EP0637286B1 - Device for detecting registration errors between individual colours during multicolour printing in a long web-fed rotary press - Google Patents

Device for detecting registration errors between individual colours during multicolour printing in a long web-fed rotary press Download PDF

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Publication number
EP0637286B1
EP0637286B1 EP94905086A EP94905086A EP0637286B1 EP 0637286 B1 EP0637286 B1 EP 0637286B1 EP 94905086 A EP94905086 A EP 94905086A EP 94905086 A EP94905086 A EP 94905086A EP 0637286 B1 EP0637286 B1 EP 0637286B1
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EP
European Patent Office
Prior art keywords
web
printing
register
register marks
fed rotary
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EP94905086A
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German (de)
French (fr)
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EP0637286A1 (en
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Hans W. Wehmeier
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ELTROMAT GESELLSCHAFT fur INDUSTRIE-ELEKTRONIK MBH
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ELTROMAT GESELLSCHAFT fur INDUSTRIE-ELEKTRONIK MBH
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    • 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
    • B41F13/025—Registering devices

Definitions

  • the invention relates to a device for determining the register error between the individual colors in multi-color printing in a long web web-fed rotary printing press, according to the preamble of claim 1.
  • any register error that may be present is first determined.
  • a generic device which is known, for example, from DE-C-40 37 728 or EP-A-0 095 437
  • there are two path sensors in each scanning head which can be designed, for example, in the form of fiber-optic sensors.
  • fiber optic sensors such as those e.g. are known from the brochure "Register control for gravure presses S-3100" from Bobst SA, because of their geometrical dimensions, the path sensors can only be arranged at a minimum distance of 18 mm from each other. From this it follows again that the registration marks must be arranged at a minimum distance of 20 mm from one another.
  • the register error is determined by measuring the registration marks of colors one and two, two and three, and three and four. A time signal is determined as the measured value, which, multiplied by the respective web speed, gives the register deviation.
  • the device according to the invention only a path sensor has to be mechanically adjusted, it being possible in principle to carry out a scanning on the roller.
  • web flutter can be prevented and the device according to the invention saves set-up time.
  • a level measurement is a measurement that the register deviation always relates to the first color.
  • the device according to the invention can be used to switch, preferably automatically, to the previously described level measurement, which results in a saving in waste.
  • the register or print marks are arranged one behind the other in the running direction of the material web.
  • the print marks can be optically scanned, as with a conventional double-path scanner, converted into an electrical analog signal and fed to the register controller.
  • advantageously only an electrical signal has to be fed to the register controller.
  • an electronic window is set by the evaluation device to select the registration marks to be scanned and evaluated. This selects the marks to be scanned so that at each measuring point, despite the aligned arrangement of the registration marks and despite the presence of only a single path sensor, the registration marks are always scanned and evaluated, which must be used to determine the respective register error.
  • a register control device with a controller 1 for monitoring a long web web-fed rotary printing press 2, as is known in principle from DE 40 37 728 C1 and in which the device according to the invention is integrated in the present case . Since the present invention is embodied both in a separate device for determining the register error and in a control device which comprises this device according to the invention in accordance with the claims of the present application, the complete disclosure content of DE 40 37 728 is supplemented by the disclosure of this application to supplement the disclosure content of this application Contents of this application made.
  • the long web web-fed rotary printing press 2 shown in FIG. 1 has four printing units 3 to 6 in the example, in which the colors yellow, red, blue and black are successively applied to a material web 7 to be printed.
  • each of the printing units 3 to 6 each has a printing cylinder 8, 9, 10 and 11 rotating in an ink bath.
  • the material web 7 is passed through the printing units 3 to 6 one after the other, whereby it is guided over the printing cylinders 8 to 11, respectively.
  • Each printing unit of the long web web-fed rotary printing press 2 also has a drying device 12, 13, 14 and 15, which is arranged downstream of the assigned printing cylinder 8, 9, 10 and 11, viewed in the direction of travel of the material web 7.
  • the drying devices 12 to 15 can be designed, for example, in the form of a drying drum.
  • the printing units 3, 4 and 5 are provided with a register roller arrangement with actuators 16, 17 and 18, which each have a correction motor 19, 20 and 21, respectively.
  • the register control device which represents a control device arranged in a housing (not shown), has a central unit 22 for recording and storing all control parameters and the control behavior.
  • the register control device preferably has control units designed as plug-in modules, of which the control unit 23 is shown in FIG. 1. These control units serve to regulate the longitudinal register and / or to combine the longitudinal and lateral register, and for this purpose act on the aforementioned correction motors 19 to 21 of the respective actuators 16, 17 and 18.
  • the device according to the invention for determining the register error between the individual colors in the multi-color printing carried out in the long web web-fed rotary printing press 2 is integrated in the overall arrangement illustrated in FIG. 1.
  • the device according to the invention has a scanning device 24, which comprises each measuring point in the printing units 4, 5 or 6 scanning heads 25, 26 and 27, and which contains the register or registration marks P1 to P4 (see FIGS. 2, 3 ) to capture.
  • the scanning heads 25, 26 and 27 are arranged at a suitable point in the printing units 4, 5 and 6 in the running direction L of the material web 7 behind the printing cylinder.
  • the scanning heads 25, 26 and 27 are connected to a signal recording unit of the scanning device 24, which in turn forwards the determined signals to an evaluation device 33 which is connected to the central unit 22 and which determines the relative positions of the individual registration marks P1 to P4 to one another.
  • the device according to the invention has only one single path sensor per scanning head 25 to 27, which is identified in FIG. 1 by the reference symbols T 1 or T 2 and T 3 .
  • the path sensors T 1 to T 3 are preferably designed as fiber-optic path sensors which optically scan the registration marks P1 to P4 and generate electrical analog signals which are fed to the evaluation device 33.
  • the evaluation device 33 uses the supplied signals to determine the relative positions of the registration marks P1 to P4 and the results are fed to the control unit 23 via the central unit 22, which in turn is connected to the correction motors 19, 20 or lines 40, 41 or 42. 21 is connected to perform the register correction.
  • FIG. 2 shows a section of the material web 7 with four print images 43, 44, 45 and 46 in the example.
  • the print images 43 to 46 are assigned the registration marks P1 to P4, which are on a side strip 47 of the print sheet 7 at Printing of print images 43 to 46 can also be printed on.
  • Fig. 2 illustrates the assignment of Path sensors T 1 to T 3 to print images 44, 45 and 46. Accordingly, only one path sensor T 1 , T 2 and T 3 is provided for each measuring point and scanning head, which scans the respective registration marks and generates the corresponding signals.
  • FIG. 3 shows the arrangement of the registration marks P1 and P2 and their spacing A from one another. It is clear from this illustration that the registration marks, viewed in the running direction L of the material web 7, are arranged in alignment one behind the other and are correspondingly detected by the respective web buttons T 1 , T 2 and T 3 .
  • the distance A can be minimized to 3-5 mm.
  • the distance A between two registration marks is resolved via a sensor, for example the rotary sensors 30, 31 and 32 shown in FIG. 1. 4, a counter is started by means of the leading edge V 1 of a first signal S1, which is stopped by the leading edge V 2 of the second signal S2 recorded by the respective path sensor.
  • the resulting counted number of pulses corresponds directly to the distance or the distance A between the registration marks (e.g. 5 pulses corresponds to 5 mm distance A), so that an immediate distance measurement can be carried out with the device according to the invention. If the determined distances deviate from the previously known actual distances between the registration marks, the respective register deviation can be determined.
  • FIGS. 5 and 6 For further explanation and disclosure of the device according to the invention, reference is made explicitly to FIGS. 5 and 6 below.
  • Each brand is digitized for the digitization and further processing of the brands. For this purpose, a separate goal (goal 1, goal 2 in FIGS. 5 and 6) is placed over each mark.
  • the principle of digitization for each brand can correspond to the principle for double track sensors.
  • the analog signal is given to two identical digitization stages, each of which is supplied with one of the two gates 1 and 2 for evaluating the corresponding mark.
  • the distance between the marks in the device according to the invention corresponds to the distance in the printed image. These distances have to be measured.
  • a third gate (measuring gate) is used, which lies above both digital marks K1, K2. These signals are supplied to measure the counter stage mentioned above, which carries out the explained immediate distance measurement.
  • the printing distance of the marks which corresponds to the target distance A, is then subtracted using suitable software.
  • the invention is thus embodied in addition to the determination device defined in the claims, also in a device for register control for multi-color printing in long-web web-fed rotary printing presses 2, which controller 1 with the central unit 22 for recording and storing all control parameters and the Has control behavior and further comprises the scanning device 24 with a plurality of scanning heads and the actuators 16, 17 and 18 for controlling the longitudinal and / or side register, with only a single path scanner T 1 , T 2 or T 3 is provided in the manner described above.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

