EP2566695B1 - Method for setting and device for determining an optimal operating distance between at least two cylinders of a printing unit involved in the printing process - Google Patents
Method for setting and device for determining an optimal operating distance between at least two cylinders of a printing unit involved in the printing process Download PDFInfo
- Publication number
- EP2566695B1 EP2566695B1 EP11717678.4A EP11717678A EP2566695B1 EP 2566695 B1 EP2566695 B1 EP 2566695B1 EP 11717678 A EP11717678 A EP 11717678A EP 2566695 B1 EP2566695 B1 EP 2566695B1
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- European Patent Office
- Prior art keywords
- cylinders
- cylinder
- ink
- change
- ink film
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F3/00—Cylinder presses, i.e. presses essentially comprising at least one cylinder co-operating with at least one flat type-bed
- B41F3/46—Details
- B41F3/58—Driving, synchronising, or control gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/30—Arrangements for tripping, lifting, adjusting, or removing inking rollers; Supports, bearings, or forks therefor
- B41F31/32—Lifting or adjusting devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F13/00—Common details of rotary presses or machines
- B41F13/08—Cylinders
- B41F13/10—Forme cylinders
- B41F13/12—Registering devices
- B41F13/14—Registering devices with means for displacing the cylinders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F31/00—Inking arrangements or devices
- B41F31/30—Arrangements for tripping, lifting, adjusting, or removing inking rollers; Supports, bearings, or forks therefor
- B41F31/301—Devices for tripping and adjusting form rollers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0063—Devices for measuring the thickness of liquid films on rollers or cylinders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F5/00—Rotary letterpress machines
- B41F5/20—Rotary letterpress machines specially adapted for proof printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F5/00—Rotary letterpress machines
- B41F5/24—Rotary letterpress machines for flexographic printing
Definitions
- the invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 23.
- the distance between at least two cylinders involved in the printing process of a printing unit is set. This is necessary in various printing processes prior to recording the actual printing operation. So should the DE 44 27 967 B4 attributable to the offset printing process.
- the EP 1 249 346 B1 To observe the printed image of the printing press on the substrate during the adjustment of the rollers with optical sensors. On the basis of the measured values, a control device determines the optimized relative position of the rollers involved in the printing process and adjusts them. Since according to this teaching, the measurement of the - still faulty - print image on the substrate is the basis for the adjustment of the printing roller position, waste is inevitably generated during the adjustment of the roller position.
- this document proposes to measure the diameter of format cylinders. Due to the measurement results obtained on the format cylinder, a control device determines the optimized relative position of the format cylinder to the other cylinders involved in the printing process. Based on these values, the control device of the printing press adjusts the position of the format cylinder in the printing press. In this way should be printed wastepaper.
- This color strip can be measured inter alia with a CCD camera after the second roller has been rotated by an angle from the contact position to a position in which the resulting color strip can be viewed.
- the width of the color strip is a measure of the pressure between the rollers, so that at a certain width of the right pressure can be assumed. If the strip has a right-angled shape (same width), the main axes of symmetry of the two rolls run parallel.
- just the color strip which consists of dried ink, reduce the print quality at the start of printing and thus lead to the accumulation of waste again.
- the aforementioned method for optimizing the printing cylinder positions after the DE 102 11 870 A1 also involves a great deal of time, since the cylinders must be stopped as mentioned for a certain period of time, so that the color stripe is pronounced on the second cylinder.
- the present invention is based on the latter document. Its task is to remedy the aforementioned disadvantages of the same.
- the object is solved by the characterizing features of claims 1 and 23.
- the change in the color film may consist of a decrease in the color transported by the cylinder in question. However, even without such a decrease in color, it may happen that the surface of the color film changes as a result of a contact pressure. Further details of the phenomena mentioned are discussed above all in the present description.
- the cylinders can rotate continuously. It is advantageous to carry out at least one continuous rotation (360 ° about the main axis of symmetry), at least two or more such rotations. In a part of the method according to the invention, the cylinders rotate during the entire measurement or keystroke.
- a basic idea of the present invention is therefore to detect the change of the color film on a color-transferring cylinder.
- the measurement is performed on at least one cylinder, which in the color transport direction (23) is preceded by the second color-receiving cylinder (7) during the printing process.
- it is measured on a cylinder upstream of the nip in the color transporting direction, the nip being limited by the two cylinders whose pitch is being adjusted. It can therefore be measured on the first cylinder that limits the gap.
- the position between the anilox roll and the format cylinder can be optimized on the basis of the observation of the anilox roll without waste being produced.
- An employment of the well-positioned roll stack anilox roller / form cylinder against the impression cylinder can then be made under the production of waste paper.
- the setting of the roll spacing will be made on the basis of the measured values on the basis of a control device set up for this purpose.
- the control devices will usually be charged with a corresponding computer program.
- Ever is It is advantageous to carry out or support all methods according to the invention in this way in a computer-implemented manner.
- the method is advantageous.
- the color decrease of the gravure cylinder - so the printing plate cylinder - are measured.
- the impression roller or general impression cylinder is in this case involved in the printing process, but does not participate in the color transport to the substrate or in the printing nip.
- the process has its advantages in two rolls as well as in a color transport over several cylinders and a measurement of the ink film on one of the front rollers.
- the covering of the surface of the roller with color also changes in the last-mentioned case, when the rollers in the color transporting direction are turned against the following roller or the printing material and ink is actually transported onto the printing material.
- an adjustment of the cylinders relative to each other by an empirically or computationally determined offset value - ie a further approximation of the cylinders by a distance amount - after reaching this "kiss-print point" or here a first optimized relative position - be brought about by the control device.
- an optimized working distance between the cylinders in question which is just not usually given when reaching a KissPrint lies, can be achieved.
- An essential alternative to this procedure is to continue the approach of the cylinder with simultaneous evaluation - "the measurement run" - until a primary threshold or tolerance value - in this case the color decrease - is reached.
- This primary threshold value can be chosen so that when the primary threshold value is exceeded, the optimized working distance between the cylinders has already been reached, so that no further measures are required in this regard. Accordingly, the adjustment of the relative position of the rollers would be terminated at the end of the measuring run and the optimized working distance would coincide with the first optimized relative position. However, this can also be achieved. Threshold for the color decrease on the cylinder on which is measured, a further approximation of the cylinder by an amount of distance ("offset value”) are additionally brought about. Another way to determine an optimized Druckbeistellsituation is to follow the course of color reduction as a function of relative roll position.
- an optimized relative print position is a "secondary threshold" (ie, a further amount of color decrease) or an "offset value" (ie, a certain amount of travel) away from such a characteristic point.
- test drive can also be ended here.
- Process steps such as recording the function change of the color film / relative roller position, ending the test drive, finding one or more characteristic points of this function, switching on a threshold value and / or offset value can be carried out computer-implemented by the control device.
- the offset values and the secondary threshold values can be used in connection with all presented methods which determine the duration of the measuring run.
- the sign of the offset values ("more or less provision") or the secondary threshold values (more or less color transfer) can be positive or negative.
- the maximum measuring range of the sensor device will be based on the maximum pressure range (often equal to or slightly larger).
- One way to realize this is to use a line scan camera that can map the maximum print width. This camera is suspended in a working position in which it can cover the printing area of the machine to the cylinder in question. It makes sense to divide the entire measuring range of the sensor system into subareas.
- the sensor system itself can be modular - z. B. from photodiodes. In this case, the modules of the sensor system will already provide partial images of the entire measuring range, which then no longer needs to be decomposed by a computer unit into subareas.
- the optimized Anstellsituation should advantageously be considered achieved when the conditions of the respective method are achieved in a subset of the sub-areas.
- sensor devices come as mentioned optical sensors such as cameras in question.
- optical sensors and cameras is used in this context, even if non-visible electromagnetic radiation can be recorded. If electromagnetic radiation is measured, the spectral light intensity is an advantageous measured variable (light intensity per spectral range per area). In this case, it is advantageous to provide a special radiation source which radiates suitable radiation onto the roller. The sensors then measure the remitted radiation. When mounting the radiation source and sensor, the laws of reflection are generally to be observed (which is shown inter alia in the figures).
- a device for determining an optimized working distance between two cylinders involved in the printing process may be a printing unit of special equipment or it may be an external drawing from the perspective of the printing press with corresponding additional features. These devices have in common that recordings in which the printing cylinder are rotatably mounted and against each other are available, are present.
- the preparation of the printing plate cylinder on the printing in other words its equipment with the printing plate, can be carried out in an external stretching unit.
- such a bar may additionally be provided with device features inherent to so-called stands, which are typically used for the armor of flexographic printing format cylinders. Such a device is used for example in the US 5,132,911 B described.
- stretching devices have become known in which a format cylinder is also rotatably mounted.
- this cylinder is provided with a smooth yet completely unprocessed rubber-like cliché, which is processed by a laser ablation unit such that forms the desired printing form.
- a device according to the invention can also be equipped with such a laser ablation unit or another engraving unit for processing the cliché.
- Such a unit will be in the WO 9713641 shown. If the invention is realized in an external unit, then it is not even necessary to actually set the finally held for optimal relative distance between the cylinders involved in the external unit. Rather, it is then necessary to pass on the determined data to the actual printing press, which then also sets these values.
- the device components which are regular in an inking unit, but which are usually absent in an external tray, include a coloring device.
- a coloring device may be rudimentary. It can also be loaded with a special test color.
- Such a text color may be similar Color split properties but have different optical properties ("easier to measure") than the actual color.
- the quality of the color film on a roller - in the drawing unit or in the inking unit - can also be determined by capacitive sensors.
- the thickness of the ink film on the surface of the measured roll influences the capacitive measurement.
- an uneven structure of a color film should also play a role here.
- the development of the ink film on the roller can also be observed during the printing operation. In this way, dynamic changes in the pressure conditions can be detected with respect to the printing operation. It can be responded to these changes in the current printing operation (eg by other adjustment of the rollers or by changing the viscosity of the ink).
- the change in the color film on the at least one color-transporting cylinder can be carried out with the roller rotating.
- the measurement can take place while the cylinders - or the cylinders whose relative position is being optimized - are set against each other in the vicinity of their kissprint point and, if necessary, during a measuring run to find an optimized printing position. Moving the rollers apart to perform the measurement is usually unnecessary.
- sensors are shown, which are mounted in a working or measuring position to a color-transporting roller. With optical sensors - cameras - radiation sources are often provided. It has been shown that measurements on the ink-transporting rolls, which are possible with the sensors shown, also allow other variables or phenomena relevant to the printing process to be measured or determined. These are explained below in relation to the observation of a flexographic printing plate roller:
- the quality of the coloring of the anilox roller - which is usually carried out by a doctoring chamber - can be monitored before or during the printing process. This is very important because it still happens that there is little or no color on the roller, which of course negatively affects the printed image.
- dry-running rolls of all kinds can also cause inflammations and explosions in printing presses, so that the recognition of the dry roll can be used for "explosion protection" (eg pressure drop or warning signal).
- Paint deposits which can lead to so-called ghosting, or squeegee strips, which can come about by an over-hired and / or vibrating doctor blade on the surface of the anilox roller can be detected with the sensors.
- the doctor blade offers an adjustment of the doctor blade. strips on the anilox roller can also be caused by vibrations in the inking unit. Such vibrations often lead to very regular thickness variations of the ink film on the roller.
- register marks On the basis of significant points in the above-mentioned negative image of the printed image on the anilox roller or using specially provided for this purpose register marks, which are also imaged in the negative image, can also register or Vorregisterung the print image-carrying cylinder - in flexographic printing of the format cylinder - to the print image-carrying cylinder at least be made of another inking unit.
- the significant point or the mark on the surface of the anilox roller is detected at a time and the angular position of the anilox roller at this time z. B. recorded with a rotary encoder.
- a significant point or mark on the surface of the anilox roll of the further inking unit must then be brought into a suitable relative angular position. This circumstance would also be checked with an optical sensor and a rotary encoder. This method would, for example, enable a scratch-free pre-register.
