EP3901076A1 - Method for high-precision thread delivery during winding of a bobbin - Google Patents

Abstract

Method for high-precision thread deposition of a thread (1) when winding a bobbin (2), comprising the following steps: a) Permanent detection of a winding angle ϕ _bobbin or a precursor value from which the winding angle ϕ <sub> bobbin </ sub> can be calculated, where the winding angle ϕ _bobbin describes a coordinate (3) of the thread (1) in a circumferential direction (4) on the bobbin (2); b) calculating a traversing thread guide Control angle ϕ _{changier, control} as a function of the winding angle ϕ _bobbin and / or the precursor value where the traversing thread guide control angle ϕ _{changes, control} from the Winding angle ϕ _bobbin and / or the precursor value is calculated taking into account at least one K value; c) using the traversing thread guide control angle ϕ _{changier, control} to calculate an axial thread deposit -Set position Z _should on the bobbin (2); d) controlling a traversing thread guide (5) according to the axial en Thread storage target position Z _should for high-precision thread storage at the coordinate described with the winding angle ϕ _bobbin on the axial thread storage target position Z _should.

Description

The invention relates to the thread deposit when winding bobbins, in particular when winding synthetic threads into so-called cross-wound bobbins, in which the thread wound on the bobbin regularly crosses. In order to wind such bobbins, a traversing thread guide (also called traversing device) is usually used, which moves back and forth in a Z-direction (axial direction of the bobbin) according to a certain scheme in order to deposit the thread on the bobbin steer.

When winding bobbins, it is essential to ensure that a stable, even bobbin is built up. In the case of the cross-wound bobbins mentioned, there is in particular the problem of so-called "mirror formation" in this context. A mirror arises as the bobbin diameter increases when one or more complete bobbin revolutions take place per double stroke of the traversing device, ie when the ratio of the speed of the bobbin to the double stroke frequency of the traversing device is 1, a multiple or a fraction. A complete back and forth movement of the traversing thread guide is referred to as a double stroke. The frequency with which double strokes are performed is referred to as the double stroke frequency or the traversing frequency. The speed of the coil can also be referred to as the frequency of the coil or the rotational frequency of the coil. The ratio of the speed of the spool to the double stroke frequency of the traversing device is generally referred to by the term “crossing ratio” or “crossing value” K. The mirrors, which are often referred to as image windings, lead to certain disturbances when the reel is being unwound. Furthermore, mirrors lead to vibrations in the winding machine during winding and thus to an unsteady contact between the pressure roller and the bobbin and finally also to damage the coil. Mirrors must therefore, especially with smooth threads such. B. chemical fibers are avoided.

With a so-called precision winding, the bobbin is built up at a traversing speed that is directly proportional to the speed of the bobbin. This means that with a precision winding the crossover ratio is fixed and remains constant over the course of the winding cycle, while the double stroke frequency or the traversing frequency decreases proportionally to the winding speed with the package diameter as a proportionality factor. With such a precision winding, specifying the winding ratio with the K value prevents or at least largely reduces mirror formation. A further development of the precision winding is the so-called stepped precision winding or step precision winding (SPW). It differs from precision winding only in that the crossover ratio only remains constant during specified phases of the package manufacture (also known as the winding cycle). From phase to phase, the crossing ratio is reduced in jumps by a sudden increase in the traversing speed. This means that with the step precision winding a precision winding takes place within each phase or step, in which the double stroke frequency or the traversing frequency decreases proportionally with the spindle speed. After each phase, the double stroke frequency is increased again by leaps and bounds, so that a decreasing crossover ratio results. The crossing conditions that are to be maintained during the individual phases are calculated in advance and programmed. Usually there is a predefined table of crossover values, which is also called the K-value table and which can be viewed as a type of specification for the construction of the coil or as a type of construction plan for the construction of the coil.

Such precision windings and step precision windings are, for example, from the documents DE 198 17 111 A1 and DE 198 35 888 A1 known. Even the US 2018/0162681 A1 and that concerns step precision windings with the aim of a particularly dense packing of the thread. the DE 11 2004 000 484 B4 relates to stepped precision windings with a focus on the thread guidance on the side parts of the winding body. the DE 100 21 963 A1 also relates to step precision windings with a focus from the thread deposit at the thread reversal points on the outer edge of the bobbin.

From a mathematical point of view, the basic idea behind precision winding and step precision winding is that the speed of the bobbin n _bobbin , or the frequency of the bobbin rotating movement (f _bobbin ), is in a fixed relationship to the required transverse movement of the yarn guide. The reciprocal of the time until the thread guide completes a complete movement from the left to the right edge of the bobbin and back again is referred to as the traverse frequency or double stroke frequency f _changier . The fixed ratio of the frequency of the coil f _coil to the double stroke frequency or traversing frequency f _traversing is determined as a function of the current coil circumference or the current value of the thickness of the coil D _coil . From this follows the so-called K-factor, which defines the ratio of the coil frequency to the double stroke frequency or traversing frequency as follows: $$K\left({\mathrm{D.}}_{\mathit{Kitchen\; sink}}\right)=\frac{f_{\mathit{Kitchen\; sink}}}{f_{\mathit{Changier}}}$$

die Dicke der Spule D_Spule direkt aus der Drehzahl der Spule n_Spule , f_Spule abgeleitet werden, so dass in diesem Fall der K-Faktor nur durch f_Spule festgelegt wird und sich die Doppelhubfrequenz bzw. Changier-Frequenz f_changier zu $$f_{\mathit{Changier}}=\frac{f_{\mathit{Spule}}}{K\left(f_{\mathit{Spule}}\right)}$$

