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WO1999036264A1 - Procede de correction de tons moyens - Google Patents

Procede de correction de tons moyens Download PDF

Info

Publication number
WO1999036264A1
WO1999036264A1 PCT/DE1999/000051 DE9900051W WO9936264A1 WO 1999036264 A1 WO1999036264 A1 WO 1999036264A1 DE 9900051 W DE9900051 W DE 9900051W WO 9936264 A1 WO9936264 A1 WO 9936264A1
Authority
WO
WIPO (PCT)
Prior art keywords
engraving
vibration
tone
depth
mid
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.)
Ceased
Application number
PCT/DE1999/000051
Other languages
German (de)
English (en)
Inventor
Ernst-Rudolf Gottfried Weidlich
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger 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
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of WO1999036264A1 publication Critical patent/WO1999036264A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
    • H04N1/40—Picture signal circuits
    • H04N1/407—Control or modification of tonal gradation or of extreme levels, e.g. background level
    • H04N1/4076—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture
    • H04N1/4078—Control or modification of tonal gradation or of extreme levels, e.g. background level dependent on references outside the picture using gradational references, e.g. grey-scale test pattern analysis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/045—Mechanical engraving heads

Definitions

  • an engraving element which has an engraving stylus set with a diamond as a cutting tool, moves in the axial direction along a rotating printing cylinder.
  • the engraving stylus which is controlled by a engraving control signal, cuts a sequence of cups arranged in an engraving grid into the outer surface of the printing cylinder.
  • the engraving control signal is formed by superimposing image signal values with a periodic vibration signal.
  • the image signal values represent the tonal values to be engraved between "light" (white) and "depth” (black), the tonal values in between being called midtones.
  • the vibration signal causes an oscillating stroke movement of the engraving stylus to generate the engraving grid
  • the image signal values determine the geometrical dimensions of the engraved cups, such as transverse diagonal, longitudinal diagonal, web width or puncture.
  • the engraved tonal values are determined by the volumes of the engraved wells, the volumes being able to be determined from the geometric dimensions of the wells, taking into account the cutting angle of the engraving stylus.
  • the engraving stylus wears out mechanically over time.
  • the wear takes place essentially in the cross-sectional area of the engraving stylus with which the wells of medium engraving depth are engraved in accordance with a medium tone.
  • the change in the cutting angle of the engraving stylus as a result of the mechanical wear and tear therefore leads to disturbing deviations in the geometric dimensions and thus in the cup volume, in particular when engraving midtones, from the target values required for a reproduction with correct tonal values.
  • the geometric deviations of the cells must therefore be recorded and eliminated by a so-called mid-tone correction.
  • Fig. 1 shows a basic embodiment for an electronic engraving machine for engraving printing cylinders for gravure printing.
  • the engraving machine is ® for example a HelioKlischograph from Hell Gravüre Systems GmbH,
  • the engraving element (3) is located on an engraving carriage (5), which is moved by means of a spindle (6) from an engraving carriage drive (7) in the axial direction of the printing cylinder (1).
  • the sample engraving generator (19) calls up, for example, the engraving data GD * for the target values "depth”, "light” and for at least one middle tone lying between the tonal values "light” and “depth”.
  • the called engraving data GD * are converted into the engraving control signal GS for the engraving device (3).
  • the engraving element (3) engraves at least one sample cup (30) for "light” (L), "depth” (T) and “midtone” (M) on engraving lines (29) lying next to one another.
  • several identical sample cups (30) are engraved on each engraving line (29), for example over a selectable engraving line area.
  • V cell volume
  • E vibration equivalence of a well of the tonal range "depth”
  • dLT longitudinal diagonal of a well of the tonal range "depth”
  • dQj transverse diagonal of a well of the tonal range "depth”
  • the new transverse diagonal dQ new and the new longitudinal diagonal d L new are determined from the following two relationships: Lalt - u ⁇ eu - (dQLnew; dLLnew)

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Abstract

La présente invention concerne un procédé de correction de tons moyens dans une machine à graver les rouleaux d'impression. A partir de valeurs de gravure (GD), qui représentent des valeurs de ton théoriques à obtenir par gravure, comprises entre "clair" et "foncé", et d'un signal de vibration périodique (R) servant à la production d'une trame de gravure, est produit un signal de commande de gravure (GS) destiné à un organe de gravure (3). Le burin de gravure (4) de l'organe de gravure (3) grave, dans le rouleau d'impression (1), des petits godets dont les dimensions géométriques définissent les valeurs de ton réelles gravées. Avant la gravure, les valeurs de signal de commande de gravure (GS) correspondant aux valeurs de ton théoriques "clair" et "foncé" et à au moins un "ton moyen" sont corrigées de telle sorte que les valeurs de ton réelles gravées correspondent aux valeurs de ton théoriques à graver. Pour compenser une usure du burin de gravure (4), usure qui est particulièrement visible avec les tons moyens, une correction des tons moyens est exécutée, correction au cours de laquelle le volume réduit, dû à une gravure réalisée à l'aide d'un burin de gravure (4) usé, d'un godet représentant la valeur de ton "ton moyen" est corrigé de façon à correspondre au volume de godet théorique devant être obtenu lors d'une gravure réalisée avec un burin de gravure (4) non usé.
PCT/DE1999/000051 1998-01-16 1999-01-15 Procede de correction de tons moyens Ceased WO1999036264A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1998101473 DE19801473A1 (de) 1998-01-16 1998-01-16 Verfahren zur Kalibrierung einer elektronischen Graviermaschine
DE19801473.2 1998-01-16

Publications (1)

Publication Number Publication Date
WO1999036264A1 true WO1999036264A1 (fr) 1999-07-22

Family

ID=7854812

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE1999/000051 Ceased WO1999036264A1 (fr) 1998-01-16 1999-01-15 Procede de correction de tons moyens

Country Status (2)

Country Link
DE (1) DE19801473A1 (fr)
WO (1) WO1999036264A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293426A (en) * 1990-05-25 1994-03-08 R. R. Donnelley & Sons Company Printing cylinder engraver calibration system and method
EP0595324A1 (fr) * 1992-10-28 1994-05-04 Dainippon Screen Mfg. Co., Ltd. Calibreur automatique en temps réel pour stylet électromécanique de rotogravure
US5438422A (en) * 1993-02-25 1995-08-01 Ohio Electronic Engravers, Inc. Error detection apparatus and method for use with engravers
WO1996026837A1 (fr) * 1995-02-27 1996-09-06 Ohio Electronic Engravers, Inc. Procede et appareil de gravure recourant a des corrections en mi-teinte

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5293426A (en) * 1990-05-25 1994-03-08 R. R. Donnelley & Sons Company Printing cylinder engraver calibration system and method
EP0595324A1 (fr) * 1992-10-28 1994-05-04 Dainippon Screen Mfg. Co., Ltd. Calibreur automatique en temps réel pour stylet électromécanique de rotogravure
US5438422A (en) * 1993-02-25 1995-08-01 Ohio Electronic Engravers, Inc. Error detection apparatus and method for use with engravers
WO1996026837A1 (fr) * 1995-02-27 1996-09-06 Ohio Electronic Engravers, Inc. Procede et appareil de gravure recourant a des corrections en mi-teinte

Also Published As

Publication number Publication date
DE19801473A1 (de) 1999-07-22

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