WO2009127662A1

WO2009127662A1 - Method and apparatus for highly-precise determination of the instantaneous winding speed of a moving thread

Info

Publication number: WO2009127662A1
Application number: PCT/EP2009/054472
Authority: WO
Inventors: Ferdinand Josef Hermanns; Martin Linden
Original assignee: Vienco Gmbh
Priority date: 2008-04-15
Filing date: 2009-04-15
Publication date: 2009-10-22
Also published as: DE102008019012A1; WO2009127667A1

Abstract

The invention relates to a method for determining the instantaneous winding speed (v) of a moving thread (10) being wound onto a spool (1), wherein the thread (10) moves back and forth over a traverse range (11) during winding in successive traversing periods (17), said traverse range extending at least over part of the axial width of the spool (1). The method comprises the following process steps: determining, at least once, a speed profile (15) that indicates the instantaneous winding speed (v) of the thread (10) at least at individual points as a function of the instantaneous axial position (14) of the thread (10) within a traversing period (17), determining the instantaneous axial position (14) of the thread (10) within a traversing period (17) at least at individual points, determining the instantaneous winding speed (v) of the thread (10) from the instantaneous axial position (14) of the thread (10) within a traversing period (17) by way of the functionality established from the speed profile (15). The invention further relates to an apparatus suitable for carrying out this method.

Description

Method and arrangement for the highly accurate determination of the instantaneous winding speed of a running thread

The present invention relates to a method for highly accurate determination of the instantaneous take-up speed of a running yarn, with which it is wound on a spool so that it is reciprocated during winding in successive traversing periods on a so-called traversing range. The traversing region extends at least over a partial region of the axial width of the coil, but preferably over the entire width of the coil.

The method is used in textile machines for monitoring and / or optimization of the winding process, by means of which a coil, in particular a cross-wound bobbin, is produced by winding up a running thread or yarn. In contrast to other known methods for determining the speed of a running thread at an arbitrary yarn path of a textile machine, the method according to the invention does not determine the speed with which the thread is fed, but rather the winding speed of the thread, which due to the thread accelerations during the iridescent thread laying on the bobbin surface is subject to relatively high speed fluctuations. The velocity profile resulting from these variations can deviate up to +/- 40% from the average take-up speed.

While classical mechanical methods for speed measurement work with measuring wheels that roll on the running thread, non-contact measuring methods for determining the thread speed are known to avoid slippage and possible quality impairments of the thread. For example, from DE 42 25 842 A1 a device and a method for measuring the speed of textile threads on a winding device known to work according to the so-called correlation measurement method. DE 103 42 383 A1 discloses methods and arrangements which serve to determine the speed of a running thread in a contact-free manner on the basis of the laser Doppler anemometer method (LDA). The LDA method uses optical sensors that detect laser beams that are affected by the current thread. In addition, the light beam can be at least partially directed onto the thread and shadowed by it, wherein the non-shaded by the thread remaining portion of the light beam is directed to an optical detector whose signals are evaluated electronically to determine the diameter of the thread. An improvement of the LDA method with increased measurement volume is known, for example, from WO 2007/112980 A1.

Further methods and arrangements for determining the yarn quality and for monitoring and / or optimizing the quality of the winding process of the quality of a wound coil from the current thread are known from WO 2008/012093 A2. Thus, winding units of modern textile machines, for example for the production of cheeses, equipped with facilities for speed measurement and the length measurement of the current thread. Ever-increasing demands on the quality of the yarn have been made to monitor parameters of the yarn structure such as e.g. the yarn diameter not only at selected winding stations, but guided at each winding unit. When monitoring the yarn diameter, the length of the deviation is usually used to evaluate whether a deviation from the nominal yarn diameter is to be classified as a yarn defect. The determination of the exact defect length is therefore an essential part of the quality control of the yarn.

For quality assurance, so-called cleaner systems are also used which usually optically determine the diameter of the continuous thread and classify it according to certain criteria or classify it. For correct classification of the flaws requires the diameter detection system also the current length of a fault. So far, in the sense of the simplest possible structure and low cost only the determined over the drive drum of the coil Längeninkremente used (so-called "Conometer Methόde), but this prevents due to the attraction of a mean winding speed of the thread and due to slip phenomena exact length determination. In particular, the Conometer method does not capture the thread lengths accurately enough that actually results from the ever-changing accelerations of the thread as it moves back and forth to create the bobbin. The fluctuations in the take-up speed caused by these accelerations lead to relatively large fluctuations in the thread lengths wound up per period of time, so that the measurement results based only on a mean take-up speed of the thread can be associated with considerable inaccuracies here, which in turn leads to incorrect classification or not completely removed fault locations Can lead yarns.

