EP1136257B1 - Procédé de commande de la tension d'une bande et machine rotative offset d'impression pour bandes. - Google Patents

Procédé de commande de la tension d'une bande et machine rotative offset d'impression pour bandes. Download PDF

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Publication number
EP1136257B1
EP1136257B1 EP01104520A EP01104520A EP1136257B1 EP 1136257 B1 EP1136257 B1 EP 1136257B1 EP 01104520 A EP01104520 A EP 01104520A EP 01104520 A EP01104520 A EP 01104520A EP 1136257 B1 EP1136257 B1 EP 1136257B1
Authority
EP
European Patent Office
Prior art keywords
web
printing
tension
printing press
units
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
EP01104520A
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German (de)
English (en)
Other versions
EP1136257A2 (fr
EP1136257A3 (fr
Inventor
Kevin Francis Albert
David Charles Burke
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.)
Goss International Americas LLC
Original Assignee
Goss International Americas LLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Goss International Americas LLC filed Critical Goss International Americas LLC
Publication of EP1136257A2 publication Critical patent/EP1136257A2/fr
Publication of EP1136257A3 publication Critical patent/EP1136257A3/fr
Application granted granted Critical
Publication of EP1136257B1 publication Critical patent/EP1136257B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S101/00—Printing
    • Y10S101/42—Means for tensioning webs

