A fast scan axis for a high speed flat bed scanner has an elongated reciprocating table for securing the material to be scanned. One or more circular rings surround the mandrel and are attached to the mandrel. Reversing the last step in the folding sequence provides access to the internal pocket formed by folding the paper through an aperture in a top flap. At rest the rotatable ring is biased in an original starting position. The zero will hold the bit-line at GND, the bit-line without a cell will have less capacitance and rise faster than the bit-line with the cell due to capacitive mis-match.