EP1084843A1 - Device for densitometric measurement of printed products - Google Patents
Device for densitometric measurement of printed products Download PDFInfo
- Publication number
- EP1084843A1 EP1084843A1 EP00117892A EP00117892A EP1084843A1 EP 1084843 A1 EP1084843 A1 EP 1084843A1 EP 00117892 A EP00117892 A EP 00117892A EP 00117892 A EP00117892 A EP 00117892A EP 1084843 A1 EP1084843 A1 EP 1084843A1
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- European Patent Office
- Prior art keywords
- measuring
- color
- fields
- color density
- zone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000326 densiometry Methods 0.000 title claims description 3
- 239000003086 colorant Substances 0.000 claims abstract description 19
- 238000011156 evaluation Methods 0.000 claims abstract description 13
- 238000007645 offset printing Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 17
- 239000000976 ink Substances 0.000 description 18
- 238000007639 printing Methods 0.000 description 11
- 238000011161 development Methods 0.000 description 3
- 230000018109 developmental process Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 241000533901 Narcissus papyraceus Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013479 data entry Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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 device for densitometric Measuring printed products according to the preamble of claim 1.
- measuring fields for the individual colors are also printed.
- the measuring strips produced Start of print or end of print assigned.
- One of the display removed sheet can then be placed on a base and in addition to the visual quality inspection by a traversing Densitometer can be measured. While traversing the densitometer has a lot of measurement data, i.e. provide the measuring fields assigned to the individual colors one or more color density values each.
- the structure also corresponds to the zonal color dosage of such a color measuring strip the ink metering zones Printing press adapted. This is the case with known color density measuring strips One measuring field per color is assigned to each color metering zone.
- Measuring fields of the basic colors cyan, magenta, yellow, black
- the measuring fields for these special colors are preferably provided in each ink metering zone, i.e. at four basic and two special colors are in each color metering zone a total of 6 differently colored measuring fields plus any additional ones Quality inspection fields arranged.
- the arrangement of the measuring fields assigned to the individual colors is in the metering zones with the known color measuring strips differently. This means that for example assigned to the color cyan in the first color metering zone Measuring field is arranged at the third measuring field position, in another place in the second ink metering zone (e.g. 5) occupies.
- the arrangement of the assigned to the individual colors Measuring field positions thus varies within the Color metering zones, so that the maximum format width looks at every color or measuring field at the edges, is more in the middle of a paint metering zone.
- a color measuring strip for sheet or printed products smaller formats (format width) used, so the measuring strip begins - centering of the measuring strip to Machine center - not with the first ink metering zone but instead with a measuring field of a certain color in one of each used printing format corresponding dosing zone.
- Another way to take into account different formats result in different assignment of measuring fields in the individual dosing zones is one manual entry, where or in which zone the first one, for example Cyan-colored, measuring field lies.
- the operator has for this purpose before measuring a first sheet of the measuring system to enter via controls that for the given format in Direction of measurement of the densitometer the cyan measuring field in the first zone of the arch is in position 3 or that in Direction of measurement of the densitometer the first measuring field of the zone far left, for example, has the color magenta.
- Information is then taking into account the known Measuring strip dismantling (assignment / arrangement of the individual different colored measuring fields in the dosing zones) can be determined, in which dosing zone the measuring strip begins.
- Color measuring strips arranged according to the substrate format has the disadvantage that by incorrect input incorrect measurement values obtained or the measurement values obtained not assigned to the corresponding ink metering zones can be. Deriving control commands for the zonal Color guidance is then not possible. Also possibly necessary Detection runs are considered due to the additional time involved to look at disadvantageously.
- the object of the present invention is therefore a device for densitometric measurement of printed products to expand in accordance with the preamble of claim 1, so that a simple and fail-safe assignment of the in the Measuring field colors arranged in individual color metering zones possible is.
- the densitometer downstream and comprising a computing device Evaluation unit a comparison of the color density values of a Measuring field with the neighboring measuring fields of the same Color and measuring field type (full tone or screen tone) becomes. It is taken into account that within a measuring strip known structure, the arrangement of, for example measuring fields assigned to the printing ink cyan over the entire maximum format width known and different from zone to zone is. The one obtained on a measuring field of cyan color Color density value in zone N may be due to knowledge of the measuring strip structure with the color density value of the cyan measuring field in the zone N + 1 are compared.
- the color density value of each color one Measuring field type (full tone or screen tone) with the density values of the same color of neighboring fields compared.
- the respective measuring field considered e.g. cyan
- the known measuring strip structure lies the cyan measuring field in the second dosing zone by a certain number of measuring fields Besides.
- Cyan measuring fields result from the specified measuring strip structure corresponding distances.
- the size for all adjacent measurement fields 4 ⁇ (D n + 1 - D n ) 2 / (D n + 1 + D n ) 2 is calculated.
- This quantity describes the square of the relative density change between two neighboring density values.
- the mean value is calculated from this size and the mean value for all printed colors of the measuring strip from all mean values. The result obtained in this way is a parameter for the smoothness of the density curve. If the smoothness parameters are calculated for all possible constellations between the measured values and the known stripe structure, there is a minimum for a single constellation. This minimum constellation corresponds to the actual field assignment.
- the calculation of the minimum constellation is carried out in the computing device according to the invention, which as a result supplies the measured values (color density values) in correct assignment to the printing units and the ink metering zones of the inking units.
