EP0860276B1 - Device and method for quality control - Google Patents

Device and method for quality control Download PDF

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Publication number
EP0860276B1
EP0860276B1 EP97121396A EP97121396A EP0860276B1 EP 0860276 B1 EP0860276 B1 EP 0860276B1 EP 97121396 A EP97121396 A EP 97121396A EP 97121396 A EP97121396 A EP 97121396A EP 0860276 B1 EP0860276 B1 EP 0860276B1
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EP
European Patent Office
Prior art keywords
measuring
assigned
printing machine
web
rotational roller
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Expired - Lifetime
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EP97121396A
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German (de)
French (fr)
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EP0860276A1 (en
Inventor
Andreas Birkenfeld
Karl-Heinz Reichel-Langer
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Baldwin Germany GmbH
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Baldwin Germany GmbH
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply

Definitions

  • the invention relates to an apparatus and a method for carrying it out of quality management when printing with a web-fed rotary press.
  • EP 0741 032 A2 also discloses a web-fed rotary printing press a measuring head that is adjustable over the width of the printing material web comprises a CCD sensor and a flash device and by means of a the encoder assigned to the web-fed rotary printing press, depending on the product can be activated, and with a control device with an input for Measuring signals from the measuring head.
  • This arrangement is used to control the Ink metering device of the web-fed rotary printing machine depending on Measured values recorded during printing.
  • test patterns are scanned that are located on a specific point in the area of the front or rear edge of the Printed image. Accordingly, the measuring head is not adjustable.
  • the CCD sensors provided in the known arrangement can Record color density. The acquisition of the spectral distribution is not intended. The known arrangement is therefore for subsequent Providing an exact proof of quality is not suitable.
  • the encoder As a result of the lateral adjustability of the measuring heads and their triggering Thanks to the encoder, practically any position on the printed web can be achieved can be achieved. It is therefore possible to select critical area and assign a measuring head to it. The measurement takes place via the entire visible spectrum, so that even in the intermediate areas high accuracy can be achieved between the three basic colors. Since the measured values continuously recorded and recorded are in advantageously an exact control and in particular an exact one Proof of quality possible, provided the customer subsequently checks the quality should complain about what is common when printing large-format advertisements etc. should occur. The storage of the measured values over the whole Production time advantageously allows after the end of Production various representations from which existing ones Deviations are recognizable at a glance.
  • Figure 1 is a web-fed rotary printing press represented only by its last printing unit 1 indicated, by means of which a printing material web 2 is printed.
  • the web-fed rotary printing press 1 can be trade an offset web press. The construction and the The mode of operation of such machines is known per se and requires it therefore no further explanation in the present context.
  • the web-fed rotary printing press 1 is followed by a dryer 3 a cooling device, not shown here, can be arranged downstream. Subsequently, the printing material web 2 only runs through one here a folder 4 indicated.
  • Cooling device and the folder 4 passes through the printing material web 2 here consisting of several measuring heads 5 measuring device. to Avoid a strong path deflection by flutter etc. Measuring device a comparatively short, by two deflection rollers 6th limited path section assigned.
  • the measuring heads 5 With the help of the measuring heads 5 in selected points or point areas 7 of the periodically recurring on the substrate 2 The color density and the spectral distribution at the same time measured by color.
  • the measuring heads can be moved laterally Traverses 8 running transversely to the running direction of the printing material web 2 arranged and manually and / or by assigned drive motors adjustable along the traverses 8. To the assigned measuring point reach, the measuring heads 5 along the associated crossmember 8 accordingly the lateral coordinate of the assigned measuring point postponed.
  • the measuring point is one of the Web-fed rotary printing press 1, high-resolution encoder 9 given that the trigger point for triggering each measuring head 5 am delivers the respective measuring point.
  • the measuring heads 5 contain a spectrometer that simultaneously with each triggering the color density and spectral distribution of the color in the assigned measuring field 7 detected.
  • the trigger occurs every time that on the printing material web 2 periodically recurring measuring field 7 under the assigned measuring head 5 passes.
  • the measuring heads 5 also an exposure device. This can be as constantly shining Quartz lamp or preferably as together with the spectrometer periodically triggerable flash should be formed, which is a high light intensity results in a comparatively low energy requirement.
  • a control device is assigned to the measuring device.
  • This includes a recording memory 10 containing the signals of the Receiving encoder 9 and an interface to the operator, for example in the form of an input keyboard 11 having central unit 12 and a subordinate subunit 13, which can be controlled by this, for local Operation of the measuring heads 5.
  • the central unit 12 With the help of the central unit 12 are based on the commands provided by the operator and the encoder 9 Control signals for setting and activating the measuring heads 5 are determined.
  • the Operator gives practically only the coordinates of each Measuring point.
  • the control signals mentioned go via the signal line 14 to the subordinate subunit 13 through which the measuring heads 5 be served locally. To shorten the lateral adjustment of the Measuring heads 5 can be manually preset so that then only a fine motor adjustment is necessary.
  • the subunit 13 at the same time the measuring heads 5 supplied data processed so that they have a suitable interface can be transferred to the central unit 12. In the example shown, this is due to the pointing in both directions Arrows of the signal line 14 indicated.
  • the to the central unit 12 Data transferred are processed by the central unit 12 according to color density and spectral distribution processed and in the recording memory 10 on the Duration of production saved continuously.
  • Another measure to achieve high accuracy is in that the measurement results influence temperature fluctuations be balanced.
  • the subunit 13 assigned compensation device 15a is provided, which the in Measuring range occurring temperature fluctuations after a can computationally compensate for the specified program.
  • the Temperature detection can take place via the dark values of the measuring heads 5, so that additional temperature sensors are not required.
  • the measuring heads 5 each provided with a tubular housing, which with its front opening is made close to the paper web 2, so that only there is a small gap through which little false light can penetrate.
  • the diameter of the tubular housing Measuring heads 5 selected larger than the diameter of the detectable measuring field, whereby the intensity of what is still present in the area of the measuring field Is weakened in the wrong light.
  • the strength of the Exposure device emitted light set very high, which the effect of false light loses importance.
  • the current values of the measurements carried out by the measuring heads 5 may be appropriate after appropriate adjustment displayed. For this is one of the central unit 12 of the control device controllable display device 16 is provided. Each measuring head 5 can be assigned a separate display field.
  • the central unit 12 of the control device is also linked to the control device 17 of the web-fed rotary printing press 1, as indicated by the signal line 18.
  • control device 17 can take countermeasures be initiated, e.g. can affect the setting of the inking units are, as indicated in Figure 1 by a signal line 19.
  • an alarm device 20 for alarming the Printing personnel are operated. It is of course also possible to mark affected products by applying a suitable color Spray nozzles can be opened or discarded by the Waste gates are opened.
  • FIG. 2 This diagram shows the Development of the color over the printing period.
  • the point 21 characterizes practically the ideal value.
  • the field 22 surrounding point 21 characterizes the spectral range within which the color moves Has. Here you can see at a glance whether a tolerance range, for example inform of a circle drawn around point 21, has been observed or not.
  • FIG. 3 Another option is to develop color density over time record.
  • Such a time-density diagram is shown in FIG. 3 based.
  • the courses of the color densities are three basic colors specified above the production time. Lines 23 characterize the ideal course.
  • the curves 24 show the actual course.
  • FIG. 4 contains a spectral distribution curve 25, from which the spectral distribution of all colors occurring in the assigned measuring range over the entire visible spectrum. The spectral Distribution of individual measurements or integration over several or all measurements are displayed.
  • the invention thus forms an important element of a reliable one Quality management.
  • the invention offers the possibility of the quality produced can also be proven retrospectively, whereby unjustified complaints can be reasonably countered.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Description

