EP1749907B1 - Method for controlling the draft in a drafting area of a textile machine, and the textile machine - Google Patents

Description

The present invention relates to a method for controlling the draft of a drafting field of a textile machine and a textile machine according to the preambles of the independent claims.

Essential for the control of the delay of a default field of a textile machine is the location of the so-called Regeleinsatzpunktes. The Regeleinsatzpunkt is a predetermined location at which an upstream of the default field measured in terms of its length-specific mass measured portion of a Fasergemenges, if necessary to equalize the length-specific mass control intervention in the delay of the default field. The location of the Regeleinsatzpunktes can be specified, for example, as its distance from the measuring point. Such an indication ultimately indicates the distance which a certain section of the fiber amount travels from the measuring location to the point of delay. Alternatively, the location of the Regeleinsatzpunktes as running time, which requires a certain portion of Fasergemenges from the measurement site to the default location, can be specified. Both details are synonymous technically equivalent. For conversion, only the speed of the fiber amount must be known.

From the DE 10 041 892 A1 a method for controlling the delay of a default field on a Regulierstrecke is known, wherein a set value is determined for the Regeleinsatzpunkt in a pre-operational test or Einstellauf. For this purpose, various control application points are set in succession on a trial-by-trial basis, with several CV values having a different reference length of the fiber quantity leaving the default field being determined at each trial set point of use. The CV values determined at a certain control point are added together to obtain a quality index. The quality indices determined at the different experimentally set control points are then used to form a polynomial of the 2nd degree, the minimum of which is determined by means of numerical methods and considered to be the optimal control point.

A disadvantage of the by the DE 100 41 892 A1 The disclosed method is that it only leads to a unique and sufficiently accurate set point for the Regeleinsatzpunkt when the actual course of the applied over the Regeleinsatzpunkt quality metrics is parabolic. However, this is rarely the case in practice. The thus found rule use point therefore deviates more or less from the optimal rule use point.

Furthermore, it is disadvantageous that the formation of a polynomial and the determination of the minimum of the polynomial is associated with a high computational complexity. This requires the provision of relatively large computing capacities, which makes the textile machine undesirably more expensive.

Furthermore, it is disadvantageous that in the determination of control application points prevail during a pre-operational test or Einstellaufs operating parameters that match the present during the production phase of the textile machine operating parameters only rarely. In other words, the control point determined by means of the method described above differs in principle from the optimal control point in the production phase of the textile machine. This in turn leads regularly to a sub-optimal quality of the discharged from the default field fiber amount.

The object of the present invention is thus to provide a method and a textile machine which avoid the disadvantages mentioned.

The object is achieved by a method and a textile machine with the features of the independent claims.

In the method according to the invention, a procedure for dynamically adapting the control point of application to changing operating parameters is carried out at least once in a production phase of the textile machine.

The term operating parameter includes all boundary conditions which are relevant for the operation of the textile machine, in particular for the delay of the default field. This includes in particular properties of the textile machine or individual components thereof. By way of example, reference is made to the maintenance status or the temperature of the textile machine or individual components thereof.

Further operating parameters are the properties of the supplied fiber amount. In this case, for example, the shape of the submitted Fasergemenges of importance. For example, it may be present as one or more slivers or as a non-woven fabric. The fiber material, such as cotton or synthetic materials or mixtures thereof, diameter and length of the fibers and their arrangement in the amount of fiber, which can be described inter alia by the degree of parallelization, are relevant operating parameters. Also is the Feeding rate of the delay field supplied amount of fiber for the choice of the Regeleinsatzpunktes important.

Furthermore, the term operating parameter includes environmental conditions, such as the ambient temperature or the humidity.

A production phase of the textile machine means a period during which a quantity of fiber intended for further processing is removed from the drafting zone.

As part of the procedure, a plurality of different test rule application points are selected and used to determine at least one measurement result of at least one quality-determining quantity of the amount of fiber discharged from said default-action-delayable default field. The at least one quality-defining variable may, for example, be the CV% value with a standard or a different reference length. Also conceivable, however, are quality-defining quantities which are derived from one or more CV% values. Each of the test rule insert points is set within a procedure at least once each at least as long as required to determine the at least one selected quality-indicating quantity at the respective test rule insertion point. The order in which the once selected test rule insert points are set is basically insignificant. Nevertheless, a specific adjustment pattern can be specified.

The actual adaptation of the Regeleinsatzpunktes then takes place on the basis of an evaluation of the determined measurement results of at least one quality-characterizing size. The dynamic adaptation of the Regeleinsatzpunktes can either by maintaining the previous Regeleinsatzpunkt or by a correction of the previous Regeleinsatzpunktes on one side or the other.

By evaluating the determined measurement results of the at least one quality-defining variable, that is to say by considering the result of the drafting process, all relevant operating parameters can be taken into account in the selection of the control application point. It is neither necessary that the relevant operating parameters are identified, nor that they are determined numerically. In other words, the implementation of the method according to the invention leads to an optimization of the Regeleinsatzpunktes during operation of the textile machine, even if operating parameters change, with neither the knowledge of the basic relationship between the operating parameters and the optimal Regeleinsatzpunkt nor the knowledge of the current value of the operating parameter required is.

Advantageously, the previous rule insert point is used as one of said test rule insert points. In this case, a measurement result of the at least one quality-indicative variable can be determined without having to use a test control point that deviates from the previous control point of use. Furthermore, the evaluation of the determined measurement results is simplified, since it is easily recognizable whether a change in the regular use point will lead to an improvement in the quality of the discharged fiber amount.

Advantageously, at least one test control point located upstream of the previous control point and at least one test control point downstream of the previous control point are used. Thus, it can be determined in a simple manner, whether an upstream or downstream correction of the previous Regeleinsatzpunktes makes more sense.

