EP0114914B1 - Dispositif pour détecter et évaluer des bandes de mesure colorimétriques sur une feuille d'impression - Google Patents

Dispositif pour détecter et évaluer des bandes de mesure colorimétriques sur une feuille d'impression Download PDF

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Publication number
EP0114914B1
EP0114914B1 EP83100841A EP83100841A EP0114914B1 EP 0114914 B1 EP0114914 B1 EP 0114914B1 EP 83100841 A EP83100841 A EP 83100841A EP 83100841 A EP83100841 A EP 83100841A EP 0114914 B1 EP0114914 B1 EP 0114914B1
Authority
EP
European Patent Office
Prior art keywords
sheet
printed sheet
values
densitometer
coordinate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83100841A
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German (de)
English (en)
Other versions
EP0114914A1 (fr
Inventor
Alfred Dorn
Peter Dipl.-Ing. Schramm
Siegfried Schuhmann
Oded Zingher
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Manroland AG
Original Assignee
MAN Roland Druckmaschinen AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8190271&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0114914(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by MAN Roland Druckmaschinen AG filed Critical MAN Roland Druckmaschinen AG
Priority to EP83100841A priority Critical patent/EP0114914B1/fr
Priority to AT83100841T priority patent/ATE26674T1/de
Priority to JP58211099A priority patent/JPS59155710A/ja
Priority to US06/574,875 priority patent/US4648048A/en
Publication of EP0114914A1 publication Critical patent/EP0114914A1/fr
Application granted granted Critical
Publication of EP0114914B1 publication Critical patent/EP0114914B1/fr
Expired legal-status Critical Current

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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