Die Erfindung betrifft eine Vorrichtung und ein Verfahren zur Durchführung von Qualitätsmanagement beim Drucken mit einer Rollenrotationsdruckmaschine.The invention relates to an apparatus and a method for carrying it out of quality management when printing with a web-fed rotary press.

In der Praxis ist es bisher üblich, von Zeit zu Zeit ein Probeexemplar zu entnehmen und zu vermessen. Eine lückenlose Erfassung der gedruckten Exemplare ist somit nicht gegeben. Darüber hinaus besteht eine Unsicherheit bezüglich der Zuordnung der Ergebnisse zum Produktionsfortgang, da eine Kennzeichnung der Exemplare nicht automatisch erfolgt.In practice it has so far been customary to send a sample from time to time remove and measure. A complete recording of the printed No copies are given. There is also an uncertainty regarding the allocation of the results to the production progress, since a Marking of the copies is not done automatically.

Für Bogenrotationsdruckmaschinen ist bereits ein in einer Verlängerung der Bogenauslage angeordnetes Bogeninspektionssystem vorgeschlagen worden, bei dem jeder ausgelegte Bogen mittels mehrerer Videokameras fotografiert und mit einem sogenannten Masterbogen verglichen wird. Abweichungen der produzierten Qualität von der Qualität des Masterbogens werden angezeigt. Im Falle unzulässiger Abweichungen kann eine Markierung oder Aussonderung der betreffenden Bogen erfolgen. Eine Protokollierung der gemessenen Werte erfolgt nicht.For sheet-fed rotary printing presses, one is already in an extension of the Sheet inspection system arranged sheet inspection system proposed in which each sheet is laid out by means of several video cameras photographed and compared with a so-called master sheet. Deviations in the quality produced from the quality of the master sheet are shown. In the event of impermissible deviations, a Marking or discarding the sheets in question. A The measured values are not logged.

