EP1593508B1 - Register sensor - Google Patents

Register sensor Download PDF

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Publication number
EP1593508B1
EP1593508B1 EP05102757A EP05102757A EP1593508B1 EP 1593508 B1 EP1593508 B1 EP 1593508B1 EP 05102757 A EP05102757 A EP 05102757A EP 05102757 A EP05102757 A EP 05102757A EP 1593508 B1 EP1593508 B1 EP 1593508B1
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Prior art keywords
register
printing
sensor
register sensor
edges
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EP05102757A
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German (de)
French (fr)
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EP1593508A3 (en
EP1593508A2 (en
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Wolfgang Geissler
Christopher Riegel
Frank Schumann
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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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
    • B41F33/0081—Devices for scanning register marks

Definitions

  • the present invention relates to a device in a substrate-processing machine with a register sensor for register measurement between at least two superimposed printed on a substrate color separations of a printed image, the register sensor detects the deviation between two superimposed color separations on the substrate optically and forwards to a computer.
  • every printing press with at least two printing units offers the possibility of minimizing these register deviations by means of correction.
  • the changed register settings can be manually entered by an operator of the printing press in the control of the same or it is an automatic control device, an automatic register adjustment, installed, which recognizes register deviations by means of a sensor and transmits them to the control of the printing press, so that the controller the press makes appropriate adjustments to the settings to minimize register deviation.
  • Such a device is from the DE 101 32 266 A1 known.
  • the publication DE 100 30 572 A1 shows a registration system for a web-processing machine with a sensor system for detecting registration marks.
  • the registration control system has a control unit for controlling the transport of the web as a function of the detection of the registration marks by the sensor system.
  • the sensor system has at least one camera and an illumination system for illuminating the field of view of the camera.
  • the camera is a CCD camera.
  • the patent JP 58-190703 shows a register mark sensor for a printing press.
  • a photosensitive surface for detecting register marks is divided into four areas by means of a horizontal and an oblique line, with the horizontal line and the oblique line intersecting at the center of the circularly shaped photosensitive surface.
  • the photosensitive surface is formed from four fiberglass elements, which are bundled.
  • the new two-quadrant photodiode shows an arrangement of two photosensitive elements onto which a field to be illuminated, which is present on the printing material, is imaged by means of an optical system.
  • a field is a register mark applied to the printing substrate.
  • the photosensitive elements convert the image of the illuminated field into electrical signals, which in a downstream electronics such.
  • B. a control computer of the printing press or a separate measuring electronics are converted into a measured variable, which is a measure of the size of the register deviation.
  • a control computer of the printing press or a separate measuring electronics are converted into a measured variable, which is a measure of the size of the register deviation.
  • a measure of the size of the register deviation Depending on how many measuring fields are present on relatively spaced color separations on the substrate, several measurement runs are necessary.
  • the largely rectangular evaluation surfaces of the two-quadrant photodiode are aligned obliquely with respect to edges of the conveyed printing material. Since the edges of the register marks on the substrate usually do not run parallel to the edges of the printing material, but are formed as oblique wedges, the detection of these oblique edges can be improved with an obliquely arranged photodiode. In order for lines aligned parallel to the edges of the printing material to be recognized worse, however, can be achieved by the improved detection of the oblique edges a total of a smoother signal. Thus, the photodiode can be aligned so that the signal is approximately the same for both oblique and parallel aligned edges of the register marks.
  • the register sensor is a four-quadrant photodiode whose measuring surfaces have at least partially oblique edges.
  • the photodiode four measuring fields, which are once divided vertically and once obliquely.
  • the evaluation electronics can thus be achieved an optimal detection of parallel as well as obliquely aligned register marks.
  • the register sensor is a CCD imager whose signals are evaluated by means of image processing electronics and fed to the computer.
  • imaging elements are used here, which deliver the signals to an image processing electronics.
  • the CCD image converter thus work as a video camera, which detects the parallel or obliquely oriented edges of the register marks, wherein the image captured by the camera in the image processing electronics is processed by appropriate algorithms so that the position of the parallel and oblique edges of the register marks the computer the printing material processing machine can be transmitted. Even so, reliable detection of register marks is possible.
