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EP0029561A1 - Procédé et dispositif pour déterminer des valeurs de réglage prescrites, en particulier pour le préréglage automatique de machines à imprimer - Google Patents

Procédé et dispositif pour déterminer des valeurs de réglage prescrites, en particulier pour le préréglage automatique de machines à imprimer Download PDF

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Publication number
EP0029561A1
EP0029561A1 EP19800107087 EP80107087A EP0029561A1 EP 0029561 A1 EP0029561 A1 EP 0029561A1 EP 19800107087 EP19800107087 EP 19800107087 EP 80107087 A EP80107087 A EP 80107087A EP 0029561 A1 EP0029561 A1 EP 0029561A1
Authority
EP
European Patent Office
Prior art keywords
zone
scanned
plate
image
printing
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.)
Withdrawn
Application number
EP19800107087
Other languages
German (de)
English (en)
Inventor
Alexander 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 EP0029561A1 publication Critical patent/EP0029561A1/fr
Withdrawn legal-status Critical Current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

  • the invention relates to a method and a device for determining target values for the automatic presetting of printing machines in particular.
  • Printing machines that are equipped with a remote ink setting.
  • a method for determining target values for the automatic presetting of printing presses is already known.
  • the target value is used in particular to preset the knife distance to the ink duct's ductor, so that the amount of ink that is required in each zone is determined in order to print the desired shape.
  • the amount of color 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 working in transmitted light is used, 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 various templates or films must be taken for each 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.
  • There are numerous influences factors taken into account and coordinated with microprocessors. Such a method and a device for this purpose are known, 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.
  • a method for determining target values for the in particular fully automatic presetting of printing presses wherein the energy change of an energy beam is measured and the measured values are modulated to target values, if necessary with microprocessors, and wherein on the surface of the ones to be printed Printing plate projected a running beam of energy and whose 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. the printing area, which reflects the beam.
  • the determination of the target values in one operation is made possible by scanning the printing plate, which saves considerable time points.
  • the element is scanned for what actually prints, ie copying tolerances are taken into account.
  • the "handling" of a record is much easier than that of films or originals; 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 various printing machines with respect 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 rasters or predominantly over the entire surface, and also to include this information in the calculation of the target value.
  • the proposed method thus works independently of the plate size, the zone width and the zone number of the inking units. It is preferably carried out in a printing plate developing device before gumming.
  • the present invention is intended to provide a further improved possibility of scanning the printing plate for determining the target value.
  • the invention therefore relates to 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 are modulated to desired values, possibly with microprocessors, and the surface of the printing plate to be printed is scanned, characterized in that the zone image of the printing plate is stored on a storage plate and the surface of the stored image with a running energy beam, preferably a running electron beam is scanned.
  • the back of a storage disk on which the zone image is stored is preferably scanned with slow electrons.
  • the signal plate or storage plate is housed in a television tube, so that the zone image of a television camera is projected onto the plate.
  • the signal plate is translucent, but electronically conductive, preferably by a homogeneous semiconductor photo layer, for. B. from selenium, antimony sulfide or lead oxide is evaporated.
  • the resistance of this semiconductor photo layer changes with the illuminance.
  • the internal photo effect is used for scanning, each element of the surface of this semiconductor layer acting like a small storage capacity, to which the light-dependent resistance of the semiconductor layer is connected in parallel.
  • the signal plate usually has a positive plate voltage. The scanning beam sliding over the image zone element then charges the storage capacity negatively.
  • the storage capacity is then discharged in a positive direction via the resistance of the semiconductor photo layer, the more discharged the more the layer has been exposed at the point in question, ie the smaller the latter Resistance is.
  • the electron beam recharges the storage capacity to the cathode potential, the equalizing current flowing in this case providing the signal that can be used for the target value determination.
  • the signals of an image zone recorded, stored and scanned by the camera are then integrated and averaged for the measured value using conventional measuring electronics, and the measured value is stored.
  • the measured values of the different zones are converted into the target values using known electronic devices and the target values are used for manual or automatic presetting of the printing press. As usual, numerous influencing factors can be taken into account and coordinated with the measured values via microprocessors.
