An image reading device includes: light receiving sensors configured to read an image of a document conveyed in a sub-scanning direction and be arranged with an interval in a main scanning direction; one pair of document conveying rollers configured to be provided in front and back of the light receiving sensors in a document conveying direction; a detection unit configured to detect an image overlap amount in an image overlap area and/or an image missing amount in an image missing area; an adjustment amount determination unit configured to determine an adjustment amount for adjusting a distance between the document and the light receiving sensors based on the image overlap amount and/or image missing amount detected; and a drive unit configured to adjust a distance between the document and the light receiving sensors by displacing one of the document conveying rollers and light receiving sensors according to the adjustment amount.

An image forming apparatus includes: an image forming unit configured to form an image on a sheet based on a job, wherein the image forming unit being controlled based on an image forming condition; a conveying unit configured to convey the sheet in a conveyance path; an image reading unit configured to read a test image on the sheet conveyed by the conveying unit; and a controller configured to: control the image forming unit to form the image and the test image on a same sheet; control the reading unit to read the test image on the same sheet; and generate the image forming condition based on a reading result of the test image by the reading unit.

An image forming apparatus includes an image former to form an image on a sheet based on an image forming condition for adjusting a position of the image on the sheet, a heater to fix the image on the sheet, and an image reader to read the image on the sheet, the image reader being arranged downstream from the heater in a conveyance direction in which the sheet is conveyed. A processor controls the image former to form an image including a mark on a sheet, controls the image reader to read the mark, generates the image forming condition based on a reading result of the mark by the image reader, and controls to determine, in a case where a second image including the mark is formed by the image former after the first image including the mark is formed by the image former, whether to form a chart including the mark on the sheet before the second image is formed based on an elapsed time after forming the first image.

An image reading device includes: light receiving sensors configured to read an image of a document conveyed in a sub-scanning direction and be arranged with an interval in a main scanning direction; one pair of document conveying rollers configured to be provided in front and back of the light receiving sensors in a document conveying direction; a detection unit configured to detect an image overlap amount in an image overlap area and/or an image missing amount in an image missing area; an adjustment amount determination unit configured to determine an adjustment amount for adjusting a distance between the document and the light receiving sensors based on the image overlap amount and/or image missing amount detected; and a drive unit configured to adjust a distance between the document and the light receiving sensors by displacing one of the document conveying rollers and light receiving sensors according to the adjustment amount.

Temperature of a printing medium 110 is sufficiently decreased by stopping the printing medium 110 in a discharge path, conveying the printing medium at a low speed, switching a conveyance path, or the like. If the temperature of the printing medium 110 can be sufficiently decreased, the thermochromism phenomenon is suppressed. As a result, it is possible to provide an image forming apparatus capable of achieving highly accurate color matching and color stability.

Temperature of a printing medium 110 is sufficiently decreased by stopping the printing medium 110 in a discharge path, conveying the printing medium at a low speed, switching a conveyance path, or the like. If the temperature of the printing medium 110 can be sufficiently decreased, the thermochromism phenomenon is suppressed. As a result, it is possible to provide an image forming apparatus capable of achieving highly accurate color matching and color stability.

An image forming device having a printer unit, a post-processing unit, and an eject tray. The printer unit forms images on recording sheets, and the post-processing unit performs processing on a recoding sheet stack composed of one or more recording sheets output from the printer unit before the recording sheet stack is ejected onto the eject tray. The image forming device includes: a buffer unit that, while a first recording sheet resides in the post-processing unit for the post-processing, holds a second recording sheet therein, the second recording sheet output from the printer unit subsequent to the first recording sheet; and a reverse path that reverses recording sheets when the image forming device performs duplex printing. In a plan view of the image forming device taken along a vertical direction, the post-processing unit, the buffer unit, and the reverse path at least partially cover one another.

An image processing apparatus acquires a plurality of first images and one or a plurality of second images. The first images are acquired through a first reading operation in which a reading apparatus sequentially reads first sides of a plurality of document sheets. The second images are acquired through a second reading operation in which the reading apparatus reads second sides of one or more of the plurality of document sheets. In a case where the number of second images acquired is smaller than the number of first images acquired, the image processing apparatus determines a sequence of the plurality of first images and the one or the plurality of second images such that sequential numbers of the one or the plurality of second images are differently set depending on whether an interrupting factor has arisen.

Temperature of a printing medium 110 is sufficiently decreased by stopping the printing medium 110 in a discharge path, conveying the printing medium at a low speed, switching a conveyance path, or the like. If the temperature of the printing medium 110 can be sufficiently decreased, the thermochromism phenomenon is suppressed. As a result, it is possible to provide an image forming apparatus capable of achieving highly accurate color matching and color stability.