- the above methods can be advantageously combined with the methods for adjusting the relative position of the at least two rollers involved in the printing process. Both types of methods have surprising advantages when performed by measurements on cylinders having uneven surfaces, such as anilox rolls, form cylinders, or form cylinders. Smooth rollers generally result in lower signal-to-noise ratios.
- Fig. 1 is a schematic diagram of a Monzylinderflexodruckmaschine 15, in which the printing units or inking units 2, 3, 4 and 5 are arranged around the central impression cylinder 1 around.
- the inking units 2, 3 and 4 are shown only with dashed lines, since a closer look at the inking unit 5 is sufficient at this point.
- the squeegee chamber 6 transfers ink to the surface of the anilox roller 7.
- This 7 transports the ink by its rotation further to the format cylinder 8.
- the format cylinder 8 carries the raised plate 11, the color of the surface of the anilox roller 7 decreases.
- a zone is therefore formed in the contact region 10 between the plate 11 of the format cylinder 8 and the anilox roller 7, in which color loss occurs.
- FIG. 3 again shows a basically the same design printing machine 15.
- FIG. 2 shown camera 17 is in the direction of rotation 14 of the anilox roller 7 of the doctoring chamber 6 downstream camera 19 to see. With this camera, the quality of the coloring of the anilox roller 7 can be controlled by the doctor chamber 6.
- Such a structure is also in the sectional view of the inking unit 5 in FIG. 4 to see.
- the format cylinder 8 has been shown with two clichés 11. It is shown that the anilox roller 7 in the contact region 10 has no undisturbed ink film 22, as in its remaining peripheral surface, more.
- her color reservoir 20 and her doctor blade 21 can be seen.
- the arrow 23 symbolizes the transport direction of the color.
- FIG. 5 again shows the printing press 15 in a similar manner as the FIGS. 1 to 3 , However, this time instead of the line camera 17 in the inking unit 5, the movable camera 24 is shown. It is movable along a rail, not shown, in the axial direction of the anilox roller 7. This is shown by the arrows 25.
- the camera shown can cover at one time only portions of the interface 10 between the cylinders 7 and 8. It would also be possible to provide a plurality of such movable cameras 24 or to attach one or more cameras, which can cover only smaller portions of the area, stationary. It has been shown that even such cameras are completely sufficient in certain applications.
- sensors such as reflection sensors or light scanners, which are already being used as register sensors in series printing machines, come into question.
- These sensors have optical fibers (typically glass fiber based) that both direct light to the viewing area and derive the light returned from the roll surface (usually after being collected by a lens or the like) for measurement. Thanks to the light guides, both the radiation source and the analysis unit are in a roughly installed position at a distance from the measuring point.
- the mentioned sensors are to be acquired as highly integrated (among others mechanically loadable and relatively insensitive to chemical influences) components.
- FIG. 9 shows once again composed of the modules 18 line scan 17, which in the direction of rotation of the anilox roller 7 in FIG. 2 the doctor chamber 6 is upstream.
- the orientation in the z direction also corresponds to the symbol of the line scan camera 17 (dashed rectangle) in FIG FIG. 8 , In FIG.
- the modules 18 of the line camera are shown as diode modules, which are connected to the line system 26 with each other.
- FIG. 8 the orientation of the line camera 17 to the anilox roller 7 can be seen.
- Two portions of the camera 27 and 28, which are detected by a respective camera module 18, are highlighted by dashed circles.
- the portion 27 is located at an end edge of the anilox roller 7 and is provided with an unimpaired ink film 22 during operation of the printing press.
- the portion 28 belongs to the touch area 10. The consequences of these circumstances are in the FIGS. 6 and 7 shown, the magnifications of the portion 28 ( FIG. 6 ) and 27 ( FIG. 7 ). In the portion 27, the wells 30 of the anilox roller 7 are filled with color 29.
- the distance of the rollers changes in their radial direction r.
- the relative position of the two rollers can also be changed in other ways.
- FIG. 10 The exemplary embodiment shown is based on a measurement of the light remitted by the ink-transporting roller or on the measurement of the intensity I of this light. At the beginning of the measurement run, symbolized by the bracket 32, where the light intensity values which result as a function of the approach of the rolls (the roll spacing decreases from left to right as one roll is turned to the other in the x-direction) are measured, the light intensity does not change.
- this leg may be based on calculations or empirics. Achieving the optimized working distance 38 can be verified by measurements, which often is not necessary. Also in FIG. 11 and the remaining figures, the approach of the two rollers due to the employment of a roller in the x-direction against the other against the remitted light intensity I is applied. Also in FIG. 11 the light intensity initially remains at its maximum 42, since no color transfer takes place. Again at point 31 the color transfer begins. However, the measuring run 32 does not end at the moment in which the drop in the light intensity exceeds a detection threshold 35, but at the moment in which the drop in the light intensity exceeds a predetermined threshold value 33.
- Offset 34 is an approximation of the rolls by a distance amount. This can be controlled by the machine control and, if necessary, measured by position sensors such as encoders in spindle motors. If a threshold value 33 (at light intensity l) is set, the distance between the rollers (by changing x) is changed until the threshold value is reached. This results in an adjustment amount 39 to the threshold value 33.
- FIG. 21 is similar in this respect FIG. 5 is shown as an anilox roller 7, which is scanned by a movable camera. In FIG. 21 However, it is indicated that the camera 24 scans the roller at a time, since this is already colored with a color film 22 at the places that can ever roll with the format cylinder 8 - as the second cylinder to which the anilox roller transfers color.
- the curve TM overcomes the dashed curves G1 or G2.
- the course of the difference between reference values R and tactile values TM can also be used as the basis for setting the relative roll positions.
- the difference TM-R - each in a certain angular position ⁇ 1 is derived after ⁇ . If the derivative exceeds a certain discharge limit K, the optimized roll position has been reached: d ⁇ TM ⁇ 1 - R ⁇ 1 / d ⁇ > K
- the ordinate is denoted by -I. This measure takes into account the fact that as a result of the color removal and / or the degradation of the color film in the contact region 10, a significant decrease in the intensity of the remitted light occurs, at least in a specific spectral range.
- the sensors 17, 19, 24 shown in the figures are swung out of the area of the inking unit after the roller has been scanned. In this case, the sensitive sensors are no longer polluted in the further printing operation.
- a cleaning can take place, which can be carried out for example by a dedicated cleaning device. In this position, a recalibration of the sensor can be made.
- the spectral sensitivity ranges of the sensors can be adjusted by filters and / or by applying a different countervoltage to the semiconductor diodes.
Description
Die Erfindung betrifft ein Verfahren nach dem Oberbegriff des Anspruchs 1 und eine Vorrichtung nach dem Oberbegriff des Anspruchs 23. Mit solchen Vorrichtungen und Verfahren wird der Abstand zwischen zumindest zwei am Druckprozess beteiligten Zylindern eines Druckwerks eingestellt.
Dies ist bei verschiedenen Druckverfahren vor einer Aufnahme des eigentlichen Druckbetriebes nötig. So dürfte die
Von besonderem Interesse ist die Optimierung der Anstellung im Bereich des Flexodrucks, da hier relativ dicke, sehr flexible Druckformen verwendet werden, welche - insbesondere zusammen mit ihrem Unterbau - große Dickentoleranzen aufweisen. In diesem Zusammenhang schlägt die
This is necessary in various printing processes prior to recording the actual printing operation. So should the
Of particular interest is the optimization of employment in the field of flexographic printing, since relatively thick, very flexible printing plates are used, which - in particular together with their substructure - have large thickness tolerances. In this context, the
Dieser Umstand wird von der
Diese Lehre lässt jedoch außer Acht, dass neben den reinen Abmessungen der Druckform auch Größen wie deren Elastizitätsmodul oder das Farbspaltungsverhalten der jeweils verdruckten Farbe Einfluss auf das Druckergebnis haben.
Eine weitere Druckschrift, die sich mit der Optimierung der Farbübertragung von am Druckprozess beteiligten Walzen im Offsetdruckprozess befasst, ist die
Dieser Farbstreifen kann unter anderem mit einer CCD-Kamera ausgemessen werden, nachdem die zweite Walze um einen Winkel von der Kontaktstellung in eine Stellung gedreht worden ist, in der der entstandene Farbstreifen eingesehen werden kann.
Die Breite des Farbstreifens ist ein Maß für den Anspressdruck zwischen den Walzen, so dass bei einer gewissen Breite vom richtigen Druck ausgegangen werden kann. Falls der Streifen eine Rechtsecksform (gleiche Breite) aufweist, verlaufen die Hauptsymmetrieachsen der beiden Walzen parallel.
Darüber hinaus kann gerade der Farbstreifen, der aus angetrockneter Farbe besteht, die Druckqualität bei Druckbeginn herabsetzen und damit wieder zum Anfall von Makulatur führen.However, this teaching disregards that in addition to the pure dimensions of the printing form, variables such as their modulus of elasticity or the color-splitting behavior of the color printed in each case also influence the printing result.
Another document which deals with the optimization of the color transfer of rolls involved in the printing process in the offset printing process is the
This color strip can be measured inter alia with a CCD camera after the second roller has been rotated by an angle from the contact position to a position in which the resulting color strip can be viewed.
The width of the color strip is a measure of the pressure between the rollers, so that at a certain width of the right pressure can be assumed. If the strip has a right-angled shape (same width), the main axes of symmetry of the two rolls run parallel.
In addition, just the color strip, which consists of dried ink, reduce the print quality at the start of printing and thus lead to the accumulation of waste again.
Das vorerwähnte Verfahren zur Optimierung der Druckzylinderpositionen nach der
Die vorliegende Erfindung geht von der letztgenannten Druckschrift aus. Sie hat die Aufgabe, die vorgenannten Nachteile derselben zu beheben.
Die Aufgabe wird durch die kennzeichnenden Merkmale der Ansprüche 1 und 23 gelöst. Die Veränderung des Farbfilms kann in einer Abnahme der Farbe, die von dem betreffenden Zylinder transportiert wird, bestehen. Es kann jedoch auch ohne eine solche Abnahme der Farbe dazu kommen, dass sich die Oberfläche des Farbfilms in Folge eines Anstelldruckes verändert. Weitere Einzelheiten zu den erwähnten Phänomenen werden vor allem in der gegenständlichen Beschreibung diskutiert.The present invention is based on the latter document. Its task is to remedy the aforementioned disadvantages of the same.
The object is solved by the characterizing features of
Bei dem erfindungsgemäßen Verfahren ist es weiterhin vorgesehen, den Farbfilm bei sich drehenden Zylindern zu untersuchen. Hierbei können die Zylinder sich kontinuierlich drehen. Es ist vorteilhaft zumindest eine kontinuierliche Drehung (360° um die Hauptsymmetrieachse), zumindest zwei oder mehrere solcher Drehungen durchzuführen. Bei einem Teil der erfindungsgemäßen Verfahren drehen sich die Zylinder während der ganzen Mess- oder Tastfahrt.In the method according to the invention, it is further provided to examine the ink film in rotating cylinders. Here, the cylinders can rotate continuously. It is advantageous to carry out at least one continuous rotation (360 ° about the main axis of symmetry), at least two or more such rotations. In a part of the method according to the invention, the cylinders rotate during the entire measurement or keystroke.
Interessanterweise ist es auch möglich, eine Berührung zwischen nachgelagerten farbtransportierenden Zylindern auf einem vorgelagerten Zylinder zu messen, ohne dass ein Druckprozess stattfindet, das heißt ohne dass der Bedruckstoff die Farbe endgültig abtransportiert.Interestingly, it is also possible to measure a contact between downstream color-transporting cylinders on an upstream cylinder, without a printing process takes place, that is, without the substrate finally removes the color.
Gerade in diesem Zusammenhang ist es jedoch vorteilhaft, die Messung und Einstellung des Arbeitsabstandes innerhalb von wenigen Umdrehungen vorzunehmen (z.B. 1, 2 oder 3), da sich sonst im Bereich der Abtastfläche Sättigungseffekte ausprägen.Especially in this context, however, it is advantageous to carry out the measurement and adjustment of the working distance within a few revolutions (for example 1, 2 or 3), since otherwise saturation effects are manifested in the region of the scanning surface.
