EP2085223A1 - Verfahren zur positionseinstellung von druckerkörpern in flexodruckmaschinen - Google Patents

Verfahren zur positionseinstellung von druckerkörpern in flexodruckmaschinen Download PDF

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Publication number
EP2085223A1
EP2085223A1 EP07823011A EP07823011A EP2085223A1 EP 2085223 A1 EP2085223 A1 EP 2085223A1 EP 07823011 A EP07823011 A EP 07823011A EP 07823011 A EP07823011 A EP 07823011A EP 2085223 A1 EP2085223 A1 EP 2085223A1
Authority
EP
European Patent Office
Prior art keywords
printing
roller
linear
printing roller
positions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP07823011A
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English (en)
French (fr)
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EP2085223A4 (de
EP2085223B1 (de
Inventor
Felip Ferrer Cadillach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Comexi Group Industries SA
Original Assignee
Comexi Group Industries SA
Comexi SA
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Publication date
Application filed by Comexi Group Industries SA, Comexi SA filed Critical Comexi Group Industries SA
Publication of EP2085223A1 publication Critical patent/EP2085223A1/de
Publication of EP2085223A4 publication Critical patent/EP2085223A4/de
Application granted granted Critical
Publication of EP2085223B1 publication Critical patent/EP2085223B1/de
Expired - Fee Related legal-status Critical Current
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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
    • B41F13/26—Arrangement of cylinder bearings
    • B41F13/30—Bearings mounted on sliding supports
    • 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 present invention generally relates to a method for positional adjustment of printing bodies in flexographic printing machines, applicable to flexographic printing machines with a series of linear motors for moving each of the rollers of the printing units, and particularly to a method of reading the embossment of printing plates assembled on printing rollers.
  • Flexographic printing machines using linear motors for moving the different rollers forming the printing units thereof to the printing position are known.
  • Said machines have positioning systems, for the purpose of specifying as much as possible the printing position to be taken by the rollers in order to ensure sufficient pressure to print but not causing damage of the printing plate by pressing excessively against the support drum.
  • Proposals relating to performing the mentioned positional adjustment by means of detecting different linear towards/away positions taken by a printing roller with respect to the support drum when contact with one or the other area of a printing plate, or directly with the bare surface of the printing roller, occurs, are not known.
  • the present invention provides a method for positional adjustment of printing bodies in flexographic printing machines with a rotating support drum on which there is supported a sheet material to be printed, and a series of printing rollers each of which carrying one or more printing plates, and each associated to a respective inking roller, belonging to respective printing units, arranged around said support drum and spaced out along its perimeter, said printing rollers and inking rollers being coupled to respective guide arrangements, through mobile supports which can be operated by respective linear motors for moving each of said rollers, linearly and independently, in a towards/away direction with respect to said support drum, said method comprising, starting from initial positions in which there is no contact between the printing rollers and the support drum, nor between the inking rollers and the printing rollers, sequentially performing the following steps:
  • the method comprises carrying out said step a) by means of applying a corresponding power supply to said linear motor and maintaining, at least during said steps c) and d), the power supply of the linear motor with sufficient minimum intensity to overcome the frictional resistance on the guide arrangements and in a direction corresponding to the towards movement, but allowing the towards-away movement of the first printing roller with respect to the support drum without damaging the printing plate or printing plates assembled on the first printing roller.
  • Said away position occurs because the mobile support of the first printing roller is allowed to move away backwards in the event of collision of the printing plate with the support drum or, where appropriate, with the sheet material carried by the support drum, after a position of the first printing roller closer to the support drum, generally contacting with the bare surface of the first printing roller.
  • the method comprises carrying out said step d) to perform said detections of the linear towards/away positions of the first printing roller in correspondence with the angular positions thereof (detected by means of corresponding angular position detectors), thus obtaining a substantial representation of the embossment of at least said printing plate assembled on the first printing roller with respect to the angular positions thereof, and hence of the outer embossment of the first printing roller if it rotates a complete turn in step c).
  • At least one linear away position is detected in said step d) whenever a printing plate carried by the printing roller contacts with the support drum, and at least one towards position is detected whenever said contact of the printing plate with the support drum does not exist, at which time it is generally the bare outer surface of the printing roller which contacts with the support drum, although for a case in which the printing plate extends over virtually the entire circumferential outline of the printing roller, the outer surface of the printing roller may not contact with the support drum in the towards position.
