Image forming apparatus and control method thereof

A method to control an image forming apparatus including a printing medium discharge unit which includes a first discharge roller to feed a printed printing medium rearward from a print unit disposed at an inner front portion of a main body, a reverse roller to reverse a moving direction of the printed printing medium fed from the first discharge roller from a rear to a front of the main body, a second discharge roller to discharge the printed printing medium whose moving direction is reversed outside, and an intermediate discharge roller which is provided between the first discharge roller and the reverse roller and has a main roller, a sub discharge roller and a sub supply roller which are in contact with the main roller, and a sensor which is provided between the print unit and the first discharge roller to sense a rear end of the printed printing medium, the method comprising:

• if the rear end of a preceding printed printing medium is sensed by the sensor, reversing the moving direction of the preceding printed printing medium by the reverse roller after lapse of a predetermined time;
• and
• if the preceding printed printing medium whose moving direction is reversed advances between the main roller and the sub discharge roller, advancing a following printed printing medium successively fed from the print unit between the main roller and the sub supply roller.

An image forming apparatus, comprising:

• an intermediate discharge roller unit having a swing roller to move between a first position and a second position based on at least one or more predetermined time periods and a selected printing mode, and a reverse roller to interact with the swing roller in the second position to change a path of the printing medium.