A reading device includes a conveyance control section for controlling document conveyance. In a case of double-sided reading of a document and with a cutout document mode applied, the conveyance control section stops a pair of reverse-rotation rollers at a time point when the document has been conveyed to a distance resulting from adding an additional distance, which is predetermined or determined based on a recognized cutout width in the document conveyance direction, to a reference distance since a time point of passage of a rear end of a document-detecting detection part, and thereafter start reverse rotation of the pair of reverse-rotation rollers.

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 reading device includes a tray, a paper feed roller that conveys a sheet, a first sensor that detects a front end and a rear end of the sheet, a second sensor that detects the front end of the sheet, and a scanner that reads an image on a front side of the sheet and reads an image on a back side of the sheet. A controller determines a first time duration that elapses from the detection of the front end of the sheet by the first sensor to the detection of the rear end of the sheet by the first sensor and operates the scanner to read the image on the back side of the sheet over a second time duration equal in length to the first time duration. The second time duration begins after the front end of the sheet is detected by the second sensor.

An image reading device includes a reading member and a skew detector. The reading member reads an image of a passing document at a read position preset in a document transport path. The skew detector detects a skew of the document by selecting one of a first skew detection mode and a second skew detection mode based on information that specifies a method for detecting the skew of the document. The first skew detection mode is a mode in which the skew of the document relative to a transport direction is detected based on an image of a leading-edge section, in the transport direction, read by the reading member. The second skew detection mode is a mode in which the skew of the document relative to the transport direction is detected based on an entire image read by the reading member.

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.

Image data is obtained by reading an image of a sheet by a reading unit, and a location of the sheet to which a predetermined image is to be attached is specified. The sheet that has been read is conveyed to a position of a printing unit, and the predetermined image is caused to be printed at the specified location of the sheet by the printing unit, and then the sheet on which the predetermined image has been printed is caused to be conveyed to a read position of the reading unit and read by the reading unit, and image data of the sheet is output.

An image forming apparatus includes an image forming device, a first conveyance mechanism, a second conveyance mechanism, a second conveyance mechanism, and circuitry. The image forming device forms an image on a recording medium. The first conveyance mechanism conveys the recording medium to the image forming device. The second conveyance mechanism conveys the recording medium having passed through the image forming device to the image forming device again. The circuitry controls multiple times of printing operations of the image forming device. The image forming device performs multiple times of printing on a same side of the recording medium. The multiple times of printing include first printing and second printing. The first printing is printing on the recording medium based on first print data. The second printing is printing on the recording medium subjected to the first printing based on second print data different from the first print data.