EP0976674B1 - Dispositif de réglage de la tension d'une bande - Google Patents

Dispositif de réglage de la tension d'une bande Download PDF

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Publication number
EP0976674B1
EP0976674B1 EP99810654A EP99810654A EP0976674B1 EP 0976674 B1 EP0976674 B1 EP 0976674B1 EP 99810654 A EP99810654 A EP 99810654A EP 99810654 A EP99810654 A EP 99810654A EP 0976674 B1 EP0976674 B1 EP 0976674B1
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EP
European Patent Office
Prior art keywords
web
tension
web tension
soll
reference value
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
EP99810654A
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German (de)
English (en)
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EP0976674A1 (fr
EP0976674B2 (fr
Inventor
Walter Siegl
Olivier Stehlin
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.)
Wifag Maschinenfabrik AG
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Wifag Maschinenfabrik AG
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Application filed by Wifag Maschinenfabrik AG filed Critical Wifag Maschinenfabrik AG
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Publication of EP0976674B1 publication Critical patent/EP0976674B1/fr
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H23/00—Registering, tensioning, smoothing or guiding webs
    • B65H23/04—Registering, tensioning, smoothing or guiding webs longitudinally
    • B65H23/18—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web
    • B65H23/188—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web
    • B65H23/1888—Registering, tensioning, smoothing or guiding webs longitudinally by controlling or regulating the web-advancing mechanism, e.g. mechanism acting on the running web in connection with running-web and controlling web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2513/00—Dynamic entities; Timing aspects
    • B65H2513/10—Speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2515/00—Physical entities not provided for in groups B65H2511/00 or B65H2513/00
    • B65H2515/30—Forces; Stresses
    • B65H2515/31—Tensile forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2557/00—Means for control not provided for in groups B65H2551/00 - B65H2555/00
    • B65H2557/10—Means for control not provided for in groups B65H2551/00 - B65H2555/00 for signal transmission
    • B65H2557/12—Network

