Patent ID: 8755700

Claim:
An image forming apparatus comprising: a transport unit that transports a roll-like medium on which a plurality of marks are formed at predetermined intervals in a transport direction of the roll-like medium; an image forming unit that forms an image on the medium transported by the transport unit; a reading unit that is disposed such that the reading unit opposes positions at which the plurality of marks on the medium are formed so as to read the medium and to generate read information; a detecting unit that detects the plurality of marks from the read information generated by the reading unit in accordance with predetermined times based on the predetermined intervals of the plurality of marks formed on the medium; a position adjusting unit that adjusts a position of the image to be formed on the medium using the image forming unit on the basis of a result of detecting the plurality of marks by the detecting unit; and a speed adjusting unit that adjusts a transport speed of the medium transported by the transport unit on the basis of the read information generated by the reading unit, wherein each of the plurality of marks comprise a rectangular mark formed of a black color region and a white-color oblique line portion in the black color region.