Patent ID: 7920814

Claim:
An apparatus comprising: a first roller having a first axle and a first outer surface, said first axle having a first fixed end and a first movable end; a second roller having a second axle and a second outer surface, said second axle having a second fixed end and a second movable end, said first roller and said second roller being located at different positions; a belt supported by said first roller and said second roller, said belt having an inner surface contacting said first outer surface of said first roller and said second outer surface of said second roller; a first sensor at a first location adjacent said first roller, said first sensor measuring a first lateral position of said belt at said first location; a second sensor at a second location adjacent said second roller, said second location being different from said first location along a length of said belt and said second sensor measuring a second lateral position of said belt at said second location; a plurality of additional sensors at additional locations between said first location and said second location along said length of said belt, said additional sensors measuring additional lateral positions of said belt at said additional locations; and a controller in communication with said first sensor, said second sensor, and said additional sensors, said controller further being operatively connected to said first axle and said second axle, said controller causing movement of said first movable end and movement of said second movable end in order to selectively adjust said first lateral position of said belt at said first location and said second lateral position of said belt at said second location and, as a result, to adjust said additional lateral positions of said belt at said additional locations such that a desired lateral edge belt alignment is achieved.