Power transmission apparatus and image forming apparatus having the same

摘要

A power transmission apparatus and an image forming apparatus are provided. The power transmission apparatus of transmitting driving power to first and second movable members includes a driving unit which receives the driving power from a driving power source, and which rotates in forward and backward directions, a first driven unit which transmits the driving power to the first movable member, an elastic clutch which is provided between the driving unit and the first driven unit to selectively allow the driving power from the driving unit to be conveyed to the first driven unit based on the direction of the driving power, and a second driven unit to convey the driving power to the second movable member regardless of the direction of the driving power so as to allow the second movable member to rotate bi-directionally. The first movable member may be, e.g., a photosensitive body. The second movable member may be, e.g., exit rollers for ejecting processed printing medium out of the image forming apparatus.

主权项

1. A power transmission apparatus for transmitting driving power from a driving power source to at least first and second movable members of an image forming apparatus, the driving power being a bi-directional rotational power in first and second directions of rotation, the power transmission apparatus comprising:
a driving unit configured to receive the driving power transmitted from the driving power source and to convey the driving power to the first movable member so as to cause the first movable member to rotate in the first and second directions; a driven unit coupled to the second movable member; and an elastic clutch including a coil spring which is wound in a direction of driving the second movable member in the first direction and provided between the driving unit and the driven unit, wherein the second movable member comprises a photosensitive body.