EP2200824B1 - Tête de gravure pour la gravure de formes d'impression - Google Patents

Tête de gravure pour la gravure de formes d'impression Download PDF

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Publication number
EP2200824B1
EP2200824B1 EP08802227.2A EP08802227A EP2200824B1 EP 2200824 B1 EP2200824 B1 EP 2200824B1 EP 08802227 A EP08802227 A EP 08802227A EP 2200824 B1 EP2200824 B1 EP 2200824B1
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EP
European Patent Office
Prior art keywords
engraving
tool holder
drive shaft
engraving tool
head 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.)
Active
Application number
EP08802227.2A
Other languages
German (de)
English (en)
Other versions
EP2200824A1 (fr
Inventor
Dieter Fangmeyer
Jörg WOLTER
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.)
Hell Gravure Systems GmbH and Co KG
Original Assignee
Hell Gravure Systems GmbH and Co 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
Application filed by Hell Gravure Systems GmbH and Co KG filed Critical Hell Gravure Systems GmbH and Co KG
Publication of EP2200824A1 publication Critical patent/EP2200824A1/fr
Application granted granted Critical
Publication of EP2200824B1 publication Critical patent/EP2200824B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41C—PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTING SURFACES
    • B41C1/00—Forme preparation
    • B41C1/02—Engraving; Heads therefor
    • B41C1/04—Engraving; Heads therefor using heads controlled by an electric information signal
    • B41C1/045—Mechanical engraving heads

