EP0884179B1 - Procédé de regulation des operations effectuées par une machine d'impression - Google Patents

Procédé de regulation des operations effectuées par une machine d'impression Download PDF

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Publication number
EP0884179B1
EP0884179B1 EP98106542A EP98106542A EP0884179B1 EP 0884179 B1 EP0884179 B1 EP 0884179B1 EP 98106542 A EP98106542 A EP 98106542A EP 98106542 A EP98106542 A EP 98106542A EP 0884179 B1 EP0884179 B1 EP 0884179B1
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EP
European Patent Office
Prior art keywords
image
color
values
control
signals
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
EP98106542A
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German (de)
English (en)
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EP0884179A1 (fr
Inventor
Helmut Prof. Dr. Kipphan
Wolfgang Geissler
Gerhard Dr. Fischer
Werner Dr. Huber
Bernd Kistler
Gerhard Löffler
Anton Rodi
Harald Bucher
Clemens Dr. Rensch
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Heidelberger Druckmaschinen AG
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Heidelberger Druckmaschinen AG
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Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0884179A1 publication Critical patent/EP0884179A1/fr
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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
    • B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
    • 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
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • 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
    • B41P2233/51—Marks on printed material for colour quality control

Definitions

  • the invention relates to a method for Regulation of operations a printing machine.
  • the invention is the devices are particularly applicable to printing presses for handling, printing and treating sheets or other surfaces to be printed. Furthermore, the invention is for controlling or regulating Devices applicable, the or a printing press are subordinate, such as devices for separating, folding, Cut, collect, stack, insert, insert, sort and depositing sheets or webs. Further Areas of application are machines and devices for bookbinding production and further processing of Printed matter and devices for the inspection of Printed matter that u. a. a pictorial representation of the Surface and / or a quality assessment of the Allow printed matter.
  • the invention is used for control and rules of operations that shape and / or Coloring of an arch, a path or one Influence the printed product significantly.
  • color control it is known to use color measurements in Color fields of a certain color of the print control strip To gain actual values for the color control. It is also, especially known for spot and special colors, actual values for the color control from image areas printed in full tones to win.
  • the color measurement in the color fields or in the Spot image areas can be inside the press or offline off the press, why a sample sheet is removed from the process and one Color measuring arrangement is supplied.
  • the opto electronically obtained color measurement values can be sent to a control and control circuitry are passed where they are with Setpoints are compared and in manipulated variables for Control elements of a color distribution device converted become.
  • register setting facilities that have online acting register mark sensors, which on in Register mark traces with printed register marks directed are. There are also offline working facilities at those with a register cross reader the accuracy of Fitting crosses is measured and the measured values then said machine control are passed on where Generated manipulated variables for the register setting devices become.
  • the accuracy of such color measuring fields and registration marks is due to assembly, copying and development errors in the Prepress limited. Furthermore, they do not limit to print control strip and the actual print image Fitting crosses for the print image on the substrate Available space.
  • the color measurement fields of a Print control strip which is usually the actual one Upstream print image in the transport direction of the substrate or arranged below are only limited representative of the printed image.
  • the offline color measurements delay the color control process, with until adjustment a lot of waste occurs in an okay state. Undefined Drawing times, especially when the Condition of the printing press, lead to problems such as B. overshoot in the color control. Furthermore, they are previous solutions regarding the choice of the color measurement location inflexible.
  • the object of the invention is a method to develop that the operator at Quality assurance supports and complements that's a quick settlement ensures that the amount of waste is reduced and that the effort and the costs for the control or regulation of operations of a printing machine decreased
  • the object is achieved by a method having the features of claim 1.
  • a device for control or regulation of operations of a printing machine with which the procedure can be carried out consists of at least one image recording device that on the Surface of the printed product is directed and with a control and regulation circuit is connected.
  • the tax and control circuit image information can be supplied that the Play the surface of the printed product.
  • For Influencing the operations within the printing machine stands the control and Control circuit in connection with actuators.
  • Image information is first generated using the control and Control circuit the coordinates for the measuring locations of the Image acquisition device determined.
  • the image information for The determination of the coordinates can be from different sources come from.
  • a first possibility is that the Image information taken from the image recording device be arranged in the printing machine and the one for scanning the surface of a Printed product is directed. To do this, the whole Surface or only parts of it can be scanned.
  • the printing press is a printing press
  • the image recording device preferably a last one Printing unit following the surface of a sheet or one Web is directed
  • the image information can be used Determination of the coordinates for the measuring locations of one in the Setup phase generated print image can be obtained. Since the Image recording device not only detects the printed image, but also the remaining area of the arch or a path, it is possible to use the procedure and set up for the purpose the material identification or material testing of the Use printing material, especially to determine the Whiteness or luminance level or to determine Color fluctuations or material defects, such as stains or Holes.
  • the printing machine is used exclusively for Inspection of printed matter is trained, then can the image information, with the help of the image recording device, from the surface of any one to be inspected Printed matter can be obtained.