A device for detecting registration errors between individual colours during multicolour printing in a long web-fed rotary press (2) has a scanner (24) with only one web-feeler (T1, T2, T3) per scanning head (25 to 27).

Description

Die Erfindung betrifft eine Vorrichtung zur Bestimmung des Registerfehlers zwischen den einzelnen Farben beim Mehrfarbendruck in einer Langbahn-Rollenrotationsdruckmaschine, nach dem Oberbegriff des Anspruchs 1.The invention relates to a device for determining the register error between the individual colors in multi-color printing in a long web web-fed rotary printing press, according to the preamble of claim 1.

Bei Langbahn-Rollenrotationsdruckmaschinen, die nach jedem Druckwerk eine Trocknungsvorrichtung aufweisen, wird zur Ermittlung des Registerfehlers nach jedem Druckwerk eine Passermarke auf einem neben dem eigentlichen Druckbild liegenden Streifen aufgedruckt. Nach dem zweiten Druckwerk sind mithin zwei Passermarken vorhanden, die die jeweils aufgedruckten Farben, bzw. deren Relativlage zueinander repräsentieren. Beim Vierfarbendruck sind somit nach vier Druckwerken insgesamt vier Passermarken auf dem Seitenstreifen vorhanden.In the case of long-web web-fed rotary printing presses which have a drying device after each printing unit, a registration mark is printed on a strip lying next to the actual printed image to determine the register error after each printing unit. After the second printing unit there are therefore two registration marks which represent the respectively printed colors or their relative position to one another. In four-color printing, there are a total of four registration marks on the side strip after four printing units.

