WO2019170673A1 - Test method and test apparatus for analysing a wound thread package - Google Patents

Abstract

The invention relates to a test method and a test apparatus for analysing a wound thread package. Here, a thread (2) is taken continuously off the thread package and, in parallel with the taking off of the thread, at least one package parameter and/or take-off parameter is measured. In order to determine the influence of the thread lay within the thread package during taking off, according to the invention, an image of a lateral surface (3) of the thread package is recorded as a package parameter by a camera (7.1) To this end, the measuring device has a camera, which is directed at a lateral surface of the thread package.

Description

 Test method and apparatus for analyzing a wound bobbin

The invention relates to a test method for analyzing a wound yarn package according to the preamble of claim 1 and to a test apparatus for analyzing a wound yarn package according to the preamble of claim 9.

A generic test method and a generic test device for analyzing a wound bobbin proceed from JP 2000-191238 A2 ago.

In the production and further processing of threads, these are usually wound up into thread bobbins for intermediate storage. The thread bobbins are then used in a subsequent process to provide the thread, in order to be able to carry out further processing, for example. Thus, for example, the synthetic threads produced in a melt spinning process are wound up at the end of the melting process into thread bobbins, which are then used as supply bobbins in a texturing process for texturing the thread. Insofar, the filament is deposited when a filament bobbin is wound in such a way that it can be pulled off from the filament bobbin as uniformly as possible and with a constant filament tension in a subsequent process. To optimize the winding of the thread bobbins with a view to further processing and deduction of the threads, it is customary to check the wound bobbins in their deduction behavior. In the known from JP 2000-191238 A2 test method and Prüfvorrich device for analyzing a bobbin, the bobbin for pulling the yarn is driven at a predetermined peripheral speed, wherein the yarn is continuously taken up by an extraction and removed. The thread is pulled tangentially from the bobbin, with the thread of the thread is detected by a sensor. However, such position determinations of the thread running from the bobbin surface are only of limited suitability in order to be able to detect and evaluate the yarn deposit on the circumference of the bobbins. In particular, so-called image windings when unwinding the thread bobbins lead to flow disturbances. The image windings, which are also referred to as mirrors, always arise when the coil diameter increases if one or more complete spool revolutions occur per double stroke of a traverse, ie if the ratio of the speed of the yarn spool to the double stroke frequency of the traversing device = 1, an integral multiple or an integral break. As a double stroke while a complete reciprocating motion of the traversing yarn guide is called for laying the thread.

It is an object of the invention to further develop the generic test method and the generic test apparatus for analyzing a wound yarn bobbin that the thread layers wound on the circumference of the bobbin and in particular the image windings occurring can be detected.

This object is achieved with a test method in that is detected as a coil parameters, an image of a mantle surface of the bobbin with a camera.

For the test device according to the invention, the solution results from the fact that the measuring device has a camera which is directed onto a mantle surface of the yarn package.

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

The invention has the particular advantage that the thread layers lying on the mantle surface are detected directly before the thread is withdrawn. the. Thus, a visual appearance of the coil surface can be detected and analyzed. For this purpose, the measuring device has a camera which is aligned with the mantle surface of the thread bobbin. Thus, for example, one or more photocells can be used to take images of the lateral surfaces with the respective characteristic thread trays. Thus, the actual state of Fa denablagen on the circumference of the coil is detected and evaluated in terms of misfeeds off.

Here, the development of the invention is particularly advantageous, in which a coil diameter of the thread bobbins is measured as a further coil parameters. Thus, the diameter of the bobbin of the bobbin when the thread is removed changes continuously and thus also the thread trays which are visible on the mantle surface. In that regard, a deposit pattern of the mantle surface of the bobbin as a function of the respective spool diameter can be detected and evaluated with the image.

For detecting a coil diameter of the bobbin, the Messeinrich device on a distance sensor, which is connected together with the camera with a Bildana lysis unit. Thus, the image of the deposition patterns generated by the camera can be analyzed as a function of the respective coil diameter. In addition to the thread tray, the coil width and the coil shape can be detected. This allows unwanted bulges of Fadenspu le or so-called Abschläger the thread on the coil edge of the bobbin erfas sen.

In order to share the uniformity of the thread windings and thus a package density beur, according to an advantageous embodiment of the invention seen before, that a coil weight of the bobbin and a withdrawal length of the thread is detected as a further coil parameters. For this purpose, the measuring device has a scale for measuring a bobbin weight of the thread coil, wherein the balance is integrated in the receiving device and is connected to a measuring electronics unit. This makes it possible to detect a package density via the weight decrease of the thread bobbin during the removal of the thread and the bobbin diameter. Moreover, by a relation of the coil weight of the thread bobbin to a withdrawal length of the thread additionally a thread titer can be determined.