Object of the present invention is therefore to provide an improved method of the type mentioned, which allows the determination of the current winding speed of a running yarn with a much higher accuracy and / or dynamics with relatively simple sensors at low cost. Furthermore, an arrangement for carrying out the method is to be provided.

This object is achieved by a method according to claim 1 and by an arrangement according to claim 26. Advantageous embodiments and modifications of the invention will become apparent from the dependent claims.

It is essential with the solution according to the invention that the method has at least the following steps: a velocity profile is determined at least once which indicates, at least at individual points, the instantaneous winding speed of the thread as a function of the instantaneous axial position of the thread within a traversing period,

- Subsequently, the highly accurate determination of the current

Winding speed determines the instantaneous axial position of the thread within a traversing period at least at individual points, and

From the thus determined instantaneous axial position of the thread within a traversing period is then by means of the. By the

Speed profile defined dependency determines the actual instantaneous winding speed of the thread.

By using the speed profile, which repeats periodically during the winding process, depending on the current axial position of the thread within its extending over the round trip period traversing the current winding speed of the thread even with simpler sensor systems with a be determined much higher accuracy than in the previously known methods. Thus, the instantaneous winding speed of a thread can be determined by the method according to the invention, for example, even with two relatively simple correlation sensors according to the correlation method as accurately as with the more expensive LDA method.

The term velocity profile here is understood to mean the dependence of the instantaneous winding speed of the thread from its current axial position within a traversing period. This profile or the course of this dependency may preferably map the speed as a function of time or path.

For particularly simple embodiments of the method according to the invention, it is sufficient for the determination to be carried out at least once of the velocity profile already to determine the dependence only at relatively few points within a traversing period. In the simplest case even a single point can be enough. Similarly, ^"the method for the subsequently throughput guided actual determination of the current wind-up speed is required for the instantaneous axial position of the yarn within a traverse period at relatively few points in particularly simple embodiments, wherein also in this case may be sufficient, a single measurement point in the simplest case. Nevertheless, even with these simpler method variants, a very precise determinability of the instantaneous winding speed of the thread is already achieved The axial position of the thread can be determined directly or indirectly, as will be described in more detail below.

Preferably, however, it is proposed to determine the dependence of the instantaneous winding speed of the thread from its current axial position within a traversing period at a plurality of points in the determination of the speed profile, whereby a much more differentiated course of the speed profile is obtained even greater accuracy and a higher dynamic in the determination of Fadenaufwickelgeschwindigkeit allows. Ideally, such a large number of points are taken into account that there is a continuous or quasi-continuous course of the dependence between the winding speed of the thread and its axial position within a traversing period.

In a corresponding manner, the accuracy and the dynamics in the determination of the winding speed can be increased by the fact that the instantaneous axial position of the thread within a traversing period, from which the instantaneous winding speed of the thread is determined by means of the dependency determined by the speed profile Variety of points is determined. The more points that are taken into account, the more pronounced is the increase in accuracy in determining the winding speed of the thread. It is also particularly advantageous if the velocity profile is determined such that it indicates the instantaneous winding speed of the thread as a relative deviation of the current winding speed of the thread from a mean winding speed of the thread as a function of the instantaneous axial position of the thread within a traversing period, wherein for determining the current winding speed, the current average winding speed of the thread is determined, from the thus determined current average winding speed of the thread on the one hand and the current axial position of the thread within a traversing period on the other hand by means of the dependency defined by the speed profile, the actual instantaneous take-up speed of the thread is determined. In this way, the high measurement accuracy and / or dynamics can be achieved even with variations in the mean take-up speed, which corresponds to the mean feed rate of the thread.

It is particularly favorable if the instantaneous take-up speed of the thread is determined continuously or quasi-continuously or at predetermined time intervals over a certain period of time, the instantaneous take-up speeds thus determined being summed up and the length of one during this time being calculated from this summation or integration taking into account the time span Time span wound portion of the thread is determined. Due to the highly accurate determination of the current winding speed can be done so a particularly accurate determination of the wound thread length.

