JP6747798B2 - Device for recognizing residual yarn in a spinning cup winding tube arranged in a standing state - Google Patents

Description

The present invention has a light source for irradiating a spinning cup winding tube with light, an imaging device for creating a digital image of the spinning cup winding tube, and an evaluation device for evaluating the digital image for recognizing residual yarn. The present invention relates to a device for recognizing a residual yarn in a winding tube. The present invention further relates to a conveying system for a spinning cup and a spinning cup winding tube, the conveying system including a spinning cup and a conveying element for conveying the spinning cup winding tube in an upright state, and a residue in the discharged spinning cup winding tube. A winding machine with a corresponding device for recognizing the yarn.

On a ring spinning machine, spinning cups with a relatively small amount of yarn are produced. These spinning cups are rewound in a winding machine into a twill winding package having a large volume. The winder can have a transport system for the spinning cup and the spinning cup winding tube. The transport system automates the spinning cup and supplies it to the individual winding units of the winding machine. The spinning cup is conveyed in an upright state, that is, in a vertical state, corresponding to the feeding position in the winding unit. The spinning cup is arranged on the conveying element. Such a transport element may be formed, for example, as a transport tray with a spinning cup or an upstanding mandrel for a spinning cup tube. The transport tray can be transported using a conveyor belt inside the spinning machine. The empty spinning cup tube is likewise automated after the thread has been unwound and is unloaded again from the transport system. Empty spinning cup windings can be used in ring spinning machines to produce new spinning cups. However, the spinning cup may not be completely paid out in the winding unit, and residual yarn may remain in the spinning cup winding tube. Therefore, the discharged spinning cup tube is inspected for residual yarn. The processing of the spinning cup winding is performed in relation to the detected residual yarn. If the residual yarn is still available, the spun cup tube is handed over to the cup preparation device and newly fed to the winding unit. If the residual yarn is unusable, the spinning cup reel is fed to the reel cleaning device before being used again in the ring spinning machine. Otherwise, the residual yarn will cause problems during the spinning process and during cup formation.

Patent Document 1 discloses an apparatus for recognizing residual yarn in a spinning cup winding tube. In this known arrangement, the residual yarn is detected by digital image processing. At this time, known methods for image processing and edge filter processing are used. Illumination of the spinning cup winding tube is performed by diffused light using a light source. In other words, this known arrangement intentionally uses light emitted in all directions.

However, it has been found that such a device does not always ensure reliable recognition of the small residual yarns that cause problems, especially in the subsequent spinning process.

German Patent Application Publication No. 19836071

An object of the present invention is therefore to improve the degree of recognition of residual yarn in a spinning cup winding tube.

This problem is solved according to the invention by a device with the characterizing features of claim 1 and by a winder with the characterizing features of claim 15. Preferred aspects of the invention are described in the dependent claims.

According to the present invention, the light source for illuminating the spinning cup winding tube emits bundled light, and the optical axis of the light source forms an angle of 2° to 8° with the axis of the spinning cup winding tube. doing.

When the diffused light is applied, similar light collides with the spinning cup winding tube and the residual yarn. Due to the fact that the area of the spinning cup tube is significantly larger than that of the residual yarn, a correspondingly more light is reflected from the spinning cup tube than the light from the residual yarn. This makes it almost impossible to distinguish the residual yarn from the spun cup tube in the digital image of the spun cup tube. It is therefore proposed according to the invention to use a bundled light (gebuendeltes Licht). That is, the light is limited to a particular directional range. By arranging the optical axis of the light source at a predetermined angle with respect to the axis of the spinning cup winding tube, more light can be reflected in the residual yarn than in the spinning cup winding tube. This causes the residual yarn to stand out more clearly in the digital image than in the spinning cup tube. Increasing the angle further is counterproductive. This means that more light will be reflected again in the tube. At smaller angles, in a structured winding tube, the structure may cause the residual yarn to shade, or the residual yarn further away from the light source to shade the residual yarn located closer to the light source. As a result, the residual thread is completely or partially not recognized.

