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EP0031881B1 - Device for the opto-electronic zonal measurement of the area coverage of a printing sheet - Google Patents

Device for the opto-electronic zonal measurement of the area coverage of a printing sheet Download PDF

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Publication number
EP0031881B1
EP0031881B1 EP80106733A EP80106733A EP0031881B1 EP 0031881 B1 EP0031881 B1 EP 0031881B1 EP 80106733 A EP80106733 A EP 80106733A EP 80106733 A EP80106733 A EP 80106733A EP 0031881 B1 EP0031881 B1 EP 0031881B1
Authority
EP
European Patent Office
Prior art keywords
elements
master
pick
transport direction
offset printing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP80106733A
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German (de)
French (fr)
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EP0031881A1 (en
Inventor
Hans E. Mamberer
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.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
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Filing date
Publication date
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Publication of EP0031881A1 publication Critical patent/EP0031881A1/en
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Expired legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply

Definitions

  • the invention relates to a device for zone-by-zone opto-electronic measurement of the area coverage of an offset printing plate or a printing template serving for the production of offset printing plates, the brightness distribution of which can be detected by a plurality of recording elements arranged transversely to the transport direction of the printing template and can be supplied to a circuit for generating signals for setting ink fountain keys is.
  • a prerequisite for the device specified at the outset is that the measuring zone defined by the receiving elements has the same width as the ink zone width of the printing press in which the signals derived from the brightness distribution of the original to be scanned are to be used to adjust the ink zone screws.
  • the pickups arranged transversely to the transport direction of the film to be scanned are therefore dimensioned such that the zone detected by a pickup has a width which is identical to the constructionally determined ink zone width of the printing press, in which the artwork to be scanned is to be reproduced.
  • the disadvantage of the previously known scanning devices according to the type specified at the outset is that, due to the aforementioned necessity, a scanning device must be structurally adapted to a specific printing press.
  • the invention has for its object to provide a device for zone-by-zone opto-electronic measurement of the area coverage of offset printing plates or of templates used for the production of offset printing plates, with which signals for setting ink zone screws can be generated, which can be assigned to differently wide ink zones, so that the Device is no longer tied to a single type of press.
  • the advantage of the device according to the characterizing part of claim 1 is that when using several rows of receiving elements of different widths, each of which corresponds to the ink zone widths of certain printing press types, an inexpensive construction is possible and that when scanning originals that are used in printing presses with different Color zone width are to be reproduced, only a switch from one row to another row of recording elements is required.
  • a device designed according to claim 2 has the advantage that a space-saving device construction is possible by using only a single row of receptacle elements, the summation of the measurement signals derived from the individual receptacle elements for the respective zone width automatically by the appropriate programming of a computer is possible, so that templates for different color zone widths can be measured without great effort and exchange manipulations.
  • the device designed according to claim 3, on the other hand, enables continuous adaptation to any color zone width, so that these are used particularly where printing presses of different makes and thus non-coordinated color zones are available, for which the templates to be reproduced are to be measured with a single device .
  • a film assembly intended for the production of an offset printing plate is indicated at 1, the area coverage, ie the ratio of light to dark areas, can advantageously be used to adjust the ink zone screws in the area of the ink knife of a printing press.
  • the film assembly 1 is transported between a light source 2 and a sensor 3, which are arranged in a measuring chamber provided with an input slot 4 and an output slot 5.
  • two pairs of rollers 7 and 8 arranged next to one another at a small distance are provided for the lateral limitation of the measuring chamber 6.
  • the roller pairs 7 and 8 each contain one driven transport roller 9 and a driven pressure roller 10, between which the film assembly 1 is passed and which are therefore employed to form the input slot 4 and the output slot 5 against each other.
  • the pairs of rollers 7 and 8 advantageously take over the insertion and further transport of the film assembly 1 as well as shielding the measuring chamber 6 against laterally penetrating scattered light.
  • a speed-controlled motor 11 can be used to drive the transport rollers 9 in order to ensure a constant transport speed.
  • a common motor 11 is provided for the transport rollers 9 of both pairs of rollers 7 and 8, which can be connected via a belt 12 to the driven transport rollers 9 of both pairs 7 and 8.
  • the non-driven rollers 10 of the roller pairs 7 and 8 can adapt themselves to the set transport speed. In practice, a transport speed of one to three, but preferably two meters per minute is expedient.
  • a guide plate 13 leading up to the roller surface can expediently be arranged, the bearing surface of which is aligned with the input and output slots 4 and 5 for receiving the film assembly.
  • This ensures a simple way of guiding the film assembly 1, in particular the beginnings and ends, from the input slot 4 to the output slot 5 and also shielding the measuring chamber 6 against dirt or light penetrating from the drive.
  • a removable cover 14 is provided in the area of the transport rollers 9.
  • the light source 2 consists, for example, of a commercially available tubular lamp and is mounted on the cover 14 by means of a holder 15.
  • the width of the receiving elements 16 and thus of the transducer 3 is small in relation to their length.