Die Arbeitsgeschwindigkeit der hier verwendeten Videokameras, die praktisch den ganzen Bogen erfassen, ist vergleichsweise gering. Schon aus diesem Grund ist die bekannte Anordnung für Rollenrotationsdruckmaschinen nicht geeignet. Bei einer Bogenrotationsdruckmaschine spielt die vergleichsweise geringe Arbeitsgeschwindigkeit der Videokameras weniger Rolle, da hier ohnehin nur vergleichsweise geringe Produktionsgeschwindigkeiten erreicht werden. Hinzu kommt, daß mit Videokameras die spektrale Verteilung mit vertretbarem Aufwand nicht erfassbar ist. Es werden daher nur die Grundfarben erfasst. Hierzu sind entsprechende Filter vorgesehen. Die Zwischenbereiche zwischen den drei Grundfarben müssen interpoliert werden. Dies führt jedoch zu einer vergleichsweise großen Ungenauigkeit. The working speed of the video cameras used here, the practically covering the entire arc is comparatively small. Already out for this reason, the known arrangement for web-fed rotary printing presses not suitable. With a sheet-fed rotary printing press that plays comparatively low working speed of the video cameras less Role, because here only comparatively small Production speeds can be achieved. On top of that with Video cameras do not do the spectral distribution with reasonable effort is detectable. Therefore only the primary colors are recorded. For this are appropriate filters are provided. The intermediate areas between the three Basic colors have to be interpolated. However, this leads to a comparatively large inaccuracy.

Aus der EP 0741 032 A2 ergibt sich eine Rollenrotationsdruckmaschine mit einem über der Breite der Bedruckstoffbahn verstellbaren Messkopf, der einen CCD-Sensor und eine Blitzlichteinrichtung umfasst und mittels eines der Rollenrotationsdruckmaschine zugeordneten Encoders produktabhängig aktivierbar ist, und mit einer Steuereinrichtung mit einem Eingang für die Messsignale des Messkopfes. Diese Anordnung dient zur Steuerung der Farbdosiereinrichtung der Rollenrotationsdruckmaschine in Abhängigkeit von während des Drucks aufgenommenen Messwerten. Bei der bekannten Anordnung werden hierzu Testbilder abgetastet, die sich an einer bestimmten Stelle im Bereich des vorderen oder hinteren Rands des Druckbilds befinden. Der Messkopf ist dementsprechend nicht verstellbar. Die bei der bekannten Anordnung vorgesehenen CCD-Sensoren können die Farbdichte erfassen. Die Erfassung der spektralen Verteilung ist nicht vorgesehen. Die bekannten Anordnung ist daher zur nachträglichen Erbringung eines exakten Qualitätsnachweises nicht geeignet.EP 0741 032 A2 also discloses a web-fed rotary printing press a measuring head that is adjustable over the width of the printing material web comprises a CCD sensor and a flash device and by means of a the encoder assigned to the web-fed rotary printing press, depending on the product can be activated, and with a control device with an input for Measuring signals from the measuring head. This arrangement is used to control the Ink metering device of the web-fed rotary printing machine depending on Measured values recorded during printing. With the known For this purpose, test patterns are scanned that are located on a specific point in the area of the front or rear edge of the Printed image. Accordingly, the measuring head is not adjustable. The CCD sensors provided in the known arrangement can Record color density. The acquisition of the spectral distribution is not intended. The known arrangement is therefore for subsequent Providing an exact proof of quality is not suitable.

Aus der EP 0228 347 A1 ergibt sich eine Vorrichtung zur Farbauftragssteuerung bei einer Bogenrotationsdruckmaschine. Bei dieser bekannten Anordnung ist zwar ein verstellbarer Messkopf vorgesehen, der jedoch nur mit einem Spektrometer zur Aufnahme der spektralen Verteilung ausgestattet ist. Von der Farbdichte abhängige Messwerte werden nicht aufgenommen. Auch hiermit ist ein nachträglicher, exakter Qualitätsnachweis nicht erbringbar.From EP 0228 347 A1 a device for Ink job control in a sheet-fed rotary printing press. At this known arrangement an adjustable measuring head is provided, the but only with a spectrometer to record the spectral distribution Is provided. Measured values dependent on the color density are not added. This is also a subsequent, exact proof of quality not feasible.

Es ist die Aufgabe der vorliegenden Erfindung, eine Vorrichtung und ein Verfahren für Qualitätsmanaging bei Rollenrotationsdruckmaschinen so auszubilden, daß eine Inline-Messung ohne Beschränkung der Produktionsgeschwindigkeit sowie eine hohe Genauigkeit gewährleistet sind.It is the object of the present invention, an apparatus and a Process for quality management in web-fed rotary printing presses train that an inline measurement without limitation of the Production speed and high accuracy are guaranteed.

Die vorrichtungsmäßige Lösung dieser Aufgabe ist im Anspruch 1, und die Verfahrensmäßige Lösung ist im Anspruch 8 angegeben.The device-related solution to this problem is in claim 1, and the procedural solution is in claim 8 specified.

