EP3921164B1 - Procédé de réglage d'un profil colorimétrique dans une presse offset à feuilles utilisant des feuilles préimprimées de rebut - Google Patents

Procédé de réglage d'un profil colorimétrique dans une presse offset à feuilles utilisant des feuilles préimprimées de rebut Download PDF

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Publication number
EP3921164B1
EP3921164B1 EP20701173.5A EP20701173A EP3921164B1 EP 3921164 B1 EP3921164 B1 EP 3921164B1 EP 20701173 A EP20701173 A EP 20701173A EP 3921164 B1 EP3921164 B1 EP 3921164B1
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EP
European Patent Office
Prior art keywords
sheets
sheet
control unit
printing press
image
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Application number
EP20701173.5A
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German (de)
English (en)
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EP3921164A1 (fr
Inventor
Stefan Budach
Felix Hartmann
Michael Köllmann
Harald Willeke
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Koenig and Bauer AG
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Koenig and Bauer AG
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Publication of EP3921164A1 publication Critical patent/EP3921164A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F7/00—Rotary lithographic machines
    • B41F7/16—Rotary lithographic machines for printing on non-deformable material, e.g. sheet metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B41F31/045—Remote control of the duct keys
    • 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
    • B41P2233/10—Starting-up the machine
    • B41P2233/11—Pre-inking

Definitions

  • the invention relates to a method for setting a color profile in a sheet-fed offset printing press according to claim 1.
  • a method for setting an area coverage wherein the area coverage is achieved by a quantity of printing ink transferred to a printing material by an inking unit of a printing press, wherein when a final phase of a printing process previously executed by the printing press is reached, an ink supply to the inking unit is switched off at least in zones or is interrupted in the inking unit, with the quantity of printing ink remaining on the printing material side after the ink supply in the inking unit has been switched off or interrupted being transferred to the printing material in the final phase of the printing process previously carried out by the printing press until the quantity of printing ink transferred to the printing material has equaled
  • the area coverage that takes place corresponds to a target value of the area coverage, with a changeover of the printing press from the printing process currently running in this printing press to a subsequent printing process in an automated control process ss is carried out, with the same printing ink being transferred from the inking unit to the printing material in the subsequent printing process as in the previous printing process, with the target value of
  • a method for operating sheet-fed printing presses in which a sheet-fed printing press lays out a stack of sheets in one printing pass, which stack contains at least one waste sheet and the sheets in this stack of sheets are printed in a subsequent printing pass, with the waste sheet being stored in the following printing pass by means of a storage or Sensor device of a sheet-fed printing press is detected, this memory or sensor device interacting with a machine controller which controls the sheet-fed printing press during the subsequent printing pass as a function of the detection result determined by the memory or sensor device.
  • a method for detecting an order change in a stack of sheets to be processed in which a sheet is marked by being marked in a preceding printing pass at least remains partially unprinted.
  • a z. B. as a sheet-fed printing press or as a web-fed printing press trained printing machine a variety of print images with any design in their respective color and / or brightness and often changing motifs on a substrate z. B. from paper, cardboard, cardboard, from a plastic or from a metallic material to print.
  • the object of the invention is to provide a method for setting a color profile in a sheet-fed offset printing press.
  • the advantages that can be achieved with the invention consist in particular in the fact that the printing press can be changed over quickly and economically from a first printing process currently running in the printing press to a subsequent second printing process.
  • machine and operating costs can also be reduced because the printing press with the subsequent second printing process reaches the production of salable printed products after a very short time.
  • the distribution of this printing ink that occurs during the execution of the first printing process along the transport path of the printing ink is transverse to a transport direction of the printing material that is being transported through the printing press and is to be printed on i. i.e. R. uneven, d. H. along a line of intersection of the transport path of the printing ink that runs transversely to the transport direction of the printing material, several mostly differently shaped accumulations for the printing ink that is ultimately to be transferred to the printing material are formed, which is due to the fact that the printing material to be printed is transverse to its own during its transport through the printing press Transport direction due to an i. i.e. R. uneven design of a print image to be produced on the printing material absorbs printing ink unevenly.
  • the transport path of the printing ink leads, starting from an ink metering system belonging to an inking unit of the printing press, through the inking unit supplied with ink by the relevant ink metering system, via a z. B. on one of the belonging to a printing unit of the printing press printing unit cylinder arranged printing form up to the to be printed with the printing ink in question.
  • each printing unit In a printing press, along the transport path of the printing material in its transport direction, there are usually several printing units arranged in a row, each with its own inking unit, different printing inks being transferred onto the same printing material transported through the printing press by means of at least two of these printing units.
