EP2191970B1 - Procédé de réglage du registre dans une presse - Google Patents

Procédé de réglage du registre dans une presse Download PDF

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Publication number
EP2191970B1
EP2191970B1 EP09014763A EP09014763A EP2191970B1 EP 2191970 B1 EP2191970 B1 EP 2191970B1 EP 09014763 A EP09014763 A EP 09014763A EP 09014763 A EP09014763 A EP 09014763A EP 2191970 B1 EP2191970 B1 EP 2191970B1
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EP
European Patent Office
Prior art keywords
unit
measuring
register
image
printing
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EP09014763A
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German (de)
English (en)
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EP2191970A3 (fr
EP2191970A2 (fr
Inventor
Klaus Reckefuss
Gerhard Lohmeyer
Bernd Morgenstern
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BST Eltromat International Leopoldshoehe GmbH
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Eltromat GmbH
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Publication of EP2191970A2 publication Critical patent/EP2191970A2/fr
Publication of EP2191970A3 publication Critical patent/EP2191970A3/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control

Definitions

  • the invention relates to a method for controlling the register in a printing press according to claim 1.
  • a web-fed printing press in question consists of at least two printing units, each of which consists of at least one cylinder having a printing plate on its surface and a second cylinder, between which the object to be printed, as a rule, a printing web or a printed sheet for the purpose of printing passed becomes.
  • each printing unit usually from each printing unit printed at least one mark whose respective position is measured to the printed by another printing unit marking or other position information from the printing press, for example, the rotation angle information of one of the above-mentioned cylinder. From the deviation from a target position, which represents a good pressure, a register correction signal is generated, which is then carried out by suitable devices (such as register rollers) and so again produces a fitting pressure.
  • suitable devices such as register rollers
  • the DE 10 2005 019 566 A1 describes in Fig. 1 a register controller for a gravure printing machine with the typical components, in particular depending on a drive device and a measured value recording device in each printing unit.
  • the DE 10 2005 054 975 describes a control system for the register in a printing press, which has at least one printing unit and the control system has at least one register controller, wherein a pilot control variable and a register size are used to influence the register.
  • the application claims in particular in claim 12 (Offenlegungsschrift of 25/04/2007) that the printing press has only a single data bus for the transmission of the register error estimation and the pilot control quantity and the transmission of rotational speed variables and position variables for the speed control.
  • EP 1 619 026 A1 shows a printing machine with a device for triggering an image pickup unit and / or a lighting device.
  • the invention relates to a device for triggering an image recording unit and / or a lighting device, wherein the image recording unit and the lighting device each belong to an inspection system arranged in a printing machine, wherein the inspection system inspects a printing material printed in the printing press, wherein a control unit controls the image recording unit and / or the illumination device triggers, wherein the control unit triggers the image recording unit and / or the illumination device in each case depending on a Leitachsposition a defined in the printing machine leading axis.
  • DE 10 2006 009 434 A1 shows a method and apparatus for the timely detection of regularly located on a printing line print marks.
  • cameras are used with a computer associated with the camera. The triggering of the camera is no longer triggered externally to capture the print marks.
  • the drive control system which controls movement of the printing web, is connected to a bus on which the cameras and thus the computing units are also terminated. It is thereby possible that the drive control system supplies the arithmetic units with process data that the arithmetic units can use to calculate acquisition times. Due to the calculation, the camera is triggered autonomously by the cameras with the arithmetic units themselves.
  • WO 2004/028805 A1 shows a drive device and method for driving a processing machine.
  • a plurality of units are mechanically independent of each other Driven drives, and guided signals of Leitachsposition a virtual master in at least one of the drives of these units connecting signal line.
  • the drives are each assigned an offset which defines a permanent but changeable shift of a target Wikellage relative to the Leitachsposition.
  • Fig.1 a schematically greatly simplified block diagram for explaining the structure of the control device according to the invention
  • Fig. 2 a graph explaining the determination of the register deviation
  • Fig. 3 an example for a measuring field
  • Fig. 4 a schematically simplified representation of a receiving line with along the web running direction arranged print marks
  • Fig. 5 a graph in which pixel numbers of a task line are plotted over line captures
  • Fig. 6 a schematically simplified illustration of another embodiment of the register control device, which uses a line scan camera in this case.
  • a real-time bus system 12 is used for signal transmission for the measured values and for an exactly determined acquisition of the measuring signals.
  • the essential thing is that all events on the bus system 12 are permanently synchronized with a common clock (eg according to the specification of the IEE1588).
  • a register control device 17 according to the invention for a printing press 18 therefore has Fig. 1 in addition to the drive control device for the electrical machine as a subscriber of such a bus system 12 and, among other possible further bus subscribers at least one register control unit 3, 7, a trigger unit 4, 8, which causes the generation and processing of synchronous information, and a measuring unit 2, 6 with a measuring head 1, 5 on.