  • the printing press 1 in Fig. 1 is a sheet-fed rotary printing machine with a feeder module 2 for conveying printed sheets 705 from a stack of sheets in the printing machine 1 and with a boom 3 at the other end of the printing machine 1, which stacks printed printed sheets 705.
  • a feeder module 2 for conveying printed sheets 705 from a stack of sheets in the printing machine 1 and with a boom 3 at the other end of the printing machine 1, which stacks printed printed sheets 705.
  • the inline measuring device does not necessarily have to be installed in the last printing unit 5.
  • the inline measuring device 6 is used primarily for the spectral measurement of the print control strip on the signatures 705 after passing through the printing press 1 in order to be able to carry out automatic color control.
  • Fig. 1 is a sheet-fed rotary printing machine with a feeder module 2 for conveying printed sheets 705 from a stack of sheets in the printing machine 1 and with a boom
  • register sensors 15 are mounted, wherein these register sensors 15 can in principle also be integrated in the measuring beam 6.
  • the register sensors 15 are mounted in the edge regions, so that they respectively detect the longitudinal edge region of the sheets 705 in the direction of sheet travel. If no inline measuring device 6 is present in the printing machine, the register sensors 15 are attached by means of a separate suspension in the printing unit 5 over the transport path of the printed sheets 705. It is important that the register sensors 15 are mounted so close to the sheet transport path that they can easily recognize the register marks on the print sheet 705 and on the other hand are not placed too close, so that the printed sheets 705 do not touch the register sensors 15 and thereby pollute or damage.
  • the sensors 15 are on the measuring beam 6 of Inline measuring device mounted and removable together with this, which in turn is installed in the vicinity of the printing nip 100 of the last printing unit 5.
  • This offers the advantage that the printed sheet 705 is always held by the printing gap 100, which is formed by a printing cylinder 8 and a counter-pressure cylinder 7, as well as by the sheet grippers 101 of the impression cylinder 7 during the measurement by the inline measuring bar 6 or the register sensors 15 and thus is stabilized for measurement.
  • the printing units 4, 5 of the printing machine 1 each have side walls 14, in which the printing cylinders 7, 8 are mounted.
  • each of the printing units 4, 5 an inking unit 13.
  • a computer 10 which transmits setting commands to the printing machine 1 and monitors the printing machine 1 by constantly transmitting measured values from the inline measuring device 6 and the register sensors 15 to the computer 10.
  • the register sensors 15 are involved in the control and regulation of the printing machine 1, so that occurring during the printing process register deviations between individual color separations on the print sheet 705 can be compensated by the computer 10.
  • FIG. 2 A first embodiment of the register sensors 15 is shown in FIG Fig. 2 to see which is constructed as a two-quadrant photodiode.
  • two register sensors 15 are mounted in the lateral areas of the printing unit 5, so that they can scan the edge areas of the print sheet 705 with the register marks.
  • the two quadrants of the photodiode of the register sensor 15 are rectangular in shape and aligned parallel to the front edge of the conveyed by the printing press 1 sheet 705.
  • the two surfaces of the register sensor 15 are connected so that the difference of the signals is supplied to the computer 10.
  • the photodiode is aligned obliquely to the front edge of the print sheet 705 in order to better recognize the oblique edges of register marks. Even if it then horizontal edges of the register marks are recognized worse, so leads the oblique arrangement according to Fig. 2a but to a more uniform signal, which improves the detection of the position of the register marks overall.
  • a further embodiment according to Fig. 3 combines the advantages of detecting straight and oblique edges of register marks.
  • the register sensor 15 has a four-quadrant photodiode which has a straight and an oblique subdivision.
  • the tapered register sensor surfaces 16 By means of the tapered register sensor surfaces 16, it is possible to recognize oblique edges outstanding, with the straight subdivision even straight edges can be very well recognized.
  • the signals 16.1 and 16.3 are summed in the computer 10 and the signals of the surfaces 16.2 and 16.4.
  • the signals 16.1 and 16.2 are summed and the signals 16.3 and 16.4.
  • the two signals resulting from the summing operations are then subtracted.
  • the computer 10 therefore has four inputs for the four fields of the four-quadrant photodiode of the register sensor 15.
  • the electronics for evaluation of the register sensor 15 may be located outside the computer 10 directly in the sensor 15 or the measuring beam 6, in which case the electronics two more Outputs for straight and oblique edges, the signals are passed to the computer 10.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Controlling Sheets Or Webs (AREA)
  • Spectrometry And Color Measurement (AREA)