Infolge der seitlichen Verstellbarkeit der Meßköpfe und ihrer Triggerung durch den Encoder kann praktisch jede Position auf der bedruckten Bahn erreicht werden. Es ist daher möglich, kritische Bereich auszuwählen und diesen einen Meßkopf zuzuordnen. Die Messung erfolgt dabei über das gesamte sichtbare Spektrum, so daß auch in den Zwischenbereichen zwischen den drei Grundfarben hohe Genauigkeiten erreicht werden. Da die gemessenen Werte fortlaufend erfaßt und aufgezeichnet werden, sind in vorteilhafter Weise eine exakte Kontrolle und insbesondere ein exakter Qualitätsnachweis möglich, sofern der Kunde nachträglich die Qualität beanstanden sollte, was beim Druck großflächiger Anzeigen etc. vielfach vorkommen soll. Die Speicherung der Meßwerte über der ganzen Produktionsdauer ermöglicht in vorteilhafter Weise nach Beendigung der Produktion verschiedene Darstellungen, aus denen vorhandene Abweichungen auf einen Blick erkennbar sind. Gleichzeitig ist es aber auch möglich, die Meßergebnisse schon während der laufenden Produktion zu überwachen und im Falle von Überschreitungen von vorher festgelegten Toleranzgrenzen so einzugreifen, daß die vorgegebenen Toleranzen wieder eingehalten werden und Makulatur gekennzeichnet bzw. ausgesondert wird. Mit den erfindungsgemäßen Maßnahmen wird daher die oben genannte Aufgabe auf höchst wirtschaftliche Weise gelöst.As a result of the lateral adjustability of the measuring heads and their triggering Thanks to the encoder, practically any position on the printed web can be achieved can be achieved. It is therefore possible to select critical area and assign a measuring head to it. The measurement takes place via the entire visible spectrum, so that even in the intermediate areas high accuracy can be achieved between the three basic colors. Since the measured values continuously recorded and recorded are in advantageously an exact control and in particular an exact one Proof of quality possible, provided the customer subsequently checks the quality should complain about what is common when printing large-format advertisements etc. should occur. The storage of the measured values over the whole Production time advantageously allows after the end of Production various representations from which existing ones Deviations are recognizable at a glance. At the same time, it is also possible to measure the results already during production monitor and in the event of violations of predetermined ones Intervene tolerance limits so that the specified tolerances again are complied with and waste is marked or removed. With the measures according to the invention, the above is therefore mentioned Task solved in a highly economical way.

Vorteilhafte Ausgestaltungen und zweckmäßige Fortbildungen der übergeordneten Maßnahmen sind in den Unteransprüchen angegeben und aus der nachstehenden Beispielsbeschreibung anhand der Zeichnung entnehmbar.Advantageous refinements and expedient training of the parent Measures are specified in the subclaims and from the The following example description can be taken from the drawing.

In der nachstehend beschriebenen Zeichnung zeigen:

Figur 1
eine schematische Darstellung einer erfindungsgemäßen Vorrichtung mit Signalflußpfeilen,
Figur 2
ein Beispiel für eine einer Meßstelle zugeordnete Farbortdarstellung,
Figur 3
ein Beispiel für ein einer Meßstelle zugeordnetes Zeit-Dichte-Diagramm und
Figur 4
ein Beispiel für ein einer Meßstelle zugeordnetes Spektralverteilungs-Diagramm.
In the drawing described below:
Figure 1
1 shows a schematic representation of a device according to the invention with signal flow arrows,
Figure 2
an example of a color location representation assigned to a measuring point,
Figure 3
an example of a time-density diagram assigned to a measuring point and
Figure 4
an example of a spectral distribution diagram assigned to a measuring point.

In Figur 1 ist eine lediglich durch ihr letztes Druckwerk repräsentierte Rollenrotationsdruckmaschine 1 angedeutet, mittels der eine Bedruckstoffbahn 2 bedruckt wird. Bei der Rollenrotationsdruckmaschine 1 kann es sich um eine Offset-Rollenrotationsmaschine handeln. Der Aufbau und die Wirkungsweise derartiger Maschinen sind an sich bekannt und bedürfen daher im vorliegenden Zusammenhang keiner näheren Erläuterung mehr.In Figure 1 is a web-fed rotary printing press represented only by its last printing unit 1 indicated, by means of which a printing material web 2 is printed. The web-fed rotary printing press 1 can be trade an offset web press. The construction and the The mode of operation of such machines is known per se and requires it therefore no further explanation in the present context.

Der Rollenrotationsdruckmaschine 1 ist ein Trockner 3 nachgeordnet, dem eine hier nicht näher dargestellte Kühleinrichtung nachgeordnet sein kann. Anschließend läuft die Bedruckstoffbahn 2 in einen hier lediglich durch einen Falztrichter angedeuteten Falzapparat 4 ein.The web-fed rotary printing press 1 is followed by a dryer 3 a cooling device, not shown here, can be arranged downstream. Subsequently, the printing material web 2 only runs through one here a folder 4 indicated.

Im Bereich zwischen dem Trockner 3 bzw. der diesem zugeordneten Kühleinrichtung und dem Falzapparat 4 passiert die Bedruckstoffbahn 2 eine hier aus mehreren Meßköpfen 5 bestehende Meßeinrichtung. Zur Vermeidung einer starken Bahnauslenkung durch Flattern etc. ist der Meßeinrichtung ein vergleichsweise kurzer, durch zwei Umlenkwalzen 6 begrenzter Bahnabschnitt zugeordnet.In the area between the dryer 3 or the one assigned to it Cooling device and the folder 4 passes through the printing material web 2 here consisting of several measuring heads 5 measuring device. to Avoid a strong path deflection by flutter etc. Measuring device a comparatively short, by two deflection rollers 6th limited path section assigned.