Nach dem zweiten Druckwerk wird eine Erstermittlung eines etwa vorliegenden Registerfehlers vorgenommen. Hierfür sind nach einer gattungsgemäßen Vorrichtung, die beispielsweise aus der DE-C-40 37 728 oder der EP-A-0 095 437 bekannt ist, in jedem Abtastkopf zwei Bahntaster, die beispielsweise in Form faseroptischer Meßaufnehmer ausgebildet sein können, vorhanden. Bei derartigen faseroptischen Meßaufnehmern, wie sie z.B. aus dem Prospekt "Register control for gravure presses S-3100" der Firma Bobst SA bekannt sind, können die Bahntaster wegen ihrer geometrischen Abmessungen nur in einem Minimalabstand von 18 mm zueinander angeordnet werden. Hieraus folgt wiederum, daß die Passermarken in einem Minimalabstand von 20 mm zueinander angeordnet werden müssen. Bei der gattungsgemäßen Vorrichtung wird der Registerfehler durch die Meßaufnahme der Passermarken der Farben eins und zwei, zwei und drei sowie drei und vier ermittelt. Als Meßwert wird ein Zeitsignal bestimmt, das mit der jeweiligen Bahngeschwindigkeit multipliziert die Registerabweichung ergibt.After the second printing unit, any register error that may be present is first determined. For this purpose, according to a generic device, which is known, for example, from DE-C-40 37 728 or EP-A-0 095 437, there are two path sensors in each scanning head, which can be designed, for example, in the form of fiber-optic sensors. In such fiber optic sensors, such as those e.g. are known from the brochure "Register control for gravure presses S-3100" from Bobst SA, because of their geometrical dimensions, the path sensors can only be arranged at a minimum distance of 18 mm from each other. From this it follows again that the registration marks must be arranged at a minimum distance of 20 mm from one another. In the generic device, the register error is determined by measuring the registration marks of colors one and two, two and three, and three and four. A time signal is determined as the measured value, which, multiplied by the respective web speed, gives the register deviation.

Hierbei ergibt sich ein Nachteil zunächst dadurch, daß der begrenzte Platz auf dem Seitenstreifen, auf dem die Passermarken aufgedruckt sind, durch die Passermarken selbst in großem Maße beansprucht wird. Denn diese sind im 20 mm Abstand zueinander in Laufrichtung der Materialbahn aufgedruckt, so daß sich Platzprobleme für das Aufdrucken anderer Marken, die auf dem Seitenstreifen bei einigen Druckverfahren ebenfalls erforderlich sind, ergeben.A disadvantage here arises first of all from the fact that the limited space on the side strip on which the registration marks are printed is used to a large extent by the registration marks themselves. Because these are printed at a distance of 20 mm from each other in the direction of travel of the material web, so that there are space problems for the printing of other brands, which are also required on the hard shoulder in some printing processes.

Ferner ergibt sich ein Justierfehler der Lichtspots, der zu einer Abweichung des an sich vorgegebenen 20 mm Abstandes der Passermarken führt. Denn die optischen Achsen der Bahntaster können nicht so genau zueinander ausgerichtet werden, daß genau ein Abstand von 20 mm eingehalten werden kann. Da jedoch die Auswerteeinrichtung und der Regler zur Kompensierung des Registerfehlers einen Istwert von 20 mm annimmt, muß der Justierfehler durch einen Feinabgleich von Hand ausgeglichen werden. Dies ist zum einen nur von Fachpersonal auszuführen und zudem zeitaufwendig.Furthermore, there is an adjustment error of the light spots, which leads to a deviation of the 20 mm distance of the registration marks which is predetermined per se. This is because the optical axes of the path sensors cannot be aligned so precisely that a distance of 20 mm can be maintained. However, since the evaluation device and the controller assume an actual value of 20 mm to compensate for the register error, the adjustment error must be compensated by fine adjustment by hand. On the one hand, this can only be carried out by specialist personnel and is also time-consuming.

Es ist daher Aufgabe der Erfindung, eine Vorrichtung zur Bestimmung des Registerfehlers zwischen den einzelnen Farben beim Mehrfarbendruck in einer Langbahn-Rollenrotationsdruckmaschine nach dein Oberbegriff des Anspruchs 1 zu schaffen, deren Aufbau vereinfacht ist und die eine Platzeinsparung auf dem für die Anordnung der Passermarken vorgesehenen Seitenstreifen ermöglicht.It is therefore an object of the invention to provide a device for determining the register error between the individual colors in multi-color printing in a long web web-fed rotary printing press according to the preamble of claim 1, the structure of which is simplified and which saves space on the side strips provided for the arrangement of the registration marks enables.

Die Lösung dieser Aufgabe erfolgt durch die Merkmale des Anspruches 1.This object is achieved by the features of claim 1.

Mit der erfindungsgemäßen Vorrichtung ist es möglich, den Abstand zwischen den einzelnen Passer- bzw. Druckmarken auf einen Sollabstand von 3-5 mm zu minimieren. Hieraus ergibt sich eine erhebliche Platzeinsparung sowie eine Makulaturersparnis.With the device according to the invention it is possible to minimize the distance between the individual registration or printing marks to a target distance of 3-5 mm. This results in a considerable saving in space and in waste paper.

Ferner muß bei der erfindungsgemäßen Vorrichtung nur ein Bahntaster mechanisch justiert werden, wobei es grundsätzlich möglich ist, eine Abtastung auf der Walze vorzunehmen. Es kann ferner vorteilhafterweise ein Bahnflattern verhindert werden und die erfindungsgemäße Vorrichtung ist rüstzeiteinsparend.Furthermore, in the device according to the invention, only a path sensor has to be mechanically adjusted, it being possible in principle to carry out a scanning on the roller. Advantageously, web flutter can be prevented and the device according to the invention saves set-up time.

Ferner ergibt sich die Möglichkeit, eine absolute Wegvermessung des Abstandes zwischen zwei Passermarken durchzuführen, was wiederum den Vorteil ergibt, daß ein Nullabgleich nicht mehr nötig ist. Hieraus ergibt sich eine Einsparung an Rüstzeit und Makulatur. Der Sollmarkenabstand repräsentiert das Druckregister Null.Furthermore, there is the possibility of carrying out an absolute path measurement of the distance between two registration marks, which in turn gives the advantage that a zero adjustment is no longer necessary. This results in a saving in makeready time and waste. The nominal mark distance represents the print register zero.