- measured values color density values
- the computing device which as a result supplies the measured values (color density values) in correct assignment to the printing units and the ink metering zones of the inking units.
- density values of unoccupied measuring fields paper white
- the by the inventive Setup to be carried out variation of the field shift according to the measuring strip structure in both Directions, i.e. starting from a one Color-assigned measuring field in any color metering zone the measured value assignment according to the stripe structure becomes Calculation of the density change described above in both Directions varied.
- This makes it possible for a further input is omitted, namely the indication whether the measuring strip of the leading edge or the trailing edge of the Print sheet (print start / print end) is assigned.
- the device according to the invention makes it unnecessary that an operator has to be entered via control elements Assignment of the first measuring field / dosing zone.
- the printed sheet 1 can be used for visual and measurement purposes Quality control placed on a base 2 become.
- the base 2 is part of a perspective in Figure 1 illustrated measuring desk.
- a measuring strip 3 is also printed on the edge of the printed sheet 1.
- the measuring strip 3 consists of a variety of the measuring fields formed during printing 4.
- the measuring fields 4 result in the measuring strips lying side by side 3 and 5 are the individual ink metering zones 5 in FIG assigned printing machine, not shown.
- the ink metering zones 5 are marked on the base 2 (measuring desk) so that the subject located on the printed sheet 1 also with regard to the zonal allocation is assessable.
- the measuring fields 4 of the color measuring strip 3 point in terms of a given arrangement within the individual colors Ink metering zones 5. This means, for example, that Measuring field of the color cyan in the individual color metering zones 5 is different in each case.
- Measuring field of the color cyan in the individual color metering zones 5 is different in each case.
- one color metering zone 5 is, for example, the measuring field of the color cyan at the third position, in the next ink metering zone the sixth position, in the next but one ink metering zone 5 again at the second position, etc.
- the densitometer measuring head 6 is on a not shown in Figure 1 Suspension articulated and motorized along the direction of extension of the measuring strip can be moved.
- the direction of movement of the densitometer measuring head 6 is in Figure 1 by the double arrow indicated.
- the densitometer measuring head 6 can additionally also a movement perpendicular to the direction of extension of the measuring strip 3.
- FIG. 2 shows the densitometer measuring head 6 according to the invention downstream evaluation device 7.
- Evaluation unit 7 supplied to the densitometer measuring head 6 is connected downstream.
- the computer of the evaluation unit 7 is still in shape with a display device 8 a monitor in operative connection, furthermore with predefined target values calculated measurement results of the Densitometer measuring head 6 also for setting commands for the Color guidance of a printing press 9 can be used.
- the evaluation unit 7 with the color guide elements (not shown in FIG. 2) of a printing press 9 in Active connection.
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- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Spectrometry And Color Measurement (AREA)
- Printing Methods (AREA)
Abstract
Description
Die Erfindung betrifft eine Vorrichtung zum densitometrischen Ausmessen von Druckprodukten gemäß dem Oberbegriff von Anspruch 1.The invention relates to a device for densitometric Measuring printed products according to the preamble of claim 1.
Zur Steuerung der Farbgebung und zur Qualitätskontrolle werden neben dem eigentlichen Sujet in Form von Streifen angeordnete Messfelder für die einzelnen Farben zusätzlich mitgedruckt. Insbesondere bei auf Bogenoffsetdruckmaschinen hergestellten Druckprodukten sind diese Messstreifen dem Druckanfang bzw. dem Druckende zugeordnet. Ein der Auslage entnommener Bogen kann dann auf eine Unterlage gelegt und neben der visuellen Qualitätsinspektion durch ein traversierendes Densitometer ausgemessen werden. Während des Traversierens des Densitometers fallen eine Menge Messdaten an, d.h. die den einzelnen Farben zugeordneten Messfelder liefern jeweils ein oder mehrere Farbdichtewerte.For controlling the coloring and for quality control are in addition to the actual subject in the form of strips arranged measuring fields for the individual colors also printed. Especially for sheetfed offset presses are the measuring strips produced Start of print or end of print assigned. One of the display removed sheet can then be placed on a base and in addition to the visual quality inspection by a traversing Densitometer can be measured. While traversing the densitometer has a lot of measurement data, i.e. provide the measuring fields assigned to the individual colors one or more color density values each.
Entsprechend der zonalen Farbdosierung ist auch der Aufbau eines derartigen Farbmessstreifens den Farbdosierzonen der Druckmaschine angepasst. So ist bei bekannten Farbdichtemessstreifen jeder Farbdosierzone ein Messfeld pro Farbe zugeordnet. Neben den als Vollton-/Rastertonfeldern ausgebildeten Messfeldern der Grundfarben (Cyan, Magenta, Yellow, Schwarz) können auch Messfelder für ein oder mehrere Sonderfarben vorgesehen sein. Auch die Messfelder für diese Sonderfarben sind bevorzugt in jeder Farbdosierzone vorgesehen, d.h. bei vier Grund- und zwei Sonderfarben sind in jeder Farbdosierzone insgesamt 6 verschiedenfarbige Messfelder plus ggf. zusätzliche Qualitätsinspektionsfelder angeordnet.The structure also corresponds to the zonal color dosage of such a color measuring strip the ink metering zones Printing press adapted. This is the case with known color density measuring strips One measuring field per color is assigned to each color metering zone. In addition to the trained as full tone / screen fields Measuring fields of the basic colors (cyan, magenta, yellow, black) can also use measuring fields for one or more spot colors be provided. Also the measuring fields for these special colors are preferably provided in each ink metering zone, i.e. at four basic and two special colors are in each color metering zone a total of 6 differently colored measuring fields plus any additional ones Quality inspection fields arranged.
