EP3539777B1 - Procédé et dispositif de correction d'une position d'impression d'un groupe d'impression ainsi que imprimante - Google Patents

Procédé et dispositif de correction d'une position d'impression d'un groupe d'impression ainsi que imprimante Download PDF

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Publication number
EP3539777B1
EP3539777B1 EP18161741.6A EP18161741A EP3539777B1 EP 3539777 B1 EP3539777 B1 EP 3539777B1 EP 18161741 A EP18161741 A EP 18161741A EP 3539777 B1 EP3539777 B1 EP 3539777B1
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EP
European Patent Office
Prior art keywords
printing
memory
value
correction
determined
Prior art date
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EP18161741.6A
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German (de)
English (en)
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EP3539777A1 (fr
Inventor
Miriam Neger
Jörg Reh
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Siemens AG
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Siemens AG
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Priority to EP18161741.6A priority Critical patent/EP3539777B1/fr
Priority to CN201910187997.9A priority patent/CN110271276B/zh
Priority to US16/353,147 priority patent/US10946637B2/en
Publication of EP3539777A1 publication Critical patent/EP3539777A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/02—Conveying or guiding webs through presses or machines
    • B41F13/025—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/10—Forme cylinders
    • B41F13/12—Registering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F33/00—Indicating, counting, warning, control or safety devices
    • B41F33/0081—Devices for scanning register marks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme

Definitions

  • the invention relates to a method for correcting a printing position of a printing unit according to claim 1. Furthermore, the invention relates to a device according to claim 11 and a printing machine according to claim 12.
  • a printed product such as a magazine, newspaper or packaging, is usually produced by means of a printing machine.
  • Printing machines are also used for functional printing and decor printing.
  • the printing press has at least one printing unit, which thus represents an assembly or component of the printing press.
  • the printing unit comprises a rubber or printing cylinder and often, for example, an inking and / or dampening unit. If the printed product or the printed copy is to be multicolored, so-called multicolor printing is used as the printing process. A color separation takes place in the individual printing inks, since the print image that is to be printed on a substrate in order to create the print product is broken down into basic colors and special colors.
  • Printing machines for multi-color printing therefore generally have a separate printing unit for each printing color.
  • four-color printing is broken down into the colors cyan, magenta, yellow and black.
  • the colors of the print image or thedazzlingness of the print image are determined by the composition of the printing inks.
  • a series construction is often used, that is, the individual printing units are arranged one behind the other.
  • the individual colors In order to obtain the highest possible quality of the printed product, the individual colors must be in a fixed, in particular exact, position can be printed one above the other, so that the print image is perceived particularly sharply.
  • Print marks are used in order to be able to measure the position of the printing inks relative to one another.
  • a so-called register which is also referred to as a register or color register and describes how the individual colors match in multi-color printing, can be checked.
  • the process colors or printing inks are printed one after the other and one above the other and / or next to one another and thus result in the complete print image. If the printing inks are not printed exactly on top of one another and / or next to one another, the printed image appears blurred or blurred or has color shifts which have a quality-reducing effect.
  • the print image is in register when the printing inks are exactly on top of each other. If this is not the case, one can speak of a so-called register or register error. If the printing machine is designed as a sheet-fed printing machine, this can arise, for example, from inaccurate transport of the sheet of printing material through the printing machine. Registration problems can also occur, for example, in a web press.
  • a register control is used, for which additional information, the print mark, is applied to the printing material by each printing unit. With the help of the respective print mark, the position of the individual print images printed in the respective color can be determined. For each print copy, a so-called brand field is printed which contains the individual print marks.
  • the offset of the individual print marks in the longitudinal and / or lateral direction is measured by a sensor unit.
  • an error is now calculated from a target position and an actual position of the print mark, which is corrected.
  • the prior art discloses two ways in which the problem is solved.
  • the first variant or the first type no further correction is carried out until the printed copy with the correction has arrived at the measuring point or the sensor unit.
