Detection device for detecting remaining yarn on a spinning cap winding tube

Abstract

To detect a residual winding yarn of a spinning cop winding tube with high reliability.SOLUTION: The present invention relates to a detection device 23 which includes: a light source for irradiating a spinning cop winding tube 6 with light; an imaging device for creating a digital image of the spinning cop winding tube 6; and an evaluation device for evaluating the digital image. The detection device 23 has a reflector which reflects the light emitted by the light source which irradiates the spinning cop winding tube 6. and the evaluation device is configured to create evaluation of whether or not a remaining yarn is present on the spinning cop winding tube 6, and evaluation of which region of the spun cup winding tube 6 of the detected residual winding thread is located. The evaluation device can be connected to the control device for conveying the evaluation, and depending on this evaluation, the control device is configured to initiate a tube cleaning or a subsequent transport according to demand of the cop winding tube 6.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a detection device for detecting residual winding yarn on a spinning cop bobbin, including a light source for irradiating light on the spinning cop bobbin, an imaging device for creating a digital image of the spinning cop bobbin, and an evaluation device for evaluating the digital image. The present invention further relates to a bobbin cleaning device for removing residual winding yarn, including such a detection device, and a winding machine including such a bobbin cleaning device. Finally, the present invention relates to a method for detecting residual winding yarn on a spinning cop bobbin.

[0002] In the winding unit of a winding machine, a feed bobbin, for example, a spinning cop having a relatively small amount of yarn produced in a ring spinning machine, is rewound to form a large-capacity twill-wound package. Supplying the yarn material to the winding unit is performed, for example, in a manually equipped winding machine, through a spinning cop magazine specific to the winding unit. While this spinning cop magazine is formed as a so-called circular magazine, in an automated assembly, the spinning machine is connected to the winding machine via a transport system, and in this transport system, the spinning cop is automatically transported between the spinning machine and the winding machine.

[0003] Due to the usually periodic and high production volume of the spinning cops of recent spinning machines, higher requirements are imposed on the processing capacity of the downstream winding machine. Furthermore, it is necessary to return a sufficient amount of the finished bobbins to the spinning machine. Therefore, in order to ensure a high degree of automation, a closed transport circuit in the area of the winding machine, and in some cases a direct connection to the spinning machine, are widely used. Therefore, the spinning cops and the spinning cop bobbins are used in a circulation process, thereby forming a so-called closed spinning cop and bobbin transport system for the material flow.

[0004] After yarn production in the ring spinning machine, the resulting spinning cups automatically reach the winding machine, where they are fitted onto a cup support or conveyor tray. Via a conveyor belt, the spinning cups are transported from the fitting station to the cup preparation station, where the yarn ends are untangled and prepared for secure subsequent capture. The spinning cups then travel to the winding unit, where rewinding takes place.

[0005] Normally, the spinning cup is fed out in the winding unit until it is completely empty, meaning the spinning cup exits the winding unit as an empty spinning cup. However, some residual yarn remains, and the starting end of this residual yarn can no longer be supplied to the corresponding yarn guide mechanism or splicing device within the winding unit, causing the spinning cup to be mistakenly identified as empty and ultimately ejected from the winding unit. Therefore, there is no guarantee that the ejected spinning cup will always be empty.

[0006] Rather, the discharged spinning cups differ from one another in terms of the remaining yarn and the subsequent processing that results from them. Therefore, in order to automate the winding process, it is necessary to identify the condition of the spinning cups discharged from the winding unit, which will allow for reliable detection of individual remaining yarns or, in some cases, the remaining yarn in the spinning cups that are present.