  • the method comprises detecting a series of intermediate towards/away positions for different areas of contact of the printing plate with the sheet material for the case of a printing plate with an irregular embossment, it being possible to ascertain said irregular embossment by means of the relationship of said detected positions with the angular positions of the printing roller on which the printing plate is assembled.
  • the present invention relates to a method for positional adjustment of the printing bodies in flexographic printing machines such as that illustrated in Figure 1 , with a rotating support drum 1 on which there is supported a sheet material 2 to be printed, and a series of printing rollers 5-8 each of which carrying one or more printing plates Cl 1 (see Figures 2a , 3a and 4a ), and each associated to a respective inking roller 9-12, belonging to respective printing units, arranged around said support drum 1 and spaced out along its perimeter, said printing rollers 5-8 and inking rollers 9-12 being coupled to respective guide arrangements 17, through mobile supports 18a, 18b which can be operated by respective linear motors M1-M8, at least one per roller, for moving each of said rollers 5-12, linearly and independently, in a towards/away direction with respect to said support drum 1.
  • the method comprises, starting from initial positions in which there is no contact between the printing rollers 5-8 and the support drum 1, nor between the inking rollers 9-12 and the printing rollers 5-8, sequentially performing the following steps:
  • Said step c) generally comprises rotating the first printing roller 5 a complete turn.
  • the method comprises performing step a) by means of a corresponding power supply of the linear motor M1, and maintaining the power supply with sufficient minimum intensity to cause said movement, overcoming the resistance of the guide arrangements 17 (see Figure 1 ), but allowing a backward away movement in the event of a collision with the support drum 1.
  • Figure 2a shows the first printing roller 5 in three different positions with respect to the support drum 1:
  • Figure 2b shows by means of a graph the different linear positions, in this case in correspondence with the angular positions, of the first printing roller 5 along a complete turn, including said positions A, B and C.
  • the section going from B to C is different from the rest of the graph; this is because in said section what contacts with the support drum 1 is the bare surface of the printing roller 5, whereas in the rest of the graph the contact occurs through the printing plate Cl 1.
  • the method comprises, after said step d), performing the following steps:
  • any of the positions included in sections A-B and C-A corresponding to the away position are those considered in step f) as the position to be reached by the first printing roller 5.
  • step f i.e., to ascertain the position to be reached by the first printing roller 5, it is not necessary to detect angular positions nor is it necessary therefore to relate them with the linear positions (unlike the embodiment shown in Figure 2b ), since it is only required to detect the linear position taken by the first printing roller 5 when the printing plate contacts with the sheet material 2.
  • the method comprises recording said positions detected in step d) prior to said analysis of the variations experienced by them, or after such analysis.
  • step d) The mentioned detection of linear positions of step d) is performed through the reading of one or more linear position detectors (not shown) associated to each roller, the levels of the graph shown in Figure 2b (as well as those shown in Figures 3b and 4b ) corresponding to the values of, for example, voltage supplied by one of said linear position detectors associated to the first printing roller 5, which will have one or another value depending on the thickness of printing plate Cl 1 , which causes a movement away from the support drum 1 to a greater or lesser extent.
  • the angular positions are also detected by means of one or more corresponding angular position detectors associated to each roller, showing the readings made with one of said angular position detectors associated to the first printing roller 5, represented in degrees in Figures 2b , 3b and 4b , corresponding to certain voltage values supplied by the detector.
  • the method comprises using two linear motors per roller, one at each end, whereby it is possible to move each end of each roller independently by means of corresponding independent regulations of each of said two motors or, for another embodiment making the two linear motors operate in a synchronized manner.
  • the method proposed by the invention is applied to the positional adjustment of a printing roller carrying a printing plate with at least two differentiated areas or carrying at least two printing plates Cl 1 , Cl 2 arranged in two differentiated areas, spaced out at least longitudinally, as occurs in the first printing roller 5 shown in Figure 3a .
  • the method comprises performing steps a), b), c) and d) simultaneously or sequentially at the two ends of the first printing roller 5 through the two corresponding linear motors, and
  • the first printing roller 5 carries two printing plates Cl 1 , Cl 2 , each in an area close to one of the two ends movable by two respective linear motors, and the graphs shown in Figure 3b have been obtained by means of, as mentioned, performing steps a) to d) simultaneously or sequentially at the two ends of the first printing roller 5 through the two mentioned corresponding linear motors, having carried out step d) to perform the detections of the linear towards/away positions of each of the two ends of the first printing roller 5 in correspondence with the angular positions thereof.
  • the upper graph of Figure 3b is representative of the movement indicated as X1 in Figure 3a when, respectively, a first printing plate Cl 1 located in a first of said two areas close to the ends contacts with the sheet material 2 supported on the support drum 1 and when the bare outer surface of the printing roller 5 comprised by said first area does so directly
