EP0357987A2 - Method for checking and/or controlling the dampening in an offset printing machine - Google Patents

Method for checking and/or controlling the dampening in an offset printing machine Download PDF

Info

Publication number
EP0357987A2
EP0357987A2 EP89114781A EP89114781A EP0357987A2 EP 0357987 A2 EP0357987 A2 EP 0357987A2 EP 89114781 A EP89114781 A EP 89114781A EP 89114781 A EP89114781 A EP 89114781A EP 0357987 A2 EP0357987 A2 EP 0357987A2
Authority
EP
European Patent Office
Prior art keywords
scanning
areas
area
printing
scanned
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
Application number
EP89114781A
Other languages
German (de)
French (fr)
Other versions
EP0357987A3 (en
EP0357987B1 (en
Inventor
Helmut Kipphan
Gerhard Löffler
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
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DE19883830732 priority Critical patent/DE3830732C2/en
Priority to DE3830732 priority
Application filed by Heidelberger Druckmaschinen AG filed Critical Heidelberger Druckmaschinen AG
Publication of EP0357987A2 publication Critical patent/EP0357987A2/en
Publication of EP0357987A3 publication Critical patent/EP0357987A3/en
Application granted granted Critical
Publication of EP0357987B1 publication Critical patent/EP0357987B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F33/00Indicating, counting, warning, control or safety devices
    • B41F33/0054Devices for controlling dampening

Abstract

In a method for checking the dampening in an offset printing machine, characteristically non-printed surfaces in the region of edges of predetermined ink surfaces are scanned with the aid of an optoelectric converter and the signals produced by the scanning are evaluated. The scanning preferably takes place in four tone areas of a print control strip. The method is suitable both for checking per se and for automatic control of dampening. …<IMAGE>…

