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EP0412448B1 - Système d'étirage avec commande maillée - Google Patents

Système d'étirage avec commande maillée Download PDF

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Publication number
EP0412448B1
EP0412448B1 EP90114936A EP90114936A EP0412448B1 EP 0412448 B1 EP0412448 B1 EP 0412448B1 EP 90114936 A EP90114936 A EP 90114936A EP 90114936 A EP90114936 A EP 90114936A EP 0412448 B1 EP0412448 B1 EP 0412448B1
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EP
European Patent Office
Prior art keywords
signal
measuring
inlet
procedure
accordance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90114936A
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German (de)
English (en)
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EP0412448A1 (fr
Inventor
Erich Jornot
Michael Leu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Rieter AG
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Maschinenfabrik Rieter AG
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Publication of EP0412448A1 publication Critical patent/EP0412448A1/fr
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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01H—SPINNING OR TWISTING
    • D01H5/00—Drafting machines or arrangements ; Threading of roving into drafting machine
    • D01H5/18—Drafting machines or arrangements without fallers or like pinned bars
    • D01H5/32—Regulating or varying draft
    • D01H5/38—Regulating or varying draft in response to irregularities in material ; Measuring irregularities
    • D01H5/42—Regulating or varying draft in response to irregularities in material ; Measuring irregularities employing electrical time-delay devices
    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G23/00—Feeding fibres to machines; Conveying fibres between machines
    • D01G23/06—Arrangements in which a machine or apparatus is regulated in response to changes in the volume or weight of fibres fed, e.g. piano motions

