EP0123257A2 - Procédé et dispositif de réglage de l'alimentation en encre des encriers d'une machine à imprimer en plusieurs couleurs - Google Patents

Procédé et dispositif de réglage de l'alimentation en encre des encriers d'une machine à imprimer en plusieurs couleurs Download PDF

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Publication number
EP0123257A2
EP0123257A2 EP84104326A EP84104326A EP0123257A2 EP 0123257 A2 EP0123257 A2 EP 0123257A2 EP 84104326 A EP84104326 A EP 84104326A EP 84104326 A EP84104326 A EP 84104326A EP 0123257 A2 EP0123257 A2 EP 0123257A2
Authority
EP
European Patent Office
Prior art keywords
light
zone
frequency
intensity
assigned
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
EP84104326A
Other languages
German (de)
English (en)
Other versions
EP0123257A3 (fr
Inventor
Joachim Bernauer
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.)
Albert Frankenthal AG
Original Assignee
Albert Frankenthal 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 Albert Frankenthal AG filed Critical Albert Frankenthal AG
Publication of EP0123257A2 publication Critical patent/EP0123257A2/fr
Publication of EP0123257A3 publication Critical patent/EP0123257A3/fr
Ceased 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
    • 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 method for regulating the zone-by-zone ink supply fed from a color memory to the inking units of a multicolor printing machine, in particular for regulating the position of zone screws influencing the ink supply, and according to a further inventive concept to an apparatus for carrying out this method.
  • test strips have been printed on the edge of the actual print image Use. These test strips consist of solid color fields provided for each inking unit zone and assigned to the primary colors used. These spot fields are recorded densitometrically and compared with a target value to determine whether there is a lack of color or excess color.
  • the disadvantage here is that a certain area must be reserved for the test strips on the substrate per cylinder circumference. This not only means a loss of available usable space, but also requires a great deal of effort to subsequently remove the test strips mentioned when further processing a printed web into sheet-like products.
  • Another disadvantage is the only very rough resolution of the color spectrum, which is far from the function of the human eye. The color spectrum is practically broken down into just three fields corresponding to the primary colors.
  • the colors used may contain a certain proportion of another color.
  • the blue may have a slight red cast or the like.
  • this cannot be determined in the case of the rough resolution of the color spectrum mentioned. The consequence of this can therefore be that if blue and red are overprinted, the red component is obviously too large for the eye and the blue component becomes too small, even though the full-tone areas of the test strips correspond to the desired value.
  • the print quality that can be achieved is therefore not quite up to high demands.
  • the solution of the parent object is achieved in a surprisingly simple manner by the corresponding the extracted from one of the current production submission of at least one inking zone corresponding width remitted light optical frequencies are reacted q Uenzen in acoustic frequency and spectrally detected by intensity and that the resultant intensity values are set in relation to the colors used for producing the multicolor print and regulating variables are implemented in the supply of the colors used.
  • the device according to the invention for solving the object on the device side is characterized by at least one light pressure transducer which can be acted upon by a light which can be exposed to light at least in zones, the output signals of which can be recorded by means of an acoustic sensor and transmitted to an acoustic receiver, one of which assigns the assigned spectrum to any one
  • a number of frequency filter devices dividing frequency ranges is arranged, whose output values assigned to the individual frequency ranges can be implemented zone by zone by means of a downstream evaluation device in the manipulated variables assigned to the colors used for producing the multicolor print.
  • the conversion of the optical frequencies of the colored light remitted from the original into acoustic frequencies advantageously enables frequency filtering without loss of intensity.
  • the entire intensity of the circularly polarized light is therefore included in the result.
  • Polarization of the light and associated intensity losses are advantageously not required here.
  • This therefore gives measured values with a high intensity level.
  • the influence of disturbance variables on the measured values obtained is therefore advantageously small.
  • the conversion of the optical frequencies into acoustic frequencies enables the use of acoustic sensors which are advantageously not only extremely robust, but also have a uniform sensitivity over the entire spectrum.
  • Another advantage of the measures according to the invention can be seen in the fact that no mechanical movement of parts of the optics or no geometric representation of the template are required here.
  • the light pressure converter used can process a luminous flux of any shape, which has a positive effect on the construction of the required optics.
  • a very particular advantage of the measures according to the invention can be seen in the fact that a high selective sensitivity can be achieved, ie. that the division of the spectrum on the acoustic side can advantageously be carried out in such a fine manner that a resolution of the recorded frequency band covering the entire optical spectrum that is appropriate for the resolution of the human eye is achieved.
  • the measures according to the invention practically provide an intensity which corresponds very precisely to the actual color of the original tity curve across the entire spectrum, which also allows the semitones etc. which are spectrally located in the transition regions to be detected without further ado and assigned to the spectral range of the colors used.
  • the fine screening advantageously also enables the use of colors which deviate from the standard colors in the tinting without this having a negative effect on the result, which increases the versatility of a printing press with regard to the colors to be used.
  • the cited light pressure converter is a known component for converting a light signal into a corresponding acoustic signal.
