EP0031358B1 - Methode de prereglage d'une presse - Google Patents

Methode de prereglage d'une presse Download PDF

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Publication number
EP0031358B1
EP0031358B1 EP19800901371 EP80901371A EP0031358B1 EP 0031358 B1 EP0031358 B1 EP 0031358B1 EP 19800901371 EP19800901371 EP 19800901371 EP 80901371 A EP80901371 A EP 80901371A EP 0031358 B1 EP0031358 B1 EP 0031358B1
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EP
European Patent Office
Prior art keywords
data
press
objective
subjective
operator
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
EP19800901371
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German (de)
English (en)
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EP0031358A1 (fr
EP0031358A4 (fr
EP0031358B2 (fr
Inventor
Zelman Brovman Yakov
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.)
Harris Graphics Corp
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Harris Graphics Corp
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Application filed by Harris Graphics Corp filed Critical Harris Graphics Corp
Publication of EP0031358A1 publication Critical patent/EP0031358A1/fr
Publication of EP0031358A4 publication Critical patent/EP0031358A4/fr
Publication of EP0031358B1 publication Critical patent/EP0031358B1/fr
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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
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply

Definitions

  • This invention relates to a method for presetting a machine, such as a printing press, which produces multiple copies of a product which are judged as to acceptability at least in part by subjective operator evaluation.
  • This invention has application to any machine or process wherein an objective standard may be used initially in presetting the machine, and wherein the machine output can thereafter be varied or adjusted in accordance with a subjective determination by its operator.
  • a typical example is in the setting of each of the ink fountains on a printing press.
  • Each fountain is provided with a plurality of keys all of which are adjusted prior to printing to meter the amount of ink flowing onto the printing plate.
  • the pressman will first scan visually the printing plate and estimate the amount of ink needed within each of the sections controlled by the keys of the ink fountain.
  • an optical scanner is used to scan a printing plate to determine the amount of ink needed within certain narrow sections of the printing plate, and that information is then processed to set automatically the corresponding keys of each fountain.
  • electromechanical means for setting the keys from a remote location, and also transducers for indicating each key position at a remote location, for example, on a television screen.
  • means may be provided to record the information from the optical scanner regarding the percentage of coverage on the printing plate for each key position. Key position and other press information deemed by the pressman to represent the best printing quality is recorded so that if the printing run were interrupted, for whatever reason, that information could then be recalled and used to preset the machine when printing is resumed using those same plates.
  • the keys of the fountain were preset either according to the judgment of the pressman or by automatic means as described above. Once these initial adjustments were made, the press was then started, and further adjustments made to the fountains, and other systems, such as to compensate for registration of various colors, water fountains, etc., to improve the quality of the output until it achieved accceptable quality, known as "save” quality. As the press continued to run, still further fine adjustments were made by the pressman until, usually after several hours of running, a quality of printing of high grade results, known as "OK" quality. It is the "OK" quality settings that are recorded for later use should the printing operation be interrupted, for example by a priority printing job, during the middle of a run.
  • the invention provides a method of automatic control of a printing press comprising the steps of
  • the invention also provides a method of automatic control of a process for producing multiple copies of a product which is judged as to acceptability at least in part by subjective operator evaluation, and in which the operator can control at least some of the functions of the process, the method comprising the steps of
  • information from a plurality of previously completed jobs including data obtained from an objective source and data obtained from a subjective source, are analyzed and compared to provide parameters which thereafter are used in setting machine functions in response to subsequently obtained objective data.
  • the objective data such as the amount of coverage as determined by the optical scanner
  • the elements to be controlled such as keys
  • a Fourier analysis is made to derive amplitude information for a plurality of harmonics sufficient to represent accurately the relationship between the objective data and the element to be controlled.
  • the subjective data such as setting as determined by the pressman for the "OK" condition
  • each of the machine elements to be controlled such as keys
  • This analysis is accomplished for a number of previous jobs on a particular machine, preferably with the same operator, sufficiently large that the information derived from this analysis is statistically valid.
  • the average or zero harmonic is taken, and the sine and cosine functions of the first, second, third and fourth harmonics analyzed.
  • a typical press 10 includes a supply cabinet 12, press stations 14, 16, 18 and 20, and a dryer section 22. While a multiple section printing press is illustrated, it is to be understood that this invention is applicable to other types of machines wherein objectively obtained data may be processed and thereafter modified by the machine operator to produce a result which is pleasing to the eye. It is also understood that the press shown in Fig. 1 contains multiple sections, and that each of the sections can be independently controlled or modified in accordance with the invention hereinafter described.
  • Fig. 2 represents a control console 30 having a viewing screen 32 and a control panel 34.
