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EP1739042B1 - Procédé de fonctionnement d'une machine de traitement de bandes - Google Patents

Procédé de fonctionnement d'une machine de traitement de bandes Download PDF

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Publication number
EP1739042B1
EP1739042B1 EP20060006639 EP06006639A EP1739042B1 EP 1739042 B1 EP1739042 B1 EP 1739042B1 EP 20060006639 EP20060006639 EP 20060006639 EP 06006639 A EP06006639 A EP 06006639A EP 1739042 B1 EP1739042 B1 EP 1739042B1
Authority
EP
European Patent Office
Prior art keywords
drives
web
speeds
modulation
modulated
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.)
Active
Application number
EP20060006639
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German (de)
English (en)
Other versions
EP1739042A1 (fr
Inventor
Thomas Vetter
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.)
Aradex AG
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Aradex AG
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Filing date
Publication date
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Publication of EP1739042A1 publication Critical patent/EP1739042A1/fr
Application granted granted Critical
Publication of EP1739042B1 publication Critical patent/EP1739042B1/fr
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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
    • B41F13/004—Electric or hydraulic features of drives
    • B41F13/0045—Electric driving devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H20/00—Advancing webs
    • B65H20/005—Electrical drive motor control devices therefor
    • 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
    • B65H23/044—Sensing web tension
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2200/00—Printing processes
    • B41P2200/10—Relief printing
    • B41P2200/12—Flexographic printing

