EP1161396B1 - Method and device for winding a yarn bobbin - Google Patents

Abstract

The invention relates to a method and a device for winding a yarn bobbin (6). According to said method, an in-running thread (1) is guided back and forth using a traversing thread guide (3) within a traversing stroke and is deposited on the yarn bobbin (6). To avoid the formation of high ridges on the bobbin, the traversing stroke of the traversing thread guide can be modified in length within the breadth of the yarn bobbin, during the winding process. The modifications to the length of the traversing stroke take place during the travel of the bobbin according to a predetermined respiration function (Z). According to the invention, the respiration function (Z) is determined from a mass distribution (F) of the thread on a theoretically wound, ideal yarn bobbin in such a way that a predetermined bobbin density of the yarn bobbin can be created.

Description

The invention relates to a method for winding a bobbin according to the Preamble of claim 1 and a device for performing the Method according to the preamble of claim 11.

The method and the device are from EP 0 235 557 (Bag. 1509) known.

When winding a thread into a thread spool, the thread is inside the Spool width at a substantially constant peripheral speed Thread spool with a variable crossing angle on the surface of the spool stored. For this purpose, the thread is passed through a traversing thread guide before the baffle to the coil surface within a traversing stroke back and forth. Around an even mass distribution of the thread and thus an even It is necessary to maintain the density of the coil, especially in the edge areas of the coil known to shorten the traversing stroke cyclically during winding and to extend. These changes in length of the traverse strokes are called so-called breathing. Breathing creates a high edge build-up (Saddle formation) of the coils prevented.

In the method known from EP 0235 557, the length is changed the traverse strokes according to a given breathing function. Here is the Breathing function defined by the time period that is needed to Length of the traverse stroke that was set before breathing increased again to reach. Thus, the breathing function is achieved through several breaths formed, which is a reciprocating movement of the traversing thread guide Define changed traverse stroke length. When going through one Breathing function is the thread in many breaths on the Coil surface deposited. Due to the breathing function, the distribution of the Reversal points of the traversing thread guide or the thread on the Coil surface defined at the coil ends. Thus, by default the breathing function directly affects the mass distribution of the thread.

Since the breathing function in the known method is based solely on empirical The problem is that there is a change in the mass distribution on the wound bobbin also only based on experience is changing.

Another method is known from US 4,771,960, in which the Breathing function cause random changes in length of the traversing stroke. There is a distance between the outermost reversal point and the innermost one Reversal point, each by the longest traversing stroke and the shortest Traversing stroke are defined, divided into a variety of points. Everyone who Points represents a reversal point of the traversing thread guide Order and frequency of how the individual reversal points were approached are determined according to a specific algorithm based on the principle of Randomly based. This known method is therefore also completely unsuitable by a predetermined mass distribution of the thread on the thread spool produce.

From US 4,544,113 and US 4,767,071 another method for Winding a bobbin known in which the breathing function for Length change of the traversing stroke a recurring even change between a maximum traverse stroke and a specifies minimal traversing stroke. This can only be a very uneven Generate mass distribution in the end region of the bobbin, which is in relation to middle region has relatively soft end regions.

In the known method, the length change of the traversing stroke the build-up of high bobbin edges at the ends of the thread bobbin avoided. The influence of the distribution of the Reversal points in the end areas of the bobbin on the bobbin density is however purely by chance.

It is an object of the invention to provide a method for winding a bobbin of the type mentioned and a device for performing the Develop method in such a way that the thread spool after winding the Fadens a uniform bobbin density over the entire bobbin width or a has a predetermined profile of the coil density.

It is known that the bobbin density of the thread bobbin is substantially different from that Mass distribution of the thread depends on the bobbin. The within one Traversing stroke per unit of thread deposited on the circumference of the thread spool is however not constant, since the traversing thread guide at the end of the traversing stroke braked out of a traversing speed and after reversing again must be accelerated to the traversing speed. In the area in which the traversing speed is constant, is the one at the circumference of the Thread bobbin deposited thread mass must also be constant. Outside of this linear range, the one deposited on the circumference of the thread spool changes Thread mass continuously up to a maximum in the area of the turning point. The method according to the invention now provides a connection between the Respiratory function and the mass distribution. Here is a Weight distribution of the thread on a theoretically wound ideal thread spool specified. From the theoretically wound ideal thread spool with predetermined mass distribution of the thread is from the distribution of Reversal points in the theoretically wound ideal thread spool Respiratory function determined. With this breathing function, the one to be wrapped Thread spool generated. The particular advantage of the invention is that the End areas of the thread spool with a defined mass distribution of the thread can be wrapped.

