Importance

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Abstract

A peripheral powered document scanning device includes a frame, contact image sensor ('CIS') module, a drive platen, document drive platen bearings, springs, a non-enveloping worm drive assembly, a printed circuit board, and a document sensor. The frame comprises rigid members that include an upper frame member, a lower frame member, and right and left endplate members. The four-piece frame is configured so that the upper frame member and the lower frame member are opposite to each other and each is connected at their right and left ends to the right endplate member and the left endplate member, respectively. Each endplate member includes a longitudinal slot where the drive platen rests on the springs so that the drive platen moves in a longitudinal direction with respect to the frame. The CIS module is secured to the upper frame member and remains fixed with respect to the frame. The worm drive assembly includes a drive motor, a single start worm that has a helical tooth and is rotatably coupled to a shaft of the drive motor, and a worm gear that has gear teeth and is rotatably coupled to the drive platen. The helical tooth of the single start worm meshes with the gear teeth of the worm gear so that when the drive motor operates and the single start worm rotates, the worm gear also rotates. As the worm gear rotates, the drive platen rotates so that a document is transported through the scanning device for scanning. In an alternative embodiment, the components of the scanning device are assembled in a two-part case that is frameless.

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First Claim