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WO1981000083A1 - Procede et dispositif pour la determination des valeurs de consigne permettant en particulier le controle automatique d'imprimeuses - Google Patents

Procede et dispositif pour la determination des valeurs de consigne permettant en particulier le controle automatique d'imprimeuses Download PDF

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Publication number
WO1981000083A1
WO1981000083A1 PCT/EP1980/000041 EP8000041W WO8100083A1 WO 1981000083 A1 WO1981000083 A1 WO 1981000083A1 EP 8000041 W EP8000041 W EP 8000041W WO 8100083 A1 WO8100083 A1 WO 8100083A1
Authority
WO
WIPO (PCT)
Prior art keywords
printing plate
measured
printing
scanning
energy
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/EP1980/000041
Other languages
German (de)
English (en)
Inventor
A Beckert
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.)
Reinhard Mohn GmbH
Original Assignee
Reinhard Mohn GmbH
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 Reinhard Mohn GmbH filed Critical Reinhard Mohn GmbH
Publication of WO1981000083A1 publication Critical patent/WO1981000083A1/fr
Anticipated expiration legal-status Critical
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
    • B41F33/0027—Devices for scanning originals, printing formes or the like for determining or presetting the ink supply

Definitions

  • a method for determining target values for the automatic presetting of printing presses is already known.
  • the target value serves in particular especially for pre-setting the knife distance to the ductor of the inking unit, so that the amount of ink is determined that is needed in each zone to print the desired shape.
  • the amount of ink is a function of the area covered by the image to be printed within a color zone across the circumference of the plate cylinder.
  • the target value for this so-called area coverage is determined from the litho film from which the printing plate is copied, using a densitometric measurement.
  • a densitometer that works in transmitted light is used for this purpose, with which a zone-wide area coverage in the film original is recorded in a film scanning system. Negative and positive films or adhesive assemblies can be used.
  • the zone-wide scanning takes place via glass fiber optics or light wells, with the measured values being electronically integrated and stored over the film length.
  • the mean value from the different templates or films must be taken per zone.
  • the averaged measured values are then converted into the target values using various electronic devices in accordance with the degree of automation of the method, and the target values are used for manual or automatic presetting. Numerous influencing factors are taken into account and coordinated with microprocessors.
  • Such a method and a device for this purpose for. B. in "The Polygraph", 30th year, Issue 8, dated April 20, 1977, pages 489-492.
  • a major disadvantage of the known methods and devices is the zone-wide scanning, which only in certain cases corresponds to the width of the zone setting of the inking units of a printing press. In this respect, there may be overlaps in the zones, which may lead to a falsification of the target value or the area coverage.
  • the zone-wide scanning also has the disadvantage that it is not in every case a whole multiple of the original width or plate width, so that edge zones can exist in which the mean value of the measured values of the scanning zone is falsified.
  • a further falsification of the average results when one and the same original has to be copied in large numbers side by side and / or one below the other on a disk and only the average of the zones of the original has been determined.
  • the most important disadvantage of the known methods is that when copying the originals, influencing factors can become so effective that the printing plate does not produce the printing image that is expected. For example, a grid can be falsified or overexposed or underexposed due to exposure errors.
  • the object of the invention is to show a simple, fast-working method for determining the target value, which supplies more useful values for the presetting, and to provide a device with which the method can be carried out particularly easily.
  • This object is achieved by a method for determining target values for the, in particular, fully automatic presetting of printing presses, the energy change of an energy beam being measured and the measured values being modulated to target values, possibly using microprocessors, characterized in that the A running energy beam is projected onto the surface of the printing plate to be printed and the energy reflected from the surface is measured.
  • a laser beam is preferably used; however, halogen or halogen vapor light can also be used.
  • the area coverage i.e. determines the printing area that reflects the beam.
  • Systems known per se can be used within the scope of the invention. These consist of a light transmitter that emits a driving beam.
  • the driving beam is directed onto the surface of the printing plate and the reflected light energy is measured.
  • the light beam can be reflected in itself (autocollimation) and fed to a receiver in the optical head, or it is received as a result of remission at a freely adjustable angle to the transmitted beam by a light guide system and fed to the signal converter.
  • the measured values of the measuring devices are modulated in a manner known per se to set values and the set values are used for presetting in a manner known per se.
  • a known device has a scanner, the task of which is to move a finely focused light beam continuously and always axially parallel over the printing plate surface.
  • the scanner works together with the optical receiving unit, which is either integrated in the scanner or takes up the optical signals emitted by the printing plate surface in the reflection process and converts them into a video signal.
  • the receiving unit is coupled to an electronic evaluation unit, which evaluates the received electrical signals via video processors and possibly microcomputers and, if necessary, prepares them for controlling the remote ink setting of the printing press.
  • the surface of the printing plate is scanned line by line with the light beam of high running speed of the automatic surface inspection system. It is particularly advantageous that the scanning of the printing plate in the movement is possible due to the high speed of the light beam.
