EP2718104A1 - Système d'impression d'une machine de rotogravure comprenant un bac à encre pivotant et procédé pour encrer et nettoyer un cylindre de rotogravure - Google Patents

Système d'impression d'une machine de rotogravure comprenant un bac à encre pivotant et procédé pour encrer et nettoyer un cylindre de rotogravure

Info

Publication number
EP2718104A1
EP2718104A1 EP12727635.0A EP12727635A EP2718104A1 EP 2718104 A1 EP2718104 A1 EP 2718104A1 EP 12727635 A EP12727635 A EP 12727635A EP 2718104 A1 EP2718104 A1 EP 2718104A1
Authority
EP
European Patent Office
Prior art keywords
ink
printing
printing unit
cylinder
unit according
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
EP12727635.0A
Other languages
German (de)
English (en)
Other versions
EP2718104B1 (fr
Inventor
Robert Niemöller
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from DE201210008775 external-priority patent/DE102012008775A1/de
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP2718104A1 publication Critical patent/EP2718104A1/fr
Application granted granted Critical
Publication of EP2718104B1 publication Critical patent/EP2718104B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/06—Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/06—Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders
    • B41F31/07—Troughs or like reservoirs with immersed or partly immersed, rollers or cylinders for rotogravure

Definitions

  • the invention relates to a printing unit of a gravure printing machine according to the preamble of patent claim 1 and a method for cleaning 15 color-leading parts of a printing unit of a gravure printing machine according to the preamble of patent claim 13.
  • a printing unit of a gravure printing machine comprises a gravure cylinder, which carries the print motif, so that the printing ink can be transferred format-wise to a printing material.
  • the printing material runs via a so-called impression roller, which can be adjusted to the gravure cylinder, which is displaceably mounted, for example, in the side walls of the machine frame.
  • the document US 3,896,730 discloses a system for cleaning a flexographic printing unit.
  • the ink used in the print job is pumped out of the ink tray via a front side arranged drain.
  • a cleaning fluid is now applied to a inking roller via the line system, via which ink is supplied in the printing operation.
  • a spray nozzle strip is provided with which pressurized cleaning fluid can be added to the inking roller. Since only one or more printing plates are inked in a printing roller which operates on the flexographic printing principle and these plates are removed from the printing drum when the printing job is finished, it is not necessary to clean the printing drum.
  • This process takes a relatively long time, so that time that could be used for production is lost.
  • the object of the present invention is therefore to propose an apparatus and a method with which the unproductive downtime required for cleaning can be shortened.
  • a printing unit includes, over which the ink can be removed.
  • the gutter may extend in the longitudinal direction of the ink pan, wherein the extension direction of the ink pan is parallel to the axis of the gravure cylinder.
  • the invention provides that the ink tray is pivotable at least so far that the ink is transferable into the gutter. The pivot axis of the ink tray should run parallel to the extension direction of the ink tray.
  • the ink can be removed via a connection piece.
  • the gutter can be greatly inclined in the direction of the connection piece, so that the ink flows quickly.
  • the pivot axis of the ink pan and the axis of rotation of the printing cylinder coincide or at least close to each other.
  • the ink tray is attached to holding elements, which in turn are attached to a ring, said ring being rotatable about the journal carrying the gravure cylinder.
  • side plates are provided, on which the ink pan or the color pan supporting pivot lever are supported, wherein the ink pan or the pivot lever are movable together with the ink pan relative to the side plates.
  • the elements necessary for pivoting the ink tray have no points of contact the printing cylinder or its attachments.
  • the printing cylinder can be conveniently removed from the printing unit, without having to first dismantle holding means for the ink tray.
  • the side plates comprise sliding elements or rolling elements and the ink pan or the pivot lever comprise recesses in which the sliding elements or rolling elements can be guided.
  • the rolling elements may be, for example, conventional rollers which revolve around pins which are fastened in the component to be guided.
  • the ink pan or the pivot levers comprise the sliding elements or the rolling elements.
  • the side plates comprise recesses in which the sliding elements or the rolling elements are feasible.
  • the recesses are circular arc-shaped and extend concentrically about the axis of rotation of the gravure cylinder. In this way it is ensured that the pivot axis of the ink pan coincides with the axis of rotation of the printing cylinder or that pivot axis and axis of rotation are close to each other. It is particularly advantageous if a force delivery element acts on the ink pan or the pivot levers to make a manual intervention for pivoting the ink pan unnecessary.
  • the power delivery element is a compressed air cylinder.