Corresponding to the known conveying devices in the winding machine, the spinning cup tube is preferably positioned in the standing position in the device for recognizing residual yarn. In this case, the light source is preferably arranged above the spinning cup tube. With this construction, on the one hand, the residual yarns in the entire spinning cup winding tube can be recognized, and on the other hand, the risk of contact between the light source and the spinning cup winding tube is eliminated. If the light source is arranged at a relatively low position, a small angle between the optical axis of the light source and the axis of the spinning cup winding will cause an immediate collision between the light source and the spinning cup winding.

A light source having substantially collimated light allows the entire light to have an optimum angle with respect to the axis of the spinning cup tube. Such a light source has, for example, a collimator which can be formed as an LED with one lens. However, it is clear that a real light source can never produce exactly parallel light.

Therefore, according to a preferred aspect, the light source has an irradiation angle of 7° or less. At irradiation angles up to 7°, sufficient parallelism of the light rays is provided.

According to another preferred aspect, the light source comprises a plurality of partial light sources. For example, the light source may consist of three LEDs, each with one unique lens. With a plurality of partial light sources, it is possible to increase the irradiation area of the light source, and thus to improve the illumination of the spinning cup winding tube without increasing the irradiation angle and thus degrading the parallelism.

Preferably, the optical axis of the imaging device forms an angle of 30° to 50° with the axis of the spinning cup winding tube. In this angular range, the largest part of the ray that strikes the residual yarn is reflected.

The axis of the spinning cup winding tube, the optical axis of the light source, and the optical axis of the imaging device are preferably located on one plane.

The imaging device has at least one objective lens and an imaging sensor. The imaging device can be formed as a camera, for example.

The evaluation device preferably comprises means for fixing the evaluation window inside the outer contour of the spinning cup tube, which evaluation window is adapted to be evaluated for residual yarn. Fixing the evaluation window simplifies the detection of residual yarn. At the time of evaluation, it can additionally be taken into account that the residual thread is always formed as a peripheral thread. Other configurations of residual yarns do not occur due to the winding composition of the spinning cup (Wickelschema), or at least they are not problematic for further processing. The outer contour of the spinning cup winding tube can be made clear by a known edge filter process.

The means for fixing the evaluation window are preferably formed such that the evaluation window in the spinning cup tube is oriented when the evaluation window is fixed. As a result, a deviation angle between the evaluation window and the spinning cup tube is avoided in advance.

It is also possible that the reference/evaluation window is fixed, and the means for fixing the evaluation window is formed to detect and adjust the deviation angle between the evaluation window and the spinning cup winding tube. Such misalignment angles can easily occur, especially in connection with conventional transport systems that introduce spinning cups into the machine in the transport direction. This may cause the area of the reference/evaluation window to be located outside the outer contour of the spinning cup, which in turn may result in an evaluation error without rotation of the reference/evaluation window towards the spinning cup winding. is there.

A background is preferably provided, in front of which the digital image of the spinning cup tube can be detected. At this time, if the background has a pattern, the outer contour of the spinning cup winding tube can be easily detected. Furthermore, if the pattern is formed as a chessboard pattern in particular, it becomes easy to detect the orientation of the spinning cup winding tube, and thus the deviation angle with respect to the vertically arranged evaluation window. The pattern can also facilitate orientation and initialization of the imager.

According to another possible aspect, the background is illuminated. In this way, the contrast between the background and the spinning cup tube is further improved. Illumination is preferably done from the side opposite the spinning cup. In this way, unnecessary scattered light does not hit the spinning cup winding tube.

The present invention further comprises a conveying system for the spinning cup and the spinning cup winding pipe, and a device for recognizing the residual yarn in the discharged spinning cup winding pipe, the device being arranged along the conveying path of the spinning cup winding pipe. And a light source that irradiates the spinning cup winding tube with light, an imaging device that creates a digital image of the spinning cup winding tube that passes through, and an evaluation device that evaluates the digital image to recognize the residual yarn. , About the winder. According to the invention, the light source emits a bundle of light, the optical axis of the light source forming an angle of 2° to 8° with the axis of the spinning cup tube.

