A controller is configured to execute a larger gamut technology mode in which the controller performs image formation by controlling a ratio of a rotation speed of a development roller to a rotation speed of a photosensitive drum such that the ratio becomes a second speed ratio higher than a first speed ratio in a normal mode. The controller is configured to, when the controller executes the larger gamut technology mode, control transfer voltage based on a humidity around an image forming apparatus.

An image forming apparatus superimposes a plurality of color images each formed of a single-color developer to form a superimposed color image. The image forming apparatus includes a transfer belt and processing circuitry. The processing circuitry forms, as a correction pattern, combination patterns arranged along a conveyance direction of the color images and including a first pattern, a second pattern, and a third pattern. A formation interval of the first pattern constituting one combination pattern is shorter than a formation interval between one horizontal line of the first pattern constituting the one combination pattern and another horizontal line of the first pattern constituting another combination pattern. The one horizontal line is opposite the other horizontal line.

A feeding portion includes a pickup member and a feeding member. A first sheet sensor that is arranged on an upstream side in a sheet conveyance direction with respect to a conveying member, detects a sheet conveyed along a conveyance path. A second sheet sensor detects the sheet at a position between the pickup member and the feeding member. A control portion causes the feeding portion to start feeding of a subsequent sheet when the subsequent sheet is detected by the second sheet sensor at a first timing after detection of a preceding sheet by the first sheet sensor. Furthermore, the control portion causes the feeding portion to start feeding of the subsequent sheet at a second timing later than the first timing, when the subsequent sheet is detected by the second sheet sensor at the first timing.

An image forming apparatus that has a transfer device that includes an intermediate transfer belt that is tensioned by a plurality of support rollers, a secondary transfer roller that faces one of the support rollers via the intermediate transfer belt, a cam that adjust a pressing force that presses the intermediate transfer belt by the secondary transfer roller, a motor that drives the cam, and a conveyor that conveys a recording medium to a transfer nip formed between the intermediate transfer belt and the secondary transfer roller is provided with a controller that controls an operation of the motor. The controller executes first control of operating the motor with a constant torque and stopping the motor when a rotation angular speed of the motor is less than or equal to a first threshold and second control of operating the motor at a predetermined timing to adjust a transfer nip amount.

An image forming apparatus includes a density sensing portion, a cleaning portion, and a control portion. The density sensing portion includes a substrate and a sensor package and outputs a sensing value related to a toner density of a toner image formed on an outer circumferential surface of an image carrier. The control portion performs control so that, when the cleaning portion performs cleaning of a sensing surface, a brush is moved to a cleaning position where the brush contacts the sensing surface. The control portion also performs control so that, when the cleaning portion does not perform the cleaning of the sensing surface, the brush is moved to a retracted position where the brush does not contact the sensor package and the substrate.

An image forming apparatus includes an apparatus body having a body frame, an image bearing member, a belt unit including a belt, and a stretching member configured to stretch the belt, the belt unit being pivotable around a first pivot axis between a first position and a second position, a transfer unit, and a detection unit movably supported by the body frame. The detection unit is configured to pivot around a second pivot axis different from the first pivot axis with respect to the body frame so as not to hinder pivoting of the belt unit in conjunction with a pivoting operation in which the belt unit pivots from the first position to the second position.

An image forming apparatus includes a fixing portion and an optical sensor having first and second positioning holes and a connector. The fixing portion includes first and second screw holes, a through-hole, and an extension portion. If the optical sensor is placed on the fixing portion in a first orientation where the first positioning hole is aligned with the first screw hole and the second positioning hole is aligned with the second screw hole, the connector is inserted into the through-hole without interfering with the extension portion so that screws fix the optical sensor. If the optical sensor is placed on the fixing portion in a second orientation where the first positioning hole is aligned with the second screw hole and the second positioning hole is aligned with the first screw hole, the connector interferes with the extension portion so that the connector is not inserted into the through-hole.

According to one embodiment, an image forming apparatus includes an image forming unit, a sensor, and a control unit. The image forming unit forms a pattern constituted by a plurality of straight lines intersecting each other on a sheet or a transfer belt. The sensor detects the pattern formed on the sheet or the transfer belt. The control unit adjusts a writing position in a main scanning direction on the basis of the pattern detected by the sensor.

According to an embodiment, an image forming apparatus includes: a motor that drives a fixing device; and a controller. The motor outputs a signal corresponding to a driving current value of the motor. The controller performs a first operation where a magnitude value of the signal has fallen out of a first range while driving the motor in a first operation mode. The controller performs a second operation where the magnitude value of the signal has fallen out of a second range while driving the motor in a second operation mode.

An image forming apparatus includes an image forming device, a first transfer device including a first mover, a second transfer device including a second mover, a transfer-pressure changer, a detector, and circuitry. The detector detects a toner image and outputs a detection value indicating an amount of toner of the toner image adhering to the second mover. The circuitry calculates a variable value for the amount of toner varying with a change in a transfer pressure, based on the detection value and a target value of the amount of toner of the toner image to be transferred and adhere to the second mover, reflects the calculated variable value in the detection value to correct the detection value, adjusts an image-forming condition based on the corrected detection value, and sets the image-forming condition of the toner image in the image forming device based on the corrected detection value.