Definitions

  • the invention relates to a method for operating a web-processing machine according to the preamble of claim 1.
  • Such web-processing machines generally have an arrangement of process elements with associated drives, wherein the process elements are used for the transport and / or processing of a web.
  • Examples of such web-processing machines are in particular printing presses or other machines for the production or processing of webs formed from paper, cardboard or even plastics or textiles.
  • Such process variables in web-processing machines can be detected, for example, by the use of additional sensors. With such sensors, so-called Bahnwoodsmessem the forces acting in a web can be determined. However, in order to precisely track the forces acting in the web, one must at different measuring locations Variety of such sensors are installed, which means a considerable installation and cost. In addition, it is often not possible for reasons of space or process-technical reasons to attach such sensors to web-processing machines.
  • a measurement of the torques of the drives can also be carried out to determine the stresses within the material web, for which purpose the motor currents in the individual drives can be measured.
  • a first source of error is that the necessary conversion of the determined motor current of a drive to the desired torque due to interference such as temperature effects, in principle, is faulty. Furthermore, this measured variable also includes friction moments or friction forces in the process elements. Thus, the measurement of the motor current as a parameter for the torque of a drive provides no reliable, reproducible statement about the process size of the web.
  • a device in which paper is conveyed by means of rollers driven by a first motor.
  • a control unit which controls a second motor which drives a spool from which the paper is conveyed.
  • the invention has for its object to provide a method of the type mentioned, by means of which with little design effort a reproducible control of the transport and / or processing of a web in a web-processing machine is made possible.
  • the invention relates to a method for operating a web-processing machine which has an arrangement of drive-driven process elements for the transport and / or processing of a web.
  • the speeds of at least a part of the drives are each with modulated a predetermined modulation frequency.
  • changes in the influencing variables of the drives due to the modulations are recorded.
  • the basic idea of the invention is that, by the modulation of the speeds of the drives and the measurement of the respective influencing variable following the modulation frequency, it is possible to systematically eliminate external interferences in the measurement such as noise. It is essential here that the measurement of the respective process variable takes place exactly in the frequency and phase position of the modulation carried out.
  • process variables or web-processing machines can be detected accurately and reproducibly with the method according to the invention, whereby a reliable control of the operation of the web-processing machine is made possible.
  • the speed modulation of the drives is performed such that the functions of the process elements remain unaffected, that is, the accuracy of the transport and / or the processing of the web remains within predetermined limits.
  • the amplitudes and the modulation frequency of the modulation frequency carried out are to be selected in a suitable manner.
  • the amplitude of the modulation is to be chosen sufficiently small compared to the absolute amount of the speed to be modulated.
  • the modulation frequency is to be chosen so that the influencing variable to be measured can also follow the change in the speed due to the modulation, so that a measurable change in the influencing variable is produced.
  • the accuracy of the measuring method according to the invention can thereby be further increased by repeating the speed modulations at predetermined time intervals and by integrating the results obtained for the influencing variable in the individual modulations.
  • the influencing variables detected in the method according to the invention are formed by characteristics of the drives, in particular the torques of the drives. In addition, if necessary, the positions and / or speeds of the drives can be detected.
  • a significant advantage of the method according to the invention is that these influencing variables can be detected without additional sensors.
  • already existing units can be used in the drives or in converters that are used to control the drives.
  • the converters already have units for measuring the motor currents of the drives, which form a measure of the torques of the drives to be determined.
  • inventive method can also be used for systems with additional sensors, in which case the signals form the measured influencing variables.
  • information about different process variables can be obtained. This includes, on the one hand, information about the speed-dependent friction within the system, in particular the process elements driven by the drives. Furthermore, information about the material webs to be transported or processed can be obtained as further process variables. These include forces acting on the webs or reactions of the webs on such forces, in particular tensions in webs, deformations of webs and the resulting information about the elasticity of webs.
  • the speeds of all drives of the web-processing machine are preferably modulated with a modulation frequency, wherein the torques of all drives are detected as influencing variables. In doing so, in particular Received information about the speed-dependent friction within the web-processing machine.
  • speed modulations are not performed on all but on individual drives or individual groups of drives.
  • the torques of all drives are preferably detected again as influencing variables.
  • the positions and / or speeds of drives may be detected, preferably detecting the positions and / or speeds of drives whose speed has not been modulated.
  • deviations of these parameters from predetermined desired values can be detected, which are caused by the modulations.
  • the elastic moduli of such webs can be determined by the measurements of the influencing variables.
  • both variants of the velocity modulations for determining process variables are combined, that is, applied together.
  • all drives of the web-processing machine are alternately speed-modulated once and speed-modulated once only individual drives or individual groups of drives of the web-processing machines.
  • all drives are simultaneously speed modulated with a first modulation frequency and speed modulated individual drives or groups of drives with a second modulation frequency. Since the first and second modulation frequencies differ, the measurement results for the modulations with the first and second modulation frequencies can be separated and evaluated separately.
  • the measurement results for the modulations with the first and second modulation frequencies are advantageously related to one another, wherein this is preferably done by means of a differential measurement.
  • the speed-dependent friction can be calculated from the measured values for determining local stresses or strains in the material web or for determining the modulus of elasticity of the material web, so that these measured quantities can be determined accurately and without errors.