Mit Hilfe der Meßköpfe 5 werden in ausgewählten Punkten bzw. Punktbereichen 7 des auf der Bedruckstoffbahn 2 periodisch wiederkehrenden Druckbilds gleichzeitig jeweils die Farbdichte und die spektrale Verteilung der Farbe gemessen. Die Meßköpfe sind hierzu seitlich verschiebbar auf quer zur Laufrichtung der Bedruckstoffbahn 2 verlaufenden Traversen 8 angeordnet und manuell und/oder durch zugeordnete Antriebsmotoren entlang der Traversen 8 verstellbar. Um den zugeordneten Meßpunkt zu erreichen, werden die Meßköpfe 5 entlang der zugeordneten Traverse 8 entsprechend der seitlichen Koordinate des zugeordneten Meßpunkts verschoben. In Umfangsrichtung wird der Meßpunkt durch einen von der Rollenrotationsdruckmaschine 1 betätigbaren, hochauflösenden Encoder 9 vorgegeben, der den Triggerpunkt zum Auslösen jedes Meßkopfes 5 am jeweils zugehörigen Meßpunkt liefert.With the help of the measuring heads 5 in selected points or point areas 7 of the periodically recurring on the substrate 2 The color density and the spectral distribution at the same time measured by color. For this purpose, the measuring heads can be moved laterally Traverses 8 running transversely to the running direction of the printing material web 2 arranged and manually and / or by assigned drive motors adjustable along the traverses 8. To the assigned measuring point reach, the measuring heads 5 along the associated crossmember 8 accordingly the lateral coordinate of the assigned measuring point postponed. In the circumferential direction, the measuring point is one of the Web-fed rotary printing press 1, high-resolution encoder 9 given that the trigger point for triggering each measuring head 5 am delivers the respective measuring point.

Die Meßköpfe 5 enthalten ein Spektrometer, das bei jeder Auslösung gleichzeitig die Farbdichte und die spektrale Verteilung der Farbe im zugeordneten Meßfeld 7 erfaßt. Die Auslösung erfolgt jedesmal, wenn das auf der Bedruckstoffbahn 2 periodisch wiederkehrende Meßfeld 7 unter dem zugeordneten Meßkopf 5 vorbeiläuft.The measuring heads 5 contain a spectrometer that simultaneously with each triggering the color density and spectral distribution of the color in the assigned measuring field 7 detected. The trigger occurs every time that on the printing material web 2 periodically recurring measuring field 7 under the assigned measuring head 5 passes.

Um eine zuverlässige Messung zu gewährleisten, enthalten die Meßköpfe 5 auch eine Belichtungseinrichtung. Diese kann als dauernd leuchtende Quarzlampe oder vorzugsweise als zusammen mit dem Spektrometer periodisch auslösbarer Blitz ausgebildet sein, was eine hohe Lichtintensität bei vergleichsweise geringem Energiebedarf ergibt.In order to ensure a reliable measurement, the measuring heads 5 also an exposure device. This can be as constantly shining Quartz lamp or preferably as together with the spectrometer periodically triggerable flash should be formed, which is a high light intensity results in a comparatively low energy requirement.

Der Meßeinrichtung ist eine Steuereinrichtung zugeordnet. Diese umfaßt eine einen Aufzeichnungsspeicher 10 enthaltende, die Signale des Encoders 9 empfangende und eine Schnittstelle zum Bediener, beispielsweise in Form einer Eingabetastatur 11 aufweisende Zentraleinheit 12 und eine von dieser ansteuerbare, nachgeordnete Untereinheit 13 zur lokalen Bedienung der Meßköpfe 5. Mit Hilfe der Zentraleinheit 12 werden anhand der durch die Bedienungsperson und den Encoder 9 gelieferten Befehle die Steuersignale zur Einstellung und Aktivierung der Meßköpfe 5 ermittelt. Die Bedienungsperson gibt dabei praktisch nur die Koordinaten des jeweiligen Meßpunkts ein. Die genannten Steuersignale gehen über die Signalleitung 14 an die nachgeordnete Untereinheit 13, durch welche die Meßköpfe 5 lokal bedient werden. Zur Abkürzung der seitlichen Einstellung der Meßköpfe 5 kann eine manuelle Voreinstellung erfolgen, so daß anschließend nur noch eine motorische Feineinstellung nötig ist.A control device is assigned to the measuring device. This includes a recording memory 10 containing the signals of the Receiving encoder 9 and an interface to the operator, for example in the form of an input keyboard 11 having central unit 12 and a subordinate subunit 13, which can be controlled by this, for local Operation of the measuring heads 5. With the help of the central unit 12 are based on the commands provided by the operator and the encoder 9 Control signals for setting and activating the measuring heads 5 are determined. The Operator gives practically only the coordinates of each Measuring point. The control signals mentioned go via the signal line 14 to the subordinate subunit 13 through which the measuring heads 5 be served locally. To shorten the lateral adjustment of the Measuring heads 5 can be manually preset so that then only a fine motor adjustment is necessary.