Advantageously, at least one pair of test rule insert points is used which is arranged symmetrically to the previous rule insert point. A symmetrical arrangement means that the upstream test control point and the downstream test control point have the same distance from the previous control point. This facilitates the evaluation of the determined measurement results.

Particularly preferably, said test control points are chosen so that a significant deterioration in the quality of the discharged from the default field fiber amount is avoided during their use. A substantial deterioration in the quality of the amount of fiber removed is understood to mean a deterioration in quality which limits or makes impossible the further processing of the amount of fiber produced during the procedure.

The said test control points are preferably selected such that at least one quality-defining variable, for example the CV% value or a quantity derived therefrom, of the fiber amount discharged from the default field is not more than 15%, preferably not more than 10%, particularly preferably not more than 5%. , more preferably at most 2.5%, is changed. This ensures that no major leaps in quality occur during the execution of the procedure.

Furthermore, it is preferred if the said test rule insertion points are selected such that their maximum distance from the previous control insertion point is at most 20%, preferably at most 15%, more preferably at most 10%, particularly preferably at most 5%, of the length of the default field. Under the length of the default field is the distance the clamping lines of the drafting elements, for example, the drafting roller pairs understood. In this case, it is ensured that during the procedure, no sudden change, in particular no sudden deterioration, the quality of the discharged Fasergemenges is effected.

In particular, in the processing of short staple fibers, it has proven to be advantageous if the test rule use points are chosen so that their maximum distance from the previous Regeleinsatzpunkt is at most 12 mm, preferably at most 9 mm, more preferably at most 6 mm, more preferably at most 3 mm.

In an advantageous embodiment, the adjustment of the Regeleinsatzpunktes done so that the one of the test rule use points, which led to the best of said measurement results of at least one quality-indicative size is used after the procedure as Regeleinsatzpunkt. If the CV% value is used as the quality-indicative quantity, then that measurement result is the best which has the least amount.

In an advantageous further embodiment, the adaptation takes place as a function of the evaluation of said measurement results either as an acknowledgment of the previous Regeleinsatzpunktes or as a shift with a predetermined increment. A shift of the rule insert point means that the location in the default field at which the control operation for band equalization takes place is displaced further upstream or downstream (in relation to the transport direction of the fiber amount).

In this case, the increment is preferably set such that it is smaller than the maximum distance of the said test rule insert points from the previous one Regulating starting point. This ensures that an error in the determination of said measurement results and / or the evaluation of the same at most a slight deterioration in the quality of the discharged Fasergemenges is effected. If, on the other hand, a shift of the control application point by a larger amount than the predetermined increment is actually required, this can be effected by performing the procedure several times.

The direction of the shift of the Regeleinsatzpunktes can be determined in a simple manner on the basis of the relative position of the Testregeleinsatzpunktes, which led to the best of the measurement results, compared to the previous Regeleinsatzpunkt.

Advantageously, the predetermined increment is at most 10%, preferably at most 7.5%, more preferably at most 5% or at most 2.5% of the length of the default field.

In the processing of short staple fibers, it has proven useful if the step size is at most 6 mm, preferably at most 4.5 mm, particularly preferably at most 3 mm, particularly preferably at most 1.5 mm.

Furthermore, it is advantageous if, within a said procedure, at least one of the test rule application points is detected, a plurality of individual measured values of at least one quality-determining variable, from the sum or average of which the respective measurement result is determined. As a result, a random deviation of the determined measurement result from the true value of the quality-indicative variable is reduced while minimizing the effect of individual outliers.

Particularly preferred is the adaptation of the Regeleinsatzpunktes based on a comparison of the amounts of the determined measurement results, which possibly determined from several Einzelmeßwerten carried out. A complex determination of a function, for example a polynomial, can thus be avoided.

It is advantageous if several sequences are carried out within a said procedure, wherein within a said sequence, each of the test rule use points associated with the respective procedure is set at least once to determine at least one single measurement value. The individual measured values belonging to a particular test control application point are determined with a time interval, which leads to a more accurate measurement result.

Within a said sequence, the order of the test rule insert points can be selected at random. It is essential, above all, that at least one individual measured value is determined for each test control point of use. However, the sequence preferably corresponds to a predetermined adjustment pattern. This predetermined adjustment pattern is preferably used for all sequences of at least one procedure.

For example, a setting pattern can be specified in which first the test rule insert point is set which corresponds to the previous control insert point, then a test control insert point located downstream of the previous control insert point and then a test control insert point located upstream of the previous control insert point. Of course, this adjustment pattern could also be applied in reverse order. Just as well, however, the test rule usage points could be adjusted sequentially according to their spatial location. In other words, the one test control point located farthest upstream (or downstream) is set first, then its immediate neighbor and then its immediate neighbor, and so on.

In a particularly advantageous manner, the procedure is controlled by a control device of the textile machine. As a result, the user effort can be reduced.

However, it can be provided that the procedure is started or initiated manually by an operator intervention. For example, a manual initiation of the procedure may be done if the operator, on the basis of his experience, considers this necessary.

Alternatively or, which is preferred, it may additionally be provided that the procedure is automatically initiated upon a change in one or more operating parameters, in particular in the event of a change in the properties of the textile machine and / or the amount of fiber supplied and / or the ambient conditions. In principle, any operating parameter can be used to automatically initiate the procedure. The only requirement is that the respective operating parameter is monitored during the production phase of the textile machine. The initiation preferably takes place by the control device of the textile machine. Alternatively, the initiation could be initiated by a higher-level control device, for example by a system controller.

Particularly preferably, the procedure is automatically initiated upon a change in the feed rate of the amount of fiber supplied to the drafting field or upon a change in the discharge rate of the amount of fiber discharged from the default field. Such an initiation of the procedure is particularly advantageous, since the optimal and thus the desired control application point depends essentially on the respective speeds.