  • the small light-sensitive recording surface achieved in this way can thus advantageously be uniformly illuminated without any effort.
  • Commercial optical elements, such as so-called fiber optics are suitable as receiving elements 16.
  • the receiving elements 16 are embedded in narrow recesses 17 of the guide plate 13.
  • the light flux emitted by the light source 2, passing through the film 1 and detected by the receiving elements 16 is, as shown in FIG. 3, fed to the individual receiving elements 16 downstream photo elements 18.
  • the photo elements 18 generate an electrical signal proportional to the incoming light intensity, which is integrated in integrators 19 or in a microprocessor over the entire length of the film.
  • the output signal of an integrator 19 thus corresponds exactly to the area coverage of the assigned zone of the film 1, which, as already mentioned, is identical in width to the ink zone width of a printing press.
  • This output signal can optionally be displayed visually with prior storage in a memory 20 on a display panel 21 and / or processed via a computer 22, preferably a microprocessor, and stored in a memory 23, after which it is used to adjust the ink fountain keys in a printing press at Reproduction of the measured template is available.
  • the width of the receiving elements 16, seen transversely to the transport direction of the film assembly 1, corresponds to the ink zone width of a specific printing press. If templates now have to be scanned which are to be reproduced in printing presses with a different ink zone width, then according to one embodiment of the invention the device described above is switched over to a second pickup 3 '.
  • the pickup 3 ' has receiving elements 16', the width of which deviates from that of the receiving elements 16 and are matched to the ink zone width of this other printing press.
  • the light components detected by the receiving elements 16 ' are converted into proportional electrical signals in photo elements 18' which can be supplied to the electrical circuits 19 to 21 instead of the signals generated by the photo elements 18.
  • the sensor 3 or the sensor 3 ' can be used depending on the ink zone width of the printing presses. It is understood that this embodiment of the invention is not limited to the use of only two rows of receiving elements 16 and 16 '.
  • the light coming from the light source 2 and passing through the film assembly 1 is detected by a multiplicity of receiving elements 24 and, after corresponding conversion into electrical signals and after integration in the individual circuits, which are not described in more detail, reaches a computer 25.
  • a multiplicity of receiving elements 24 In the exemplary embodiment according to FIG. 4, for the sake of simplicity, twelve of the receiving elements 24, 24 1 to 24 "are shown. Depending on the width of the ink zone, the printing measure used in each case The number 25 of recording elements is added up in the computer 25. In the example described here there are three receiving elements.
  • the resulting signal is used to control an ink zone screw, which influences a ink zone area in a printing press, the ink zone of which is as wide as the width of three recording elements.
  • the ink zone adjusting screws 26, 26 1 to 26 “" are symbolically indicated with the individual ink knives assigned to them.
  • the control signals for the four color zone adjusting screws 26 to 26 m shown are thus generated by combining the measured values from each of three of the receiving elements 24 to 24 ". It is essential in the embodiment according to FIG.
  • the measuring zone width of a receiving element 24 is common to all of the color zone widths If, for example, printing presses are used whose zone widths are 40 mm, 35 mm and 30 mm, then a receiving element 24 with a measuring zone width of 5 mm must be used, in which case eight receiving elements 24 are used for a color zone width of 40 mm a color zone width of 35 mm, seven recording elements 24 and, with a color zone width of 30 mm, six recording elements 24 combined or the measurement signals derived from them summed up in a computer 25, preferably a microprocessor, and processed to control the respective color zone screws.
  • a memory which is no longer shown in FIG. 4, can be used, in which the signals generated by the computer 25 are stored and which can be read in a known manner as required when reproducing the measured template for controlling the ink fountain keys.
  • a scissor grid 29 or a functionally equivalent element is arranged between the side walls 27 and 28 and is fixed on the left side wall 27 and its length can be changed on the right side wall 28.
  • a threaded spindle 30 rotatably mounted in the side wall 28 can be used, upon rotation of which a guide nut 31 arranged on it, which is connected to the right end of the scissor lattice 29, is displaced in the left-right direction.
  • Receiving elements 32 are fastened on each leg of the scissor grid 29 running parallel to one another, with which certain measuring zone regions can be detected.
  • the scissor grid is arranged transversely to the transport direction of a template to be measured.
  • the measuring zone area which can be detected by a recording element 32 to 32 "can be matched to the width of the color zone of the machine used for the reproduction of a template to be measured, since the projection of the recording elements 32 onto the measuring line also Can be infinitely varied with the aid of the spindle 30.
  • the device can be adapted to the ink zone width of a wide variety of printing presses by a suitable inclination of the scissor grid 29.
  • the incident light method e.g. B. for scanning printing plates.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Photometry And Measurement Of Optical Pulse Characteristics (AREA)

Description

Die Erfindung betrifft eine Vorrichtung zur zonenweisen opto-elektronischen Messung der Flächendeckung einer Offset-Druckplatte oder einer der Offset-Druckplattenherstellung dienenden Druckvorlage, deren Helligkeitsverteilung durch mehrere quer zur Transportrichtung der Druckvorlage angeordnete Aufnahmeelemente erfaßbar und einer Schaltung zur Erzeugung von Signalen zur Einstellung von Farbzonenschrauben zuführbar ist.The invention relates to a device for zone-by-zone opto-electronic measurement of the area coverage of an offset printing plate or a printing template serving for the production of offset printing plates, the brightness distribution of which can be detected by a plurality of recording elements arranged transversely to the transport direction of the printing template and can be supplied to a circuit for generating signals for setting ink fountain keys is.

