KR100216140B1 - Process and device for detecting the winding on a rotating roller - Google Patents

Abstract

The present invention relates to a method and apparatus for recognizing thread windings on a rotating roll of a winding device in which a yarn is partially wound, the light source of which is directed along the outer skin of the roll as a light strip and directed to a monitoring area of the roll. An optical sensor with a device is provided. The sensor senses the light reflected from the thread winding unit, which can be further processed after being converted into an electrical signal.

Description

Method and apparatus for recognizing thread winding part on rotary roll

1 shows diagrammatically a tentacle roll arrangement of a package head with a device for winding monitoring.

FIG. 2 is a modification of the apparatus of FIG. 1 with differently arranged optical sensors.

3 shows a beam of light emitted from a light source onto the outer sheath of the roll and the beam of light reflected from the roll in the radial plane of the roll;

* Explanation of symbols for main parts of the drawings

1: roll 2: protrusion ring

3, 4: light source 5: light beam

6-8: Optical sensor 7: Convex lens

12: thread winding unit 15: signal

20: surveillance area 50: ray band

The present invention relates to a method for recognizing thread windings on a rotary roll and an apparatus for implementing the method according to the higher concept of claim 1.

It is known to confirm the diameter of the wound main body, in particular the package diameter of a package of synthetic yarn, by means of a tentacle roll which is arranged hingedly. To this end, the tentacle roll is placed on a wound body and rotates with it. This interferes with the yarns in the tentacle roll area and can thus be wound onto the tentacle rolls. These unwanted windings (= windings) cause drive disturbances. In addition, the driving obstacles may cause damage to the moving device placed in front of the wastehead and cause a large damage to the winding device as the winding of the tentacle roll rapidly increases within a short time.

It has already been proposed to have a tentacle plate tangentially arranged on the tentacle roll to minimize the magnitude of driving disturbances and damage. Since the tentacle roll vibrates, it is essential to have a gap between the tentacle roll and the tentacle plate. To ensure that no false alarms are generated by the tentacle plates under all driving conditions, the voids must be formed correspondingly large. This has the drawback that a large amount of detectable windings must be formed in the tentacle roll so that the tentacle plate sends out an alarm signal.

In connection with this, it has already been proposed to have a light blocking wall arranged in parallel to the tentacle roll of the winding apparatus. When the yarn is wound on the tentacle roll, the amount of light received is changed by the winding portion. If the value is lower than the predetermined value (photocurrent), the alarm signal is sent out.

However, this method did not consider the tentacle roll vibrating. Vibration of the tentacle rolls is caused by radial vibrations caused by the inaccuracy of the circle and pressurization in the curved or spindle. This vibration can also occur due to the clearance of the bearings and the transmission of vibrations and imbalances caused by the spindles in contact.

This method also does not allow any sufficient monitoring of the tentacle rolls and the contact rolls.

Finally, in DE 26 28 994 A1, in relation to threading, an angle of 0 ° to 90 ° from the light source is placed radially at a distance on the roll to monitor the selected longitudinal line of the rotary contact or tentacle roll. It is known to be directed to the surveillance area of the furnace roll and the reflected light is collected by the photosensitive sensor and converted into an electrical signal. Along with this, the density cotton of the polarized light resulting from the reflected light or the wound is measured and analyzed and used to operate the cutting device.

A disadvantage of this known method is that the monitoring area is basically point-shaped and the overall length of the take-up roll can be monitored only at a high technical cost. However, this is necessary, for example, when thread windings are formed on shaft portions that are not monitored simultaneously in the transverse direction of the yarn. It is virtually possible to detect such windings by using several light sources and tracking devices arranged along the roll, or optionally by reciprocating the light sources and photosensitive sensor devices. However, this is a very long system response time and therefore not suitable for monitoring the package speed. Dirt on the roll surface results in poor reflectivity and difficult working point adjustment, thus limiting the function guarantee of known devices.