  • the inventive method can be used in different web-processing machines. These include in particular printing presses, machines for the production of paper, cardboard, plastic films and composite materials as well as slitter winder as further paper-processing machines. Furthermore, the method according to the invention can be used in machines that process webs that are not made of paper. These include textile machines, in particular machines for the production or processing, in particular finishing of textile webs, in particular knitwear. Furthermore, the web-processing machine may be formed as a film stretching machine. Finally, the web-processing machine can be designed as a straightening device for straightening sheets. Here sheets are unwound from a coil and moved by means of several successively arranged driven straightening rollers back and forth to remove the originating from the winding bend in the sheet.
  • FIG. 1 shows, as the first exemplary embodiment of a web-processing machine, a printing press 1, 1 'in single-stand construction.
  • This printing machine 1, 1 ' is used for printing or generally for processing a web formed as a paper web 2.
  • three processing units 3a, 3b, 3c are provided in the present case, which are arranged one behind the other in the conveying direction F of the paper web 2.
  • Each processing unit 3a, 3b, 3c has as a process element a plurality of driven cylinders, namely an impression cylinder 4, a format cylinder 5 and an anilox roller 6.
  • With the processing units 3 a, 3 b, 3 c in particular print motifs with different colors can be printed on the paper web 2.
  • the paper web 2 is withdrawn from an unwinder 7 via a first pulling unit 8 and fed to the processing units 3a, 3b, 3c. After processing the paper web 2 in the processing plants 3 a, 3 b, 3 c, this is fed via a further tensioning unit 8 to a rewinder 9 and wound there.
  • the traction units 8 each consist of two driven counter-rotating transport cylinders 10.
  • FIG. 2 schematically shows an arrangement of drives 11 by means of which the process elements of a web-processing machine, in particular of the printing press 1 according to FIG. 1, are driven.
  • the drives 11 are designed as three-phase motors, for example synchronous motors, and are each driven by a converter 12.
  • the rewinder 9 and the unwinder 7 are operated by asynchronous motors.
  • the inverters 12 lead as power-side connections lines 13 to the associated drives 11.
  • FIG. 2 shows only one such line in each case. Since the converters 12 and drives 11 are each designed in three phases, however, three such lines 13 generally lead from one converter 12 to the associated drive 11.
  • a signal line 14 leads to the assigned drive 11, via which control commands from the converter 12 the drive 11 can be dispensed.
  • the inverters 12 are connected via further signal lines 15 to a central controller 16, which controls the operation of the web-processing machine.
  • the drives 11 are modulated alternately with two different modulations.
  • the first modulation the velocities of all drives of the web-processing machine are modulated at a predetermined modulation frequency.
  • the torques of the drives 11 are determined by measuring the motor currents in the inverters 12. The measurements of these influencing variables take place in the frequency and phase position of the modulation frequency. This phase-sensitive evaluation eliminates interference such as noise during the measurements.
  • speed-dependent friction is detected in the web-processing machine, while speed-independent friction effects are eliminated by the measurements based on the velocity modulation.
  • the speed-dependent friction effects are based, for example, on the elastic deformations of clichés not shown for printing the paper web 2.
  • the speed-dependent friction effects are particularly advantageously eliminated by subtraction of the measured values in the first and second modulation, so that the modulus of elasticity of the web can be determined, for example, by evaluating the measurement results for the torques for the machining units 3a, 3b, 3c in the second modulation.
  • An increase in the speed of the drives 11 of the processing unit 3b for example, increase the web tension between the processing units 3b and 3c and reduce between the processing units 3a, 3b, which is registered with the measurement of the torques. From these measurement results can be concluded from the percentage factor between strain and tension of the paper web 2, so their modulus of elasticity.
  • the first and second modulations are performed alternately. Alternatively, these can also be carried out simultaneously, in which case, however, the modulation frequencies must be different for the first and second modulations in order to be able to separate the respectively obtained measurement results. In principle, only a first or second modulation can be performed.
  • the amplitudes and frequencies of the modulations are chosen so that they do not affect the processing process of the web.
  • the method described can be extended or changed so that the tension rollers 10, 10 'are speed-modulated together or against each other.
  • the coatings of the draw rolls 10, 10 'or their coefficients of friction can thus be controlled.
  • FIG. 3 shows, as a second exemplary embodiment of a web-processing machine, a printing machine 1, 1 'in central cylinder construction.
  • This printing press 1 also has an unwinder 7, from which a paper web 2 is unwound.
  • the paper web 2 is fed to a central processing station, which has a central counter-pressure cylinder 4 'and a plurality of inking units 17 distributed in the circumferential direction of the counter-pressure cylinder 4'.
  • Each inking unit 17 comprises a format cylinder 5 'and an anilox roller 6'.
  • the paper web 2 to be printed is guided between the counter-pressure cylinder 4 'and the respective format cylinder 5' running on this lateral surface.
  • the color necessary for the printing process is transferred from an anilox roller 6 'to a printing plate 18 on the respective format cylinder 12'.
  • the printed paper web 2 is finally fed to a rewinder 9 analogously to the exemplary embodiment according to FIG.
  • the first modulation in turn, the velocities of all drives 11 are modulated and, in response to this, the torques of all drives 11 are determined again.
  • the drives 11 an inking unit 17 are modulated.
  • the measured values for the individual drives 11 are analogous to the exemplary embodiment according to FIG. 1. While information about the speed-dependent frictional forces within the entire web-processing machine results from the measurement results for the first modulation, information is obtained from the measurement results for the second modulations obtained via the elastic deformation of the printing plate 18 of the inking unit 17.
  • Figure 4 relates to another embodiment of a web-processing machine in the form of a winder, in which a paper web 2 is first cut in the conveying direction F and then wound up.
  • Figure 4 shows a section of a slitter. This section shows two support rollers 19, 20, on which the already rolled up part of the paper web 2 rests as a roller 21. By the rotational movements of the driven support rollers 19,20, the roller 21 is wound further.
  • the support roller 19 located at the front in the conveying direction F of the paper web 2 runs at a slightly higher surface speed than the carrier roller 20. As a result, a bias is exerted on the paper web 2 to be wound on the roller 21, so that the roller 21 attains a high strength.
  • the speed of the rear support roller 20 is modulated with a modulation frequency, which in turn enables a determination of the modulus of elasticity of the paper web 2.
  • a modulation frequency With a known modulus of elasticity wear effects in the surface of the paper web 2 can be detected.
  • all drives 11 are particularly speed-modulated in order to determine therefrom the speed-dependent friction effects and then to calculate them out in the determination of the modulus of elasticity.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (20)

