EP0554811B1 - Dispositif de détection d'erreurs d'impression dans une machine à imprimer rotative - Google Patents

Dispositif de détection d'erreurs d'impression dans une machine à imprimer rotative Download PDF

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Publication number
EP0554811B1
EP0554811B1 EP93101466A EP93101466A EP0554811B1 EP 0554811 B1 EP0554811 B1 EP 0554811B1 EP 93101466 A EP93101466 A EP 93101466A EP 93101466 A EP93101466 A EP 93101466A EP 0554811 B1 EP0554811 B1 EP 0554811B1
Authority
EP
European Patent Office
Prior art keywords
camera
image
print
electronic
fact
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.)
Expired - Lifetime
Application number
EP93101466A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0554811A1 (fr
Inventor
Roger-Henri Roch
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
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Filing date
Publication date
Application filed by Bobst SA filed Critical Bobst SA
Publication of EP0554811A1 publication Critical patent/EP0554811A1/fr
Application granted granted Critical
Publication of EP0554811B1 publication Critical patent/EP0554811B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the present invention relates to a device for detecting printing or other errors in a printing machine as used in the printing of packaging or printed newspapers.
  • devices which include a camera associated with a flash placed above the moving strip or sheet at the print output of one or more color stations, this camera being capable of sample four to five areas of interest per second with an image resolution of 512 x 512 dots. It is obvious that by changing the focal length of the camera lens, the field of vision, therefore the analysis area, can be changed from 25 x 25 mm to 40 x 40 cm, which translates, for a still image, with maximum detection of a spot of 5/100 mm and 2 mm in diameter respectively. However, given the high speed of the tape running on the order of 10 meters per second, such cameras can let up to 1.5 meters of unexplored tape before the next flash fires.
  • an analysis of potential printing errors reveals two distinct types of errors: a first type of fugitive and too large errors requiring that the printing carried out be subsequently removed from the waste chain; and a second type of lasting error which remains temporarily, at the beginning, within the tolerance limit but which is the warning of a deterioration in progress.
  • a first type of fugitive and too large errors requiring that the printing carried out be subsequently removed from the waste chain
  • a second type of lasting error which remains temporarily, at the beginning, within the tolerance limit but which is the warning of a deterioration in progress.
  • causes of error of the first type one can cite major defects in cardboard or of paper, an absence, a surplus or a projection of ink, oil stains coming from a part of the machine, a cliché getting rid of the cylinder, even even a disturbance of the electric shaft stalling several clichés of colors one to another.
  • the second type of error is frequently due to progressive wear of several parts of the rotary printing machine such as, traditionally, the ink scraper
  • the object of this invention is to solve the aforementioned problems by means of a device capable of rapidly detecting and analyzing all printing errors for appropriate correction.
  • a device comprising at least a first video camera for capturing, according to a first resolution, an image of a sample area of an impression on a moving strip because it is associated upstream with a second camera for capturing the overall impression at a second resolution lower than the first, these two cameras being connected to an electronic and computer device for scanning respective images and then comparison with pre-recorded reference images, the comparative results from the second camera being used in the feedback loop of the operation control of the first camera.
  • the second low resolution camera with global reading comprises a plurality of rows of photosensitive elements placed side by side, the electric charges generated in the first row by reading a transverse strip of the printing being successively transferred to the following rows in synchronism with the running of the strip in order to integrate the additional charges generated, in each respective following row, by the reading followed by this strip.
  • a transverse print strip is successively read in 16 or 64 rows, which increases the contrast and therefore the resolution of the extracted video image.
  • the technology of this type of camera can evolve, and therefore the number of rows as well.
  • this camera can include up to 2,000 photosensitive elements per row, and that its charge integration time for a row can be set at a value less than 100 micro-seconds, the image obtained by this second camera may have a resolution of the order of mm2 of printing.
  • the overall image from the second low resolution camera can allow the definition, by electronic and computer means, of the unprinted or printed areas of uniform color, areas which do not are then more systematically monitored by the first high resolution camera controlled by these same electronic and computer means.
  • electronic and computer means can move, automatically or under the control of an operator, the first high resolution camera transversely with respect to the running of the strip to read with greater precision an area comprising a gross error detected by the second low resolution camera.
  • electronic and computer means can modify the triggering of the flash illuminating the area read by the first high resolution camera as a function of instantaneous changes in the position of the print due to temporary variations in tension within the strip such as detected by the second low resolution camera.
  • the device comprises a first color camera 34 called “CCD” provided with a lens 30 with variable focal length which projects an analysis zone 16 onto the 'element of CCD 38 matrix reading comprising, for example, three matrices of 512 x 512 nested photosensitive dots: one matrix for each fundamental red, green and blue color.
  • This camera is connected to a unit 39 for digitizing the video signal, which digitized signal is sent to a memory area of a processor 50 for subsequent analyzes and comparisons.
  • the camera 34 is mounted movable in translation along a width, its position being able to be modified at will, for example by a motor 35 driving a worm passing through a nut of the housing of the camera.
  • the reading area 16 read by the camera 34 is lit only when shots are taken by a flash 32 providing a momentary high light energy.
  • the device further comprises a second camera 24 called “TDI”, that is to say with synchronous integration transfer with the movement of the strip or of the sheets.
  • This camera 24, provided with a lens 20, is preferably mounted, upstream of the camera 34 with respect to the movement of the strip 10.
  • Its reading unit 28 comprises 8, 16 or 64 rows of 2,000 photosensitive elements. The particularity of this camera 24 is that it works continuously under the permanent lighting of one or more spotlights 22.
  • this camera is synchronized through a controller circuit 29 with the speed of travel of the strip 10 so that during its movement, a transverse strip 14 is read a first time very quickly by the first row of photosensitive elements, then, following, on the one hand, a slight movement to the right due to the scrolling of the tape and, on the other hand, the transfer of the first data from the first row to the second row neighboring, this same strip is read again by this second row and so on, so that, in the last row, a video line is obtained which is sufficiently contrasted to be representative of the image in strip 14.
  • the strip Next printout was also read by the previous rows after immediate reset.
  • the successive video lines of the last row are, after pre-amplification and digitization in the circuit 29, also sent to a memory of the processor 50.
  • the processor 50 can display on the display screen 52 the overall image of the print 12 as seen by the camera 24 and, at the option of the operator expressed on the keyboard 54, make the comparison with a pre image - registered reference. Any difference between these two images reflecting the existence of a gross error can be automatically detected by the processor 50 or visually identified by the operator.
  • the operator can display on the display screen 52 the image of an area of interest to be monitored 16 as seen by the CCD camera 34, which image can also be compared with the corresponding image. of pre-recorded reference to immediately reveal fine errors.
  • this device can remote control the motor 35 to move the CCD camera 34 and synchronize the flash 32 in order to position the reading area at high resolution. 16 on the previously detected anomaly. The operator is then able to decide if this difference actually constitutes a printing error and can in the majority of cases determine the cause from experience. This possibility is all the more interesting since the operator will have, during the start-up phase of the rotary machine, excluded from the surveillance, a priori by the CCD high-resolution reading camera, areas of lesser interest. as seen from the first images taken by the TDI coarse reading camera.
  • the device according to the invention proves to be particularly effective in that it allows the simultaneous detection of gross errors and fine printing errors, and this of a particularly effective because of the repercussions of the analysis of the overall image on the optimization of fine readings.
  • this detection is carried out in particularly short times due to the speed of reading of the cameras and processing by the processor.

