EP2520430B1 - Method for detecting configuration errors in a sheet printing device - Google Patents

Method for detecting configuration errors in a sheet printing device Download PDF

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Publication number
EP2520430B1
EP2520430B1 EP20120165476 EP12165476A EP2520430B1 EP 2520430 B1 EP2520430 B1 EP 2520430B1 EP 20120165476 EP20120165476 EP 20120165476 EP 12165476 A EP12165476 A EP 12165476A EP 2520430 B1 EP2520430 B1 EP 2520430B1
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EP
European Patent Office
Prior art keywords
sheet
printing
contour
imaging
printing press
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Active
Application number
EP20120165476
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German (de)
French (fr)
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EP2520430A1 (en
Inventor
Stefan Billmaier
Werner Huber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Publication date
Priority to DE102011100413A priority Critical patent/DE102011100413A1/en
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP2520430A1 publication Critical patent/EP2520430A1/en
Application granted granted Critical
Publication of EP2520430B1 publication Critical patent/EP2520430B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/04Tripping devices or stop-motions
    • B41F33/14Automatic control of tripping devices by feelers, photoelectric devices, pneumatic devices, or other detectors
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F21/00Devices for conveying sheets through printing apparatus or machines
    • B41F21/12Adjusting leading edges, e.g. front stops
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F21/00Devices for conveying sheets through printing apparatus or machines
    • B41F21/14Adjusting lateral edges, e.g. side stops