To determine the deduction length of the thread, the trigger device preferably before a godet unit with a driven godet and a Absau tion, wherein a drive of the godet is connected to the measuring electronics unit and wherein the measuring electronics has a timer. Thus, a defi ned withdrawal speed can be adjusted by the drive of the godet. With a slip-free deduction of the thread can thus be calculated using a pull-off time and the withdrawal speeds advantageous deduction length of the thread.

Thus, the results obtained in the analysis of the wound bobbin results can be used directly to improve the textile processes, the thread is pulled off according to an advantageous embodiment of the invention axially from the fixed yarn bobbin of the godet and taken up by a suction. Such an axial withdrawal of the thread from the thread bobbin corresponds to the ratio in a further processing process. Here, the Fadenspu len are held to several on a godet frame.

As a further deduction parameter is a yarn tension in a Fadenab section of the thread between the godet and one of the yarn package axially zugeord Neten yarn guide of the bobbin measure. In this way, irregularities in the thread withdrawal can be related directly to the parallel recorded and formed unloading patterns of the mantle surface of the thread bobbin. For this purpose, the receiving device has a Aufsteckdom and a spaced apart from the Aufsteckdom axially aligned thread guide, so that the thread is axially removable from the thread bobbin. In addition to a yarn tension sensor, the measuring device furthermore has a lint sensor in order to measure the number of lint on the yarn as a further quality feature. This development of the invention is particularly suitable for syn thetic threads, which consists of a plurality of filaments. Each bmch in one of the filaments produces filament ends which emerge from the filament composite and are thus recognized as so-called lint.

In order to simulate as possible a state occurring during the further processing of a thread de, the thread take-off is preferably at a Abzuggeschwindig speed in the range of 800 m / min. up to 1,500 m / min. deducted from the bobbin. This area covers most of the finishing processes in which a Fa is subtracted from a supply spool, for example during texturing.

In order to monitor the removal of the thread from the thread bobbin, it is further provided that a thread bmchsensor for monitoring the thread is arranged between the godet unit and the suction. This essentially checks the presence of the thread.

The test method according to the invention and the test device according to the invention are therefore particularly suitable for improving both the winding of thread bobbins and the removal of bobbins with regard to uniformity. The interactions between the winding of the coil and the withdrawal of the coil can be advantageously determined in this case in particular by the image analysis. The test method for analyzing a wound bobbin will be explained in more detail below with reference to some embodiments of the test device according to the invention with reference to the accompanying figures.

They show:

Fig. 1 shows schematically a view of a first embodiment of inventions to the invention test device for analyzing a wound bobbin Fig. 2 is a schematic view of another embodiment of the inventions to the invention test device for analyzing a wound bobbin

FIG. 1 schematically shows a view of a first exemplary embodiment of the test device according to the invention for analyzing a yarn package. The embodiment has a coil receiving device 5, a deduction device 6, a measuring device 7 and an evaluation computer 8. The bobbin receiving device 5 is used to hold a bobbin 1. For this purpose, the bobbin 1 is attached to a support sleeve 4 on a Aufsteckdom 5.1. The Aufsteckdom 5.1 is cantilevered to a support frame 5.2 held. The bobbin 1 is held firmly on the Aufsteckdom 5.1, the bobbin 1 is held at a distance freely in the environment.

To pull off a thread 2 from the bobbin 1, the draw-off device 6 has a godet unit 6.1. The godet unit 6.1 is formed by a drive ne godet 6.2 and a freely rotatable guide roller 6.4. The godet 6.2 is associated with a drive 6.3. The deflection roller 6.4 is freely rotatable, so that a run on the godet unit 6.1 thread 2, the godet 6.2 and the guide roller 6.4 wraps around several times.

The godet unit 6.1 is associated with a thread guide 6.6, which is located at a height of the Aufsteckdomes 5.1 and at a distance from a free end of the Aufsteckdomes 5.1 is held. The thread 2 is thus withdrawn axially from the thread bobbin 1. For this purpose, the yarn guide 6.6 preferably has a guide eye.

On a drain side of the godet unit 6.1 is associated with a suction 6.5. The suction 6.5 is connected via a hose line (not shown here) with a waste container.

In this exemplary embodiment, the measuring device 7 has a camera 7.1, which is held at a distance from a jacket surface 3 of the thread bobbin 1. The camera 7.1 is connected to an image analysis unit 7.3. In addition to the camera 7.1, a distance sensor 7.2 is arranged, which detects the relevant mantle surface 3 in order to detect a coil diameter of the yarn package 1. The distance sensor 7.2 is preferably designed by a laser distance sensor. The distance sensor 7.2 is also connected to the image analysis unit 7.3.

