DK151131B - DEVICE AND PROCEDURE FOR MANAGING THE COLOR SUPPLY IN A ROTATION PRESSURE MACHINE - Google Patents

Description

151131

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a device for controlling the color supply of a rotary printing machine with adjusting means in the individual color zones, a measuring device for detecting Er values for the color density in the individual color zones of a printing product, an analyzer for detecting the color density, and a control station. with an indicator device associated with the positions of the adjusting means in the individual color zones.

In accordance with the progressive automation of the printing process, the invention aims to simplify the control of color movement in a printing plant and to arrange this control in such a way that it becomes clear and reliable.

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DE-OS No. 2,632,017 discloses a method used to generate color density data for a printed matter, and a color density test device having a measuring table, on which a fully automatic measurement of a the printed matter printed on the color guide strip, and wherein the measurement results in the form of color density Er values are printed numerically on a paper strip by means of which the operator can reset the printing machine. This test device has the disadvantage that human operation or control is erroneously excluded as the weakest part of the color density measurement and is replaced by automatic machining.

US-PS No. 3,930,447 discloses a control device for the color guidance of a roller rotation printing machine, which device is equipped with an indicator device designed as a cathode-ray tube, which has a display screen divided into two zones. In the upper display area, the positions of the color zone setting means are quantitatively indicated, while in the lower display area the deviations of the color density from predetermined set values are indicated. The color density-Er values needed for Set-value / Is-value comparison are determined by color-density measurements made directly over the printing cylinder in the machine on the continuous paper web, which requires both design and manufacturing considerably greater measurement costs than can be justified by sheet offset printing machines. Such direct indication by means of a cathode ray tube arrangement also presupposes a very high digitization expense at the indicator stage. The known control device also has the disadvantage that, for the indication or indication of color density deviations for several adjacent color zones, there is only one bright spot, which means that the printer receives no uninterrupted information on whether or not between the individual color zones - f. eg. in the case of full tones, in addition to percentage low raster tones - considerable color density differences already exist, which are thus not detected, indicated and adequately regulated.

In addition, the devices according to U.S. Pat. No. 3,390,447 and DE-OS No. 2,632,017 have the common disadvantage that the control of color grading, which is solely based on an automatic color density measurement, completely excludes that the operator can make a visual quality assessment of the print product and a reconciliation of the previously assessed rating values with the measured values. The fact that an automatic color density measurement only orients at individual points of a printed strip or checks certain points of the workpiece causes further disturbance phenomena occurring during the printing process, such as fouling of the rubber cloth, viscosity changes of the ink colors, etc., or simply spot limited faults, such as water sockets, holes in the rubber cloth, etc., are not detected, so that with control intervention can be compensated for. Thus, based on the acknowledgments today, the officer's function as an important control element must not be neglected.

Both in the color dosage known from DE-OS No. 2,434,680 in a printing machine as well as in the color box control device for offset printing machines known from US-PS No. 2,902,927, the control of the individual color zone adjustment means during the printing process is based solely on the operator's visual assessment of the printed sheet on an observation table. In addition, with the control device according to US-PS No. 2,902,927, a simultaneous adjustment of all color zone setting means can be made to adjust the total amount of color.

Contrary to the claims of DE-OS No. 2,632,017 and U.S. Pat. No. 3,390,447, the devices of DE-OS No. 2,434,680 and US-PS No. 2,902 .927 only adjusting the individual adjusting means, such as the adjusting means of the color knife, with regard to both the direction of adjustment and the size of the setting value itself, on the basis of the perception and experience of the operator, having no definite holding values for the size and direction of the adjustment to be made . Thus, the adjustment of the adjusting devices themselves, which affects the color output, can only be made on the basis of coarse visual assessment values based on estimates. An incorrect assessment of the color quality of the print product by the operator will mean that he must make several post-corrections of the adjusting means in order to ensure a color thickness profile corresponding to an optimal color density of the print product.

The object of the present invention is to provide a reliable operating control device which is simple in construction and similarly inexpensive in manufacture and which in order to facilitate the operation at a central control point of the service station, provides the operator with instructions on the setting direction and location of the interventions that he necessarily has to make based on a measurement technical assessment of the printed sheet in order to achieve a rapid optimization of the color scheme during the printing process.

