EP0906193A1 - Procede de production de plaques a gaufrer - Google Patents

Procede de production de plaques a gaufrer

Info

Publication number
EP0906193A1
EP0906193A1 EP97928209A EP97928209A EP0906193A1 EP 0906193 A1 EP0906193 A1 EP 0906193A1 EP 97928209 A EP97928209 A EP 97928209A EP 97928209 A EP97928209 A EP 97928209A EP 0906193 A1 EP0906193 A1 EP 0906193A1
Authority
EP
European Patent Office
Prior art keywords
engraving
tool
engraved
substructure
contour
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
EP97928209A
Other languages
German (de)
English (en)
Other versions
EP0906193B1 (fr
Inventor
Wittich Kaule
Karlheinz Mayer
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.)
Giesecke and Devrient GmbH
Original Assignee
Giesecke and Devrient GmbH
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=7797166&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0906193(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP0906193A1 publication Critical patent/EP0906193A1/fr
Application granted granted Critical
Publication of EP0906193B1 publication Critical patent/EP0906193B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44B—MACHINES, APPARATUS OR TOOLS FOR ARTISTIC WORK, e.g. FOR SCULPTURING, GUILLOCHING, CARVING, BRANDING, INLAYING
    • B44B5/00—Machines or apparatus for embossing decorations or marks, e.g. embossing coins
    • B44B5/02—Dies; Accessories
    • B44B5/026—Dies
    • 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
    • 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
    • B41C1/05—Heat-generating engraving heads, e.g. laser beam, electron beam
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30084—Milling with regulation of operation by templet, card, or other replaceable information supply
    • Y10T409/30112—Process
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/30084—Milling with regulation of operation by templet, card, or other replaceable information supply
    • Y10T409/301176—Reproducing means
    • Y10T409/301624—Duplicating means
    • Y10T409/30168—Duplicating means with means for operation without manual intervention
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00—Gear cutting, milling, or planing
    • Y10T409/30—Milling
    • Y10T409/303752—Process
    • Y10T409/303808—Process including infeeding