Of particular importance here are in particular speed changes, which are not caused by a control intervention for delay change. Such changes in speed, which occur both on the feed side and on the discharge side, arise, for example, in a start-up phase of the textile machine and often also in a can change of a downstream can storage device. Also, changes in speed may occur without distortion change if the amount of fiber supplied to the drafting field is supplied directly by a fiber-fabric-producing textile machine, for example a carding machine. In a change in the operating speed of the fiber forming machine, it is inevitably necessary to adjust the operating speed of the drafting elements of the drafting field to ensure the required synchronicity of the two textile machines. This also applies in particular to a modular or compound machine in which the default field is connected downstream of a fiber-generating module. By way of limitation, it should be noted that an adaptation of the control point during a speed change makes sense only if the change in the speed acts for a period which is longer than the time required for a procedure for adapting the control point of use.

Likewise, it is advantageous if the procedure is automatically initiated by a quality change, which is detected by a quality detection device arranged upstream of the default field, preferably by the control device. As a result, changes in the amount of fiber presented in the frequency and / or amplitude range can be taken into account immediately when they occur when determining the control application point. As a result, an improvement in the quality of the amount of fiber discharged from the drafting field can be achieved.

Furthermore, it is possible for the procedure to be initiated automatically at a quality change determined by a quality detection device of the textile machine arranged downstream of the default zone, preferably by the control device. As a result, changes in an operating parameter, which itself is not detected, can be taken into account.

It is also advantageous if the procedure, preferably by the control device, regularly, for example, after a certain period of time or after a certain length of the supplied Fasergemenges or after a certain length of the discharged Fasergemenges, initiated. In this way, in particular a gradual deterioration of the quality of the discharged fiber amount can be avoided.

Advantageously, the procedure is automatically repeated after a said initiation until there is no further improvement in the quality of the amount of fiber discharged from the default field. A multiple sequential implementation of said procedure is particularly useful if one or more of the operating parameters change to a greater extent. Likewise, the multiple execution makes sense if the adaptation in the context of a single procedure takes place as a shift with a relatively small step size. In this case, it is ensured that the rule insert point is postponed until it is at least close to the optimal rule insertion point.

Likewise, it is advantageous if jumps caused by thick areas in the amount of fiber supplied are not used in the at least one quality-determining quantity of the amount of fiber discharged from the arrears field to adapt the control application point. Under a thick spot is a temporary increase in the length-specific mass be understood of the supplied fiber amount. Such thick spots occur more or less frequently and randomly in the amount of fiber supplied. In particular, if a thick patch has only a small longitudinal extent, for example a few cm or dm, it is not appropriate to adapt the position of the control point of application to these only briefly present operating parameters. Thick areas can be detected by means of the upstream of the default field arranged sensor device.

If a thick spot is detected, a pending procedure can be interrupted or reinitiated. The pending procedure is continued or restarted at the earliest when the thick spot has left the location where the at least one quality-indicative variable is detected. For example, a specific time delay can be predetermined for this purpose.

If, during the passage of a thick spot, a measurement result of the at least one quality-determining variable has been detected, this is discarded and detected again after the continuation of the procedure. Similarly, the initiation of a pending procedure may be temporarily suspended.

It is particularly advantageous if the respectively last used control point is secured manually, cyclically and / or event-controlled in a non-volatile memory. With manual backup, the current policy point is transferred to non-volatile memory by an operator action. By contrast, the transmission is carried out automatically in a cyclic backup, for example, after a certain time or after the passage of a certain length of the supplied or discharged fiber amount. Even with an event-controlled backup, the transfer of the current control point to the non-volatile memory is automatic. For this purpose, various triggering Be provided for events. Thus, the backup can be provided for example after a successful adaptation of the Regeleinsatzpunktes or after performing a certain number of procedures performed.

By securing the used Regeleinsatzpunktes this is for a temporary interruption of the operation of the textile machine, which may be caused for example by a power failure, a required maintenance or by a fault, immediately available for reuse.

In a textile machine according to the invention, the control device is designed so that in a production phase of the textile machine, a procedure for dynamically adapting the Regeleinsatzpunktes to changing operating parameters is feasible. The term operating parameter has already been explained in connection with the method according to the invention. The adaptation of the control point of use can also be carried out on the basis of the measurement results of the at least one quality-determining variable determined by the quality detection device.

The control device is designed for the automatic specification of a plurality of different test rule application points. Thus, test rule points do not need to be cumbersome to an operator. Furthermore, the control device is designed to evaluate the measurement results determined by the quality detection device at the different predetermined test control application points.

Furthermore, the textile machine can be designed to carry out further exemplary embodiments of the method according to the invention. It then results in the advantages described above.

Figur 1

eine Verbundmaschine umfassend eine Karde und eine Strecke;

Figur 2

eine vergrößerte Darstellung eines Teils der Strecke;

Figur 3

beispielhaft die Durchführung des Verfahrens im Zeitverlauf, und

Figur 4

ein weiteres Beispiel der Durchführung des erfindungsgemäßen Verfahrens.

Further advantages of the invention are described in the following exemplary embodiments. Show it:

FIG. 1

a composite machine comprising a card and a track;

FIG. 2

an enlarged view of part of the route;

FIG. 3

exemplifying the implementation of the method over time, and

FIG. 4

a further example of carrying out the method according to the invention.

FIG. 1 shows a textile machine 1, more precisely, a spinning preparation machine 1, which is formed as a composite machine 1, comprising a carding machine 2 and a track 3.

The carding machine 2 is of conventional design and has the following schematically illustrated working areas: a material supply 14, a feed device 21, a licker-in zone 15, a spool 16 with associated mapping elements 17, a pickup zone 18 and a pickup device 19. The essential object of a carding machine 2 in the Short staple spinning is to form from the carding 2 fiber flakes presented a homogeneous amount of fiber FG in the form of a sliver.