  • arrangements of this type have so far only been used to determine the type of composition of a liquid or a gas.
  • a light pressure converter containing the medium to be determined is acted upon by monochromatic light.
  • the acoustic signal that can be recorded by means of an acoustic sensor can be set in relation to the material properties of the medium. From this, however, no reference to the combination according to the invention could be seen.
  • acousto-optical filters are excited by means of a vibration generator and only allow a certain frequency range dependent on the excitation to pass through.
  • Devices of this type have so far been used for polarizing light in light guide systems.
  • polarization of the light is clearly required here.
  • the achievable measured values are therefore at a very low level, so that disturbances can have a noticeable influence. Accordingly, no suggestion for solving the object according to the invention could be derived from this either.
  • the light pressure converter is advantageously subjected to light chopped according to its natural frequency. This measure advantageously results in self-reinforcement.
  • the intensity values remitted from an existing template can be compared with the intensity values resulting in full light and the intensity difference values can be converted into corresponding manipulated variables, preferably after comparison with corresponding target values.
  • Another expedient measure can consist in the fact that the running printing material web is used as a template in a web-fed rotary printing press, whereby the light remitted therefrom is integrated over a predetermined distance, preferably corresponding to a cylinder circumference.
  • This measure allows advantageously an ongoing surveil - monitoring the coloring based on the moving paper web and therefore represents advantageously a very short-term intervention option available.
  • the frequency intensity can be determined within the range of 10 to 20, preferably 15, frequency ranges of the same width.
  • Such frequency ranges can advantageously be filtered out on the acoustic side without loss of intensity from the frequency band received by means of a so-called panorama receiver.
  • the individual frequency ranges are expediently filtered out of the recorded frequency band one after the other.
  • a so-called panorama receiver can be followed by a frequency filter that can be set and queried by a computer for each frequency range. This measure ensures that you can practically get by with a Freauenzfilter that is set and queried accordingly, which greatly simplifies the calibration.
  • the light pressure converter (s) can each be formed by a glass body. This measure advantageously results in a high level of accuracy and nevertheless proves to be extremely simple and inexpensive.
  • a multicolor printing press for example in the form of a high-pressure or, in particular, an offset roll rotary printing press
  • FIG. 1 the printing material printed multicolored in such a web-fed rotary printing press is only indicated schematically on the basis of a paper web 1.
  • the print quality here depends in particular on the correct coloring of the shape. Both excess color and lack of color can be harmful. However, since the required color density differs across the machine width, it is known that it is divided into several zones, each of which is assigned a zone screw that determines the ink supply.
  • the setting of the zone screws is set as a function of measured values taken directly from the respective zones of the print image present on the paper web 1, so that a number of controlled systems corresponding to the number of zones present is obtained results in compliance with the desired coloring.
  • the measured values to be recorded here consist of colored light remitted by a template containing the printed image and generated by means of a light source 2.
  • the template can be a sheet taken from the current production.
  • the printed material web or respectively a web section corresponding to a forme cylinder circumference.
  • a light source 2 is provided per zone, through which light is applied to the original.
  • light with a known spectrum is used to achieve an exact evaluation.
  • light with the spectrum corresponding to daylight has proven to be expedient.
  • Daylight lamps with an output of 4000 to 5000 Kelvin have proven to be expedient as the light source 2 for generating appropriately amplified daylight.
  • the light sources 2 respectively assigned to the adjacent zones of the paper web 1 are expediently arranged in the region before the paper web 1 enters a folding device arranged downstream of the printing press.
  • the arrangement can be offset relative to one another in the direction of the running direction of the web so that there is no fear of mutual interference if all light sources are activated at the same time. However, this can also be achieved in an advantageous manner by activating the light sources 2 in a correspondingly graduated manner.
  • the light cast by each light source 2 onto the respectively assigned zone of the paper web 1 is, as indicated by the beam path 3, remitted by the paper web 1.
  • the remitted light is fed to a light pressure converter 4.
  • This is a device that contains an anisotropic medium, i.e. a medium that reacts to light printing in such a way that a known response in the form of a frequency in the range of the acoustic spectrum is assigned to each frequency in the range of the visible spectrum.
  • This can be a chamber filled with a gas or a liquid.
  • a glass body 5 with a crystalline structure is used as the anisotropic medium.
  • the glass is doped with foreign atoms so that the same light pressure is achieved across the entire spectrum.
  • the glass body 5 is accommodated in a housing 6 which is open on the light input side.
  • a housing 6 which is open on the light input side.
  • light chopped according to the natural frequency of the respectively assigned light pressure transducer 4 so that corresponding resonance phenomena result.
  • each zone of the paper web 1 is assigned a light source 2, each with a downstream light pressure converter 6.
  • These units can therefore be arranged stationary.
  • the output signals of the light pressure transducers 4 present here in a number corresponding to the number of zones are combined with an associated acoustic signal Sensor 7, in the form of a microphone attached to the respectively assigned light pressure transducer 4, is recorded and fed via it to an acoustic receiver 8 in the form of a so-called panorama receiver, which can receive all frequencies over the entire spectrum.