To the smallest possible deviations between the given Mass distribution of the thread on the theoretically wound ideal thread spool to the wound mass distribution of the thread on the wound thread spool To get the mass distribution of the thread on the theoretically wound ideal thread spool from given To calculate winding parameters by a microprocessor. As Winding parameters are, for example, the thread speed Traversing speed, the crossing angle, the thread titer and the length of the Reversal range specified. The theoretically wound ideal thread spool is ideally wound by calculation, the calculated mass distribution being one does not exceed the specified setpoint. From the calculated mass distribution of the thread on the theoretically wound ideal thread spool calculated distribution of the reversal points of the traversing thread guide in the Breathing function transferred. This process variant can be used predetermined mass distribution in the wound bobbin without a larger one Realize deviation.

The calculation of the mass distribution of the thread on the theoretically wound ideal thread spool is advantageously carried out in the following steps. First of all, the thread mass deposited during a traverse stroke is calculated from the specified winding parameters. Since the thread mass is proportional to the traversing speed, a certain thread mass can be assigned to each section of the traversing stroke. This assignment is based on the coil width B. For this purpose, the traversing stroke is divided into a plurality of mass segments with a constant width along the coil width. Each mass segment contains the thread mass stored in the mass segment, which is defined as the partial thread mass. Now a setpoint of the mass distribution of the thread on the theoretically wound ideal thread spool to be calculated and a certain number of traversing strokes are specified. The target value of the mass distribution could thus be, for example, that a constant mass distribution (F _target = 100%) is present over the entire coil width.

The number of traversing strokes is arbitrary, with a higher number of one small deviation between the calculated theoretically wound ideal Thread spool and the later wound thread spool leads. Considering the number of traversing strokes and the setpoint of the mass distribution the previously defined mass segments with the respective partial thread masses to the Mass distribution added up. The calculated mass distribution, the same as that predetermined setpoint of the mass distribution, contains a distribution of the Mass segments that serve as a measure of respiratory function. The absolute The number of mass segments is determined by the number of traversing strokes defined because each traverse stroke is made up of a large number of mass segments is.

The breathing function, which forms the distribution of the reversal points during the winding travel, can then be derived from the calculated mass distribution by the following steps. The changes in length of the traversing strokes are determined from the distribution of the mass segments within the calculated mass distribution of the thread on the theoretically wound ideal thread spool. Since each point of reversal or each traverse stroke begins with a mass segment S ₁ may be solely by the distribution of the mass segments S ₁ relative to the package width, the length variations of the traverse strokes derived. In order to convert the length changes of the traversing strokes into the breathing function, a storage algorithm is advantageously included, so that, for example, a certain change between the changes of the individual traversing strokes is maintained.

Since the mass distribution in the area of the traversing stroke, in which the Traversing thread guide is guided with a constant traversing speed, in is substantially constant, it is further proposed that the thread count of a the mass segments by the ratio of the absolute thread mass of the Mass segment to the absolute thread mass one in the middle of the To form coil width lying mass segment. So that exists Possibility of calculating the mass distribution only for the end areas of the Perform coil.

To change the mass distribution of the wound bobbin, it is Method variant according to claim 6 particularly advantageous. Here, the Mass distribution of the thread determined on the wound thread spool. The The actual value of the mass distribution could be by means of a hardness tester or manually determined by a thumb test. By comparison between the given mass distribution with the wound Mass distribution can be determined whether the wound bobbin has the desired density profile. In the event that in certain areas If there are deviations along the coil width, a corrected one is corrected Mass distribution set and the calculation of the theoretically wound ideal bobbin. The calculation is then the Breathing function redefined so that the newly wound bobbin is targeted has changed mass distribution. This process variant is special beneficial to certain profiles of the bobbin density in the wound bobbin to create. This method variant is particularly at the beginning of a process advantageously applicable. Here, a sample coil could be wound first order to quickly optimize the coil density from the actual-target comparison to get. For example, the pattern coil could only have a minimum number of Have thread layers, so that an optimization after a relatively short Winding time is possible.

