Patent ID: 7793776

Claim:
A transmission device for a scanner, installed in a base of the scanner, said device comprising: an image acquisition module, disposed in said base; a rotating wheel, pivotally connected to a first side of said base; a first roller, pivotally connected to a second side of said base away from said rotating wheel, a size of the first roller being smaller than that of the rotating wheel; a driving roller, positioned below said first roller, a size of the driving roller being larger than that of the first roller; a conveyor, one end thereof being put around said rotating wheel, another end thereof being put around said first roller and said driving roller; and a second roller, pivotally connected to the base and being disposed between said rotating wheel and said driving roller, for withstanding said conveyor between said rotating wheel and said driving roller to allow said conveyor between said rotating wheel and said second roller to be parallel to said conveyor between said rotating wheel and said first roller, a size of the second roller being smaller than that of the driving roller; wherein said driving roller drives said conveyor to move said image acquisition module, and said image acquisition module is movable to an upper side of said first roller, to allow a starting point of the movement of said image acquisition module to be close to a rim of said base so as to reduce a volume of said base.