Description

  • The invention is based on a method for monitoring the dampening solution guidance in an offset printing machine. With the offset process, lack of moisture is noticeable through streaks and color points of irregular distribution at the places that are color-free with the correct amount of dampening solution. Such deposits of paint due to a lack of moisture are initially seen behind surfaces with high surface coverage when the lack of moisture begins. With a further increase in the lack of moisture, the area of the color deposits becomes larger until the so-called toning also covers other, otherwise pressure-free areas.
  • The beginning toning can only be recognized visually when magnified accordingly, for example with a magnifying glass. However, toning rarely occurs over the entire width of the sheet or web. The visual control by means of a magnifying glass must therefore extend over the entire width and therefore requires a considerable amount of time and concentration for the printer. In addition, too high a dampening solution guide, which is a large Safety distance from the tonal limit has resulted in less high-contrast and less clear prints. In order to achieve good print quality, efforts are therefore made to print as close as possible to the tonal limit.
  • In the case of known proposals for a solution for a technical control or regulation of the amount of dampening solution, the amount of dampening solution in the ink or on the printing plate is determined in the printing unit either by indirect or direct measuring methods. However, the known methods have various disadvantages and have therefore not proven themselves in practice. For example, the dampening solution content in black printing ink cannot be measured using the infrared method. Furthermore, moisture measurements on the plate are heavily dependent on the reflection behavior of the plate surface. The assignment of the measured values to the water layer thickness therefore differs from plate type to plate type and also depends on the rolling direction.
  • The object of the invention is to provide a method for monitoring and / or regulating the dampening solution guide in an offset machine, in which, unaffected by other parameters, moisture deficiency can be determined, displayed and / or corrected.
  • The method according to the invention is characterized in that unprinted areas in the area of edges of predetermined color areas are scanned with the aid of an opto-electrical converter and that the signals resulting from the scanning are evaluated. Preferably, unprinted areas are scanned that lie on the rear edges of the color areas when viewed in the printing direction. However, other edge areas of color areas can also be scanned within the scope of the invention.
  • Measuring fields of a print control strip, which represent an individual color or a printing unit, can preferably be used as the predetermined color areas. However, it is also possible to use other suitable colored areas that are already in the printed image.
  • The specified color areas can be solid color fields or grid fields with a high area coverage, but always only color fields of a single color - that is, no overlaying of several colors. A further development of the method according to the invention, which allows visual monitoring, consists in that the respective scanned areas are shown enlarged on a screen.
  • Another further development provides that the signals resulting from the scanning of the areas lying behind the edges of the predetermined colored areas are compared with comparison values and that, depending on the comparison result, a lack of moisture signal is derived which characterizes insufficient dampening solution guidance. It is particularly advantageous that the comparison value lies between the brightness of the unprinted area and the brightness of the color area.
  • First, the signals can be compared with a comparison value that lies between the brightness of the unprinted area and the brightness of the color area. The area proportion of the signals above or below the comparison value is then calculated based on the area scanned in each case. This is preferably done by counting picture elements. A lack of moisture signal is derived when the area share exceeds a predetermined level.
  • With this development, automatic monitoring and / or regulation of the dampening solution guidance is also possible.
  • The scanning can preferably be carried out on a printed sheet. In the method according to the invention, scanning on the rubber blanket or on the clamped printing plate is not excluded.
  • A method according to the invention, in which, in addition to monitoring, regulation of the dampening solution guidance is also provided, is characterized in that the regulation of the dampening solution guidance takes place as a function of the evaluation of the signals generated by the scanning.
  • In an advantageous embodiment of the development, it is provided that the dampening solution guidance is increased when the lack of moisture signal occurs and is gradually reduced when no lack of moisture signal occurs.
  • In another development, the colored areas are also scanned and an excess moisture signal is derived from the signals generated by the scanning of the colored areas. For this purpose, the signals resulting from the scanning of the colored areas can be fed to an image processing system. The resulting excess moisture signal can be used together with the lack of moisture signal to regulate the dampening solution guidance.
  • The measures listed in the further subclaims enable further advantageous developments and improvements of the invention specified in the main claim and advantageous arrangements for carrying out the method according to the invention.
  • Exemplary embodiments of the invention are shown in the drawing using several figures and are explained in more detail in the following description. It shows:
    • 1 shows a part of a printed sheet with a print control strip,
    • 2 and FIG. 3 a device known per se for evaluating a printed color measuring strip with an additionally integrated moisture measuring head,
    • 4 shows a schematic illustration of a measuring head suitable for the method according to the invention and a circuit arrangement for carrying out the method according to the invention,
    • 5 shows time diagrams of some signals occurring in the circuit arrangement according to FIG. 4,
    • Fig. 6 shows an embodiment of part of a moisture measuring head and
    • 7 shows a further circuit arrangement for carrying out the method according to the invention.
  • Identical parts are provided with the same reference symbols in the figures.
  • The section of a printed sheet 5 shown in FIG. 1 contains a print control strip MS with several measuring fields MF. Of the various measuring fields MF, solid tone fields of the colors B = black, C = cyan, M = mangenta, Y = yellow and a fifth and sixth color are shown in FIG. Fields of the colors B and C are shown as examples as grid fields with a color coverage of 70% to 90%. Because when there is a lack of moisture For example, in the black behind the solid field B, toning begins first, stronger toning occurs in the example shown, while in grid B, the toning is less strong.
  • In the method according to the invention, the area shown in dashed lines in FIG. 1 is scanned. The scanning takes place line by line, the lines lying parallel to the printing direction and a sensor described in more detail in connection with FIG. 4 being used for scanning in this direction. For the sake of clarity, FIG. 1 shows only a few lines Z. The scanning transverse to the printing direction is preferably carried out using a device known per se, which is shown in FIG. 2 and in FIG. 3.
  • Instead of a line sensor, it is also possible to use an area sensor which, for example, scans an area F in each position, which area is assigned to a measurement area.