[0007] For this purpose, such a conveying system is equipped with a reel monitor. The reel monitor detects any remaining yarn on the spinning cup reel. A fully unwound spinning cup, i.e., an empty reel, is automatically returned to the spinning machine for refilling. Conversely, if the reel monitor detects any remaining yarn on the spinning cup reel, the conveying direction of the corresponding spinning cup reel is branched, for example using a brancher, so that the spinning cup reel is conveyed via a secondary conveying path to a reel cleaning device. This reel cleaning device has the task of removing the remaining yarn from the spinning cup reel. However, since there may be cases where the remaining yarn on the reel is still reusable and can therefore be supplied again to the winding unit, the reel monitor also provides information on whether the remaining yarn detected on the spinning cup reel is reusable or not. In this case, the spinning cup winding is not sent to winding cup cleaning, but is instead transported to a cup preparation unit, which detects the yarn start end of the spinning cup, places this yarn start end in a predetermined position, and then supplies the spinning cup back to the winding unit.

[0008] Such a spindle monitor is disclosed, for example, in German Patent Application Publication No. 102014016784. An image is created as the spinning cup or spinning cup spindle passes through, and the subsequent processing of the spinning cup or spinning cup spindle is determined based on this image. To improve the detection of residual yarn, especially minute residual yarn, the apparatus described in the above specification has a light source that illuminates the spinning cup spindle. The light source emits concentrated light, and the optical axis of the light source forms an angle between 2° and 8° with the axis of the spinning cup spindle. Furthermore, there is an imaging device that generates a digital image and an evaluation device that evaluates the digital image, and the evaluation is performed by an evaluation window. The evaluation window is sized to be located within the outer contour of the spinning cup spindle.

[0009] When a small amount of residual yarn, and consequently no longer usable, is detected, the corresponding spinning cup must be thoroughly cleaned before it can be re-incorporated into the spinning / winding process; that is, the residual yarn must be removed, and it is therefore transported to a winding tube cleaning device. Such a device for removing residual yarn from a spinning cup, particularly one standing on a transport element, is described, for example, in German Patent Application Publication No. 4131667. In this cleaning process, a tool is pressed against the winding tube and traveled parallel to the winding tube. To this end, a carriage equipped with a holder for so-called scraping jaws is moved downward from its top dead center to the base of the spinning cup. Here the scraping jaws are closed and pressed against the residual yarn at the base of the cup winding tube. The residual yarn is then removed by a scraper that can travel upward along the winding tube and then sucked up. The spinning cup or the reel containing the remaining yarn is positioned upright on a mandrel fitted onto a disc-shaped conveyor, which is then transported via a belt conveyor to the area of ​​the reel cleaning device of the winding machine and then discharged again via the corresponding transport section.

[0010] In practice, the spinning cup is transported from the winding unit to the winding tube monitor, and if residual yarn that can no longer be fed is detected, the spinning cup is then transported to the winding tube cleaning device. After cleaning, the spinning cup is guided back to the winding tube monitor to detect whether the residual yarn has been successfully removed. If the cleaning is successful and no residual yarn is present on the winding tube, the winding tube is discharged or fed back into the spinning machine. However, if residual yarn is detected by the winding tube monitor despite the cleaning being performed, the spinning cup is transported back to the winding tube cleaning device for another cleaning. If the winding tube monitor detects multiple failures in cleaning the spinning cup by winding tube cleaning, the spinning cup is transported to a station where manual intervention takes place. At this station, the spinning cup is then usually removed from the spinning cup / winding tube transport system, the residual yarn is manually removed, and it is returned to the circulation path.

[0011] Because cleaning checks are first performed at the spindle monitor, spinning cups that are sent multiple times to the spindle cleaning device require correspondingly more time and place a load on the material flow. This is because the spindle monitor is usually located on one side of the machine in the discharge area, while the spindle cleaning device is located in the supply area. In other words, spinning cups / spinning cups with spinning cups coming from the winding unit are discharged to the front side of the winding machine and transported to one side of the machine. On this machine side, the spinning cups / spinning cups with spinning cups pass through the spindle monitor. If residual yarn is detected, the spinning cup is sent again to the supply section located in the rear area and transported to the spindle cleaning device or cup preparation device depending on the residual yarn. Therefore, the spatial separation of the spindle cleaning device and the spindle monitor lengthens the transport path between these devices.

