A selectable drive printing device includes a drive selector system to select between driving a print drive system and driving a scan drive system based at least partially on a position of a selector swing arm of the drive selector system. The selectable drive printing device includes a shifter to selectively shift the drive selector system between a scanning system drive position of the selector swing arm and a printing system drive position of the selector swing arm.

An image forming apparatus includes an image reading unit, an original conveyance unit, a reversing unit, an image forming unit, an image forming conveyance unit, and a control unit. The original conveyance unit conveys an original in a first direction toward the image reading unit, which reads an image of the original. The reversing unit conveys an original passing through the image reading unit in the first direction, or reversely conveys the original toward the image reading unit in a second direction. The image forming unit forms an image on a sheet. The image forming conveyance unit conveys, to the image forming unit, an original reversely conveyed by the reversing unit via the image reading unit. The control unit controls an operation for reading an image of the original by using the image reading unit and for overprinting the original with an image by using the image forming unit.

When a sheet fed by a feed rotating member passes through a detection area of a leading edge detecting portion, the feed rotating member is moved to a retract position based on the detection. When the fed sheet does not pass through the detection area, the feed rotating member is moved to the retract position after a predetermined time elapses since the sheet starts to be fed by the feed rotating member.

An image processor includes a detector, a processor, and a generator. The detector is configured to detect whether a specific pattern is present at a first position in first image data. The processor is configured to generate data information, based on a detection result derived from the detector. The generator is configured to generate second image data by disposing the data information at a second position that corresponds to the first position.