  • Another way to get coordinates for the measurement sites determine is to use image information which are taken from an image recording device, which is an image of the surface of the printed product outside scans the printing machine. More options result from the fact that the image information with the help generated by a digital computer that is part of a Device for imaging is, or that already available image information taken from a data store become.
  • the selection of a suitable measuring location for a specific one Operation can be done with the help of a computer that be arranged within the control and regulating circuit can.
  • a computer that be arranged within the control and regulating circuit can.
  • dampening solution management and register are regulated or to be controlled, then coordinates for the Measuring locations of each of these operations determined.
  • a program runs in the computer that contains the appropriate ones Measurement locations.
  • To control the color of a printing press e.g. B. automatically determined from the image information measuring locations be in a color control strip and / or lie in the printed image itself.
  • Said program ensures that the measuring point is significant for determining the actual value of a or more defined colors.
  • a measuring point of a printing press is significant if as much color information as possible for the respective color contains. Suitable measuring points for color control found, for example, within dark gray areas. At Spot and special colors are the measuring points in solo standing colors, preferably in the 3/4-tone range.
  • Measuring point determination can be particularly critical tones are taken into account so that, for example, the measuring point for a subject in which furniture is depicted, in one brown-toned area or in a portrait in one flesh-colored area is determined.
  • the information about which of the critical at the respective pressure Color tone, the facility can be pre-arranged can be entered.
  • Such significant measuring locations are used for humidity control determined that in color-free areas in the scanning direction seen behind 3/4 tone areas or full tone areas.
  • Suitable measuring locations for register control can be found in the Print image with register cross-like structures, such as. B. thin lines and sharp edges, such as in the illustration of masts, antennas or windows in one Subject are present.
  • the Print products with the help of in the printing Machine arranged image recording device to the predetermined measuring locations scanned.
  • the actual picture signals are the control and regulation circuit fed, where they in one Comparator with target values from a reference variable encoder be compared.
  • Comparator with target values from a reference variable encoder be compared.
  • separate actual values are defined Measuring locations determined and compared with separate setpoints. To gain actual value for everyone to be regulated or controlling operations is per printing machine only one image acquisition device required.
  • the tax- and control circuit can be separate for each operation Facilities, comparators and reference gauges included.
  • the control and regulation circuit can be in a control console be housed and in conventional analog and digital circuit technology or implemented with fuzzy logic his.
  • the operator can control and Control circuitry interact, for which the control console a computer with a high resolution screen, with a alphanumeric keyboard, with a cursor control device and with an input and output device for data can be assigned.
  • the image from the surface of a Printed matter including that of the tax and Control circuit specific measuring locations are shown, where the measuring locations can be specially marked.
  • a difference image measured values of Operating variables and manipulated variables are displayed. The operator has the ability to control or regulate the Operations by interfering with the coordinates of the Measuring locations, the setpoints of operating variables or the Manipulated variables changed.
  • the image recording device can be on a plane guided or on a on the outer surface of a cylinder transported printed product. To this Way, it is possible not only in operations To control or regulate dependence on image signals originate from the surface of the printed matter, but also depending on image signals from the surface of the facilities transporting the printed matter come from.
  • An example is a gripper control which on the basis of the image signals, which the location of the Printed matter relative to the the printed matter in the Grippers holding transport devices include the Controls gripper opening times.
  • Image acquisition devices are all for photometric measurements suitable image sensors can be used, such as discrete color selective photodiodes and transistors, line and matrix-shaped CCD light receivers or Color picture tubes.
  • the working wavelength depends according to the type of image sensors used, so that both Thermal radiation, IR radiation, visible light or UV radiation than that containing the image information Radiation can be used.
  • the image recording device can Lens flare mode or work in transmitted light mode.
  • the angle of incidence and angle of exit for the measuring light is Adjusted reception characteristics of the image sensors.
  • the Image acquisition device is suitable for the entire width of the To scan the printed product. A cheap variant exists in a measuring bar that spans the entire width of the Printed product is arranged, with image signals from the actual printed image, but also signals from registration marks or Register marks and from the areas between the printed image and the edges of the printed product. If necessary, individual image sensors can be desensitized become.
  • a printing press is said to have further advantages of the device to be discribed:
  • the main application for a printing press is in simultaneous image inspection and color control, for which the Image acquisition device Color measurement values directly from the printed image records.
  • the color measurement values are preferably photometric according to the three-range method or with the help of a spectral measuring device won.
  • the spectral sensitivity of the measuring channels arranged in the image recording device for each area corresponds to the spectral value curves of one Normal observer.
  • the image sensors themselves can have defined spectral sensitivity or Image sensors with essentially the same sensitivity are used to filter the spectral value curves of the Adjusted normal observer.
  • the image sensors can e.g. B.
  • scanning the printing material zone by zone, the zone width can be variable, for which purpose signals from Image sensors can be captured accordingly in groups.
