Patent ID: 7529494

Claim:
An image forming apparatus having a developer to apply developing material to a printing medium, the apparatus comprising: a fixing roller to fix the developing material to the printing medium; a paper discharging roller to discharge the printing medium according to a transporting speed pattern in which the printing medium is accelerated from a first speed to a second speed after the developing material is fixed to the printing medium and then the printing medium is decelerated from the second speed to a third speed that is slower than the first speed before the printing medium leaves the paper discharging roller; and a transporter comprising: a transporting roller, interposed between the fixing roller and the paper discharging roller, to transport the printing medium from the fixing roller to the paper discharging roller, a driver to drive the transporting roller in a transporting direction at the first speed, and a one-way clutch, interposed between the transporting roller and the driver, to transmit a driving force of the driver to the transporting roller only in the transporting directions, wherein the paper discharging roller begins accelerating the printing medium from the first speed to the second speed after the printing medium leaves the fixing roller and before the printing medium leaves the transporting roller.