EP0637286A1 - 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.

Info

Publication number
EP0637286A1
EP0637286A1 EP94905086A EP94905086A EP0637286A1 EP 0637286 A1 EP0637286 A1 EP 0637286A1 EP 94905086 A EP94905086 A EP 94905086A EP 94905086 A EP94905086 A EP 94905086A EP 0637286 A1 EP0637286 A1 EP 0637286A1
Authority
EP
European Patent Office
Prior art keywords
printing
web
registration marks
fed rotary
register
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.)
Granted
Application number
EP94905086A
Other languages
German (de)
French (fr)
Other versions
EP0637286B1 (en
Inventor
Hans W Wehmeier
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.)
ELTROMAT GESELLSCHAFT fur INDUSTRIE-ELEKTRONIK MBH
ELTROMAT GES fur IND ELEKTRONI
Original Assignee
ELTROMAT GESELLSCHAFT fur INDUSTRIE-ELEKTRONIK MBH
ELTROMAT GES fur IND ELEKTRONI
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 ELTROMAT GESELLSCHAFT fur INDUSTRIE-ELEKTRONIK MBH, ELTROMAT GES fur IND ELEKTRONI filed Critical ELTROMAT GESELLSCHAFT fur INDUSTRIE-ELEKTRONIK MBH
Publication of EP0637286A1 publication Critical patent/EP0637286A1/en
Application granted granted Critical
Publication of EP0637286B1 publication Critical patent/EP0637286B1/en
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
    • 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 40 37 728, there are two path probes in each scanning head, which can be designed, for example, in the form of fiber-optic sensors.
  • the path sensors can only be arranged at a minimum distance of 18 mm from one another due to their geometric dimensions. 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 the 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, results in the register deviation.
  • the device according to the invention only one path sensor has to be mechanically adjusted, it being possible in principle to carry out a scanning on the roller. Furthermore, web flutter can advantageously 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, preferably automatically, to switch over to the previously described level measurement, which results in a reduction in waste.
  • the registration or printing marks are arranged one behind the other in the running direction of the printing sheet.
  • the print marks can be optically scanned, as in a conventional double web 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.
  • the path sensors are preferably designed as fiber-optic path sensors.
  • 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 from one another.
  • 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.
  • 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 the register marks which must be used to determine the respective register error are always scanned and evaluated at each measuring point, despite the aligned arrangement of the registration marks and despite the presence of only a single path sensor.
  • FIG. 1 shows 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 shows a greatly simplified schematic illustration of a section of a printed sheet with registration marks and schematically indicated web buttons
  • FIG. 3 shows a representation corresponding to FIG. 2 of the arrangement of the registration marks with the assignment of a schematically greatly simplified path scanner; 4 shows an exemplary representation of a graph of signals which are generated by means of the device according to the invention;
  • FIG. 6 shows a representation corresponding to FIG. 5 of a second example for signal generation.
  • 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 the present case the invention according to the invention according device is integrated. Since the present invention is embodied both in a separate device for determining the register error and in a regulating device which comprises this device according to the application as claimed, the complete disclosure content of DE 40 37 is added to the disclosure content of this application 728 made by reference to the content of the present application.
  • 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 7 to be printed in the form of a running printing sheet.
  • 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, in each case being guided over the printing cylinders 8 to 11.
  • Each printing unit of the long-web web-fed rotary printing press 2 also has a drying device 12, 13, 14 and 15, which, viewed in the direction of travel of the material web 7, is arranged subsequently to the associated printing cylinder 8, 9, 10 and 11, respectively.
  • 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, each of which has 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 control the longitudinal register and / or to combine the longitudinal and lateral register, and for this purpose act on the previously mentioned 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 FIG. 2 , 3) 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 web material 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 with respect to one another makes.
  • 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 web scanners T- to T 3 are preferably designed as fiber-optic web scanners 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 via lines 40, 41 and 42 , 20 and 21 is connected to perform the register correction.
  • FIG. 2 shows a section of the material web or the printing sheet 7 with four print images 43, 44, 45 and 46 in the example.
