EP0060213B1 - Dispositif de marquage pour de différents signes - Google Patents

Dispositif de marquage pour de différents signes Download PDF

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Publication number
EP0060213B1
EP0060213B1 EP82730024A EP82730024A EP0060213B1 EP 0060213 B1 EP0060213 B1 EP 0060213B1 EP 82730024 A EP82730024 A EP 82730024A EP 82730024 A EP82730024 A EP 82730024A EP 0060213 B1 EP0060213 B1 EP 0060213B1
Authority
EP
European Patent Office
Prior art keywords
characters
stamping
embossing
bottom die
stamping device
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.)
Expired
Application number
EP82730024A
Other languages
German (de)
English (en)
Other versions
EP0060213A1 (fr
Inventor
Gottfried Weber
Heinz Blankenburg
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.)
GERHARD FLEMMING & HERMANN PEHRSSON GMBH
Original Assignee
Gerhard Flemming & Hermann Pehrsson 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
Application filed by Gerhard Flemming & Hermann Pehrsson GmbH filed Critical Gerhard Flemming & Hermann Pehrsson GmbH
Priority to AT82730024T priority Critical patent/ATE11247T1/de
Publication of EP0060213A1 publication Critical patent/EP0060213A1/fr
Application granted granted Critical
Publication of EP0060213B1 publication Critical patent/EP0060213B1/fr
Expired legal-status Critical Current

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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
    • 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
    • B44B5/0076—Machines or apparatus for embossing decorations or marks, e.g. embossing coins having a series of embossing tools each of which can be brought into working position