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In this way, the operator must be able to adjust the color density measurement values with his personal value assessment of the quality of the print product on the basis of his visual assessment, in order to make the intended control interventions by simultaneously compensating for measurable non-detectable disturbance phenomena. In addition, if there is a relatively uniform level of deviation for all indication values, the operator must be able to make the fastest possible adjustment of the overall color scheme by a single control intervention independent of the individual zone color controls.

To achieve this, the control device according to the invention is characterized in that the control station is equipped as a measuring table which serves to receive the printed product for measurement and over which the measuring device is arranged, that the measuring table has a setting device for adjusting the total amount of color, and that an indicator device is provided for simultaneously indicating the deviations from a Color Density setpoint in all color zones as a deviation profile coherent across the width of the print product, indicating the direction of correction for adjusting the adjusting means and / or the adjusting device for adjusting the total color .

With this embodiment, a control device is obtained which meets the requirements set by simple means.

The aforementioned indication of the direction of adjustment of the color quantity from color density deviations during the printing process eliminates the risk of the operator making a wrong assessment of the printing product and a corresponding incorrect adjustment of the color output, in which his work is significantly simplified and necessary interior work is decisively reduced.

An advantageous embodiment of the device according to the invention is characterized in that the indication of the color density deviations from a set point which determines the correction direction is overlaid in the same indicator device by an indication of the intensity of these deviations within the range of preselected tolerances. This design allows the operator to achieve optimization of color performance in a very short time and thus a better print quality with the amount of shredding reduced to a minimum.

5 151131

A method of controlling the ink supply in ink works with a device according to the invention is characterized in that the printing product is taken from the printing machine and placed on the measuring table, where measurement of the ink density Er values of the ink product is compared with the predetermined ink values of the ink product. -Set values for finding color density difference values, which are stated in the indicator device coherently for all color zones within the range of selectable tolerances, that this indication is used as a direction, location, and value indication to change the color gradient of the zone color quantity and / or the total amount of color and that this color change is made via remote control using the controls.

The invention will be explained in more detail below with reference to the drawing, in which fig. 1 schematically shows a top view of a basic embodiment of the control device according to the invention with measuring table, and fig. 2 is a schematic top view of a preferred embodiment of the control device according to the invention.

It should be noted at the outset that the explanation and illustration of the invention are limited to its essential constituents, e.g. agents which serve for color application, control, operation and adjustment, and the interconnection of these agents is presumed known.

The FIG. 1, the basic embodiment of the control device according to the invention consists essentially of three parts, namely a measuring table 1 with a color density measuring device 2, an indicator device 3 placed on or above the upper end of the measuring table 1, and an electronic analyzing or evaluation device 4. , hereinafter referred to as "analyzer", located on the left side of the measuring table 1.

The measuring table 1 may be mounted directly on a rotary printing machine, or disposed as an independent unit independent of the machine. The measuring table 1 is connected via drive lines not shown to drive and adjusting means belonging to the means of a color supply device which determine both the zone color output and the total amount of color. As a color supply device, e.g. a color box with a duct roller and a through or split color knife, a paint spraying device or a centrifugal calf is used. As adjusting means, e.g. the stepper motors known from remote control devices are used.

The measuring table 1 serves to accurately capture and measure a print product 5 by means of the color density measuring device 2. In the basic embodiment, this color density measuring device consists of a single densitometer 6 which, viewed across the running direction of the printing product 5, can be moved over the entire width of the printing product 5. positionably slidable in a measuring beam 7. The measuring beam 7 itself can be moved in the longitudinal direction of the pressure product 5, it is slidably mounted in two lateral guides 8 immediately above the measuring table 1, so that any desired location on the pressure product 5 can be measured. .

The electronic analyzer 4 is connected via the wires not shown to the densitometer 6 and the indicator device 3 located at the upper end of the measuring table 1, and the analyzer 4 has an operating keyboard 9 and a numeric indicator 10.

The indicator device 3 located at the upper end of the measuring table 1, corresponding to the selected division of the corresponding indicator, has over its full width an arbitrary number of light indicators 11, each consisting of three LEDs 12, 13 and 14 arranged vertically below each other. . In the indicator device 3 included in the basic embodiment of FIG. 1, a light indicator 11 is associated with each of the color adjustment zones 22 included in the color scheme not shown, so that the number of color adjustment zones 22 corresponds to the number of the zone light indicators 11.

The control device of FIG. 1 works as follows.

During the printing process, a printing product 5 is taken from the printing machine and placed in the erected condition on the measuring table 1.