In a conventional spinning preparation line, the sliver produced by the card 2 is deposited in a container, a so-called pot, which is then brought to a subsequent spinning preparation machine, in particular to a combing machine or a track.

In the FIG. 1 on the other hand, card 2 and segment 3 form a functional unit. The fiber quantity FG formed by the carding machine 2 is delivered to the line 3 directly, that is to say without depositing into a jug. The amount of fiber FG is guided in the running direction LR initially through a sensor device 11, then through a drafting device 4 and through a funnel 12. Downstream of the funnel 12, the amount of fiber is deposited by means of a belt depositing device 5 in a spinning can 6. Alternatively, the amount of fiber downstream of the hopper 12 could be supplied directly to another spinning preparation machine or to a spinning machine.

The drafting arrangement 4 has an input roller pair 7, a middle roller pair 8 and a delivery roller pair 9. The speed of said roller pairs 7, 8, 9 increases in this order. As a result, the amount of fiber is distorted both in the default draft field VVF, which is formed between the input roller pair 7 and the middle roller pair 8, as well as in the default field VF, which is formed between the middle roller pair 8 and the delivery roller pair 9. The speed of the roller pairs 7, 8, 9 can be controlled by a control device 10. The control device 10 is on the one hand designed so that they can change the rotational speeds of all roller pairs 7, 8, 9 in the same ratio, it is referred to a change in the base speed, and on the other hand, that they can change the speed ratio of the middle roller pair 8 and the delivery roller pair 9 , By contrast, the speed ratio of input roller pair 7 and middle roller pair 8 remains constant. In the exemplary embodiment of FIGS FIG. 1 Thus, the delay of the default delay field VVF is constant, which is why the Vorverzugsfeld is also assigned no Regeleinsatzpunkt, while the delay of the default field VF is changeable.

It would also be conceivable that the delay in the upstream Vorverzugsfeld VVF is controllable in default or that no Vorverzugsfeld VVF would be present. Essential to the present invention is merely that at least one default field with controllable delay exists.

A delay change, also called control intervention, is carried out with the aim that to the drafting 4 supplied amount of fiber FG _to even. For this purpose the length specific mass of the supplied in the draft device 4 fiber mixture FG _becomes detected by the sensor device 11 in sections. The individual measured sections usually have a length of a few mm. For each measured section, a measured value MW is generated by the sensor device 11, which is then transmitted to the control device 10. To generate the measured values MW, the sensor device 11, as indicated, may comprise, for example, a pair of feeler rollers. However, sensor devices which operate according to other physical principles are also possible. Furthermore, it is conceivable that correction methods, for example for eliminating disturbances, are used when determining a measured value. Based on a measured value MW, it is possible to determine a corresponding amount of the distortion change by the control device 10. This is not precluded if, in addition, other data are used to determine the amount of the delay change.

A control, in which the measuring location or the sensor device 11 is located in front of the drafting system, is also called open-loop control. With such control, it is necessary to take into account the running distance or the running time of a portion of the fiber mixture _to FG from the sensor means 11 to the point at which the control action is to take place. Running distance and transit time are linked _to each other via the speed of the supplied fiber band FG.

The location where the control action is to take place with respect to a certain portion of the fiber amount is called the rule usage point. It is usually located in the upstream third of the default field VF. The exact position of the Regeleinsatzpunktes can be specified by a set value to the controller 10. Since the optimal position of the Regeleinsatzpunktes can not be determined analytically with sufficient accuracy, according to the prior art, a default or set value for the Regeleinsatzpunkt determined in a pre-operational adjustment or test run and for a longer period, for example until a game change, constant held.

On the other hand, according to the present invention, at least once in a production phase of the textile machine 1, a procedure for dynamically adjusting the rule insert point is performed. For this purpose, the quality of the drafting zone VF leaving fiber mixture FG is _from by means of a quality detection means 12, detected. 13 This includes the downstream of the default field arranged funnel 12, which is designed as a measuring funnel 12, and an evaluation unit 13, which is designed to evaluate a signal S, which is generated by the measuring funnel 12 and with a parameter, for example, with the length-specific mass of the discharged Fasergemenges FG _from corresponding. The evaluation unit 13 converts the signal S into measurement results of at least one quality-determining variable, for example the CV% value or a variable derived therefrom, and transmits these measurement results M to the control device 10. Here, they can be used to adapt the control application point RP in accordance with the invention ,

FIG. 2 shows an enlarged view of a portion of the track 3. The drafting zone the fiber mixture FV supplied _to FG consists of successively arranged portions. By the reference AB _n is the portion measured in the moment shown by the sensor device is called. Downstream of section AB _n is section AB _n-1 , upstream section AB _{n + 1} . For reasons of simplification, the further sections are not designated by reference symbols. For each of the sections at least one measured value MW is determined, which corresponds to the length-specific mass of the respective section and which is transmitted to the control device 10. When the measured section AB _{n reaches} the control point RP, ie the position designated AB ' _n , a corresponding control intervention is initiated by the control device 10. If the section AB _{n has,} for example, a length-specific mass lying above the average, then an increase in the delay to equalize the fiber quantity FG is initiated.

The position of the control application point RP is usually indicated as the distance A of the control application point from the sensor device 11. The control device 10 is designed so that the distance A in a certain, indicated by a double arrow area, can be predetermined. The predetermined position of the control application point RP and the predetermined distance A is critically _on the quality of the discharged from the drafting zone VF fiber mixture FG. The optimum position of the control point RP, in short the optimal control point RP depends on a variety of operating parameters. These operating parameters also change continuously during the production phase of the textile machine 1. According to the invention, therefore, a procedure is provided, during which the control point RP is adapted to changing operating conditions during the production of the textile machine. Within the scope of such a procedure, at least one measured value M of a quality-determining quantity of the discharged fiber quantity FG _{ab is} determined at different test rule application points. These measured values M are evaluated by the control device 10 and form the basis for the specification of a new control application point RP after completion of the procedure.