Als weiterer Vorteil der erfindungsgemäßen Vorrichtung ist hervorzuheben, daß ein Umschalten von Stand- auf Folgeregelung, vorzugsweise auch automatisch z. B. während des Maschinenanlaufs oder bei Rollenwechsel, möglich ist. Unter einer Standmessung versteht man hierbei eine Messung, die die Registerabweichung immer auf die erste Farbe bezieht. Bei bisher bekannten Vorrichtungen ergab sich hierbei jedoch der Nachteil, daß beim Stand der Druckmaschine der Druck nicht mehr aufgebracht wird, so daß mit der Messung gewartet werden muß, bis die erste Farbe am letzten Druckwerk angekommen ist.As a further advantage of the device according to the invention it should be emphasized that switching from standstill to follow-up control, preferably also automatically for. B. during machine start-up or when changing roles. A level measurement is a measurement that the register deviation always relates to the first color. In the case of previously known devices, however, there was the disadvantage that, when the printing machine was at a standstill, the pressure was no longer applied, so that measurement had to be waited until the first color had reached the last printing unit.

Dieser Nachteil kann bei der erfindungsgemäßen Vorrichtung dadurch eliminiert werden, daß zunächst eine Folgemessung durchgeführt wird, bei der die Messung jeweils mit der vorhergehenden Farbe erfolgt. Wenn alle Farben aufgedruckt sind und am letzten Druckwerk angekommen sind, kann mit der erfindungsgemäßen Vorrichtung, vorzugsweise automatisch, auf die zuvor beschriebene Standmessung umgeschaltet werden, wodurch sich in der Folge eine Makulaturersparnis ergibt.This disadvantage can be eliminated in the device according to the invention by first carrying out a follow-up measurement in which the measurement is carried out in each case with the previous color. When all the colors have been printed and have arrived at the last printing unit, the device according to the invention can be used to switch, preferably automatically, to the previously described level measurement, which results in a saving in waste.

Bei der erfindungsgemäßen Vorrichtung, bei der die Abtastung zweier Marken lediglich mit einem einzigen faseroptischen Bahntaster erfolgt, sind die Passer-, bzw. Druckmarken hintereinander in Laufrichtung der Materialbahn angeordnet. Die Druckmarken können wie bei einem herkömmlichen Doppelbahntaster optisch abgetastet werden, in ein elektrisches Analogsignal umgewandelt und dem Registerregler zugeführt werden. Im Unterschied zur gattungsgemäßen Vorrichtung muß jedoch vorteilhafterweise lediglich ein elektrisches Signal dem Registerregler zugeführt werden.In the device according to the invention, in which two marks are scanned only with a single fiber-optic web scanner, the register or print marks are arranged one behind the other in the running direction of the material web. The print marks can be optically scanned, as with a conventional double-path scanner, converted into an electrical analog signal and fed to the register controller. In contrast to the generic device, however, advantageously only an electrical signal has to be fed to the register controller.

Obwohl die Passermarken bei der erfindungsgemäßen Vorrichtung ebenfalls in Laufrichtung des Druckbogens gesehen fluchtend hintereinander und beabstandet zueinander angeordnet sind, ergibt sich jedoch der Vorteil, daß der Markenabstand deutlich verringert werden kann, so daß die eingangs erläuterten Platzprobleme bei Verwendung der erfindungsgemäßen Vorrichtung nicht mehr auftreten.Although the registration marks in the device according to the invention are also seen in alignment in the running direction of the printed sheet, one behind the other and spaced apart However, there is the advantage that the mark spacing can be significantly reduced, so that the space problems explained at the beginning no longer occur when using the device according to the invention.

Die Unteransprüche haben vorteilhafte Weiterbildungen der Erfindung zum Inhalt.The dependent claims contain advantageous developments of the invention.

Zur Auswahl der abzutastenden und auszuwertenden Passermarken wird erfindungsgemäß von der Auswerteeinrichtung ein elektronisches Fenster gesetzt. Dieses wählt die abzutastenden Marken aus, so daß an jeder Meßstelle trotz der fluchtenden Anordnung der Passermarken und trotz des Vorhandenseins nur eines einzigen Bahntasters stets die Passermarken abgetastet und ausgewertet werden, die zur Bestimmung des jeweiligen Registerfehlers herangezogen werden müssen.According to the invention, an electronic window is set by the evaluation device to select the registration marks to be scanned and evaluated. This selects the marks to be scanned so that at each measuring point, despite the aligned arrangement of the registration marks and despite the presence of only a single path sensor, the registration marks are always scanned and evaluated, which must be used to determine the respective register error.

Mit der erfindungsgemäßen Vorrichtung wird vorteilhafterweise nach jedem Druckwerk eine Meßaufnahme durchgeführt.With the device according to the invention, a measurement recording is advantageously carried out after each printing unit.

Weitere Einzelheiten, Merkmale und Vorteile der Erfindung ergeben sich aus nachfolgender Beschreibung eines Ausführungsbeispiels anhand der Zeichnung.Further details, features and advantages of the invention result from the following description of an embodiment with reference to the drawing.

