Patent ID: 7450143

Claim:
An electro-photographic image forming device that is capable of controlling a print speed and having an engine mechanism, the engine mechanism comprising a laser scanning unit for scanning lights onto a photosensitive medium, a developing unit for developing an electrostatic latent image formed on the photosensitive medium by the laser scanning unit with a developer, a transfer roller for transferring the developed image to a record sheet being fed, and a fixing unit for fusing the image transferred on the record sheet by applying heat and pressure on the image, the electro-photographic image forming device comprising: a first driving unit, for driving the laser scanning unit; a second driving unit, for driving at least one of the photosensitive medium, the developing unit, the transfer roller, and the fixing unit; and a controller, for controlling the first and second driving units so as to have the laser scanning unit driven at a first driving speed, and to have at least one of the photosensitive medium, the developing unit, the transfer roller, and the fixing unit driven at a second driving speed in the engine mechanism, and remove a portion of print data corresponding to a sub scanning direction only, when it is determined that a print mode for printing desired print data is set to a draft mode.