Während des Betriebs werden durch die Untereinheit 13 gleichzeitig die von den Meßköpfen 5 gelieferten Daten so aufbereitet, daß sie über eine geeignete Schnittstelle an die Zentraleinheit 12 übergeben werden können. Im dargestellten Beispiel ist dies durch die in beide Richtungen weisenden Pfeile der Signalleitung 14 angedeutet. Die an die Zentraleinheit 12 übergebenen Daten werden von der Zentraleinheit 12 nach Farbdichte und spektraler Verteilung aufbereitet und im Aufzeichnungsspeicher 10 über die Dauer der Produktion laufend abgespeichert.During operation, the subunit 13 at the same time the measuring heads 5 supplied data processed so that they have a suitable interface can be transferred to the central unit 12. In the example shown, this is due to the pointing in both directions Arrows of the signal line 14 indicated. The to the central unit 12 Data transferred are processed by the central unit 12 according to color density and spectral distribution processed and in the recording memory 10 on the Duration of production saved continuously.

Um bei den von den Meßköpfen 5 durchgeführten Messungen eine hohe Genauigkeit zu gewährleisten, wird parallel zur von den Meßköpfen 5 ausgeführten Messung eine Referenzmessung ausgeführt. Die entsprechende Referenzmesseinrichtung 15 ist hier der Untereinheit 13 zugeordnet.In order to achieve a high level in the measurements carried out by the measuring heads 5 Ensuring accuracy is parallel to that of the measuring heads 5 performed measurement performed a reference measurement. The the corresponding reference measuring device 15 is here the subunit 13 assigned.

Eine weitere Maßnahme zur Erzielung einer hohen Genauigkeit besteht darin, daß die Meßergebnisse beeinflussende Temperaturschwankungen ausgeglichen werden. Hierzu ist eine ebenfalls der Untereinheit 13 zugeordnete Kompensationseinrichtung 15a vorgesehen, welche die im Meßbereich auftretenden Temperaturschwankungen nach einem vorgegebenen Programm rechnerisch ausgleichen kann. Die Temperaturerfassung kann über die Dunkelwerte der Meßköpfe 5 erfolgen, so daß zusätzliche Temperaturfühler nicht benötigt werden.Another measure to achieve high accuracy is in that the measurement results influence temperature fluctuations be balanced. For this purpose, one is also the subunit 13 assigned compensation device 15a is provided, which the in Measuring range occurring temperature fluctuations after a can computationally compensate for the specified program. The Temperature detection can take place via the dark values of the measuring heads 5, so that additional temperature sensors are not required.

Außerdem sollen durch Falschlicht verursachte Fehler weitestgehend ausgeschlossen werden. Um dies zu bewerkstelligen, werden die Meßköpfe 5 jeweils mit einem röhrenförmigen Gehäuse versehen, das mit seiner vorderen Öffnung nahe an die Papierbahn 2 angestellt wird, so daß sich nur ein geringer Spalt ergibt, durch den wenig Falschlicht eindringen kann. Gleichzeitig wird der Durchmesser der röhrenförmigen Gehäuse der Meßköpfe 5 größer als der Durchmesser des erfaßbaren Meßfeldes gewählt, wodurch die Intensität des im Bereich des Meßfeldes noch vorhandenen Falschlichts abgeschwächt wird. Außerdem wird die Stärke des von der Belichtungseinrichtung abgegebenen Lichts sehr hoch eingestellt, wodurch die Wirkung von Falschlicht an Bedeutung verliert. Zur Ausschaltung von Reflexionen bei glänzendem Hintergrund wird das Beleuchtungslicht über Glasfasern unter einem Winkel von vorzugsweise 45° zur Papieroberfläche zugeführt.In addition, errors caused by false lighting should be largely be excluded. To accomplish this, the measuring heads 5 each provided with a tubular housing, which with its front opening is made close to the paper web 2, so that only there is a small gap through which little false light can penetrate. At the same time, the diameter of the tubular housing Measuring heads 5 selected larger than the diameter of the detectable measuring field, whereby the intensity of what is still present in the area of the measuring field Is weakened in the wrong light. In addition, the strength of the Exposure device emitted light set very high, which the effect of false light loses importance. To switch off Reflections on a shiny background will illuminate the illuminating light Glass fibers at an angle of preferably 45 ° to the paper surface fed.

Die aktuellen Werte der von den Meßköpfen 5 durchgeführten Messungen werden gegebenenfalls nach entsprechender Bereinigung zweckmäßig angezeigt. Hierzu ist eine von der Zentraleinheit 12 der Steuereinrichtung steuerbare Anzeigeeinrichtung 16 vorgesehen. Jedem Meßkopf 5 kann dabei ein eigenes Anzeigefeld zugeordnet sein.The current values of the measurements carried out by the measuring heads 5 may be appropriate after appropriate adjustment displayed. For this is one of the central unit 12 of the control device controllable display device 16 is provided. Each measuring head 5 can be assigned a separate display field.