It is therefore an object of the present invention to provide a stable and reliable method for quickly recognizing unwanted windings in any place of the monitoring area of a rotary roll in a machining machine or a winding machine. In addition, a device capable of recognizing a yarn wound on a roll of such a device with a high functional stability with a short reaction time should be provided.

This object is solved by the features of claim 1 in accordance with the present invention with respect to the method set forth in the claims of claim 1. Advantageous improvements are the subject of claims 2 to 10. A device according to the invention for recognizing yarn wound on a roll of a winding device is the subject of claim 11. Advantageous refinements of the device are the subject matter of claims 12-20.

By the method according to the invention, a new way is provided for recognizing winding up on a rotating roll which is partly wound by progressive yarn. To this end, the light beam from the light source is irradiated onto the roll in such a way that it has an adjustment angle α with respect to the outer skin of the roll and extends as a light band over the entire length of the roll's surveillance area, and the polarized light reflected by the obturator It is proposed that an alarm signal is generated when detected by the sensor device and at least one accident is formed in the surveillance area of the roll. The position of the light sensor is indicated in the claims.

The method is based on the following idea:

The radial vibration of the roll does not have any effect on the sinusoidal by means of an analytical device which is preferably arranged essentially perpendicular to the surveillance area of the roll. Thereby in some cases one accident may already be formed in the roll. However, the placement of light sensors is also possible in other areas. The method of irradiating rolls by incident parallel or broad beams of light is particularly characterized by the fact that the overall surveillance range set between the two normal planes of the rolls arranged at a distance from each other and the adjustment sharpness (α) of the roll shell surface When provided, it provides the advantage of being illuminated by a single light source and a corresponding optical imager. This does not depend on the vibration width of the roll during the winding operation, the manufacturing tolerances during roll production, and the height of the protruding ring of the roll, which is provided in some cases. This adjustment angle α is in the range of 3 ° to 10 °, preferably about 5 °, and in each case is set experimentally depending on the structural state. While the detection of the windings takes place simultaneously in the entire surveillance area, accurate detection is possible only by continuous measurement in the prior art. The identification of the yarn is performed by reflecting light of a yarn made of several filaments and causing a flash on the roll of the winding device. This flash is recognized by the analyzer as polarized light and a signal is output there. Irradiation of the entire monitoring area of the tentacle roll by the incident light beam ensures that the flash of yarn occurs once only one or two windings are formed, which reflects only the minute light in the direction of the optical sensor and thus the polarized light This is because it is recognized as a deviation from the basic light which exists in some cases.

Preferably the light is monochrome. The roll may for example be irradiated with a laser light source. This is not necessarily necessary, but in some cases it provides the advantage of installing the necessary lens apparatus of the optical camera, since the monochromatic light has a certain wavelength and only the correction of the lens should be considered for this constant wavelength. In addition, interference caused by external influences of daylight or ambient light can be simply blocked by the filter. Preferably the laser light source has a good potential in cost by providing a narrowly defined monochromatic light beam. Electron laser light sources that operate in the wavelength range of the infrared ray base are preferred in the present invention.

Known rolls of the four winding apparatus have a plurality of protruding rings formed at an axial distance from each other to control a speed ratio suitable for sagging or intermotion during package replacement. In order to ensure that no unirradiated area is present near the protruding ring, and that the thread formed in the shadow of the protruding ring is also detected equally, the roll according to claim 6 is basically in one plane in the axial direction in accordance with claim It is proposed that two opposing light sources spaced apart can be irradiated and thus irradiated to the entire surveillance area-right next to the protruding ring. To this end, a sensor arrangement according to claim 6 and preferably claim 8 is shown.

It is noted that the roll may be a sand feed roll or a sand outlet roll (Godette). Preferably, however, this is a contact roll or tentacle roll of such a winding machine of a spinning machine, the basic structure of which is known, for example, from US Pat. No. 5,029,762 A.