Definitions

  • the invention relates to a method for producing embossed plates, in particular steel gravure plates, according to the preamble of claim 1.
  • embossing plates in particular steel intaglio printing plates, as are usually used in the printing of high-quality printed products such as securities, banknotes or the like
  • embossing plates produced by an artist in a complex process.
  • an image motif available to the artist is converted into a line pattern, with differently wide, deep and different numbers of lines per area representing the gray levels of the original image.
  • the artist inserts this motif into the metal plate, such as steel or copper, in time-consuming manual work.
  • the plates produced in this way are characterized by their high quality with regard to their use in gravure printing. However, the possibilities of correction for the artist when manufacturing the plate are extremely small. If this original plate is damaged or lost, an identical plate cannot be produced, since each plate is individually made.
  • the steel gravure is characterized by the fact that a continuous line print pattern, which can be felt with the application of ink, is transferred to the print carrier, which is characterized in particular by its filigree lines.
  • the object of the invention is accordingly to propose a method with which a simple and automated production of embossing plates, in particular steel intaglio printing plates, is possible.
  • the invention is based on the knowledge that it is possible to treat a two-dimensional line template graphically in such a way that the present lines are interpreted as surfaces. These areas are each delimited by edges, these edges defining a desired structure of the area.
  • a tool path is now determined, along which an engraving tool can be guided so that material is removed within the area which is delimited by the target contour.
  • the engraving tool is controlled so that the material within the target contour is removed in the form of continuous or broken lines in a certain depth profile. This depth profile can be determined by a constant or variable depth value within the target contour.
  • a data processing system is preferably used in the method according to the invention, with the aid of which it is possible to record, save and further process two-dimensional line templates.
  • the two-dimensional line template which is generated, for example, in a computer or read in via input devices, can be processed further with the aid of a suitable computer program in such a way that data for controlling an engraving tool are available along a tool path.
  • a surface element is defined in a first work step from the two-dimensional line template, which consists, for example, in a single line of the line template.
  • the edge surrounding the line then defines a target contour that is free of crossings.
  • a depth profile is assigned to the interior of the surface element as the target depth for the engraving and then a tool path is calculated from the target contour data and the assigned target depth, along which the engraving tool is guided and removes material within the surface element.
  • This procedure is then repeated for each individual surface element to be engraved, so that a tool path of the engraving tool for the entire surface to be engraved, which is composed of the sum of the individual surface elements to be engraved, can be determined.
  • the speed for producing the embossing plate can be increased considerably.
  • the method also offers simple correction options by changing the line drawing data.
  • the exact reproducibility of the engraving to be introduced also means that printing plates can also be produced directly without having to resort to a galvanic impression process.
  • Several engraving tools can also engrave several plates at the same time.
  • several optionally different engraving tools can be controlled so that they process a plate at the same time, so that the processing time is optimized.
  • FIG. 6 shows a schematic cross section through an embossing plate, 7/48555 PC17EP97 / 03120
  • FIG. 11 shows a schematic cross section through an embossing plate.
  • the method according to the invention is based on a two-dimensional line template 1, which consists of a simple black line 2 on a light background 3 to represent the principle according to the invention.
  • the template z. B. is available on paper, can be digitally recorded in a computer with the aid of a scanner or other suitable data input means.
  • guilloche lines or other graphic elements could be generated with the aid of implemented programs, the interactive input or specification of data is just as possible as the calculation of the structures with the aid of random algorithms.
  • line template 1 defines a surface, for example surface 4, that represents a partial surface of the plate.
  • a target contour 5 is defined by the edge of this surface and serves as the first of two elements as the starting point for the later calculation of a tool path along which the embossing plate is engraved shall be.
  • the assignment of a depth profile within the target contour is required, which is referred to as a so-called target depth. This can, for example, be specified constantly for the entire engraving. It can also depend on the shape of the engraving tool used.
  • a tool path 10 lying within the surface 4 is then calculated, along which the engraving tool must be moved so that the engraving corresponding to the line drawing can be introduced into the embossing plate. Since different engraving tools can be used to engrave the plate, it is clear that data of the respective engraving tool are also included in the calculation of the tool path. For example, when using a laser beam, the width of the beam which acts on the embossing plate can be included in the calculation. When using a mechanical stylus, the stylus shape and here in particular the shape of the tip or its radius of curvature are of essential importance when calculating the tool path.
