EP0149424B1 - Verfahren, Vorrichtung und Farbmessstreifen für die Druckqualitätsbeurteilung - Google Patents

Verfahren, Vorrichtung und Farbmessstreifen für die Druckqualitätsbeurteilung Download PDF

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Publication number
EP0149424B1
EP0149424B1 EP84810613A EP84810613A EP0149424B1 EP 0149424 B1 EP0149424 B1 EP 0149424B1 EP 84810613 A EP84810613 A EP 84810613A EP 84810613 A EP84810613 A EP 84810613A EP 0149424 B1 EP0149424 B1 EP 0149424B1
Authority
EP
European Patent Office
Prior art keywords
measuring
information
code
colour
reading
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 - Lifetime
Application number
EP84810613A
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German (de)
English (en)
French (fr)
Other versions
EP0149424A2 (de
EP0149424A3 (en
Inventor
Hans Ott
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.)
Gretag AG
Original Assignee
Gretag 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
Application filed by Gretag AG filed Critical Gretag AG
Priority to AT84810613T priority Critical patent/ATE58336T1/de
Publication of EP0149424A2 publication Critical patent/EP0149424A2/de
Publication of EP0149424A3 publication Critical patent/EP0149424A3/de
Application granted granted Critical
Publication of EP0149424B1 publication Critical patent/EP0149424B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 strips 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 sampling densitometers include: in EP-A-0064024, US-A-3 995 958 and EP-A-011376, examples of machine densitometers can be found, inter alia, in in U.S. Patent Nos. 3,376,426 and 3,390,447.
  • 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 marginal 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 described and the scanning head for the measuring fields, which is in a fixed spatial association with the measuring fields, 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. Three such reading tracks are indicated in the drawing, for example 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 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 In principle the same as that of FIG. 1, but in the example shown some codes have a fixed code element 3 and a variable code element 10 more.
  • 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 EP-A-0064024, but differs essentially only in an additional reading head for the information code and a corresponding interface for connecting the reading head to the electronic system implemented by a computer Control of the movement and measurement functions and for processing the read data.
  • a carriage 20 is arranged on a bridge, not shown, to be guided 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.
  • Fifth light sources 221 and a corresponding number of light receivers 222 and generates fifth 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.
  • 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 EP-A-0064024 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 several parallel tracks makes it possible to keep the information codes IC relatively narrow (-1 mm), since the code in at least one of the scanning tracks will always be read without errors.
  • the information from the individual reading tracks is analyzed in the electronic system and the track position and the exact position in the Y direction are determined from this.
  • 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, i.e. it is printed in the same way as the color measuring fields.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Spectrometry And Color Measurement (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Color Image Communication Systems (AREA)
EP84810613A 1983-12-19 1984-12-13 Verfahren, Vorrichtung und Farbmessstreifen für die Druckqualitätsbeurteilung Expired - Lifetime EP0149424B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84810613T ATE58336T1 (de) 1983-12-19 1984-12-13 Verfahren, vorrichtung und farbmessstreifen fuer die druckqualitaetsbeurteilung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH6748/83 1983-12-19
CH674883 1983-12-19

Publications (3)

Publication Number Publication Date
EP0149424A2 EP0149424A2 (de) 1985-07-24
EP0149424A3 EP0149424A3 (en) 1988-09-21
EP0149424B1 true EP0149424B1 (de) 1990-11-14

Family

ID=4314410

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84810613A Expired - Lifetime EP0149424B1 (de) 1983-12-19 1984-12-13 Verfahren, Vorrichtung und Farbmessstreifen für die Druckqualitätsbeurteilung

Country Status (11)

Country Link
US (1) US4671661A (enrdf_load_stackoverflow)
EP (1) EP0149424B1 (enrdf_load_stackoverflow)
JP (1) JPS60190822A (enrdf_load_stackoverflow)
AT (1) ATE58336T1 (enrdf_load_stackoverflow)
AU (2) AU569356B2 (enrdf_load_stackoverflow)
CA (1) CA1217275A (enrdf_load_stackoverflow)
DE (1) DE3483606D1 (enrdf_load_stackoverflow)
DK (1) DK162662C (enrdf_load_stackoverflow)
ES (1) ES8608157A1 (enrdf_load_stackoverflow)
NO (1) NO168272C (enrdf_load_stackoverflow)
ZA (1) ZA849839B (enrdf_load_stackoverflow)

