EP2313272A1 - Verfahren zur prüfung von mindestens einem in einer druckmaschine ermittelten messwert auf seine plausibilität - Google Patents
Verfahren zur prüfung von mindestens einem in einer druckmaschine ermittelten messwert auf seine plausibilitätInfo
- Publication number
- EP2313272A1 EP2313272A1 EP09781736A EP09781736A EP2313272A1 EP 2313272 A1 EP2313272 A1 EP 2313272A1 EP 09781736 A EP09781736 A EP 09781736A EP 09781736 A EP09781736 A EP 09781736A EP 2313272 A1 EP2313272 A1 EP 2313272A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- printing
- color
- ink
- measured value
- determined
- 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
Links
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
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- 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 testing at least one measured value determined in a printing machine for its plausibility according to the features of claim 1.
- WO 2005/092613 A2 discloses a printing machine preferably printing in multicolor printing with at least one inking unit having a metering device, wherein the metering device of the inking unit is regulated by a control device, wherein the control device is connected to a preferably optical detection device, the detection device having a On a surface of a printed substrate in the printing material directed sensor detects the quality of the pressure.
- EP 1 437 222 A1 discloses a method for printing a color measuring strip having a plurality of measuring fields, wherein the color densities applied to a printing material in the individual measuring fields are measured and used for a color control of a printing machine, wherein the same extends longitudinally to the transport direction of the printing material
- Color zone are arranged transversely to the transport direction of this printing material juxtaposed measuring fields in each case in three groups of measuring fields, each associated with the pressure inks ink associated measuring fields in each case in the same order next to each other, each having a ratio or a difference in a measuring field of the middle Group measured color density of a particular color to the other two each measured in a measuring field of the other two groups color densities of the same color is formed, it is checked whether the determined Ratio or difference within permitted pre-established limits. A result lying outside this defined limit is z. B. rated as a tone or as a smear.
- a device for the densitometric measurement of printed products is known from EP 1 084 843 A1, wherein measured results of a densitometer measuring head are used for setting commands for a color guide of a printing machine with predetermined nominal values, wherein a comparison unit downstream of the densitometer and comprising an arithmetic unit the color density values of a measuring field are made with the adjacent measuring fields of the same color and measuring field type (full tone or raster tone).
- a method for evaluating an image from a predetermined section of a printed product in which an image of a predetermined section of the printed product is taken by a camera with an electronic area image sensor in which a detected by the image sensor Image is read out and processed by an electronic evaluation unit, wherein intensity signals recorded by first predetermined fields within the section are computationally linked to reference data values which represent a measure of the intensity of the light remission of unprinted regions of the printed product, wherein an image of a white reference is recorded at the beginning and deriving from the intensity signals of this image, basic reference data for the entire section, wherein upon each evaluation of an image of the predetermined section from second predetermined fields within the output Correction data are derived, and before the arithmetic operation, the intensity signals recorded by the first predetermined fields within the predetermined section are determined together with the reference data by a mathematical combination of the basic reference data with the correction data.
- DE 10 2004 021 601 A1 discloses a method for use in a printing press with at least one inking unit, wherein at least one setting of the relevant inking unit is recorded in a running printing process of the printing press that prints on a surface of a printing substrate on the basis of at least one in the printing press in this printing process
- Measured value of a control device is changeable, wherein the control device checks the detected measured value before changing the setting of the inking unit in question for plausibility. For the plausibility check of the measured values z. B. limits for a deviation z. B. in the color density range, which may not exceed two consecutive or locally adjacent, combined measured values.
- DE 35 43 444 A1 discloses a method for achieving a uniform printing result on a multicolor autotype printing machine in which the supply of the printing inks to adjacent inking zones of a printing substrate is variable by means of actuators and in the measuring fields co-printed within the inking zones for controlling the printing process repeatedly solid densities and / or halftone dot sizes determined and the falling out of the same from their assigned tolerance ranges by operating the actuators corrective intervention in the printing process, and to maintain the color balance during the printing repeatedly selected relationships of solid densities and / or halftone dot sizes of different inks to each other determined and also when the selected relationships fall out of tolerance ranges associated therewith, they are intervened in the printing process by actuating the control elements.
- DD 80 046 A1 discloses a method for detecting waste copies in web printing, wherein one or more photoelectric pick-ups or illuminating and measuring beams measure the remission power of a non-printed area on the paper from one or both sides, this method offering the possibility of to use the measurement signal before blanking for the detection of unprinted copies or those with too little color guide.
- the invention has for its object to provide a method for testing at least one determined in a printing machine measurement on its plausibility.
- the advantages that can be achieved with the invention are, in particular, that in the case of a color control performed automatically in a running printing process within a printing machine, ie without operator intervention, the respective measured values indicating a color density are recorded inline in a simple manner and for this color control be evaluated.
- the acquired measured values z. B. from the color control performing control device first then checked to see if they match in z. B. are provided by a prepress for the current printing process setpoints in a plausible relation to each other.
