EP2776247B1 - Method for setting the spacings between cylinders of an inking unit, and printing press - Google Patents
Method for setting the spacings between cylinders of an inking unit, and printing press Download PDFInfo
- Publication number
- EP2776247B1 EP2776247B1 EP12779046.7A EP12779046A EP2776247B1 EP 2776247 B1 EP2776247 B1 EP 2776247B1 EP 12779046 A EP12779046 A EP 12779046A EP 2776247 B1 EP2776247 B1 EP 2776247B1
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- EP
- European Patent Office
- Prior art keywords
- cylinder
- anilox roller
- format
- contact
- gap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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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
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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
- B41F31/004—Driving means for ink rollers
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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
- B41F13/24—Cylinder-tripping devices; Cylinder-impression adjustments
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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
- 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
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/04—Tripping devices or stop-motions
- B41F33/10—Tripping devices or stop-motions for starting or stopping operation of damping or inking units
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
- B41P2200/00—Printing processes
- B41P2200/10—Relief printing
- B41P2200/12—Flexographic printing
Definitions
- the invention relates to a method for adjusting the distances between the cylinders of an inking unit and a central cylinder of a flexographic printing machine and a corresponding flexographic printing machine.
- Another method for adjusting the relative positions of the cylinder is from the document DE 102 11 870 A1 known.
- this stoppage forms by the drying paint a strip on the peripheral surface of the affected cylinder.
- the width of these strips - which is equivalent to their extent in the circumferential direction - is a measure of the contact pressure between the two cylinders involved. Therefore, this width is according to the cited Document may be measured with a camera, and the measured value serves as the basis for optimizing the contact pressure.
- the publication DE 102 11 870 A1 deals with offset printing machines in which ink and dampening solution is passed through a variety of different cylinders until these raw materials of the offset printing process reach the printing plate cylinder and finally the substrate. Therefore, in the document DE 102 11 870 A1 also proposed to hang a camera device so pivotally in an inking unit, that after pivoting the camera device, the peripheral surfaces of different printing cylinder can be examined.
- the illustrated measuring method has proved to be unsuitable for various printing methods, including high-pressure printing.
- these printing methods among other things due to relatively thick flexible layers on the surfaces of some cylinders large inaccuracies in the adjustment of the distance between the cylinders.
- the object of the invention is to improve the generic method and the generic flexographic printing machine with regard to the adjustment of the distances of the cylinders involved in the printing process.
- the quality of the adjustment of the relative cylinder positions with respect to the second cylinder gap can then be checked again by measurements. It is conceivable to carry out these measurements on different cylinder surfaces. However, it is advantageous to observe only one cylinder surface. It has been found that the measurement can take place on a surface of a cylinder which is either upstream of the two cylinder gaps or which delimits the first cylinder gap to the front in the transport direction of the ink to the printing material. This is the case, for example, with the aforementioned inking roller. In flexographic printing presses, platens or anilox rolls are used to color printing plate cylinders.
- EP 2 384 892 A1 and WO 2011/138466 A1 is executed already leads to a contact between cylinders to a change in the ink layer on the color transferred cylinder, even if no ink transfer has occurred.
- a color transfer can also be measured on the color receiving cylinder, as on a printing plate cylinder.
- the measurement of the ink layer directly on the cylinder surface, d. H. without media such as substrate or additional inserted slip into the cylinder gap are introduced for the purpose of pressure medium absorption.
- the first cylinder gap in which the findings are obtained on the basis of which the adjustment or presetting of the second gap takes place, is the cylinder gap or roller nip which comes first in the color transport direction. It should be noted at this point that the terms cylinder and roller in the present document are interchangeable or equivalently used.
- the cylinder in addition or as an alternative to the rotation in the color transfer, can rotate during the measurement.
- the cylinder can rotate during the measurement.
- different angular amounts by which the cylinder turns advantageous.
- the rotation of both cylinders or rollers, which delimit a nip is advantageous.
- a ramp ride may be to incrementally set the cylinders delimiting the inking gap, awaiting a number of revolutions of the cylinder on which the measurements are taken, at or after each step, until a measurement is made.
- the rollers limiting it are put together against the next cylinder - often an impression cylinder.
- the involved cylinders rotate a second number M of revolutions until a measurement is again carried out.
- the second number M is advantageously greater than the first number N.
- the control device checks which areas already have contact in the height profile of the cliché with roughly set roll spacing, and calculates the underlying profile depths in the cliché as the basis for the additionally required approximation.
- control device will control the processes taking place during the measurement, that is to say that all of the aforementioned method steps can take place in a computer-implemented manner and the control device is set such that it can execute it independently. This applies to all procedures described and requested in this document.
- Fig. 1 1 shows a functional sketch of an inking unit 1.
- the ink 2 required for printing is supplied to the inking unit 1 via the ink chamber doctor blade 3.
- the ink chamber doctor blade 3 is placed against the anilox roller 5 and transfers color to the surface of the anilox roller 5, as can be recognized on the ink film 4 on the surface of the anilox roller 5.
- the screen roller 5 is in turn employed on the format cylinder 6 and rotates in the direction of the arrow 10. It 5 also transfers color from the ink film 4 to the plate 7 of the format cylinder 6, while this 6 rotates in the direction of the arrow 11.
- the format cylinder 6 still has a second cliché 8.
- This second cliché 8 rolls straight off with the impression cylinder 9 and transfers color to the substrate, which rests on the surface of the impression cylinder 9, but is not shown.
- the impression cylinder rotates in the direction of arrow 12. From the FIG. 1 also shows that the cliché 8 when rolling off with the impression cylinder largely gives off the color film to the substrate. This also applies to the anilox roller 5 which, after unrolling with the cliché 7, has a largely ink-free surface 13.
- the partial area of the surface of the anilox roller 5 occupied by the term "the largely color-free surface 13" is a surface area which, after its passage through the ink reservoir of the ink chamber doctor blade 3, is in contact with a surface portion of the format cylinder 6, that has experienced with one of the two clichés 7 and 8. In this contact, a color transfer may already have come about, but it may also have come only to a change in the surface of the ink film 4. In both cases, it is possible that a noticeable change in the inspection behavior of the color film or the relevant surface of the anilox roller in the context of the measurement by the sensor 15 is recorded. In that regard, the term "largely color film-free surface 13" does not mean that no more color film must be present on the relevant surface portion of the anilox roller.
- the inking unit 1 causes a total transport of the color 2 in the Farbtransportides 14. Particularly noteworthy are the two optical sensors 15 and 16.
- the optical sensor 15 can directly examine the color film-free surface 13 of the anilox roller 5, if these 13 along the of the Arrow 10 has moved indicated direction in the working area of the first optical sensor 15.
- the optical sensor 15 can thus directly examine the effect of employment between the anilox roller 5 and the format cylinder 6.
- the quality of the setting between the anilox roller 5 and the format cylinder 6 can be determined on the basis of the change of the color film 4 by an optical measurement.
- the largely colorless surface 13 of the anilox roller After the largely colorless surface 13 of the anilox roller has passed the working area of the first optical sensor 15, it also passes the doctor blade 17, whereupon the largely colorless surface 13 is colored again inside the ink chamber doctor blade 3. After leaving the area of the ink chamber doctor blade 3, the relevant surface portion of the anilox roller 5 moves into the working range of the second optical sensor 16, which can investigate the quality of coloring of the relevant surface portion in the situation shown.