  • the registration marks P 1 to P 4 are assigned to the print images 43 to 46 a side strip 47 of the printed sheet 7 are also printed when printing the printed images 43 to 46.
  • Fig. 2 illustrates the assignment of Path scanner T- ⁇ to T 3 to the print images 44, 45 and 46. There is therefore only a single path sensor T lf T 2 and T 3 is provided per 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 Pl and P2 and their distance A to each other. It is clear from this illustration that the registration marks, viewed in the running direction L of the printing sheet 7, are arranged in alignment one behind the other and are correspondingly detected by the respective web buttons 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.
  • a counter is started by means of the leading edge V ⁇ of a first signal S1, which counter is stopped with the leading edge V 2 of the second signal S2 picked up by the respective path sensor.
  • the resulting counted number of pulses corresponds directly to the distance, or the distance A between the register 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.
  • 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 over both digital marks K1, K2. These signals are supplied for measuring the previously mentioned counter stage 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 multicolor printing in long-web web-fed rotary printing presses 2, which controls 1 with the central unit 22 for recording and storing all re ⁇ gel parameters and the control behavior and further comprises the scanning device 24 with a plurality of scanning heads and the actuators 16, 17 and 18 for regulating the longitudinal and / or lateral register, with only one single path scanner ⁇ for each measuring point and scanning head 25 to 27 , T and T 3 is provided in the manner described above.

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

Vorrichtung zur Bestimmung des Registerfehlers zwischen den einzelnen Farben beim Mehrfarbendruck in einer Langbahn-Rol¬ lenrotationsdruckmaschineDevice for determining the register error between the individual colors in multi-color printing in a long-web web-fed rotary printing press
Beschreibungdescription
Die Erfindung betrifft eine Vorrichtung zur Bestimmung des Registerfehlers zwischen den einzelnen Farben beim Mehrfar¬ bendruck in einer Langbahn-Rollenrotationsdruckmaschine, nac- 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 Er¬ mittlung des Registerfehlers nach jedem Druckwerk eine Pas¬ sermarke auf einem neben dem eigentlichen Druckbild liegen¬ den Streifen aufgedruckt. Nach dem zweiten Druckwerk sind mithin zwei Passermarken vorhanden, die die jeweils aufge¬ druckten Farben, bzw. deren Relativlage zueinander repräsen¬ tieren. Beim Vierfarbendruck sind somit nach vier Druckwer¬ ken insgesamt vier Passermarken auf dem Seitenstreifen vor¬ handen. Nach dem zweiten Druckwerk wird eine Erstermittlung eines etwa vorliegenden Registerfehlers vorgenommen. Hierfür sind nach einer gattungsgemäßen Vorrichtung, die beispielsweise aus der DE 40 37 728 bekannt ist, in jedem Abtastkopf zwei Bahntaster, die beispielsweise in Form faseroptischer Me߬ aufnehmer ausgebildet sein können, vorhanden. Bei faserop¬ tischen Meßaufnehmern können die Bahntaster wegen ihrer geo¬ metrischen Abmessungen nur in einem Minimalabstand von 18 mm zueinander angeordnet werden. Hieraus folgt wiederum, daß die Passermarken in einem Minimalabstand von 20 mm zueinan¬ der angeordnet werden müssen. Bei der gattungsgemäßen Vor¬ richtung 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 be¬ stimmt, das mit der jeweiligen Bahngeschwindigkeit multipli¬ ziert die Registerabweichung ergibt.In the case of long web web-fed rotary printing presses which have a drying device after each printing unit, a register mark is printed on each 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, a total of four registration marks are thus present on the side strip after four printing works. 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 40 37 728, there are two path probes in each scanning head, which can be designed, for example, in the form of fiber-optic sensors. In the case of fiber-optic sensors, the path sensors can only be arranged at a minimum distance of 18 mm from one another due to their geometric dimensions. 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 the 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, results in the register deviation.