- Example 2 the plausibility of at least one detected in the printing machine measured value of a color zone determined in a selected color density of a printing ink in relation to the respective measured value of a determined in another color zone color density of the same ink, these color zones are preferably arranged side by side transversely to the transport direction of the printing material , At least one of the two above-mentioned relations is preferably formed only under a certain condition, wherein this defined before the printing process, preferably freely parameterizable and stored in the regulating the inking device stored condition defines in which operating state of the printing machine, an automatic automatic color control makes sense. Because not in every operating condition of the printing machine is an active automatic color control makes sense, eg. B.
- each of a color density indicative measured values formed by the inking unit z. B. electronically and / or controlled by a program control device during the current printing process of the printing press to be checked for a change.
- the checking of this measured value which is preferably carried out continuously in the printing process within the printing machine, for its plausibility and the subsequent selective use of the relevant measured value for the color control contribute substantially to a stable control behavior of the control unit regulating the inking unit, which results in the production of high quality printed products Helps with high efficiency and helps avoid unnecessary interruptions of the printing operation.
- Fig. 1 is a simplified representation of an offset sheet printing machine
- FIG. 3 shows a schematic representation of a detection device which detects light remitted by a printed sheet and has an associated illumination device
- FIG. 4 shows a printed sheet with a measuring strip and a plurality of ink zones.
- Fig. 1 shows an example formed as a sheet-fed printing press.
- the printing machine can also be designed as a web-fed printing machine.
- the printing machine is designed in particular as an offset printing machine, wherein the printing press using a conventional or a waterless, d. H. can print without the addition of a fountain solution printing offset printing process.
- the printing machine preferably has a plurality of the same printing material 09 (FIG. 2) each with a printing ink z. B. in one of the shades black, cyan, magenta or yellow printing units 01 on.
- five printing units 01 are provided in a series transport manner in a direction indicated by arrows T of the printing material 09, wherein each of these printing units 01 z. B. has at least one each cooperating with a transfer cylinder 14 form cylinder 08.
- Each forme cylinder 08 is assigned in each case one printing ink to the forme cylinder 08 applying inking unit 07.
- the printing units 01 follow in Transport direction T of the substrate 09 z. B. a painting in the form of a paint tower 02 and a delivery extension 03 and a boom 04.
- a sheet feeder 06 is arranged at the opposite end of the sheet printing machine.
- the number of successive printing units 01 can be selected lower or higher as needed than in the example shown in FIG.
- An extension to ten printing units 01 is quite possible.
- At least one of the plurality of printing units 01 may be formed as an imprinter, so that on the printing machine a flying plate change, ie a change of printing plates to the respective forme cylinder 08 of the relevant printing unit 01 during ongoing production of the printing press due to a separation of the relevant forme cylinder 08 from the current Printing is possible.
- the sheet-fed printing machine can be provided for a perfecting, ie for a two-sided printing on the sheet-fed printing machine passing through substrate 09, and to realize this function z. B. have a turning device.
- the Imprinterfunktion can be provided for the perfecting, ie both sides of the printing material 09.
- Imprinter-capable printing units 01 can also be used for printing spot colors or special colors.
- an arrangement in the form of a tower with a substantially vertical guidance of the printing material 09 can also be provided.
- the lighter inks such.
- As yellow or magenta first printed the darker inks, such. Black or cyan.
- the printing material 09 is, depending on the type of printing press used, material in the form of printing sheet 09 or a material web, each of which preferably consists of a material made from digested vegetable fibers and, depending on its application and grammage, the product type paper ( ⁇ 150 g / m 2 ), cardboard (150 to 600 g / m 2 ) or cardboard (> 600 g / m 2 ) are attributable.
- the size of a printing sheet 09 may be longitudinal to its transport direction T (Fig. 4) by the printing machine z. B. more than 1, 000 mm and transverse to its transport direction T z. B. be more than 700 mm.
- a web can along its transport direction T by the printing press a width z. B. of more than 1, 000 mm. In roll printing widths z. B. realized by up to 2,600 mm.
- a paper consisting of 09 can be coated on one side or on both sides on its surface, ie with a white, single-layer or multi-layer coating amount of pigments, binders and additives, eg. As optical brighteners, be provided, whereby the surface of the printing material 09 is specifically influenced in terms of their brightness, color hue and / or their production-related structure or roughness.
- the basis weight of the amount of ink is z. B. in the range between 5 and 20 g / m 2 , preferably between 5 g / m 2 and 10 g / m 2 .
- the surface of the printing material 09 may, for. B. for use as banknote paper or document paper also have an embossed or embossed structure, which structure may be flat or formed as a relief.
- each color separation prints only one of the printing inks on the printing substrate 09.
- the primary inks used are magenta, cyan and yellow inks, from which a variety of other shades are mixed.
- usually ink in the color black is used.
- one or more spot colors can be printed to create a custom tone or effect in print.
- the colorimetric properties of the printing inks also depend, inter alia, on the chemical composition of their color pigments. For the most part, comparatively expensive color pigments can, for example, expand the color space reproducible with this printing ink. Moreover, from the substrate used 09 z. B. the reproducible with an ink color contrast. In coated papers, the overprinting of the primary inks for the solid tone achieves an optical density of approximately two density units (in short: 2D), in particular for the printing ink black.