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GB8524483D0 (en) * 1985-10-04 1985-11-06 Foilwraps Ltd Gravure printing
US5182721A (en) * 1985-12-10 1993-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Process and apparatus for controlling the inking process in a printing machine
DE3614092A1 (de) * 1986-04-25 1987-10-29 Grapho Metronic Gmbh & Co Verfahren und anordnung zum ausmessen von auf druckerzeugnissen mitgedruckten farbmessstreifen
DE3631204C2 (de) * 1986-09-13 1993-11-25 Roland Man Druckmasch Vorrichtung an Druckmaschinen zur densitometrischen Erfassung eines Meßfeldstreifens
US4767933A (en) * 1987-07-21 1988-08-30 Storage Technology Corporation Optical ribbon edge sensor having means for adjusting the switch sensitivity to the selected ink color
DE3738850A1 (de) * 1987-11-16 1989-05-24 Roland Man Druckmasch Verfahren zur automatischen positionsfindung von druckkontrollstreifen fuer automatisch messende farbdichtemessanlagen
US4967379A (en) * 1987-12-16 1990-10-30 Gretag Aktiengesellschaft Process for the ink control or regulation of a printing machine by comparing desired color to obtainable color data
US4975862A (en) * 1988-01-14 1990-12-04 Gretag Aktiengesellschaft Process and apparatus for the ink control of a printing machine
DE3830731A1 (de) * 1988-09-09 1990-03-22 Heidelberger Druckmasch Ag Vorrichtung zur farbmessung
DE3830732C2 (de) * 1988-09-09 2000-05-25 Heidelberger Druckmasch Ag Verfahren zur Feuchtmittelführung bei einer Offset-Druckmaschine
US5118183A (en) * 1989-02-10 1992-06-02 X-Rite, Incorporated Automated strip reader densitometer
CA2009614C (en) * 1989-02-10 1999-09-21 X-Rite, Inc. Automated strip reader densitometer
DE3942254A1 (de) * 1989-12-21 1991-07-04 Krzyminski Harald Druckkontrollstreifen
US5062714A (en) * 1990-02-12 1991-11-05 X-Rite, Incorporated Apparatus and method for pattern recognition
US5194720A (en) * 1991-04-25 1993-03-16 Eastman Kodak Company Method and apparatus for performing on-line integrated decoding and evaluation of bar code data
US5229588A (en) * 1991-09-30 1993-07-20 Ncr Corporation Dual aperture optical scanner
US5442188A (en) * 1992-04-22 1995-08-15 Gould Instruments Systems, Inc. Strip chart recorder paper attribute detector and monitor
US6351263B1 (en) 1992-07-28 2002-02-26 Canon Kabushiki Kaisha Image processor which manually and independently designates processing parameters for character data and image data
DE69321174T2 (de) * 1992-07-28 1999-03-18 Canon K.K., Tokio/Tokyo Bildverarbeitungsvorrichtung
DE4431270C2 (de) * 1993-10-21 1997-01-16 Roland Man Druckmasch Verfahren zur Steuerung der Farbführung einer autotypisch arbeitenden Druckmaschine
DE4435893C1 (de) * 1994-10-07 1996-03-07 Techkon Elektronik Gmbh Handmeßgerät für densitometrische und farbmetrische Reflexionsmessungen
US5774225A (en) 1996-03-27 1998-06-30 Advanced Vision Technology, Ltd. System and method for color measurement and control on-press during printing
US5731989A (en) * 1996-04-25 1998-03-24 Advance Vision Technology (A.V.T.) Ltd. Method and device for determining a measurement for color control in a printing process
GB2326615A (en) * 1997-06-27 1998-12-30 Tecscan Electronics Limited Print monitoring
JP2003521701A (ja) 2000-02-04 2003-07-15 エックス−ライト、インコーポレイテッド 色測定器
DE10023128A1 (de) * 2000-05-11 2001-11-15 Roland Man Druckmasch Abtastverfahren und Abtastvorrichtung zur optischen Dichtemessung
GB2362711B (en) 2000-05-25 2004-09-08 Spectral Fusion Technologies L Analysis of samples
GB2362710B (en) * 2000-05-25 2002-07-17 Intelligent Mfg Systems Ltd Analysis of samples
US20050068520A1 (en) * 2001-02-02 2005-03-31 Beimers Daniel J. Handheld color measurement instrument
EP1279502B1 (de) * 2001-07-12 2007-08-15 Alcan Technology & Management AG Verfahren zur Kontrolle eines Tiefdruckverfahrens
US6814844B2 (en) * 2001-08-29 2004-11-09 Roche Diagnostics Corporation Biosensor with code pattern
US7248284B2 (en) * 2002-08-12 2007-07-24 Edward Alan Pierce Calibration targets for digital cameras and methods of using same
US7466416B2 (en) * 2004-04-30 2008-12-16 X-Rite, Inc. Color measurement system
US7077064B1 (en) * 2005-04-19 2006-07-18 Sun Chemical Corporation Methods for measurement and control of ink concentration and film thickness
JP2008085845A (ja) * 2006-09-28 2008-04-10 Brother Ind Ltd 画像形成システム
EP2719157B1 (en) 2011-06-08 2016-04-13 Hewlett-Packard Indigo B.V. System and method for position calibration of a spot of an optical sensor
US9336465B2 (en) 2013-03-15 2016-05-10 Electronics For Imaging, Inc. Method and apparatus for color print management
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Also Published As

Publication number Publication date
DK162662B (da) 1991-11-25
DK605984D0 (da) 1984-12-18
NO168272B (no) 1991-10-21
NO845092L (no) 1985-06-20
ZA849839B (en) 1985-08-28
AU8182887A (en) 1988-03-24
CA1217275A (en) 1987-01-27
ES8608157A1 (es) 1986-06-16
ES538705A0 (es) 1986-06-16
JPS60190822A (ja) 1985-09-28
EP0149424A2 (de) 1985-07-24
NO168272C (no) 1992-01-29
DK605984A (da) 1985-06-20
AU3689884A (en) 1985-07-04
JPH0513245B2 (enrdf_load_stackoverflow) 1993-02-22
US4671661A (en) 1987-06-09
ATE58336T1 (de) 1990-11-15
DK162662C (da) 1992-04-06
DE3483606D1 (de) 1990-12-20
AU605208B2 (en) 1991-01-10
EP0149424A3 (en) 1988-09-21
AU569356B2 (en) 1988-01-28

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