  • The device shown in Fig. 2 comprises a measuring table 1 and on this a measuring bridge 2 with a measuring carriage 3, four clamping blocks 4 for holding a sheet 5 to be measured, an electronic part 6 and a personal computer 7. The plate of the table 1 has one top cover layer on a sheet steel layer, which allows the sheet 5 to be held by means of magnets or the like. The personal computer 7 provided with an integrated screen terminal is rotatably mounted on the table. The measuring car 3, the electronic part 6 and the personal computer 7 are connected via lines, not shown.
  • The electronic part 6 comprises a microprocessor system and interfaces for processing the supplied and the measurement and control signals generated by it. The Microprocessor system in the electronic part works with the personal computer 7 in the so-called master-slave operation, the personal computer having the control function and evaluating the measured and entered data, while the system in the electronic part for carrying out the measurements and movements of the test vehicle is responsible.
  • The measuring strip, that is the sequence of the measuring field types, the colors, the area coverage etc. as well as the distances between them, is known to the system by a single entry. As a result, measured values only have to be accepted at certain positions.
  • In Fig. 3, the measuring bridge 2 is shown larger. It comprises two vertical side parts 11 and 12, which carry the remaining parts of the bridge, and two covers 13 and 14, which cover the space between the two side parts and are pivotally mounted on them, so that they are in the position shown in Fig. 3 can be unfolded and give access to the inner parts of the measuring bridge. The two side parts 11 and 12 are connected to one another by a guide shaft 15 and a connecting rod 16, which is only indicated in the drawing.
  • On the guide shaft 15, the measuring carriage designated as a whole by 3 can be moved to and fro and pivoted about the shaft. The measuring carriage 3 consists of a guide block 17 provided with two ball bushings and two measuring heads 18 and 19 fastened to it and a guide or hold-down plate 20 which is angled upwards on both sides. The measuring carriage is provided with rollers (not shown) on the underside. In operation, the measuring carriage is supported on the printing sheet 5 to be measured, as a result of which the distance between the measuring heads 18 and 19 and the individual fields MF of the printing sheet 5 is located Measuring strip MS is always constant. The measuring head 19 is in principle of the type described in US Pat. No. 4,078,858 and simultaneously measures three color channels. The measuring head 18 is used to carry out the method according to the invention and is explained in more detail with reference to FIG. 4.
  • To drive the measuring carriage 3, a toothed belt 23 is provided, which is guided via two rollers or rollers 24 and 25 rotatably mounted on each of the side parts 11 and 12 and on the lower run of which the guide block 17 is fastened. The left-hand roller 25 in FIG. 3 is driven by a stepping motor 27 via a toothed belt reduction gear 26, which is only indicated by dashed lines. The other roller 24 is freely rotatable in a clamping device 28. Stepper motor 27 and gear 26 are dimensioned so that the toothed belt 23 and thus the measuring carriage 3 is transported by 0.1 mm per complete motor step.
  • A guide profile 29 is arranged in the rear cover 13, in which the electrical flat conductor connection (not shown) of the measuring carriage 3 with the electronic part 6 runs. On the side parts 11 and 12 are also indicated by blocks 30 quick-release fasteners for fixing the two covers 13 and 14 in the raised closed position and a fork light barrier 31 each, which with a sheet metal strip or the like, not shown, on the guide block 17 or measuring carriage 3 interacts in such a way that the measuring car is automatically stopped when he z. B. comes closer than a certain minimum distance due to a control error.
  • A cross-sectionally U-shaped holder 32 is fastened in the front cover 14, in which five marker lamps are arranged which are distributed uniformly over the length of the measuring bridge. These lamps exist from a light source in the form of a so-called line lamp (not visible in FIG. 3) in the upper leg of the holder and a projection optical system 33 in the lower holder leg and produce five lines of marking light lying in a line on the printed sheet 5, each about 20 mm long. The light lines serve to align the printed sheet 5 such that the measuring strip MS comes to lie exactly below the path of movement of the two measuring heads 18 and 19.
  • Finally, on the top of the front cover 14 there is also a rocker switch 35, by means of which the measuring carriage 3 can be moved in a controlled manner into the desired measuring position along the measuring strip MS.
  • In the exemplary embodiment shown in FIG. 4, the scanning takes place with a charge-coupled line sensor (CCD line) 41. As already mentioned, area sensors, i. H. Video cameras with recording tubes or semiconductor recording elements can be used.
  • Line sensors are available in various designs and include, for example, 1024 light-sensitive elements, the charges of which depend on the exposure in question are transferred to an output register by applying a pulse H (FIG. 5a) and then read out serially from the output register by clock pulses T. The pulses T and H are derived in a clock generator 42. A video signal V representing the brightness distribution on the line sensor is then available at output 43.
  • With the aid of an objective 44, one line of the surface of the printed sheet 5 to be scanned is imaged on the line sensor. A part of the measuring surface and a part of the printing sheet 5 which is in itself unprinted and lies behind the measuring surface MF is recorded. One is used for lighting Illumination device 40.
  • An example of a video signal present at 43 is shown in Fig. 5b). The solid course corresponds to a line in which no toning can be seen. Beginning toning, such as in the raster measurement field B (FIG. 1), leads to drops in the video signal, as shown in dashed lines in FIG. 5b). Between the times t0 and t1, the video signal represents the measuring area, between t1 and t2 the subsequent unprinted area.
  • The video signal can be evaluated in various ways. In this case, a simple visual evaluation can be carried out by enlarged display of the video signal on a monitor 62. Basically, various methods are available for the metrological evaluation of video signals. A particularly simple method consists, for example, of feeding the time segment of interest of the video signal to a threshold circuit via a gate circuit and of emitting a suitable signal when the threshold value is undershot. However, the evaluation can also be carried out using complex methods. Analog and digital circuits as well as computer systems can be used. In the arrangement shown in Fig. 4, the processing steps leading to a multi-digit digital signal dependent on the degree of toning are carried out with digital circuits. A microprocessor system 56 is provided for further processing and for superordinate control of the measurement sequence.
  • Since in each case one line comprises a time period t0 to t1 during which the measuring field is scanned and another time period t1 to t2, which corresponds to the scanning of the unprinted area behind the measuring field, the signal components in FIGS. 5c) and 5d ) shown pulses I1 and I2 generated. For this purpose, the clock generator 42 supplies the clock to a counter 45, which is reset by the pulse H at the beginning of each line. The pulses I1 and I2 are derived from the counter reading in a logic circuit 46 by correspondingly linking the individual digits of the counter.