[0012] Furthermore, such residual yarn remaining on the spinning cup always poses a risk of the yarn end unraveling and partially unwinding while the spinning cup continues to be transported, ultimately leading to snagging within the machine or transport system, or somewhere within the machine or transport system. Such dragging yarn not only disrupts the overall material flow but can also ultimately cause the machine to stop, requiring manual intervention.

[0013] The device for removing residual spools further has a fixed cleaning flow. That is, the scraper is always moved downward to the base of the spinning cup, so that it can be brought against the spinning cup and moved upward again, thus scraping off the residual spools. If the residual spools are located, for example, in the central or upper area of ​​the spinning cup, it is not necessary to lower the scraper to the base of the spinning cup and start the cleaning process from the base.

[0014] Accordingly, a first aspect of the present invention relates to a detection device for detecting remaining yarn on a spinning cap, which includes a light source for irradiating light onto a spinning cap, an imaging device for creating a digital image of the spinning cap, and an evaluation device for evaluating the digital image.

[0015] The proposed detection device is characterized in that it has a reflector for reflecting light emitted from a light source that irradiates the spinning cup winding tube, and the evaluation device is configured to make an evaluation of whether or not residual yarn is present on the spinning cup winding tube and in which area of ​​the spinning cup winding tube the detected residual yarn is located, and the evaluation device is connectable to a control device to transmit the evaluation, and depending on this evaluation, the control device is configured to initiate winding tube cleaning or continued transport of the spinning cup winding tube as needed.

[0016] In the detection device, the spinning cup is positioned in front of a reflective background that is illuminated and reflects light when an image of the spinning cup is created. Preferably, a camera positioned perpendicular to the spinning cup creates an image of the spinning cup. This allows the evaluation device to capture an image of the spinning cup and determine the thickness of the spinning cup winding tube. Based on this data, the evaluation device can detect not only whether residual yarn is present on the spinning cup winding tube, but also at what position or height on the spinning cup winding tube the residual yarn is located. Following the evaluation, the results of the evaluation, including whether residual yarn is present and, if so, in what area of ​​the spinning cup winding tube it is located, are transmitted to the control device. If the control device receives a signal that there is no residual yarn on the spinning cup winding tube, winding tube cleaning is not performed on this spinning cup winding tube. However, if the control device receives a signal that residual yarn is present on the winding tube, winding tube cleaning is performed, or the spinning cup is transported to the cup preparation device.

[0017] When reel cleaning is initiated, the control device also receives information about the location of any remaining yarn on the spinning cup reel. If the remaining yarn is located at least in the lower region of the spinning cup reel, the mechanism or scraper travels to the base of the spinning cup reel, where it is pressed against the reel and moved upward. Conversely, if the remaining yarn is detected in the central or upper region of the spinning cup reel, the mechanism is moved downward only enough to press against the spinning cup reel below the remaining yarn, and then moved upward again to scrape the remaining yarn. Thus, on-demand reel cleaning can be understood as cleaning adapted to the remaining yarn, where the cleaning process is performed only to the extent necessary.

[0018] This allows for controlled cleaning that is tailored to and responsive to demand. By detecting the position of the remaining yarn on the spinning cup, cleaning can be intentionally started at the appropriate height. An empty spinning cup winding tube must be stored in advance so that it can be used as a reference only when starting a lot or when using a different spinning cup winding tube.

[0019] The cleaning process is time-saving because the mechanism is moved downward only to the extent necessary to allow it to press against the spinning cup winding rod on the underside of the remaining yarn for scraping.

[0020] In one advantageous configuration, the evaluation device is integrated with the camera.

[0021] If the camera casing also includes the evaluation device, this allows for a compact configuration. The generated images are evaluated, and only the evaluation results are transmitted to the control device, which can be considered to minimize overall data traffic.

[0022] However, it is also possible that the evaluation device is formed outside the camera. In one alternative configuration of the present invention, the evaluation device is integrated into the control unit.

[0023] By integrating the evaluation device into the control device, additional components can be omitted. The created image is transmitted to the control device and evaluated. Within the framework of this invention, the control unit may be formed by a winding unit computer or a central control unit.