  • the scan zones can correspond to the zones from the Color distribution device of the printing press are specified. If in a scanning zone for one or more subjects, depending on the subject Colors there is no suitable measuring location, then can be used Color control Measured values from neighboring zones can be used. It is possible to do the complete with the image recording device Capture print image. However, only a part of the Printed image can be scanned. A special facility ensures that the same scanning location is found in every printed copy is detected. This can be done from stored image measurements previous measurement cycles are taken, whereby a Scanning location detection is possible. To determine the As described above, the scanning location can emit signals Devices for measuring the position of the substrate with respect to a reference location that the Control circuit are supplied so that a correlation of the Measured position values for the image signals are carried out.
  • Receivers are arranged a light attenuation arrangement. Furthermore, the intensity of the measuring light in Depending on the speed of the substrate or be regulated by the contrast at the measurement location, for what corresponding devices for speed measurement or for contrast measurement in connection with the measuring light source have to stand.
  • the speed can be from the signals an incremental encoder can be obtained with the the cylinders that support the substrate is coupled.
  • Another application of the device is that a Part of the elements belonging to the facility Image inspection is used. So that one Achieve overall quality control.
  • the Image acquisition device used as an online measuring arrangement. As with online color measurement, one becomes Comparison of the actual image data with reference values rough Color deviations and register errors, toning, pushing and Duplicate and a. Errors detected and displayed on the screen. Furthermore, through the entire printing material image inspection defects in and on the substrate, such as B. cracks, holes, edge irregularities of the Substrate, inclusions, slugs and printing errors other mechanical influences can be seen.
  • the signals of the comparison resulting from the image inspection will be where possible control elements of the printing press to influence various operations are supplied and / or Devices supplied for display and / or for Serve quality documentation.
  • An example of image inspection is the monitoring of Moisture control in an offset printing machine. You can do this e.g. B. those obtained with the image recording device Image data from the area of the start of printing over the entire Width of the substrate can be continuously evaluated. If the evaluation shows that the lubrication limit has been reached then the dampening solution distribution devices and where appropriate, the color distribution devices adjusted that the ink / fountain solution balance optimal production printing allowed.
  • the image recording device is as Gloss measuring device formed. It is possible to To provide a separate highlight source, the at a defined angle of incidence on the Printing material shines. It is also possible to Highlight measurement using at least one in the Image recording device arranged receiver light evaluate whose level of incidence and default is not in Transport direction of the printing material lies. The for color measurement or for image inspection Light source and receiver arrangement are used, wherein the secondary light striking a receiver is detected.
  • a register control device indicates signals Register actuators, both in terms of Image position to the substrate edges as well as with regard to the individual color images to each other a correction of the register cause.
  • an optical image guide For the transmission of the signals reproducing the image an optical image guide can be used, whose light entry surface is divided into partial areas, the sub-areas of light from the substrate from individual Record scanning zones. Then at the light exit surface Photoelectric receiver elements are provided, each are assigned to one of the scanning zones and the luminous flux convert into electrical signals.
  • That of the image recording device generated signals of a device for processing Image signals supplied.
  • the transmission of the image signals between the image recording device and the Processing device can also be wireless without Image conductor cables are made when used by the image sensors recorded information about an electromagnetic, acoustic or optical transmission and reception path be transmitted. Such a transmission link it is not necessary if the processing device is located locally Image acquisition device is assigned.
  • the facility for Processing of the image signals allowed depending on the operating mode the image recording device a data reduction, so that a optimal control time is guaranteed.
  • the processed image signals are the Comparator supplied and with reference signals compared, which can be found in a reference value generator.
  • a memory can be used as the reference variable encoder Contains target image data from a previous print job for the same print image. It is also possible that the memory contains target image data from the measurement a gut sheet with all colors and / or Individual color extracts of a gut sheet can be obtained. This Measurement only needs to be carried out once, for which the Press control can contain a program which the required color separations in response to a control signal delivers and initiates the measurements. From the measured values according to the grid, z. B. the area coverage of the individual colors and together with the Color setpoints from the color measurement on the good sheet in the Storage filed.
  • an image measuring device can be taken from a template that is appropriate for the stand was scanned.
  • the offline image measuring device and the online imaging device can be from be of the same type.
  • Drawing files can also be used as templates a scanned template are scanned, then to position the drawing files as they are on the should be arranged according to the template Reference source of layout signals can be supplied.
  • Another way of providing benchmarks results from the fact that the operator of the printing press a signal for data transfer to the reference variable encoder is given when the operator is visually and based on Measured values make the decision that the press is on is in a high-quality production state.
  • the processed actual image signals are as Transfer setpoints to the reference variable.
  • a device can be provided which are the intervals and amounts of interactive by the operator evaluates given control signals. If the distances between the control signals and the threshold values can fall below, then with this device a signal be generated for the okay state. As a result of this signal the actual values can be adopted as target values so that the current process conditions appropriate for printing Long be frozen until the operator of the press the above signals to the Control circuit there.