Es zeigt:

Fig. 1
eine schematisch stark vereinfachte Darstellung einer Registerregeleinrichtung zur Überwachung einer Langbahn-Rollenrotationsdruckmaschine, die eine erfindungsgemäße Bestimmungsvorrichtung umfaßt;
Fig. 2
eine stark vereinfachte schematische Darstellung eines Ausschnittes eines Druckbogens mit Passermarken und schematisch angedeuteten Bahntastern;
Fig. 3
eine der Fig. 2 entsprechende Darstellung der Anordnung der Passermarken unter Zuordnung eines schematisch stark vereinfachten Bahntasters;
Fig. 4
eine beispielhafte Darstellung eines Grafen von Signalen, die mittels der erfindungsgemäßen Vorrichtung erzeugt werden;
Fig. 5
einen Grafen zur Erläuterung eines ersten Beispiels der Signalerzeugung; und
Fig. 6
einer der Fig. 5 entsprechende Darstellung eines zweiten Beispiels zur Signalerzeugung.
It shows:
Fig. 1
a schematically greatly simplified representation of a register control device for monitoring a long web web-fed rotary printing press, which comprises a determination device according to the invention;
Fig. 2
a highly simplified schematic representation of a section of a printed sheet with registration marks and schematically indicated web buttons;
Fig. 3
a representation of the arrangement of the registration marks corresponding to FIG. 2 with assignment of a schematically greatly simplified path sensor;
Fig. 4
an exemplary representation of a graph of signals that are generated by means of the device according to the invention;
Fig. 5
a graph for explaining a first example of signal generation; and
Fig. 6
a representation corresponding to FIG. 5 of a second example for signal generation.

Gemäß der schematisch vereinfachten Darstellung der Fig. 1 ist eine Registerregelvorrichtung mit einem Regler 1 zur Überwachung einer Langbahn-Rollenrotationsdruckmaschine 2 vorgesehen, wie Sie im Prinzip aus der DE 40 37 728 C1 bekannt ist, und in der im vorliegenden Falle die erfindungsgemäße Vorrichtung integriert ist. Da sich vorliegende Erfindung sowohl in einer separaten Vorrichtung zur Bestimmung des Registerfehlers als auch in einer Regeleinrichtung, die diese erfindungsgemäße Vorrichtung gemäß den Ansprüchen vorliegender Anmeldung umfaßt, verkörpert, wird zur Ergänzung des Offenbarungsgehaltes dieser Anmeldung der vollständigen Offenbarungsgehalt der DE 40 37 728 durch Bezugnahme zum Inhalt vorliegender Anmeldung gemacht.According to the schematically simplified representation of FIG. 1, a register control device with a controller 1 is provided for monitoring a long web web-fed rotary printing press 2, as is known in principle from DE 40 37 728 C1 and in which the device according to the invention is integrated in the present case . Since the present invention is embodied both in a separate device for determining the register error and in a control device which comprises this device according to the invention in accordance with the claims of the present application, the complete disclosure content of DE 40 37 728 is supplemented by the disclosure of this application to supplement the disclosure content of this application Contents of this application made.

Die in Fig. 1 dargestellte Langbahn-Rollenrotationsdruckmaschine 2 weist im Beispielsfalle vier Druckwerke 3 bis 6 auf, in denen nacheinander die Farben gelb, rot, blau und schwarz auf eine zu bedruckende Materialbahn 7 aufgebracht werden.The long web web-fed rotary printing press 2 shown in FIG. 1 has four printing units 3 to 6 in the example, in which the colors yellow, red, blue and black are successively applied to a material web 7 to be printed.

Jedes der Druckwerke 3 bis 6 weist hierzu jeweils einen in einem Farbbad rotierenden Druckzylinder 8, 9, 10 bzw. 11 auf. Wie die Darstellung der Fig. 1 zeigt, wird die Materialbahn 7 nacheinander durch die Druckwerke 3 bis 6 hindurchgeleitet, wobei sie jeweils über die Druckzylinder 8 bis 11 geführt wird.For this purpose, each of the printing units 3 to 6 each has a printing cylinder 8, 9, 10 and 11 rotating in an ink bath. As shown in the illustration in FIG. 1, the material web 7 is passed through the printing units 3 to 6 one after the other, whereby it is guided over the printing cylinders 8 to 11, respectively.

Jedes Druckwerk der Langbahn-Rollenrotationsdruckmaschine 2 weist ferner eine Trocknungsvorrichtung 12, 13, 14 bzw. 15 auf, die in Laufrichtung der Materialbahn 7 gesehen nachfolgend zu dem zugeordneten Druckzylinder 8, 9, 10 bzw. 11 angeordnet ist. Die Trocknungsvorrichtungen 12 bis 15 können beispielsweise in Form einer Trockentrommel ausgebildet sein.Each printing unit of the long web web-fed rotary printing press 2 also has a drying device 12, 13, 14 and 15, which is arranged downstream of the assigned printing cylinder 8, 9, 10 and 11, viewed in the direction of travel of the material web 7. The drying devices 12 to 15 can be designed, for example, in the form of a drying drum.

Schließlich sind die Druckwerke 3, 4 und 5 mit einer Registerwalzenanordnung mit Stellgliedern 16, 17 bzw. 18 versehen, die jeweils einen Korrekturmotor 19, 20 bzw. 21 aufweisen.Finally, the printing units 3, 4 and 5 are provided with a register roller arrangement with actuators 16, 17 and 18, which each have a correction motor 19, 20 and 21, respectively.

Die Registerregelvorrichtung, die ein in einein nicht dargestellten Gehäuse angeordnetes Regelgerät darstellt, weist eine Zentraleinheit 22 zur Erfassung und Abspeicherung aller Regelparameter und des Regelverhaltens auf.The register control device, which represents a control device arranged in a housing (not shown), has a central unit 22 for recording and storing all control parameters and the control behavior.