Such a procedure can be initiated manually, periodically and / or event-oriented. Such a triggering event _can be, for example, a change in the speed of the fed to the drafting zone the fiber mixture FG, wherein the speed of G may for example be additionally detected by the sensor device 11 and transmitted to the control device 10th

Another possible triggering event may be _from a change in the quality of the discharged from the drafting zone the fiber mixture FG. For this purpose, it is only necessary to record measured values M of the at least one quality-determining quantity of the discharged fiber quantity FG _from outside a procedure and to transmit them to the control device 10. Also, a procedure may be initiated when a change in the quality of the drafting zone FV supplied fiber mixture FG _to occur. To this end, a quality detection means 20 may be provided which calculates the quality of the supplied fiber mixture _to FG based on with the mass of the supplied fiber mixture FG corresponding _to measured values MW and transmitted to the control device 10th

Furthermore, a non-volatile memory 22 for securing the respectively last used Regeleinsatzpunktes R ₀ , R ₁ R ₂ R _{3 is} shown. As a result, the last used Regeleinsatzpunkt R ₀ , R ₁ R ₂ R _{3 is} available after a restart of the textile machine 1 for immediate reuse. It then does not have to resort to a default value. The non-volatile memory 22 may be integrated as shown in the control device 10 of the textile machine or formed separately.

The timing of an adjustment of the rule use point is in FIG. 3 exemplified. On the common time axis t are in the upper Part of the distances A of the Regeleinsatzpunkte RP or the test rule use points T from the sensor device 10 and in the lower section the CV% values of the discharged Fasergemenges FG _from and the detected by the quality detection means 12, 13 measured values M shown. In the initial situation, a control application point RP _{0 is} predetermined, the distance to the sensor device 10 being 1000 mm as an example. With the start of the procedure P ₁ , a test rule entry point T _{11 is} specified, which corresponds to the previous rule entry point RP ₀ . In this case, a measurement result M ₁₁ is detected with the value 2.1. At a further downstream test control application point T ₁₂ , a further measurement result M ₁₂ with the value 2.15 is detected. Subsequently, a further upstream test control point T _{13 is} temporarily set, wherein a further measurement result M _{13 is} determined to be 2.02. Thus, within the procedure P _1, three measurement results M have been determined, which can now be evaluated.

Preferably, the evaluation is carried out by a simple comparison of the amounts of the measurement results M. It is readily apparent that in the present case, the measurement result M ₁₃ provides the best, because the smallest CV% value. It is also known that this measurement result M _{13 was determined} at the test rule use point T ₁₃ . The new Regeleinsatzpunkt RP ₁ can now be done by a shift of the previous Regeleinsatzpunktes RP ₀ by a constant amount .DELTA.A. The direction of the shift is upstream, since the test control point T _{13 is located} upstream of the previous Regeleinsatzpunktes RP ₀ . The new control point RP ₁ has a distance A of 997 mm from the sensor device 11.

Without or with a small time interval, another procedure P _{2 is} performed. The measurement results M ₂₁ , M ₂₂ and M _{23 determined here} lead to a further upstream displacement of the previous control application point RP ₁ by the constant increment ΔA. After Procedure P ₂ , a Regeleinsatzpunkt RP ₂ with a distance of 994 mm to the sensor device 11 is specified.

In the context of the subsequent procedure P ₃ , three test rule entry points T ₃₁ , T ₃₂ , and T ₃₃ are again used. However, since there is no further improvement in the measurement results M of the CV% value, the previous control application point RP _{2 is} retained as the new control application point RP ₃ . The new rule insert RP ₃ can now be maintained until a new procedure manually, routinely, z. B. after a production time of 1 hour, or is initiated event-driven.

In the embodiment of FIG. 3 For example, by performing a procedure P ₁ , P ₂ , P ₃ three times, the CV value can be improved by 0.1%. Only briefly, namely in the determination of the measurement result M ₁₂ , the CV% value is increased in the short term by 0.05%. All CV% jumps caused by the procedure are less than or equal to 0.13%. Therefore, it is readily possible to use the fiber mixture generated during or between procedures P _1, P _2, P ₃ FG _from readily pass. So no committee is produced.

FIG. 4 shows an example of a time course of a preferred embodiment of the method according to the invention. Shown is first a modified procedure P ' ₁ , which comprises carrying out a first sequence S ₁₁ and carrying out a second sequence S ₂₂ . During the execution of the first sequence S ₁₁ , each of the test rule entry points T ₁₁ , T ₁₂ and T _{13 associated} with the procedure P ' ₁ is temporarily set after a predetermined setting pattern. Thus, first of all the test control points T ₁₁ corresponding to the previous control point RP ₀ , then the test control point T ₁₂ located downstream of the previous control point RP ₀ and then the test control point T ₁₃ located upstream of the previous control point RP _{0 are} set.

However, another predetermined adjustment pattern or a randomly generated adjustment pattern could be used.

However, it is essential that at least one single measurement result, namely the individual measurement results EM ₁₁ , EM ₁₂ and EM _13, be determined for each of the test rule application points T ₁₁ , T ₁₂ and T _{13 associated} with the procedure P ' ₁ .

When carrying out the second sequence S ₂₂ , the same test control application points T ₁₁ , T ₁₂ and T ₁₃ are set again and further individual measurement results EM _'11 , EM' ₁₂ and EM _{'13 are} determined. Thus lie for the test control application point T _11, the Einzelmeßergebnisse EM ₁₁ and EM _'11, for the test control application point T _12, the Einzelmeßergebnisse EM ₁₂ and EM' _12, and for the test control application point T _13, the Einzelmeßergebnisse EM ₁₃ and EM _'13 in front.