  • the reference signals can be a setpoint memory are taken from the control device of the printing press assigned. All are in the setpoint memory Data processing usual storage media, such as. B. Semiconductor memory, floppy disks, magnetic tapes and optical Memory, usable.
  • the reference signals can be obtained from the operator corrected or changed by hand. Likewise, the Operator the possibility of global reference signals as a percentage to change.
  • the output signal deviates from a limit value, then can an error signal is generated and output.
  • an acoustic signal is emitted.
  • the error signal can be optically on the Screen are generated, where on the screen Actual image and the specially marked faulty ones Images can be displayed.
  • the markings of the defective image areas can be simple, for example be geometric figures or in the form of a visually good visible false color representation.
  • the Control circuit is assigned an error detection logic the processed image signals or from the signals after the Comparator device to determine the type of error and can also be output on the screen.
  • the mistakes can u. a. classify into the following types of errors: Color errors, register errors, dampening errors, slugs, Flaws in the substrate, impurities in the Substrate and edge breakout in the substrate.
  • Exceeding the limit of the difference between Target and actual image values can also be used for one Sheet printing machine cause the incorrectly printed Sheets are discarded at a waste paper lock, whereby alternatively, a marking device, such as one Ink-jet printing device that can be provided defective sheet or parts of the respective sheet indicates.
  • a marking device such as one Ink-jet printing device that can be provided defective sheet or parts of the respective sheet indicates.
  • the Target / actual deviations are documented in intervals. For example, one described above Markers are used every 50th sheet or printed image with a serial number, the time of measurement and to print the amount of the target / actual deviation.
  • a sheetfed press can simultaneously Strip shooter actuated on the boom stack become.
  • those printed on the sheets quality documentation data are stored and at Required as a log with error statistics be issued.
  • the logged measurement data of the Sample sheets can be placed outside the press using a calibrated color difference measuring device preferably homogeneous measuring locations of the printed image can be checked again.
  • FIG. 1 In the scheme shown in Figure 1 one Color control system with the help of drive elements 1 a Web 2 for double-sided printing by printing units 3, 4 one Roll rotary printing machine 5 promoted.
  • the printing units 3, 4 contain color distribution devices 6, 7, 8, 9 which contain conventional zonal color metering elements and the in Transverse direction to the transport direction 10 of the web 2 Generate a defined color profile.
  • the web 2 is in contact with rubber cylinders 11, 12, 13, 14 set for pressure in one pass through the web-fed rotary printing press 5 printed multicolored on both sides.
  • the last printing unit 4 following are one each on the top and bottom of the web 2 Image recording device 15, 16 provided in Bearings 17, 18 pivotable and in guides 19, 20 vertically are displaceable to the transport direction 10.
  • the Image recording devices 15, 16 capture the entire width lane 2 and each contain at least one Light source 21, 22 and a variety of photoelectric Receivers 23, 24.
  • the phase of Rubber cylinder 11, 12, 13, 14 is with the help of Register setting devices 26, 27, 28, 29 changeable. All to control and regulate the operations of the Web-fed rotary printing press 5 necessary elements are included connected to a machine controller 30, which in a Control panel 31 is arranged.
  • the machine control 30 contains input and output points 32 for tax and Control signals. The connections shown in Fig.
  • Control circuit 33 includes u. a. a device 34 for Processing the image signals, a comparator 35, a Reference size transmitter 36, a control device 37 and a Error detection logic 38.
  • the device 34 for processing of the image signals stands with the photoelectric Receivers 23, 24 of the image recording devices 15, 16 in Connection.
  • the output of the device 37 for processing of the image signals is with an actual value input of the Comparator 35 connected, a setpoint input of the Comparator 35 in conjunction with the reference value transmitter 36 stands.
  • the output of the comparator 35 is one Input of the error detection logic 38 and the Control device 37 in connection.
  • a control exit of the Fault detection logic 38 is the one with a blocking input Control device 37 connected.
  • the exit of the Control device 37 is connected to the via an output point 32 Color dosing elements in the Color distribution devices 6, 7, 8, 9 connected.
  • the Output of the control device 37 is still with the Register setting devices 26, 27, 28, 29 connectable.
  • On the control panel 31 is a computer 39 with a Screen 40, a keyboard 41 and one Cursor control device 42 arranged.
  • the bus system of the Computer 39 is in via a further input / output point 32 the machine control 30 performed.
  • the Dial-up modem 45 is with an external transmission and Receiving unit 46 connected.
  • At an issuing point 32 an acoustic signal generator 47 to the machine control 30 connected.
  • a plurality of light sources 21, 22 are provided in the image recording devices 15, 16 evenly distributed along the line over the width of the web 2. With the help of elliptical mirrors, the light is thrown onto the web 2 at a defined angle of incidence.
  • Each individual light source 21, 22 is controlled by a programmable current source, so that the color temperature of the light sources 21, 22 can be regulated.
  • the actual luminous flux of each light source 21, 22 can be detected with the aid of optical fibers.
  • the measuring light reflected by the web 2 can be transmitted to the photoelectric receivers 23, 24 with the aid of an optically imaging system.
  • the luminous flux emanating from a picture element of the path 2 is proportional to the signal charge of a photodiode of a CCD line used as a receiver 23, 24.
  • the image recording devices 15, 16 can be displaced perpendicular to the direction of transport 10 and can be pivoted about the bearings 17, 18. Focusing and error compensation of the image recording device 15, 16 can thus be achieved. In a pivoted-out position of the image recording devices 15, 16, the calibration can be carried out on the basis of a color standard. It is also possible for the light source 21, 22 or the photoelectric receivers 23, 24 or only parts thereof to be displaceable in the direction of the optical axis in order to adjust the image recording devices 15, 16.