Definitions

  • the invention relates to an embossing device with the features of the preamble of claim 1, preferably for embossing character strings in chassis made of sheet steel of motor vehicles.
  • a corresponding device for embossing plastic films is known from DE-A No. 2555849.
  • this known device requires a pair of embossing wheels, on the peripheral surfaces of which there are raised characters or mirror-image depressions (matrices) around different characters to generate, the present invention is intended to simplify the tax expenditure for embossing character strings.
  • the invention has for its object to reduce the manufacturing and control effort for such an embossing device.
  • the embossing wheel with raised characters is assigned only a single fixed die on the circumferential surface, which either has an overlay of the images of all the characters of the embossing wheel as a recessed pattern or is resilient on its surface.
  • the manufacturing and control effort are the least.
  • An advantageous further development of the invention is also based on the object of improving the deformation in such an embossing device in such a way that, in addition to a sharp representation of the numbers, the die made of the elastic material has a long service life.
  • the inner shape of the characters (for example the inner surface of the number zero) should also be sharply defined.
  • Such an elastic universal die preferably consists of polyether-based polyurethane with a Shore hardness of essentially 95 as a homogeneous element embedded in a cutout.
  • the die is so thin that the flexibility is essentially exhausted when the letter edge is pronounced, the die preferably being molded into a metal bed in such a way that the elastic material is prevented from swelling by swelling.
  • a sandwich-like layering of soft types of plastic or rubber as a spring body with a covering wear layer of greater hardness does not withstand the comparatively large embossing forces.
  • the thin dimension of the die is in contrast to the dimensioning of rubber matrices for cutting work, where the layer thickness - when using polyurethane with a Shore hardness of approximately 80 - is more than five times the cutting template and the wear layer to be replaced alone is 15 to 20 mm thick having.
  • An approximately 2 mm thick polyurethane layer is used for embossing approximately 8 mm high characters in sheet steel (body sheet metal St 14.03 according to DIN 1623) with a thickness of 0.8 mm, whereby the cushion width only increases the letter dimensions by approx. 1 to 2.5 mm.
  • a longitudinally milled metal groove, into which the strip-shaped polyurethane material is glued, is preferably used for embossing rows of characters.
  • a synthetic resin adhesive (Macroplast UK 8202 with hardener UK 5400) is preferably used for this. By gluing, the possibility of the material to evade is further reduced. It is sufficient if the material is glued in the area of the ends.
  • the embossing tool must have a significantly different design when embossing with an elastic cushion than with hollow embossing with a metallic counter-shape. While when using a metal die, sharp bending edges with a bevel of about 5 to 10 ° favor the embossing process, when embossing with elastic cushions it is necessary to allow the material, which is initially only bulged or bulged, to flow freely. The outer edges of the to be engraved For this reason, signs should be rounded in the cross-section in the summit area - preferably semicircular or almost semicircular. The embossing process around the drawing area to be embossed allows material to slip towards the embossing point, which is favored by a low coefficient of friction of the elastic material.
  • the full letter depth is thus determined from the material thickness of the sheet.
  • the height of the embossing marks has been increased by 10 to 20% in relation to the embossing with a metallic matrix, since after the first bulging there must still be enough space within the elastic matrix for the final shaping of the symbols.
  • the embossing process itself takes place with particularly good results under dynamic loading of the embossing tool, and after the roller plunger has been struck, the force is limited so that the sheet is embossed well without causing cracks.
  • the limit is about 200 kN when embossing approx. 20 characters of 8 mm height in the body panel at the same time.
  • matrices can be combined in one line of characters according to the different design variants, whereby only the assignment of the embossing wheel - die is subject to restrictions, which are then irrelevant if there is a separate embossing wheel for each character position in a character set to be embossed.
  • the partial figures a and b represent a side view or top view of a die m which, in the form of depressions t, has a pattern which corresponds to an 8 of a known seven-segment display.
  • the partial figures c and d show a top view or side view of an associated stamping wheel p with characters in the form of numbers 0 to 9, which consist of segments in the form of elevations h.
  • these elevations h press material portions of the workpiece, which is located between the embossing wheel and the die, into the 8-shaped pattern of the die m.
  • This fixed die does not need to be moved relative to the embossing wheel because the pattern consisting of the depressions t fits all characters 0 to 9, since it corresponds to the superimposition of the mirror images of all characters from 0 to 9.
  • a plurality of embossing wheels p of the same size can also be arranged alongside one another, to which then only one according to the partial figures a (top view) and b (side view) Matrix m 'with several 8-shaped patterns belongs.
  • Using a single pattern in a matrix to emboss several different characters can result in the following difficulty: If the mirror image overlay of several characters results in a pattern of the matrix, the lines contained in the pattern become wider due to the overlay of several non-adjacent lines, than the indentations are otherwise (when adapting to only one character), such broad lines in the pattern result in blurred lines in the embossed character during embossing. It is therefore advisable to choose the shape of the characters and that of the pattern so that the lines contained in the pattern, which correspond to the superimposition of lines of several characters, are not significantly wider than in the case of a pattern that is only adapted to one character. This ensures that the lines of the pattern are not wider than required for a line of a character.
  • measures are provided to increase the security against forgery when using multi-segment arrangements.