  • a gain of the controller is reduced, so that a correction value, which regulates the print position of the print image in the printing unit, is calculated, which is smaller than the actual register error.
  • the two mentioned measures used in the prior art have the disadvantage that there is a particularly sluggish control behavior, which in particular becomes more sluggish the greater the distance between the printing unit and the sensor unit, i.e. between the printing point and the measuring point, becomes.
  • the US patent application US 2006/0236885 A1 shows a method for applying a register-keeping pattern to a continuous material web. A position is adjusted transversely to the web and the pattern is rotated so that it lies essentially along the longitudinal course of the web. As a result, patterns are applied to the web in register and follow an uneven web course.
  • a first aspect of the invention relates to a method for correcting a printing position of a printing unit.
  • the printing unit is a component or part of a printing machine that has at least one sensor unit.
  • the printing machine can, for example, produce a printed product by means of flexographic printing, gravure printing, screen printing, digital printing or offset printing.
  • the printing press can be, for example, both a printing press for roll printing and a printing press for sheet-fed printing. In principle, the printing press can be any printing press.
  • the method comprises several steps: In a first step or method step, an actual position of at least one print mark printed on the printing material by means of the printing unit is detected by means of the sensor unit. This means that the sensor unit is designed, for example by means of a sensor, to detect the actual position of the printed print mark on the printing material. In a second step of the method, a deviation of the recorded actual position from a target position is determined.
  • the deviation equals one Offset, in particular in the longitudinal direction and / or transverse direction, of the actual position of the print mark to the position required, in particular for a particularly high quality of the print product.
  • at least one difference value characterizing the deviation is determined.
  • This difference value can be, for example, a distance between the target position and the actual position.
  • the difference value can have a directional value, for example.
  • the difference value can also be represented as a vector, the amount of which is the distance between the setpoint and actual position.
  • a buffer value is determined from a number of support values previously stored in a memory.
  • the memory is, for example, a memory area of an electronic computing device in which a plurality of values, in particular support values, can or can be stored.
  • the supporting values stored in the memory are each determined individually to be zero, for example.
  • the first implementation of the method can be carried out, for example, when a pressure is started or the like.
  • the memory is preferably designed as a buffer memory, that is, it is used for intermediate storage of the support values and not for permanent storage of the support values.
  • a correction value is determined by subtracting the buffer value from the difference value.
  • the determined correction value is stored as one of the supporting values in the memory, that is to say the correction value is stored in the memory so that it can be used when the method is carried out again for forming or determining the buffer value.
  • the printing position is corrected on the basis of the correction value determined. This means that the printing unit is manipulated in such a way that the print position of the print image to be printed is on the Printing substrate is changed, in particular in such a way that the actual position was changed by at least the correction value for a future print. This changes a control difference which reflects the difference between the target position and the currently measured actual position.
  • each individual measured value of the respective actual position detected by the sensor unit can be used for correction and thus a respective register correction can be carried out for each printed copy.
  • the current correction value determined when the method is carried out is entered in the memory.
  • the current system deviation and the correction already in the route can be taken into account when determining or calculating the new, more current correction value.
  • the distance is to be understood as the path between the printing unit and the sensor unit, whereby the "correction in the path" is to be understood as the at least one former correction value stored in the memory as a reference value.
  • the respective support value is formed from a previous correction value determined in a previous implementation of the method. That is, if the method according to the invention is carried out at least a second time, for example, the correction value of the first execution becomes the support value of the second execution. If the method is repeated so often that the number of repetitions corresponds to the number of support values stored in the memory, the memory is completely filled with support values which are each formed from a correction value from one of the previous implementations of the method. An initialization of the support values with a predetermined value each, for example in the case of a new print job, is used to carry out the method until the support values can each be formed from a correction value.
  • each actual position detected by the sensor unit can be used for register control and thus for correction.
  • the register correction that is to say the correction of the printing position
  • the register correction can be carried out for each printed copy, that is to say for each individual printed product that is printed by the printing unit and conveyed or moved by the printing machine to the sensor.