  • the color measurement in the printed image is carried out according to the so-called three-range method, it is necessary due to the different spectral properties of the optical measuring means and the photoelectric receivers 23, 24 in the individual color zones to provide spectrally matching components in the measuring beam path.
  • One method for the spectral adjustment consists in providing correction filter glasses in addition to the main filter necessary for the implementation of the three-range method.
  • Another method uses partial filters in which a large number of different color filters are cemented or sputtered onto neutral glass. The areas of the individual color filters are switched on or off by additional use of diaphragms and masks, so that the spectral course can be influenced.
  • four partial filters cemented onto a carrier plate are positioned over a circular aperture using a cross slide. To avoid temperature errors, the color filters and photoelectric receivers 23, 24 can be kept at a constant working temperature with a thermostat.
  • FIG. 2 is an image recording device 15, 16 with four different imaging systems 48, 49, 50, 51, facing the web 2 at the color filter 52, 53, 54, 55 are arranged.
  • 24 acting CCD sensors 56, 57, 58, 59 relative to the imaging systems 48, 49, 50, 51 are the CCD sensors 56, 57, 58, 59 with adjustment elements 60 coupled.
  • the Color filters 62, 63, 64, 65 are combined to form a block.
  • a protective glass 66 is located in front of the color filters 62, 63, 64, 65 intended.
  • the receivers 23 and 24 are fourfold CCD lines 67 provided on a common Adjusting element 68 are arranged. With this optical Arrangement will be in a color measurement in each Spectral ranges different image elements 69 on the four-fold CCD lines 67 shown, so that the one Pixel 69 belonging to different color measurement values Points in time.
  • the spacing of the picture elements 69 of the CCD lines 67 and the optical properties of the optical imaging system 61 are coordinated.
  • FIG. 4 shows an image recording device 15, 16 with a Lens array 70 shown.
  • the through the color filter 71st weighted image information is obtained with the lens array 70 coupled into an image guide 72. That at the exit of the Image guide 72 seated optical imaging system 73 brings the image information on a CCD sensor 74, which with Adjusting elements 75 is coupled.
  • On the optically imaging System 73 can also be omitted if the glass fibers of the image guide 72 via a fiber optic window or directly are coupled to the CCD sensor 74. This optical Arrangement must be separate for each process color used be provided.
  • FIG. 5 shows a diagram for an actual signal acquisition a cylinder 76 of a sheet-fed printing machine.
  • Receiver modules 77 are with the device 34 for Processing the image signals connected.
  • the also modular constructed light sources 78 are provided with a device 79 for Light quantity regulation, which is also within the Machine control 30 is housed connected.
  • a synchronization device 80 and a timer is provided, which is connected to an incremental encoder 81 are connected.
  • Image recording device 15 16 is intended to process the signal within device 34 are described below:
  • the electrical generated by the CCD sensors 82 Image signals are sequentially one as shown in Figure 6 Amplifier 83, a sample-and-hold element 84 and one Analog-digital converter 85 fed.
  • the exit of the Analog-to-digital converter 85 is with a digital Processing unit 86 connected, which u. a. the function of Control circuit 33 described in Figure 1 within the Machine control 30 takes over.
  • FIG. 8 shows schematically the difference image evaluation within the Processing unit 86.
  • the digital image signals arrive at a First correction element 87 equipped with memory units.
  • This correction element 87 contains a look-up table Linearization of the characteristic curve of the converter elements of the CCD sensors 82. The data required for this is provided by Start-up of the system with a white balance different levels of control of the CCD sensors 82 obtained and stored in the correction element 87.
  • the corrected Image signals become an input A of an accumulation unit 88 fed. With the help of the accumulation unit 88 different printing speeds controlled pixel-wise addition in connection with a Varying the integration time of the CCD sensors 82 compensated.
  • the subtotals are in one Line memory 89 stored with an input B of Accumulation unit 88 is connectable. That way ensures that through the brightest part of the picture CCD sensors 82 at maximum speed of the Rotary printing machine 5 is still sufficient, for example with 50%, can be controlled.
  • At the minimal Print speed is multiple measurements within one Measuring line possible, for example eight samples Full control of a line of CCD sensors 82, so that in this example a maximum compensable Speed ratio of 1:16 results.
  • the accumulation over n samples gives an improvement the signal-to-noise ratio at low Print speeds.
  • the accumulation is such that too to the k-th at input A of the accumulation unit 88 Sampling of image data of the nth pixel, which during the (k-1) th scan formed from the line memory 89 read out and to the input B of the accumulation unit 88 Subtotals supplied are added. Then will the new subtotal to a memory location n + 1 cached.
  • a timer 90 generates from the pulses of the incremental encoder 25 or 81, the addresses of the Line memory 89 and a list memory 91 and corrects the arising during the accumulation Address offset so that during the last accumulation the line memory 89 and an im List memory 91 contains shading memory synchronously to run. The timer 90 continues to supply the control signals and the multiplex clock for the CCD sensors 82.
  • the data from eight rows of CCD sensors 82 on the input of the Correction element 87 are multiplexed.
  • the timer will be 90 further signals about the thickness of the substrate 2 supplied, which was obtained with the aid of a thickness measuring device or that are already within the machine control 30 stand by. These signals are combined with the signals from the Encoder 25 linked so that the thickness of the Substrate 2 dependent speed and Measured position values for printing material 2 are corrected.
  • Processing unit 86 also contains one Multiplier 92 by means of which the input A accumulated image data from a last Accumulation of a measuring line and those at input B. reciprocal values of the standardized integration time with each other be multiplied.
  • a multiplier 93 connected downstream of the multiplier 92 causes a correction of the local intensity of the Light sources 21, 22 and 78 by the output signals the multiplier 92 with those stored in the list memory 91 Intensity correction factors are multiplied.
  • the lists for the multipliers 92, 93 are also in the List memory 91 stored, which also the prediction values for contains the integration time control.