By means of the densitometer 6, using a pressure control strip 15 printed on the printing product 5, a measuring technical indication of the color density values of the printing product is now obtained. In the electronic analyzer 4, these values are then compared with the setpoint values that have been given in advance in the analyzer 4, and the print product 5 * color density deviations from these setpoint values - ie. deviations that go beyond the limits of the permissible preselected tolerances - are made visible in the indicator device 3.

Each of the zone indicator light indicators 11 of each of the indicator devices 3 belonging to each color setting zone allows for its three vertically arranged LEDs 12-14 as well as a trend indication for the color density deviations to change the direction of the color direction of the zone color quantity and / or the total color 7 151131 quantity, which outperforms this trend indication - in a number of several combination options, sorted into different, preselected tolerance classes - an intensity indication as the magnitude value for the change needed.

The trend that indicates whether a larger or smaller color input is to be indicated is that the upper or lower LEDs 12 and 14 respectively in a zone light indicator 11 are activated.

Various combination options for trend and intensity data are now available.

In a first combination step, only the middle LED 12 is activated in a zone light indicator 11. This means that the measured Er value for the full-color density of the printed product 5 corresponds to the predetermined set value for the full-tone color density, ie. that it is within the limits of a permitted and preselected tolerance. As there is no color density deviation, neither a trend nor an intensity indication is obtained. In this case, it is not necessary to intervene to change the color scheme.

In another combination option, both the middle and the lower LEDs 13 and 14, respectively, are activated in a zone light indicator 11. The activation of the lower LED 14 indicates a minus trend in the deviation of the measured Er value for the full-tone color density from the predetermined full-tone setpoint value. color density. The simultaneous activation of the middle LED 13 also provides information regarding the intensity of the occurrence of color density deviation. In such a case, viz. by simultaneously activating the middle and lower LEDs 13 and 14, respectively, there is only a slight minus deviation of the measured Er value for the full-tone color density - a deviation which, however, goes beyond a predetermined tolerance class and moves in the minus range until a deviation of eg. three tolerance classes relative to it. predetermined Set value for the full-tone color density.

In a third indication option, the activation of only the lower LED 14 in a zone indicator 11 indicates a negative trend, ie. a minus deviation of the measured Er value for the full-tone color density from the predetermined set-point value for the full-tone color density, a deviation which, however, goes beyond the framework of, for example, three predetermined tolerance classes.

In a fourth coiabination step, the top two LEDs 12 and 13 respectively in a zone light indicator 11 are activated simultaneously. Activation of the upper LED 12 gives a positive trend indication, ie. a plus deviation of the measured Er value for the full-tone color density relative to the predetermined Should - value for the full-tone color density. The simultaneous activation of the middle LED 13 furthermore allows one to join the intensity of the occurrence of color density deviation which is greater than a predetermined tolerance class, and e.g. lies in the range of one to three plus tolerance classes.

By a plus deviation of the measured Er value for the full tint density, e.g. a deviation of more than three predetermined plus tolerances, in a fifth step of combining possibilities only activation of the upper LED 12 in a zone light indicator 11. From this, one can thus conclude on a positive trend and high intensity of the color density deviation.

For a sixth light combination for a zone light indicator 11, in which all three LEDs 12-14 are activated simultaneously, an error measurement of the full-tone color density is indicated. The measured Er value for the full-color density of the printing product 5 is irregular and useless, e.g. due to measurement field fouling, fault pressure or other disturbance, ie. that the measurement must be verified.

When none of the three diodes 12-14 of a light indicator 11 are activated, there is no set value.

The tendency and intensity indication of the light indicators 11 means that, if there are inadmissible color density deviations, correction can be made for the zone color display by adjusting the color zone setting means not shown, the tendency indication serving as the directional magnitude of the greater or less color rendering of the intensity display. the size value for the required change.

If all the light indicators 11 distributed over the total width of the indicator device 3 jointly indicate an excessively large or too low color density and the activated LEDs are essentially at the same level, one can effectively correct for the incorrect color density in a particularly simple way. , namely by a one-time change of the total amount of color superimposed on the zone-based color rendering.

Within the scope of the invention, it is possible to have the tendency for the color rendering to be done in a different way than the one explained. It is for example.

