EP1219420A1 - Vorrichtung zur Abtastung von Registermarken in einer Mehrfarbendruckmaschine - Google Patents

Vorrichtung zur Abtastung von Registermarken in einer Mehrfarbendruckmaschine Download PDF

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Publication number
EP1219420A1
EP1219420A1 EP01128209A EP01128209A EP1219420A1 EP 1219420 A1 EP1219420 A1 EP 1219420A1 EP 01128209 A EP01128209 A EP 01128209A EP 01128209 A EP01128209 A EP 01128209A EP 1219420 A1 EP1219420 A1 EP 1219420A1
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EP
European Patent Office
Prior art keywords
lighting
registration marks
support
color
marks
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.)
Granted
Application number
EP01128209A
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English (en)
French (fr)
Other versions
EP1219420B1 (de
Inventor
Francis Pilloud
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
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Bobst SA
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Publication date
Application filed by Bobst SA filed Critical Bobst SA
Publication of EP1219420A1 publication Critical patent/EP1219420A1/de
Application granted granted Critical
Publication of EP1219420B1 publication Critical patent/EP1219420B1/de
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
    • B41F33/0081—Devices for scanning register marks

Definitions

  • the present invention relates to a device for reading registration marks in a full color printing machine working a material in strip or in sheets.
  • This material, or print medium usually has an area for printing the image and an area printing reserved for quality control signs, usually signs known as registration or register marks, with reference to the tracking of the different colors of the print.
  • Such machines indeed have several groups printers placed one after the other; each printing on the support, using an engraved cylinder or a plate cylinder for example, the same pattern in a different color.
  • the control of the location of these prints is done by means of marking marks printed on each cylinder in the area reserved for quality control signs, i.e. generally in the margin of the support worked. Thanks to a reading, these marks make it possible to determine the tracking error of each color compared to the color of the first printing unit taken generally as a reference.
  • an order of correction is then generated and acts either on the way to the print medium, either on the position of the corresponding printing cylinders.
  • Certain devices allow to take an image of a whole group of brands to using a CCD type video camera, then subjecting this image to a analog-to-digital conversion, to center this scanned image on a analysis window and determine deviations from brands of references.
  • a white light source ensures sufficient lighting of the support filmed by the video camera. This light source can come from a strobe which, thanks to its repeated flashes, makes it possible to take images of the high-speed scrolling support.
  • the lighting of these marks becomes an increasingly significant component, especially when these marks can no longer be made visible by a light source single, white or monochrome. Indeed, depending on the shade of the brands printed, they may, under such lighting, not be sufficiently contrasting and appear invisible or, on the contrary, pose glare or reflection problems in the presence of colors specular such as gilding for example.
  • the colors printed are not so frank of each other and require specific lighting in order to improve the perceived contrast either between them or in relation to the color of background of the printed motif. So a brand with a predominance of green, purple or orange will appear all the more contrasting as its color lighting is rich in complementary color, respectively in red, in yellow or blue in these cases.
  • the first phase consists in finding the initially unknown positions of each registration marks. This task can be greatly facilitated if the brands in question are each made visible by a source of adequate color light. Similarly, when these brands parade at significant speeds of up to 20 m / s, it is easy to understand that it is also advantageous, even necessary, that these marks can be unequivocally perceived.
  • the object of the present invention is to overcome these drawbacks by offering a compact reading device allowing, with a minimum of one read head, to simultaneously detect several registration marks that the latter would each require a reading device with a particular lighting to present sufficient contrast necessary for their detection.
  • the device according to the invention thus brings the advantage of being able detect discrepancies between prints of each color after reading simultaneous of a reference mark and one or more marks of identification by a single read head.
  • the registration marks are scanned by photosensitive elements and read by sweeping into a multitude of fine independent sections which, arranged successively one after the other, reconstitute in the form of striped images the images of the brands read.
  • Source modulation lighting provides an alternation of colors and / or intensity allowing to obtain a cycle of successive color lighting line by line during the image scanning, or group of lines by group of lines, or even image by picture.
  • the simultaneous, or almost simultaneous, reading of these marks by this device does not depend on the shape of these marks, their size or their arrangement relative to each other.
  • the detection of brands of low-contrast concentric markings can be read simultaneously without difficulty by the device of the present invention which goes alternately modulate the color of its lighting according to that of the marks read by in order to make them, in turn, clearly visible.
  • a series of such sequences could include reading a group of several successive lines lit under the same color, then that of a succession of lines taken one by one alternately in one color then in another, before return to reading a group of several illuminated lines under the same lighting.
  • the device in question is a priori not limited by the possible number of lighting colors.
  • the intensity of this lighting could also be modulated and used to detect marks sought.
  • the use of filters generating different colors from a white light for example could also replace the diversity of lighting sources without, however, adding a characteristic news.
  • the number rows of photosensitive elements does not limit the applications offered by this device as described above.
  • Figure 1 gives a schematic perspective representation of the device 1 of the present invention.
  • This device is placed above a support 2, running in a full color printing machine, so that that it can easily detect the passage of tracking marks 21, 22 printed on this support.