Preferably, the transport system has, as is known per se, a transport element for transporting the spinning cup and the spinning cup tube in an upright position. During conveyance in the upright state, preferably, a plane including the axis of the spinning cup winding and the optical axis of the light source located in the device is arranged perpendicular to the conveying direction of the spinning cup winding. With such a configuration, the spinning cup winding tube can be optimally conveyed into the apparatus, and a digital image can be generated when passing through the apparatus.

The conveying system has means for stabilizing the spinning cup winding tube standing in the conveying element, preferably in the direction perpendicular to the conveying direction, when the spinning cup winding tube is conveyed in the upright state. ing. By such means, it is possible to prevent the orientation cup of the spinning cup winding tube from swinging, and to accurately maintain the angle between the axis of the spinning cup winding tube and the optical axis of the light source. The stabilizing means may be designed, for example, as a guide in the region of the tip of the tube.

Of course, stabilization of the spinning cup winding tube in the transport direction is difficult to achieve since the transport movement must be guaranteed. The swinging of the orientation of the spinning cup tube in this direction is thus adjusted, as mentioned above, preferably during evaluation.

Next, the present invention will be described in detail using the embodiments shown in the drawings.

It is a figure which shows the winding machine which concerns on this invention. FIG. 5 shows a device according to the invention for recognizing residual yarn. FIG. 3 shows a light source for a device according to the invention. It is a figure which shows the spinning cup winding tube in front of the background which has a chess board pattern.

FIG. 1 shows a winding machine 1 according to the present invention. A large number of winding units 2 are arranged between the end frames 5 and 6. In the winding unit 2, the spinning cup 9 located in the payout portion 10 is rewound into a large volume twill winding package 11. The winding machine 1 shown has a transport system 3 for a spinning cup 9 and a spinning cup winding tube 4. The spinning cup 9 and the spinning cup winding tube 4 are arranged on the carrying tray 8 in an upright state. The transport tray 8 provided with the spinning cup 9 with a full tube is transported from the back side of the winder 1 to the winding unit 2 for feeding. The spinning cup 9 is then already in the standing position required for feeding. A winding tube return section 7 is arranged on the front side of the winder 1. The empty spinning cup winding tube 4 carried out from the winding unit 2 after being fed out is conveyed to the end frame 5 through the winding tube returning section 7 while still standing. The spinning cup 9 may not be fully paid out, and residual yarn may remain in the spinning cup winding tube 4. Such a phenomenon occurs, for example, when the yarn end portion of the spinning cup 9 cannot be found after the yarn breaks and the spinning cup 9 which is not completely fed out is carried out from the winding unit 2. A device 11 for recognizing the residual yarn is arranged in the area of the end frame 5. Further processing of the spinning cup reel 4 takes place in connection with the recognized residual yarn. The completely unwound spinning cup reel 4 with no residual yarn can be used without further treatment to produce a new spinning cup 9 in a ring spinning machine. The spinning cup winding tube 4 having a usable residual yarn is supplied to a cup preparation device (not shown). The cup preparation device finds the yarn end and prepares a spinning cup winding tube 4 with a residual winding for further processing in the winding unit 2. When the residual yarn is unusable, the spinning cup winding tube 4 needs to be cleaned.

In FIG. 1, only the housing of the device 11 for recognizing residual yarn is shown. FIG. 2 shows the principle structure of the device 11. As described above, the spinning cup winding tube 4 is brought to the apparatus 11 while being erected on the transport tray 8 using the transport system 3. The transport direction extends perpendicularly to the drawing plane shown in FIG. 2, and the light source 12 and the camera 13 are also arranged in this drawing plane. A device (not shown) for stabilizing the spinning cup winding tube 4 in the direction perpendicular to the conveying direction of the spinning cup winding tube 4 may be provided in the region of the winding tube tip. This device is designed to avoid swinging of the spinning cup winding tube 4. The axis of the spinning cup winding tube 4 is designated by the reference numeral 15. The light source 12 has an optical axis 16. The light source 12 is arranged on the spinning cup winding tube 4. The light source 12 can emit infrared rays. This makes it possible to eliminate the influence of light in the surroundings at the time of evaluation. Further, infrared rays do not cause any adverse effect on the operator of the winder 1. By using infrared light, it is possible to further recognize any thread color in any winding color.

