CN113518753A - Method and device for checking wound yarn bobbin - Google Patents

Abstract

The invention relates to a method and a device for inspecting wound yarn bobbins (6) in a melt spinning process. In this case, a plurality of bobbin parameters are detected in succession on one of the yarn bobbins (6) and analyzed for quality assessment. In order to obtain a desired advantageous material flow independently of the inspection, according to the invention, at least one of the bobbin parameters of the yarn bobbin (6) is determined when the yarn bobbin (6) is conveyed through the doffing device (8). For this purpose, one of the measuring devices (11.1-11.4) for measuring one of the bobbin parameters is fixed to the doffing device (8).

Description

Method and device for checking wound yarn bobbin

The invention relates to a method for inspecting a bobbin of wound yarn according to the preamble of claim 1 and to a device for inspecting a bobbin of wound yarn in a melt spinning process or a yarn texturing process according to the preamble of claim 9.

In the melt-spinning production of synthetic threads or in the further processing of synthetic threads in a thread texturing process, it is customary to wind the thread to be stored to form a plurality of bobbins. Such a bobbin can then be fed for further processing. In order to allow the yarn to be drawn off from the winding bobbin without interruption during the further processing, on the one hand, and to combine bobbins of the same quality with one another, it is also customary for the winding bobbin to be subjected to a bobbin check before the further processing. The appearance of the yarn bobbin is detected and analyzed in the bobbin checking process. For example, the formation of bulges on both ends or saddles on the circumferential surface can be determined by optical monitoring of the yarn bobbin. In order to be able to determine all bobbin parameters of the yarn bobbin, the yarn bobbin is subjected to a bobbin check before further processing. A general method and a general device for checking yarn bobbins are known, for example, from DE20218115U 1.

In the known method and apparatus, bobbins of yarn are produced in a number of spinning positions in a melt spinning process. The wound yarn bobbins are transported away from the spinning position by a doffer and transferred to a transport system. The measuring device and the weighing station, at which the bobbin parameters of the yarn bobbin are detected, are arranged in the transport system. The surface and the contour of the yarn package are optically detected in a measuring device. The measured bobbin parameters are assigned to each bobbin and a quality assessment is made. In particular, in known methods and known devices, special devices for optically detecting the circumferential surface and the end faces of a thread bobbin are provided for visual inspection of the thread bobbin. In addition to the additional complexity in terms of equipment, additional test times are required to carry out the material flow of the yarn bobbins.

The object of the present invention is therefore to improve a method and a device for inspecting yarn bobbins in a melt spinning process or a yarn texturing process of the generic type in such a way that, despite the bobbin inspection, a continuous material flow of the yarn bobbins is obtained as far as possible.

Another object of the invention is to provide a method and a device for inspecting a yarn bobbin, by means of which a high degree of automation can be achieved.

According to the invention, this object is achieved by an inspection method having the features of claim 1 and by an inspection device having the features of claim 9.

Advantageous developments of the invention are defined by the features and feature combinations of the respective dependent claims.

The present invention differs from the concept of a central inspection station where all bobbin parameters are detected centrally. In contrast, the inventors have intended to use the material flow during the transport of the yarn bobbins and the conditions occurring therein for detecting individual bobbin parameters. Thus, at least one bobbin parameter of the yarn bobbin is determined when the yarn bobbin is conveyed away from the spinning station or the winding position by the doffing device.

According to the invention, for this purpose, a measuring device for detecting one of the bobbin parameters is fastened to the doffing device. The doffing device can be used to remove the yarn bobbin from the spinning or winding position and can be used to determine at least one bobbin parameter of the yarn bobbin.

Since the side surfaces of the thread bobbins are freely accessible when the thread bobbins wound on the winding spindles are picked up by the support mandrel of the doffer, a method variant is preferably implemented in which the side surfaces of the thread bobbins are successively optically detected on the thread bobbins when they are transferred from the winding spindles of the winding machine to the support mandrel of the doffer. Deviations in the shape of the yarn bobbins can then be detected at an early stage in order to also trigger a preemptive intervention into the spinning process if necessary.