berechnet. Die K-Werte, welche die Spiegelbildung vermeiden, werden bei der Stufenpräzisionswicklung üblicherweise aus einer weiter oben schon beschriebenen K-Wert-Tabelle ermittelt. Die K-Wert-Tabelle ist bevorzugt als eine Art Look-UP-Tabelle ausgebildet und dazu eingerichtet stufenweise in Abhängigkeit der Dicke der Spule D_Spule bzw. der Drehzahl der Spule n_Spule, f_Spule den jeweils gültigen K-Wert zurück zu geben, so dass durch die eingestellten Verhältnisse von f_Spule zu f_Changier die kritische Spiegelbildung verhindert wird.Changes in the frequency of the bobbin f _bobbin or the speed of the bobbin n _bobbin are usually caused by a constancy of the _thread speed v thread. The thread speed is normally specified in devices for winding bobbins, for example by having an upstream machine for producing, processing or processing the thread for a constant thread speed v _{Thread is} set up. Against this background, it can be seen that with increasing thickness of the bobbin D _bobbin, the speed n _bobbin or the frequency f _bobbin must decrease in order to achieve the desired constant peripheral speed and thus the desired _thread speed v thread even with bobbins with a larger diameter on the bobbin surface reach. Since the K-factor is only determined as a function of the thickness of the bobbin D _bobbin can be assumed to be constant thread speed or circumferential speed $$v_{\mathit{thread}}=\pi \cdot {\mathrm{D.}}_{\mathit{Kitchen\; sink}}\cdot f_{\mathit{Kitchen\; sink}}=\mathit{const}\mathrm{.}$$

the thickness of the coil D _coil are derived directly from the rotational speed of the coil _bobbin n, f _coil, so that set in this case the K-factor f only by _{the coil} and the Doppelhubfrequenz or traversing frequency f _iridescent to $$f_{\mathit{Changier}}=\frac{f_{\mathit{Kitchen\; sink}}}{K\left(f_{\mathit{Kitchen\; sink}}\right)}$$

calculated. The K values, which avoid mirror formation, are usually determined in the step precision winding from a K value table already described above. The K-value table is preferably designed as a kind of look-up table and is set up to give back the respectively valid K-value in steps depending on the thickness of the coil D _coil or the speed of the coil n _coil , f _coil, so that the set ratios of f _bobbin to f _traversing prevent critical mirror formation.

exakt eingehalten werden muss, um dauerhaft die Spiegelbildung zu vermeiden. Die aus der Drehzahl der Spule n_Spulg, f_Spule im System einzustellende Changier-Frequenz f_Changier sollte regelmäßig keinen Fehler aufweisen. Toleranzen für dieses Verhältnis liegen üblicherweise in der Größenordnung von 10^-5 Hz = 0,00001 Hz und kleiner. Um solche Toleranzen einhalten zu können ist ein hoher Aufwand bei der Drehzahlgenauigkeit erforderlich, welcher mit immensem Aufwand bei der Erfassung von f_Spule und der Einstellung von f_Changier verbunden ist.A major technical challenge in the manufacture of precision windings and step precision windings is that the ratio of the two frequencies is set in steps $$K\left(f_{\mathit{Kitchen\; sink}}\right)=\frac{f_{\mathit{Kitchen\; sink}}}{f_{\mathit{Changier}}}$$

must be strictly adhered to in order to avoid permanent mirror formation. _{The traversing} frequency f _{traversing to} be set in the system from the speed of the reel n reel, f _reel should regularly not show any errors. Tolerances for this ratio are usually in the order of magnitude of 10 ^-5 Hz = 0.00001 Hz and less. In order to be able to adhere to such tolerances, a great deal of effort is required for the speed accuracy, which is associated with immense effort in the detection of f _bobbin and the setting of f _traversing .

It is the object of the invention described here to provide a new solution to this problem, which in particular has a significantly increased tolerance to inaccuracy in the metrological detection of variables and in compliance with target parameters in the control (especially in the control of the traversing yarn guide) and at the same time produces the high or even higher quality of the coils.

These objects are achieved with a method according to the features of claim 1, a control device according to the features of claim 8 and a coil according to the features of claim 11. The dependent claims and the description explain particularly preferred embodiments to which the invention is not limited is.

1. a) Permanentes Erfassen eines Wickelwinkels ϕ_Spule oder eines Vorläuferwerts aus welchem der Wickelwinkel ϕ_Spule bestimmt werden kann, wobei der Wickelwinkel ϕ_Spule eine Koordinate des Fadens in einer Umfangsrichtung auf der Spule beschreibt;
2. b) Berechnen einer Changier-Fadenführer-Steuerwinkels ϕ_{Changier,steuer} in Abhängigkeit des Wickelwinkels ϕ_Spule und/oder des Vorläuferwerts, wobei der Changier-Fadenführer-Steuerwinkel ϕ_{Changier,steuer} aus dem Wickelwinkel ϕ_Spule unter Berücksichtigung mindestens eines K-Wertes berechnet wird;
3. c) Verwenden des Changier-Fadenführer-Steuerwinkels ϕ_{Changier,steuer} zum Berechnen einer axiale Fadenablage-Sollposition Z_soll auf der Spule;
4. d) Steuern eines Changier-Fadenführers gemäß der axialen Fadenablage-Sollposition Z_soll zur hochpräzisen Fadenablage an der mit dem Wickelwinkels ϕ_Spule beschriebenen Koordinate auf der axialen Fadenablage-Sollposition Z_soll.

A method for high-precision thread deposition of a thread when winding a bobbin is described here, comprising the following steps:

1. a) Permanent detecting a winding angle φ _coil or a precursor from which the value of the winding angle φ _coil can be determined, wherein the winding angle φ _coil describes a coordinate of the thread in a circumferential direction on the coil;
2. b) calculating a traversing thread guide-control angle φ _{traversing, controlling} a function of the winding angle φ _coil and / or the precursor value, wherein the traversing thread guide control angle φ _{traversing, controlling} φ from the winding angle of _coil under consideration is calculated at least a K value ;
3. c) Use of the traversing thread guide-control angle φ _{traversing, controlling} for calculating an axial thread tray set position _to Z on the spool;
4. d) Controlling a traversing thread guide according to the axial thread storage target position Z _should for high-precision thread storage at the _{coordinate described with the winding angle ϕ bobbin} on the axial thread storage target position Z _should .