Aus der DE-Offenlegungsschrift 1 761 333 ist es bekannt, zur Einstellung der Farbmesser am Farbkasten von Offset-Rotationsdruckmaschinen die Druckform bzw. Druckvorlage (Film-Montage) hinsichtlich ihrer Flächendeckung auszuwerten und daraus Einstellsignale für die Farbzonenschrauben zu erzeugen. So läßt sich beispielsweise im Durchlichtverfahren durch Vermessen von Positivfilmen, Negativfilmen oder Film-Klebe-Montagen oder in Auflichtverfahren durch Vermessen von Druckplatten oder Papierklebemontagen ein individuelles Maß zur Einstellung der einzelnen Farbzonenschrauben ermitteln.From DE-Offenlegungsschrift 1 761 333 it is known to evaluate the printing form or printing template (film montage) with regard to its area coverage for setting the ink knife on the ink fountain of offset rotary printing presses and to generate setting signals for the ink fountain key therefrom. For example, in the transmitted light method by measuring positive films, negative films or film / adhesive assemblies or in incident light methods by measuring printing plates or paper adhesive assemblies, an individual measure for setting the individual ink fountain key can be determined.

Eine Voraussetzung bei der eingangs spezifizierten Vorrichtung ist es, daß die durch die Aufnahmeelemente definierte Meßzone die gleiche Breite aufweist wie die Farbzonenbreite der Druckmaschine, in der die ermittelten aus der Helligkeitsverteilung der abzutastenden Vorlage abgeleiteten Signale zur Einstellung der Farbzonenschrauben verwendet werden sollen. Bei dem aus der DE-Offenlegungsschrift 2 618 387 bekannten Film-Abtastgerät sind deshalb die quer zur Transportrichtung des abzutastenden Filmes angeordneten Aufnehmer so bemessen, daß die von einem Aufnehmer erfaßte Zone eine Breite aufweist, die identisch ist mit der konstruktiv bedingten Farbzonenbreite der Druckmaschine, in der die abzutastende Druckvorlage reproduziert werden soll. Der Nachteil der bisher bekannten Abtastgeräte gemäß der eingangs spezifizierten Art liegt darin, daß bedingt durch die vorgenannte Notwendigkeit ein Abtastgerät konstruktiv an eine bestimmte Druckmaschine angepaßt werden muß.A prerequisite for the device specified at the outset is that the measuring zone defined by the receiving elements has the same width as the ink zone width of the printing press in which the signals derived from the brightness distribution of the original to be scanned are to be used to adjust the ink zone screws. In the film scanning device known from DE-Offenlegungsschrift 2,618,387, the pickups arranged transversely to the transport direction of the film to be scanned are therefore dimensioned such that the zone detected by a pickup has a width which is identical to the constructionally determined ink zone width of the printing press, in which the artwork to be scanned is to be reproduced. The disadvantage of the previously known scanning devices according to the type specified at the outset is that, due to the aforementioned necessity, a scanning device must be structurally adapted to a specific printing press.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zur zonenweisen opto-elektronischen Messung der Flächendeckung von OffsetDruckplatten oder von der Offset-Druckplattenherstellung dienenden Vorlagen aufzuzeigen, mit der Signale zur Einstellung von Farbzonenschrauben erzeugbar sind, die unterschiedlich breiten Farbzonen zugeordnet sein können, so daß die Vorrichtung nicht mehr an einen einzigen Druckmaschinentyp gebunden ist.The invention has for its object to provide a device for zone-by-zone opto-electronic measurement of the area coverage of offset printing plates or of templates used for the production of offset printing plates, with which signals for setting ink zone screws can be generated, which can be assigned to differently wide ink zones, so that the Device is no longer tied to a single type of press.

Diese Aufgabe wird jeweils gemäß dem Kennzeichen eines der Ansprüche 1 bis 3 gelöst. Vorteilhafte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und aus der Beschreibung in Verbindung mit den Zeichnungen.This object is achieved according to the characterizing part of one of claims 1 to 3. Advantageous developments of the invention result from the subclaims and from the description in conjunction with the drawings.