[0024] Preferably, the light source is integrated into the camera.

[0025] Regardless of whether the evaluation unit is integrated into the camera casing, the light source may also be located within the camera casing.

[0026] Alternatively, the light source is arranged outside the camera.

[0027] When the light source is positioned outside the camera casing, a less compact configuration is obtained. What is important for the present invention is that the light source can emit light and the light can be reflected by a reflector arranged behind the spinning bobbin.

[0028] In one advantageous configuration, the created digital image is compared with a predefined reference image.

[0029] When a digital image is created by the detection device from this spinning bobbin tube having no remaining winding thread at the start of the lot or when using a new spinning bobbin tube, this image is used as the reference image. That is, subsequent images of the spinning bobbin are compared with this reference image during production, and thereby deviations in the thickness of the spinning bobbin tube can be detected. At the time of evaluation, not only whether the spinning bobbin tube in the image to be compared occupies more space than that in the reference image, but also in which regions the current image deviates from the reference image can be evaluated.

[0030] In another alternative configuration, the data detected using the digital image is compared with reference data.

[0031] In addition to the direct comparison of the two images, it is also possible to identify image data representing the dimensions of the spinning bobbin tube based on the digital image. And based on the images respectively created during production, the image data calculated therefrom is compared with the image data of the reference image. Therefore, in this case as well, not only whether there is remaining winding thread on the spinning bobbin, but also in which regions the remaining winding thread is located can be detected.

[0032] Preferably, the tube cleaning starts under the remaining winding thread.

[0033] Because the location or height at which residual yarn is situated on the spinning cup / spinning cup winding tube can be reliably identified, the winding tube cleaning device can be controlled so that the mechanism is positioned just below the filling level. In other words, the mechanism only needs to be moved downwards to the extent that it can be positioned against the spinning cup winding tube below the residual yarn, thereby allowing the mechanism to scrape the residual yarn from the winding tube during its upward movement. Conventionally, in winding tube cleaning, the location of residual yarn on the spinning cup was unknown, so the prior art typically involved a fixed flow of the cleaning process. That is, during each cleaning, a mechanism such as a scraper was moved downwards to the base of the spinning cup, and an attempt was made to scrape the residual yarn from the winding tube upwards, starting from the base.

[0034] Accordingly, a second aspect of the present invention relates to a spinning tube cleaning device for removing residual yarn from a spinning cup winding tube standing on a conveyor tray, wherein means for removing residual yarn are movable along the spinning cup winding tube.

[0035] This winding tube cleaning device is characterized by including a detection device for detecting remaining winding thread, configured as one of the configurations described above.

[0036] If the winding tube cleaning device is equipped with a detection device according to the present invention that can pinpoint the location of remaining winding yarn and the remaining winding yarn on the spinning cup, the cleaning of the spinning cup can be controlled to match the respective filling levels.

[0037] In other words, when the spinning cup is transported into the reel cleaning device, it is stopped in the reel cleaning device and positioned in an area of ​​a mechanism which may consist of, for example, a holder equipped with scraping jaws as described above. A detection device creates a digital image to detect whether or not residual yarn is present and where the residual yarn is located on the spinning cup reel. If it is detected that there is no residual yarn on the spinning cup reel, or that there is residual yarn that can be supplied to the winding unit again, the spinning cup reel is removed from the reel cleaning device. However, if a signal is received indicating that there is residual yarn on the reel that can no longer be unwound, reel cleaning is started.

[0038] After the winding tube cleaning is performed, when the mechanism reaches top dead center or is moved upward beyond the winding tube, the detection device again creates an image of the spinning cup. As described above, if no remaining yarn is detected on the winding tube, the winding tube continues to be transported, or if remaining yarn is still detected, a new winding tube cleaning is started. Therefore, by using the detection device according to the present invention, the success of the cleaning can be confirmed after each cleaning step. Since this confirmation is still performed by the winding tube cleaning device itself, there is no need for spinning cups that have not been cleaned successfully and therefore still have remaining yarn to be transported back to the winding tube monitor and then back to the winding tube cleaning device. This not only reduces the burden on the material flow but also saves time, thereby allowing such spinning cup winding tubes to be supplied back to the spinning machine more quickly.