- the multicolor print image 21 is composed by color separations each having dots, wherein a color separation is provided for all printing inks involved and the halftone dots of different color separations on the substrate 09 both side by side freestanding and are applied one above the other.
- the quality of the printing depends on the type and fineness of the screening, ie the shaping and Arrangement of grid points, influenced.
- halftone dots can typically be reliably transferred from a size of about 10 .mu.m, with screen rulings between 50 and 80 lines per cm being common in multicolor printing.
- Fine grids for the reproduction of filigree structures have up to 150 lines per cm, because the finer the screening, the higher the resolution of the print and thus the reproducibility of fine structures.
- Grid points can z. B. have a circular, square or elliptical shape and be arranged in an amplitude-modulated, frequency-modulated or intensity-modulated screening.
- the individual grid points In the case of an amplitude-modulated grid, the individual grid points have a constant center point spacing and vary in their areal extent, whereas with a frequency-modulated grid, the individual grid points have a constant areal extent with varying center distances.
- intensity-modulated screening the layer thickness of the screen dots applied to the printing material 09 is varied, as a result of which the optical density of the screen dots is changed. Hybrid forms of screening with multidimensional modulation are possible.
- the relative positioning of the halftone dots of different color separations involved in the printing and the degree of the areal distribution of the halftone dots in each of these color separations influences the quality of the print when the halftone dots are overprinted.
- overprinting the relative position of the color separations is referred to each other as a color register or as a passport.
- the nature of the inks used in printing has a lasting effect on the quality of the print.
- the nature of the ink also includes their rheological behavior, ie their flowability and their adhesion to the substrate 09 as well as grid points of at least one previously printed color separation.
- the fluidity of the ink is determined by its viscosity.
- the adhesion of the ink is specified by its speed.
- the viscosity and tack of an ink are temperature dependent. Also, a production speed of the printing press, with which the substrate 09 is transported through the printing press and the z. B. in a sheet-fed press 18,000 sheets / h or 16 m / s may be in a web printing press, at least indirectly on the viscosity and speed of the ink influence. In order for a subsequently printed ink to adhere to a previously printed ink when overprinting several inks, the subsequent ink must have a lower tack value ("trapping").
- the printing press shown in FIG. 1 has at least one detection device 1 1 with at least one preferably optical sensor 24 in or on at least one of its printing units 01 (FIG. 3), this sensor 24 acting on a surface of the printing material 09 printed in the printing press is determined and at least one correlated with the quality of the pressure measured value recorded.
- digital data are from the optical Detection device 1 1 sent to a control device 12, whereupon the control device 12, at least the at least one inking unit 07 in response to a difference between a specified as the desired value quality of the pressure and the actual value of the optical detection device 1 1 detected quality of the pressure preferably after reaching or Exceeding an allowable tolerance limit in a manner minimizing the difference between the setpoint and the actual value.
- a control exercised by the control device 12 with regard to the ink to be applied by the inking unit 07 to the printing substrate 09 is thus directly dependent on those data which are fed to the control device 12 from the detection device 11.
- Each inking unit 07 has a metering device for metering the amount of ink to be transferred to the printing material 09.
- This metering device can in the axial direction of the forme cylinder 08 side by side several, z. B. between 30 and 60 or more preferably equal width zones 22 - so-called ink zones 22 - (FIG. 2), wherein the dosage of the transferred to the substrate 09 ink from the control device 12 in different zones 22 differently adjustable and is traceable if necessary.
- the metering device can, for. B. controllable zone screws, wherein in the multi-color printing printing machine a total of several hundred individually controllable zone screws can be provided.
- the metering device meters a quantity of the ink to be transferred to the printing material 09 by adjusting its layer thickness and / or its application time as a function of a specification given by the regulating device 12.
- the metering device can also be used as an ink supply system using at least one paint pump, e.g. Example, as a Pumpfarbtechnik be formed, wherein ink is brought to a Farbduktor the inking unit 07 and the ink fountain roller preferably zonally by means of individually acting on the different ink zones 22 actuating means is metered, wherein the actuating means z.
- At least one Color meter or a paint slide have, wherein the actuator z. B. is designed as an adjustable by the control device 12 servo motor.
- the inking unit 07 can be used as a short inking unit or as one on the Farbtransportweg z. B. more than four rolls exhibiting conventional roller inking system may be formed.
- the printing press of the forme cylinder 08 and the associated transfer cylinder 14 are preferably each independently z. B. driven by a preferably position-controlled electric drive. Accordingly, the printing press is preferably designed without a shaft, wherein the drives of the forme cylinder 08 and / or the transfer cylinder 14 are mechanically decoupled from a drive of an associated impression cylinder 16.
- the forme cylinder 08 and the transfer cylinder 14 z. B. are mechanically coupled to gears and have a common preferably position-controlled drive, but that this common drive is mechanically decoupled in any case by a drive of the impression cylinder 16.
- each of these drives is a phase angle or angular position between the forme cylinder 08 and / or the transfer cylinder 14 relative to the impression cylinder 16 or relative to another forme cylinder 08 of the printing press adjustable and preferably adjustable, the phase or angular position for setting a circumferential register is available , But it can also be provided for positive adjustment of the forme cylinder 08 to the impression cylinder 14, an actuator for phase adjustment.
