EP1961569A1 - Dispositif et procédé de réglage pour machine d'impression rotative - Google Patents

Dispositif et procédé de réglage pour machine d'impression rotative Download PDF

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Publication number
EP1961569A1
EP1961569A1 EP08002943A EP08002943A EP1961569A1 EP 1961569 A1 EP1961569 A1 EP 1961569A1 EP 08002943 A EP08002943 A EP 08002943A EP 08002943 A EP08002943 A EP 08002943A EP 1961569 A1 EP1961569 A1 EP 1961569A1
Authority
EP
European Patent Office
Prior art keywords
printing
unit
printing unit
images
printed
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Withdrawn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
EP08002943A
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English (en)
French (fr)
Inventor
Roger Roch
Benoit Rosset
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.)
Bobst Mex SA
Original Assignee
Bobst SA
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 Bobst SA filed Critical Bobst SA
Priority to EP08002943A priority Critical patent/EP1961569A1/de
Publication of EP1961569A1 publication Critical patent/EP1961569A1/de
Withdrawn legal-status Critical Current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
    • B41F33/0036—Devices for scanning or checking the printed matter for quality control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F5/00—Rotary letterpress machines
    • B41F5/24—Rotary letterpress machines for flexographic printing

Definitions

  • the present invention relates to a device for adjusting the position of a printing unit with respect to a printing tape in a rotary printing machine comprising means for adjusting the position of said printing unit with respect to said printing tape.
  • the invention also relates to a method of adjusting the position of a printing unit relative to a printing tape in a rotary printing machine.
  • the invention relates to a rotary printing machine comprising at least one printing unit capable of transferring ink onto a printing tape for printing formats and comprising means for adjusting the position of said printing unit with respect to said printing unit. print tape.
  • a rotary printing machine generally comprises at least one printing unit corresponding to a back-pressure cylinder on which a printing tape is based.
  • the printing unit is generally formed by an assembly comprising a screen roll (or anilox) and a forme cylinder (or impression cylinder).
  • the search for the print quality of the formats is done by optimizing the adjustment of the relative position of the various cylinders participating in the printing process.
  • the image obtained by the complete revolution of the forme cylinder on the printing tape is called format.
  • Adjustment devices are known in which the position of a printing unit with respect to a printing tape is automatically adjusted by the closed-loop analysis of the images of the formats taken by a vision system, see for example the application patent DE 4413735 A .
  • the image of the format printed on the printing tape is transferred to a control unit which compares in real time and continuously to a reference image (or target image).
  • a control unit modifies the position of the printing unit with respect to the printing tape.
  • This setting is dynamic, that is, the position of the printer group can change automatically during production, depending on the images taken by the vision system. If such a device makes it possible to correct in real time and continuously any drift of printed formats during production, it is not at all adapted to the setting of the rotary printing machine before the launch of production, also called preset or prepositioning.
  • the rotary printing machine Before starting a print job, the rotary printing machine must be preset. This presetting consists in putting the printer unit in contact with the printing tape and advancing it in successive steps towards the backpressure cylinder while the tape is running. At the same time, printed formats are controlled by suitable means. When the print quality of the sizes reaches the required level, the printer group feed is stopped, the preset is completed. The printing unit is then in a position called optimal, denoted P opt .
  • the position of the printing unit is slaved to the vision system so that to go from a position P i to a successive position P i + 1 , it is necessary to wait for the format printed by the printing unit in the position P i passes in front of the vision system.
  • the length of tape that then passed is equal to L + D, where L represents the length of a format and D the distance that separates the vision system from the printing group, L and D being expressed in meters.
  • L represents the length of a format and D the distance that separates the vision system from the printing group
  • L and D being expressed in meters.
  • the tape running through the machine while the printing unit is advancing to the optimum position is lost tape, also known as a strike.
  • the waste being a loss of material, it generates an additional cost of production.
  • the strike is proportional to the distance separating the vision system from the printing unit, on the one hand, and the length of the printed format, on the other hand, which is not satisfactory.
  • An object of the present invention is to overcome the aforementioned drawbacks by providing a setting device that limits the waste during the presetting of a rotary printing machine.
  • the subject of the present invention is an adjusting device according to claim 1.
  • the position of the printing unit is not slaved to the vision system. Thanks to this new design, the waste is not proportional to the distance between the vision system and the printing unit, but only to the length of the printed format, which considerably reduces the waste.
  • the Figure 1 illustrates an online flexographic printing machine.
  • the printing unit 6 comprises a screen cylinder (or anilox) 1 and a plate cylinder 2.
  • the screen cylinder 1 is in contact with the plate cylinder 2 to ensure sufficient inking of the plate.
  • the prepositioning of the screen roll 1 with respect to the forme cylinder 2 not forming part of the invention, it will not be described here.
  • the forme cylinder 2 of the printing unit 6 is in contact with a printing band 10 which bears against a backpressure cylinder 3.