Definitions

  • the present invention relates to a web tension control device and is suitable in particular for shaft-driven rotary offset printing presses in tower construction, preferably for the newspaper offset.
  • DE 43 44 896 C2 of the applicant discloses an embodiment of a shaftless driven web-fed rotary printing machine with at least one color-transferring Cylinder pair with a blanket cylinder and a plate cylinder, the common Drive are mechanically coupled together by a first motor and a counter-pressure cylinder with the blanket cylinder a pressure nip for forming the web and being driven by another motor, at least one the ink cylinder associated with the plate cylinder and at least one controller for the Engines, whereby the first engine over a transmission the blanket cylinder and the another engine via another gear drives the impression cylinder.
  • the precise adjustment and regulation of the paper web tension in web offset printing presses during the printing process is of great importance.
  • the correctly set Web tension is not only required for achieving good print quality e.g. Not only color and cut register are better adhered to, but also leads to an increase in print productivity, since fewer or no paper tears caused become. It is therefore common for web tension certain web tension profiles along the individual paper paths, i. that predetermined upper or Lower limit values of the web tension should not be exceeded or fallen below.
  • the paper elastic modulus can become strong from paper roll to paper roll change, which can lead to a sudden change in the web tension. This occurs e.g. when changing roles and has a very negative impact on the quality of the Printed product.
  • the elastic modulus of the paper may also be within the same roll of paper, because, for example, due to storage, the outer and inner layers of the paper roll are different moist. This Changes in the elastic modulus of the paper result due to the resulting Web tension changes and paper stretch to changes in color and Cut register during the roll handling and thus to a deterioration in quality. Also varying color and humidity assignments change the modulus of elasticity.
  • transient processes e.g. ramped speed changes of the paper web, or even moving a Rubber cylinder between a pressure on and a pressure-off position.
  • This Transient processes occur e.g. in shaftless web offset presses with a so-called "flying" disk switching functionality often, with no stopping the printing presses successively made different production runs.
  • the web tension is strongly influenced and changed.
  • Fig. 4a shows a known web tension control device.
  • a target web tension value F SOLL is predetermined by a machine control and a web tension controller determines from a difference between the target web tension value F SOLL and a web tension actual value F IST measured by a web tension measuring sensor a lag target value ⁇ N DESIR.
  • the determined speed reference N SOLL can not be used directly for the web tension control, but must first low-pass filtered to suppress higher-frequency interference components of the speed reference setpoint signal N SOLL .
  • the low-pass filtered speed command value N SOLL is applied with the lag value ⁇ N SOLL from the web tension controller and the actual speed value N IST of the roller driven by the drive motor, and the obtained signal is supplied to the speed controller, which drives the drive motor.
  • the lag control is a simple and fast speed control.
  • a value .DELTA.N is supplied, which is determined from a difference of a Drehiereleitsollwerts N setpoint eg a bus system and a measured actual value N actual speed, and a lag setpoint .DELTA.N SET .
  • This speed controller controls the drive motor in a known manner.
  • the lag control is structurally very easy to implement, and avoids the disadvantages of the web tension control, due to the low-pass filtering, but the lag control also has disadvantages.
  • the resulting web tension is dependent on the speed of the paper web. This means that without post-corrections of the speed reference setpoints N SOLL the web tension can not be kept constant, eg during a speed ramp. This leads, as mentioned above, to a deterioration in the quality of the printed products.
  • a strong fluctuation of the paper web tension z. B. at a normal stop or an emergency stop the printing press extremely negative, since in the pure speed control, the web tension can grow extremely strong, which can easily lead to a demolition of the paper web.
  • the web tension also varies greatly in a pressure on or a print-off process of all pressure points, for example, a four-high tower, which is also not desirable.
  • Fig. 4c shows such lag control with droop functionality.
  • a speed controller is in turn fed to a differential .DELTA.N which value speed is N, and a further correction variable N M, which is determined from a measured engine load torque, and a Nacheilungssollwert .DELTA.N SOLL is formed by a rotational-speed N SOLL, a.
  • the control with droop functionality has the advantage that disturbances caused by changes in the paper elastic modulus or by pressure on or pressure off processes cause only minor deviations of the web tension.
  • disturbances due to a change in the modulus of elasticity of paper cause a permanent deviation of the web tension if the value ⁇ N SOLL is not corrected.
  • a desired web tension value can not be maintained after a disturbance without a corresponding adaptation of the value ⁇ N SOLL , since the current elastic modulus of the paper web is generally unknown.
  • Fig. 5 shows a linearized diagram in which the abscissa, the rotational speed N of the intake train is plotted at a certain engine speed, wherein the paper web tension F is plotted on the ordinate.
  • the straight lines E 1 and E 2 are shown, wherein the modulus of elasticity of a paper web can vary between these two straight lines shown by way of example.
  • the qualitative characteristic of the simple web tension control device is marked with 1, the characteristic of the lag control with 2 and the characteristic of the lag control with droop functionality is marked with 3.
  • a lag control results in a difference ⁇ F 2 of the web tension, which is considerably greater than the web tension difference which occurs in the case of lag control with droop functionality, such as represented by ⁇ F 3 in Fig. 5. This illustrates the advantage of this scheme.
  • a control circuit for a motor which for control the tension of a paper web between two pairs of rollers are used can, wherein a measured web tension and a predetermined web tension a Control are supplied, which outputs a signal to a speed control, which further includes a speed reference signal and a feedback speed signal receives.
  • This speed control gives a signal to a Current control for controlling a drive motor of a role of the pair of rollers.