[0039] Another advantage is that the spinning cup is no longer transported along with the remaining yarn from the bobbin cleaning device to the bobbin monitor, and then back to the bobbin cleaning device, thereby minimizing, at least in this area, the risk of dragged yarn that could disrupt the material flow and even cause the entire machine to shut down.

[0040] Since the position of any remaining yarn on the reel is also detected, the mechanism for scraping off the remaining yarn only needs to move downwards enough to make contact with the spinning cup below the remaining yarn. Because the remaining yarn is often located in the central or upper region of the spinning cup reel, this shortens the cleaning process and improves the overall efficiency of the reel cleaning device.

[0041] In conventional technology, the winding tube cleaning mechanism typically followed a fixed flow; that is, for each cleaning step, it was first moved downwards to the base of the spinning cup, and then moved upwards to scrape off any remaining yarn from the spinning cup. Now, however, by knowing the position of the remaining yarn on the spinning cup, it is possible to control each individual cleaning step according to demand. Immediately after a cleaning step, it is possible to confirm whether the cleaning was successful or whether any remaining yarn is still present on the spinning cup, thus reducing the overall load on the material flow and eliminating the risk of drag yarn formation. Furthermore, if residual yarn is still present despite the cleaning step being performed, a new cleaning step can be started immediately.

[0042] Accordingly, a third aspect of the present invention relates to a winding machine including a plurality of work units, a conveying system for spinning cups and spinning cup windings, and a windings cleaning device.

[0043] This winding machine is characterized in that at least one winding tube cleaning device is configured according to the configuration described above.

[0044] Empty tubes discharged from the winding unit, winding tubes with a small amount of remaining yarn, and winding tubes with more, reusable remaining yarn are typically transported together to a winding tube monitor located at the end of the machine. In this winding tube monitor, the spinning cup winding tubes are sorted based on the remaining yarn and the amount that remains, for different subsequent processing. Spinning cups / spinning cup winding tubes with little, and therefore no longer usable, remaining yarn are then transported by the winding tube monitor to a winding tube cleaning device.

[0045] The operating time of the spinning cup in the winding unit is typically between 1 and 3 minutes, depending on the amount of yarn and the performance of the winding machine. Therefore, in winding machines equipped with multiple winding units, a large number of spinning cups are frequently transported to the winding tube monitor and, consequently, to the winding tube cleaning device.

[0046] If the winding machine has a winding tube cleaning device as described above, the individual cleaning process can be performed in a short time when residual yarn is located only on the upper side of the spinning cup base by controlling the cleaning process according to the demands, thereby allowing the winding tube cleaning device to operate more efficiently overall.

[0047] However, this allows the winding machine or assembly material flow to be reduced because each individual cleaning process can be inspected for success by the winding machine itself. If the cleaning of the spinning cup is unsuccessful, there is no need to transport the spinning cup back to the winding machine monitor, and then from the winding machine monitor back to the winding machine cleaning machine, thus reducing the time required to perform a new cleaning attempt, especially if the cleaning attempt is unsuccessful. Ultimately, such spinning cups can be fed back to the spinning machine more quickly.

[0048] Furthermore, this is advantageous because it minimizes the number of spinning cups that must be transported from the reel cleaning device to the reel monitor along with the remaining yarn, and then back to the reel cleaning device. This is particularly advantageous in this area because it prevents the remaining yarn from unraveling and becoming tangled, thereby preventing the formation of so-called dragged yarn. Such dragged yarn not only impairs the material flow but also usually requires manual intervention and can even cause the machine to stop.

[0049] Therefore, a fourth aspect of the present invention relates to a method for detecting remaining yarn in a spinning cup winding tube.