  • From the output 43 of the line sensor 41, the video signal V passes via an amplifier 47 to the input of an analog / digital converter 48. At the output of the analog / digital converter 48, the video signal is present in the form of an 8-bit wide digital signal DV and can therefore be the following can be further processed by digital circuits. The video signal DVMF obtained by partially scanning the measuring field MF is forwarded by an AND circuit 49, while the AND circuit 50 forwards that part DVT of the video signal which represents the unprinted printed sheet.
  • In the subsequent circuits 51, 52, the digital video signals DVMF and DVT are each time-averaged over the first lines formed during the scanning of a measuring field MF (signals S1 and S2). The mean value, for example the arithmetic mean value, is then in turn formed from the two mean values in a circuit 53. A threshold value S3 has thus been derived, which is shown in FIG. 5b) as a dash-dotted line. This threshold value thus adapts to the brightness of the measuring field MF and the brightness of the unprinted printed sheet 5. The derivation of the signal S1, which corresponds to the mean brightness of the unprinted sheet, can take place in an adjacent unprinted area of the sheet, where there is certainly no toning, and can be stored until the area which is unprinted but possibly affected by toning is scanned.
  • The threshold value S3 and the digital video signal DVT are fed to a comparator whose output signal depends on whether the video signal falls below the threshold value S3 within the second period t1 to t2. This signal (FIG. 5a)) could in itself already be used as a lack of moisture signal, but a false alarm would be triggered by the smallest errors in the printing material. It is therefore provided in the circuit according to FIG. 4 that the output signal of the comparator 54 enables or blocks a counter 55. The clock pulses T are fed to the clock input CLK of the counter. After each scanning of a measuring field MF and the unprinted area behind it, the content of the counter 55 is transferred to a register 57 and the counter 55 is reset shortly thereafter. For this purpose, a takeover pulse is fed from the microprocessor system 56 to the register 57 and, via a delay circuit 58, to the reset input of the counter 55.
  • By counting clock pulses during the time during which the video signal V or DV falls below the threshold S3, a measure of the area affected by the toning is obtained. This measure can be evaluated in microprocessor system 56 in accordance with practical requirements. For example, if there is a very small amount of area, it can be decided that there is no toning yet, and the area area beyond that can be used as a measure of the degree of toning. According to this information, further units, such as a digital display device or actuators for the amount of dampening solution, can be controlled via outputs 59, 60 of the microprocessor system 56.
  • The digital video signals are written into a memory 61 while scanning a measuring field MF and the unprinted area behind it. If toning occurs in this measuring field, the microprocessor system 56 activates a read-out part 62 of the memory by means of a signal S4, which reads out the stored signals from the memory 61 and feeds them to a monitor 63. The reading is repeated in order to achieve a continuous display. The monitor 63 therefore only represents the measuring surface and the associated part of the unprinted surface when there is toning. The threshold for the display on the monitor can be set relatively low, so that the printer can judge whether measures need to be taken as soon as the toning starts. For the rest of the time, the display 63 does not distract the printer.
  • A corresponding program can be provided in the microprocessor system 56 for the automatic control of the dampening solution guidance, which program supplies more dampening solution when toning occurs. Depending on the embodiment of the method according to the invention, the dampening solution guidance can be increased once depending on how strongly the toning occurs (output of counter 55). However, a gradual, gradual lowering can take place after the upward movement until toning occurs again. This "trial-and-error" exceeding the tonal limit practically does not affect the print quality, since the method according to the invention recognizes even the slightest toning - in particular if the scanning takes place at a point that is particularly critical for toning (black solid tone area).
  • In order to be able to detect an excess of dampening solution according to a further development of the method according to the invention, the signal S2 which represents the average brightness of the represents scanned part of a measuring field, fed to the microprocessor system. The coverage, in particular of full-tone fields, becomes worse when there is an excess of dampening solution. If the setpoint for a measuring field is stored in the microprocessor system, then excess dampening solution can be inferred from a deviating brightness of a full-tone field. The result can be included in the automatic humidity control.
  • An image processing system can also be used to detect excess moisture. The coverage, especially of solid fields, becomes noticeably worse if there is too much dampening solution. By comparing it with a perfect image or its area coverage (100% coverage is not possible due to the surface roughness of the substrate), an image processing system can determine deviations, display them and / or derive control signals based on stored algorithms. Since significant under-coloring can also cause poor coverage, a comparison of the color measurement values of different or all zones first determines whether there is under-coloring or excess moisture. Excess moisture initially arises in color zones with little color guidance, since the moisture supply is not regulated zonally. The color zone opening, the value of which is known to the computer of the color control device, is a measure of the zonal area coverage and thus the height of the color guide. This value is used for the logical link. If, for example, the full tones of zones with a smaller ink zone opening are poorly covered and colored less than the full tones of zones with a larger opening, there is excess moisture here.
  • At the transition between two measuring fields, the microprocessor system 56, which also controls the movement of the measuring head 19 in a manner not shown, emits a pulse I3 to circuits 51, 52 and to memory 61.
  • 6 schematically shows a measuring head with a line sensor 41 onto which the original 5 to be scanned is imaged with the aid of an objective 44. An illumination device 40 is also provided. In order to achieve an averaging transverse to the direction of the line sensor, the line sensor 41 is provided with a cylindrical lens 65. This means that later electrical integration across the line direction can be omitted.
  • While in the circuit arrangement according to FIG. 4 the video signal is evaluated with a circuit specially designed for it and the size of the area affected by the toning is passed on to a microprocessor system, in the circuit arrangement according to FIG. 7 the complete evaluation by a microprocessor is provided.
  • The scanning of an edge of a full-tone area MF over a measuring range G takes place with the aid of a sensor 71. The signal generated by the sensor 71 is fed via an analog / digital converter 72 to an input of the microprocessor 73, which is connected to a display device 74 and also via an output 75 can be connected to actuators for dampening solution guidance of a printing press.
  • With the aid of a suitable program, the microprocessor 73 appropriately evaluates the digital video signals. Steps similar to those in the circuit arrangement according to FIG. 4 can be provided.