The optical axis 16 of the light source 12 and the axis 15 of the spinning cup winding tube 4 form an angle α. In the illustrated embodiment, this angle α is 3.3°. A camera 13 equipped with an objective lens and an imaging sensor creates a digital image of the spinning cup winding tube 4. The optical axis 17 of the camera, or more precisely the optical axis of the objective lens of the camera, forms an angle β with the axis 15 of the spinning cup tube 4. In the illustrated embodiment, this angle β is 40°. The light source 12 and the camera 13 are located on a plane perpendicular to the transport direction of the spinning cup winding tube 4.

The image of the spinning cup winding tube 4 is created in front of the background 18. The background 18 is preferably illuminated, so that the spinning cup tube 4 is better raised from the background 18. Illumination is performed using the light source 19 from the side of the background 18 opposite to the spinning cup winding tube 4. The illumination of the background 18 from the rear prevents light that impedes the detection of residual yarns from hitting the spinning cup winding tube 4.

In order to detect the residual yarn, it is sufficient to create only one image created during passage through the spinning cup winding tube 4. Preferably, the light source 12 is activated only at the moment of creating the image. The evaluation of the digital image for possible residual yarns is carried out using the evaluation device 14. Unlike the form shown in FIG. 2, the evaluation device 14 and the camera 13 may form one unit.

In FIG. 3 a possible construction of the light source 12 is shown. In the illustrated embodiment, the light source 12 has three partial light sources 12A, 12B, 12C in order to obtain the largest possible illuminated surface. The partial light sources 12A, 12B, 12C provided with the optical axes 16A, 16B, 16C are arranged concentrically around a central axis defining the optical axis 16 of the entire system. In the lower part of FIG. 3, the light rays 20 of the light sources 12A, 12B and 12C are shown. The irradiation angle of the partial light sources 12A, 12B, 12C, and thus the irradiation angle of the light source 12, is an angle γ. In the illustrated embodiment, the angle γ is 7°. This gives sufficient parallelism of light.

The residual yarn in the spinning cup winding tube 4 can be detected using the evaluation window 22. The evaluation window 22 is preferably rectangular and is dimensioned to lie inside the outer contour of the spinning cup winding tube 4. In the transport direction of the spinning cup winding tube 4, the spinning cup winding tube 4 may oscillate around its vertical orientation depending on the transport system. As a result, the spinning cup winding tube 4 may move to the outside of the vertical evaluation window 22. In FIG. 4, the spinning cup winding tube 4 is shown in front of the background 18 with the chessboard pattern 21. The chessboard pattern 21 is oriented vertically or horizontally. This chessboard pattern 21 makes it possible to clearly recognize that the spinning cup winding tube 4 is displaced from the vertical position. First, the evaluation window 22 is oriented on the chessboard pattern 21. That is, the chessboard pattern 21 enables the deviation angle δ between the evaluation window 22 and the spinning cup winding tube 4 to be easily detected. Since the deviation angle δ can be easily adjusted after the detection, the evaluation window 22 is again located within the outer contour of the spinning cup winding tube 4.

As an alternative, it is also possible to determine the outer contour of the spinning cup winding tube 4 and to orient the evaluation window 22 in advance in this outer contour. In this way, the swing of the spinning cup winding tube 4 can be easily adjusted.