Im dargestellten Beispiel ist die Zentraleinheit 12 der Steuereinrichtung auch mit der Steuereinrichtung 17 der Rollenrotationsdruckmaschine 1 verknüpft, wie durch die Signalleitung 18 angedeutet ist. Hierdurch kann an die Steuereinrichtung 17 der Rollenrotationsdruckmaschine 1 eine Fehlermeldung gegeben werden, sobald die aktuellen Meßwerte der Meßköpfe 5 eine der Zentraleinheit 12 der Steuereinrichtung vorgegebene Toleranzgrenze überschreiten. Mit Hilfe der druckmaschinenseitigen Steuereinrichtung 17 können in einem derartigen Fall Gegenmaßnahmen eingeleitet werden, z.B. kann auf die Einstellung der Farbwerke eingewirkt werden, wie in Figur 1 durch eine Signalleitung 19 angedeutet ist. Gleichzeitig kann eine Alarmeinrichtung 20 zur Alarmierung des Druckpersonals betätigt werden. Außerdem ist es natürlich möglich die betroffenen Produkte zu kennzeichnen, indem mit geeigneter Farbe beaufschlagbare Sprühdüsen geöffnet werden, oder auszusondern, indem die Makulaturschleusen geöffnet werden.In the example shown, the central unit 12 of the control device is also linked to the control device 17 of the web-fed rotary printing press 1, as indicated by the signal line 18. This allows the Control device 17 of the web-fed rotary printing press 1 a Error messages are given as soon as the current measured values of the Measuring heads 5 one of the central unit 12 of the control device Exceed tolerance limit. With the help of the press side In such a case, control device 17 can take countermeasures be initiated, e.g. can affect the setting of the inking units are, as indicated in Figure 1 by a signal line 19. At the same time, an alarm device 20 for alarming the Printing personnel are operated. It is of course also possible to mark affected products by applying a suitable color Spray nozzles can be opened or discarded by the Waste gates are opened.

Nach Beendigung der Produktion kann eine Auswertung der im Aufzeichnungsspeicher 10 gespeicherten Informationen nach verschiedenen Kriterien erfolgen. Sinnvoll und aussagekräftig ist dabei eine Auswertung nach dem sogenannten Farbort der jeweiligen Meßstelle, wobei den drei Grundfarben zugeordnete Vektoren Verwendung finden. Ein entsprechendes Diagramm liegt der Figur 2 zugrunde. Dieses Diagramm zeigt die Entwicklung der Farbe über die Fortdruckdauer. Der Punkt 21 charakterisiert praktisch den Idealwert. Das den Punkt 21 umgebenende Feld 22 charakterisiert den Spektralbereich, innerhalb dessen die Farbe sich bewegt hat. Hierbei ist auf einen Blick erkennbar, ob ein Toleranzbereich, beispielsweise inform eines um den Punkt 21 gezogenen Kreises, eingehalten worden ist oder nicht.After the end of production, an evaluation of the im Record memory 10 stored information according to various Criteria. An evaluation is useful and meaningful after the so-called color location of the respective measuring point, the three Vectors assigned to primary colors are used. A corresponding one The diagram is based on FIG. 2. This diagram shows the Development of the color over the printing period. The point 21 characterizes practically the ideal value. The field 22 surrounding point 21 characterizes the spectral range within which the color moves Has. Here you can see at a glance whether a tolerance range, for example inform of a circle drawn around point 21, has been observed or not.

Eine weitere Möglichkeit ist, die Entwicklung der Farbdichte über der Zeit aufzuzeichnen. Ein derartiges Zeit-Dichte-Diagramm liegt der Figur 3 zugrunde. Im dargestellten Beispiel sind die Verläufe der Farbdichten der drei Grundfarben über der Produktionszeit angegeben. Die Linien 23 charakterisieren dabei den idealen Verlauf. Die Kurven 24 zeigen den tatsächlichen Verlauf.Another option is to develop color density over time record. Such a time-density diagram is shown in FIG. 3 based. In the example shown, the courses of the color densities are three basic colors specified above the production time. Lines 23 characterize the ideal course. The curves 24 show the actual course.

Die Figur 4 enthält eine Spektralverteilungskurve 25, aus der sich die spektrale Verteilung aller im zugeordneten Meßbereich auftretenden Farben über dem gesamten sichtbaren Spektrum ergibt. Dabei kann die spektrale Verteilung einzelner Messungen oder eine Integration über mehrere oder alle Messungen dargestellt werden.FIG. 4 contains a spectral distribution curve 25, from which the spectral distribution of all colors occurring in the assigned measuring range over the entire visible spectrum. The spectral Distribution of individual measurements or integration over several or all measurements are displayed.