Claims (27)

1. A method for monitoring the dampening solution guide in an offset printing machine, characterized in that in itself unprinted areas in the area of edges of predetermined color areas are scanned with the aid of an opto-electrical converter and that the signals produced by the scanning are evaluated.
2. The method according to claim 1, characterized in that unprinted areas are scanned, which lie on the rear edges of the colored areas when viewed in the printing direction.
3. The method according to any one of claims 1 or 2, characterized in that the predetermined color areas are measuring fields of a print control strip.
4. The method according to any one of claims 1 to 3, characterized in that the predetermined color areas are solid fields.
5. The method according to any one of claims 1 to 3, characterized in that the predetermined color areas are grid fields with a high area coverage.
6. The method according to any one of claims 1 or 2, characterized in that areas within the print image are used for evaluation.
7. The method according to any one of the preceding claims, characterized in that the scanned areas are shown enlarged on a screen.
8. The method according to any one of the preceding claims, characterized in that the signals resulting from the scanning of the areas lying at the edges of the predetermined colored areas are compared with comparison values and that, depending on the comparison result, a lack of moisture signal is derived which characterizes an insufficient dampening solution guidance.
9. The method according to claim 8, characterized in that first the signals are compared with a comparison value, that the comparison value lies between the brightness of the unprinted area and the brightness of the color area and that the area proportion of the signals above or below the comparison value based on the each scanned area is calculated.
10. The method according to claim 9, characterized in that the proportion of the area is carried out by counting picture elements in which the corresponding signals exceed or fall below the comparison value.
11. The method according to any one of claims 9 or 10, characterized in that a lack of moisture signal is derived when the proportion of area exceeds a predetermined amount.
12. The method according to any one of claims 1 to 7, characterized in that an average value is formed from the signals resulting from the scanning of the areas lying behind the edges of the predetermined color areas, that the average value is compared with a comparison value and that a lack of moisture signal is derived if the mean exceeds or falls below the comparison value.
13. The method according to claim 7, characterized in that the respectively scanned area is only displayed on the screen when the lack of moisture signal occurs.
14. The method according to any one of the preceding claims, characterized in that the scanning is carried out on a printed sheet.
15. The method according to any one of the preceding claims, characterized in that the scanning is carried out on a printed sheet on a printing cylinder.
16. The method according to claim 12, characterized in that the scanning is carried out in printing presses with a plurality of printing units in the last printing unit and in perfecting sheetfed presses additionally in the last printing unit before the twist.
17. The method according to any one of the preceding claims, characterized in that the scanning in the printing press is preferably carried out on the blanket or on the clamped printing plate.
18. The method according to any one of the preceding claims, in which a regulation of the dampening solution guidance is provided, characterized in that the regulation of the dampening solution guidance takes place as a function of the evaluation of the signals generated by the scanning.
19. The method according to any one of the preceding claims, further comprising a control of the dampening solution guidance, characterized in that the dampening solution guidance is increased when the lack of moisture signal occurs, and is gradually reduced when no lack of moisture signal occurs.
20. The method according to any one of the preceding claims, characterized in that the color areas are further sampled and that an excess moisture signal is derived from the signals resulting from the scanning of the color areas.
21. The method according to claim 20, characterized in that the signals resulting from the scanning of the colored areas are fed to an image processing system.
22. Arrangement for performing the method according to the invention, characterized in that an opto-electrical line sensor (41) is provided for scanning in a measuring head (19) and that the measuring head is movable transversely to the printing direction.
23. Arrangement for performing the method according to the invention, characterized in that an opto-electrical surface sensor is provided for scanning in a measuring head and that the measuring head can be positioned on the surfaces to be scanned.
24. Arrangement for performing the method according to the invention, characterized in that an opto-electrical surface sensor for scanning is provided in a measuring head, that the measuring head is continuously movable transversely to the printing direction and that output signals of the surface sensor can then be supplied to the evaluation when the measuring head is on the each surface to be scanned is directed.
25. Arrangement according to one of claims 22 to 24, characterized in that signals generated by the opto-electrical sensor can be supplied to a target / actual comparison.
26. Arrangement for performing the method according to the invention, characterized in that the position of the edge between the predetermined color area and the unprinted area is determined from the signals generated by the scanning.
27. Arrangement for performing the method according to the invention, characterized in that an opto-electrical line sensor for scanning is provided in a measuring head (19), on which the surface to be scanned can be imaged with the aid of a lens, and that the line sensor is provided with a cylindrical lens whose curvature is transverse to the longitudinal direction of the line sensor.
EP89114781A 1988-09-09 1989-08-10 Method for checking and/or controlling the dampening in an offset printing machine Expired - Lifetime EP0357987B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19883830732 DE3830732C2 (en) 1988-09-09 1988-09-09 Process for dampening solution control in an offset printing machine
DE3830732 1988-09-09

