least one adjacent cover includes a recess that accommodates the at least one projection in the gap.

Provided is an image forming apparatus and a control program. A fixer includes a first roller which includes an elastic layer having a predetermined thickness in a surface, a second roller which includes an elastic layer having a thickness smaller than that of the first roller in a surface, a fixing belt which is laid across the first roller and forms a fixing nip portion between the second roller and the fixing belt, and first and second drive motors that drive the first and second rollers, respectively. A hardware processor controls a drive current of the first drive motor so that an electromotive current generated in the second drive motor has a predetermined value in a case where the first roller is rotatively driven by the first drive motor and the second roller is caused to rotate as a follower of the first roller and the fixing belt.

An image forming apparatus includes a nip forming member and a transfer bias output device that outputs a transfer bias to form a transfer electric field in a transfer nip between the nip forming member and an intermediate transfer member. Upon transfer of a composite toner image including a particular toner image onto a recording medium in the transfer nip, the transfer bias output device outputs the transfer bias including a first superimposed bias in which a direct current (DC) component is superimposed on an alternating current (AC) component. Upon transfer of the composite toner image without the particular toner image onto the recording medium in the transfer nip, the transfer bias output device outputs one of the transfer bias including a second superimposed bias having a peak-to-peak value of the AC component smaller than that of the first superimposed bias and the transfer bias including only the DC component.

A current detecting device includes: a drive signal generating unit configured to generate a control signal based on a control voltage value indicating drive force to be applied to a target; a current detecting unit configured to detect a current value output based on the control signal generated by the drive signal generating unit; and a correction unit configured to correct the current value detected by the current detecting unit, based on at least a magnitude of the control voltage value.

An endless belt includes a resin and conductive particles, in which a content of the conductive particles with respect to the endless belt is 5% by volume or more and 20% by volume or less in terms of a volume ratio, a Young's modulus of the endless belt is 3,000 MPa or more, and the number of times of bending endurance of the endless belt measured by an MIT test specified in JIS P8115:2001 is 10,000 or more.