- the circumferential register influences the positional accuracy of a color separation relative to a reference edge or reference line of the printing material 09 directed transversely to the transport direction T of the printing material 09.
- the printing material 09 is passed between the impression cylinder 16 and a transfer cylinder 14 cooperating with the impression cylinder 16.
- each printing unit 01 of the printing press shown by way of example in FIG. 1 in each case has a dampening unit 17 cooperating with the forme cylinder 08.
- the least of two Printing units 01 of this printing press on the same substrate 09 printed inks preferably have mutually different hues.
- the optical detection device 11 provided for detecting the quality of the print is preferably designed as an inspection system, in particular as an in-line inspection system inspecting the printing substrate 09 during its transport through the printing press.
- An inspection system extends the functionality of an optical detection device 1 1 to the effect that, alternatively or in particular in addition to the detection of z.
- Disturbances detected by an inspection system are e.g. As scratches, kinks, paper or dirt particles, paint deposits or slugs.
- the optical detection device 1 1 preferably detects contactlessly in its basic function an acceptance of at least one printing ink on the printing substrate 09 printed on the printing machine. If at least one printing ink used in the printing is printed on the printing material 09 printed on the printing machine at the detection location of the optical detection device 1 1, the optical detection means 1 1 recognizes the presence of the printing ink on at least one condition of this printing ink.
- the nature of the printing ink can be its colorimetric hue, an optical density or a layer thickness, a shape, a position, an angle or a surface Distribution of their applied on the substrate 09 screen dots be.
- the optical detection device 1 1 can also z.
- a position of at least one raster point of an ink involved in the printing relative to a position of at least one raster point of at least one other participating in the printing ink or a position of at least one raster point of a participating in the printing ink in a printed on the substrate 09 print image 21 detect , wherein the first-mentioned detection option is a relative measurement and the second detection option is an absolute measurement, ie a determination of coordinates of the halftone dot with respect to the print image 21 to be printed.
- the optical detection device can detect 1 1 printed on opposite sides of the same substrate 09 printed images 21 and their relative position to each other, d. H. a so-called Wenderegister.
- the respective printed on one of the two sides of the printing material 09 printed images 21 preferably each consist of several color separations.
- the optical detection device 1 1 detects z. B. also a nature of the printed in the printing substrate 09.
- the nature of the printing material 09 is in particular a its printability or its printability relevant property.
- the nature of the printing material 09 can be a moisture elongation and / or a mechanical elongation of the surface thereof transversely and / or longitudinally in its transport direction T extending through the printing press.
- the nature of the printing material 09 can also be a coating amount applied to its surface, in particular a coating quantity applied to the surface of the printing material 09 with a coating weight of more than 5 g / m 2 .
- the nature of the printing material 09 may in particular also relate to a degree of whiteness of its surface.
- the optical detection device 1 1 detects at least one measuring field 13, wherein the relevant measuring field 13 is assigned to a specific one of the color separations involved in the printing process.
- the measuring field 13 contains halftone dots of at least one printing ink and is z. B. formed as a respective color separation associated solid field.
- the measuring field 13 may be part of a measuring strip 19 preferably arranged outside a printing area of the printing image 21 printed on the printing material 09, wherein the z. B. in the axial direction of the forme cylinder 08 line-shaped extending measuring strip 19 z. B. several preferably each same groups of each z. B. has five juxtaposed fields, each in each group a z. B.
- Each preferably square trained measuring field 13 and the white field 23 each have z. Eg the format of 6x6 mm.
- a group consisting of four juxtaposed measuring fields 13 and the white field 23 thus extends in the axial direction of the forme cylinder 08 z. B. over 30 mm, this extension z. B. a width b22 one of the ink zones 22 of the metering device of the inking unit 07 corresponds.
- the aforementioned group consisting of four adjacent measuring fields 13 and the white field 23 is arranged.
- the detection device 1 1 can in particular by the use of an optical device, for. As an objective, be formed such that it detects at least one transverse to the transport direction T extending width of a color separation, preferably even a transverse to the transport direction T width of the printing substrate 09.
- the detection device 1 1 is in the printing machine, preferably behind the transport direction T of the printing material 09 last printing unit 01 arranged. In a working in perfecting sheetfed press is the Detecting device 1 1 z. B. arranged in front of a turning device of the printing material 09.
- the detection device 1 1 preferably provides digital data, in particular image data, at its output corresponding to the detection of its sensor 24, which data are received and evaluated by the control device 12 connected to the detection device 11.
- the sensor 24 of the detection device 11 is preferably designed as an image sensor 24.
- the detection device 11 may have a plurality of sensors 24, including a plurality of image sensors 24.
- the sensor 24 is z. B. formed as a photodiode, the image sensor 24 z. As a CCD chip or as a CMOS chip.
- the sensor 24 preferably senses several shades, in particular simultaneously.
- the detection device 1 1 has as a sensor 24 z. B. a line camera or an area camera.
- a lighting device 18, which is also connected to the control device 12, is preferably provided.