  • the scanning beam causes a constant light spot size over the entire scanning width of the printing plate, the light spot size or the light spot path of the beam being relatively small compared to the partial zone width of the inking unit.
  • the scanner and receiver are coupled to an analog video processor, which is connected to a digital extractor is connected, the digital extractor being connected to a microprocessor.
  • Influencing factors in particular printing machine-specific data, can be programmed into the microprocessor in a manner known per se, which can be processed together with the measured values by means of an operating dialog.
  • the data determined and output are the target date for the press presetting.
  • the method according to the invention enables the target values to be determined in one operation by scanning the printing plate, which means a considerable saving of time.
  • the element is scanned for what is actually printing, ie copy tolerances are also taken into account.
  • the handling of a plate is much easier than that of films or templates; because a film is more likely to be damaged than a printing plate.
  • the scanning zone width can be selected individually, so that the system can be used for different printing machines in relation to the ink zone width and plate size.
  • the integration of the measured values can be optimized by the choice of the beam spot size and the feed.
  • the relatively small point size allows additional information to be determined, e.g. B. whether the scanned zone is predominantly unprinted or predominantly printed with grids or predominantly over the entire surface and also to include this information in the target value calculation.
  • the measured values can be output in a manner known per se via data carriers (tape, magnetic disk, punched tape, etc.) or forwarded directly to the printing press.
  • data carriers tape, magnetic disk, punched tape, etc.
  • printing plates are used which have an aluminum plate as the non-printing carrier plate with a plastic coating as the printing element.
  • the plastic coating can e.g. B. be yellow, brown, blue or purple.
  • the carrier plate can consist of non / copper or measurement, on which a printing
  • the measuring device is calibrated accordingly before scanning a printing plate.
  • one or more calibration markings are arranged on the edge of the printing plate, in particular on the clamping edge, which is known not to be required during the printing process.
  • a narrow full-area marking is arranged on the upper edge part, which corresponds to a 100% printing area.
  • An unprinted area with a 0% printing area can be followed by a printing area with a 50% grid in the lower edge part.
  • These markings are first scanned with the measuring device, the scanned values permitting a statement about the type and color of the plate.
  • the samples are e.g. B. processed in the microprocessor and are used to convert the subsequently determined measured values on the printing plate or to preset the measuring device with respect to the energy density.
  • the new method can work independently of the plate size, the zone width and the zone number of the inking units.
  • the scanning widths and scanning frequencies can be determined with the help of the microprocessor.
  • the measuring device calibrates itself automatically before each scan due to the very original arrangement of calibration marks on the printing plate at a point that is not used for printing anyway.
  • the invention further relates to a device for carrying out the method according to claims 13 and 14.
  • Fig. 2 schematically shows a printing plate developing device with a scanning device.
  • the scanner shown in Fig. 1 preferably works with laser beams. These are generated in the light transmitter 1, deflected via a mirror 2 and fed to a slit optics 3 with a translucent mirror 4. From there, the rays pass through a mirror 5 and a lens 6 onto a fast-running, multi-surface mirror wheel 7, wherein they are moved by the rotation of the wheel and sent to the plane mirror 8. The rays are reflected from the plane mirror 8 to the plane mirror 9 and from there to the concave mirror 10, which focuses them onto the printing plate 12 through a cylindrical lens 11. From there, the rays are reflected according to the reflectance values of the plate Location of the light spot reflects in itself and migrate the same way up. back to the partially transparent mirror 4.
  • the measurement signals can be passed from the receiver 13 into an analog video processor, from there into a digital extractor and from there into a microprocessor, and then appear as averaged target values for a specific color zone setting.
  • the device shown consists of the printing plate development device 14 with various baths 15 known per se for developing the printing plate 12. Transport rollers 15 are arranged between the baths in a manner known per se, which transport the printing plate through the development device.
  • the pressure plate travels through the individual development baths and then arrives at the measuring table 17, on which it is scanned before the rubber coating. After scanning, which takes place in the movement of the printing plate, it arrives in the rubber bath 18, in which it is finally rubberized in a manner known per se. It is therefore essential that the pressure plate is scanned before the gumming, since otherwise the surface of the pressure plate is changed too much.
  • the known receiver 19 is designed as a selective reception system and is arranged outside the transmission device. It can have essentially three light rods 20. The light striking the pressure plate is directed into the middle light guide rod by remission. In the event of deviations from a certain surface condition of the printing plate, part of the remitted light is deflected into the light guide rods arranged on the side. The optical signals of all three light guide rods are evaluated in the electronics.
  • the reflection in the bright zone may be measured with only one light measuring rod (FIG. 2), which is arranged in the area of direct reflection - in the case shown in the area of the central rod 20.
  • the two rods arranged on the side are located in the diffuse area of the reflected beam and can be omitted if necessary or can be used to check the measurement.
  • the direct reflection in the autocollimation process can also be measured.
  • the energy beam not only for integrating the measured values for the zone-wide area coverage, but also for delivering a discrete statement at the measurement location in the area of the z. B. laser spots can be used.