  • dead time which is also called the running or transport time
  • the dead time depends on the known distance between the printing unit and the sensor unit, it can also be referred to as dead travel. Due to the dead travel, a correction that has already been carried out is not yet visible in the currently recorded actual position. However, this correction or the associated correction value is entered in the memory. If the method is now carried out again, the at least one current correction value of the correction carried out is taken into account when a new correction value is determined. For example, the correction can be carried out in a certain area so that the correction does not falsify the print marks.
  • a particularly advantageous register control for correcting the printing position of the printing unit can be implemented, in particular in the case of large distances between the printing unit and the sensor unit.
  • the register control can work particularly dynamically and stably, which means that, for example, overshoots can be avoided.
  • the reference value stored in the memory for the longest time in relation to the support values stored in the memory is deleted from the memory and replaced by the correction value determined.
  • the first time the Method each have support values initialized to zero.
  • the storage locations in the memory that is to say the areas in which a reference value is or can be stored, also have a fixed reference with regard to a time sequence.
  • the support values which are each formed from an old correction value or correspond to it, can be read out from the memory in such a way that the chronological sequence of their entry into the memory can be recognized. If a first correction value is now entered in the memory as a new reference value, the correction value which was last entered, before the first correction value, moves from a first memory location to a second memory location.
  • a correction value, which is in the last memory location, is deleted from the memory or removed and occupied by the reference value of the penultimate memory location, which becomes the last reference value of the memory when the new reference value is entered.
  • a current number of support values can be stored in the memory, which in particular consists of respective correction values, which in each case when the inventive Method generated, are held so that the correction of the printing position can be carried out particularly efficiently and / or particularly precisely. If the process has been repeated so often that the number of repetitions corresponds to the number of memory locations in the memory, the memory is completely filled with the most recent reference values.
  • the memory which can also be referred to as a buffer, is designed as a shift register.
  • a shift register the number of available memory locations in which a reference value can be stored is constant. Each time the shift register is written to, a reference value is shifted one memory location further, so that the first or stored single value leaves the memory first. Pushing in and out, or reading in and reading out, usually take place synchronously.
  • the number of support values stored in the memory is determined by a distance between a print location of the print mark in the printing unit and a read-out position of the sensor unit. This number is also determined by the format length of the printing material. The number is advantageously the rounded quotient of the distance and the format length.
  • the format length is the length which the printing material has along the direction in which the printing material can be or is transported through the printing machine and in particular through the printing unit.
  • the number of supporting values stored in the memory corresponds to the number of the following print copies: the print copy whose print mark is detected at a point in time by means of the sensor unit, the print copy which is printed at that point in time by means of the printing unit and the print copy or copies which is or are located in the printing machine at the time and was or were already being printed by means of the printing unit at the time, but not yet detected by means of the sensor unit.
  • the current correction value can be calculated particularly dynamically through the number of said printed copies, which corresponds to the number of support values stored in the memory.
  • an overshoot can be avoided, for example, since the control difference, the difference between the target position and the actual position, is due to the dead time or the dead path can be compensated for by the number of supporting values held, or the supporting values are taken into account when correcting the printing unit.
  • the number of print copies that have already been printed, but whose respective print mark has not yet been recorded is to be understood as such that, with continuous operation of the printing machine, corresponds to the number of print copies that are currently moving from the printing unit, for example by means of a conveyor, on the way to the sensor unit.
  • a number of printed copies, from which the actual position mean value or the mean value of the deviation values is formed can be referred to as a so-called filter depth.
  • the filter depth thus corresponds to the number of actual positions used to form the actual position mean value.
  • the number of support values stored in the memory corresponds to the sum of a first number and a second number.
  • the first number is determined by the distance between the printing location and the readout position and / or the format length of the printing material.
  • the first number is advantageously the rounded quotient of the distance and the format length.
  • the second number corresponds to the number of actual positions used to form the actual position mean value and thus the filter depth.