Publications (3)

Publication Number Publication Date
EP0357987A2 true EP0357987A2 (en) 1990-03-14
EP0357987A3 EP0357987A3 (en) 1991-02-27
EP0357987B1 EP0357987B1 (en) 1995-04-05

Family

ID=6362648

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89114781A Expired - Lifetime EP0357987B1 (en) 1988-09-09 1989-08-10 Method for checking and/or controlling the dampening in an offset printing machine

Country Status (7)

Country Link
US (1) US5050994A (en)
EP (1) EP0357987B1 (en)
JP (1) JPH02108542A (en)
CN (1) CN1013428B (en)
AU (1) AU617864B2 (en)
CA (1) CA1319294C (en)
DE (1) DE3830732C2 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4413731A1 (en) * 1994-04-20 1995-10-26 Heidelberger Druckmasch Ag Process for checking the color guidance in a printing press
EP0744289A2 (en) * 1995-05-20 1996-11-27 KOENIG &amp; BAUER-ALBERT AKTIENGESELLSCHAFT Method for regulating the quantity of damp
US5588366A (en) * 1994-04-20 1996-12-31 Heidelberger Druckmaschinen Ag Method of monitoring the wear on printing forms in a printing machine
EP0705171B1 (en) * 1993-06-25 2002-03-06 Heidelberger Druckmaschinen Aktiengesellschaft Process for controlling or regulating a printing machine
EP1932670A1 (en) * 2006-12-13 2008-06-18 Kba-Giori S.A. Method for controlling a balance between dampening solution and ink in a wet-offset printing press and system for carrying out the method
EP1957283A2 (en) * 2005-12-05 2008-08-20 Goss International Americas, Inc. Apparatus and method for controlling delivery of dampener fluid in a printing press