- FIGS. 4, 5 and 6 show in which sequence the rolls of a flexographic printing unit 1 can be made in the inventive manner against each other.
- FIG. 4 It can be seen that the impression cylinder 9, the format cylinder 6 and the anilox roller 5 are offset from each other.
- the curly brackets 18 and 19 hereby denote the inking gap 19 between the anilox roller 5 and the format cylinder 6 and the pressure gap 18 between the format cylinder 6 and the impression cylinder 9.
- FIG. 5 Anilox roller and format cylinder have already been hired against each other.
- an optimized setting position of these two cylinders 5 and 6 can be determined by a control and / or regulating method, in which a first optical sensor 15 observes the change in the color film which occurs on the surface of one of the two cylinders 5 involved. 6 shows as a result of employment.
- FIG. 6 The three involved cylinders 5, 6, 9 of the flexographic inking unit 1 are already in their printing position. As also already mentioned, it is the object of the present invention to use findings, that is to say data which were obtained in determining the optimized spacing of the cylinders 5 and 6, in determining the optimized distance of the cylinders 6 and 9.
- the cylinders can have different nominal diameters right from the start.
- the central impression cylinder 9 of a Monzylinderflexodruckmaschine course has a much larger nominal diameter than the anilox roller, which is mounted in an inking unit 1.
- 15 findings on the surface condition and the tolerances of the surface of the anilox roller 5 are obtained in the investigation of the color film 4 with the first optical sensor, which in the employment of the format cylinder 6 against the impression cylinder. 9 Can be used. It is particularly advantageous in this context, based on these findings, first to make a default setting of the relative position between the format cylinder 6 and the impression cylinder 9.
- FIGS. 2 and 3 the time sequence of such a Anstellluies for the cylinders 5, 6 and 9 of a flexographic printing unit 1 is shown.
- a ramp ride 20 is performed. During ramping 20, the cylinders 5, 6 delimiting a inking nip 19 rotate, and the cylinders 5, 6 are approached.
- Such a ramp ride 20 is in the Figures 3 and 7 shown.
- the vertical axis designated by the vertical variable x the relative distance of the two cylinders 5 and 6 is shown.
- the approach can be gradual (as in FIG. 7 shown) or continuously (as in FIG. 3 shown).
- a sensor records the light remitted by the anilox roller.
- the intensity I of the light reflected by the anilox roller 5 varies.
- one approach step can be carried out per rotation of the format cylinder 6 so that a contact image can be generated from the sensor signals for each roller distance. From the contact pictures and the assigned roller distances can be for The pressure required for the roll spacing can be determined at which the printing plate is completely in contact with the anilox roll, but is not over-squeezed.
- the anilox roller 5 and the format cylinder 6 are adjusted to each other.
- the distance often deviates from the desired distance S, which results from the control device known diameter data of the various cylinders 5, 6, 9 and the plates 7, 8 and the printing material.
- FIG. 7 a gradual ramping 20, in which an approximation between the cylinders 5, 6 is made in the sections 21 and takes place in the sections 22, no approximation between the cylinders.
- one or more roller rotations may be made in sections 22. After or during the at least one roller rotation, at least one measured value can be recorded. Due to the results of the ramp ride 20, the cylinders 5, 6 can be set against each other, wherein the optimized distance B, takes place at the ink transfer, the two rolls are not yet over-squeezed, is set.
- the documents show EP 2 384 892 A1 and WO 2011/138466 very exactly this procedure.
- a height profile 23, 24 of the format cylinder 6 can additionally be determined.
- a control device checks at which points at which distance -x a roller contact occurs.
- FIG. 8 Such a detailed height profile is in FIG. 8 shown.
- a first section 25 of the surface of the format cylinder 6 is shown.
- the different surface areas, which have different heights, ie distances from the format cylinder axis, are assigned different heights in micrometers.
- the respective "altitude course" (which is denoted by the radial coordinate r) along the line AA is also in FIG. 9 shown.
- FIG. 10 shows the same portion 25 of the surface of the format cylinder 6, wherein the height profile 24 is shown in less detail.
- FIG. 11 shows which measured values a first optical sensor 15 can record from such a height profile along the line AA.
- the negative light intensity -I of the remitted from the surface of the anilox roller 5 light is removed, which results along the axial direction z.
- the reflection behavior of the ink film 4 changes. This can - as already mentioned several times - by a change in the surface of the ink film and / or by a color transfer and thus a loss of color on the surface of the anilox roller 5 happen.
- the first optical sensor 15 then records a reduced light intensity I in the area of the touch.
- FIG. 12 It is shown that, in the region of a partial section 25 of the surface of the anilox roller 5, subsections 26 of the surface section 25 are usually examined again. These subsections 26 can then again be assigned light intensity values I by measurements of the first optical sensor 15.
- the rotation of the anilox roller can be recorded, inter alia, with a rotary encoder.
- Insights into the height profile of the format cylinder 6 can be used for setting the second nip (pressure nip) 18.
- This method is advantageous over a ramp ride 20 with the same evaluation as in the inking gap 19, since the intensity I of the light reflected by the anilox roller 5 changes with time delay as a measuring effect for a contact in the printing gap.
- This time-delayed run-in behavior essentially occurs only after a change in contact in the pressure gap 18. After a change in contact in the inking gap 19, measurable changes in the light intensity I of the reflected light occurring at the first optical sensor 15 occur significantly faster.
- control device can determine which additional accessory value D was still necessary for setting the inking gap 19 in order to achieve the optimized distance B.
- the control device subtracts a correction value E from the additional additional value D before it makes the provision for the additional additional value D.
- the correction value D can be obtained by empiricism and he should take into account that the surface properties of the impression cylinder 9 are of course different from those of the anilox roller 5, which is one of the causes of a different color splitting behavior in the inking nip 19 and the printing nip 18.
- the control device can base the comparison between the current measured values during the setting of the pressure gap 18 and the measured values obtained during the setting of the inking gap on the basis of different measured variables. It can thus check in which subsections 26 of the surface section 25 of the format cylinder certain light intensity values are exceeded or undershot. If, in this way, it is found that, in the current measurements, a certain proportion of the subsections 26 of a surface section 25 has significant changes in the intensity I of the reflected light and this proportion corresponds to the relevant part of a measurement in the setting of the inking gap, the control device can proceed as described above and determine the additional Beistellwert D.
- control device can also check the type in which subsections 26 of a surface section 25 are arranged relative to one another and, in the case of identical arrangement patterns, start from a measurement in a similar relative position of the surfaces to one another.
- FIG. 2 illustrates once again the timing between the setting of the coloring ball 19 and the pressure nip 18, since the FIGS. 2 and 3 show the same time span.
- the employment of the roll package of anilox roll 5 and format cylinder 6 against the impression cylinder 9 begins at time t4, to which the optimized roll spacing B between the form cylinder and anilox roller of the control device is already known. It is first set a distance at which already a partial contact between format cylinder 6 and impression cylinder 9 can be expected. Measurements are carried out which produce a measurement result which is similar to a measurement result in the setting of the coloring ball 19. The additional additional value D is determined. Immediately after the time t5, the additional provision is performed by D and the optimized distance C between the format cylinder and counter-pressure cylinder is set.
