Device for controlling and/or measuring parameters of moving products having the form of a thread or wire

 

(57) Abstract:

The invention concerns a device for monitoring and/or measuring parameters of moving products having the form of a thread or wire. Set according to two electrodes of the capacitive measuring body, executed in the form of a lattice or mesh embedded in the appropriate disks, or in the form of a film layer made of a material that is transparent to the optical body, and accordingly the light source and the photoelectric element in a single casing and on opposite sides of the product, so that the electrodes are located along the beam of the light source optical measuring body, placed at a distance of capacitive sequentially along the direction of movement of the product. If the thread passing through the measuring gap has a changing cross-section, which is a consequence of a defect of the yarn, for example a consequence of thickening or thinning, it changes the shading of the photodiode and, therefore, its output signal. With this change, the output singal of the photodiode can now either just to register the location of the defect as such, or you can stop moving the thread and fix the defect. The signals of the two measuring bodies so arr is extraneous fibers, torsion, specific weight, etc., and the simultaneous use of the two measuring bodies increases the accuracy of the measurement, fluctuations in the accuracy of both systems mutually at least partially eliminated. 8 C.p. f-crystals, 3 ill.

The invention concerns a device for monitoring and/or measuring parameters of moving products having the form of a filament or wire containing capacitive measuring body comprised of two electrodes placed on opposite sides of the product.

These devices, based on the capacitive measuring principle, it is now very common, namely on the one hand as electronic meteocontrol, and on the other hand as a device to determine uniformity. Electronic meteocontrol are used to detect disturbing yarn defects, such as short thickening, thinning and frequent thickening-thinning (moiré). Device for determining the uniformity serve for the detection and analysis of oscillations of the weight per unit length of the tape, runic and yarn.

Known measuring head with capacitive measuring bodies used in known electronic videocasettes (U.S. Patent N 2516768 and N 3009101.

Capacitive izmeritelnoi received very widespread. Along with devices based on this principle shall also be applied optical measuring head, which is determined by the diameter of the test material (European patent application EP-A-244788).

Optical heads are used when a capacitive measuring head can not be used.

So, for example, is the case in the study of electrically conductive yarns.

Regardless of the type measuring principle the measuring head have a fundamentally and structurally due to the dependence on extraneous influences, such as humidity, the cross-sectional shape of the yarn, the dependence on position, influence, material, etc. that cannot be eliminated or reduced with the help of this technology, although there is a great interest. Another still unsolved problem is applicable for all types of yarns universal measuring head with all the advantages of the capacitive measuring principle. Finally, given the progressive automation it would also be desirable if the disposal had the measuring cylinder, self-controlling type.

The basis of the invention is, what AE known measuring heads, and would be universally applicable and self.

This task is solved according to the invention due to the fact that in addition to the capacitive measuring body is provided an optical measuring body with a light source and a photoelectric element mounted on different sides of the product, both measuring body accommodated in the housing and is made with adjustable sensitivity.

According to a preferred exemplary embodiment provides that the measuring elements installed in series one after another along the direction of movement of the product at a distance from one another, both of the body in the form of a uniform design with a partially overlapped area measurement.

In addition, provided that the electrodes are located along the beam of the light source.

According to the following exemplary embodiment of the invention provides that the optical measuring body made with the scattering elements in the form of discs, and the electrodes are bonded respectively with the disks.

It also provides that each electrode is made in the form of a lattice or mesh embedded in the appropriate drive or printed on this at all for the optical body.

As the material for the first film layer may be a metal deposited from the vapor phase or deposited, and the film layer can be made of conductive synthetic material, deposited on the disk.

Thus, corresponding to the invention, the measuring head has a number of distinctive properties, and in particular makes possible the measurement and monitoring of measured values, which still could not be measured by a known measuring heads, whether capacitive or optical.

In Fig. 1 schematically shows a first embodiment of the proposed device (the plane of the section is orthogonal to the direction of movement of the thread), and Fig. 2 - the same, the second embodiment of the device of Fig.3 - the third embodiment of the device (the plane of the section is in the plane of motion of the thread and transversely to the measuring slit device).

Presented on figures from the device are used to control and/or measurement of parameters of moving threads, in particular for optical and capacitive registration of their diameter and cross section. These devices are designated as the measuring head, are one body 1 with the measuring malual type of thread or yarn or textile tape down to the wire.

The body 1 integrally made by injection molding, has the shape of a box with an open bottom. Excavation for the measuring gap 2 is divided into two halves 3 and 4. Open Cabinet base is inserted and screwed to the body 1 of the support plate 5 for optical and electronic parts of the device.

On the base plate 5 in half 3 of the housing is a light source 6, preferably a light diode that emits light to the photodiode 7, located at half 4 of the housing. The measuring gap 2 is closed the scattering disk 8 from the light diode 6 and the scattering disk 9 from the photodiode 7, resulting in the measuring gap 2 there is a diffuse lighting, which also falls as diffuse light on the photodiode 7. The scattering disk 9 in front of the photodiode 7 can also be designed as a filter disk for shielding from ambient light or it can serve as scattering and as the filter disk.