Description

Die vorliegende Erfindung betrifft eine Vorrichtung in einer Bedruckstoffe verarbeitende Maschine mit einem Registersensor zur Registermessung zwischen wenigstens zwei übereinander gedruckten auf einem Bedruckstoff vorliegenden Farbauszügen eines Druckbildes, wobei der Registersensor die Abweichung zwischen zwei übereinander liegenden Farbauszügen auf dem Bedruckstoff optisch erfasst und an einen Rechner weiterleitet.The present invention relates to a device in a substrate-processing machine with a register sensor for register measurement between at least two superimposed printed on a substrate color separations of a printed image, the register sensor detects the deviation between two superimposed color separations on the substrate optically and forwards to a computer.

Bei jeder Druckmaschine mit mehreren Druckwerken besteht grundsätzlich die Gefahr, dass die übereinander gedruckten Farbauszüge nicht exakt übereinander gedruckt werden und sogenannte Registerabweichungen aufweisen. Deshalb bietet jede Druckmaschine mit wenigstens zwei Druckwerken die Möglichkeit, diese Registerabweichungen durch Korrektureinrichtungen zu minimieren. Die veränderten Registereinstellungen können dabei von Hand durch einen Bediener der Druckmaschine in die Steuerung derselben eingegeben werden oder es ist eine selbsttätige Regeleinrichtung, eine automatische Registerverstellung, eingebaut, welche mittels eines Sensors Registerabweichungen erkennt und diese an die Steuerung der Druckmaschine übermittelt, so dass die Steuerung der Druckmaschine entsprechende Änderungen an den Einstellungen vornimmt, um die Registerabweichung zu minimieren. Eine solche Vorrichtung ist aus der DE 101 32 266 A1 bekannt.In the case of every printing machine having a plurality of printing units, there is in principle the danger that the color separations printed on top of one another are not printed exactly one above the other and have register deviations. Therefore, every printing press with at least two printing units offers the possibility of minimizing these register deviations by means of correction. The changed register settings can be manually entered by an operator of the printing press in the control of the same or it is an automatic control device, an automatic register adjustment, installed, which recognizes register deviations by means of a sensor and transmits them to the control of the printing press, so that the controller the press makes appropriate adjustments to the settings to minimize register deviation. Such a device is from the DE 101 32 266 A1 known.

Die Offenlegungsschrift DE 100 30 572 A1 zeigt ein Passerregelungssystem für eine bahnverarbeitende Maschine mit einem Sensorsystem zur Erfassung von Passermarken. Das Passerregelungssystem weist eine Steuereinheit zur Steuerung des Transports der Bahn in Abhängigkeit der Detektion der Passermarken durch das Sensorsystem auf. Das Sensorsystem weist wenigstens eine Kamera und ein Beleuchtungssystem zur Ausleuchtung des Sichtfeldes der Kamera auf. Bei der Kamera handelt es sich um eine CCD Kamera.The publication DE 100 30 572 A1 shows a registration system for a web-processing machine with a sensor system for detecting registration marks. The registration control system has a control unit for controlling the transport of the web as a function of the detection of the registration marks by the sensor system. The sensor system has at least one camera and an illumination system for illuminating the field of view of the camera. The camera is a CCD camera.

Das Patent JP 58-190703 zeigt einen Registermarkensensor für eine Druckmaschine. Dabei ist eine lichtempfindliche Oberfläche zur Erfassung von Registermarken mittels einer horizontalen und einer schrägen Linie in vier Gebiete unterteilt, wobei sich die horizontale Linie und die schräge Linie in der Mitte der kreisrund gestalteten lichtempfindlichen Oberfläche schneiden. Die lichtempfindliche Oberfläche wird dabei aus vier Fiberglaselementen gebildet, welche gebündelt sind.The patent JP 58-190703 shows a register mark sensor for a printing press. Here, a photosensitive surface for detecting register marks is divided into four areas by means of a horizontal and an oblique line, with the horizontal line and the oblique line intersecting at the center of the circularly shaped photosensitive surface. The photosensitive surface is formed from four fiberglass elements, which are bundled.