  • the engraving tool is controlled in such a way that it moves within the area 4, does not violate the desired contour 5 during engraving and removes the area 4 at the predetermined desired depth 6.
  • the number “7” is generated as a line template on a sheet of paper and read into a computer with the aid of a scanner.
  • the number “7” exists, as in FIG. 2a shown from lines 7.
  • 7 areas 8 are defined from the present lines, the edges of which form the desired contours 9. These serve as Starting point for the calculation of a tool path.
  • tool paths 10, 11 and 12 can be determined along which the engraving tool is controlled over the embossing plate, so that the line drawing is transferred into the embossing plate can be.
  • These tool paths are exemplarily shown in Fig. 2 (c).
  • the tool paths 10, 11 and 12 are preferably determined in such a way that the tool is guided along the desired contours 9 within the surfaces 8 without thereby violating the desired contours.
  • the line drawings can be used to define surface elements with a size that can no longer be removed completely if the engraving tool is only guided along the desired contour lines.
  • a very simple form of the line drawing is shown as an example in FIG. 3.
  • a line element 8, which has a contour line 9, is defined by the line drawing in FIG. 3 (a). If the tool path 13, as shown in FIG. 3 (b), is now calculated on the basis of this predetermined data, then depending on the dimensioning of the surface 8 and the shape of the engraving tool, the engraving tool can remove the surface to be removed during one revolution not completely removed.
  • FIG. 4 For a rotating 14 stylus, these relationships are shown in perspective in FIG. 4.
  • the stylus 14 rotates about its own axis z and, after penetrating into the embossing plate 15, removes material from the embossing plate along the tool path 13 at a predetermined depth.
  • the target contour line 9 remains unharmed. Because of the limited width of the stylus, however, a residual surface 16 of the surface 8 to be removed can be in one revolution of the Engraving tool can not be removed. Only in a further work step can the remaining surface 16 be removed with the aid of a second predetermined tool path, which can differ in shape from the first tool path 13.
  • the remaining surface 16 can be removed accordingly with the aid of tool paths which run parallel to the contour, ie that have the same distance to the contour line in every point.
  • a tool path was calculated from the contour line 9, along which the engraving tool was guided and an engraving line 28 was generated which includes a remaining surface 16 which is still to be engraved .
  • an engraving line 28 was generated which includes a remaining surface 16 which is still to be engraved .
  • any one, but preferably one of the ones, can already be removed procedures described above can be applied.
  • a defined roughness structure is generated at the base of the engraving of the remaining surface, which is determined by the offset and the shape of the engraving tool.
  • Such a roughness structure is shown in FIG. 6 (b), wherein a pointed, rotating gravers was used during the engraving, with which the embossing plate was removed at a defined depth T.
  • the stylus used had a diameter D at the exit surface from the embossing plate and was displaced inward by the amount d / 2 when the remaining surface was removed, while the offset in the example 3 ⁇ d shown in FIG. 6 (c) is.
  • the engraving tool was moved in accordance with the tool paths shown in FIG. 5 (c).
  • the surface structuring described at the base of the embossing has several advantages in the production of steel gravure plates. Because with the use of steel intaglio printing plates, only limited line widths have so far been printable, which is due to the fact that the steel intaglio printing ink can only be introduced into engravings of the plate which have a certain maximum width. However, this obstacle is eliminated by the newly proposed engraving, since the roughness can now be set as a basic pattern at the base of the engraving, which can serve as a color catcher for a steel intaglio printing ink. This color can thus also be held in very wide engraving lines, so that it is now possible for the first time to also print wide lines using the steel gravure printing process. As shown in Figs.
  • the roughness of the bottom can be controlled by the size of the offset of the engraving tool. Since different offset widths of the stylus can also be taken into account when calculating the tool path, the roughness can be designed differently in different areas of the remaining surface and thus can be superimposed with an engraving line or surface with an additional modulation of the roughness of the basic pattern, so that it is also possible to introduce further information into an engraving line solely by the specific production of the roughness of the basic pattern.
  • the different engravings in a line on the document to be printed can be used to correspondingly produce a different color impression within a line.
  • This impression of color can be further improved in particular if the engraving which has already been created is provided with a second engraving in a further method step, the desired depth of which has a different definition than that of the first engraving.
  • FIG. 7 (a) An example is shown in which there is a line drawing 18 which has lines 19.
  • the lines 19 are delimited by target contour lines 20.
  • Surfaces 21 lie within the lines 19, which in turn are delimited by second nominal contour lines 22.
  • This line template is in turn introduced as a digital data image into a computer or generated directly in this. As shown in a detail in FIG.
  • a tool path 23 is calculated from the contour lines 20 together with a target depth which is in this case fixedly predetermined, along which a first engraving takes place. Any remaining area that has remained is, as already described above, removed in a predetermined target depth.
