EP0149424A2 - Method and device for determining the quality of prints, and colour test strip for said determination - Google Patents

Method and device for determining the quality of prints, and colour test strip for said determination Download PDF

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Publication number
EP0149424A2
EP0149424A2 EP84810613A EP84810613A EP0149424A2 EP 0149424 A2 EP0149424 A2 EP 0149424A2 EP 84810613 A EP84810613 A EP 84810613A EP 84810613 A EP84810613 A EP 84810613A EP 0149424 A2 EP0149424 A2 EP 0149424A2
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EP
European Patent Office
Prior art keywords
measuring
information
code
color
strip
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Granted
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EP84810613A
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German (de)
French (fr)
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EP0149424B1 (en
EP0149424A3 (en
Inventor
Hans Ott
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Gretag AG
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Gretag AG
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Priority to AT84810613T priority Critical patent/ATE58336T1/en
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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2233/00—Arrangements for the operation of printing presses
    • B41P2233/50—Marks on printed material
    • B41P2233/51—Marks on printed material for colour quality control

Definitions

  • the invention relates to a method and a device as well as a color measuring strip used to assess the print quality of a printed product according to the preambles of claims 1-3.
  • One of the most common methods for evaluating print quality is to print a color measuring strip made up of a number of measuring fields of different types and colors and then evaluate it colorimetrically.
  • the densitometric measurement of the color measuring strip can be carried out off-line using a manual densitometer or preferably using an automatic scanning densitometer or on-line on the running printing press using a so-called machine densitometer.
  • Suitable scanning densitometers are described, inter alia, in ZA-PS 82/2290 ( Z EP-A-64024 or US patent application Ser. No.
  • an information code is thus added or assigned to the individual measuring fields of the color measuring strip.
  • This code is read during the measurement and then provides all the necessary information.
  • this includes position information with regard to the optimal measuring location, quality information with regard to the type and color of the measuring field, adjustment information with regard to the relative position of the reading track with respect to the measuring field and test information for detecting reading errors.
  • the longitudinal direction of the color measuring strip is labeled X, the direction transverse to it is labeled Y.
  • the color measuring strip FMS consists of a larger number of usually different color measuring fields MF, which are arranged with gaps Z or immediately after one another.
  • Each measuring field MF is assigned an information code IC, which is arranged on the side next to the respective measuring field.
  • the information code IC is designed as a bar code, with its reading direction running in the X direction, ie coinciding with the direction of movement of the scanning head for the measuring fields MF.
  • Each information code IC comprises a number of fixed and variable code elements in the form of bars or bars, the information being in the bar width and the spacing.
  • the two foremost, fixed code elements 1 and 2 in the reading direction are start or margin characters and contain the position to the center of the measuring field M in the X direction.
  • the two subsequent, likewise fixed code elements 4 and 5 contain position information relative to the measuring field center M in the Y direction, that is to say transversely to the scanning direction. They are designed in such a way that depending on the position of a code reading head to be written and the scanning head with the measuring head for the measuring fields, which is in a fixed spatial assignment, relative to the center of the measuring field, i.e. when reading along different distances from the center of the measuring field M, different information results and from this the relative position of the scanning head in the Y direction can be concluded. For example, three such reading tracks are indicated in the drawing by dash-dotted lines 11-13.
  • the remaining code elements 6-9 are variable and form quality information which indicates the color and / or the type (full tone, grid field, etc.) of the respective measuring field MF.
  • the information code IC can also contain information for the detection of reading errors and / or regarding the distance of the next measuring field, etc. Further information includes information about the machine center and zones of the press.
  • the color measuring strip FMS of FIG. 2 is intended for on-line measurement using a machine densitometer on the running printing press.