The core of the novel process described here is the newly introduced parameter of the winding angle ϕ _coil in step a). This parameter is ultimately an angular value in the circumferential direction of the bobbin that follows the course of the thread wound on the bobbin over the entire structure of the bobbin and with which any desired coordinate of the thread on the bobbin can be described exactly. This parameter ϕ _coil can be specified in different units, for example in angular degrees, where one revolution of the coil corresponds to 360 ° (angular degrees) and, for example, 3 rotations to 1080 ° (angular degrees) or in radians, where one revolution of the coil corresponds to ^{the value 2 ∗ π} and for example 3 revolutions 6 ^∗ π. The parameter ϕ _coil can, however, also be defined in such a way that one turn of the coil corresponds exactly to the increase of the parameter corresponds to the value 1, in which case half a revolution would correspond to the value 0.5, for example.

The coordinate does not correspond to the length of the thread at the storage position because the length of the thread per loop changes depending on the thickness of the bobbin D _bobbin and depending on the K value. Rather, the coordinate describes a position of the thread that can be clearly described _{with the winding angle ϕ bobbin.} The thickness of the bobbin and the K value can be specified for each thread coordinate that can be described _{with the winding angle ϕ bobbin.}

In connection with the parameter of the winding angle ϕ _bobbin , it is crucial that this parameter is not reset during the winding process of the bobbin, but rather runs up continuously during the entire winding process.

The winding angle ϕ _coil can be detected in the most varied of ways, for example with a counter for counting the revolutions or partial revolutions of the coil or with similar devices. For this purpose, design variants are explained in more detail below.

In the context of the method, it is not necessary that the winding angle ϕ _{coil is} actually determined explicitly, but it is also possible that only a precursor value is determined that can be used to calculate the winding angle ϕ _coil . This can then b in the method explained below step) for calculating the traversing thread guide-control angle φ _{traversing be} used _tax. It is important that at least the precursor value corresponds to the basic idea that an absolute coordinate of the thread can be described here and not just a speed of the bobbin and / or of the thread during winding.

In step b), a so-called traversing thread guide control _{angle ϕ chan-gier,} control is calculated on the basis of the winding angle ϕ _bobbin. This new parameter is used to control a traversing yarn guide and this parameter also runs up during the entire winding process of the bobbin with the winding angle ϕ _bobbin . In the calculation of the traversing thread guide control angle φ _{traversing, tax} and the introduction already discussed known K values and, if appropriate, other input variables can be considered. The ways in which this can be done will be explained in more detail below. In particular, by changing K values in producing a step precision winding runs φ _{traversing, controlling} not continuously proportional to the winding angle φ _coil high, but it can herein change the procedure for calculation of the traversing thread guide-control angle φ _{traversing, controlling} φ from the winding angle of _coil under Consideration of the K-value and possibly other input variables occur.

In that the method with the wrapping angle φ _coil and with the traversing thread guide-control angle φ _{traversing, controlling} each does not consider the speed of winding and the traversing operation, but in each case endless parameters are taken into consideration, any coordinate of the wound thread is on the coil writable. Using the winding angle ϕ _bobbin , any coordinate of the wound thread can be described exactly and it is even possible to build a kind of model of the entire bobbin with which every crossing point at which threads of different windings of the bobbin cross would be exactly predictable and describable.

In step c) will be of the traversing thread guide-control angle φ _{traversing used tax,} an axial thread tray target position Z _{is to} be calculated on the coil. The axial thread storage target position Z and also an actual axial thread storage actual _{position Z act, which is still defined below,} do not necessarily have to correspond 1: 1 to the position of the thread on the bobbin. Due to the winding of the The thread-acting mechanics can again lead to differences, which can be due, for example, to the fact that the thread runs after the traversing thread guide or because the thread overshoots a little when the movement of the traversing thread guide changes direction. Such effects are preferably neglected here. It is assumed that the actual axial thread deposit position Z _{ist is set} by the traversing thread guide. Step c) also includes the variant that the axial thread tray position Z _{will take} the form of a traversing thread guide command angle φ _{traversing is to} be calculated, which _{is to} a desired axial thread tray target position Z is defined. A traversing thread guide target angle ϕ traversing _{, soll} is therefore a special case of Z _soll . Traversing thread guide target angle ϕ traversing _{, should be} considered as Z _should , for example, if traversing thread guides are designed as traversing thread guide arms pivotable about a pivot point at an angle or if traversing thread guides are designed as so-called bi-rotors, in which the Traversing movement is carried out by a rotary drive, which is converted by a gear unit into a linear traversing movement in the Z direction.

When calculating the nominal axial thread deposit position Z _soll , two different variants are basically possible. In fact, the length of the bobbin in the axial Z direction is limited and a traversing thread guide for depositing the thread also moves back and forth in this limited area. For this reason, the nominal axial thread deposit position Z _{should be} understood as an absolute position of the thread at the coordinate of the thread in the Z direction described _{with the winding angle ϕ bobbin.} With each reciprocation of the traversing thread guide, the axial thread tray set position Z _will then reset again, and this does not run with the winding angle φ _coil and the traversing thread guide control angle φ _{traversing, tax} high. However, it is also possible to view the movement of the traversing thread guide as an (infinitely) continued movement during the winding process. With this approach, for example the regular reversals of the movement of the traversing thread guide for depositing the thread are mentally hidden and the linear movements of the thread guide are considered to be continued indefinitely. In other words: With this approach, the total path covered by the thread guide is considered or added up or integrated. Such a consideration of the target axial thread deposit position Z _should correspond, for example, when the traversing thread guide is driven by an eccentric which executes a rotational movement and this is converted into an axial traversing movement by an eccentric element of the eccentric to control the traversing thread guide . The axial thread deposit target position Z _should then be used to describe the (infinitely) continued rotational movement of the eccentric drive. Such design variants can in particular be implemented with the bi-rotor already described above, in which (as mentioned above), for example, Z _should be defined as ϕ _{traversing, should.}

A conversion of the (infinitely) continued or increasing parameter ϕ _{traversing, control} in Z _should as a parameter that describes the traversing movement (e.g. ϕ _{traversing, should} ) can be carried out, for example, with a modulo operation in which the input value ϕ _traversing, is divided by a _control parameter value and a residue remains, which _{is to} the output value Z or φ _{traversing should} or denotes an intermediate variable for calculating these values. According to step d), a traversing thread guide is now activated in order _to carry out the thread deposition in accordance with the axial thread deposition target position Z setpoint.