In a region between the yarn guide 6.6 and the godet unit 6.1, the measuring device 7 has a yarn tension sensor 7.4 and a lint sensor 7.5. The thread tension sensor 7.4 and the lint sensor 7.5 are coupled to a measuring electronics unit 7.7. The measuring electronics unit 7.7 is also connected to the drive 6.3 of the godet unit 6.1.

To monitor the yarn withdrawal from the yarn package 1 is between the Galet teneinheit 6.1 and the suction 6.5 a yarn breakage sensor 7.6 is provided. The yarn break detector 7.6 is also coupled to the electronic measuring unit 7.7.

For evaluation of the measurement signals, the measurement electronics unit 7.7 and the image analysis unit 7.3 are connected to an evaluation computer 8. In this case, the evaluation computer 8 can preferably also be combined with an output device for documenting. In the test apparatus shown in Fig. 1, a thread bobbin 1 is first attached to the Aufsteckdom 5.1 of Spulenaufhahmeeinrichtung 5. At closing a thread 2 of the bobbin 1 is threaded into the yarn guide 6.6 and the sensors 7.4 and 7.5 and applied to the godet unit 6.1. The Ga letteneinheit 6.1 is activated to continuously withdraw the thread 2 from the bobbin 1 and discharged through the suction 6.5. The galette 6.2 is driven by the drive 6.3 with a predetermined by the measuring electronics unit 7.7 to catch speed. Thus, the thread 2 is preferably at a withdrawal speed in the range of 800 m / min. up to 1,500 m / min. withdrawn axially from the thread bobbin 1.

For analysis of the yarn package, the mantle surface 3 of the yarn package 1 is detected by the camera 7.1. In this case, one or more images of deposition patterns of the thread on the mantle surface 3 can be generated and supplied by the camera to the image analysis unit. In parallel, the mo mentane bobbin diameter is detected by the distance sensor 7.2 and also supplied to the image analysis unit 7.3. In that regard, each coil diameter of the thread bobbin 1 is assigned to at least one deposition pattern of the thread on the mantle surface 3.

In the image analysis unit, the images of the deposition patterns are analyzed with respect to irregularities and in particular with regard to image windings. In addition, the coil width and the coil shape are evaluated. The measurement data are then fed from the image analysis unit to the evaluation computer 8. Here, in the evaluation computer 8, a separate representation of the deposition pattern or a link with other measurement data of coil parameters and / the Abzugsparametem done.

In addition to the visual acquisition of measured data, a thread tension when removing the thread 2 from the thread coil 1 continuously measured by the thread tension sensor 7.4. The measuring signals are fed to the electronic measuring unit 7.7. In addition, the quality of the thread is monitored via the lint sensor 7.5. In this case, advantageously, a number of lint per unit time or per unit length of the withdrawn yarn is detected and fed to the measurement electronics unit. As lint are to be evaluated as occurring on the thread filament breaks.

The measurement data obtained by the yarn tension sensor 7.4 and the lint sensor 7.5 are supplied to the evaluation computer 8 by the measurement electronics unit 7.7. Within the evaluation computer 8 at least one or meh rere evaluation programs are stored, which combine, for example, the visual Messda th with the physical measurement data. So conclusions about possible causes of thread tension fluctuations can be found out. For example, a picture winding or a so-called stripper at the edge of the coils leads to an uneven thread tension. This information about interactions is particularly advantageous in order to improve both the winding process during winding of the bobbin and the subsequent withdrawal process in the further processing of the thread. In the visual Messdatenerfas solution by the camera 7.1 also the flow behavior of the yarn from the mantle surface 3 of the yarn package 1 can be observed. The effects of image windings and decoys on the run-off behavior of the thread are thus immediately visible.

In the exemplary embodiment illustrated in FIG. 1, the measurement data are supplied to the evaluation computer 8 via a network. However, this network can also advantageously be realized by a wireless connection.

2, a further embodiment of the device according to the invention Prüfvor for analyzing a yarn package is shown schematically in a view. The exemplary embodiment is essentially identical to the abovementioned embodiment. Example, so that only the differences are explained below and otherwise reference is made to the above description.

