| 摘要 |
The present invention discloses a duplex document feeder for installed in scanning devices such as facsimile machine, printer, scanner or multi function peripheral (MFP). The duplex document feeder can control the motion accuracy of the sheet and avoid the happening of jam. The duplex document feeder includes a pick-up module, a sheet-controlling roller module and a an ejection module. The pick-up module is used for feeding the sheet into a first feed channel; the sheet-controlling roller module provides a first nip force to feed the sheet outside the duplex document feeder and provides a second nip force to feed the sheet into the interior of the duplex document feeder again; the ejection module provides a third nip force to feed/eject the sheet into/from the duplex document feeder.
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