  • a particularly preferred embodiment of the invention includes that the side plates are displaceable relative to the machine frame.
  • suitable devices should be provided.
  • a preferred embodiment of this is disclosed in the instant specification.
  • a displacement of the side plates is advantageous if gravure cylinders of different diameters are to be used in the printing unit.
  • at least one lever arm which supports a inking roller is articulated in the side plates, by which means the inking roller can be set against the gravure cylinder.
  • a storage of the inking roller in a lever arm is particularly advantageous in the use of pressure rollers of different diameters.
  • the inking roller is partially surrounded by an enclosure, in which a fluid inlet nozzle is introduced.
  • a fluid inlet nozzle is introduced.
  • printing ink or a cleaning liquid can be introduced into the printing unit in a simple manner.
  • the ink tray comprises end walls, in which recesses are introduced. Through these recesses, the inking roller or at least its pin can reach through the end walls. This allows lever arms to be located outside the inkwell, but still allows the position of the inking roller to be adapted to the diameter of the impression cylinder.
  • a further component of the invention is a method for cleaning color-guiding parts of a printing unit of a gravure printing machine, wherein printing ink or a cleaning fluid are provided or collected in a paint trough and a gravure cylinder in the ink or the cleaning fluid is immersed.
  • the ink tray is pivoted so far that the printing ink or the cleaning fluid is transferred into the gutter enclosed by the ink tray.
  • washing cycle The printing cylinder is rotated at the maximum possible rotational speed. By immersing the printing cylinder in the cleaning fluid and the high speed of all ink-carrying parts of the printing unit are cleaned, the remains of the ink are greatly diluted by the cleaning fluid.
  • color-guiding parts are meant here those parts whose contact with the color is intended and necessary for the printing process. These include, for example, not splash guards or the like, which should only prevent excessive environmental contamination, but not necessarily required for the printing process.
  • Cleaning fluid is in turn added to the inking roller via the inlet nozzle of the housing.
  • the inking roller is held in touching contact with the pressure roller.
  • the peripheral speeds of the inking roller and the pressure roller may be slightly different, so that using the inking roller, the pressure roller is cleaned.
  • FIG. 1 Schematic view of a multi-color gravure printing machine
  • FIG. 2 detailed view of a printing unit according to the invention
  • FIG. 3 detailed view of a printing unit according to the invention, in which the
  • Fig. 4 shows another embodiment of an inventive
  • FIG. 1 shows a schematic view of a multi-color gravure printing machine 1, which is designed in the so-called post construction.
  • This gravure printing machine 1 shown by way of example is shown with four printing units D1 to D4.
  • a gravure printing press is not limited to this number of printing units.
  • Stand-mounted printing machines can even be expanded in a modular manner, so that a user of such a printing press can use as many printing stands as he wishes. In each individual printing unit, a printing ink is printed.
  • the material web 4 is fed to the printing machine. About different guide rollers 3, the material web 4 enters the printing unit D1. There, the material web 4 is guided over a impression roller P1. This impression roller P1 is adjustable in the direction of the double arrow y in its height position and thus adjustable to the gravure cylinder T1. In this case, the material web passes through the nip between the impression roller P1 and the gravure cylinder T1. The material web is now printed with the print motif of a printing ink. About further guide rollers 3, the material web 4 enters the printing unit D2. On the Way to the printing unit D2 passes through the web 4 a plurality of drying devices, not shown, so that the printed in the printing unit D1 printing ink can dry sufficiently.
  • the material web 4 After printing in the printing unit D2, the material web 4 in turn passes through further guide rollers 3 in the printing unit D3, where a third color can be printed.
  • the last illustrated printing unit D4 is not printed, that is, the impression roller P4 has been moved upwards, so that the material web does not touch the gravure cylinder T4. In this printing unit D4, for example, a cleaning of all ink-carrying parts can be made.
  • the web 4 passes through further guide rollers 3 to a preferred device 5, which comprises a tension roller 6 and a pressure roller 7. Finally, the material web 4 passes to a winding device 8, where it is wound up into a winding.
  • FIG. 2 now shows a detailed view of the printing unit D4.
  • This printing unit D4 initially comprises a machine frame 10, in which the gravure cylinder T4 is rotatably mounted in a manner not shown. Furthermore, a side plate 1 1 can be seen, which in the direction of the double arrow y 'in height is mobile.
  • a driven gear 12 is rotatably mounted in the machine frame 10, which meshes with the rack 13, which is attached to the side plate 1 1, meshes.
