WO2001028907A2

WO2001028907A2 - Method and device for winding a thread onto a bobbin

Info

Publication number: WO2001028907A2
Application number: PCT/CH2000/000552
Authority: WO
Inventors: Werner Klee; Heike Syndikus
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 1999-10-19
Filing date: 2000-10-13
Publication date: 2001-04-26
Also published as: JP2004500295A; WO2001028907A3; ATE314301T1; EP1222133B1; EP1222133A2; AU7637600A; DE50011986D1

Abstract

The invention relates to a method for operating a machine, especially a winder, that winds threads. A thread is alternately guided to-and-fro between two change-over points within a traversing stroke and crosswise in relation to the drawing-off direction of the thread by means of a thread guide of a traversing device for being laid onto a rotating bobbin. The invention also relates to devices for carrying out the methods. According to the invention, an end point of the change-over of the thread guide is fixed at a change-over point. The traversing stroke is corrected, preferably shortened or prolonged, during a following stroke and according to the position of the end point. In an alternative embodiment, the actuation of the thread guide or the traversing device is controlled according to a predetermined winding ratio and a bobbin speed in such a way that the winding ratio is maintained when the bobbin speed is changed or not.

Description

Method and device for winding a thread on a spool

The invention relates to a method for winding a thread on a bobbin.

State of the art: (drive technology)

EP 453 622 B1 proposes a device with a thread guide and a thread guide carrier, the carrier being guided in a groove. The device comprises a drive motor and a programmable controller. While the thread guide is near a reversal point, the motor is operated with a higher current than the final current. The current required for operation is below the nominal current when the thread guide is in the remaining area. The basic programs are stored in the control for different winding sections. The control system calculates the paths, speeds and accelerations for the motor movement based on the winding laws that are used. Parameters that can be saved include the basic stroke and the basic stroke variation for producing soft coil edges.

According to the embodiment shown as an example, a stepper motor works as a drive motor between the center of the stroke and a reversal point against a torsion spring. In the vicinity of a reversal point, the spring constant is increased, the current supply to the stepper motor is increased and the frequency of its control pulses is reduced. The motor should therefore come to a standstill at the reversal point. Appropriate monitoring is not planned. A sensor is provided in the middle of the stroke, which enables the detection of errors at this point in the traversing stroke. A traverse stroke is always controlled from this point using a pulse sequence. A precise determination of the reversal points is not apparent from the scripture.

In the method known from EP 453 622 B1, the position of the thread guide is linked and depends on the position of the rotor of an electric motor. The thread guide is moved in the reversal area with very high acceleration and deceleration. The electric motor movement is in this case controlled by a control unit Dependency controlled by the usual winding laws. However, problems arise when the thread is deposited on the bobbin edges

The method known from EP 453 622 B1 is subject to physical and technical restrictions. From a physical point of view, the stepper motor is a spring-mass system that tends to vibrate when the position changes rapidly and executes uncontrollable movements. The reference or zero position is passed twice during a movement of the thread guide The positioning accuracy outside of the zero position is not defined. At higher speeds of 1000 m / min production speed, for example, this method can therefore no longer work with the required accuracy

EP 248 406 A2 describes a traversing device which has means for calculating the stroke in accordance with the number of rotations of the coil and the winding ratio in accordance with the package diameter. However, this invention also does not show any solution to the problems at the coil edges

Furthermore, WO 98/42606 discloses a method for controlling a traversing device driven by a stepping motor, and a traversing device. The position of a traversing thread guide which is moved back and forth within a traversing stroke is determined by the position of a rotor of the stepping motor, the rotor being located within a stand of the stepping motor Moved with multiple windings The aim of the process is to guide the traversing thread guide in the reversing area with optimal utilization of the stepper motor.At the same time, the traversing thread guide in the reversing stroke area should be driven with as little vibration as possible.This is achieved in that the movement of the rotor is controlled by a stator flow which is controlled by a by means of a flow control device generated standing voltage is determined. The field sizes generated directly in the stepper motor are thus used to control the traversing device. Overall, this is intended to be a highly dynamic control of the drive Overall, the application deals primarily with the control of the stepper motor and not with the assembly of a package on a spool Furthermore, WO 99/05055 discloses a method and a device by means of which a thread should be able to be positioned precisely within a traversing stroke. Furthermore, optimal use of the electric motor (stepping motor) should be ensured for each traversing stroke. There is a constant comparison between the actual position and the target position of the thread guide. If there is a discrepancy between the actual position and the target position, a difference signal is generated to control the stepper motor. The target position is determined exclusively by the electric motor. If there is a discrepancy between the actual position and the target position, the amplitude of the current of the electric motor is given by the frequency signal. If a deviation is detected, the stepper motor immediately and directly reacts according to this method, so that the deviation error of the traversing thread guide is corrected immediately.

The prior art also includes the document DE 198 07 030 A1, which discloses a method and a device for winding a continuously running thread into a bobbin formed on a sleeve. The traversing thread guide is accelerated to a guiding speed at one end of the stroke within a reversing distance by a finite acceleration and braked from the guiding speed by a finite deceleration at the opposite end of the stroke within a further reversing distance, and vice versa. Overall, the traversing stroke defined by the reversal points is obtained by adding the three sections: reversing section (acceleration), linear section and reversing section (deceleration). The acceleration and deceleration of the thread guide is controlled in such a way that the lengths of the reversal paths and thus the thread deposit at the ends of the bobbin change within the reversal paths. As a result, the thread reversal is to be initiated sooner or later beginning at the end of the traversing stroke, as a result of which the thread is deposited at different angles to the end face of the bobbin. There should be an even distribution of the thread behind the turning point. The sequences of movements of the thread guide on the reversal paths are predetermined by a predetermined time program sequence.

This known method also enables the acceleration and deceleration of the thread guide to be controlled as a function of the crossing angle, the bobbin diameter and the traversing stroke within the reversal paths Overall, there is a large variety of possibilities from the combination and variation of the reversing distances and the traversing stroke.Therefore, the method can also be used to keep the length of the reversing distances in the reversing areas constant, regardless of the traversing speed Selection of a breath stroke can be changed

DE-A-198 20 464 shows a motor construction that has been specifically designed for use in a rotary actuator

In general, based on this literature, it can be said that when traversing a thread, it is very important that the traversing thread guide at the ends of the traversing stroke is decelerated from a guiding speed in a very short time and accelerated again to a guiding speed. In the ideal case, the reversal of stroke takes place exactly at a specified target stroke reversal position instead This assumption is approximately correct only with very low double stroke rates (<approx. 100 double strokes / min) In practice, however, an overshoot or undershoot of the traversing thread guide can be seen in the stroke reversal

In general, it can therefore be stated that today's control systems are not yet able to meet the high demands placed on the required dynamics.This means that the thread is not exactly deposited at the desired stroke reversal point, but with a certain deviation

State of the art (winding technology)

In addition to the problems with the reversal of the stroke shown, there are further difficulties in the distribution of the thread on a bobbin with a desired or preferred shape, that is to say with a given bobbin or package structure The wild winding has an essentially fixed relationship between the bobbin surface speed and the speed of the thread traversing, if any So-called "wobbling" (to avoid mirror images) is hereby the cross-hair angle is kept constant, while the turn ratio, ie the number of bobbin rotations per double stroke, becomes smaller as the diameter of the bobbin increases. The resulting yarn package has a very uniform density, but it does has poor drainage properties and also shows irregularities in the colors