The method is particularly advantageous if the winding angle ϕ _{bobbin describes} the coordinate of the thread in the circumferential direction on the bobbin, starting from a start of winding of the thread on the bobbin and continuing over all windings of the bobbin.

The winding angle φ _coil thus starts preferably with a start value (for example, "0" at the beginning of the winding process and runs this basis always remains high as an example. If the winding angle φ _coil is measured in radians, would the winding angle φ _coil to 100,000 revolutions of the Coil for winding, for example, has a value of 2 ^∗ π ^∗ 100,000.

In addition, advantageous when a storage of the thread at the target position Z _to a traversing thread guide command angle φ _{traversing, to} is defined, which describes a positioning angle of a traversing thread guide having a thread tray at the axial thread tray target position Z _to effected.

As already described above, different design variants of a traversing thread guide are possible. Widely used traversing thread guides are arms that are rotatably suspended in an angular range and that guide the thread, which has already been mentioned above. Another variant can be a slide which can be displaced purely linearly along the Z direction and which, if necessary, can also be driven with a linear drive. Drives for traversing yarn guides with so-called bi-rotors, which have also already been mentioned above, are also possible.

It is also advantageous if, for determining the winding angle ϕ _coil or the precursor value in step a), input variables are used which can also be used to determine the angular speed of the coil when winding Ω _coil . Such input variables are in particular measured values that _{can also be used to determine the angular velocity Ω coil} , such as measured times for defined numbers of revolutions / windings of the coil or measured changes in the winding angle ϕ _coil (e.g. dϕ _coil or Δϕ _coil as possible Precursor values) etc. In the mathematical sense the determination of the winding angle ϕ _{coil can be} understood as the integration of the angular speed of the coil when winding Ω _coil .

As already stated above, it is customary in winding devices for the method described to monitor the speed of the winding process, in particular the angular speed of the bobbin when winding Ω _bobbin , this parameter traditionally being used for the double stroke frequency or traversing frequency or the traversing speed -Adjust the thread guide according to the instructions described above. Here it is proposed to use the angular speed of the bobbin when winding Ω _bobbin or the input variables commonly used to determine the angular speed in order to determine the winding angle ϕ _bobbin or the traversing thread guide control _{angle ϕ changier, control based on this by integration} . This makes it possible to use the usual sensor system in order to carry out the method described (in particular step a) of the method described).

Integration preferably takes place over the time that elapses while winding the coil. In design variants it is also possible that the integration takes place via another parameter, for example via the counting number of windings, which can be determined with a winding counter or with a pulse counter, with which the number of revolutions of the coil and / or the number of produced windings on the coil can be counted.

Was above already stated that instead of the winding angle φ _coil in step a) also a precursor size of the winding angle can be determined, which then subsequently) b in step for the determination of the traversing thread guide control angle φ _traverse, may be used _control. In variants of the method, it is possible that this precursor variable is a variable that is still integrated over time or another continuous parameter (such as the winding counter _{n coil)} must be to get to the winding angle ϕ _coil . Such a precursor variable can be determined, for example, with a pulse counter or with an incremental encoder. Such an incremental encoder is set up to measure an increment of the winding angle (a change in the winding angle) and make it available as a variable. Preferably is then that the traversing thread guide control angle φ _{traversing, controlling} in step b) takes place in the context of an integration of the determination.

It is also advantageous if _{a winding counter is used to determine the winding angle ϕ coil} in step a), which counter indicates the number of windings on the coil.

Such a winding counter can be implemented, for example, by a switch which is activated once for each revolution of the coil. Such a switch can be electronically connected to a counter which continuously counts up with the number of windings. It is particularly preferred if such a winding counter n _bobbin combined with a recorded and integrated angular velocity Ω _{bobbin of} the bobbin is used during winding during winding in order to determine _{the winding angle ϕ bobbin.}

It is also advantageous if the angular velocity Ω _{bobbin of} the bobbin during winding during the winding of the bobbin is _{adapted as a function of the increasing thickness of the bobbin D bobbin in} such a way that a constant thread speed is achieved in upstream processing steps of the thread.

It was already indicated above that a constant thread speed is desirable, in particular because of other boundary conditions during the winding process. Adjustments of the angular speed Ω _bobbin to achieve a constant thread speed despite an increasing thickness of the bobbin D _bobbin , create difficulties in the classic method for controlling the traversing yarn guide, which are better solved in the method described here, because the change from speeds to absolute angular values with the method described here means that inaccuracies or tolerances in the speed detection are less important for accuracy the thread rest.

As already explained, is a K value of at least taken into account in the calculation of the traversing thread guide control angle φ _{traversing, controlling} φ from the winding angle of _coil. The K value is constant at least for a time interval during the winding of the bobbin; this specifies a structure of intersection points of windings of the thread.

Was above already discussed the fact that in the calculation of the traversing thread guide control angle φ _{traversing, tax} in step) parameter b to be considered. In order for a so-called precision winding to occur, it is important that such a parameter (K value) is constant at least for a time interval while the coil is being wound. Such a time interval preferably lasts over the entire period of time during which the coil is wound.

• Wickelwinkel ϕ_Spule;
• Winkelgeschwindigkeit Ω_Spule;
• Drehzahl der Spule n_Spule oder Frequenz der Spule f_Spule; oder
• Dicke der Spule D_Spule.

It is particularly advantageous if a plurality of K values are used when winding the coil, which are determined according to a predetermined scheme as a function of at least one of the following parameters:

• Winding angle ϕ _coil ;
• Angular velocity Ω _coil ;
• Speed of coil n _coil or frequency of coil f _coil ; or
• Thickness of the coil D _coil .