Der Vorteil der Vorrichtung gemäß dem Kennzeichen des Anspruchs 1 liegt darin, daß bei der Verwendung mehrerer Reihen von Aufnahmeelementen unterschiedlicher Breite, die jeweils den Farbzonenbreiten bestimmter Druckmaschinentypen entsprechen, ein kostengünstiger Aufbau möglich ist und daß bei der Abtastung von Vorlagen, die in Druckmaschinen mit verschiedener Farbzonenbreite reproduziert werden sollen, jeweils lediglich eine Umschaltung von einer Reihe auf eine andere Reihe von Aufnahmeelementen erforderlich ist. Im Vergleich dazu bietet eine gemäß Anspruch 2 ausgebildete Vorrichtung den Vorteil, daß durch die Verwendung nur einer einzigen Reihe von Aufnahmeelementen ein raumsparender Geräteaufbau möglich ist, wobei die Aufsummierung der von den einzelnen Aufnahmeelementen abgeleiteten Meßsignale für die jeweilige Zonenbreite durch die entsprechende Programmierung eines Rechners automatisch möglich ist, so daß ohne größeren Aufwand und Austauschmanipulationen Vorlagen für unterschiedliche Farbzonenbreiten ausgemessen werden können. Die nach Anspruch 3 ausgestaltete Vorrichtung ermöglicht hingegen eine kontinuierliche Adaption an jede beliebige Farbzonenbreite, so daß diese besonders dort eingesetzt werden, wo Druckmaschinen unterschiedlicher Fabrikate und somit nicht aufeinander abgestimmte Farbzonen vorhanden sind, für die mit einem einzigen Gerät die zu reproduzierenden Vorlagen vermessen werden sollen.The advantage of the device according to the characterizing part of claim 1 is that when using several rows of receiving elements of different widths, each of which corresponds to the ink zone widths of certain printing press types, an inexpensive construction is possible and that when scanning originals that are used in printing presses with different Color zone width are to be reproduced, only a switch from one row to another row of recording elements is required. In comparison, a device designed according to claim 2 has the advantage that a space-saving device construction is possible by using only a single row of receptacle elements, the summation of the measurement signals derived from the individual receptacle elements for the respective zone width automatically by the appropriate programming of a computer is possible, so that templates for different color zone widths can be measured without great effort and exchange manipulations. The device designed according to claim 3, on the other hand, enables continuous adaptation to any color zone width, so that these are used particularly where printing presses of different makes and thus non-coordinated color zones are available, for which the templates to be reproduced are to be measured with a single device .

Im folgenden wird die Erfindung anhand dreier Ausführungsbeispiele im einzelnen beschrieben, wobei Bezug auf die beiliegenden Zeichnungen genommen wird. In diesen zeigen:

  • Fig. 1 einen in Filmtransportrichtung gelegten Schnitt durch eine Vorrichtung gemäß einer ersten Ausführungsform;
  • Fig. 2 eine Vorderansicht der in Fig. 1 gezeigten Vorrichtung;
  • Fig.3 ein Blockschaltbild der Vorrichtung gemäß Fig. 1 und 2;
  • Fig. 4 eine zweite Ausführungsform deren Aufnahmeelemente und
  • Fig. 5a und 5b eine dritte Ausführungsform.
The invention is described in detail below with reference to three exemplary embodiments, reference being made to the accompanying drawings. In these show:
  • 1 shows a section taken in the film transport direction through a device according to a first embodiment;
  • Fig. 2 is a front view of the device shown in Fig. 1;
  • 3 shows a block diagram of the device according to FIGS. 1 and 2;
  • Fig. 4 shows a second embodiment of the receiving elements and
  • 5a and 5b a third embodiment.

In Fig. 1 ist bei 1 eine zur Herstellung einer Offsetdruckplatte bestimmte Filmmontage angedeutet, deren Flächendeckung, d. h. das Verhältnis von hellen zu dunklen Flächen, vorteilhaft zur Einstellung der Farbzonenschrauben im Bereich des Farbmessers einer Druckmaschine verwendet werden kann. Hierzu wird die Filmmontage 1 zwischen einer Lichtquelle 2 und einem Aufnehmer 3 hindurchtransportiert, die in einer mit einem Eingabeschlitz 4 und einem Ausgabeschlitz 5 versehenen Meßkammer angeordnet sind. Im dargestellten Ausführungsbeispiel sind zur seitlichen Begrenzung der Meßkammer 6 zwei mit geringem Abstand nebeneinander angeordnete Walzenpaare 7 und 8 vorgesehen. Die Walzenpaare 7 und 8 enthalten jeweils eine angetriebene Transportwalze 9 und eine mitgenommene Anpreßwalze 10, zwischen denen die Filmmontage 1 hindurchgeführt wird und die daher unter Bildung des Eingabeschlitzes 4 bzw. des Ausgabeschlitzes 5 gegeneinander angestellt sind. Die Walzenpaare 7 und 8 übernehmen dabei in vorteilhafter Weise gleichzeitig den Einzug und Weitertransport der Filmmontage 1 sowie Abschirmung der Meßkammer 6 gegen seitlich eindringendes Streulicht. Zum Antrieb der Transportwalzen 9 kann zur Gewährleistung einer konstanten Transportgeschwindigkeit ein drehzahlgeregelter Motor 11 Verwendung finden. Im dargestellten Ausführungsbeispiel ist für die Transportwalzen 9 beider Walzenpaare 7 und 8 ein gemeinsamer Motor 11 vorgesehen, der über einen Riemen 12 mit den angetriebenen Transportwalzen 9 beider Paare 7 und 8 verbunden sein kann. Durch die Verwendung eines gemeinsamen Antriebsmotors sind im Bereich beider Walzenpaare 7 und 8 gleiche Transportgeschwindigkeiten und damit eine gestraffte Führung der Filmmontage 1 sichergestellt. Die nicht angetriebenen Walzen 10 der Walzenpaare 7 und 8 können sich selbständig der eingestellten Transportgeschwindigkeit anpassen. In der Praxis ist eine Transportgeschwindigkeit von einem bis drei, vorzugsweise jedoch zwei Metern pro Minute zweckmäßig.In Fig. 1, a film assembly intended for the production of an offset printing plate is indicated at 1, the area coverage, ie the ratio of light to dark areas, can advantageously be used to adjust the ink zone screws in the area of the ink knife of a printing press. For this purpose, the film assembly 1 is transported between a light source 2 and a sensor 3, which are arranged in a measuring chamber provided with an input slot 4 and an output slot 5. In the exemplary embodiment shown, two pairs of rollers 7 and 8 arranged next to one another at a small distance are provided for the lateral limitation of the measuring chamber 6. The roller pairs 7 and 8 each contain one driven transport roller 9 and a driven pressure roller 10, between which the film assembly 1 is passed and which are therefore employed to form the input slot 4 and the output slot 5 against each other. The pairs of rollers 7 and 8 advantageously take over the insertion and further transport of the film assembly 1 as well as shielding the measuring chamber 6 against laterally penetrating scattered light. A speed-controlled motor 11 can be used to drive the transport rollers 9 in order to ensure a constant transport speed. In the exemplary embodiment shown, a common motor 11 is provided for the transport rollers 9 of both pairs of rollers 7 and 8, which can be connected via a belt 12 to the driven transport rollers 9 of both pairs 7 and 8. By using a common drive motor, the same transport speeds are ensured in the area of both pairs of rollers 7 and 8 and thus a streamlined guidance of the film assembly 1. The non-driven rollers 10 of the roller pairs 7 and 8 can adapt themselves to the set transport speed. In practice, a transport speed of one to three, but preferably two meters per minute is expedient.