The invention development in which the outer surface of the yarn bobbin is optically detected after the yarn bobbin has been transferred from the winding position of the texturing machine to the take-up device of the doffing device is particularly advantageous in the case of individual winding of the yarn bobbin in a plurality of winding positions of the yarn texturing process. Thus, a potential shape defect of the wound bobbin can be directly assigned to the winding position in order to initiate a possible correction in a defined manner.

For this purpose, the device according to the invention is realized in such a way that the measuring device is formed by a camera which is assigned to the support mandrel of the doffer or to the receiving device of the doffer. The thread bobbin can then already be visually detected when it is pushed onto the supporting mandrel or when it is placed in the receiving holding rod, in order to determine at an early stage whether the thread bobbin forms a saddle shape, for example, as a result of a traversing error.

Since different processes are required during the transport of the yarn bobbins before packaging or directly before further processing, a method variant is particularly advantageous in which further bobbin parameters of the yarn bobbins are detected at further measuring points which are designed to be distributed along the transport path of the yarn bobbins. Other visual characteristics of the yarn bobbin can then already be detected during the transport.

The end faces of the yarn bobbins are then visible by separating the yarn bobbins from the supporting mandrel of the doffer or after the yarn bobbins have been delivered or removed from the doffer.

This is particularly the case in the case of a method variant in which the end face is optically detected as one of the bobbin parameters when the yarn bobbin is removed from the support mandrel of the doffer device and/or when the yarn bobbin is transferred from the doffer device to the delivery device.

The other measuring devices are therefore arranged in a manner distributed in a plurality of measuring positions along the transport path of the thread bobbin.

For detecting the end face of the yarn bobbin, a further camera is provided which is assigned to the transfer station (where the yarn bobbin can be transferred from the doffer to the transport system). One of the end faces can thus be detected when it is removed from the support mandrel, and the opposite end face can be detected by the other camera when it is transferred to the conveying device.

The guiding of the individually separated thread bobbins within the conveying device is now particularly suitable for determining the bobbin weight of the thread bobbins at the weighing station.

In order to ensure a corresponding assignment between the yarn bobbins and the respective measured bobbin parameters, a method variant is particularly advantageous in which a plurality of measurement results generated at the measuring location are stored in a central database with an identification code assigned to the yarn bobbin. It is thus also ensured that all detected bobbin parameters are assigned to the respective yarn bobbin.

In order to be able to carry out the quality assessment, it is also provided that the bobbin parameters of the yarn bobbins are jointly analyzed by means of at least one analysis program. The sorting of the yarn bobbins can thus be carried out during packaging or further processing.

The quality determined in the analysis can also be advantageously used here for controlling the sorting device for packaging yarn bobbins or for filling creels for further processing.

In order to allow such an evaluation, a development of the device according to the invention is provided, in which the measuring device is connected to a central database for storing bobbin parameters, wherein the database is assigned to the evaluation unit.

The evaluation unit is connected to the sorting device at the end of the conveying path in order to be able to perform an automated quality classification.

The method according to the invention for inspecting a yarn bobbin and the device according to the invention for inspecting a yarn bobbin allow an integration between the yarn bobbin transport and the yarn bobbin quality test. The special treatment of the yarn bobbins which are transported to the central checking station and are associated therewith is abandoned. By integrating the bobbin inspection in the material flow of the yarn bobbin, an efficient and cost-effective automation can be achieved.

The method according to the invention for checking a wound yarn bobbin is explained in more detail below by way of an exemplary embodiment of a device according to the invention for checking a wound yarn bobbin and with reference to the drawings, in which:

fig. 1 schematically shows a plan view of the entire system for removing yarn bobbins from a plurality of spinning positions;

FIG. 2 shows a schematic side view of the spinning position during the transfer of a yarn package;

FIG. 3 is a plan view schematically showing the transfer position when separating the yarn bobbins;

FIG. 4 schematically shows a side view of the weigh station;

figure 5 schematically shows a side view of a sorting station;

fig. 6 shows a schematic side view of a plurality of winding positions of a texturing machine during the transfer of a yarn package.