Definitions

  • the invention relates to an engraving head for engraving printing plates according to the preamble of patent claim 1.
  • An electronic engraving machine for engraving printing cylinders by means of an engraving element is already known.
  • the engraving element with an engraving stylus controlled by an engraving control signal as a cutting tool moves in the axial direction along a rotating impression cylinder.
  • the engraving stylus cuts a sequence of cells arranged in a printing grid in the lateral surface of the printing cylinder.
  • the engraving control signal is formed by superposition of a periodic screen signal for generating the print screen with image signal values which define the tonal values to be reproduced between "black” and "white”. While the raster signal causes an oscillating stroke movement of the engraving stylus to engrave the wells arranged in the printing raster, the image signal values determine the cutting depths of the engraved cells in accordance with the tone values to be reproduced.
  • an engraving element which essentially comprises a rotation system and an electromagnetic drive for the rotation system.
  • the turning system consists of a shaft, an armature, a bearing for the shaft, a return element and a damping device.
  • a lever-shaped stylus holder is attached, which carries the engraving stylus.
  • the electromagnetic drive for the rotary system has an exciting coil applied to the engraving control signal and a stationary permanent magnet in whose air gap the armature of the rotary system moves. The drive causes a small angle oscillating rotational movement of the shaft, and the stylus holder with the engraving stylus performs the engraving of the wells a corresponding oscillating stroke movement in the direction of the lateral surface of the printing cylinder.
  • the components of the engraving element are arranged with respect to the printing cylinder to be engraved such that the oscillating shaft of the rotating system is aligned approximately tangential to the printing cylinder and the lifting movement of Engierstichels takes place on a circular arc around this shaft.
  • Such a circular arc movement of the engraving stylus during its lifting movement is in principle also given when the shaft of the rotary system, as in the DE 199 52 996 A1 , Is stored substantially parallel to the longitudinal axis of the printing cylinder.
  • the pronounced curvilinear lifting movement of the engraving stylus in the known systems results in the engraving stylus not only substantially perpendicularly dipping into the printing plate surface in order to excavate a well or engraving a stroke, but also always, depending on the orientation of the shaft Sideways component or a pitch component has.
  • the engraving stylus penetrates obliquely into the printing plate surface, which falsifies the desired cup shape.
  • this additional movement component increases the risk of grave scuttles.
  • the known engraving heads which are operated in the region of a self-resonance of the engraving head, only maximum operating frequencies of about 4000 to 5000 Hz can be achieved. However, this limits the productivity of such an engraving system.
  • the US 1 785 883 A discloses a stylus holder in the form of an angled two-armed lever, in which the stylus is arranged at the free end of a lever arm, while the end of the other lever arm is fixed to the armature of a magnetic coil.
  • the magnetic coil pivots the stylus holder about an arranged between the lever arms pivot axis whose orientation is not specified in relation to the printing plate.
  • the stylus holder extends along its entire length between the pivot axis and its free end carrying the stylus along a pivot axis radius extending from the pivot axis approximately through the center of the lever arm to the free end.
  • the stylus Similar to the engraver holder from the DE 199 52 996 A1 the stylus performs a circular arc movement, so that its lifting movement depending on the orientation of the pivot axis has a sideways or pitch component, which leads to an oblique penetration of the stylus in the printing plate surface.
  • the EP 0 595 324 A1 revealed in Fig. 3 already includes parts of an engraving head, which comprises a mounted on a shaft of a vibration drive stylus holder for a engraving stylus.
  • the back of the Stichelhalters facing away from the stylus passes through the center of the shaft so that the stylus holder is disposed over its entire extension between the shaft and its free end bearing the engraving stylus on the side adjacent to the printing forme of a shaft radius passing through the free end of the stylus holder.
  • FIG JP 11-198334 A A similar stylus holder is shown in FIG JP 11-198334 A shown.
  • the invention has for its object to reduce the Stichelbruchgefahr and / or the Näpfchenformvertigschung in an engraving head of the type mentioned and preferably also to increase the productivity of an engraving stylus, in particular to operate the engraving stylus at a higher operating frequency.
  • This object is achieved in that substantially parallel to the shaft one of the printing plate is formed closer than the shaft arranged vibration axis.
  • the portion of a region preceding its free end carrying the engraving stylus is moved closer to the printing plate surface in the stylus holder so that this area of the stylus holder, which is important for the stroke movement of the engraving stylus, has a more tangential orientation to a cylindrical or a cylindrical one receives parallel orientation to a flat printing plate surface.
  • This shaping according to the invention allows the stylus holder to form a vibration axis or a vibration region which is displaced closer to the printing plate surface as a whole, thereby losing significance as a vibration center, in such a way that the more important region of the stylus holder is lost with the more tangential or parallel orientation to the printing plate surface performs the more essential for the engraving part of the vibration in itself.
  • a further development of the engraving head according to the invention which favors the above-described inventive effect, is characterized in that a root region of the engraver holder attached to the shaft is designed as a cantilever arm projecting in the direction of the printing form, to displace a portion of the stitch holder supported between the root portion and the engraving stylus with respect to the shaft radius through the free end of the stitch holder closer to the printing forme.
  • this embodiment of the invention provides by a shaping or arrangement of the Stichelhalters invention a division of the Stichelhalters into sections of which at least one important for the Hubzisverlauf the engraving stylus area of the Stichelhalters is moved closer and with a more favorable orientation to the printing plate surface or the Stichelhalter total or a section thereof is brought closer by an inventive arrangement closer and with a more favorable orientation to the printing plate surface and also allows a new approach to vibration of the kind described.
  • a further preferred embodiment of the engraving system according to the invention provides that the stylus holder has a curved or bent course when viewed in an axial direction of the shaft.
  • the course of the Stichelhalters has substantially an L- or J-shape, wherein preferably the shorter lower portion of this form forms the attached to the shaft root area.
  • Another possible embodiment according to the invention of the engraving system according to the invention provides that an intermediate piece is provided for the same purpose.
  • the Stichelhalter must then not necessarily have a special shape itself, but is oriented by its inventive arrangement wholly or partially cheaper.
  • the stylus holder is attached via a lever linkage to the shaft.
  • the engraving head according to the invention is characterized in that substantially parallel to the shaft, a vibration axis is arranged closer to the printing form than the shaft, which is achieved in particular by the previously described shaping and / or by a real additional axis, for example as part of a lever linkage can.
  • a further development of the engraving system according to the invention is characterized in that the stylus holder at least partially forms a resonance system following a natural resonance of the engraving head or at least a part of a resonance system following a natural resonance of the engraving head.
