EP0323537B1 - Dispositif pour détecter une impression défectueuse - Google Patents

Dispositif pour détecter une impression défectueuse Download PDF

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Publication number
EP0323537B1
EP0323537B1 EP88100103A EP88100103A EP0323537B1 EP 0323537 B1 EP0323537 B1 EP 0323537B1 EP 88100103 A EP88100103 A EP 88100103A EP 88100103 A EP88100103 A EP 88100103A EP 0323537 B1 EP0323537 B1 EP 0323537B1
Authority
EP
European Patent Office
Prior art keywords
image data
printing
intaglio
cylinder
photographing means
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
EP88100103A
Other languages
German (de)
English (en)
Other versions
EP0323537A1 (fr
Inventor
Hiromitsu Komori Printing Mach. Co. Ltd. Ebihara
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.)
Komori Corp
Original Assignee
Komori Corp
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8198628&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0323537(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Komori Corp filed Critical Komori Corp
Priority to EP88100103A priority Critical patent/EP0323537B1/fr
Priority to AT88100103T priority patent/ATE71025T1/de
Priority to DE8888100103T priority patent/DE3867455D1/de
Publication of EP0323537A1 publication Critical patent/EP0323537A1/fr
Application granted granted Critical
Publication of EP0323537B1 publication Critical patent/EP0323537B1/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