- the lighting device 18 can emit their light permanently or pulsed and z. B. be formed as a cold light source, d. H. as a light source with only a very small or virtually nonexistent amount of infrared in its light.
- lighting means 18 z. B. brought several LEDs or laser diodes used.
- the cooling device can perform the cooling of the lamps with a gaseous or liquid coolant.
- the illumination device 18 may consist of a plurality of modules which can be coupled to each other for easier adaptation to a width of the measuring field 13, the color separation or the printing material 09 directed transversely to the transport direction T of the printing material 09.
- the illumination device 18 is preferably close to the printing ink on the printing substrate-transmitting transfer cylinder 14 or close to the Counter-pressure cylinder 16 is arranged.
- the lighting device 18 z. B. under a foot behind the last printing unit 01 of the printing press.
- the illumination device 18 has the surface of the printed substrate 09 a distance z. B. in the range between 30 mm and 200 mm, preferably between 80 mm and 140 mm, whereas the sensor 24 of the detection device 1 1 to the printing material 09 a in the range between 10 mm and 1,000 mm, preferably between 50 mm and 400 mm dimensioned Distance has.
- the distance of the illumination device 18 to the surface of the printed substrate 09 is selected such that on the one hand a uniform, intensive illumination of the surface of the printing substrate 09 takes place, but on the other hand pollution of the lighting device 18 is largely avoided by raised during transport of the printing material 09 dirt particles or a paint spray ,
- control exercised by the control device 12 with respect to the ink to be applied by the inking unit 07 to the printing material 09 depends on those data which are supplied to the control device 12 by the detection device 11, the measured values acquired by the detection device 11 must be unadulterated and reliable Otherwise, unrecognized falsified measured values lead involuntarily to an undesired control behavior of the control device 12, which is detrimental to the print quality desired in the production process.
- the control device 12 determines in a measuring field 13 primary color density to at least one at the same measuring point, ie in the same measuring field 13 in particular simultaneously determined secondary color density and / or determined in a color zone 22 of the respective inking 07 color density on their relation to at least one adjacent color zone 22nd the same inking 07 determined color density checks.
- at least two of the plausibility of the detected measured value relevant tests are performed by the control device 12 simultaneously.
- the control device 12 suspends a pending change in the setting of the relevant inking unit 07, in particular if at least one of the checks with respect to the plausibility of the detected measured value leads to a negative result, ie the relevant measured value concerned by the control device 12 as implausible to discard and for the color control is not to be used.
- the control device 12 z. B. an acoustic and / or optical warning message sent to a belonging to the printing press console. It is irrelevant whether the measured value to be checked for plausibility is recorded densitometrically or colorimetrically. As described above, the measured value to be checked for plausibility is z. B. detected with a camera, in particular a line scan camera. In a preferred embodiment, at least one of the plausibility of the measured value concerned tests in their test criteria z. B. on the press belonging to the control station and / or on another connectable to the printing machine control unit parameterizable.
- the color control z. B also a method for testing at least one measured value determined in a printing machine on its plausibility, in which the measured value indicates a color density of a printed on a printing substrate 09 transported ink, wherein on the substrate 09 a plurality of different printing inks are applied , wherein these printing inks applied to the printing material 09 are simultaneously detected by a detection device 1 1 having at least one image sensor 24, wherein the detection device 1 1 provides electronic, in particular digital image data at its output, this image data being connected to a recording device 1 1, z.
- electronic control device 12 are evaluated, wherein from the control device 12 supplied image data of the respective measured value of the color density of several of the applied on the substrate 09 printing in particular programmatically, d.
- the plausibility of the at least one measured value of the color density of at least one of the printing inks determined on the basis of its qualitative and / or quantitative ratio to the respective at least one likewise determined measured value of the color density of at least one colorant is determined by using special filtering and / or calculating methods the other inks is tested.
- the controller 12 checks using the detector 1 1 additionally or alternatively, the remission behavior of the surface of the unprinted substrate 09 z. B. in conjunction with a method for automatic color control in a running printing process within the printing press, wherein the printing substrate 09 is continuously printed in the printing process performed with the printing machine, wherein a measurement of a remission behavior of the ink applied to the printing substrate 09 ink is evaluated , wherein at least one of the remission behavior of the ink detected reading is evaluated with reference to the remission behavior of the surface of the unprinted substrate 09 and used for the color control, the remission of the surface of the unprinted substrate 09 assuming unchanged material properties of the substrate used in the printing process 09 is checked for its stability during the current printing process of the printing machine, wherein in a control device 12 of the color control as a reference value with the draw the reproducible behavior of the surface of the unprinted printing substrate 09 is continuously measured during the printing process of the printing press, wherein the measured values recorded thereby are checked for a deviation from the measured value previously set
- reference values derived from other measurement fields 13 would also lead to a falsified result based on this reference value.
- the measurement of the remission behavior of the surface of the printed and / or unprinted printing substrate 09 takes place in each case z. B. densitometric or colorimetric.
- the printing substrate 09 is preferably continuously printed in a printing process performed with the printing press.
- the remission behavior of the surface of the unprinted printing material 09 is preferably continuously measured at a plurality of different measuring points of the surface of this printing material 09.