The said test control application point T ₁₁ associated Einzelmeßergebnisse EM ₁₁ and EM _'11 in soft amount slightly from one another. The reason for this is, for example, errors in the acquisition or processing. However, these and other errors are at least partially compensated in their effect in the adaptation of the control application point RP ₀ , by forming the measurement result M _'11 used for this purpose from the two individual measurement results EM ₁₁ and EM' ₁₁ , wherein these are averaged or what in FIG. 4 not shown, can be added. In an analogous manner, the measurement results M _'12 and M' _{13 are} formed. The total of three available measurement results M _'11 , M' ₁₂ and M _'13 can then be used to adapt the Regeleinsatzpunktes RP ₀ as already explained above.

The above statements apply mutatis mutandis to the also in the FIG. 4 shown procedure P ' ₂ . If necessary, further procedures, not shown, may follow. It should also be noted that within a procedure, three or more sequences may be performed. As a result, the adaptation of the Regeleinsatzpunktes be further improved.

The present invention is not limited to the illustrated and described embodiments. There are modifications within the scope of the claims at any time. In particular, it should be noted that the numerical values given are exemplary in nature. In addition, the position and the number and also, if appropriate, the order of the predetermined test rule application points can be varied. Furthermore, the measurement results in FIG. 3 also be average values from different measurement results recorded immediately after one another. Likewise, in FIG. 4 the individual measurements are based on averaging. Also, the invention can be used in a Stecke, which is presented a variety of each withdrawn from tins slivers.

Claims (40)

