An image forming apparatus includes a reconveying unit including a reconveying roller; and a second transmission mechanism. The second transmission mechanism transmits a drive force to the reconveying roller and includes an input gear; an output gear; an intermediate gear including first and second gears; and first and second swinging gears. The first toothless part of the first gear and the second toothless part of the second gear are provided at such a position that, when the intermediate gear is rotated by a drive force transmitted from the input gear through the second swinging gear while the second swinging gear meshes with the second toothed part of the second gear and the output gear meshes with the first toothed part of the first gear, the first toothless part reaches a position confronting the output gear and then the second toothless part reaches a position confronting the second swinging gear.

A printing apparatus receives and executes a mixed print job in which single-sided printing and double-sided printing are mixed and includes a feeding unit that accumulates and feeds a plurality of sheets, a printer unit that prints an image on a sheet, a double-sided conveyance path that includes a refeeding unit to refeed a sheet in which an image has been printed on a first side of the sheet and to feed the sheet in order to print an image on a second side of the sheet. The printing apparatus executes double-sided print processing in a case where a print job in which a page corresponding to a sheet for which double-sided printing is instructed is included but a page corresponding to a sheet for which single-sided printing is instructed is not included.

An image forming apparatus includes a first outlet portion that allows sheet to be discharged therethrough toward a side surface of the apparatus, a holding portion that holds sheets that are to be reversed, a second outlet portion that is disposed at an upper portion of the apparatus and that allows sheets to be discharged therethrough toward an upper side of the apparatus, a first switching member that changes a destination of a sheet transported thereto between the holding portion and the first outlet portion, and a second switching member that changes a destination of a sheet transported thereto between the second outlet portion and the holding portion or the first outlet portion to which the first switching member has changed the destination.

The curl correction device includes a first guide that guides a sheet to a nip portion between a first rotation member and a second rotation member, a support portion that rotatably supports the first guide about a fulcrum on the downstream side of the first guide, and a restriction portion that restricts a rotation of the first guide rotating about the fulcrum by being in contact with the first guide. The first guide is rotatable about the fulcrum so as to become separated from the restriction portion.

This image forming apparatus is equipped with: a conveyance cover which forms a reverse conveyance path; and a double-sided conveyance unit. The conveyance cover is turnably mounted to a body housing, and the double-sided conveyance unit is turnably mounted to the conveyance cover. A side surface of the body housing is equipped with a first abutment surface. The double-sided conveyance unit is equipped with a second abutment surface that abuts on the first abutment surface. The first abutment surface and the second abutment surface are the surfaces against which the double-sided conveyance unit and the surface abut first when the conveyance cover is closed, if in a state where the conveyance cover is opened and the double-sided conveyance unit is separated from the conveyance cover. The abutment presses the double-sided conveyance unit toward a position to cause the conveyance cover to house the double-sided conveyance unit.

In accordance with an embodiment, an image forming apparatus comprises a sheet feed section and a conveyance control section. The sheet feed section is provided with a plurality of cassettes in which sheets of a plurality of categories are stored for each category of the sheets, and feeds a sheet stored in the cassettes. The conveyance control section enables, in a case in which a sheet is fed from a cassette in which sheets to be printed after the printing surfaces thereof are aligned are stored among the cassettes, a reversal unit reversing the front side and the back side of the sheet at the time when the sheet is fed to convey and discharge the sheet regardless of a printing method designated by a user.

A sheet feeding apparatus includes a first drive roller and a second drive roller disposed downstream of the first drive roller and configured to rotate at a peripheral speed greater than a peripheral speed of the first drive roller. The first drive roller includes a drive shaft and a roller portion. The roller portion is configured to contact the sheet and is movable relative to the drive shaft in an axial direction and a rotation direction of the drive shaft. One of the drive shaft and the roller portion of the first drive roller includes a protrusion protruding toward the other one of the drive shaft and the roller portion. The other one of the drive shaft and the roller portion of the first drive roller includes a recessed portion. The recessed portion includes a peripheral wall that defines an opening such that the protrusion is positioned in the opening.

An image forming apparatus configured to form images on a first surface and a second surface of a sheet includes an apparatus body, an image forming unit, a feed tray, and a return unit configured to return the sheet having an image formed on the first surface of the sheet toward the image forming unit. The return unit includes a first guide, a second guide, and an adjuster. The first guide is detachably attached to the second guide and includes a first roller and a positioned portion. The second guide is positioned in the apparatus body and includes a second roller facing the first roller, and a positioning portion configured to contact the positioned portion of the first guide, thereby positioning the first guide relative to the second guide. The adjuster is configured to adjust an orientation of the second guide relative to the apparatus body.

An image forming apparatus includes: a pair of rollers for conveying paper; a rocking mechanism for rocking the pair of rollers in a second direction orthogonal to a first direction, the first direction being a paper conveying direction; an upstream pair of rollers provided upstream of the pair of rollers in the paper conveying direction for conveying the paper; an upstream rocking mechanism corresponding to the upstream pair of rollers for rocking the upstream pair of rollers in the second direction; a first paper detector for detecting an end position of the paper in the second direction; and a controller controlling the rocking mechanism based on the paper end position to effect first rocking correction in which the pair of rollers is rocked, wherein the controller controls the upstream rocking mechanism to effect second rocking correction in which only the upstream pair of rollers is rocked.

An image forming apparatus includes an image forming device configured to form a first image on a first side of a recording medium and a second image on a second side of the recording medium, a position detector configured to detect respective positions of the first and second images, and a controller configured to perform, based on detection results obtained by the position detector, at least one of an image position correction by matching the first and second images and a magnification error correction by calculating and correcting a magnification error of one of the first and second images relative to the other. A program product used in the image forming apparatus includes a method of forming the first image and the second image, detecting the respective positions of the first and second images, and matching a position or a size of the first and second images.