EP0401691B1 - Procédé et dispositif de détection des marques de réperage de l'impression dans une presse à imprimer à plusieurs couleurs - Google Patents

Procédé et dispositif de détection des marques de réperage de l'impression dans une presse à imprimer à plusieurs couleurs Download PDF

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Publication number
EP0401691B1
EP0401691B1 EP90110405A EP90110405A EP0401691B1 EP 0401691 B1 EP0401691 B1 EP 0401691B1 EP 90110405 A EP90110405 A EP 90110405A EP 90110405 A EP90110405 A EP 90110405A EP 0401691 B1 EP0401691 B1 EP 0401691B1
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EP
European Patent Office
Prior art keywords
mark
basic area
registration
area
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.)
Expired - Lifetime
Application number
EP90110405A
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German (de)
English (en)
French (fr)
Other versions
EP0401691A3 (fr
EP0401691A2 (fr
Inventor
Roger Roch
Vaclav Vitous
Panayotis Kammenos
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 EP0401691A2 publication Critical patent/EP0401691A2/fr
Publication of EP0401691A3 publication Critical patent/EP0401691A3/fr
Application granted granted Critical
Publication of EP0401691B1 publication Critical patent/EP0401691B1/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
    • B41F33/0081—Devices for scanning register marks
    • 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
    • B41P2233/50—Marks on printed material
    • B41P2233/52—Marks on printed material for registering