  • a plurality of printing units, each with their own inking unit, can also be provided on both sides of the transport path of the printing material.
  • a printing machine producing a printed product in multi-color printing can transport the printing material along the transport path, e.g. B. with the inks cyan, magenta, yellow and black.
  • the inking unit of each printing unit is z. B. designed as a roller inking unit, z. B.
  • the color dosing system e.g. B. an ink fountain, which supplies the inking unit in question with ink, z.
  • At least one belonging to the inking unit transfers the inking roller provided by the inking, z. B. in the zones of the ink metering system arranged transversely to the transport direction of the printing material, in particular differently metered ink onto the at least one printing forme, the e.g. B. is arranged on the forme cylinder assigned to this inking unit.
  • the relevant inking unit of the printing press is to transfer the same printing ink to the printing material in the subsequent second printing process as in the first printing process: After the end of the first printing process currently running in the printing press, at least individual rollers, preferably all rollers of the relevant inking unit, are washed and thus freed of residual ink, ie ink left over from the first printing process. After this washing process, the inking unit in question is adjusted to metering and transporting the printing ink required to carry out the subsequent second printing process. This procedure requires a lot of time and leads to a high consumption of printing ink.
  • a further procedure consists in turning off an ink supply from the relevant ink metering system to the inking unit or at least interrupting it in the inking unit when a final phase of the first printing process previously executed by the printing press is reached, with the after stopping or interrupting the ink supply in the inking unit amount of ink remaining on the substrate side in the final phase of the printing process previously executed by the printing press, e.g. B. is still transferred to the printing material for a certain time, in particular until the ink remaining in the inking unit from the first printing process is at least almost used up.
  • Such a procedure is e.g. B. from the DE 10 2008 029 998 A1 famous. This empty printing of the inking unit produces waste to a not inconsiderable extent. This procedure is also time-consuming.
  • the distribution of the printing ink, which originates from the first printing process and is transverse to the transport direction of the printing material is in principle retained, which can have an unfavorable effect on a proof of the subsequent second printing process.
  • the proof of the subsequent second printing process is carried out deliberately with the distribution of the printing ink originating from the first printing process and existing transversely to the transport direction of the printing material, wherein during the proof of the subsequent second printing process the dosage of the z. B. in the respective zones of the ink metering system arranged transversely to the transport direction of the printing material is adapted to the metering required for the execution of the subsequent second printing process.
  • This procedure then leads to difficulties if in a zone or in several zones a surface coverage of the new second printing process to be produced therein is very small in places or completely in comparison to the previous first printing process. In this case, the excess printing ink in the affected zone must be removed completely during the printing process, i. H. the second printing process take place. This can take a long time and result in a not inconsiderable amount of waste.
  • the at least one printing forme arranged on a forme cylinder and the outer surface of the transfer cylinder interacting with this forme cylinder are only printed clean by removing the at least one inking roller belonging to the inking unit from the forme cylinder in question and continuing the first printing process until the printing ink remaining on the at least one printing forme and/or on the lateral surface of the transfer cylinder is at least almost used up during the first printing process. Included the distribution of the printing ink, which originates from the first printing process and is transverse to the transport direction of the printing material, is retained in the inking unit, which can have an unfavorable effect on a proof of the subsequent second printing process.
  • high-priced means that each individual unprinted sheet intended as printing material already costs a few euros, so that the usual consumption of a three-digit number of sheets until the sheet-fed printing press is ready for production is an expensive affair and has a considerably negative impact, especially for smaller print jobs beats.
  • a method which, in particular, brings a sheetfed offset printing press to the desired coloration significantly faster and with considerably less waste than the resulting sheets in a first proof after starting production or in a proof after a job change.
  • the aim is to save material costs by reducing waste and unproductive machine time and labor costs by shortening the proofing phase.
  • an inking unit with rollers cannot react spontaneously or erratically with regard to the amount of printing ink transported to the printing material, but always takes a certain amount of time to adapt the amount of printing ink required on the printing material to a new desired color profile, starting from a previous color profile.
  • Each sheet-fed offset printing machine thus has a certain time constant for its reaction to a changed setting of ink zone openings on an inking unit, which corresponds to a certain number of sheets, ie printed sheets, transported through this sheet-fed offset printing machine.
  • Color density values, which are detected on a printed sheet inked with this changed setting typically react to a changed setting of ink zone openings on an inking unit in the form of an exponential function.
  • the 1 shows an example of a section of a sheet-fed offset printing press 01, shown only schematically, with several, e.g. B. four in the transport direction T of a printed sheet 02, in particular a z. g. as a sheet metal plate, printing units 03 arranged in a row, the printed sheets 02 being guided one after the other along a transport path through this sheet-fed offset printing press 01.