1. Procedure for controlling of the draft of a drafting zone (VF) of a textile machine (1) preferably processing short staple fibres, especially of a spinning machine, for example of a ring spinning or a rotary spinning machine or a spinning preparation machine (1), for example of a carding unit (2) or drawing frame (3), or a composite machine (1), which for example covers a carding unit (2) and a drawing frame (3), in which
   the length specific mass of a section (AB_n-1, AB_n, AB_n+1) of a fibre mixture (FG_zu) fed to the drafting zone (VF) is recorded by means of a sensor device (11) upstream of the drafting zone (VF); and
   a control intervention in the draft of the said drafting zone (VF) required for levelling of the length specific mass of the fibre mixture feed (FG_zu) is carried out on the basis of the captured length specific mass of the section (AB_n-1, AB_n, AB_n-1), as soon as the section (AB_n-1, AB_n, AB_n+1) reaches a point specified as control application point (R₀, R₁ R₂ R₃);
   characterized by the fact that
   minimum once in a production phase of the textile machine (1) a procedure (P₁, P₂, P₃, P'₁, P'₂) is carried out for dynamic adjustment of the control application point (R₀, R₁, R₂, R₃) on changing operational parameters, especially on changing features of the textile machine (1) and/or of the fibre mixture feed (FG_zu) and/or on change ambient conditions, wherein a majority of different test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) are used, in order to obtain minimum one measurement result each (M₁₁, M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; M₃₁, M₃₂, M₃₃; M'₁₁, M'₁₂, M'₁₃; M'₂₁, Me₂₂, M'₂₃) of minimum one quality defining parameter, for example of the CV% value or a parameter derived from it, of the fibre mixture (FG_ab) carried off from the said drafting zone (VF) and wherein the adjustment of the control application point (R₀, R₁, R₂, R₃) is carried out based on an evaluation of obtained measurement results (M₁₁, M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; N₃₁, M₃₂, M₃₃; M'₁₁, M'₁₂, M'₁₃; M'₂₁, M'₂₂, M'₂₃).
2. Procedure as per claim 1, characterized by the fact that a said test control application point (T₁₁; T₂₁; T₃₁) is used, which corresponds to the existing control application point (R₀; R₁;R₂).
3. Procedure as per one of the above claims, characterized by the fact that minimum one test control application point (T₁₃; T₂₃; T₃₃) located upstream of the existing control application point (R₀; R₁;R₂) and minimum one test control application point (T₁₂; T₂₂; T₃₂) located downstream of the existing control application point (R₀; R₁;R₂) are used.
4. Procedure as per one of the above claims, characterized by the fact that minimum one pair of test control application points (T₁₂, T₁₃; T₂₂, T₂₃; T₃₂, T₃₃) is used, which is arranged symmetrically to the existing control application point (R₀; R₁;R₂).
5. Procedure as per one of the above claims, characterized by the fact that the said test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) are so selected that a major deterioration of quality of fibre mixture (FG_ab) carried off from the drafting zone during its use is avoided.
6. Procedure as per one of the above claims, characterized by the fact that the said test control application points (T_11, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) are so selected that minimum one quality defining parameter, for example the CV% value or a parameter derived from it, of the fibre mixture (FG_ab) carried off from the drafting zone is changed by maximum 15%, preferably maximum 10%, especially preferable by maximum 5%, especially preferable by maximum 2,5%.
7. Procedure as per one of the above claims, characterized by the fact that the said test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) are so selected that their maximum distance from the existing control application point (R₀; R₁;R₂) is maximum 20%, preferably maximum 15%, especially preferable maximum 10%, especially preferable maximum 5% of the length of the drafting zone.
8. Procedure as per one of the above claims, characterized by the fact that the said test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) are so selected that their maximum distance from the existing control application point (R₀; R₁; R₂) is maximum 12 mm, preferably maximum 9 mm, especially preferable maximum 6 mm, especially preferable maximum 3 mm.
9. Procedure as per one of the above claims characterized by the fact that the adjustment is carried out based on a comparison of amounts of obtained measurement results (M₁₁, M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; M₃₁, M₃₂, M₃₃; M'₁₁, M'₁₂, M'₁₃; M'₂₁, M'₂₂, M'₂₃).
10. Procedure as per one of the above claims, characterized by the fact that the adjustment is carried out in such a way that the particular test control application point (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃), which led to the best of the said measurement results (M₁₁, M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; M₃₁, M₃₂, M₃₃; M'₁₁, M'₁₂, M'₁₃; M'₂₁, M'₂₂, M'₂₃), is used according to the procedure (P₁, P₂, P₃, P'₁, P'₂) as control application point (R₁; R₂; R₃).
11. Procedure as per one of the above claims, characterized by the fact that the step size (ΔA) is smaller than the maximum distance of the said test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) from the existing control application point (R₀; R₁; R₂).
12. Procedure as per one of the above claims, characterized by the fact that the direction of shift of the control application point (R₀, R₁; R₂; R₃) is determined on the basis of relative position with respect to the existing control application point (R₀, R₁; R₂) of that particular point of the test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃), which led to the best of the said measurement results (M₁₁, M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; M₃₁, M₃₂, M₃₃; M'₁₁, M'₁₂, M'₁₃; M'₂₁, M'₂₂, M'₂₃).
13. Procedure as per one of the above claims. characterized by the fact that the step size (ΔA) is maximum 10%, preferably maximum 7.5%, especially preferable maximum 5%, especially preferable maximum 2.5% of the length of the drafting zone (VF).
14. Procedure as per one of the above claims characterized by the fact that the step size (ΔA) is maximum 6 mm, preferably maximum 4.5 mm, especially preferable maximum 3 mm, especially preferable maximum 1.5 mm.
15. Procedure as per one of the above claims, characterized by the fact that within a said procedure (P₁, P₂, P₃, P'₁, P'₂) in minimum one of the said test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) several individual measurement values (EM₁₁, EM'₁₁, EM₁₂, EM'₁₂, EM₁₃, EM'₁₃; EM₂₁, EM'₂₁, EM₂₂, EM'₂₂, EM₂₃, EM'₂₃; EM₃₁, EM'₃₁, EM₃₂, EM'₃₂, EM₃₃, EM'₃₃) of minimum one said quality defining parameter are captured, from the sum or average value of which the respective measurement result (M'₁₁, M'₁₂, M'₁₃; M'₂₁, M'₂₂, M'₂₃) is calculated.
16. Procedure as per claim 15 characterized by the fact that within one said procedure (P₁, P₂, P₃, P'₁, P'₂) several sequences (S₁, S'₁; S₂, S'₂) are carried out, wherein within each of the sequences (S₁₁, S₁₂; S₂₁, S₂₂) test control application point (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) belonging to each of the respective procedure (P, P₂, P₃, P'₁. P'₂) is set minimum once for the calculation of the minimum one individual measurement value (EM₁₁, EM'₁₁, EM₁₂, EM'₁₂, EM₁₃, EM'₁₃; EM₂₁, EM'₂₁, EM₂₂, EM'₂₂, EM₂₃, EM'₂₃; EM₃₁, EM'₃₁, EM₃₂, EM'₃₂, EM₃₃, EM'₃₃).
17. Procedure as per one of the above claims characterized by the fact that the adjustment follows in conjunction with the evaluation of the said measurement results (M₁₁. M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; M₃₁, M₃₂, M₃₃; M'₁₁, M'₁₂, M'₁₃; M'₂₁, M'₂₂, M'₂₃) either as confirmation of the existing control application point (R₀, R₁; R₂) or as shift with a pre-determined step size (ΔA).
18. Procedure as per claim 17 characterized by the fact that at least within one said sequence (S₁₁, S₁₂; S₂₁, S₂₂) the sequence of the test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃) corresponds to a specified setting sample.
19. Procedure as per one of the above claims characterized by the fact that the procedure (P₁, P₂, P₃, P'_1, P'₂) is controlled through a control device (10) of the textile machine (1).
20. Procedure as per one of the above claims characterized by the fact that the procedure (P₁, P₂, P₃, P'₁, P'₂) is manually initiated.
