| 摘要 |
The sheet collator comprises a plurality of sheet loading pockets each associated with a sheet ejector for ejecting single sheets into a common sheet conveyor path from the respective pocket. A photo-electric, e.g. infrared sheet passage detector is mounted between each pocket and the common sheet conveyor path. In an initial set-up cycle, upon the passage of an ejected sheet, the detector will take eight samples of the transparency or reflectivity of the passing sheet of paper. These samples are averaged to generate a detection signal representative of the transparency or reflectivity of the sheet of paper. The detection signal is stored. In operation, it is compared with the detection signals generated during subsequent sheet passages. When the compared detection signals are not the same, an alarm signal will be generated and used to stop the operation of the collator at the end of a completed collating cycle. The detection signals are analyzed to discriminate between missing sheet and multiple sheet conditions. |