Families Citing this family (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4106082A1 (en) * 1990-04-26 1991-10-31 Heidelberger Druckmasch Ag Method and device for positioning a sensor device
DE4214139C2 (en) * 1992-04-29 2002-01-10 Heidelberger Druckmasch Ag Process for dampening solution regulation when printing from a form cylinder in an offset printing machine
DE4238557A1 (en) * 1992-11-14 1994-05-19 Koenig & Bauer Ag Method for adjusting the amount of dampening solution in an offset rotary printing press
US5606913A (en) * 1993-03-16 1997-03-04 Ward Holding Company Sheet registration control
DE4321177A1 (en) * 1993-06-25 1995-01-05 Heidelberger Druckmasch Ag Device for parallel image inspection and color control on a printed product
US5592880A (en) * 1993-12-30 1997-01-14 Heidelberger Druckmaschinen Method of supplying or feeding dampening solution
DE4401900C2 (en) * 1994-01-24 1998-07-09 Heidelberger Druckmasch Ag Method for controlling a print image position on a sheet in a sheet printing machine
DE4402828C2 (en) * 1994-01-31 2001-07-12 Wifag Maschf Measuring field group and method for quality data acquisition using the measuring field group
DE4402784C2 (en) * 1994-01-31 2001-05-31 Wifag Maschf Measuring field group and method for quality data acquisition using the measuring field group
US5816164A (en) * 1994-04-20 1998-10-06 Heidelberger Druckmaschinen Ag Method and apparatus for monitoring image formation on a printing form
DE4413773C2 (en) * 1994-04-20 1998-07-02 Heidelberger Druckmasch Ag Process for checking the imaging of printing forms for a printing press
DE4436582C2 (en) * 1994-10-13 1998-07-30 Heidelberger Druckmasch Ag Method for controlling an amount of dampening solution for a printing form of a running offset rotary printing press
JP2746855B2 (en) * 1995-04-03 1998-05-06 株式会社東京機械製作所 Abnormality detection device in nozzle type dampening device
DE19546260C1 (en) * 1995-12-12 1996-11-21 Weitmann & Konrad Fa Monitoring spray quantity on material conveyor method , e.g. paper path moved towards a moistening position, in graphics industry
DE19637234C2 (en) * 1996-09-13 2001-08-02 Michael F Braun Procedure for checking the color purity of surfaces
US6059705A (en) * 1997-10-17 2000-05-09 United Container Machinery, Inc. Method and apparatus for registering processing heads
DE10152466B4 (en) 2000-11-24 2015-12-17 Heidelberger Druckmaschinen Ag Humidity control taking into account several variables influencing the printing process
DE10142636B4 (en) * 2001-08-31 2006-04-20 Maschinenfabrik Wifag Method and device for detecting a position of a moving printing material web
JP2003334930A (en) * 2002-05-21 2003-11-25 Dainippon Screen Mfg Co Ltd Printing press and damping water supply method therein
JP4638685B2 (en) 2003-06-10 2011-02-23 ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフトHeidelberger Druckmaschinen AG Method of metering dampening water during printing on an offset press
DE10328705A1 (en) * 2003-06-26 2005-01-27 Koenig & Bauer Ag Method of setting amount of fountain solution for ink and fountain solution emulsion in offset printing machine by detecting energy needed to reduce fountain solution
US6796227B1 (en) * 2003-08-18 2004-09-28 Quad Tech Lithographic press dampening control system
US7330164B2 (en) * 2003-08-25 2008-02-12 Thomson Licensing Video controlled detector sensitivity
DE102004021600A1 (en) * 2004-05-03 2005-12-08 Gretag-Macbeth Ag Device for inline monitoring of print quality in sheetfed offset presses
GB0417586D0 (en) * 2004-08-06 2004-09-08 Goss Graphic Systems Ltd Dampening control for a printing press
DE102007008017A1 (en) * 2007-02-15 2008-08-21 Gretag-Macbeth Ag Color separation correction methods
DE102008001178B4 (en) * 2008-04-15 2011-06-30 manroland AG, 63075 Method for operating a printing machine
CN106862106B (en) * 2016-11-10 2019-07-30 浙江三杰印刷科技有限公司 The anti-mixed goods devices and methods therefor of gold blocking die-cutting machine

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140760A1 (en) * 1981-01-07 1982-08-12 Polygraph Leipzig Method for correcting deviations in inking and damping in offset printers

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE80046C (en) *
US3053181A (en) * 1958-10-30 1962-09-11 Lithographic Technical Foundat Method for controlling print quality for lithographic presses
US3234871A (en) * 1963-09-17 1966-02-15 Robert E Ostwald Automatic liquid control and scanning device for duplicating machines
DE2141247A1 (en) * 1970-08-19 1972-03-09
CH607021A5 (en) * 1975-12-30 1978-11-30 Gretag Ag
JPS605472B2 (en) * 1976-09-22 1985-02-12 Komori Printing Mach
US4289405A (en) * 1978-10-13 1981-09-15 Tobias Philip E Color monitoring system for use in creating colored displays
DE3479832D1 (en) * 1983-05-17 1989-10-26 Sumitomo Heavy Industries Method of an apparatus for measuring dampening water for printing machine
DE3483606D1 (en) * 1983-12-19 1990-12-20 Gretag Ag Method, device and color measurement strip for print quality assessment.
US4947348A (en) * 1987-03-25 1990-08-07 Kollmorgen Corporation Densitometer method and system for identifying and analyzing printed targets
US4876457A (en) * 1988-10-31 1989-10-24 American Telephone And Telegraph Company Method and apparatus for differentiating a planar textured surface from a surrounding background

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3140760A1 (en) * 1981-01-07 1982-08-12 Polygraph Leipzig Method for correcting deviations in inking and damping in offset printers

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
FOGRA-Symposium - Densitometrie oder Farbmessung in der Druckindustrie, München 12. - 14.4.1988, B. Kleinemeier "Der heutige Stand der Bilderfassung bei der Materialbahninspektion" *
FOGRA-Symposium - Offsetfeuchtung in Forschung und Praxis, München 17. und 18.11.1986, B. Wirz "Automatische Feuchtmittelregelung an Bogen- und Rollenoffsetmaschinen" *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0705171B1 (en) * 1993-06-25 2002-03-06 Heidelberger Druckmaschinen Aktiengesellschaft Process for controlling or regulating a printing machine
DE4413731A1 (en) * 1994-04-20 1995-10-26 Heidelberger Druckmasch Ag Process for checking the color guidance in a printing press
US5588366A (en) * 1994-04-20 1996-12-31 Heidelberger Druckmaschinen Ag Method of monitoring the wear on printing forms in a printing machine
DE4413731C2 (en) * 1994-04-20 1998-07-02 Heidelberger Druckmasch Ag Process for controlling the temperature of the printing ink in a printing press
US5546861A (en) * 1994-04-20 1996-08-20 Heidelberger Druckmaschinen Ag Method of controlling inking in a printing press
EP0744289A2 (en) * 1995-05-20 1996-11-27 KOENIG &amp; BAUER-ALBERT AKTIENGESELLSCHAFT Method for regulating the quantity of damp
EP0744289A3 (en) * 1995-05-20 1996-12-11 KOENIG &amp; BAUER-ALBERT AKTIENGESELLSCHAFT Method for regulating the quantity of damp
US5713286A (en) * 1995-05-20 1998-02-03 Koenig & Bauer-Albert Aktiengesellschaft Method for regulating dampening agent
EP1957283A2 (en) * 2005-12-05 2008-08-20 Goss International Americas, Inc. Apparatus and method for controlling delivery of dampener fluid in a printing press
EP1957283A4 (en) * 2005-12-05 2009-08-05 Goss Int Americas Inc Apparatus and method for controlling delivery of dampener fluid in a printing press
EP1932670A1 (en) * 2006-12-13 2008-06-18 Kba-Giori S.A. Method for controlling a balance between dampening solution and ink in a wet-offset printing press and system for carrying out the method

