Patent ID: 8493633

Claim:
An image scanner, comprising: an optical window; an assist roller positioned in movable spaced relation to the optical window for receiving media; an adjustment mechanism, operatively connected to the assist roller, for moving the assist roller to adjust the distance between the optical window and the assist roller, the adjustment mechanism being coaxial with the assist roller; and a calibration strip, operatively connected to the adjustment mechanism, for rotating and positioning the calibration strip in alignment with the optical window at selected intervals when media scanning is not occurring; wherein the adjustment mechanism can be disposed in a rest position, in which the assist roller is positioned to receive media, and the calibration strip is rotated out of view of the scanner, or an operative position, in which the calibration strip is rotated into alignment with the optical window, interposed between the optical window and the assist roller, and the assist roller is cammed away from the optical window a distance sufficient to allow the calibration strip to rotate into the operative position.