SU1402868A1 - Device for checking textile fabric - Google Patents

Abstract

The invention relates to the field of textile engineering. It can be used to control any fabrics, paper, textiles, as well as other materials in related areas of industry. The purpose of the invention is to simplify the design and increase reliability. For this purpose, according to the invention, the device comprises a laser 1, two relatively parallel displaced in the direction of movement of the web of the group of parallelism X between each other translucent mirrors 8, 9 mounted to the plane of the monitored web at an angle of 45, the scanning mechanism of the beam in the plane passing through the semi-transparent mirrors one of the groups, a fixed angle mirror 7, installed in a parallel path of rays behind the first group of semi-transparent mirrors, while the planes of the semi-transparent mirrors of each group are mutually perpendicular. 2 Il. with (Q (L with

Description

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The invention relates to textile engineering and can be used to control any webs, paper, textiles, and other materials in related industries.

Fig. I shows the proposed device, a general view; figure 2 - section in figure 1.

The device contains a laser 1, a collimator 2, reflective flat mirrors 3 and 4, a rotating mirror drum 5, a parabolic reflecting mirror 6, an angular mirror 7, a group of translucent mirrors 8 and a group of semi-transparent mirrors 9 located to the plane of the web, respectively, at an angle of AZ and. 45, The device also contains cylindrical lenses 10 and li and photodetectors, which are connected from light guides 12 with photo receivers 13 fixed at their ends. The photoreceivers are located under the web 14 against the respective mirrors 8 and 9.

The device works as follows.

The luminous flux generated by laser 1 passes through collimator 2 and reflected from mirror 3, hits one of the faces of mirror drum 5 and reflected from it, mirror 4 and parabolic reflecting mirror 6 successively passes through a group of semi-transparent mirrors 8 and falls on an angular mirror 7 .

Reflected from the latter, a stream of light hits a group of translucent mirrors 9. When the radiation energy passes through the semitransparent mirrors-a 8 and 9, part of the light flux from each of them is reflected and, passing through a corresponding cylindrical lens, falls on a textile canvas 14. Control textile fabric 14 across its entire width is carried out by rotating the mirror drum 5. Each of the beams falling on the material being monitored performs a reciprocating movement, with the movement direction s in each group at any given time are mutually opposite. The light fluxes that have passed through the controlled web 14 through the respective cylindrical lenses 11 are directed onto the lateral surface of the respective optical fibers 12.

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and further, propagating along these fibers, they fall on the photodetectors 13. The physical principle of the propagation of light in the fiber is based on the phenomenon of the total internal reflection of the radiation flux at the boundary of two media with different values of the refractive indices.

When producing a defect-free web, the change in the magnitude of the luminous flux reaching the photodetector 13 is due only to the unevenness of the web in terms of density. When a defect appears on the web 14 (for example, in the form of a rarefied column), the luminous flux transmitted through the web increases. At the time of passage through this luminous flux, the output of the corresponding photodetector 13 causes an electrical pulse, which, after appropriate amplification and processing, is used fixing this blemish.

The advantage of the proposed device (in comparison with the known ones) is the simplicity of the alignment of the elements forming the light streams scanning the web, which increases the reliability of the device - (the requirements for the accuracy of manufacturing the mirror drum used in the prototype device are hard in the vertical plane, two parallel beams, and in the proposed device, one beam). Simplification of the alignment in the proposed device is achieved by eliminating concave steps. abolicheskih mirrors used in the prior art device, which should be absolutely identical, since any difference in the curvature of these mirrors dramatically complicates alignment of the entire device as a whole.

Claims (1)

Invention Formula A device for controlling textile fabrics containing a radiation source and a collimator arranged along the radiation, a first reflecting mirror, a mirror drum, a second reflecting mirror, a parabolic mirror, two groups of parallel semi-transparent mirrors that are displaced relative to each other in the plane of movement of the textile web, and a receiving device different The fact that, in order to simplify the design and increase its reliability, the device additionally contains a fixed corner reflector located behind two groups of mirrors This means that the group of mirrors is set so that the reflecting planes of the second group of mirrors are perpendicular to the reflecting planes of the first group of mirrors.  7