In this case, preferably, the current diameter of the current thread continuously or quasi-continuously or at predetermined intervals are determined and compared with a fixed predetermined or adjustable nominal diameter, the duration of said period of time depends on how long the current diameter of the target diameter by a fixed specified or freely selectable minimum size deviates. This means that the said time span starts when the instantaneous diameter of the running thread deviates from the nominal diameter by the minimum dimension and that it ends again if the current thread diameter deviates from the nominal diameter only by less than the minimum dimension. In this way, the length of imperfections of the running yarn can thus be determined very precisely for improved granulation, so that the classification of the coil produced and / or per se known measures for eliminating the fault can be optimized.

Alternatively or additionally, the speed and / or length information obtained by the method according to the invention can also be used to increase productivity and / or to improve the quality of the winding process and of the coils produced. In this case, of course, known measures can be used, which provide for intervention in the winding process, for example the automatic change of certain process parameters or an interruption of the winding process and / or the generation of a signal upon fulfillment and / or deviation from predetermined criteria.

Advantageously, the velocity profile determined at least once is stored in a memory device, from which it can subsequently be read to determine the instantaneous winding speed of the thread, the velocity profile preferably being determined on the machine or installation on which the thread is also wound up. However, it is also possible to determine the speed profile on a reference machine and then make it available to similar machines or systems.

It is particularly advantageous if a plurality of speed profiles for different operating parameters or different operating points are determined and stored in a memory device, a speed profile being read out for the subsequent determination of the instantaneous takeup speed of the thread, which corresponds to the current operating parameters or the current operating point. In this way, a profile database, which is generated either on a reference machine or on the machine on which the thread is wound up.

In order to be able to determine the instantaneous take-up speed with the improved accuracy at the beginning of a new winding process, it is preferably proposed that the speed profile or profiles be or are determined in advance once before the beginning of the winding process. In a particularly simple embodiment variant of the method, the one-time determination of the velocity profile is sufficient. As long as no velocity profile is present, the average winding speed of the thread can first be used for further evaluations.

For a further increase in the measurement accuracy, it is particularly advantageous if at least one speed profile is determined repeatedly at certain intervals and stored in a memory device by overwriting such that the most recently determined latest speed profile is always read to determine the instantaneous winding speed of the thread. In this case, the velocity profile can advantageously also be determined continuously, ie continuously or quasi-continuously.

It is particularly advantageous if the velocity profile is at least then newly determined if at least one winding parameter, in particular the average winding speed of the thread or the yarn tension or the coil contact force or the coil support compensation changes.

According to a first preferred embodiment of the method according to the invention, it is proposed to determine the instantaneous winding speed of the thread for determining the speed profile via at least one highly dynamic, non-contact speed sensor. Preferably, the velocity profile can be determined by means of laser light, which is influenced and / or reflected by the thread, according to the above-mentioned LDA method. If the LDA method is used, it is particularly advantageous if the brush signal to be processed in the electronic evaluation of the LDA method is processed via a frequency-selective filter. The filter is set proportionally to the average winding speed of the thread, which corresponds to a certain forced operation of the selective filter. With a good burst signal, such forced operation is not necessary. However, if the burst signal of the LDA measurement becomes worse, in particular with a reduced signal-to-noise ratio, due to the material template, for example in the case of a particularly smooth yarn, advantageously the said forced operation of the selective filter can take place over the average speed signal in the short term , For example, this forced operation can take place until the signal-to-noise ratio of the burst signal increases again in quality. Regardless of the previously described inventive solution according to claims 1 to 11 can be easily used by this forced operation of the selective filter device, the LDA method even with very smooth yarns in which a good burst signal can not or hardly be detected. In this way, it is also possible to detect the speed of very smooth running threads with the LDA method.

