EP2776247A2 - 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 pressInfo
- Publication number
- EP2776247A2 EP2776247A2 EP12779046.7A EP12779046A EP2776247A2 EP 2776247 A2 EP2776247 A2 EP 2776247A2 EP 12779046 A EP12779046 A EP 12779046A EP 2776247 A2 EP2776247 A2 EP 2776247A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder
- cylinders
- distance
- setting
- inking
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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
-
- 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 cylinders of an inking unit and a printing press.
- EP 1 249 346 B1 shows such a method and such a printing press.
- the sensor or the camera records the light reflected in a specific spectral range and, based on the measurements, optimizes the relative positions of cylinders involved in the printing process which delimit the cylinder gap.
- the disadvantages of this process is that it can also come to the production of waste during the employment, because first must be printed at not yet optimized cylinder positions in order to obtain measured values for the control of the relative positions of the cylinder.
- DE 102 1 1 870 A1 is concerned with offset printing machines in which ink and dampening solution is passed over a plurality of different cylinders until these raw materials of the offset printing process reach the printing plate cylinder and finally the printing material. Therefore, DE 102 1 1 870 A1 also proposes suspending a camera device in such an oscillating manner in an inking unit that the peripheral surfaces of various printing group cylinders can be inspected after a tilting of the camera apparatus.
- 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 present invention is to propose a method for adjusting the distances of cylinders involved in the printing process, which remedies this disadvantage.
- 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.
- a inking cylinder which may be an anilox roll or a smooth roll
- a printing plate cylinder which are used in high-pressure process
- An optical sensor is directed to the surface of one of the rollers, advantageously the inking roller.
- the light emitted from the roll surface light is measurable.
- 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.
- measured variables such as the spectral intensity of the remitted light change as a result of the contact.
- both cylinder gaps are delimited by the same cylinder on one of their sides and this cylinder has the largest tolerances on the peripheral surface of the cylinders involved.
- the setting of the first nip provides reliable Findings about the tolerances and the characteristics of the printing plate of the printing plate cylinder.
- 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 setting or presetting of the second gap takes place, is the cylinder gap or nip which is in the Color transport direction comes first. 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.
- 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 adjustment of the printing gap between the impression cylinder and the format cylinder can therefore take place as follows after the inking gap has been set in the course of a ramp drive and while the anilox roller and the format cylinder are employed as a roller set, while maintaining the optimized relative position, against the counter-pressure cylinder:
- the sensor On the anilox roller, the sensor records the intensity of the reflected light after a known time delay of the measuring effect.
- High-lying cliché areas which now in addition to the anilox roller contact also have contact with the impression cylinder, lead to the anilox roller to a different light intensity as low lying cliché areas, which have only one contact with the anilox roller and no contact with the impression cylinder.
- 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 brings together the control device with the previously determined height profile.
- the control device By comparing the contact image with the height profile, the control device, the additional required approximation of Determine Formatatzyl inder to the impression cylinder, so that this nip completely transfers color and not over-squeezed.
- 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. Further embodiments of the invention will become apparent from the description and the claims.
- Fig. 1 side view of a printing unit
- FIG. 4 shows a sketch of a first setting situation of the cylinders involved in the printing process of a flexographic printing unit
- FIG. 5 shows a sketch of a second setting situation of the cylinders involved in the printing process of a flexographic printing unit
- FIG. 6 shows a sketch of a third setting situation of the cylinders involved in the printing process of a flexographic printing unit
- FIG. 8 shows a detailed height profile of a surface section 25 of FIG.
- Fig. 10 A simplified height profile of the surface portion 25 of
- Fig. 1 1 The course of the intensity of the emitted light in a measurement along the line AA
- Fig. 12 The simplified height profile of Figure 10, wherein subsections
- FIG. 1 shows a functional sketch of an inking unit 1.
- the ink 2 needed 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 1 1.
- 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 counter-pressure cylinder rotates in the direction of the arrow 12. From FIG. 1, it is also clear that the cliché 8 largely gives off the ink film to the printing material during unrolling with the impression cylinder. 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 passing through the ink reservoir of the ink chamber doctor blade 3, makes contact with a surface portion of the format cylinder 6, ie with one of the two Clichés 7 and 8. This contact may already have resulted in a transfer of color, but it may also have been merely a change in the surface of the color film 4.
- the term "substantially color-free surface 13" does not mean that no more color film must be present on the relevant surface section of the anilox roller.
- the inking unit 1 causes a total transport of the color 2 in the Farbtransportides 14.
- 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 doctor blade 17 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.
- 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.