9 151131 possible to indicate the trend by corresponding flashing of LEDs or by changing their light. Instead of using an analogue scale indicator or a digital indicator, e.g. in the form of an impulse counter for counting adjusting or cogging steps for the color zone setting means.

Each of the predetermined stored setpoint values for the full-tone color density of e.g. a ballot sheet, as well as each of them. In addition, measured Er values for the full-tone color density of the printing product 5, and each of the color density deviations in both direction and size found in the electronic analyzer 4 can be obtained by means of the analyzer 4's operating keyboard 9 and made visible in the analyzer numeric indicator 10.

The FIG. 2, the preferred embodiment of the control device according to the invention, which is expanded in relation to the basic embodiment of FIG. 1, in addition to the three main elements - ie. the measuring table 1 with the color density measuring device 2, the indicator device 3 which serves to indicate both the trend of the color density deviation as well as the deviation intensity, and the electronic analyzer 4 - a LED display 19 which is arranged on the lower end of the measuring table 1 and serves to indicate the color profile and, correspondingly, control elements 20 disposed therefor, as well as a ductor remote control 21 disposed on the right side of the measuring table 1. In this embodiment, a color density measuring device 2, which has changed substantially in relation to the color density measuring device, is also included. which is included in the basic embodiment of FIG. First

The LED display 19, which serves to indicate the color thickness profile, extends over the full width of the measuring table 1 and is divided into 32 color setting zones 22. For indicating the positions of the individual zone setting means, 32 LED rows each containing 16 vertically below each other are provided. placed LEDs 23 so that each color setting zone 22 includes a vertical LED row to indicate the position of the adjusting means.

Under the LED display 19, operating elements 20 are used in accordance with the color setting zones 22 to control the zone amount of color. The control elements 20 consist of 32 plus keys 24 which serve to increase the zone color quantity and 32 minus keys 25 which serve to reduce the color quantity.

By means of the control elements 20, the individual adjusting means for adjusting the zone amount of color are controlled via the control lines not shown. Each color zone setting means includes a potentiometer (not shown) which serves for position feedback or feedback of the position of the setting means in connection with the indication of the LED display1 of a 19 color color profile.

The duct remote control 21, which serves to change the total amount of color, has an input keypad 26 and a digital indicator 27. Similarly, as explained above in connection with the color zone remote setting, one can use the plus or minus key on the keypad 26 to increase or reduce the color strip width of the color duct not shown by changing its turning angle. The relative angle of rotation of the color inductor - relative to its maximum stroke - can thus be read as a percentage in the digital indicator 27.

The measuring bar 7, which is part of the color density measuring device 2 which is substantially changed in relation to the basic design, is divided into 31 individual measuring zones, with 16 measuring zones spaced apart and serving as full-tone measuring zones for measuring the full-color densities of the printing product 5, and an additional 15 free spaces located between these full-tone measurement zones and serve as grid-tone measurement zones for measuring the raster tint color densities of the printing product 5.

Accordingly, the measuring bar 7 has 16 full-tone measurement heads 28 spaced stationarily apart and serving to measure the full-color color density values of the printing product 5. For measuring the color density values in raster tone, there are 4 so-called "sprinkler measuring heads" 29 which can be inserted arbitrarily into the raster tone zones which lie between the full-tone measurement heads 28.

The measuring bar 7 can be shifted and adjusted in a lateral direction, ie across the running direction of the printing product 5, as it can be moved from a basic position 30 to three measuring positions 31-33 for measuring the three basic colors Cyan, Magenta and Yellow as well as the color Black in a four-color process. To this end, the measuring beam 7 has a rack 34 in which engages an adjusting gear wheel 35 which is mounted in a mounting portion 36 arranged stationary on the guide 8 of the measuring beam 7 and which can be rotated by a hand wheel 37.

In addition, on the movable measuring beam 7 is provided a four-part color index indicator 38 which cooperates with a color marking ring 39 on the mounting portion 36. The color index indicator 38 serves for setting and checking the basic position 30 and the different measuring positions 31-33 of the measuring beam 7.

In the embodiment of FIG. 2, the division of the indicator device 3 is further altered in such a way that every two color setting zones 22 includes a tendency and intensity indicator in the form of a zone light indicator 11. This light indicator is arranged in accordance with the full-tone measuring heads 28 belonging to the measuring beam. 7's full-tone measurement zones.

The control device of FIG. 2 works as follows.