  • the reading device 1 consists of a case, drawn in broken lines and in partial section, in which are minus two light sources 3, 4 allowing both to project alternately on the support 2 a lighting zone 5 covering at least the area occupied by the marking marks 21, 22.
  • Each source lighting 3, 4 can be constituted by one or more diodes lights 13, 14 as illustrated by way of example in FIG. 1.
  • the reading device 1 also includes an optic 6 making it possible to project, on at least one photosensitive element 7, the image of a portion 8 of the surface of the support 2 which is lit in the zone 5.
  • the reading portion 8 corresponds to a strip whose dimensions are mainly chosen in according to those of the registration marks and the content of the specifications reading device charges; the latter defining in particular the resolution the image of said scanned registration marks, as well as the speed acquisition of these images by the reading device as a function of the speed of displacement of the support 2.
  • the photosensitive element 7 can be a sensor CCD composed of a large number of pixels 17 generating pulses electric and forming, depending on their number and arrangement, one or more photosensitive strips placed side by side. In Figure 1, only one strip of pixels 17 constitutes the photosensitive element 7 as illustrated. This last one is connected, like the reading sources 3 and 4, to a microprocessor 9 allowing in particular to control the lighting of these sources according to a mode programmed and to process the pulses delivered by each pixel 17.
  • the operating principle of this device aims to be able to scan the registration marks 21, 22 in their entirety by entering successively adjacent image portions 8, lit alternately in one color then in another thanks to the light sources 3, 4.
  • Each portion 8 of registration marks is preferably read only one only once under the light of one of the lighting sources, which sources follow sequences of lighting governed in time and in duration according to the mode programmed in the microprocessor 9.
  • the final image of the registration marks taken by this device can be easily recomposed by successively assembling all the portions read 8 in the same order than that defined naturally during the acquisition by the displacement of the support 2. Once recomposed, this image, or the data it contains, can then be used to determine the possible shifts between the colors different impressions during the tracking operation of the corresponding printing cylinders.
  • Figures 2 and 3 each give examples of two couples of registration marks 21, 22 and 31, 32 as they could be found on the support 2 after it has been printed by a polychrome machine. In these illustrations, the dimensions of these marks are greatly enlarged; in in reality, they each occupy only an area of a few square millimeters.
  • the registration marks in figure 2 correspond to those which are illustrated in Figure 1, but it goes without saying that other registration marks, like those of Figure 3 for example, could be represented there.
  • Each mark of a couple is of a different color; so the color of the mark 21 or 31 is not the same as that of mark 22 or respectively 32.
  • the marks 21 and 22 of triangular shapes are exactly opposed by their points and are therefore perfectly in register with each other, as do the marks 31 and 32 which are perfectly concentric.
  • these are scanned by the reading device 1 of the present invention. Being of a different color, often pale and with little contrast, and although read simultaneously, each of these registration marks needs to be lit by a complementary color light to be rendered clearly visible. This improves the contrast and ensures that it can be correctly detected by the photosensitive element 7.
  • the reading device according to the invention makes it possible to fully respond to these requirements thanks to the alternating lighting illustrated in figures 4 and 5 on the registration marks of the corresponding figures 2 and 3.
  • Figure 4 gives, in a plan view, an example of a representation of the lighting of the reading device 1 applied to the brands of triangular marking 21, 22.
  • the presence of these marking marks can then be made clearly visible by the succession of portions 8, or reading slices, generated by device 1. These appear alternately in one color then in another, forming fine bands 8a, 8b of identical dimensions. These colors correspond to those separate light sources 3, 4 which are chosen according to the colors of the markings read.
  • the bands 8a, 8b each have a color that reveals a strong contrast with that of the registration marks 21, 22 taken respectively. Under this striped lighting, it becomes possible to clearly highlight the contours of the two registration marks read simultaneously.
  • the contours of each of these marks take shape like a dashed line that easily allows a complete reconstitution of the shape of the mark and perfect detection of it during the setting operation of the printing cylinders.
  • Figure 5 provides a reconstruction of the image of the brands of concentric location of FIG. 3 from the portions 8 of images read by device 1 in a lighting mode which differs from that used previously.
  • the first one sequence is formed by an alternation of a group 18 of three thin bands contiguous 8a with a group 28 of three thin contiguous bands 8b of another color.
  • This succession of alternations is followed, in the central part of the registration mark 32, by a second sequence formed of a series of alternations of bands 8a and 8b taken one by one, before moving on to new to the first sequence formed by the alternations of groups 18 and 28.
  • the reading device may well heard to do without the alternation of lighting colors and illuminate said marks with one color light all the time what their reading takes. It should also be noted that, as necessary, changes in light intensity can easily replace alternating colors without the detection principle used by this device be modified. It also goes without saying that the number of brands of marking which can be read simultaneously by this device is not a priori limit. You just have to adapt the number of color light sources different from device 1, without however excluding all combinations of possible colors given for example by activating both a source of blue light and a yellow light source to get on the support printed an area 5 lit by a green light.
  • the diodes luminous 13, 14 could also each emit a colored light different.
  • the wavelengths emitted by said light sources 3, 4 are not necessarily limited to the beach covered by the visible area.
  • the pixels 17, which in large numbers constitute the photosensitive element 7, can have different length sensitivities to each other of waves they receive. So for example, some 17 pixels could be more particularly sensitive to red-orange colors while others would rather be receptive to blue-green or yellow colors. To analyze the image read, it would be enough for example to use the pixels of adequate colors to find brands of different colors.