Description

  • The invention relates to a method for determining Einstellfehlem in a sheetfed press, wherein the geometry of the continuous sheet is recorded by an imaging system and compared for evaluation with target geometries.
  • It has been known for some time, in the printing of sheet-fed printing machines imaging systems such. As video cameras or line sensors to provide, of which images of the undergoing sheets are obtained inline and evaluated for various purposes. Main applications here are on the one hand, the color control or color control due to detected spectral color differences in the subject to the target image, as well as the detection of errors in the printed image, such. B. slugs or scratches. In this second case, the quality assurance imaging system is used to identify the sheets or portions thereof that are unsortable and possibly to be discarded. Again, the subject is compared with an error-free reference.
  • Furthermore, it is known to detect with cameras or sensors, the position of the sheets transported in sheetfed presses to detect register errors at different points of the machine and possibly correct by displacement of stops, grippers, etc. (oblique sheet correction, page register, circumferential register). Such systems that evaluate the position of sheet edges, for example, in the EP 1 952 986 A1 , of the DE 199 10 244 A1 , of the DE 14 64 66 A1 as well as the DE 10 2006 061 431 A1 described.
  • From the DE 197 47 728 It is known to make deformations or relative movements of the printing material as it passes through the printing machine in the form of schematic illustrations visible. For this purpose, several measuring fields of differently colored partial measuring elements are exposed on specially for this purpose Placed printing plates and then recorded the differently colored printed fields in their position to each other by a video camera and evaluated in order to conclude from problems in the passage of the sheet through the printing press.
  • Special printing plates are required in this process and paper must be printed to detect the errors that occur during sheet travel by evaluating the printed sheets.
  • In the DE 103 12 162 A1 as well as the EP 1 155 854 A2 are means for monitoring the sheet travel described with which the sheet travel is spatially monitored by cameras that look laterally on the sheet edge and thereby determine, for example, whether the continuous sheet remains within predetermined boundary positions at a distance from the cylinder surface and the sheet guiding devices. These monitoring devices are thus designed specifically for the one purpose they serve, namely to determine the spatial position of the sheet, and can not be used to determine other setting errors z. B. be used on the gripper bar. Furthermore, from the US 7,478,806 B2 a moving mitbewegter with the sensor sensor detects the position and inclination of the sheet in space and in the US 7,481,429 B2 a signal processing electronics for sheet sensors is described.
  • It is the object of the invention to specify a method with which adjustment errors in the printing units of a sheet-fed printing machine can be detected in a simple manner with an imaging system oriented substantially perpendicular to the sheet surface.
  • This object is achieved with the measures specified in claim 1.
  • According to the invention, in contrast to the known solutions, the visible contours of the sheet edges are at least partially detected by the imaging system directed onto the sheet surface, and the deviations of the sheet contours or contour pieces are measured to the desired contours of the ideally rectangular arc. From these measured deviations at least one of the following setting errors of the machine can be concluded:
  1. 1. A faulty sheet transfer due to incorrect setting of the arch-transporting gripper bridge,
  2. 2. On the lifting of the sheet from the impression cylinder due to incorrect adjustment of the blowing air for the bowing, and
  3. 3. on a defective radius of the impression cylinder over which the imaging system is mounted, for. B. due to incorrectly selected cylinder lifts / underlays.
  • The misadjustments mentioned can be obtained without pressure plates which have been specially used with measuring marks for measuring the sheet travel. Furthermore, a camera already included in the printing machine or a line sensor can be used to determine setting errors of the machine, which is primarily intended for other purposes, for example, for the color control or the quality assurance of the sheet.
  • The inventive method is carried out with relatively little effort, because it is essentially only a camera needed, which is attached to designated locations on the respective printing units and the signal is connected to the control of the printing press. By means of a corresponding diagnostic program, the setting errors in the relevant printing unit can then be identified from the measured geometric deviations. It is not even necessary to print the sheet with an image or patterns for this, but it is sufficient to run white unprinted sheets possibly at different speeds through the machine.
  • It is expedient to use specially selected sections of the sheet contour in the evaluation of the contours of the sheet edge, in which the aforementioned machine errors are reflected. Thus, from the distances of the contour pieces of the sheet leading edge between the grippers to the gripper trailing edge on false gripper opening times or too high or too low lying gripper bridges can be concluded. Similarly, it can be concluded from the deviations of the contour pieces of the sheet leading edge of a straight line on incorrect settings between the Bogenankunftszeit and the gripper closing times. Then, the rear part of the lateral sheet edges can be used for an evaluation, wherein from an apparent broadening of the sheet increasingly from the time at which the sheet leaves the printing nip on the extent of lifting of the sheet closed by the pressure cylinder. Furthermore, a wrong cylinder diameter, caused for example by uneven, too thick or too thin underlays, manifests itself in a lateral offset of the contour of the sheet side edges at the time when the sheet trailing edge leaves the printing nip.
  • For the improvement of the evaluation signals, it is expedient to subject them before the evaluation of a digital edge filtering and optionally threshold value operations for contrast enhancement.
  • Further advantages of the invention will become apparent from the following description of exemplary embodiments with reference to FIG FIGS. 1 to 6 of the accompanying drawings.
  • FIG. 1
    shows the schematic diagram of a printing machine with an imaging system for the inline evaluation of sheets during a print job.
    FIG. 2
    shows the captured by the camera 2 image of the arc after edge filtering and contrast enhancement.
    FIGS. 3 and 4
    show enlarged sections of the contour of the sheet leading edge at different machine conditions.
    FIG. 5
    shows enlarged sections of the recorded contour of the sheet side edge in the region of the sheet trailing edge.
    FIG. 6
    shows enlarged sections of the recorded contour of the left and right sheet side edge at the time when the sheet trailing edge leaves the printing nip.
  • In FIG. 1 schematically a sheet-fed printing machine 5 is shown, the printing units 3 and 4, wherein it can also be a coating unit in the printing unit 4. Of course, the printing press 5 has even more printing units for the various colors to be printed, which are not shown for reasons of simplicity in the figure. The printed by the printing machine sheets 7 are stored in the boom 6 at the end of the printing machine 5 on a stack.