Ferner weist die Registerregelvorrichtung vorzugsweise als steckbare Module ausgebildete Regeleinheiten auf, von denen in der Fig. 1 die Regeleinheit 23 dargestellt ist. Diese Regeleinheiten dienen zur Regelung des Längsregisters und/oder zur kombinierten Regelung des Längs- und Seitenregisters, und wirken zu diesem Zwecke auf die zuvor erwähnten Korrekturmotoren 19 bis 21 der jeweiligen Stellglieder 16, 17 bzw. 18.Furthermore, the register control device preferably has control units designed as plug-in modules, of which the control unit 23 is shown in FIG. 1. These control units serve to regulate the longitudinal register and / or to combine the longitudinal and lateral register, and for this purpose act on the aforementioned correction motors 19 to 21 of the respective actuators 16, 17 and 18.

Wie eingangs erläutert, ist die erfindungsgemäße Vorrichtung zur Bestimmung des Registerfehlers zwischen den einzelnen Farben bei dem in der Langbahn-Rollenrotationsdruckmaschine 2 durchgeführten Mehrfarbendruck in der in Fig. 1 verdeutlichten Gesamtanordnung integriert. Die erfindungsgemäße Vorrichtung weist eine Abtasteinrichtung 24 auf, die je Meßstelle in den Druckwerken 4, 5, bzw. 6 Abtastköpfe 25, 26 und 27 umfaßt, und die die Register- bzw. Passermarken P1 bis P4 (sh. die Fig. 2, 3) erfassen. Die Abtastköpfe 25, 26 und 27 sind hierzu an geeigneter Stelle in den Druckwerken 4, 5 bzw. 6 in Laufrichtung L der Materialbahn 7 gesehen hinter dem Druckzylinder angeordnet.As explained at the beginning, the device according to the invention for determining the register error between the individual colors in the multi-color printing carried out in the long web web-fed rotary printing press 2 is integrated in the overall arrangement illustrated in FIG. 1. The device according to the invention has a scanning device 24, which comprises each measuring point in the printing units 4, 5 or 6 scanning heads 25, 26 and 27, and which contains the register or registration marks P1 to P4 (see FIGS. 2, 3 ) to capture. The scanning heads 25, 26 and 27 are arranged at a suitable point in the printing units 4, 5 and 6 in the running direction L of the material web 7 behind the printing cylinder.

Die Abtastköpfe 25, 26 und 27 sind mit einer Signalaufnahmeeinheit der Abtasteinrichtung 24 verbunden, die wiederum die ermittelten Signale an eine mit der Zentraleinheit 22 verbundene Auswerteeinrichtung 33 weitergibt, die die Bestimmung der Relativpositionen der einzelnen Passermarken P1 bis P4 zueinander vornimmt.The scanning heads 25, 26 and 27 are connected to a signal recording unit of the scanning device 24, which in turn forwards the determined signals to an evaluation device 33 which is connected to the central unit 22 and which determines the relative positions of the individual registration marks P1 to P4 to one another.

Im Gegensatz zu bisher bekannten Vorrichtungen zur Bestimmung des Registerfehlers weist die erfindungsgemäße Vorrichtung je Abtastkopf 25 bis 27 nur einen einzigen Bahntaster auf, der in Fig. 1 mit dein Bezugszeichen T1 bzw. T2 und T3 gekennzeichnet ist.In contrast to previously known devices for determining the register error, the device according to the invention has only one single path sensor per scanning head 25 to 27, which is identified in FIG. 1 by the reference symbols T 1 or T 2 and T 3 .

Die Bahntaster T1 bis T3 sind vorzugsweise als faseroptische Bahntaster ausgebildet, die die Passermarken P1 bis P4 optisch abtasten und elektrische Analogsignale erzeugen, die der Auswerteeinrichtung 33 zugeführt werden. Die Auswerteeinrichtung 33 bestimmt anhand der zugeführten Signale die Bestimmung der Relativpositionen der Passermarken P1 bis P4 und die sich ergebenden Resultate werden über die Zentraleinheit 22 der Regeleinheit 23 zugeführt, die wiederum über Leitungen 40, 41 bzw. 42 mit den Korrekturmotoren 19, 20 bzw. 21 zur Durchführung der Registerkorrektur verbunden ist.The path sensors T 1 to T 3 are preferably designed as fiber-optic path sensors which optically scan the registration marks P1 to P4 and generate electrical analog signals which are fed to the evaluation device 33. The evaluation device 33 uses the supplied signals to determine the relative positions of the registration marks P1 to P4 and the results are fed to the control unit 23 via the central unit 22, which in turn is connected to the correction motors 19, 20 or lines 40, 41 or 42. 21 is connected to perform the register correction.

Die schematisch stark vereinfachte Darstellung der Fig. 2 zeigt einen Ausschnitt der Materialbahn 7 mit im Beispielsfalle vier Druckbildern 43, 44, 45 und 46. Den Druckbildern 43 bis 46 sind die Passermarken P1 bis P4 zugeordnet, die auf einem Seitenstreifen 47 des Druckbogens 7 beim Drucken der Druckbilder 43 bis 46 mit aufgedruckt werden. Fig. 2 verdeutlicht die Zuordnung der Bahntaster T1 bis T3 zu den Druckbildern 44, 45 bzw. 46. Es ist mithin je Meßstelle und Abtastkopf nur ein einziger Bahntaster T1, T2 bzw. T3 vorgesehen, der die jeweiligen Passermarken abtastet und die entsprechenden Signale erzeugt.2 shows a section of the material web 7 with four print images 43, 44, 45 and 46 in the example. The print images 43 to 46 are assigned the registration marks P1 to P4, which are on a side strip 47 of the print sheet 7 at Printing of print images 43 to 46 can also be printed on. Fig. 2 illustrates the assignment of Path sensors T 1 to T 3 to print images 44, 45 and 46. Accordingly, only one path sensor T 1 , T 2 and T 3 is provided for each measuring point and scanning head, which scans the respective registration marks and generates the corresponding signals.

