EP2524806B1 - Procédé de réglage de la tension de bande dans une machine de traitement de bande - Google Patents

Procédé de réglage de la tension de bande dans une machine de traitement de bande Download PDF

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Publication number
EP2524806B1
EP2524806B1 EP12152807.9A EP12152807A EP2524806B1 EP 2524806 B1 EP2524806 B1 EP 2524806B1 EP 12152807 A EP12152807 A EP 12152807A EP 2524806 B1 EP2524806 B1 EP 2524806B1
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EP
European Patent Office
Prior art keywords
web
web tension
control
tension
change
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.)
Not-in-force
Application number
EP12152807.9A
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German (de)
English (en)
Other versions
EP2524806B2 (fr
EP2524806A1 (fr
Inventor
Holger Schnabel
Stephan Schultze
Mario Goeb
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/02—Arrangements of indicating devices, e.g. counters
    • 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
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/90—Register control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2401/00—Materials used for the handling apparatus or parts thereof; Properties thereof
    • B65H2401/20—Physical properties, e.g. lubricity
    • B65H2401/23—Strength of materials, e.g. Young's modulus or tensile strength

Definitions

  • the present invention relates to a method of controlling web tension in a web processing machine.
  • web-processing machine e.g. Newspaper printing machines, commercial printing machines, gravure printing machines, packaging printing machines, digital printing machines or securities printing machines, as well as other web-processing machines, e.g. Pouch machines, envelope machines or packaging machines, can be used.
  • the web can be made of paper, cloth, cardboard, plastic, metal, rubber, in foil form, etc.
  • a web is moved along driven axes (web transport axes or devices) such as draw rolls or feed rolls and non-driven axes (such as deflection, guide, drying or cooling rolls).
  • driven axes web transport axes or devices
  • non-driven axes such as deflection, guide, drying or cooling rolls.
  • the web is at the same time by means of usually also powered processing facilities, (such as printing units, cutters) edited (eg printed, punched, cut, folded, etc.).
  • a longitudinal and / or side register (longitudinal register - in the web running direction, side register - transversely to the web running direction) regulated.
  • This serves to regulate the positions of the processing of the individual processing devices (for example the layers of individual, differently colored printed images) relative to one another and takes place, for example, by means of a so-called angular adjustment of the processing device to be corrected.
  • the web tension is often also regulated (for example by speed adjustment of a transport device) in order to achieve an optimum printing result.
  • controller parameters that must be set.
  • Typical controller parameters are the proportional gain Kp, the integral gain K I , the differential gain K D , the reset time T N , the derivative time T V , delays T, etc.
  • a controller parameter as a function of at least one parameter characterizing the web, such as the modulus of elasticity and / or the cross-section, at least one parameter characterizing the processing machine, such as the web speed and / or the section length, and at least one, in particular constant (ie non-web speed-dependent) and / or speed-dependent dead time, such as a transmission time and / or a measurement time , described.
  • the parameterization is carried out regularly, so that, for example, the change in the modulus of elasticity can be automatically reacted by adapting the controller parameters. As a result, the best possible controller parameters should be specified at all times.
  • the WO 02/07975 A1 discloses a method for controlling a web tension, in which an elongation of the web during operation is monitored and wherein a detected change in elongation is counteracted by a change in tension.
  • the present invention proposes a method for operating a web-processing machine having the features of claim 1.
  • Advantageous embodiments are the subject of the dependent claims and the following description.
  • the invention now comprises the measure of an upcoming change of at least one parameter influencing the web tension (this is a parameter characterizing the web, in particular the modulus of elasticity E), which in the uncontrolled case would lead to a sudden change in the web tension namely, the strain due to unchanged machine speed constant), the effects of the web tension control to reduce the web elongation, in particular to reduce the control loop dynamics of the web tension controller.
  • the change in the parameter influencing the web tension leads to a greater change in the web tension in comparison with a conventional web tension control, but thereby to a smaller change in the web elongation.
  • the invention uses to implement a reduction of the influence or the dynamics of the web tension control, by suitable modification of the controller parameters (eg reduction of K P ), activation of limits in the controller (especially for the controller output variable and / or the control difference, ie the input variable ) or by adjusting the setpoint.
  • the web tension setpoint can be changed so that a strain change remains low.
  • the new desired value can be determined, for example, by determining the web tension resulting after the change without regulation (for example, by using the changing material parameter and calculating therefrom the resulting web tension for a constant web elongation).