  • the information codes IC are not arranged to the side of each measuring field, but in the longitudinal direction of the strip in front of or behind the respective measuring field MF.
  • the reading direction results from the relative movement between the fixed reading head and the sheet drum of the printing press (or possibly also a separate measuring device), so it is transverse to the longitudinal direction of the strip X.
  • the structure of the information code IC is in principle the same as that of FIG. 1 in the example shown however, some codes include a fixed code element 3 and a variable code element 10.
  • the fixed code elements 1-3 define the position information in the Y direction
  • the fixed code elements 4 and 5 give information about the track position or position in the X direction
  • the variable code elements 6-10 contain the remaining information parts.
  • the dash-dotted lines 11-13 indicate three different reading tracks.
  • the basic arrangement of the essential parts of the invention of a scanning densitometer designed according to the invention is shown in plan and elevation.
  • the scanning densitometer is constructed in the same way as that according to the ZA-PS 82/2290 mentioned at the beginning, but differs essentially only in an additional reading head for the information code and a corresponding interface to the ver Binding of the reading head with the electronic system implemented by a computer to control the movement and measurement functions and to process the read data.
  • a carriage 20 is arranged on the bridge, not shown, along the color measuring strip FMS.
  • the carriage 20 contains a scanning head 21 for the measuring fields MF and, in a fixed spatial assignment, a reading head 22 for the information codes IC.
  • the scanning head 21 contains a light source 211 and light receiver 212 and generates a circular measuring spot 213 on the printed sheet B.
  • the reading head 22 comprises several, here e.g.
  • the scanning head 21 and the reading head 22 are each connected to the electronic system 25 via a corresponding interface 23 or 24.
  • the latter controls all movements of the carriage, all measuring functions of the scanning and reading heads and also processes the scanning and reading data. Details are described in the aforementioned ZA-PS 82/2290 and therefore do not require any explanation here.
  • the carriage 20 moves along the color measuring strip.
  • the scanning head 21 scans the individual measuring fields MF.
  • the reading head 22 is offset from the scanning head 21 and reads the information codes of the subsequent measuring fields in advance.
  • the multiple reading of the information codes in a plurality of parallel tracks makes it possible to keep the information codes IC relatively narrow ("1 mm), since the code can always be read without errors in at least one of the scanning tracks
  • the electronic system analyzes the information from the individual reading tracks and uses this to determine the track position and the exact position in the Y direction.
  • FIGS. 5 and 6 The arrangement shown schematically in FIGS. 5 and 6 for a machine densitometer is constructed analogously to FIGS. 3 and 4.
  • the printed sheet B is located on a drum T belonging to the printing press, which rotates in the direction of the arrow Y and thereby moves the sheet B relative to a carriage 40.
  • This carriage 40 contains a scanning head 41 for the measuring fields MF and a reading head 42 for the information codes IC of the color measuring strip FMS on the sheet B.
  • the scanning head 41 consists essentially of a light source 411 and light receivers 412 and generates a measuring spot 413 on the sheet
  • Read head 42 again comprises five light sources 421 and five light sources 422 and accordingly generates five scanning light spots 423 on the sheet.
  • the scanning and reading head are connected via interfaces 43 and 44 to an electronic system 45 for controlling the movement and functional sequences and for processing the measurement and scanning data.
  • the carriage 40 is slidably arranged parallel to the drum axis (X direction).
  • the reading head 42 reads the information code IC belonging to a measuring field MF in advance of the scanning of the relevant measuring field by the scanning head 41. This time offset is determined by the space-related spatial offset of the scanning and reading head and by the peripheral speed of the drum T.
  • the evaluation of the information read by the reading head 42 enables the precise lateral positioning (X direction) and, if necessary, an optimal correction when moving in the X direction to the next measuring field to be scanned.
  • the information code is an integral part of the color measuring strip, ie it is printed in the same way as the color measuring fields.
  • the information code in the form of a template or a Type of code ruler. This template is then attached to the measuring table in a defined assignment when measuring the color measuring strip and is used in exactly the same way as the information code printed on it.
  • An individual code template would of course have to be provided for each type of color measuring strip.