  • Each of these printing units 03 has an inking unit 04.
  • the respective inking unit 04 has, among other things, a z. B. an ink fountain 06 and an ink ductor 07 having an ink metering system on and in a roller train transporting ink, e.g. B.
  • At least one ink transfer roller 08 possibly an ink lifter 14 and at least one, preferably several, z.
  • two inking rollers 09 which are each employed on a forme cylinder 11 of the printing unit 03 or at least are adjustable, with this forme cylinder 11 rolling on a transfer cylinder 12 at least during a printing process, with the transfer cylinder 12 in turn being adjusted against an impression cylinder 13, with the printed sheet 02 passing through a gap formed between the transfer cylinder 12 and the impression cylinder 13.
  • the other printing units 03 are constructed accordingly. A different ink can be transferred to the same printed sheet 02 in each of the printing units 03.
  • the relevant inking unit 04 providing the relevant printing ink has a plurality of ink zones arranged in a row transversely to the transport path of the printed sheets 02, with each of these ink zones having an ink metering element set or at least adjustable by a control unit 16 or regulating device 16 for metering the ink in the relevant ink zone onto the printed sheets 02 the amount of printing ink to be applied is arranged.
  • the respective ink dosing system ie its dosing organs or ink dosing elements and/or its ink ductor 07, is e.g. B.
  • control unit 16 or control device 16 via a communication network 22, at least in terms of data technology, to the control unit 16 or control device 16, with at least one control command originating from this control unit 16 or control device 16 by means of the metering elements or ink metering elements and/or the ink ductor 07 controlling the ink supply to the relevant inking unit 04 with regard to the quantity of printing ink to be fed to the relevant printed sheet 02 can be adjusted in zones.
  • At least one detection device 17 is preferably located inside sheet-fed offset printing press 01, in particular in or on the last printing unit 03 that prints on the relevant printed sheet(s) 02.
  • the relevant detection device 17 detects at least one color density, e.g. B. densitometrically and forwards their respective at least one measured value as a color density value z. B. likewise via the communication network 22 of the control device 16.
  • the at least one detection device 17 records a colorimetric value of at least one print image generated on the printed sheet 02, e.g. B. detected spectrophotometrically.
  • the detection device 17 or one of the detection devices 17 z. B.
  • the relevant detection device 17 z. B. at least one camera, in particular an electronic, preferably video-optical camera, with which the relevant detection device 17 of the printed image generated on the printed sheet 02 by a photographic image z. B. captures a sequence of images. From the recorded image, ie the captured image, the control unit 16 or control device 16 can, for. B. the respective color density and / or at least one colorimetric value, preferably of all the printing inks involved in the structure of the print image in question, e.g. B. be determined by separation. It can e.g. B. be provided that several printing units 03 each at least one z. B. for a specific ink optimized detection device 17 is assigned.
  • the detection device 17 is arranged in the transport direction T of the printed sheets 02 at the output of the respective printing unit 03.
  • the detection device 17 detects z. B. the color density and/or at least one colorimetric value directly in the print image in question or in a color measurement strip formed on the printed sheet 02 in question, with several color measurement fields preferably being arranged side by side or in a row in the color measurement strip in question.
  • the measured value recorded by the relevant recording device 17 forms an actual value for a z. B. surface coverage of at least one printing ink transferred to the printed sheet 02 in question, which can be determined based on its color density.
  • the concept of area coverage refers to a z. B. percentage of coverage of the printing material with at least one of the printing ink applied to this printing material in the printing process, with the indication of area coverage being based on a total area of the printed image or on a partial area thereof, e.g. B. can be related to only a single zone running through the printed image in the form of a strip.
  • the attitude of Area coverage takes place in particular with reference to several different sub-areas of the same printed image, preferably arranged in parallel strips, the associated area coverage being set for several, in particular for each of these sub-areas.
  • the control unit 16 or regulating device 16 is connected in terms of data technology to at least one memory device 18 and, if appropriate, also to an operating device 19, with at least one target value for the area coverage and/or the color density and/or the at least one colorimetric value being stored in the memory device 18 , wherein the respective actual value and target value of the area coverage and/or the color density and/or the at least one colorimetric value each relate to the same total area or partial area of the print image in question.
  • Operating device 19 is used to manually input values and/or control commands to control unit 16 or regulating device 16.
  • control unit 16 or control device 16, the memory device 18 and the computing unit 19 can be formed in the same assembly, which is in the 1 is indicated by a dashed border, this assembly can be referred to as a color controller 24.