Ein Grundgedanke der vorliegenden Erfindung besteht also darin, die Änderung des Farbfilms auf einem farbübertragenden Zylinder zu detektieren. Hierbei wird die Messung auf zumindest einem Zylinder vorgenommen, der in der Farbtransportrichtung (23) dem zweiten während des Druckprozesses Farbe empfangenden Zylinder (7) vorgelagert ist.
Anders ausgedrückt wird auf einem Zylinder gemessen, der dem Walzenspalt in Farbtransportrichtung vorgelagert ist, wobei der Walzenspalt von den beiden Zylindern begrenzt wird, deren Abstand eingestellt wird. Es kann also auf dem ersten Zylinder, der den Spalt begrenzt, gemessen werden. Alternativ oder ergänzend kann auch auf einem in Farbtransportrichtung weiter vorgelagerten Zylinder gemessen werden.A basic idea of the present invention is therefore to detect the change of the color film on a color-transferring cylinder. In this case, the measurement is performed on at least one cylinder, which in the color transport direction (23) is preceded by the second color-receiving cylinder (7) during the printing process.
In other words, it is measured on a cylinder upstream of the nip in the color transporting direction, the nip being limited by the two cylinders whose pitch is being adjusted. It can therefore be measured on the first cylinder that limits the gap. Alternatively or additionally, it is also possible to measure on a cylinder which is further upstream in the color transport direction.
In der beschriebenen Weise kann auch ein unter realistischen Voraussetzungen zustande gekommener Farbübertrag der Auffindung der optimierten Relativpositionen der Walzen zugrunde gelegt werden, ohne dass notwendigerweise Makulatur entsteht.
So kann bei Flexodruckmaschinen die Anstellung zwischen Rasterwalze und Formatzylinder auf der Grundlage der Beobachtung der Rasterwalze optimiert werden, ohne dass Makulatur anfällt. Eine Anstellung des gut zueinander positionierten Walzenpakets Rasterwalze/Formatzylinder gegen den Gegendruckzylinder kann dann unter der Produktion von Makulatur vorgenommen werden. Versuche haben gezeigt, dass es in dem letztgenannten Fall auch möglich ist, den Kontakt zwischen dem Formatzylinder und dem Bedruckstoff auf der Rasterwalze festzustellen: Hier verschwinden nun Farbschlieren, die sich durch den mangelnden Farbabtransport auf den Bedruckstoff gebildet haben.
Nachzutragen ist, dass sich die Relativposition der beiden bereits gegeneinander angestellten Zylinder - hier Rasterwalze und Formatzylinder-bei der Anstellung an den Gegendruckzylinder vorteilhafterweise nicht ändern sollte.
An dieser Stelle sei noch einmal ausdrücklich erwähnt, dass auch ein Gegendruckzylinder, der Bedruckstoff an seiner Oberfläche führt, so dass dem Bedruckstoff im Druckbetrieb Farbe übertragen wird, im Sinne dieser Druckschrift ein Farbe empfangender Zylinder ist.In the manner described, it is also possible to base the finding of the optimized relative positions of the rolls under realistic conditions on the transfer of color, without necessarily resulting in waste.
Thus, in the case of flexographic printing presses, the position between the anilox roll and the format cylinder can be optimized on the basis of the observation of the anilox roll without waste being produced. An employment of the well-positioned roll stack anilox roller / form cylinder against the impression cylinder can then be made under the production of waste paper. Experiments have shown that in the latter case it is also possible to determine the contact between the format cylinder and the printing material on the anilox roller: Here, color streaks, which have formed due to the lack of ink removal on the printing material, disappear.
It should be added that the relative position of the two cylinders which are already set against each other - in this case the anilox roller and the format cylinder - should advantageously not change during the adjustment to the impression cylinder.
At this point, it is expressly mentioned once again that an impression cylinder which carries printing material on its surface, so that the printing material is transferred in the printing operation color, in the sense of this document is a color-receiving cylinder.
In der Regel wird die Einstellung des Walzenabstandes aufgrund der Messwerte aufgrund einer dazu eingerichteten Steuervorrichtung vorgenommen werden. Hierzu wird die Steuervorrichtungen in der Regel mit einem dementsprechenden Computerprogramm beaufschlagt werden. Überhaupt ist es vorteilhaft, alle erfindungsgemäßen Verfahren in dieser Weise computerimplementiert durchzuführen oder zu unterstützen.As a rule, the setting of the roll spacing will be made on the basis of the measured values on the basis of a control device set up for this purpose. For this purpose, the control devices will usually be charged with a corresponding computer program. Ever is It is advantageous to carry out or support all methods according to the invention in this way in a computer-implemented manner.
Auch bei dem Vorhandensein von nur zwei Walzen ist das Verfahren von Vorteil. So kann bei Tiefdruckmaschinen zum Beispiel die Farbabnahme von dem Gravurzylinder - also dem Druckplattenzylinder - gemessen werden. Der Presseur oder allgemeiner Gegendruckzylinder ist in diesem Falle am Druckprozess beteiligt, nimmt aber nicht am Farbtransport zum Bedruckstoff oder in den Druckspalt teil.
Damit hat das Verfahren sowohl bei zwei Walzen als auch bei einem Farbtransport über mehrere Zylinder und einer Messung des Farbfilms auf einer der vorderen Walzen seine Vorteile. Wie erwähnt ändert sich auch in diesem letztgenannten Fall die Deckung der Oberfläche der Walze mit Farbe, wenn die in Farbtransportrichtung hinteren Walzen gegen die nachfolgende Walze oder den Bedruckstoff angestellt sind und tatsächlich Farbe auf den Bedruckstoff transportiert wird.
Wie ebenfalls bereits angesprochen ist es vorteilhaft, den Farbfilm einer beispielsweise im Flexodruck verwendeten Rasterwalze zu beobachten. Diese wird vor allem Farbe verlieren, wenn weitere Zylinder angestellt werden.
Aber auch Glattwalzen werden in verschiedenen Druckverfahren zur Einfärbung weiterer am Druckprozess beteiligter Walzen verwendet.
Nachzutragen ist an dieser Stelle, dass die Begriffe Walze und Zylinder in dieser Druckschrift gegeneinander austauschbar oder äquivalent verwendet werden.
Bei der Ermittlung der optimierten Relativposition der zumindest zwei Walzen ist die Frage, wie stark die Änderung der Flächendeckung auf der Walze sein muss, damit die Steuervorrichtung erste Anhaltspunkte für einen optimierten Walzenabstand hat und die Messfahrt beendet. Unter "Messfahrt" wird in diesem Zusammenhang die Phase der Annäherung der Walzen verstanden, in der Messwerte gewonnen werden, die zur Bestimmung einer ersten optimierten Relativposition herangezogen werden.
Eine Möglichkeit besteht darin, die Messfahrt zu beenden, sobald sich eine Änderung des Farbfilms auf der Walze, an der gemessen wird, abzeichnet. Natürlich ist die Menge an Farbe, die zu diesem Zeitpunkt übertragen wird, von der Empfindlichkeit des Messsystems abhängig. In der Regel dürfte sich jedoch auf diese Weise eine Anstellsituation finden lassen, die dem Drucker als "Kissprint" bekannt ist. Hier findet eine erste leichte Berührung zwischen den Walzen statt.
An diesem Punkt kann beispielsweise die weitere Messung der Farbübertragung beendet werden. Eine weitere Annäherung kann jedoch - bei Bedarf - von der Steuervorrichtung durchgeführt werden. So kann eine Anstellung der Zylinder gegeneinander um einen empirisch oder rechnerisch ermittelten Offsetwert - also eine weitere Annäherung der Zylinder um einen Streckenbetrag - nach Erreichen dieses "Kiss-Printpunktes" oder hier einer ersten optimierten Relativposition - von der Steuervorrichtung herbeigeführt werden. Auf diese Weise kann dann ein optimierter Arbeitsabstand zwischen den betreffenden Zylindern, die eben in aller Regel bei Erreichen eines KissPrintpunktes noch nicht gegeben ist, erreicht werden.
Eine wesentliche Alternative zu diesem Vorgehen besteht darin, die Annäherung der Zylinder bei gleichzeitiger ausgewerteter Messung - "die Messfahrt" - weiter fortzusetzen, bis ein primärer Schwellwert oder Toleranzwert - hier der Farbabnahme - erreicht ist. Dieser primäre Schwellwert kann so gewählt sein, dass bei Überschreiten des primären Schwellwertes bereits der optimierte Arbeitsabstand zwischen den Zylindern erreicht ist, so dass in dieser Beziehung keine weiteren Maßnahmen mehr erforderlich sind. Demnach wäre die Einstellung der Relativposition der Walzen mit dem Ende der Messfahrt beendet und der optimierte Arbeitsabstand würde mit der ersten optimierten Relativposition zusammenfallen. Jedoch kann auch bei Erreichen dieses. Schwellwertes für die Farbabnahme auf dem Zylinder, auf dem gemessen wird, eine weitere Annäherung der Zylinder um einen Streckenbetrag ("Offsetwert") zusätzlich herbeigeführt werden.
Eine weitere Möglichkeit, eine optimierte Druckbeistellsituation zu ermitteln, besteht darin, den Verlauf der Farbabnahme als Funktion der relativen Walzenposition zu verfolgen. Dann besteht die Möglichkeit, bei Eintritt eines charakteristischen Verlaufs dieser Funktion aufgrund von Erfahrungen und Berechnungen von dem Erreichen der optimierten relativen Druckposition der Zylinder auszugehen. So zeichnet sich das Erreichen der optimierten Druckposition der Zylinder häufig frühzeitig ab, da der Farbübertrag nach Erreichen dieser Position kaum noch steigt, sondern bei weiterer Annäherung der Walzen in einen Sättigungsbereich eintritt. Aufgrund dieser Sachverhalte besitzt die in Rede stehende Funktion oft im Bereich der optimierten Druckposition Wendepunkte oder relative Maxima. Charakteristische Punkte dieser Art können von der Steuervorrichtung zur Ermittlung der optimierten Druckposition genutzt werden. Oft befindet sich eine optimierte relative Druckposition einen "sekundären Schwellwert" (d.h. einen weiteren Betrag an Farbabnahme) oder einen "Offsetwert" (d.h. einen gewissen Streckenbetrag) von einem solchen charakteristischen Punkt entfernt. Wenn der Verlauf der Funktion weit genug aufgezeichnet ist, um die Lage solcher Punkte zu errechnen, kann die Messfahrt auch hier beendet werden.
Verfahrensschritte wie Aufzeichnung der Funktion Änderung des Farbfilms/relative Walzenposition, Beenden der Messfahrt, Auffinden eines oder mehrerer charakteristischer Punkte dieser Funktion, Aufschaltung eines Schwellwertes und/oder Offsetwertes können computerimplementiert von der Steuervorrichtung vorgenommen werden. Dies gilt natürlich auch für die anderen in dieser Druckschrift vorgestellten Verfahren.
Den vorstehenden Ausführungen ist zu entnehmen, dass die Offsetwerte und die sekundären Schwellwerte in Zusammenhang mit allen vorgestellten Verfahren, die die Dauer der Messfahrt bestimmen, eingesetzt werden können. Das Vorzeichen der Offsetwerte ("mehr oder weniger Beistellung") oder der sekundären Schwellwerte (mehr oder weniger Farbübertrag) kann hierbei positiv oder negativ sein.Even with the presence of only two rolls, the method is advantageous. Thus, in gravure printing machines, for example, the color decrease of the gravure cylinder - so the printing plate cylinder - are measured. The impression roller or general impression cylinder is in this case involved in the printing process, but does not participate in the color transport to the substrate or in the printing nip.
Thus, the process has its advantages in two rolls as well as in a color transport over several cylinders and a measurement of the ink film on one of the front rollers. As mentioned, the covering of the surface of the roller with color also changes in the last-mentioned case, when the rollers in the color transporting direction are turned against the following roller or the printing material and ink is actually transported onto the printing material.