Die Anordnung der den einzelnen Farben zugeordneten Messfeldern in den Dosierzonen ist bei den bekannten Farbmessstreifen unterschiedlich. Dies bedeutet, dass ein beispielsweise in der ersten Farbdosierzone der Farbe Cyan zugeordnetes Meßfeld an der dritten Messfeldposition angeordnet ist, in der zweiten Farbdosierzone einen anderen Platz (beispielsweise 5) einnimmt. Die Anordnung der den einzelnen Farben zugeordneten Messfeldpositionen variiert somit innerhalb der Farbdosierzonen, so dass über die maximale Formatbreite betrachtet jede Farbe bzw. jedes Messfeld mal an den Rändern, mal mehr in der Mitte einer Farbdosierzone liegt.The arrangement of the measuring fields assigned to the individual colors is in the metering zones with the known color measuring strips differently. This means that for example assigned to the color cyan in the first color metering zone Measuring field is arranged at the third measuring field position, in another place in the second ink metering zone (e.g. 5) occupies. The arrangement of the assigned to the individual colors Measuring field positions thus varies within the Color metering zones, so that the maximum format width looks at every color or measuring field at the edges, is more in the middle of a paint metering zone.
Zum Ausmessen der zuvorstehend kurz beschriebenen Messstreifen finden automatische Densitometeranlagen mit einem traversierenden Messkopf Verwendung. Eine derartige Densitometeranlage ist insbesondere unter der Produktbezeichnung CCI der MAN Roland Druckmaschinen AG lange bekannt. Bei diesem automatisch arbeitenden Densitometer wird ein auszumessender Bogen auf das Pult aufgelegt und an Anschlägen ausgerichtet. Bei einem ersten Erkennungslauf werden die Positionen der den einzelnen Farben zugeordneten Messfelder ermittelt und abgespeichert. In dem eigentlichen Messlauf werden dann die durch die entsprechenden Densitometerfilter gewonnenen Messwerte aufgenommen und gespeichert. Die so ermittelten Messwerte werden in Verbindung mit vorgegebenen Sollwerten vorzugsweise zur automatischen Korrektur der den einzelnen Farbdosierzonen zugeordneten Dosierelemente (Farbregelung) verwendet.For measuring the measuring strips briefly described above find automatic densitometer systems with a traversing one Measuring head use. Such a densitometer system is particularly known as CCI MAN Roland Druckmaschinen AG has been known for a long time. With this automatically working densitometer becomes a to be measured Bow placed on the desk and aligned with stops. In a first recognition run, the positions of the Measuring fields assigned to individual colors are determined and stored. In the actual measuring run, the through the corresponding densitometer filter recorded and saved. The measured values determined in this way are preferred in connection with predetermined target values for automatic correction of the individual ink metering zones assigned dosing elements (color control) used.
Der Aufbau eines Farbmessstreifens und insbesondere die Zuordnung der einzelnen Farben zu den Messfeldpositionen innerhalb der Zonen ist auf ein maximales Format abgestimmt. Wird ein derartiger Farbmessstreifen für Bogen- bzw. Druckprodukte kleineren Formates (Formatbreite) verwendet, so beginnt der Messstreifen - Zentrierung des Messstreifens zur Maschinenmitte - nicht mit der ersten Farbdosierzone sondern mit einem Messfeld bestimmter Farbe in einer dem jeweils verwendeten Druckformat entsprechenden Dosierzone. Durch Vergleich der bei einem Messlauf durch die unterschiedlichen Filter gewonnenen Farbdichtewerte können die Grenzen verschiedenfarbiger Messfelder zueinander als auch die innerhalb in einem Messfeld gelegenen optimalen Messpositionen bestimmt werden, nach wie vor ist aber nicht bekannt, welcher Farbdosierzone das erste Messfeld zugeordnet ist, d.h. ohne zusätzliche Dateneingaben bzw. Messläufe ist dem Densitometer bzw. der nachgeschalteten Regelanlage nicht bekannt, wie groß das Format ist, auf welches der jeweils verwendete Messstreifen aufkopiert wurde. Aus diesem Grund weisen bekannte Farbdichtemessanlagen und insbesondere die weiter oben stehend angegebene Densitometeranlage unterschiedliche Messmodi auf, durch welche das geschilderte Problem der Zuordnung der verschiedenfarbigen Messfelder in den einzelnen Farbdosierzonen bei der Auswertung und Zuordnung der Messdaten berücksichtigbar ist. Eine Möglichkeit dazu ist die Feldidentifikation durch Analyse der durch die verschiedenen Filter gewonnenen Farbdichtewerte. Wie aus der EP 0 370 126 B1 bekannt können verschiedenfarbige Messfelder durch Vergleich der durch die verschiedenen Filter (Sensorkanäle) gewonnenen Farbdichtewerte unterschieden werden. Auf diesem Prinzip aufbauend ist es möglich, durch einen Messlauf die Struktur eines unbekannten Messstreifens zu ermitteln, was aber einen vorherigen Erkennungslauf voraussetzt. Eine Methode zur Bestimmung der optimalen Messposition innerhalb eins identifizierten Messfeldes ist aus der EP 0274 061 B1 bekannt.The construction of a color measuring strip and in particular the Assignment of the individual colors to the measuring field positions within the zones is coordinated to a maximum format. Such a color measuring strip for sheet or printed products smaller formats (format width) used, so the measuring strip begins - centering of the measuring strip to Machine center - not with the first ink metering zone but instead with a measuring field of a certain color in one of each used printing format corresponding dosing zone. By Comparison of the in a measurement run through the different Color density values obtained from filters can limit the limits of different colors Measuring fields to each other as well as those within optimal measuring positions located in a measuring field but it is still not known which color metering zone the first measuring field is assigned, i.e. without additional Data entry or measurement runs is the densitometer or the downstream control system does not know how big that Format is on which the measuring strip used in each case was copied. For this reason, known color density measuring systems and in particular the one given above Densitometer system different measurement modes on through which the described problem of assigning the different colored measuring fields in the individual color metering zones can be taken into account when evaluating and assigning the measurement data is. One way to do this is by field identification by analyzing the ones obtained through the different filters Color density values. As known from EP 0 370 126 B1 can measure fields of different colors by comparing the obtained through the various filters (sensor channels) Color density values can be distinguished. On this principle It is possible to build up the structure by means of a measuring run of an unknown measuring strip, but what one requires previous detection run. A method for Determination of the optimal measuring position within one identified Measuring field is known from EP 0274 061 B1.
