A sheet handling apparatus includes: a transport path along which a sheet is transported; a first transport member disposed on one side of the transport path; and a second transport member disposed opposed to the first transport member with the transport path interposed therebetween. The first transport member and the second transport member are driven to rotate. The sheet is transported by the first transport member rotating with an outer peripheral surface thereof being in contact with a first face of the sheet, and by the second transport member rotating in a direction opposite to a rotation direction of the first transport member, with an outer peripheral surface thereof being in contact with a second face of the sheet different from the first face.

A conveyance device holds a sheet medium in a roll and includes a drive roller that feeds the sheet medium from the roll to a conveyance path; and a roll rotating unit that rotates the roll forward to convey the sheet medium toward the drive roller and in reverse to rewind the sheet medium and that has multiple drive modes with different speeds of rotation. A control unit controls driving the drive roller and the roll rotating unit, such that, when starting a reverse conveyance operation that rewinds the sheet medium, the control unit selects the drive mode to be used in the reverse conveyance operation based on a first conveyance distance, which is the distance the sheet medium is to be conveyed in the reverse conveyance operation, and the diameter of the roll stored as roll diameter information and as calculated after an immediately previous reverse conveyance operation.

An image forming apparatus and roller separation device are provided. The image forming apparatus including a main body having a print unit, a first paper feeding unit containing print paper and insertable in or pullable from the main body, a feed roller in the main body feeding the print paper from the first paper feeding unit to the print unit and comprising a driven roller contacting a driving roller, an elastic member applying an elastic force to the driven roller in a direction to contact the driving roller, a handle member in the main body movable to a first position and a second position, and a separation member connected to the handle member and switched to a normal position separated from the driven roller and a separation position separating the driven roller from the driving roller.

An image forming apparatus and roller separation device are provided. The image forming apparatus including a main body having a print unit, a first paper feeding unit containing print paper and insertable in or pullable from the main body, a feed roller in the main body feeding the print paper from the first paper feeding unit to the print unit and comprising a driven roller contacting a driving roller, an elastic member applying an elastic force to the driven roller in a direction to contact the driving roller, a handle member in the main body movable to a first position and a second position, and a separation member connected to the handle member and switched to a normal position separated from the driven roller and a separation position separating the driven roller from the driving roller.

An image forming apparatus includes: one paper cassette configured to accommodate a paper sheet; an image forming section provided above the paper cassette to form an image on the paper sheet; a main conveying path configured to convey the paper sheet; and a reverse conveying path configured to reverse the paper sheet, wherein the reverse conveying path includes: a first reverse conveying path provided side by side with the paper cassette to extend vertically; a second reverse conveying path configured to connect from the first reverse conveying path and extend below the paper cassette; a guide plate configured to open and close the first reverse conveying path and release pressure of a pair of paper conveying rollers; and an entry restricting unit provided at a boundary point between the first reverse conveying path and the second reverse conveying path to open and close a conveying course of the paper sheet.

A sheet feeding device includes a driving roller, a driven roller rotated by the rotation of the driving roller, a non-conductive feeding guide, a conductive frame, a conductive bearing and an urging member to urge the driven roller toward the driving roller. The feeding guide includes a supporting portion to displaceably support the rotation shaft in an urging direction. The frame includes a positioning portion to position the driven roller in the urging direction by contact with the rotation shaft in a state in which the driving roller is urged by the driven roller.

A sheet thickness detector incorporated in a sheet conveyor and/or an image forming apparatus includes multiple first rollers aligned in a direction perpendicular to a sheet conveying direction, multiple second rollers facing the respective first rollers, a first roller shaft supporting two first rollers, at least one second roller shaft supporting rollers other than the two first rollers, at least one third roller shaft to support at least three second rollers, a first roller shaft holder supporting the first roller shaft to move from the at least one third roller shaft in a contact/separation direction, a biasing member biasing the first roller shaft toward at least one third roller shaft, and a displacement amount detector detecting an amount of displacement of the first roller shaft. A thickness of a sheet between the first and second rollers is detected based on a detection result by the displacement amount detector.

An image forming apparatus, in which a method of correcting a positional deviation of a sheet is performed, includes a detecting device to detect a position of the sheet, a pair of sheet conveying bodies to convey the sheet and correct the positional deviation of the sheet, an image forming device to form an image on the sheet, and circuitry to calculate a first positional deviation amount of the sheet based on a first detection result of the detecting device, cause the pair of sheet conveying bodies to correct the positional deviation of the sheet based on the first positional deviation amount, calculate a second positional deviation amount of the sheet based on a second detection result of the detecting device, and cause the image forming device to correct the positional deviation of an image forming position on the sheet based on the second positional deviation amount.

A medium feeding device includes a lower portion unit in which a feeding roller is provided, and an upper portion unit in which a separating roller is provided and which is connected to the lower portion unit so as to be openable and closable. The lower portion unit has a cover member which covers a holding portion of the feeding roller while exposing a portion of the feeding roller to the transport path, and the cover member is configured to be removable in a direction including a component directed toward an upstream side in the transport direction by being attachable to and detachable from the lower portion unit.

A sheet conveyance device includes a conveyance roller to convey a sheet, an ejection roller to eject the sheet from the sheet conveyance device, a conveyance relay roller disposed between the conveyance roller and the ejection roller, a driven roller disposed in contact with the conveyance relay roller to form a nip, and an openable portion to open and close relative to a housing of the sheet conveyance device. A pivotable roller holder to pivot relative to openable portion is attached to the openable portion. The pivotable roller holder holds the conveyance relay roller and the driven roller to maintain a nip pressure between the conveyance relay roller and the driven roller when the openable portion is opened.