Abstract

A color measuring strip having a plurality of different measuring fields includes information codes located either laterally adjacent to, or between, individual measuring fields. The information codes are individually assigned to respective measuring fields, and contain information relating to such items as scanning position and the color and type of the field concerned. The information codes are machine-read and are evaluated so that a scanning head may be positioned relative to the measuring fields, and are further used in processing the data provided by the scanning head.

Description

Die Erfindung betrifft ein Verfahren und eine Vorrichtung sowie einen dabei verwendeten Farbmessstreifen zur Beurteilung der Druckqualität eines Druckerzeugnisses gemäss den Oberbegriffen der Patentansprüche 1-3.The invention relates to a method and a device as well as a color measuring strip used to assess the print quality of a printed product according to the preambles of claims 1-3.

Eine der gängigsten Methoden zur Druckqualitätsbeurteilung besteht darin, einen aus einer Reihe von Messfeldern unterschiedlicher Art und Farbe aufgebauten Farbmessstreifen mitzudrucken und diesen dann farbmetrisch auszuwerten. Das densitometrische Ausmessen des Farbmessstreifens kann off-line mittels Handdensitometer oder vorzugsweise mittels automatischer Abtastdensitometer oder on-line an der laufenden Druckmaschine mittels sog. Maschinendensitometer erfolgen. Dazu geeignete Abtastdensitometer sind u.a. in ZA-PS 82/2290 (Z EP-A-64024 bzw. US-Patentanmeldung Ser. No. 363 538), US-PS 3 995 958 und US-PS 4 289 405 (e EP-A-11376) beschrieben, Beispiele für Maschinendensitometer finden sich u.a. in US-PS 3 376 426 und US-PS 3 390 447.One of the most common methods for evaluating print quality is to print a color measuring strip made up of a number of measuring fields of different types and colors and then evaluate it colorimetrically. The densitometric measurement of the color measuring strip can be carried out off-line using a manual densitometer or preferably using an automatic scanning densitometer or on-line on the running printing press using a so-called machine densitometer. Suitable scanning densitometers are described, inter alia, in ZA-PS 82/2290 ( Z EP-A-64024 or US patent application Ser. No. 363 538), US-PS 3 995 958 and US-PS 4 289 405 ( e EP-A -11376), examples of machine densitometers can be found, inter alia, in US Pat. No. 3,376,426 and US Pat. No. 3,390,447.

Bei der maschinellen Ausmessung der Farbmessstreifen besteht eines der heikelsten Probleme in der präzisen Auffindung der geeigneten Messpositionen sowie in der Erkennung von Farbe und Art der einzelnen Messfelder. Dieses Problem wird nun gemäss der Erfindung durch die in den Patentansprüchen 1-3 angeführten Massnahmen und Mittel gelöst.When measuring the color measuring strips by machine, one of the trickiest problems is the precise finding of the suitable measuring positions and the recognition of the color and type of the individual measuring fields. This problem is now according to the invention by the in the claims 1 - 3 dissolved mentioned measures and agents.

Gemäss der grundlegenden Idee der Erfindung wird also den einzelnen Messfeldern des Farbmessstreifens ein Informationscode beigefügt bzw. zugeordnet. Dieser Code wird bei der Ausmessung mit abgelesen und liefert dann alle notwendigen Informationen. Dazu gehören vor allem eine Positionsinformation bezüglich des optimalen Messorts, eine Qualitätsinformation bezüglich Art und Farbe des Messfelds, eine Justierinformation bezüglich der relativen Lage der Lesespur zum Messfeld und eine Prüfinformation zum Erkennen von Lesefehlern.According to the basic idea of the invention, an information code is thus added or assigned to the individual measuring fields of the color measuring strip. This code is read during the measurement and then provides all the necessary information. Above all, this includes position information with regard to the optimal measuring location, quality information with regard to the type and color of the measuring field, adjustment information with regard to the relative position of the reading track with respect to the measuring field and test information for detecting reading errors.

Bei dem in US-PS 4 289 405 beschriebenen Abtastdensitometersystem ist vorgesehen, die Messpositionen der abzutastenden Messfelder durch einen manuell angebrachten Markierungsstrich festzulegen. Abgesehen davon, dass dieses System nicht auf Maschinendensitometer übertragbar ist, müssen bei diesem System andere als Positionsinformationen auf andere, kompliziertere Weise aus dem Farbmessstreifen selbst gewonnen werden, was in der Praxis mit grossen Schwierigkeiten und erheblichem Aufwand verbunden ist.In the scanning densitometer system described in US Pat. No. 4,289,405, provision is made to determine the measuring positions of the measuring fields to be scanned by means of a manually applied marking line. In addition to the fact that this system cannot be transferred to machine densitometers, in this system other than position information must be obtained from the color measuring strip itself in a different and more complicated manner, which is associated with great difficulties and considerable effort in practice.

Im folgenden wird die Erfindung anhand der Zeichnung näher erläutert. Es zeigen:

  • Fig. 1 und 2 je einen Ausschnitt aus zwei verschiedenen Ausführungsbeispielen eines erfindungsgemässen Farbmessstreifens,
  • Fig. 3 und 4 zwei schematische Prinzipdarstellungen der erfindungsrelevanten Teile einer Abtastdensitometerversion der erfindungsgemässen Vorrichtung und
  • Fig. 5 und 6 zwei analoge Darstellungen einer Maschinendensitometerversion.
The invention is explained in more detail below with reference to the drawing. Show it:
  • 1 and 2 each a section of two different exemplary embodiments of a color measuring strip according to the invention,
  • 3 and 4 show two schematic basic representations of the parts of a scanning densitometer version of the device according to the invention relevant to the invention and
  • 5 and 6 two analog representations of a machine densitometer version.

Der Farbmesstreifen gemäss Fig. 1 ist für die Off-line-Auswertung mittels eines automatischen Abtastdensitometers bestimmt. Die Längsrichtung des Farbmessstreifens ist mit X bezeichnet, die Richtung quer dazu trägt die Bezeichnung Y.1 is intended for off-line evaluation using an automatic scanning densitometer. The longitudinal direction of the color measuring strip is labeled X, the direction transverse to it is labeled Y.