  • the position of the actuator keys on each of qhe fountain rolls of the press 10, for example, may be displayed visually on the screen 32, and those actuator positions varied according to the pressman's instructions by manipulation of the controls 34.
  • Fig. 3 shows a typical ink distribution system 40 wherein ink is placed in a trough 42 formed between fountain roll 44 and the foun-tain blade 46.
  • a plurality of keys 48 control the gap 4-8 between the blade 46 and the roll 44.
  • the setting of the keys 48 is determined by actuators 50.
  • the press 10 has twelve fountains each including twenty-four keys.
  • a ductor roll 52 transfers the ink from the fountain roll 44 to an ink train including rolls 54 ⁇ 64 to the plate cylinder 64.
  • Rolls 54, 56, 57, 59, 60 and 61 are distributor rolls; rolls 55, 58 and 62 are vibrator rolls; and rolls 63 and 64 are form rolls.
  • the gap 49 between the blade 46 and the fountain roll 44 is determined by the setting of key 48.
  • eight such keys are illustrated, with each key setting being determined by an actuator 50.
  • the actuators may be controlled remotely from the console 30.
  • Each actuator preferably includes a potentiometer or some other readout device so that the setting of the key 48 can be determined remotely, displayed on the screen 32 and recorded in a memory.
  • the key setting information, and therefore the gap between the blade 46 and the roll 44 is also used for other purposes, as will be explained.
  • the keys 48 are adjusted to place the blade 46 adjacent the roll 44. In a typical press, a three mil spacing will permit sufficient ink to be transmitted to provide for a fifteen percent ink coverage.
  • a light table 70 is a conventional device which is provided with a plurality of photosensitive elements for scanning the copy to be printed to determine the percentage of ink coverage in those areas corresponding to the areas controlled by the corresponding fountain keys.
  • This data is an objective determination of the amount of ink needed for each key location across the plate cylinder and may be directed through the control console 30 to the press 10 and stored in a memory 75 and thereafter used in the manner hereinafter to be described.
  • an operator or pressman 80 visually observes the output of copy 85 from the machine or press 10 and judges the acceptability or quality of that output and then makes adjustments to the machine process, such as the setting of the fountain key, until the quality of the output is deemed satisfactory.
  • the amount as well as the distribution of the ink may be varied in small increments over a relatively long period of time before the highest quality output has been obtained.
  • the adjustable machine settings are then recorded in a memory 90. That information will then be recalled and used to preset the machine at a later time should the printing run be interrupted for any reason.
  • Fig. 7 shows the relationship between the fountain keys and the percentage of ink coverage for a particular printing operation. This represents objective data obtained by a properly calibrated optical instrument and is the information recorded in the memory 75 after the copy is scanned at the light table 70.
  • Fig. 8 shows the relationship between the fountain keys and the setting of those keys, or the gap between the fountain blade and the fountain roll.
  • the resulting curve is smoothed, because of the characteristics of the vibrator and the usual practice of the press operator.
  • Both of the curves represented by Figs. 7 and 8 are subjected to Fourier analysis. Since a typical press, and the one described herein, includes twenty-four key positions, twelve harmonics values may be analyzed; however, experience has shown that only the average and the first four harmonics need be analyzed to provide accurate key presetting instructions. A harmonic analysis has been found to approximate more closely the actions of the machine operator than a linear polynominal, or other type of analysis of the same information.
  • the first harmonic value appears to represent skewness, or the variations in spacing from one end of the rolls to the other within the ink train; the second harmonic appears to be a result of the pressman's personality, most of whom will close or substantially close the end keys; and other harmonics appear to be related to the state of the inker system-for example, irregularities in the rolls of the inking system of Fig. 3, such as humps and bumps.
  • the information stored in memories 75 and 90 for each of the fountains in a press (a typical press, and the one described hereinafter includes twelve fountains) for a plurality of printing jobs is correlated and the information obtained therefrom later used to preset the keys.
  • the quality of printing resulting from the press in ninety percent of the cases will be at least in the "save" category.
  • the number of jobs analyzed must be sufficiently large to provide a statistically accurate sample of the characteristics of the machine or press and represent the personality or characteristics and habits of the machine operator. It has been found that eight to ten press runs will provide sufficiently accurate information to preset the fountain keys as described.
  • the zero harmonic for each of ten jobs will be plotted on the same way, resulting in the plurality of dots shown in Fig. 9.
  • a line is drawn through these dots as determined by the least squares fit procedure, and this line therefore represents the correlation between the average or zero harmonic analysis of Fig. 7.
  • each of the remaining harmonic values for both the objective data of Fig. 7 and the subjective data of Fig. 8 are compared and a relationship established so that subsequent objective data can be converted into key preset instructions. Therefore, when new objective data (percentage coverage) information is obtained from the light table, that may be analyzed by breaking it down into its harmonic components, and by reference to the set of parameters m and b as represented by Fig. 9, the key set position is obtained by summing the predicted key position values obtained from each harmonic component.
  • the first, C1 analyzes the information recorded in the press from the prior ten jobs and uses that information to generate the parameters utilized by the second program, C2, which provides instructions for presetting the keys of the fountain in response to the information obtained from optically scanning a printing plate.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