  • This assembly or at least individual of its components can be connected in terms of data technology to a control station 21 belonging to the sheetfed offset printing press 01, ie to a higher-level control unit, or can be designed or arranged to be integrated in the control station 21.
  • a display device 23 is connected in terms of data technology, on which at least one image of one of the printed sheets 02 inked in the sheet-fed offset printing press 01, captured by the relevant capture device 17, is displayed.
  • 2 illustrates the conversion of the sheet-fed offset printing press 01 from a printing process currently running in this printing press to a subsequent printing process, with the 2 the print image in question on a print sheet 02 of a currently running print process (job A) and in the right-hand column of the 2 the corresponding printed image on a printed sheet 02 of a new one subsequent printing process (order B) is shown. This is how it shows 2 the initial situation and, in comparison, the desired new situation.
  • a method for setting an ink profile in a sheet-fed offset printing press 01 will now be described below, with which the sheet-fed offset printing press 01 can be switched from a printing process currently running in this printing press to a subsequent printing process, particularly when using high-priced printing materials, e.g. B. of sheet metal, can be changed quickly and inexpensively.
  • this sheet-fed offset printing press 01 a plurality of printed sheets 02—hereinafter referred to as sheets 02 for short—are guided through this sheet-fed offset printing press one after the other along a transport path, with these sheets 02 being inked with at least one printing color on the transport path.
  • the sheetfed offset printing press 01 has at least one inking unit 04 that provides the printing ink in question, each with a plurality of ink zones arranged in a row transversely to the transport path of the sheets 02, with each of these ink zones having an ink metering element set or at least adjustable by a control unit 16 for metering the in the amount of printing ink to be applied to the sheet 02 in the relevant ink zone.
  • the control unit 16 sets the color profile that applies to this inking unit 04 by adjusting the respective ink metering elements of the relevant inking unit 04.
  • control unit 16 iteratively sets the respective color profile applicable to the inking unit 04 in question for its target inking based on color density values and/or colorimetric values recorded on several of these sheets 02 and based on a recorded image of a print image applied to the respective sheet 02 a.
  • the respective color density values and/or the respective colorimetric values and also the respective image of the print image in question applied to the respective sheet are each with at least a detection device 17 located in sheet-fed offset printing press 01 and connected at least in terms of data technology to control unit 16.
  • At least the following packs of sheets 02 are then fed one after the other through this sheetfed offset printing press 01, with one metal plate preferably being used as the waste sheet and/or as the good sheet: a) a first pack of sheets 02 consisting of a plurality of waste sheets, b) a second packet consisting of several good sheets, and c) at least one third packet of sheets 02, each with several waste sheets and with at least one good sheet each.
  • the waste sheets of the first bundle and the good sheet(s) of the second bundle are each inked according to the color profile that does not correspond to the target inking, from which control unit 16 used when setting the color profile of the at least one inking unit 04 when converting, e.g. B.
  • the control unit 16 recognizes the good sheets of the second pack either as a result of a z. B. by an operator of the sheet-fed offset printing press 01 made manual input on the operating device 19 data-technically connected to the control unit 16 or, in a higher technical development stage, in each case automatically as a good sheet.
  • the control unit 16 determines a respective position of a plurality of color measuring fields, with each position of these color measuring fields being arranged in one of the ink zones of the relevant inking unit 04. Following the second bundle of sheets 02 fed through the sheet-fed offset printing press 01, the control unit 16 uses the relevant recording device 17 to record the respective color density values and/or colorimetric values of the other sheets 02 fed through this sheet-fed offset printing machine 01 at the respective specified positions of the color measuring patches.
  • control unit 16 uses the relevant detection device 17 to capture an image of the print image applied to the respective sheet 02 from the sheets 02 fed through the sheet-fed offset printing press 01 at the latest at the beginning of the sheets 02 of the second bundle.
  • control unit 16 stores a master image upon detection of the good sheet(s) in the second bundle, the master image having at least one contour of the print image to be created on the sheets 02 during continuous printing of the sheet-fed offset printing press 01.
  • the control unit 16 compares the respective images recorded with the relevant recording device 17 of the sheets 02 fed through the sheet-fed offset printing press 01 following the second bundle in each case with the master image, with the control unit 16 checking these additional sheets 02 for the presence of a print image corresponding to the master image checks.