Fig. 3 zeigt die Anordnung der Passermarken P1 und P2 und deren Abstand A zueinander. Aus dieser Darstellung wird deutlich, daß die Passermarken in Laufrichtung L der Materialbahn 7 gesehen fluchtend hintereinander angeordnet sind und entsprechend durch die jeweiligen Bahntaster T1, T2 bzw. T3 erfaßt werden. Der Abstand A kann auf 3-5 mm minimiert werden.3 shows the arrangement of the registration marks P1 and P2 and their spacing A from one another. It is clear from this illustration that the registration marks, viewed in the running direction L of the material web 7, are arranged in alignment one behind the other and are correspondingly detected by the respective web buttons T 1 , T 2 and T 3 . The distance A can be minimized to 3-5 mm.

Der Abstand A zwischen zwei Passermarken wird über einen Geber, beispielsweise die in Fig. 1 dargestellten Drehgeber 30, 31 bzw. 32 aufgelöst. Hierzu wird gemäß Fig. 4 mittels der Vorderflanke V1 eines ersten Signales S1 ein Zähler gestartet, der mit der Vorderflanke V2 des zweiten von dem jeweiligen Bahntaster aufgenommenen Signals S2 gestoppt wird. Die sich ergebende gezählte Impulszahl entspricht unmittelbar der Wegstrecke, bzw. dem Abstand A zwischen den Passermarken (z. B. 5 Impulse entspricht 5 mm Abstand A), so daß mit der erfindungsgemäßen Vorrichtung eine unmittelbare Abstandsmessung vorgenommen werden kann. Weichen die ermittelten Abstände von den zuvor bekannten Istabständen zwischen den Passermarken ab, kann die jeweilige Registerabweichung bestimmt werden.The distance A between two registration marks is resolved via a sensor, for example the rotary sensors 30, 31 and 32 shown in FIG. 1. 4, a counter is started by means of the leading edge V 1 of a first signal S1, which is stopped by the leading edge V 2 of the second signal S2 recorded by the respective path sensor. The resulting counted number of pulses corresponds directly to the distance or the distance A between the registration marks (e.g. 5 pulses corresponds to 5 mm distance A), so that an immediate distance measurement can be carried out with the device according to the invention. If the determined distances deviate from the previously known actual distances between the registration marks, the respective register deviation can be determined.

Zur weiteren Erläuterung und Offenbarung der erfindungsgemäßen Vorrichtung wird nachfolgend explizit auf Fig. 5 und 6 Bezug genommen werden.For further explanation and disclosure of the device according to the invention, reference is made explicitly to FIGS. 5 and 6 below.

Durch das Vorsehen nur eines einzigen Bahntasters T1, T2 bzw. T3 pro Abtastkopf ergibt sich ein zeitlicher Versatz der Passermarken P1 bis P4, der vom Markenabstand A abhängt.The provision of only a single path scanner T 1 , T 2 or T 3 per scanning head results in a temporal offset of the registration marks P1 to P4, which depends on the mark spacing A.

Zur Digitalisierung und Weiterverarbeitung der Marken wird jede Marke für sich digitalisiert. Dazu wird über jede Marke ein separates Tor (Tor 1, Tor 2 in Fig. 5 und 6) gelegt. Das Prinzip der Digitalisierung für jede Marke kann hierbei dem Prinzip bei Doppelbahntastern entsprechen. In der in Fig. 1 dargestellten Regeleinrichtung 1 wird das Analogsignal auf zwei identische Digitalisierungsstufen gegeben, denen jeweils eins der beiden Tore 1 bzw. 2 zur Auswertung der entsprechenden Marke zugeführt wird.Each brand is digitized for the digitization and further processing of the brands. For this purpose, a separate goal (goal 1, goal 2 in FIGS. 5 and 6) is placed over each mark. The principle of digitization for each brand can correspond to the principle for double track sensors. In the control device 1 shown in FIG. 1, the analog signal is given to two identical digitization stages, each of which is supplied with one of the two gates 1 and 2 for evaluating the corresponding mark.

Der Abstand der Marken bei der erfindungsgemäßen Vorrichtung, die pro Meßstelle nur einen einzigen Bahntaster verwendet, entspricht dem Abstand im Druckbild. Diese Abstände müssen vermessen werden. Hierzu wird ein drittes Tor (Meßtor) verwendet, das über beiden Digitalmarken K1, K2 liegt. Diese Signale werden zur Vermessung der zuvor erwähnten Zählerstufe zugeführt, die die erläuterte unmittelbare Abstandsmessung durchführt.The distance between the marks in the device according to the invention, which uses only a single path sensor per measuring point, corresponds to the distance in the printed image. These distances have to be measured. For this purpose, a third gate (measuring gate) is used, which lies above both digital marks K1, K2. These signals are supplied to measure the counter stage mentioned above, which carries out the explained immediate distance measurement.

Der Druckabstand der Marken, der dem Sollabstand A entspricht, wird danach durch eine geeignete Software abgezogen.The printing distance of the marks, which corresponds to the target distance A, is then subtracted using suitable software.

