| 摘要 |
A method and apparatus for the detection of an edge of an object, with at least two photoelectric barriers, having at least one sender and at least one receiver apparatus as well as at least one common evaluation electronic unit for the detection of the edge or the presence of the object found on a transparent transporting belt. A diaphragm apparatus creates specially shaped light beam cross sections, wherein at least one light beam (B) is irradiated as a sufficiently narrow slit (5) in the direction of the edge to be detected, wherein the signals of the photoelectric barriers (3,4,10,11,12,13,14) are logically interconnected in the common evaluation unit (8).
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