  • the execution of all units as subscribers to one and the same real-time bus system 12 also allows a single trigger unit to be associated with multiple units of measurement and / or control units.
  • a modification may be, for example, that the trigger unit is integrated into a measuring unit.
  • a fixed assignment of a specific measuring unit to a specific register control unit no longer exists, but instead of all available data from each register control unit, the information required for its assigned function can be read and processed.
  • data obtained from a plurality of measuring units can also be used by a register control unit to calculate a register correction value.
  • a common embodiment for the detection of register deviations uses, for example, the measurement of a positional position of marks, of which in the printing process at least by a printing unit such a periodic, usually per print size, is printed on the web.
  • a printing unit such as a periodic, usually per print size
  • the position of this mark is either determined relative to the position of a mark printed by another printing unit, or the determined position of at least one printed mark is determined by a Position information that is directly related to the rotational angular position of a pressure-forming cylinder (or a cylinder carrying the image), compared. From this, a positional information of the printed mark is calculated.
  • the two processes are referred to as either web / web or web / cylinder processes.
  • the marks For measurement, the marks must be printed in a relatively small acquisition window in the circumferential direction. Within that then the measurement takes place.
  • Such a measurement is usually carried out optically by means of an optical reflection scan, wherein the position of the print marks in the longitudinal and lateral direction are determined from an image (or a time course of the light remission when passing a measuring head measuring in the form of a dot). This is done, for example, by using a known edge detection method.
  • position information of individual printing cylinders in Fig. 1 Cylinder 13, 14 representative of all cylinders
  • a superordinate other rotation angle information source eg, a virtual master 11
  • reference data e.g, so-called time stamps or alternatively also bus cycles
  • a position information transmitted in this way is then used by a trigger unit 4 or 8 in order to calculate the time of the start of a measuring operation and to feed one or more sensors for triggering a predetermined functional sequence, for example initiation of a measuring operation.
  • Position information can also be transmitted several times per print format via the bus system.
  • the transmission of each of these information takes place very precisely in a common temporal context.
  • the trigger unit 4 or 8 in particular advantageously additionally a further refined, to the temporal context of the bus 12 is always synchronous own division generated that a highly accurate temporal resolution between the above reference data (time stamps) delivers (s. Fig. 2 ). From known position information originating, for example, from the printing cylinder, and the associated time information, a future point in time is calculated at which a measuring process is triggered via a trigger signal. The time of this trigger signal should advantageously be as close as possible to the last reference date, so that the assignment of positions to the measurement object takes place at a predetermined location with the greatest possible accuracy.
  • the trigger signal is either used directly to trigger the measuring process, or the previously calculated triggering time for triggering is transmitted via the bus system to the measuring system. This ensures that each measurement always takes place very exactly at the same location of the printed web and / or very precisely at a predetermined angular position of the forme cylinder of a printing press.
  • This method of operation in particular when using a web / cylinder method, generates the highest accuracies in determining the position of the printed image printed by a printing unit.
  • a measuring system can basically be started both with a reflective or transmitted light web scanner conventional design as well as with a surface camera by a start signal generated in this way a measurement process.
  • a use of printing marks and a scanning by means of an optical measuring head under which the printing marks pass see also FIG Fig. 3 ). Shown is in Fig. 3 an ID field 100 and print marks x2 to xN.
  • the optical reflection probe records a brightness curve and evaluates (see, for example EP 0 637 286 ) detects the detected signals as position information by, for example, detected edges of print marks and these converted with the knowledge of their size and shape (and possibly also their order) into position information of the individual print marks. Decisive for the accuracy is the correct assignment of the time course of the electrical signal and the position of the printed web. For this purpose, from the existing position information and time information derived a speed-dependent sampling rate for the digitization of the brightness curve. This makes the entire recording practical speed-independent and thus, by a highly accurate constant number of measuring points per track, the required measurement accuracy for the task.
  • the measured data are stored with associated time stamps.
  • angle position information and timestamp are stored.
  • the digitized progress signal is evaluated as usual (for example, edges are detected).
  • the data measured in the progress signal for the position of the print marks are then converted by means of the stored position information and time stamp on a real metric position.
  • the bus cycle time and bus topology delays have no impact on the measurement result, thus significantly increasing the accuracy and reproducibility of the measurement over previous methods that use an independently generated sampling rate.
  • the result of the position measurement calculated in this way is transmitted via the real-time bus 12 to the register control unit 3 or 7. In this sense, it may also be advantageous to transmit only measured value deviations from a known setpoint position.
  • the register control unit 3 or 7 calculates a correction command for the drive control from the position or position deviation data in application of a control algorithm and, if necessary, adding data from another source, and sends this via the same bus 12 to one or more drive controllers 9 and 10.