Eine weitere Möglichkeit zur Berücksichtigung der sich bei
unterschiedlichen Formaten ergebenen unterschiedlichen Zuordnung
von Messfeldern in den einzelnen Dosierzonen ist eine
manuelle Eingabe, wo bzw. in welcher Zone das erste, beispielsweise
Cyan-farbige, Messfeld liegt. Der Bediener hat
hierzu vor dem Ausmessen eines ersten Bogens der Messanlage
über Bedienelemente einzugeben, dass beim gegebenen Format in
Messrichtung des Densitometers das Cyan-Messfeld in der
ersten Zone des Bogens auf Position 3 liegt bzw. dass in
Messrichtung des Densitometers das erste Messfeld der Zone
ganz links bspw. die Farbe Magenta hat. Durch diese einzugebende
Information ist dann unter Berücksichtigung des bekannten
Messstreifenabbaues (Zuordnung / Anordnung der einzelnen
verschiedenfarbigen Messfelder in den Dosierzonen) bestimmbar,
in welcher Dosierzone der Messstreifen beginnt.Another way to take into account
different formats result in different assignment
of measuring fields in the individual dosing zones is one
manual entry, where or in which zone the first one, for example
Cyan-colored, measuring field lies. The operator has
for this purpose before measuring a first sheet of the measuring system
to enter via controls that for the given format in
Direction of measurement of the densitometer the cyan measuring field in the
first zone of the arch is in
Die zuvorstehend skizzierten Möglichkeiten zur Berücksichtigung entsprechend dem Bedruckstoff-Format angeordneter Farbmessstreifen hat den Nachteil, dass durch falsche Eingabe nicht korrekte Messwerte gewonnen bzw. die gewonnenen Messwerte nicht den entsprechenden Farbdosierzonen zugeordnet werden können. Die Ableitung von Stellbefehlen für die zonale Farbführung ist dann nicht möglich. Auch eventuell nötige Erkennungsläufe sind wegen des zusätzlichen Zeitaufwandes als nachteilig anzusehen.The options outlined above for consideration Color measuring strips arranged according to the substrate format has the disadvantage that by incorrect input incorrect measurement values obtained or the measurement values obtained not assigned to the corresponding ink metering zones can be. Deriving control commands for the zonal Color guidance is then not possible. Also possibly necessary Detection runs are considered due to the additional time involved to look at disadvantageously.
Aufgabe der vorliegenden Erfindung ist es daher, eine Einrichtung zum densitometrischen Ausmessen von Druckprodukten gemäß dem Oberbegriff von Anspruch 1 derartig zu erweitern, so dass eine einfache und fehlersichere Zuordnung der in den einzelnen Farbdosierzonen angeordneten Messfeldfarben möglich ist.The object of the present invention is therefore a device for densitometric measurement of printed products to expand in accordance with the preamble of claim 1, so that a simple and fail-safe assignment of the in the Measuring field colors arranged in individual color metering zones possible is.
Gelöst wird diese Aufgabe durch die kennzeichnenden Merkmale von Anspruch 1. Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.This task is solved by the characteristic features of claim 1. Developments of the invention result from the subclaims.