  • this height-adjustable side plate 1 1 it is possible to position the ink tray 14 so that gravure cylinder T4 different diameter always deep enough in the ink 15, which is absorbed by the ink tray 14, immerse.
  • two circular arc-shaped recesses 16, 17 are introduced, whose non-visible, hidden by the pivot lever 18 areas are shown with a dashed line.
  • two pins are attached, each extending into a recess.
  • Each pin carries a roller 19, which can roll on the edge of the recess 16, 17, respectively.
  • the pivot lever 18 - a pivot lever is provided at each end of the ink tray 14 - continue to wear on their inner sides support members 20, which may be configured, for example, as screws.
  • the ink tray 14 may simply be placed on these support members 20. However, it is also conceivable that the ink tray is locked by means not shown closure elements on the support members 20.
  • the pivot lever 18 has at one of its ends a semicircular course 21, with which the bearing 22 of the lever arm 23 is rebuilt in a simple manner.
  • a inking roller 24 is mounted, which rotates in the direction of arrow 25 in the rule.
  • the inking roller 24 is surrounded by a housing 26, which is also supported by the lever arm 23.
  • an inlet nozzle 27 is integrated, can be given to the inking roller 24 via the ink or a cleaning fluid.
  • the inking roller 24 can be set close to the printing cylinder T4, but without touching it. Above the resulting nip remains a majority of the ink or the cleaning fluid. However, a narrow film is taken through the nip by the gravure cylinder T4.
  • the inking roller 24 can also be employed on the printing cylinder.
  • the inking roller 24 pushes the cleaning fluid into the depressions (wells), so that as complete a cleaning of these depressions takes place.
  • the cleaning operation is also possible without the use of the inking roller.
  • a piston-cylinder unit 28 which is preferably operated with compressed air as a pressure medium.
  • the second end of the piston-cylinder unit 28 is rotatably mounted in the side plate 11 by bearings 31. It is advantageous to use a piston-cylinder unit which can be acted upon by the pressure medium for both directions of movement, so that always the shortest positioning times are achieved.
  • the piston-cylinder unit 28 is mounted so that the cylinder 29 engages the pivot lever 18 and the piston 30 engages the side plate. This avoids that if accidentally ink hits the piston-cylinder unit, the piston and the seals of the piston-cylinder unit are affected.
  • the piston-cylinder unit 28 is connected so that it holds the pivot lever 18 and thus the ink tray 14 in its operating position. In this operating position, the printing operation, but also the cleaning operation can take place.
  • FIG. 3 the same printing unit D4 is shown as in FIG. 2, but with the inkwell 14 pivoted away, which is thus in its emptying position.
  • the piston-cylinder unit 28 is switched accordingly.
  • the roller 19 has been moved by the pivoting movement to the other ends of the recesses 16, 17.
  • the pivoting movement takes place to such an extent that the ink can flow over the edge 32, which separates the trench 33 from the drainage channel 34, into the drainage channel 34 and finally into the outlet nozzle 35.
  • This emptying position is also adjusted when the ink tray 14 is to be emptied of a cleaning fluid.
  • Figures 4 and 5 show a further embodiment of a printing unit according to the invention, which has some differences from the printing unit of Figures 2 and 3.
  • the inking roller 24 and the related components have not been redrawn. Nevertheless, these components can be combined with the embodiment according to FIGS. 4 and 5.
  • the support element 45 rests on the bolt 40, the support element 46 on the bolt 41.
  • the shape of the support element 46 which includes a notch 47, which ensures that the support member 46 does not move relative to the bolt 41, as long as the lever arm 42 remains in its upper position.
  • the end wall 44 is formed in such a way that the pin 48 of the cylinder T4 can pierce it, which is ensured by a U-shaped recess 49.
  • the end wall 44 can be moved together with the ink tray in the vertical direction, but not in the horizontal direction.
  • a movement of the ink tray 14 in the horizontal direction comes about only by a pivoting movement, which will be described below.
  • the ink fountain 14 Due to the forces applied by this recess 49, the ink fountain 14 is always pivoted about the axis of rotation of the cylinder T4 or its pin 48, so that a collision between the cylinder T4 and ink tray is avoided.
  • the pin 48 and the recess 49 and the end wall need not be in direct contact with each other, but other components may be interposed. The focus is therefore on the operative connection between the end wall 44 and pin 48 to be addressed.
  • the piston-cylinder unit 28 which pivots the lever arm 42, is actuated to swivel the ink fountain 14.
  • the curved edge 50 of the support element 46 now slides along the bolt 41, which, moreover, can be configured as a slider or a roller, just like the bolt 40.
  • the support element 45 slides along the pin 40 a small distance, which explains the intended elongate extent of the support element 45, as can be seen in FIGS. 4 and 5.
  • the movement of the ink tray 14 is now so far that the color over the edge 32 can get away into the paint channel 34.

