Patent ID: 8724149

Claim:
An image forming apparatus comprising: an image reading unit that reads image data corresponding to one line of an original document with a line period, the image reading unit including, a first image data reading unit that reads first image data which is image data of a first surface of the original document, and a second image data reading unit that reads second image data which is image data of a second surface of the original document; a first transfer unit that transfers the image data, the image data being read by the image reading unit and being input to the first transfer unit; a transfer control unit that controls the first transfer unit to transfer the image data; an image forming unit that forms an image on a medium on the basis of the image data transferred by the first transfer unit, wherein the transfer control unit controls the first transfer unit to transfer the image data corresponding to one line of the original document every time when a set time period passes, the set time period being shorter than a time length of the line period; and a second transfer unit that transfers the first image data read by the first image data reading unit and the second image data read by the second image data reading unit to the first transfer unit, respectively, wherein when the first image data is transferred, the second transfer unit transfers the first image data corresponding to one line of the original document to the first transfer unit every time when the time length of the line period passes, and when the second image data is transferred, the second transfer unit transfers the second image data continuously line by line to the first transfer unit.