Es ist Aufgabe der vorliegenden Erfindung, Registersensoren zu schaffen, welche eine zuverlässige optische Erkennung der Registerabweichung von allen druckbeteiligten Farben relativ zueinander ermöglichen.It is an object of the present invention to provide register sensors which enable a reliable optical recognition of the register deviation of all the intensively involved colors relative to each other.

Die Aufgabe wird erfindungsgemäß durch die Patentansprüche 1 und 4 gelöst. Weitere vorteilhafte Ausgestaltungen der Erfindung sind den Unteransprüchen und den Zeichnungen zu entnehmen.The object is achieved by the claims 1 and 4. Further advantageous embodiments of the invention are described in the dependent claims and the drawings.

Die neue Zweiquadranten-Fotodiode zeigt eine Anordnung von zwei lichtempfindlichen Elementen, auf die durch eine Optik ein zu beleuchtendes Feld, welches auf den Bedruckstoff vorhanden ist, abgebildet wird. Ein solches Feld ist eine auf dem Bedruckstoff aufgebrachte Registermarke. Die lichtempfindlichen Elemente wandeln dabei die Abbildung des beleuchteten Feldes in elektrische Signale um, welche in einer nachgeschalteten Elektronik wie z. B. einem Steuerungsrechner der Druckmaschine oder einer separaten Messelektronik in eine Messgröße umgerechnet werden, welche eine Maß für die Größe der Registerabweichung ist. Je nach dem wie viele Messfelder auf zueinander relativ angeordneten Farbauszügen auf dem Bedruckstoff vorhanden sind, sind mehrere Messdurchläufe nötig. Mittels der Zweiquadranten-Fotodiode als Registersensor ist somit eine zuverlässige Erkennung und Berechnung der Registerabweichung zwischen wenigstens zwei Farbauszügen auf dem Bedruckstoff möglich.The new two-quadrant photodiode shows an arrangement of two photosensitive elements onto which a field to be illuminated, which is present on the printing material, is imaged by means of an optical system. Such a field is a register mark applied to the printing substrate. The photosensitive elements convert the image of the illuminated field into electrical signals, which in a downstream electronics such. B. a control computer of the printing press or a separate measuring electronics are converted into a measured variable, which is a measure of the size of the register deviation. Depending on how many measuring fields are present on relatively spaced color separations on the substrate, several measurement runs are necessary. By means of the two-quadrant photodiode as a register sensor is thus a reliable detection and calculation of the register deviation between at least two color separations on the substrate possible.

Es ist weiterhin vorgesehen, dass die weitgehend rechteckförmigen Auswerteflächen der Zweiquadranten-Fotodiode schräg in Bezug auf Kanten des geförderten Bedruckstoffes ausgerichtet sind. Da die Kanten der Registermarken auf dem Bedruckstoff meistens nicht parallel zu den Kanten des Bedruckstoffs verlaufen, sondern als schräge Keile ausgebildet sind, kann mit einer schräg angeordneten Fotodiode die Erkennung dieser schrägen Kanten verbessert werden. Damit werden zwar parallel an den Kanten des Bedruckstoffes ausgerichtete Linien schlechter erkannt, jedoch kann durch die verbesserte Erkennung der schrägen Kanten insgesamt eine gleichmäßigeres Signal erreicht werden. So kann die Fotodiode so ausgerichtet werden, dass das Signal sowohl bei schrägen als auch bei parallel ausgerichteten Kanten der Registermarken ungefähr gleich ausfällt.It is further provided that the largely rectangular evaluation surfaces of the two-quadrant photodiode are aligned obliquely with respect to edges of the conveyed printing material. Since the edges of the register marks on the substrate usually do not run parallel to the edges of the printing material, but are formed as oblique wedges, the detection of these oblique edges can be improved with an obliquely arranged photodiode. In order for lines aligned parallel to the edges of the printing material to be recognized worse, however, can be achieved by the improved detection of the oblique edges a total of a smoother signal. Thus, the photodiode can be aligned so that the signal is approximately the same for both oblique and parallel aligned edges of the register marks.

