Paper feeding apparatus and image forming apparatus including the same

An image forming apparatus comprising:

• a paper feeding apparatus comprising a transfer roller that exerts a transfer force of a first direction onto an upper surface of a plurality of recording media, a retard roller that faces the transfer roller to form a transfer nip and exerts a transfer force of a second direction opposite to the first direction onto a lower surface of the plurality of recording media, a driving unit that drives the retard roller, and a power delivery unit that connects the driving unit to the retard roller by a magnetic driving force that is smaller than the transfer force exerted by the transfer roller when one recording medium exists in the transfer nip and is larger than a frictional force between two or more recording media when the two or more recording media exist in the transfer nip;
• a printing device for forming an image on a recording medium among the plurality of recording media transferred from the paper feeding apparatus;
• and
• a discharge device for discharging the recording medium printed by the printing device.