The entire system for removing bobbins of thread from a plurality of spinning positions of a melt spinning device is shown schematically in fig. 1. The melt spinning device has a plurality of spinning stations 1, each of which has a winding machine 5 at the end of the process for receiving and winding up the thread. In this connection, the melt spinning device is shown only by a plan view of the winding machine 5 in the spinning station 1. A plurality of spinning stations 1 are arranged opposite one another here and form a doffer gallery 25. A mobile doffing device 8 for receiving and removing the wound yarn bobbin is arranged in the doffing gallery 25. The yarn bobbins produced in the spinning station 1 are taken up and transported away by a doffer device 8. This process is illustrated in fig. 2, and the following description thus refers to fig. 1 and 2.

Fig. 2 schematically shows a side view of the spinning station 1 during the taking of a yarn package by the doffer device 8.

The winding machine 5 is implemented in the spinning station 1 with two winding spindles 7.1 and 7.2, wherein the winding spindle 7.2 is held in the exchange position with the wound yarn bobbin 6. The yarn produced in the melt spinning process is continuously wound to form bobbins on driven winding spindles 7.1.

In order to obtain a yarn package 6 from the winding spindle 7.2 by the support mandrel 9 of the doffing device 8, the support mandrel 9 is first located directly in front of the winding machine 5. As soon as the support mandrel 9 is held at the level of the winding spindle 7.2, the ejection device 10 on the winding machine 5 is activated, said ejection device 10 ejecting the thread bobbin 6 off the winding spindle 7.2 and thereby pushing the thread bobbin 6 onto the support mandrel 9 of the doffer device 8. The doffing device 8 has a projecting bearing 8.2 on the running gear 8.1, which bears a first measuring device 11.1 at the free end. The measuring device 11.1 is realized in the form of a camera 12.1, which is connected to a database 18 by wireless communication. Each thread bobbin 6 has a readable code, which is detected by the scanner 13 and is fed to the database 18. In this connection, the images acquired by the camera 12.1 can be correlated directly in the database 18 by means of the identification code of the thread bobbin. After all the thread bobbins 6 have been placed on the support mandrels 9 of the doffer device 8, the doffer device 8 is guided to the transfer station 2.

For the explanation of the transfer station 2, reference is made to fig. 3 in addition to fig. 1. Fig. 1 and 3 show plan views of the transfer station 2. The doffer device 8 interacts with a conveyor device 14 in the transfer station 2. The transport device 14 is formed in this embodiment by a suspension rail 15, on which a plurality of bobbin carriages 16 are guided. The bobbin carriage 16 has a receiving spindle 17 for receiving one of the thread bobbins 6 from the doffer device 8. Two further measuring positions each having one measuring device 11.2 and 11.3, respectively, are provided in the transfer station 2. The measuring devices 11.2 and 11.3 are likewise formed by further cameras 12.2, 12.3 provided for visual detection of bobbin parameters. The camera 12.2 is then assigned to the support mandrel 9 of the doffing device 8 in such a way that the respective end face of the thread bobbin 6 is optically detected before separation. The doffing device 8 likewise has an ejection device (not shown here) for the individual supply of the yarn bobbins 6 to the receiving spindles 17 of the bobbin carriage 16. After the yarn bobbin 6 has been pushed onto the receiving mandrel 17, the bobbin carriage 16 is moved into an adjacent measuring position with the measuring device 11.3 designed as a further camera 12.3. The camera 12.3 is directed at the end face of the thread bobbin 6, which is not visible on the support mandrel 9. In this connection, the visual features of the end faces of the thread bobbins 6 can be optically detected in the transfer station 2.