- the remission behavior of the surface of the unprinted printing material 09 could also be measured in a printed image 21 produced by the printing machine during its printing process on the printing substrate 09.
- the remission behavior of the surface of the unprinted printing material 09 is measured outside a printed image produced by the printing machine during its printing process on the printing substrate 09.
- a substrate 09 z. B. printed a sequence of sheet 09.
- the remission behavior of the surface of the unprinted printing material 09 is measured in at least one measuring field 13 of a color measuring strip 19 created by the printing press during its printing process on the printing material 09, preferably in several of its measuring fields 13.
- deviating from the reference value measured values - triggered z. B. by a remote from the control device 12 signal - suspend an application of the color control method used in the printing press. Again, leave from the reference value deviating measured values on the printing machine and / or on a control room belonging to this printing machine z. B. make an audible and / or visual warning. As described, at least the remission behavior of the surface of the unprinted printing material 09 z. B. detected with a line camera.
- a color density of one of the on the transported by the printing machine substrate 09 printing ink representing measured value are thereby checked for plausibility that a qualitative and / or quantitative ratio of at least one measured value of one of the at color density determined at the relevant measuring point to the respective at least one measured value of at least one of the other color densities also determined there, and monitored.
- at least that measured value of the relevant color density is rejected as implausible, which is related to the measured value of the at least one other color density determined at the selected measuring point in a ratio deviating from a reference ratio predetermined for the selected measuring point.
- Fig. 3 sends the arranged in or on the press, cooperating with the detection device 1 1 lighting device 18 z. B. white light on a arranged on the surface of the printing material 09 with at least one of the inks printed measuring point, which z. B. is given by one of the measuring fields 13 in the measuring strip 19.
- the detection device 1 1 detects with its at least one sensor 24 remitted from this measuring point light.
- the detection device 1 1 more, z. B. three sensors 24, each of these sensors 24 the respective Remissions is associated with one of the in the current printing process printed inks. So z. B.
- the detection device 1 1 provides at its output at least one measured value indicating the color density of one of the detected at the measuring point inks.
- the respective color density of the three printing inks cyan, magenta and yellow present at the same measuring point is preferably detected simultaneously by the detection device 11. Also, measured values assigned to the respective printing ink in a running printing process are preferably recorded continuously.
- z. B. cyan associated with a solid field measuring field 13 is a color density z for this ink. B. in the range between 1, 3D and 1, 6D, preferably z. B. 1, 5D expected.
- cyan forms a primary color density or main density.
- the secondary density magenta is in this measurement field 13 according to a previously made determination not more than z. B.
- the optical density z. B. 60% of the main density, resulting in a value of the optical density z. B. between 0.75D and 1, 0D, which in this example, a first reference ratio between the main density cyan and the minor density magenta is formed.
- its measured value z. B. is not more than 30% of the main density, which corresponds to a value of the optical density z. B. between 0.35D and 0.5D, which is then formed in this example, a second reference ratio between the main density cyan and the secondary density yellow.
- similar measuring fields 13 can be used with respect to their measuring fields 13, which are preferably in the form of solid-color fields 13, but different in numerical value Definitions are made.
- a preferably parameterizable setting matrix which z. B. at one belonging to the printing press control station and / or at another connectable to the printing machine control unit is input and / or adjustable, wherein the respective values of the secondary densities z. B. are shown in each case based on the respective main density.
- the measured value determined in a running printing process for the respective printing inks determine the respectively previously defined relations to one another, d. H. do not exceed their respective reference ratios, then the measured value determined as the main density with respect to a specific measuring field 13 should be considered as plausible and thus usable again. Otherwise, an at least one of the established relations of non-adhering measured value of a main density for an in-line color control is not used, but discarded by the control device 12, i. H. the regulating device 12 does not make any change in the setting of the metering device of the inking unit 07 on the basis of a measured value which does not comply with at least one reference ratio.
- Ink zones 22 (FIGS. 2 and 4) with impermissibly high secondary densities can be registered by the control device 12 for later evaluation and determination of the cause of the malfunction.
- the predetermined for the selected measuring point reference ratio is preferably adjustable. This evaluates at least one relation between a main density and at least one secondary density Method can detect the extent to which an ink involved in the printing process z. B. by cloning, lubrication, color degradation in the inking unit 07 or other pollution is impaired in their usefulness.
- the examination of a determined color density for its plausibility is automated in the color control method used in the printing machine, that is performed without any action by an operator of the printing press.
- Another plausibility check of measured values relates to a test in a z. B. measured by the control device 12 selected color zone 22 of the inking unit concerned 07 measured value of a color density to a change in its relation to a determined in at least one adjacent color zone 22 of the same inking unit 07 measured value of the color density.
- ink i which is registered by its metering device is i. d. R.
- FIG. 4 shows a detail of a printed sheet 09, on which a measuring strip 19 running orthogonal to its transport direction T is applied (FIG. 2).
- a measuring strip 19 running orthogonal to its transport direction T is applied (FIG. 2).
- the four color zones 22A exemplified; 22B; 22C; 22D, each color zone 22A; 22B; 22C; 22D in the measuring strip 19 each have a plurality of juxtaposed measuring fields 13, wherein z.