  • an area camera or a comparable image-receiving sensor is used in the measuring head 1 or 5, the procedure is analogous to the above method. Only in place of the edge detection method is an image evaluation which uses other methods for determining the position of the object print mark (here then usually in a small point-like configuration), for example object isolation and / or center of gravity determination. The described digitization of an analogue course using a high-precision sampling rate would then be omitted.
  • a fundamental problem with the use of a matrix camera is that field size and resolution depend on each other.
  • the wedge-shaped print marks which are arranged at a relatively large distance from each other would require such a large image field with a simultaneous image recording of all brands by means of a single camera recording that would not be sufficient with the use of conventional cameras, the spatial resolution of the recorded image to the marks still be able to measure with sufficient accuracy.
  • Assembling several images obtained from successive prints into an overall image of all the print marks has several drawbacks, firstly that many meters of material are needed in the printing press and secondly that the sub-images come from different situations.
  • a line camera For image recording, a line camera is used, which captures image lines in a fixed, very well-defined and controlled sequence of the traversing under the camera web and joins them together to form an image whose extension in the web direction X represents a time axis and transverse to a path axis Y.
  • the register control system has a high-precision synchronized at all measuring points and high-resolution, tied to the means of locomotion of the web and thus location-related clock sequence, which is formed from the time axis.
  • time information from the drive bus of the printing press is used to generate this time axis, so that a highly precise relationship with the movement of the printed web is ensured.
  • the receiving device exists accordingly Fig. 6 from a line camera 1 ", which consists of a sensor with a multiplicity of sensor elements arranged side by side (for example a CCD line with at least 500 elements) and a lighting device 6", a recording control, which, for example, is triggered by the trigger unit 4 (FIG. Fig. 1 ) is caused, an image processing unit, for example, in the measuring unit 2 from Fig. 1 is realized and consists of a bus interface, which is the real-time bus system 12 in the present example.
  • the overall device is designed to operate in different modes of operation that differ substantially from one another by different sampling modes and evaluation modes.
  • the trigger unit, the measuring unit and other components affected by the switchover are correspondingly initialized by a higher-order central unit.
  • the camera works depending on the type and size of the marks to be measured, with different line recording regimes to create an overall picture.
  • a scanning mode can be selected, which generates an overall image, which also have gaps may (see also Fig. 4 ). From the a priori knowledge of the geometry of the marks can be easily ignored the gaps in the image in the evaluation. This procedure ensures that the amount of image information remains as small as possible and in particular redundant or irrelevant information (for example, image parts not to be considered for register measurement) is largely avoided.
  • the sensor line of the line scan camera is arranged at an angle to the web movement direction, which is not 90 °. (For example, 45 °) Recording and evaluation are made, as already mentioned, in different modes depending on the type of mark (e.g., wedge or dot mark).
  • a punctiform pattern is used, the shot is switched to a mode that captures a gap-free image of the corresponding pattern.
  • the evaluation then proceeds in exactly the same way as would be the case with an image taken by a matrix camera, since in this mode a complete image is produced which is close to that of a matrix camera and can also be evaluated accordingly.
  • an object search is carried out here for punctiform image objects of known size with subsequent center of gravity determination, the focal points being regarded as representative of the position of the printed marks.
  • a flash light source for example a line-shaped LED arrangement
  • a light source generates less heat in its environment.
  • it is particularly advantageous to be able to produce an illumination spectrum for example by means of a suitable spectral mix of the emitting elements, which produces a maximum contrast with respect to the printed image parts to be scanned.
  • the above-described example with a line camera is not necessarily bound to a real-time bus as described above, its use merely represents a very advantageous embodiment with high measurement accuracy.
  • a pulse sequence with sufficiently accurate resolution for example, is sufficient is generated by a pulse multiplication, which in turn is synchronized with a printing cylinder.
  • it may also be advantageous to print at least one geometrically known pattern e.g., two known spaced marks, from which an additional geometry measure for the captured image can be calculated.
  • a system operated according to the invention allows regulation in a completely decentralized mode of operation as well as in a centralized manner.
  • a control unit assumes all tasks for determining the register adjustment variables. Reading of measured data, control of the measuring and triggering units and output of the correction quantities to the drive units take place via the real-time bus.
  • Reference numeral 15 denotes a center.
  • Reference numeral 1 stands for "timestamp / reference datum (real-time bus) Tn, T (n + 1, ..)".
  • Reference numeral 2 stands for "synchronous own division”.
  • Reference numeral 3 stands for "triggering of the measuring process”.
  • Reference numeral 4 stands for "reference value marks”.
  • Reference numeral 5 stands for "measured actual value register mark”.
  • Reference numeral 6 stands for "register deviation”.
  • Reference numeral 2 stands for" printing web ".
  • Reference numeral 3 stands for web running direction
  • Reference numeral 5 stands for" recording line ".
  • Reference numeral 1 "'stands for” web running direction ".
  • Reference numeral 2 ' stands for receiving cell