Landscapes

  • Spectrometry And Color Measurement (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
EP01128209A 2000-12-27 2001-11-28 Vorrichtung zur Abtastung von Registermarken in einer Mehrfarbendruckmaschine Expired - Lifetime EP1219420B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH25282000 2000-12-27
CH02528/00A CH694184A5 (fr) 2000-12-27 2000-12-27 Dispositif de lecture de marques de rep'rage dans une machine d'impression polychrome.

Publications (2)

Publication Number Publication Date
EP1219420A1 true EP1219420A1 (de) 2002-07-03
EP1219420B1 EP1219420B1 (de) 2008-04-16

Family

ID=4569879

Family Applications (1)

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EP01128209A Expired - Lifetime EP1219420B1 (de) 2000-12-27 2001-11-28 Vorrichtung zur Abtastung von Registermarken in einer Mehrfarbendruckmaschine

Country Status (5)

Country Link
US (1) US7170648B2 (de)
EP (1) EP1219420B1 (de)
JP (1) JP2002240247A (de)
CH (1) CH694184A5 (de)
DE (1) DE60133620T2 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008120100A2 (en) * 2007-03-30 2008-10-09 Omet S.R.L. System and method for controlling and adjusting printing stations in a rotary printing machine
DE102007031088A1 (de) * 2007-07-04 2009-01-08 Manroland Ag Verfahren zur messtechnischen Erfassung eines bedruckten Bedruckstoffs
US8355153B2 (en) 2008-11-13 2013-01-15 Heidelberger Druckmaschinen Ag Compact register mark

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1157837B1 (de) * 2000-05-17 2009-06-24 Eastman Kodak Company Verfahren zur Registereinstellung an einer Mehrfarbendruckmaschine
DE102004021597B4 (de) * 2004-05-03 2017-04-13 Heidelberger Druckmaschinen Ag Registermarke
US7423280B2 (en) * 2004-08-09 2008-09-09 Quad/Tech, Inc. Web inspection module including contact image sensors
US7894105B2 (en) * 2005-01-18 2011-02-22 Canon Kabushiki Kaisha Image reading unit and image reader
US7692832B2 (en) * 2006-04-25 2010-04-06 Xerox Corporation Method for correcting scanner non-uniformity
DE102016201509A1 (de) 2015-03-02 2016-09-08 Heidelberger Druckmaschinen Ag Automatische Kontrastbestimmung
JP6504672B2 (ja) * 2015-04-28 2019-04-24 株式会社ニレコ 多色印刷機におけるレジスタマーク検出装置の光センサ

