Patent ID: 7194221

Claim:
An image forming apparatus comprising: a paper exhaust unit including an upper frame and a lower frame for rotatably supporting a plurality of paper exhaust rollers for exhausting a sheet of paper on which an image is formed outside of a main body and a heat dissipating unit for preventing heat generated in a fusing unit from being transferred to an upper cover of the main body via convection and dissipating heat, wherein the heat dissipating unit comprises: a shielding member protruding from a top surface of the upper frame adapted to form a chamber portion having a predetermined area together with the upper cover of the main body covering the shielding member so as to include a plurality of heat dissipating holes perforated in the upper frame at predetermined intervals along a lengthwise direction; and a pump installed at one side of the chamber portion adapted to blow air into the chamber portion so that the air supplied from the pump to the chamber portion flows downstream from the upper frame through the plurality of heat dissipating holes, collides with the air that is naturally convected by heat generated by a fusing roller, forms a laminar boundary layer flow having a predetermined thickness, and prevents heat from being transferred to the upper frame of the paper exhaust unit.