Definitions

  • the invention lies in the field of the textile industry and relates to a procedure for the control of a drafting system according to the generic terms of claims 1 and 7 respectively.
  • FIG. 1 shows a schematic representation of an embodiment the way.
  • Several slivers 15.1-15.6, six in the example, are grouped together in a loose fleece and passed through several roller systems 1-6. Because of the peripheral speed of the rollers in the direction of transport of the fiber material in increases two stages, this is advanced over the first stage (early default), further warped to the desired cross-section (Main default).
  • the fleece 18 emerging from the route is thinner than the fleece of the fed tapes 15.1-15.6 and correspondingly longer.
  • the fact that the warping depending on the cross section of the fed tapes can be regulated, the tapes or the fleece is evened out as it passes through the route, this means that the cross-section of the emerging fleece is more even than the cross section of the fed fleece or the tapes.
  • the present Route has a pre-default area 11 and a main default area 12 on.
  • the invention can also be used in context with routes with only one or more than two warpage areas in be used in an analogous manner.
  • the belts 15.1-15.6 are fed into the line by two systems 1 and 2 of conveyor rollers.
  • a first system 1 consists, for example, of two rollers 1.1 and 1.2, between which the fed belts 15.1-15.6, which are combined to form a looser fleece, are transported.
  • a roller system 2 follows, which here consists of an active conveyor roller 2.1 and two passive conveyor rollers 2.2, 2.3.
  • the fed tapes 15.1-15.6 are brought together to form a fleece 16.
  • the two roller systems 1 and 2 of the feed are followed in the transport direction of the fleece 16 by a third system 3 of pre-drafting rollers 3.1 and 3.2, between which the fleece is transported on.
  • the peripheral speed v 3 of the pre-drafting rollers is higher than that of the infeed rollers v 1,2 , so that the fleece 16 is stretched in the pre-drafting area 11 between the infeed rollers 2 and the pre-drafting rollers 3, its cross-section being reduced.
  • a pre-warped fleece 17 is created from the loose fleece 16 of the fed-in belts 17.
  • the pre-drafting rollers 3 are followed by a further system 4 of, for example, an active conveyor roller 4.1 and two passive conveyor rollers 4.2, 4.3 for further transport of the fleece.
  • the peripheral speed v 4 of the conveyor rollers 4 for further transport is the same as v 3 of the pre-drafting rollers 3.
  • the roller system for further transport 4 is followed by a fifth system 5 of main drafting rollers 5.1 and 5.2 in the transport direction of the fleece 17.
  • the main drafting rollers in turn have a higher surface speed v 5 than the preceding transport rollers 4, so that the pre-drawn fleece 17 between the transport rollers 4 and the main drafting rollers 5 is further drawn in the main drafting area 12 to the finished drawn fleece 18, the fleece 18 being closed via a funnel T. a volume is brought together.
  • the roller systems 1, 2 and 4 are driven by a first motor 7.1 via a gear or preferably via toothed belts.
  • the pre-drawing rollers 3 are mechanically coupled to the roller system 4, it being possible for the ratio with respect to the roller systems 1 and 2 to be adjustable or for a target value to be predetermined.
  • the gear (not visible in the figure) determines the ratio of the peripheral speeds of the inlet rollers (v in ) and the peripheral speed v 3 of the pre-drafting rollers 3.1, 3.2, hence the pre-drafting ratio.
  • the inlet rollers 1.1, 1.2 can also be driven by the first motor 7.1 or optionally by an independent motor 7.3.
  • the roller systems 5 and 6 are in turn powered by a second motor 7.2 driven.
  • the two motors 7.1 and 7.2 have according to the invention each with its own controller 8.1 or 8.2.
  • the regulation takes place via a closed control loop 8.a, 8.b or 8.c, 8.d. It can also the actual value of one motor the other motor in one or both Directions are transmitted over a control link 8.e so each can react accordingly to the other's setpoint deviations.
  • the total cross-section of the fed-in is at the entrance of the line Bands 15.1-15.6 measured by an inlet measuring element 9.1. At the exit the cross section of the emerging belt 18 is then from an outlet measuring element 9.2 measured.
  • a central computer unit 10 transmits an initial setting of the Target size for the first drive 7.1 via 10.a to the first controller 8.1.
  • the measured variables of the two measuring elements 9.1, 9.2 are during the Stretching process via the connections 9.a and 9.b continuously to the central Computer unit transmitted. From these measurement results and from the target value for the cross section of the emerging band 18 is in the central Computer unit and any other elements by means of the inventive
  • the setpoint for the second drive 7.2 is determined. This setpoint is continuously sent to the second controller 8.2 via 10.b. given. With the help of this control system, fluctuations in Cross-section of the fed tapes 15.1 - 15.6 through appropriate regulation the main default process compensated or a leveling of the tape can be achieved.
  • Position controllers (not Speed controller), as this also works if the Motor ensure the regulation.
  • the corresponding controllers 8.1, 8.2 can separate computing units (e.g. with digital computing elements; Microprocessors) or as a module of the central Computer unit 10 can be executed.
  • the measuring principle will be explained in more detail below.
  • the regulation of the strip cross-section or its equalization is thus essentially achieved by changing the warpage in the main warping area 12.
  • the inlet measuring element 9.1 supplies the input-side measurement signal with the information about the cross section of the fed strips 15.1-15.6.
  • Obtaining the desired run-in measurement signal is known to present measurement difficulties.
  • a cross-sectional measurement without impairing the material and with high dynamics is difficult to do in the conventional way.
  • an indirect measurement procedure must be carried out with a transducer.
  • Various conventional converters provide insufficient results for the desired purpose.