In einer weiteren Ausgestaltung der Erfindung ist vorgesehen, dass der Registersensor eine Vierquadranten-Fotodiode ist, deren Messflächen wenigstens zum Teil schräge Kanten aufweisen. Mit einer solchen Vierquadranten-Fotodiode ist es im Gegensatz zur parallel oder schräg ausgerichteten Zweiquadranten-Fotodiode möglich, sowohl schräge als auch gerade Kanten optimal zu erkennen. Dazu weist die Fotodiode vier Messfelder auf, welche einmal senkrecht und einmal schräg geteilt sind. Mit einer entsprechenden Verschaltung der Auswerteelektronik kann so eine optimale Erkennung von parallel als auch schräg ausgerichteten Registermarken erreicht werden.In a further embodiment of the invention, it is provided that the register sensor is a four-quadrant photodiode whose measuring surfaces have at least partially oblique edges. With such a four-quadrant photodiode, in contrast to the parallel or obliquely oriented two-quadrant photodiode, it is possible to optimally recognize both oblique and straight edges. For this purpose, the photodiode four measuring fields, which are once divided vertically and once obliquely. With a corresponding interconnection The evaluation electronics can thus be achieved an optimal detection of parallel as well as obliquely aligned register marks.

Des Weiteren ist vorgesehen, dass der Registersensor ein CCD-Bildwandler ist, dessen Signale mittels einer bildverarbeitenden Elektronik ausgewertet und dem Rechner zugeführt werden. Anstelle der Fotodioden werden hier bildgebende Elemente verwendet, welche die Signale an eine bildverarbeitende Elektronik abgeben. Die CCD-Bildwandler arbeiten somit als Videokamera, welche die parallel oder schräg ausgerichteten Kanten der Registermarken erfasst, wobei das von der Kamera erfasste Bild in der bildverarbeitenden Elektronik mittels entsprechender Algorithmen so aufgearbeitet wird, dass die Lage der parallelen und schrägen Kanten der Registermarken dem Rechner der Bedruckstoffe verarbeitenden Maschine übermittelt werden kann. Auch so ist eine zuverlässige Erkennung von Registermarken möglich.Furthermore, it is provided that the register sensor is a CCD imager whose signals are evaluated by means of image processing electronics and fed to the computer. Instead of the photodiodes imaging elements are used here, which deliver the signals to an image processing electronics. The CCD image converter thus work as a video camera, which detects the parallel or obliquely oriented edges of the register marks, wherein the image captured by the camera in the image processing electronics is processed by appropriate algorithms so that the position of the parallel and oblique edges of the register marks the computer the printing material processing machine can be transmitted. Even so, reliable detection of register marks is possible.

Die vorliegende Erfindung wird nun anhand mehrerer Figuren näher beschrieben und erläutert:

Fig. 1:
eine Druckmaschine mit einer Inlinemessvorrichtung und Registersensoren,
Fig. 2:
eine zur Vorderkante des Bedruckstoffs parallel ausgerichtete Zweiquadranten-Fotodiode,
Fig. 2
a eine schräg zur Vorderkante des Bedruckstoffs ausgerichtete Zweiquadranten-Fotodiode,
Fig. 3
eine Vierquadranten-Fotodiode zur Erkennung von geraden und schrägen Kanten.
The present invention will now be described and explained in more detail with reference to several figures:
Fig. 1:
a printing machine with an inline measuring device and register sensors,
Fig. 2:
a two-quadrant photodiode aligned parallel to the leading edge of the printing substrate,
Fig. 2
a two-quadrant photodiode oriented obliquely to the front edge of the printing substrate,
Fig. 3
a four-quadrant photodiode for detecting straight and oblique edges.

