SU1733922A2 - Device for continuous non-contact checking of transverse dimensions of fibrous products - Google Patents

Abstract

The invention relates to a measurement technique, in particular, to devices for continuous non-contact control of the transverse dimensions of thread-like articles, and is an improvement of the known device according to the author. No. 1464039. The purpose of the invention is to improve the accuracy and performance of the control by eliminating the need to separate and then align the ends of the movable parts of the light guide when introducing the thread-like product into the control zone. The light beams 6 from the light source 1 due to multiple reflections from the walls of the light guide 2 illuminate the thread-like product 7 from almost all sides. The modulated light beams along the receiving section of the light guide 2 arrive at the input of the photodetector 4, where their intensity is recorded. The total intensity is inversely proportional to the cross section of the filament, 1 sludge. W fe

Description

The invention relates to a measurement technique, in particular, to devices for continuous non-contact control of the transverse dimensions of thread-like articles, and is an improvement of the known device according to the author. No. 1464039.

The known device contains consistently installed light source 1, the light guide 2 with a through channel 3 and the photodetector 4,

A disadvantage of the known device lies in its inconvenience of control and low reliability, due to the need for separation and subsequent alignment of the ends of the movable parts of the optical fibers. Inaccurate alignment of the ends of the movable parts of the optical fibers leads to dispersion of part of the light flux and, as a result, to a decrease in accuracy.

The purpose of the invention is to improve the accuracy and productivity of control by eliminating the need for disconnection and subsequent alignment of the ends of the movable parts of the light guide when introducing a thread-like product into the control zone.

The drawing shows a block diagram of the device.

The device contains successively installed light source 1, light guide 2, made in the form of a V-shaped form with a through channel 3, formed by a slit covering the curvilinear section of the light guide 2, photodetector 4, light-absorbing screen 5.

The device operates as follows.

The light beams 6 from the light source 1 arrive at the input of the light guide 2 at different angles and due to multiple reflection

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from the walls, a through channel 3 is reached, in which there is a filament article 7, passing through the control zone 8 and absorbing (holding back) a part of the light beams 6.

The degree of absorption of the light beams is proportional to the size of the transverse size (thickness) of the thread-like product 7, while as the light beams 6 pass through zone 8 of the control at different angles, the thread-like product 7 is viewed almost from all sides, therefore, after the control zone 8, the light beams 6 modulated in such a way that they carry information about the projections of the transverse size of the thread-like article 7 in all planes.

After the control zone 8 formed by the light-transmitting section of the light-reflecting layer 9, the modulated light beams 6 are fed through the light-guide 2 to the input of the photo-receiver 4, where their intensity is summed up and fixed. The total intensity is inversely proportional to the cross section of the thread-like product.

A light transmitting screen 5 protects the photodetector 4 from direct light from the source 1 of light on the photodetector 4.

The implementation of the light guide 2 in the form of a V-shaped shape with the through channel 3 in the form of a slit covering the curvilinear part of the light guide 2 allows free insertion of the thread-like product 7 into the control zone 8, and the implementation of the light guide 2 is inseparable, which eliminates the need for separation and subsequent alignment the ends of the movable parts of the fiber, and the coating of the slit walls with a light-reflecting layer 9 with a light-transmitting section in the control zone 3 significantly increase the accuracy and performance of the control.

Claims (1)

The invention The device for the continuous. Non-contact control of the transverse dimensions of the thread-like products according to the author. No. 1464039, characterized in that, in order to improve the accuracy and performance of the control, it is provided with a screen mounted between the light source and the photoreceiver, the light guide is made of a V-shaped shape with a slit from the side of the curved section of the optical fiber to the through channel, and the walls of the slit are made reflective.