As can be taken from the illustration in fig. 1, the measuring devices 11.1, 11.2 and 11.3 are jointly wirelessly connected to the database 18. The sequence during the transfer of the bobbins to the transport device 14 is recorded here, so that the measurement results of the measuring devices 11.2 and 11.3 are also stored in the database 18 with the respective identification code of the bobbins.

As is apparent from the illustration in fig. 1, the bobbin carriage 16 passes through the weighing station 3. The side view of the weighing station is schematically shown in fig. 4, so that the following description applies to both figures.

The weighing station 3 is equipped with a scale 20 which acts directly on the bobbin carriage 16 with the attached yarn bobbin 6. Each bobbin 6 can be weighed in this way. Scales 20 are also wirelessly connected to database 18. The identification code which receives the bobbin weight and distributes it to the thread bobbins 6 is ensured by the feed sequence of the thread bobbins 6.

Finally, the yarn bobbin 8 is guided to the sorting device 4. The sorting device 4 is schematically shown in a side view in fig. 5, so that the following description applies to fig. 1 and 5.

The sorting device 4 has a robot arm 21, which holds a gripper tool 22 on its robot arm 21.1, by means of which the thread bobbin 6 can be removed from the receiving mandrel 17 and introduced into a packaging container 23. The robot 21 is controlled here by a control device 24. The control device 24 is linked to the evaluation unit 19.

As can be seen from the illustration in fig. 1, a plurality of packaging containers 23 are assigned to the robot 21. The robot 21 is controlled by means of a control device 24 in such a way that the yarn bobbin 6 is placed in one of the transport containers 23 in connection with the quality assessment.

In the embodiment of the overall system shown in fig. 1 for removing yarn bobbins, bobbin parameters at a plurality of measuring points are detected by a plurality of measuring devices distributed in the transport path of the yarn bobbins and are stored centrally in the database 18. The first measuring position is located in the spinning position 1, in which spinning position 1 the doffing device 8 picks up a yarn bobbin 6. While the yarn bobbin 6 is being taken up, the side surface of the yarn bobbin 6 is optically detected by a camera 12.1 fixed to the doffing device 6. The camera 12.1 is wirelessly connected to the database 18, so that the optical detection result of the lateral surface of the yarn bobbin 6 is stored as a first bobbin parameter.

In the further course of the removal of the thread bobbin 6, the doffer device 8 reaches the transfer position 2. In this exemplary embodiment, two further measuring positions are realized in the transfer station 2 for determining further visual characteristics of the yarn bobbin as a bobbin parameter. The front end of the thread bobbin 6 can then be detected by means of the camera 12.2, and the rear end of the thread end 6 can be detected by means of the camera 12.3. The optical measuring devices 11.2 and 11.3 are also wirelessly connected to the database 18, so that further records of the thread bobbin 6 are stored together with the records of the side surfaces with the respective identification code of the thread bobbin.

The bobbin weight of the yarn bobbin 6 is determined as a final bobbin parameter. For this purpose, a scale 20 is provided in the weighing station 3. The scale 20 is also wirelessly connected to the database 18. For each yarn bobbin, all bobbin parameters measured in the bobbin check are then stored centrally in the database 18. The database 18 cooperates with an evaluation unit 19, which has at least one evaluation program for analyzing all images of the yarn bobbins from the database 18. Abnormal elevations, saddle formations, rings or spirals can then be identified, for example. In addition, the degree of soiling of the yarn or other yarn damage caused by flying and broken filaments can be known from the recording. For example, winding defects, such as those caused by the shedding and exposed loops, can also be identified. In addition to the images, the bobbin weight is also used to make inferences therefrom relating to, for example, bobbin density. The analysis method leads to the evaluation of the bobbin parameters with respect to the quality of the respective yarn bobbin. Thus, for example, a classification can be carried out in order to ideally distinguish the quality classes a and B.

The quality assessment is converted by the assessment unit 19 into control commands, which are fed to the control device 24. By means of the control device 24, the robot 21 will perform the removal and packing of the yarn bobbins on the basis of the quality assessment.