  • a camera 4 is placed downstream of the printing unit 6 in order to capture images. printed formats on the printing tape 10.
  • the contacting of the forme cylinder 2 with the printing tape 10 is a preliminary step to the adjusting operation according to the invention, this preliminary step is performed without rotating the printing machine, that is, without scroll the print band.
  • the contact pressure of the forme cylinder 2 on the backpressure cylinder 3 is chosen sufficient so that ink is transferred onto the printing tape 10 but not excessive to avoid damage to the plate.
  • the presetting of the rotary printing machine is carried out in two phases.
  • a control unit 7 controls the displacement of the printing unit 6 from a predefined initial position P i to a final position P f predefined by successive steps T, while the printing band 10 runs in the machine, the direction of travel is illustrated by the arrow 5.
  • the initial position P i corresponds to the position of the printing unit 6 at the end of the preliminary step.
  • the final position P f is defined by the choice of the pitch T, on the one hand, and by the total number of movement steps of the printing unit, on the other hand.
  • the pitch is 10 ⁇ m and the total number of movements of the printing unit from position P i is equal 9, thus, the final position P f is at 90 ⁇ m from the initial position P i .
  • 10 formats will be printed on the print tape after the first phase (see Figure 3 ).
  • N number of printed formats for each position of the printing group it is 10 ⁇ N formats that will be printed on the print tape at the end of the first phase.
  • the camera 4 captures images of the 10 ⁇ N F formats printed on the printing tape 10 during the first phase and transmits them to a calculation unit 8 to be evaluated.
  • the purpose of the evaluation is to determine the optimal position P opt , that is to say the position of the printing unit 6 for which the print quality of the formats F reaches the required level.
  • the position P opt corresponds to the position from which the images of the printed formats F are identical.
  • the unit 8 calculates the surface of the 10 ⁇ N printed formats F covered by ink. To do this, the unit 8 calculates the number of pixels of each image whose gray level is different from the blank print tape. At the end of the second phase, the computing unit 8 stores the position of the image from which the number of pixels no longer varies, in other words, the position from which the surface covered by ink becomes constant, this position corresponds to the optimum position P opt sought.
  • the optimum position P opt is also the first position for which the transfer of the ink reaches a maximum.
  • the unit 8 calculates the gray level of each pixel composing the 10 ⁇ N images. To do this, the unit 8 compares the gray level of each pixel of a given image with the gray level of the same pixel of the previous image. At the end of the second phase, the computing unit 8 stores the position of the image from which the gray level no longer varies, that is, the position from which the gray level becomes constant, this position corresponds to the optimal position P opt sought.
  • the first phase of the presetting of the printing machine is independent of the second phase.
  • This characteristic of the invention makes it possible to carry out a pre-adjustment which is faster and with less waste than the known adjustment devices. Indeed, in an adjustment device according to the invention, the position of the printing unit 6 is not locked to the camera 4 so that to go from a position P i to a successive position P i + 1 , it is It is not necessary to wait for the format F i printed by the printing unit in the position P i to pass in front of the camera 4.
  • the length of tape that passes through the printing machine is equal to (nx L) + D meters, where n is the total number of steps in advance of the group printer 6, L the length of a format and D the distance between the camera 4 and the printer group 6.
  • the distance D is that which separates the points A and B.
  • the length of the band that passes through the printing machine during the presetting is not proportional to the distance that separates the camera 4 from the printing unit 6 but only to the length of the printed format, which greatly reduces the waste.
  • the Figure 2 illustrates a flexographic printing machine with a central drum.
  • the description made in relation to the Figure 1 also being valid for the Figure 2 it will not be repeated here.
  • the distance D which separates the points A and B in the machine from the Figure 1 must be measured along a line while in the machine the Figure 2 it must be measured along a curve.
  • the optimum position P opt memorized by the calculation unit 8 is transmitted to the control unit 7 to control the displacement of the printing unit 6 from the final position P f to the optimum position P opt at the end of the second phase.
  • This variant embodiment is represented by a dotted arrow on the Figures 1 and 2 .
  • the Figure 3 is a graph which illustrates by an example, in connection with the first evaluation mode, the evolution of the surface of the printed formats covered by ink as a function of the advance of the printing unit.
  • the abscissa axis is expressed in micrometer
  • the ordinate axis is expressed as a percentage of the area of the printed formats covered by ink relative to the total area of said printed formats. Except for flat areas, only a part of a given format is covered by ink, the other part remains blank, therefore, the total area of the printed formats is the sum of the areas of inked parts and blank parts .
  • the Figure 4 shows a print band 10 at the end of the first phase.
  • 10 length formats L have been printed, one format per position of the printing unit 6.
  • F i the format printed by the printing unit in the position P i
  • F i + 1 the format printed by the printing group in the next position P i + 1 and so on.
  • P opt P i + 8 .
  • the waste is reduced by more than 80%.
  • the invention also makes it possible to reduce the presetting time by more than 80%.
EP08002943A 2007-02-21 2008-02-18 Dispositif et procédé de réglage pour machine d'impression rotative Withdrawn EP1961569A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08002943A EP1961569A1 (de) 2007-02-21 2008-02-18 Dispositif et procédé de réglage pour machine d'impression rotative