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Description
Die Erfindung betrifft ein Verfahren zum Einstellen der Abstände zwischen den Zylindern eines Farbwerkes und eines Zentralzylinders einer Flexodruckmaschine sowie eine entsprechende Flexodruckmaschine.The invention relates to a method for adjusting the distances between the cylinders of an inking unit and a central cylinder of a flexographic printing machine and a corresponding flexographic printing machine.
Verfahren zum Einstellen der Abstände zwischen Zylindern eines Farbwerkes und Druckmaschinen, die zur Anwendung dieser Verfahren geeignete Farbwerke enthalten, sind bekannt. So zeigt zum Beispiel die
Ein anderes Verfahren zur Einstellung der Relativpositionen der Zylinder ist aus der Druckschrift
Das dargestellte Messverfahren hat sich jedoch für verschiedene Druckverfahren, zu denen unter anderem Hochdruckverfahren gehören, als ungeeignet erwiesen. Bei diesen Druckverfahren ergeben sich unter anderem aufgrund von relativ dicken flexiblen Schichten auf den Oberflächen einiger Zylinder große Ungenauigkeiten bei der Einstellung des Abstandes zwischen den Zylindern.However, the illustrated measuring method has proved to be unsuitable for various printing methods, including high-pressure printing. In these printing methods, among other things due to relatively thick flexible layers on the surfaces of some cylinders large inaccuracies in the adjustment of the distance between the cylinders.
Aus der
Aus der
Aus der nachveröffentlichten
Ausgehend von der
Diese Aufgabe wird durch ein Verfahren gemäß dem Anspruch 1 und eine Flexodruckmaschine gemäß dem Anspruch 5 gelöst.This object is achieved by a method according to claim 1 and a flexographic printing machine according to
Die erfindungsgemäße Berechnung des Beistellwerts D aus dem bereits bekannten Beistellwert B kann auf verschiedene Weise geschehen:
- In der Regel wird der erste Walzenspalt von einem Einfärbezylinder, der eine Rasterwalze oder eine Glattwalze sein kann, und einem Druckplattenzylinder gebildet werden. Insbesondere bei den Druckplattenzylindern, die bei Hochdruckverfahren Verwendung finden, bestehen Höhenunterschiede auf den Druckplattenzylindern und es sind oft auch Toleranzen zu beklagen, die über das Gewollte hinausgehen. Es empfiehlt sich daher, diesen ersten Walzenspalt, der oft auch als Einfärbespalt bezeichnet wird, aufgrund sorgfältiger Messungen einzustellen.
- In general, the first nip will be formed by a inking cylinder, which may be an anilox roll or a smooth roll, and a printing plate cylinder. In particular, in the printing plate cylinders, which are used in high-pressure process, there are differences in height on the printing plate cylinders and there are often tolerances to go beyond the intended. It is therefore advisable to set this first nip, which is often referred to as Einfärbespalt, due to careful measurements.
Wie genau das geschehen kann, ist unter anderem in der vorgenannten Druckschrift
- Ein optischer Sensor ist auf die Oberfläche einer der Walzen - vorteilhafterweise der Einfärbewalze - gerichtet. Mit dem Sensor ist das von der Walzenoberfläche emittierte Licht messbar. Wenn die Zylinder, die den Walzenspalt bilden, gegeneinander eingestellt werden und beginnen, sich zu berühren, führt dies zu einer Veränderung der Messwerte des optischen Sensors. Insbesondere Messgrößen wie die spektrale Intensität des remittierten Lichts verändern sich infolge der Berührung.
- An optical sensor is directed to the surface of one of the rollers, advantageously the inking roller. With the sensor, the light emitted from the roll surface light is measurable. When the cylinders forming the nip are set against each other and begin to touch, this results in a change in the readings of the optical sensor. In particular, measured variables such as the spectral intensity of the remitted light change as a result of the contact.
Wenn in der beschriebenen Weise ermittelt worden ist, wie der relative Abstand zwischen den Zylindern, die den ersten Zylinderspalt begrenzen, zu sein hat, um einen optimierten Farbübertrag zu gewährleisten, können Rückschlüsse auf die optimierte Relativposition der Zylinder des zweiten Zylinderspaltes gezogen werden.If it has been determined in the manner described how the relative distance between the cylinders, which delimit the first cylinder gap, has to be in order to ensure an optimized ink transfer, conclusions can be drawn on the optimized relative position of the cylinders of the second cylinder gap.
Dies gilt insbesondere, wenn beide Zylinderspalte von demselben Zylinder auf einer ihrer Seiten begrenzt werden und dieser Zylinder von den beteiligten Zylindern die größten Toleranzen auf seiner Umfangsfläche aufweist. Dies ist in der Regel der Fall, wenn der erste Walzenspalt von einer Einfärbungswalze und einem Druckplattenzylinder gebildet wird und der zweite Walzenspalt von demselben Druckplattenzylinder und einem Gegendruckzylinder begrenzt wird. In diesem Fall liefert die Einstellung des ersten Walzenspalts zuverlässige Erkenntnisse über die Toleranzen und die Ausprägung der Druckform des Druckplattenzylinders.This is especially true if both cylinder gaps are delimited by the same cylinder on one of their sides and this cylinder of the cylinders involved has the largest tolerances on its peripheral surface. This is usually the case when the first nip is formed by a inking roller and a printing plate cylinder and the second nip is delimited by the same printing plate cylinder and an impression cylinder. In this case, the setting of the first nip provides reliable information about the tolerances and the characteristics of the printing plate of the printing plate cylinder.
Diese Erkenntnisse können bei der Anstellung des Druckplattenzylinders des gegen den Gegendruckzylinder oder auch gegen einen Gummizylinder genutzt werden. So kann zumindest eine Voreinstellung analog zu der Anstellsituation im ersten Walzenspalt vorgenommen werden. Natürlich sind in diesem Zusammenhang unterschiedliche Durchmesser der Einfärbezylinder und der Gegendruck- oder Gummituchzylinder bei der Einstellung zu berücksichtigen.These findings can be used in the employment of the printing plate cylinder against the counter-pressure cylinder or against a blanket cylinder. Thus, at least one default setting can be made in analogy to the Anstellsituation in the first nip. Of course, different diameters of the inking cylinders and the counterpressure or blanket cylinders are to be taken into account in the setting in this context.