[0050] The method is characterized by the following steps: in the first step, a digital image of the spinning cap winding tube is created; in the second step, an evaluation is performed to determine whether residual yarn is present on the spinning cap winding tube and in which region of the spinning cap winding tube the detected residual yarn is located; in the third step, the evaluation is transmitted to a control device; and in the fourth step, depending on the evaluation, winding tube cleaning or continued transport of the spinning cap winding tube is started according to the demands of the spinning cap winding tube.

[0051] This makes it possible to achieve the advantages and effects described in relation to this.

[0052] In the method according to the present invention, a spinning cup is illuminated in front of a reflective background to create a digital image. This image or transmitted light image is compared to an image created from a spinning cup reel that does not have residual yarn at the start of the lot. In the simplest case, the thickness or diameter of the spinning cup reel is evaluated. This evaluation can be performed by image comparison or by image data obtained based on the created image. This makes it possible to detect not only whether residual yarn is present on the spinning cup reel, but also in which region of the spinning cup / spinning cup reel the residual yarn is located. This evaluation is transmitted to a control device, which then initiates the subsequent processing of the spinning cup / spinning cup reel based on the result. In other words, the spinning cup is distinguished in terms of whether there is no residual yarn, whether there is residual yarn that can be unfed, or whether there is residual yarn that can no longer be unfed. If no residual yarn is detected, the empty spinning cup reel is fed to the ring spinning machine. If residual yarn that can still be unwound is detected, the spinning cup is transported to a cup preparation device, where it is prepared for a new unwinding process in the winding unit. Conversely, if residual yarn that can no longer be unwound is detected on the spinning cup, the spinning cup undergoes winding tube cleaning, in which case the winding tube cleaning device receives information about the location of the residual yarn on the spinning cup winding tube. This makes it possible to control winding tube cleaning according to the demand for each type of residual yarn and its location. This allows for the time-optimized execution of individual cleaning processes, as long as the residual yarn is located in the central or upper region of the spinning cup or spinning cup winding tube.

[0053] Further features and advantages of the present invention will become apparent from the following description of preferred embodiments of the invention, from the figures and drawings illustrating important details for the invention, and from the claims. Individual features may be realized individually or in any combination in preferred embodiments of the invention.

[0054] Preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. [Brief explanation of the drawing]

[0055] [Figure 1] This is a schematic plan view showing a transport system arranged in the area of ​​a winding machine, which includes a detection device according to the present invention. [Figure 2] This figure shows a detection device according to the present invention for detecting remaining spools of yarn.

[0056] Figure 1 schematically illustrates the (spinning cup / winding tube) conveying system 3 of the winding machine 1, which is connected to the conveying system (not shown) of a ring spinning machine via a connecting section 21 or 22. During operation, spinning cups 4 produced in one or more ring spinning machines, which are arranged vertically on the conveying tray 5, are supplied to the conveying system 3 of the winding machine 1 via the connecting section 21 on the inlet side.

[0057] The spinning cup winding tube 6 that has been unwound in the winding unit 2 of the winding machine 1 is then discharged via the outlet-side coupling section 22. The transport system 3, which is known in itself and is illustrated in Figure 1, has a number of different transport sections through which spinning cups 4 are supplied to a number of winding units 2, or through which unwound spinning cup winding tubes 6 are discharged.

[0058] The conveyor tray 5, equipped with the spinning cup 4, first reaches the supply section 7 located in the area on the rear side of the winding machine 1. From this supply section 7, a so-called preparation section 8 branches off. A preparation device 9 is located in the area of ​​the preparation section 8, where the supplied spinning cup 4 is prepared for the subsequent rewinding process.

[0059] The prepared spinning cups 4 travel from the preparation section 8, through the connection section 10, to the so-called storage section 11. The reversibly drivable storage section 11 sequentially distributes the transport trays 5, each containing the prepared spinning cups 4, to one of several lateral transport sections 12. Each of the lateral transport sections 12 passes through one of several winding units 2 of the winding machine 1 and connects at the exit side to a return section 13 located on the front side of the winding machine 1.