Each K-value leads to a certain step of the coil, in which a certain shape of the windings of the coil is achieved through the K-value. The use of a plurality of K values and the step-by-step change between these K values results in a structure of the coil which is referred to as a step precision winding. The so-called step precision winding has already been explained in more detail above.

Preference is given to K values for the determination of the traversing thread guide control angle φ _{traversing, controlling} in step b) externally process (that is, outside of the process described herein) determined. The method described here is given a K-value table with K-values, preferably as a rule for building a coil. The method described here then ensures that this rule for building a coil during winding is complied with. The selection of the correct K value for the respective stage of the winding can be made using a suitable parameter. It is regularly advantageous if the K value is selected via the (present) diameter of the coil D _coil or the speed of the coil n _coil .

It is also advantageous if the traversing thread guide is controlled by a controller in step c) and an existing thread deposit position Z act _{is monitored and the control difference ΔZ =} Z _{setpoint -} Z act _is calculated as the input variable for the controller.

An existing thread storage position _Z can also be "effective" as a yarn storage position are called. The present thread deposit position Z _ist is preferably detected with a sensor. As already indicated above, by the mechanics of the deposit of the yarn can be present between the thread tray position _is Z, which is used for the method described herein and the thread tray situation actually also deviations occur on the reel, with the traversing thread guide are conditional. Such deviations can occur, for example, because the thread follows the traversing movement and / or overshoots when the direction of the traversing movement changes. The control difference ΔZ describes an error in the thread deposit position. With the method described, the error in the thread deposit position can actually be limited to ΔZ. Inaccuracies in the thread deposit are thus completely recorded and can be corrected with the controller. This succeeds because Z _{soll is} a fully calculated quantity that initially does not have any systematic error. This is a fundamental difference to the prior art methods for controlling traversing, in which inaccuracies that cannot be avoided or can only be avoided and / or reducible with great effort and that are based on the detection of speeds of the winding movement and the traversing movement can occur . Such inaccuracies may _want to unknown differences between Z and Z _is lead, which can be avoided only by the very exact maintenance of speeds.

The use of a controller to control the traversing thread guide position based on the calculated value Z _soll is thus a new approach that can lead to a significantly improved quality of the thread deposit during winding and / or that can be used to measure the complexity of the monitoring of the accuracy Reduce speeds.

Also described here is a control device for controlling a traversing thread guide of a device for winding bobbins set up to carry out the described method, having at least one first control module for calculating the traversing thread guide control _{angle ϕ traversing,} based on a detected winding angle ϕ _bobbin and a second control module for calculating an axial thread tray set position _to Z using the traversing thread guide-control angle φ _{traversing, tax.}

The control device is preferably a module which can be used in a winding device in order to control the traversing thread guide. The control device is preferably set up to receive K values (in particular a K value table) and to take them into account when controlling the traversing thread guide. For this purpose, the control device preferably has an input to which the K-value table can be transmitted. In other design variants, it is also possible that the control device has an input via which the "currently" K value to be used is specified for the control device. If necessary, the control device can have an output at which a selection parameter is provided with which the "current" K value can be selected externally from the control device by another control device or a higher-level control device.

It is particularly advantageous if the control device further comprises a controller which is adapted to an existing thread tray position Z to _be received, and based on the present _is thread tray position Z and the thread tray target position Z _to an output for the regulated control of the thread tray to produce.

It is also advantageous if the control unit has a common timer which is used for detecting the winding angle ϕ _bobbin , with no further timer for controlling the traversing yarn guide.

In addition, a coil is to be described here which is manufactured according to the method.

Spools wound with the method described are characterized, in particular, by a particularly exact adherence to the desired thread deposit position Z _soll with Z _ist the end. The accuracy of the yarn-delivery position Z _is effected in particular smooth end faces of the wound coil and a uniform surface of the coil.

Particularly advantageous is the coil when tolerance deviations between an axial thread tray actual position Z _and an axial thread tray target position Z _should along the thread and the winding angle φ _coil are equally distributed and in particular no proportionality between the winding angle Ω _coil and such tolerance deviations occur.

The described method can be achieved in particular that the error in the axial thread tray actual position Z _is can be fully taken into account in the form of .DELTA.Z and may be based on this error, a controlled deposition of the thread. In the previously common methods for controlling the traversing speed, systematic errors could arise due to small deviations in the time recording and also the speed recording, which could run up during the winding process (in particular while maintaining a K value). Such errors can no longer arise. A fundamental divergence of the traversing position and the angular position during winding can no longer occur if the control described here takes place with ΔZ ale input variable of the controller. Therefore, a relatively narrow tolerance band for errors in the axial thread deposit can be specified, which is used _{quite evenly over the entire winding angle ϕ bobbin} for all coordinates of the thread.

Fig. 1:

eine Prinzipskizze zur Fadenablage mit einem Fadenführer bei einer Spule;

Fig. 2:

eine Prinzipskizze zur Spiegelbildung beim Wickeln von Spulen;

Fig. 3:

eine qualitative Darstellung des stufenweise veränderbaren K-Wertes in Abhängigkeit der Spulendrehzahl;

Fig. 4:

den Winkel ϕ_Spule und Z in Abhängigkeit der Zeit t gemäß Stand der Technik;

Fig. 5:

ein System aus einem Regler für das hier beschriebene Verfahren und der zu regelnden Strecke;

Fig. 6:

die Winkel ϕ_Spule und Z_soll≈Z_ist in Abhängigkeit der Zeit t gemäß einer Variante des beschriebenen Verfahrens;

The invention and the technical environment are explained in more detail below with reference to the figures. The figures show preferred exemplary embodiments to which, however, the invention is not limited. In particular, it should be pointed out that the size relationships shown in the figures are only schematic. Show it:

Fig. 1:

a schematic diagram for thread storage with a thread guide on a bobbin;

Fig. 2:

a schematic diagram for mirror formation when winding coils;