According to a second preferred embodiment of the method according to the invention, it is proposed to determine the instantaneous winding speed of the thread for determining the velocity profile via at least two correlation sensors, the measurement series necessary for the correlation method being recorded highly dynamically and then mathematically correlated, preferably cross-correlated. This computation, which takes place offline in the background, requires a sufficiently large buffer memory due to the high computational effort. At the same time, the current phase relationship with the laying unit must be established, so that the position of the laying unit must also be stored when starting the recording. In order to be able to carry out the correlation method with unimpeded measurement accuracy with a lower computational effort and thus with a lower cost, it is further proposed for this purpose that the thread signals detected by the two correlation sensors are first transformed by a Fourier transformation into two complex signal spectra at least from parts of the two complex signal spectra by a complex conjugate multiplication a common complex data field is formed, that the common complex data field is transformed back by an inverse Fourier transform in the time domain, that a maximum of the in the time domain back transformed data field is determined, and that from the position of the determined maximum corresponding time shift and the distance of the two correlation sensors, the speed of the current thread is determined. By using the Fourier transform, the correlation no longer needs to be performed in the time domain, but can be done in the so-called frequency domain. Although the transformations carried out according to the invention initially seem to be a detour, in this way the number of multiplications required, in particular for larger data volumes, can be considerably reduced. As a result, the method according to the invention can be carried out not only faster, but above all with significantly less powerful processors and thus at significantly lower costs, which also makes economic use possible as a series application in textile machines.

Advantageously, in the correlation method, the determination of the current speed profile carried out offline is continuously continued and returned to the online measuring process after completion of a new speed profile. In this way, it is ensured that it is possible to respond quickly to an altered operating point caused, for example, by misguiding.

It is also particularly advantageous in the correlation method if, in a case where more than a maximum of the data field to be evaluated in this case is present over the average winding speed of the thread that maximum is determined from the position of the current winding speed of the thread is determined.

In addition, the latter method is also particularly advantageous in determining the speed of twisted yarns by means of the correlation method. Since the twisted yarn has a periodic structure, which is also detected by the correlation sensors, there are bound to be several maxima in the signal evaluation. In this case, the selection of the correct maximum with the aid of the mean winding speed, as a particular advantage, even extends the possible uses of the previously known correlation measurement methods with which twisted yarn can not be correctly detected for reasons of periodicity.

If the movement of the thread is achieved by means of a traversing element which can be moved back and forth in front of the spool, it is particularly advantageous, if the instantaneous axial position of the thread is determined within the traversing period, in which the instantaneous position of the traversing element his is detected over a traversing period extending to and fro.

In a particularly preferred embodiment of the method according to the invention, in which the reciprocating movement of the thread over the traversing area is achieved by a groove drum driving the spool, it is particularly advantageous if the instantaneous axial position of the thread within the traversing Period over the instantaneous angular position of the grooved drum, which this momentarily within the over a traversing period extending revolutions of the grooved drum, is determined. Advantageously, the angular position of the grooved drum can be determined by means of a pulser or incremental sensor connected to the grooved drum. The speed profile of the running thread detected via a suitable speed sensor can be detected and stored as a function of the drum angle. This is the dynamic Yarn velocity profile of the current operating point depending on the drum angle. This profile can then be used to carry out the method according to the invention, by depending on the drum angle or from the instantaneous position, which occupies the grooved drum within the belonging to a traversing period number of revolutions, the corresponding profile value for the highly accurate determination of the current Winding speed is used.

Of particular advantage is further that the grooved drum is also used for the drive of the coil, so that on the detection of the positions or the speed of the grooved drum and the average winding speed of the yarn can be determined, so that no additional sensor needed for this becomes (Conometer method).

A particularly precise embodiment of the method according to the invention is obtained when at least occasionally determines the actual instantaneous feeding speed of the thread and thus a phase control for monitoring the synchronicity of the velocity profile derived from the instantaneous axial position of the thread within the traversing period on the one hand with the actual instantaneous velocity profile of the thread on the other hand is performed. In this case, the actual feed speed of the thread can be detected in particular with the highly dynamic speed sensor or with the correlation sensors, which are also used in the course of the previous determination of the speed profile for detecting the instantaneous winding speed of the thread. By a phase control, which can be performed either only sporadically or continuously or at given periods, changes in the reference between the velocity profile used on the one hand and the current axial position of the thread or the angular position of the grooved drum can be detected on the other hand, especially in process disturbances , For example, may occur due to Garnfehlführungen. For the detection of the current phase position of the velocity profile, the axial position of the thread can be determined particularly easily when using a traversing element. However, provided that the cross-winding the yarn on a bobbin, the driving ^{^} grooved drum is achieved, the phase control is carried out advantageously by means of at least one position sensor, which is arranged in the traversing triangle and detects the actual axial position of the thread.

