A controller is configured to control a print engine and a conveyor to form an image on both sides of a sheet. The controller is configured to: in a case where images to be formed on both sides of each of an Nth (N is a positive integer) sheet, an (N+1)th sheet, and an (N+2)th sheet are all monochrome image or all color image, convey the (N+2)th sheet to the print engine and form an image before forming an image on both sides of the (N+1)th sheet; and in a case where the images to be formed on both sides of each of the Nth sheet, the (N+1)th sheet, and the (N+2)th sheet are a mixture of the monochrome image and the color image, convey the (N+2)th sheet to the print engine and form an image after forming an image on both sides of the (N+1)th sheet.

An image forming apparatus for forming an image on a sheet, includes an image forming unit configured to form the image on the sheet, a double-sided conveyance path through which the sheet with the image formed on a first surface passes before the image forming unit forms an image on a second surface opposite to the first surface, a guide member having a contact portion configured to contact one end of the sheet in the width direction of the sheet, the guide member being provided on the double-sided conveyance path, and a reversing roller pair forwardly and reversely rotatable, configured to convey the sheet to the double-sided conveyance path during a reverse rotation, the reversing roller pair having a drive shaft, and a first roller and a second roller coaxially disposed on the shaft, rotatable with the shaft, wherein the second roller is disposed at a position more away from the contact portion than the first roller in the axial direction of the shaft, the second roller having a larger outer diameter than the first roller.

Provided is a sheet conveying apparatus that includes a conveying unit capable of changing its posture through rotation, and forms a sheet conveyance path capable of conveying a sheet without fail regardless of which posture the conveying unit is in. A first conveying unit is capable of being in a first posture and in a second posture by rotating from the first posture. In a case where the first conveying unit is in the first posture, a sheet conveyance path is formed in which the first conveyance path, the second conveyance path, and the third conveyance path are connected in this order. In a case where the first conveying unit is in the second posture, a sheet conveyance path is formed in which the first conveyance path and the third conveyance path are connected in this order.

Provided is a sheet conveying apparatus that includes a conveying unit capable of changing its posture through rotation, and forms a sheet conveyance path capable of conveying a sheet without fail regardless of which posture the conveying unit is in. A first conveying unit is capable of being in a first posture and in a second posture by rotating from the first posture. In a case where the first conveying unit is in the first posture, a sheet conveyance path is formed in which the first conveyance path, the second conveyance path, and the third conveyance path are connected in this order. In a case where the first conveying unit is in the second posture, a sheet conveyance path is formed in which the first conveyance path and the third conveyance path are connected in this order.

Provided is an image forming apparatus, in which a recording material is conveyed by a reverse portion rotated in a first direction at a first velocity which is faster than a conveyance velocity of the recording material in a fixing portion after a rear end portion of the recording material passes through the fixing portion, and then, the recording material is conveyed to a conveying portion by the reverse portion rotated in a second direction opposite to the first direction through a conveyance path at a second velocity which is faster than the conveyance velocity of the recording material in the fixing portion, and a conveyance velocity of the recording material is set to a third velocity which is slower than the second velocity at a predetermined timing before the rear end portion of the recording material reaches a curved portion of the conveyance path.

An image forming apparatus includes an image forming portion, a reversing portion configured to reverse the sheet received through a first feeding passage by feeding the sheet in a first direction and then in a second direction opposite to the first direction, a sheet feeding portion provided in a second feeding passage branching from the first feeding passage on a side upstream of the reversing portion with respect to the first direction, a first guiding surface forming the second feeding passage for guiding a first surface of the sheet fed by the feeding portion, and a second guiding surface for guiding a second surface, opposite from the first surface, of the sheet fed from the reversing portion in the second direction. The second guiding surface is movable with movement of the first guiding surface for opening the second feeding passage.

An image forming apparatus includes an engine to form an image on an image forming medium, a paper transfer device to pick up a printing paper and transfer the paper to a transfer path, a sensor to sense a printing paper at a predetermined position on the transfer path, and a processor to determine whether a transfer delay occurs, when the printing paper is sensed, and adjust a pickup timing to advance a pickup of a printing paper of a next page.

A sheet discharge apparatus includes a stack portion, a reversing unit configured to reverse a reversing sheet, a support member configured to support a lower surface of the reversing sheet, a discharging unit configured to discharge a discharging sheet from the apparatus body, a pivotable member arranged above the stack portion, and a detector configured to output a detection signal that changes according to a pivot angle of the pivotable member. When viewed in a sheet width direction perpendicular to the first conveyance direction, a pivoting locus in which the pivotable member pivots overlaps the support member.

An image forming apparatus includes an image forming portion to form an image on an image bearing member, and a transfer portion to transfer the image on a first image position on the image bearing member to a sheet. In addition, a controller determines a second image position, on the image bearing member, of an image to be transferred onto a second surface of a sheet re-conveyed to an adjustment portion by a reverse and re-conveyance portion based on a detected side edge position, of a trailing part of the sheet being conveyed with a first end as the leading edge. The trailing part of the sheet is positioned on a trailing edge side further than a center position, in the sheet conveyance direction, of the sheet, and the controller determines a shift amount based on the second image position and detected side edge position of the sheet, which has been re-conveyed, being conveyed with the second end as the leading edge.

A sheet conveyance apparatus comprises: a first conveyance roller configured to convey a sheet; a second conveyance roller, arranged downstream of the first conveyance roller in the conveyance direction in which the sheet is conveyed, configured to convey the sheet; a first conveyance path configured to guide the sheet from the first conveyance roller to the second conveyance roller; a second conveyance path, which is branched from the first conveyance path between the first conveyance roller and the second conveyance roller to guide the sheet, the second conveyance path having a bent portion; a third conveyance roller configured to convey the sheet guided by the second conveyance path; a first motor configured to drive the third conveyance roller; a second motor; a first transmission mechanism configured to transmit a driving force of the second motor to the second conveyance roller.