Une methode de commande automatique d'une presse a imprimer (10) comprend les etapes d'exploration d'une representation d'une image a imprimer au moyen d'une table lumineuse (70) pour en deriver les donnees objectives representant la densite moyenne de l'image encree dans des regions correspondantes a celles commandees par des cles (48) d'une source d'encre, produisant des copies imprimees multiples (85) de l'image suite a l'intervention subjective de l'operateur (80) dans le reglage des cles de la source, d'enregistrement des donnees objectives en memoire (75) et d'enregistrement des donnees subjectives representant le reglage des cles de la source reglees par l'operateur dans la memoire (90) pour plusieurs tirages differents, l'analyse des donnees objectives et des donnees de reglage des cles en examinant une pluralite de leurs composantes harmoniques suffisamment grandes pour representer de maniere precise ces donnees par un circuit (100), la correlation par une analyse de regression lineaire des composantes harmoniques respectives des donnees objectives et des donnees subjectives pendant plusieurs de ces tirages et le stockage de ces parametres de regression lineaire, puis l'exploration d'une representation d'une nouvelle image a imprimer par la table lumineuse (70) pour en deriver les donnees objectives, l'analyse des nouvelles donnees objectives en examinant leurs composantes harmoniques dans le circuit (100) et en appliquant les donnees parametriques de regression pour chacune des valeurs harmoniques trouvees precedemment, et en deriver les instructions de reglage des cles pour preregler la presse (10).

Claims (2)