A device with an optoelectronic device (optical sensor) is proposed for recognizing the winding portion in a rotary roll of a four winding device, which is basically in a windy embodiment with a distance from the roll side in the center of the monitoring area. And an analysis device arranged to output a signal without being wound by the yarns. The optoelectronic device is preferably electrically connected with the analyzer.

The light (polarization) reflected from the winding part of the rotating roll is detected by the optoelectronic device, and is preferably converted into a standard electric signal supplied to the analysis device, where the analysis device generates an additional signal when it exceeds the tolerance limit. Contribution, this may be an alarm signal or a signal for a cut.

In particular, the apparatus has a light source disposed outside the surveillance area, which emits a beam of light in the longitudinal direction of the roll and with a small adjustment angle to the roll. The light source preferably irradiates monochromatic light, such as light of a laser light source. This can be for example a square cross section or a light beam adapted to the surveillance area and extended by suitable optics.

The optoelectronic device preferably comprises an optical imager with an optical sensor disposed behind the convex lens. Here, the photosensor may be a CCD array or a photodiode.

Using a sensor in the form of a CCD array has the advantage that it can be exported in response to a periodic signal. By recognizing the axial position of the protruding ring on the rolls, in particular the tentacle rolls of the four winding apparatus, the measurand (deflection reflection) of the optical sensor from this area can be easily removed by the digital logic. Electronics allow fast response with millisecond errors.

Additional advantages and features of the method and apparatus are described by way of example.

For example, several protruding rings 2 are formed on a shaft or tentacle roll 1 having a diameter of 85 mm. This comes in contact after package exchange with a package bush coupled to a clamping chuck spindle, not shown.

The tentacle roll 1 is irradiated by two light sources 3 and 4 disposed to face each other at a distance from the tentacle roll and placed in a radial plane. The adjustment angle α of the light beam or radiation beam 5 incident on the tentacle roll 1 is irradiated by each side region of the surveillance region of the roll 1 facing the optoelectronic device (light sensor) 6 to 8. It is chosen to be an acute angle. The light sources 3 and 4 irradiate a light beam 5 having a width of about 10 mm and a depth of several mm, preferably 1 mm and a square cross section. This is obtained for example by an unillustrated collimation optic with a cylindrical lens. The light beams 5 are irradiated on the rolls as very narrow light bands 50 respectively traveling along the outer sheath in a straight line or in the circumferential direction of the rolls in the monitoring region of the roll 1. The light sources 3 and 4 are arranged on the outer side surface of the surveillance region 20 in order to irradiate the entire surveillance region 20 formed between the two normal faces of the rolls 1 spaced apart.

The optoelectronic device (optical sensor) 6 to 8 spaced apart from the tentacle roll 1 essentially in the direction perpendicular to the axis of rotation of the tentacle roll 1 is basically the upper portion of the monitoring area 20 of the roll 1. The device is equipped with a convex lens 7 followed by an optical sensor 8. The optical sensor 8 is composed of a photodiode which transforms the dropped light into a photocurrent l5. In front of the optical sensor 8 is a blocking wall 9 for removing the area of the protruding ring 2.

The optical sensor 8 is electrically connected to the analysis device 10, which is electrically connected to the alarm notification device 11.

For example, the saga tentacle roll 1, which proceeds at a speed of 8000 m / min, is wound to form a winding portion 12, which reflects light emitted from the light sources 3 and 4. Moreover, the light rays of the light beams 5 are refracted at the fine yarns of the filaments. The reflected light 13 is directed to the optical sensor 8 through the convex lens 7. The optical sensor passes the signal 15 to the analyzer 10 and this signal is compared with the signal R corresponding to an uninterrupted state. The analyzer sends out an alarm signal when the comparison indicates a deviation greater than the tolerance.

According to the present invention, it is possible to inform in advance even after a slight winding of the saga tentacle roll 1 over the entire length of the monitoring area 20, in particular, so that the yarn can be released before causing damage to the winding machine. .

