Patent ID: 8355188

Claim:
A document guiding mechanism comprising: a document supporting tray; a gearwheel coupled to the document supporting tray; a right guiding unit comprising a right guiding wall sliding on the document supporting tray; and a right linear gear extended from the right guiding wall and engaged with the gearwheel; a left guiding unit comprising a left guiding wall sliding on the document supporting tray and opposite to and parallel to the right guiding wall; and a left linear gear extended from the left guiding wall and engaged with the gearwheel; and a single-way latch means interconnected the document supporting tray and at least one of the right guiding unit and the left guiding unit; wherein the single-way latch means comprises a positioning linear gear formed at the document supporting tray; a positioning gearwheel coupled to one of the right guiding unit and the left guiding unit; and a single-way latch latching the positioning gearwheel.