Die Güte der Einstellung der relativen Zylinderpositionen in Bezug auf den zweiten Zylinderspalt kann dann wieder durch Messungen überprüft werden. Es ist denkbar, diese Messungen auf verschiedenen Zylinderoberflächen durchzuführen. Vorteilhaft ist jedoch, lediglich eine Zylinderoberfläche zu beobachten. Hierbei hat sich gezeigt, dass die Messung auf einer Oberfläche eines Zylinders erfolgen kann, der entweder den beiden Zylinderspalten vorgelagert ist oder der in der Transportrichtung der Farbe zum Bedruckstoff den ersten Zylinderspalt nach vorne begrenzt. Dies ist zum Beispiel bei der vorgenannten Einfärbungswalze der Fall. Bei Flexodruckmaschinen werden zur Einfärbung von Druckplattenzylindern Plattwalzen oder Rasterwalzen verwendet.The quality of the adjustment of the relative cylinder positions with respect to the second cylinder gap can then be checked again by measurements. It is conceivable to carry out these measurements on different cylinder surfaces. However, it is advantageous to observe only one cylinder surface. It has been found that the measurement can take place on a surface of a cylinder which is either upstream of the two cylinder gaps or which delimits the first cylinder gap to the front in the transport direction of the ink to the printing material. This is the case, for example, with the aforementioned inking roller. In flexographic printing presses, platens or anilox rolls are used to color printing plate cylinders.
Wie bereits erwähnt und wie es ausführlich in den beiden vorgenannten Druckschriften
Eine Farbübertragung ist natürlich auch auf dem Farbe empfangenden Zylinder - wie auf einem Druckplattenzylinder - zu messen. Vorteilhaft ist die Messung der Farbschicht direkt auf der Zylinderoberfläche, d. h. ohne dass Medien wie Bedruckstoff oder zusätzlich eingefügte Zettel in den Zylinderspalt zum Zwecke der Druckmittelaufnahme eingeführt werden.Of course, a color transfer can also be measured on the color receiving cylinder, as on a printing plate cylinder. Advantageously, the measurement of the ink layer directly on the cylinder surface, d. H. without media such as substrate or additional inserted slip into the cylinder gap are introduced for the purpose of pressure medium absorption.
Allgemein ist vorteilhaft, wenn der erste Zylinderspalt, in dem die Erkenntnisse gewonnen werden, aufgrund der die Einstellung oder Voreinstellung des zweiten Spaltes erfolgt, der Zylinderspalt bzw. Walzenspalt ist, der in der Farbtransportrichtung zuerst kommt. An dieser Stelle sei angemerkt, dass die Begriffe Zylinder und Walze in der vorliegenden Druckschrift austauschbar sind bzw. äquivalent verwendet werden.In general, it is advantageous if the first cylinder gap, in which the findings are obtained on the basis of which the adjustment or presetting of the second gap takes place, is the cylinder gap or roller nip which comes first in the color transport direction. It should be noted at this point that the terms cylinder and roller in the present document are interchangeable or equivalently used.
Insbesondere bei den Rampenfahrten wird es oft so sein, dass sich die Zylinder während der Messungen drehen. Das heißt, dass einmal die Zylinder miteinander in Kontakt gebracht werden, während sie sich drehen oder während sich zumindest einer der Zylinder dreht. Das heißt unter anderem, dass ein etwaiger Farbübertrag zwischen den Zylindern während der Drehung zustande kommt, was natürlich der Situation im Druckbetrieb entspricht.In particular, during ramping, it will often be the case that the cylinders rotate during the measurements. That is, once the cylinders are brought into contact with each other while rotating or while at least one of the cylinders is rotating. This means, among other things, that a possible ink transfer between the cylinders during the rotation comes about, which of course corresponds to the situation in the printing operation.
Zusätzlich oder alternativ zu der Drehung bei dem Farbübertrag kann sich auch der Zylinder, auf dessen Oberfläche gemessen wird, bei der Messung drehen. Hierbei sind verschiedene Winkelbeträge, um die sich der Zylinder dreht, vorteilhaft. Mit Blick auf die vorgenannten Zylinderdrehungen ist natürlich anzumerken, dass in der Regel die Drehung beider Zylinder oder Walzen, die einen Walzenspalt begrenzen, vorteilhaft ist.In addition or as an alternative to the rotation in the color transfer, the cylinder, on the surface of which is measured, can rotate during the measurement. Here are different angular amounts by which the cylinder turns, advantageous. With regard to the aforementioned cylinder rotations, it should of course be noted that, as a rule, the rotation of both cylinders or rollers, which delimit a nip, is advantageous.
Oft wird es nötig sein, so genannte Rampenfahrten auszuführen. Während einer Rampenfahrt drehen sich die Zylinder, die einen Zylinderspalt begrenzen, und die Zylinder werden einander angenähert. Die Annäherung kann schrittweise erfolgen. Während eines Schrittes kann der Zylinder mehrere Drehungen ausführen. Dies kann notwendig werden, da sich auch bei einer Berührung der Zylinder ein messbarer Effekt bzw. eine messbare Veränderung der Oberfläche des Farbfilms erst nach mehreren Drehungen ausprägt. Oft wird die Anzahl der Drehungen für unterschiedliche Walzenspalte unterschiedlich sein. So dürfte sich der Farbverlust schnell messen lassen, wenn der Einfärbezylinder gegen einen Druckplattenzylinder angestellt wird. Misst man jedoch die Anstellsituation in dem Druckspalt aufgrund des Farbverlusts auf der Oberfläche einer vorgelagerten Einfärbungswalze, so sind oft mehrere Umdrehungen der beteiligten Zylinder notwendig, um einen Kontakt zwischen Druck- und Gegendruckzylinder bzw. zwischen Druckzylinder und Bedruckstoff im Druckspalt zu verifizieren. Dieser Umstand führt dazu, dass die Anzahl von Drehungen der beteiligten Zylinder im Einfärbungsspalt kleiner sein sollte als im Druckspalt, wenn auf der Einfärbungswalze oder einer vorgelagerten Walze gemessen wird.Often it will be necessary to perform so-called ramps. During a ramp ride, the cylinders that limit a cylinder gap rotate and the cylinders are brought closer to each other. The approach can be gradual. During a step, the cylinder may make multiple turns. This may be necessary, since a measurable effect or a measurable change in the surface of the color film only takes place after several rotations, even if the cylinder contacts. Often the number of rotations for different nips be different. Thus, the loss of color is likely to be measured quickly when the inking cylinder is turned against a printing plate cylinder. However, if one measures the Anstellsituation in the nip due to the loss of color on the surface of an upstream inking roller, so often several revolutions of the cylinders involved are necessary to verify contact between printing and impression cylinders or between impression cylinder and substrate in the nip. This circumstance causes the number of rotations of the involved cylinders in the inking nip to be smaller than in the printing nip when measured on the inking roller or on an upstream roller.
So kann eine Rampenfahrt darin bestehen, die Zylinder, die den Einfärbungsspalt begrenzen, schrittweise gegeneinander anzustellen, wobei bei oder nach jedem Schritt eine Anzahl von Umdrehungen des Zylinders, auf dem die Messungen durchgeführt werden, abgewartet wird, bis eine Messung durchgeführt wird. Nachdem der Einfärbungsspalt eingestellt ist, werden die ihn begrenzenden Walzen gemeinsam gegen den nächsten Zylinder - oft einen Gegendruckzylinder - angestellt. Während der schrittweisen Annäherung (Rampenfahrt) drehen sich die beteiligten Zylinder eine zweite Anzahl M von Umdrehungen, bis wieder eine Messung durchgeführt wird. Die zweite Anzahl M ist hierbei vorteilhafterweise größer als die erste Anzahl N.Thus, a ramp ride may be to incrementally set the cylinders delimiting the inking gap, awaiting a number of revolutions of the cylinder on which the measurements are taken, at or after each step, until a measurement is made. After the inking gap is set, the rollers limiting it are put together against the next cylinder - often an impression cylinder. During the stepwise approach (ramp travel), the involved cylinders rotate a second number M of revolutions until a measurement is again carried out. The second number M is advantageously greater than the first number N.