In the sorting device 4 shown in fig. 1, each yarn bobbin 6 is placed in a transport container 23. In principle, however, such a transport container 23 can also be replaced by a creel or a plurality of creels, on which a plurality of creel seats are formed, in which the yarn bobbins are positioned. Such creels can then be distributed directly to further processing processes, such as texturing machines. The loading of the creel can then advantageously be automated.

In the embodiment shown in FIG. 1, the yarn package is produced in a winder of a melt spinning process. However, it is also common in the further processing of a yarn texturing process for the doffer device to take up a plurality of yarn bobbins in an automated manner from a plurality of winding stations and to feed them to a transport system. The bobbin check of the yarn bobbin can be carried out in the same manner as shown in the exemplary embodiment according to fig. 1. In this case, however, doffers are used which have a receiving device in order to be able to obtain individual wound yarn bobbins from the winding position. Such an embodiment is schematically illustrated in fig. 6.

Fig. 6 shows only the situation in which the doffing device 8 receives a plurality of yarn bobbins 6 from a plurality of winding positions 26 of the texturing machine, which are arranged one above the other. Such texturing machines which are used in the yarn texturing process in more than 400 processing positions are known, for example, from EP3008232B1 and are described here. In this regard, references are made to the publications cited herein and only the components relevant to the present invention are described herein.

As can be seen from the illustration in fig. 6, a plurality of winding positions 26 are arranged one above the other in the machine frame 33. On the machine longitudinal side facing the doffing gallery 25, each winding position 26 has a bobbin drop rack 27 and a bobbin storage 28. The yarn bobbin 6 wound from the winding position 26 is dropped into a bobbin drop frame 27.

In order to remove a yarn bobbin 6 from the bobbin drop rack 27 of the winding position 26, the doffing device 8 is moved along the doffing corridor 25 parallel to the machine longitudinal side of the texturing machine. The doffing device 8 has in this exemplary embodiment a running gear 8.1 and a support 8.2. A receiving device 29, which has a plurality of receiving jaws 30 on the side facing the winding position, is arranged on the support. A plurality of receiving jaws 30 are assigned to a plurality of winding positions 26 and are arranged one above the other. The doffing device here also usually has a plurality of receiving jaws 30 arranged next to one another, so that the receiving jaws 30 can serve a plurality of winding positions 26 in the vertical as well as in the horizontal direction. The receiving jaw 30 is embodied so as to be pivotable in order to be able to receive a yarn bobbin held in the bobbin drop rack 27. The receiving jaw 30 is here preferably driven and pivoted by a common drive mechanism.

In this embodiment, the receiving jaw 30 cooperates with a receiving holding rod 31, in which the yarn bobbin 6 can be placed. The receiving holding rods 31 are each assigned a measuring device 11.1 in the form of a camera 12.1. The circumferential surface of the thread bobbin 2 can be optically detected by the camera 12.1. For this purpose, the receiving holding rod 31 preferably has a friction drive in order to be able to rotate the yarn bobbin by at least 360 °. The measuring device 11.1 is preferably connected directly to the database, as is shown, for example, in fig. 1.

The transfer of the yarn bobbins to the transport system takes place in this embodiment by means of a plurality of transfer jaws 32, which take the yarn bobbins 6 from the take-up holding bars 31 and transfer said yarn bobbins 6 to the transport system, as is shown, for example, in fig. 1.

However, in the exemplary embodiment shown in fig. 6, other measuring devices for visual detection of the end face can also be arranged on the support 8.2 of the doffer device 8. The entire outer contour of the yarn bobbin can then advantageously already be detected during the taking-up and before being transferred to the transport system.

It is explicitly mentioned here that the exemplary embodiment of a doffing device for receiving individual yarn bobbins in the winding position of a texturing machine, as shown in fig. 6, is exemplary. It is important here that a first measurement for checking the bobbin is carried out directly at the doffer.

