Paper feeding apparatus and image forming apparatus including the same

摘要

A paper feeding apparatus includes a transfer roller that provides a transfer force of a first direction onto the upper surface of a recording medium; a retard roller that faces the transfer roller to form a transfer nip and provides a transfer force of a second direction opposite to the first direction onto the lower surface of the recording medium; a driving unit that drives the retard roller; and a power delivery unit that connects the driving unit to the retard roller by using a magnetic force and provides a magnetic driving force that is smaller than the transfer force provided 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.

主权项

1. 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.