  • the receiver 8 assigned to each zone here thus receives an acoustic spectrum which corresponds to the optical spectrum of the light supplied to the respectively assigned light pressure converter 4.
  • the intensity of the received acoustic frequencies is thus an exact measure for the intensity of the optical frequencies of the remitted light and thus for the intensity of the coloring of the printed image contained on the scanned paper web 1.
  • the acoustic frequencies recorded by the receivers 8 per zone are recorded spectrally according to intensity. To this end, the entire range is q in an arbitrarily large number of adjacent, non-overlapping end Fre divided rich uenzbe-. A division into 10 to 20, preferably 16, frequency ranges of equal width has proven to be expedient. These areas are filtered out of the spectrum received by the receivers 8.
  • a frequency filter device 9 is arranged downstream of the receivers 8. This can consist of a number of individual frequency filters corresponding to the number of desired ranges, each of which is assigned to a frequency range. In the exemplary embodiment shown, only one frequency filter is provided to form the frequency filter device 9, which can be adjusted to the desired frequency ranges, which facilitates the calibration.
  • the frequency filters 9 are controlled by means of a central computer 10, which polls all frequency ranges of the respectively connected frequency filter 9 one after the other.
  • the query time is very short, so that the results assigned to each zone are available practically simultaneously.
  • the computer 10 can normally query the frequency filters 9 assigned to all zones at the same time. For this purpose, the computer 10 is provided with a corresponding number of inputs 11.
  • the frequency filters 9 are controlled via the control line 19.
  • the computer 10 determines from the intensity values queried for each zone, each assigned to a frequency range, an intensity curve 12 that extends across the entire spectrum, which may have the course indicated by dash-dotted lines in FIG. 2 and that is used to create corresponding zone screw manipulated variables in relation to the the spectral ranges assigned to the primary colors yellow, red, blue can be set, so that actuating signals assigned to the zone screws of the successive inking units can be determined therefrom.
  • Each basic color can be represented in the coordinate system according to FIG. 2 as a parabolic intensity curve 13 drawn as a solid line in FIG. 2, mutual intersections being present in the edge regions, so that a division of the entire spectrum according to such a three-part grid should lead to inaccuracies.
  • the entire spectrum is therefore subdivided into several, preferably 15 narrow, non-overlapping frequency ranges 14, which accordingly results in a very fine resolution and enables good assignment even in the intersection areas of the three-part color grid.
  • the determination of the manipulated variables assigned to the individual colors can be carried out simply in such a way that the areas delimited by curve 12 are in each color intensity 13 lying frequency ranges 14 are integrated over the individual color intensity curves 13 and that the resulting values are compared with the area of the respectively associated color intensity curve 13.
  • the manipulated variable is formed from the resulting difference. Because of the fine division of the entire frequency band, a simple assignment of the areas 14 to one or the other color is possible here in the intersection areas of the color intensity curves 13.
  • the central computer 10 practically forms a central evaluation device through which all zone screws 15 of all inking units can be operated.
  • the zone screws 15 assigned to the same zone in each case in the area of the inking units assigned to the printing units arranged one behind the other here each form a zone screw group 16, to which a light pressure converter 4 with an upstream light source 2 and a downstream receiver 8 is assigned, which enables simultaneous data recording and data processing.
  • a corresponding receiving device which is moved from zone to zone.
  • Each zone screw 15 is assigned a servomotor 17 which can be controlled by the computer 10.
  • the computer 10 is provided with a corresponding number of outputs.
  • the light sources 2 assigned to the individual zones are controlled by the computer 10 by means of a signal line 18 so that the paper web 1 is only in each case during the passage of a distance or a cylinder circumference a whole multiple of it is flashed at.
  • chopped light corresponding to the natural frequency of the respective light pressure transducer 4 which allows a desired amplification to be expected and at the same time enables simple integration of the light values resulting over the detected web section.
  • Corresponding control lines 19 are provided for controlling the interrogation frequency filter 9 by means of the central computer 10.
  • the actuating variables which can be set with the aid of the servomotors 17 are determined by comparing the measured values with those stored in the computer 10, by evaluating an ideal template, e.g. B. by evaluating the original from which reprints are to be made, the desired values obtained. If there are deviations, these are converted into corresponding actuating signals for activating the actuating motors 17 respectively assigned to the zone screws 15.
  • an evaluation curve of the type indicated in FIG. 2 at 20 is specified per zone, which is an intensity curve when the light pressure transducer 4 is directly acted upon by the associated light source 2, that is to say with the light source 2 not being remitted from the paper web 1, but directly emitted light is obtained.
  • the difference values resulting from the comparison of the intensity curve 12 with the evaluation curve 20 are set in relation to target values taken in the same way from an ideal template. The resulting deviations go into the control signals assigned to the colors. In some cases, it may also be expedient to evaluate the evaluation curve 20 by evaluating an unprinted one Paper web to attract reflected light. This can be of particular advantage when using tinted or colored paper.
EP84104326A 1983-04-20 1984-04-17 Procédé et dispositif de réglage de l'alimentation en encre des encriers d'une machine à imprimer en plusieurs couleurs Ceased EP0123257A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833314333 DE3314333A1 (de) 1983-04-20 1983-04-20 Verfahren und vorrichtung zur regelung der farbzufuhr zu den farbwerken einer mehrfarbendruckmaschine
DE3314333 1983-04-20