Die Druckmaschine 1 in Fig. 1 ist eine Bogenrotationsdruckmaschine mit einem Anlegermodul 2 zur Förderung von Druckbogen 705 aus einem Bogenstapel in die Druckmaschine 1 sowie mit einem Ausleger 3 am anderen Ende der Druckmaschine 1, welcher die bedruckten Druckbogen 705 stapelt. Dazwischen liegen in Fig. 1 vier Druckwerke 4, 5, wobei das in Bogentransportrichtung letzte Druckwerk 5 mit einer Inlinemessvorrichtung ausgerüstet ist. Grundsätzlich ist jede Anzahl von Druckwerken 4, 5 vorstellbar, wobei die Inlinemessvorrichtung nicht notwendiger Weise im letzten Druckwerk 5 installiert sein muss. Die Inlinemessvorrichtung 6 dient in erster Linie zur spektralen Vermessung des Druckkontrollstreifen auf den Druckbögen 705 nach dem Durchlaufen der Druckmaschine 1, um eine automatische Farbregelung vornehmen zu können. In Fig. 1 sind an der Inlinemessvorrichtung 6, welche die Form eines Messbalkens aufweist, zwei Registersensoren 15 angebracht, wobei diese Registersensoren 15 grundsätzlich auch in den Messbalken 6 integriert sein können. Die Registersensoren 15 sind in den Randbereichen angebracht, so dass sie jeweils den längs in Bogenlaufrichtung seitlichen Randbereich der Bogen 705 erfassen. Wenn in der Druckmaschine keine Inlinemessvorrichtung 6 vorhanden ist, so sind die Registersensoren 15 mittels einer separaten Aufhängung im Druckwerk 5 über dem Transportweg der Druckbogen 705 angebracht. Wichtig ist, dass die Registersensoren 15 so nahe am Bogentransportpfad angebracht sind, dass sie die Registermarken auf den Druckbogen 705 problemlos erkennen können und andererseits nicht zu nah angeordnet sind, so dass die Druckbogen 705 die Registersensoren 15 nicht berühren und dadurch verschmutzen oder beschädigen. In der Ausführungsform gemäß Fig. 1 sind die Sensoren 15 jedoch am Messbalken 6 der Inlinemessvorrichtung angebracht und mit diesem zusammen entnehmbar, welcher wiederum in der Nähe des Druckspaltes 100 des letzten Druckwerks 5 eingebaut ist. Dies bietet den Vorteil, dass der Druckbogen 705 bei der Messung durch den Inlinemessbalken 6 oder die Registersensoren 15 immer von dem Druckspalt 100, welcher aus einem Druckzylinder 8 und einem Gegendruckzylinder 7 gebildet wird, sowie von den Bogengreifern 101 des Gegendruckzylinders 7 gehalten wird und somit zur Messung stabilisiert wird. Die Druckwerke 4, 5 der Druckmaschine 1 weisen jeweils Seitenwände 14 auf, in denen die Druckzylinder 7, 8 gelagert sind. Außerdem weist jedes der Druckwerke 4, 5 ein Farbwerk 13 auf. Zur Steuerung der gesamten Druckmaschine 1 ist ein Rechner 10 vorhanden, welcher zum einen Einstellkommandos an die Druckmaschine 1 übermittelt und zum anderen die Druckmaschine 1 überwacht, indem laufend Messwerte aus der Inlinemessvorrichtung 6 und den Registersensoren 15 an den Rechner 10 übermittelt werden. Somit sind die Registersensoren 15 in die Steuerung und Regelung der Druckmaschine 1 eingebunden, so dass während des Druckprozesses auftretende Registerabweichungen zwischen einzelnen Farbauszügen auf dem Druckbogen 705 durch den Rechner 10 ausgeregelt werden können.The printing press 1 in Fig. 1 is a sheet-fed rotary printing machine with a feeder module 2 for conveying printed sheets 705 from a stack of sheets in the printing machine 1 and with a boom 3 at the other end of the printing machine 1, which stacks printed printed sheets 705. In between lie in Fig. 1 four printing units 4, 5, wherein in the sheet transport direction last printing unit 5 is equipped with an inline measuring device. In principle, any number of printing units 4, 5 is conceivable, wherein the inline measuring device does not necessarily have to be installed in the last printing unit 5. The inline measuring device 6 is used primarily for the spectral measurement of the print control strip on the signatures 705 after passing through the printing press 1 in order to be able to carry out automatic color control. In Fig. 1 At the inline measuring device 6, which has the form of a measuring beam, two register sensors 15 are mounted, wherein these register sensors 15 can in principle also be integrated in the measuring beam 6. The register sensors 15 are mounted in the edge regions, so that they respectively detect the longitudinal edge region of the sheets 705 in the direction of sheet travel. If no inline measuring device 6 is present in the printing machine, the register sensors 15 are attached by means of a separate suspension in the printing unit 5 over the transport path of the printed sheets 705. It is important that the register sensors 15 are mounted so close to the sheet transport path that they can easily recognize the register marks on the print sheet 705 and on the other hand are not placed too close, so that the printed sheets 705 do not touch the register sensors 15 and thereby pollute or damage. In the embodiment according to Fig. 1 However, the sensors 15 are on the measuring beam 6 of Inline measuring device mounted and removable together with this, which in turn is installed in the vicinity of the printing nip 100 of the last printing unit 5. This offers the advantage that the printed sheet 705 is always held by the printing gap 100, which is formed by a printing cylinder 8 and a counter-pressure cylinder 7, as well as by the sheet grippers 101 of the impression cylinder 7 during the measurement by the inline measuring bar 6 or the register sensors 15 and thus is stabilized for measurement. The printing units 4, 5 of the printing machine 1 each have side walls 14, in which the printing cylinders 7, 8 are mounted. In addition, each of the printing units 4, 5 an inking unit 13. To control the entire printing machine 1, a computer 10 is present, which transmits setting commands to the printing machine 1 and monitors the printing machine 1 by constantly transmitting measured values from the inline measuring device 6 and the register sensors 15 to the computer 10. Thus, the register sensors 15 are involved in the control and regulation of the printing machine 1, so that occurring during the printing process register deviations between individual color separations on the print sheet 705 can be compensated by the computer 10.

