| 摘要 |
PCT No. PCT/DE91/00212 Sec. 371 Date Jan. 15, 1992 Sec. 102(e) Date Jan. 15, 1992 PCT Filed Mar. 12, 1991 PCT Pub. No. WO91/14997 PCT Pub. Date Oct. 3, 1991.A method and apparatus for detecting superimposed sheets of paper in a sheet fed printing press utilizes cooperating upper and lower transmitter and receiver pairs that are positioned above and below the sheet transport path. Voltages that are representative of the positions of the upper and lower surfaces of the sheet are compared to nominal values. If the actual values significantly exeed the nominal values, a superimposed sheet condition exists and appropriate corrective action can be taken.
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