DE489318C - Automatic device for sorting objects according to their color - Google Patents

Description

Automatic device for sorting objects according to their Color There are already sorting devices such. B. for coffee beans, cereals as well as rocks and the like, known, in which a sorting according to the color and Reflectivity using electrical, light-sensitive organs (Selentials, photocells or the like) takes place. It was also suggested that in such sorting devices in the one leading to the photosensitive organ Switch on the optical path filter in order to test the sorting body in certain To be able to make spectral ranges.

The invention relates to the development of such a sorting device, in which the accuracy of their work is significantly increased by the fact that they Use of more precisely determinable spectral ranges enables than this alone can be reached through filters. It is well known that filters never cut perfectly from, so that it is not possible with their help z. B. individual wavelengths sifting out the spectrum of an incandescent lamp. The invention, however, makes it possible Work. with such narrowly limited wavelength ranges. The inventive Sorting device is characterized in that a Luminescence emitters, e.g. B. So a metal vapor arc lamp is provided. Such As is well known, lamps do not emit a continuous spectrum, but a light spectrum, in which the individual lines are often separated by considerable spaces are separated. From such a line spectrum one can use. Filter simply hide individual lines or groups of lines so that, then click on the electrical light-sensitive organ has an extremely sharply delimited wavelength region comes into effect. As a result, even very small intensity shifts occur. With the passage or reflection spectrum of the sorting body, there are considerable current fluctuations in the circuit of the electrical photosensitive organ emerges, so that the control the sorting device is greatly facilitated.

At which point the filters or filter combinations, which for Screening of the individual spectral ranges are used, switched into the beam path is in itself indifferent. You can just as easily see it right in front of the light source as above the items to be sorted or immediately in front of the electrical photosensitive Order organ. In one case, for example, disruptive photochemical changes are avoided on the bodies to be sorted, in the other case you protect what is usually a bit sensitive Filters against the same influences or against excessive heating. In many cases it is useful the filter light-tight immediately in front of the electrical light-sensitive organ to arrange to avoid interference from secondary lights, 'z. B: diffuse daylight, if possible to avoid..

Claims (1)

PATENT CLAIM: Automatic device for sorting objects according to their color with the help of electrical photosensitive organs and in the Filters switched on in the beam path, which mask individual spectral areas, characterized in that, for illuminating the objects .a luminescent radiator, z. B. a metal vapor arc lamp is provided, from the spectrum of which the filter Sieve out individual lines or groups of lines so that -to the electrical light-sensitive Organ only has a sharply delimited wavelength range.