Definitions

  • the subject of the present invention is a method and a device for detecting marks for printing in a multi-color printing press working on a material, in strip or in sheets, having an image printing area and an area for printing signs of print quality control.
  • One of the solutions which has been adopted consists in printing one or more registration marks, in relation to the printed image, in an unprinted zone of the material, in strip or in sheets, worked by the printing press, by example in the edge of the sheet or the strip or sometimes, in a space separating two successive impressions.
  • These registration marks which must also serve to control the longitudinal and lateral registration errors, are generally trapezoidal in shape and are detected using a reading device.
  • To check the position of the registration mark affixed by a printing group with the position of the registration mark applied by another printing group it is first necessary to open a reading window in the area where the 'The location of the tracking mark is anticipated. It is then necessary to define the position of this reading window and to recognize, within this one, an image which is effectively the mark of reference.
  • the following operation consists in measuring the dimension of the mark, in an identical zone for all the successive marks parading in front of the reading device, so as to know the existing locating error. Finally, it is necessary to transform this measurement information into a corrective signal which can be used by the marking correction bodies. In this solution, the size of the registration marks is relatively large, in order to allow good reading.
  • a device for obtaining a reading window is described in detail in patent CH 548933 and a device for reading and recognizing registration marks is the subject of patent CH 556738.
  • the object of the present invention is to provide a solution to the problem of waste material when using registration marks to correct the longitudinal and lateral errors of printing, while considerably increasing the reliability of detection of registration marks. .
  • the invention proposes a detection method in accordance with what is stated in claim 1, as well as a device for implementing the method in accordance with what is stated in claim 5.
  • Figure 1 shows the appearance of a first printed registration mark 1 carried by a strip material 2 such as, for example, cardboard.
  • This printed registration mark 1 is affixed in an area called the print quality control signs of the print quality area, for example the area between two images printed on the strip 2 or else in an area on the margin of strip 2 to be printed.
  • the reason for printing the printed registration mark 1 in the area reserved for print control signs is motivated by the fact that the print control signs are still on strip 2 and that, by placing the printed registration marks 1 there, the area is removed specific area reserved exclusively for printing registration marks and thereby eliminating waste, also increasing the useful surface to be printed.
  • the printed marking mark 1 in FIG. 1 is made up of 5 signs 3a to 3e. These signs 3a to 3e are represented here as being points distributed in staggered rows, in the manner of the number five carried by the face of a die.
  • the printed registration mark 1 also includes three color printing indicators 4a to 4c.
  • the color printing indicator 4a being that corresponding to the printing group applying the blue color
  • the color printing indicator 4b being that corresponding to the printing group applying the red color
  • the color printing indicator 4c being that corresponding to the printing group applying the color yellow.
  • the printing group applying the black color in this case being the first printing group, will be the reference group and its color printing indicator will be represented by the five signs 3a to 3e of the printed registration mark 1.
  • FIG. 1 also shows, in phantom, basic fields 5a to 5c which are assigned to each of the color print indicators 4a to 4c.
  • basic fields 5a to 5c represented here in a substantially square shape, a geometric center 6a to 6c for each of them. It is also possible to define the geometric center 7a to 7c of each of the color printing indicators 4a to 4c.
  • FIG. 2 shows a second registration mark 8, identical in all respects to the registration mark 1 in FIG. 1 as regards the arrangement of the signs 9a to 9e.
  • the second registration mark differs from the first by the position occupied by the colored printing indicators 10 to 10c which are arranged here outside the five signs 9a to 9e making up the registration mark 8.
  • This arrangement of the registration indicators color printing 10a to 10c is encountered, for example, when the machine is started, which can be assimilated to a transitional period during which the tracking error can be greater than in normal cruising conditions. However, it is necessary to be able to detect these errors in the position of the color printing indicators 10a to 10c in order to switch the device from the transient regime to the cruising regime.
  • FIG. 3 represents the image of a reference virtual reference mark 13 which has been placed, for reasons of clarity of the figure, in a square in dotted lines 14.
  • This virtual reference reference mark 13 comprises the same number of signs 15a to 15e as the printed registration mark 1 or 8.
  • the arrangement of these signs 15a to 15e, in the reference virtual reference mark 13, is identical to that of the printed registration mark 1 or 8
  • an adaptation of the image comparator will be carried out in order to support an admissible difference value between these different signs.
  • Figure 4 is a schematic view of a device for detecting registration marks intended for processing a double-sided printed web.
  • the device comprises a first high speed camera and low optical aberration 16 associated with a flash 17 for the front of the strip, and a second camera 23 associated with a flash 24 for the back of the strip.
  • the cameras 16 and 23 are connected to an image processing device 18 equipped with an image viewing monitor 19.
  • the image processing device is connected to a central unit 20 advantageously chosen as being a personal computer of the type PC - AT or similar.
  • the central unit 20 comprises an interface 21 for processing information relating to the operating conditions of the machine which are themselves recorded in a conditioning unit 22 for "machine" information.
  • This conditioning member 22 receives, from the machine, "INDEX” information originating from a pulse generator mounted on the printing cylinder of the machine.
  • This "INDEX” information corresponds to a position “zero” of the pulse generator and will be used to calculate, using a pulse counter, the number of pulses separating this "INDEX” position relative to the image of the printing cylinder photograph.
  • the pulse generator and the counter have not been shown in this figure.
  • the conditioning unit 22 also receives information P relating to the moment at which the flash 17 must be controlled respectively 24. This information comes from a pulse generator coupled to the counter (not shown) and will be defined as a function of the value issued for the "INDEX" information.
  • the conditioning unit 22 will emit, simultaneously and in order, a signal for choosing the camera SCAM, a signal for requesting a flash command DCFL and will receive, if the conditions are acceptable, a release signal SQ.
  • the receipt signal SQ having been received, the conditioning unit 22 will then issue the OFL1 flash order or the OFL2 flash order depending on whether camera 16 or camera 23 has been selected.
  • the OFL1 signal will be transmitted to the control circuit 25 of the flash 17 and the OFL2 signal will be transmitted to the control circuit 26 of the flash 24.
  • the connection between the image processing device 18 and the central unit 20 is made at l using an RS 232 cable while the central unit 20 is connected to the conditioning unit 22 using a BNET network.
  • FIG. 5 is a block diagram of the device of Figure 4, showing in detail the elements constituting the device for detecting registration marks.
  • This figure shows for memory the reading devices of the marking marks, that is to say the cameras 16 and 23, their respective flash 17 and 24 as well as their control circuit 25 and 26.
  • the central unit 20, its interface 21 and the packaging member 22 are also shown.
  • the image processing device 18 is shown in dotted lines.
  • This image processing device 18 comprises a digitizer 27 connected to a memory 28 in which a generator circuit 29 is provided for the reference virtual reference mark 13.
  • the image processing device 18 also comprises a discrimination unit 30 composed of a basic field generator 31, a basic field enlarger 32, an image comparator 33, a calculator of the geometric base field center 34, a color print indicator detector 35, a calculator of the geometric center of color print witness 36 and, finally, a position comparator of geometric centers 37 to establish the recognition of position errors between the geometric center of the base field and the geometric center of the color print witness .
  • the discrimination unit 30 is followed by a signal transmitter 38 which will serve as its output stage.
  • FIG. 6 is a functional flowchart of the device of Figure 4 to which we will refer below to explain the operation of the device for detecting registration marks.
  • This operation is as follows: First, read the printed registration mark. To do this, the flash and the camera must be controlled, which will be done using signals from the conditioning unit 22 (see FIG. 5). The image that has been read will then be digitized. We will then search, on the basis of this digitization, if it is indeed a registration mark, by comparing the digital image with a reference virtual registration mark. A read security mark will be given for all the signs making up the reference virtual reference mark, so as to admit a certain distortion between the read image and the reference image.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Spectrometry And Color Measurement (AREA)
EP90110405A 1989-06-08 1990-06-01 Procédé et dispositif de détection des marques de réperage de l'impression dans une presse à imprimer à plusieurs couleurs Expired - Lifetime EP0401691B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH2181/89 1989-06-08
CH2181/89A CH679990A5 (enrdf_load_stackoverflow) 1989-06-08 1989-06-08