Landscapes

  • Rotary Presses (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

L'invention concerne le système d'impression d'une machine de rotogravure comprenant un cylindre de rotogravure avec lequel l'encre peut être transférée selon un format sur une matière à imprimer et un bac à encre disposé en dessous du cylindre de rotogravure dans lequel de l'encre peut être mise à disposition et dans lequel le cylindre de rotogravure peut être immergé. Il est à souligner que le bac à encre comporte une rigole d'écoulement et que le bac à encre peut pivoter au moins jusqu'à ce que l'encre puisse être transférée dans la rigole d'écoulement.
EP12727635.0A 2011-06-07 2012-06-06 Système d'impression d'une machine de rotogravure comprenant un bac à encre pivotant et procédé pour encrer et nettoyer un cylindre de rotogravure Active EP2718104B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102011077150 2011-06-07
DE201210008775 DE102012008775A1 (de) 2012-05-07 2012-05-07 Verfahren und Vorrichtung zur Reinigung der farbführenden Teile und des Formzylinders einer Tiefdruckmaschine
PCT/EP2012/060680 WO2012168290A1 (fr) 2011-06-07 2012-06-06 Système d'impression d'une machine de rotogravure comprenant un bac à encre pivotant et procédé pour encrer et nettoyer un cylindre de rotogravure

Publications (2)

Publication Number Publication Date
EP2718104A1 true EP2718104A1 (fr) 2014-04-16
EP2718104B1 EP2718104B1 (fr) 2015-06-03

Family

ID=46298393

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12727635.0A Active EP2718104B1 (fr) 2011-06-07 2012-06-06 Système d'impression d'une machine de rotogravure comprenant un bac à encre pivotant et procédé pour encrer et nettoyer un cylindre de rotogravure

Country Status (3)

Country Link
EP (1) EP2718104B1 (fr)
ES (1) ES2545657T3 (fr)
WO (1) WO2012168290A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9327494B1 (en) * 2015-04-23 2016-05-03 Eastman Kodak Company Flexographic printing system with pivoting ink pan
CN205185549U (zh) * 2015-11-13 2016-04-27 运城制版印刷机械制造有限公司 基于色彩管理操作***的凹版印刷设备

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2201452A (en) * 1937-09-11 1940-05-21 Goss Printing Press Co Ltd Intaglio printing mechanism
US2519229A (en) * 1944-11-27 1950-08-15 Goss Printing Press Co Ltd Printing press ink fountain
US3896730A (en) 1974-02-22 1975-07-29 Koppers Co Inc Wash-up system for flexographic printers
DE20118941U1 (de) * 2001-11-20 2002-02-14 MAN Roland Druckmaschinen AG, 63075 Offenbach Farbwerk für eine Rotationsdruckmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012168290A1 *

Also Published As

Publication number Publication date
EP2718104B1 (fr) 2015-06-03
ES2545657T3 (es) 2015-09-14
WO2012168290A1 (fr) 2012-12-13

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