  1. Procédé de fonctionnement d'une machine de traitement de bandes avec un agencement d'éléments de processus entraînés par des entraînements (11) afin de transporter et/ou de traiter une bande d'articles, les vitesses d'au moins une partie des entraînements (11) pouvant être chacune modulées grâce à une fréquence de modulation prédéterminée, caractérisé en ce des modifications des grandeurs d'influence des entraînements (11) provoquées par les modulations sont saisies afin de détecter des paramètres ou grandeurs de processus de la machine de traitement de bandes.
  2. Procédé selon la revendication 1, caractérisé en ce que le couple d'au moins un entraînement (11) est mesuré en tant que grandeur d'influence.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé en ce que la position et/ou le nombre de tours ou régime d'au moins un entraînement (11) sont mesurés en tant que grandeurs d'influence.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que la mesure d'une grandeur d'influence a lieu dans la fréquence et la position de phase de la modulation de la vitesse de chaque entraînement (11).
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que les amplitudes et les fréquences de modulation des modulations de vitesse sont choisies de manière à être assez importantes pour que les processus de traitement et/ou de transport réalisés avec les éléments de processus ne soient pas entravés ou altérés.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que les modulations de vitesses dans des intervalles de temps donnés sont répétés et en ce que les résultats obtenus pour les différentes modulations isolées sont intégrés pour les grandeurs d'influence.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que les vitesses de tous les entraînements (11) de la machine de traitement de bandes sont modulées.
  8. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que la vitesse d'un seul entraînement (11) ou les vitesses d'un groupe d'entraînements (11) sont modulées.
  9. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que de façon alternée les vitesses de tous les entraînements (11) de la machine de traitement de bandes et de façon échelonnée dans le temps la vitesse d'un entraînement (11) ou les vitesse d'un groupe d'entraînements (11) sont modulées.
  10. Procédé selon l'une des revendications 1 à 6, caractérisé en ce que simultanément les vitesses de tous les entraînements (11) de la machine de traitement de bandes sont modulées par une première fréquence de modulation et la vitesse d'un entraînement (11) ou les vitesses d'un groupe d'entraînements (11) sont modulées par une seconde fréquence de modulation.
  11. Procédé selon l'une des revendications 7 à 10, caractérisé en ce que lors de la modulation des vitesses des entraînements (11) de la machine de traitement de bandes, les couples de tous les entraînements (11) sont mesurés en tant que grandeurs d'influence.
  12. Procédé selon l'une des revendications 8 à 10, caractérisé en ce que lors de la modulation des vitesses des différents entraînements (11) isolés, les positions et/ou les nombres de tours des entraînements (11), dont les vitesses ne sont pas modulées, sont mesurés.
  13. Procédé selon l'une des revendications 9 à 12, caractérisé en ce que les premiers résultats de mesure obtenus lors de la modulation des vitesses de tous les entraînements (11) sont mis en relation avec des seconds résultats de mesure, lesquels sont obtenus lors de la modulation réalisée de manière simultanée ou alternée des vitesses d'entraînements (11) pris isolément.
  14. Procédé selon la revendication 13, caractérisé en ce que les différences entre les premiers et seconds résultats de mesure sont établies.
  15. Procédé selon l'une des revendications 1 à 14, caractérisé en ce que celui-ci est utilisé sur une machine de traitement de bandes réalisée en tant que machine à imprimer (1, 1').
  16. Procédé selon l'une des revendications 1 à 14, caractérisé en ce que celui-ci est utilisé sur une machine de traitement de bandes réalisée en tant qu'une installation d'étirage de feuilles.
  17. Procédé selon l'une des revendications 1 à 14, caractérisé en ce que celui-ci est utilisé dans une machine de fabrication de papier ou de carton.
  18. Procédé selon l'une des revendications 1 à 14, caractérisé en ce que celui-ci est utilisé dans une refendeuse.
  19. Procédé selon l'une des revendications 1 à 14, caractérisé en ce que celui-ci est utilisé dans une machine de fabrication ou de traitement de tissus ou de denrées maillés au mètre.
  20. procédé selon l'une des revendications 1 à 14, caractérisé en ce que celui-ci est utilisé dans une installation de dressage pour dresser de la tôle.
EP20060006639 2005-06-29 2006-03-30 Procédé de fonctionnement d'une machine de traitement de bandes Active EP1739042B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510030280 DE102005030280B3 (de) 2005-06-29 2005-06-29 Verfahren zum Betrieb einer bahnverarbeitenden Maschine

