Patent ID: 8340566

Claim:
An image forming apparatus comprising: a casing; a printing medium supply unit coupled to the casing, to supply a printing medium; an image forming unit to form an image on the printing medium supplied from the printing medium supply unit; a discharging part to discharge the printing medium from the image forming unit, out of the casing, and to back feed the printing medium to the image forming unit for duplex printing according to rotation of a rotation shaft; a back feeding unit comprising: a back feeding guide, and a direction change lever to change a feeding direction of the printing medium so printing medium positioned at a discharging part can be back fed to the back feeding guide for duplex printing; a feeding guide between the direction change lever and the discharging part, along a feeding path of the printing medium, to move to a discharging position having a distance between a feeding roller and the feeding guide being less than a distance between the feeding roller and a wall surface of the-casing to guide the discharge of the printing medium out of the casing, and to move to a back feeding position to guide the back feed of the printing medium to the image forming unit, the feeding guide being coupled to the casing; and a pressing lever to press and release the feeding guide, according to a movement of the discharging part, such that the feeding guide moves between the discharging position and the back feeding position, wherein the pressing lever moves in a longitudinal direction of the rotation shaft to press and release the feeding guide.