Definitions

  • This invention relates to a defective print detecting device for checking the quality of a printed matter at the plate cylinder side, which can be advantageously used especially in an intaglio printing apparatus.
  • Fig. 3 is a diagrammatic view showing schematically a prior art intaglio printing apparatus.
  • paper sheets 3 to be printed are stacked on a pile board 2 of a sheet feeder 1, and extracted sheet by sheet to be fed onto a transporting belt 4.
  • a swing device 5 being swung by a cam mechanism has a gripping claw which grips paper 3 transported on the transporting belt 4 down to its downstream end and carries the paper 3 to the extent of its swing angle.
  • the paper 3 is fed to an impression cylinder 6 through a paper transfer cylinder 7.
  • gripping claws 8 and 9 at positions dividing the outer peripheral surface of the impression cylinder 6 into three sections and a position on the outer peripheral surface of the paper transfer cylinder 7, respectively, which are opposing each other sequentially as the impression cylinder 6 and the paper transfer cylinder 7 rotate.
  • the paper 3 gripped on the swing device 5 is transferred to the gripping claw 8 through the gripping claw 9 and wound around the peripheral surface of the impression cylinder 6.
  • a sprocket 10 is disposed on the paper transfer cylinder 7 in the opposite side of the impression cylinder 6.
  • a delivery chain 13 is hooked up between the sprocket 10 and a sprocket 12 which is disposed in the vicinity of a pile board 15.
  • the delivery chain 13 has a plurality (four in the figure) of gripper devices 14 at constant intervals, and the paper 3 intaglio printed between the impression cylinder 6 and an intaglio cylinder 16 is transferred from the gripping claws 8 to the gripper devices 14 and transported.
  • the pile board 15 is located beneath the downstream end of the delivery chain 13, and receives to stack the paper 3 which, after being transported to the downstream end, is released and dropped from the gripper devices 14.
  • the intaglio cylinder 16 which has the same diameter as the impression cylinder 6, has a plurality (three in the figure) of intaglio printing plates 17, and each of the intaglio printing plates 17 is provided with recessed lines as a pattern to print.
  • the surfaces of the intaglio printing plates 17 on the intaglio cylinder 16 are contacted against peripheral surfaces of a plurality (three in the figure for printing three colors) of pattern rollers 18 having a diameter of about one-third that of the intaglio cylinder 16.
  • On the peripheral surfaces of the pattern rollers 18 are formed reliefs (not shown) corresponding to individual patterns of individual colors, through which the intaglio printing plates 17 are supplied with inks of individual colors in ink fountains 22 through fountain rollers 19.
  • the reliefs are formed larger than the corresponding recessed pattern lines of the intaglio printing plates 17, and parts other than the reliefs are relatively recessed not to contact with the intaglio printing plates 17.
  • a wiping roller 26 rotating in the same direction as the intaglio cylinder 16 and contacting against the intaglio cylinder 16 at a position obliquely beneath the intaglio cylinder 16, that is, at the downstream side of the pattern rollers 18 with respect to the rotational direction of the intaglio cylinder 16.
  • the wiping roller 26 wipes off excessive inks on the surfaces of the intaglio printing plates 17.
  • a wiping tank 28 having a plurality of brushes 29 and filled with a cleaning solution 27 is disposed beneath the wiping roller 26. The cleaning solution 27 accumulated on the wiping roller 26 is scraped off by a doctor blade 30.
  • Such a defective print detecting device comprises a CCD camera, photographing means such as a line sensor, a signal processing circuit to process an electrical signal as an output signal of the photographing means, and a rotary encoder for supplying a reference signal for processing to the signal processing circuit, and compares levels of corresponding positions of image data of the reference printed matter and image data of the printed matter to be checked to determine whether the difference between both levels is within a specified value and evaluate the quality of the print.
  • a defective print detecting device which can detect a defective print exactly and, even when printing with a plurality of printing plates of the same patterns mounted on the plate cylinder, can also detect exactly a defective print regardless of mounting errors of the printing plates.
  • a defective print detecting device for determining quality of prints printed by a printing apparatus, comprising photographing means for photographing condition of surface of a printing plate having a pattern to print mounted on a plate cylinder as an image, a position detecting sensor for detecting rotational position of the plate cylinder, and a signal processing circuit for comparing reference image data of the surface of the printing plate acquired at the beginning of printing using the photographing means with checking image data of the surface of the printing plate acquired during printing using the photographing means according to a signal from the position detecting sensor and determining whether a difference in level between both image data is within a specified range; or comprising photographing means for photographing conditions of surfaces of a plurality of printing plates having individual patterns to print mounted on a plate cylinder as images, a position detecting sensor for detecting rotational position of the plate cylinder, and a signal processing circuit for comparing respective reference image data of the surfaces of the individual printing plates acquired at the beginning of printing using the photographing means with respective
  • quality of prints can be determined from image data representing the condition of the surface of the printing plate.
  • Fig. 1 is a diagrammatic view showing schematically the entire structure of an embodiment of the present invention.
  • Fig. 2 is a detailed block diagram of the embodiment.
  • Fig. 3 is a diagrammatic view showing schematically a prior art intaglio printing apparatus.
  • a CCD camera (hereinafter simply referred to as "camera”) 31 as photographing means is disposed so that its lens faces the surface of an intaglio printing plate 17 at the downstream side of a wiping roller 26 with respect to the rotational direction of an intaglio cylinder 16 in order to photograph the surface after ink is wiped of by the wiping roller 26.
  • a signal processing circuit 32 is to process an electrical signal as an output signal of the camera 31, which will be described in detail herein later.
  • a rotary encoder as a position detecting sensor is connected to a rotary shaft of the intaglio cylinder 16 and supplies the camera 31 and the signal processing circuit 32 with rotational position information of the intaglio cylinder 16.
  • Fig. 2 is a block diagram of this embodiment.
  • the camera 31 comprises an optical system including a lens 34 and a CCD3 which converts an image focused through the optical system to a corresponding electrical signal.
  • the signal processing circuit 32 is the part surrounded by two-dot-bar lines in Fig. 2.
  • This embodiment has No. 1 to No. 3 reference memories 36a, 36b, and 36c corresponding to three intaglio printing plates 17 to store reference image data of the respective intaglio printing plates 17, and No. 1 to No. 3 detection memories 37a, 37b, and 37c to store checking image data for checking the respective intaglio printing plates 17.
  • a memory controller 38 is to control reading data of the reference memories 36a through 36c and the detection memories 37a through 37c.
  • a checking level setting circuit 39 is to set previously an allowable level difference between the reference image data and the checking image data.
  • a comparator 40 is compares the reference image data with the checking image data and, when the level difference between both data exceeds the allowable level difference set to the checking level setting circuit 39, transmits a signal to represent the result.
  • the reference image data and the checking image data corresponding to individual picture elements of the CCD 35 are compared one by one to compare levels of both data corresponding to the individual picture elements and, if there is even one which exceeds the allowable level difference, the comparator 40 outputs a signal.
  • a correction circuit 41 is to adjust the gain of an amplifier 42 according to the rotation speed of the intaglio cylinder 16.
  • a phase signal, an output signal of the rotary encoder 33 consists of a reference signal which rises at every turn of the intaglio cylinder 16 (at the starting position of a first intaglio printing plate 17, that is, a reference position) and a clock pulse which is a pulse signal for data read/write rising at every specified turns of the intaglio cylinder 16, and is supplied to the memory controller 38, the checking level setting circuit 39, the correction circuit 41, and the CCD controller 43.
  • a reference value memory signal is a signal to cause the reference memories 36a to 36c to read the reference image data through the memory controller 38, which is supplied by turning on a switch (not shown).
  • a checking start signal is a signal to start comparison of the reference image data with the checking image data, and is supplied by turning on a switch (not shown).
  • a checking accuracy adjusting signal is a signal to adjust a preset value of the checking level setting circuit 39, that is, the value of allowable level difference.
  • a step signal is an address signal for the reference memories 36a through 36c and the detection memories 37a through 37c.
  • the operator checks visually the condition of printed matter actually printed while performing test printing to determine the quality and, if it is satisfactory, causes the reference value memory signal to be transmitted. After that, when the reference signal representing the reference position is transmitted from the rotary encoder 33, the reference image data from the first intaglio printing plate 17 is written into the first reference memory 36a. The writing is continued until the intaglio cylinder 16 is detected, by the clock pulse of the rotary encoder 33, to be at a position corresponding to a notch. When the starting position of the second intaglio printing plate 17 is detected, writing of the reference image data is re-started to store the reference image data into the second reference memory 36b.
  • the image data of the third intaglio printing plate 17 is stored into the third reference memory 36c.
  • a specified checking process is started by the checking start signal. This process is the same as writing the reference image data, in which, as the intaglio cylinder 16 rotates, the checking image data of the surfaces of respective intaglio printing plates 17 are written into the corresponding first to third detection memories 37a to 37c, and these checking image data are compared with the corresponding reference image data to determine whether the level differences between both image data are within the allowable level difference. Thus, a defective print can be detected, if any.
  • the present invention in which the quality of printed matter is determined by observing the condition of the surface of the printing plate, can provide exact determination of the quality of printing without being affected by conditions of the printed matters at the time of checking such as flapping during transportation, as compared with a case where the quality is determined from printed matters. Further, the present invention can also be applied to a case where a plurality of printing plates are mounted on a single plate cylinder, in which reference image data is compared with checking image data for each printing plate, and therefore the quality of all printed matters can be exactly identified without being affected by mounting conditions of the printing plates on the plate cylinder.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Claims (5)