  • the difficulty lies in obtaining the desired signal directly via the measuring transducer via the volume present in the capacitor at a certain point in time, which represents the total cross section of the tapes fed in.
  • the voltage U across the capacitor is measured and the signal obtained is split into a real part R x and an imaginary part C x .
  • these signals R x and C x are evaluated as part of the regulation, the outflow measurement signal being used in the process.
  • the difficulties in the measurement on the input side are one reason why the control according to the invention is designed in such a way that measurement errors are compensated for in the context of an adaptive control.
  • the outlet measuring element 9.2 can be a conventional measuring instrument which delivers a signal A out with the information about the cross section of the emerging belt 18. This signal is also subsequently used for the control. It should be noted that the required measurements can not only be carried out directly at the inlet and outlet, but it is only necessary that one measuring element is arranged before and one after the controlled system (in the control-technical sense), ie here the main warpage area 12. With regard to a favorable time dependency of the regulation, it would also be advantageous, for example, to arrange the input-side measuring element directly in front of the main delay area 12.
  • a map is preferably determined empirically and continuously adapted during operation intended.
  • FIG. 3 illustrates the control principle and the method according to the invention in a schematic overview of the main control.
  • the distance is indicated by arrows which indicate the direction of travel of the belt, as well as by two blocks for the pre-draft 11 and the main draft 12.
  • the actual cross-section m E of the strips at the inlet is represented by the size m e
  • the actual cross-section m A of the finished warped strip by the size m a
  • the belts are fed in at the speed v in at the inlet and the finished belt exits at the speed v out .
  • the size of the early draft K1 can be adjusted by means of a specification element 19.
  • the controlled system (in the technical control sense) is formed here by the main delay area 12.
  • the running time between the inlet measuring element 9.1 and the main drafting area 12 is identified by t1, that between the main drafting area and the outlet measuring element 9.2 by T2.
  • the measured variables A out , R x and C x of the measuring elements 9.1, 9.2 represent input variables of a control system.
  • This contains a central computer unit 10 which contains the measured variables C x , R x , the temperature I T and any further information I 1-n , such as humidity.
  • the size A target is specified as the reference variable.
  • a first path 1 contains the central one Computer unit 10 with inlets and outlets as well as several timing elements Z1.1-Z3 and, according to the invention, is used to prepare the measurement data.
  • On second path 2 is used to optimize the delay time t1.
  • a third Path 3 is used to optimize the keeping of the band average and compensation for long-term disturbances.
  • a fourth path 4 is provided, which optimizes short-term compensation Provides for disturbances. It is anticipated that preferably a digital control is used in the context of the invention. In order to it becomes possible to have all elements of the control system in one computer to realize. To illustrate the rule principle, the essential elements necessary for the explanation of the invention in FIG 3 schematically broken down.
  • a comparator 35 is provided the formation of a difference between the outlet signal A out and the target value A is performs.
  • the deviation dA determined in this way is fed via an I-link 38 to an addition point 36.
  • the signal ⁇ m is formed by integrating the mean value deviations in an I element 38 and adding 1.
  • this deviation and the deviations ⁇ h caused by short-term disturbances are added and finally the factor 1 + ⁇ m + ⁇ h multiplied in a multiplication point 39 by the predetermined nominal value K3 of the main delay.
  • the variant with a multiplication point 39 was preferred, since the manipulated variable y is to be used here in the context of a division element (x / y) for controlling the main delay.
  • the corresponding multiplication results in the manipulated variable y required for controlling the main delay.
  • the outflow measurement signal A out is further fed to a high-pass element 47 of path 2.
  • the filtered signal is squared at a multiplication point 40 and the signal ⁇ H is obtained therefrom, which indicates the high-frequency component of the mean value fluctuations.
  • the high-frequency components which in this exemplary embodiment are up to approximately 300 Hz, are taken into account for this path.
  • the signal ⁇ H is fed to a first control element R1 with a transfer function to minimize ⁇ H.
  • the output of the control element R1 forms the signal S t1 , which optimizes the delay time of various time elements Z1.1, Z1.2, Z4 or is fed directly to the central computer unit (10).
  • an additional correction element (not shown here) is provided in path 2 for determining the delay time t1.
  • a map element 50 is provided as the connecting core of paths 1 and 4. This can be designed, for example, as a readable and readable memory and in turn can be integrated into the central computer unit 10.
  • the measured value pairs R x , C x are supplied to the map element 50 and this supplies the quantity m e as the output signal.
  • the map is continuously adjusted during operation. This adaptation takes place in path 1.
  • the signals R x , C x are fed into the central computer unit 10 with a delay in corresponding timing elements Z1.1-Z2.2.
  • the timing elements Z1.1-Z2.2 serve to take into account the total running time t1 + T2 from the inlet to the outlet measuring element.
  • the filtered variable m e / t1 delayed taking into account the running time t1 and adjusted for delay in a division element 43, is fed to a further input of the central computer unit via a timing element Z3.
  • the signal A out with the information about the outlet band cross section m A represented by the measured quantity m a , also forms an input of the computer unit 10.
  • the quantity m a is preferably also filtered before it is fed to the central computer unit 10, wherein in a corresponding filter 46 of path 1, the low-frequency signal components are cut.