- Each in one of the color zones 22A; 22B; 22C; 22D arranged measuring fields 13 each associated with a specific ink involved in the printing process and z.
- B. is formed as a solid field 13.
- One of the color zones 22A; 22B; 22C; 22D arranged measuring fields 13 can also be formed in each case as a white field 23 (Fig. 2).
- the z. B. in the color zone 22B in the measured field associated with a particular ink measuring field 13 measured value for their color density with the measured value in a relation set in the relevant field of view 13 for the color density of the same ink z. B. in the color zone 22A or 22C is determined.
- the measured value for their color density determined in the selected ink zone 22B for a particular ink is judged to be plausible by the control device 12, whereas in the case of exceeding or falling below at least one limit, ie a predetermined, z , B. in the control device 12 stored limit value, impermissibly changed relation of the currently determined measured value is not used for the color control, especially not for inline color control, the color control causes a tracking of the setting of the metering of the respective inking unit 07.
- the currently determined measured value is rejected by the control device 12 as unusable for the color control, in particular for the in-line color control.
- the control device 12 substitutes a value for the color density of the relevant printing ink on the basis of the ink from the adjacent color zones 22A; 22C determined measured values z. B. calculated by interpolation or extrapolation.
- Forming relations of the measured values of color densities between different color zones 22; 22A; 22B; 22C; 22D is not on immediately adjacent color zones 22A; 22B; 22C, but may also be spaced apart from one another, e.g. B. in the same measuring strip 19 more distant color zones 22D be extended.
- forming relationships of the color density measurements between different color zones 22; 22A; 22B; 22C; 22D can be parameterized at a control station belonging to the printing machine and / or at another operating unit which can be connected to the printing machine, ie the relation of the measured values for color densities between different ink zones 22 to be formed; 22A; 22B; 22C; 22D can be parameterized at a control station belonging to the printing machine and / or at another operating unit which can be connected to the printing machine.
- the control console and / or on the control unit z.
- a condition may be set using a program mask displayed on a display device, the condition requiring that the color zones 22; 22A; 22B; 22C; 22D in each case supply a majority of the measured values for the color density of an ink provided by this inking unit 07, which contains at least a predetermined fraction of the ink in the respective ink zone 22; 22A; 22B; 22C; 22D pre-set, ie by the z. B. made by the control device 12 setting predetermined target value, z. B. at least 25%, in particular at least 50% each of this setpoint. This may mean that only in over 50%, z. B.
- the respective color density in each case preferably at least half the value of that for the respective ink zone 22; 22A; 22B; 22C; 22D has to reach the preset target value before the control device 12 begins, one in the respective ink zones 22; 22A; 22B; 22C; 22D for the color density measured value to check its plausibility.
- the aforementioned condition in the then running printing process of the printing press is with respect to a selected color zone 22; 22B their measured value for a color density with a measured value from at least one other color zone 22 belonging to the same inking unit 07; 22A; 22C; 22D is related to form a relation, wherein the measured value for the color density in the selected color zone 22; 22B is then rejected as implausible if the relationship formed differs by more than 50% from its expected preset value.
- a color zone 22; 22A; 22B; 22C; 22D with a color density value which is rejected as implausibly is preferably registered in the control device 12.
- each of the color zones belonging to a particular inking unit 07 22; 22A; 22B; 22C; 22D are selected, wherein of the control device 12 more or all of these color zones 22; 22A; 22B; 22C; 22D are each selected either one at a time or simultaneously in parallel processes.
- both sides of the selected color zone 22; 22B respectively at least two further ink zones 22; 22A; 22C; 22D used.
- a color controller ie in a color controller 12 in a printing press, individually or in any combination.
- the color control can be configured in such a way that it only starts after the application of printing ink to the printing material 09 has stabilized, ie a certain degree of set values previously set for the color density of the respective printing ink has been reached, this being carried out on the basis of nominal values Stability test on individual selected ink zones 22; 22A; 22B; 22C; 22D or a group of selected color zones 22; 22A; 22B; 22C; 22D.
- a white value which results from a test of the unprinted printing material 09 and on the test Measured values obtained from bright colors are referred to as a zero mark for their respective color density, is stable in the current production or changes in an inadmissible way. Overall, a very stable control behavior is achieved with the described method for a performed in a running printing press color control, which helps to produce printed products of high quality in a running in a printing press printing process.