  • the surface 21 lying within the line drawing 19 is converted in the same way into a tool path 24, the contour of the surface 21 and a second desired depth which is different from the first being included in the determination of the tool path as the basis for the implementation. In this way, engravings can be produced which also contain additional information about a larger area, which can also be transferred to the document when the steel intaglio printing method is used.
  • the tapered edges of the line drawing 19 can be represented exactly by a suitable choice of the stylus shape.
  • the depth profile can also be adapted to the requirements of the surface 19 to be engraved.
  • the depth profile is specified so that the engraving tool removes less material at the tapered edges, so that especially when using a rotating mechanical stylus, the stylus always comes out of the material to be processed and, due to its conical shape, the removed material Line becomes narrower.
  • a determined target contour is generally combined with an engraving depth profile in accordance with the method according to the invention, so that a tool path is determined from these two data, along which the engraving tool is guided, so that the material accordingly the line drawing can be removed in the depth corresponding to the depth profile.
  • the depth profile that is to say the target depth
  • target depths for individual engraving lines or parts of engraving lines can be different, so that the respective tool path is modulated accordingly.
  • rotating mechanical styluses it is particularly advantageous to use different stylus tips. zen, shapes and sizes to use, so that optimal embossing plates can be produced in this way.
  • the embossing result can be influenced in a variety of ways. This is because the shape and size of the embossing tool, depending on the depth of penetration of the engraving tool into the plate, determine the shape of the engraved cross-sectional area produced therewith.
  • 9 shows two examples of possible cross-sectional areas of stylus tips. 9a the stylus tip is shaped such that the cutting line 28 of the conical surface forms an angle of 45 ° to the rotational symmetry axis S of the engraving tool. As a result, when the plate is engraved with this tool, an engraving path is created, the side walls of which likewise run towards the base of the engraving at an angle of 45 °.
  • the production of engraving tools with different angles can produce different wall inclinations in the engraving plate.
  • the shape of the engraving tool can also be used to influence the shape of the wall.
  • the cross-sectional line 29 of a rotationally symmetrical engraving tip is shown in FIG. 9b, with the aid of which different degrees of angle of the engraving walls can be produced at different engraving depths. From these two examples it can be seen that the use of different engraving tools has a considerable influence on the desired engraving result or that optimal results can be achieved with the aid of specially manufactured engraving tools or engraving tool tips for a specific line template.
  • the engraving tools in their angulation and shape in such a way that even very fine surfaces to be engraved can be removed, with the tool path along which the engraving tool is guided being only once within the surface to be removed in the case of fine lines is guided along the predetermined line. Due to the special shape of the engraving tool, the material within the target contour is removed by a single working path of the engraving stylus. In these cases, the tool path can also run along a center line that lies between two nominal contour lines and is at the same distance from both. With a given depth profile, a suitable stylus shape must then be selected.
  • the method according to the invention offers the decisive advantage that the engraving can be carried out exactly with exact lines even with extremely small engraving areas or lines.
  • the target depths that can be achieved in the method according to the invention are preferably between 10 and 150 ⁇ m, the target depths also being able to be predetermined by different gray values of the line template.
  • the template is formed, for example, from a uniform line pattern, for example a guilloche, then by varying the line depth, line width, line density or the contour according to the method described above, visible information, such as a portrait, can be introduced. Instead of the visually recognizable information, however, another, e.g. B. bring machine-readable information in this way.
  • a uniform line pattern for example a guilloche
  • the method according to the invention can of course also be used ⁇ be applied to the flanks of the engraving along the target contours modify.
  • An example of this is shown in FIG. 10, an engraving being introduced into an embossing plate 15, which in the present case consists of a flank 28 and an engraving 29 lying on the bottom.
  • additional information in the form of so-called sub- or microstructure lines 30 was introduced into the flank 28.
  • the flank of the engraving line can thus be provided with an additional information content which can consist, for example, of simple lines, a staircase function, characters, patterns, images or the like.
  • an additional information content can consist, for example, of simple lines, a staircase function, characters, patterns, images or the like.
  • the method according to the invention can also be used if a negative image of the line template is to be generated.
  • the calculation of the tool path already described can also be carried out if there is a further surface area 25 within the surface to be removed, which area is to be removed from the removal.
  • the tool path is preferably calculated so that the engraving tool is the workpiece, i. H. So the stamping plate, in a first step, moves so that the stamping plate is removed along the desired contour line 26.
  • the engraving tool is guided along the second target contour 27, while any remaining surface that may still exist between the target contours 26 and 27 is cleared out, as already described above.