The precision winding is created by a constant ratio between the bobbin speed and the speed of the thread maneuvering.This keeps the turns ratio the same during the entire winding process.However, the thread crossing angle decreases with increasing bobbin diameter.The bobbin has good run-off properties and generally has a significantly longer run length with the same bobbin volume decreasing crossing angle an increase in the winding density towards the outside, which can lead to an uneven penetration of the dyes in the dyeing

The step precision winding is a precision winding in steps. After each step, the crosshair angle is returned to the original number of degrees, whereby an approximately constant crossing angle is achieved and the winding ratio is reduced in stages. The almost constant crossing angle improves the stability of the package and a Uniform density guaranteed The defined thread section of the precision winding prevents image zones and enables a high winding density. The resulting bobbin has good running properties and a significantly increased running length compared to the wild winding

The winding technology principles of forming a so-called step precision winding are now well known. They are only described here by referring to the relevant patent literature

DE-B-2649780 explains the basic principles of step precision winding by means of computer-controlled drives, but for a winder with a friction roller drive. The explanation of similar principles can also be found in EP-A- 1 18173, which mainly deals with the use of a frequency-controlled motor by means of a frequency converter for the oscillation

The question of the selection of the suitable turn ratios has been dealt with in EP-A-55849 and in US-B-4,676,441 (or EP-A-150771)

The US-B-4,515,320 (or DE-A-3332382) shows the required relationships between the crossing angle of the package (coil) and the turn ratio as a function of the coil diameter. The drive technology then proposed with a servo-controlled belt drive connection between the coil mandrel and the oscillation is, however not suitable for effective control at higher winding speeds

The concept of a "bandwidth" for the crossing angle is available in US 4,515,320, but is then in US-B-4,667,889 (or EP-A-194524), US-B-4, 697,753 (or EP-A-195325), US 5,056,724 (or EP-A-375043) and US-B-5,605,295 (or EP-B-629174) have been further developed. According to this concept, the turn ratio should "jump" from one value to another value when the crossing angle to the lower limit of predetermined bandwidth is reached The input (determination) of an intersection angle profile by means of “support points” has been explained in particular in US Pat

The more recent developments in this area have been shaped by improvements in the drive (control) technology. The improved technology allows more precise control of the winding conditions - see, for example, EP-A-562296 (taking into account the change in the take-up speed caused by a "jump" Thread by adjusting the winding speed)

The “electrical connection” between the coil mandrel and the traverse has been explained both in US-B-4,394,986 (or EP-A-64579) and in US-B-5,439,184 (or EP-A-561188). In both cases it is but provided to first carry out a comparison between the mandrel speed and the speed of a traversing drive and only then, depending on the comparison result, the control of the To accomplish traversing drive The associated time delays prevent compliance with the required, very critical winding conditions

The step precision winding has been provided for a long time for the production of cylindrical coils. Drives for winding units have recently appeared which better support a change in the stroke width during the winding travel. Examples of these drives have already been mentioned in the previous chapter on the prior art

EP 629 174 B1 in particular discloses a method which is conventional today and a corresponding device for winding a thread with a step precision winding. During a winding trip, jumps from a higher turn ratio to a lower turn ratio take place if the crossing angle for the given turn ratio reaches a lower limit The jump height is limited by an upper limit, so that unacceptable sudden changes in the winding conditions are avoided

A thread traversing with which a step precision winding can be implemented is known from WO 99/65810, in particular in combination with a control according to WO 00/24663. The software-oriented control of the thread traverser (pointer) consists of a "fixedly specified" part, which cannot (or should not) be influenced by the user and a part requested by the user, which preferably consists of certain winding parameters. For example, crossing angles, bandwidth, breakage table, stroke breathing and stroke course can be entered as winding parameters. These writings suggest that various "traversing recipes" are established should be programmed that should not be influenced by a user when entering the winding parameters

What is striking in connection with this extensive state of the art is that the new drive technology (despite its wider range of uses and greater flexibility) has not yet led to a review of the previous application of the winding technology fundamentals of step precision winding. It is also noticeable that so far no control principles for the application the new drive technology at delivery speeds above approx. 2000 m / min Furthermore, it appears from this literature that reversing aids or even end stops are required in order to be able to maintain the coil edges

The invention

Starting from the prior art mentioned, it is an object of the invention to better utilize the possibility of the new drive technology for the winding technology. This may make it possible to improve the structure of a package form in such a way that the wound thread at the ends of the traversing stroke reversal is better The thread can also be laid closer to the optimum by means of a precision winding or step precision winding taking into account a package form of the bobbin which can be specified or predetermined by a user

In the following four aspects, the invention provides a winding unit that comprises at least one winding mandrel and a traverse, the traversing being provided with a drive that can be controlled in such a way that the stroke width is variable over the winding travel. The invention is particularly suitable for use in connection with a Swivel drive designed, the movements of a reciprocating yarn guide are determined by the movements of a motor rotor and the motor is provided with a control that allows the rotor to rotate between reversal points that have an angle of rotation distance of less than 360 ° (preferably less than 180 ° ) exhibit

Especially when controlling the formation of a step precision winding, the specifiable stroke width should now be taken into account

In a first aspect, the traversing drive is controlled as a function of the coil speed and a predeterminable winding ratio, the effective winding ratio being selected by the control from a large number of possible winding ratios, both as a function of parameters which influence the crossing angle and as a function of the effective stroke width In a second aspect, the stroke width to be observed by the traversing is specified, the stroke width to be specified being defined with respect to a reference (preferably with respect to the center of the stroke), which has a predetermined, preferably fixed, orientation in the environment defined by the winding unit, in particular with respect to the winding mandrel having.

In a preferred embodiment, target reversal points are defined as a function of the specified stroke width. The target reversal points can preferably be changed or corrected in order to promote compliance with the specified stroke width.

In a third aspect, the average speed of the thread guide over one stroke is derived from the spool speed on the basis of the effective turn ratio and the effective stroke width.

In a fourth aspect, the movement of the thread guide is controlled over a stroke in accordance with a predetermined movement characteristic (profile), whereby an average speed of the thread guide predetermined by the control is maintained. The movement characteristic preferably defines acceleration values and / or speed values which are given at predetermined points the stroke must be observed. Preferably, the integral of the average speed of the thread guide specified by the control is maintained. The optimal movement characteristic can be determined empirically and can (preferably is) be changeable over the winding cycle (i.e. between the beginning and the end of the formation of a specific coil).