In a particularly advantageous method variant, the determination of the Breathing function and thus the distribution of the reversal points as well as the Control of the traversing thread guide carried out by a control device. The Control device is connected to a drive of the traversing thread guide, wherein the drive the traversing movement and the traversing stroke of the Traversing thread guide influenced. Since both the traversing speed and also the length of the traversing stroke by the drive of the traversing thread guide are determined, the respiratory function can be carried out with high precision. The drive of the traversing thread guide is directly dependent controlled by the respiratory function in such a way that the respective changes in length the traversing strokes are carried out.

The method according to the invention is independent of the type of winding. As The types of winding apply to wild winding, precision winding or Step precision winding. The mean value of the game winding remains The traversing speed is essentially constant during the winding cycle. Here the winding ratio changes (Spindle speed / traversing speed) steadily during the winding cycle. at A precision winding keeps the winding ratio constant. At a Step precision winding, however, becomes the winding ratio after one predefined program changed in stages.

It is also particularly advantageous to use the method according to the invention with the to combine known methods for mirror disorder. So that can Cross-wound bobbins with a large diameter and high bobbin density at high take-off speeds of over 1,000 m / min and more ensure a trouble-free run of the thread overhead.

The method according to the invention can be used both in the case of cylindrical thread spools essentially rectangular end faces as well as to form biconical bobbins with sloping faces.

The device according to the invention for performing the method draws are characterized by a high flexibility in the manufacture of the thread spools. in this connection the breathing functions can be adjusted individually depending on the predicted mass distributions vary slightly. The control device goes with the specification of the traversing stroke and the traversing speed each from a currently specified respiratory function. This points the control device has a data memory for taking out Winding parameters and a microprocessor to calculate a Mass distribution of the thread on a theoretically wound ideal Thread spool and to determine a breathing function to change the length of the Traverse strokes on.

The flexibility of the device is due to the particularly advantageous Further development of the invention according to claim 12 is increased. Here, the Traversing thread guide by means of an electric motor, for example one Stepper motor or an electric torque sensor, driven. In order to there is the possibility of changing the traversing speed with the respective Coupling the change in length of the traversing stroke. A shortening of the The traversing stroke can thus take place at a constant traversing speed or at thread masses stored per unit of time.

The coupling between the traversing thread guide and the electric motor is advantageously designed as a belt drive. For this purpose, the electric motor has a Drive pulley on which a guided over at least one pulley Belt drives. The traversing thread guide is attached to the belt and is moved back and forth within the coil width.

The inventive method and the device for performing the The inventive method are based on an embodiment in following described with reference to the accompanying drawings.

Fig. 1

schematisch eine Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens;

Fig. 2

schematisch eine Ansicht einer zylindrischen Fadenspule;

Fig. 3

schematisch eine Abwicklung einer Fadenspule mit Längenänderungen der Changierhübe entsprechend einer Atmungsfunktion;

Fig. 4

eine Diagrammdarstellung der Verteilung der Fadenmasse innerhalb eines Changierhubs;

Fig. 5

eine Diagrammdarstellung der Verteilung der Fadenmasse einer Fadenspule;

Fig. 6

schematisch einen Signalplan zur Ermittlung einer Atmungsfunktion Z.

They represent:

Fig. 1

schematically an apparatus for performing the method according to the invention;

Fig. 2

schematically a view of a cylindrical thread spool;

Fig. 3

schematically a development of a thread spool with changes in length of the traversing strokes in accordance with a breathing function;

Fig. 4

a diagram of the distribution of the thread mass within a traverse stroke;

Fig. 5

a diagram of the distribution of the thread mass of a thread spool;

Fig. 6

schematically a signal plan for determining a respiratory function Z.