  • the web tension resulting after the change can also be measured with the web tension control switched off and used as the new web tension setpoint. Subsequently, the web tension control would be switched on again with the new setpoint. Starting from the new web tension setpoint, the current setpoint is reset to the original value with sufficiently low dynamics.
  • the reduced dynamics of the web tension controller result in a change in the actual web tension (which can be kept essentially constant if the web tension control has a greater influence, for example in the case of strong or dynamic controller settings).
  • the invention is based on the recognition that the longitudinal register is influenced less by a web tension than by a web elongation. By reducing the web tension control dynamics, the strain change due to a change in the controller output will also be less dynamic.
  • a less strong engagement of a web tension controller will cause the duration of the compensation process is extended, but in conjunction with a register controller whose closed loop control dynamics is greater than or equal to the dynamics of the web tension controller, the maximum amount of register deviation decreases.
  • the effect of the web tension control on the web stretch is reduced so that the amount of register deviation occurring does not exceed an upper threshold, so that preferably just no waste occurs.
  • the invention provides a possibility, with knowledge of a pending change of at least one parameter influencing the web tension, to take measures beforehand in order to minimize paper waste.
  • the time of a change is known, for example, in the case of a flying roll change, a change in the color or moisture input into the material web or a change in the temperature in the machine in advance.
  • the conversion of the web tension control can therefore preferably take place automatically within the control device.
  • the change in the color or moisture input into the material web occurs in printing processes such as offset printing, gravure printing, flexographic printing, etc. by "pressure on” / “pressure off” settings or by changes in the amount of ink or water supplied during printing.
  • the amount of ink in one format may be due to another printed image.
  • Digital printing machines are characterized e.g. by being able to directly print different products from format to format without stopping the machine. That By color changes, a sudden change in web material properties is also obtained here.
  • the change in the temperature in the machine can be done relatively suddenly, if, for example, dryers can be changed very dynamically in their heating power or if the drying process of the ink or the web can be changed relatively quickly (eg turning on an LED dryer).
  • the invention leads to a targeted reduction in the dynamics of the web tension control.
  • high dynamics are found under normal operating conditions or e.g. during machine start-up as advantageous to achieve a short settling time of the web tension controller and there to produce less waste.
  • the dynamics of the web tension controller after the change of at least one parameter affecting the web tension is increased again or reset to the normal state. This can be time-dependent or falls below a register deviation threshold.
  • the switching is expediently not abruptly, but continuously or in small steps.
  • the controller parameters are linearly interpolated between reduced and high dynamics to achieve a smooth transition.
  • a smoothing of the actual web tension value is undertaken. Smoothing can be realized, for example, with a PT1 element by correspondingly increasing the time constant T 1 . Greater smoothing leads to an additional delay (dead time) in the system and reduces the possible control loop dynamics. Depending on the reduction of the control loop dynamics, the smoothing time constant T 1 can be automatically adapted, in this case increased. Assuming that the dynamics of the closed loop is inversely proportional to an actual value smoothing, smoothing elements can be introduced or already existing smoothing time constants can be increased with a small predetermined control loop dynamics, without the control loop becoming unstable as a result. As a result, in particular broadband noise interference can be counteracted on a web tension actual value. Unwanted fluctuations in the controller output can be reduced as a result.
  • the control loop dynamics of the web tension controller adapts to the control loop dynamics of the register controller.
  • the bandwidth of the closed web tension control loop can be set to a fixed factor (eg 1/10) of the bandwidth of the closed loop register by appropriately adapting (reducing) the controller parameters of the web tension controller. This results in an independent of the control loop dynamics of the register control loop comparable transient behavior in the longitudinal register.
  • By reducing the controller parameters of the web tension controller dominates the control loop dynamics of the register controller. This means that the web tension controller slowly regulates the erratic change in the modulus of elasticity and thus the web tension back to the desired value, whereby due to the higher dynamics of the register controller, this adjusts the strain changes generated thereby, without waste being generated.
  • An arithmetic unit according to the invention e.g. a control unit of a printing press, is, in particular programmatically, adapted to perform a method according to the invention.