As already mentioned, it is advantageous to observe the color film of an anilox roller used, for example, in flexographic printing. This will lose color especially when more cylinders are employed.
But also smooth rolls are used in various printing processes for coloring other rollers involved in the printing process.
It should be added at this point that the terms roller and cylinder in this document are used interchangeably or equivalently.
When determining the optimized relative position of the at least two rollers, the question is how strong the change of the area coverage on the roller must be in order for the control device to have first indications for an optimized roller distance and to end the measuring run. In this context, "measuring travel" is understood to mean the phase of the approach of the rollers, in which measured values are obtained which are used to determine a first optimized relative position.
One possibility is to end the measuring run as soon as a change in the color film on the roller being measured appears. Of course, the amount of paint being transferred at this time is of the sensitivity of the measuring system. In general, however, should be found in this way a Anstellsituation known to the printer as a "Kissprint". Here is a first light touch between the rollers.
At this point, for example, the further measurement of the color transfer can be terminated. However, a further approach can be carried out - if necessary - by the control device. Thus, an adjustment of the cylinders relative to each other by an empirically or computationally determined offset value - ie a further approximation of the cylinders by a distance amount - after reaching this "kiss-print point" or here a first optimized relative position - be brought about by the control device. In this way, then an optimized working distance between the cylinders in question, which is just not usually given when reaching a KissPrintpunktes, can be achieved.
An essential alternative to this procedure is to continue the approach of the cylinder with simultaneous evaluation - "the measurement run" - until a primary threshold or tolerance value - in this case the color decrease - is reached. This primary threshold value can be chosen so that when the primary threshold value is exceeded, the optimized working distance between the cylinders has already been reached, so that no further measures are required in this regard. Accordingly, the adjustment of the relative position of the rollers would be terminated at the end of the measuring run and the optimized working distance would coincide with the first optimized relative position. However, this can also be achieved. Threshold for the color decrease on the cylinder on which is measured, a further approximation of the cylinder by an amount of distance ("offset value") are additionally brought about.
Another way to determine an optimized Druckbeistellsituation is to follow the course of color reduction as a function of relative roll position. Then, if a characteristic course of this function occurs, it is possible, based on experience and calculations, to assume that the optimized relative pressure position of the cylinders has been reached. Thus, the achievement of the optimized printing position of the cylinder is often early on, since the color transfer after Reaching this position barely increases, but on further approach of the rollers enters a saturation region. Due to these facts, the function in question often has inflection points or relative maxima in the area of the optimized printing position. Characteristic points of this kind can be used by the control device to determine the optimized printing position. Often, an optimized relative print position is a "secondary threshold" (ie, a further amount of color decrease) or an "offset value" (ie, a certain amount of travel) away from such a characteristic point. If the course of the function is recorded far enough to calculate the position of such points, the test drive can also be ended here.
Process steps such as recording the function change of the color film / relative roller position, ending the test drive, finding one or more characteristic points of this function, switching on a threshold value and / or offset value can be carried out computer-implemented by the control device. Of course, this also applies to the other methods presented in this document.
From the above, it can be seen that the offset values and the secondary threshold values can be used in connection with all presented methods which determine the duration of the measuring run. The sign of the offset values ("more or less provision") or the secondary threshold values (more or less color transfer) can be positive or negative.
Es ist von Vorteil, den Bereich des Zylinders bzw. der Walze, an der die Messungen vorgenommen werden, auf den Bereich zu begrenzen, in dem Farbe abgenommen werden kann. In der Regel wird sich daher der maximale Messbereich der Sensorvorrichtung an dem maximalen Druckbereich orientieren (oft gleich oder etwas größer sein). Eine Möglichkeit, dies zu realisieren, besteht in der Verwendung einer Zeilenkamera, die die maximale Druckbreite abbilden kann. Diese Kamera wird in einer Arbeitsposition, in der sie den Druckbereich der Maschine überstreichen kann, zu dem betreffenden Zylinder aufgehängt. Es ist sinnvoll, den gesamten Messbereich des Sensorsystems in Teilbereiche zu zerlegen. Bereits das Sensorsystem selber kann modular zusammengesetzt sein - z. B. aus Fotodioden. In diesem Fall werden die Module des Sensorsystems bereits Teilbilder des gesamten Messbereichs liefern, der dann nicht mehr von einer Recheneinheit in Teilbereiche zerlegt zu werden braucht.
Neben der Zerlegung der gesamten möglichen Kontaktfläche zwischen zwei Zylindern in verschiedene Teilbereiche kommt jedoch auch das Messen der Änderung des Farbfilms in einer Untermenge von Teilbereichen in Frage. So kann unter gewissen Bedingungen eine Messung in einem quadratzentimetergroßen Teilbereich ausreichen. Mit neueren Sensoren sind auch Teilbereiche mit einer Fläche im Quadratmillimeterbereich vorstellbar. Da Druckwalzen an ihren beiden stirnseitigen Enden gelagert werden, ist es jedoch von Vorteil, im Bereich jeweils einer jeden der beiden Stirnseiten Messungen durchzuführen, um für jede der beiden Seiten Messwerte zu bekommen. Insbesondere in Bereichen der Drucktechnik, in denen große Toleranzen bei Druckformen und Walzen zu berücksichtigen sind - wie im Verpackungsdruck - sind mehrere Messungen von Vorteil.
Werden Messungen in mehreren Teilbereichen durchgeführt, so wird man vorteilhafterweise die vorstehend skizzierten Verfahren zur Ermittlung der optimierten relativen Druckposition der beteiligten Zylinder in den Teilbereichen anwenden. Die optimierte Anstellsituation dürfte vorteilhafterweise dann als erreicht gelten, wenn in einer Teilmenge der Teilbereiche die Bedingungen des jeweiligen Verfahrens erreicht sind.
Als Sensorvorrichtungen kommen wie erwähnt optische Sensoren wie Kameras in Frage. Der Begriff "optische Sensoren und Kameras" wird in diesem Zusammenhang auch dann verwendet, wenn nicht sichtbare elektromagnetische Strahlung aufgezeichnet werden kann.
Wird elektromagnetische Strahlung gemessen, so ist die spektrale Lichtintensität eine vorteilhafte Messgröße (Lichtintensität pro Spektralbereich pro Fläche). In diesem Fall ist es von Vorteil, eine spezielle Strahlungsquelle vorzusehen, die geeignete Strahlung auf die Walze einstrahlt. Die Sensoren messen dann die remittierte Strahlung. Bei der Anbringung von Strahlungsquelle und Sensor sind in der Regel die Reflexionsgesetze zu beachten (was unter anderem in den Figuren gezeigt ist).It is advantageous to limit the area of the cylinder or roller on which the measurements are made to the area in which ink can be taken off. In general, therefore, the maximum measuring range of the sensor device will be based on the maximum pressure range (often equal to or slightly larger). One way to realize this is to use a line scan camera that can map the maximum print width. This camera is suspended in a working position in which it can cover the printing area of the machine to the cylinder in question. It makes sense to divide the entire measuring range of the sensor system into subareas. Already the sensor system itself can be modular - z. B. from photodiodes. In this case, the modules of the sensor system will already provide partial images of the entire measuring range, which then no longer needs to be decomposed by a computer unit into subareas.
In addition to the decomposition of the entire possible contact area between two cylinders in different subregions, however, also the measurement of the change of the color film in a subset of subregions comes into question. Thus, under certain conditions, a measurement in a square centimeter-sized partial area may suffice. With newer sensors, subareas with an area in the square millimeter range are conceivable. Since pressure rollers are mounted at their two front ends, however, it is advantageous to carry out measurements in the region of each of the two end faces in order to obtain measured values for each of the two sides. Especially in areas of printing technology, where large tolerances for printing plates and rolls have to be considered - as in packaging printing - several measurements are advantageous.
If measurements are carried out in several subregions, it will be advantageous to use the methods outlined above for determining the optimized relative printing position of the cylinders involved in the subregions. The optimized Anstellsituation should advantageously be considered achieved when the conditions of the respective method are achieved in a subset of the sub-areas.
As sensor devices come as mentioned optical sensors such as cameras in question. The term "optical sensors and cameras" is used in this context, even if non-visible electromagnetic radiation can be recorded.
If electromagnetic radiation is measured, the spectral light intensity is an advantageous measured variable (light intensity per spectral range per area). In this case, it is advantageous to provide a special radiation source which radiates suitable radiation onto the roller. The sensors then measure the remitted radiation. When mounting the radiation source and sensor, the laws of reflection are generally to be observed (which is shown inter alia in the figures).
Eine Vorrichtung zum Ermitteln eines optimierten Arbeitsabstandes zwischen zwei am Druckprozess beteiligten Zylindern kann ein Druckwerk besonderer Ausstattung sein oder sie kann ein aus Sicht der Druckmaschine externes Reck mit entsprechenden zusätzlichen Merkmalen sein. Diesen Vorrichtungen ist gemein, dass Aufnahmen, in welchen die Druckzylinder drehbar gelagert und gegeneinander anstellbar sind, vorhanden sind. In einem externen Reck kann darüber hinaus die Vorbereitung des Druckplattenzylinders auf den Druck, sprich seine Ausrüstung mit der Druckplatte, vorgenommen werden. Zu diesem Zweck kann ein solches Reck zusätzlich mit Vorrichtungsmerkmalen ausgestattet sein, den so genannten Mountern, die typischerweise zur Rüstung von Flexodruckformatzylindern benutzt werden, eigen sind. Eine solche Vorrichtung wird beispielsweise in der
Wird die Erfindung in einer externen Einheit verwirklicht, so ist es noch nicht einmal nötig, den am Ende für optimal gehaltenen relativen Abstand zwischen den beteiligten Zylindern in der externen Einheit auch tatsächlich einzustellen. Vielmehr ist es dann erforderlich, die ermittelten Daten an die tatsächliche Druckmaschine weiterzugeben, die diese Werte dann auch einstellt. Für diese Informationsweitergabe kommen alle bekannten Kommunikationsmöglichkeiten zwischen den Vorrichtungen sowie eine Speicherung in den betreffenden Zylindern (z. B. RFID mit Auslesemöglichkeit in der Druckmaschine) in Frage. Zu den Vorrichtungsbestandteilen, die in einem Farbwerk regelmäßig vorkommen, die jedoch in einem externen Reck in der Regel fehlen, gehört eine Einfärbevorrichtung. Für die Zwecke eines externen Recks kann eine solche Einfärbevorrichtung rudimentär ausgestaltet sein. Sie kann auch mit einer speziellen Testfarbe beaufschlagt sein. Eine solche Textfarbe kann ähnliche Farbspaltungseigenschaften aber andere optische Eigenschaften ("leichter zu messen") als die eigentliche Farbe haben.
Insbesondere bei der Verwendung von weitgehend dielektrischen Farben kann die Güte des Farbfilms auf einer Walze - im Reck oder im Farbwerk - auch durch kapazitive Sensoren ermittelt werden. In diesem Fall ist leicht zu erkennen, dass die Dicke des Farbfilms auf der Oberfläche der Walze, an der gemessen wird, Einfluss auf die kapazitive Messung hat. Jedoch dürfte auch eine unebene Struktur eines Farbfilms hier eine Rolle spielen.
Bei einem erfindungsgemäßen Farbwerk kann die Entwicklung des Farbfilms auf der Walze auch während des Druckbetriebs beobachtet werden. Auf diese Weise können gegenüber dem Druckbetrieb dynamische Änderungen der Druckbedingungen erkannt werden. Es kann auf diese Änderungen im laufenden Druckbetrieb reagiert werden (z. B. durch andere Anstellung der Walzen oder durch Änderung der Viskosität der Druckfarbe).