Abstract

L'invention concerne un procédé de production de plaques à gaufrer, notamment de plaques pour impression en creux en acier. A cet effet, un élément de surface est obtenu à partir d'un dessin linéaire, le bord de l'élément de surface définissant un contour théorique (9). A partir dudit contour théorique et d'une profondeur théorique associée à l'élément de surface, une trajectoire d'outil (12, 17, 18, 19, 20) est ensuite calculée, sur la base de laquelle un outil de gravure est guidé de manière que la surface partielle puisse être enlevée.
EP97928209A 1996-06-17 1997-06-16 Procede de production de plaques a gaufrer Expired - Lifetime EP0906193B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19624131 1996-06-17
DE19624131A DE19624131A1 (de) 1996-06-17 1996-06-17 Verfahren zur Herstellung von Prägeplatten
PCT/EP1997/003120 WO1997048555A1 (fr) 1996-06-17 1997-06-16 Procede de production de plaques a gaufrer

Publications (2)

Publication Number Publication Date
EP0906193A1 true EP0906193A1 (fr) 1999-04-07
EP0906193B1 EP0906193B1 (fr) 2001-10-04

Family

ID=7797166

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97928209A Expired - Lifetime EP0906193B1 (fr) 1996-06-17 1997-06-16 Procede de production de plaques a gaufrer

Country Status (16)

Country Link
US (1) US6840721B2 (fr)
EP (1) EP0906193B1 (fr)
JP (1) JP2000512231A (fr)
AR (1) AR007596A1 (fr)
AT (1) ATE206356T1 (fr)
AU (1) AU3259297A (fr)
BG (1) BG64251B1 (fr)
CA (1) CA2258663C (fr)
DE (2) DE19624131A1 (fr)
ES (1) ES2165066T3 (fr)
PL (1) PL186295B1 (fr)
PT (1) PT906193E (fr)
RU (1) RU2183558C2 (fr)
UA (1) UA46854C2 (fr)
WO (1) WO1997048555A1 (fr)
ZA (1) ZA975252B (fr)

Cited By (2)

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WO2002020268A1 (fr) * 2000-09-08 2002-03-14 Giesecke & Devrient Gmbh Support de donnees en heliogravure et procedes de transposition de motifs d'images dans des structures lineaires ainsi que dans une plaque helio
EP4098769A2 (fr) 2021-06-02 2022-12-07 Giesecke+Devrient Currency Technology GmbH Plaque d'impression en taille douce à durée de conservation étendue et son procédé de fabrication

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JP5394071B2 (ja) 2006-01-23 2014-01-22 ディジマーク コーポレイション 物理的な物品で有用な方法
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RU2183558C2 (ru) 2002-06-20
DE59704798D1 (de) 2001-11-08
PL186295B1 (pl) 2003-12-31
ATE206356T1 (de) 2001-10-15
BG64251B1 (bg) 2004-07-30
BG103049A (en) 1999-07-30
DE19624131A1 (de) 1997-12-18
ZA975252B (en) 1998-01-05
ES2165066T3 (es) 2002-03-01
PT906193E (pt) 2002-02-28
AR007596A1 (es) 1999-11-10
US6840721B2 (en) 2005-01-11
US20010043842A1 (en) 2001-11-22
AU3259297A (en) 1998-01-07
EP0906193B1 (fr) 2001-10-04
PL330529A1 (en) 1999-05-24
CA2258663C (fr) 2007-10-23
UA46854C2 (uk) 2002-06-17
CA2258663A1 (fr) 1997-12-24
JP2000512231A (ja) 2000-09-19
WO1997048555A1 (fr) 1997-12-24

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