Method of processing documents moving along a transport path of a document processing system and an apparatus therefor

摘要

An apparatus is provided for processing items moving along a transport path of a document processing system. The apparatus comprises a number of light sources located on one side of the transport path. A number of light sensors is located on the other side of the transport path and is provided for (i) sensing light from the light source transmitted through a variable first location of at least one item moving along the transport path and providing a first sensor output signal indicative of the extent of light transmitted, and (ii) sensing light from the light sources transmitted through a redefined second location of the at least one item moving along the transport path and providing a second sensor output signal indicative of the extent of light transmitted. A processing unit is responsive to the first and second sensor output signals and is provided for producing a first control signal indicative of a double-item feed condition when the first sensor output signal is indicative of transmitted light being below a first predetermined value and the second sensor output signal is indicative of transmitted light being below a second predetermined value. The processing unit produces a second control signal indicative of a false double-item feed condition when the first sensor output signal is indicative of transmitted light being below the first predetermined value and the second sensor output is indicative of transmitted light being above the second predetermined value.