  • the number of support values stored in the memory corresponds to the sum of a first number and a second number.
  • the first number is the number of the following print copies: the print copy whose print mark is detected at a point in time by means of the sensor unit, the print copy which is printed at the point in time by means of the printing unit and the print copy or copies which are at the point in time is or are located in the printing machine and at that point in time was already being printed by means of the printing unit, but not yet being detected by means of the sensor unit.
  • the second number of the sum where the sum describes the number of storage locations, corresponds to the number of actual positions used to form the actual position mean value, that is to say the specified filter depth. This is based on the fact that the dead time or the dead path is lengthened in the case of averaging.
  • the correction of the printing position of the printing unit is regulated with the averaged or smoothed actual position or a specified filter depth and the extended dead path is not taken into account, this can lead to an incorrect calculation of the correction and thus to an unstable behavior of the regulation.
  • the correction is specified more precisely or the filter depth is taken into account in the correction, so that an unstable behavior of the control can be excluded.
  • the buffer value is determined as the sum of the support values.
  • the support values stored or stored in the memory which represent or are in particular the correction values determined at an earlier point in time, that is, when the method was carried out earlier, are added up, whereby the buffer value is formed or determined.
  • a current correction value can be determined particularly quickly and, for example, overriding the correction of the printing position of the printing unit can be kept particularly low.
  • At least one of the supporting values is weighted when determining the sum. That is to say, at least one of the support values is multiplied in particular by a scalar, so that this support value has a particularly large or a particularly small influence on the determination of the correction value compared to the other support values.
  • the last reference values can be weighted.
  • the last support values are to be understood as the support values that have already been passed through the memory so that they are in the last memory locations before leaving the memory, so that the last support values mentioned fall from the memory when a second number of new correction values are entered.
  • the mentioned last reference values are removed from the memory, with only the reference value in the last memory location from the memory per execution of the method falls.
  • the last reference value can be weighted with 0, the penultimate reference value with 1/3 and the penultimate reference value with 2/3.
  • the sensor unit has a camera sensor and / or fiber optics.
  • the print mark can be detected in a particularly advantageous manner and, in particular, read out for subsequent processing.
  • light which is reflected from the print mark can be guided in a particularly advantageous manner to a suitable sensor of the sensor unit through fiber optics, so that this light can be detected.
  • the sensor unit can be arranged relatively freely on or in the printing press.
  • the respective print mark can be detected using other techniques, such as a contrast scanner.
  • the sensor unit should be designed in such a way that it can provide sensor data from which the actual position can be determined or recorded by means of the method according to the invention.
  • paper and / or cardboard and / or plastic and / or metal and / or wood and / or glass is used as the printing material.
  • the printing material can be designed as a film, for example, which means that the material at least partially forming the printing material, in particular for example plastic and / or metal, is particularly thin.
  • the method can be used with other materials which are suitable for printing, so that the method can be carried out for a particularly large variety of printing machines and can thus be implemented for a particularly large number of different printed products.
  • the inventive Method applied and thus the correction of the printing position can be carried out particularly efficiently.
  • a second aspect of the invention relates to a device for correcting a printing position of a printing unit of a printing machine, with at least one electronic computing device, which is designed to determine an actual position of at least one print mark printed on a printing material by means of the printing unit using sensor data which is received by a sensor unit are received to capture. Furthermore, the electronic computing device is designed to calculate a deviation of the recorded actual position from a target position, at least one difference value characterizing the deviation, a buffer value from a number of support values previously stored in a memory and a correction value by subtracting the buffer value from the To determine the difference value. Furthermore, the electronic computing device is designed to store the correction value as one of the support values in a memory and to provide a signal for correcting the printing position based on the determined correction value, the printing position of the printing unit being able to be corrected by means of the signal.
  • Advantages and advantageous configurations of the first aspect of the invention are to be regarded as advantages and advantageous configurations of the second and / or third aspect of the invention and vice versa.