Zwischen den Transportwalzen 9 der nebeneinander angeordneten Walzenpaare 7 und 8 kann zweckmäßig ein bis an die Walzenoberfläche heranführendes Führungsblech 13 angeordnet sein, dessen Auflagefläche zur Aufnahme der Filmmontage auf die Ein- bzw. Ausgabeschlitze 4 bzw. 5 ausgerichtet ist. Hierdurch ist in einfacher Weise eine Führung der Filmmontage 1, insbesondere der Anfänge und der Enden, vom Eingabeschlitz 4 zum Ausgabeschlitz 5 und zudem eine Abschirmung der Meßkammer 6 gegen vom Antrieb her eindringenden Schmutz bzw. eindringendes Licht sichergestellt. Zurweiteren Abschirmung der Meßkammer 6 gegen unerwünschtes Streulicht ist im Bereich der Transportwalzen 9 eine abnehmbare Abdeckhaube 14 vorgesehen.Between the transport rollers 9 of the roller pairs 7 and 8 arranged next to one another, a guide plate 13 leading up to the roller surface can expediently be arranged, the bearing surface of which is aligned with the input and output slots 4 and 5 for receiving the film assembly. This ensures a simple way of guiding the film assembly 1, in particular the beginnings and ends, from the input slot 4 to the output slot 5 and also shielding the measuring chamber 6 against dirt or light penetrating from the drive. To further shield the measuring chamber 6 against unwanted scattered light, a removable cover 14 is provided in the area of the transport rollers 9.

In Fig. 2 ist die Abdeckhaube 14 in ihrer abgeschwenkten Stellung gezeigt. Die Lichtquelle 2 besteht beispielsweise aus einer handelsüblichen Röhrenlampe und ist mittels Halter 15 an der Abdeckhaube 14 gelagert. Der Auf nehmer 3, der, wie Fig. 2 erkennen läßt, über seine Länge zonenweise unterteilt ist, umfaßt mehrere Aufnahmeelemente 16, deren Länge genau der Breite einer Farbzone einer bestimmten Druckmaschine entspricht. Die Breite der Aufnahmeelemente 16 und damit des Aufnehmers 3 ist im Verhältnis zu ihrer Länge klein. Die dadurch erreichte kleine lichtempfindliche Aufnahmefläche kann somit in vorteilhafter Weise ohne jeden Aufwand gleichmä- βig ausgeleuchtet werden. Als Aufnahmeelemente 16 eignen sich handelsübliche optische Elemente, etwa sogenannte Faseroptiken. Die Aufnahmeelemente 16 sind in schmalen Ausnehmungen 17 des Führungsbleches 13 eingelassen. Der von der Lichtquelle 2 ausgesandte, durch den Film 1 hindurchtretende und von den Aufnahmeelementen 16 erfaßte Lichtstrom wird, wie Fig. 3 zeigt, den einzelnen Aufnahmeelementen 16 nachgeordneten Fotoelementen 18 zugeführt. Zweckmäßigerweise läßt sich dies durch Verwendung von Faseroptiken bewerkstelligen. Die Fotoelemente 18 erzeugen ein der ankommenden Lichtintensität proportionales elektrisches Signal, das jeweils in Integratoren 19 oder in einem Mikroprozessor über die gesamte Filmlänge aufintegriert wird. Das Ausgangssignal eines Integrators 19 entspricht somit genau der Flächendeckung der zugeordneten Zone des Films 1, die, wie bereits erwähnt, bezüglich ihrer Breite identisch mit der Farbzonenbreite einer Druckmaschine ist.In Fig. 2 the cover 14 is shown in its pivoted position. The light source 2 consists, for example, of a commercially available tubular lamp and is mounted on the cover 14 by means of a holder 15. On the subscriber 3, which, as shown in FIG. 2, is divided into zones along its length, comprises a plurality of receiving elements 16, the length of which corresponds exactly to the width of a color zone of a particular printing press. The width of the receiving elements 16 and thus of the transducer 3 is small in relation to their length. The small light-sensitive recording surface achieved in this way can thus advantageously be uniformly illuminated without any effort. Commercial optical elements, such as so-called fiber optics, are suitable as receiving elements 16. The receiving elements 16 are embedded in narrow recesses 17 of the guide plate 13. The light flux emitted by the light source 2, passing through the film 1 and detected by the receiving elements 16 is, as shown in FIG. 3, fed to the individual receiving elements 16 downstream photo elements 18. This can expediently be achieved by using fiber optics. The photo elements 18 generate an electrical signal proportional to the incoming light intensity, which is integrated in integrators 19 or in a microprocessor over the entire length of the film. The output signal of an integrator 19 thus corresponds exactly to the area coverage of the assigned zone of the film 1, which, as already mentioned, is identical in width to the ink zone width of a printing press.