Hierbei ergibt sich ein Nachteil zunächst dadurch, daß der begrenzte Platz auf dem Seitenstreifen, auf dem die Passer¬ marken aufgedruckt sind, durch die Passermarken selbst in großem Maße beansprucht wird. Denn diese sind im 20 mm Ab¬ stand zueinander in Laufrichtung des Druckbogens aufge¬ druckt, so daß sich Platzprobleme für das Aufdrucken anderer Marken, die auf dem Seitenstreifen bei einigen Druckverfah¬ ren 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 great extent by the registration marks themselves. This is because these are printed at a distance of 20 mm from one another in the running direction of the printing sheet, so that there are space problems for printing other brands, which are also necessary on the side strip 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 Bahn¬ taster 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 Kompensie¬ rung des Registerfehlers einen Istwert von 20 mm annimmt, muß der Justierfehler durch einen Feinabgleich von Hand aus¬ geglichen werden. Dies ist zum einen nur von Fachpersonal auszuführen und zudem zeitaufwendig. Es ist daher Aufgabe der Erfindung, eine Vorrichtung zur Be¬ stimmung des Registerfehlers zwischen den einzelnen Farben beim Mehrfarbendruck in einer Langbahn-Rollenrotationsdruck¬ maschine nach dem Oberbegriff des Anspruchs 1 zu schaffen, deren Aufbau vereinfacht ist und die eine Platzeinsparung auf dem für die Anordnung der Passermarken vorgesehenen Sei¬ tenstreifen ermöglicht.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 with one another so precisely that a distance of exactly 20 mm can be maintained. However, since the evaluation device and the controller for compensating the register error assume an actual value of 20 mm, the adjustment error must be compensated for by manual fine adjustment. On the one hand, this can only be carried out by specialist personnel and is also time-consuming. 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, the structure of which is simplified and which saves space on that for the arrangement of the side strips provided for the registration marks.
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 Makulaturer¬ sparnis.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 a saving in waste.
Ferner muß bei der erfindungsgemäßen Vorrichtung nur ein Bahntaster mechanisch justiert werden, wobei es grundsätz¬ lich möglich ist, eine Abtastung auf der Walze vorzunehmen. Es kann ferner vorteilhafterweise ein Bahnflattern verhin¬ dert werden und die erfindungsgemäße Vorrichtung ist rüst¬ zeiteinsparend.Furthermore, in the device according to the invention, only one path sensor has to be mechanically adjusted, it being possible in principle to carry out a scanning on the roller. Furthermore, web flutter can advantageously be prevented and the device according to the invention saves set-up time.
Ferner ergibt sich die Möglichkeit, eine absolute Wegvermes¬ sung des Abstandes zwischen zwei Passermarken durchzuführen, was wiederum den Vorteil ergibt, daß ein Nullabgleich nicht mehr nötig ist. Hieraus ergibt sich eine Einsparung an Rüst¬ zeit 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 has 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 Folgerege¬ lung, vorzugsweise auch automatisch z. B. während des Ma¬ schinenanlaufs 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 ange¬ kommen 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 devices known hitherto, 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 erfindungεgemäßen Vorrichtung dadurch eliminiert werden, daß zunächst eine Folgemessung durchgeführt wird, bei der die Messung jeweils mit der vor¬ hergehenden Farbe erfolgt. Wenn alle Farben aufgedruckt sind und am letzten Druckwerk angekommen sind, kann mit der er¬ findungsgemäßen Vorrichtung, vorzugsweise automatisch, auf die zuvor beschriebene Standmessung umgeschaltet werden, wo¬ durch 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 in each case carried out with the preceding 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, preferably automatically, to switch over to the previously described level measurement, which results in a reduction in waste.
Bei der erfindungsgemäßen Vorrichtung, bei der die Abtastung zweier Marken lediglich mit einem einzigen Bahntaster er¬ folgt, sind die Passer-, bzw. Druckmarken hintereinander in Laufrichtung des Druckbogens angeordnet. Die Druckmarken können wie bei einem herkömmlichen Doppelbahntaster optisch abgetastet werden, in ein elektrisches Analogsignal umgewan¬ delt und dem Registerregler zugeführt werden. Im Unterschied zur gattungsgemäßen Vorrichtung muß jedoch vorteilhafterwei¬ se lediglich ein elektrisches Signal dem Registerregler zu¬ geführt werden.In the device according to the invention, in which two marks are scanned only with a single web scanner, the registration or printing marks are arranged one behind the other in the running direction of the printing sheet. The print marks can be optically scanned, as in a conventional double web scanner, converted into an electrical analog signal and fed to the register controller. In contrast to the device of the generic type, however, advantageously only an electrical signal has to be fed to the register controller.