An dieser Stelle ist noch einmal hervorzuheben, dass die Veränderung des Farbfilms auf dem zumindest einen farbtransportierendem Zylinder bei sich drehender Walze vorgenommen werden kann. Die Messung kann stattfinden, während die Zylinder - beziehungsweise die Zylinder deren Relativposition optimiert wird - in der Umgebung ihres Kissprintpunkts gegeneinander angestellt sind und ggf. während eine Messfahrt zur Auffindung einer optimierten Druckposition stattfindet. Ein Abfahren der Walzen voneinander, um die Messung durchzuführen, ist in der Regel nicht nötig.
In der nachfolgenden gegenständlichen Beschreibung werden Sensoren gezeigt, die in einer Arbeits- oder Messposition zu einer farbtransportierenden Walze angebracht sind. Bei optischen Sensoren - Kameras - sind oft auch noch Strahlungsquellen vorgesehen. Es hat sich gezeigt, dass sich durch Messungen auf den farbtransportierenden Walzen, die mit den gezeigten Sensoren möglich sind, auch noch andere für den Druckprozess relevante Größen oder Phänomene messen oder feststellen lassen. Diese werden nachfolgend in Bezug auf die Beobachtung einer Flexodruck-Rasterwalze erläutert:A device for determining an optimized working distance between two cylinders involved in the printing process may be a printing unit of special equipment or it may be an external drawing from the perspective of the printing press with corresponding additional features. These devices have in common that recordings in which the printing cylinder are rotatably mounted and against each other are available, are present. In addition, the preparation of the printing plate cylinder on the printing, in other words its equipment with the printing plate, can be carried out in an external stretching unit. For this purpose, such a bar may additionally be provided with device features inherent to so-called stands, which are typically used for the armor of flexographic printing format cylinders. Such a device is used for example in the
If the invention is realized in an external unit, then it is not even necessary to actually set the finally held for optimal relative distance between the cylinders involved in the external unit. Rather, it is then necessary to pass on the determined data to the actual printing press, which then also sets these values. For this information transfer, all known communication possibilities between the devices as well as storage in the relevant cylinders (eg RFID with possibility of reading out in the printing press) come into question. The device components which are regular in an inking unit, but which are usually absent in an external tray, include a coloring device. For the purposes of an external stage, such a coloring device may be rudimentary. It can also be loaded with a special test color. Such a text color may be similar Color split properties but have different optical properties ("easier to measure") than the actual color.
In particular, when using largely dielectric inks, the quality of the color film on a roller - in the drawing unit or in the inking unit - can also be determined by capacitive sensors. In this case, it is easy to see that the thickness of the ink film on the surface of the measured roll influences the capacitive measurement. However, an uneven structure of a color film should also play a role here.
In an inking unit according to the invention, the development of the ink film on the roller can also be observed during the printing operation. In this way, dynamic changes in the pressure conditions can be detected with respect to the printing operation. It can be responded to these changes in the current printing operation (eg by other adjustment of the rollers or by changing the viscosity of the ink).
At this point it should be emphasized once again that the change in the color film on the at least one color-transporting cylinder can be carried out with the roller rotating. The measurement can take place while the cylinders - or the cylinders whose relative position is being optimized - are set against each other in the vicinity of their kissprint point and, if necessary, during a measuring run to find an optimized printing position. Moving the rollers apart to perform the measurement is usually unnecessary.
In the following objective description sensors are shown, which are mounted in a working or measuring position to a color-transporting roller. With optical sensors - cameras - radiation sources are often provided. It has been shown that measurements on the ink-transporting rolls, which are possible with the sensors shown, also allow other variables or phenomena relevant to the printing process to be measured or determined. These are explained below in relation to the observation of a flexographic printing plate roller:
Es hat sich überraschenderweise gezeigt, dass sich auf der Rasterwalze ein mit geeigneten Sensoren gut erkennbares Negativbild des Druckmotives abzeichnet. Dieses kann mit dem aus der Druckvorstufe oft bekannten Sollbild des Druckbildes verglichen werden, das oft in elektronischer Form (z. B. pdf) vorliegt. Auf diese Weise können Fehler erkannt werden, bevor diese - ebenfalls unter Anfall von Makulatur auftreten.It has surprisingly been found that a negative image of the print motif which can be easily recognized by suitable sensors is displayed on the anilox roller. This can be compared with the target image of the print image, which is often known from pre-press, which is often available in electronic form (eg pdf). In this way, errors can be detected before they - also occur under waste accumulation.
Die Güte der Einfärbung der Rasterwalze - welche in der Regel durch eine Rakelkammer vorgenommen wird - kann vor oder während des Druckprozesses überwacht werden. Dies ist sehr wichtig, da es noch immer vorkommt, dass wenig oder gar keine Farbe auf der Walze ist, was natürlich das Druckbild negativ beeinflusst. Trockenlaufende Walzen aller Art können jedoch auch in Druckmaschinen Entzündungen und Explosionen hervorrufen, so dass die Erkennung der trockenen Walze zum "Explosionsschutz" verwendet werden kann (z. B. Druckabbruch oder Warnsignal).The quality of the coloring of the anilox roller - which is usually carried out by a doctoring chamber - can be monitored before or during the printing process. This is very important because it still happens that there is little or no color on the roller, which of course negatively affects the printed image. However, dry-running rolls of all kinds can also cause inflammations and explosions in printing presses, so that the recognition of the dry roll can be used for "explosion protection" (eg pressure drop or warning signal).
Farbablagerungen, die zu sogenanntem Ghosting führen können, oder Rakelstreifen, die durch ein zu stark angestelltes und/oder vibrierendes Rakelmesser auf der Oberfläche der Rasterwalze zustande kommen können, können mit den Sensoren erkannt werden. Als Abhilfe gegen das Ghosting kann man die Rasterwalze reinigen. Während des Druckbetriebes kann man mehr Lösemittel zuführen. Bei den Rakelstreifen bietet sich als Gegenmaßnahme eine Justage des Rakelmessers an. Streifen auf der Rasterwalze können auch durch Schwingungen in dem Farbwerk zustande kommen. Solche Schwingungen führen oft zu sehr regelmäßigen Dickeschwankungen des Farbfilms auf der Walze.Paint deposits, which can lead to so-called ghosting, or squeegee strips, which can come about by an over-hired and / or vibrating doctor blade on the surface of the anilox roller can be detected with the sensors. As a remedy against the ghosting you can clean the anilox roller. During printing you can add more solvent. As a countermeasure, the doctor blade offers an adjustment of the doctor blade. Strips on the anilox roller can also be caused by vibrations in the inking unit. Such vibrations often lead to very regular thickness variations of the ink film on the roller.
Bereits oben wurde erwähnt, dass Änderungen des Farbfilms auf einer farbtransportierenden Walze auch während des Druckbetriebs gemessen werden können. Bei solchen Änderungen kann dann wieder aufgrund der Messungen des Sensorsystems eine Optimierung der Walzenposition erfolgen. Maßnahmen dieser Art sind vorteilhaft, da sich aufgrund dynamischer Änderungen im Druckbetrieb eben Änderungen der Parameter einstellen. Daher wird in der Regel bei steigender Druckgeschwindigkeit weiter zugestellt.It has already been mentioned above that changes of the ink film on a ink-transporting roller can also be measured during the printing operation. With such changes can then again due to the Measurements of the sensor system to optimize the roll position. Measures of this type are advantageous because just change the parameters due to dynamic changes in the printing operation. Therefore, as a rule, delivery continues as the printing speed increases.
Anhand signifikanter Punkte in dem oben erwähnten Negativbild des Druckbildes auf der Rasterwalze oder anhand eigens zu diesem Zweck vorgesehener Registermarken, die ebenfalls in dem Negativbild abgebildet werden, kann auch eine Registerung oder Vorregisterung des druckbildtragenden Zylinders - beim Flexodruck des Formatzylinders - zu dem druckbildtragenden Zylinder zumindest eines weiteren Farbwerkes vorgenommen werden. Hierzu wird der signifikante Punkt oder die Marke auf der Oberfläche der Rasterwalze zu einem Zeitpunkt erkannt und die Winkelposition der Rasterwalze zu diesem Zeitpunkt z. B. mit einem Drehgeber aufgezeichnet. Ein signifikanter Punkt oder eine Marke auf der Oberfläche der Rasterwalze des weiteren Farbwerkes muss dann in eine geeignete relative Winkelposition gebracht werden. Dieser Umstand würde ebenfalls mit einem optischen Sensor und einem Drehgeber überprüft. Dieses Verfahren würde zum Beispiel ein makulaturfreies Vorregistern ermöglichen.On the basis of significant points in the above-mentioned negative image of the printed image on the anilox roller or using specially provided for this purpose register marks, which are also imaged in the negative image, can also register or Vorregisterung the print image-carrying cylinder - in flexographic printing of the format cylinder - to the print image-carrying cylinder at least be made of another inking unit. For this purpose, the significant point or the mark on the surface of the anilox roller is detected at a time and the angular position of the anilox roller at this time z. B. recorded with a rotary encoder. A significant point or mark on the surface of the anilox roll of the further inking unit must then be brought into a suitable relative angular position. This circumstance would also be checked with an optical sensor and a rotary encoder. This method would, for example, enable a scratch-free pre-register.
Die vorstehenden Verfahren sind mit den Verfahren zur Einstellung der Relativposition der zumindest zwei am Druckprozess beteiligten Walzen vorteilhaft kombinierbar. Beide Typen von Verfahren haben überraschende Vorteile, wenn sie anhand von Messungen an Zylindern mit unebenen Oberflächen - wie Rasterwalzen, Formatzylindern oder Formzylindern - durchgeführt werden.
Bei Glattwalzen ergeben sich in der Regel geringere Signal-Rauschverhältnisse.The above methods can be advantageously combined with the methods for adjusting the relative position of the at least two rollers involved in the printing process. Both types of methods have surprising advantages when performed by measurements on cylinders having uneven surfaces, such as anilox rolls, form cylinders, or form cylinders.
Smooth rollers generally result in lower signal-to-noise ratios.
Weitere Ausführungsbeispiele der Erfindung gehen aus der gegenständlichen Beschreibung und den Ansprüchen hervor.Further embodiments of the invention will become apparent from the description and the claims.