Dieses Ausgangssignal kann gegebenenfalls unter vorheriger Speicherung in einem Speicher 20 auf einem Anzeigefeld 21 visuell dargestellt werden und/oder über einen Rechner 22, vorzugsweise einen Mikroprozessor, aufbereitet und in einem Speicher 23 gespeichert werden, wonach es zur Einstellung der Farbzonenschrauben in einer Druckmaschine bei der Reproduktion der ausgemessenen Vorlage zur Verfügung steht.This output signal can optionally be displayed visually with prior storage in a memory 20 on a display panel 21 and / or processed via a computer 22, preferably a microprocessor, and stored in a memory 23, after which it is used to adjust the ink fountain keys in a printing press at Reproduction of the measured template is available.

Die Breite der Aufnahmeelemente 16, quer zur Transportrichtung der Filmmontage 1 gesehen, entspricht der Farbzonenbreite einer bestimmten Druckmaschine. Müssen nun Vorlagen abgetastet werden, die in Druckmaschinen mit einer abweichenden Farbzonenbreite reproduziert werden sollen, so wird gemäß einer Ausführungsform der Erfindung die vorangehend beschriebene Vorrichtung auf einen zweiten Aufnehmer 3' umgeschaltet. Der Aufnehmer 3' weist Aufnahmeelemente 16' auf, deren Breite von denen der Aufnahmeelemente 16 abweicht und auf die Farbzonenbreite dieser anderen Druckmaschine abgestimmt sind.The width of the receiving elements 16, seen transversely to the transport direction of the film assembly 1, corresponds to the ink zone width of a specific printing press. If templates now have to be scanned which are to be reproduced in printing presses with a different ink zone width, then according to one embodiment of the invention the device described above is switched over to a second pickup 3 '. The pickup 3 'has receiving elements 16', the width of which deviates from that of the receiving elements 16 and are matched to the ink zone width of this other printing press.

Die von den Aufnahmeelementen 16' erfaßten Lichtanteile werden in Photoelementen 18' in proportionale elektrische Signale umgewandelt, die anstelle der von den Fotoelementen 18 erzeugten Signale der elektrischen Schaltung 19 bis 21 zuführbar sind. Wie aus Fig. 3 am besten hervorgeht, kann somit je nach der Farbzonenbreite der Druckmaschinen entweder mit dem Aufnehmer 3 oder mit dem Aufnehmer 3' gearbeitet werden. Es versteht sich, daß diese Ausführungsform der Erfindung nicht auf die Verwendung von lediglich zwei Reihen von Aufnahmeelementen 16 bzw. 16' beschränkt ist.The light components detected by the receiving elements 16 'are converted into proportional electrical signals in photo elements 18' which can be supplied to the electrical circuits 19 to 21 instead of the signals generated by the photo elements 18. As can best be seen in FIG. 3, depending on the ink zone width of the printing presses, either the sensor 3 or the sensor 3 'can be used. It is understood that this embodiment of the invention is not limited to the use of only two rows of receiving elements 16 and 16 '.