Der Farbmessstreifen FMS besteht aus einer grösseren Anzahl von in der Regel unterschiedlichen Farbmessfeldern MF, die mit Zwischenräumen Z oder unmittelbar anschliessend aneinandergereiht sind. Jedem Messfeld MF ist ein Informationscode IC zugeordnet, welcher seitlich neben dem jeweiligen Messfeld angeordnet ist. Der Informationscode IC ist als Strichcode ausgebildet, wobei seine Leserichtung in X-Richtung verläuft, also mit der Bewegungsrichtung des Abtastkopfs für die Messfelder MF zusammenfällt.The color measuring strip FMS consists of a larger number of usually different color measuring fields MF, which are arranged with gaps Z or immediately after one another. Each measuring field MF is assigned an information code IC, which is arranged on the side next to the respective measuring field. The information code IC is designed as a bar code, with its reading direction running in the X direction, ie coinciding with the direction of movement of the scanning head for the measuring fields MF.

Jeder Informationscode IC umfasst eine Anzahl von fixen und variablen Codelementen in Form von Strichen oder Balken, wobei die Information in der Strichbreite und den Abständen liegt.Each information code IC comprises a number of fixed and variable code elements in the form of bars or bars, the information being in the bar width and the spacing.

Die beiden in Leserichtung vordersten, fixen Codeelemente 1 und 2 sind Start- oder Randzeichen und beinhalten die Position zum Messfeldmittelpunkt M in X-Richtung.The two foremost, fixed code elements 1 and 2 in the reading direction are start or margin characters and contain the position to the center of the measuring field M in the X direction.

Die beiden darauf folgenden, ebenfalls fixen Codeelemente 4 und 5 beinhalten eine Positionsinformation relativ zum Messfeldmittelpunkt M in Y-Richtung, also quer zur Abtastrichtung. Sie sind so ausgebildet, dass sich je nach Position eines noch zu beschreibenden Code-Lesekopfs und des mit diesem in fixer räumlicher Zuordnung befindlichen Abtastkopfs für die Meesfelder relativ zum Messfeldmittelpunkt, also bei Ablesung längs unterschiedlich weit vom Messfeldmittelpunkt M entfernten Lesespuren unterschiedliche Informationen ergeben und daraus auf die relative Lage des Abtastkopfs in Y-Richtung geschlossen werden kann. Drei solcher Lesespuren sind in der Zeichnung baispielsweise durch strichpunktierte Linien 11-13 - angedeutet.The two subsequent, likewise fixed code elements 4 and 5 contain position information relative to the measuring field center M in the Y direction, that is to say transversely to the scanning direction. They are designed in such a way that depending on the position of a code reading head to be written and the scanning head with the measuring head for the measuring fields, which is in a fixed spatial assignment, relative to the center of the measuring field, i.e. when reading along different distances from the center of the measuring field M, different information results and from this the relative position of the scanning head in the Y direction can be concluded. For example, three such reading tracks are indicated in the drawing by dash-dotted lines 11-13.

Die übrigen Codeelemente 6-9 sind variabel und bilden eine Qualitätsinformation, welche die Farbe und/oder die Art (Vollton, Rasterfeld etc.) des jeweiligen Messfelds MF angibt.The remaining code elements 6-9 are variable and form quality information which indicates the color and / or the type (full tone, grid field, etc.) of the respective measuring field MF.

Zusätzlich zu den genannten Informationsarten kann der Informationscode IC noch Informationen zur Erkennung von Lesefehlern und/oder betreffend den Abstand des nächstfolgenden Messfelds usw. enthalten. Weitere Informationen sind Angaben über die Maschinenmitte und Zonen der Druckmaschine.In addition to the types of information mentioned, the information code IC can also contain information for the detection of reading errors and / or regarding the distance of the next measuring field, etc. Further information includes information about the machine center and zones of the press.