  • At the printing unit 3, a camera 2 is mounted, which detects the image resting on the impression cylinder 13 of the printing unit 3 sheet while it is transported by the impression cylinder 13 in the gripper closure in the direction of the next printing unit 4 and taken over by a transferter 15 and the impression cylinder 14 of the printing unit or coating unit 4 is transferred. The camera 2 is used to inspect the printed image on the sheet and recorded at intervals of the frame rate each strip-shaped sections over the entire width of the sheet, which are assembled in sheet travel direction to form an image of the entire sheet.
  • In the printing unit 4, a spectral line sensor 1 is installed, via which the spectral remission of the color printed sheet is detected for the purpose of ink fountain control. For this purpose, the sensor line 1 extends either over the entire sheet width or consists of shorter individual lines, which are set side by side or can be moved to specific color zones.
  • Both imaging systems, the camera 2 and the sensor line 1, are connected to the controller 8 of the printing press 5. Their signals are subjected there by a transmitter various types of filtering and arithmetic operations, before the result of the computer contained in the controller 8 in control and control signals for quality assurance on the one hand and for the ink zone control on the other hand prepared and on the screen 9 optionally the operator of the printing press is shown.
  • With each of the two imaging systems, the camera 2 and the sensor line 1, it is now also possible to detect the contours of the printed sheet passing under the camera 2 or the sensor line 1. In this case, only the signals of the pixels of the camera 2 or of the line sensor 1, which lie on the edge of the image field, are required for imaging the sheet side edge. To image the leading and trailing edges can be used, the signals that the camera 2 and the sensor line 1 provides when this edge is running straight through the image field, which is achieved by a suitable synchronization of camera or sensor with the so-called machine angle, ie the angular position of the impression cylinders 13 and 14. This machine angle is known to the controller 8, which communicates with one or more encoders in the gear train of the printing press.
  • In the FIG. 2 The typical contour 19 of the edges of a sheet passing through the printing machine 5, as seen by either the camera 2 or the sensor 1, is shown. The sharp, high-contrast outline is obtained because the image signals were subjected to edge filtering by a Sobel filter on the one hand and to a contrast enhancement threshold operation on the other hand. In the area of the sheet leading edge can be seen the contours of the 18 grippers, with which the continuous sheet is held on the impression cylinder 13 and 14 respectively. In the FIG. 2 Outline 19 shown now has some irregularities compared to an ideal rectangle, which are explained in more detail in the following figures.
  • In the measuring field 24a on the enlarged portion of the sheet leading edge after FIG. 3 shows that the contour of the central gripper 23 shown there is displaced slightly in the direction of the sheet leading edge. This shorter distance indicates a different gripper opening time compared to the adjacent grippers. Furthermore, different distances of the gripper contour to the sheet leading edge could be due to the fact that the respective gripper pads on the impression cylinder holding the sheet are too high or too low compared to the gripper bridge on the transfer conveyor.
  • In the measuring field 24b after FIG. 4 It can be seen that the contour of the sheet leading edge is slightly curved in the region between the two grippers shown on the right and at 22, ie deviates from a straight line. This is an indication that either the sheet is not smoothly resting on the impression cylinder, but an air cushion has formed under the arch, which bulges the sheet at this point. Another reason for this picture is that the Arc arrival time and the gripper closing time do not match, ie that the sheet still moves and is advanced by the transferring cylinder before the affected gripper closes.
  • In the measuring fields 24c and 24d the right and left side edge of the bow after FIG. 5 It can be seen that the image of the sheet contour from a certain point to an apparently widened toward the trailing edge arc represents. In fact, as indicated by the comparison with the machine angle, the point denoted by 20a or 20b corresponds to the point in time at which the arc reaches the pressure gap 17 between z. B. the impression cylinder 13 and its associated blanket cylinder 16 leaves. This effect differs depending on the grammage of the sheet and results from the fact that the sheet, after it is no longer tightened by the printing nip, lifts off from it due to the rotational movement of the impression cylinder, the extent of the lifting being dependent on the thickness / Stiffness and the said grammage, ie the paper weight depends. Too much apparent broadening or, as a consequence, excessive lifting of the sheet from the counter-pressure cylinder is an indication of an incorrect setting of the blowing air introduced behind the printing nip in support of the sheet guide, from which the sheet is pressed onto the cylinder after leaving the printing nip.
  • Look in the measurement field 24of the side edges of the sheet FIG. 6 If the machine is otherwise misadjusted, an apparent lateral offset of the sheet can be seen at the locations indicated at 21a and 21b. Again, it is again an apparent offset at the time when the sheet trailing edge leaves the printing nip 17. The reason for this is a faulty backing of the blanket on the blanket cylinder 16 or a cylinder elevator on the impression cylinder 13, due to which the ratio of the cylinder radii from the ratio of the angular velocities of the two cylinders deviates from each other, these deviations can vary over the cylinder length. In these cases, the sheet is subject to strains and strains when passing through the nip, ie considerable forces that suddenly relax when leaving the nip and move the sheet in the millisecond range to the side.
  • Usually superimpose the basis of the FIGS. 5 and 6 described effects, but both can be easily separated from each other in the image analysis.
  • The described effects of incorrect settings of the printing press on the image of the sheet contour are dependent on the printing unit, d. H. describe in each case the incorrect settings of the printing unit, behind the nip of the sheet contour is displayed. On the other hand, since these incorrect settings / misalignments are relatively long-term stable, it is sufficient to use the inventive method at longer intervals on the machine, for example, the more or less regularly held service times. Therefore, a procedure in which the sheet contour is successively recorded in the various printing units of the printing press by the imaging system, for example the camera 2, is particularly advantageous. For this purpose, holders can be installed at the individual printing units, in which the camera 2 is attached easily replaceable, so that it is successively used in the individual printing units, while a blank paper stack is transported through the machine. The same applies to the extent that instead of the camera 2, a sensor line 1 is used.
  • It is quite possible for a plurality of images of different signatures to be taken in succession from the camera 2 or the sensor line 1 in order to either improve the signal-to-noise ratio of the edge image and thus to increase the measurement accuracy or to determine whether the deviations measured are reproducible Error acts.
  • LIST OF REFERENCE NUMBERS
  • 1
    sensor line
    2
    camera
    3
    printing unit
    4
    printing unit
    5
    Sheetfed
    6
    boom
    7
    bow
    8th
    control
    9
    screen
    13
    Impression cylinder
    14
    Impression cylinder
    15
    transferters
    16
    Blanket cylinder
    17
    nip
    19
    arc contour
    20a + b
    (Measuring) point
    21a + b
    (Measuring) point
    22
    (Measuring) point
    23
    grab
    24a-e
    measuring fields