Die einzelnen Figuren zeigen:
- Fig. 1
- Eine Funktionsskizze einer ersten Zentralzylinderflexodruckmaschine
- Fig. 2
- Eine Funktionsskizze einer zweiten Zentralzylinderflexodruckmaschine
- Fig. 3
- Eine Funktionsskizze einer dritten Zentralzylinderflexodruckmaschine
- Fig. 4
- Eine schematische Schnittdarstellung des Farbwerks 5 der dritten Zentralzylinderflexodruckmaschine
- Fig. 5
- Eine Funktionsskizze einer vierten Zentralzylinderflexodruckmaschine
- Fig. 6
- Einen ersten
Ausschnitt aus Figur 8 - Fig. 7
- Einen zweiten
Ausschnitt aus Figur 8 - Fig. 8
- Eine Skizze einer Rasterwalze und eines Sensorsystems
- Fig. 9
- Eine zweite Ansicht des Sensorsystems aus
Figur 8 - Fig. 10
- Eine Veranschaulichung eines ersten Messverfahrens
- Fig. 11
- Eine Veranschaulichung eines zweiten Messverfahrens
- Fig. 12
- Eine Veranschaulichung einiger Begriffe
- Fig. 13
- Eine Veranschaulichung eines dritten Messverfahrens
- Fig. 14
- Eine Veranschaulichung eines vierten Messverfahrens
- Fig. 15
- Eine Rasterwalze und eine Kamera
- Fig. 16
- Eine weitere Rasterwalze und eine Kamera
- Fig. 17
- Eine Vergrößerung der Oberfläche einer Rasterwalze 7 in der Schnittdarstellung
- Fig. 18
- Die
Schnittdarstellung aus Figur 17 mit leeren Näpfchen 30 - Fig. 19
- Eine weitere Vergrößerung der Oberfläche einer Rasterwalze 7 in der Schnittdarstellung
- Fig. 20
- Die
Schnittdarstellung aus Figur 19 mit leeren Näpfchen 30 - Fig. 21
- Eine
Skizze einer Rasterwalze 7, die von einer beweglichen Kamera abgetastet wird - Fig. 22
- Die
Skizze aus Figur 21 , wobei ein Formatzylinder an die Rasterwalze angestellt ist - Fig. 23
- Der Verlauf der Intensität von der Rasterwalze remittieren Lichts als Funktion des Walzendrehwinkels ϕ
- Fig. 1
- A functional sketch of a first central cylinder flexographic printing press
- Fig. 2
- A functional sketch of a second central cylinder flexographic printing press
- Fig. 3
- A functional sketch of a third central cylinder flexographic printing press
- Fig. 4
- A schematic sectional view of the
inking unit 5 of the third Zentralzylinderflexodruckmaschine - Fig. 5
- A functional sketch of a fourth central cylinder flexographic printing press
- Fig. 6
- A first excerpt
FIG. 8 - Fig. 7
- A second cutout
FIG. 8 - Fig. 8
- A sketch of an anilox roller and a sensor system
- Fig. 9
- A second view of the sensor system
FIG. 8 - Fig. 10
- An illustration of a first measuring method
- Fig. 11
- An illustration of a second measurement method
- Fig. 12
- An illustration of some terms
- Fig. 13
- An illustration of a third measurement method
- Fig. 14
- An illustration of a fourth measurement method
- Fig. 15
- An anilox roller and a camera
- Fig. 16
- Another anilox roller and a camera
- Fig. 17
- An enlargement of the surface of an
anilox roller 7 in the sectional view - Fig. 18
- The sectional view from
FIG. 17 withempty cups 30 - Fig. 19
- A further enlargement of the surface of an
anilox roller 7 in the sectional view - Fig. 20
- The sectional view from
FIG. 19 withempty cups 30 - Fig. 21
- A sketch of an
anilox roller 7, which is scanned by a mobile camera - Fig. 22
- The sketch off
FIG. 21 , wherein a format cylinder is employed to the anilox roller - Fig. 23
- The course of the intensity of the anilox roller remit light as a function of the roller rotation angle φ
Hier überträgt die Rakelkammer 6 Farbe auf die Oberfläche der Rasterwalze 7. Diese 7 transportiert die Farbe durch ihre Drehung weiter zu dem Formatzylinder 8. Der Formatzylinder 8 trägt das erhabene Klischee 11, das Farbe von der Oberfläche der Rasterwalze 7 abnimmt. Auf der Oberfläche der Rasterwalze 7 bildet sich daher in dem Berührungsbereich 10 zwischen dem Klischee 11 des Formatzylinders 8 und der Rasterwalze 7 eine Zone aus, in der Farbverlust eintritt. Diesen Farbverlust gilt es bei einer Druckmaschine 15, wie sie in
Das Klischee 11 überträgt die Farbe auf den Bedruckstoff 9, der auf der Umfangsfläche des Gegendruckzylinders 1 transportiert wird. Im unteren Bereich der
In der Regel wird die Zeilenkamera 17 bereits mit eigenen Strahlungsquellen, die Strahlung auf den Berührungsbereich 10 einstrahlen, ausgestattet sein.
Ein solcher Aufbau ist auch in der Schnittdarstellung des Farbwerks 5 in
Here, the
The
As a rule, the
Such a structure is also in the sectional view of the
Anhand von
- Hierbei wird der Arbeitsabstand zwischen einer ersten Gruppe von am
1,7,8 eingestellt, wobei die erste Gruppe eine erste Anzahl N von Zylindern aufweist und die erste Anzahl zumindest drei beträgt,Druckprozess beteiligten Zylindern
wobei der Arbeitsabstand zwischen einer zweiten Gruppe von am 7,8 aufgrund von Messwerten eingestellt wird, die die Veränderung des Farbfilms auf zumindest einem der zwei Zylinder betreffen, wobei die zweite Gruppe eine Teilmenge der ersten Gruppe ist, die zweite Gruppe eine zweite Anzahl M von Zylindern aufweist und die zweite Anzahl M zumindest zwei beträgt,Druckprozess beteiligten Zylindern
und wobei der Arbeitsabstand zwischen einer dritten Gruppe von am 1,8 aufgrund von Messwerten eingestellt wird, die auf andere Weise gewonnen werden als die Messwerte für die Einstellung des Arbeitsabstandes zwischen den Zylindern der zweiten Gruppe von am Druckprozess beteiligten Zylindern, wobei die dritte Gruppe eine Teilmenge der ersten Gruppe ist, die dritte Gruppe eine dritte Anzahl O von Zylindern aufweist und die dritte Anzahl O zumindest zwei beträgt.Druckprozess beteiligten Zylindern
- Here, the working distance is set between a first group of cylinders involved in the
1,7,8, wherein the first group has a first number N of cylinders and the first number is at least three,printing process
wherein the working distance between a second group of 7, 8 involved in the printing process is set on the basis of measured values concerning the change of the color film on at least one of the two cylinders, the second group being a subset of the first group, the second group being a second group Number M of cylinders and the second number M is at least two,cylinders
and wherein the working distance between a third group of 1, 8 involved in the printing process is set on the basis of measured values obtained in a different way than the measured values for the adjustment of the working distance between the cylinders of the second group of cylinders involved in the printing process; third group is a subset of the first group, the third group has a third number O of cylinders and the third number O is at least two.cylinders
In dem in
Die dritte Gruppe kann dann aus dem Gegendruckzylinder 9 und dem Formatzylinder 8 gebildet werden. Bei diesen beiden Zylindern kann die Einstellung der optimierten Druckposition in einer anderen Art und Weise erfolgen, um Makulatur zu sparen.
Ein solches anderes Verfahren zur Einstellung einer optimierten Druckposition ist in der noch unveröffentlichten deutschen Patentanmeldung mit der Anmeldenummer
The third group can then be formed from the
Such another method for setting an optimized printing position is in the still unpublished German patent application with the
Bei der Lehre der deutschen Patentanmeldung mit der Anmeldenummer
Die Lehre der deutschen Patentanmeldung mit der Anmeldenummer
Die in
Es hat sich gezeigt, dass auch solche Kameras bei bestimmten Anwendungsfällen völlig ausreichend sind. Als Kameras mit kleinem Gesichtsfeld (Größenordnung Quadratmillimeterbereich) kommen Sensoren, wie Reflexionssensoren beziehungsweise Lichttaster, die bereits in Reihendruckmaschinen als Registersensoren Verwendung finden, in Frage. Diese Sensoren verfügen über Lichtleiter (in der Regel glasfaserbasiert), die sowohl Licht auf den Beobachtungsbereich leiten als auch das von der Walzenoberfläche remittierte Licht, das der Messung dient, ableiten (in der Regel nachdem es von einer Linse oder Ähnlichem gesammelt wurde). Dank der Lichtleiter befinden sich sowohl die Strahlungsquelle als auch die Analyseeinheit in ungefährdeter Einbaulage in einem Abstand von der Messstelle. Die genannten Sensoren sind als hochintegrierte (u. a. mechanisch belastbare und gegen chemische Einflüsse relativ unempfindliche Bauteile zu erwerben). Es ist dank der Lichtleiter auch möglich, die Positionen der lichtemittierenden und immittierenden Bauteile (Sender und Empfänger) sowie der Walzenoberfläche so einzustellen, dass ein Großteil des remittierten Lichtes in den Empfänger zurückfällt und der Messung zugeführt wird (in der Regel mit Fotodioden). Die Erzeugung des Lichtes wird in der Regel mit LEDs durchgeführt. Oft wird hierbei Licht erzeugt, das in seiner Farbe auf die Farbe der untersuchten Walze abgestimmt ist. Diese Maßnahme ist bei allen Strahlungsquellen in Zusammenhang mit der hier vorgestellten Lehre hilfreich. Die
Bereits in den bisherigen Figuren wurde auf die Darstellung eines externen Recks verzichtet, da es dieselben mechanischen Funktionskomponenten aufweisen muss wie die skizzierten Farbwerke beziehungsweise Druckmaschinen. Es wurde auch auf die Darstellung von Steuereinheiten, Leitungen und Schnittstellen verzichtet. Trotzdem wird ausdrücklich darauf verwiesen, dass die geschilderten Verfahren computerimplementiert durchgeführt werden können. Oft werden die Steuereinheit der Druckmaschine und/oder die Steuereinheit eines externen Recks mit den entsprechenden Soft- und Hardwarekomponenten ausgestattet sein. Bei Vorhandensein eines externen Recks kann die Arbeit auch zwischen den betreffenden Steuereinheiten des Recks und der Druckmaschine geteilt werden.
In den
Durch die
Das in
Das Erreichen des optimierten Arbeitsabstands 38 kann durch Messungen verifiziert werden, was oft aber nicht nötig sein dürfte.
Auch in
In
In the
It has been shown that even such cameras are completely sufficient in certain applications. As cameras with a small field of view (on the order of a square millimeter area), sensors such as reflection sensors or light scanners, which are already being used as register sensors in series printing machines, come into question. These sensors have optical fibers (typically glass fiber based) that both direct light to the viewing area and derive the light returned from the roll surface (usually after being collected by a lens or the like) for measurement. Thanks to the light guides, both the radiation source and the analysis unit are in a roughly installed position at a distance from the measuring point. The mentioned sensors are to be acquired as highly integrated (among others mechanically loadable and relatively insensitive to chemical influences) components. Thanks to the light guides, it is also possible to adjust the positions of the light emitting and emitting components (transmitter and receiver) and the roller surface so that a large part of the remitted light falls back into the receiver and is fed to the measurement (usually with photodiodes). The generation of light is usually carried out with LEDs. Often this produces light which is matched in its color to the color of the roller being examined. This measure is helpful for all radiation sources in connection with the teaching presented here. The
Already in the previous figures has been dispensed with the representation of an external deck, since it must have the same mechanical function components as the sketched inking or printing machines. It has also been dispensed with the representation of control units, lines and interfaces. Nevertheless, it is expressly pointed out that the described methods can be carried out computer-implemented. Often the control unit of the printing press and / or the control unit of an external deck to be equipped with the corresponding software and hardware components. In the presence of an external deck, the work can also be shared between the respective control units of the deck and the printing press.
In the
By the
This in
Achieving the optimized working
Also in
In
In den
- Wie bereits in
den Figuren 10 und 11 gezeigt, befindet sich die Lichtintensität zunächst auf einemMaximum 42. Nach dem Verlassen dieses Maximums (diesbeginnt im Punkt 31, wie bereits gezeigt) nimmt derGraph 45 oft einen sehr charakteristischen Verlauf 46 an, biser sein Minimum 43 erreicht. Innerhalb dieses Bereiches lassen sich charakteristische Punkte 44 ermitteln (wie Wendepunkte oder lokale Maxima), von denen sich Aussagen zu der Lage einer optimierten Arbeitsposition der beiden Walzen machen lassen. So ist in eine Situation dargestellt, in der die Messfahrt bis zum Erreichen einer optimierten Druckposition durchgeführt wird. BeiFigur 13Erreichen des Punktes 38 kann die Steuereinrichtung den weiteren Kurvenbereich berechnen oder abschätzen. Sie hält keine weitere Anstellung für nötig und beendet sowohl die Messfahrt als auch den Anstellvorgang. Oft wird es sogar möglich sein, bei diesem Verfahren (Optimierung der Relativen Walzenposition aufgrund der Auswertung des charakteristischen Verlaufs der Funktion 45) die Messfahrt sehr früh zu beenden und die optimierte Walzenposition durch einen Offset 34 zu erreichen.
In Bezug auf die
Die in den Figuren gezeigten Verläufe der Graphen 45 können sich in Teilbereichen der Fläche oder aber in der gesamten Fläche einstellen. Daher ist es möglich, mit den dargestellten Verfahren die Veränderung der Farbschicht in
- As already in the
FIGS. 10 and 11 The light intensity is initially at a maximum 42. After leaving this maximum (this begins atpoint 31, as already shown),graph 45 often assumes a verycharacteristic course 46 until it reaches its minimum 43. Within this range,characteristic points 44 can be determined (such as turning points or local maxima) from which statements can be made about the position of an optimized working position of the two rolls. So is inFIG. 13 a situation is shown in which the test drive is carried out until an optimized printing position is reached. When thepoint 38 is reached, the control device can calculate or estimate the further curve range. She considers no further employment necessary and terminates both the measuring drive and the setting process. Often it will even be possible, in this method (optimization of the relative roll position based on the evaluation of the characteristic curve of the function 45) to end the measuring run very early and to achieve the optimized roll position by means of an offset 34.