Gemäß der Erfindung ist vorgesehen, dass durch die dem Densitometer nachgeschaltete und eine Recheneinrichtung umfassende Auswerteeinheit ein Vergleich der Farbdichtewerte eines Messfeldes mit den benachbarten Messfeldern der gleichen Farbe und Messfeldart (Vollton bzw. Rasterton) vorgenommen wird. Berücksichtigt wird dabei, dass innerhalb eines Messstreifens bekannten Aufbaus die Anordnung der beispielsweise der Druckfarbe Cyan zugeordneten Messfelder über die gesamte maximale Formatbreite bekannt und von Zone zu Zone unterschiedlich ist. Der an einem Messfeld der Farbe Cyan gewonnene Farbdichtewert in der Zone N kann aufgrund der Kenntnis des Messstreifenaufbaues mit dem Farbdichtewert des CyanMessfeldes in der Zone N+1 verglichen werden. Dabei wird ausgenutzt, dass aufgrund des Farbquerflusses und insbesondere der Farbverreibung bei Offsetdruckmaschinen der Farbdichteverlauf über die Maschinenbreite flach verläuft, d.h. die Farbdichtewerte der Cyan-Messfelder in den Dosierzonen N-1, N, N+1 keine großen Sprünge relativ zueinander aufweisen.According to the invention it is provided that by the densitometer downstream and comprising a computing device Evaluation unit a comparison of the color density values of a Measuring field with the neighboring measuring fields of the same Color and measuring field type (full tone or screen tone) becomes. It is taken into account that within a measuring strip known structure, the arrangement of, for example measuring fields assigned to the printing ink cyan over the entire maximum format width known and different from zone to zone is. The one obtained on a measuring field of cyan color Color density value in zone N may be due to knowledge of the measuring strip structure with the color density value of the cyan measuring field in the zone N + 1 are compared. Doing so exploited that due to the color cross flow and in particular the color rubbing in offset printing machines the color density curve runs flat across the machine width, i.e. the Color density values of the cyan measuring fields in the dosing zones N-1, N, N + 1 do not have large jumps relative to one another.
Erfindungsgemäß wird nun für die vorhandenen Messfelder in den Dosierzonen in Verbindung mit dem bekannten Aufbau des Messstreifens der Farbdichtewert einer jeden Farbe einer Messfeldart (Vollton bzw. Rasterton) mit den Dichtewerten der gleichen Farbe der benachbarten Felder verglichen. Dazu wird zunächst angenommen, dass das jeweils betrachtete Messfeld (z.B. Cyan) in der ersten Farbdosierzone liegt. Aufgrund des bekannten Messstreifenaufbaues liegt dann das Cyan-Messfeld in der zweiten Dosierzone um eine bestimmte Anzahl von Messfeldern daneben. Für das dritte, vierte und die weiteren Cyan-Messfelder ergeben sich aus dem vorgegebenen Messstreifenaufbau entsprechende Abstände.According to the invention, for the existing measuring fields in the dosing zones in connection with the known structure of the Measuring strip the color density value of each color one Measuring field type (full tone or screen tone) with the density values of the same color of neighboring fields compared. This will initially assumed that the respective measuring field considered (e.g. cyan) is in the first ink metering zone. Because of the the known measuring strip structure then lies the cyan measuring field in the second dosing zone by a certain number of measuring fields Besides. For the third, fourth and the others Cyan measuring fields result from the specified measuring strip structure corresponding distances.
Liegt nun das erste gemessene Messfeld für die Farbe Cyan nicht in der ersten Farbdosierzone (max. Druckformat) sondern in der Zone X, so führt der oben angesprochene Vergleich dazu, dass der Farbdichtewert des betrachteten Cyan-Messfeldes mit einem Farbdichtewert einer anderen Farbe verglichen wird. Die miteinander zu vergleichenden Farbdichtewerte passen nicht zueinander und weisen eine größere Differenz auf. Erst wenn die Anzahl der Nachbarfelder, in welchen das zur gleichen Farbe gehörende Messfeld der benachbarten Dosierzone liegt, genau der Dosierzone des betrachteten Messfeldes entspricht, ergeben sich wieder Farbdichtewerte, welche - aufgrund des Farbquerflusses und der seitlichen Verreibung - einen entsprechenden glatten Verlauf zueinander aufweisen.Now is the first measured measuring field for the color cyan not in the first ink metering zone (max. print format) but in zone X, this is the comparison mentioned above the color density value of the cyan measuring field under consideration with a color density value of another color is compared. The color density values to be compared do not match and have a larger size Difference on. Only when the number of neighboring fields, in which the measuring field of the neighboring color belonging to the same color Dosing zone is exactly the dosing zone of the considered Corresponds to the measuring field, there are color density values again, which - due to the color cross flow and the lateral Rubbing - a corresponding smooth course to each other exhibit.
Werden aufeinanderfolgende Farbdichtewerte eines Messstreifens anhand des bekannten Streifenaufbaues richtig interpretiert, so ergibt sich erfindungsgemäß für alle Felder der gleichen Farbe ein glatter Dichteverlauf, d.h. die Farbdichtewerte weisen zu ihren jeweiligen Nachbarfeldern kleine Differenzen auf. Eine falsche Interpretation der Farbdichtewerte liefert dagegen einen sprunghaften Dichteverlauf, da in diesem Fall die Farbdichtwerte unterschiedlicher Farben miteinander verglichen werden. Verschiebt man die Messwert-Reihenfolge, also die Reihenfolge der Anordnung der den einzelnen Farben zugeordneten Messfelder entlang dem bekannten Streifenaufbau, so ergibt sich innerhalb einer Wiederhol-Sequenz (Periode des Messstreifens) nur einmal ein glatter Dichteverlauf. Auf diese Weise lassen sich sämtliche Messwerte eindeutig einem Feld des Messstreifens zuordnen, es läßt sich es also feststellen, dass das erste Messfeld des Messstreifens in der Zone X liegt bzw. dass das erste Cyan-Messfeld in eben dieser Zone liegt.Are successive color density values of a measuring strip interpreted correctly based on the known stripe structure, so according to the invention for all fields same color, a smooth density curve, i.e. the color density values point small to their respective neighboring fields Differences on. An incorrect interpretation of the color density values delivers an abrupt density curve, because in in this case the color density values of different colors be compared with each other. If you move the measurement order, thus the order of the arrangement of the measurement fields assigned to individual colors along the known Stripe build-up results in a repeat sequence (Period of the measuring strip) only once a smooth Density curve. In this way, all measured values can be clearly assign a field of the measuring strip, it leaves so it is found that the first measuring field of the measuring strip lies in zone X or that the first cyan measuring field is in this zone.