  • the surface of the image of the printing plate zone is scanned line by line with the electron beam of high speed of travel of the tube with semiconductor photo layer. It is particularly advantageous that, due to the high running speed of the electron beam, it is possible to scan the printing plate in motion.
  • the scanning beam causes a constant spot size over the entire scanning width of the printing plate, the spot size or the spot path of the electron beam being relatively small compared to the zone width of the inking unit.
  • the image capture device with a to couple analog video processor connected to a digital extractor, the digital extractor being connected to a microprocessor.
  • Influencing factors in particular data specified by the printing press, can be programmed into the microprocessor in a manner known per se and can be processed together with the measured values by means of an operating dialog.
  • the data determined and output are the target data for the press presetting.
  • 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 copper or brass, on which a non-printing chrome layer sits. For this reason, the exposure values on the semiconductor photo layer of the tube are different.
  • the invention is applicable to these different print media.
  • 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-surface marking is arranged on the upper edge part corresponds to a 100 percent printing area.
  • An unprinted area with a 0 percent printing area can be followed by a printing area with a 50 percent grid in the lower edge area.
  • information can be accommodated on the edge, such as, for. B. the order number, the plate number, etc., which can facilitate the identification of the plates for the further processes.
  • marking images are first scanned with the electron beam, 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 in relation to the energy density.
  • the zone widths and scanning frequencies can be determined with the aid of the microprocessor.
  • the measuring device calibrates itself practically automatically before each measuring process due to the very original arrangement of calibration marks on the printing plate at a point which is not used for printing anyway.
  • Tubes with semiconductor photo layers are known. You will e.g. B. called Vidikon or Plumbikon. However, their use has been used for completely different purposes. New cameras equipped with such tubes can already scan 512 points per line, so that they can be used particularly well for the purposes of the invention. With a special tube which was developed in the context of the invention, 1024 points per line can be scanned, so that the averaged measured values are extraordinary Lich accurate and representative of the scanned measuring zone.
  • the inventive method offers the possibility of standing or z. B. ongoing in the process, i.e. to scan moving plate, it is advantageous that the fully developed and rubberized printing plate can be used.
  • the invention is explained in more detail by way of example with reference to the drawing, in which a device for carrying out the method according to the invention is shown schematically.
  • the camera 1 which is equipped with a tube with a semiconductor photo layer 2, is used to determine the target value.
  • the camera 1 is mounted above a zone shaft 3, under which the pressure plate 4 is arranged.
  • the camera 1 consists of the housing 5 and the optics 6.
  • Inside the camera is the tube 2.
  • This has the tube housing 7, in which the storage plate 8 with the semiconductor photo layer is accommodated on the optics side.
  • the radiation generation system 9 Arranged opposite the storage plate 8 is the radiation generation system 9, which generates the electron beam 10, which is directed onto the rear side of the storage plate 8.
  • the beam 10 is surrounded by the anode 11 with an anode grid.
  • the deflection coils 12 and concentration coils 13 and the adjustment coils 14 are arranged outside the housing 7.
  • a voltage is applied to the memory plate 8 via line 15, line 16 branching off from line 15 and supplying the signal
  • the zone shaft has two tasks. It is intended to prevent reflections and to cover neighboring zones shield so that shifts in brightness caused by overexposure are prevented.
  • Conventional contrast filters 17 can be inserted between the camera 1 and the zone shaft 3.
  • the zone shaft 3 expediently consists of a rectangular cover plate 18 in which the camera hole 19 is provided in the center. Under the plate 18 20 shaft walls 21 are articulated in the region of the long sides, which run in a V-shape and at the end form the zone gap 22. The articulated arrangement allows the zone gap 22 to be widened or narrowed.
  • the zone shaft 3 is laterally closed off by side walls 23, only one of which is shown; because the drawing shows the zone shaft in section.
  • lighting fixtures 24 are mounted next to and parallel to the shaft walls 21, which in particular illuminate the zone of the pressure plate 4 to be removed with the desired illuminance.
  • the inner surfaces 25 of the shaft walls 21 are preferably made of matt black, which means that reflections can be excluded.
  • the operation of the device can be seen from the drawing.
  • One zone or line of the plate is recorded by the camera and stored by the tube.
  • the stored zone image is then scanned with the electron beam 10, the signals being output via line 16.
  • the plate can either be passed under the zone shaft or the camera can be guided with the zone shaft over a resting plate.
  • the target value acquisition unit is expediently arranged directly after a copying system, so that the target values can be obtained immediately after copying.