  • a further development of the invention is characterized in that, when viewed in a radial direction of the shaft, the stylus holder tapers towards its free end at least in a region between its root region attached to the shaft and its free end, wherein it is preferably whip-like , This also promotes a vibration behavior with a higher operating frequency, possibly also by a mass reduction.
  • the stylus holder could also or alternatively be made of aluminum, titanium, metal matrix composite, carbon fiber plastic, ceramic or the like, for example.
  • the axis or shaft could be made of hard metal.
  • At least one area of the Stichelhalters and / or at least a portion of an intermediate piece has a material weakening, which could in particular decouple the engraving stylus carrying section of the Stichelhalters more vibration from the shaft and a vibration behavior with a higher operating frequency and in particular could also favor a new inventive vibration approach. It can also be provided for this purpose leaf spring-like areas and / or storage elements or be designed as weakened areas.
  • At least one area of the stitch holder has a material cavity.
  • Another embodiment of the invention provides that the extension of the shaft and the extension of the Stichelhalters are oriented transversely to each other.
  • a preferred embodiment of the invention is characterized in that the extension of the shaft is aligned substantially parallel to the longitudinal axis of a cylindrical printing form, which, for example, similar to that in the cited DE 199 52 996 A1 could be achieved, but taking into account the inventive design and / or arrangement of the Stichelhalters. Embodiments from which further inventive features may result, to which the invention is not limited in scope, are shown in the drawing.
  • Fig. 1 shows a block diagram of an electronic engraving machine according to the prior art.
  • a printing form cylinder 1 is driven in rotation by a rotary drive 2.
  • An engraving element 3 with a engraving stylus 4 as a cutting tool is mounted on an engraving carriage 5, which is movable by means of a driven by a feed drive 6 spindle 7 in the axial direction of the plate cylinder 1.
  • the engraving element 3 is equipped, for example, with an electromagnetic drive for the engraving stylus 4.
  • Engraving stylus 4 controlled by an analog engraving control signal GS on a line 8, engravably cuts a sequence of cups and / or lines (intaglio) arranged in a printing grid in the lateral surface of the rotating printing plate cylinder 1, while the engraving carriage 5 engages the engraving element 3 for planar engraving moved stepwise or continuously in the axial direction of the printing form cylinder 1 along.
  • the engraving control signal GS is generated in an engraving amplifier 9 by overlaying a periodic screen signal R for generating the printing screen on a line 10 with image signal values B on a line 11, which define the tonal values of the cells to be engraved between "light" and depth R causes an oscillating lifting movement of the engraving stylus 4 to engrave the cups arranged in the printing grid, the image signal values B determine the depths of cut of the cells in accordance with the tonal values to be reproduced
  • the image signal values B are in a D / A converter 12 from engraving data GD of the printing form to be engraved
  • the engraving data GD are stored in an engraving data memory 13, from which they are read by the engraving line and supplied to the D / A converter 12 via a data bus 14.
  • the predetermined by the print grid engraving of the wells on the plate cylinder 1 are defined by the location coordinates x and y of the lateral surface of the plate cylinder 1 associated coordinate system whose X-axis in the axial direction and its Y-axis in the circumferential direction of the plate cylinder 1 are aligned.
  • the feed drive 6 generates the x-location coordinates and a mechanically coupled to the printing form cylinder 1 pulse generator 15, the y-location coordinates.
  • the x-y location coordinates are supplied via lines 16 to an engraving control unit 17.
  • the engraving control unit 17 generates the raster signal R on the line 10, read addresses for the gravure data memory 13 on an address bus 18 and signals for controlling and synchronizing the engraving process.
  • Fig. 2 shows a first basic embodiment of the engraving element 3 according to the invention with a respect to the center of the longitudinal axis of the shaft 20 mirror-symmetrical structure.
  • both ends of the shaft 20 as torsion bars 21 a, 21 b are formed, which are fixed in stationary clamps 28 a, 28 b.
  • An engraving holder 24 according to the invention with the engraving stylus 4 is attached to the shaft 20 at the center of the longitudinal axis.
  • two anchors 26a, 26b and two damping devices 23a, 23b are present.
  • the shaft 20 is still mounted in the center of its longitudinal axis in a shaft bearing 22, wherein the shaft bearing 22 is arranged for example in the region of the Stichelhalters 24.
  • the anchors 26a, 26b are located no further than about 25 mm from the engraving stylus holder 24 and define and thus define a unique resonant region of the stylus holder 24 with a new vibration lug.
  • torsion bars 21 a, 21 b also spoke storage, for example, according to the German utility model application G 298 12 163.8 , to replace.
  • the stylus holder 24 is in Fig. 2 but to see only in plan view, but has a principle bent shape, such as the Stichelhalter in Fig. 3 , He has to reduce material to a material cavity 19, which can also serve to receive the shaft bearing 22.
  • Fig. 3 shows a sectional view through a second embodiment of an engraving element 3 according to the invention and the printing form cylinder. 1
  • two opposing, U-shaped laminated cores 31 are arranged, which are arranged to each other, that between the poles forming air gaps 32 arise.
  • the armature 26b moves in front of a damping device 23b of the rotary system.
  • excitation windings 34 are mounted, of which only one coil side is shown. The excitation windings 34 are traversed by the engraving control signal GS.
  • Stichelhalter 24 is bent to an L-shape having leg portions 24b and 24c, wherein the leg portion 24b is disposed with its root portion 24a on the shaft 20. Due to the leg portion 24b, which projects from the shaft 20, the angle's kelabrough 24c is moved away from the shaft 20 and is flatter or tangential and also oriented closer to the printing plate 1. In particular, a large part of the Stichelhalters 24 from the radial direction to the shaft 20 29, corresponding to about the connecting line between Engierstichel 4 and shaft 20, moved out.
  • Fig. 4 shows a perspective view of a third embodiment of a Stichelhalters 24.
  • the Stichelhalter has substantially an L or J-shape, which appears rounded curved, while the L-shape of the Stichelhalters 24 in Fig. 3 folded appears.
  • an X is in the Fig. 4 indicated, where about the engraving stylus 4 is placed, however, on the viewer of the Fig. 4
  • the stylus holder 24 has a non-rotatable, rotationally secure bore 30 for correspondingly positive passage of a section of a shaft 20.
  • Fig. 5 shows a perspective view of a fourth embodiment of a Stichelhalters invention 24.
  • the stylus holder has a cantilever or an intermediate piece 24d, which radially from the shaft 20, for which again a passage 30 is provided, the wider portion 34 of the Stichelhalters 24 and in a brings flatter orientation to a printing plate, so that the engraving stylus 4 can penetrate more vertically into the printing plate.
  • the intermediate piece 24d has a material-weakened region 35, which is formed like a leaf spring, in order to decouple the region 34 of the Stichelhalters 24 from the region of the shaft 20 vibration technology.
  • further leaf spring elements 37 may be provided for an additional vibration bearing with a wave function for oscillation of the region 34. This also achieves a further decoupling of the shaft 20 and at the same time enables a high natural vibration frequency of the region 34 through a new oscillation approach.
  • the stylus holder 24 or 34 could also be arranged by means of a complicated lever linkage on the shaft 20 and moved away from this and decoupled, in particular by lever joints.
  • Both embodiments of the Stichelhalters in the 4 and 5 have a shape that tapers in its front view to its free end, substantially approximately triangular.
  • a rejuvenation could also be done in cross section.
  • the shape may be tongue or whip-like rejuvenate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)

