Automatic document feeder for input device

摘要

An automatic document feeder (1011) is constructed of three chassis (401, 601, 801). A main chassis (401) carries the active components. such as paper pick and drive mechanisms (1201) for sequentially picking and delivering medium sheets in seriatim to and from a computer input device (1101), motors, and transmissions for driving the paper pick and drive mechanisms (1201), a document backing assembly (1601), and electronic controller equipment. Moreover, the main chassis (401) provides a document input tray (403). A lower chassis (801) forms a low height form factor output tray (803), using paper stiffness caused by predetermined bending to register the document sheets without having to support the full length thereof. When assembled with an upper chassis (601), the three chassis (401, 601, 801) provide the entire paper path. The lower chassis (801) carries an attachment hinge mechanism (821) for removably mounting the automatic document feeder (1011) in proper alignment with the computer input device (1101) in a fast and convenient manner. A paper loading and unloading drive mechanism (2001) provides a balance normal force from a plurality of paper drive rollers (2007, 2008). The paper loading and unloading drive mechanism (2001) is used to lift the document backing assembly (1601) from a flat bed supporting surface (1701) of the computer input device (1101) during loading and unloading of document sheets.