1 shows an embodiment of a device according to the invention for Implementation of the method according to the invention, as shown for example can be used in a texturing machine. At the free ends of one fork-shaped coil holder 21 are two opposite centering plates 8 and 9 rotatably mounted. The coil holder 21 is on a pivot axis (not here shown) pivotally mounted in a machine frame. Between Centering plates 8 and 9 is a sleeve 7 for receiving a thread bobbin 6 curious; excited. On the surface of the sleeve 7 or the bobbin 6 is one Driving roller 5 on. The drive roller 5 is fixed on a drive shaft 11. The Drive shaft 11 is coupled to roller motor 10 at one end. The Roller motor 10 drives the drive roller 5 with a substantially constant Speed. The sleeve 7 or the bobbin 6 is now over friction driven by the drive roller 5 at a winding speed that a Winding a thread 1 at a substantially constant thread speed allows. The winding speed remains constant during the winding cycle. A traversing device 2 is arranged in front of the drive roller 5. The Traversing device 2 is constructed as a so-called belt traverse. in this connection a traversing thread guide 3 is attached to an endless belt 16. The Belt 16 is parallel to the sleeve between two pulleys 15.1 and 15.2 7 led. In the belt plane there is a part wrapped around the belt Drive pulley 14 arranged parallel to the pulleys 15.1 and 15.2. The drive pulley 14 is on a drive shaft 13 of an electric motor 12 attached. The electric motor 12 drives the drive pulley 14 in an oscillating manner, so that the traversing thread guide 3 in the area between the pulleys 15.1 and 15.2 back and forth. The electric motor 12 is a Control device 4 controllable. The control device 4 is connected to a arranged on the coil holder 21 sensor 17, which the speed of the Sleeve 7 detects and gives as a signal from the control device 4.

In this exemplary embodiment, the sensor 17 is designed as a pulse generator, who senses a catch groove 19 in the centering plate 8. The catch groove 19 belongs to a catching device 18 which catches and catches the thread 1 at the beginning of the winding travel Angling the thread on the sleeve 7 allows. The pulse generator 17 gives one signal per revolution depending on the always recurring catch groove 19. These pulses are in the control device 4th converted to evaluate the speed of the sleeve 7.

In the situation shown in FIG. 1, the thread 1 becomes the thread spool 6 the sleeve 7 wound. The thread is in a guide groove of the Traversing thread guide 3 out. The traversing thread guide 3 is within the Spool width of the bobbin 6 back and forth by the traversing device 2. Here are the movement and the traversing stroke lengths of the traversing thread guide 3 by the electric motor 12, which can be designed, for example, as a stepper motor could be controlled. The increasing bobbin diameter of the bobbin 6 becomes made possible by a pivoting movement of the coil holder 21. The coil holder For this purpose, 21 has force transmitters (not shown here) which, on the one hand, have a Drive the thread spool required contact pressure between the thread spool 6 and generate the drive roller 5 and on the other hand a pivoting movement of the Allow coil holder 21.

The traversing speed of the traversing thread guide 3 and the length of the traversing stroke are predetermined by the controller 4, which leads to a corresponding activation of the electric motor 12. To control the control device 4, the winding parameter E is given. The winding speed, the diameter of the drive roller, the traversing speed, the course of the traversing speed within a traversing stroke and the thread titer of the thread to be wound can be specified as the winding parameters E. The winding parameters E are stored in a data memory 24 within the control device 4. To determine a breathing function Z, the control device 4 has a microprocessor 25. Within the microprocessor 25, a calculation of a mass distribution F of the thread on a theoretically wound ideal thread spool is calculated from a predetermined mass distribution F _{Soll of} the thread on a theoretically wound ideal thread spool and from a predetermined number n of traversing strokes H. A breathing function Z is then derived from the calculation of the mass distribution F, which causes the length changes of the traversing stroke when the electric motor 12 is actuated.

In order for the traversing thread guide 3 to be positioned as precisely as possible by the To achieve traversing drive 2, the electric motor 12 with the control device 4 connected via a signal line through which the control device 4 an angular position of the rotor shaft of the electric motor 12 is supplied in each case. This actual position of the electric motor is in the control of a target position of the Electric motor included, so that always an adjustment and a very precise Control of the electric motor is guaranteed.