  • the control unit 16 evaluates sheets 02 with a print image that corresponds to the master image as a good sheet and sheet 02 with a print image that does not correspond to the master image as a waste sheet. The control unit 16 then leaves sheets 02 that are classified as waste sheets in the formation of the respective color profile, the set by control unit 16 following the second bundle of sheets 02 fed through sheet-fed offset printing press 01, so that only sheets 02 evaluated as good sheets are used to form the respective new color profile to be set. Accordingly, starting with the sheets 02 of the third pack, the control unit 16 iteratively sets the respective color profile on the relevant inking unit 04 based on the respective color density values and/or colorimetric values recorded from good sheets until it matches the respective color profile applicable for the target inking.
  • control unit 16 determines a mean value from a number of color density values and/or colorimetric values recorded with the relevant detection device 17 in the same positions of the respective good sheets of the third bundle and uses these mean values to set the respective color profile.
  • the master image can be created by the control unit 16 in such a way that the control unit 16 reduces the resolution, given by its number of pixels, of the relevant originally recorded image of the good sheet or sheets of the second packet and uses the remaining number of pixels as an image signature representing the master image, wherein the control unit uses the image signature representing the master image to check the presence of a print image corresponding to this master image on sheets 02 fed along the transport path through the sheet-fed offset printing press 01 after the master image has been created.
  • the control unit 16 forms the respective image signature of the master image, e.g. B. separately for each color channel of the detection device 17 and uses the color channel formed image signature of the master image to check the presence of a print image corresponding to this master image.
  • the master image can be formed from the respective image of the good sheet or sheets of the second pack.
  • the control unit 16 i. i.e. R. enters the respective color profile, which is set at the end of the last third pack of sheets 02, on the relevant inking unit 04 as the color profile that applies to the production run.
  • waste sheets typically 40 to 50 waste sheets are used for the first pack. At least these waste sheets of the first pack form so-called pre-run waste for the basic inking of the sheets 02 after the respective printing ink has entered the relevant inking unit 04.
  • the third packs e.g. B. 10 to 15 sheets 02 are used, with the control unit 16 only using the sheets recognized as good sheets in each of these third packages to improve the respective color profile, until the achieved inking of the sheets 02 corresponds to the respective color profile applicable to the desired inking within previously defined permissible tolerance limits.
  • the color profile applicable to the target inking is accordingly set and/or adjusted step by step by the control unit 16 on the basis of the detected good sheets serving as support points.
  • the method proposed here takes into account, on the one hand, that the color density values detected as a reaction to a changed setting of ink zone openings on an inking unit 04 on a sheet 02 inked in sheetfed offset printing press 01 with this changed setting cannot change abruptly or suddenly, but that these color density values only change after a specified time, i. H. reach a new stable state after a certain machine running time.
  • the method proposed here succeeds in setting the color profile applicable for the target inking with only the smallest possible number of high-priced sheets 02.
  • the proposed method for setting a color profile in a sheet-fed offset printing press 01 uses pre-printed waste sheets and unprinted good sheets when converting after a job change or when making a proof on the sheet-fed offset printing press 01 in question, with at least one good sheet being printed through repeatedly, i.e. in the form of a plurality of consecutive packs, in each case after a number of waste sheets the sheet-fed offset printing press 01 is guided and the waste sheets and good sheets are each inked, in particular by means of at least one inking unit 04 each having a plurality of ink zones, with the inked good sheets in the sheet-fed offset printing press 01 owing to a z.
  • FIG. 3 once again illustrates the chronological sequence of the proposed method for setting a color profile in a sheetfed offset printing press 01 to be set for a new print job via a timeline t running from left to right. It is assumed that at a point in time t0 the conversion of the relevant sheetfed offset printing press 01 begins after a job change or the proofing of a new print job.
  • the proposed method starts with the fact that z. B. Waste sheets that are provided on a feeder of sheet-fed offset printing press 01 and are already provided with a printed image from at least one previous printing process, i.e. waste sheets that are printed and not intended for sale, are fed through sheet-fed offset printing press 01 and inked by the at least one inking unit 04 of this sheet-fed offset printing press 01 will.
  • This is a first packet P1 of sheets 02 with z. B. 40 to 50 waste sheets, which are fed through this sheet-fed offset printing press 01 one after the other.
  • a color profile that no longer corresponds to the previous print job, but in any case does not yet correspond to the target inking of the new print job, is set on the relevant inking units 04.
  • an inflow of printing ink to the respective inking unit 04 is generally not reduced or even stopped.
  • a respective position of a plurality of color measurement patches is also determined, at which, in the case of further sheets 02 fed through the sheet-fed offset printing press 01, a Control unit 16 of this sheetfed offset printing press 01, whose respective color density values and/or colorimetric values are recorded. From point in time t1 at the latest, an image of the print image applied to the respective sheet 02 is captured with the aforementioned or another capture device 17 from the sheets 02 of the second bundle P2 fed through this sheet-fed offset printing machine 01 and from all other sheets 02 fed through the sheet-fed offset printing machine 01.