Regarding the
The curves of the
Während die Bildebene der
Auch die
Das von der Rasterwalze 7 remittierte Licht 50 wird in
Gerade angesichts der
Darüber hinaus kann eine solche erste Berührung zwischen den Walzen auch dazu führen, dass Farbe von der Oberfläche der Walze in Näpfchen 30, Zwischenräumen zwischen erhabenen Abschnitten des Druckbildes oder sonstige tiefer gelegenen Bereiche der Walzenoberfläche verdrängt wird, ohne dass eine Farbübertragung an einen anderen Zylinder - in aller Regel Farbspaltung genannt - stattfindet. Auch in dem zuletzt geschilderten Fall kann sich das Reflexionsverhalten der Walzenoberfläche signifikant verändern. So verschwindet die Farbe aus den höhergelegenen Bereichen der Walzenoberfläche, so dass diese nicht mehr von einer glatten Farbschicht abgedeckt sind. Die in der Regel unregelmäßigen erhabenen Elemente der Walzenoberfläche (bei Rasterwalzen oft Stege zwischen den Näpfchen 30, bei Formatzylindern 8 druckaktive Bereiche) verhindern eine einheitliche direkte Reflexion und tragen so zur Erzeugung diffuseren oder ungerichtet reflektierten Lichts bei der ausfallenden Strahlung 50 bei.
Neben der Farbabnahme und der Änderung der Oberflächenstruktur kann natürlich auch eine Farbzunahme in Folge eines Kontaktes zwischen am Druckprozess beteiligten Walzen gemessen werden. Dies kann zum Beispiel der Fall sein, wenn die Farbzunahme auf einem Formatzylinder 8, gegen den eine bereits eingefärbte Rasterwalze angestellt wird, gemessen wird. Für die qualitativen Veränderungen - beispielsweise der in Folge der Anstellung gemessenen Zulahme der Intensität I des remittierten Lichts 50 - gilt dann das in Bezug auf die
Mit den dargestellten Verfahren ist es daher u. a. möglich,
- einen ersten Kontakt zwischen Zylindern 1,7,8 zu erkennen,
- die Güte des Kontaktes zu erkennen,
27,28 desTeilbereiche Berührungsbereichs 10 zu untersuchen,- den gesamten Berührungsbereich in solche Teilbereiche zu zerlegen.
While the picture plane of the
Also the
The remitted from the
Especially in the face of
Moreover, such a first contact between the rollers may also cause ink to be displaced from the surface of the roller into
In addition to the color decrease and the change in the surface structure, of course, an increase in color as a result of contact between rollers involved in the printing process can be measured. This may be the case, for example, when the increase in color is measured on a
Among other things, it is therefore possible with the methods shown
- to detect a first contact between
1,7,8,cylinders - to recognize the goodness of the contact
- Examine
27, 28 ofsubregions touch region 10, - to break the entire contact area into such subregions.
Die Beobachtung kann bei sich drehenden Walzen erfolgen. Hierbei kann die Entstehung von Makulatur vermieden werden. Es kann die Vollständigkeit und/oder Gleichmäßigkeit des Farbübertrages untersucht werden. Es ist vorteilhaft, die erwähnten und nachfolgenden Verfahren mit Vorrichtungen durchzuführen, die zu ihrer Durchführung - beispielsweise durch die Programmierung einer Steuervorrichtung - eingerichtet sind.
Die Messung der Veränderung des Farbfilms kann gemessen werden, während die Walzen noch gegeneinander angestellt sind.
Die
In
Dieser Farbverlust in dem Berührungsbereich 10 führt zu einer signifikaten Änderung der Messwerte gegenüber der vor der Anstellung gemessenen Referenzkurve R, die durch die punktierte Tastmesskurve TM in
Es ist vorteilhaft, die weitere Anstellung der Zylinder 7, 8 zu beenden (optimierte Einstellung der relativen Walzenposition erreicht), wenn die Differenz zwischen den Tastmesswerten TM und den Referenzwerten R in einer Winkelposition ϕ der Walze (kann mit einem Drehgeber aufgezeichnet werden) einen bestimmten Wert (z. B. Toleranzwerte T1 oder T2 überschreitet). In einem solchen Fall greift die Kurve TM über die die gestrichelten Kurven G1 oder G2 hinaus aus. Auch der Verlauf der Differenz zwischen Referenzwerten R und Tastmesswerten TM kann der Einstellung der relativen Walzenpositionen zugrunde gelegt werden. Beispiel: Die Differenz TM-R - jeweils in einer bestimmten Winkelstellung ϕ1 wird nach ϕ abgeleitet.
Überschreitet die Ableitung einen bestimmten Ableitungsgrenzwert K ist die optimierte Walzenposition erreicht:
The measurement of the change in the color film can be measured while the rollers are still set against each other.
The
In
This loss of color in the
It is advantageous to stop the further adjustment of the
If the derivative exceeds a certain discharge limit K, the optimized roll position has been reached:
In
Oft ist es vorteilhaft, wenn die in den Figuren dargestellten Sensoren 17, 19, 24 nach dem Abtasten der Walze aus dem Bereich des Farbwerkes herausgeschwenkt werden. In diesem Fall werden die empfindlichen Sensoren im weiteren Druckbetrieb nicht mehr verschmutzt. In der abgeschwenkten Position kann eine Reinigung stattfinden, die zum Beispiel von einer eigens dafür vorgesehenen Reinigungsvorrichtung vorgenommen werden kann. In dieser Position kann auch ein Rekalibrieren des Sensors vorgenommen werden. Bei Farbwechseln in dem Farbwerk können die spektralen Empfindlichkeitsbereiche der Sensoren durch Filter und/oder durch Beaufschlagung der Halbleiterdioden mit einer anderen Gegenspannung verstellt werden.
Claims (25)
- Method for setting an optimized working spacing between at least two cylinders (1, 7, 8) of a printing unit (5), which printing unit (5) comprises at least two cylinders (1, 7, 8),- the said cylinders (1, 7, 8) transporting ink in an ink transport direction (23) during the printing process,- the spacing being set in the method between the at least two cylinders, of which a first cylinder (7) transfers ink during the printing process and a second cylinder (8) receives ink from the first cylinder (7) during the printing process,- the optimized working spacing between the at least two cylinders (1, 7, 8) being set on the basis of the measured values of a sensor apparatus (17, 24),- the sensor apparatus (17, 24) recording the change in the ink film, which change occurs on at least one cylinder (7, 8) which participates in the transport of ink (29) to the printing material (9),- and the change in the ink film (22) on the cylinder (7), which change is recorded by the sensor apparatus (17, 24), consisting in the decrease of the ink or in the change in the surface of the ink film as a consequence of a contact pressure,
characterized- in that the at least one cylinder (7, 8), on which the change in the ink film is recorded, is a cylinder which is positioned in the ink transport direction (23) in front of the second cylinder (8) which receives ink during the printing process,- and in that the change in the ink film (22) on the at least one cylinder (7, 8) is performed while the cylinders are rotating. - Method according to Claim 1, characterized in that the change of the ink film on the first cylinder (7) which transfers ink to the second ink-receiving cylinder is recorded.
- Method according to one of the preceding claims, characterized in that the change in the ink film on a cylinder (7) which is positioned in the ink transport direction (23) in front of the first cylinder (7) which transfers ink to the second ink-receiving cylinder (8) is recorded.
- Method according to one of the preceding claims, characterized in that the spacing between more than two cylinders (1, 7, 8) of a printing unit (5) is set on the basis of the recording of the ink film (22) on one cylinder (7).
- Method according to the preceding claim, characterized in that in each case two cylinders (1, 7, 8) are successively set against one another, and in that, during this setting-on operation, the change in the ink film (22) on the one cylinder (7) is recorded and is used as the basis for setting the spacing.
- Method according to one of the preceding claims, characterized in that that part of the surface of the at least one cylinder (7) which can transfer ink is first of all inked completely, before the setting operation of the at least two cylinders (7, 8) against one another is performed.
- Method according to one of the preceding claims, characterized in that the sensor apparatus records the change in the ink film (22) which occurs on a printing-plate cylinder (8) and/or a smooth or engraved roll (7).
- Method according to the preceding claim, characterized in that the spacing of at least three cylinders (1, 7, 8) which participate in the printing process is set, at least two cylinders (7, 8) of the at least three cylinders (1, 7, 8) participating in the transport of ink (29) to the printing material (9), and in that the sensor apparatus measures the change in the ink film which occurs at least on that one of the at least two cylinders (7, 8) participating in the ink transport which is further away from the printing material (9).
- Method according to the preceding claim, characterized in that all the cylinders (1, 7, 8) of an inking unit (5) which participate in the printing process are set against one another during the measurements.
- Method according to one of the preceding claims, characterized in that, in the context of a first measurement run (32), the sensor apparatus (17, 24) records the change in the ink film, while the spacing between cylinders (1, 7, 8) which participate in the printing process is changed, and in that a control apparatus ends the first measurement run (32) when a starting change in the ink film is to be assumed on the basis of the measured values or when the change in the ink film exceeds a primary threshold value (33).
- Method according to one of the preceding claims, characterized in that, in the context of a first measurement run (32), the sensor apparatus (17, 24) records the change in the ink film, while the spacing between cylinders (1, 7, 8) which participate in the printing process is changed, and in that a control apparatus ends the measurement run (32) when a defined characteristic profile of the measured values is set.
- Method according to either of the two preceding claims, characterized in that the relative position of the cylinders (1, 7, 8) which is set at the end of the first measurement run (32) is changed in order to set the optimized working spacing, by the relative position being changed by a certain distance (34), and/or by the relative position being changed until a change in the ink film by a certain amount (33) is set, which is tracked using renewed measurements.
- Method according to one of the preceding claims, characterized in that the sensor apparatus (17, 24) records the change in the ink film (22) which occurs in the contact region (10) of the surface of the at least one cylinder (7, 8) which makes contact with the following cylinder (1, 7, B) or printing material (9) in printing operation.
- Method according to one of the preceding claims, characterized in that the sensor apparatus (17, 24), divides the area (10), in which it records the change in the ink film, into part regions (27, 28) and/or records part regions (27, 28) of the said area (10).
- Method according to one of the preceding claims, characterized in that the sensor apparatus (17, 24) surveys the area (10), in which it records the change in the ink film (22), by recording the intensity (I) of the light which is remitted by the said area (10).
- Method according to one of the preceding claims, characterized in that the change in the ink film which is recorded by the sensor apparatus consists in an increase in ink and/or decrease in ink and/or a change in the surface of the ink film.
- Method according to one of the preceding claims, characterized in that the working spacing is set between a first group of cylinders (1, 7, 8) which participate in the printing process, the first group having a first number (N) of cylinders and the first number being at least three, the working spacing between a second group of cylinders (1, 7, 8) which participate in the printing process being set on the basis of measured values which relate to the change in the ink film on at least one of the two cylinders, the second group being a subset of the first group, the second group having a second number (M) of cylinders and the second number (M) being at least two, and the working spacing between a third group of cylinders (1, 7, 8) which participate in the printing process being set on the basis of measured values which are obtained in a different way than the measured values for the setting of the working spacing between the cylinders of the second group of cylinders which participate in the printing process, the third group being a subset of the first group, the third group having a third number (O) of cylinders and the third number (O) being at least two.
- Method according to one of the preceding claims, characterized in that the sensor apparatus (17, 24) first of all scans at least constituent parts of the area (10) of the cylinder, on which the change in the ink film is recorded, before the at least two cylinders are set against one another.