Fig. 3:

a qualitative representation of the stepwise changeable K-value as a function of the reel speed;

Fig. 4:

the angle ϕ _coil and Z as a function of time t according to the prior art;

Fig. 5:

a system consisting of a controller for the method described here and the system to be controlled;

Fig. 6:

the angle ϕ _coil and Z _soll ≈Z _is as a function of time t according to a variant of the method described;

FIGS. 1 and 2 each show schematic sketches for thread storage with a traversing thread guide 5 when winding a bobbin 2. When winding the bobbins 2, various things must be observed. A special feature is the so-called mirror formation, in which two thread sections of the thread are placed one on top of the other at an identical point in time. The thread deposit can be described with a thread coordinate 3, which describes the deposit point of the thread in the circumferential direction 4 of the bobbin with the winding angle ϕ _bobbin starting from a winding start 6. The winding start 6 can be understood as the beginning of the wound thread 1 on the bobbin 2. The winding angle ϕ _coil or an incremental of the winding angle dϕ _coil can be determined with rotation sensor 8, which is a winding counter and / or an incremental encoder and / or a combination may include. In the axial direction of the bobbin 2, the thread coordinate 3 can be described with Z, where Z (depending on how you look at it) can be determined directly on the bobbin 2 or on the traversing thread guide 5. In FIGS. 1 and 2 is indicated in each case by an inclined course of the thread 1 from the traversing thread guide 5 to the bobbin 2 that the thread 1 follows the traversing movement of the traversing thread guide 5 here. This can lead to deviations, depending on whether Z is determined on the bobbin 2 or on the traversing thread guide. The closer the traversing thread guide 5 is arranged to the bobbin 2, the less this effect is.

the Fig. 1 shows a bobbin in which a first winding layer 15 of windings 7 is being produced using the thread 1. Fig. 2 shows a situation in which a second winding layer 16 of windings 7 of the thread 1 is formed on the first winding layer 15. With the traversing thread guide 5 is each Z _is the thread tray according _to Z set.

the Fig. 2 shows the mirror formation in a very simplified way using an example. In the second winding layer 16 marked with dots, the thread 1 is deposited exactly on the winding 7 of the first winding layer 15. In the Fig. 2 a situation of mirror formation is thus indicated. From the in the Fig. 2 If the mirror formation is indicated, technical problems arise because threads lying directly on top of one another or next to one another tend to adhere to one another, which in turn leads to problems during unwinding, the so-called pulling off of the bobbin, and must therefore be avoided at all costs. Fig. 2 is a greatly simplified schematic representation of the problem of mirror formation. In actual design variants, the thread runs obliquely in all windings 7. Points of intersection of threads of different windings occur regularly.

As already indicated above, the Fig. 2 The mirror formation described can be avoided by strictly adhering to K values. A K-value table, as it can be used for the formation of a step precision winding, is in Fig. 3 shown schematically. K values are plotted on the vertical axis, which change in steps depending on certain parameters (here speed n _coil or frequency f _{coil of} the coil.

Fig. 4 shows the winding angle ϕ _bobbin (t), which increases continuously as the bobbin is wound as a function of time. The winding angle ϕ _coil (t) is shown here as a continuously increasing value, which also has a constant speed or angular speed Ω _coil . The actual situation is somewhat more complex, especially when the thickness of the coil D _{coil changes} as a result of the formation of further windings during winding. In this respect, this representation is in Fig. 4 only schematically, in fact the winding angle ϕ _coil (t) will increase more and more slowly with increasing time as a result of the increase in the thickness of the coil D _coil.

Fig. 4 also shows the thread deposit position Z (t) when winding the bobbin - also schematically as an infinitely continuous parameter that increases continuously and proportionally with the winding angle. Such a description of the thread deposit position is conceivable, for example, if the movement actually occurring as a back and forth movement of the traversing thread guide is unfolded to a certain extent and is viewed as an infinitely continued movement in only one direction. Technically, this corresponds, for example, to variants in which the traversing movement of the traversing thread guide is generated via an eccentric which carries out a continuously continued rotary movement which is then converted into the traversing movement. In particular, the conditions that arise in the manufacture of stepped precision windings are more complex, especially when the change in speed of the coil results in a different proportionality factor between the two changes in angle (bobbin to thread deposit) results in (change in K-value). Has been simplified in Fig. 4 ϕ _Coil (t) drawn as a straight line. Since Ω _coil becomes smaller and smaller with increasing coil diameter, this representation is simplified and it only applies to short time intervals of the winding process in which the thickness of the coil D _coil does not increase to a relevant extent.

According to the Fig. 4 it should be indicated that Z (t) is only _{adhered to if the speed when winding speed Ω coil} or the speed V is strictly adhered to. There is no direct calculated relationship between ϕ _bobbin (t) and Z (t), but only an indirect relationship through the compliance with the angular velocity of the bobbin Ω _bobbin and the traversing speed V resulting from the K value, which kept constant here.

Fig. 5 shows a control device 10 for carrying out the method described here. The control device 10 is shown with the regulating section 21 (formed by the traversing thread guide 5 and an actuator 18 for moving the traversing thread guide 5 and possibly a sensor 19 for monitoring the position of the traversing thread guide 5. The control device 10 and the regulating section 21 together form a schematic device 11 for carrying out the method described here. As already indicated above, additional mechanical effects can occur when the thread is laid down, such as the thread trailing and the thread overshooting Fig. 5 have been neglected and they are of subordinate importance for the functioning of the method described here and the control device described here.

The control device 10 has various modules which, if necessary, can also be implemented with separate hardware, but which are preferably only in software are modeled and can optionally also be wholly or partially integrated into one another. There is a first control module 12 for determining ϕ _{traversing tax} and a second control module 13 for determining Z _should based on ϕ _{traversing tax} .