In addition to the four aspects mentioned, the invention comprises a method for operating a machine that winds a thread, in particular a winder, wherein the thread is guided alternately between two reversal points within a traversing stroke by means of a thread guide of a traversing device, in order to move on a rotating one Coil to be misplaced. Such a solution to the task is aimed at determining the reversal points or turning points of a thread guide in the course of the winding travel, or that they are observed exactly. According to the invention, the method for operating the thread winding machine, in particular winding machine, that an end point of the reversal of the thread guide is determined at a reversal point and the effective traversing stroke (the effectively determined stroke width) is corrected, preferably shortened or lengthened, in a subsequent stroke, depending on the position of the end point, the target is -Changing stroke, which was determined depending on the specified stroke width, remains constant (unchanged)

In the manufacture of bobbins, the following points are of particular importance: stroke accuracy, high acceleration of the thread guide, mechanical design (e.g. the thread guide) and the resolution of the drive (servo motor or stepper motor) .These focal points are complexly interwoven and mutually influence each other. These complex interactions cause great difficulties

Basically, it can be said that the two main criteria of acceleration and accuracy of the reversal are decisive for the applicability of a drive.The higher the acceleration that can be achieved by a yarn feeder, the better the density distribution in the package can be checked. The exactness of compliance with the reversal points is determined moreover, immediately the quarrel of the face of the pack and thus its withdrawal and transport properties

It has been shown that when changing the double stroke per minute, the reversal point at one end of the traversing stroke as a function of the double stroke or speed is subject to a variable error. In general, servo drives are used for driving a traversing thread driver, which essentially have two controllers (load observers with status / Position controller and current controller) The position of the motor rotor, and thus the thread guide, can be determined by means of a suitable measuring device. Such devices are commercially available. Known encoders or absolute value transmitters are suitable

The inaccuracy of the reversal can be counteracted by equipping and expanding the control loop with a kind of "memory function". If there is a passage at a reversal point within a traversing stroke, the position actual Reversal point detected when the thread guide changes direction.This position value is saved and influences the control of the drive in such a way that the traversing stroke, i.e. the effective stroke of the thread guide (shortening or lengthening), is changed depending on the position of this position value Sequence of the winding trip exactly defined edges of the coil, since the errors are averaged or eliminated by the correction according to the invention

The (effective) traversing stroke is advantageously corrected as a function of the difference between the end point and the reversal point. In this context, the two reversing points of a traversing stroke are regarded as target values and the effective end points as actual values. The resulting difference is a target-actual deviation, which controls the effective traverse stroke accordingly, so that the desired and precise coil edges are created

The target reversal points are therefore changed depending on the effective reversal points (actual values), if necessary, in order to be able to maintain a target stroke width

Compared to the previous controls of the stepper motor, which focus on the deviations of the stepper motor from a target value and its immediate follow-up when a deviation is found, the present invention aims to make the end points of the effective traversing stroke repeatable at predetermined locations viewed as a whole, the position of the thread guide when depositing a thread on a spool is important - as a further difference

In one embodiment, the difference between the actual end point and the target reversal point is averaged over several strokes.This averaging can be carried out continuously, for example, using a moving averaging, which means that a correction only has to be made if, for example, a significant deviation or drift in the mean value is found

Furthermore, the method provides that the traversing stroke is corrected in any stroke value of the winding travel. This method is variable because the correction is only carried out if certain conditions are met for controlling the drive. The control then, for example, automatically and automatically determines when the traversing stroke is shortened or extended. Alternatively, a user can specify that the traversing stroke is corrected, for example, after a definable number of double strokes becomes

Likewise, after a determined deviation of the actual end point from the target reversal point, the traversing stroke can be corrected in the stroke immediately following

By forming the target-actual difference of the stroke reversal position (subtraction of the end point from the reversal point), an (effective) run-on error can be calculated. By adjusting the setpoints for the reversal points, the run-up error can be eliminated in the sense that the effective stroke width matches the target Stroke width is adjusted This is possible because the reversal points are not "fixed", but can be determined by the control depending on the desired stroke width

According to a development of the invention, the tracking error can be taken into account in the control as a function of the traversing speed and / or acceleration. The trailing error can be stored, preferably in a so-called table as a function of the traversing speed and / or the acceleration.These tables can be used for a to calculate the following trajectory

If, due to the regularities of the step precision winding, there is a turn ratio jump and thus a double stroke number jump, an expected follow-up error from the table is interpolated and subtracted from or added to the stroke width, so that the stroke shortening or stroke extension caused by the double stroke jump is compensated Drive significantly improved

In order to achieve different package forms of a bobbin, the stroke width is advantageously varied in the course of the bobbin travel, but the stroke width can also can be varied, for example, by means of a predefinable stroke breathing, which has a positive effect on the thread distribution in the stroke reversal and thus on the spool hardness distribution

With regard to the general principle of the invention, it can be said that the method is characterized in that the course of the desired stroke reversal points can be specified for a winding travel and the specified course is influenced, that is to say corrected, as a function of the detected deviations (at the reversal points) The course of the desired stroke reversal points is preferably determined by entering a stroke width course

To carry out this method, a thread-winding machine is proposed, in particular a winder, with a traversing device, the thread being guided alternately between two reversal points within a traversing stroke by means of a thread guide of a traversing device, in order to be laid on a rotating spool , and the traversing device has an oscillating drive. This machine is characterized in that the machine has a detection device for detecting an end point when the thread guide reverses the stroke and a control device for correcting the effective traversing stroke, preferably shortening or lengthening, depending on the position of the end point The arrangement enables compliance with a predetermined (target) stroke width

The aim of the invention can also be to enable, in particular, a precision winding or step precision winding, taking into account a preferred or predeterminable packaging form of a bobbin. Depending on a predetermined winding ratio and the rotational speed of the bobbin, the drive of the thread guide or the traversing device can be controlled in such a way that the existing coil speed or a change in the coil speed the turn ratio is maintained almost exactly The turn ratio results from the quotient of the coil speed and the number of double strokes (as a divisor) By observing the turn ratio at a specific and current speed of the coil is the time for one stroke fixed and defined on the basis the drive or servo drive of the thread guide can be precisely controlled and driven in these sizes.

In order to achieve a special package form of a bobbin with thread, the stroke width and / or the turns ratio are varied during the bobbin travel. If these sizes change, this has the direct consequence that the drive also receives completely new control commands or values. This also applies to a change in the coil speed, which is directly related to the turn ratio.

To achieve a desired bobbin shape when laying the thread on the bobbin, the effective stroke width can be varied during the bobbin travel. One possibility is to continuously change the stroke width during the winding cycle. With this modulation, a defined packing geometry e.g. conical coils are generated. Another variant is stroke breathing, in which the effective stroke width is changed periodically in order to neglect the accumulation of thread deposit, which can occur due to the acceleration and deceleration in the stroke reversal. This only has an influence on the uniformity of the thread distribution over the stroke and on the shape of saddles (hard bobbin edges). Of course, both variants can be combined with each other. The parameters for the stroke routing and / or stroke breathing can be entered by an operator, for example. The thread laying on the bobbin is preferably carried out as a function of the bobbin diameter and / or the time (sequence) and / or the number of strokes and / or the stroke width. Alternatively, fixed or variable recipes are stored in a computer or memory. The stroke breathing can be parameterized, among other things. in at least three sizes: stroke period, stroke amplitude and stroke distribution.

The stroke period describes the length of the cycle of one stroke breathing (e.g. 100 to 4000 traverse strokes). The increase or decrease in the nominal stroke can be determined using the stroke amplitude (e.g. in oo of the nominal stroke). The ratio of the stroke amplitude to the stroke amplitude is expressed by means of the stroke distribution (unit:% of the period). These parameters can be length-independent as well as speed-independent. In a further embodiment, it is also possible to repeat not only a combination of these three parameters, but also with retrieve at least one other combination alternately. The stroke routing is preferably defined by reference points or reference points which relate to the diameter, and interpolation is carried out in between. Instead of the diameter, the time or a speed can be used as an adjustment parameter.