Eine erste Ausführungsform der Registersensoren 15 ist in Fig. 2 zu sehen, welcher als Zweiquadranten-Fotodiode aufgebaut ist. Normalerweise sind zwei Registersensoren 15 in den seitlichen Bereichen des Druckwerks 5 angebracht, so dass sie die Randbereiche des Druckbogens 705 mit den Registermarken abtasten können. Die zwei Quadranten der Fotodiode des Registersensors 15 sind dabei rechteckförmig ausgebildet und parallel zu der Vorderkante des durch die Druckmaschine 1 geförderten Druckbogens 705 ausgerichtet. Die beiden Flächen des Registersensors 15 sind so verschaltet, dass die Differenz der Signale dem Rechner 10 zugeführt wird. Mittels der Ausführungsform gemäß Fig. 2a ist es möglich, das Ausgangssignal des Sensors 15 zur Erkennung schräger Kanten zu verbessern. Dazu ist die Fotodiode schräg zur Vorderkante des Druckbogens 705 ausgerichtet, um die schrägen Kanten von Registermarken besser erkennen zu können. Auch wenn dadurch dann waagrechte Kanten der Registermarken schlechter erkannt werden, so führt die schräge Anordnung gemäß Fig. 2a doch zu einem gleichmäßigeren Signal, was die Erfassung der Lage der Registermarken insgesamt verbessert.A first embodiment of the register sensors 15 is shown in FIG Fig. 2 to see which is constructed as a two-quadrant photodiode. Normally, two register sensors 15 are mounted in the lateral areas of the printing unit 5, so that they can scan the edge areas of the print sheet 705 with the register marks. The two quadrants of the photodiode of the register sensor 15 are rectangular in shape and aligned parallel to the front edge of the conveyed by the printing press 1 sheet 705. The two surfaces of the register sensor 15 are connected so that the difference of the signals is supplied to the computer 10. By means of the embodiment according to Fig. 2a it is possible to improve the output signal of the sensor 15 for detecting oblique edges. For this purpose, the photodiode is aligned obliquely to the front edge of the print sheet 705 in order to better recognize the oblique edges of register marks. Even if it then horizontal edges of the register marks are recognized worse, so leads the oblique arrangement according to Fig. 2a but to a more uniform signal, which improves the detection of the position of the register marks overall.