In the exemplary embodiment of the inventive test device for analyzing a yarn package shown in FIG. 2, the measuring device 7 additionally has a scale 7.8. The balance 7.8 is integrated in the receiving device 5 in such a way that a package weight and thus a weight loss of the thread bobbin 1 during the removal of the thread 2 from the thread bobbin 1 is detected. The balance 7.8 is coupled to the measuring electronics unit 7.7. The electronic measuring unit 7.7 has a timer 7.9, which determines a withdrawal length of the thread 2 from the predefined Umfangsge speed of the godet 6.2. Thus, a weight loss of the bobbin 1 with a deduction length of the thread 2 bring in relation to determine a yarn titer. The measurement data are supplied to the evaluation computer 8 by the measurement electronics unit 7.7. In the evaluation computer 8, the bobbin weight of the bobbin can also be related to the respective bobbin diameter. In addition, it is possible to determine a coil density of the bobbin 1. Here, the uniformity of the coil density over the entire increase of the coil can be checked.

The test method according to the invention and the test device for analyzing a thread bobbin according to the invention are therefore suitable for determining information about the game characteristics, coil geometry, coil deformation, take-up settings including mirror interference for avoiding image windings and drainage behavior. In this case, the evaluation computer may have a number of measurement programs in order to determine the supplied measurement data of the coil parameters, such as, for example, the images thread layer, the package weight, the package diameter and / or the withdrawal parameter such. To evaluate and analyze the thread tension, the number of fluff.

Claims

 claims 1. A test method for analyzing a wound yarn package, in which a yarn is continuously withdrawn from the yarn package and in which at least one coil parameter and / or a withdrawal parameter is measured parallel to the removal of the yarn, characterized in that lenlen as a coil image of a mantle surface the bobbin is detected with a camera. 2. Test method according to claim 1, characterized in that a coil diameter of the bobbin is measured as a further coil parameters and that a deposition pattern of the mantle surface of the bobbin is detected in dependence speed of the respective bobbin diameter and evaluated. 3. Test method according to claim 2, characterized in that a coil width of the mantle surface of the bobbin as a function of the spool diameter is detected and evaluated. 4. Test method according to one of claims 1 to 3, characterized in that as a further coil parameters, a coil weight of the thread bobbin and a withdrawal length of the thread is detected as a deduction parameter. 5. Test method according to claim 4, characterized in that the coil weight of the thread bobbin is evaluated in a relation to the withdrawal length of the thread for determining a Fadentiters. 6. Test method according to one of the preceding claims, characterized in that the thread is moved axially from the stationary thread bobbin by means of an ner godet pulled off and taken by suction and that as a further deduction parameter a yarn tension in a thread section of the yarn between the godet and one of the yarn package axially associated yarn guide he yarn bobbin is measured. 7. Test method according to claim 6, characterized in that a number of lint is measured on the thread portion of the Fa dens between the galette and the thread guide as a further deduction parameter. 8. Test method according to one of claims 1 to 7, characterized in that the thread is withdrawn at a withdrawal speed in the range of 800 m / min to 1500 m / min from the yarn package. Test device for analyzing a wound bobbin (1), with a coil receiving device (5), with a thread withdrawal device (6) and with a measuring device (7), characterized in that the Messein direction (7) has a camera (7.1) on a jacket surface (3) of the thread bobbin (1) is directed. 10. A test device according to claim 9, characterized in that the measuring device (7) for detecting a coil diameter of the yarn package (1) has a distance sensor (7.2) and that the camera (7.1) and the distance sensor (7.2) with a Image analysis unit (7.3) are connected. 11 testing device according to claim 9 or 10, characterized in that the measuring device (7) has a balance (7.8) for measuring a bobbin weight of the thread bobbin (1), wherein the balance (7.8) in the Aufnahmeein device (5) is integrated and with a Messelektronikeinheit (7.7) verbun is the. 12. A test apparatus according to claim 11, characterized in that the draw-off device (6) has a godet unit (6.1) with a driven Galet te (6.2) and a suction (6.5), wherein a drive (6.3) of the Ga lette (6.2 ) is connected to the measuring electronics unit (7.7) and wherein the measuring electronics unit (7.7) has a timer (7.9). 13. Testing device according to one of claims 9 to 12, characterized in that the receiving device (5) has a freely projecting Aufsteck dom (5.1) has a spaced axially aligned yarn guide (6.6) is zugordnet. 14. Testing device according to one of claims 9 to 13, characterized in that the measuring device (7) has a thread tension sensor (7.4) and ei ne Flusensenor (7.5), in a region between the galette unit (6.1) and the yarn guide ( 6.6) are arranged. 15. Testing device according to one of claims 12 to 14, characterized in that between the godet unit (6.1) and the suction (6.5) a thread breakage sensor (7.6) is arranged to monitor the thread.