Landscapes

  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Handling Of Sheets (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
  • Image Processing (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Control Of Electric Motors In General (AREA)
EP93101466A 1992-02-07 1993-01-30 Dispositif de détection d'erreurs d'impression dans une machine à imprimer rotative Expired - Lifetime EP0554811B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH357/92 1992-02-07
CH00357/92A CH687138A5 (fr) 1992-02-07 1992-02-07 Dispositif de détection d'erreurs d'impression dans une machine à imprimer rotative.

Publications (2)

Publication Number Publication Date
EP0554811A1 EP0554811A1 (fr) 1993-08-11
EP0554811B1 true EP0554811B1 (fr) 1995-06-21

Family

ID=4185177

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93101466A Expired - Lifetime EP0554811B1 (fr) 1992-02-07 1993-01-30 Dispositif de détection d'erreurs d'impression dans une machine à imprimer rotative

Country Status (9)

Country Link
EP (1) EP0554811B1 (da)
JP (1) JPH05269978A (da)
AT (1) ATE123997T1 (da)
BR (1) BR9300498A (da)
CA (1) CA2088816C (da)
CH (1) CH687138A5 (da)
DE (1) DE69300199T2 (da)
DK (1) DK0554811T3 (da)
ES (1) ES2073309T3 (da)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640023B4 (de) * 1996-06-26 2006-06-29 Mahlo Gmbh & Co Kg Verfahren zur Verzugskorrektur
DE102016107272A1 (de) 2016-04-20 2017-10-26 Beckhoff Automation Gmbh Konzept zum Prüfen eines Objekts