Die Unteransprüche haben vorteilhafte Weiterbildungen der Erfindung zum Inhalt.The dependent claims contain advantageous developments of the invention.
Vorzugsweise sind die Bahntaster als faseroptische Bahnta¬ ster ausgebildet.The path sensors are preferably designed as fiber-optic path sensors.
Obwohl die Passermarken bei der erfindungsgemäßen Vorrich¬ tung ebenfalls in Laufrichtung des Druckbogens gesehen fluchtend hintereinander und beabstandet zueinander angeord- net sind, ergibt sich jedoch der Vorteil, daß der Markenab¬ stand deutlich verringert werden kann, so daß die eingangs erläuterten Platzprobleme bei Verwendung der erfindungsge¬ mäßen 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 from one another. 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.
Zur Auswahl der abzutastenden und auszuwertenden Passermar¬ ken wird erfindungsgemäß von der Auswerteeinrichtung ein elektronisches Fenster gesetzt. Dieses wählt die abzutasten¬ den Marken aus, so daß an jeder Meßstelle trotz der fluch¬ tenden Anordnung der Passermarken und trotz des Vorhanden¬ seins 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 the register marks which must be used to determine the respective register error are always scanned and evaluated at each measuring point, despite the aligned arrangement of the registration marks and despite the presence of only a single path sensor.
Mit der erfindungsgemäßen Vorrichtung wird vorteilhafterwei¬ se 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 Ausfüh¬ rungsbeispiels anhand der Zeichnung.Further details, features and advantages of the invention result from the following description of an exemplary embodiment with reference to the drawing.
Es zeigt:It shows:
Fig. 1 eine schematisch stark vereinfachte Darstellung einer Registerregeleinrichtung zur Überwachung einer Langbahn-Rollenrotationsdruckmaschine, die eine er¬ findungsgemäße Bestimmungsvorrichtung umfaßt;1 shows 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 eine stark vereinfachte schematische Darstellung eines Ausschnittes eines Druckbogens mit Passermar¬ ken und schematisch angedeuteten Bahntastern;2 shows a greatly simplified schematic illustration of a section of a printed sheet with registration marks and schematically indicated web buttons;
Fig. 3 eine der Fig. 2 entsprechende Darstellung der Anord¬ nung der Passermarken unter Zuordnung eines schema¬ tisch stark vereinfachten Bahntasters; Fig. 4 eine beispielhafte Darstellung eines Grafen von Sig¬ nalen, die mittels der erfindungsgemäßen Vorrichtung erzeugt werden;3 shows a representation corresponding to FIG. 2 of the arrangement of the registration marks with the assignment of a schematically greatly simplified path scanner; 4 shows an exemplary representation of a graph of signals which are generated by means of the device according to the invention;
Fig. 5 einen Grafen zur Erläuterung eines ersten Beispiels der Signalerzeugung; und5 is a graph for explaining a first example of signal generation; and
Fig. 6 einer der Fig. 5 entsprechende Darstellung eines zweiten Beispiels zur Signalerzeugung.FIG. 6 shows 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 Cl be¬ kannt ist, und in der im vorliegenden Falle die erfindungs¬ gemäße Vorrichtung integriert ist. Da sich vorliegende Er¬ findung sowohl in einer separaten Vorrichtung zur Bestimmung des Registerfehlers als auch in einer Regeleinrichtung, die diese erfindungsgemäße Vorrichtung gemäß den Ansprüchen vor¬ liegender 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 illustration in 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 the present case the invention according to the invention according device is integrated. Since the present invention is embodied both in a separate device for determining the register error and in a regulating device which comprises this device according to the application as claimed, the complete disclosure content of DE 40 37 is added to the disclosure content of this application 728 made by reference to the content of the present application.