1. Procédé pour la commande automatique d'une presse d'imprimerie comprenant les phases consistant à explorer par balayage une maquette d'une image destinée à être imprimée pour établir des données objectives représentant la densité moyenne d'encre de l'image dans les parties correspondant à celles contrôlées par les cales d'un bac encreur, à produire plusieurs copies imprimées de l'image résultant d'une intervention subjective du conducteur de machine dans le réglage des câles du bac encreur, à mettre en mémoire les données objectives et les données subjectives représentant les réglages des cales effectués par le conducteur de machine pour plusieurs passages différents, à analyser les données objectives et les données de réglage des cales en examinant plusieurs composants harmoniques de ces données suffisamment larges pour représenter correctement ces données, à mettre en corrélation par une analyse de rebroussement linéaire, les composants harmoniques respectifs des données objectives et des données subjectives pour plusieurs passages sur la presse et à mettre en mémoire lesdits paramètres de rebroussement linéraire, à explorer ensuite par balayage une nouvelle image à imprimer pour établir des données objectives concernant cette image, à analyser les nouvelles données objectives en examinant leurs composants harmoniques et à établir les valeurs de réglage des cales pour un pré-réglage de la presse en appliquant les paramètres de rebroussement des valeurs harmoniques établies antérieurement.
2. Procédé pour la commande automatique d'un processus pour la fabrication de plusieurs copies d'un produit considéré au moins partiellement acceptable par l'évaluation subjective du conducteur de machine; processus dans lequel le conducteur peut contrôler au moins certaines fonctions les procédé comprenant les phases consistant:
a) à appliquer des données de démarrage objectives représentant des signaux de commande possibles établis empiriquement et succep-tibles de produire un produit acceptable,
b) à ajuster les signaux de commande à la suite de l'inspection par le conducteur de machine d'un nombre limité de produits,
c) à mettre en mémoire les signaux de commande objectifs et les signaux de commande subjectifs ajustés,
d) à répéter les phases b et c un nombre de fois suffisant pour établir une base de données pour un contrôle ultérieur du processus de production.
e) à établir la moyenne des signaux de commande mis en mémoire pour établir des informations de commande utilisables et,
f) à exécuter le processus de production en utilisant les informations de commande utilisables comme signaux de commande de base de sortie que les signaux de commande automatique sont basés sur le jugement antérieur du conducteur de machine sur un produit considéré acceptable.
EP19800901371 1979-06-25 1981-01-12 Methode de prereglage d'une presse Expired EP0031358B2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5193079A 1979-06-25 1979-06-25
US51930 1993-04-26

Publications (4)

Publication Number Publication Date
EP0031358A1 EP0031358A1 (fr) 1981-07-08
EP0031358A4 EP0031358A4 (fr) 1981-11-24
EP0031358B1 true EP0031358B1 (fr) 1984-09-26
EP0031358B2 EP0031358B2 (fr) 1990-08-01

Family

ID=21974284

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800901371 Expired EP0031358B2 (fr) 1979-06-25 1981-01-12 Methode de prereglage d'une presse

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EP (1) EP0031358B2 (fr)
DE (1) DE3069280D1 (fr)
WO (1) WO1981000007A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3620152A1 (de) * 1985-06-25 1987-01-08 Polygraph Leipzig Anpassungseinrichtung fuer ein druckmaschinen-farbwerkfernverstellsystem
US7059245B2 (en) 2002-04-03 2006-06-13 Heidelberger Druckmaschinen Ag Method of controlling printing presses

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU3554495A (en) 1994-09-19 1996-04-09 Apple Computer, Inc. Generation of tone reproduction curves using psychophysical data
DE10103039B4 (de) * 2001-01-24 2015-07-02 Heidelberger Druckmaschinen Ag Verfahren zur Einstellung drucktechnischer und anderer jobabhängiger Parameter einer Druckmaschine
DE102009033905A1 (de) 2008-08-22 2010-02-25 Heidelberger Druckmaschinen Ag Farbwerks- und Feuchtwerksanalyse

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3958509A (en) * 1974-06-13 1976-05-25 Harris Corporation Image scan and ink control system
US3930447A (en) * 1974-07-22 1976-01-06 Harris Corporation Dual purpose display for printing presses

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3620152A1 (de) * 1985-06-25 1987-01-08 Polygraph Leipzig Anpassungseinrichtung fuer ein druckmaschinen-farbwerkfernverstellsystem
US7059245B2 (en) 2002-04-03 2006-06-13 Heidelberger Druckmaschinen Ag Method of controlling printing presses

Also Published As

Publication number Publication date
EP0031358A1 (fr) 1981-07-08
EP0031358A4 (fr) 1981-11-24
EP0031358B2 (fr) 1990-08-01
DE3069280D1 (en) 1984-10-31
WO1981000007A1 (fr) 1981-01-08

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