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI95888C (fi) * 1993-04-26 1996-04-10 Valtion Teknillinen Menetelmä painatuksen laadun valvomiseksi
DE4432371B4 (de) * 1994-09-12 2004-12-09 Heidelberger Druckmaschinen Ag Verfahren zum Drucken und Weiterverarbeiten von Nutzen
DE29507303U1 (de) * 1995-05-05 1995-06-22 MAN Roland Druckmaschinen AG, 63075 Offenbach Rotationsdruckmaschine mit einer Videokamera
DE19613083A1 (de) 1996-04-02 1997-10-09 Koenig & Bauer Albert Ag Verfahren zur qualitativen Beurteilung von bearbeitetem Material
DE69622848D1 (de) * 1996-05-30 2002-09-12 Eikon Grafiche Srl Vorrichtung und Verfahren zur Überprüfung von Druckbogen
EP0816554B1 (de) * 1996-06-26 2003-04-02 Mahlo GmbH & Co. KG Verfahren zur Verzugskorrektur
US5809894A (en) * 1997-02-20 1998-09-22 Advanced Vision Technology, Ltd. System and method for registration control on-press during press set-up and printing
DE29804960U1 (de) * 1998-03-20 1999-01-07 Günther Louda GmbH, 82041 Oberhaching Vorrichtung zum Kontrollieren von Bögen
FR2807705B1 (fr) * 2000-04-18 2002-12-13 Atel As Ensemble et procede d'impression sur un substrat plat
DE10319771B4 (de) 2003-05-02 2005-03-17 Koenig & Bauer Ag System zur Inspektion eines Druckbildes
DE102005004972A1 (de) * 2005-02-03 2006-08-10 Windmöller & Hölscher Kg Registerverfahren
DE102005018855B4 (de) * 2005-04-22 2010-01-28 Theta System Elektronik Gmbh Vorrichtung zur Inspektion von Druckererzeugnissen
CN100421935C (zh) * 2005-09-12 2008-10-01 浙江华泰丝绸有限公司 纺织印染筛网网版质量检测系统及检测方法
DE602008004195D1 (de) 2007-09-21 2011-02-10 Bobst Sa Verfahren zum Bestimmen der Oberflächengüte eines Trägers und zugehörige Maschine zur Transformation des Trägers
DE202010008084U1 (de) * 2010-07-15 2011-10-21 Eltromat Gmbh Vorrichtung zur Überwachung des Druckergebnisses bei Rotationsdruckmaschinen
FI20106053A0 (fi) * 2010-10-13 2010-10-13 Metso Automation Oy Järjestelmä rainan tarkkailemiseksi ja vastaava menetelmä rainan tarkkailemiseksi
EP3072287A1 (en) * 2013-11-22 2016-09-28 Hewlett-Packard Indigo B.V. Printer with two scanners
FI128735B (en) * 2016-05-06 2020-11-13 Procemex Oy Ltd Procedure and system for computer vision
CN108215464A (zh) * 2017-12-19 2018-06-29 广东北玻臻兴玻璃技术工业有限公司 一种全自动玻璃印刷装置
DE102019109791A1 (de) * 2019-04-12 2020-10-15 Stephan Krebs Vorrichtung zur Druckbildkontrolle für eine Druck- oder Konfektioniermaschine und Verfahren zur Validierung von Inspektionsalgorithmen einer Vorrichtung zur Druckbildkontrolle
DE102024122403A1 (de) * 2024-08-06 2026-02-12 Bundesdruckerei Gmbh Prüfvorrichtung und Prüfverfahren für ein farbiges Druckbild eines als Rolle bereitgestellten Bedruckstoffs

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0127831B1 (en) * 1983-06-02 1990-03-14 Web Printing Controls Co. Closed loop register control
JPS62223605A (ja) * 1986-03-25 1987-10-01 Mutoh Ind Ltd プリント基板等の穴情報生成方法
JPS6391253A (ja) * 1986-10-03 1988-04-21 Sumitomo Heavy Ind Ltd オフセツト印刷機の見当合せ方法及びその装置
FI78025C (fi) * 1987-08-31 1989-06-12 Valtion Teknillinen Foerfarande foer kvalitetskontroll av tryckning.

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19640023B4 (de) * 1996-06-26 2006-06-29 Mahlo Gmbh & Co Kg Verfahren zur Verzugskorrektur
DE102016107272A1 (de) 2016-04-20 2017-10-26 Beckhoff Automation Gmbh Konzept zum Prüfen eines Objekts

Also Published As

Publication number Publication date
CH687138A5 (fr) 1996-09-30
DE69300199D1 (de) 1995-07-27
BR9300498A (pt) 1993-08-10
DK0554811T3 (da) 1995-09-04
EP0554811A1 (fr) 1993-08-11
ATE123997T1 (de) 1995-07-15
JPH05269978A (ja) 1993-10-19
CA2088816C (en) 2000-03-28
DE69300199T2 (de) 1995-11-30
ES2073309T3 (es) 1995-08-01
CA2088816A1 (en) 1993-08-08

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