Die in Fig. 1 dargestellte Langbahn-Rollenrotationsdruckma¬ schine 2 weist im Beispielsfalle vier Druckwerke 3 bis 6 auf, in denen nacheinander die Farben gelb, rot, blau und schwarz auf ein zu bedruckendes Material 7 in Form eines laufenden Druckbogens 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 7 to be printed in the form of a running printing sheet.
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 Mate¬ rialbahn 7 nacheinander durch die Druckwerke 3 bis 6 hin¬ durchgeleitet, wobei sie jeweils über die Druckzylinder 8 bis 11 geführt wird. Jedes Druckwerk der Langbahn-Rollenrotationsdruckmaschine 2 weist ferner eine Trocknungsvorrichtung 12, 13, 14 bzw. 15 auf, die in Laufrichtung der Materialbahn 7 gesehen nachfol¬ gend zu dem zugeordneten Druckzylinder 8, 9, 10 bzw. 11 an¬ geordnet ist. Die Trocknύngsvorrichtungen 12 bis 15 können beispielsweise in Form einer Trockentrommel ausgebildet sein.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 FIG. 1, the material web 7 is passed through the printing units 3 to 6 one after the other, in each case being guided over the printing cylinders 8 to 11. Each printing unit of the long-web web-fed rotary printing press 2 also has a drying device 12, 13, 14 and 15, which, viewed in the direction of travel of the material web 7, is arranged subsequently to the associated printing cylinder 8, 9, 10 and 11, respectively. 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 Regi¬ sterwalzenanordnung mit Stellgliedern 16, 17 bzw. 18 verse¬ hen, die jeweils einen Korrekturmotor 19, 20 bzw. 21 auf¬ weisen.Finally, the printing units 3, 4 and 5 are provided with a register roller arrangement with actuators 16, 17 and 18, each of which has a correction motor 19, 20 and 21 respectively.
Die Registerregelvorrichtung, die ein in einem nicht darge¬ stellten 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 Seitenre¬ gisters, 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 control the longitudinal register and / or to combine the longitudinal and lateral register, and for this purpose act on the previously mentioned 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 verdeut¬ lichten Gesamtanordnung integriert. Die erfindungsgemäße Vorrichtung weist eine Abtasteinrichtung 24 auf, die je Me߬ stelle in den Druckwerken 4, 5, bzw. 6 Abtastköpfe 25, 26 und 27 umfaßt, und die die Register- bzw. Passermarken Pl 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 des Bahnmaterials 7 gesehen hinter dem Druckzylinder angeordnet.As explained at the outset, 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 FIG. 2 , 3) 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 web material 7 behind the printing cylinder.
Die Abtastköpfe 25, 26 und 27 sind mit einer Signalaufnahme¬ einheit der Abtasteinrichtung 24 verbunden, die wiederum die ermittelten Signale an eine mit der Zentraleinheit 22 ver¬ bundene Auswerteeinrichtung 33 weitergibt, die die Bestim¬ mung der Relativpositionen der einzelnen Passermarken Pl 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 with respect to one another makes.
Im Gegensatz zu bisher bekannten Vorrichtungen zur Bestim¬ mung des Registerfehlers weist die erfindungsgemäße Vorrich¬ tung je Abtastkopf 25 bis 27 nur einen einzigen Bahntaster auf, der in Fig. 1 mit dem Bezugszeichen T^ 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 T- bis T3 sind vorzugsweise als faseroptische Bahntaster ausgebildet, die die Passermarken Pl bis P4 op¬ tisch abtasten und elektrische Analogsignale erzeugen, die der Auswerteeinrichtung 33 zugeführt werden. Die Auswerte¬ einrichtung 33 bestimmt anhand der zugeführten Signale die Bestimmung der Relativpositionen der Passermarken Pl bis P4 und die sich ergebenden Resultate werden über die Zentral¬ einheit 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 web scanners T- to T 3 are preferably designed as fiber-optic web scanners 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 via lines 40, 41 and 42 , 20 and 21 is connected to perform the register correction.