  • FIG 1 shows a schematic view of a printing press 10, which has a sensor unit 12 and at least one printing unit 14.
  • a printing press 10 which has a sensor unit 12 and at least one printing unit 14.
  • register errors can occur.
  • the individual printing inks are not exactly on top of one another, so that the finished printed copy or printed product appears, for example, blurred.
  • the register error can be compensated for particularly dynamically and thus efficiently, whereby the print image and thus the finished print copy or its individual colors are in register.
  • the method for correcting the printing position of the, in particular the respective, printing unit 14 of the printing press 10 having at least the sensor unit 12 comprises several steps: In a first step of the method, an actual position of at least one print mark 18 printed on the printing material 16 by means of the printing unit 14 is detected by means of the sensor unit 12. In a second step, a deviation of the recorded actual position from a target position is determined. In a third step, at least one difference value characterizing the deviation is determined. In a fourth step, a buffer value is determined from a number or a plurality of support values 22 previously stored in a memory 20. In a fifth step, a correction value is determined by subtracting the buffer value from the difference value. In a sixth step, the correction value determined in the fifth step is stored as one of the support values 22 in the memory. In a seventh In step 14, the printing position of the printing unit 14 is corrected on the basis of the correction value determined.
  • the printing machine 10 can, for example, print on packaging using what is known as flexographic printing.
  • the printing machine 10 can also be a printing machine which is designed for offset printing.
  • the printing material 16 or the printing materials 16 can be printed by means of, for example, roller printing or sheet printing.
  • the respective printing unit 14 advantageously has at least one printing cylinder 24 in each case.
  • the respective printing unit 14 can have, for example, a print head instead of the printing cylinder 24, as can be the case, for example, in digital printing.
  • the respective printing ink can be applied to the printing material 16 in a particularly advantageous manner by means of the respective printing cylinder 24 of the respective printing unit 14.
  • the printing material 16 is advantageously paper and / or cardboard and / or plastic and / or metal, as a result of which a particularly large variety of different printed products can be produced by means of the printing machine 10.
  • the printing press 10 has two printing units 14 arranged one after the other.
  • One form of multicolor printing is so-called four-color printing, in which the colors cyan, magenta, yellow and black are used in particular to produce colored printed products.
  • four printing units 14 would thus be provided; for the sake of simplicity, FIG FIG 1 however, only two printing units 14 are shown.
  • the number of printing units 14 of the printing press 10 can be freely selected.
  • the sensor unit 12 advantageously has a camera sensor and / or fiber optics, as a result of which the respective print mark 18 can be or can be detected particularly easily by the sensor unit 12.
  • a distance between the printing units 14 and the sensor unit 12 is a certain length.
  • This length can, for example, as in FIG 1 shown, the length of two printing materials 16 are.
  • the print mark 18 printed at the first point in time is only detected by the sensor unit 12 at a later third point in time.
  • the interval between the point in time and the second or third point in time is called the dead time. This can also be interpreted or understood as a dead path.
  • a print copy 26 is between the last printing printing unit 14 (the right printing unit 14 of the FIG 1 ) and the sensor unit 12 in the printing press 10. This means that by the time the sensor unit 12 gets to see a printed copy 26 or the printing material 16, which was printed by the last printing unit 14, two further printed copies 26 have already been printed by this printing unit 14.
  • the respective print mark 18 can, as shown in the example, be formed from individual rectangles or triangles, with at least one rectangle or at least one triangle being provided for each color to be printed.
  • the method is fundamentally independent of the expression of the print marks 18. For the process, measured values only need to be available at a defined point in time.
  • the last printing unit 14 is designed to be used in the FIG 1 left triangle of print mark 18 to print.
  • the print marks for example, dots in the respective printing color.
  • the rectangular and triangular design of the print marks 18 or the mark fields has become established, so that these are designed as wedge or block marks, whereas so-called point marks are often used for camera-based sensor units 12.