Die Erfindung bildet somit ein wichtiges Element eines zuverlässigen Qualitätsmanagements. Insbesondere bietet die Erfindung die Möglichkeit, die produzierte Qualität auch im Nachhinein exakt nachzuweisen, wodurch unberechtigten Beanstandungen begründet entgegen getreten werden kann.The invention thus forms an important element of a reliable one Quality management. In particular, the invention offers the possibility of the quality produced can also be proven retrospectively, whereby unjustified complaints can be reasonably countered.

Claims (10)

  1. Device for carrying through quality management while printing a web (2) on a rotational roller printing machine (1) with at least one measuring head (5) which is adjustable over the with of the printed web (2) and contains a tube-shape housing with a diameter exceeding the diameter of the assigned measuring field and a spectrometer and a light source and which can be activated depending on the product by means of an encoder (9) assigned to the rotational roller printing machine and which receives the colour density and spectral distribution of the colour in the assigned measuring field and with a control device (12,13) by means of which measuring signals of each measuring head (5) can be continuously recorded and stored.
  2. Device according to claim 1, characterized in that several measuring heads (5) are provided which are adjustable over the width of the printed web (2) and which preferably are arranged on cross pieces (8) which are arranged horizontally to the direction of the web (2) and which can preferably be adjusted by means of a motor, whereby the measuring heads (5) preferably can be preset manually.
  3. Device according to one of the preceding claims, characterized in that the light source of the measuring heads (5) is a flash.
  4. Device according to one of the preceding claims, characterized in that at least one device for reference measuring (15) and/or a device for compensating temperature fluctuations (15a) is provided.
  5. Device according to one of the preceding claims, characterized in that the control device comprises a central processing unit (12) which receives the signals of the encoder (9) and contains a recording memory (10) and in that the control device further contains a sub-unit (13) assigned to the measuring heads (5) which communicates with the central unit, whereby the central processing unit (12) preferably has an operating device (11) and a display unit (16) and whereby the central processing unit (12) is connected to the control unit (17), assigned to the rotational roller printing machine (1).
  6. Device according claim 5, characterized in that depending on the signals from the central processing unit 12an alarm unit (20) can be operated and/or the setting of the colour system of the rotational roller printing machine can be changed.
  7. Device according to one of the preceding claims, characterized in that the measuring heads (5) are arranged within an area between a dryer and/or cooler (3) and a folder (4).
  8. Process for carrying through quality management while printing on a rotational roller printing machine (1) and using a device according one of the preceding claims, where a periodic, simultaneous measurement of colour density and spectral distribution in at least one selected point of the periodically returning printing pattern is carried out, where the measurement results during production are continuously measured and stored and where, at least at the end of the production, an analysis by predetermined criteria is carried through whereby preferably the measured results are analyzed in relation to the colour location and/or a time-density-diagram is drawn up.
  9. Process according claim 8, characterized in that a representation of the spectral distribution of individual measurements and/or an integration of several or all measurements is drawn up.
  10. Process according to one of the preceding claims 8 or 9, characterized in that tolerance limits are set up in relation to certain criteria and that a continuous analysis is carried through over the entire duration of the production taken into account said criteria; if the tolerance limits are exceeded the rotational roller printing machine (1) is adapted or the sluices for waste sheets opened.
EP97121396A 1997-02-19 1997-12-05 Device and method for quality control Expired - Lifetime EP0860276B1 (en)

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DE19706412 1997-02-19
DE19706412 1997-02-19

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EP (1) EP0860276B1 (en)
JP (1) JPH10230586A (en)
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DE10131934B4 (en) * 2001-07-02 2010-03-11 Wifag Maschinenfabrik Ag Measurement and control of color in web-fed printing
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DE102004021600A1 (en) * 2004-05-03 2005-12-08 Gretag-Macbeth Ag Device for inline monitoring of print quality in sheetfed offset presses
EP1965982B1 (en) * 2005-11-25 2014-06-11 KBA-NotaSys SA Method for detection of occurrence of printing errors on printed substrates during processing thereof on a printing press
DE102006055302B4 (en) 2005-12-20 2022-06-23 Heidelberger Druckmaschinen Ag Process for selecting printing materials in a printing machine
US7287473B2 (en) 2005-12-20 2007-10-30 Heidelberger Druckmaschinen Ag Method for selecting printing material in a printing press and printing press
DE102006022529B4 (en) 2006-05-15 2009-05-20 Koenig & Bauer Aktiengesellschaft Web-fed rotary press with at least one inking unit and with an in-line inspection system
DE102006048539A1 (en) * 2006-10-13 2008-04-17 Heidelberger Druckmaschinen Ag Color measuring head positioning device
DE202011050535U1 (en) * 2011-06-22 2012-09-24 Eltromat Gmbh Web inspection system for rotary printing machines

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US5927201A (en) 1999-07-27
EP0860276A1 (en) 1998-08-26
JPH10230586A (en) 1998-09-02
CN1191805A (en) 1998-09-02
CN1089687C (en) 2002-08-28
DE59708489D1 (en) 2002-11-21
HK1014905A1 (en) 1999-10-08

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