Der Farbmessstreifen FMS der Fig. 2 ist für die On-line-Messung mittels Maschinendensitometer an der laufenden Druckmaschine bestimmt. Bei diesem Farbmessstreifen FMS sind die Informationscodes IC nicht seitlich neben jedem Messfeld, sondern in Streifenlängsrichtung vor oder hinter dem jeweils betreffenden Messfeld MF angeordnet. Die Leserichtung ergibt sich aus der Relativbewegung zwischen feststehendem Lesekopf und Bogentrommel der Druckmaschine (oder eventuell auch einer separaten Messvorrichtung), ist also quer zur Streifenlängsrichtung X. Der Aufbau des Informationscodes IC ist im Prinzip gleich wie der der Fig. l, im gezeigten Beispiel besitzen jedoch einige Codes ein fixes Codeelement 3 und ein variables Codeelement 10 mehr. Die fixen Codeelemente 1-3 definieren die Positionsinformation in Y-Richtung, die fixen Codeelemente 4 und 5 geben eine Information über die Spurlage bzw. Position in X-Richtung und die variablen Codeelemente 6-10 beinhalten die übrigen Informationsteile. Die strichpunktierten Linien 11-13 deuten drei verschiedene Lesespuren an.The color measuring strip FMS of FIG. 2 is intended for on-line measurement using a machine densitometer on the running printing press. With this color measuring strip FMS, the information codes IC are not arranged to the side of each measuring field, but in the longitudinal direction of the strip in front of or behind the respective measuring field MF. The reading direction results from the relative movement between the fixed reading head and the sheet drum of the printing press (or possibly also a separate measuring device), so it is transverse to the longitudinal direction of the strip X. The structure of the information code IC is in principle the same as that of FIG. 1 in the example shown however, some codes include a fixed code element 3 and a variable code element 10. The fixed code elements 1-3 define the position information in the Y direction, the fixed code elements 4 and 5 give information about the track position or position in the X direction and the variable code elements 6-10 contain the remaining information parts. The dash-dotted lines 11-13 indicate three different reading tracks.

In den Fig. 3 und 4 ist in Grund- und Aufriss die prinzipielle Anordnung der für die Erfindung wesentlichen Teile eines erfindungsgemäss ausgebildeten Abtastdensitometers dargestellt. Das Abtastdensitometer ist im Prinzip gleich aufgebaut wie das gemäss der eingangs angeführten ZA-PS 82/2290, es unterscheidet sich demgegenüber im wesentlichen nur durch einen zusätzlichen Lesekopf für den Informationscode sowie eine entsprechende Schnittstelle zur Verbindung des Lesekopfs mit dem durch einen Computer realisierten elektronischen System zur Steuerung der Bewegungs- und Messfunktionen sowie zur Verarbeitung der abgelesenen Daten.3 and 4, the basic arrangement of the essential parts of the invention of a scanning densitometer designed according to the invention is shown in plan and elevation. In principle, the scanning densitometer is constructed in the same way as that according to the ZA-PS 82/2290 mentioned at the beginning, but differs essentially only in an additional reading head for the information code and a corresponding interface to the ver Binding of the reading head with the electronic system implemented by a computer to control the movement and measurement functions and to process the read data.

Ueber einem Druckbogen B, auf den der Farbmessstreifen FMS mit seinen Messfeldern MF und den zugeordneten Informationscodes IC gemäss Fig. 1 gedruckt ist, ist auf einer nicht gezeigten Brücke ein Schlitten 20 dem Farbmessstreifen FMS entlang führbar angeordnet. Der Schlitten 20 enthält einen Abtastkopf 21 für die Messfelder MF sowie in fixer räumlicher Zuordnung dazu einen Lesekopf 22 für die Informationscodes IC. Der Abtastkopf 21 enthält eine Lichtquelle 211 und Lichtempfänger 212 und erzeugt auf dem Druckbogen B einen kreisförmigen Messfleck 213. Der Lesekopf 22 umfasst mehrere, hier z.B. fünf Lichtquellen 221 und entsprechend viele Lichtempfänger 222 und erzeugt auf dem Druckbogen fünf quer zur Längsrichtung des Farbmessstreifens, also in Y-Richtung nebeneinander liegende Abtastlichtflecke 223, welche den Informationscode IC in fünf verschiedenen Spuren abtasten.Above a printed sheet B, on which the color measuring strip FMS with its measuring fields MF and the associated information codes IC according to FIG. 1 is printed, a carriage 20 is arranged on the bridge, not shown, along the color measuring strip FMS. The carriage 20 contains a scanning head 21 for the measuring fields MF and, in a fixed spatial assignment, a reading head 22 for the information codes IC. The scanning head 21 contains a light source 211 and light receiver 212 and generates a circular measuring spot 213 on the printed sheet B. The reading head 22 comprises several, here e.g. five light sources 221 and a corresponding number of light receivers 222 and produces five scanning light spots 223 lying on the printing sheet transversely to the longitudinal direction of the color measuring strip, that is to say in the Y direction, which scan the information code IC in five different tracks.