Definitions

  • the invention relates to a device for determining and evaluating color measurement fields on a printed sheet lying on a coordinate measuring table with a densitometer.
  • Devices of this type are known from EP-A 0064024 and DE-A 2901 980. These devices contain densitometers that traverse a linearly extending measuring field strip. Approaching control fields located anywhere on the printed sheet is not intended.
  • the guides of the densitometer In order to simplify the recurring evaluation of color measurement fields on a printed sheet by means of a densitometer, the guides of the densitometer must be held on rails so that they can move in the x-y direction. In the case of constant repetition of individual measurement processes with the same printed sheets, positioning the densitometer by hand is ruled out because of the inaccuracy that occurs.
  • the problem is particularly difficult with different types of paper, e.g. thin printing paper and thick cardboard.
  • the orders in cardboard force the maximum use of the areas to be printed in such a way that there is no space or limited space for color measuring fields on the printed sheet at the most different positions of the printed sheet. I.e.
  • the color measurement fields are always at different locations for the different print jobs, depending on where there is space for a color measurement field between the print images.
  • the object of the invention is to make all areas of the printing sheet detectable for measuring purposes, whereby difficulties in recognizing the position of the printing sheet on the coordinate measuring table on lighting and inaccurately lying the printing sheet on the coordinate measuring table are avoided.
  • the object is achieved in a device of the type mentioned at the outset by the fact that the position of the color measurement fields on the printed sheet can be detected by means of a device and stored in a first memory, that the position of the printed sheet on the coordinate measuring table can be determined by means of optical scanning elements and It can be stored in a second memory that the values determined by the optical scanning elements can be used to convert the coordinate values from a fixed reference point on the printed sheet to a fixed reference point on the coordinate measuring table and that the densitometer, which can be moved in two directions, can be repeated onto the color measuring fields by means of the stored values the printing sheet is movable.
  • the position data or the coordinates of the color measuring fields of the printed sheet are entered directly by hand using a keyboard on the coordinate measuring table.
  • the printing sheet lies on the coordinate measuring table and the densitometer is brought into position above a color measuring field by means of a target device, and the coordinates of the color measuring fields of the printing sheet are stored by pressing a button on an operating console.
  • the third embodiment provides for the data coordinates of the color measurement fields of each individual print order to be imported on a tape.
  • the present device enables the color measurement fields to be distributed over the printing sheet according to the respectively resulting conditions.
  • the color measuring fields can be arranged in a particularly advantageous manner distributed over the entire printed sheet. With the coordinate measuring table and the storage locations as well as their processing, it is then possible to automatically approach and measure these measuring points via the arch.
  • a photoelectric matrix for example an image sensor at one corner, is sufficient to determine the exact position of the printed sheet on the coordinate measuring table.
  • the accuracy increases if e.g. Three row arrays, two of which are arranged on the base side and one on a transverse side, are conveniently positioned on the coordinate measuring table.
  • the arrays are read out sequentially.
  • the size of the measured values is proportional to the incident light and the integration time.
  • the values read from the arrays are digitized and stored in a downstream memory, which is operated by a control circuit (microprocessor).
  • the measured values emitted by the arrays are stored in a first memory in the state not covered by the arch, and the measured values of the arrays covered by an arch are stored in a second memory.
  • the minima and maxima are found, by means of which the position of the arc is defined at a reference point.
  • the course of these difference values, in particular the turning point in the course of the curve determined by differentiating, can be defined as an arc edge.
  • the position of the sheets on the coordinate measuring table can be measured densitometrically, without the printed sheets having to rest against, or be aligned with, fixed stops of the table.
  • the densitometer runs over a printed sheet edge, which lies in a particularly advantageous manner on a base forming a contrast to the printed sheet edge, and thereby determines the position of the printed sheet on the coordinate measuring table.
  • the calculated values of the above measurement process can serve as correction factors for the measurement coordinates defined for the first time, with which each printed sheet lying on the coordinate measuring table can be measured in any position.