  • FIG 2 shows a schematic flowchart of an embodiment of the method for correcting the printing position of the, in particular the respective, printing unit 14 of the printing press 10.
  • the memory 20 is advantageously designed as a shift register so that a support value written into the memory 20 when a further support value 22 is added again by the memory or shift register is passed and leaves it after reaching a last memory position of the memory 20.
  • a shift register By using a shift register, a fixed time reference of the support value 22 to the respective acquisition time, for example the first time, can be established in a particularly simple manner, whereby a time sequence of the support values 22 in the memory 20 can be realized.
  • the support value 22 stored in the memory 20 for the longest time in relation to the support values 22 stored in the memory 20 can be deleted from the memory and replaced by the correction value determined by the current repetition of the method as the new or current support value 22 .
  • the memory 20 as a shift register, there is an association between one of the memory positions and a time sequence of the repetitions of the method.
  • the respective individual print copies 26 or printing materials 16 coming from the right are successively printed by the printing unit 14 and then the print marks 18 are printed by the sensor unit 12 recorded.
  • the sawtooth-like line 27 indicates the respective position of a guide axis of the printing unit 14 or of the printing cylinder 24. This means that after one complete revolution of the pressure cylinder 24, the guide axis has returned to its original position.
  • the method is carried out for the first time when the first print copy 26 or its print mark 18 is detected by the sensor unit 12.
  • the memory 20, the memory size 28 of which in the example shown comprises a number of three memory locations, which is represented by the left curly brackets, corresponds to the number which is specified, among other things, by the distance or the dead travel between the printing unit 14 and the sensor unit 12.
  • the number is determined by the number of the following print copies 26, 30, 32: the print copy 26, the print mark 18 of which is detected at a point in time by the sensor unit 12, the further print copy 30 which is printed at the point in time by the printing unit 14 and the printed copy 32 or the printed copies 32, which is or are located in the printing machine 10 at the time and was or were already being printed by the printing unit 14 at the time, but not yet detected by the sensor unit 12.
  • the number of support values 22 stored in the memory is determined by a distance 42 between a printing location of the printing mark 18 in the printing unit 14 and a read-out position of the sensor unit 12.
  • This number is also determined by a format length 40 of the printing material. The number is the rounded up quotient from the distance 42 and the format length 40.
  • a time axis 34 is defined with respect to the line 27, which determines the position of the master axis.
  • the position of the master axis is shown in a second axis 36 perpendicular thereto.
  • a difference value characterizing the deviation is determined from this deviation.
  • a buffer value is determined from a number of support values 22 previously stored in memory 20.
  • the buffer value is 0, since no correction has yet been carried out before the method was carried out for the first time.
  • the correction value is formed from the buffer value by subtracting the buffer value from the difference value.
  • the determined correction value is stored as one of the support values 22 in the memory 20.
  • the first correction value KORR1 is stored in the memory and the third print mark 18, that is to say the print mark 18 of the print copy 30, is printed but not yet measured.
  • the steps of the method are carried out again, so that at time ZP4, at which the fourth print mark 18 was printed on a further print copy, a new correction value KORR2 is the new one Support value 22 was written or is being written into memory 20.
  • the print mark of the print copy 30 is measured and the method is carried out again a third time, so that the correction value KORR3 is already entered in the memory 20 at the point in time ZP6, at which a fifth print mark 18 is printed is.
  • the fourth print mark 18 printed is detected and the method is carried out again, so that at the point in time ZP8, at which the sixth print mark 18 is printed, the fourth correction value KORR4 is entered in memory 20.
  • the memory 20 is filled for the first time with support values 22 formed by earlier implementation of the method and formed from the correction values KORR1 to KORR3, so that the correction value KORR1 written in the memory at time ZP1 or time ZP2 is pushed out of memory area 28.
  • the method is started repeatedly at times ZP9 and ZP11, since the first method step is carried out at the respective time. In each case at time ZP10 or time ZP12, the method is run through completely and a further print mark 18 is printed in each case.