Der Abtastkopf 21 und der Lesekopf 22 sind je über eine entsprechende Schnittstelle 23 bzw. 24 mit dem elektronischen System 25 verbunden. Letzteres kontrolliert alle Bewegungsabläufe des Schlittens, alle Messfunktionen von Abtast- und Lesekopf und verarbeitet auch die Abtast- und Lesedaten. Einzelheiten sind in der genannten ZA-PS 82/2290 beschrieben und bedürfen daher hier keiner Erläuterung.The scanning head 21 and the reading head 22 are each connected to the electronic system 25 via a corresponding interface 23 or 24. The latter controls all movements of the carriage, all measuring functions of the scanning and reading heads and also processes the scanning and reading data. Details are described in the aforementioned ZA-PS 82/2290 and therefore do not require any explanation here.

Der Schlitten 20 bewegt sich längs des Farbmessstreifens. Der Abtastkopf 21 tastet dabei die einzelnen Messfelder MF ab. Der Lesekopf 22 ist aus Platzgründen versetzt zum Abtastkopf 21 angeordnet und liest die Informationscodes der nachfolgenden Messfelder zeitlich voreilend. Die Mehrfachablesung der Informationscodes in mehreren parallelen Spuren erlaubt es, die Informationscodes IC relativ schmal (" 1 mm) zu halten, da in wenigstens einer der Abtastspuren der Code immer fehlerfrei zu lesen sein wird. Im elektronischen System werden die Informationen aus den einzelnen Ablesespuren analysiert und daraus die Spurlage und die exakte Position in Y-Richtung ermittelt.The carriage 20 moves along the color measuring strip. The scanning head 21 scans the individual measuring fields MF. For reasons of space, the reading head 22 is offset from the scanning head 21 and reads the information codes of the subsequent measuring fields in advance. The multiple reading of the information codes in a plurality of parallel tracks makes it possible to keep the information codes IC relatively narrow ("1 mm), since the code can always be read without errors in at least one of the scanning tracks The electronic system analyzes the information from the individual reading tracks and uses this to determine the track position and the exact position in the Y direction.

Die in den Fig. 5 und 6 schematisch dargestellte Anordnung für ein Maschinendensitometer ist analog den Fig. 3 und 4 aufgebaut. Hier befindet sich der Druckbogen B auf einer zur Druckmaschine gehörenden Trommel T, die sich in Richtung des Pfeils Y dreht und dadurch den Bogeh B relativ zu einem Schlitten 40 bewegt. Dieser Schlitten 40 enthält einen Abtastkopf 41 für die Messfelder MF sowie einen Lesekopf 42 für die Informationscodes IC des Farbmessstreifens FMS auf dem Bogen B. Der Abtastkopf 41 besteht im wesentlichen aus einer Lichtquelle 411 und Lichtempfängern 412 und erzeugt auf dem Bogen einen Messfleck 413. Der Lesekopf 42 umfasst wieder fünf Lichtquellen 421 und fünf Lichtquellen 422 und erzeugt entsprechend fünf Abtastlichtflecke 423 auf dem Bogen. Abtast- und Lesekopf sind über Schnittstellen 43 und 44 mit einem elektronischen System 45 zur Steuerung der Bewegungs-und Funktionsabläufe sowie zur Verarbeitung der Mess- und Abtastdaten verbunden.The arrangement shown schematically in FIGS. 5 and 6 for a machine densitometer is constructed analogously to FIGS. 3 and 4. Here the printed sheet B is located on a drum T belonging to the printing press, which rotates in the direction of the arrow Y and thereby moves the sheet B relative to a carriage 40. This carriage 40 contains a scanning head 41 for the measuring fields MF and a reading head 42 for the information codes IC of the color measuring strip FMS on the sheet B. The scanning head 41 consists essentially of a light source 411 and light receivers 412 and generates a measuring spot 413 on the sheet Read head 42 again comprises five light sources 421 and five light sources 422 and accordingly generates five scanning light spots 423 on the sheet. The scanning and reading head are connected via interfaces 43 and 44 to an electronic system 45 for controlling the movement and functional sequences and for processing the measurement and scanning data.

Der Schlitten 40 ist parallel zur Trommelachse (X-Richtung) verschiebbar angeordnet. Der Lesekopf 42 liest den zu einem Messfeld MF gehörenden Informationscode IC zeitlich voreilend gegenüber der Abtastung des betreffenden Messfelds durch den Abtastkopf 41. Dieser zeitliche Versatz ist durch den platzbedingten räumlichen Versatz von Abtast- und Lesekopf sowie durch die Umfangsgeschwindigkeit der Trommel T festgelegt. Die Auswertung der vom Lesekopf 42 abgelesenen Informationen ermöglicht die genaue seitliche Positionierung (X-Richtung) und gegebenenfalls eine optimale Korrektur bei der Verschiebung in X-Richtung zum nächsten abzutastenden Messfeld.The carriage 40 is slidably arranged parallel to the drum axis (X direction). The reading head 42 reads the information code IC belonging to a measuring field MF in advance of the scanning of the relevant measuring field by the scanning head 41. This time offset is determined by the space-related spatial offset of the scanning and reading head and by the peripheral speed of the drum T. The evaluation of the information read by the reading head 42 enables the precise lateral positioning (X direction) and, if necessary, an optimal correction when moving in the X direction to the next measuring field to be scanned.