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311352C1 (de) * 1983-03-29 1984-03-15 Ingenieurbüro Rudolf Weber KG, 6100 Darmstadt Detektor zur Registrierung von Marken
EP0214214A1 (de) 1985-03-08 1987-03-18 Bertin & Cie Vorrichtung und verfahren zum positionieren von gegenständen, insbesondere von farbdruckzylindern, in rotations-offset-pressen.
WO1987006190A1 (en) * 1986-04-14 1987-10-22 Valtion Teknillinen Tutkimuskeskus Method for controlling print quality
EP0401691A2 (de) 1989-06-08 1990-12-12 Bobst S.A. Vorrichtung und Verfahren zum Detektieren von Registermarken in einer Mehrfarbendruckpresse
EP0512448A1 (de) 1991-05-06 1992-11-11 Bobst S.A. Vorrichtung zum Lesen von blassen Farbmarken in Druckmaschinen
EP0541990A1 (de) * 1991-11-14 1993-05-19 Bobst S.A. Registerregelung in einer rotierenden Druckmaschine
US5747795A (en) 1995-05-08 1998-05-05 Bobst Sa Photoelectric detector for a register control device within a rotary printing machine
CH690096A5 (fr) 1994-05-25 2000-04-28 Bobst Sa Dispositif et procédé de contrôle du registre dans une machine d'impression rotative polychrome.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6453121A (en) 1987-08-24 1989-03-01 Toyo Ink Mfg Co Color discriminating device
JPH05133726A (ja) 1991-11-13 1993-05-28 Hitachi Ltd パターン読取方法および装置
US5600487A (en) * 1994-04-14 1997-02-04 Omron Corporation Dichroic mirror for separating/synthesizing light with a plurality of wavelengths and optical apparatus and detecting method using the same
US6657758B1 (en) * 1998-06-04 2003-12-02 Board Of Regents, The University Of Texas System Variable spectrum generator system

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3311352C1 (de) * 1983-03-29 1984-03-15 Ingenieurbüro Rudolf Weber KG, 6100 Darmstadt Detektor zur Registrierung von Marken
EP0214214A1 (de) 1985-03-08 1987-03-18 Bertin & Cie Vorrichtung und verfahren zum positionieren von gegenständen, insbesondere von farbdruckzylindern, in rotations-offset-pressen.
WO1987006190A1 (en) * 1986-04-14 1987-10-22 Valtion Teknillinen Tutkimuskeskus Method for controlling print quality
EP0401691A2 (de) 1989-06-08 1990-12-12 Bobst S.A. Vorrichtung und Verfahren zum Detektieren von Registermarken in einer Mehrfarbendruckpresse
EP0512448A1 (de) 1991-05-06 1992-11-11 Bobst S.A. Vorrichtung zum Lesen von blassen Farbmarken in Druckmaschinen
EP0541990A1 (de) * 1991-11-14 1993-05-19 Bobst S.A. Registerregelung in einer rotierenden Druckmaschine
CH686501A5 (de) 1991-11-14 1996-04-15 Bobst Sa Dispositif de contrale du registre dans une machine a imprimer rotative.
CH690096A5 (fr) 1994-05-25 2000-04-28 Bobst Sa Dispositif et procédé de contrôle du registre dans une machine d'impression rotative polychrome.
US5747795A (en) 1995-05-08 1998-05-05 Bobst Sa Photoelectric detector for a register control device within a rotary printing machine

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008120100A2 (en) * 2007-03-30 2008-10-09 Omet S.R.L. System and method for controlling and adjusting printing stations in a rotary printing machine
WO2008120100A3 (en) * 2007-03-30 2009-01-08 Omet Srl System and method for controlling and adjusting printing stations in a rotary printing machine
DE102007031088A1 (de) * 2007-07-04 2009-01-08 Manroland Ag Verfahren zur messtechnischen Erfassung eines bedruckten Bedruckstoffs
US8355153B2 (en) 2008-11-13 2013-01-15 Heidelberger Druckmaschinen Ag Compact register mark

Also Published As

Publication number Publication date
JP2002240247A (ja) 2002-08-28
US20020080430A1 (en) 2002-06-27
CH694184A5 (fr) 2004-08-31
DE60133620T2 (de) 2009-05-20
US7170648B2 (en) 2007-01-30
DE60133620D1 (de) 2008-05-29
EP1219420B1 (de) 2008-04-16

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