A very short reaction time is achieved by the photodiode. Microsecond response time is feasible. The actual reaction time depends on the amount of light reflected from the obturator 12. Therefore, the adjustment angle α and the width of the light beam 5 in the roll 1 direction should be as small as possible, for example, 5 ° or smaller and narrower than 1 mm.

The maximum response time by a CCD sensor composed of 1024 pixels and processed at a vibration frequency of 15 MHz is expected to be 70 microseconds.

Possible sensor response times are certainly under 2 milliseconds. This reaction time is sufficient to avoid dangerous damage to the components of the winding device for winding speeds of 8000 m / min and 85 mm blade roll diameters.

FIG. 2 shows a modified device for the winding monitoring of FIG. Here, imaging is performed by the transparent light beam 5 which is incident from the light source 3 to the tentacle roll 1 not shown here by an optical device having lenses 16 and 17. The reflected light 13 is refracted by the convex surface of the lens 17 and is depicted and detected by the optoelectronic analysis device (optical sensor) 7 to 8 which lies in the beam path of the reflected light beam 13 and the photocurrent It is transformed into 15. This is compared with the signal R corresponding to the photocurrent 15 with the light density supplied to the analyzer 10 as shown in FIG. 1 and reflected therein, for example, without twisting the tentacle roll 1. do. If the signal difference is amplified in the analysis device 10 and exceeds a predetermined threshold, the alarm device 11 may be activated.

The advantage of the installation according to FIG. 2 is that the light source 3 (transmitter), the light sensors 7 and 8 (receiver) and the intermediate are not attached because the monitoring device of any member is not attached immediately adjacent to the tentacle roll 1 to be monitored. For optics placed on, the structure can be more free.

However, when there are two light sources-to illuminate the entire surveillance area and to avoid shadows next to the protruding ring-both light sources (3, 4) are directly incident on the optical sensor placed opposite the light reflected from the tentacle roll surface. It should be noted that they should be placed in parallel planes which are offset from each other in order not to be prevented.

Finally, FIG. 3 diagrammatically shows the position of the light source 3 for the roll 1, which in this case is outside the monitoring area of the roll in the radial plane of the roll 1 without any protruding ring. It also shows that the photosensors 6 to 8 are attached to detect the light generated by the winding unit 12, which may be formed in the surveillance area 20. Such light is generated by the reflection, refraction and bending of the light beam 5 irradiated onto the fine filament yarn (fine yarn) of the opaque thread winding portion that is opaque. In the installation of FIG. 3, the photosensors 6 to 8 are arranged on the roll 1, ie on the roll 1 side on the tangential plane of the roll 1 on which the light band 50 is formed. The areas of the light beam 5 directed from the light source to the roll 1 and the areas of the light beam 25 reflected from the roll 1, shown by hatching in the figures, are an exception. In the angularly shifted plane the photosensors 6 to 8 can be placed anywhere.

The light sensors 6 to 8 should measure the light rays generated from the yarns or thread windings, not the light beams reflected from the roll 1 itself, and should ensure that a clear light density difference is observed as a deviation of the light current.

Claims (20)