In the simplest case, the phase control is used only for monitoring purposes. However, it is particularly advantageous if a phase synchronization is carried out if a predetermined or specifiable minimum change in the phase position is detected. Thus, the profiles can be used in a significant change in the phase position again in agreement.

It is furthermore particularly advantageous if, for at least a certain period of time instead of the instantaneous winding speed of the thread, which results from the instantaneous axial position of the thread within a traversing period and the dependence determined by the speed profile, the average winding speed or the feeding speed the thread is used for further evaluation, for example for determining the length of the thread or a thread section, if a predetermined or specifiable minimum phase shift is detected. In this case, a plausibility check based on the phase control is performed for the use of the data for the current winding speed of the thread for further control or evaluation purposes.

Another possibility for a plausibility check is that for at least a certain period of time instead of the instantaneous winding speed of the thread, which results from the current axial position of the thread within a traversing period and the dependency determined by the speed profile, the average winding speed is of the yarn for further evaluation, for example to determine the length of the thread or portion of thread used, if the average winding speed of the yarn is deviated by a predetermined or predeterminable minimum amount of the ^"through the highly dynamic, non-contacting speed sensor certain current take-up speed of the yarn.

Both possibilities of the aforementioned plausibility checks the effects of possible errors in the determination of the current winding speed of the thread can be minimized, the replacement average winding speed of the thread used especially when using a drum for driving the coil are particularly easily and safely detected by pulse or incremental sensors can.

The present invention further relates to an arrangement for carrying out a method of the type described above. An arrangement according to the invention for determining the instantaneous winding speed of a running thread advantageously comprises a memory device in which at least one speed profile can be stored, means for determining the axial Position of the thread, as well as an evaluation unit, by means of which the instantaneous winding speed of the thread can be determined on the basis of the speed profile and the axial position of the thread.

Further advantages and features of the invention will become apparent from the following description and the embodiments illustrated in the drawings. Show it:

Figure 1: Schematic representation of a conical coil on which a thread is wound; and

Figure 2: Schematic representation of a velocity profile used in the invention. The spool 1 shown in FIG. 1 is driven in rotation by a rotating grooved drum 3 provided with grooves 2. The coil 1 is here with a smaller diameter 4 ^{~ of} the left in Figure 1 lying end face 5 and a larger diameter 6 of the right end face 7 conical, so that the axis of rotation 8 of the coil 1 at an angle obliquely to the axis of rotation 9 of the grooved drum. 3 runs.

During rotation of the spool 1, a continuously supplied thread 10 is wound onto the spool 1 in such a way that it is moved back and forth over a traversing region 11 which extends between the two end faces 5 and 7 over the entire width of the spool 1. The traversing movement of the thread 10 is caused in a conventional manner by the grooves 2 introduced on the grooved drum 3. The thread oscillates about a stationary in front of the grooved drum 3 guide point 12 by a traversing angle α back and forth. In this way, a so-called traversing triangle 13 is formed between the guide point 12 and the coil 1.

A traversing period comprises a complete way and a complete return path of the thread 10 via the traversing region 11, so that the thread 10 is again exactly at the same position after exactly one traversing period. This means that, starting from the instantaneous axial position 14 shown in FIG. 1, the thread 10 is again at the axial position 14 after a traversing period has elapsed.

FIG. 2 shows, by way of example, a velocity profile 15, which results from the fluctuations in the take-up speed v caused by the traversing movements of the thread 10. It can be seen that the individual winding speeds v of the thread 10 deviate by up to +/- 40% from the mean winding speed 16, which in the illustrated example is 1000 m / min. The speed profile 15 reaches a maximum value of about 1270 m / min and a minimum value of about 650 m / min. The number of revolutions of the grooved drum 3 and thus also the phase angle of the grooved drum 3 over a traversing period 17 depends on the so-called mobility of Nutentrbmmel 3 from. The diagram illustrated by way of example in FIG. 2 reproduces, for example, the velocity profile in the case of a grooved drum 3, which requires exactly four complete drum revolutions in order to oscillate the yarn 10 once over the entire oscillating region 11. The over a traversing period 17 extending phase angle φ of the grooved drum 3 is 8π.