  • the in List memory 91 stored list for shading correction is when starting the rotary printing press 5, as well the characteristic data of the input look-up table in Correction element 87 generated and running during a White value adjustment through selected blank image lines updated.
  • the Color value controller 95 is one Programmable gate array (PGA) circuitry using a AT bus 96, for example, the coordinates of the measuring fields the path 2 can be specified. The coordinates of the measuring fields for a certain color are with one of the actual ones Color control upstream process generated and on the AT bus 96 provided. Only for these measuring fields is with The color value controller 95 uses the color value of a pixel stored in a memory chip 97. The information this is done via control lines 98 of the pipeline bus 94 transfer.
  • PGA Programmable gate array
  • the memory module 97 contains the data Color vectors that can be read via the AT bus 96 for color measurement are.
  • the pixels used for color measurement are in one Fine grid addressable.
  • the measurement geometry can Fine grid can be shifted as desired and configured so that a better adaptation to given measurement geometries is realized.
  • the further processing is complete corrected image data from all generated on web 2 Color zones or from all across the direction of transport 10 arranged modules of the image recording device 15, 16 shown.
  • one in PGA technology executed data controller 99 the corrected Actual image data from across the entire surface of web 2 supplied to the bidirectional pipeline bus 94.
  • the transfer the actual image data on the pipeline bus 94 can be in the Measurement pauses or carried out synchronously with the web scanning become.
  • the data controller 99 is still with a Target image memory 100, a difference image memory 101, a parameter image memory 102 and an accumulated one Differential image memory 103 in connection. Loading the Data controller 99 and the selection of the operating modes takes place over the AT bus 96.
  • the memories 100 to 103 are with a address controller 104 implemented in PGA technology, to the control lines 98 of the pipeline bus 94 connected.
  • To evaluate the difference image and the accumulated difference image are the Differential image memory 101 and the accumulated Differential image memory 103 each with Look-up table blocks 105, 106 (LUT) in connection.
  • the LUT 105, 106 use data from the Target image memory 100 and parameter image memory 102 Transformation of the difference image data to colorimetric LAB values of the LAB color space.
  • the outputs of the LUT 105, 106 stand with a also realized in PGA technology Evaluation circuit 107 in connection.
  • To the Evaluation circuit 107 is a memory module 108 connected in which the coordinates during the image measurement of a coarse grid for faulty image areas become.
  • the data of the evaluation circuit 107 are via the AT bus 96 readable.
  • the data controller 99 and the evaluation circuit 107 are configured so that the target image memory 100 and the accumulated difference image memory 103 are combined to form a common memory.
  • a desired number m of accumulations can be entered to generate a target image.
  • the corrected image data are multiplexed in the data controller 99, so that after 2 m accumulations the target image is present in the target image memory 100 in a normalized manner.
  • the data controller 99 acts as an adder with an upstream multiplexer.
  • data controller 99 realizes an adder, which data for a current difference image from the Difference between the actual image data and the target image data. Furthermore, the data controller 99 realizes one Accumulator, wherein accumulated difference image data from the Sum of the data of an accumulated difference image and one current difference image are generated.
  • on the Pipelinebus 94 can optionally display the current difference image, the accumulated difference image or the target image for Forth processor are transmitted. The selection is made via a status register in the address controller 104, which via the AT bus 96 is loaded. The synchronization of the Address generation and used for memory management Address controller 104 is performed by the on the Control lines 98 provided signals. The selection of the Operating modes take place via a control register. The Address controller 104 continuously ensures the refresh of Memory 100-103.
  • 106 are during the image inspection depending on the parameter image data in Parameter image memory 102 and the absolute brightness that current difference image and the accumulated difference image rated. From the LUT 105, 106 the resulting data is assigned to the evaluation circuit 107 Difference image data error classes too. The error data will be for documentation and statistics in memory module 108 filed. If the amount of the difference image is one exceeds the predetermined limit, then the Evaluation circuit 107 an error message via the AT bus 96 discontinued. To do this, an address generator within the Evaluation circuit 107 in parallel to the address controller 104 Coarse grid, which is the location of the fault location facilitated. Fault location and type of fault are in the Memory chip 108 stored.
  • the parameter image memory 102 contains the control information about the processing of each individual pixel.
  • the data in the target image memory 100 can use this Tax information to reduce a required non-linear characteristic curve used for error evaluation become.
  • the following parameters are in the parameter memory 102 included: parameters for the edge markings, one Weight function for defining the weighting of image errors in the inspection process, color measurement values for a marked Pixel in a pointer-controlled list are stored, and the shading measuring points and Calibration points of the CCD sensors 82. By setting bits for the marginal markings the picture format is included the page limit.
  • the parameters for the Weight functions provide a measure of error assessment This allows errors in homogeneous areas of the Print image stronger than defects in contours in the print image be weighted.
  • a bit ENC for controlling the color measurement spent.
  • the pixels intended for color measurement are entered in a list in the order of their scanning, so that after further processing of the image measurement data by the Forth processor can be passed as color measurement values.
  • the ENC bit is selected in a blank measuring line, so that at the same time a Measurement of the paper white value of web 2 is carried out. These measured values are also formatted as list data.
  • the further processing, in particular the accumulation and the loading of the shading values is also carried out by the Forth processor adopted.
  • To calibrate the Absolute sensitivity of the CCD sensors 82 and Color temperature of the assigned light sources 21, 22 and 78 a special element of a CCD line is provided, the also by the set bit ENC in the list memory is taken over and thus for further evaluation Available.