  • the lower graph of Figure 3b is representative of the movement indicated as X2 in Figure 3a , when a second printing plate Cl 2 located in a second of said two areas contacts with the sheet material 2 supported on the support drum 1 and when the bare outer surface of the printing roller 5 comprised by said second area does so directly.
  • Both graphs of Figure 3b represent the positions of the first printing roller 5 farthest away from the support drum 1, with a level greater than that of the towards positions. Also, the same references X1, X2 have been used to indicate both the directions of the linear movements of both end areas of the first printing roller 5, and to name the signal resulting from the readings taken by means of respective linear position detectors, each of them arranged in each of the two areas close to the ends of the first printing roller 5.
  • steps a) to d) have also been performed at the two ends of the first printing roller 5 through the two mentioned corresponding linear motors, also having carried out step d) to perform the detections of the linear towards/away positions of each of the two ends of the first printing roller 5 in correspondence with the angular positions thereof.
  • the upper graph of Figure 4b only shows a variation of linear positions, i.e., for X1, whereas in the lower part, i.e., X2, there is no positional discrepancy, simply showing the position in which the bare surface of the area close to the end of the first roller not carrying the printing plate contacts with the sheet material 2 supported on the support drum 1.
  • the proposed method comprises, for the present embodiment, performing an alternative step to the mentioned step f), comprising considering, out of the positions detected in step d), only the linear position farthest away from the support drum 1 of the end of the first printing roller 5 where the printing plate Cl 1 is close to, as substantially the position to be reached by both ends of the first printing roller 5 in future operations of the machine.
  • the illustrated embodiments only refer to the application of the method on a printing roller, specifically the first printing roller 5, the method proposed by the present invention can also be applied to the inking rollers 9-12, to which end it comprises, before or after said steps a) to f), sequentially performing the following steps:
  • the proposed method comprises carrying out said movement of said step g) by means of the power supply of a corresponding linear motor M5 associated to said first inking roller 9, and maintaining, at least during said steps i) and j), the power supply of said linear motor M5 with sufficient minimum intensity to overcome the frictional resistance on the guide arrangements 17, allowing the towards-away movement of the first inking roller 9 with respect to the printing roller 5.
  • the method comprises carrying out said step j) to perform said detections of the relative linear towards/away positions between the first two rollers 5, 9 in correspondence with the angular positions of the first printing roller 5, to obtain a substantial representation of the embossment of at least said printing plate Cl 1 assembled on the first printing roller 5 with respect to the angular positions thereof.
  • said automatic detection of said step b) and/or of said step h) comprises analyzing the variations in consumption of said linear motor or motors M1, M5.
  • said automatic detection of said step b) and/or of said step h) comprises maintaining the linear motor M1, M5 in current regulation, with a minimum intensity to overcome the resistance of the guide arrangements 17, and starting an initial movement and detecting the collision by the stop of the movement at constant intensity.
  • the method has been explained for the first printing roller 5 and for the first inking roller 9, it has been done in such a manner for the purpose of simplifying the explanation, since the method comprises performing all the steps for the remaining printing rollers 6-8 and/or inking rollers 10-12 in the same way as for said first printing roller 5 and/or inking roller 9.
  • the method comprises performing all the steps for all the printing rollers 5-8 simultaneously, and for another embodiment performing all the steps for all the inking rollers 9-12 also simultaneously.
  • the proposed method comprises using the results of said step d) or of step j) to calculate the development of said printing plate or plates Cl 1 , Cl 2 for different purposes, one of which consists of consulting said calculated printing plate development in a data structure relating known developments of printing plates with other features or formats associated to said known developments, such as the thickness of the adhesive plus that of the printing plate, the radius of the liners, etc.
  • Knowing the development of the printing plate according to the proposed method offers several advantages, such as enabling a more precise control of the linear motors, increasing the power supply voltage only when necessary, i.e., when the printing plate Cl 1 contacts with the sheet material 2 wrapped around the support drum 1 and therefore proceeds to print, and maintaining it at a lower level when the part facing the sheet material 2 is the bare outer surface of the printing roller.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP07823011A 2006-11-22 2007-10-25 Verfahren zur positionseinstellung von druckerkörpern in flexodruckmaschinen Expired - Fee Related EP2085223B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ES200602981A ES2300209B1 (es) 2006-11-22 2006-11-22 Metodo de ajuste posicional de cuerpos impresores en maquinas impresoras flexograficas.
PCT/ES2007/000604 WO2008062080A1 (es) 2006-11-22 2007-10-25 Método de ajuste posicional de cuerpos impresores en máquinas impresoras flexoqráficas