Bei den vorstehend beschriebenen Ausführungsvarianten ist der Informationscode integraler Bestandteil des Farbmessstreifens, d.h., er wird genau so wie die Farbmessfelder jeweils mitgedruckt. Es ist jedoch auch ohne weiteres möglich, nur die Farbmessfelder allein zu drucken und den Informationscode in Form einer Schablone bzw. einer Art Codelineal auszubilden. Diese Schablone wird dann beim Ausmessen des Farbmessstreifens in definierter Zuordnung zu diesem auf dem Messtisch befestigt und im übrigen genau gleich verwendet wie der mitgedruckte Informationscode. Für jede Art von Farbmessstreifen müsste natürlich eine individuelle Codeschablone vorgesehen sein.In the embodiment variants described above, the information code is an integral part of the color measuring strip, ie it is printed in the same way as the color measuring fields. However, it is also readily possible to print only the color measurement fields alone and the information code in the form of a template or a Type of code ruler. This template is then attached to the measuring table in a defined assignment when measuring the color measuring strip and is used in exactly the same way as the information code printed on it. An individual code template would of course have to be provided for each type of color measuring strip.

Claims (13)

1. Verfahren zur Beurteilung der Druckqualität eines Druckerzeugnisses anhand eines mitgedruckten, aus einzelnen Messfeldern bestehenden Farbmessstreifens, der mittels eines Densitometers maschinell gemessen und farbmetrisch analysiert wird, dadurch gekennzeichnet, dass den Messfeldern des Farbmessstreifens je ein maschinell lesbarer Informationscode zugeordnet und in räumlicher Zuordnung mit dem jeweils betreffenden Messfeld mitgedruckt wird, und dass diese Informationscodes maschinell abgelesen und bei der Ausmessung und farbmetrischen Analyse des Farbmessstreifens mitberücksichtigt werden.1.Procedure for assessing the print quality of a printed product on the basis of a printed color measuring strip consisting of individual measuring fields, which is measured mechanically and analyzed colorimetrically using a densitometer, characterized in that the measuring fields of the color measuring strip are each assigned a machine-readable information code and in spatial association with the relevant measurement field is also printed, and that these information codes are read by machine and taken into account in the measurement and colorimetric analysis of the color measurement strip. 2. Vorrichtung zur Durchführung des Verfahrens nach Anspruch I, mit einem längs einer Spur beweglichen Abtastkopf für die fotoelektrische Ausmessung der einzelnen Messfelder des Farbmessstreifens und mit einem mit dem Abtastkopf verbundenen elektronischen System zur Steuerung der Bewegungs- und Messfunktionen des Abtastkopfs sowie zur Auswertung der von diesem erfassten Messdaten, gekennzeichnet durch einen Lesekopf zur Ablesung der den Messfeldern zugeordneten Informationscodes sowie durch eine das elektronische System mit dem Lesekopf verbindende Codeleseschnittstelle, welche die abgelesene Information an das elektronische System weitergibt.2. Device for carrying out the method according to claim I, with a scanning head movable along a track for the photoelectric measurement of the individual measuring fields of the color measuring strip and with an electronic system connected to the scanning head for controlling the movement and measurement functions of the scanning head and for evaluating the this measured data, characterized by a reading head for reading the information codes assigned to the measuring fields and by a code reading interface connecting the electronic system to the reading head, which forwards the read information to the electronic system. 3. Eine Mehrzahl von unterschiedlichen Messfeldern umfassender Farbmessstreifen für die Beurteilung der Druckqualität eines Druckerzeugnisses, dadurch gekennzeichnet, dass den einzelnen Messfeldern (MF) jeweils ein maschinell lesbarer Informationscode (IC) zugeordnet ist.3. A plurality of different measuring fields comprising color measuring strips for assessing the print quality of a printed product, characterized in that the individual measuring fields (MF) are each assigned a machine-readable information code (IC). 4. Farbmessstreifen nach Anspruch 3, dadurch gekennzeichnet, dass der Informationscode (IC) eine Positionsinformation über den optimalen Messort im zugeordneten Messfeld (MF) enthält.4. Color measuring strip according to claim 3, characterized in that the information code (IC) contains position information about the optimal measuring location in the assigned measuring field (MF). 