21. Procedure as per one of the above claims characterized by the fact that the procedure (P₁, P₂, P₃, P'₁, P'₂) gets initiated in the event of change of one or more operational parameters, especially in the event of change of features of the textile machine (1) and/or of the fibre mixture feed (FG_zu) and/or of the ambient conditions automatically, preferably through the controlling device (10).
22. Procedure as per one of the above claims characterized by the fact that the procedure (P₁, P₂, P₃, P'₁. P'₂) gets initiated in the event of change of feeding speed of the fibre mixture (FG_zu) fed to the drafting zone (VF) and/or change of discharge speed of the fibre mixture (FG_ab) from the drafting zone (VF) automatically, preferably through the controlling device (10).
23. Procedure as per one of the above claims characterized by the fact that the procedure (P₁, P₂, P₃, P'₁, P'₂) gets initiated in the event of quality change detected through a quality capturing device (11, 20) of the textile machine (1) arranged upstream of the drafting zone (VF) automatically, preferably through the control device (10).
24. Procedure as per one of the above claims characterized by the fact that the procedure (P₁, P₂, P₃, P'₁, P'₂) gets initiated in the event of quality change detected by a quality capturing device (12, 13) of the textile machine (1) arranged downstream of the drafting zone (VF) automatically, preferably through the control device (10).
25. Procedure as per one of the above claims characterized by the fact that the procedure (P₁, P₂, P₃, P'₁, P'₂) gets initiated preferably through the control device (10), regularly, for example after completion of a certain time span or after a certain length of the fibre mixture feed (FG_zu) or after a certain length of the carried off fibre mixture (FG_ab).
26. Procedure as per one of the above claims characterized by the fact that the procedure (P₁, P₂, P₃, P'₁, P'₂) gets automatically repeated after a said initiation so long until there is no further improvement of the quality of the fibre mixture (FG_ab) carried off from the drafting zone (VF).
27. Procedure as per one of the above claims characterized by the fact that jumps caused due to thick portions in the fibre mixture feed (FG_zu) in which minimum one quality defining parameter of the fibre mixture (FG_ab) carried off from the drafting zone (VF) is not referred to for the adjustment of the control application point (R₀, R₁, R₂, R₃).
28. Procedure as per one of the above claims characterized by the fact that on occurrence of a thick portion in the fibre mixture feed (FG_zu) an attached procedure (P₁, P₂, P₃, P'₁, P'₂) is interrupted or repeated.
29. Procedure as per one of the above claims characterized by the fact that in case of a thick portion in the fibre mixture feed (FG_zu) the initiation of a procedure (P₁, P₂, P₃, P'₁, P'₂) not yet attached is temporarily blocked.
30. Procedure as per one of the above claims characterized by the fact that the respective last used control application point (R₀. R₁. R₂, R₃) is saved manually, cyclic and/or event driven in a nonvolatile memory (22).
31. Textile machine (1), preferably short staple fibres processing textile machine (1), especially spinning machine, for example ring spinning or rotary spinning machine, or spinning preparation machine (1), for example carding unit (2) or drawing frame (3), or composite (1), covering for example one carding unit (2) and one drawing frame (3), with
    a drafting zone (VF), which has a controllable draft for levelling the length specific mass of a fibre mixture feed (FG_zu),
    a sensor device (11) for the generation of measurement values (MW), each of which correspond with the length specific mass of a section (AB_n-1, AB_n, AB_n+1) of the fibre mixture fed (FG_zu) to the drafting zone (VF),
    a control device (10) for controlling of the draft of the drafting zone (VF) on the basis of said measurement value (MW) of the sensor device (11), wherein the control device (10) is so built-up that a required control intervention in the draft of the drafting zone (VF) is carried out, as soon as the section (AB_n-1, AB_n, AB_n+1) corresponding with the measurement value (MW) reaches a location specified as control application point (R₀, R₁, R₂, R₃) and
    a quality capturing device (12, 13) arranged downstream of the drafting zone (VF) for the calculation of the measurement results (M₁₁, M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; M₃₁, M₃₂. M₃₃) minimum one quality defining parameter, for example of the CV% value or a parameter derived from it, of the fibre mixture (FG_ab) carried off from the drafting zone (VF)
    the control device (10) is built-up in a production phase of the textile machine (1) for automatic execution of a procedure (P₁, P₂, P₃, P'₁, P'₂) for dynamic adjustment of the control application point (R₀, R₁ R₂ R₃) at changing operational parameters, especially at the changing features of the textile machine (1) and/or of the fibre mixture feed (FG_zu) and/or changing ambient conditions, on the basis of measurement results (M₁₁, M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; M₃₁, M₃₂, M₃₃; M'₁₁, M'₁₂, M'₁₃; M'₂₁, M'₂₂, M'₂₃) obtained by the quality capturing device (12, 13) of the minimum one quality defining parameter,
    characterized by the fact that
    control device (10) is built-up for automatic specification of a majority of different test control application points (T11, T12, T13; T21, T22, T23; T31, T32, T33) and for the evaluation of measurement results (M11, M12, M13; M21, M22, M23; M31, M32, M33; M'11, M'12, M'13; M'21, M'22, M'23) obtained through the quality capturing device (12, 13) at the different test control application points (T11, T12, T13; T21, T22, T23; T31, T32, T33).
32. Textile machine (1) as per claim 31, characterized by the fact that the control device (10) is built-up for the specification of that kind of test control application points (T₁₁, T₁₂, T₁₃; T₂₁, T₂₂, T₂₃; T₃₁, T₃₂, T₃₃), at which a major deterioration of the quality of fibre mixture (FG_ab) carried off from the drafting zone (VF) during its usage is avoided.
33. Textile machine (1) as per claims 31 to 32, characterized by the fact that the control device (10) is built-up for the comparison of the amounts of measurement results (M₁₁, M₁₂, M₁₃; M₂₁, M₂₂, M₂₃; M₃₁, M₃₂, M₃₃; M'₁₁, M'₁₂, M'₁₃; M'₂₁, M'₂₂, M'₂₃) obtained through the quality capturing device.
34. Textile machine (1) as per claims 31 to 33, characterized by the fact that the control device (10) is built up for the adjustment of the control application point (R₀. R₁. R₂, R₃) through a shift with a pre-determined step size (ΔA).
35. Textile machine (1) as per claims 31 to 34 characterized by the fact that the control device (10) is built up for the automatic initiation of the procedure (P₁, P₂, P₃, P'₁, P'₂) in case of change at least of one operational parameter, especially in case of change of features of the textile machine (1) and/or of the fibre mixture feed (FG_zu) and/or of the ambient conditions.
36. Textile machine (1) as per claims 31 to 35 characterized by the fact that the control device (10) is built-up for automatic initiation of the procedure (P_1, P₂, P₃, P'₁, P'₂) in case of a change of entry speed of the fibre mixture feed (FG_zu) of the drafting zone (VF).
37. Textile machine (1) as per claims 31 to 36 characterized by the fact that the control device (10) is built-up for the automatic initiation of the procedure (P₁, P₂, P₃, P'₁, P'₂) in case of a quality change detected by a quality capturing device (11, 20) of the textile machine (1) arranged upstream of the drafting zone (VF).
38. Textile machine (1) as per claims 31 to 37 characterized by the fact that the control device (10) is built-up for the automatic initiation of the procedure (P₁, P₂, P₃, P'₁, P'₂) in case of quality change detected by the quality capturing device (12, 13) of the textile machine (1) arranged downstream of the drafting zone (VF).
39. Textile machine (1) as per claims 31 to 38 characterized by the fact that the control device (10) is built up for the regular, automatic initiation of the procedure (P₁, P₂, P₃, P'₁, P'₂), for example after expiry of a certain time span or after a certain length of the fibre mixture feed (FG_zu) or after a certain length of the fibre mixture (FG_ab) carried off.
40. Textile machine (1) as per claims 31 to 39 characterized by the fact that in nonvolatile memory (22) a provision is made for saving the last used control application point (R₀, R₁, R₂, R₃).

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