[0060] Sometimes, the spinning cup 4 is not fully unwound, leaving residual yarn on the spinning cup winding tube 6. This can occur, for example, when the yarn end can no longer be found on the spinning cup 4 after the yarn breaks, and the incompletely unwound spinning cup 4 is discharged from the winding unit 2.

[0061] In this embodiment, a reel monitor 14 is positioned in the area of ​​the reel return section 13, which inspects the filling state of the spinning cup reel 6 delivered onto the transport tray 5. Subsequent processing of the spinning cup 4 or spinning cup reel 6 depends on the detected remaining yarn. That is, a transport tray 5 with a completely empty spinning cup reel 6 is immediately sent back to the ring spinning machine via the outlet-side coupling section 22, whereas a transport tray 5 with a spinning cup reel 6 that still has remaining yarn is first branched into the so-called lateral passage 15. A spinning cup reel 6 with still usable remaining yarn is supplied back to the preparation device 9 via the coupling section 20. The preparation device 9 detects the yarn end and prepares the spinning cup 4 with the remaining yarn for subsequent processing in the winding unit 2. If the remaining yarn is unusable, the spinning cup 4 needs to be cleaned in the reel cleaning device 17. The reel cleaning device 17 is also called a reel cleaner.

[0062] To this end, a winding tube cleaning section 16 equipped with a winding tube cleaner 17 is connected to the lateral passage 15. Furthermore, a connecting section 18 to the supply section 7 and, for example, a manual preparation section 19 branch off from the winding tube cleaning section 16. Naturally, the winding tube monitor 14 and / or the winding tube cleaning section 16 or winding tube cleaner 17 may be located elsewhere in the transport system 3 of the winding machine 1, for example, on the rear side of the winding machine 1 in the area of ​​the supply section 7. The winding tube cleaner 17 or winding tube cleaning device itself is publicly known and is not the subject of this application, so it will not be described in detail. The winding tube cleaner 17 may be configured, for example, as described in German Patent Application Publication No. 4131667.

[0063] As shown in Figure 1, during winding operation, within the conveying system 3, multiple conveying trays 5, each loaded with a spinning cup 4 or spinning cup winding tube 6, circulate in the conveying direction T. The aforementioned supply section 7 is usually further directly connected to the return section 13 via a coupling section 20.

[0064] Figure 1 shows only the casing of the detection device 23 for detecting remaining yarn. Figure 2 shows the principal structure of the detection device 23. As already described, the spinning cup 4 or spinning cup winding tube 6 is brought into the detection device 23 on the transport tray 5 by the transport system 3, and this detection device 23 may be integrated into the winding tube cleaner 17 as shown in Figure 1. It is also possible that the detection device 23 is located downstream of the winding tube cleaner 17. The axis of the spinning cup winding tube 6 is denoted by reference numeral 29. The imaging device 25 has an optical axis 30. The light source 24 and the evaluation device 26 are integrated into the imaging device 25 in this embodiment, but they may be configured individually or both separately.

[0065] The imaging device 25, which may be configured as a camera, can, for example, emit infrared light. The imaging device 25 has an objective lens and an imaging sensor, and creates a digital image of the spinning cap winding tube 6. The optical axis 30 of the camera, more precisely the optical axis of the camera's objective lens, forms a right angle with the axis 29 of the spinning cap winding tube 6.

[0066] An image of the spinning cap winding tube 6 is created in front of the reflector 27. Illumination is performed by the light source 24, illuminating a reflective background. A silhouette image or shadow image is formed. In the evaluation device 26, the created image or image data obtained based on this image is compared with a previously stored image or image data, so that any remaining yarn present is detected along with its position on the spinning cap winding tube.