  • a tension control device a paper web of a shaftless driven printing press to propose, which the disadvantages of the known Avoid regulations.
  • both the Drehiereleitsollwert N SOLL and the web tension setpoint F SOLL by eg a machine control can be freely selected.
  • a speed reference setpoint N SOLL can be specified in real time, which does not have to be filtered and is available in its original form as a control variable.
  • the control device can thus adjust the paper web tension immediately after the occurrence of a disturbance variable directly and without inertia.
  • the web tension setpoint F SOLL can be selected freely and thus specified in terms of optimizing the print quality, so that the two important for the control setpoint variables F SOLL and N SET of the controller can be freely specified.
  • a web tension control circuit allows changes in printing conditions due to, for example, a change in the paper elastic modulus or a print-on / print-off operation of blanket cylinders on the paper web to be quickly taken into account in the control, at a constant speed To ensure web tension during operation, while the speed can be adjusted quickly.
  • the simultaneous specification of the generated web tension setpoint value F SOLL and the generated rotational speed target setpoint value N SOLL also enables a better control of the control device, since two setpoint values for the control can be freely selected and, for example, can be quickly changed by the machine control system without causing any occurrences of the normal printing process must be considered, which always leads due to run times to a sluggishness of the whole scheme.
  • the speed controller of the control device is supplied to the difference between the rotational-speed N SOLL and the lag setpoint .DELTA.N SOLL, which was determined by the web tension controller from the web tension set value F SOLL and IS the web-tension actual value F to the motor to control so that a desired, preferably constant, web tension at a given speed can be obtained.
  • the web tension control device thus enables by use an undisturbed speed reference setpoint signal for the subordinate speed control loop a better match between web tension control loop and speed control loop.
  • disturbances of the web tension e.g. time optimized in front of the infeed plant be managed.
  • This leads to very good dynamic properties of the invention Control which in the above-mentioned changes in the operating conditions for Maintaining a constant web tension is required.
  • the regulation according to the invention limits web tension changes in the printing tower itself become. Namely, the magnitudes of these changes can be estimated these being independent of paper type, moisture and other disturbances about stay the same.
  • the web tension control according to the invention has the further advantage that the web tension always in one for the used Paper can be kept appropriate area, so that paper tears are avoided can.
  • the control device according to the invention either individually z. On the Feed-in mechanism or on the pull-out mechanism. Furthermore, it is also possible that the Control according to the invention both for controlling the web tension at the infeed than also used to control the pull-out.
  • Such a regulation of input and output Draft works of the printing tower has the advantage that the web tension over the entire Rail length can be controlled through the pressure tower through, so that a particularly favorable web tension, preferably a constant web tension, from Feed-in system via the printing tower to the extension works results.
  • the invention relates to the web tension regulators in each case at the infeed station or the extraction plant or both, which are to be regulated arranged.
  • the Control according to the invention can also be used individually or together with other control devices be arranged at other locations of the paper web, such as e.g. in the printing tower itself or the funnel inlet roller.
  • the speed reference setpoint N SOLL is transmitted via a fast bus.
  • this is a real-time bus system, such as a SERCOS bus.
  • This control of the control device or control devices by such a bus system greatly simplifies the control of the control system on a printing tower, since all desired values can thus be predetermined by a remote machine control of the control system. Thus, the local input of desired values can be dispensed with.
  • different printing towers are controlled via a single bus, which in turn can specify different, but coordinated setpoints for the respective printing towers. The individual printing towers can thus be operated individually with different web tension or with different types of web paths.
  • Corresponding embodiments apply analogously to the regulation of the web tension on Extractor, which also the paper web tension in dependence of the Can control web tension actual size of a single web tension sensor, which does not necessarily have to be arranged on the extension unit itself. It may be for the scheme the web tension at the extraction plant also any combination of two or more Web tension actual value signals of individual web tension sensors are used to to regulate the paper web tension.
  • the actual web tension values recorded by the one or more web tension sensors are first fed to a transmission element or different transmission elements with a suitable transmission function before they are used as input variables of the web tension control.
  • the individual transmission elements can be used, for example, to weight the proportions of each actual value signal for a total actual trajectory voltage.
  • each individual measured by a web tension sensor actual signal can be supplied only to a transmission element with a suitable dynamic transfer function, such as a PT 1 or PT 2 member before it is the web tension control is supplied with other possibly also weighted or dynamically altered Web tension actual variables is linked.
  • Such consideration of multiple weighted and dynamically evaluated web tension actuals may account for changes within the printing tower due to, for example, the moisture of the paper and changes along the usually long paper paths between, for example, the pullout and the hopper infeed roller for controlling the total web tension.
  • predefined web tension values along the entire paper web path can be maintained within certain limits, whereby predetermined limit values are not exceeded or undershot.
  • Each of these web tension controls can, for example, an actual value F IST , which is detected by any Bruliquesmeßsensor, after passing through a corresponding transfer function block as input used, of course, a weighted sum of several signals for a single web tension control can be used.