  • Suitable data carriers for providing the computer program are, in particular, floppy disks, hard disks, flash memories, EEPROMs, CD-ROMs, DVDs and the like. It is also possible to download a program via computer networks (Internet, intranet, etc.).
  • FIG. 1 a schematic section of a printing machine 10 is shown, in which a material web 101 is transported and processed by five here as printing units 1 to 5 formed clamping points. Between each two adjacent clamping points, a web tension section is formed.
  • a web tension section 12 is limited by the printing units 1 and 2, a web tension section 23 through the printing units 2 and 3, a web tension section 34 through the printing units 3 and 4 and a web tension section 45 through the printing units 4 and 5.
  • printing units can also transport works, such as Feeding or extracting plant, be affected.
  • the printing machine further has here as load cells 121 to 124 formed web tension sensors for determining the tensile force F in the respective web tension sections.
  • the physical parameters, namely the length 1, the elongation ⁇ and the tensile force F of the individual web tension sections are also indicated in the figure. Assuming a usually constant web cross section, the tensile force F is proportional to the web tension ⁇ .
  • the tensile force and thus the web tension over the peripheral speeds v1 to v5 of the printing units 1 to 5 is set, which can be changed by a designed as a computer unit or computer 150 web tension control device.
  • a designed as a computer unit or computer 150 web tension control device For influencing the web tension, for example in the web tension section 34, two strategies are known. In the upstream strategy, the printing unit 3 (and optionally upstream printing units) is adjusted, and in the downstream strategy, the printing unit 4 (and optionally subsequent printing units) is adjusted. Increasing the speed of the forward nip causes a stationary reduction in web tension and increasing the speed of the rear nip causes a steady increase in web tension in that web tension section.
  • the traction force values detected by the sensors 121 to 124 are fed to a device for web tension control (so-called web tension or tension controller) within the arithmetic unit 150.
  • the tension controller then controls the speeds v1 to v5 as a function of the control deviation (deviation between setpoint and actual value), for example by influencing a gearbox factor (so-called fine adjustment) between machine speed (which is usually specified by a virtual master axis) and transport roller.
  • FIG. 2 the web tension control on which the invention is based is schematically illustrated by means of a control loop 200.
  • the control loop may, for example, a printing machine according to FIG. 1 underlie.
  • the command variable w eg., The target pulling force F soll
  • a comparator or subtracter 201 which includes the controlled variable y (eg., The tensile force F, which is proportional as mentioned for the web tension) is applied.
  • the resulting control difference or deviation e is fed to a web tension control element 202, which is present is formed as a PI element with a proportional gain K P and a reset time T N.
  • the control element can also be embodied as a P, PD or PID element or as another regulator, such as a state controller.
  • the control member 202 may be supplied by a switching element 203 different controller parameters.
  • the switching element 203 can for this purpose supply to the control element 202 a first set 210 or a second set 211 of controller parameters which determine the influence of the web tension control.
  • the first set of controller parameters may result in dynamic web tension control for normal operation, whereas the second set results in less dynamic web tension control for impending jump changes in web tension (eg, due to a change in modulus of elasticity).
  • the control element 202 calculates, based on the controller parameters supplied to it, a controller output variable u R which is supplied to the controlled system (G) 204. Behind the controlled system affects a disturbance d (in the example shown also additively via an adder 205), which changes the controlled variable or the actual value y . This is measured, for example, with the aforementioned sensors and returned to the comparator 201 again.
  • the controller output u R can be a fine adjustment fa , which influences the rotational speed of the device to be controlled.
  • step 301 the processing machine is in a defined state ("normal operation"), in which the web tension control device with a first parameter set, for example. The set 210, is applied.
  • step 302 the method waits for a pending change 311 of at least one parameter influencing the web tension, usually the modulus of elasticity E.
  • a pending change 311 of at least one parameter influencing the web tension usually the modulus of elasticity E.
  • step 303 the system takes a change in controller dynamics, in the example of FIG. 1
  • the parameters can, for example, be taken from a lookup table or database.
  • a corresponding automatic calculation of the parameter sets can also be carried out.
  • the newly selected parameters are maintained until a suitable condition is met and the previous parameters 210 are reentered in step 304.
  • the condition may be the elapse of a time period or the decrease in register deviation or web tension deviation below a predetermined threshold. Thereafter, the system returns to wait state 302 and waits for another change.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)