In preferred embodiments, the controller 10 may additionally include a control value formation 17 _{is intended} to form the control difference .DELTA.Z ₌ Z _{- Z} and comprise a controller. 9 The controller 9 generates an output signal 14 based on ΔZ or based on Z _soll and Zist, which is used as an input signal for the actuator 18 to drive the traversing yarn guide 5. All components belonging to the control device 10 are indicated here by a dashed line. The components of the control value generation 17 and of the controller 9 that are optionally integrated into the control device 10 are also shown here separated by a dash-dot line.

• Wickelwinkel ϕ_Spule;
• Winkelgeschwindigkeit Ω_Spule;
• Drehzahl der Spule n_Spule oder Frequenz der Spule f_Spule; oder
• Dicke der Spule D_Spule.

Process step a) is shown here by way of example, with which the winding angle ϕ _coil or a change in the winding angle dϕ _{coil is} detected. This can be done with the schematically indicated rotation sensor 8. Subsequently dφ _coil, or the _coil winding angle φ used in step b) calculating the traversing thread guide control angle φ _{traversing control.} In this case, K values are also taken into account, which come from a K value table 23 and which were preferably specified outside the control device 10 and are made available to the control device via a signal input 22. Optionally, the first control module 12 can detect or receive further input variables 20, in particular for performing method step b). For example, it is possible to record the following additional input variables:

• Winding angle ϕ _coil ;
• Angular velocity Ω _coil ;
• Speed of coil n _coil or frequency of coil f _coil ; or
• Thickness of the coil D _coil .

The one in the right part of the Fig. 5 The control loop shown consisting of the controller 9, the controlled system 21 and the control value generation 17 will always contribute to the system difference ΔZ ₌ Z _{soll -} Z _{is being made} to disappear and no incorrect angle errors add up.

Is in contrast to the previous solution, in which by a very precise compliance with the prescribed speed setpoints only achieved in that the angle error (which is the control difference φ _{traversing to} - φ _{traversing is} or Z _{is to} - Z _is the same as is) very slowly runs off can With the method described here, a (theoretically) exact control can be achieved with regard to possible angle errors. With every technical implementation of a control loop, the current actual value always fluctuates around the setpoint. Should a noticeable control difference arise, the traversing would always be influenced via the controller and actuator in such a way that this control difference is reduced or disappears.

While maintaining the tried and tested K value, the new solution aims to increase the precision of the thread deposit and at the same time to reduce the immense effort involved in recording and setting the speeds or frequencies f _bobbin and f _traversing . At the same time, the winding process is described in detail, which in turn enables simple quality control. The new core idea is not to focus on temporary speed values (Ω = Δ φ _coil / Δ t), but rather to capture the absolutely continuous angle values φ _coil them, thus the axial thread storage target position Z _{is supposed} to regulate.

The angular paths of the coil ϕ _coil and the traversing system Z can, for example, according to the current technical implementation with an initiator or a Incremental encoder are measured. With this measuring method, each new pulse signals that the angle has rotated further _{by dϕ coil} or Δ ϕ _{coil increment} . The incremental encoder can, for example, be a winding counter that counts every single revolution of the coil or partial revolutions of the coil.

The individual incoming pulses from the initiator or incremental encoder are then summed up in the processor by, for example, a QEP unit, which ensures that no angle information is lost and that the correct angular path ϕ _coil is always available.

The example operated via a controller / inverter driving the Chan Passengers can nit of the torque or speed to be influenced with regard to so that hereby Z _is may be influenced and the desired thread tray position Z _will be updated and maintained.

In the Fig. 5 in addition to the first control module 12 b for performing the method steps a) and c) and for the determination of the traversing thread guide-control angle φ _{traversing, controlling} the second control module 13 shown in which the conversion of the traversing thread guide-control angle φ _{traversing, controlling} in the target size to control the thread deposit position Z _{is intended to} represent. This module can, for example, be a proportional conversion of ϕ _{traversing control} to Z _should (in design variants Z _should be the angle ϕ _{traversing should} ). In alternative embodiments, this module may also have a conversion of the (infinite) permanently increasing traversing thread guide-control angle φ _{traversing, controlling} to perform in a limited size, for example, describes the coordinate Z in the storage area of the yarn on the spool. This conversion can be done with a modulo operation, for example.

Fig. 6 shows the continued rising angle φ _coil and the yarn-delivery position Z _should ≈Z _is a function of time t as can be controlled with the methods described herein.

• Das neue Verfahren regelt auf die Differenz zwischen dem Soll- und Istwert und verhindert durch diese Regelung dauerhaft ein "Weglaufen" des Winkelwertes. Eine höhere Präzision bei der Fadenablage ist die Folge, welche zudem effektiv die Spiegelbildung verhindert.
  (Bei dem bisherigen Verfahren wurde mit hohem Aufwand eine hohe Präzision bei der Drehzahlregelung erreicht, so dass der Winkelwert zwischen Soll- und Istwert nur langsam wegläuft. Eine Messung der Winkeldifferenz oder gar eine Regelung auf die Winkeldifferenz ist bisher nicht vorhanden, vielmehr handelt es sich bei der bisherigen Lösung bezüglich des Winkelwertes um Steuerung und nicht um eine Regelung!)
• Der technische Aufwand und damit die Kosten werden deutlich reduziert, da die bisherigen hohen Anforderungen an die Drehzahlregelung (Umrichter, Messwerterfassung, Regler) durch die Regelung des Winkelwertes deutlich reduziert werden.
• Die Erfassung der absoluten fortlaufenden Winkelwerte der Spule und Changier-Fadenführer-Steuerwinkel bei der gleichzeitigen Berücksichtigung einer Absolutzeit (jeweils beginnend mit dem Wickelvorgang) erlauben eine sehr detaillierte Beschreibung des realisierten Spulenaufbaus und ermöglichen damit einfache Qualitätskontrollen. Beispielsweise könnte jeder gewickelte Spule mit einem zugehörigen Datenfile vom Wickelvorgang ausgestattet sein.