    Claims (7)

    1. Method for establishing faulty settings in a sheet-fed printing press wherein the imaging system (1, 2) is essentially aligned to be perpendicular to the sheet surface and at least partially detects the visible contours (19) of the sheet margins,
      characterized in
      that the geometry of the passing print sheet is recorded by an imaging system and compared to target geometries for evaluation by drawing conclusions on at least one of the following faulty settings in the printing units (3, 4) of the printing press (5) based on the measured deviations of the contours (19) from the rectangular target contour of the sheet:
      - based on the distance (23) of the contour sections of the leading edge of the sheet between the grippers and the gripper trailing edge, on wrong gripper opening instants or gripper pads that are located too high or too low,
      - based on the deviations (22) of the contour sections of the leading edge of the sheet from a straight line, on faulty settings between the instant of arrival of the sheet and the gripper closing instants,
      - based on an apparent widening of the sheet from the instant (20a, b) at which the sheet leaves the printing nip, on a degree to which the print sheet lifts off the printing cylinder (13, 14) due to a wrong setting of the blown air for sheet guidance,
      - based on a horizontal offset of the contour at the instant (21a, b) at which the trailing edge of the sheet leaves the printing nip, on a faulty radius of the impression cylinder or blanket cylinder for example due to the wrong underlaying material/cylinder sleeves.
    2. Method according to Claim 1,
      wherein the imaging system (1, 2) is a video camera or a sensor line.
    3. Method according to Claim 1,
      wherein the signals provided by the imaging system (1, 2) for multiple sheets that successively pass through the printing press (5) are evaluated to detect the faulty settings of the printing press.
    4. Method according to Claim 1,
      characterized in
      that multiple imaging systems (1, 2) are arranged in respective different printing units of the printing press or one imaging system is successively attached to different printing units (3, 4).
    5. Method according to Claim 1,
      wherein to record the sheet contours (19), unprinted sheets are conveyed through the printing press (5) and deposited on the delivery stack (7) in an unprinted state.
    6. Method according to any one of Claims 1 to 5,
      wherein previously selected sheet contour sections (24) are used for the evaluation of the geometry deviations.
    7. Method according to any one of Claims 1 to 6,
      wherein the image signals that describe the contour (19) of the sheet or contour sections (24), are subjected to digital edge filtering before being evaluated.
    EP20120165476 2011-05-04 2012-04-25 Method for detecting configuration errors in a sheet printing device Active EP2520430B1 (en)

    Priority Applications (1)

    Application Number Priority Date Filing Date Title
    DE102011100413A DE102011100413A1 (en) 2011-05-04 2011-05-04 Method for determining setting errors in a sheet-fed printing machine

    Publications (2)

    Publication Number Publication Date
    EP2520430A1 EP2520430A1 (en) 2012-11-07
    EP2520430B1 true EP2520430B1 (en) 2014-08-27

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    Family Applications (1)

    Application Number Title Priority Date Filing Date
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    US (1) US20120279410A1 (en)
    EP (1) EP2520430B1 (en)
    DE (1) DE102011100413A1 (en)

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    DE102017012187A1 (en) 2017-07-14 2019-01-17 Koenig & Bauer Ag Sheet processing machine
    DE102017212132B4 (en) 2017-07-14 2019-06-19 Koenig & Bauer Ag Sheet processing machine
    DE102017012188A1 (en) 2017-07-14 2019-01-17 Koenig & Bauer Ag Sheet processing machine
    DE102017212143B4 (en) 2017-07-14 2019-03-21 Koenig & Bauer Ag Sheet processing machine
    DE102017212140B4 (en) 2017-07-14 2019-03-28 Koenig & Bauer Ag Sheet processing machine
    DE102017212134B4 (en) 2017-07-14 2019-03-28 Koenig & Bauer Ag Sheet processing machine
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    Also Published As

    Publication number Publication date
    US20120279410A1 (en) 2012-11-08
    EP2520430A1 (en) 2012-11-07
    DE102011100413A1 (en) 2012-11-08

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