In order to obtain a predetermined mass distribution of the deposited thread masses, in particular in the end regions of the thread spool, the length of the traversing stroke is varied according to a predetermined breathing function Z. In Fig. 2 a view of a cylindrical thread spool is shown schematically. The thread spool 6 is wound on the sleeve 7. The thread bobbin has a bobbin width B. The bobbin width B is formed by a maximum traversing stroke H _max . The traversing stroke H denotes the distance in which the traversing thread guide is guided back and forth. During traversing, the thread is guided in the traversing thread guide within the traversing stroke before it runs onto the bobbin surface. For this purpose, the traversing thread guide is driven at a predetermined traversing speed. At the ends of the thread spool 6, the traversing thread guide is braked shortly before reversal and accelerated again in the opposite direction. This thread reversal is shown schematically on the surface of the thread spool 6 using the example of some thread layers in FIG. 2. The point on the bobbin surface that marks the change in direction of the thread deposit due to the reversal of the traversing thread guide is referred to as the thread reversal point U. Depending on the movement sequence of the traversing thread guide, the thread reversal U at the end of the bobbin can extend over a longer distance on the bobbin surface. In this case the thread reversal point is to be equated with the turning point of the thread deposit. However, it is also possible to notionally define a thread reversal point by extending the thread pieces deposited at the end of the bobbin.

In Fig. 2, a thread reversal point U ₁ is entered as an example on the end face 22 of the bobbin 6. A thread reversal point U ' ₁ generated with the same traverse stroke H _max is entered on the opposite end face 23. The thread reversal points U ₁ and U ' ₁ are formed on the outer edge of the thread spool, the traversing thread guide passing through the traversing stroke H _max .

During the winding cycle, so-called breathing is carried out by shortening or lengthening the traversing stroke. Here, the traversing stroke H _max is first reduced to a minimal traversing stroke according to a predetermined breathing function and then extended to the original value H _{max of} the traversing stroke. In FIG. 2, an arbitrary traversing stroke H is shown as an example, which is shortened by the change in length A at both coil ends compared to the maximum traversing stroke H _max . The thread is deposited in the thread reversal at the reversal points U on the left side of the thread spool 6 and in U 'on the right side of the thread spool 6.

In Fig. 3, a breathing function Z is shown schematically as an example for a cycle L in a diagram. In this diagram, the traverse stroke H is entered on the ordinate and the coil circumference π * D on the abscissa. The abscissa simultaneously represents one of the end faces of the thread spool 6. At the beginning of the breathing cycle L, the thread is deposited in the thread reversal at point U ₁ in a traversing stroke with the traversing stroke length H _max . The change in the traversing stroke in the subsequent traversing strokes now takes place according to a breathing function Z. The breathing function Z thus defines the position of the thread reversal points U of the individual traversing strokes H. The course of the breathing function Z shown in FIG. 3 is exemplary. A large number of changes in length A of the traversing strokes are carried out within one breathing cycle L. The cycle L is ended as soon as the original maximum traversing stroke H _max is reached again. A large number of breathing cycles are carried out during the winding of the thread spool.

With each traverse stroke, a piece of thread is deposited on the circumference of the thread spool 6 on the thread spool 6. 4 shows the thread mass 11 deposited during a traverse stroke H in a diagram. For this purpose, the thread mass M is entered on the ordinate and the bobbin width B on the abscissa. The reversal point U is shown as a straight line on the abscissa as an example. The straight line forms the end of a traversing stroke H. This results in an essentially hyperbolic curve f of the thread mass M over the bobbin width B. The curve f thus represents the thread mass deposited along the bobbin within a traversing stroke. The diagram shows that at the end of the traversing stroke H, the deposited thread mass M changes. A constant thread mass is deposited in the area in which the traversing speed is constant. By braking or accelerating the traversing thread guide, the deposited thread mass M increases continuously up to a maximum value in the area of the thread reversal U. In order to calculate a mass distribution F of the thread on a theoretically wound ideal thread spool, the traversing stroke H is divided into a large number of mass segments S divided along the coil width B. The mass segments S are given a constant width δB. a thread mass M deposited within the mass segment S is assigned to each mass segment S thus formed. So the mass segment S ₁ receives the thread mass M ₁ , the mass segment S ₂ the thread mass M ₂ etc. up to a mass segment S _i with the thread mass M _i . The mass segment S _i lies in a range in which the traversing speed is constant. The assigned thread mass M _{i will} thus no longer change until the opposite end face of the bobbin is reached. The distribution of the mass distribution on the opposite end face is analogous to that shown in FIG. 4.

The mass distribution F is advantageously calculated using standardized and therefore dimensionless thread masses. For this purpose, the partial thread mass m of a mass segment is formed by the ratio between the absolute thread mass M of said mass segment and the absolute thread mass M _{i of} a mass segment S _i lying in the central region of the bobbin width, in which a constant traversing speed is present. The thread count in the linear area of the bobbin width is thus m = constant = 1. In reverse areas, the partial thread mass of the mass segments will assume the values m> 1.