Bei einer Flexodruckmaschine kann die Einstellung des Druckspaltes zwischen Gegendruckzylinder und Formatzylinder daher folgendermaßen stattfinden, nachdem der Einfärbungsspalt im Rahmen einer Rampenfahrt eingestellt wurde und während die Rasterwalze und der Formatzylinder als Walzenpaket, unter Beibehaltung der optimierten Relativposition, gegen den Gegendruckszylinder angestellt werden:
- Auf der Rasterwalze zeichnet der oben genannte Sensor nach Ablauf einer bekannten zeitlichen Verzögerung des Messeffekts die Intensität des reflektierten Lichts auf. Hoch liegende Klischeebereiche, die jetzt zusätzlich zum Rasterwalzenkontakt auch einen Kontakt zum Gegendruckzylinder aufweisen, führen auf der Rasterwalze zu einer anderen Lichtintensität als tief liegende Klischeebereiche, die nur einen Kontakt zur Rasterwalze und keinen Kontakt zum Gegendruckzylinder haben. Aus diesen Lichtintensitäten ermittelt eine Steuerungsvorrichtung die Bereiche des Klischees, die im zweiten Walzenspalt (Druckspalt) Kontakt aufweisen, und die Bereiche, die hier keinen Kontakt aufweisen. Diese so gewonnenen Kontaktinformationen (Kontaktbild) bringt die Steuerungseinrichtung mit dem zuvor ermittelten Höhenprofil zusammen. Durch Vergleich des Kontaktbildes mit dem Höhenprofil kann die Steuerungsvorrichtung die zusätzlich erforderliche Annäherung des Formatzylinders an den Gegendruckzylinder ermitteln, so dass auch dieser Walzenspalt vollständig Farbe überträgt und nicht überquetscht.
- On the anilox roller, the above-mentioned sensor records the intensity of the reflected light after a known time delay of the measuring effect. High lying cliché areas, which now also have contact to the impression cylinder in addition to the anilox roller contact, lead to the anilox roller to a different light intensity as deep cliché areas, the only contact with the anilox roller and no contact with the Have impression cylinder. From these light intensities, a control device determines the areas of the cliché which have contact in the second nip (nip) and the areas which are not in contact here. This contact information obtained in this way (contact image) brings together the control device with the previously determined height profile. By comparing the contact image with the height profile, the control device can determine the additional required approximation of the format cylinder to the impression cylinder, so that even this nip completely transfers color and not over-squeezed.
Beim Vergleich des Kontaktbildes mit dem Höhenprofil überprüft die Steuerungseinrichtung, welche Bereiche im Höhenprofil des Klischees mit grob eingestelltem Walzenabstand bereits Kontakt aufweisen, und berechnet die darunter liegenden Profiltiefen im Klischee als Basis für die zusätzlich erforderliche Annäherung.When comparing the contact image with the height profile, the control device checks which areas already have contact in the height profile of the cliché with roughly set roll spacing, and calculates the underlying profile depths in the cliché as the basis for the additionally required approximation.
In der Regel wird die Steuervorrichtung die bei der Messung ablaufenden Vorgänge steuern, das heißt, dass alle vorgenannten Verfahrensschritte computerimplementiert ablaufen können und die Steuervorrichtung derart eingestellt ist, dass sie sie selbständig ausführen kann. Dies gilt für alle in dieser Druckschrift beschriebenen und beantragten Verfahren.In general, the control device will control the processes taking place during the measurement, that is to say that all of the aforementioned method steps can take place in a computer-implemented manner and the control device is set such that it can execute it independently. This applies to all procedures described and requested in this document.
Weitere Ausführungsbeispiele der Erfindung gehen aus der gegenständlichen Beschreibung und den Ansprüchen hervor.
Die einzelnen Figuren zeigen:
- Fig. 1
- Seitenansicht eines Druckwerks
- Fig. 2
- Der Verlauf einer ersten Einstellung eines Druckspalts
- Fig. 3
- Der Verlauf einer ersten Einstellung eines Einfärbespalts
- Fig. 4
- Eine Skizze einer ersten Anstellsituation der am Druckprozess beteiligten Zylinder eines Flexodruckwerks
- Fig. 5
- Eine Skizze einer zweiten Anstellsituation der am Druckprozess beteiligten Zylinder eines Flexodruckwerks
- Fig. 6
- Eine Skizze einer dritten Anstellsituation der am Druckprozess beteiligten Zylinder eines Flexodruckwerks
- Fig. 7
- Der Verlauf einer zweiten Einstellung eines Einfärbespalts
- Fig. 8
- Ein detailliertes Höhenprofil eines Oberflächenabschnitts 25 des Formatzyl inders
- Fig. 9
- Den Höhenverlauf entlang der Linie A-A aus
Figur 8 - Fig. 10
- Ein vereinfachtes Höhenprofil des Oberflächenabschnitts 25 des Formatzyl inders
- Fig. 11
- Den Verlauf der Intensität des emittierten Lichts bei einer Messung entlang der Linie A-A
- Fig. 12
- Das vereinfachte
Höhenprofil aus Figur 10 ,wobei Unterabschnitte 26 des Oberflächenabschnitts 25 eingezeichnet sind - Fig. 13
- Der Verlauf einer zweiten Einstellung eines Druckspalts
The individual figures show:
- Fig. 1
- Side view of a printing unit
- Fig. 2
- The course of a first setting of a pressure gap
- Fig. 3
- The course of a first setting of a coloring gap
- Fig. 4
- A sketch of a first Anstellsituation the participating in the printing process cylinder of a flexographic printing
- Fig. 5
- A sketch of a second Anstellsituation the participating in the printing process cylinder of a flexographic printing
- Fig. 6
- A sketch of a third Anstellsituation the participating in the printing process cylinder of a flexographic printing
- Fig. 7
- The course of a second setting of a coloring gap
- Fig. 8
- A detailed height profile of a
surface portion 25 of the Formatzyl Indian - Fig. 9
- The height gradient along the line AA
FIG. 8 - Fig. 10
- A simplified height profile of the
surface portion 25 of the Formatzyl Indian - Fig. 11
- The course of the intensity of the emitted light during a measurement along the line AA
- Fig. 12
- The simplified height profile
FIG. 10 , whereinsubsections 26 of thesurface portion 25 are drawn - Fig. 13
- The course of a second setting of a pressure gap