Claims (15)

  1. Procédé de réglage du registre dans une presse rotative (18) par un élément de réglage de registre (17), la presse présentant au moins 2 groupes d'impression (DWn-1 à DWn+2), dont chacun présente au moins un cylindre (13) qui porte une image d'impression à transférer, et au moins un cylindre (14) qui presse la substance à imprimer (16) contre celui-ci, et l'élément de réglage de registre (17) présentant au moins une unité de mesure (2, 6) et une tête de mesure (1, 5), une unité de réglage de registre (3, 7), une unité de déclenchement (4, 8) et une unité d'entraînement (9, 10), ces parties (2, 6 ; 1, 5 ; 3, 7 ; 4, 8 ; 9, 10) de l'élément de réglage (17) étant reliées entre elles par un système de bus fonctionnant en temps réel (12), dans lequel tous les participants du bus sont synchronisés ensemble temporellement, avec les étapes de procédé suivantes :
    a. pour chaque déclencheur et/ou unité de mesure et/ou unité de réglage de registre, une date de référence est générée et transmise par le système de bus (12), laquelle se réfère à une référence temporelle commune à tous qui est constituée par le système de bus (12),
    b. un intervalle de temps limité par au moins 2 dates de référence émises temporellement l'une après l'autre est de plus divisé par l'unité de déclenchement par émission d'au moins un signal de temps se trouvant entre les dates de référence,
    c. un signal de déclenchement d'un processus de mesure à réaliser par la tête de mesure est sélectionné par l'unité de déclenchement d'après la suite de signaux formée après (b),
    d. la tête de mesure détecte un modèle imprimé qui est une partie de l'image d'impression imprimée, et
    e. des informations sur la position de l'image d'impression transmise respectivement par un groupe d'impression sont déterminées dans l'unité de mesure à partir du modèle palpé par la tête de mesure,
    f. des valeurs correctives sont calculées dans l'unité de réglage de registre à partir des informations sur la position qui ont été déterminées à partir d'une ou de plusieurs unités de mesure, ainsi qu'à partir d'autres sources d'informations transmises, et
    g. les valeurs correctives sont transmises aux unités d'entraînement et y sont mises en place.
  2. Procédé selon la revendication 1, le dispositif de mesure transmettant les informations sur la position par le système de bus fonctionnant en temps réel à au moins un participant de bus.
  3. Procédé selon la revendication 1, les valeurs correctives déterminées par l'unité de mesure étant transmises par le système de bus fonctionnant en temps réel aux unités d'entraînement.
  4. Procédé selon l'une quelconque des revendications précédentes, la tête de mesure étant une tête de balayage optique qui enregistre à l'aide d'un point lumineux une courbe de luminance suscitée par un ensemble de marques défilant et la numérise, un taux d'échantillonnage pour la numérisation dans l'unité de mesure étant constitué de manière synchrone aux dates de référence générées après les étapes a. et b. de la revendication 1.
  5. Procédé selon l'une quelconque des revendications précédentes, la tête de mesure contenant un capteur d'image à deux dimensions et réalisant la prise d'image déclenchée par l'unité de déclenchement.
  6. Procédé selon l'une quelconque des revendications précédentes, une unité de déclenchement générant les données pour plusieurs unités de mesure.
  7. Procédé selon l'une quelconque des revendications précédentes, une unité de réglage de registre pour plusieurs groupes d'impression déterminant des valeurs correctives de registre.
  8. Procédé selon la revendication 1, la transmission des informations sur la position et/ou des valeurs correctives de registre et/ou des informations de déclenchement est réalisée par le système de bus fonctionnant en temps réel.
  9. Procédé selon l'une quelconque des revendications précédentes, une unité de mesure déterminant des informations sur la position de plusieurs images d'impression imprimées par différents groupes d'impression.
  10. Procédé selon l'une quelconque des revendications précédentes, la tête de mesure étant réalisée comme un capteur enregistrant des images,
    a. qui enregistre des images avec un rapport de côtés qui s'élève perpendiculairement au sens de la marche de la bande à un multiple de celui-ci dans le sens de la marche de la bande,
    b. l'enregistrement d'une image étant commandé de sorte qu'une image soit enregistrée à chaque commande,
    c. la commande étant réalisée de sorte qu'une pluralité de telles images soit enregistrée sur un format d'impression, la distance entre 2 images pouvant être réglée différemment,
    d. ce réglage différent étant prescrit par une unité centrale (11) au déclencheur et/ou à l'unité de mesure comme mode de travail,
    e. une pluralité de telles images étant jointe pour former un cadre d'analyse,
    f. le cadre d'analyse étant analysé pour mesurer les écarts de registre en fonction du mode de travail de différente manière.
  11. Procédé selon la revendication 10, au moins un mode de travail générant une image complète.
  12. Procédé selon la revendication 10 ou 11, un champ de marque qui se compose de marques de point étant mesuré dans un mode et un champ qui se compose de marques de coin étant mesuré dans un second mode.
  13. Procédé selon la revendication 10, le capteur enregistrant les images étant une caméra linéaire.
  14. Procédé selon la revendication 13, la caméra linéaire étant orientée de sorte que la ligne de capteur soit inclinée dans un angle par rapport au sens de la marche de la bande, qui diverge de 90°.
  15. Procédé selon la revendication 14, la caméra linéaire étant disposée de manière rotative autour de son axe optique et sa rotation pouvant être commandée par un dispositif de réglage.
EP09014763A 2008-11-28 2009-11-26 Procédé de réglage du registre dans une presse Active EP2191970B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102008059584.5A DE102008059584B4 (de) 2008-11-28 2008-11-28 Verfahren und Vorrichtung zur Regelung des Registers in einer Druckmaschine