Claims (13)

  1. Tête de gravure pour la gravure de formes d'impression, comportant un porte-burin (24) pour un burin de gravure (4), lequel porte-burin est monté sur un arbre d'entraînement (20) d'un entraînement à vibrations, le porte-burin (24) étant disposé, sur la plus grande partie de son étendue entre l'arbre d'entraînement (20) et son extrémité libre, du côté adjacent à la forme d'impression (1) d'un rayon d'arbre (29) passant par l'extrémité libre et étant de ce fait rapproché de la forme d'impression (1), caractérisée en ce qu'un axe de oscillation disposé plus près de la forme d'impression (1) que l'arbre d'entraînement (20) est réalisé essentiellement parallèlement à l'arbre d'entraînement (20).
  2. Tête de gravure selon la revendication 1, caractérisée en ce qu'une région de base (24a) du porte-burin (24) fixée à l'arbre d'entraînement (20) est réalisée sous forme de bras en porte-à-faux faisant saillie en direction de la forme d'impression (1), afin de rapprocher de la forme d'impression (1), par rapport au rayon d'arbre (29), une région (24c) du porte-burin (24) disposée entre la région de base (24a) et le burin de gravure (4).
  3. Tête de gravure selon l'une quelconque ou plusieurs des revendications précédentes, caractérisée en ce que le porte-burin (24), lorsqu'il est considéré dans une direction axiale de l'arbre d'entraînement (20), présente une allure courbe ou coudée.
  4. Tête de gravure selon la revendication 3, caractérisée en ce que l'allure du porte-burin (24) présente essentiellement une forme en L ou en J.
  5. Tête de gravure selon l'une quelconque ou plusieurs des revendications 1 à 3, caractérisée par une pièce intermédiaire (24d) prévue entre l'arbre d'entraînement (20) et le porte-burin (24) pour rapprocher le porte-burin (24) de la forme d'impression (1).
  6. Tête de gravure selon la revendication 5, caractérisée en ce que le porte-burin est fixé à l'arbre d'entraînement par le biais d'une tringlerie à levier.
  7. Tête de gravure selon l'une quelconque des revendications précédentes, caractérisée en ce que le porte-burin (24) forme au moins partiellement un système de résonance suivant une résonance propre accrue par rapport à une résonance fondamentale de la tête de gravure, ou forme au moins une partie d'un système de résonance suivant une résonance propre accrue par rapport à une résonance fondamentale de la tête de gravure.
  8. Tête de gravure selon l'une quelconque des revendications précédentes, caractérisée en ce que le porte-burin (24), lorsqu'il est considéré dans une direction radiale de l'arbre d'entraînement (20), se rétrécit en direction de son extrémité libre au moins dans une région (24c) entre une région de base (24a) fixée à l'arbre d'entraînement (20) et son extrémité libre.
  9. Tête de gravure selon la revendication 8, caractérisée en ce que le porte-burin est réalisé à la manière d'un fouet.
  10. Tête de gravure selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins une région du porte-burin (24) et/ou au moins une région d'une pièce intermédiaire (24d) prévue entre l'arbre d'entraînement (20) et le porte-burin (24) présente un affaiblissement de matière (35).
  11. Tête de gravure selon l'une quelconque des revendications précédentes, caractérisée en ce qu'au moins une région du porte-burin (24) présente un évidement de matière (19).
  12. Tête de gravure selon l'une quelconque des revendications précédentes, caractérisée en ce que le porte-burin (24) s'étend transversalement par rapport à l'arbre d'entraînement (20).
  13. Tête de gravure selon l'une quelconque des revendications précédentes, caractérisée en ce que l'arbre d'entraînement (20) est disposé parallèlement à l'axe longitudinal (27) d'une forme d'impression (1) cylindrique.
EP08802227.2A 2007-09-20 2008-09-16 Tête de gravure pour la gravure de formes d'impression Active EP2200824B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102007045098 2007-09-20
DE102007048668A DE102007048668B4 (de) 2007-09-20 2007-10-10 Gravierkopf zur Gravur von Druckformen
PCT/EP2008/007693 WO2009040013A1 (fr) 2007-09-20 2008-09-16 Tête de gravure pour la gravure de formes d'impression