Der Formatzylinder 6 weist noch ein zweites Klischee 8 auf. Dieses zweite Klischee 8 rollt gerade mit dem Gegendruckzylinder 9 ab und überträgt Farbe auf den Bedruckstoff, der auf der Oberfläche des Gegendruckzylinders 9 aufliegt, jedoch nicht dargestellt ist. Der Gegendruckzylinder dreht sich in Richtung des Pfeils 12. Aus der
Das Farbwerk 1 bewirkt insgesamt einen Transport der Farbe 2 in der Farbtransportrichtung 14. Besonders zu erwähnen sind die beiden optischen Sensoren 15 und 16. Der optische Sensor 15 kann unmittelbar die farbfilmfreie Oberfläche 13 der Rasterwalze 5 untersuchen, wenn sich diese 13 entlang der von dem Pfeil 10 angezeigten Richtung in den Arbeitsbereich des ersten optischen Sensors 15 bewegt hat.The inking unit 1 causes a total transport of the
In dieser Position kann der optische Sensor 15 also direkt die Wirkung der Anstellung zwischen der Rasterwalze 5 und dem Formatzylinder 6 untersuchen. Wie bereits in der einleitenden Beschreibung erwähnt, lässt sich anhand der Änderung des Farbfilms 4 durch eine optische Messung die Güte der Anstellung zwischen der Rasterwalze 5 und dem Formatzylinder 6 ermitteln.In this position, the
Nachdem die weitgehend farbfilmlose Oberfläche 13 der Rasterwalze den Arbeitsbereich des ersten optischen Sensors 15 passiert hat, passiert sie auch das Rakelmesser 17, woraufhin die weitgehend farbfilmlose Oberfläche 13 im Inneren des Farbkammerrakels 3 wieder eingefärbt wird. Nach dem Verlassen des Bereichs des Farbkammerrakels 3 bewegt sich der betreffende Oberflächenabschnitt der Rasterwalze 5 in den Arbeitsbereich des zweiten optischen Sensors 16, der in der dargestellten Situation die Güte der Einfärbung des betreffenden Oberflächenabschnitts untersuchen kann.After the largely
Die
In
In
In
Hierbei ist natürlich zu berücksichtigen, dass die Zylinder von Anfang an unterschiedliche Solldurchmesser haben können. So besitzt der zentrale Gegendruckzylinder 9 einer Zentralzylinderflexodruckmaschine natürlich einen sehr viel größeren Nenndurchmesser als die Rasterwalze, die in einem Farbwerk 1 montiert wird. Bei der Anstellung der Rasterwalze 5 gegen den Formatzylinder 6 werden jedoch im Rahmen der Untersuchung des Farbfilms 4 mit dem ersten optischen Sensor 15 Erkenntnisse über die Oberflächenbeschaffenheit und die Toleranzen der Oberfläche der Rasterwalze 5 gewonnen, die bei der Anstellung des Formatzylinders 6 gegen den Gegendruckzylinder 9 Verwendung finden können. Es ist in diesem Zusammenhang besonders vorteilhaft, aufgrund dieser Erkenntnisse zunächst eine Voreinstellung der Relativposition zwischen dem Formatzylinder 6 und dem Gegendruckzylinder 9 vorzunehmen.Of course, it should be noted that the cylinders can have different nominal diameters right from the start. Thus, the
Es hat sich gezeigt, dass es möglich ist, auch die Relativposition von Formatzylinder 6 und Gegendruckzylinder 9 mit einem Sensor zu untersuchen, der den Farbfilm auf einer dem Gegendruckzylinder in der Farbtransportrichtung 14 vorgelagerten Walze (wie dem Formatzylinder 6) untersucht. Überraschenderweise gilt dies auch, wenn die Untersuchung auf der Oberfläche eines bereits dem Formatzylinder 6 vorgelagerten Zylinders vorgenommen wird. Vorteilhafterweise kann diese Untersuchung damit auch auf der Oberfläche der Rasterwalze vorgenommen werden, wie dies ja in
Dann ist es möglich, alle drei Zylinder 5, 6, 9 weiter gegeneinander abrollen zu lassen und die Farbveränderung (vor allem Intensität des remittierten Lichts I) auf der Rasterwalzenoberfläche mit dem ersten optischen Sensor 15 zu beobachten. Nach einiger Zeit stellen sich messbare Veränderungen ein, die das Auffinden der optimierten Anstellposition C des Walzenpakets aus Rasterwalze 5 und Formatzylinder 6 zum Gegendruckzylinder 9 ermöglichen.It has been shown that it is also possible to investigate the relative position of the
Then it is possible to let all three
In den
Zur Einstellung des Einfärbespalts 19 wird typischerweise eine Rampenfahrt 20 ausgeführt. Während der Rampenfahrt 20 drehen sich die Zylinder 5, 6, die einen Einfärbespalt 19 begrenzen, und die Zylinder 5, 6 werden einander angenähert. Eine solche Rampenfahrt 20 ist in den
Auf der mit der Laufvariablen x bezeichneten vertikalen Achse ist der relative Abstand der beiden Zylinder 5 und 6 dargestellt.In the
To set the
On the vertical axis designated by the vertical variable x, the relative distance of the two
Die Annäherung kann schrittweise (wie in
Zu beachten ist bei der Betrachtung der
Wie bereits erwähnt zeigt
Aus den Kontaktbildern und den zugeordneten Walzenabständen kann zusätzlich ein Höhenprofil 23, 24 des Formatzylinders 6 ermittelt werden. Dazu überprüft eine Steuerungsvorrichtung, an welchen Stellen bei welchem Abstand -x ein Walzenkontakt auftritt. Ein solches detailliertes Höhenprofil ist in
Die Benennung der Koordinatenachsen in dieser Druckschrift (r, z und ϕ) entspricht dem gängigen Gebrauch von Zylinderkoordinaten in Bezug auf den Formatzylinder 6.The designation of the coordinate axes in this document (r, z and φ) corresponds to the common use of cylindrical coordinates with respect to the
In
Erkenntnisse zu dem Höhenprofil des Formatzylinders 6 können für die Einstellung des zweiten Walzenspalts (Druckspalt) 18 verwendet werden. Dieses Verfahren ist gegenüber einer Rampenfahrt 20 mit gleicher Auswertung wie im Einfärbespalt 19 von Vorteil, da sich die Intensität I des von der Rasterwalze 5 reflektierten Lichts als Messeffekt für einen Kontakt im Druckspalt zeitlich verzögert verändert. Dieses zeitlich verzögerte Einlaufverhalten tritt im Wesentlichen nur nach einer Kontaktveränderung im Druckspalt 18 auf. Nach einer Kontaktveränderung im Einfärbespalt 19 kommt es zu deutlich schneller auftretenden messbaren Veränderungen der Lichtintensität I des remittierten Lichtes bei dem ersten optischen Sensor 15.Insights into the height profile of the
Auf Basis des Höhenprofils des Formatzylinders kann der Walzenabstand zwischen dem Formatzylinder 6 und dem Gegendruckzylinder 9 zumindest grob so eingestellt werden, dass Teilbereiche des Klischees 7, 8 in Kontakt mit dem Gegendruckzylinder treten und andere Teilbereich nicht. Dies kann folgendermaßen geschehen:
- Bei einer vorhergegangenen Einstellung des Abstandes der
Rasterwalze 5 und des Formatzylinder 6 hat die Steuervorrichtung zumindest Teile der Messergebnisse des ersten optischenSensors 15 zusammen mit den Relativpositionen x der betreffenden Walzen 5 und 6 aufgezeichnet und gespeichert.