In addition, it is advantageous if a speed profile of the thread guide or the traversing device is specified between the reversal points of the stroke. The speed profile serves as a setpoint for controlling the drive. Due to the course of the profile, for example through support points or points, a predeterminable coil shape is wound up. The course of the profile affects in particular the thread placement and thus the bobbin hardness distribution. Since these properties are also influenced by other operating parameters, several profiles of the speed can be stored in a control computer of the drive and made available for retrieval.

In a development of the invention, the speed profile is formed independently of the stroke widths during a winding cycle and / or is based on an average laying speed. Since bobbins of different lengths can be produced on the thread-winding machine, the speed profile, which is independent of the stroke width, makes it possible, so that many bobbins of different lengths can be used on the machine. The reference to an average laying speed also makes the speed profile independent, since no absolute speeds e.g. be driven by the thread guide. The relative speed or the relative speed profile generally gives the same or similar coil shapes on different long coils.

Due to the independence from absolute speed values as setpoint specifications for the drive, the average laying speed is defined or ascertained by the stroke width and the stroke time or number of double strokes which can be determined by the turns ratio and the spool speed. Alternatively, it can be said that the average laying speed is given by the time integral of the speed over a stroke. The speed curve must therefore be over an entire stroke contains exactly the average speed. Based on these values, specifications and accelerations for the drive can be determined or calculated

For a (step) prazιsιonswιcklung it is necessary that a predetermined turns ratio is maintained at a certain spool speed, whereby the stroke time can be determined with the aid of the stroke width. As a result of the diameter increase of the package by winding, the speed of the spool changes continuously that from the specification for the crossing angle, the bandwidth and the breakage table, the turn ratio for the (step) praxis-definition is defined. The “breakage table contains the broken parts of the turn ratio (see also EP-A-55849 and US-B-4, 676,441 )

To form a (step) prazιsιonswιcklung it is advantageous that a given turn ratio with a very high resolution (order of magnitude about 10 ppM) to comply. To achieve this, the laying speed (and thus the number of double strokes per unit of time) should be very accurate be tracked in a certain transmission ratio of the coil speed

If the coil speed is recorded with a conventional speed measurement for this purpose, it is difficult to achieve the required accuracy.The reasons for this are either too little resolution of the measurement result or too little time of the measurement interval.To avoid this difficulty, the approach can be taken that A certain stroke distance is immediately assigned to a certain number of spool revolutions or fractions of spool revolutions. According to the invention, a certain stroke distance is assigned to a pulse of a desired stroke counter for a certain turn ratio and a predetermined spool speed

In a further development according to the invention, the desired stroke counter is increased by a certain value in the case of a pulse. For example, a tachometer on a coil delivers a certain number of pulses per coil revolution. Each pulse of the tachometer allows a very specific stroke path for a selected turn ratio assign. This target stroke counter is consequently increased for each speedometer pulse by a value determined by the current turn ratio.

In order to monitor compliance with the turns ratio, the value of the desired stroke counter is fed to a controller with a value of an actual stroke counter of the drive. In order to ensure that the turns ratio is monitored, the drive or servo drive of the traversing device also has an identical or identical counter. This actual stroke counter counts the number of strokes carried out with the same resolution. The actual stroke counter and target stroke counter serve as a control and control variable for a controller. The desired laying speed is determined as the manipulated variable of this controller, or a correction of this speed is determined.

In order to achieve compliance with the specific winding ratio at a given spool speed, the drive of the traversing device or of the thread guide is controlled by means of the average laying speed and the stroke length (in one stroke). As a result, the thread guide is accelerated or decelerated, so that the bobbin is provided with a (step) precision winding.

Furthermore, in an advantageous development, the method provides that the modulation of the stroke width is used to implement end bead formation within the stroke and / or to form a thread reserve, in particular outside the stroke, with the speed of the thread guide being braked to zero can.

A thread-winding machine for carrying out the method shown is characterized by an input of operating data, a coil tachometer, a nominal stroke counter, an actual stroke counter on the drive of the traversing device and a computing and control unit for determining an acceleration value while maintaining a predetermined winding ratio at a certain predetermined coil speed.

Furthermore, the invention allows other types of winding to be used in addition to the (step) precision winding. To avoid image windings, for example, the middle one Laying speed changed continuously as a function of time (wobble with wild winding) or changed as a function of the coil diameter in discrete steps (ribbon free). A combination of the two methods is also possible.

In the wild winding, the accuracy requirements for the average laying speed are much lower than in the (step) precision winding. In this case, a control loop can be dispensed with. With the other method (ribbon free) it is important to know the current winding ratio or the coil diameter very precisely and to react with sufficient accuracy with the average laying speed.

In a further embodiment of the invention, the possibility of varying the stroke width is also used to position the thread within the stroke (e.g. to form an end bead) or outside the stroke (e.g. to form a thread reserve). This basic mechanism is already known from patent specification EP 31 1 827. The main difference is that the thread is caught by the thread guide when it is drawn in, moves to the positioning position, is caught by the sleeve, forms a defined thread reserve and is then moved into the lifting area. The thread guide then acts as a traversing thread guide itself. When changing the bobbin, i.e. when the desired bobbin diameter, the desired length or running time has been wound, the traversing thread guide is stopped at a defined position within the stroke in order to form the end bead. The thread guide is then returned to the positioning position so that the thread can be caught on a new empty tube. The thread never leaves the thread guide. Positioning times can thus be reduced to a minimum or set to a defined, reproducible value. This system is particularly suitable for bobbins with a mandrel displacement in which the position of the end bead corresponds to that of the positioning position before catching, since the thread wrap can then be reduced to a minimum.

Exemplary embodiments of the invention are explained in more detail with reference to the following drawings. Show it: FIG. 1 shows a schematic calculation of deviations in the reversal of the thread guide at the reversal point,

FIG. 2 shows an alternative to FIG. 1,

Figure 3 is a schematic representation for calculating an average

4, a schematic representation for calculating the acceleration of a servo drive,

FIG. 5 shows an example for the parameterization of a lifting breathing,

FIG. 6 shows a representation for a speed profile,

FIG. 7 shows an example of a combined parameterization of the lifting breathing,

Figure 8 shows another example of a combined parameterization of the

stroke breathing,

Figure 9 shows an example of a parameterization of the continuous

Hubveranderung,

FIG. 10 shows a copy of FIG. 1 from WO 99/65810,

FIG. 11 shows a copy of FIG. 2 from WO 99/65810,

FIG. 12 shows a copy of FIG. 3 from WO 99/65810,

FIG. 13 shows a copy of FIG. 4 from WO 99/65810,

FIG. 14 shows a copy of FIG. 5 from WO 99/65810,

Figure 15 is a schematic representation of the "winder environment" for the

Traversing, and Figure 16 is a schematic representation of a control system according to the

Invention.

For the time being, general explanations are given in connection with FIGS. 10ff. Subsequently, the explanations according to FIGS. 1 to 9 will be discussed.