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP07003537 2007-02-21
EP08002943A EP1961569A1 (de) 2007-02-21 2008-02-18 Dispositif et procédé de réglage pour machine d'impression rotative

Publications (1)

Publication Number Publication Date
EP1961569A1 true EP1961569A1 (de) 2008-08-27

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EP08002943A Withdrawn EP1961569A1 (de) 2007-02-21 2008-02-18 Dispositif et procédé de réglage pour machine d'impression rotative

Country Status (3)

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US (1) US20080196610A1 (de)
EP (1) EP1961569A1 (de)
BR (1) BRPI0800186A2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2127876A1 (de) * 2008-05-26 2009-12-02 BST International GmbH Verfahren und Vorrichtung zum Einstellen eines von einer Rotationsdruckmaschine erzeugten Druckbildes
WO2015117806A1 (de) * 2014-02-05 2015-08-13 CONPRINTA GmbH & Co. KG Druckwerk für eine flexodruckmaschine und verfahren zu dessen betrieb

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8931410B2 (en) * 2006-01-25 2015-01-13 Advanced Vision Technology (Avt) Ltd. System and method for setting up a printing press

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4413735A1 (de) 1994-04-20 1995-10-26 Heidelberger Druckmasch Ag Verfahren zum Steuern oder Regeln der Rasterpunktgröße beim Drucken auf einen Bedruckstoff
EP1132203A1 (de) * 2000-02-10 2001-09-12 Bobst S.A. Verfahren und Vorrichtung zum automatischen Voreinstellen des Registers von Rotationsdruckmaschinen
WO2004048093A2 (de) * 2002-11-22 2004-06-10 Windmöller & Hölscher Kg Vorregistereinstellung

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US4798199A (en) * 1984-02-13 1989-01-17 Tecnol, Inc. Arterial wrist support
US5230699A (en) * 1992-02-18 1993-07-27 Grasinger John E Phalanx splint
US6109722A (en) * 1997-11-17 2000-08-29 Hewlett-Packard Company Ink jet printing system with pen alignment and method
US6347856B1 (en) * 1999-03-05 2002-02-19 Hewlett-Packard Company Test pattern implementation for ink-jet printhead alignment
US6575925B1 (en) * 2000-05-18 2003-06-10 Apothecary Products, Inc. Finger splint
DE20122584U1 (de) * 2001-03-27 2006-07-27 Windmöller & Hölscher Kg Einheit zur Einstellung des Druckbildes in einer Rotationsdruckmaschine
US6692452B2 (en) * 2002-01-11 2004-02-17 James C. Y. Chow Finger splint for treating mallet finger condition
EP1839854A1 (de) * 2006-03-31 2007-10-03 ELTROMAT GmbH Verfahren und Vorrichtung zur optimalen Einstellung der Beistellung in einer mehrere Druckwerke aufweisende Rotations-Flexodruckmaschine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4413735A1 (de) 1994-04-20 1995-10-26 Heidelberger Druckmasch Ag Verfahren zum Steuern oder Regeln der Rasterpunktgröße beim Drucken auf einen Bedruckstoff
EP1132203A1 (de) * 2000-02-10 2001-09-12 Bobst S.A. Verfahren und Vorrichtung zum automatischen Voreinstellen des Registers von Rotationsdruckmaschinen
WO2004048093A2 (de) * 2002-11-22 2004-06-10 Windmöller & Hölscher Kg Vorregistereinstellung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2127876A1 (de) * 2008-05-26 2009-12-02 BST International GmbH Verfahren und Vorrichtung zum Einstellen eines von einer Rotationsdruckmaschine erzeugten Druckbildes
WO2015117806A1 (de) * 2014-02-05 2015-08-13 CONPRINTA GmbH & Co. KG Druckwerk für eine flexodruckmaschine und verfahren zu dessen betrieb

Also Published As

Publication number Publication date
BRPI0800186A2 (pt) 2009-06-02
US20080196610A1 (en) 2008-08-21

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