Publications (2)

Publication Number Publication Date
EP1739042A1 EP1739042A1 (fr) 2007-01-03
EP1739042B1 true EP1739042B1 (fr) 2008-01-02

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EP20060006639 Active EP1739042B1 (fr) 2005-06-29 2006-03-30 Procédé de fonctionnement d'une machine de traitement de bandes

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DE (2) DE102005030280B3 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202007005402U1 (de) * 2007-04-13 2008-08-14 Aradex Ag Flexodruckmaschine
US9033200B2 (en) 2012-02-20 2015-05-19 Xerox Corporation Method and device for controlling tension applied to a media web
CN103879828B (zh) * 2014-03-25 2015-12-09 常熟市林芝电热器件有限公司 Ptc发热芯自动装配装置的绝缘薄膜带牵引结构

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6127861A (ja) * 1984-07-18 1986-02-07 Nec Corp 紙送り装置
DE19942031B4 (de) * 1999-09-03 2005-10-06 Man Roland Druckmaschinen Ag Verfahren zum Betreiben einer Rollenrotations-Druckmaschine
DE10053756A1 (de) * 2000-10-30 2002-05-08 Rieter Ag Maschf Spinnmaschine
DE10227290A1 (de) * 2002-06-19 2004-01-08 Barmag Ag Vorrichtung zum Führen, Behandeln und Fördern von zumindest einem Faden

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DE502006000253D1 (de) 2008-02-14
DE102005030280B3 (de) 2006-09-28
EP1739042A1 (fr) 2007-01-03

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