Image forming apparatus and paper feeding method used with the same

An image forming apparatus, comprising:

• a pick-up roller to pick up an image recording medium from an image recording medium tray and to forward the picked-up image recording medium at one of a plurality of speeds;
• a sensing unit to sense a type of image recording medium being picked-up by the pick-up roller and to generate a signal corresponding to the sensed type of image recording medium;
• a paper arrangement unit which applies a constant pressure to a front edge of the picked-up image recording medium and aligns the image recording medium to be transferred along a paper path;
• and
• a control unit to receive the generated signal from the sensing unit and to control the pick-up roller speed based on the generated signal.

An image forming apparatus, comprising:

• a feeding unit to feed an image recording medium from an image recording medium tray at one of a plurality of speeds;
• a sensing unit to sense a type of image recording medium to be fed by the feeding unit and to generate a signal corresponding to the sensed type of image recording medium;
• a paper arrangement unit which receives the fed image recording medium from the feeding unit and transfers the image recording medium along a paper transfer path while applying a predetermined bias to a front edge of the image recording medium in an opposite direction to the feeding direction in order to align the image recording medium along the paper transfer path;
• and
• a control unit to receive the generated signal from the sensing unit and to control the feeding unit at one of the plurality of speeds based on the generated signal.