Gemäß einer bevorzugten Weiterbildung der Erfindung ist
vorgesehen, dass für alle benachbarten Messfelder die Größe
Weiterbildend kann vorgesehen sein, dass die durch die erfindungsgemäße Einrichtung durchzuführende Variation der Feldverschiebung entsprechend dem Messstreifenaufbau in beiden Richtungen durchlaufen wird, d.h. ausgehend von einem einer Farbe zugeordneten Messfeld in einer beliebigen Farbdosierzone wird die Messwertezuordnung gemäß Streifenaufbau zur Berechnung der oben geschilderten Dichteänderung in beiden Richtungen variiert. Dadurch ist es möglich, dass auch eine weitere Eingabe entfallen, nämlich die Angabe dahingehend, ob der Messstreifen der Vorderkante oder der Hinterkante des Druckbogens (Druckanfang/Druckende) zugeordnet ist.In a further development it can be provided that the by the inventive Setup to be carried out variation of the field shift according to the measuring strip structure in both Directions, i.e. starting from a one Color-assigned measuring field in any color metering zone the measured value assignment according to the stripe structure becomes Calculation of the density change described above in both Directions varied. This makes it possible for a further input is omitted, namely the indication whether the measuring strip of the leading edge or the trailing edge of the Print sheet (print start / print end) is assigned.
Durch die erfindungsgemäße Einrichtung ist es entbehrlich, dass eine Bedienperson eine über Bedienelemente einzugebende Zuordnung des ersten Messfeldes / Dosierzone vornimmt. The device according to the invention makes it unnecessary that an operator has to be entered via control elements Assignment of the first measuring field / dosing zone.
Fehlinterpretationen und fehlerhafte Zuordnungen von Messwerten zu Farbdosierzonen werden so ausgeschlossen.Misinterpretation and incorrect assignment of measured values to color metering zones are excluded.
Des weiteren erfolgt die Erläuterung eines Ausführungsbeispiels der Erfindung anhand der Zeichnung. Es zeigt:
- Fig. 1
- eine Farbdichtemessanlage in perspektivischen Ansicht, und
- Fig. 2
- die Komponenten einer Farbdichtemessanlage mit der erfindungsgemäßen Auswerteeinheit.
- Fig. 1
- a color density measuring system in perspective view, and
- Fig. 2
- the components of a color density measuring system with the evaluation unit according to the invention.
Ein auf einer nicht dargestellten Bogenoffsetdruckmaschine hergestellter Druckbogen 1 kann zur visuellen sowie messtechnischen Qualitätskontrolle auf eine Unterlage 2 aufgelegt werden. Die Unterlage 2 ist Teil eines in Figur 1 perspektivisch dargestellten Messpultes.One on a sheetfed offset press, not shown The printed sheet 1 can be used for visual and measurement purposes Quality control placed on a base 2 become. The base 2 is part of a perspective in Figure 1 illustrated measuring desk.
An der Kante des Druckbogens 1 ist ein Messstreifens 3 mitgedruckt.
Der Messstreifen 3 besteht aus einer Vielzahl durch
die beim Druck verwendeten Farben gebildeten Messfelder 4.
Die Messfelder 4 ergeben nebeneinander liegend den Messstreifen
3 und sind den einzelnen Farbdosierzonen 5 der in Figur 1
nicht dargestellten Druckmaschine zugeordnet. Die Farbdosierzonen
5 sind auf der Unterlage 2 (Messpult) markiert, so dass
das auf dem Druckbogen 1 befindliche Sujet auch hinsichtlich
der zonalen Zuordnung beurteilbar ist.A measuring
Die Messfelder 4 des Farbmessstreifens 3 weisen hinsichtlich
den einzelnen Farben eine vorgegebene Anordnung innerhalb der
Farbdosierzonen 5 auf. Dies bedeutet, dass beispielsweise das
Messfeld der Farbe Cyan in den einzelnen Farbdosierzonen 5 an
jeweils unterschiedlicher Stelle liegt. In der einen Farbdosierzone
5 liegt beispielsweise das Messfeld der Farbe Cyan
an der dritten Position, in der nächsten Farbdosierzone an
der sechsten Position, in der übernächsten Farbdosierzone 5
wiederum an der zweiten Position usw.. Für die übrigen Druckfarben
sowie deren Zuordnung zu den Farbdosierzonen 5 gilt
entsprechendes.The measuring fields 4 of the
Der den Messstreifen 3 aufweisende und auf der Unterlage 2
des Messpultes befindliche Druckbogen 1 wird von einem traversierenden
Densitometer-Messkopf 6 abgetastet. Der Densitometer-Messkopf
6 ist an einer in Figur 1 nicht dargestellten
Aufhängung angelenkt und motorisch entlang der Erstreckungssrichtung
des Messstreifens verfahrbar. Die Bewegungsrichtung
des Densitometer-Messkopfes 6 ist in Figur 1 durch den Doppelpfeil
angedeutet. Der Densitometer-Messkopf 6 kann zusätzlich
auch eine Bewegung senkrecht zur Erstreckungsrichtung
des Messstreifens 3 ausführen.The measuring
Figur 2 zeigt die erfindungsgemäß dem Densitometer-Messkopf 6
nachgeschaltete Auswerteeinrichtung 7. Die beim Abtasten der
Messfelder 4 des Messstreifens 3 anfallenden Messdaten des
Densitometer-Messkopfes 6 werden einer als Rechner ausgebildeten