1 winding machine, 2 winding unit, 3 conveying system, 4 spinning cup winding tube, 5,6 end frame, 7 winding tube returning section, 8 conveying plate, 9 spinning cup, 10 feeding section, 11 twill winding package, Device for recognizing residual yarn, 12 light source, 12A, 12B, 12C partial light source, 13 camera, 14 evaluation device, 15 spinning cup axis, 16, 16A, 16B, 16C optical axis, 18 background, 19 light source, 20 rays, 21 chess board pattern, 22 evaluation window

Claims (18)

A light source (12) for irradiating the spinning cup winding tube (4) with light;
An imaging device (13) for creating a digital image of the spinning cup winding tube (4);
An evaluation device (14) for evaluating the digital image in order to recognize residual threads,
A device (11) for recognizing residual yarn in a spinning cup winding tube (4), comprising:
The light source (12) emits bundled light, and the optical axis (16) of the light source (12) is 2° to 8° between the optical axis (16) and the axis (15) of the spinning cup winding tube (4). Device (11) for recognizing residual yarn in a spinning cup winding tube (4), characterized in that it forms an angle (α) of °. The device (11) according to claim 1, wherein the light source (12) is arranged in an upright position on the spinning cup winding tube (4) positioned in the device. Device (11) according to claim 1 or 2 , wherein the light source (12) has an illumination angle (γ) of 7° or less. The device (11) according to claim 1, wherein the light source (12) comprises a plurality of partial light sources (12A, 12B, 12C). The optical axis (17) of the imaging device (13) forms an angle (β) of 30° to 50° with the axis (15) of the spinning cup winding tube (4). Item 11. The device (11) according to item 1. The axis (15) of the spinning cup winding tube (4), the optical axis (16) of the light source (12), and the optical axis (17) of the imaging device (13) are located on one plane. Device (11) according to claim 5 , characterized in that The device (11) according to claim 1, wherein the imaging device (13) comprises an objective lens and an imaging sensor. The evaluation device (14) comprises means for fixing an evaluation window (22) inside the outer contour of the spinning cup winding tube (4), the evaluation window (22) being evaluated for residual yarn. The device (11) according to claim 1, adapted to be. The means for fixing the evaluation window (22) are formed such that the evaluation window (22) in the spinning cup winding tube (4) is oriented when the evaluation window (22) is fixed. Device (11) according to claim 8 . The means for fixing the evaluation window (22) are formed for detecting and adjusting a deviation angle (δ) between the evaluation window (22) and the spinning cup winding tube (4). Device (11) according to claim 8 . Device (11) according to claim 1, characterized in that a background (18) is provided, in front of which the digital image of the spinning cup winding (4) is detectable. Device (11) according to claim 11 , wherein the background (18) has a pattern (21). Apparatus (11) according to claim 12 , wherein the pattern (21) has a chessboard pattern. Device (11) according to any one of claims 11 to 13 , wherein the background (18) is illuminated. A transport system (3) for the spinning cup (9) and the spinning cup winding tube (4); and a device (11) for recognizing the residual yarn in the discharged spinning cup winding tube (4),
The device (11) is arranged along the conveying path of the spinning cup winding tube (4),
A light source (12) for irradiating the spinning cup winding tube (4) with light;
An imaging device (13) for creating a digital image of the spinning cup winding tube (4) passing through;
An evaluation device (14) for evaluating the digital image in order to recognize residual threads,
A winder (1) having:
The light source (12) emits bundled light, and the optical axis (16) of the light source (12) is 2° to 8° between the optical axis (16) and the axis (15) of the spinning cup winding tube (4). Winder (1) characterized in that it forms an angle (α) of °. The winding machine (1) according to claim 15 , wherein the transport system (3) has a transport element (8) for transporting the spinning cup (9) and the spinning cup winding tube (4) in an upright state. ). The plane including the axis line (15) of the spinning cup winding tube (4) and the optical axis (16) of the light source (12) positioned upright in the device (11) is the spinning cup winding tube (4). 17. The winder (1) according to claim 16 , wherein the winder (1) is arranged perpendicular to the conveying direction of (1). In the transport system (3), in the area of the device (11), the spinning cup winding tube (4) erected in the transportation element (8) is arranged in the transport direction of the spinning cup winding tube (4). Winder (1) according to claim 16 or 17 , comprising means for stabilizing in the vertical direction.

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