Definitions

  • the present invention relates to a method for controlling the web tension and a web-fed rotary offset printing machine according to claims 1 and 8.
  • a printing machine and a method for switching between printing and non-printing operation is disclosed in U.S.P. EP1136258 described, which is not pre-published prior art.
  • a continuous web In web presses, a continuous web, z. As a paper web, printed. During printing, various printing cylinders act on the web and transfer color to it. In a web printing on both sides four-color offset printing form z. B. four Crummituchzylindercrue pressure column, through which the web is felt. The blanket cylinders contact the web and cover both sides of the web with paint.
  • the printing press is frequently also to run in a non-printing operating state, in which the printing press cylinders contacting the web are brought into print off, so that the web is not printed.
  • the blanket cylinders in a printing unit of a web-fed rotary offset printing press can be offset from each other so that no ink is applied to the web while it continues to pass through the printing unit.
  • Fig. 1 Fig. 12 is a graph showing the changes in web tension in a prior art roll bowing machine in pounds per linear inch (pli) versus time represents.
  • the web tension is kept constant at the web feed, for example by means of a dancer roll and / or a PID controller (proportional, integral and differential controller).
  • a PID controller proportional, integral and differential controller.
  • the web tension of the printing units to a first Switzerlandwalzenspalt in a cooling unit is indicated for example by the arrow 2, the web tension from the last cooling nip to a longitudinal cutting unit by the arrow 3 and the web tension from the longitudinal cutting unit to a folder in which the web in Signs is cut, by the arrow 4. It is clear that when Druckbei ein the web tension drops abruptly when the web is passed through the downstream of the printing units sections of the printing press.
  • the Bardac SP 1070PID controller controls one arm of a dancer roller.
  • the web tension is effected via a PID controller by changing the force acting on the arm.
  • the voltage regulators have not hitherto been used to detect transient events, e.g. B. short-term Druckbei ein or print-off, since the active web tension control in the printing units downstream sections of the printing press in response to such events would lead to unacceptable changes in the position of the images with respect to a cut edge of the resulting signatures.
  • the method of controlling web tension in a web-fed rotary offset printing press including a feeder or infeed, printing units, and a folder, provides for increasing the drawing tension of the web between the feeder and the printing units when the printing units change from non-printing to printing be switched, and that the feed tension in the web is reduced when the printing units are switched from printing to non-printing operation.
  • the web tension can be maintained in the downstream of the printing units sections of the printing press at a constant level, so that the risk of web breaks and damage to the printed products is reduced.
  • the change in tension in the feeder affects the printing operation to a lesser extent and also carries only a lower risk of web break, since no inking and dampening application has taken place yet.
  • the present invention further preferably provides that the web tension after the printing units, ie in the web running direction behind the printing units, is kept substantially constant.
  • the voltage level is preferably controlled by a PLC (Programmable Logic Controller) connected to the various sections of the printing machine via a Local Area Network (LAN).
  • the web tension control can be done for example via dancer rolls, as in the US 4,838,498 and the US 5,791,541 is described, or by controlling the speed of different rollers, z. B. of a web guide gap forming rollers, by means of a drive control.
  • PID control algorithms of the PLC are used and information is transmitted over the LAN.
  • the PLC can be controlled via an external control unit, eg. Eg via a RS 232 bus.
  • the external control unit may be, for example, a Pentium PC.
  • the printing machine preferably comprises a cooling unit for cooling the material web after passing through the dryer. After leaving the printing units, the web thus first contacts a draw nip in the cooling unit and thus defines a section between the printing units and the cooling unit. Subsequently, the web is fed, for example via cooling rollers, to a longitudinal cutter, which likewise comprises a draw-nip, so that a section between the cooling unit and the longitudinal cutter is defined. Between the slitter and the folder comprising a cutter, another section is defined. If no slitter is provided, there will be a section between the chiller and the slitter.
  • the voltage can be set in each of the defined sections of the printing machine and even when switching between the printing operation and the non-printing operation, a stable web tension can be achieved after the printing units.
  • the web tension is preferably kept substantially the same after the printing units in non-printing operation and in printing operation. "Substantially equal” here means in terms of web tension that this does not change more than in the case of minor disturbances, eg. B. when changing roles or during a wash.
  • a rotary web offset printing press comprises a feeder for drawing in a material web to be printed, at least one printing unit for printing on the material web, a folding apparatus in which the material web is cut into signatures, and a control unit for controlling the web tension between the feeder and the printing units and between the printing units and the folder.
  • the at least one printing unit is operable in the printing operation and in the non-printing operation, and the control unit controls the web tension between the feeder and the at least one printing unit in response to the switching between the printing operation and the non-printing operation.
  • the web-fed rotary printing machine preferably further comprises a chiller and a slitter disposed between the printing units and the folder.
  • a LAN may be provided to control and adjust the tension in each section of the press from the feeder to the folder.
  • the control can be done by means of dancer rollers or by controlling the speed at the feeder and at the various Werwalzenspalten in the printing press.
  • the print nips are typically set to web speed and are not necessarily controlled by the controller.
  • the control unit is preferably a PLC, which in turn is controlled by an external control unit.
  • the control unit may be supplied with data regarding the tension in the various web sections and the operating status of the printing units.
  • Fig. 2 is a schematic representation of a printing machine 10 according to the invention.
  • a first web 8 and a second web 9 are provided in a roll stand or feeder 12.
  • the first web 8 is guided through a first printing unit group 14 and the second web 9 through a second printing group 16.
  • the web can be printed with a four-color image, and each of the printing units is preferably formed as an offset printing unit with a blanket cylinder and a plate cylinder.
  • the webs 8, 9 are each passed through a dryer 20 or 30, which passes the web usually without contact and in which the web is dried under heat. Thereafter, the webs 8, 9 are each guided in a cooling unit 22 and 32 with an entry nip and an exit roller.
  • the next processing station of the webs 8, 9 is a slitter 34 in which the webs can be partially cut but always pass a longitudinal cutting nip. Subsequently, the webs 8, 9 can be brought together and cut in a folder 36 in signatures.
  • the printing machine further includes a PLC 50 connected to a LAN 40. Furthermore, a drive control unit 52 may be provided, which regulates the speed with which the web is passed through the cooling unit.
  • the PLC 50 may be controlled by an external control unit 60, e.g. As a PC, controlled and programmed.
  • the present invention can equally well be used in a printing press in which only one web of material is printed.
  • Fig. 2 shows example values for the desired web tension in various sections of the printing machine 10 during the printing operation.
  • a web tension of 3-4 pli be desired, while the desired web tension between the respective group of printing units 14, 16 and the cooling units 22 and 32, for example 2-3 pli and between the cooling units 22, 32 and the folder 1.5 -2 pli, where 1 pli is equal to 173 N / m.
  • the web tension can be adjusted by means of dancer rollers controlled via the LAN 40 and / or by means of drive gaps or nips of tension roller pairs controlled via the LAN 40.
  • the web tension can be controlled both in the printing operation and in the non-printing operation of the printing press.
  • the use of PID controller algorithms is particularly advantageous for this purpose.
  • the desired web tension depends on the type of printing press and the type of substrate.
  • the web tension can be adjusted in non-printing operation of the printing press by means of the PLC in different sections of the printing press.
  • a voltage of 1.4 pli are set, as the graph 71 indicates, in the section between the cooling unit and the folder a voltage of 1.7 pli, as the graph 72 indicates, and in the inlet region of the cooling units, a voltage of 2, 5 pli, as graphs 73 and 74 indicate, which converge in the non-printing state of the printing press, since the printing nips are not active.
  • the control unit 50 When the control unit 50 receives a signal that initiates a switch from non-printing operation to printing operation, the control unit 50 sends a pulse signal to the feeder 12, which may include a dancer roller, to increase the pull-in tension from 2.5 pli to about 4.0 pli to increase, as the graph 74 indicates.
  • the feeder 12 which may include a dancer roller
  • the actually desired voltage increase may vary depending on the printing speed, the type of printing machine and the printing substrate and may be determined partly or completely in advance based on empirical values or else determined by prediction methods.
  • the web tension in the sections downstream of the printing units can be slightly changed by means of the PLC in order to obtain the web tension.
  • major changes in web tension during printing are undesirable because they affect the quality of the printing and cutting process.
  • the present invention offers operational advantages for a printing press, since the sections following the printing units, in which web breaks and damage frequently occurred, offer a more stable environment.
  • the web tension in the infeed is controlled by changing a voltage command depending on the printing speed, which is an input or input to the PLC.
  • the area between the chill rolls and the folder is preferably controlled by means of a PID controller algorithm, the voltage of the section forming the input value and the gain in the area of the chill rolls (so-called gain) the output value or output.
  • the voltage as such can z. B. be regulated by accelerating or decelerating a drive motor of the cooling rollers.
  • the sequential tuning of the draw rolls in different sections of the printing press, the z. B. by a can also be controlled in order to optimize the voltage regulation. So z. B.
  • the PLC can z. For example, give and disable commands to the pull rolls, as well as cooling gain commands and / or voltage setpoint commands.

