Sheet-fed scanner with selectively variable document feed-in and feed-out positions

A sheet-fed scanner with selectively variable document feed-in and feed-out positions is provided. The sheet-fed scanner includes conventional scanning means for performing a scanning process on a document; conventional diving means for driving the document through the scanning process, a base plate; a main body for accommodating the scanning means and the driving means therein, the main body, being mounted on the base plate and having at least a base side, a first inclined side, and a second inclined side; and a passage formed between the base plate and the main body for guiding the document through the scanning process. By resting the sheet-fed scanner on various sides of the main body, the user can feed the document from various positions: when resting on the base plate, the passage is horizontally oriented, allowing a horizontal feed-in and feed-out of the document; when resting on the first inclined side, the passage is inclined in such a manner that allows an inclined top feed-in and bottom feed-out of the document; and when resting on the second inclined side of the main body, the passage is inclined in such a manner that allows an inclined bottom feed-in and top feed-out of the document. Moreover, the main body can be shaped in either a pentagonal or trapezoidal cross section so as to elevate either the feed-in and feed-out positions for either inclined or horizontal feed-in and feed-out.