Publications (3)

Publication Number Publication Date
EP2085223A1 true EP2085223A1 (de) 2009-08-05
EP2085223A4 EP2085223A4 (de) 2009-11-18
EP2085223B1 EP2085223B1 (de) 2012-02-22

Family

ID=39400677

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07823011A Expired - Fee Related EP2085223B1 (de) 2006-11-22 2007-10-25 Verfahren zur positionseinstellung von druckerkörpern in flexodruckmaschinen

Country Status (4)

Country Link
EP (1) EP2085223B1 (de)
BR (1) BRPI0716008A2 (de)
ES (2) ES2300209B1 (de)
WO (1) WO2008062080A1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2460658A1 (de) 2010-12-06 2012-06-06 Flexotecnica S.p.A. Verfahren zur Einstellung einer Position von Druckkörpern in flexografischen Druckmaschinen
WO2013164132A1 (de) * 2012-05-02 2013-11-07 Windmöller & Hölscher Kg Verfahren für die parallele ausrichtung von wenigstens zwei zylindern zueinander
ITVR20130064A1 (it) * 2013-03-12 2014-09-13 Expert S R L Metodo di posizionamento dei cilindri di un gruppo di stampa in una macchina da stampa flessografica o rotativa
WO2015001126A1 (de) * 2013-07-05 2015-01-08 Windmöller & Hölscher Kg Verfahren und vorrichtung zum gegenseitigen anstellen von zwei zylindern in einer druckmaschine
IT202100021335A1 (it) 2021-08-05 2023-02-05 Expert S R L Metodo per determinare la posizione di un rullo di stampa in una macchina per la stampa flessografica

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2395183B1 (es) 2011-08-12 2013-11-28 Comexi Group Industries, Sau Método para ajuste de presiones en una máquina impresora flexográfica y máquina impresora flexográfica para su implementación.
ES2395184B1 (es) 2011-08-12 2013-11-28 Comexi Group Industries, Sau Método de ajuste de presiones en una impresora flexográfica y máquina flexográfica para su implementación.