  • the buffer value is formed from the sum of the support values 22 stored in memory 20 with memory size 28, which are formed from respective correction values (KORRn to KORRn + 2) for a respective implementation of the method. This buffer value, updated each time the method is carried out, is subtracted from the current difference value characterizing the deviation.
  • the memory size 28 is also referred to as the memory depth.
  • the method can alternatively be carried out in such a way that several actual positions of respective print marks 18 printed on respective printing materials 16 by means of the printing unit 14 are detected by means of the sensor unit 12, an actual position mean value being formed from the several actual positions and the difference value is determined by means of the actual position mean value.
  • the actual positions can first be recorded and averaged and the deviation of the target position from the averaged actual position or the actual position mean value can be determined.
  • a filter depth which, in the example, corresponds to three, that is to say the number of checked print marks 18 used for averaging.
  • the filter depth is equal to the number of the Actual position mean actual positions used.
  • the memory size 28, i.e. the number of memory locations that can be kept in the memory 20, is advantageously increased by the number of those for formation actual positions used for the average actual position.
  • the additional support values 22 are weighted and taken into account when determining the buffer value by the sum of the support values 22.
  • the expanded memory size 28 of the memory 20 designed as a shift register can additionally hold support values 22 which are taken into account by the weighting in the formation of the buffer value.
  • the method can regulate print marks 18 in a particularly efficient and / or dynamic manner by means of a memory 20, in particular designed as a shift register, and thus lead to print copies 26, 30, 32 that are qualitatively particularly precisely printed, with a smoothing of the actual position can be carried out.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Claims (12)

  1. Procédé pour corriger une position d'impression d'un groupe d'impression (14) d'une machine d'impression (10) dotée d'au moins une unité de capteur (12), comprenant les étapes suivantes :
    - détection, au moyen de l'unité de capteur (12), d'une position réelle d'au moins une marque d'impression (18) imprimée au moyen du groupe d'impression (14) sur un support d'impression (16),
    - détermination d'un écart entre la position réelle détectée et une position de consigne,
    - détermination d'au moins une valeur de différence caractérisant l'écart,
    - détermination d'une valeur de correction,
    - correction de la position d'impression en fonction de la valeur de correction déterminée,
    caractérisé par les étapes suivantes :
    - détermination d'une valeur tampon à partir d'un certain nombre de valeurs de support (22) précédemment stockées dans une mémoire (20),
    - détermination de la valeur de correction en soustrayant la valeur tampon de la valeur de différence, et
    - enregistrement de la valeur de correction déterminée en tant qu'une des valeurs de support (22) dans la mémoire (20) .
  2. Procédé selon la revendication 1, caractérisé en ce que la valeur de support (22) stockée depuis le plus longtemps dans la mémoire (20) parmi les valeurs de support (22) stockées dans la mémoire (20) est effacée de la mémoire (20) et remplacée par la valeur de correction déterminée.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que la mémoire (20) est configurée sous forme d'un registre à décalage.
  4. Procédé selon l'une des revendications précédentes, caractérisé en ce que le nombre de valeurs de support (22) stockées dans la mémoire (20) est déterminé par :
    - une distance (42) entre un emplacement d'impression de la marque d'impression dans le groupe d'impression et une position de lecture de l'unité de capteur et/ou
    - une longueur de format (40) du support d'impression (16) .
  5. Procédé selon l'une des revendications précédentes, caractérisé en ce que plusieurs positions réelles de marques d'impression (18) respectives imprimées sur des supports d'impression (16) respectifs au moyen du groupe d'impression (14) sont détectées au moyen de l'unité de capteur (12), dans lequel une valeur moyenne de position réelle est formée à partir des plusieurs positions réelles et la valeur de différence est déterminée au moyen de la valeur moyenne de position réelle.