10 schematically shows a cross section through a winding machine 1, in which a thread F is built into a bobbin 3 by means of a traversing device 2. The coil 3 is built up on a sleeve 4, which is received by a coil mandrel 14.

The bobbin 3 is driven either by a drive of the bobbin mandrel 14 (not shown) or by means of a friction roller or contact roller 5. The friction or contact roller (when the bobbin mandrel is driven) also has the function of threading an oscillating thread guide 7 here Called pointer 7 to take over. The pointer 7 is arranged between or in front of a guide ruler 6 and the friction roller or tachometer roller 5. Additions to the description of the pointer are contained in our patent application CH 1 1 19/99 dated June 16, 1999.

The coil 3 with the sleeve 4 is shown in the working position, with an empty sleeve 4.1 located at the beginning of a coil construction in the working position on the friction or. Speedometer roller 5 is shown attached, while 4.2 empty sleeves are shown in the waiting position. These two waiting positions are the starting positions for a rotary movement of a so-called turret drive, shown by the dash-dotted line, by means of which the empty sleeves on the distribution roller or the full spool 3.1 are moved away from the distribution roller into a removal position.

The pointer 7 is fastened in a rotationally fixed manner on the motor shaft 9 of a motor 8 with the larger and heavier end, the motor 8 being controlled by a controller 12 in accordance with a lifting program for the construction of a coil. Such a program is entered into the control via an input device 13. To control the movement of the pointer 7, a movement monitoring device 16 is provided, consisting of a signal transmitter 10 which is fixedly connected to the motor shaft 9 and a signal receiver 11 which is arranged separately therefrom and which outputs its received signals to the controller 12. The pointer drive can be designed as a servo drive that includes an encoder that generates at least one pulse row during operation. The encoder can, for example, be provided with two pulse tracks, each track being formed to generate 1024 pulses per revolution.

11 shows the winding machine 1 in viewing direction I, the input device 13 and the controller 12 not being shown for the sake of simplicity. 11 is to show firstly that the pointer 7 can not only be moved back and forth within the stroke H, but that the thread F can be stopped on the one hand for changing the bobbin by means of the pointer 7 in the position C in order to to form a so-called end bead of the finished coil.

Furthermore, the pointer 7 for a thread feed at the start of a winding process or when changing the bobbin in the positions A and B outside the stroke H can be stopped (or moved at a reduced speed), namely in position A, around the thread in one position to keep in which this can be caught by a catch knife or sleeve notch of a next following sleeve, on the other hand in position B where the thread can form in a reserve winding on the sleeve end. The thread F is then guided by the pointer 7 into the stroke H and further shifted back and forth within the stroke.

It can be seen from this that the pointer of this variant can not only be decelerated or accelerated at the ends of the stroke without external aids, but that the pointer can be brought very quickly into positions in which it stands still for a short moment and then again to be moved or accelerated at a definite speed into another functional area. FIG. 12 additionally shows a speed curve of the pointer 7. The speed curve shown differs depending on the type of coil construction, which is why the speed curve shown does not constitute a restriction for the possible speed curve of the pointer 7. FIG. 13 shows a variant of the guide neales 6, on the one hand by the guide guide 6 3 compared to the guide 6 of FIGS. 2 and 3 has an elongated guide track 17 1 and on the other hand the thread F is guided in an extended guide slot 15 1 of the thread guide 7. There is certainly the possibility, depending on the bobbin structure and traversing speed curve and arrangement of the friction roller or tachometer roller 5 to provide other guideline shapes relative to pointer 7 and relative to guideline 6

The meaning of the traversing for the coil structure in general will now be explained on the basis of the schematic illustration in FIG. 14, without going into any problems in connection with the practical implementation. Such problems and solutions according to this invention are explained below with reference to other figures

14 shows diagrammatically the axis of rotation D of the pointer 7 and the reversal points U1, U2 of a specific traversing movement of the thread guide 15 with stroke length B. The longitudinal axis ZL of the pointer 7 must be pivoted about the axis D by an angle γ in order to produce the traversing movement The design of the coil should make it possible to select a variable angle of rotation as a reversal point according to the control system.This movement can be programmed into the control system 12, the reversal points being defined, for example, with respect to a reference line R. The sensor 10 (FIG. 10) or the evaluation in The controller 12 can in principle be designed such that the motor 8 reverses its rotation by the controller by means of a comparison with a predetermined reversal point (U1 or U2). The actual position of the pointer 7 is always known via the motion monitoring device 16 and can be obtained from the controller 12 can be compared with the predetermined reversal points to make the reversal each the desired position

These reversal points U1.U2 determine the positions of the corresponding edges of the coil. For the sake of simplicity, a cylindrical coil can initially be assumed The positions of the coil edges in the axial direction relative to the sleeve are important in two ways

- First, they must correspond to a given stroke width (axial length) of the coil, and

- Secondly, the positions that have been determined must be maintained or follow a predetermined change pattern (ie they must not "wander" uncontrollably)

The reversal points U1, U2 can be changed (within predetermined limits) via the input device 13, as will be explained in more detail below. This is indicated schematically by the dashed lines in FIG. 14. At most, the rotation speed of the arm has to be changed, e.g. if the linear speed of the thread guide has to remain constant. For example, you can also enter a coil build cycle, which can be used to change the stroke during the coil build. The set-up cycle also includes, for example, the definition of a thread-catching position associated with it, as already described. For example, the operator 12 is prompted by the controller 12 to enter the required parameters before a winding cycle can be started

FIG. 15 schematically shows a part of a coil mandrel 50 with an axis of rotation (longitudinal axis) DA and a sleeve 51, which is held at a predetermined location in the longitudinal direction of the dome by suitable means (not shown). A coil (not shown) is to be built up on the sleeve within a predetermined maximum stroke width HB1. This stroke width is defined in relation to a “reference data” RD, which in this example is located in the middle of the stroke (although this is not essential) FIG. 14 is preferably changed to coincide with the reference data RD (FIG. 15) of the winder environment - but the two references must in any case have a predetermined relationship to one another, which must then be taken into account when programming the control of the traversing

If it is a cylindrical coil, the coil edges are ideally at the limits of the predetermined stroke width HB1. Still will preferably not always wound up to these outer limits, since the risk of material accumulation in the edge areas of the coil is high. It is therefore known, when forming a cylindrical coil, to change the stroke width periodically during the winding travel (stroke breathing) - indicated schematically in FIG. 15 with the “stroke width HB2”, although the actual stroke breathing can require a more complex mechanical process Now according to the invention by means of movements of the pointer, controlled by a predetermined control program, however, the use of an arrangement according to Figures 10 to 14 also enables the programming of the winder around coils (packs) with a different (non-cylindrical) structure (for example conical or biconical coils) This also requires a control program that provides a variable stroke width.

Selection and compliance with a turn ratio.

The turns ratio can be conventionally represented by the following formula

Number of spool revolutions n (SP) (1) VW =

Number of double strokes of the thread guide n (DH).

or, in other words, the number of spool revolutions per double stroke.

