An Oldham coupling having play in a rotational direction and being capable of transmitting a driving force. The Oldham coupling includes a developing drive gear as a first hub, a drive coupling as a second hub, and an intermediate member that transmits a driving force between the developing drive gear and the drive coupling. The developing drive gear includes a protruded portion that is fitted to a recessed portion of the intermediate member to transmit a driving force between the developing drive gear and the intermediate member. When seen in a rotational axis direction of the Oldham coupling, the shape of a protruded portion is a substantially rhombic shape.

In an image forming apparatus, upon receipt of a printing instruction, a controller starts rotation of a heating member, starts rotation of a photoconductor drum when a standby time has elapsed from a time of the start of the rotation of the heating member, starts conveyance of a sheet after the start of the rotation of the photoconductor drum, and forms a toner image on the sheet after the start of the conveyance of the sheet. The controller is configured to be operated in one of selectable modes including a multicolor mode in which a toner image is formed using both of toner of a first color and a second color and a monochrome mode in which a toner image is formed using toner of the second color only. The standby time adopted in the monochrome mode is longer than the standby time adopted in the multicolor mode.

An image forming apparatus includes: a belt to be transported; an image forming body that forms an image on the belt or a recording medium that is transported by the belt; a moving mechanism that moves the belt in a movement direction extending in a thickness direction of the belt; a rotational member including a rotation shaft extending in the movement direction and a contact portion that is rotatable around the rotation shaft and that is in contact with a side surface of the belt regardless of a position of the belt in the movement direction; an acquirer that acquires a physical amount that changes due to rotation of the contact portion around the rotation shaft when the belt moves in a width direction; and a detector that detects a movement amount of the belt in the width direction based on the physical amount acquired by the acquirer.

An image forming apparatus includes a developing container, a detection portion detecting an amount of toner in the developing container, a display portion, and a control portion controlling the detection portion to execute a first detection and a second detection, wherein the display portion, in a case where the detection result of the first detection is greater than or equal to a first threshold, displays a first display and, in a case where the detection result is less than the first threshold, displays a second display different from the first display, and in a case where the detection result of the second detection is greater than or equal to a second threshold smaller than the first threshold, displays the first display and, in a case where the detection result is less than the second threshold, displays the second display.

A recording material conveying device includes: a first conveyor that constitutes a conveyance path of a recording material; a second conveyor that branches from the first conveyor and constitutes a conveyance path of the recording material different from the conveyance path of the first conveyor; and a detector that detects recording material characteristics of the recording material, the detector being arranged in the second conveyor on a downstream side in a conveyance direction of the recording material with respect to a branch portion where the first conveyor and the second conveyor branch.

An image forming apparatus includes a change processing portion, a detection processing portion, a second acquisition processing portion, and an adjustment processing portion. The change processing portion changes a transfer current when a plurality of specific toner images which each include a toner layer of C formed on an image-carrying member and a toner layer of M are each transferred to a sheet. The detection processing portion detects a specific image that corresponds to each specific toner image included in the captured image of the sheet. The second acquisition processing portion acquires, for each of detected specific images, a skewness of a histogram of gradation values of a color mixture of M and Y in pixels included in each of the specific images. The adjustment processing portion adjusts the transfer current based on: the skewness acquired for each of the specific images; and the transfer current corresponding to the skewness.

An image forming device comprising circuitry. The circuitry generates an image pattern in which two or more types of patch images are combined and changes a value of image data around at least one type of patch image of the two or more types of patch images to less than a maximum value of image data of the at least one type of patch image when the two or more types of patch images are combined.

An image forming apparatus, temperature control method, and temperature control device are provided. The apparatus includes the device, which acquires a first temperature difference between a temperature estimation value of a fixer, which is obtained by simulating a member temperature of a temperature control target serving as a heat capacitor-resistor circuit at an initial stage of operation of the fixer, and a detected temperature detected by a temperature sensor, and acquires a second temperature difference between a temperature estimation value of the fixer, which is obtained during an operation after the first temperature difference is acquired, and a detected temperature. The device calculates a difference between the first temperature difference and the second temperature difference, determines that the detected temperature is abnormal in response to the difference being equal to or greater than a threshold value, and performs temperature control for correcting a target temperature of the member temperature.

An image forming apparatus includes a housing, a toner image forming portion, a foil transfer unit, a sheet tray, and a discharge portion. The toner image forming portion is provided in the housing and configured to form a toner image on a sheet. The foil transfer unit is configured to superpose a foil with a surface of the sheet. The sheet tray is installable in the housing in an inserting direction and configured to accommodate a sheet to be supplied to the toner image forming portion. The first discharge portion is configured to discharge the sheet from the foil transfer unit to the outside of the housing in a discharging direction opposite to the inserting direction. The second discharge portion is configured to discharge the sheet from the toner image forming portion to the outside of the housing without passing through the foil transfer unit in the discharge direction.

An information processing apparatus includes: a setting unit configured to set one or more colorimetric regions in an image to be formed based on image data; and a transmission unit configured to transmit a print job to an image forming apparatus, the print job including the image data and colorimetric region information indicating the one or more colorimetric regions. The setting unit has a first mode under which the setting unit selects, based on a selection criterion, a colorimetric region in the image to be formed based on the image data, and a second mode under which a user designates the colorimetric region.