- With a previous adjustment of the distance of the
anilox roller 5 and theformat cylinder 6, the control device has recorded and stored at least parts of the measurement results of the firstoptical sensor 15 together with the relative positions x of the 5 and 6.respective rollers
So kann in einer Speichervorrichtung der Steuervorrichtung abgelegt sein, bei welchem relativen Walzenabstand der Rasterwalze 5 und das Formatzylinders 6 sich in bestimmten Flächenabschnitten 26 bestimmte Lichtintensitätswerte ergeben haben. Zusammenfassend kann man sagen, dass Wertepaare aus Daten zu dem Kontaktbild und der relativen Zylinderposition abgelegt werden.Thus, it can be stored in a storage device of the control device at which relative roller spacing of the
Falls die Steuervorrichtung nun bei der Annäherung des Walzenpakets aus Rasterwalze 5 und Formatzylinder 6 ähnliche Werte ermittelt, kann die Steuervorrichtung ermitteln, welcher zusätzliche Beistellenwert D bei der Einstellung des Einfärbespaltes 19 noch notwendig war, um den optimierten Abstand B zu erreichen.If the control device now determines similar values when the roller assembly of
Ein Beispiel für eine solche Vorgehensweise ist in
- Bis zum Zeitpunkt t1 wird das Walzenpaket aus Rasterwalze und Formatzylinder an den Gegendruckzylinder angestellt, und es werden jeweils nach einer festen Anzahl von Umdrehungen der beteiligten Walzen, die natürlich je nach ihrem Durchmesser unterschiedlich sein können, Messungen
mit dem Sensor 15 durchgeführt (Rampenfahrt 20). Zum Zeitpunkt t1 erfolgt eine Messung, die die Steuervorrichtung nach einem Vergleich mit den Messungen bei der Einstellung des Einfärbespalts als ähnlich mit einem Messergebnis (bei der Einstellung des Einfärbespalts) erkennt. Da in der Steuervorrichtung ebenfalls abgelegt ist, welche Relativposition Rasterwalze und Formatzylinder 5 bei der betreffenden Messung gehabt haben, kann die Steuervorrichtung durch die Bildung der Differenz mit der endgültigen optimierten Anstellposition B ermitteln, welcher zusätzliche Beistellwert D noch zur Einstellung des Einfärbespalts 19 notwendig war. Die Steuervorrichtung verändert daher die Relativposition des Formatzylinders zu dem Gegendruckzylinder bis zum Zeitpunkt t2 um diesen zusätzlichen Beistellwert D.
- Until the time t1, the roll pack of anilox roll and format cylinder is set against the impression cylinder, and measurements are always carried out with the
sensor 15 after a fixed number of revolutions of the rolls involved, which of course may vary depending on their diameter (ramp travel 20). , At time t1, a measurement is made which the controller recognizes as being similar to a measurement result (in the setting of the inking gap) after comparison with the measurements in the setting of the inking gap. Since in the control device is also stored, which relative position anilox roller andformat cylinder 5 have had in the relevant measurement, the control device can be optimized by forming the difference with the final Anstellposition B determine which additional Beistellwert D was still necessary to adjust theEinärbespalts 19. The control device therefore changes the relative position of the format cylinder to the impression cylinder until the time t2 by this additional Beistellwert D.
Zum Zeitpunkt t2 wird eine erneute Messung durchgeführt, die ergibt, dass es einer weiteren Beistellung bedarf, um den optimierten Abstand C zu erreichen. Dieser C wird zum Zeitpunkt t3 erreicht.At the time t2, a new measurement is performed, which shows that it requires a further provision in order to achieve the optimized distance C. This C is reached at time t3.
Oft wird es so sein, dass die Steuervorrichtung von dem zusätzlichen Beistellwert D noch einen Korrekturwert E abzieht, bevor sie die Beistellung um den zusätzlichen Beistellwert D vornimmt. Der Korrekturwert D kann durch Empirik gewonnen werden und er sollte berücksichtigen, dass die Oberflächeneigenschaften des Gegendruckzylinders 9 natürlich anders sind als die der Rasterwalze 5, was eine der Ursachen für ein unterschiedliches Farbspaltungsverhalten in dem Einfärbespalt 19 und dem Druckspalt 18 ist.Often it will be the case that the control device subtracts a correction value E from the additional additional value D before it makes the provision for the additional additional value D. The correction value D can be obtained by empiricism and he should take into account that the surface properties of the
Die Steuervorrichtung kann dem Vergleich zwischen den aktuellen Messwerten während der Einstellung des Druckspalts 18 und den bei der Einstellung des Einfärbespalts gewonnen Messwerten verschiedene Messgrößen zugrunde legen. So kann sie prüfen, in welchen Unterabschnitten 26 des Oberflächenabschnitts 25 des Formatszylinders bestimmte Lichtintensitätswerte über- oder unterschritten werden. Falls sich auf diese Weise ergibt, dass bei den aktuellen Messungen ein bestimmter Anteil der Unterabschnitte 26 eines Oberflächenabschnitts 25 signifikante Änderungen der Intensität I des remittierten Lichtes aufweist und dieser Anteil dem betreffenden Anteil einer Messung bei der Einstellung des Einfärbespaltes entspricht, kann die Steuervorrichtung in der oben beschriebenen Weise verfahren und den zusätzlichen Beistellwert D ermitteln.The control device can base the comparison between the current measured values during the setting of the
Zusätzlich oder ergänzend kann die Steuervorrichtung jedoch auch prüfen, in welcher Art Unterabschnitte 26 eines Oberflächenabschnitts 25 zueinander angeordnet sind und bei gleichen Anordnungsmustern von einer Messung in einer ähnlichen Relativposition der Oberflächen zueinander ausgehen.In addition or in addition, however, the control device can also check the type in which subsections 26 of a
Claims (8)
- A method for setting the spacings between the cylinders of an inking unit and a central cylinder of a flexographic printing machine, wherein the inking unit comprises an ink chamber doctor blade (3), an anilox roller (5) and a format cylinder (6) with a printing plate (7, 8) and wherein the ink chamber doctor blade (3) is positioned on the anilox roller (5) for the transfer of ink onto the surface of the anilox roller (5),
wherein the spacing between the anilox roller (5) and the format cylinder (6) is defined by a first cylinder gap (19) and the spacing between the format cylinder (6) and the central cylinder (9) is defined by a second cylinder gap (18), and
wherein an optical sensor (15) is provided for recording the reflected luminous intensity of that surface of the anilox roller (5), which is located in relation to the direction of rotation of the anilox roller behind the first cylinder gap (19) and in front of the ink chamber doctor blade (3),
having the following steps:- Reduction of the first cylinder gap (19) as well as detection of that point in dependence on the luminous intensity, at which the anilox roller (5) and the format cylinder (6) begin to come into contact,- Further reduction of the first cylinder gap (19) in dependence on the luminous intensity up to the value provided B, in which the printing plate (7, 8) is completely in contact with the anilox roller (5), but is not pinched together,- Reduction of the second cylinder gap (18), wherein the roller packet consisting of anilox roller (5) and format cylinder (6) is positioned on the central cylinder (9) while maintaining the optimized relative position, as well as detection of that point in dependence on the luminous intensity, at which the format cylinder (6) and the central cylinder (9) begin to come into contact,- Further reduction of the second cylinder gap (18), wherein the roller packet consisting of anilox roller (5) and format cylinder (6) is positioned on the central cylinder (9) while maintaining the optimized relative position, up to the value provided D, at which the printing plate (7, 8) is completely in contact with the central cylinder (9), but is not pinched together, wherein the value provided D is calculated from the already known value provided B. - A method according to Claim 1, wherein the point, at which the format cylinder (6) and the central cylinder (9) begin to come into contact, is determined, in that the corresponding luminous intensities are recognized as similar to the point, at which the anilox roller (5) and the format cylinder (6) begin to come into contact.