It shows Fig. 6 the situation that occurs at a constant K-value. Fig. 6 shows the situation with a coil that is designed as a precision winding. Z _soll depends directly and mathematically exactly on ϕ _coil . No error can therefore occur between ϕ _coil and Z _should. Z _{ist is} calculated according to the in Fig. 5 The system structure shown is monitored with a sensor and can thus _be adjusted with a controller in accordance with Z should. A divergence of ϕ _coil or Z _should and Z _is therefore not technically possible, so that the desired precision is achieved here.

• The new method regulates the difference between the setpoint and actual value and, through this regulation, permanently prevents the angle value from "running away". The result is a higher level of precision when laying the thread, which also effectively prevents mirror formation.
  (In the previous method, a high level of precision in the speed control was achieved with great effort, so that the angular value between the setpoint and actual value only slowly drifts away. A measurement of the angular difference or even regulation of the angular difference is not yet available, rather it is with the previous solution with regard to the angle value to control and not to regulate!)
• The technical effort and thus the costs are significantly reduced, since the previous high requirements for speed control (converter, measured value acquisition, controller) are significantly reduced by regulating the angle value.
• The acquisition of the absolute continuous angular values of the bobbin and traversing thread guide control angle with the simultaneous consideration of an absolute time (each beginning with the winding process) allow a very detailed description of the realized bobbin structure and thus enable simple quality controls. For example, each wound coil could be provided with an associated data file from the winding process.

List of reference symbols

1

thread

2

Kitchen sink

3

coordinate

4th

Circumferential direction

5

Traversing thread guide

6th

Start of winding

7th

Winding

8th

Rotation sensor

9

Regulator

10

Control unit

11

contraption

12th

first control module

13th

second control module

14th

Output signal

15th

first winding layer

16

second winding layer

17th

Control value generation

18th

Controller

19th

sensor

20th

Input variables

21

Controlled system

22nd

Signal input

23

K-value table

ϕcoil

Winding angle

ϕChangier, tax

Traversing thread guide control angle

Tariff

axial thread deposit target position

ϕChangier, should

Traversing thread guide target angle

Ω coil

Angular velocity of the spool

ncoil

Speed of the spool

D coil

Thickness of the coil

K

K value

fcoil

Frequency of the coil

Cist

actual axial yarn deposit position

V

Traversing speed

Claims (12)

Method for high-precision thread deposition of a thread (1) when winding a bobbin (2), comprising the following steps: a) Permanent detection of a winding angle ϕ _bobbin or a precursor value from which the winding angle ϕ _bobbin can be calculated, the winding angle ϕ _{bobbin describing} a coordinate (3) of the thread (1) in a circumferential direction (4) on the bobbin (2); b) calculating a traversing thread guide-control angle φ _{traversing, controlling} a function of the winding angle φ _coil and / or the precursor value, wherein the traversing thread guide control angle φ _{traversing, controlling} φ from the winding angle of _coil and / or the precursor value in consideration of at least one K-value is calculated; c) Use of the traversing thread guide-control angle φ _{traversing, controlling} for calculating an axial thread tray set position _to Z on the spool (2); d) Controlling a traversing thread guide (5) according to the axial thread storage target position Z _should for high-precision thread storage at the _{coordinate described with the winding angle ϕ bobbin} on the axial thread storage target position Z _should . Method according to claim 1, wherein the winding angle ϕ _{bobbin is} the coordinate (3) of the thread (2) in the circumferential direction (4) on the bobbin (2) starting from a start of winding (6) of the thread (1) on the bobbin (2) describes continued over all windings (7) of the coil (2). Method according to claim 1 or 2, wherein a deposit of the thread (1) at the target position Z _{soll is defined} via a traversing thread guide setpoint angle ϕ _{chan-gier, soll} , which describes an adjustment angle of the traversing thread guide (5), which causes a thread deposit at the axial thread deposit target position Z _soll . Method according to one of the preceding claims, wherein _{a rotation sensor (8) is used to determine the winding angle ϕ coil} in step a) which indicates the number of revolutions and / or partial revolutions of the coil (2). Method according to one of the preceding claims, wherein the angular velocity Ω _{coil of} the coil (2) during winding during the winding of the coil (2) as a function of the increasing thickness of the coil D _coil ; is adapted in such a way that a constant thread speed is achieved in upstream processing steps of the thread (1). Method according to one of the preceding claims, wherein a plurality of K values are used when winding the coil (2), which are determined according to a predetermined scheme as a function of at least one of the following parameters: - winding angle ϕ _coil ; - angular velocity Ω _coil ; - speed of the coil n _coil or frequency of the coil f _coil ; or - Thickness of the coil D _coil . Method according to one of the preceding claims, wherein in step d) is controlled by a controller (9) traversing thread guide (5) and afford a present yarn laying position Z _and / or a present traversing thread guide angle φ _{traversing is is monitored and the control difference ΔZ =} Z _{soll -} Z _ist and / or Δϕ _chan-gier = ϕ _{traversing, set} - ϕ _{traversing, is} calculated as the input variable for the controller (9). Control unit (10) for controlling a traversing thread guide (5) of a device (11) for winding bobbins set up to carry out a method according to one of claims 1 to 7 having at least one first control module (12) for calculating the traversing thread guide control angle φ _{traversing, controlling} based on a detected winding angle φ _coil and a second control module (13) for calculating an axial thread tray set position _to Z using the traversing thread guide-control angle φ _{traversing, tax.} Control device (10) according to claim 8, additionally having a controller (9), which is set up _{to receive a present thread storage target position Z oll} and thread storage actual position Z _is to be received and based on the existing thread storage target position Z _soll and the thread storage actual position Z _is to generate an output signal (14) for the regulated control of the thread deposit. Control apparatus (10) according to claim 8 or 9 comprising a common timer of φ for the detection of the winding angle and Z _{coil is} used, wherein no further timer for controlling the traversing yarn guide exists (5). Spool (2) with a thread (1), wound according to a method according to one of Claims 1 to 7. Coil (2) φ _coil are distributed equally according to claim 11, wherein tolerance deviations between an axial thread tray actual position Z _and an axial thread tray target position Z _should along the thread (1) and the winding angle.

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