- Method according to the preceding claim, characterized in that the sensor apparatus (17, 24) first of all scans at least constituent parts of the area (10) of the cylinder (7), on which the change in the ink film is recorded, before the at least two cylinders (1, 7, 8) are set against one another and after at least constituent parts of the area (10) of the cylinder, on which the change in the ink film (22) is recorded, have been inked.
- Method according to either of the two preceding claims, characterized- in that the sensor apparatus (17, 24) first of all determines reference values (R), by scanning at least constituent parts of the area (10) of the cylinder (7), on which the change in the ink film (22) is recorded, as a function of the angular position (f) of the said cylinder (7) before the at least two cylinders (1, 7, 8) are set against one another,- in that the said reference values (R) are compared with sensing measured values (TM) which are obtained in an identical angular position (f) after or during the setting operation of the at least two cylinders (1, 7, 8) against one another,- and in that the optimized working spacing between the at least two cylinders (1, 7, 8) is set on the basis of this comparison.
- Method according to the preceding claim, characterized in that, during the setting of the optimized working spacing of the at least two cylinders (1, 7, 8), the difference between the reference values (R) and the sensing measured values (TM) which are recorded in each case in an angular position (f) of the cylinder (8), the surface of which is scanned, is taken into consideration.
- Method according to the preceding claim, characterized in that the profile of the difference between the reference values (R) and the sensing measured values (TM) as a function of the relative position of the at least two cylinders (1, 7, 8) is taken into consideration during the setting of the optimized working spacing of the at least two cylinders (7, 8), the differential values in in each case one angular position (f) of the cylinder (8), the surface of which is scanned, being used as the basis for the setting.
- Apparatus (5) for determining an optimized working spacing between at least two cylinders (1, 7, 8) of a printing unit (5) which participate in the printing process,- which apparatus (5) comprises seats, in which the cylinders (1, 7, 8) are mounted rotatably and can be set against one another,- which apparatus (5) comprises a control apparatus which is set in such a way that the optimized working spacing between the at least two cylinders (1, 7, 8) can be determined by way of the said control apparatus on the basis of the measured values of a sensor apparatus (17, 24),- and which apparatus (5) comprises an inking apparatus (6) which inks the first cylinder (7) in the direction (23) of the ink transport between the cylinders (7, 8) which are set against one another,- the sensor apparatus (17, 24) being attached to the first cylinder (7) in a working position and being capable of recording measured values which characterize the change in the ink film which appears on the first cylinder (7), characterized in that the measured values can be recorded by way of the sensor apparatus, while the cylinders are rotating.
- Apparatus according to the preceding claim, characterized by an optical sensor apparatus (17, 24).
- Apparatus according to the preceding claim, characterized by an illumination apparatus which is in a working position with respect to the first cylinder (7) and the sensor apparatus (17, 19, 24).
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP11717678.4A EP2566695B1 (en) | 2010-05-07 | 2011-05-09 | Method for setting and device for determining an optimal operating distance between at least two cylinders of a printing unit involved in the printing process |
EP14157875.7A EP2759407B1 (en) | 2010-05-07 | 2011-05-09 | Method for setting and device for determining an optimal operating distance between at least two cylinders involved in a printing process |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP10162344A EP2384892A1 (en) | 2010-05-07 | 2010-05-07 | Method for setting and device for determining an optimal operating distance between at least two cylinders of a printing unit involved in the printing process |
PCT/EP2011/057417 WO2011138466A1 (en) | 2010-05-07 | 2011-05-09 | Method and apparatus for determining and setting an optimized operating distance between at least two cylinders involved in a printing process |
EP11717678.4A EP2566695B1 (en) | 2010-05-07 | 2011-05-09 | Method for setting and device for determining an optimal operating distance between at least two cylinders of a printing unit involved in the printing process |
Related Child Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14157875.7A Division EP2759407B1 (en) | 2010-05-07 | 2011-05-09 | Method for setting and device for determining an optimal operating distance between at least two cylinders involved in a printing process |
EP14157875.7A Division-Into EP2759407B1 (en) | 2010-05-07 | 2011-05-09 | Method for setting and device for determining an optimal operating distance between at least two cylinders involved in a printing process |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2566695A1 EP2566695A1 (en) | 2013-03-13 |
EP2566695B1 true EP2566695B1 (en) | 2014-04-16 |
Family
ID=42797494
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10162344A Withdrawn EP2384892A1 (en) | 2010-05-07 | 2010-05-07 | Method for setting and device for determining an optimal operating distance between at least two cylinders of a printing unit involved in the printing process |
EP11717678.4A Active EP2566695B1 (en) | 2010-05-07 | 2011-05-09 | Method for setting and device for determining an optimal operating distance between at least two cylinders of a printing unit involved in the printing process |
EP14157875.7A Active EP2759407B1 (en) | 2010-05-07 | 2011-05-09 | Method for setting and device for determining an optimal operating distance between at least two cylinders involved in a printing process |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10162344A Withdrawn EP2384892A1 (en) | 2010-05-07 | 2010-05-07 | Method for setting and device for determining an optimal operating distance between at least two cylinders of a printing unit involved in the printing process |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP14157875.7A Active EP2759407B1 (en) | 2010-05-07 | 2011-05-09 | Method for setting and device for determining an optimal operating distance between at least two cylinders involved in a printing process |
Country Status (4)
Country | Link |
---|---|
US (2) | US20130291749A1 (en) |
EP (3) | EP2384892A1 (en) |
ES (2) | ES2478247T3 (en) |
WO (1) | WO2011138466A1 (en) |
Families Citing this family (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011086047A1 (en) * | 2011-11-09 | 2013-05-16 | Windmöller & Hölscher Kg | Method for adjusting the distances between cylinders of an inking unit and printing machine |
DE102012111651A1 (en) * | 2012-11-30 | 2014-06-05 | Bundesdruckerei Gmbh | Method and device for checking the completeness of an order from a transparent layer of a medium on a carrier material |
DE102014101433B4 (en) * | 2014-02-05 | 2016-03-24 | CONPRINTA GmbH & Co. KG | Printing unit for a flexographic printing machine and method for its operation |
US10814615B2 (en) | 2014-03-21 | 2020-10-27 | Bobst Firenze S.R.L. | Method and device for the control and the management of the printing parameters of a flexographic printing machine |
DE102015108126A1 (en) * | 2015-05-22 | 2016-11-24 | Windmöller & Hölscher Kg | Printing machine and method for employment of several inking units of a printing press |
ITUA20162391A1 (en) | 2016-04-07 | 2017-10-07 | Bobst Firenze S R L | MECHANICAL CYLINDER AND METHOD FOR CONTROL AND ADJUSTMENT OF PRINT PARAMETERS IN PRINTING MACHINES |
DK3439882T3 (en) | 2016-04-07 | 2020-03-23 | Bobst Firenze S R L | A DEVICE AND PROCEDURE FOR HEATING AN ANILOX BY INDUCTION IN PRINTING MACHINES |
EP3921163B1 (en) | 2019-02-05 | 2023-03-15 | Koenig & Bauer AG | Gravure printing units and methods for adjusting and/or modifying ink transfer in a gravure printing method |
DE102019111804A1 (en) * | 2019-05-07 | 2020-11-12 | Koenig & Bauer Ag | Method for setting and / or changing an ink transfer, printing unit and printing machine with a printing unit |
WO2020224815A1 (en) * | 2019-05-07 | 2020-11-12 | Koenig & Bauer Ag | Gravure printing system, substrate portion, method for controlling a relative position and method for operating a gravure printing system |
DE102021125336A1 (en) | 2020-10-22 | 2022-04-28 | Heidelberger Druckmaschinen Aktiengesellschaft | Device for measuring elevations on the surface of a body of revolution and system |
EP3988314A1 (en) | 2020-10-22 | 2022-04-27 | Heidelberger Druckmaschinen AG | Device for measuring a surface, or its elevations, of a rotating body and system |
CN112967991B (en) * | 2020-11-25 | 2022-10-21 | 重庆康佳光电技术研究院有限公司 | Transfer device, system and method |
CN112693215A (en) * | 2020-12-21 | 2021-04-23 | 佛山佛塑科技集团股份有限公司 | Flexible printing coding machine |
CN113370642A (en) * | 2021-06-08 | 2021-09-10 | 安徽天翔高新特种包装材料集团有限公司 | Intaglio printing press with mobile carriage supporting ink-collecting cylinder |
CN113763463B (en) * | 2021-11-10 | 2022-02-11 | 风脉能源(武汉)股份有限公司 | Method for determining position of acquisition equipment based on image data processing |
DE102022101244A1 (en) | 2022-01-20 | 2023-07-20 | Koenig & Bauer Ag | Process for calibrating color metering elements |
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US4852486A (en) * | 1988-11-25 | 1989-08-01 | Basf Corporation | Portable flexographic proofer device |
US5132911A (en) | 1989-12-27 | 1992-07-21 | Leader Engineering Fabrication, Inc. | Apparatus for mounting and proofing printing plates |
JP2903634B2 (en) * | 1990-05-22 | 1999-06-07 | 凸版印刷株式会社 | Film thickness measuring device using white light and ink supply amount controlling device using the same |
DE4427967B4 (en) | 1993-08-24 | 2004-09-30 | Heidelberger Druckmaschinen Ag | Method for presetting the pressure between ink-guiding cylinders of a printing press |
US5652659A (en) | 1995-10-09 | 1997-07-29 | Ohio Electronic Engravers, Inc. | System and method for measuring run-out and other characteristics of a workpiece mounted on an engraver |
DE19537807C1 (en) * | 1995-10-11 | 1997-02-06 | Roland Man Druckmasch | Method for determining layers |
DE20122584U1 (en) | 2001-03-27 | 2006-07-27 | Windmöller & Hölscher Kg | Print image setting device for rotary printing machine has camera feeding successively acquired print images to control or regulating unit that produces signals for participating rollers |
DE10211870B4 (en) * | 2001-03-29 | 2010-07-29 | Heidelberger Druckmaschinen Ag | Method for adjusting two rollers of a printing unit which can be applied to one another |
DE602006012688D1 (en) | 2006-10-23 | 2010-04-15 | Fischer & Krecke Gmbh | Method, Monatagevorrichtung and control unit for adjusting a roller in a printing press |
JP2009107188A (en) * | 2007-10-29 | 2009-05-21 | Mitsubishi Heavy Ind Ltd | Device and method for setting zero point of ink supply arrangement of printing machine, and device and method for adjusting ink supply arrangement |
DE102008025053B4 (en) | 2008-01-18 | 2023-07-06 | Garmin Switzerland Gmbh | navigation device |
DE102009025053A1 (en) | 2009-06-10 | 2010-12-16 | Windmöller & Hölscher Kg | Device and method for mutual hiring at least two cylinders of a printing press |
-
2010
- 2010-05-07 EP EP10162344A patent/EP2384892A1/en not_active Withdrawn
-
2011
- 2011-05-09 EP EP11717678.4A patent/EP2566695B1/en active Active
- 2011-05-09 ES ES11717678.4T patent/ES2478247T3/en active Active
- 2011-05-09 ES ES14157875.7T patent/ES2595256T3/en active Active
- 2011-05-09 WO PCT/EP2011/057417 patent/WO2011138466A1/en active Application Filing
- 2011-05-09 EP EP14157875.7A patent/EP2759407B1/en active Active
- 2011-05-09 US US13/696,700 patent/US20130291749A1/en not_active Abandoned
-
2014
- 2014-12-15 US US14/570,134 patent/US20150210058A1/en not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
WO2011138466A1 (en) | 2011-11-10 |
ES2478247T3 (en) | 2014-07-21 |
US20150210058A1 (en) | 2015-07-30 |
EP2566695A1 (en) | 2013-03-13 |
EP2759407A2 (en) | 2014-07-30 |
EP2759407B1 (en) | 2016-07-13 |
EP2759407A3 (en) | 2015-05-06 |
US20130291749A1 (en) | 2013-11-07 |
EP2384892A1 (en) | 2011-11-09 |
ES2595256T3 (en) | 2016-12-28 |
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