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  • Engineering & Computer Science (AREA)
  • Quality & Reliability (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Claims (1)

  1. Procédé de régulation des opérations effectuées par une machine d'impression,
    par lequel des signaux vidéo reproduisant les surfaces d'un produit d'imprimerie sont obtenus et acheminés vers un dispositif de régulation grâce à un appareil de réception d'images, afin d'obtenir la valeur réelle d'une grandeur à réguler pour l'opération en question,
    par lequel les valeurs réelles sont comparées à des valeurs théoriques spécifiées par un opérateur,
    et par lequel on déduit, des valeurs de comparaison obtenues, des valeurs de réglage qui sont transmises à des organes de commande afin d'influer sur les grandeurs à réguler comme on le souhaite,
       caractérisé en ce que l'on évalue des intervalles de temps et des grandeurs des signaux de réglage provoqués par l'opérateur et qu'on les compare à des valeurs seuil,
    en ce que, lors du franchissement de la valeur seuil par défaut, les valeurs réelles existantes sont utilisées comme valeurs théoriques pour une phase d'impression continue,
    et en ce que l'on conserve les valeurs réelles reçues en tant que valeurs théoriques jusqu'à ce que l'opérateur transmette les signaux de réglage au dispositif de régulation à intervalles de temps plus courts.
EP98106542A 1993-06-25 1994-06-27 Procédé de regulation des operations effectuées par une machine d'impression Expired - Lifetime EP0884179B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4321179A DE4321179A1 (de) 1993-06-25 1993-06-25 Verfahren und Einrichtung zur Steuerung oder Regelung von Betriebsvorgängen einer drucktechnischen Maschine
DE4321179 1993-06-25
EP94921626A EP0705171B1 (fr) 1993-06-25 1994-06-27 Procede de commande ou de regulation une machine d'impression

