A stapling device of a paper finishing device of one embodiment of the present disclosure includes a stapler including an entrance into which one side of paper is inserted, a moving part including a stapler moving bracket on which the stapler is seated and a moving roller installed on the stapler moving bracket, a driving part which moves the stapler moving bracket, a base frame on which the stapler moving bracket and the driving part are installed, and which includes a horizontal guide surface extending along the one side of the paper, a first corner stapling guide surface spaced apart from the horizontal guide surface, and a first inclined guide surface which diagonally connects the horizontal guide surface and the first corner stapling guide surface, and a position guide part which is installed on the base frame and includes a second corner stapling guide surface and a second inclined guide surface which diagonally connects the horizontal guide surface and the second corner stapling guide surface and is inclined to be opposite to the first inclined guide surface.

An image forming apparatus includes an image carrier, a charging device, a developing device, a transfer member, a registration roller pair, a conveyance guide, and a first cover member. The conveyance guide includes a first conveyance guide opposing one surface of a recording medium conveyed from the registration roller pair to a transfer nip, the one surface being on a side of image carrier, and a second transfer guide opposing another surface of the recording member, the other surface being on a side of the transfer member. The first cover member covers an area along a peripheral surface of the image carrier from the developing device to the transfer member, and forms a substantially sealed space together with the image carrier, the developing device, the transfer member, the registration roller pair, and the transfer guide. A through hole is formed in the first transfer guide.

An image forming apparatus includes a registration unit, a first paper feeding unit, a second paper feeding unit, and a control unit, which performs a primary paper feeding for conveying a paper sheet to a registration position, finishes the primary paper feeding at timing when the paper sheet reaches the registration position, and then after operating a target paper feeding unit until a preceding feeding time elapses, performs a secondary paper feeding for conveying the paper sheet to the printing position. The control unit sets different values of the preceding feeding time for the case where the first paper feeding unit is the target paper feeding unit and the case where the second paper feeding unit is the target paper feeding unit.

An image formation device includes: a registration roller pair configured to shift sheet in a second direction perpendicular to a first direction of a sheet feeding direction while holding the sheet; a feeding section provided upstream of the registration roller pair in the first direction and including a feeding belt configured to convey the sheet to the registration roller pair; a first air adjustment section configured to perform air suction or blowing for the sheet conveyed by the feeding belt; and a control section configured to switch between a first operation of controlling, when the sheet is conveyed by the feeding belt, the first air adjustment section to suck the sheet with air and a second operation of controlling, when the sheet is swung by the registration roller pair, the first air adjustment section to blow air on the sheet.

A sheet conveying device, which is incorporated in an image forming apparatus, includes a first detector to detect an angle deviation of a recording medium to a sheet conveying direction, a second detector to detect a lateral shift of the recording medium to a width direction, a third detector to detect at least one of the angle deviation and the lateral shift after correction of the angle deviation detected by the first detector and the lateral shift detected by the second detector, and a rotary body to perform a primary movement by (1) rotating in the sheet conveying direction and returning to a reference position and by (2) moving in the width direction and returning to the reference position, and a secondary movement by performing at least one of (1) and (2) after the primary movement.

An edge detection apparatus for detecting an edge of a recording medium to be conveyed includes a light source, a plurality of photoelectric conversion element pixels, and a detection unit. The light source irradiates the recording medium with light. The plurality of photoelectric conversion element pixels are placed in a direction orthogonal to a conveyance direction of the recording medium and convert light reflected by the recording medium into an electrical signal. The detection unit detects the edge of the recording medium on the basis of a plurality of electrical signals that constitute an n-th (n≧1) electrical signal group obtained by dividing the plurality of electrical signals corresponding one-to-one to the plurality of photoelectric conversion element pixels, and a specified number of the electrical signals counted from a top of the plurality of electrical signals that constitute an n+1st electrical signal group.

An image forming apparatus including an image bearing member, an image forming portion, a transfer portion, a moving portion, a re-conveyance portion, a detection portion, a detection portion, and a control portion is provided. The moving portion is configured to move a sheet in a width direction. The re-conveyance portion is configured to invert the sheet bearing a toner image transferred onto a first surface thereof and convey the sheet to the transfer portion again. The control portion is configured to control the image forming portion to form the toner image for the first surface on a first image position and a toner image for a second surface on a second image position and control the moving portion to move the sheet to a position corresponding to the first image position or the second image position. The first and second image positions are displaced from each other.

A sheet stacking tray that includes a single pneumatic baffle which uses the pressure differential caused by the flow of air across a horizontal planar surface of the pneumatic baffle to hold the lead edge of sheets driven by an input nip into the sheet stacking tray above a stack especially for longer and lighter weight sheets as they are driven by the input nip to a registration wall.

An image forming apparatus is configured such that in a case where images are to be formed on a first surface of a preceding sheet, on a first surface of a succeeding sheet fed to the first conveyance path succeeding to the preceding sheet and on a second surface of the preceding sheet, a first conveyance member is stopped without reversing the preceding sheet to a second conveyance path in a case where the image has been formed on the first surface of the preceding sheet and permission of preparing the image to be formed on the first surface of the succeeding sheet is not issued yet. The first conveyance member restarts conveyance of the preceding sheet to the second conveyance path based on timing when an image forming unit starts preparing the image to be formed on the first surface of the succeeding sheet.

An image forming apparatus, in which a method of positional adjustment performed in image forming, includes an image bearer, a transfer device to transfer an image formed on the image bearer onto a recording medium having a first side and a second side, a recording medium conveying path along which the recording medium travels to the transfer device, a first detector and a second detector to detect positional information of the recording medium on or near the recording medium conveying path, in which the first detector being disposed closer to the transfer device than the second detector to the transfer device in a sheet conveying direction on the recording medium conveying path, and an adjuster to adjust a position of the image based on at least one of former positional information obtained by the first detector and current positional information obtained by the second detector.