Relationships between the coil speed and the corresponding speed of a drive motor for traversing have traditionally been derived from this formula (see, for example, US Pat. No. 4,676,441). These relationships serve to determine a suitable control program for the oscillation drive. The traditionally derived relationships are sufficient for this purpose in connection with a system in which the movement characteristics of the thread guide over the stroke are given by the geometry of mechanical guide elements (for example a grooved roller or the wing in a wing traversing). The traditionally derived relationships are no longer sufficient for the purpose where the thread guide is no longer steered "mechanically" but with a much higher degree of flexibility "electrically"

The number of double strokes n (DH) can, however, be represented by the following formula

V (CH) (2) n (DH) =

2 x HB

where, V (CH) the average speed of the thread guide over a single stroke, and

HB is the corresponding stroke width

Further

V (SP)

(3) n (SP) π .D (SP) where, V (SP) is the peripheral speed of the coil, and D (SP) is the current coil diameter

This gives the following relationship

2 x HB V (SP) (4) VW = π D (SP) V (CH) and

2 x HB x n (SP) (5) VW =

V (CH) Two conclusions can be drawn from this:

(i) In order to maintain a specified bandwidth of the crossing angle, which depends on the ratio between V (SP) and V (CH), it is not only the selection of a suitable winding ratio that is decisive for each coil diameter to be traversed - the set stroke width must also be taken into account. In other words, when programming a variable stroke width, the selection of the turns ratio must be made both as a function of the coil diameter and as a function of the stroke width in order to be able to maintain the bandwidth of the crossing angle entered by the end user.

(ii) For an effectively selected winding ratio WV and an effectively set stroke width HB, the suitable average thread guide speed V (CH) can be derived from the bobbin speed.

From these relationships, important control parameters can be derived which must be observed in order to produce the desired package structure. Taking these findings into account brings considerable advantages in and of itself. However, it does not allow an optimal or complete use of the new possibilities of the further developed drive technology. In order to be able to achieve such a result, the movements of the thread guide must be controlled within one stroke, as has been indicated variously in the prior art, but without specifying how the system as a whole should be controlled.

Design of a control system

In order to provide an overview of the different parts of the system, three "functions" of the system are described here. These functions can be nested into one another in software, although it is advantageous to separate them and to keep them apart during programming. The three functions are : 1. The first winding technology function: This function includes the calculation routine which was explained with reference to FIGS. 10 to 15 and the formulas 1 to 5. The “products” of this function are, on the one hand, the selection of a suitable turn ratio in order to be able to maintain the bandwidth for the crossing angle ß, and on the other hand the determination of a suitable one average thread feeder speed in order to be able to maintain the selected winding ratio. These products can be programmed in part on the basis of theoretical considerations, for example

(6) V (CH) = V (SP tan (ß / 2)

2HB

(7) WV = π. D (SP) x tan (ß / 2)

2 The second winding technology function

This function defines the movement characteristics of the thread guide and the thread within and at the end of the stroke. A suitable characteristic cannot be determined on the basis of theoretical considerations, but must be determined empirically using suitable methods. Nevertheless, it is possible to determine certain "corner points" within the stroke Define "profiles", which are then filled out on the basis of the empirical results as a function of the data for the individual case. Examples of such a procedure within the stroke are explained below with reference to FIGS. 5 to 9. It is important, however, that the first function determined criteria are observed - they serve as critical parameters for the design of the movement characteristics. This applies in particular (but not exclusively) to the maintenance of the average thread feeder speed. It is therefore advantageous to use the desired movement characteristics as a (mathematical) function d to define the average thread feeder speed 3 Motor control function

This function requires the translation of the results of the first and second functions into control signals which cause the corresponding movements of the rotor from the oscillation motor

With regard to modern drive technology, it is sufficient to define a movement characteristic of the thread guide by means of acceleration or speed values at predetermined positions within a stroke. The specialists in drive technology are thus able to determine the corresponding control signals for the selected motor type. For example, it is possible In this context, the considerations from EP-B-435622 and / or EP-A-901979 and / or WO 98/42606 should be taken into account. This third function is not dealt with in more detail below because it represents a special task of its own, which is more related to the Drive technology than is connected to the winding technology

The three functions can be represented schematically in accordance with FIG. 16.Box F1 indicates a computing routine which emits a control signal which corresponds to the required average yarn feeder speed.Box F2 indicates an arithmetic routine which uses the average yarn feeder speed and a predetermined profile to indicate the movement characteristics of the Define the thread guide (or the motor rotor)

Box F3 pointed to the arithmetic routine hm, which convert the defined movement characteristics into suitable control signals for the selected drive motor AM, in order to allow pointer Z to oscillate in the best possible way over the set stroke width (or through the corresponding stroke rotation angle)

However, it will be clear to the person skilled in the art that in practice it will be very difficult to control the actual movements of the pointer Z according to the desired “model”. In order to ensure that the critical parameters are observed, it is advisable to provide monitoring, which is preferably able to adjust certain control parameters by means of at least one feedback in order to to force the desired results if possible, if they do not result from the control signals already explained

A first feedback of this type is indicated in FIG. 16 with the sensor system S for the position of the pointer Z (or its drive AM), a comparator VG1 and a setpoint adjuster SW1 for the pointer position, whereby a system correction can be derived from the comparison Feedback is indicated with a comparator VG2 and a setpoint adjuster SW2

According to the invention, the monitoring is carried out as part of the first function. The correction can take the form of a correction of the determined average thread feeder speed (by means of VG1) and or the setpoints for the stroke width (by means of VG2). The devices which enable such monitoring are carried out below 1 to 4 are described, whereby the aforementioned problems of maintaining specified reversal points for the thread guide must be dealt with. Given the high double-stroke numbers required in a high-speed winder, it cannot be expected that the thread guide will easily reach the theoretical reversal point (e.g. U1 or U2, Fig. 14) first comes to a standstill and then moves in the opposite direction. The reversal of the thread guide movement is always associated with a certain error. It is therefore important to take this fact into account in order to keep its importance for the bobbin construction within acceptable limits ten, such limits being defined by the user of the machine (depending on their own quality requirements)

Suitable designs

FIG. 1 shows a possibility of calculating the deviations of the end points of a thread guide during the reversal at a reversal point. An encoder 110, a drive (not shown here) supplies pulses to an evaluation device, which are evaluated, for example, using a feedback method. The evaluation device 1 12 supplies a target Reversal point, which is supplied as the actual stroke reversal point I to a memory, preferably flash memory 1 13, this actual value I is forwarded to a computer 1 14. In the computer 114, which is designed as a control computer, both the traversing speeds V _C H of the thread guide and the exact stroke reversal point, which is used as the setpoint S, are stored. By subtracting the actual value I from the target value S, the difference and a tracking error of the thread guide and a resultant, called drag error of the thread are determined, which as a combined value depending on the traversing speed V _C H in a tracking table 1 15 in Calculator 1 14 can be saved. In the event of a double-stroke rate jump, an anticipated overrun error of the thread guide, the thread from Table 1 15 can be calculated by means of interpolation, so that corresponding control commands which take into account a new reversal point of the thread guide are passed on to the controls.

FIG. 2 shows an alternative to FIG. 1 and comprises an encoder 111, which delivers its signal to an evaluation device 112, which delivers the actual stroke reversal point. In this case, the control computer 114 supplies the setpoint value of the reversal to the flash memory 13. The determination of the deviation of the actual value I from the setpoint value S takes place outside the computer 114, this being calculated by the computer 114 and is passed on to a setpoint generator 1 16. The deviations as a function of the traversing speed V _ch are stored in the follow-up table 115. The setpoint generator 116 forwards corresponding control commands after receiving the deviation value to a position speed controller 11 of a drive.