  • the transit time t1 can also be taken into account directly by the central computer unit by supplying the output signal S t1 of path 2 to it.
  • All signals supplied to the computer unit are used in the following for cleaning the map of the map element 50 is used by the output of the computer unit 10 in the map element 50, the (effective) size m e determined by evaluating the measurement data being transmitted to the respective pair of values C x , R x .
  • This is a permanent adaptation of the map guaranteed changes within the control process. It can be seen that the central computer unit 10 must at least evaluate the signals m e , R x , C x and m a in order to ensure the map adaptation.
  • the mentioned additional measurement data I T , I 1-n can, however, bring about a further improvement in the control under certain conditions.
  • path 4 provides for filtering the signal A out , but this time with a bandpass element 48 instead of a highpass element.
  • a multiplication point 41 and a control element R2 for minimizing the corresponding signal ⁇ B are connected downstream of the ban element 48.
  • the control element R2 provides at its output a factor f B , which is linked in a multiplication point 42 with the signal m e / t1 .
  • This signal m e / t1 is present at the output of a filter 49, to which the signal m e from the map element 50 is fed via a timing element Z4.
  • This filter 49 cuts the low-frequency signal components.
  • Path 4 further contains a threshold switch 25 with an adjustable default value ⁇ .
  • the switch is in a first position p1. As soon as the specified value ⁇ is exceeded, ie large fluctuations of m e around the mean value occur, the switch switches to a position p2 in which the signal m e / t1 is looped directly to path 3, so that these fluctuations are fully taken into account for the main delay . However, if the values for m e / t1 are below this default value ⁇ , path 4 is optimized.
  • the signal m e / t1 is multiplied in the multiplication point 42 by the factor f B determined by means of the minimization function of the control element R2 and the output signal of the multiplication point is fed to the path 3 via the switch 25.
  • the switchover by means of the threshold switch 25 and the consideration of the optimization by the control element R2 prevents that, in the case of small and very small, short-term mean value deviations, any interference, for example caused by noise, is introduced into the path 3.
  • the threshold switch serves to switch the optimization on or off by means of the control elements R1, R2. If m e lies above the preset value ⁇ , the optimization of the control elements R1, R2 is switched off, otherwise switched on. It is not absolutely necessary to switch off the respective optimization brought about by the control elements R1, R2 when the preset value ⁇ is exceeded, since the corresponding regulation can also run away by means of compensation elements. In the context of digital regulation, however, the corresponding regulations can be switched on and off as simply as possible, so this variant is preferred.
  • the threshold switch can also be implemented by a non-linear element or in the map be integrated. In the latter case, in addition to the output variable m e , the map element 50 also supplies the signal required for activating or deactivating the optimization of the control elements R1, R2 or an amplitude-dependent parameter.
  • the high pass member of the path 2 for example frequencies above 100 Hz, the bandpass those in the range of 10-100 Filter Hz.
  • the frequency ranges depend on the throughput speed of the tapes in the area above around 600 m / min. was accepted.
  • the transfer functions of the control elements R1, R2 can vary depending on the design of the control system.
  • the filters of the paths 2 and 4 are omitted and the transfer functions are determined instead that the frequencies in question are required be taken into account.
  • the filter 46 of the Path 1 is omitted and the filtering can be done as part of the central Computer unit 10 can be realized. Because of the possibility of change the parameters of the corresponding transfer functions also exist the advantage of being able to adapt to different operating conditions (e.g. variable throughput speed of the belts) can be.
  • a special embodiment sees an adaptive adaptation in this sense the control parameters.
  • the parameters of the transfer functions the control elements R1, R2 are changed in the course of the control, so that the variation of the manipulated variable is minimized.
  • the parameters of the transfer functions are in such an embodiment by the Central computer unit 10 determined from the measurement parameters. With the adaptive Regulation must attach great importance to stability.
  • the central computer unit 10 is preferably a digital one Computing element realized. It is obvious that the explanation of the principle of the method, the functions of the various functions explicitly shown Paths 1-4 in Figure 3 partially or entirely in a uniform Computer can be integrated.
  • the output map for me can be determined, for example, by static measurements on the measuring capacitor 21 and then stored in tabular form. It should be noted that in the case of modified measuring methods, other characteristic maps must be determined. The principle according to the invention can therefore also be carried out with corresponding characteristic maps for other inlet and outlet measurement signals.
  • the control principle according to the invention ensures very good evenness even in the event of unforeseen changes in operating conditions. In particular, there are also measurement errors in the frame on the inlet side the regulation compensated. Both short-term disruptions as well slow changes can be optimally compensated within the scope of this regulation become. If the described procedure for the main regulation of the Drafting system in connection with the auxiliary regulation of the independent Drive groups combined and a correspondingly meshed control provided, there are particularly favorable conditions. By the control variable y determined is therefore the setpoint for the controller 8.2 of the drive used for the main warping area 12.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Claims (15)