Auswerteeinheit 7 zugeführt, welche dem DensitometerMesskopf
6 nachgeschaltet ist. Der Rechner der Auswerteeinheit
7 steht weiterhin mit einer Anzeigeeinrichtung 8 in Form
eines Monitors in Wirkverbindung, ferner können die mit
vorgegebenen Soll-Werten verrechneten Messergebnisse des
Densitometer-Messkopfes 6 auch zu Stellbefehlen für die
Farbführung einer Druckmaschine 9 verwendet werden. Demzufolge
steht die Auswerteeinheit 7 mit den Farbführungsorganen
(in Figur 2 nicht dargestellt) einer Druckmaschine 9 in
Wirkverbindung. FIG. 2 shows the
Durch die als Rechner ausgebildete und dem Densitometer-Messkopf
6 nachgeschalteter Auswerteeinheit erfolgt das
erfindungsgemaß vorgesehene und voranstehend beschriebene
Vergleichen der Densitometer-Messwerte der Messfelder 3
jeweils einer Farbe benachbarter Farbdosierzonen 5. Through the computer-designed and the
- 11
- DruckbogenPrinted sheet
- 22
- Unterlage (Messpult)Pad (measuring desk)
- 33
- MessstreifenMeasuring strips
- 44
- Messfeld (Farbmessfeld)Measuring field (color measuring field)
- 55
- Farbdosierzone (Dosierzone)Ink dosing zone (dosing zone)
- 66
- Densitometer-MesskopfDensitometer measuring head
- 77
- Auswerteeinheit (Rechner)Evaluation unit (computer)
- 88th
- Anzeigeeinrichtung (Monitor)Display device (monitor)
- 99
- DruckmaschinePrinting press
Claims (3)
dadurch gekennzeichnet,
dass die Auswerteeinheit (7) einen Rechner umfasst, der Informationen über die Anordnung der Messfelder (4) der gedruckten Farben in den einzelnen Dosierzonen (5) gespeichert enthält und in welchem die Farbdichtewerte eines Messfeldes (4) mit den sich entsprechend dem Aufbau des Messstreifens (3) ergebenen Farbdichtewerten von benachbarten Messfeldern (4) der gleichen Farbe und Messfeldart vergleichbar sind.Device for the densitometric measurement of printed products, in particular printed sheets produced on sheet-fed offset printing presses, with a densitometer measuring head which can be moved along a measuring strip of several measuring fields of a measuring field type, the signals of which can be converted in a downstream evaluation unit to color density values which can be assigned to the ink metering zones,
characterized,
that the evaluation unit (7) comprises a computer which contains information about the arrangement of the measuring fields (4) of the printed colors in the individual dosing zones (5) and in which the color density values of a measuring field (4) correspond with the structure of the measuring strip (3) resultant color density values of neighboring measuring fields (4) of the same color and measuring field type are comparable.
dadurch gekennzeichnet,
dass durch den Rechner der Auswerteeinheit (7) in Verbindung mit der Zuordnung der Messfelder (4) zu den einzelnen Farbdosierzonen (5) eine Identifikation des Messstreifens (3) durchführbar ist.Device according to claim 1,
characterized,
that the computer of the evaluation unit (7) in connection with the assignment of the measuring fields (4) to the individual ink metering zones (5) can identify the measuring strip (3).
dadurch gekennzeichnet,
dass durch den Rechner der Auswerteeinheit (7) zum Vergleichen des Farbdichtewertes (Dn) eines Messfeldes (4) der Zone (n) mit dem Farbdichtewert (Dn+1) eines Messfeldes (4) in einer benachbarter Zone (n+1) die Größe
characterized,
that the computer of the evaluation unit (7) for comparing the color density value (D n ) of a measuring field (4) of the zone (n) with the color density value (D n + 1 ) of a measuring field (4) in an adjacent zone (n + 1) the size
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE29916379U | 1999-09-17 | ||
| DE29916379U DE29916379U1 (en) | 1999-09-17 | 1999-09-17 | Device for the densitometric measurement of printed products |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1084843A1 true EP1084843A1 (en) | 2001-03-21 |
| EP1084843B1 EP1084843B1 (en) | 2003-01-15 |
Family
ID=8079052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00117892A Expired - Lifetime EP1084843B1 (en) | 1999-09-17 | 2000-08-19 | Device for densitometric measurement of printed products |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6446555B1 (en) |
| EP (1) | EP1084843B1 (en) |
| JP (1) | JP2001088273A (en) |
| AT (1) | ATE231072T1 (en) |
| DE (2) | DE29916379U1 (en) |
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|---|---|---|---|---|
| EP1273444A3 (en) * | 2001-07-04 | 2006-11-29 | Dainippon Screen Mfg. Co., Ltd. | Patch measurement device |
| DE102008041430A1 (en) * | 2008-08-21 | 2010-02-25 | Koenig & Bauer Aktiengesellschaft | Method for checking at least one measured value determined in a running printing process of a printing machine for its plausibility |
| WO2010020564A2 (en) * | 2008-08-21 | 2010-02-25 | Koenig & Bauer Aktiengesellschaft | Method for assessing the plausibility of at least one measured value determined in a printing press |