The further procedure for determining the respiratory function Z is shown schematically in FIG. 6 using a signal plan. After the mass segments S ₁ to S _{i have been} formed, the mass distribution F of the thread is now calculated on a theoretically wound ideal thread spool. For this purpose, a nominal value of the mass distribution F _{Soll of} the thread is first specified on the theoretically wound ideal thread spool. A maximum number n of the traversing strokes on which the ideal winding of the thread wound is based is predefined. To calculate the mass distribution of the theoretically wound ideal bobbin, the mass segments S ₁ , S ₂ to S _i are added to a multiple corresponding to the number n of traversing strokes. The mass segments are distributed in compliance with the respective traversing strokes in such a way that the calculated total mass distribution on the spool does not exceed the predetermined target value F _target . The calculated distribution of the mass segments includes the traversing stroke changes, so that the calculated mass distribution F is a measure of the sum of the changes in length A of the traversing strokes. The changes in length of the traverse strokes determined from the mass distribution are then determined in the breathing function Z required for the coil travel. A filing algorithm is taken into account, which contains a basic distribution of the length changes, for example to avoid thread overlaps.

Since each of the traversing strokes used in the calculation of the mass distribution F begins with the mass segment S ₁ , the length changes A of the traversing strokes can be determined, for example, in such a way that the coil width B is divided into a large number of small coil sections with a constant width. Starting from one end of the thread bobbin, the number of mass segments S ₁ contained therein is determined in each bobbin section. This results in a distribution of the mass segments S ₁ between the maximum traverse stroke H _max and a minimum traverse stroke H _min . The number of mass segments S ₁ is equal to the number of changes in length A of the traverse strokes. The respiration function Z can thus be determined directly from the distribution of the mass segments S ₁ , taking into account a storage algorithm.

After the breathing function Z is determined, the winding cycle to Winding the bobbin.

After the bobbin has been wound, a check of the bobbin density or the mass distribution is carried out. The wound mass distribution F _actual can, for example, be determined manually by measuring means. The determined mass distribution F _is the wound thread spool can then be given to the microprocessor. A comparison is made within the microprocessor between the wound mass distribution F _actual and the target value of the mass distribution F _target .

The mass distribution of the thread mass M on the thread spool is shown in a diagram in FIG. 5. For this purpose, the thread mass M is plotted on the ordinate and the bobbin width B on the abscissa. The ordinate while an end of the coil. As a target value for the mass distribution of the _target value F is determined, which should be in accordance with the diagram of the entire winding width of 100%. The mass distribution F _actual determined in the wound bobbin is also entered, with a deviation of maximum 10% between the target value F _target and the actual value F _actual being found at the ends of the bobbins. In order to obtain the desired target value F _target in the wound bobbin, a correction value of the mass distribution F _Kor can now be generated. The deviation between the target value F _target and the actual value F _{actual is added to} the relevant coil sections of the target curve. This results in the corrected specification of the mass distribution F _Kor . On the basis of this corrected mass distribution, the breathing function Z is recalculated in accordance with the previous description of FIG. 6. The newly calculated breathing function Z is then used as the basis for the further coil travel to change the length of the traversing strokes.

The method according to the invention thus represents a possibility of targeting the Mass distribution of the thread mass on the thread spool to influence.

LIST OF REFERENCE NUMBERS

1

thread

2

Traversing device

3

Traversing thread guide

4

control device

5

drive roll

6

bobbin

7

shell

8th

centering plate

9

centering plate

10

roller motor

11

drive shaft

12

electric motor

13

drive shaft

14

sheave

15

pulley

16

belt

17

Sensor, pulse generator

18

catcher

19

catching groove

20

thread reserve

21

spool holder

22

front

23

front

24

data storage

25

microprocessor

Claims (13)