5. Farbmessstreifen nach Anspruch 3 oder 4, dadurch gekennzeichnet, dass der Informationscode (IC) eine Qualitätsinformation über die Art des zugeordneten Messfelds (MF) enthält.5. Color measuring strip according to claim 3 or 4, characterized in that the information code (IC) contains quality information about the type of the assigned measuring field (MF). 6. Farbmessstreifen nach Anspruch 4 oder 5, dadurch gekennzeichnet, dass der Informationscode (IC) eine Justierinformation über die Lage der momentanen Lesespur relativ zum Messfeld (MF) enthält.6. Color measuring strip according to claim 4 or 5, characterized in that the information code (IC) contains adjustment information about the position of the current reading track relative to the measuring field (MF). 7. Farbmessstreifen nach einem der Ansprüche 3-6, dadurch gekennzeichnet, dass der Informationscode (IC) in Streifenlängsrichtung gesehen seitlich neben dem jeweils zugeordneten Messfeld (MF) angeordnet ist.7. color measuring strip according to one of claims 3-6, characterized in that the information code (IC) seen in the longitudinal direction of the strip is arranged laterally next to the respectively assigned measuring field (MF). 8. Farbmessstreifen nach einem der Ansprüche 3-6, dadurch gekennzeichnet, dass der Inforamtionscode (IC) in Streifenlängsrichtung gesehen vor oder nach den Messfeldern (MF) angeordnet ist.8. Color measuring strip according to one of claims 3-6, characterized in that the information code (IC) seen in the longitudinal direction of the strip is arranged before or after the measuring fields (MF). 9. Farbmessstreifen nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass der Informationscode als Strichcode ausgebildet ist.9. Color measuring strip according to claim 7 or 8, characterized in that the information code is designed as a bar code. 10. Farbmessstreifen nach einem der Ansprüche 3-9, dadurch gekennzeichnet, dass der Informationscode eine Prüfinformation zur Erkennung von Lesefehlern enthält.10. Color measuring strip according to one of claims 3-9, characterized in that the information code contains test information for the detection of reading errors. 11. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Lesekopf (22) mehrere, quer zur Leserichtung versetzte Leser (221, 222) aufweist, die den Informationscode in mehreren parallelen Spuren lesen.11. The device according to claim 2, characterized in that the reading head (22) has a plurality of readers (221, 222) which are offset transversely to the reading direction and read the information code in a plurality of parallel tracks. 12. Farbmessstreifen nach einem der Ansprüche 3 bis 10, dadurch gekennzeichnet, dass er aus zwei separaten Teilen besteht, von denen der eine die Messfelder und der andere die jeweils zugeordneten Informationscodes aufweist, wobei dieser letztgenannte Teil als Codeschablone bzw. Codelineal ausgebildet ist.12. Color measuring strip according to one of claims 3 to 10, characterized in that it consists of two separate parts, one of which has the measuring fields and the other has the respectively assigned information codes, this latter part being designed as a code template or code ruler. 13. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass anstelle die Informationscodes mitzudrucken diese in Form eines Codelineals ausgebildet werden, und dass dieses Codelineal beim Ausmessen des Farbmessstreifens neben diesem in definierter räumlicher Zuordnung befestigt und abgelesen wird.13. The method according to claim 1, characterized in that instead of also printing the information codes, these are formed in the form of a code ruler, and that this code ruler is attached and read in a defined spatial assignment when measuring the color measuring strip.
EP84810613A 1983-12-19 1984-12-13 Method and device for determining the quality of prints, and colour test strip for said determination Expired - Lifetime EP0149424B1 (en)

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AT84810613T ATE58336T1 (en) 1983-12-19 1984-12-13 METHOD, DEVICE AND COLOR STRIPS FOR ASSESSING PRINT QUALITY.

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NO845092L (en) 1985-06-20
ZA849839B (en) 1985-08-28
CA1217275A (en) 1987-01-27
ES538705A0 (en) 1986-06-16
DK162662C (en) 1992-04-06
ATE58336T1 (en) 1990-11-15
AU3689884A (en) 1985-07-04
DK162662B (en) 1991-11-25
NO168272C (en) 1992-01-29
US4671661A (en) 1987-06-09
NO168272B (en) 1991-10-21
JPS60190822A (en) 1985-09-28
AU569356B2 (en) 1988-01-28
EP0149424B1 (en) 1990-11-14
AU8182887A (en) 1988-03-24
AU605208B2 (en) 1991-01-10
DE3483606D1 (en) 1990-12-20
JPH0513245B2 (en) 1993-02-22
EP0149424A3 (en) 1988-09-21
DK605984D0 (en) 1984-12-18
ES8608157A1 (en) 1986-06-16
DK605984A (en) 1985-06-20

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