Landscapes

  • Manufacture Or Reproduction Of Printing Formes (AREA)
EP19800107087 1979-11-22 1980-11-15 Procédé et dispositif pour déterminer des valeurs de réglage prescrites, en particulier pour le préréglage automatique de machines à imprimer Withdrawn EP0029561A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19792947054 DE2947054A1 (de) 1979-11-22 1979-11-22 Verfahren und vorrichtung zur bestimmung von soll-werten fuer die insbesondere automatische voreinstellung von druckmaschinen
DE2947054 1979-11-22

Publications (1)

Publication Number Publication Date
EP0029561A1 true EP0029561A1 (fr) 1981-06-03

Family

ID=6086604

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800107087 Withdrawn EP0029561A1 (fr) 1979-11-22 1980-11-15 Procédé et dispositif pour déterminer des valeurs de réglage prescrites, en particulier pour le préréglage automatique de machines à imprimer

Country Status (2)

Country Link
EP (1) EP0029561A1 (fr)
DE (1) DE2947054A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069572A1 (fr) * 1981-07-06 1983-01-12 Philip Emanuel Tobias Procédé et dispositif utilisé pour ajuster une machine à imprimer
EP0095606A2 (fr) 1982-05-29 1983-12-07 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de détermination de la coincidence de surfaces d'un modèle ou d'une plaque pour machines d'impression
EP0142469A1 (fr) * 1983-11-04 1985-05-22 GRETAG Aktiengesellschaft Procédé et dispositif de réglage d'encre dans une rotative offset et rotative offset équipée d'un tel dispositif

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3302798C2 (de) * 1983-01-28 1987-03-05 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Vorrichtung zum Voreinstellen an Druckmaschinen
DE3334019A1 (de) * 1983-09-21 1985-03-28 Albert-Frankenthal Ag, 6710 Frankenthal Verfahren und vorrichtung zur einstellung der den farbzonen eines farbwerks zugeordneten dosierorgane

Citations (1)

* 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

Patent Citations (1)

* 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

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0069572A1 (fr) * 1981-07-06 1983-01-12 Philip Emanuel Tobias Procédé et dispositif utilisé pour ajuster une machine à imprimer
EP0095606A2 (fr) 1982-05-29 1983-12-07 Heidelberger Druckmaschinen Aktiengesellschaft Procédé de détermination de la coincidence de surfaces d'un modèle ou d'une plaque pour machines d'impression
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
AT391447B (de) * 1982-05-29 1990-10-10 Heidelberger Druckmasch Ag Verfahren zur ermittlung der flaechendeckung einer druckvorlage oder druckplatte fuer druckmaschinen und vorrichtung zur durchfuehrung des verfahrens
EP0142469A1 (fr) * 1983-11-04 1985-05-22 GRETAG Aktiengesellschaft Procédé et dispositif de réglage d'encre dans une rotative offset et rotative offset équipée d'un tel dispositif
EP0142470A1 (fr) 1983-11-04 1985-05-22 GRETAG Aktiengesellschaft Procédé et dispositif d'analyse de la qualité d'impression d'un imprimé, de préférence imprimé sur une rotative offset et rotative offset équipée d'un tel dispositif
US4660159A (en) * 1983-11-04 1987-04-21 Gretag Aktiengesellschaft Process and apparatus for the regulation of ink feed controls in an offset printing machine
US4665496A (en) * 1983-11-04 1987-05-12 Gretag Aktiengesellschaft Process and apparatus for the evaluation of the printing quality of a printed product by an offset printing machine

Also Published As

Publication number Publication date
DE2947054A1 (de) 1981-05-27

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Inventor name: BECKERT, ALEXANDER