Claims (14)

  1. Procédé de régulation de la tension d'une bande dans une machine rotative d'impression offset qui comporte une entrée (12), des éléments d'impression (14, 16) et un appareil de pliage (36), caractérise par les étapes de procédé suivantes :
    augmentation de la tension d'entrée dans la bande (8, 9) entre l'entrée (12) et les éléments d'impression (14, 16) lorsque les éléments d'impression (14, 16) passent du mode de non impression au mode d'impression, et
    réduction de la tension d'entrée dans la bande (8, 9) lorsque les éléments d'impression (14, 16) passent du mode d'impression au mode de non impression, sachant qu'en mode de non impression, les cylindres d'élément d'impression sont amenés en position d'arrêt d'impression.
  2. Procédé selon la revendication 1,
    caractérisé en ce que
    la tension d'entrée est augmentée de telle manière que lors du passage du mode d'impression au mode de non impression, une tension sensiblement similaire soit maintenue dans la bande (8, 9) vu dans le sens de la marche de la bande derrière les éléments d'impression (14, 16).
  3. Procédé selon la revendication 1 ou 2,
    caractérisée en ce que
    la tension est commandée à l'aide d'un contrôleur programmable (50).
  4. Procédé selon la revendication 3,
    caractérise en ce que
    le contrôleur programmable (50) est relié à un réseau local (40).
  5. Procédé selon la revendication 3 ou 4,
    caractérisé en ce que
    la tension de la bande derrière les éléments d'impression (14, 16) est commandée à l'aide du contrôleur programmable (50) de telle manière qu'une tension sensiblement similaire soit maintenue dans la bande (8, 9) pendant le passage du mode d'impression au mode de non impression.
  6. Procédé selon l'une quelconque des revendications 1 à 5,
    chacun des éléments d'impression (14, 16) étant réalisé comme un élément d'impression offset avec un cylindre de blanchet et un cylindre porte-plaques.
  7. Procédé selon l'une quelconque des revendications 1 à 6,
    chacun des éléments d'impression (14, 16) étant dans un groupe d'éléments d'impression et la bande étant imprimée dans chaque groupe d'éléments d'impression avec une image quadricolore.
  8. Machine rotative d'impression offset avec une entrée (12) pour l'entrée d'une bande de matériau (8, 9) à imprimer, avec au moins un élément d'impression (14, 16) pour l'impression de la bande (8, 9) qui peut fonctionner en mode d'impression et en mode de non impression, avec un appareil de pliage (36), dans lequel la bande (8, 9) est coupée en signatures, et avec une unité de commande (50) pour la commande de la tension de la bande entre l'entrée (12) et l'élément d'impression (14, 16) ainsi qu'en aval de l'élément d'impression (14, 16), caractérisée en ce que l'unité de commande (50) est réalisée de telle manière que la tension entre l'entrée (12) et l'élément d'impression (14, 16) soit commandée en fonction d'une transition entre le mode d'impression et le mode de non impression et les cylindres d'élément d'impression étant amenés en position d'arrêt d'impression en mode de non impression.
  9. Machine rotative d'impression offset selon la revendication 8,
    caractérisée par
    un groupe de refroidissement (32) et un découpeur longitudinal (34) qui sont disposés entre les éléments d'impression (14, 16) et l'appareil de pliage (36).
  10. Machine rotative d'impression offset selon la revendication 8 ou 9,
    caractérisée par
    un réseau local (40) relié à l'unité de commande (50).
  11. Machine rotative d'impression offset selon l'une quelconque des revendications 8 à 10,
    caractérisée en ce que
    l'unité de commande (50) est un contrôleur programmable.
  12. Machine rotative d'impression offset selon la revendication 8,
    caractérisée en ce que
    l'unité de commande (50) reçoit des entrées relatives au mode d'impression et à la vitesse d'impression.
  13. Machine rotative d'impression offset selon l'une quelconque des revendications 8 à 12,
    caractérisée en ce que
    chacun des éléments d'impression (14, 16) est réalisé comme un élément d'impression offset avec un cylindre de blanchet et un cylindre porte-plaques.
  14. Machine rotative d'impression offset selon l'une quelconque des revendications 8 à 13,
    chacun des éléments d'impression (14, 16) étant dans un groupe d'éléments d'impression et la bande est imprimée dans chaque groupe d'éléments d'impression avec une image quadricolore.
EP01104520A 2000-03-24 2001-03-02 Procédé de commande de la tension d'une bande et machine rotative offset d'impression pour bandes. Expired - Lifetime EP1136257B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US09/534,466 US7017485B2 (en) 2000-03-24 2000-03-24 Device and method for controlling web tension
US534466 2000-03-24