  • Another major advantage is The fact that the edges of the sheets to be measured are not flat, but are slightly kinked or wavy, it is also possible to determine the position coordinates on the coordinate measuring table, since a drop shadow of the sheet edge on the photoelectric matrix or the image sensors is not necessary for the reasons mentioned above.
  • Image sensors 2, 3 are provided on the sheet base 1 at a defined distance (A, B) from a reference point (C). Each of these image sensors 2, 3 has a defined number of measuring points arranged in a row, which, when the light falls on them, emit an electrical signal which corresponds in size to the incident quantity of light. Each of these image sensors 2, 3 is assigned two memories 4, 5, the storage capacity of which corresponds to the number of measuring points of the image sensors. A computer 6 checks the memories 4, 5 and, in accordance with the contents of the memory, transmits a value to another computer 7, which processes all the values of the computer 6 and carries out a position calculation.
  • Both image sensors 2, 3 are not covered by any sheet and give a calibration value per measurement point to the memory 4. This is done by means of a “calibration” command. Then a sheet 8 is placed on the sheet base 1 and positioned so that the image sensors 2, 3 are partially covered. Then «determine position».
  • the values now output by the image sensors 2, 3 are then stored in the memory 5 and linked to calibration values by the computer 6.
  • the difference in the memory contents is now processed by the computers 6 and fed to a further computer 7, which calculates the actual position of the sheet.
  • the difference between the target and actual position then serves as a correction value for determining the coordinate values for controlling a densitometer or for an optical display.
  • FIG. 1 shows a sheet base with image sensors 2, 3 attached to it, which are arranged in a line at a distance B from a fixed reference point C.
  • the measuring process for measuring a printed sheet 8 on the sheet base 1 becomes more precise if an additional image sensor 2.2 is arranged on a side edge.
  • a significant simplification of the entire measuring process is possible if instead of the image sensors 2, 3, 2.1 only a matrix sensor 2.1 is used which contains 500 x 500 recording elements.
  • the matrix sensor 2.1 can be arranged at each of the four corners of the printed sheet 8. Color measuring fields 14 to 14.3 are randomly distributed on the printed sheet 8.
  • the image sensors 2, 3 pass on their measured values to memories 4, 5 or 4.1, 5.1 lying parallel to one another.
  • the first values of the image sensor 2 are stored by the uncovered arrays on a memory area 4, and the second values of the arrays of the image sensor 2 covered by a printed sheet are stored on a second memory area 5.
  • the maxima and minima are found which define the position of the printed sheet 8 at the reference point C.
  • the comparison values from the computer 6 and 6.1 are summarized in the computer 7.
  • the printing sheets 8 can thus be recorded densitometrically in the x-y direction without the printing sheets 8 having to be aligned with their edges at fixed stops.
  • FIG. 3 shows the technical design of a coordinate measuring table 1.1.
  • two image sensors 2, 3 are provided in recesses 1.2 of the sheet base 1.
  • Bearings 12, 13 for a traverse 15, which is thus held in a mobile manner, are on each individual guide rail 11.
  • the direction of movement of the cross member 15 is possible parallel to the guide rails 11 over the entire coordinate measuring table 1.1.
  • End stops 16 prevent the cross member 15 from sliding over the ends of the guide rail 11.
  • a densitometer 8.1 and a target device 9 can be moved along the crossmember 15 in the longitudinal direction of the coordinate table 1.1.
  • the densitometer 8.1 and the target device 9 can be brought over any color measurement field 14 to 14.3 and measured or positioned.
  • the target device 9 contains an optical system by means of which the exact position above a sighted color measurement field 14 to 14.3 is made visible on a screen with cross hair 20, whereupon the exact coordinates of the target device 9 and thus the color measurement fields 14 to 14.3 can be read and saved.
  • the reading process is triggered manually by pressing a button. Alternatively, it is via the keyboard 10 of an operator tion console 18 possible to enter individual coordinates by hand.
  • the movements of the densitometer 8.1 are divided into x and y directions on the coordinate measuring table 1.1, which can be carried out by means of stepper motors.
  • a stepper motor is arranged on the bearings 12, 13 on the narrow sides of the coordinate measuring table 1.1.
  • the second direction of movement of the densitometer 8.1 and the target device 9 is carried out by a further stepping motor along the cross member 15.
  • the stepper motors are controlled automatically via the coordinate data when a print sheet 8 is placed on demand.
  • a contrast surface 19 for the densitometer 8.1 has proven to be particularly advantageous.
  • the densitometer 8.1 is calibrated by means of a measuring element 17.
  • the measuring element 17 is located outside the sheet base 1 on the coordinate measuring table 1.1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Length Measuring Devices With Unspecified Measuring Means (AREA)
  • Spectrometry And Color Measurement (AREA)