- Figures 4, 5 and 6 show the sequence in which the rollers of a flexographic printing unit 1 in the inventive manner can be employed against each other.
- anilox roller and format cylinder have already been employed 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.
- the three cylinders 5, 6, 9 of the flexographic inking unit 1 involved are already in their printing position.
- 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 show the time sequence of such a positioning process for the cylinders 5, 6 and 9 of a flexographic printing unit 1.
- a ramp ride 20 is performed.
- the cylinders 5, 6 delimiting a inking nip 19 rotate, and the cylinders 5, 6 are approached.
- Such a ramp ride 20 is shown in FIGS. 3 and 7.
- the vertical variable x On the vertical axis designated by the vertical variable x, the relative distance of the two cylinders 5 and 6 is shown. The approach may be gradual (as shown in Figure 7) or continuous (as shown in Figure 3).
- a sensor records the light remitted by the anilox roller. Depending on the approach and the local contact of the cylinders, 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.
- the roller spacing required for printing can be determined, in which the printing plate is completely in contact with the anilox roller, but is not over-squeezed.
- B 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 shows a stepwise ramp travel 20, in which an approximation between the cylinders 5, 6 is made in the sections 21 and in which no approach between the cylinders takes place in the sections 22.
- 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.
- 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 EP 238 489 2 A1 and PCT / EP201 1/057417 - whose disclosure content on this subject is indispensable for understanding the present document and is therefore included in the present document by this reference - show this method very precisely.
- 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. Such a detailed height profile is shown in FIG.
- 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 "height profile" (which is denoted by the radial coordinate r) along the line AA is also shown in Figure 9.
- the designation of the coordinate axes in this document (r, z and ⁇ ) corresponds to the common use of cylindrical coordinates with respect to the format cylinder 6th
- FIG. 10 shows the same section 25 of the surface of the format cylinder 6, the height profile 24 being 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 light remitted by the surface of the anilox roller 5 is removed, which results along the axial direction z.
- the first optical sensor 15 then records a reduced light intensity I in the area of the touch.
- FIG. 12 shows 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 Einärbespalt 19 there are significantly faster occurring measurable changes in the light intensity I of the reflected light in the first optical sensor 15.
- the roll distance between the format cylinder 6 and the impression cylinder 9 can be at least roughly adjusted so that subregions of the plate 7, 8 come into contact with the counter-pressure cylinder and other sub-range not.
- the control device has recorded and stored at least parts of the measurement results of the first optical sensor 15 together with the relative positions x of the respective rollers 5 and 6.
- 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).
- 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 and format cylinder 5 have had in the relevant measurement, the control device can determine by forming the difference with the final optimized Anstellposition B, which additional Beistellwert D was still necessary to adjust the Einärbespalts 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.
- 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 empirical and he should take into account that the surface properties of the impression cylinder 9 are of course different that 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.
- 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 again illustrates the time sequence between the setting of the inking ball 19 and the printing gap 18, since 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. LIST OF REFERENCE NUMBERS
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
Abstract
Description
Claims
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 true EP2776247A2 (en) | 2014-09-17 |
EP2776247B1 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 |
DE102021125382A1 (en) * | 2020-10-22 | 2022-04-28 | Heidelberger Druckmaschinen Aktiengesellschaft | Device for measuring a surface, or its elevations, a body of revolution and system |
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 |
DK3988307T3 (en) * | 2020-10-22 | 2023-06-19 | Heidelberger Druckmasch Ag | METHOD OF OPERATING A FLEXOGRAPHY MACHINE AND FLEXOGRAPHY MACHINE AND SYSTEM COMPRISING A FLEXOGRAPHY MACHINE AND A MEASURING DEVICE FOR MEASURING THE DOT DENSITY OF A FLEXOGRAPHY FORM OR SOCKET |
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 US US14/350,641 patent/US20140251169A1/en not_active Abandoned
- 2012-10-25 ES ES12779046.7T patent/ES2652035T3/en active Active
- 2012-10-25 EP EP12779046.7A patent/EP2776247B1/en not_active Not-in-force
- 2012-10-25 WO PCT/EP2012/071161 patent/WO2013068239A2/en active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2013068239A2 * |
Also Published As
Publication number | Publication date |
---|---|
EP2776247B1 (en) | 2017-10-25 |
DE102011086047A1 (en) | 2013-05-16 |
ES2652035T3 (en) | 2018-01-31 |
WO2013068239A3 (en) | 2013-08-15 |
WO2013068239A2 (en) | 2013-05-16 |
US20140251169A1 (en) | 2014-09-11 |
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