In the possibility shown in FIG. 2, the traversing stroke is corrected after each stroke. As a result, the system can correct a follow-up error that occurs much faster than with the solution from FIG. 1.

The target-actual deviations are generally calculated for the left and right sides of the traversing, so that target values for the left and right side of the coil are also simultaneously present in the computer 14 or memory 13.

FIG. 3 shows the method of calculating an average laying speed or average angular velocity ω _{m of} a pointer as a thread guide, which is necessary for compliance of a specific winding ratio at a specific spool speed is determined By means of an input 130, customer-specific operating data BD can be entered, for example crossing angle, bandwidth, stroke width etc. Furthermore, the configuration data KD, which are important for controlling the traversing, are preferably predetermined, which are used for the calculation of actuating data the traversing SD are used. In addition, a break table BT, which contains, among other things, favorable turns, is provided

A winding ratio table WV is generated from the operating data BD, the breakage table BT and the configuration data KD together with a coil diameter SPD that is currently being calculated the jump itself is limited by the permissible crossing changes

To determine the current coil diameter, the control data of the traversing SD are taken into account on the one hand. On the other hand, the frequency of a sensing roller f ™ and the frequency of the coil fsp are used for this purpose. The current coil diameter D (SP) is determined from the data mentioned

At the same time, the frequency pulse f _S p is passed on to a target stroke counter H _S OLL. To calculate the target position during the stroke, the turn ratio table WV supplies a value for the coil diameter to the stroke counter HSOL

The drive of the traversing device in turn has a stroke counter that records the actual position of the thread guide. Comparing the desired position with the actual position of the thread guide results in a control and guide size in a controller 131. The set size of this controller 131 is the average laying speed or uni-speed speed _m To maintain the turn ratio WV at a given coil speed, it is advantageous to monitor the turn ratio WV with a high resolution. For this purpose, a tachometer delivers a certain number of pulses f _sp per coil revolution. In this way, each pulse of the speedometer can be assigned a precisely ascertainable stroke distance for a predetermined turn ratio.

FIG. 4 shows a schematic illustration for calculating the acceleration values for a servo drive of a traversing device. For this purpose, further operating data BD, e.g. are important for lifting breathing, preferably selected manually by a user. The important values for stroke breathing include the stroke period, stroke distribution and stroke amplitude, etc. (see below).

From these operating data BD, control data are determined which are used for calculating the stroke width HB. From the configuration data KD for the control, in particular the pointer length and the profile table PT of a speed profile in one stroke, further actuating data of the traversing are recorded, which are used further for the acceleration values of the drive AS. The turn ratio table WV is determined from these operating data BD, the configuration data KD and the break table BT. This turn ratio table WV also contains the course of the stroke length as a function of the coil diameter. The stroke period counter HP is acted upon by the actual counter H _ist with values or pulses.

The current stroke width setpoint HB is now determined from the stroke period counter HP, the stroke width corresponding to the coil diameter D (SP) from the turn ratio table WV and the course of stroke breathing defined in the operating data BD (as a function of the number of strokes). The acceleration values AS of the servo drive are now determined from the nominal stroke width setpoint HB, the turn ratio table WV, the profile table PT and the mean laying speed or mean angular speed ω _m .

The counter of the stroke period HP receives data from a stroke counter, to which signals or values from the actual stroke counter of the servo motor are applied. From the positioning data of the traversing, the calculated stroke width and the also calculated average Installation speed, an acceleration table AS for the servo drive of the traversing device is calculated

Overall, the calculation of the acceleration table AS results in a very precise laying of the thread on the rotating bobbin while observing the winding ratio and the bobbin speed

FIG. 5 shows an example of the parameterization of a stroke breathing. The stroke breathing leads to a modulation of the stroke width in the course of the winding travel

FIG. 5 shows the temporal increase and decrease of the nominal stroke with a stroke amp A. The stroke amplitude A can be selected in oo of the nominal stroke HB. The stroke distribution V indicates the ratio of the increase to the decrease in amplitude, for example in% of the period. The stroke period P describes the length of time of the modulation cycle and can be specified in units of the traverse stroke. In other alternatives of the modulations, the period P can also relate to the number of double strokes (n _DH ) or to the bobbin diameter or bobbin time

However, as already mentioned, at least two different combinations of the amplitude modulations can alternately be used (FIG. 7). However, it is also possible at times to keep the stroke width constant (FIG. 8). In this case, the amplitude A ₂ and / or the stroke distribution V _{2 is} equal to zero Figure 6 shows the specification of a speed professional in one stroke The speed profile is defined with the support points P ₀ to P ₈ and places the (relative) speed of the thread guide or the traversing device between the end deflections Ei and E ₂ Die End deflections Ei and E ₂ represent a relative stroke width, which is adjusted according to the actual stroke width on a spool. The support points P ₀ to P _{8 are also shown} as relative speed values with respect to the average deflection speed.A control computer calculates the given speed profile and the actual stroke width the acceleration profile for a servo drive, whereby the turns ratio and the coil speed are maintained almost exactly FIG. 9 shows, for example, the diameter-dependent change in the stroke width HB as a function of the coil diameter, which is defined via the support points Di and the associated stroke widths HB. Four interpolation points D ₀ to D ₃ and HB ₀ to HB ₃ are shown in this example. Of course, the stroke width can be changed depending on the number of double strokes Π _D H or the winding time t.

The stroke width variation and the parameters for the stroke breathing (e.g. Figure 7) can be available in fixed menus or can be specified by an operator. The provision of bobbin recipes makes work easier when winding the thread.

The arrangement is preferably selected such that the user must specify the stroke width (HB) of the coil to be formed (enter it in the control). Based on this specified stroke width, the controller (preferably a computer) can determine a target position (RR) for the end point of the reversal of the thread guide on the right bobbin edge and a target position (LR) for the end point of the reversal of the thread guide on the left bobbin edge and determine it for the winding process. These target positions form both fixed reference points (starting points) for the pack structure, as well as the first target values (target reversal points) for the drive control of the traversing. The end point of the reversal of the thread guide on the left (right) spool edge should therefore coincide with the corresponding target reversal point. However, as has already been explained in the preceding description, it is unlikely that the thread guide can be moved by the controlled drive in such a way that it comes to a standstill at any desired reversal point defined in the control and begins its "return journey". In other words , you have to reckon with the fact that the actual end point of the thread guide movement will always deviate from a target reversal point recorded in the control system, ie there will be an error with respect to this point. However, this error can be determined and measured. The control system can therefore ensure this that the summation of the measured error with the target reversal point recorded in the control system results in the applicable target position for the end point of the reversal Be variable depending on the intended coil structure (lifting breathing, etc.). The respective error compared to the currently applicable target reversal point cannot be influenced directly, but the controller can adapt the target reversal point that it has set itself in order to take into account the effective size of the error. It should be noted, however, that although the target reversal points can be freely determined by the controller, the target positions for the end points of the reversal can only be changed in accordance with the data entered for the winding process.