In the method for recognizing the winding portion 12 in the strand which continuously advances across the rotary roll 1, the beam of light 5 from the light sources 3, 4 is applied to the surface of the rotary roll 1. Irradiating in an axial direction as a whole and at an acute angle with respect to the surface of the rotating roll, wherein the light beam 5 is rotated on the surface of the rotating roll 1 not wound by the traveling yarn strands. 1) having a cross-sectional area that forms a surveillance area consisting of a narrow band of rays 50 extending axially along a surface portion, wherein the beam of light 5 is reflected at the surveillance area along a predetermined path, and rotates And detecting the scattered light scattered by the thread forming portion formed on the roll (1) with a light sensor (6) located outside the predetermined path of the light source beam (5) and the reflected light. Method according to claim 1, characterized in that the light strip (50) has a width of 5 mm or less, preferably 2 mm or less. Method according to claim 1, characterized in that the light beam (5) is directed to the roll (1) with an adjustment angle α of 3 to 8 °, preferably about 5 °. 2. Method according to claim 1, characterized in that the axis (1) is irradiated with monochromatic light. 5. Method according to claim 4, characterized in that the light beam (5) is light of a laser light source. The roll 1 is basically provided by the two light sources 3, 4 facing each other with the beam of light 5. Is irradiated to be formed in the surveillance region 20, and the light sensors 6 to 8 are directed from the light sources 3 and 4 toward the surveillance region 20 of the roll 1 and reflected from the roll 1. Method, characterized in that it is arranged outside the beam (5). The method according to claim 1, wherein the roll (1) is a tentacle roll of a four winding apparatus for infinite synthetic yarn. 2. Method according to claim 1, characterized in that the photosensors (6 to 8) are basically arranged above the center of the surveillance area of the roll (1) for detecting the light reflected from the obturator (12). The light sensor (6) according to claim 1, characterized in that the optical sensors (6 to 8) are arranged on an irradiation path parallel to the light source (3) irradiating the light rays (5) to detect the light reflected from the threading unit (12). How to. 2. Method according to claim 1, characterized in that the light received by the light sensors (6 to 8) is detected as an electrical signal (15) and the change is amplified to give an alarm signal. In order to carry out the method according to claims 1 to 10, the light sources 3 and 4 for illuminating the roll 1 in the surveillance area and the optical sensors 6 to 8 for detecting the light reflected from the surveillance area. In the apparatus for recognizing the winding portion 12 (winding portion) in the rotary roll 1 of the sand processing apparatus or the winding machine, the light sources 3 and 4 have an adjustment angle α and a roll ( Heading over the surveillance zone 20 of 1), the beam zone 50 is depicted along the sheath line of the roll 1 in the surveillance zone to cover the length of the surveillance zone, and the photosensors 6 to 8, A device, characterized in that it is arranged outside the light beam (5) from the light source (3, 4) towards the surveillance area (20) of the roll (1) and reflected from the roll (1). 12. The apparatus according to claim 11, wherein the angle of adjustment (α) of the light source (3) with respect to the axis of rotation of the roll (1) is 3 to 10 degrees, preferably about 5 degrees. 12. The device according to claim 11, wherein the roll (1) is illuminated by monochromatic light emitted from the light source (3), preferably from a laser light source. 12. The light source band (50) according to claim 11, wherein the two light sources (3, 4) are directed to the monitoring area (20) of the roll (1) with an adjustment angle (α) so that the entire light band (50) is basically monitored by the roll (1). Depicted in the area 20 to cover the length of the monitoring area 20, and the photosensors 6-8 are directed from the positive light sources 3, 4 towards the monitoring area 20 of the roll 1 Apparatus characterized in that they are disposed outside of the light beam (5) reflected from 1). Device according to claim 11, characterized in that the photosensors (6 to 8) have convex lenses (7) arranged in the light path of the light beam (5) reflected by the obturator (12). 12. The device according to claim 11, wherein the optical sensor (8) has a CCD array. Device according to claim 11, characterized in that the optical sensor (8) comprises a photodiode. The light path between the convex lens 7 and the optical sensor 8 according to any one of claims 12 to 17, wherein the rolls 1 have a plurality of protruding rings 2 spaced apart in the axial direction. Device, characterized in that the barrier wall (9) is arranged. 12. The apparatus according to claim 11, wherein the roll (1) is a tentacle roll (1) of a four winding device or a yarn feed goth of a synthetic spinning machine. 12. The device according to claim 11, characterized in that the photosensors (6 to 8) are arranged in a plane parallel to the plane in which the light source (3) is directed which directs the light beam (5) to the roll (1).