  1. Procédé pour la régulation d'un banc d'étirage comportant un organe de mesure à l'entrée du banc d'étirage et un organe de mesure à la sortie du banc d'étirage qui fournissent des signaux de mesure pour un circuit régulateur fermé et un circuit régulateur ouvert, le signal de mesure (Aout) à la sortie étant utilisé pour l'adaptation des paramètres de régulation d'au moins un élément régulateur (50, R1, R2), caractérisé en ce que le signal de mesure (Aout) du côté sortie est utilisé pour l'adaptation d'un champ caractéristique (R) pour le signal de mesure (Cx, Rx) de l'organe de mesure (9.1) du côté entrée.
  2. Procédé selon la revendication 1, caractérisé par les pas de procédé suivants :
    a. le signal de mesure (Rx, Cx) de l'entrée est transmis à un champ caractéristique (R) et à une unité centrale d'ordinateur (10) comme grandeur d'entrée ;
    b. le signal de mesure (Aout) de la sortie est transmis à l'unité central d'ordinateur (10) ;
    c. au moyen du champ caractéristique (R), le signal de mesure (Rx, Cx) de l'entrée est transformé en un signal (me) représentant la section du ruban entrant qui indique les irrégularités passagères des rubans entrants ;
    d. ce signal (me) est corrigé en ce qui concerne l'étirage et transmis à l'unité centrale d'ordinateur ;
    e. à la base de ce signal (me), du signal de mesure (Aout) de la sortie ainsi que du signal de mesure (Rx, Cx) de l'entrée, l'unité centrale d'ordinateur (10) détermine la dépendance effective de la section (me) du ruban entrant du signal de mesure (Rx, Cx) de l'entrée et le champ caractéristique (R) est adapté.
  3. Procédé selon la revendication 2, caractérisé en ce que des grandeurs d'entrée (IT, I1-n) supplémentaires sont transmises à l'unité centrale d'ordinateur (10) qui sont utilisées pour l'adaptation du champ caractéristique.
  4. Procédé pour la régulation d'un train d'étirage selon l'une des revendications 1 à 3, caractérisé en ce que le signal de mesure (Aout) de la sortie est utilisé pour la régulation de variations passagères de la valeur moyenne du ruban comme suit :
    a. le signal de mesure (Aout) de la sortie est transmis à un premier élément régulateur (R1) dont la fonction de transmission provoque une minimalisation des parts à haute fréquence de ce signal (Aout), pour la détermination du temps mort (t1) ;
    b. le signal de mesure (Aout) de la sortie est transmis à un deuxième élément régulateur (R2) dont la fonction de transmission provoque une minimalisation des parts à fréquence moyenne de ce signal (Aout), pour la détermination du facteur amplificateur (fB)
  5. Procédé selon la revendication 4, caractérisé en ce qu'un filtre passe-haut pour la plage de 100 à 300 Hz est utilisé dans le but de réaliser les parts à haute fréquence pour le premier élément régulateur (R1).
  6. Procédé selon la revendication 4 ou 5, caractérisé en ce qu'un filtre passe-bande pour la plage de 10 à 100 Hz est utilisé dans le but de réaliser des parts à fréquence moyenne pour le deuxième élément régulateur (R2).
  7. Procédé pour la régulation d'un banc d'étirage comportant un organe de mesure à l'entrée du train d'étirage et un organe de mesure à la sortie du train d'étirage qui fournissent des signaux de mesure pour un circuit régulateur fermé et un circuit régulateur ouvert, caractérisé en ce que
    a. un signal (me) représentant la section du ruban entrant est retransmis, au moyen d'un commutateur de seuil (25), en fonction d'une valeur (δ) allouée, soit directement vers l'organe de réglage, si cette valeur (δ) allouée a été dépassée, ou bien il est multiplié, à un point de liaison (42), avec un facteur amplificateur (fB) de réglage pour retransmettre ensuite le signal en résultant vers l'organe de réglage, si la valeur (δ) allouée n'a pas été atteinte ;
    b. l'optimisation de l'amplification de la régulation ainsi que le temps de retard sont déclenchés dès que le signal (me) représentant la section du ruban entrant dépasse la valeur (δ) allouée et en ce que ceux-ci sont enclenchés dès que ce signal (me) passe en dessous de cette valeur (δ) allouée ;
    c. le signal de sortie (Δh) déterminé selon 〈〈 a. 〉〉, représentant des variations passagères et qui a été optimisé et un signal (Δm) représentant les variations lentes de la section (mA) du ruban sortant sont additionnés et influence la variable réglante (HV(1 + Δm + Δh)).
  8. Procédé selon les revendications 4 et 7, caractérisé en ce que l'optimisation est déclenchée par les deux éléments régulateurs (R1, R2) dès que le signal (me) représentant la section du ruban entrant dépasse la valeur (δ) allouée et en ce que l'optimisation est enclenchée dès que ce signal (me) passe en dessous de cette valeur (δ) allouée.
  9. Procédé selon la revendication 1 ou 7, caractérisé en ce que l'organe de mesure (9.1) situé à l'entrée est conçu comme condensateur de précision (21) à l'aide duquel le changement du diélectrique causé par le passage des rubans alimentés (15.1-15.6) est mesuré en mesurant la tension U au-dessus du condensateur.
  10. Procédé selon la revendication 9, caractérisé en ce que le changement de tension mesuré est décomposé en une partie réelle (Rx) et une partie imaginaire (Cx) du signal qui sont transmises au champ caractéristique (R) et à l'unité central d'ordinateur.
  11. Procédé selon l'une des revendications 1 à 10, caractérisé en ce que le signal de mesure (Rx, Cx) de l'entrée ainsi que le signal (me/t1) représentant la section du ruban entrant (mE) et qui a été corrigé en ce qui concerne l'étirage sont transmis à l'unité centrale (10) d'ordinateur avec un retard (t1, t2) correspondant à la durée de marche entre l'organe de mesure (9.1) du côté entrée et l'organe de mesure (9.2) du côté sortie.
  12. Procédé selon l'une des revendications 1 à 11, caractérisé en ce que la durée de marche (t1) entre l'organe de mesure (9.1) du côté entrée et le champ d'étirage principal (12) et/ou la durée de marche (T2) entre le champ d'étirage principal (12) et l'organe de mesure (9.2) du côté sortie est prise en compte par l'unité centrale (10) d'ordinateur.
  13. Procédé selon l'une des revendications 1 à 12, caractérisé en ce que la variable réglante (HV(1 + Δm + Δh)) du réglage principal influence la valeur de consigne d'au moins un groupe de commande à réglage auxiliaire d'un champ d'étirage (12) avec un étirage nominal (K3) prédéterminé.
  14. Procédé selon l'une des revendications 1 à 13, caractérisé en ce qu'au moyen du procédé un banc d'étirage est régulé selon l'une des revendications 1 à 5.
  15. Procédé selon l'une des revendications 1 à 13, caractérisé en ce qu'au moyen du procédé un train d'étirage intégré dans une peigneuse est régulé.
EP90114936A 1989-08-11 1990-08-03 Système d'étirage avec commande maillée Expired - Lifetime EP0412448B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH2955/89 1989-08-11
CH295589 1989-08-11
CH295589 1989-08-11