It can clearly be seen here that the profile of the velocity profile 15 repeats identically after the completion of a traversing period 17. The velocity profile 15 repeats itself constantly in unchanged form, as long as no disturbances of the winding process, for example, due to miscarriages of the thread 10 occur. Therefore, with knowledge of the velocity profile 15 by executing the method according to the invention in dependence on the instantaneous phase angle φ of the grooved drum 3, the speed v at which the thread 10 is currently wound on the spool 1 can be determined. Each instantaneous phase angle φ of the grooved drum 3 corresponds to a momentary axial position 14 of the thread 10 within a traversing period 17. The determination according to the invention of the instantaneous winding speed v of the thread 10 is - as can easily be recognized - much more accurate than a determination of the constant mean take-up speed 16 of the thread 10.

Claims

claims

Method for determining the instantaneous take-up speed (v) of a running thread (10) which is wound onto a bobbin (1), the thread (10) being wound up in successive traversing periods (17) via a traversing area (11) moving back and forth over at least a portion of the axial width of the spool (1), comprising the following process steps:

At least once, a velocity profile (15) is determined which indicates the instantaneous take-up speed (v) of the thread (10) as a function of the instantaneous axial position (14) of the thread (10) within a traversing period (17), at least at individual points .

the instantaneous axial position (14) of the thread (10) within a traversing period (17) is determined at least at individual points,

- From the current axial position (14) of the thread (10) within a traversing period (17), the current winding speed (v) of the thread (10) is determined by means of the speed profile (15) determined dependence.

2. Method according to claim 1, wherein at least once a velocity profile is determined which determines the instantaneous winding speed of the thread as a function of the instantaneous axial position of the thread within a

Indicates traversing period (17), wherein preferably the velocity profile (15) is determined at a plurality of points such that an at least approximately continuous course of the dependence is determined.

3. The method according to claim 1 or 2, characterized in that the instantaneous axial position (14) of the thread (10) within a traversing period (17) at a plurality of points, preferably at least approximately continuously determined.

4. Method according to one of claims 1 to 3, characterized in that the velocity profile (15) is determined such that it determines the instantaneous winding speed (v) of the thread (10) as relative deviation of the instantaneous winding speed (v) of the thread

Thread (10) from a mean winding speed (16) of the thread (10) in dependence on the current axial position (14) of the thread (10) within a traversing period (17) indicates, and that for determining the current winding speed (v ), the current average take-up speed (16) of the thread (10) is determined, wherein from the thus determined current average take-up speed (16) of the thread (10) on the one hand and the current axial position (14) of the thread (10) within a traversing Period (17) on the other hand by means of the speed profile (15) fixed dependence of the current winding speed (v) of the thread (10) is determined.

5. Method according to one of the preceding claims, characterized in that the instantaneous winding speed (v) of the thread (10) is determined continuously or at predetermined time intervals over a certain period of time, and that of the instantaneous values thus determined Winding speeds (v) by summation and taking into account the length of the length of a wound during this period portion of the thread (10) is determined.

6. The method according to claim 5, characterized in that the instantaneous diameter of the running thread (10) is determined continuously or at predetermined time intervals and compared with a nominal diameter, and that the duration of said period of time depends thereon long, the current diameter of the nominal diameter deviates by a predetermined or specifiable minimum size.

7. Method according to one of the preceding claims, characterized in that the velocity profile (15) is stored in a memory device from which it is read for determining the instantaneous winding speed (v) of the thread (10) the speed profile (15) is preferably determined on the machine or system on which the thread (10) is wound up.

8. Method according to one of the preceding claims, characterized in that a plurality of speed profiles (15) for different operating parameters or operating points are determined and stored in a memory device, and that for determining the instantaneous winding speed (v) of the thread (10 ) a speed profile (15) corresponding to the current working parameters is read out.

9. Method according to one of claims 7 or 8, characterized in that at least one velocity profile (15) is determined once in advance before the start of a winding process.

10. The method according to any one of claims 7 to 9, characterized in that at least one speed profile (15) repeatedly determined at certain intervals and stored in a memory device such that for determining the instantaneous winding speed (v) of the thread (10) always the last determined speed profile (15) is read out.

11. The method according to claim 10, wherein the velocity profile is determined again at least when at least one winding parameter, in particular the mean winding speed of the thread, or the thread tensile force or the coil contact force changes.