If the thread F, passing through the measuring gap 2 has a changing cross-section, which is a consequence of a defect of the yarn, for example a consequence of thickening or thinning, it changes the shading of the photodiode 7 and, consequently, its output signal. With this treason is but stop moving the thread F and fix the defect.

To ensure a homogeneous field lighting in the measuring gap 2 between the led 6 and the scattering disk 8 is provided with the aperture 10 (Fig.1) or the light guide 11 in the form of a truncated cone with a recess 12 (Fig.2 and 3).

In addition to the described optical measuring body is provided capacitive measuring body, which may be differently located relative to the optical measuring body.

Capacitive measuring body symbolically represented by two capacitor plates 13 and 14. In Fig.1 and 2 shows one device, the measuring zone of the optical and capacitive measuring body are the same; in the case of execution according to Fig.3 these measurement areas are located next to each other.

According Fig.1, each of the capacitor plates 13 and 14 formed from one embedded in the scattering disks 8 and 9 electrically conductive and transparent to optical measuring head with a layer of metal or plastic. Each of the scattering disk can be performed sandwichery and the specified layer can be applied to one part by vapour deposition or by sputtering. The layers forming the capacitor plates 13 and 14 made with the Oia according to Fig. 2 layers forming the capacitor plates 13, 14, not embedded in the scattering disks 8 and 9, and the scattering disks covered with a layer on one side that can be rotated to the filament F, and can be turned from it.

In Fig. 3 shows an embodiment of the device, when in the optical and capacitive measuring elements have no common measurement zone and spatially separated measurement areas. The measuring chamber and thus also measuring elements are arranged one behind another in the direction of the threads. In this case, both the measuring body completely independent from each other.

Using the measuring head shown in Fig.3, capacitive and optical measurements occur at the same time not one and the same element thread and the adjacent elements of the thread, however, this difference between the signals of the two measurements can be compensated in the signal processing. Payment can be made that the signals of the latter in the direction of movement of the thread of the measuring body measurement zone which each part of the thread F is earlier than in the measurement zone of the front in the direction of the threads of the measuring body, respectively samedit interference, so no need to compensate for this difference.

Both measuring systems, capacitive and optical, as a rule, will have different sensitivity, they must be agreed upon at the same sensitivity. This preferably occurs automatically before starting the measurement, namely by correlation or similar method with a static signal component or without it.

To generate a more accurate total signal preferably are averaged both the measuring signal, namely, after performing the signal conversion and filtering in the time and frequency range to suppress respectively unfavorable foreign influences. At the insertion of the filament is adjusted zero point two measuring bodies. The drift is corrected more stable measuring body, and strengthening in cases where the humidity can vary, given the optical measuring body. Non-uniformity of the moving filament F, such as thickening, thinning, etc. are determined by averaging the signals of the two measuring bodies. The definition of nodules is based on the optical signals of the measuring body by filtering in vreme, and the difference between the two measuring signals after selective amplification of extraneous influences.

Using the two measuring bodies also makes it possible to control the measuring head by comparing the separate filtered signal components and check for plausibility. If a single component or combination of such components detects unusual deviation, then the conclusion is made about the faulty working of the measuring body and switches on the measuring body with the presumed correct measured value. Under certain conditions, can also be switched only distorted signal component or may be filed with alarm.

The signals of the two measuring bodies can be processed so that the possible readings of other measured quantities, such as volume, hairiness, moisture, extraneous fibers, twisting, specific gravity, etc.

Through the simultaneous use of both types of measuring bodies increases the accuracy of the measurement, fluctuations in the accuracy of both systems mutually at least partially eliminated.

1. DEVICE FOR CONTROLLING AND/OR MEASURING THE, kiuchumi two electrodes placed on opposite sides of the product, characterized in that it is provided with an optical measuring body including a light source and a photoelectric element mounted on different sides of the product, and the housing, both the measuring body accommodated in the housing and is made with adjustable sensitivity.

2. The device under item 1, characterized in that the measuring elements installed in series one after another along the direction of movement of the product at a distance from one another.

3. The device under item 1, characterized in that both of the body in the form of a uniform design with a partially overlapped area measurement.

4. The device according to p. 3, characterized in that the electrodes are located along the beam of the light source.

5. The device according to p. 4, characterized in that the optical measuring body made with the scattering elements in the form of discs, and the electrodes are bonded respectively with the disks.

6. The device under item 5, characterized in that each electrode is made in the form of a lattice or mesh embedded in the appropriate drive or applied thereto.

7. The device according to p. 6, characterized in that each electrode vypolnyayutsya fact, what film layer is made of a metal deposited from the vapor phase or sprayed.

9. The device according to p. 7, wherein the film layer is made of a conductive synthetic material, deposited on the disk.

 

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