Claims (11)

  1. Procédé de régulation de la tension de bande d'une bande de produits (101) dans une machine de traitement de bande (1), dans lequel une valeur effective (y) de la tension de bande est régulée au moyen d'un élément de régulation (202) d'un circuit fermé de régulation de tension de bande (200) à une valeur nominale (w) de la tension de bande, dans lequel un écart de réglage (e) est fourni à l'élément de régulation (202), dans lequel une grandeur de sortie de régulation (uR ) est délivrée par l'élément de régulation (202), caractérisé en ce que, avant une prochaine modification d'au moins un paramètre influençant la tension de bande, les effets de la régulation de la tension de bande sur un allongement de bande (ε) sont réduits, dans lequel l'au moins un paramètre influençant la tension de bande est un paramètre caractérisant la bande de produits (101), dans lequel les effets de la régulation de la tension de bande sur l'allongement de bande (ε) sont réduits par une modification de paramètres de régulation (210, 211) de l'élément de régulation (202), une limitation de la grandeur de sortie de régulation (uR ) et/ou de l'écart de régulation (e), une modification de la valeur nominale (w) de la tension de bande et/ou une modification de la largeur de bande du circuit fermé de régulation de tension de bande (200).
  2. Procédé selon la revendication 1, dans lequel les effets de la régulation de tension de bande sur l'allongement de bande (ε) ne sont réduits que lorsque les prochaines modifications de l'au moins un paramètre influençant la tension de bande dépassent une valeur de seuil prédéterminée.
  3. Procédé selon la revendication 1 ou 2, dans lequel le paramètre caractérisant la bande de produits (101) est le module d'élasticité.
  4. Procédé selon l'une quelconque des revendications précédentes, dans lequel, en tant que nouvelle valeur nominale (w) de la tension de bande, on utilise une valeur instantanée de la tension de bande se produisant après la modification sans régulation.
  5. Procédé selon l'une quelconque des revendications précédentes, dans lequel les effets de la régulation de la tension de bande sur l'allongement de bande (ε) sont de nouveau augmentés lorsqu'une condition prédéterminée est satisfaite.
  6. Procédé selon la revendication 5, dans lequel la condition prédéterminée est l'expiration d'un intervalle de temps prédéterminé.
  7. Procédé selon l'une quelconque des revendications précédentes, dans lequel il se produit au moins un lissage modifié ou appliqué de manière supplémentaire de la valeur instantanée (y) lors de la régulation avec des effets réduits de la régulation de la tension de bande sur l'allongement de bande.
  8. Procédé selon l'une quelconque des revendications précédentes, dans lequel, avant la prochaine modification de l'au moins un paramètre influençant la tension de bande, la dynamique de circuit de régulation concernant le circuit de régulation de tension de bande (200) est réglée à une valeur inférieure à la dynamique de circuit de régulation concernant un circuit de régulation de repérage existant.
  9. Procédé selon l'une quelconque des revendications précédentes, dans lequel les effets de la régulation de la tension de bande sur l'allongement de bande (ε) sont réduits de manière à ce qu'un écart de repérage se produisant du fait de la modification de l'au moins un paramètre influençant la tension de bande reste inférieur à une valeur de seuil prédéterminée.
  10. Unité de calcul conçue pour mettre en oeuvre un procédé selon l'une quelconque des revendications précédentes.
  11. Machine de traitement de bande, notamment machine d'impression, comportant une unité de calcul selon la revendication 10.
EP12152807.9A 2011-05-17 2012-01-27 Procédé de réglage de la tension de bande dans une machine de traitement de bande Not-in-force EP2524806B2 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102011101842A DE102011101842A1 (de) 2011-05-17 2011-05-17 Verfahren zum Regeln der Bahnspannung in einer Bahnbearbeitungsmaschine

Publications (3)

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EP2524806A1 EP2524806A1 (fr) 2012-11-21
EP2524806B1 true EP2524806B1 (fr) 2015-11-18
EP2524806B2 EP2524806B2 (fr) 2018-10-03

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US (1) US20120294662A1 (fr)
EP (1) EP2524806B2 (fr)
BR (1) BR102012011695A2 (fr)
DE (1) DE102011101842A1 (fr)

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US10343943B2 (en) 2014-04-24 2019-07-09 Corning Incorporated Glass manufacturing apparatus and methods
US20150328879A1 (en) * 2014-05-19 2015-11-19 Matthias Hermann Regelsberger Precision registration in printing cylinder systems
EP3686138B1 (fr) * 2017-09-19 2024-03-27 Sumitomo Heavy Industries, Ltd. Système de traitement de bande et procédé de commande
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DE19723043A1 (de) 1997-06-02 1998-12-03 Wifag Maschf Registerhaltige Abstimmung von Druckzylindern einer Rollenrotationsmaschine
DE10135773A1 (de) 2001-07-23 2003-02-13 Koenig & Bauer Ag Verfahren und Vorrichtung zum Regeln einer Druckmaschine

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EP2524806A1 (fr) 2012-11-21

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