- A method according to any one of Claims 1 - 2, wherein the calculated value provided D is corrected by a correction value E, wherein the correction value E takes into consideration the different surface qualities of the central cylinder (9) and the anilox roller (5).
- A method according to any one of Claims 1 - 3, wherein in dependence on the luminous intensity a height profile of the format cylinder (6) is determined, in that it is checked, in what areas at what spacing a contact occurs between the format cylinder (6) and the anilox roller (5), wherein the height profile is used for adjusting the second cylinder gap (18).
- A flexographic printing machine having a control device for setting the spacings between the cylinders of an inking unit and a central cylinder,
wherein the inking unit comprises an ink chamber doctor blade (3), an anilox roller (5) and a format cylinder (6) with a printing plate (7, 8) and wherein the ink chamber doctor blade (3) is positioned on the anilox roller (5) for the transfer of ink onto the surface of the anilox roller (5),
wherein the spacing between the anilox roller (5) and the format cylinder (6) is defined by a first cylinder gap (19) and the spacing between the format cylinder (6) and the central cylinder (9) is defined by a second cylinder gap (18), and
wherein an optical sensor (15) is provided for recording the reflected luminous intensity of that surface of the anilox roller (5), which is located in relation to the direction of rotation of the anilox roller behind the first cylinder gap (19) and in front of the ink chamber doctor blade (3),
wherein the control device is arranged to carry out the following steps:- Reduction of the first cylinder gap (19) as well as detection of that point in dependence on the luminous intensity, at which the anilox roller (5) and the format cylinder (6) begin to come into in contact,- Further reduction of the first cylinder gap (19) in dependence on the luminous intensity up to the value provided B, in which the printing plate (7, 8) is completely in contact with the anilox roller (5), but is not pinched together,- Reduction of the second cylinder gap (18), wherein the roller packet consisting of anilox roller (5) and format cylinder (6) is positioned on the central cylinder (9) while maintaining the optimized relative position, as well as detection of that point in dependence on the luminous intensity, at which the format cylinder (6) and the central cylinder (9) begin to come into contact,- Further reduction of the second cylinder gap (18), wherein the roller packet consisting of anilox roller (5) and format cylinder (6) is positioned on the central cylinder (9) while maintaining the optimized relative position, up to the value provided D, at which the printing plate (7, 8) is completely in contact with the central cylinder (9), but is not pinched together, wherein the value provided D is calculated from the already known value provided B. - A flexographic printing machine according to Claim 5, wherein the point, at which the format cylinder (6) and the central cylinder (9) begin to come into contact, is determined by the control device, in that the corresponding luminous intensities are recognized as similar to the point, at which the anilox roller (5) and the format cylinder (6) begin to come into contact.
- A flexographic printing machine according to Claims 5 - 6, wherein the control device corrects the calculated value provided D by a correction value E, wherein the correction value E takes into consideration the different surface qualities of the central cylinder (9) and the anilox roller (5).
- A flexographic printing machine according to any one of Claims 5 - 7, wherein the control device in dependence on the luminous intensity determines a height profile of the format cylinder (6), in that it is checked, in what areas at what spacing a contact occurs between the format cylinder (6) and the anilox roller (5), wherein the height profile is used for adjusting the second cylinder gap (18).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102011086047A DE102011086047A1 (en) | 2011-11-09 | 2011-11-09 | Method for adjusting the distances between cylinders of an inking unit and printing machine |
PCT/EP2012/071161 WO2013068239A2 (en) | 2011-11-09 | 2012-10-25 | Method for setting the spacings between cylinders of an inking unit, and printing press |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2776247A2 EP2776247A2 (en) | 2014-09-17 |
EP2776247B1 true EP2776247B1 (en) | 2017-10-25 |
Family
ID=47088871
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12779046.7A Not-in-force EP2776247B1 (en) | 2011-11-09 | 2012-10-25 | Method for setting the spacings between cylinders of an inking unit, and printing press |
Country Status (5)
Country | Link |
---|---|
US (1) | US20140251169A1 (en) |
EP (1) | EP2776247B1 (en) |
DE (1) | DE102011086047A1 (en) |
ES (1) | ES2652035T3 (en) |
WO (1) | WO2013068239A2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014101433B4 (en) * | 2014-02-05 | 2016-03-24 | CONPRINTA GmbH & Co. KG | Printing unit for a flexographic printing machine and method for its operation |
PL3738773T3 (en) * | 2019-05-09 | 2022-12-05 | Heidelberger Druckmaschinen Ag | Device for measuring elevations of the surface of a rotating body |
DE102021125060A1 (en) * | 2020-10-22 | 2022-04-28 | Heidelberger Druckmaschinen Aktiengesellschaft | Method for operating a flexographic printing machine, flexographic printing machine, system and sleeve for a flexographic printing forme |
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 |
ES2947907T3 (en) * | 2020-10-22 | 2023-08-24 | Heidelberger Druckmasch Ag | Method for operating a flexographic printing machine as well as a flexographic printing machine and system comprising a flexographic printing machine and a measuring device for measuring the dot density of a flexographic printing form or cap |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3628464C1 (en) * | 1986-08-21 | 1988-03-10 | Koenig & Bauer Ag | Ink supply in an inking unit of a sheet-fed rotary printing press |
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 |
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 |
DE102009046566B4 (en) * | 2009-11-10 | 2017-06-01 | Windmöller & Hölscher Kg | Body with a register marker field |
DE102010000907B4 (en) * | 2010-01-14 | 2015-09-10 | Windmöller & Hölscher Kg | Method and device for optimizing the relative position of at least two printing cylinder |
EP2384892A1 (en) | 2010-05-07 | 2011-11-09 | Windmöller & Hölscher KG | 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 |
-
2011
- 2011-11-09 DE DE102011086047A patent/DE102011086047A1/en not_active Ceased
-
2012
- 2012-10-25 WO PCT/EP2012/071161 patent/WO2013068239A2/en active Application Filing
- 2012-10-25 US US14/350,641 patent/US20140251169A1/en not_active Abandoned
- 2012-10-25 EP EP12779046.7A patent/EP2776247B1/en not_active Not-in-force
- 2012-10-25 ES ES12779046.7T patent/ES2652035T3/en active Active
Non-Patent Citations (1)
Title |
---|
None * |
Also Published As
Publication number | Publication date |
---|---|
EP2776247A2 (en) | 2014-09-17 |
WO2013068239A3 (en) | 2013-08-15 |
DE102011086047A1 (en) | 2013-05-16 |
WO2013068239A2 (en) | 2013-05-16 |
ES2652035T3 (en) | 2018-01-31 |
US20140251169A1 (en) | 2014-09-11 |
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