  1. Dispositif pour détecter une impression défectueuse afin de déterminer la qualité des impressions imprimées par un appareil d'impression, comprenant des moyens de photographie pour photographier l'état de surface d'une plaque d'impression ayant un modèle à imprimer montée sur un cylindre à plaques comme image, un capteur de détection de position pour détecter la position de rotation dudit cylindre à plaques, et un circuit de traitement de signal pour comparer les données d'une image de références de la surface de ladite plaque d'impression acquises au commencement de l'impression utilisant lesdits moyens de photographie avec des données d'une image de vérification de la surface de ladite plaque d'impression acquises pendant l'impression utilisant les moyens de photographie selon un signal provenant dudit capteur de détection de position et déterminant si une différence de niveau entre les deux données d'image est à l'intérieur d'un domaine spécifié.
  2. Dispositif pour détecter une impression défectueuse afin de déterminer la qualité des impressions imprimées par un appareil d'impression, comprenant des moyens de photographie pour photographier les états des surfaces de plusieurs plaques d'impression ayant des modèles individuels à imprimer montées sur un cylindre à plaques (16) comme images, un capteur de détection de position pour détecter la position de rotation dudit cylindre à plaques, et un circuit de traitement de signal pour comparer les données d'image de référence respectives des surfaces desdites plaques d'impression individuelles acquises au commencement de l'impression utilisant lesdits moyens de photographie avec les données d'image de vérification respectives des surfaces desdites plaques d'impression individuelles acquises pendant l'impression utilisant lesdits moyens de photographie selon un signal provenant dudit capteur de détection de position et déterminant si la différence de niveau entre lesdites données d'image est à l'intérieur de domaines spécifiés.
  3. Dispositif pour détecter les impressions défectueuses suivant les revendications 1 ou 2, dans lequel ledit appareil d'impression est un appareil d'impression en creux.
  4. Dispositif pour détecter des impressions défectueuses suivant la revendication 3, dans lequel lesdits moyens de photographie (31) photographient les surfaces des plaques d'impression en creux du côté aval d'un rouleau d'essuyage par rapport à la direction de rotation d'un cylindre d'impression en creux.
  5. Dispositif pour détecter des impressions défectueuses suivant la revendication 3, dans lequel ledit capteur de détection de position comprend un codeur rotatif connecté à un arbre rotatif d'un cylindre d'impression en creux, et lesdites données d'image de référence et lesdites données d'images de vérification sont écrites dans des mémoires à partir d'un instant où un signal de référence représentant une position de référence est transmis par ledit codeur rotatif jusqu'à ce que ledit cylindre d'impression en creux soit détecté dans une position correspondant à une encoche sur ledit cylindre d'impression en creux au moyen d'impulsions d'horloge dudit codeur rotatif.
EP88100103A 1988-01-07 1988-01-07 Dispositif pour détecter une impression défectueuse Expired - Lifetime EP0323537B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP88100103A EP0323537B1 (fr) 1988-01-07 1988-01-07 Dispositif pour détecter une impression défectueuse
AT88100103T ATE71025T1 (de) 1988-01-07 1988-01-07 Vorrichtung zum detektieren von fehlerhaften exemplaren.
DE8888100103T DE3867455D1 (de) 1988-01-07 1988-01-07 Vorrichtung zum detektieren von fehlerhaften exemplaren.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP88100103A EP0323537B1 (fr) 1988-01-07 1988-01-07 Dispositif pour détecter une impression défectueuse