Eine weitere Ausführungsform gemäß Fig. 3 verbindet die Vorteile bei der Erkennung gerader und schräger Kanten von Registermarken miteinander. Dazu weist der Registersensor 15 eine Vierquadranten-Fotodiode auf, welche eine gerade und eine schräge Unterteilung aufweisen. Mittels der angeschrägten Registersensorflächen 16 ist es möglich, schräge Kanten hervorragend zu erkennen, wobei durch die gerade Unterteilung auch gerade Kanten sehr gut erkannt werden können. Zur Erkennung schräger Kanten werden dabei die Signale der Flächen 16.1 und 16.3 im Rechner 10 summiert sowie die Signale der Flächen 16.2 und 16.4. Zur Erkennung gerader Kanten werden dagegen die Signale 16.1 und 16.2 summiert sowie die Signale 16.3 und 16.4. Die aus den Summiervorgängen resultierenden beiden Signale werden dann subtrahiert. Der Rechner 10 hat daher vier Eingänge für die vier Felder der Vierquadranten-Fotodiode des Registersensors 15. Die Elektronik zur Auswertung des Registersensors 15 kann allerdings auch außerhalb des Rechners 10 direkt im Sensor 15 oder dem Messbalken 6 untergebracht sein, wobei dann die Elektronik noch zwei Ausgänge für gerade und schräge Kanten aufweist, deren Signale an den Rechner 10 weitergegeben werden.A further embodiment according to Fig. 3 combines the advantages of detecting straight and oblique edges of register marks. For this purpose, the register sensor 15 has a four-quadrant photodiode which has a straight and an oblique subdivision. By means of the tapered register sensor surfaces 16, it is possible to recognize oblique edges outstanding, with the straight subdivision even straight edges can be very well recognized. To detect oblique edges while the signals of the surfaces 16.1 and 16.3 are summed in the computer 10 and the signals of the surfaces 16.2 and 16.4. For the detection of straight edges, however, the signals 16.1 and 16.2 are summed and the signals 16.3 and 16.4. The two signals resulting from the summing operations are then subtracted. The computer 10 therefore has four inputs for the four fields of the four-quadrant photodiode of the register sensor 15. However, the electronics for evaluation of the register sensor 15 may be located outside the computer 10 directly in the sensor 15 or the measuring beam 6, in which case the electronics two more Outputs for straight and oblique edges, the signals are passed to the computer 10.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Druckmaschinepress
22
Anlegermodulinvestors module
33
Auslegermoduldelivery module
44
Druckwerkprinting unit
55
Druckwerk mit InlinemessvorrichtungPrinting unit with inline measuring device
66
InlinemessvornchtungInlinemessvornchtung
77
GegendruckzylinderImpression cylinder
88th
Druckzylinderpressure cylinder
99
Transportzylindertransport cylinder
1010
Rechnercomputer
1313
Farbwerkinking
1414
SeitenwandSide wall
1515
Registersensorregister sensor
1616
angeschrägte Registersensorflächetapered register sensor surface
100100
Druckspaltnip
101101
Bogengreifersheet grippers
705705
Druckbogensheet

Claims (4)

  1. Device in a machine (1) processing printing material comprising a register sensor (15) for measuring the register between at least two colour separations of a printed image that have been printed on top of each other and are present on a printing material (705), the register sensor (15) optically detecting the deviations between two colour separations on top of each other on the printing material (705) and forwarding them to a computer (10),
    characterized in
    that the register sensor (15) comprises at least one photodiode with at least two quadrants and that the evaluation surfaces of the photodiode (15), which are essentially rectangular, are aligned at an angle relative to the edges of the conveyed printing material (705).
  2. Device according to Claim 1,
    characterized in
    that the register sensor (15) is a four-quadrant photodiode whose measuring surfaces at least in part have angled edges.
  3. Device according to Claim 1 or 2,
    characterized in
    that the register sensor (15) is a CCD image converter whose signals are evaluated by an electronic image processing system and fed to the computer (10).
  4. Printing press (1) including a register sensor (15) according to one of Claims 1 to 3.
EP05102757A 2004-05-03 2005-04-07 Register sensor Active EP1593508B1 (en)

Applications Claiming Priority (2)

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DE102004021597 2004-05-03
DE102004021597.9A DE102004021597B4 (en) 2004-05-03 2004-05-03 registration mark

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EP1593508A2 EP1593508A2 (en) 2005-11-09
EP1593508A3 EP1593508A3 (en) 2006-07-05
EP1593508B1 true EP1593508B1 (en) 2012-08-29

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US (2) US7637210B2 (en)
EP (1) EP1593508B1 (en)
JP (1) JP2005319801A (en)
CN (1) CN100526072C (en)
DE (1) DE102004021597B4 (en)

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Also Published As

Publication number Publication date
JP2005319801A (en) 2005-11-17
CN1693075A (en) 2005-11-09
US20100007690A1 (en) 2010-01-14
CN100526072C (en) 2009-08-12
DE102004021597A1 (en) 2005-12-08
US7637210B2 (en) 2009-12-29
DE102004021597B4 (en) 2017-04-13
EP1593508A3 (en) 2006-07-05
US20050249380A1 (en) 2005-11-10
EP1593508A2 (en) 2005-11-09
US8161876B2 (en) 2012-04-24

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