An image forming apparatus includes a reverse roller pair including a drive roller and a driven roller by which a recording medium is nipped and conveyed reversibly, a motor configured to rotate the drive roller reversibly, a conveyance roller pair, a detection unit configured to detect the recording medium conveyed by the conveyance roller pair, and a controller configured to control the motor, in a case in which the recording medium is detected by the detection unit, to cause the drive roller to rotate in a first rotation direction by a first rotation amount, thereafter to cause the drive motor to rotate in a second rotation direction by a second rotation amount. A difference between the first rotation amount and the second rotation amount is set to an integer multiple of a predetermined rotation amount of the motor, the predetermined rotation amount making the drive roller one rotation.

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.

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.

A cleaning device includes a separation and contact mechanism that separates a web from a conveyance roller and brings the web into contact with the conveyance roller, and a controller. The controller includes a conveyed sheet number determination unit and a separation and contact control unit. The conveyed sheet number determination unit monitors a conveyed sheet number of both-surface image forming sheets where image forming processing is applied to both a first surface and a second surface with respect to the sheets conveyed by the conveyance roller, and determines whether or not a cumulative value of the conveyed sheet number has reached a predetermined threshold value. The separation and contact control unit controls the separation and contact mechanism so as to allow the web to be pressed to the conveyance roller by a pressing roller when the cumulative value of the conveyed sheet number has reached the threshold value.

An image forming system cyclically conveys an Nth sheet with an image formed on a first side to an image forming unit as a sheet subject to image formation after image formation on a subsequent (N+i)th sheet, and form an image on a second side of the Nth sheet. The system includes an obtaining unit that, during image forming processes, obtains respective updated adjustment values for the first and second sides, and a control unit that performs control to simultaneously store the updated adjustment value for the first side and an unupdated adjustment value for the second side in a part of a period of the processes, form an image on the first side of the (N+i)th sheet using the updated one for the first side, and form the image on the second side of the Nth sheet using the unupdated one for the second side.

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.

A printing system includes a printing unit, a determination unit, and a switching unit. The printing unit prints an image on a recording medium. The determination unit compares a prestored reference image and a read image corresponding to a reading result of a printed document in which the image is printed on the recording medium and determines whether a result of the comparison satisfies a predetermined condition. The switching unit switches a discharge destination of the recording medium based on a result of the determination. The switching unit switches a conveyance path of the recording medium based on whether the determination is performed.

An image forming apparatus, includes: plural image forming units each including an image holding member and configured to form an image that is to be transferred to a recording medium on the image holding member using a dry toner, the number of the plural image forming units being at least five; and plural developing devices each of which is provided in each of the plural image forming units and supplied with the dry toner and a dry carrier, each of the plural developing devices including a dry toner adhering unit that has a length equal to or longer than a length of a long side of an A3 size and to which the dry toner adheres, the dry toner adhering unit being configured to cause the dry toner adhering to the dry toner adhering unit to adhere to the image holding member.

A peripheral with a pivotal turn-over guiding mechanism includes: a transporting mechanism; first to third passages; an image processing unit disposed on the first passage, wherein after the image processing unit performs a first image process on a first side of a medium, the transporting mechanism transports the medium into, partially out of and back into the second passage, into the third passage, and then into the first passage, and the image processing unit performs a second image process on a second side of the medium; and a guide member, which is rotatably disposed at a connection portion of the third passage, the second passage and the first passage, normally closes a forward path from the first passage to the second passage, and normally opens a reverse path from the second passage to the third passage.

An image forming apparatus configured to form images on both sides of a sheet, includes an image forming unit, which is configured to form an image on an image bearing member, and a sheet conveying device, which is configured to move the sheet being conveyed toward a width direction, which is orthogonal to a conveyance direction. After the formed image is transferred onto a first surface of the sheet, the image forming apparatus inverts and conveys the sheet to transfer an image onto a second surface. Moreover, a side edge position of the sheet in the width direction is detected during conveyance for the transferring onto each of the first surface and the second surface, and an image writing start position for the image forming unit is determined based on a result of the detection to store a result of the determination in a memory.