Publications (2)

Publication Number Publication Date
EP0412448A1 EP0412448A1 (fr) 1991-02-13
EP0412448B1 true EP0412448B1 (fr) 2000-10-11

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EP90114936A Expired - Lifetime EP0412448B1 (fr) 1989-08-11 1990-08-03 Système d'étirage avec commande maillée

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US (1) US5134755A (fr)
EP (1) EP0412448B1 (fr)
JP (1) JP3037376B2 (fr)
DE (1) DE59010914D1 (fr)

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL90789A0 (en) * 1988-08-05 1990-01-18 Rieter Ag Maschf Textile machine with drawframes
US5509179A (en) * 1990-06-25 1996-04-23 Mondini; Giancarlo Autoleveller draw frame having process feed back control system
US5377385A (en) * 1990-09-20 1995-01-03 Maschinenfabrik Reiter Ag Draw frame, storage device and coiler, delivery regulation
EP0477589B1 (fr) * 1990-09-26 1996-04-24 Maschinenfabrik Rieter Ag Procédé pour la correction d'un signal de mesure déterminé pour la masse d'un ruban de carde d'un régulateur d'étirage pour des rubans de carde avec un organe de mesure de sortie
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JP3037376B2 (ja) 2000-04-24
US5134755A (en) 1992-08-04
DE59010914D1 (de) 2000-11-16
EP0412448A1 (fr) 1991-02-13
JPH03180524A (ja) 1991-08-06

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