12. Method according to one of the preceding claims, characterized in that the instantaneous take-up speed (v) of the thread (10) for determining the velocity profile (15) is determined via a highly dynamic, non-contact speed sensor.

13. The method according to claim 12, characterized in that the instantaneous winding speed (v) of the thread (10) for

Determining the velocity profile (15) by means of laser light, which is influenced and / or reflected by the thread (10), determined by the laser Doppler anemometry method.

H. A method according to claim 13, characterized in that in the evaluation of the laser Doppler anemometry method to processing burst signal is processed via a frequency-selective filter, wherein the filter is set in proportion to the average winding speed (16) of the thread (10).

15. The method according to any one of claims 1 to 11, dadu rc hgekennzeichnet that the instantaneous take-up speed (v) of the thread (10) for determining the velocity profile (15) via at least two correlation sensors is determined, wherein the necessary for the correlation method measurement series highly dynamically recorded and then correlated, in particular cross-correlated.

16. The method according to claim 15, dadu rc hgekennzeichnet that the detected by the two correlation sensors yarn signals are first transformed by a Fourier transform into two complex signal spectra that at least from parts of the two complex signal spectra by a complex conjugate multiplication a common Complex data field is formed, that the common complex data field is transformed back by an inverse Fourier transform in the time domain, that a maximum of the in the time domain back transformed data field is determined, and that of the position of the determined maximum corresponding time shift and the distance of the two correlation sensors, the speed (v) of the current thread (10) is determined.

17. The method according to claim 15 or 16, characterized in that at several maxima of the data field to be evaluated in the correlation method by means of the average winding speed of the thread (10) that maximum is selected from the position of the instantaneous take-up speed (v) of the thread (10) is determined ,

18. Method according to one of the preceding claims, characterized in that the traversing of the thread (10) via a front the coil (1) reciprocable traversing element is achieved, wherein the instantaneous axial position (14) of the thread (10) is determined via the instantaneous position of the traversing element on its over a traversing period (17) extending path.

19. Method according to one of claims 1 to 17, characterized in that the traversing of the thread (10) is achieved by means of a grooved drum (3) driving the spool (1), wherein the instantaneous axial position (14) of the thread (10) is determined by the angular position (φ), which the grooved drum (3) of the over a traversing period

(17) currently occupies extending revolutions.

20. A method according to claim 19, wherein the angular position (φ) of the grooving drum (3), which currently occupies the same within the number of revolutions belonging to a traversing period (17), by means of a pulse drum or incremental sensor connected to the grooved drum (3).

21. Method according to one of the preceding claims, characterized in that at least from time to time the actual instantaneous winding speed (v) of the thread (10) is determined, and that a phase control for monitoring the synchronicity of the the instantaneous axial position (14) of the thread (10) derived speed profile (15) with the actual instantaneous speed profile (15) is performed.

22. The method according to claim 21 in combination with one of the claims 19 or 20, wherein the phase control is carried out by means of at least one position sensor, which is arranged in the traversing triangle (13) and the actual axial

Position of the thread (10) detected.

23. The method according to claim 21 or 22, wherein a phase synchronization is performed when a predetermined or specifiable minimum change in the phase angle is detected.

A method according to any one of claims 21 to 23, characterized in that, for at least a certain period of time, instead of the instantaneous take-up speed (v) of the thread (10) resulting from its instantaneous axial position (14) and velocity profile (15), the average take-up speed (16) of the thread (10) is further used when a predetermined or predeterminable minimum change in the phase position is detected.

25. The method according to any one of claims 12 to 17, in particular in combination with one of claims 18 to 24, characterized in that at least for a certain period of time instead of the instantaneous winding speed (v) of the thread (10) resulting from its current axial position (14) and the velocity profile (15), the average winding speed (16) of the thread (10) is used when the mean winding speed (16) of the thread (10) by a predetermined or predeterminable minimum amount by the by the highly dynamic, non-contact working speed sensor certain instantaneous winding speed (v) of the thread (10) deviates.

26. Arrangement for carrying out the method according to one of the preceding claims, comprising a memory device, in which at least one velocity profile (15) can be stored, means for determining the axial position (14) of the thread (10), and an evaluation unit, by the basis of the velocity profile (15) and the axial position (14) of the

Thread (10) the instantaneous winding speed (v) of the thread (10) can be determined.