[0067] To detect residual yarn, the creation of only one image is sufficient. Preferably, the light source 24 is activated only at the moment of image creation. Evaluation of the digital image regarding any residual yarn is performed by an evaluation device 26 connected to the control device 28. Unlike in Figure 2, the light source 24, evaluation device 26, and imaging device 25 may be configured separately. The evaluation device 26 may be integrated into the control device 28. [Explanation of Symbols]

[0068] 1. Winding machine 2. Winding Unit 3. Conveying System 4 Spinning cups 5. Transport tray 6 Spinning cup winding tube 7. Supply Section 8 Preparation section 9 Preparation equipment 10 Connection Sections 11 Storage section 12 Lateral transport section 13 Return section 14 Winding pipe monitor 15. Lateral passageway 16. Tube cleaning section 17. Tube cleaning device 18. Joining interval 19 Manual preparation section 20 Join category 21 Joint interval 22 Joint intervals 23 Detection device 24 Light source 25 Imaging device 26 Evaluation device 27 Reflector 28 Control device 29 axis 30 axis T Conveying direction

Claims

1. A detection device (23) for detecting remaining yarn on a spinning cap winding tube (6), comprising a light source (24) for irradiating the spinning cap winding tube (6) with light, an imaging device (25) for creating a digital image of the spinning cap winding tube (6), and an evaluation device (26) for evaluating the digital image, in the detection device (23), The detection device (23) has a reflector (27) that reflects light emitted from the light source (24) that irradiates the spinning cap winding tube (6), The evaluation device (26) is configured to generate an evaluation of whether or not residual yarn is present on the spinning cup winding tube (6), and in which region on the spinning cup winding tube (6) the detected residual yarn is located. The evaluation device (26) is connectable to the control device (28) to transmit the evaluation, Depending on the evaluation, the control device (28) is configured to initiate winding tube cleaning or continued transport of the spinning cup winding tube (6) according to demand. The image of the spinning cap winding tube (6) is created in front of the reflector (27), where illumination is performed by a light source (24), illuminating a reflective background and forming a silhouette or image. A detection device (23) characterized by the above.

2. The detection device (23) according to claim 1, wherein the evaluation device (26) is integrated with the imaging device (25).

3. The detection device (23) according to claim 1, wherein the evaluation device (26) is integrated into the control device (28).

4. The detection device (23) according to claim 1, wherein the light source (24) is integrated into the imaging device (25).

5. The detection device (23) according to claim 1, wherein the light source (24) is located outside the imaging device (25).

6. The detection device (23) according to claim 1, wherein the digital image is compared with a predetermined reference image.

7. The detection device (23) according to claim 1, wherein the data detected based on the digital image is compared with reference data.

8. The detection device (23) according to claim 1, wherein winding tube cleaning is started below the remaining winding thread.

9. A winding tube cleaning device (17) for removing residual yarn from a spinning cup winding tube (6) standing on a conveying tray (5), wherein the means for removing the residual yarn is movable along the spinning cup winding tube (6), The winding tube cleaning device (17) is characterized in that it has a detection device (23) for detecting remaining winding thread as described in any one of claims 1 to 8.

10. A winding machine (1) comprising a number of winding units (2), a conveying system (3) for spinning cups (4) and spinning cup winding tubes (6), and a winding tube cleaning device (17), The winding machine (1) is characterized in that it has at least one winding tube cleaning device (17) as described in claim 9.

11. A method for detecting remaining yarn on a spinning cap winding tube (6), comprising: a light source (24) for irradiating the spinning cap winding tube (6) with light; an imaging device (25) for creating a digital image of the spinning cap winding tube (6); and an evaluation device (26) for evaluating the digital image, wherein In the first step, a digital image of the spinning cap winding tube (6) is created. In the second step, an evaluation is performed to determine whether or not residual yarn is present on the spinning cup winding tube (6), and to which region on the spinning cup winding tube (6) the detected residual yarn is located. In the third step, the evaluation is transmitted to the control device (28). In the fourth step, depending on the evaluation, winding tube cleaning or continued transport of the spinning cup winding tube (6) is initiated according to the demand. In the first step described above, an image of the spinning cap winding tube (6) is created in front of a reflector (27) that reflects light emitted from the light source (24), the illumination is performed by the light source (24), illuminating a reflective background and forming a silhouette image or shadow image. A method characterized by the following features.

Images