Publications (2)

Publication Number Publication Date
EP0123257A2 true EP0123257A2 (fr) 1984-10-31
EP0123257A3 EP0123257A3 (fr) 1986-10-15

Family

ID=6196894

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84104326A Ceased EP0123257A3 (fr) 1983-04-20 1984-04-17 Procédé et dispositif de réglage de l'alimentation en encre des encriers d'une machine à imprimer en plusieurs couleurs

Country Status (4)

Country Link
US (1) US4541336A (fr)
EP (1) EP0123257A3 (fr)
JP (1) JPS6034859A (fr)
DE (1) DE3314333A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228347A1 (fr) * 1985-12-10 1987-07-08 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de commande de l'alimentation en encre pour une machine à imprimer, dispositif d'impression équipé de manière correspondante et dispositif de mesure pour un tel appareil d'impression

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4649502A (en) * 1983-11-04 1987-03-10 Gretag Aktiengesellschaft Process and apparatus for evaluating printing quality and for regulating the ink feed controls in an offset printing machine
US5182721A (en) * 1985-12-10 1993-01-26 Heidelberger Druckmaschinen Aktiengesellschaft Process and apparatus for controlling the inking process in a printing machine
DE3643720C2 (de) * 1986-12-20 1994-03-10 Heidelberger Druckmasch Ag Verfahren zum Ermitteln von Steuer- /Regelgrößen für das Farbwerk von Druckmaschinen
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
DE58901780D1 (de) * 1988-01-14 1992-08-13 Gretag Ag Verfahren und vorrichtung zur farbregelung einer druckmaschine.
DE4209165A1 (de) * 1991-03-21 1992-09-24 Wifag Maschf Verfahren zur einstellung der rasterpunktgroessen fuer eine offset-rotationsdruckmaschine
US5365847A (en) * 1993-09-22 1994-11-22 Rockwell International Corporation Control system for a printing press
US5791249A (en) * 1997-03-27 1998-08-11 Quad/Tech, Inc. System and method for regulating dampening fluid in a printing press
JP5598854B2 (ja) 2010-12-07 2014-10-01 株式会社日立製作所 トレーニングシステム
CN114248541B (zh) * 2021-12-21 2023-12-08 青岛桑纳电气有限公司 一种墨键式墨斗出墨量集中控制主板

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756725A (en) * 1970-10-12 1973-09-04 Harris Intertype Corp Measurement and control of ink density
US3944732A (en) * 1975-02-12 1976-03-16 The Board Of Trustees Of The Leland Stanford University Method and apparatus for improving acousto-electric scanning

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2060000A1 (de) * 1970-12-05 1972-06-15 Hell Rudolf Dr Ing Gmbh Verfahren und Anordnung zur Regelung der Farbgebung beim Drucken
JPS5698634A (en) * 1980-01-09 1981-08-08 Dainippon Printing Co Ltd Printed matter testing device

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3756725A (en) * 1970-10-12 1973-09-04 Harris Intertype Corp Measurement and control of ink density
US3944732A (en) * 1975-02-12 1976-03-16 The Board Of Trustees Of The Leland Stanford University Method and apparatus for improving acousto-electric scanning

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0228347A1 (fr) * 1985-12-10 1987-07-08 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de commande de l'alimentation en encre pour une machine à imprimer, dispositif d'impression équipé de manière correspondante et dispositif de mesure pour un tel appareil d'impression

Also Published As

Publication number Publication date
JPS6034859A (ja) 1985-02-22
DE3314333A1 (de) 1984-10-25
US4541336A (en) 1985-09-17
EP0123257A3 (fr) 1986-10-15

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