  • a master image is also stored in a memory device 18 of control unit 16, the master image having at least one contour of the print image to be created on sheet 02 in continuous printing of sheet-fed offset printing press 01 in accordance with the new print job to be processed.
  • the control unit 16 compares the images of the respective images recorded with the appertaining recording device 17 following the second packet P2 in each case by the sheet-fed offset printing machine 01, each with the stored master image, with control unit 16 checking these additional sheets 02 for the presence of a print image corresponding to the master image.
  • control unit 16 evaluates sheets 02 with a print image that corresponds to the master image as a good sheet and sheets 02 with a print image that does not correspond to the master image as waste sheets.
  • control unit 16 also begins iteratively setting the respective color profile on the relevant inking unit 04 based on the respective color density values and/or colorimetric values recorded from good sheets until it matches the respective color profile applicable for the target inking, with from time t2 several packs P3n, each consisting of several waste sheets and at least one good sheet each, are fed through this sheet-fed offset printing press 01.
  • control unit 16 disregards sheets 02 that it assesses as waste sheets. Only the sheets 02 recognized as good sheets by the control unit 16 serve as support points for the step-by-step setting of the respective color profile applicable to the target inking.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Making Paper Articles (AREA)

Claims (11)

  1. Procédé pour le réglage d'un profil d'encre dans une machine à imprimer offset à feuilles (01), dans lequel plusieurs feuilles (02) sont guidées successivement le long d'une voie de transport à travers cette machine à imprimer offset à feuilles (01), dans lequel ces feuilles (02) sont encrées sur la voie de transport avec au moins une encre d'impression, dans lequel la machine à imprimer offset à feuilles (01) présente au moins un dispositif d'encrage (04) fournissant l'encre d'impression concernée avec respectivement plusieurs zones d'encre juxtaposées transversalement par rapport à la voie de transport des feuilles (02), dans lequel respectivement un élément de dosage d'encre réglé ou au moins pouvant être réglé par une unité de commande (16) pour le dosage de la quantité d'encre d'impression à appliquer dans la zone d'encre concernée sur les feuilles (02) est disposé dans chacune de ces zones d'encre, dans lequel l'unité de commande (16) par un réglage des éléments de dosage d'encre respectifs du dispositif d'encrage (04) concerné règle le profil d'encre valable pour ce dispositif d'encrage (04), dans lequel le dispositif d'encrage (04) concerné encre les feuilles (02) dans une impression continue de la machine à imprimer offset à feuilles (01) respectivement avec un encrage de consigne, dans lequel l'unité de commande (16) règle le profil d'encre respectif valable pour le dispositif d'encrage (04) concerné pour son encrage de consigne sur la base de valeurs de densité d'encre et/ou valeurs colorimétriques acquises sur plusieurs de ces feuilles (02) et sur la base d'une image acquise d'une image d'impression appliquée sur les feuilles (02) respectives respectivement de manière itérative, dans lequel les valeurs de densité d'encre respectives et/ou les valeurs colorimétriques respectives et également l'image respective de l'image d'impression concernée appliquée sur les feuilles (02) respectives sont acquises respectivement avec au moins un système d'acquisition (17) relié à l'unité de commande (16) par technique informatique, dirigé sur la voie de transport des feuilles (02) respectives, caractérisé en ce
    a. que jusqu'au début de l'impression continue de cette machine à imprimer offset à feuilles (01) plusieurs paquets de feuilles (02) composés de différentes quantités de feuilles de rebut et/ou bonnes feuilles sont guidés successivement le long de la voie de transport à travers cette machine à imprimer offset à feuilles (01),
    dans lequel respectivement des feuilles (02) préimprimées avec chacune une image d'impression provenant d'un travail d'impression précédent différente de l'image d'impression dans l'impression en continu de la machine à imprimer offset à feuilles (01) sont utilisées comme feuilles de rebut et respectivement des feuilles (02) non imprimées comme bonnes feuilles, dans lequel au moins les paquets suivants de feuilles (02) sont guidés successivement à travers cette machine à imprimer offset à feuilles (01) :
    a.a. un premier paquet de feuilles (02) constitué de plusieurs feuilles de rebut,
    a.b. un deuxième paquet constitué de plusieurs bonnes feuilles,
    a.c. au moins un troisième paquet de feuilles (02) avec respectivement plusieurs feuilles de rebut et avec respectivement au moins une bonne feuille,