Publications (3)

Publication Number Publication Date
EP0401691A2 EP0401691A2 (fr) 1990-12-12
EP0401691A3 EP0401691A3 (fr) 1991-07-24
EP0401691B1 true EP0401691B1 (fr) 1994-03-16

Family

ID=4227783

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90110405A Expired - Lifetime EP0401691B1 (fr) 1989-06-08 1990-06-01 Procédé et dispositif de détection des marques de réperage de l'impression dans une presse à imprimer à plusieurs couleurs

Country Status (11)

Country Link
US (1) US5138667A (enrdf_load_stackoverflow)
EP (1) EP0401691B1 (enrdf_load_stackoverflow)
JP (1) JPH03184052A (enrdf_load_stackoverflow)
AT (1) ATE102871T1 (enrdf_load_stackoverflow)
AU (1) AU634241B2 (enrdf_load_stackoverflow)
BR (1) BR9002694A (enrdf_load_stackoverflow)
CA (1) CA2018449C (enrdf_load_stackoverflow)
CH (1) CH679990A5 (enrdf_load_stackoverflow)
DE (1) DE69007339T2 (enrdf_load_stackoverflow)
DK (1) DK0401691T3 (enrdf_load_stackoverflow)
ES (1) ES2050879T3 (enrdf_load_stackoverflow)

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Also Published As

Publication number Publication date
DE69007339T2 (de) 1994-06-23
CA2018449A1 (en) 1990-12-08
EP0401691A3 (fr) 1991-07-24
DK0401691T3 (da) 1994-08-08
BR9002694A (pt) 1991-08-20
ATE102871T1 (de) 1994-04-15
JPH03184052A (ja) 1991-08-12
AU634241B2 (en) 1993-02-18
US5138667A (en) 1992-08-11
CH679990A5 (enrdf_load_stackoverflow) 1992-05-29
EP0401691A2 (fr) 1990-12-12
CA2018449C (en) 1994-03-29
ES2050879T3 (es) 1994-06-01
DE69007339D1 (de) 1994-04-21
AU5689390A (en) 1990-12-13

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