Fig. 4 zeigt eine zweite Lösungsvariante der eingangs genannten Aufgabe. Das von der Lichtquelle 2 kommende, die Filmmontage 1 durchsetzende Licht wird von einer Vielzahl von Aufnahmeelementen 24 erfaßt und gelangt nach entsprechender Umwandlung in elektrische Signale und nach erfolgter Integration in den einzelnen nicht näher bezeichneten Schaltungen an einen Rechner 25. In dem Ausführungsbeispiel gemäß Fig. 4 sind der Einfachheit halber zwölf der Aufnahmeelemente 24, 241 bis 24" dargestellt. In Abhängigkeit von der Farbzonenbreite der jeweils zum Einsatz kommenden Druckmaschine erfolgt in dem Rechner 25 die Aufsummierung einer Anzahl von Aufnahmeelementen. In dem hier beschriebenen Beispiel sind es drei Aufnahmeelemente. Das daraus jeweils entstehende Signal dient zur Steuerung einer Farbzonenschraube, die in einer Druckmaschine einen Farbzonenbereich beeinflußt, dessen Farbzone so breit ist wie die Breite von drei Aufnahmeelementen. In Fig. 4 sind die Farbzoneneinstellschrauben 26, 261 bis 26"" mit den diesen zugeordneten einzelnen Farbmessern symbolisch angedeutet. Durch Zusammenfassung der von jeweils drei der Aufnahmeelemente 24 bis 24" erfaßten Meßwerte erfolgt somit die Erzeugung der Steuersignale für die vier dargestellten Farbzoneneinstellschrauben 26 bis 26m. Wesentlich bei der Ausführungsform gemäß Fig. 4 ist es, daß die Meßzonenbreite eines Aufnahmeelementes 24 einem allen Farbzonenbreiten gemeinsamen Divisor entspricht. Kommen beispielsweise Druckmaschinen zum Einsatz, deren Zonenbreiten 40 mm, 35 mm und 30 mm betragen, so muß ein Aufnahmeelement 24 mit einer Meßzonenbreite von 5 mm verwendet werden. In diesem Fall werden bei einer Farbzonenbreite von 40 mm acht Aufnahmeelemente 24, bei einer Farbzonenbreite von 35 mm sieben Aufnahmeelemente 24 und bei einer Farbzonenbreite von 30 mm sechs Aufnahmeelemente 24 zusammengefaßt bzw. die von ihnen abgeleiteten Meßsignale in einem Rechner 25, vorzugsweise einem Mikroprozessor, aufsummiert und zur Steuerung der jeweiligen Farbzonenschrauben aufbereitet.4 shows a second variant of the solution to the problem mentioned at the beginning. The light coming from the light source 2 and passing through the film assembly 1 is detected by a multiplicity of receiving elements 24 and, after corresponding conversion into electrical signals and after integration in the individual circuits, which are not described in more detail, reaches a computer 25. In the exemplary embodiment according to FIG. 4, for the sake of simplicity, twelve of the receiving elements 24, 24 1 to 24 "are shown. Depending on the width of the ink zone, the printing measure used in each case The number 25 of recording elements is added up in the computer 25. In the example described here there are three receiving elements. The resulting signal is used to control an ink zone screw, which influences a ink zone area in a printing press, the ink zone of which is as wide as the width of three recording elements. 4, the ink zone adjusting screws 26, 26 1 to 26 "" are symbolically indicated with the individual ink knives assigned to them. The control signals for the four color zone adjusting screws 26 to 26 m shown are thus generated by combining the measured values from each of three of the receiving elements 24 to 24 ". It is essential in the embodiment according to FIG. 4 that the measuring zone width of a receiving element 24 is common to all of the color zone widths If, for example, printing presses are used whose zone widths are 40 mm, 35 mm and 30 mm, then a receiving element 24 with a measuring zone width of 5 mm must be used, in which case eight receiving elements 24 are used for a color zone width of 40 mm a color zone width of 35 mm, seven recording elements 24 and, with a color zone width of 30 mm, six recording elements 24 combined or the measurement signals derived from them summed up in a computer 25, preferably a microprocessor, and processed to control the respective color zone screws.

Dabei kann ein in Fig. 4 nicht mehr dargestellter Speicher verwendet werden, in dem die von dem Rechner 25 erzeugten Signale abgespeichert werden und der nach Bedarf bei der Reproduktion der ausgemessenen Vorlage zur Steuerung der Farbzonenschrauben in bekannter Weise lesbar ist.A memory, which is no longer shown in FIG. 4, can be used, in which the signals generated by the computer 25 are stored and which can be read in a known manner as required when reproducing the measured template for controlling the ink fountain keys.

