Sensor assembly for optically detecting the edges of a product and width-measurement method

A sensor device and optical detection technology, applied in the direction of using optical devices, measuring devices, instruments, etc., can solve the problem of large size

Inactive Publication Date: 2008-03-26
MAHLO
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] This type of sensor in particular has the disadvantage that the edge detection takes place after all mechanically realized operations
Therefore, devices of the first type are, on the one hand, rather bulky and, on the other hand, have to be readjusted to the thickness of the product passing through them

Method used

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  • Sensor assembly for optically detecting the edges of a product and width-measurement method
  • Sensor assembly for optically detecting the edges of a product and width-measurement method
  • Sensor assembly for optically detecting the edges of a product and width-measurement method

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Embodiment Construction

[0031] Figure 1 shows a conventional broadband sensor in a transmissive configuration according to the prior art. The rod-shaped light source 1 , such as a fluorescent lamp, emits light of any wavelength. The light is received by the light-guiding rod 2 and guided to a photosensor not shown in the figure, where it is recorded. The light-tight product 10 partially shades the rod-shaped light source. A light guide device not shown in the figure, such as a movable aperture or a rotating drum with a spiral split aperture, fades the light beam from the light source and moves it in the horizontal direction. The position of the light guide in which the first light signal in the light guide rod is no longer recorded marks the edge position of the product. When the positions of the two edges are known, the product width is correspondingly determined by measuring the difference between the two edge positions in the scale of the sensor device. Such an arrangement requires a precise al...

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Abstract

The present invention relates to a sensor device in the edge of the optic detecting product for measuring the product width especially by confirming the light transmission affected by the product. According to the invention one row of point-shaped light sources which can be separately controlled and is provided with assured position lie at one side of the product and is used coordinately with at least one optical fiber unit, the optical fiber unit extends parallel with the row of light sources and is insulated with the latter in optics, and is optically coupled with the light which is emitted by the light source and is reflected by the product, and at least one photodetector is connected with the optical fiber unit. As the position of each optimized light source is known and the point-shaped light source is controlled successively or selectively, or is controlled with small group, the detecting of the edge can be executed with the following mode. In the control period of the n point-shaped light source the reflecting signal falls on the optical fiber and is transmitted to the photodetector, and the position of the edge of the product conveyor belt can be confirmed as the exclusive assigning of the just now controlled point-shaped light source relative to the respective position. The resolution of the information relative to the product width is confirmed by each smallest unit of the point-shaped light source, the distance between the units or the relationship of the hole.

Description

technical field [0001] The invention relates to a sensor device for optically detecting the edge of a product by determining the light propagation influenced by the product, in particular for measuring the product width, and to a method for measuring the product width by means of such a sensor device. Background technique [0002] Sensor devices of this type are used especially in conjunction with products or product conveyor belts transported in parallel manufacturing and transport systems, in which the position of the products can be precisely detected and, if necessary, corrected. The advantages of optical sensor devices are that they detect the position of the product in a contactless manner, perform data recording quickly and are highly resistant to wear since mechanical contact between sensor and product is avoided. [0003] Particularly broadband sensors and absolute sensors are known in the prior art. A broadband sensor is composed of an elongated geometrically line...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/02B65H23/02B65H7/14G01B11/04
CPCB65H2511/12B65H2701/131B65H2553/414B65H23/0216G01B11/046B65H7/14B65H2511/514B65H2553/416
Inventor 卡尔－海茵茨·施米德尔
Owner MAHLO
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