How Do Sheet-fed Scanners Work?
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Sheet Fed Scanners Use a Conveyor
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When a user loads documents in a sheet fed scanner, the documents are placed in sequence in a hopper where they are queued before being fed into the scanner one at a time. As each page's turn comes, a series of rollers specially spaced for the thickness of a single page pulls the waiting document into scanner. As the document enters the machine, a viscid conveyor pulls the document completely in and moves it to the scanning surface.
The Scanner Creates an Image of the Document
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With the original document in place on the scanning surface, it is ready to be converted into a digital copy. A scanning wand moves underneath the scanning surface, shining a light onto the original document. The reflected light is interpreted by the scanner and converted into a series of ones and zeros--a digital representation of the document. The scanning wand generally moves from the top of the document to the bottom; the speed depends on the make and model of the scanner. When the document has been scanned, it is ready to be ejected.
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The Conveyor Removes the Document
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When scanning is complete, the same conveyor that brought the document to the scanning surface again goes into motion and pulls the document off of the scanning surface. A series of rollers and gears pushes the document out of the scanner and either into the back of the waiting queue or into a designated receptacle. If more original documents are waiting in the hopper, the next original is pulled in using the same process described in Section One above.
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