Leuze Lumiflex Gmbh & Co., Ltd.

Werner Lehner

Hermann Haberer

Anton Kummert

Paul Haberl

Jörg Velten

The invention relates to an apparatus and a method for monitoring a detection region of a working element (). The apparatus has at least one camera for continuously monitoring the detection region, and an evaluation unit (), into which image information generated by the camera is read. In the evaluation unit (), a comparison of the image information to reference images, and/or a color-feature analysis, allows the detection of endangered objects within at least one protection zone in the detection region. If at least one endangered object is detected inside the protection zone, the evaluation unit () disables the working element (). In contrast, if no endangered object () is located inside the protection zone, the evaluation unit () enables the working element ().

Method for monitoring a detection region of a working element

A photoelectric barrier and operation thereof, the barrier having at least two pairs of transmitters/receivers each operating synchronously. Each of the two transmitters transmits a light signal having a specific identifier, the signal being in the form of a double pulse separated by a pause, which double pulse consists of two pulse groups each separated by a pause, and each receiver then evaluates a light signal of the associated transmitter as correctly received when at least one of the two pulse groups is recognized as valid by means of the associated identifier, in which the duration of the pulse groups and the pauses between them are established so that at most one pulse group of one double pulse of the one transmitter is superimposed with one pulse group of one double pulse of the other transmitter.

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Gröbenzell, Germany

Werner Lehner