    a.d. dans lequel les feuilles de rebut du premier paquet et les bonnes feuilles du deuxième paquet sont encrées respectivement selon le profil d'encre ne correspondant pas à l'encrage de consigne, sur lequel l'unité de commande (16) se fonde respectivement lors du réglage du profil d'encre du au moins un dispositif d'encrage (04),
    b. que l'unité de commande (16) reconnait les bonnes feuilles du deuxième paquet comme bonnes feuilles suite à une entrée manuelle sur un système de commande utilisateur (19) relié à l'unité de commande (16) par technique informatique ou de manière automatique et une position respective de plusieurs champs de mesure d'encre est établie avec la reconnaissance des bonnes feuilles, dans lequel chaque position de ces champs de mesure d'encre est respectivement disposée dans une des zones d'encre du dispositif d'encrage (04) concerné,
    c. que l'unité de commande (16) à la suite du deuxième paquet de feuilles (02) guidé à travers la machine à imprimer offset à feuilles (01) pour d'autres feuilles (02) guidées à travers la machine à imprimer offset à feuilles (01) acquiert les valeurs de densité d'encre et/ou valeurs colorimétriques respectives de ceux-ci au moyen du système d'acquisition (17) concerné aux positions respectivement établies des champs de mesure d'encre,
    d. que l'unité de commande (16) acquiert avec le système d'acquisition (17) concerné au plus tard avec le début des feuilles (02) du deuxième paquet des feuilles (02) guidées à travers la machine à imprimer offset à feuilles (01) respectivement une image de l'image d'impression appliquée sur les feuilles (02) respectives,
    e. que l'unité de commande (16) avec la reconnaissance des bonnes feuilles du deuxième paquet met en mémoire une image maître, dans lequel l'image maître présente au moins un contour de l'image d'impression à élaborer sur les feuilles (02) lors de l'impression continue de la machine à imprimer offset à feuilles (01),
    f. que l'unité de commande (16) compare les images respectives des feuilles (02) guidées à la suite du deuxième paquet respectivement à travers la machine à imprimer offset à feuilles (01) acquises avec le système d'acquisition (17) concerné respectivement à l'image maître, dans lequel l'unité de commande (16) contrôle ces autres feuilles (02) en vue d'y détecter la présence d'une image d'impression correspondant à l'image maître, dans lequel l'unité de commande (16) évalue la feuille (02) avec une image d'impression correspondant à l'image maître comme une bonne feuille et la feuille (02) avec une image d'impression ne correspondant pas à l'image maître comme une feuille de rebut, dans lequel l'unité de commande (16) ne tient pas compte des feuilles (02) évaluées comme feuilles de rebut lors de la formation du profil d'encre respectif, qui est réglé par l'unité de commande (16) respectivement à la suite du deuxième paquet de feuilles (02) guidé à travers la machine à imprimer offset à feuilles (01),
    g. que l'unité de commande (16) règle en commençant avec les feuilles (02) du troisième paquet le profil d'encre respectif sur le dispositif d'encrage (04) concerné sur la base des valeurs de densité d'encre et/ou valeurs colorimétriques respectives acquises respectivement de bonnes feuilles de manière itérative jusqu'à la concordance avec le profil d'encre respectif valable pour l'encrage de consigne.
  2. Procédé selon la revendication 1, caractérisé en ce que l'unité de commande (16) met en mémoire au moins d'au moins une ou plusieurs bonnes feuilles du deuxième paquet l'image respective de l'image d'impression concernée et l'affiche sur un système d'affichage (23) relié à l'unité de commande (16).
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que l'unité de commande (16) détermine, à partir de plusieurs valeurs de densité d'encre et/ou valeurs colorimétriques acquises respectivement aux mêmes positions des bonnes feuilles respectives du troisième paquet respectivement au moyen du système d'acquisition (17) concerné, respectivement une valeur moyenne et utilise ces valeurs moyennes pour le réglage du profil d'encre respectif.
  4. Procédé selon la revendication 1 ou 2 ou 3, caractérisé en ce que l'image maître est élaborée par l'unité de commande (16) de telle sorte que l'unité de commande (16) diminue la résolution de l'image concernée des bonnes feuilles du deuxième paquet acquise à l'origine donnée par sa quantité de points d'image et utilise la quantité restante de points d'image comme une signature d'image représentant l'image maître, dans lequel l'unité de commande (16) utilise la signature d'image représentant l'image maître pour le contrôle de la présence d'une image d'impression correspondant à cette image maître sur les feuilles (02) guidées après l'élaboration de l'image maître le long de la voie de transport à travers la machine à imprimer offset à feuilles (01).