In Fig. 5 und 5 b ist die dritte Lösung der der Erfindung zugrundeliegenden Aufgabe schematisch dargestellt. Zwischen Seitenwänden 27 und 28 ist ein Scherengitter 29 oder ein funktions- äquivalentes Element angeordnet, das an der linken Seitenwand 27 fixiert und an der rechten Seitenwand 28 bezüglich seiner Länge veränderbar ist. Zur Längenänderung des Scherengitters 29 kann eine in der Seitenwand 28 drehbar gelagerte Gewindespindel 30 verwendet werden, bei deren Drehung eine auf ihr angeordnete Führungsmutter 31, die mit dem rechten Ende des Scherengitters 29 verbunden ist, in Links-Rechtsrichtung verschoben wird. Auf jeweils parallel zueinander verlaufenden Schenkeln des Scherengitters 29 sind Aufnahmeelemente 32 befestigt, mit denen bestimmte Meßzonenbereiche erfaßbar sind. Das Scherengitter ist quer zur Transportrichtung einer zu messenden Vorlage angeordnet. Durch die Wahl der Schrägstellung der sich an den Endpunkten überlappenden Aufnahmeelemente 32 ist der jeweils von einem Aufnahmeelement 32 bis 32" erfaßbare Meßzonenbereich an die Farbzonenbreite der für die Reproduzierung einer zu messenden Vorlage verwendeten Maschine angleichbar, da die Projektion der Aufnahmeelemente 32 auf die Meßlinie mit Hilfe der Spindel 30 stufenlos veränderbar ist. Somit kann, in einem bestimmten Größenbereich, eine Anpassung der Vorrichtung durch eine geeignete Schrägstellung des Scherengitters 29 an die Farbzonenbreite unterschiedlichster Druckmaschinen erreicht werden.5 and 5 b, the third solution to the problem on which the invention is based is shown schematically. A scissor grid 29 or a functionally equivalent element is arranged between the side walls 27 and 28 and is fixed on the left side wall 27 and its length can be changed on the right side wall 28. To change the length of the scissor lattice 29, a threaded spindle 30 rotatably mounted in the side wall 28 can be used, upon rotation of which a guide nut 31 arranged on it, which is connected to the right end of the scissor lattice 29, is displaced in the left-right direction. Receiving elements 32 are fastened on each leg of the scissor grid 29 running parallel to one another, with which certain measuring zone regions can be detected. The scissor grid is arranged transversely to the transport direction of a template to be measured. Through the choice of the inclination of the recording elements 32 overlapping at the end points, the measuring zone area which can be detected by a recording element 32 to 32 "can be matched to the width of the color zone of the machine used for the reproduction of a template to be measured, since the projection of the recording elements 32 onto the measuring line also Can be infinitely varied with the aid of the spindle 30. Thus, in a certain size range, the device can be adapted to the ink zone width of a wide variety of printing presses by a suitable inclination of the scissor grid 29.

Anstelle des hier beschriebenen Durchlichtverfahrens kann auch nach dem Auflichtverfahren, z. B. zum Abtasten von Druckplatten, gearbeitet werden.Instead of the transmitted light method described here, the incident light method, e.g. B. for scanning printing plates.

Claims (6)

1. Device for the opto-electronic measurement, in zones, of the surface coverage of an offset printing plate or master used to produce offset printing plates, whose distribution of brightness can be determined with several pick-up elements arranged across the transport direction of the master and fed to a circuit for the production of signals to adjust ink zone screws, characterised in that there are provided across the transport direction of the master (1) at least two rows (3, 3') of pick-up elements (16, 16') of different lengths, which can be connected optionally to the said circuit (19 to 23) and added up therein in zones.
2. Device for the opto-electronic measurement, in zones, of the surface coverage of an offset printing plate or a master used to produce offset printing plates, whose distribution of brightness can be determined by several pick-up elements arranged across the transport direction of the master and fed to a circuit for the production of signals to adjust ink zone screws, characterised in that one dimension (e. g. 5 mm) of the pick-up elements (24, 24\ 24") across the transport direction of the master (1) is equal to a common divisor (e. g. 5) of the ink zone widths (e. g. 30 mm, 35 mm, 40 mm) of the masters to be measured, and in that the signals derived from the pick-up elements (24, 241, 24") can be added up in the circuit in zones.
3. Device for the opto-electronic measurement, in zones, of the surface coverage of an offset printing plate or a master used to produce offset printing plates, whose distribution of brightness can be determined by several pick-up elements arranged across the transport direction of the master and fed to a circuit for the production of signals to adjust ink zone screws, characterised in that the pick-up elements (32 to 32") are arranged on parallel limbs of an adjustable lattice grate (29) arranged across the transport direction of the master (1).
4. Device according to one of the claims 1 to 3, characterised in that the circuit comprises a computer (22, 25).
5. Device according to claim 4, characterised in that the computer (22, 25) is a microprocessor.
6. Device according to one of the above claims, characterised in that photoelements are used as pick-up elements (16, 24, 32), or photoconductors which are connected to photoelements.
EP80106733A 1979-12-15 1980-11-03 Device for the opto-electronic zonal measurement of the area coverage of a printing sheet Expired EP0031881B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792950606 DE2950606A1 (en) 1979-12-15 1979-12-15 DEVICE FOR ZONE-WAY OPTOELECTRONIC MEASUREMENT OF THE AREA COVERAGE OF A PRINT ORIGINAL
DE2950606 1979-12-15

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EP0031881A1 EP0031881A1 (en) 1981-07-15
EP0031881B1 true EP0031881B1 (en) 1984-04-25

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EP (1) EP0031881B1 (en)
JP (1) JPS5697839A (en)
DE (2) DE2950606A1 (en)

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Also Published As

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EP0031881A1 (en) 1981-07-15
JPS5697839A (en) 1981-08-06
DE3067642D1 (en) 1984-05-30
DE2950606A1 (en) 1981-06-19
US4390958A (en) 1983-06-28

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