Related Parent Applications (1)

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EP94921626A Division EP0705171B1 (fr) 1993-06-25 1994-06-27 Procede de commande ou de regulation une machine d'impression

Publications (2)

Publication Number Publication Date
EP0884179A1 EP0884179A1 (fr) 1998-12-16
EP0884179B1 true EP0884179B1 (fr) 2001-11-07

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Application Number Title Priority Date Filing Date
EP98106545A Expired - Lifetime EP0884182B1 (fr) 1993-06-25 1994-06-27 Procédé de regulation des operations effectuées par une machine d'impression
EP98106541A Expired - Lifetime EP0884178B1 (fr) 1993-06-25 1994-06-27 Procédé pour reguler l'encrage dans une machine d'impression
EP98106544A Expired - Lifetime EP0884181B1 (fr) 1993-06-25 1994-06-27 Procédé de regulation des operations effectuées par une machine d'impression
EP98106543A Revoked EP0884180B1 (fr) 1993-06-25 1994-06-27 Procédé de commande ou de regulation des operations effectuées par une machine d'impression
EP94921626A Expired - Lifetime EP0705171B1 (fr) 1993-06-25 1994-06-27 Procede de commande ou de regulation une machine d'impression
EP98106542A Expired - Lifetime EP0884179B1 (fr) 1993-06-25 1994-06-27 Procédé de regulation des operations effectuées par une machine d'impression

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Application Number Title Priority Date Filing Date
EP98106545A Expired - Lifetime EP0884182B1 (fr) 1993-06-25 1994-06-27 Procédé de regulation des operations effectuées par une machine d'impression
EP98106541A Expired - Lifetime EP0884178B1 (fr) 1993-06-25 1994-06-27 Procédé pour reguler l'encrage dans une machine d'impression
EP98106544A Expired - Lifetime EP0884181B1 (fr) 1993-06-25 1994-06-27 Procédé de regulation des operations effectuées par une machine d'impression
EP98106543A Revoked EP0884180B1 (fr) 1993-06-25 1994-06-27 Procédé de commande ou de regulation des operations effectuées par une machine d'impression
EP94921626A Expired - Lifetime EP0705171B1 (fr) 1993-06-25 1994-06-27 Procede de commande ou de regulation une machine d'impression

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US (2) US6050192A (fr)
EP (6) EP0884182B1 (fr)
DE (7) DE4321179A1 (fr)
WO (1) WO1995000336A2 (fr)

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DE59409943D1 (de) 2001-12-13
US6050192A (en) 2000-04-18
US6119594A (en) 2000-09-19
EP0705171A1 (fr) 1996-04-10
EP0705171B1 (fr) 2002-03-06
EP0884179A1 (fr) 1998-12-16
DE59410074D1 (de) 2002-04-11
DE59409945D1 (de) 2001-12-13
DE59409944D1 (de) 2001-12-13
EP0884180A1 (fr) 1998-12-16
DE59409900D1 (de) 2001-11-08
EP0884181A1 (fr) 1998-12-16
EP0884182B1 (fr) 2001-11-07
EP0884180B1 (fr) 2003-01-22
WO1995000336A2 (fr) 1995-01-05
DE59410234D1 (de) 2003-02-27
EP0884181B1 (fr) 2001-11-07
DE4321179A1 (de) 1995-01-05
EP0884178B1 (fr) 2001-10-04
EP0884178A1 (fr) 1998-12-16
EP0884182A1 (fr) 1998-12-16

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