Claims

claims

1. A method for operating a thread-winding machine, in particular a winding machine, wherein a thread is guided back and forth alternately between two reversal points within a traversing stroke by means of a thread guide of a traversing device in order to be laid on a rotating spool, characterized in that an end point of the reversal of the thread guide is determined at a reversal point and, depending on the position of the end point, the traversing stroke is corrected, preferably shortened or lengthened, for a subsequent stroke.

2. The method according to claim 1, characterized in that the traversing stroke is corrected as a function of the difference between the end point and the reversal point.

3. The method according to any one of the preceding claims, characterized in that the difference of the end point from the reversal point is averaged over several strokes.

4. The method according to any one of the preceding claims, characterized in that the traversing stroke is corrected in any stroke.

5. The method according to any one of the preceding claims, characterized in that the traversing stroke is corrected in the stroke immediately following.

6. The method according to any one of the preceding claims, characterized in that an error is calculated from the difference of the end point from the reversal point.

7. The method according to any one of the preceding claims, characterized in that the error, preferably in a table depending on the traversing speed, is stored.

8. The method according to any one of the preceding claims, characterized in that an expected error is interpolated from the table in a double stroke jump and is subtracted from or added to the stroke width, so that the stroke shortening or stroke extension caused by the double stroke jump is compensated

Method according to one of the preceding claims, characterized in that the stroke width is varied in the course of a winding trip

Thread winding machine, in particular a winding machine, with a traversing device, the thread being alternately guided back and forth between two reversal points within a traversing stroke by means of a traverse device of a traversing device, in order to be laid on a rotating spool, and the traversing device via an oscillating one Drive has, and in particular for performing the method according to one of the preceding claims, characterized by a detection device for detecting an end point when the thread guide reverses the stroke and a control device for correcting, preferably shortening or lengthening, the traverse stroke depending on the position of the end point

Method for operating a thread-winding machine, in particular a winding machine, whereby a thread is guided back and forth alternately between two reversal points within a traversing stroke by means of a thread guide of a traversing device in order to be laid on a rotating spool, characterized in that depending on a predetermined turn ratio and a bobbin speed, the drive of the thread guide or the traversing device is controlled such that the turn ratio is maintained at the bobbin speed or a change in the bobbin speed

A method according to claim 1 1, characterized in that the stroke width and / or the turns ratio are varied

Method according to one of the preceding claims, characterized in that the laying of the thread is modulated or corrected by means of a stroke breathing and / or a, preferably continuous, stroke variation during a winding trip is, preferably depending on the coil diameter and / or the number of strokes and / or the time and / or the stroke width.

14. The method according to any one of the preceding claims, characterized in that a speed profile of the thread guide between the reversal points of the stroke is specified.

15. The method according to any one of the preceding claims, characterized in that the speed profile is formed independently of the stroke widths during a winding trip and / or is based on an average laying speed.

16. The method according to any one of the preceding claims, characterized in that the average laying speed is determined by the stroke width, the turns ratio and the spool speed.

17. The method according to any one of the preceding claims, characterized in that for a predetermined turn ratio and a predetermined coil speed a pulse of a target stroke counter is assigned a certain stroke.

18. The method according to any one of the preceding claims, characterized in that the target stroke counter is increased by a certain value for a pulse.

19. The method according to any one of the preceding claims, characterized in that the value of the target stroke counter with the value of an actual stroke counter of the drive are fed to a controller.

20. The method according to any one of the preceding claims, characterized in that the controller determines the average correction of the laying speed from the value of the target and actual stroke counter.

21. The method according to any one of the preceding claims, characterized in that the modulation of the stroke width for realizing an end bead formation within of the stroke and / or to form a thread reserve, in particular outside the stroke, wherein the speed of the thread guide can be slowed down to zero

Thread-winding machine, in particular a winding machine, with a traversing device, the thread being guided alternately between two reversal points within a traversing stroke hm and fro, by means of a thread guide of a traversing device, in order to be laid on a rotating spool, and the traversing device via an oscillating one Drive has, and in particular to carry out the method according to one of the preceding claims 11 to 21, characterized by an input of operating data, a coil tachometer, a target stroke counter, an actual stroke counter on the drive of the traversing device and a computing and control unit Determination of an acceleration value while maintaining a predetermined winding ratio at a specific predetermined stroke width and the given coil speed

Spooling unit with at least one spool and a traversing, the traversing being provided with a drive which can be controlled in such a way that the stroke width is variable over the winding travel, in particular with a swivel drive, characterized in that the traversing drive is controlled as a function of the spool speed and a predeterminable winding ratio the effective winding ratio is selected by the control from a large number of possible winding ratios, both as a function of parameters which influence the crossing angle and as a function of the effective stroke width

Spooling unit with at least one spool and a traversing, the traversing being provided with a drive which can be controlled in such a way that the stroke width can be varied over the winding travel, in particular with a swivel drive, characterized in that the stroke width to be complied with by the traversing is predetermined, the one to be specified Stroke width is defined with respect to a reference date (preferably with respect to the stroke center), which in the environment defined by the winding unit, in particular with respect to the winding mandrel, has a predetermined, preferably fixed, orientation.

25. winding unit according to claim 24, characterized in that target reversal points are defined as a function of the predetermined stroke width, the target reversal points are preferably changeable to favor compliance with the predetermined stroke width.

26. winding unit with at least one bobbin mandrel and a traversing, the traversing being provided with a drive which is controllable in such a way that the stroke width is variable over the winding travel, in particular with a swivel drive, characterized in that the average speed of the thread guide over a stroke from the Coil speed is derived from the effective turns ratio and the effective stroke width.

27. winding unit with at least one bobbin mandrel and a traversing, the traversing being provided with a drive which can be controlled in such a way that the stroke width is variable over the winding travel, in particular with a swivel drive, characterized in that the movement of the thread guide over a stroke according to a predetermined Movement characteristics (profile) is controlled, whereby a predetermined speed of the thread guide is maintained by the control.

28. Winding unit according to claim 27, characterized in that the movement characteristic defines acceleration values and / or speed values which are to be maintained at predetermined points over the stroke.

29. winding unit according to claim 28, characterized in that the optimal movement characteristic is determined empirically and preferably changes over the winding travel (ie between the beginning and end of the formation of a specific bobbin). Spooling unit according to one of claims 23 to 29, characterized in that the movements of a reciprocating thread guide are determined by the movements of a motor rotor and the motor is provided with a control which allows the rotor to rotate between reversal points which have an angle of rotation distance of less as 360 ° (preferably less than 180 °)

Winding machine with a traversing device, which comprises a thread guide, which can be moved back and forth within a traversing stroke by a controllable motor, characterized in that

- the stroke width must be entered,

at least a first setpoint for the end point of the reversal of the thread guide is derived therefrom,

- An actual value for the end point of the reversal of the thread guide is determined, and depending on a determined difference between the actual value for the end point of the reversal of the thread guide and the first setpoint for the end point of the reversal of the thread guide, a changed setpoint for the end point of the reversal of the Thread guide is derived such that the difference between the actual value and the first setpoint is reduced

Winding machine according to claim 31, characterized in that said first setpoint is the first value of a setpoint value series which corresponds to a course of the stroke width over the winding cycle

A winder according to claim 34, characterized in that the actual value for the end point of the reversal of the thread guide is determined by a detection device attached to the motor shaft