An automatic document feeder, which is included in an image reading device and an image forming apparatus, includes first and second document trays, a document output tray, a document conveying passage, multiple document conveying bodies, a drive source, a detector, and a controller. The multiple document conveying bodies include a document holding and conveying body to convey and hold the original document sheet on the second document tray. On detection of the original document sheet on the second document tray while conveying a different original document sheet from the first document tray, the controller stops feeding the different original document sheet, causes the different original document sheet downstream from the document holding and conveying body in a document conveying direction to be conveyed to the document output tray, and stops the drive source after the different original document has been conveyed to the document output tray.

An image reading apparatus includes a line sensor configured to read an image of a target object. The line sensor includes light receiving element arrays arranged at given intervals in a second direction perpendicular to a first direction for a plurality of lines, the plurality of light receiving element arrays each including a first light receiving element configured to receive light of a first color and a second light receiving element configured to receive light of a second color different from the first color, which are arranged in the first direction to form one line. The image reading apparatus is configured to derive a shading correction coefficient for shading correction based on output from the light receiving element arrays that have read a reference white plate, and to identify, as an abnormal pixel, a pixel obtained by reading a foreign matter existing on the reference white plate.

Provided is an image reading apparatus including: a line sensor including three light receiving element arrays arranged at a predetermined interval in a sub-scanning direction, and being configured to read an image of an original by the respective light receiving element arrays to generate read data representing the read image, the three light receiving element arrays each including light receiving elements for receiving red light, blue light and green light. These elements are arranged in a main scanning direction; and a reading control board. The reading control board is configured to acquire the read data obtained by the respective light receiving element arrays from the line sensor, to sort a plurality of pieces of read data for every pixel of the same color, and to detect an abnormal pixel that does not exist in the image of the original for each color.

An image forming apparatus that forms an output image including an authentication image for authenticity determination on a medium. The image forming apparatus includes: a recording head configured to discharge a droplet onto the medium; a drive unit configured to perform main scanning in which the recording head moves in a main scanning direction and sub scanning in which the medium is fed in a feeding direction; and a control unit configured to control, based on image formation data representing the output image, the main scanning and the sub scanning performed by the drive unit, and the discharge of the droplet performed by the recording head. The control unit performs a control to form the authentication image by a plurality of times of the main scanning in which feeding positions of the medium in the feeding direction are different, and performs a control so that at least one feeding amount of the medium in one sub scanning is different between a feeding amount at time of forming the authentication image and a feeding amount at time of forming a portion of the output image that does not include the authentication image.

Provided is an image reading apparatus including a line sensor including three line sensors arranged at a predetermined interval in a sub-scanning direction, and being configured to read an image of an original by the respective line sensors, which includes light receiving elements arranged in a first direction, to generate read data representing the read image, the three line sensors each including a first light receiving element configured to receive red light, a second light receiving element configured to receive blue light, and a third light receiving element configured to receive green light, which are arranged in a main scanning direction; and a reading control board. The reading control board is configured to generate a first combined flag obtained by combining results of detecting abnormal images of respective colors and a second combined flag obtained by combining results of detecting abnormal images of the respective colors.

A multifunction apparatus includes a reading mechanism including a document discharge port configured to discharge a document, a recording mechanism including a medium discharge port configured to discharge a recording medium, and a control unit, and a path through which a leading end of the recording medium discharged from the medium discharge port passes and the document discharged from the document discharge port have such a positional relationship to intersect with each other at an intersecting position, and when the leading end of the recording medium is discharged from the medium discharge port in a stop state where the document discharged from the document discharge port blocks the path of the leading end of the recording medium discharged from the medium discharge port, the control unit performs a predetermined operation for canceling the stop state before causing the leading end of the recording medium to reach the intersecting position.

An image reading apparatus includes a feed roller configured to feed a document, a transport roller disposed downstream of the feed roller and configured to transport the document downstream; a transport motor being a drive source of the transport roller; a reading unit disposed downstream of the transport roller and configured to read the document; and a control unit configured to control the reading unit and the transport motor, wherein the control unit is configured to obtain information on a document type and an inclination detection reference value for an inclination of image data set in accordance with the document type and obtained from the reading unit, and when the inclination of the image data exceeds the inclination detection reference value in accordance with the document type, the control unit stops the transport motor.

It is possible to continue printing processing without suspension even in the case where print data is not prepared in time in continuous printing that is performed by continuously feeding sheets. An image forming apparatus includes: a generation unit configured to generate image data based on a print job; a determination unit configured to determine whether image data corresponding to a sheet passing a predetermined location of a conveyance path through which sheets are conveyed is prepared in time; and a control unit configured to perform, in the case where the determination unit determines that image data is not prepared in time, control to leave the sheet as a blank sheet by skipping processing to form an image for the sheet, and the control unit changes a printing order determined in advance in the case where the determination unit determines that image data is not prepared in time.

An image forming apparatus that includes a charger for charging a surface of a photoreceptor and that forms an image by using an electrophotographic system, the charger being configured to be cleanable, includes a guidance notification unit that causes a guidance notification prompting cleaning of the charger to be displayed and a guidance notification determination unit that, in accordance with a threshold set in accordance with usage condition of the image forming apparatus, determines whether or not to cause the guidance notification to be displayed.

A recording apparatus, comprising: an apparatus body; a recording device that is provided inside the apparatus body and performs recording on a medium; a supporting tray that is switchable between a drawn-out state and a housed state and, when in the drawn-out state, supports the medium that is to be fed toward the recording device, the drawn-out state being a state of being drawn out from the apparatus body, the housed state being a state of being housed in the apparatus body; and a unit that is detachably attached to the apparatus body and includes a reverse roller for reverse the medium, wherein the supporting tray has a portion that is configured to be on a path of attachment and detachment of the unit when in the housed state.