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200810041429 DE102008041429B4 (de) | 2008-08-21 | 2008-08-21 | Verfahren zur Prüfung zumindest eines in einem laufenden Druckprozess einer Druckmaschine ermittelten Messwertes auf seine Plausibilität |
PCT/EP2009/060419 WO2010020566A1 (de) | 2008-08-21 | 2009-08-12 | Verfahren zur prüfung von mindestens einem in einer druckmaschine ermittelten messwert auf seine plausibilität |
Publications (2)
Publication Number | Publication Date |
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EP2313272A1 true EP2313272A1 (de) | 2011-04-27 |
EP2313272B1 EP2313272B1 (de) | 2015-03-11 |
Family
ID=41278811
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP09781736.5A Not-in-force EP2313272B1 (de) | 2008-08-21 | 2009-08-12 | Verfahren zur prüfung von mindestens einem in einer druckmaschine ermittelten messwert auf seine plausibilität |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2313272B1 (de) |
DE (1) | DE102008041429B4 (de) |
WO (1) | WO2010020566A1 (de) |
Cited By (5)
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US11283936B1 (en) | 2020-12-18 | 2022-03-22 | Ricoh Company, Ltd. | Ink usage estimation for each drop size based on histogram and calibrated drop fraction |
US11731420B1 (en) | 2022-03-14 | 2023-08-22 | Ricoh Company, Ltd. | Drop size monitoring mechanism |
US11738552B2 (en) | 2021-02-02 | 2023-08-29 | Ricoh Company, Ltd. | Ink model generation mechanism |
US11745501B1 (en) | 2022-02-11 | 2023-09-05 | Ricoh Company, Ltd. | Drop size monitoring mechanism |
US11755865B1 (en) | 2022-03-01 | 2023-09-12 | Ricoh Company, Ltd. | Drop size monitoring mechanism |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016203635B4 (de) | 2016-03-07 | 2022-06-15 | Koenig & Bauer Ag | Verfahren zum Betreiben einer Druckmaschine |
US11182113B2 (en) | 2020-02-28 | 2021-11-23 | Ricoh Company, Ltd. | Ink deposition monitoring mechanism |
US10902304B1 (en) | 2020-02-28 | 2021-01-26 | Ricoh Company, Ltd. | Optical density monitoring mechanism |
US11247454B2 (en) | 2020-02-28 | 2022-02-15 | Ricoh Company, Ltd. | Uncalibrated ink deposition generation mechanism |
US11155099B2 (en) | 2020-02-28 | 2021-10-26 | Ricoh Company, Ltd. | Printer density control mechanism |
US10990863B1 (en) | 2020-02-28 | 2021-04-27 | Ricoh Company, Ltd. | Direct deposit ink estimation mechanism |
US11475260B2 (en) | 2021-02-02 | 2022-10-18 | Ricoh Company, Ltd. | Ink model generation mechanism |
US11570332B2 (en) | 2021-02-25 | 2023-01-31 | Ricoh Company, Ltd. | Color space ink model generation mechanism |
US11675991B1 (en) | 2022-03-04 | 2023-06-13 | Ricoh Company, Ltd. | Color space ink model generation mechanism |
US11973919B2 (en) | 2022-03-04 | 2024-04-30 | Ricoh Company, Ltd. | Color space ink model generation mechanism |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
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DE3543444A1 (de) * | 1985-03-21 | 1986-10-30 | Felix Corippo Brunner | Verfahren und regelvorrichtung zur erzielung eines gleichfoermigen druckresultats an einer autotypisch arbeitenden mehrfarbendruckmaschine |
DE29916379U1 (de) * | 1999-09-17 | 1999-12-09 | MAN Roland Druckmaschinen AG, 63075 Offenbach | Vorrichtung zum densitometrischen Ausmessen von Druckprodukten |
KR20040053110A (ko) * | 2001-10-15 | 2004-06-23 | 도판 인사츠 가부시키가이샤 | 인쇄 방법, 인쇄물 및 인쇄 제어 장치 |
DE102004003612B4 (de) * | 2004-01-25 | 2015-01-08 | grapho metronic Meß- und Regeltechnik GmbH | Verfahren und Auswertung eines Bildes von einem vorbestimmten Ausschnitt eines Druckerzeugnisses |
CN101090821B (zh) | 2004-03-23 | 2010-11-03 | 柯尼格及包尔公开股份有限公司 | 具有至少一个可利用执行机构调节的机器部件的印刷机 |
-
2008
- 2008-08-21 DE DE200810041429 patent/DE102008041429B4/de not_active Expired - Fee Related
-
2009
- 2009-08-12 WO PCT/EP2009/060419 patent/WO2010020566A1/de active Application Filing
- 2009-08-12 EP EP09781736.5A patent/EP2313272B1/de not_active Not-in-force
Non-Patent Citations (1)
Title |
---|
See references of WO2010020566A1 * |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11283936B1 (en) | 2020-12-18 | 2022-03-22 | Ricoh Company, Ltd. | Ink usage estimation for each drop size based on histogram and calibrated drop fraction |
US11738552B2 (en) | 2021-02-02 | 2023-08-29 | Ricoh Company, Ltd. | Ink model generation mechanism |
US11745501B1 (en) | 2022-02-11 | 2023-09-05 | Ricoh Company, Ltd. | Drop size monitoring mechanism |
US11755865B1 (en) | 2022-03-01 | 2023-09-12 | Ricoh Company, Ltd. | Drop size monitoring mechanism |
US11731420B1 (en) | 2022-03-14 | 2023-08-22 | Ricoh Company, Ltd. | Drop size monitoring mechanism |
Also Published As
Publication number | Publication date |
---|---|
WO2010020566A1 (de) | 2010-02-25 |
DE102008041429A1 (de) | 2010-02-25 |
EP2313272B1 (de) | 2015-03-11 |
DE102008041429B4 (de) | 2013-09-12 |
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