Patent ID: 8579275

Claim:
A duplex document feeding device comprising a first paper transfer channel, a second paper transfer channel and a paper exit, said duplex document feeding device further comprising: a power source for providing a motive power; a paper pick-up mechanism for feeding a paper into said first paper transfer channel, wherein said paper pick-up mechanism comprises a driving shaft, and said driving shaft is connected with said power source; a paper ejecting mechanism located at said paper exit, and comprising: an ejecting drive roller connected with said power source for ejecting said paper from said first paper transfer channel and then introducing said paper into said second paper transfer channel; and an ejecting idler roller contacted with said ejecting drive roller; and a linking mechanism in power communication with said power source and said ejecting idler roller, wherein after said paper is ejected from said first paper transfer channel and said paper is introduced into said second paper transfer channel by said paper ejecting mechanism, said linking mechanism is driven by said power source, so that said ejecting idler roller is shifted and moved away from said ejecting drive roller, wherein said linking mechanism is connected with said driving shaft and said ejecting idler roller.