Publications (2)

Publication Number Publication Date
EP2200824A1 EP2200824A1 (fr) 2010-06-30
EP2200824B1 true EP2200824B1 (fr) 2013-12-18

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08802227.2A Active EP2200824B1 (fr) 2007-09-20 2008-09-16 Tête de gravure pour la gravure de formes d'impression

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EP (1) EP2200824B1 (fr)
JP (1) JP2010538874A (fr)
DE (1) DE102007048668B4 (fr)
WO (1) WO2009040013A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012009532A1 (de) 2012-05-04 2013-11-07 Hell Gravure Systems Gmbh & Co. Kg Gravierorgan zur Gravur von Druckformen
WO2022181315A1 (fr) * 2021-02-26 2022-09-01 デクセリアルズ株式会社 Procédé de fabrication de matrice à rouleau, matrice à rouleau, objet transféré et matière imprimée
JP2022132020A (ja) * 2021-02-26 2022-09-07 デクセリアルズ株式会社 ロール金型製造方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1785883A (en) * 1928-07-04 1930-12-23 Teissere Albert Apparatus for engraving printing rollers
JPH0373343A (ja) * 1989-05-24 1991-03-28 Dainippon Printing Co Ltd グラビア電子彫刻装置
JPH06103643B2 (ja) * 1989-10-02 1994-12-14 株式会社日本リサジュー カード彫刻用カツタヘツド
JPH04166398A (ja) * 1990-10-30 1992-06-12 Nec Home Electron Ltd カード彫刻機のカッター駆動装置
JP2818525B2 (ja) * 1992-10-28 1998-10-30 大日本スクリーン製造株式会社 グラビア彫刻機のスタイラス変位調整装置
JP3424877B2 (ja) * 1995-07-10 2003-07-07 大日本スクリーン製造株式会社 彫刻ヘッドおよびその駆動装置
US5818605A (en) * 1996-08-19 1998-10-06 R.R. Donnelley & Sons Company Method and apparatus for high resolution sensing of engraving stylus movement
JPH11198334A (ja) 1998-01-16 1999-07-27 Dainippon Screen Mfg Co Ltd 彫刻ヘッド
DE29812163U1 (de) 1998-07-08 1998-10-08 Heidelberger Druckmaschinen Ag, 69115 Heidelberg Gravierorgan
DE19952996A1 (de) * 1999-11-04 2001-05-10 Heidelberger Druckmasch Ag Gravierorgan für elektronische Graviermaschine

Also Published As

Publication number Publication date
DE102007048668A1 (de) 2009-04-09
JP2010538874A (ja) 2010-12-16
WO2009040013A1 (fr) 2009-04-02
EP2200824A1 (fr) 2010-06-30
DE102007048668B4 (de) 2009-10-15

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