Publications (3)

Publication Number Publication Date
EP2191970A2 EP2191970A2 (fr) 2010-06-02
EP2191970A3 EP2191970A3 (fr) 2011-09-14
EP2191970B1 true EP2191970B1 (fr) 2013-02-27

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US (1) US8539883B2 (fr)
EP (1) EP2191970B1 (fr)
DE (1) DE102008059584B4 (fr)
ES (1) ES2404032T3 (fr)

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DE102008059584B4 (de) 2008-11-28 2021-11-18 BST eltromat International GmbH Verfahren und Vorrichtung zur Regelung des Registers in einer Druckmaschine
EP2481585B1 (fr) 2011-01-28 2015-12-16 Müller Martini Holding AG Dispositif et procédé de traitement d'une bande de matière d'impression pour produits d'impression
DE102013208964A1 (de) * 2013-05-15 2014-11-20 Robert Bosch Gmbh Registermarkensensor mit variabler Abtastrate
US10252555B2 (en) 2015-10-19 2019-04-09 Hydra Management Llc Instant ticket redundancy via multi-chromatic indicia
US10377162B2 (en) 2015-10-19 2019-08-13 Hydra Management Llc Instant ticket redundancy via multi-chromatic indicia
US10232247B2 (en) 2015-10-19 2019-03-19 Hydra Management Llc Instant ticket redundancy via multi-chromatic indicia
DE102016119292A1 (de) * 2016-10-11 2018-04-12 BST eltromat International GmbH Verfahren zum Prüfen einer Funktionseinheit für den Einsatz an einer laufenden Materialbahn

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DE102008059584B4 (de) 2008-11-28 2021-11-18 BST eltromat International GmbH Verfahren und Vorrichtung zur Regelung des Registers in einer Druckmaschine

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Publication number Publication date
DE102008059584B4 (de) 2021-11-18
DE102008059584A1 (de) 2010-06-02
EP2191970A3 (fr) 2011-09-14
ES2404032T3 (es) 2013-05-23
US20100139512A1 (en) 2010-06-10
US8539883B2 (en) 2013-09-24
EP2191970A2 (fr) 2010-06-02

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