Die schematisch stark vereinfachte Darstellung der Fig. 2 zeigt einen Ausschnitt der Materialbahn, bzw. des Druckbo¬ gens 7 mit im Beispielsfalle vier Druckbildern 43, 44, 45 und 46. Den Druckbildern 43 bis 46 sind die Passermarken Pl 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 T-^ bis T3 zu den Druckbildern 44, 45 bzw. 46. Es ist mithin je Meßstelle und Abtastkopf nur ein einziger Bahntaster Tlf T2 bzw. T3 vorgesehen, der die jeweiligen Passermarken abtastet und die entsprechenden Signale erzeugt.The schematically highly simplified representation of FIG. 2 shows a section of the material web or the printing sheet 7 with four print images 43, 44, 45 and 46 in the example. The registration marks P 1 to P 4 are assigned to the print images 43 to 46 a side strip 47 of the printed sheet 7 are also printed when printing the printed images 43 to 46. Fig. 2 illustrates the assignment of Path scanner T- ^ to T 3 to the print images 44, 45 and 46. There is therefore only a single path sensor T lf T 2 and T 3 is provided per measuring point and scanning head, which scans the respective registration marks and generates the corresponding signals.
Fig. 3 zeigt die Anordnung der Passermarken Pl und P2 und deren Abstand A zueinander. Aus dieser Darstellung wird deutlich, daß die Passermarken in Laufrichtung L des Druck¬ bogens 7 gesehen fluchtend hintereinander angeordnet sind und entsprechend durch die jeweiligen Bahntaster 1^ , T2 bzw. T3 erfaßt werden. Der Abstand A kann auf 3-5 mm minimiert werden.Fig. 3 shows the arrangement of the registration marks Pl and P2 and their distance A to each other. It is clear from this illustration that the registration marks, viewed in the running direction L of the printing sheet 7, are arranged in alignment one behind the other and are correspondingly detected by the respective web buttons 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 V^ eines ersten Signales Sl ein Zähler ge¬ startet, der mit der Vorderflanke V2 des zweiten von dem je¬ weiligen Bahntaster aufgenommenen Signals S2 gestoppt wird. Die sich ergebende gezählte Impulszahl entspricht unmittel¬ bar der Wegstrecke, bzw. dem Abstand A zwischen den Passer¬ marken (z. B. 5 Impulse entspricht 5 mm Abstand A) , so daß mit der erfindungsgemäßen Vorrichtung eine unmittelbare Abstandsmessung vorgenommen werden kann. Weichen die ermit¬ telten Abstände von den zuvor bekannten Istabständen zwi¬ schen den Passermarken ab, kann die jeweilige Registerabwei¬ chung 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. For this purpose, according to FIG. 4, a counter is started by means of the leading edge V ^ of a first signal S1, which counter is stopped with the leading edge V 2 of the second signal S2 picked up by the respective path sensor. The resulting counted number of pulses corresponds directly to the distance, or the distance A between the register 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 erfindungsge¬ mäßen 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 Tlf T2 bzw. T3 pro Abtastkopf ergibt sich ein zeitlicher Versatz der Passermarken Pl bis P4, der vom Markenabstand A abhängt. 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 je¬ weils eins der beiden Tore 1 bzw. 2 zur Auswertung der ent¬ sprechenden Marke zugeführt wird.The provision of only a single path scanner T lf T 2 or T 3 per scanning head results in a temporal offset of the registration marks Pl to P4, which depends on the mark spacing A. 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 Vorrich¬ tung, die pro Meßstelle nur einen einzigen Bahntaster ver¬ wendet, entspricht dem Abstand im Druckbild. Diese Abstände müssen vermessen werden. Hierzu wird ein drittes Tor (Me߬ tor) verwendet, das über beiden Digitalmarken Kl, K2 liegt. Diese Signale werden zur Vermessung der zuvor erwähnten Zäh¬ lerstufe zugeführt, die die erläuterte unmittelbare Ab- standsmessung 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 over both digital marks K1, K2. These signals are supplied for measuring the previously mentioned counter stage which carries out the explained immediate distance measurement.