  • the web tension control at the infeed station is given a value F EW , which is preferably determined from a cross-coupling of the measured web tension values F IST at the infeed station, at the outfeed station and at the hopper infeed roller.
  • F EW the web tension control at the extension work.
  • a matrix element ⁇ i does not necessarily have to be a constant, but can also represent a dynamic transfer function.
  • cross-coupled web tension control is to ensure the optimum web tension throughout the entire printing process over the entire paper web and to minimize cut register deviations therebetween, so that the individual elements ⁇ i of the coupling matrix must be suitably determined.
  • cross-coupling of at least two input signals of two different web tension sensors can also be used for only a single web tension control, but also for three or more web tension controls, optionally also the cylinder inside the printing tower.
  • the number of measured input variables of the cross coupling, ie the measured web tension actual values is not limited to three. It is also possible to use only two or more than three input signal actual values, with the measuring sensors then being suitably arranged in each case.
  • a speed reference setpoint N SOLL and a web tension setpoint value F SOLL are specified.
  • a first web tension actual value F IST is measured.
  • a pre- or lag setpoint .DELTA.N SET is determined by a web tension controller, a pre- or lag setpoint .DELTA.N SET , depending on whether it is the extract or intake.
  • the difference .DELTA.F formed can serve, for example, a PI control algorithm to obtain a post- or overfeed value.
  • the forward or lag setpoint .DELTA.N SOLL is added to the rotational-speed N SOLL or subtracted therefrom, and the obtained result is the speed used as an input variable of a control of a drive motor, which is provided as a further input variable and a measured actual rotational speed value N can take into account.
  • At least one measured actual web tension value F IST is used, for example, at the infeed station, the extension unit or the hopper inlet roller, whereby, of course, any combination of these web tension actual values, optionally with prior loading with a suitable transfer function as described above, is used for web tension control can be.
  • the individual web tension actual value can also be cross-coupled, as described above, before they are used as an input variable for the control method.
  • the speed reference setpoint N SOLL and the web tension setpoint value F SOLL are fed to the web tension control device by a machine controller via a real-time bus system.
  • the web tension setpoint can also be supplied via analog or digital inputs without the use of a bus system.
  • the actual web tension value F IST measured by a web tension measuring sensor is subtracted from the web tension setpoint value F SOLL , from which the web tension control deviation ⁇ F is obtained.
  • This web tension control deviation .DELTA.F is fed to the web tension controller at the infeed station, which converts this into a lag setpoint .DELTA.N SET .
  • This lag setpoint .DELTA.N SOLL is the measured actual rotational speed value N associated with the obtained from the real-time bus system speed master N SOLL and and the result is fed to the speed controller, wherein the motor for driving a roller of the draw-in mechanism, drives.
  • the Drehiereleitsollwert N SOLL for the subordinate speed control loop is the controller thus from a suitable real-time bus, eg SERCOS supplied, so that an undisturbed reference signal as Drehiereleitsollwert available, so that the web tension controller and the speed controller can be optimally matched.
  • Fig. 2 shows a second embodiment of the present invention, wherein as input parameters of the web tension control at the intake EW not only the measurement signal of the web tension sensor at the intake EW, but also measured signals from web tension sensors on the funnel inlet roller TW and the extension work AW recorded and each with coefficients ⁇ TW , ⁇ AW or ⁇ EW are applied. These coefficients ⁇ i can be constants, but these can also represent dynamic transfer functions. From the output signals of these three signal weighting units or dynamic transmission elements ⁇ i , a weighted sum signal ⁇ F is formed, which is used as the input value for the web tension control of the intake train.
  • a web tension control can be done only at the feed train, which can be maintained within predetermined limits by the arrangement shown in Fig. 2 arrangement of Bruliquesmeßsensoren and with a suitable choice of the weighting factors or transfer functions ⁇ i and the web tension at the extension work or funnel inlet roller, so that despite certain disturbances caused by varying modulus of elasticity of the paper web, moisture, speed ramps or the like, the web tension can be kept in an optimum for the color and cut register area and tearing of the paper web can be reliably prevented.
  • the other elements of the control device have been described in FIG. 1 and are not shown in FIG. 2.
  • Fig. 3 shows a third embodiment of the present invention, wherein the actual web tension values of the infeed and extracting in a coupling member are linked or calculated, so that the web tension control at the infeed or extracting the respective output signals of the coupling element F EW or F AW be supplied.
  • the coupling element can carry out a weighting of the measured web tension actual values of the intake train and of the extension train, wherein the individual signals can also be acted on by dynamic transfer functions so as to obtain the respective output signals, which respectively represent a dynamic function of one or all input signals of the coupling element.
  • the web tension can be regulated locally at the entrance and at the exit of the printing tower, whereby in each case the corresponding web tension actual values are taken into account in order to obtain web tension values within predefined limits over the entire course of the paper web, so that the color and cut register can be kept optimal due to the held within certain barriers web stretches.
  • the web tension is independent of the rotational speed, so that it can be kept within certain predetermined limits.
  • the force in front of the tower increases in the acceleration phase of the control according to the invention according to FIG. 1. This force difference serves to accelerate the guide rollers.
  • the paper web hangs between two nips, the last impression cylinder and the draw roller.
  • This web force is from the lead of the draw roller and the paper transport, leading to a dependent speed function of the web tension at the outlet of the printing tower F AFTER.
  • this can be prevented with an embodiment of the inventive arrangements according to the embodiments shown in Fig. 2 and Fig. 3.