1. Method for winding a yarn package, wherein an advancing yarn is reciprocated by means of a traversing yarn guide within a traverse stroke (H) and deposited on the yarn package, wherein the traverse stroke (H) of the traversing yarn guide is variable in its length during the winding operation (winding cycle) within the width of the yarn package (package width) (B), the length variations (A) of the traverse stroke (H) occurring during the winding cycle in accordance with a predetermined-stroke modification function (Z), characterised in that the stroke modification function (Z) is determined from a mass distribution (F) of the yarn on a hypothetically wound, ideal yarn package.
2. Method according to claim 1, characterised in that the mass distribution (F) of the yarn on the hypothetically wound, ideal yarn package is computed by a microprocessor from predetermined winding parameters (E) and while maintaining a predetermined desired value (F_desired) of the mass distribution, and converted to the stroke modification function (Z).
3. Method according to claim 2, characterised in that the computation of the mass distribution (F) of the yarn occurs on the hypothetically wound, ideal yarn package as follows by the steps of:

   3.1 computing the yarn mass (M) deposited during a traverse stroke (H) from predetermined winding parameters (E) ;

   3.2 subdividing the traverse stroke (H) along the package width (B) into a plurality of mass segments (S) with constant widths (δB), and a partial yarn mass (m);

   3.3 predetermining a desired value (F_desired) of the mass distribution of the yarn on the hypothetically wound, ideal yarn package, and predetermining a number of traverse strokes (H_n) ; and

   3.4 adding up the mass segments (S) with partial yarn masses (m) to the mass distribution (F) such that the desired value (F_desired) of the mass distribution is reached, while maintaining the predetermined number of traverse strokes (H_n).
4. Method according to claim 3, characterised in that the stroke modification function (Z) is determined as follows by the steps of:

   4.1 determining the length variations (A) of the traverse strokes from the distribution of the mass segments (S) within the computed mass distribution (F) of the yarn on the hypothetically wound, ideal yarn package and

   4.2 converting the length variations (A) of the traverse strokes to the stroke modification function (Z), while taking into account an algorithm of deposit.
5. Method according to claim 3 or 4, characterised in that the partial yarn mass (m) of one of the mass segments (S) is formed by the ratio of the absolute yarn mass (M) of the mass segment (S) to the absolute yarn mass (M_i) of a mass segment (S_i) extending in the centre range of the package width.
6. Method according to any of claims 1 to 5, characterised in that the mass distribution (F_actual) of the yarn on the wound yarn package is determined and compared with the predetermined mass distribution (F_desired) of the yarn on the hypothetically wound, ideal yarn package, that in the case of a deviation of the mass distribution (F_actual) of the yarn on the wound yarn package from the mass distribution (F_desired) of the yarn on the hypothetically wound, ideal yarn package, a corrected mass distribution (F_corr) of the yarn on the hypothetically wound, ideal yarn package is determined, and that the stroke modification function (Z) is determined from the corrected mass distribution (F_corr) of the yarn on the hypothetically wound, ideal yarn package.
7. Method according to any of the preceding claims characterised in that the traversing yarn guide is driven for oscillating movement by a controllable drive, which is controlled by a controller, the controller comprising the microprocessor for determining the stroke modification function (Z).
8. Method according to claim 7, characterised in that the controller controls the drive of the traversing yarn guide as a function of the stroke modification function (Z) for carrying out the length variations (A) of the traverse strokes.
9. Method according to any of the preceding claims, characterised in that during the winding cycle, the traversing speed is variable in accordance with a predetermined control program.
10. Method according to any of claims 1 to 9, characterised in that during the winding cycle, the traverse stroke is variable for producing a biconical package.
11. Apparatus for carrying out the method according to any of claims 1 to 10, with a driven tube (7), on which the yarn (1) is wound within a package width (B) to a yarn package (6), with a movable traversing yarn guide (3), which is operated by a drive (12) for reciprocal movement within a length-variable traverse stroke (H), and with a controller (4) for controlling the drive (12), characterised in that the controller (4) comprises a data store (24) for receiving winding parameters (E) and a microprocessor (25) for computing a mass distribution (F) of the yarn on a hypothetically wound, ideal yarn package and for determining a stroke modification function (Z) for varying the lengths of the traverse strokes.
12. Apparatus according to claim 11, characterised in that the drive of the traversing yarn guide (3) is an electric motor (12), which controls the traversing motion and the traverse stroke of the traversing yarn guide (3), and which is controllable by the controller (4).
13. Apparatus according to claim 12, characterised in that the electric motor comprises a drive pulley (14), which drives a belt (16) extending over at least one belt pulley (15), to which belt (16) the traversing yarn guide (3) is fastened.

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