| WO2010020566A1 (en) * | 2008-08-21 | 2010-02-25 | Koenig & Bauer Aktiengesellschaft | Method for assessing the plausibility of at least one measured value determined in a printing press |
| DE102008041426A1 (en) * | 2008-08-21 | 2010-02-25 | Koenig & Bauer Aktiengesellschaft | Printing substrate e.g. banknote paper, utilizing method for use in e.g. offset sheet-fed printing machine, involves testing ink density defined in ink zone of inking unit in relation to ink density determined in adjacent ink zone |
| DE102004021601B4 (en) * | 2004-05-03 | 2020-10-22 | Heidelberger Druckmaschinen Ag | Inline measurement and control for printing machines |
| WO2023016861A1 (en) | 2021-08-11 | 2023-02-16 | Koenig & Bauer Ag | Method for ink control in a printing press |
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| JP3880831B2 (en) * | 2001-10-10 | 2007-02-14 | 大日本スクリーン製造株式会社 | Ink preset method |
| JP2003118085A (en) * | 2001-10-10 | 2003-04-23 | Dainippon Screen Mfg Co Ltd | Printer |
| CA2709370C (en) * | 2001-10-15 | 2012-11-27 | Toppan Printing Co., Ltd. | Printing method, printed matter, and printing control device |
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| US20040109161A1 (en) * | 2002-12-06 | 2004-06-10 | Stranzl John E. | Method and system for processing color-measurement data |
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| EP2247449B1 (en) * | 2008-03-01 | 2018-10-31 | Hewlett-Packard Development Company, L.P. | Detecting colorants within carrier liquid |
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| DE102013109920A1 (en) * | 2013-09-10 | 2015-03-12 | Manroland Web Systems Gmbh | Method for printing a substrate |
| WO2017219258A1 (en) | 2016-06-22 | 2017-12-28 | Hewlett-Packard Development Company, L.P. | Density modulated auto-duplexing |
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| EP0064024A1 (en) * | 1981-04-03 | 1982-11-03 | GRETAG Aktiengesellschaft | Method and device for the colorimetric analysis of a printed colour test scale |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1273444A3 (en) * | 2001-07-04 | 2006-11-29 | Dainippon Screen Mfg. Co., Ltd. | Patch measurement device |
| US7202973B2 (en) | 2001-07-04 | 2007-04-10 | Dainippon Screen Mfg. Co., Ltd. | Patch measurement device |
| DE102004021601B4 (en) * | 2004-05-03 | 2020-10-22 | Heidelberger Druckmaschinen Ag | Inline measurement and control for printing machines |
| WO2010020564A3 (en) * | 2008-08-21 | 2010-07-01 | Koenig & Bauer Aktiengesellschaft | Method for assessing the plausibility of at least one measured value determined in a printing press |
| WO2010020566A1 (en) * | 2008-08-21 | 2010-02-25 | Koenig & Bauer Aktiengesellschaft | Method for assessing the plausibility of at least one measured value determined in a printing press |
| DE102008041426A1 (en) * | 2008-08-21 | 2010-02-25 | Koenig & Bauer Aktiengesellschaft | Printing substrate e.g. banknote paper, utilizing method for use in e.g. offset sheet-fed printing machine, involves testing ink density defined in ink zone of inking unit in relation to ink density determined in adjacent ink zone |
| WO2010020564A2 (en) * | 2008-08-21 | 2010-02-25 | Koenig & Bauer Aktiengesellschaft | Method for assessing the plausibility of at least one measured value determined in a printing press |
| DE102008041430B4 (en) * | 2008-08-21 | 2011-12-08 | Koenig & Bauer Aktiengesellschaft | Method for checking at least one measured value determined in a running printing process of a printing machine for its plausibility |
| US8100057B2 (en) | 2008-08-21 | 2012-01-24 | Koenig & Bauer Aktiengesellschaft | Method for regulating the ink in a printing press |
| US8176847B2 (en) | 2008-08-21 | 2012-05-15 | Koenig & Bauer Aktiengesellschaft | Method for assessing the plausibility of at least one measured value determined in a printing press |
| DE102008041426B4 (en) * | 2008-08-21 | 2014-09-04 | Koenig & Bauer Aktiengesellschaft | Method for use in a printing machine with at least one inking unit |
| DE102008041430A1 (en) * | 2008-08-21 | 2010-02-25 | Koenig & Bauer Aktiengesellschaft | Method for checking at least one measured value determined in a running printing process of a printing machine for its plausibility |
| WO2023016861A1 (en) | 2021-08-11 | 2023-02-16 | Koenig & Bauer Ag | Method for ink control in a printing press |
| DE102021120841A1 (en) | 2021-08-11 | 2023-02-16 | Koenig & Bauer Ag | Process for color control in a printing press |
| US11932004B1 (en) | 2021-08-11 | 2024-03-19 | Koenig & Bauer Ag | Method for ink control in a printing press |
Also Published As
| Publication number | Publication date |
|---|---|
| DE50001077D1 (en) | 2003-02-20 |
| JP2001088273A (en) | 2001-04-03 |
| US6446555B1 (en) | 2002-09-10 |
| DE29916379U1 (en) | 1999-12-09 |
| EP1084843B1 (en) | 2003-01-15 |
| ATE231072T1 (en) | 2003-02-15 |
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