By means of the measuring bar 7, with the spaced-apart full-scale measuring heads 28 and the spaced-apart four jumping measuring heads 29, four measurements are carried out one after the other, ie one measurement is performed for each color in the four-color print and after each measurement is made a lateral transverse displacement of the measuring bar 7 by turning the handwheel 37. Which color is measured instantaneously can be read on the color index indicator 38 on the measuring beam 7, in connection with the color marking 39 on the mounting part 36.

Thus, for each measurement, by virtue of the 16 full-tone measurement heads 28, a total of 16 measurement values for the full-tone color densities are obtained in a printing ink, whereby for each of the 32 color setting zones 22 a measurement value for the full-tone color density is obtained. After a transverse displacement of the measuring bar 7 three times, a total of 16 full-tone color density measurement values are obtained for all four inks.

At the same time, with the four jumper gauge hooks 29, the values for the raster toner densities in the four inks are obtained by measuring the raster gauge fields of the pressure control strip 15, thereby providing further information regarding the increase in pressure during shear and / or doubling as a result of adverse effects during the printing process, such as unwinding.

The full-tone measurement values are stored in color densities in the analyzer 4 and - within the limits of the preselected tolerances - are automatically compared with the should-be-entered values at the start of the printing process - full-color color density values of a print sheet. Similarly to the basic embodiment of FIG. 1 they are done this way

Claims (9)

151131, color density deviations detected automatically and routinely visible in the form of trend and intensity indications by means of the 16 zone light indicators of indicator device 3 11. Correspondingly, by means of the control elements 20, correction interventions can be made in the zone-specific or corrected needs according to the control elements 20. a corresponding change in the total amount of color by means of the keyboard 26 of the ductor remote control 21. both the indication of the color-thickness profile of the light-emitting diode display 19 as well as the trend and intensity indication by means of tubes, liquid crystals, via scale indicators with suitable indicator means or via digital indicators. In addition, a different partition of the indicator device 3, the LED display 19 and the measuring bar 7 can be selected, or other color density measuring devices can be used. Furthermore, an indicator device 3 with trend and intensity indicators for color density variances may be connected to several machines at one time. 1. A device for controlling the color input of a rotary printing machine with adjusting means in the individual color zones, a measuring device for detecting Er values for the color density of the individual color zones of a printing product, an analyzer for detecting the color density, and a control station with an indicator device belonging to the positions of the adjusting means in the individual color zones, characterized in that the control station is equipped as a measuring table (1) which serves to receive the printed product (5) for measurement and over which the measuring device (2) is arranged that the measuring table (1) has a setting device (21) for adjusting the total amount of color and that an indicator device (3) is provided for simultaneously indicating the deviations from a set value for the color density in all color zones as one over the whole the width of the pressure product (5), a coherent deviation profile indicating the correction direction for adjusting the setting the adjusting means and / or the adjusting device (21) for adjusting the total amount of color. 151131 Device · according to claim 1, characterized in that the indication of the color density deviations from a set point which determines the correction direction is overlaid in the same indicator device (3) by an indication of the intensity of these deviations within the frame of the prior art. selectable tolerances. Device according to claims 1-2, characterized in that the common indicator device (3) extends over the entire width of the printing product (5). Device according to claims 1-3, characterized in that for light indication there are several rows of LEDs (12, 13, 14) arranged vertically below each other. Device according to claims 1-4, characterized in that all the measured values, which are visually indicated by LEDs (12, 13, 14), can be read by selection on a numerical indicator (10). Device according to claims 1-5, characterized in that each color setting zone (22) has a color density deviation and intensity indicator. Device according to claims 1-6, characterized in that every two color setting zones (22) has a color density deviation and intensity indicator. Device according to claims 1-7, characterized in that both the zone adjusting means as well as the setting device for adjusting the total amount of color can be controlled remotely by means of controls (20, 21) and has a feedback device coupled to a digital indicator (27). Method for controlling the ink supply in color works with a device according to claim 1, characterized in that the printing product (5) is taken from the printing machine and placed on the measuring table (1), where the color density-Er-weathering of the printing product (5) is measured. means that the color density (Er) values of the printing product (5) are compared with predetermined color density set values for the color density difference values, which are stated in the indicator device (3) coherently for all color zones within the range of selectable tolerances, that this indication is used as direction, location and value indication to change the color scheme of the zone quantity and / or the total amount of color, and this change of color scheme is made via remote control by means of the controls (20 and / or 21).