A sheet conveyance device includes a sheet placing portion, a guide member, a signal obtaining portion, and a notification portion. On the sheet placing portion, a sheet to be conveyed is placed. The guide member is disposed on the sheet placing portion so as to move in a width direction vertical to a sheet conveyance direction, and restricts, in the width direction, a position of the sheet on the sheet placing portion. The signal obtaining portion obtains an electric signal with a value corresponding to a position of the guide member. The notification portion, when a difference between the value and any of thresholds that are set in advance based on each sheet size in the width direction for determination of the size of the sheet, is equal to or smaller than a predetermined reference value, notifies that the sheet is separated from the guide member.

An image reading apparatus includes an apparatus body, a document sheet cover, a magnetic force generating portion, and a magnetic force control portion. The apparatus body has a document placement surface. The document sheet cover is supported by the apparatus body so as to be pivotable between an open position where the document placement surface is uncovered and a closed position where the document placement surface is covered with the document sheet cover. The magnetic force generating portion is able to selectively generate a magnetic attraction force and a magnetic repulsion force between a pair of a permanent magnet and an electromagnet provided in the cover portion and the apparatus body, respectively. The magnetic force control portion switches the magnetic force generating portion between a state where the magnetic force generating portion generates the attraction force and a state where the magnetic force generating portion generates the repulsion force.

A sheet size determining portion determines, upon start of execution of a print job, whether or not a sheet size corresponding to raster image data to be printed in the print job matches a sheet size of a sheet conveyed in the print job. A size error detecting portion determines, in a case where the sheet size corresponding to the raster image data does not match the sheet size of the sheet, whether or not a print pixel to be printed exists in an excess region of the raster image data that is outside the sheet size of the sheet. A printing portion continues execution of the print job in a case where no print pixel exists in the excess region and stops the print job in a case where the print pixel exists in the excess region.

The usability in a case where a combined image, which is obtained by integrating two scanned images of a specific original, is generated is improved. An image formation apparatus includes: a setting unit configured to set a layout method applied in a case where a combined image, which is obtained by integrating two scanned images corresponding to two original surfaces obtained by scanning a specific original, is generated; a detection unit configured to detect a position of the specific original placed on a platen glass for the scanning; and a notification unit configured to notify of a warning message in a case where the position of the specific original detected by the detection unit is different from a position of the specific original according to the layout method set by the setting unit.

A sheet identification device includes a light irradiation portion. When forming an identification image, the light irradiation portion projects first pattern light (P11) and second pattern light (P12) having different dependences on a fiber direction of a surface of a sheet on an identification region (R1). The identification image is an image of the identification region (R1) of the surface of the sheet on which image formation or image reading is performed, which is used for identifying the fiber direction of the surface of the sheet.

A first conveying mechanism conveys a sheet. A correction member is provided more on an upstream side of a conveying direction of the sheet than the first conveying mechanism, and includes a contact surface that comes into contact with a side end of the sheet at one end of a conveying path of the sheet in a width direction. A first orientation adjustment mechanism is operated by being input with a drive signal and changes an angle of the contact surface. A second conveying mechanism is provided more on the upstream side of the conveying direction than the correction member, and conveys the sheet toward the contact surface along a direction oblique with respect to the conveying direction. A support member supports the correction member and the first orientation adjustment mechanism. A second orientation adjustment mechanism is capable of changing an orientation of the support member by being operated manually.

A document conveyance apparatus includes a document tray, a separation feeding unit configured to form a separation nip for separating the documents one by one and to feed a document, a detection sensor configured to detect the document, a controller configured to stop feeding of the document based on the detection sensor, an environment sensor configured to acquire environment information, and a display. When the controller stops feeding of the document, (a) in a case where the environment information acquired by the environment sensor satisfies a predetermined condition, the display displays a screen for prompting a user to loosen a bundle of documents, and (b) in a case where the environment information acquired by the environment sensor does not satisfy the predetermined condition, the display does not display the screen for prompting the user to loosen the bundle of documents.