  5. Procédé selon la revendication 4, caractérisé en ce que pour l'acquisition de l'image respective de l'image d'impression concernée appliquée sur les feuilles (02) respectives un système d'acquisition (17) présentant plusieurs canaux d'encre est utilisé, dans lequel l'unité de commande (16) forme la signature d'image respective de l'image maître séparément pour chaque canal d'encre du système d'acquisition (17) et pour le contrôle de la présence d'une image d'impression correspondant à cette image maître.
  6. Procédé selon la revendication 1 ou 2 ou 3 ou 4 ou 5, caractérisé en ce que l'image maître est formée de l'image respective des bonnes feuilles du deuxième paquet.
  7. Procédé selon la revendication 1 ou 2 ou 3 ou 4 ou 5 ou 6, caractérisé en ce que l'unité de commande (16) après la formation de l'image maître pour les feuilles (02) guidées de manière subséquente à travers cette machine à imprimer offset à feuilles (01) règle un repérage axial et/ou un repérage circonférentiel et/ou un repérage d'encre.
  8. Procédé selon la revendication 1 ou 2 ou 3 ou 4 ou 5 ou 6 ou 7, caractérisé en ce que l'unité de commande (16) règle le profil d'encre respectif, lequel est réglé à la fin du dernier troisième paquet de feuilles (02), sur le dispositif d'encrage (04) concerné comme le profil d'encre valable pour l'impression continue.
  9. Procédé selon la revendication 1 ou 2 ou 3 ou 4 ou 5 ou 6 ou 7 ou 8, caractérisé en ce que 40 à 50 feuilles de rebut sont utilisées pour le premier paquet.
  10. Procédé selon la revendication 1 ou 2 ou 3 ou 4 ou 5 ou 6 ou 7 ou 8 ou 9, caractérisé en ce que respectivement 10 à 15 feuilles (02) sont utilisées pour les troisièmes paquets.
  11. Procédé selon la revendication 1 ou 2 ou 3 ou 4 ou 5 ou 6 ou 7 ou 8 ou 9 ou 10, caractérisé en ce que respectivement une plaque de tôle est ou sont utilisées comme feuilles de rebut et/ou comme bonnes feuilles.
EP20701173.5A 2019-02-05 2020-01-16 Procédé de réglage d'un profil colorimétrique dans une presse offset à feuilles utilisant des feuilles préimprimées de rebut Active EP3921164B1 (fr)

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DE102019102762.4A DE102019102762A1 (de) 2019-02-05 2019-02-05 Verfahren zur Einstellung eines Farbprofils in einer Bogenoffsetdruckmaschine
PCT/EP2020/051012 WO2020160886A1 (fr) 2019-02-05 2020-01-16 Procédé de réglage d'un profil d'encre d'une machine d'impression offset de feuilles au moyen à freuilles de rebut pré-imprimées

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DE3707695A1 (de) 1987-03-11 1988-09-22 Heidelberger Druckmasch Ag Verfahren zur definierten erzeugung einer dem fortdruck nahen farbverteilung im farbwerk von rotationsdruckmaschinen
DE102008029998A1 (de) 2007-07-11 2009-01-15 Manroland Ag Abfördern von Druckfarbe
DE102008041430B4 (de) * 2008-08-21 2011-12-08 Koenig & Bauer Aktiengesellschaft Verfahren zur Prüfung zumindest eines in einem laufenden Druckprozess einer Druckmaschine ermittelten Messwertes auf seine Plausibilität
DE102009000877C5 (de) 2009-02-16 2016-01-07 Koenig & Bauer Ag Verfahren zur Einstellung einer Flächendeckung und ein entsprechendes Verfahren zur Durchführung in einer mehrere Druckwerke aufweisenden Druckmaschine
DE102010003385B4 (de) * 2010-03-29 2023-04-13 Koenig & Bauer Ag Verfahren zum Durchführen eines Auftragswechsels an Bogendruckmaschinen
DE102010003913B4 (de) * 2010-04-13 2019-01-10 Koenig & Bauer Ag Verfahren zum Betreiben von Bogendruckmaschinen und eine Bogendruckmaschine zum Bedrucken von Bogen
DE102013217099A1 (de) * 2012-08-30 2014-03-06 Koenig & Bauer Aktiengesellschaft Verfahren zum Erkennen eines Auftragswechsels in einem Stapel und Verwendung eines zumindest teilweise unbedruckten Bogens zum Erkennen einer Trennstelle zwischen zwei Aufträgen
DE102017202937B4 (de) * 2017-02-23 2019-08-08 Koenig & Bauer Ag Verfahren zur Steuerung einer mit einer Druckmaschine datentechnisch verbundenen Anzeigeeinrichtung

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