Gemäß Fig. 6 ist es ferner möglich, den Abstand der Passermarken prinzipiell variabel einzugeben, d. h., daß zwischen den abzutastenden Marken auch eine dritte oder mehrere weitere Marken liegen können. Dadurch wird vorzugsweise eine Umschaltung des Meßverfahrens (Stand- oder Folgeregelung) oder unterschiedlicher Markenanordnungen möglich.6, it is also possible in principle to enter the distance between the registration marks variably, i. that is, between the marks to be scanned there can also be a third or more further marks. This preferably makes it possible to switch over the measuring method (stand or follow-up control) or different mark arrangements.

Mit der erfindungsgemäßen Bestimmungsvorrichtung, bzw. einer mit dieser versehenen Registerregelungsvorrichtung ist es vorzugsweise möglich, Regelungen nach dem Bahn/Bahn- oder dem Bahn/Zylinderverfahren durchzuführen.With the determination device according to the invention, or a register control device provided with it, it is preferably possible to carry out controls according to the path / path or the path / cylinder method.

Wie eingangs der Figurenbeschreibung erläutert wird, verkörpert sich die Erfindung somit neben der in den Ansprüchen definierten Bestimmungsvorrichtung auch in einer Vorrichtung zur Registerregelung für den Mehrfarbendruck in Langbahn-Rollenrotationsdruckmaschinen 2, die den Regler 1 mit der Zentraleinheit 22 zur Erfassung und Abspeicherung aller Regelparameter und des Regelverhaltens aufweist und ferner die Abtasteinrichtung 24 mit einer Mehrzahl von Abtastköpfen und die Stellglieder 16, 17 und 18 zur Regelung des Längs- und/oder Seitenregisters aufweist, wobei je Meßstelle und Abtastkopf 25 bis 27 nur ein einziger Bahntaster T1, T2 bzw. T3 in der zuvor beschriebenen Art und Weise vorgesehen ist.As explained at the beginning of the description of the figures, the invention is thus embodied in addition to the determination device defined in the claims, also in a device for register control for multi-color printing in long-web web-fed rotary printing presses 2, which controller 1 with the central unit 22 for recording and storing all control parameters and the Has control behavior and further comprises the scanning device 24 with a plurality of scanning heads and the actuators 16, 17 and 18 for controlling the longitudinal and / or side register, with only a single path scanner T 1 , T 2 or T 3 is provided in the manner described above.

Claims (3)

  1. A device for detecting the registration error between the individual colours during multicolour printing in a long web-fed rotary press
    - having a scanning device (24), which for each measurement point comprises a fibre-optic scanning head (25 to 27) for register marks (P1 to P4) printed in different colours on a web of material (7),
    - having an evaluation device (33) interacting with the scanning device (24) for determining the relative positions of the individual register marks (P1 to P4),
    characterised
    - in that each scanning head (25 to 27) comprises only one single fibre-optic web scanner (T1, T2, T3) for the register marks (P1 to P4) which are disposed in alignment behind one another and spaced from one another when seen in the direction of movement (L) of the web of material (7),
    - in that by means of a rising edge (V1) of a first signal (S1) produced by the respective web scanner (T1, T2, T3) a counter is started, which is stopped with the rising edge (V2) of a second signal (S2) produced by the respective web scanner (T1, T2, T3), with the counter counting pulses produced by a transmitter (30, 31 and 32 respectively) in the time ( t) between start and stop, the sum of which corresponds to the spacing (A) of the register marks (P1 to P4).
  2. A device according to Claim 1,
    characterised in that to select the register marks (P1 to P4) to be scanned and evaluated by the evaluation device (33) an electronic window is set.
  3. A device according to one of Claims 1 or 2,
    characterised by a changeover device for changing over between follow-up and fixed measurement.
EP94905086A 1993-01-19 1994-01-19 Device for detecting registration errors between individual colours during multicolour printing in a long web-fed rotary press Expired - Lifetime EP0637286B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4301272 1993-01-19
DE19934301272 DE4301272A1 (en) 1993-01-19 1993-01-19 Device for determining the register error between the individual colors in multi-color printing in a long web web-fed rotary printing press
PCT/EP1994/000123 WO1994016893A1 (en) 1993-01-19 1994-01-19 Device for detecting registration errors between individual colours during multicolour printing in a long web-fed rotary press

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EP0637286A1 EP0637286A1 (en) 1995-02-08
EP0637286B1 true EP0637286B1 (en) 1997-07-23

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DE (2) DE4301272A1 (en)
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WO2019121144A1 (en) 2017-12-22 2019-06-27 Leonhard Kurz Stiftung & Co. Kg Method and device, in particular for sensing position markings on a substrate

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DE102006060212B4 (en) * 2006-12-18 2013-07-11 Windmöller & Hölscher Kg Printing machine for printing substrate webs and method for setting and maintaining the register of such a printing press
DE102007049192B4 (en) 2007-10-13 2011-12-29 Windmöller & Hölscher Kg Device and method for transporting a printed material web
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DE102008059584A1 (en) 2008-11-28 2010-06-02 Eltromat Gmbh Method and device for controlling the register in a printing machine
US8539883B2 (en) 2008-11-28 2013-09-24 Eltromat Gmbh Method and apparatus for regulating the register in a printing press
DE102008059584B4 (en) 2008-11-28 2021-11-18 BST eltromat International GmbH Method and device for regulating the register in a printing press
WO2019121144A1 (en) 2017-12-22 2019-06-27 Leonhard Kurz Stiftung & Co. Kg Method and device, in particular for sensing position markings on a substrate

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JPH07505100A (en) 1995-06-08
DE59403438D1 (en) 1997-08-28
WO1994016893A1 (en) 1994-08-04
ES2106506T3 (en) 1997-11-01
EP0637286A1 (en) 1995-02-08
JP3454823B2 (en) 2003-10-06
DE4301272A1 (en) 1994-07-21

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