Landscapes

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

Abstract

On mesure la variation d'energie d'un rayon energetique et on module eventuellement au moyen de microprocesseurs les valeurs mesurees pour obtenir des valeurs de consigne en dirigeant un rayon energetique vers la surface d'une planche d'impression (12) et en mesurant l'energie reflechie par la surface de la planche. Il est important d'utiliser une planche d'impression non gommee et un rayon laser permettant de mesurer en densite superficielle de la surface de la planche. Le dispositif pour la mise en oeuvre du procede comprend un scanner travaillant selon le principe de reflexion et qui est dispose dans une machine de traitement (14) pour planches d'impression.
PCT/EP1980/000041 1979-07-02 1980-06-30 Procede et dispositif pour la determination des valeurs de consigne permettant en particulier le controle automatique d'imprimeuses Ceased WO1981000083A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2926629 1979-07-02
DE19792926629 DE2926629A1 (de) 1979-07-02 1979-07-02 Verfahren und vorrichtung zur bestimmung von soll-werten fuer die insbesondere automatische voreinstellung von druckmaschinen

Publications (1)

Publication Number Publication Date
WO1981000083A1 true WO1981000083A1 (fr) 1981-01-22

Family

ID=6074688

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1980/000041 Ceased WO1981000083A1 (fr) 1979-07-02 1980-06-30 Procede et dispositif pour la determination des valeurs de consigne permettant en particulier le controle automatique d'imprimeuses

Country Status (3)

Country Link
EP (1) EP0031829A1 (fr)
DE (1) DE2926629A1 (fr)
WO (1) WO1981000083A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082644A3 (en) * 1981-12-17 1984-05-30 Tokyo Shibaura Denki Kabushiki Kaisha Apparatus for measuring the area of image portion of image-bearing member
EP0115839A3 (en) * 1983-01-31 1985-06-12 Komori Printing Machinery Co., Ltd. Method and system of measuring image area
EP0095606A3 (en) * 1982-05-29 1985-12-11 Heidelberger Druckmaschinen Aktiengesellschaft Method for the determination of area coincidence of a master or printing plate for printing machines
AU2006225247B2 (en) * 2005-10-27 2010-07-29 Hilti Aktiengesellschaft Cast-in element for forming a leadthrough for conduits

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3736629A1 (de) * 1987-10-29 1989-05-11 Heidelberger Druckmasch Ag Vorrichtung zur ermittlung der flaechendeckung
DE3908270C2 (de) * 1988-03-15 1997-08-21 Dainippon Printing Co Ltd Verfahren zur Steuerung eines auf einer Offset-Druckmaschine durchzuführenden Druckauftrages und Anordnung zu dessen Durchführung
JP2002192700A (ja) * 2000-12-26 2002-07-10 Dainippon Screen Mfg Co Ltd 印刷制御装置および記録媒体

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185088A (en) * 1961-12-01 1965-05-25 Harris Intertype Corp Method and apparatus for predetermining settings for ink fountain keys
DE1547447B1 (de) * 1967-01-05 1970-09-24 Sick Erwin Spiegelrad-Abtastanordnung
GB1281888A (en) * 1968-09-13 1972-07-19 Kent Instruments Ltd Improvements in or relating to the measurement of an area
US3958509A (en) * 1974-06-13 1976-05-25 Harris Corporation Image scan and ink control system
GB2000082A (en) * 1977-06-25 1979-01-04 Roland Offsetmaschf Apparatus for the control and regulation of the printing process on a printing press

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3185088A (en) * 1961-12-01 1965-05-25 Harris Intertype Corp Method and apparatus for predetermining settings for ink fountain keys
DE1547447B1 (de) * 1967-01-05 1970-09-24 Sick Erwin Spiegelrad-Abtastanordnung
GB1281888A (en) * 1968-09-13 1972-07-19 Kent Instruments Ltd Improvements in or relating to the measurement of an area
US3958509A (en) * 1974-06-13 1976-05-25 Harris Corporation Image scan and ink control system
GB2000082A (en) * 1977-06-25 1979-01-04 Roland Offsetmaschf Apparatus for the control and regulation of the printing process on a printing press

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0082644A3 (en) * 1981-12-17 1984-05-30 Tokyo Shibaura Denki Kabushiki Kaisha Apparatus for measuring the area of image portion of image-bearing member
EP0095606A3 (en) * 1982-05-29 1985-12-11 Heidelberger Druckmaschinen Aktiengesellschaft Method for the determination of area coincidence of a master or printing plate for printing machines
EP0115839A3 (en) * 1983-01-31 1985-06-12 Komori Printing Machinery Co., Ltd. Method and system of measuring image area
AU2006225247B2 (en) * 2005-10-27 2010-07-29 Hilti Aktiengesellschaft Cast-in element for forming a leadthrough for conduits

Also Published As

Publication number Publication date
EP0031829A1 (fr) 1981-07-15
DE2926629A1 (de) 1981-01-15

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