Publications (3)

Publication Number Publication Date
EP1136257A2 EP1136257A2 (fr) 2001-09-26
EP1136257A3 EP1136257A3 (fr) 2003-03-19
EP1136257B1 true EP1136257B1 (fr) 2011-11-09

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EP01104520A Expired - Lifetime EP1136257B1 (fr) 2000-03-24 2001-03-02 Procédé de commande de la tension d'une bande et machine rotative offset d'impression pour bandes.

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Country Link
US (1) US7017485B2 (fr)
EP (1) EP1136257B1 (fr)
JP (1) JP5419312B2 (fr)
AT (1) ATE532631T1 (fr)
DE (1) DE10110122B4 (fr)

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US7017485B2 (en) * 2000-03-24 2006-03-28 Goss International Americas, Inc. Device and method for controlling web tension
WO2003066492A1 (fr) * 2002-02-05 2003-08-14 Koenig & Bauer Aktiengesellschaft Procede et dispositif pour reguler la tension d'une bande
DE10345593A1 (de) * 2003-09-29 2005-07-07 Koenig & Bauer Ag Verfahren zur Bestimmung von produktionsrelevanten Materialeigenschaften der Bedruckstoffe und/oder von Aufzügen
FR2895305B1 (fr) * 2005-12-27 2009-04-17 Goss Int Montataire Sa Presse d'impression a engagement de bande ameliore et procede d'engagement de bande correspondant.
DE102006008835B4 (de) * 2006-02-25 2008-08-21 Koenig & Bauer Aktiengesellschaft Druckmaschine mit Bahnspannungsregelung
JP2008023751A (ja) * 2006-07-18 2008-02-07 Mitsubishi Heavy Ind Ltd 輪転印刷機およびその運転方法
JP2008105277A (ja) * 2006-10-25 2008-05-08 Mitsubishi Heavy Ind Ltd 印刷機の運転方法および印刷機
DE102009010023A1 (de) * 2009-02-21 2010-08-26 Robert Bosch Gmbh Verfahren zur Bahnspannungseinstellung bei einer Bearbeitungsmaschine
DE102009016206A1 (de) * 2009-04-03 2010-10-14 Robert Bosch Gmbh Verfahren zur Bahnspannungseinstellung
US9079426B2 (en) 2010-06-24 2015-07-14 Hewlett-Packard Development Company, L.P. Duplexing web press with drying time control
US8770878B2 (en) 2011-02-08 2014-07-08 Xerox Corporation System and method for monitoring a web member and applying tension to the web member
DE102011101842A1 (de) * 2011-05-17 2012-11-22 Robert Bosch Gmbh Verfahren zum Regeln der Bahnspannung in einer Bahnbearbeitungsmaschine
DE102011054693B4 (de) * 2011-10-21 2019-05-16 Océ Printing Systems GmbH & Co. KG Verfahren zur Ausführung einer Pausenfunktion während des Druckbetriebs bei einem Tintendruckgerät
US9033200B2 (en) 2012-02-20 2015-05-19 Xerox Corporation Method and device for controlling tension applied to a media web
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US20140232776A1 (en) * 2013-02-15 2014-08-21 Thomas Niertit Method for controlling tension in a web
CN103204011B (zh) 2013-03-19 2016-06-01 辽宁超烁图码科技板业有限公司 一种适用于建筑物外墙的图码保温板的辊涂生产方法
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Also Published As

Publication number Publication date
DE10110122B4 (de) 2013-11-07
ATE532631T1 (de) 2011-11-15
EP1136257A2 (fr) 2001-09-26
DE10110122A1 (de) 2001-09-27
JP5419312B2 (ja) 2014-02-19
EP1136257A3 (fr) 2003-03-19
JP2001310875A (ja) 2001-11-06
US7017485B2 (en) 2006-03-28
US20030079629A1 (en) 2003-05-01

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