Der Druckabstand der Marken, der dem Sollabstand A ent¬ spricht, wird danach durch eine geeignete Software abgezo¬ gen.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 Passer¬ marken prinzipiell variabel einzugeben, d. h. , daß zwischen den abzutastenden Marken auch eine dritte oder mehrere wei¬ tere Marken liegen können. Dadurch wird vorzugsweise eine Umschaltung des Meßverfahrens (Stand- oder Folgeregelung) oder unterschiedlicher Markenanordnungen möglich.According to FIG. 6, it is also possible, in principle, to enter the distance between the registration marks variably, ie. H. that 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. Wie eingangs der Figurenbeschreibung erläutert wird, verkör¬ pert 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 Re¬ gelparameter 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 Ab- tastkopf 25 bis 27 nur ein einziger Bahntaster ^, T bzw. T3 in der zuvor beschriebenen Art und Weise vorgesehen ist. 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. As will be 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 multicolor printing in long-web web-fed rotary printing presses 2, which controls 1 with the central unit 22 for recording and storing all re ¬ gel parameters and the control behavior and further comprises the scanning device 24 with a plurality of scanning heads and the actuators 16, 17 and 18 for regulating the longitudinal and / or lateral register, with only one single path scanner ^ for each measuring point and scanning head 25 to 27 , T and T 3 is provided in the manner described above.

Claims

Patentansprüche Claims
1. Vorrichtung zur Bestimmung des Registerfehlers zwischen den einzelnen Farben beim Mehrfarbendruck in einer Lang¬ bahn-Rollenrotationsdruckmaschine1. Device for determining the register error between the individual colors in multi-color printing in a long web web-fed rotary printing press
- mit einer Abtasteinrichtung (24) , die je Meßstelle einen Abtastkopf (25 bis 27) für verschiedenfarbig mitgedruckte Passermarken (Pl bis P4) auf einem Druck¬ bogen (7) aufweist und- With a scanning device (24), which has a scanning head (25 to 27) for each measuring point for differently printed registration marks (Pl to P4) on a printing sheet (7) and
- mit einer mit der Abtasteinrichtung (24) zusammenwir¬ kenden Auswerteeinrichtung (33) zur Bestimmung der Re¬ lativpositionen der einzelnen Passermarken (Pl bis P4) , dadurch gekennzeichnet,with an evaluation device (33), which interacts with the scanning device (24), for determining the relative positions of the individual registration marks (Pl to P4), characterized in that
- daß jeder Abtastkopf (25 bis 27) zur einen einzigen Bahntaster (Tlf T2, T3) aufweist.- That each scanning head (25 to 27) has a single path scanner (T lf T 2 , T 3 ).
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Bahntaster (Tlf T2, T3) als faseroptische Bahntaster ausgebildet sind2. Device according to claim 1, characterized in that the path sensors (T lf T 2 , T 3 ) are designed as fiber-optic path sensors
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeich¬ net, daß die Passermarken (Pl bis P4) in Laufrichtung (L) des Druckbogens (7) fluchtend hintereinander und beabstandet zueinander angeordnet sind.3. Apparatus according to claim 1 or 2, characterized gekennzeich¬ net that the registration marks (Pl to P4) in the running direction (L) of the printing sheet (7) are arranged one behind the other and spaced apart.
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß zur Auswahl der abzutastenden und auszuwertenden Passermarken (Pl bis P4) von der Auswer¬ teeinrichtung (33) ein elektronisches Fenster gesetzt wird. 4. Device according to one of claims 1 to 3, characterized in that an electronic window is set for the selection of the registration marks to be scanned and evaluated (Pl to P4) by the evaluation device (33).
5. Vorrichtung nach einem der Ansprüche l bis 4, gekenn¬ zeichnet durch eine Umschaltvorrichtung zur Umschaltung zwischen Folge- und Standmessung. 5. Device according to one of claims 1 to 4, marked by a switching device for switching between follow-up and level 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 true EP0637286A1 (en) 1995-02-08
EP0637286B1 EP0637286B1 (en) 1997-07-23

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WO1994016893A1 (en) 1994-08-04
EP0637286B1 (en) 1997-07-23
DE4301272A1 (en) 1994-07-21
JP3454823B2 (en) 2003-10-06
JPH07505100A (en) 1995-06-08
ES2106506T3 (en) 1997-11-01
DE59403438D1 (en) 1997-08-28

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