  6. Procédé selon la revendication 5, caractérisé en ce que le nombre des valeurs de support (22) stockées dans la mémoire (20) correspond à la somme d'un premier nombre et d'un second nombre, dans lequel le premier nombre est déterminé par :
    - la distance (42) entre l'emplacement d'impression et la position de lecture et/ou
    - une longueur de format (40) du support d'impression (16),
    et le second nombre correspond au nombre de positions réelles utilisées pour former la valeur moyenne de position réelle.
  7. Procédé selon l'une des revendications précédentes, caractérisé en ce que la valeur tampon est déterminée en tant qu'une somme des valeurs de support (22).
  8. Procédé selon la revendication 7, caractérisé en ce qu'au moins une des valeurs de support (22) est pondérée pour déterminer la somme.
  9. Procédé selon l'une des revendications précédentes, caractérisé en ce que l'unité de capteur (12) comprend un capteur de caméra et/ou un dispositif à fibre optique.
  10. Procédé selon l'une des revendications précédentes, caractérisé en ce qu'en tant que support d'impression (16), on utilise du papier et/ou du carton et/ou une matière plastique et/ou du métal et/ou du bois et/ou du verre.
  11. Dispositif pour corriger une position d'impression d'un groupe d'impression (14) d'une machine d'impression (10), comprenant au moins un dispositif de calcul électronique, qui est configuré pour :
    - détecter une position réelle d'au moins une marque d'impression (18) imprimée au moyen du groupe d'impression (14) sur un support d'impression (16) sur la base de données de détection reçues depuis une unité de capteur (12),
    - déterminer un écart entre la position réelle détectée et une position de consigne,
    - déterminer au moins une valeur de différence caractérisant l'écart,
    - déterminer une valeur de correction,
    - fournir un signal de correction de la position d'impression en fonction de la valeur de correction déterminée,
    caractérisé en ce que le au moins un dispositif de calcul électronique est configuré en outre pour :
    - déterminer une valeur tampon à partir d'un certain nombre de valeurs de support (22) stockées précédemment dans une mémoire (20),
    - déterminer la valeur de correction en soustrayant la valeur tampon de la valeur de différence, et
    - enregistrer la valeur de correction en tant qu'une des valeurs de support (22) dans une mémoire (20).
  12. Machine d'impression (10) comprenant un dispositif selon la revendication 11.
EP18161741.6A 2018-03-14 2018-03-14 Procédé et dispositif de correction d'une position d'impression d'un groupe d'impression ainsi que imprimante Active EP3539777B1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP18161741.6A EP3539777B1 (fr) 2018-03-14 2018-03-14 Procédé et dispositif de correction d'une position d'impression d'un groupe d'impression ainsi que imprimante
CN201910187997.9A CN110271276B (zh) 2018-03-14 2019-03-13 用于校正印刷机构的印刷位置的方法和设备以及印刷机
US16/353,147 US10946637B2 (en) 2018-03-14 2019-03-14 Printing press, method and apparatus for correcting a printing position of a printing unit

Applications Claiming Priority (1)

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EP18161741.6A EP3539777B1 (fr) 2018-03-14 2018-03-14 Procédé et dispositif de correction d'une position d'impression d'un groupe d'impression ainsi que imprimante

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DE102020123472A1 (de) 2020-09-09 2022-03-10 Koenig & Bauer Ag Verfahren zum Kontrollieren der Qualität von Druckprodukten
CN112537148A (zh) * 2020-09-30 2021-03-23 湖北合信智能包装科技有限公司 一种数字印刷与柔版印刷色彩匹配的方法
CN112918064B (zh) * 2021-01-25 2022-09-30 珠海市旺林包装材料有限公司 一种含追踪编码的包装膜及其印刷编码方法
CN113211981A (zh) * 2021-06-09 2021-08-06 北京印刷学院 一种数码印刷偏差修正装置及方法

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EP3539777A1 (fr) 2019-09-18
CN110271276B (zh) 2021-07-27
US20190283396A1 (en) 2019-09-19
CN110271276A (zh) 2019-09-24
US10946637B2 (en) 2021-03-16

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