Also Published As

Publication number Publication date
CN1013428B (en) 1991-08-07
AU617864B2 (en) 1991-12-05
CN1040952A (en) 1990-04-04
CA1319294C (en) 1993-06-22
EP0357987A3 (en) 1991-02-27
DE3830732C2 (en) 2000-05-25
EP0357987B1 (en) 1995-04-05
DE3830732A1 (en) 1990-03-15
JPH02108542A (en) 1990-04-20
US5050994A (en) 1991-09-24
AU4126689A (en) 1990-03-15

Similar Documents

Publication Publication Date Title
EP0142469B1 (en) Method and device for controlling the ink supply in an offset printing machine, and offset printing machine provided with such a device
EP1437222B1 (en) Printing method, printed matter, and printing controller
EP1744884B1 (en) Method for determining colour values and/or density values, and printing device for implementing said method
JP5264166B2 (en) Inline measurement and adjustment on the press
US7664294B2 (en) System for automatic quality inspection of a printed image, comprising an image sensor, evaluation unit and display
DE19538811C2 (en) Method and device for monitoring a color in a printing press
US5992318A (en) System for maintaining ink density
CN1033630C (en) Quality control of image copy, for example of printed sample
US4932320A (en) Method and device for registering colors in an offset rotary press
JP2957359B2 (en) Qualitative determination of printed sheets
US6975949B2 (en) Full width array scanning spectrophotometer
US8017927B2 (en) Apparatus, system, and method for print quality measurements using multiple adjustable sensors
US5652804A (en) Automatic inspection of printing plates or cylinders
NL1025711C2 (en) Method and system for checking printed matter produced by a printing press.
JP3364430B2 (en) Ink key control in a printing press including lateral ink distribution, ink saturation and backflow compensation
US5434956A (en) Method and apparatus for printing an image in a specified positional relationship with a preprinted registration mark
EP0461338B1 (en) Print inspection method
EP1501280B1 (en) Digital printer
US3756725A (en) Measurement and control of ink density
EP1888338B1 (en) Printing machine and a method for producing a printed product
EP1068594B1 (en) Variable printing system and method with optical feedback
JP5306178B2 (en) Method for adjusting the inking device of a printing device
DE19509852C2 (en) Image recorder for high quality image control, and image quality control method thereof
EP1579992B1 (en) Printing press with at least one inking device
EP0909646B1 (en) A method for monitoring registration of images printed by a printer

Legal Events

Date Code Title Description
AK Designated contracting states:

Kind code of ref document: A2

Designated state(s): CH DE FR GB IT LI SE

17P Request for examination filed

Effective date: 19890810

AK Designated contracting states:

Kind code of ref document: A3

Designated state(s): CH DE FR GB IT LI SE

17Q First examination report

Effective date: 19921210

RBV Designated contracting states (correction):

Designated state(s): CH DE FR GB LI

AK Designated contracting states:

Kind code of ref document: B1

Designated state(s): CH DE FR GB LI

REF Corresponds to:

Ref document number: 58909156

Country of ref document: DE

Date of ref document: 19950511

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19950518

ET Fr: translation filed
26N No opposition filed
PGFP Postgrant: annual fees paid to national office

Ref country code: FR

Payment date: 19980813

Year of fee payment: 10

PGFP Postgrant: annual fees paid to national office

Ref country code: CH

Payment date: 19980923

Year of fee payment: 10

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990831

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19990831

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000428

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Postgrant: annual fees paid to national office

Ref country code: DE

Payment date: 20040913

Year of fee payment: 16

PGFP Postgrant: annual fees paid to national office

Ref country code: GB

Payment date: 20050722

Year of fee payment: 17

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060301

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20060810

PG25 Lapsed in a contracting state announced via postgrant inform. from nat. office to epo

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20060810