An image forming apparatus includes a reverse roller pair configured to reverse a conveyance direction of a recording medium between a first direction and a second direction, a first conveyance roller pair configured to convey the recording medium in the first direction, and a second conveyance roller pair configured to convey the recording medium in the second direction. A first distance is between the first conveyance roller pair and a reversal position in which a trailing edge of the recording medium is located when the conveyance direction is reversed. A second distance is between the reversal position and the second conveyance roller pair. An absolute value of a difference between the first distance and the second distance is an integer multiple of a circumferential length of a drive roller of the reverse roller pair or within a predetermined range from the integer multiple.

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.

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.

A sheet conveyance apparatus includes a first conveyance portion configured to convey a sheet, a second conveyance portion configured to convey the sheet, the second conveyance portion including an abutment portion configured to form a loop on the sheet by being abutted against a leading edge of a sheet conveyed by the first conveyance portion, a curved guide portion, which is curved, configured to guide the sheet conveyed by the first conveyance portion to the second conveyance portion, and a rotary member arranged downstream of the first conveyance portion and upstream of the second conveyance portion in a sheet conveyance direction, and configured to be driven to rotate by a surface of the sheet that is guided by the curved guide portion, the surface sliding against the curved guide portion.

An image forming apparatus includes an image forming unit including an image bearing member, and a transfer unit, a fixing unit, a re-conveyance unit, a detection unit, and a control unit configured to execute a booklet mode while creating a booklet, the booklet including a first sheet having a first surface and a second surface opposite to the first surface, and a second sheet having a third surface arranged adjacent to the second surface of the first sheet. The control unit is configured to control the image forming unit such that, in the booklet mode, a toner image is transferred to the second surface before a toner image is transferred to the first surface of the first sheet, and a toner image to be formed on the third surface of the second sheet is corrected based on an information of the second surface detected by the detection unit.

An image forming apparatus includes: a conveying unit configured to convey continuous paper in a forward direction and in a reverse direction; an image forming unit configured to form an image on the continuous paper conveyed in the forward direction; a fixing unit configured to fix the image formed onto the continuous paper; an adjusting unit configured to adjust the image forming unit while the continuous paper is conveyed in the reverse direction; and a control unit configured to cause the conveying unit to convey the continuous paper in the reverse direction by an amount equivalent to a predetermined reverse conveyance distance to adjust the bottom edge of the image in a conveying direction to a position on an upstream side of the image forming unit, and cause the conveying unit to convey the continuous paper in the forward direction and cause the image forming unit to resume image formation.

An image forming apparatus includes: a toner image forming section; a transfer section; a fixing section; a conveyance roller section disposed on a downstream side of the fixing section in a sheet conveyance direction; a conveyance guide section disposed on a downstream side of the conveyance roller section and including a first guide member disposed on a fixing side of a sheet and a second guide member disposed on a rear surface side of the sheet; a feeding-path-switching section disposed on a downstream side of the conveyance guide section and configured to switch sheet feeding paths; and a nip angle adjusting section configured to change a nip angle of a conveyance nip in accordance with whether a sheet on which an image is formed on a first surface thereof is conveyed, or a sheet on which an image is formed on a second surface thereof is conveyed.

An image forming apparatus including an image forming unit, a discharging portion, a supporting portion, an image reading portion, and a switching portion is provided. The image forming unit is configured to form an image on a sheet. The discharging portion is configured to discharge the sheet on which the image has been formed. The supporting portion is configured to support the sheet discharged by the discharging portion. The image reading portion is configured to read, at a reading position, the image formed on the sheet. The switching portion is configured to switch between causing the sheet discharged by the discharging portion to be conveyed to the supporting portion and causing the sheet discharged by the discharging portion to be conveyed toward the image reading portion. The sheet conveyed toward the image reading portion is conveyed to the reading position after conveyance by the discharging portion is finished.

An image forming apparatus includes an image forming unit, a paper loading base on which manual-feed paper is loaded, a manual-feed paper conveying unit, and a dustproof cover which covers the paper loading base being in the overhang state. The paper loading base has a lower end rotatably supported on one outer surface portion of the device main body, and is opened from an upper end thereof and disposed at a predetermined oblique angle or in a horizontal overhang state such that an overhang side becomes an upper side in an oblique direction. The manual-feed paper conveying unit is conveys the manual-feed paper on the paper loading base onto a paper conveyance path one by one. The dustproof cover includes a base which engages with the paper loading base, and an opening-and-closing cover which is rotatably connected to the base and is opened upwardly on the overhang side.

A sheet conveyer, comprising: a 1st conveying roller; a 1st support part to support the 1st conveying roller; a 1st helical gear to rotate together with the 1st conveying roller and to generate thrust in a particular direction; a 2nd conveying roller; a 2nd support part to support the 2nd conveying roller; a 2nd helical gear to generate thrust in the particular direction; a 3rd helical gear to engage with the 1st helical gear; a 4th helical gear to engage with the 2nd helical gear; and a clutch to connect or disconnect transmission of a driving force between the 3rd helical gear and the 4th helical gear, wherein: when the clutch is disconnected, the 1st and 2nd conveying rollers are disposed at an initial position, and when the clutch is connected, the 1st and 2nd conveying rollers move from the initial position in the particular direction.