Publications (2)

Publication Number Publication Date
EP0323537A1 EP0323537A1 (fr) 1989-07-12
EP0323537B1 true EP0323537B1 (fr) 1992-01-02

Family

ID=8198628

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88100103A Expired - Lifetime EP0323537B1 (fr) 1988-01-07 1988-01-07 Dispositif pour détecter une impression défectueuse

Country Status (3)

Country Link
EP (1) EP0323537B1 (fr)
AT (1) ATE71025T1 (fr)
DE (1) DE3867455D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102179993A (zh) * 2011-03-28 2011-09-14 东莞东运机械制造有限公司 一种新型自动凹样机

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL106406A (en) * 1993-07-20 1997-03-18 Scitex Corp Ltd And Advanced V Automatic inspection of printing plates or cylinders
DE4413736C2 (de) * 1994-04-20 1997-12-18 Heidelberger Druckmasch Ag Verfahren zur Kontrolle der Abnutzung einer Druckform in einer Druckmaschine
DE4413731C2 (de) * 1994-04-20 1998-07-02 Heidelberger Druckmasch Ag Verfahren zur Steuerung der Temperatur der Druckfarbe in einer Druckmaschine
DE29507302U1 (de) * 1995-05-05 1995-06-22 Roland Man Druckmasch Rotationsdruckmaschine
EP2399745A1 (fr) 2010-06-25 2011-12-28 KBA-NotaSys SA Système d'inspection pour l'inspection en ligne de documents imprimés produits sur une presse d'impression de rotogravure
WO2012063206A2 (fr) * 2010-11-11 2012-05-18 Elbit Vision Systems (Evs) Ltd. Système de prévention des anomalies et procédé pour machines à touffeter
EP2722179A1 (fr) * 2012-10-18 2014-04-23 KBA-NotaSys SA Presse d'impression en héliogravure et procédé de surveillance de fonctionnement de celle-ci
IT202100007112A1 (it) * 2021-03-24 2022-09-24 Parvis Systems And Services S P A Sistema ottico di ispezione
CN115684186B (zh) * 2022-10-26 2023-08-25 青岛万美高科制版有限公司 一种检查凹版印刷机印刷辊筒体表面缺陷装置

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH282748A (de) * 1950-07-06 1952-05-15 E Herzer Alfred Verfahren zur photoelektrischen Bestimmung von Intensitätsabweichungen der Druckfarbe an einer Tiefdruckmaschine, und Einrichtung zur Durchführung des Verfahrens.
US4210078A (en) * 1974-06-24 1980-07-01 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Apparatus for use on printing presses to insure optimum color density and to assist in making corrective adjustment

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102179993A (zh) * 2011-03-28 2011-09-14 东莞东运机械制造有限公司 一种新型自动凹样机
CN102179993B (zh) * 2011-03-28 2013-02-20 广东东运科技印刷设备有限公司 一种新型自动凹样机

Also Published As

Publication number Publication date
ATE71025T1 (de) 1992-01-15
EP0323537A1 (fr) 1989-07-12
DE3867455D1 (de) 1992-02-13

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