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792658A (en) * 1971-02-19 1974-02-19 Colodense Ltd Rotary printing machine with stop members for cylinder adjustments
US4587901A (en) * 1983-07-29 1986-05-13 Officine Meccaniche G. Cerutti S.P.A. Plate holding roller particularly for flexographic printing applications
US4896600A (en) * 1987-12-11 1990-01-30 Windmoller & Holscher Printing machine
US6634297B2 (en) * 2001-03-27 2003-10-21 Windmoeller & Hoelscher Kg Device and process for setting the printed image in a flexographic press
US6796226B2 (en) * 2001-03-22 2004-09-28 Fischer & Krecke Gmbh & Co. Printing method

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4121749A1 (de) * 1991-07-01 1993-01-07 Windmoeller & Hoelscher Verfahren zur steuerung des andrucks der formzylinder von druckwerken einer druckmaschine
ES2127050B1 (es) * 1995-04-28 1999-11-16 Neopack S L Dispositivo para el accionamiento y posicionado automatico de los rodillos en maquinas de impresion y flexografica.
DE102004008090A1 (de) * 2004-02-19 2005-09-08 Man Roland Druckmaschinen Ag Vorrichtung zum Positionieren einer Walze in einem Farb- oder Feuchtwerk einer Rotationsdruckmaschine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3792658A (en) * 1971-02-19 1974-02-19 Colodense Ltd Rotary printing machine with stop members for cylinder adjustments
US4587901A (en) * 1983-07-29 1986-05-13 Officine Meccaniche G. Cerutti S.P.A. Plate holding roller particularly for flexographic printing applications
US4896600A (en) * 1987-12-11 1990-01-30 Windmoller & Holscher Printing machine
US6796226B2 (en) * 2001-03-22 2004-09-28 Fischer & Krecke Gmbh & Co. Printing method
US6634297B2 (en) * 2001-03-27 2003-10-21 Windmoeller & Hoelscher Kg Device and process for setting the printed image in a flexographic press

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008062080A1 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2460658A1 (de) 2010-12-06 2012-06-06 Flexotecnica S.p.A. Verfahren zur Einstellung einer Position von Druckkörpern in flexografischen Druckmaschinen
ITRE20100093A1 (it) * 2010-12-06 2012-06-07 Flexotecnica S P A Metodo per il settaggio del posizionamento di corpi di stampa in macchine per la stampa flessografica
WO2013164132A1 (de) * 2012-05-02 2013-11-07 Windmöller & Hölscher Kg Verfahren für die parallele ausrichtung von wenigstens zwei zylindern zueinander
US10081084B2 (en) 2012-05-02 2018-09-25 Windmöller & Hölscher Kg Method for aligning at least two cylinders in a parallel manner relative to each other
ITVR20130064A1 (it) * 2013-03-12 2014-09-13 Expert S R L Metodo di posizionamento dei cilindri di un gruppo di stampa in una macchina da stampa flessografica o rotativa
WO2015001126A1 (de) * 2013-07-05 2015-01-08 Windmöller & Hölscher Kg Verfahren und vorrichtung zum gegenseitigen anstellen von zwei zylindern in einer druckmaschine
IT202100021335A1 (it) 2021-08-05 2023-02-05 Expert S R L Metodo per determinare la posizione di un rullo di stampa in una macchina per la stampa flessografica

Also Published As

Publication number Publication date
BRPI0716008A2 (pt) 2014-05-20
EP2085223A4 (de) 2009-11-18
ES2300209A1 (es) 2008-06-01
ES2300209B1 (es) 2009-05-01
WO2008062080A1 (es) 2008-05-29
ES2381762T3 (es) 2012-05-31
EP2085223B1 (de) 2012-02-22

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