Landscapes

  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Control Of Multiple Motors (AREA)

Claims (7)

  1. Machine d'impression, entraínée sans arbre, comprenant un outil d'entrée et un outil de sortie ayant respectivement un moteur d'entraínement,
       caractérisée par :
    un dispositif de régulation destiné à commander le moteur respectif pour la tension d'une bande de papier d'une machine d'impression comprenant :
    un dispositif de réglage d'une valeur de consigne de vitesse de rotation (Nsoll) ; et
    un régulateur de vitesse de rotation d'un moteur d'entraínement, qui est couplé au dispositif de réglage de la valeur (Nsoll) de consigne de la vitesse de rotation
    un dispositif de réglage de la valeur (Fsoll) de consigne de la tension de la bande;
    un capteur de mesure de la tension (Fist) de la bande ;
    un régulateur de la tension de la bande, qui est couplé au capteur de mesure de la tension (Fist) de la bande et au dispositif de réglage de la valeur (Fsoll) de consigne de la tension de la bande ;
    le régulateur de vitesse de rotation étant couplé à une sortie (ΔNsoll) de régulateur de la tension de la bande.
  2. Dispositif de régulation, suivant la revendication 1, dans lequel le dispositif de réglage de la valeur (Fsoll) de consigne de la tension de la bande et/ou de la valeur(Nsoll) de consigne de la vitesse de rotation est un système bus, notamment un système buse à temps réel.
  3. Dispositif de régulation suivant l'une des revendications précédentes, dans lequel il est prévu un élément de transfert ayant une fonction de transfert linéaire ou dynamique, par laquelle le signal de sortie du capteur est influencé.
  4. Dispositif de régulation suivant l'une des revendications précédentes, dans lequel il est prévu au moins deux capteurs de mesure de la tension (Fist) de la bande en des emplacements différents de la bande de papier, les signaux de sortie des capteurs étant couplés entre eux et subissant l'influence de fonctions de transfert avant d'être envoyés à une régulation locale de la tension de la bande.
  5. Procédé de régulation de la tension d'une bande de papier d'une machine à imprimer, entraínée sans arbre, comprenant un outil d'entrée et un outil de sortie ayant respectivement un moteur d'entraínement, chaque moteur étant commandé par le fait que :
    il est prescrit une valeur (Nsoll) de consigne de vitesse de rotation,
    il est prescrit une valeur (Fsoll) de consigne de tension de la bande,
    on mesure une première valeur (Fist) réelle de la tension de la bande,
    on forme la différence (ΔF) entre la valeur (Fsoll) de consigne de la tension de la bande et la tension (Fist) réelle de la tension de la bande, qui a été mesurée.
    on transforme la différence (ΔF) formée en une valeur (ΔNsoll) de consigne de retard ou d'avance,
    à partir de la valeur (Nsoll) de consigne de la vitesse de rotation, qui est prescrite, et de la valeur (ΔNsoll) de consigne de retard ou d'avance, on forme une grandeur (ΔN) qui sert à la régulation de la vitesse de rotation du moteur d'entraínement.
  6. Procédé suivant la revendication 5, dans lequel la ou les valeurs (Fist) de la tension de la bande qui est ou sont mesurées sont influencées respectivement par une fonction de transfert.
  7. Procédé suivant l'une des revendications 5 ou 6 dans lequel on couple de manière croisée au moins deux valeurs (Fist) de tension de la bande, qui ont été mesurées, pour fournir un signal de valeur réel de la tension de la bande pour la régulation de la tension de la bande.
EP99810654A 1998-07-31 1999-07-20 Dispositif de réglage de la tension d'une bande Expired - Lifetime EP0976674B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19834725 1998-07-31
DE19834725A DE19834725A1 (de) 1998-07-31 1998-07-31 Bahnspannungsregeleinrichtung

Publications (3)

Publication Number Publication Date
EP0976674A1 EP0976674A1 (fr) 2000-02-02
EP0976674B1 true EP0976674B1 (fr) 2004-03-24
EP0976674B2 EP0976674B2 (fr) 2006-08-30

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ID=7876100

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99810654A Expired - Lifetime EP0976674B2 (fr) 1998-07-31 1999-07-20 Dispositif de réglage de la tension d'une bande

Country Status (4)

Country Link
US (1) US6106177A (fr)
EP (1) EP0976674B2 (fr)
AT (1) ATE262468T1 (fr)
DE (2) DE19834725A1 (fr)

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ATE262468T1 (de) 2004-04-15
DE19834725A1 (de) 2000-02-03
EP0976674B2 (fr) 2006-08-30
DE59908933D1 (de) 2004-04-29
US6106177A (en) 2000-08-22

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