Claims (8)

1. Dispositif pour détecter et évaleur des bandes de mesure colorimétriques sur une feuille d'impression, qui se trouve sur une table de mesure de coordonnées, à l'aide d'un densitomètre, caractérisé en ce que des éléments d'exploration optiques (2, 3, 2.1, 2.2, 8.1) sont disposés sur la table de mesure de coordonnées (1.1) pour analyser la position de la feuille d'impression (8) sur la table de mesure de coordonnées (1.1), en ce que des mémoires (4, 5, 4.1, 5.1) sont associées aux éléments d'exploration (2, 3, 2.1, 2.2, 8.1) pour recevoir les valeurs de mesure, en ce que sont prévus des moyens (9, 10) pour la détéction et le stockage des positions des bandes de mesure colorimétriques (14-14.3) sur la feuille d'impression (8), en ce que les positions des bandes de mesure colorimétriques (14-14.3) peuvent être transformées au moyen des valeurs détectées par les éléments d'exploration optiques (2, 3, 2.1, 2.2, 8.1) par comparaison entre la position réelle et la position théorique de la feuille en tant que valeurs de coordonnées d'un point de référence fixé au choix sur la feuille (8) à un point de référence (c) fixé sur la table de mesure de coordonnées (1.1), et en ce que le densitomètre (8.1) déplaçable dans les directions x et y est déplaçable à l'aide des valeurs stockées de façon récurrente sur les bandes de mesure colorimétriques (14-14.3) de la feuille d'impression.
2. Dispositif selon la revendication 1, caractérisé en ce que la position des bandes de mesure colorimétriques (14-14.3) peut être détectée au moyen d'un viseur (9) et peut être appelée aussi souvent que souhaité en tant que valeurs de coordonnées.
3. Dispositif selon la revendication 1, caractérisé en ce que la position des bandes de mesure colorimétriques (14-14.3) peut être enregistrée au moyen d'un clavier (10) de la table de mesure de coordonnées (1.1).
4. Dispositif selon la revendication 1, caractérisé en ce que, pour des ordres répétés, la position des bandes de mesure colorimétriques (14-14.3) peut être enregistrée au moyen d'une bande magnétique.
5. Dispositif selon la revendication 1, caractérisé en ce que, pour la reconnaissance de position de la feuille d'impression (8), des détecteurs d'image (2,3), ayant une pluralité de points de mesure disposés à chaque fois parallèlement l'un par rapport à l'autre en une ligne, sont disposés dans des évidements (1.2) de la table de mesure de coordonnées (1.1), lesquels sont associés à des mémoires (4, 5, 4.1, 5.1), dont la capacité de stockage correspond au moins au nombre de points de mesure d'une rangée, en ce que les valeurs de mesure délivrées par les points de mesure dans l'état non recouvert par une feuille (8) peuvent être introduites dans la première mémoire (4, 4.1) comme valeurs de référence, et en ce que les valeurs de mesure délivrées par les points de mesure dans l'état recouvert peuvent être introduites dans la seconde mémoire (5,5.1 ), en ce que les première et seconde mémoires sont associées chacune à un premier calculateur (6, 6.1), lequel détermine la différence des contenus des mémoires, et en ce que la différence des contenus des mémoires et l'allure de cette différence pour les différentes valeurs des points de mesure est prise pour base de calcul de la position d'une feuille dans un second calculateur (7).
6. Dispositif selon au moins une des revendications précédentes, caractérisé en ce qu'au moins un détecteur d'image (2.1) est réalisé sous forme d'une matrice et est fixé au support de feuille (1), de sorte que les bords latéraux et avant de feuille peuvent être explorés.
7. Dispositif selon au moins une des revendications précédentes, caractérisé en ce que la table de mesure de coordonnées (1.1) comporte un contraste, dans la zone des bords de feuille d'impression exposés, par rapport à la feuille d'impression (8), de sorte qu'un signal de sortie du densitomètre (8.1) peut être évalué, lors d'un dépassement des bords de feuille d'impression, pour la reconnaissance de position de la feuille (8).
8. Dispositif selon au moins une des revendications précédentes, caractérisé en ce qu'une distance de deux points fixes marquants de la feuille d'impression (8) est prédéfinie et stockée et peut être contrôlée par examen au moyen du densitomètre (8.1) et, lors d'un écart par contraction de la feuille d'impression (8), les valeurs de coordonnées peuvent être corrigées en proportion de l'écart.
EP83100841A 1983-01-29 1983-01-29 Dispositif pour détecter et évaluer des bandes de mesure colorimétriques sur une feuille d'impression Expired EP0114914B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP83100841A EP0114914B1 (fr) 1983-01-29 1983-01-29 Dispositif pour détecter et évaluer des bandes de mesure colorimétriques sur une feuille d'impression
AT83100841T ATE26674T1 (de) 1983-01-29 1983-01-29 Vorrichtung zum ermitteln und auswerten von farbmessfeldern auf einem druckbogen.
JP58211099A JPS59155710A (ja) 1983-01-29 1983-11-11 印刷枚葉紙のインキ測定フイ−ルドを検出しかつ評価するための装置
US06/574,875 US4648048A (en) 1983-01-29 1984-01-30 Apparatus for determining and evaluating color measurement strips on a printed sheet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP83100841A EP0114914B1 (fr) 1983-01-29 1983-01-29 Dispositif pour détecter et évaluer des bandes de mesure colorimétriques sur une feuille d'impression

Publications (2)

Publication Number Publication Date
EP0114914A1 EP0114914A1 (fr) 1984-08-08
EP0114914B1 true EP0114914B1 (fr) 1987-04-22

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ID=8190271

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EP83100841A Expired EP0114914B1 (fr) 1983-01-29 1983-01-29 Dispositif pour détecter et évaluer des bandes de mesure colorimétriques sur une feuille d'impression

Country Status (4)

Country Link
US (1) US4648048A (fr)
EP (1) EP0114914B1 (fr)
JP (1) JPS59155710A (fr)
AT (1) ATE26674T1 (fr)

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Also Published As

Publication number Publication date
ATE26674T1 (de) 1987-05-15
JPH0426044B2 (fr) 1992-05-06
US4648048A (en) 1987-03-03
JPS59155710A (ja) 1984-09-04
EP0114914A1 (fr) 1984-08-08

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