The entire system shown in fig. 1 for removing a wound yarn bobbin is also exemplary in terms of doffer and transport device embodiments. In principle, a plurality of doffing devices guided on a suspension rail can also be used. The bobbin carriage can also be provided with a plurality of receiving spindles in order to directly guide a group of yarn bobbins. With regard to the method according to the invention and the device according to the invention, it is important that the measuring device and the measuring location are integrated in the transport path of the thread bobbin. A central checkpoint is no longer required here. The individual bobbin parameters of the yarn bobbins can be detected in a spatially separated manner at different measuring positions in order to then be assigned centrally to the yarn bobbins in a database. Thus, an efficient and cost-effective automated solution may be achieved.

Claims (16)

1. A method for checking wound bobbins in a melt spinning process or a yarn texturing process, wherein a plurality of bobbin parameters are detected in succession on one of the bobbins, and wherein the bobbin parameters of the individual bobbins are evaluated for quality assessment, characterized in that at least one of the bobbin parameters of the bobbins is determined while the bobbins are being transported away by a doffing device.

2. Method according to claim 1, characterized in that the lateral surfaces of the yarn bobbins are optically detected in sequence on the yarn bobbins while they are being transferred from the winding spindles of the winding machine to the support mandrels of the doffing device.

3. The method according to claim 1, characterized in that the outer surface of the yarn bobbin is optically detected after the yarn bobbin is transferred from the winding position of the texturing machine to the receiving device of the doffing device.

4. Method according to any one of claims 1 to 3, characterized in that further bobbin parameters of the yarn bobbin are detected at a plurality of further measuring positions which are designed to be distributed along the transport path of the yarn bobbin.

5. Method according to claim 4, characterized in that the end face is optically detected as one of the bobbin parameters when the bobbin is removed from the supporting mandrel of the doffer and/or when the bobbin is transferred from the doffer to a delivery device.

6. A method as claimed in claim 5, characterized in that the bobbin weight of the yarn bobbin is detected as one of the bobbin parameters by a weighing station during guidance in the transport device.

7. Method according to one of claims 1 to 6, characterized in that a plurality of measurement results generated at a measurement location are stored in a central database in the form of an identification code assigned to the yarn bobbin.

8. Method according to one of claims 1 to 7, characterized in that the bobbin parameters of the yarn bobbins are jointly analyzed by means of at least one analysis program.

9. Method according to any one of claims 1 to 8, characterized in that the yarn bobbins are sorted and packaged and/or sorted on the basis of a quality assessment and supplied to downstream further processing.

10. An inspection device for inspecting bobbins (6) in a melt spinning process or a yarn texturing process, having a plurality of measuring devices (11.1.-11.4) for detecting a plurality of bobbin parameters and having an evaluation unit (19), characterized in that one of the measuring devices (11.1-11.4) for detecting one of the bobbin parameters is fixed to a doffing device (8).

11. An inspection device according to claim 10, characterized in that the measuring means (11.1-11.4) are formed by a camera (12.1-12.3), which camera (12.1-12.3) is assigned to a support mandrel (9) of the doffing device (8) and/or to a receiving device of the doffing device.

12. Inspection device according to claim 10 or 11, characterized in that further measuring devices (11.1 "-11.4) are arranged distributed over a plurality of measuring positions (1,2,3) along the transport path of the yarn bobbin (6).

13. Inspection device according to claim 12, characterized in that a further camera (12.1-12.2) is provided, which further camera (12.1-12.2) is assigned to a transfer station (3) in which the yarn bobbin (6) can be transferred from the doffer device (8) to a conveying device (14).

14. The inspection device according to claim 12 or 13, characterized in that one of the measuring devices (11.1-11.4) is a scale (20), which scale (20) is assigned to a weighing station (3) of the conveyor device (14).

15. The examination apparatus according to any one of claims 10 to 14, characterized in that the measuring device (11.1-11.4) is connected to a central database (18) for storing bobbin parameters, wherein the central database (18) is assigned to the evaluation unit (19).

16. The inspection device according to any one of claims 10 to 15, characterized in that a sorting device (4) connected to the evaluation unit (19) is arranged at the end of the transport path.

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