  • measures are provided to increase the security against forgery when using multi-segment arrangements.
  • efforts are made to make such changes recognizable.
  • a subsequent change of an embossed number could consist of adding segments - changing a 0 to an 8 by adding the middle slash.
  • a character set is now designed by a corresponding selection or arrangement of the segments, that simply by adding segments or their parts, it is not possible to create another character of the agreed character set.
  • FIG. 3 such a character set secured against counterfeiting is shown in sub-figures a and b shown with a mirror image of an associated pattern m "for a die.
  • the characters 1 to 0 to be arranged on an embossing wheel of the partial figure a are designed such that within this first number of characters no complete character corresponds to only one part of another, a complete one
  • a set of digits, possibly supplemented by a number of letters, is used as the basis, and the character set according to FIG.
  • the protected characters are the digits shown in sub-figure a and the additional characters are letters from sub-figure b, the letters being designed, for example, by doubling the left vertical bar in such a way that segments are never added again can create a number (which, by agreement, must not have double lines).
  • impermissible attempts to convert digits from the character set b into digits from the character set a can also be made recognizable to those to whom the details of the complete character set are not known.
  • FIG. 3 In general, the principle underlying FIG. 3 can be characterized in that - in the embossed position - character parts of the embossing wheel of a second number of characters corresponding to FIG. 3b cannot be made to coincide with character parts of a third number corresponding to FIG. 3a, the mentioned. Character parts of the second number (Fig. 3b) are formed as parallel lines to character parts that also occur in the third number (Fig. 3a).
  • Fig. 3b a further distinction has been made between upper and lower case letters, in that the full left bar is represented by two parallel lines in the case of large letters, whereas in lower case letters this is only intended for the lower part of the bar.
  • This type of embossing also increases the legibility of the font, since confusion between numbers and letters, as is possible with simple segment arrangements, can be avoided.
  • FIG. 4a shows a further design option for characters, namely numbers 1 to 4, for which the associated pattern of the matrix m III is shown in FIG. 4b.
  • FIG. 5a the associated pattern of the matrix m IV being shown in FIG. 5b.
  • the symbols here consist of individual raised cones and the die accordingly contains the superimposition of all domes adapted to the pyramid shape, which are required for embossing the symbols on an embossing wheel.
  • the overlay takes the form of a dot matrix.
  • FIG. 6 shows yet another exemplary embodiment for three matrices m v lying next to one another in an arrangement corresponding to three embossing wheels lying next to one another in the axial direction.
  • the special feature of the matrices m v is that these are elastically resilient at least on the surface, so that the characters on the associated embossing wheels may be of any shape; special characters can also be embossed, for example Greek letters or mathematical characters.
  • the elastic material of the matrices m V is designed to be resilient but nevertheless so hard that the workpiece to be embossed is sufficiently pressed against the raised characters and their surroundings on the embossing wheel, so that the embossing process is sufficiently sharply defined and clearly delimited Embossed characters appear on the workpiece.
  • the matrix elements m Y shown in FIG. 6 are plastic parts which are inserted into depressions in a metal frame made of steel. They consist of a polyurethane based on polyether, as it is manufactured under the name Fibroflex rot by Fibro GmbH, D-6954 Hassmersheim.
  • the Shore hardness of the plastic material is preferably 95 and the thickness is approximately 2 mm if, with an embossing pressure of 20 and a character height of approximately 7 mm, the elevations forming the symbol are raised on the embossing wheel with a depth of approximately 0.6 mm.
  • the matrix is designed in one piece for several adjacent characters.
  • the resilience of the plastic elements is such that when a rounded body that corresponds to the punctiform or linear segment of the character to be embossed penetrates the workpiece - after initial embossing - such resistance that only the one directly with the embossing is opposed
  • the workpiece area coming into contact with the segment can move into the die due to the direct transfer of the contact pressure.
  • the die offers such great resistance that the entire workpiece deflects only to a small extent in the area surrounding the embossing segment. It is also of particular importance that the stamping stroke is carried out to such an extent that - after the raised stamping segment has penetrated the workpiece - the stamping wheel presses the workpiece completely against the surface of the die is so that the workpiece completely adapts to the embossing shape in the areas surrounding the raised areas of the sign and the raised and flat areas are created in the relation given by the embossed sign on the wheel.
  • FIG. 7 shows an elastic die designed as an embossing strip 1, the strip being inserted flush into a corresponding cutout in a steel carrier element 2.
  • the matrix is made of polyurethane.
  • the matrix is glued in an area 3.
  • the gluing reduces the flexing work of the material and thus reduces the risk of fibers shearing off the material at the edge of characters to be embossed.
  • the die has a very small thickness, so that the compression forces that arise after a certain bulging of the material are sufficient to sharpen the inner areas of characters so that the desired embossed sharpness is also achieved where parts of the letter form corners with each other.
  • the matrix serves as a counterpart for sequences of characters arranged side by side (or one above the other). A corresponding dimensioning also applies to the lateral protrusion of the die elements in relation to the arrangement shown in FIG. 6.
  • the height h of a character is related to the width b of the embossing strip, the strip being only slightly wider than the character high.
  • the overhang is a total of approx. 10 to 15%, the dimensioning being selected such that on the one hand the necessary pressure build-up in the material is maintained, but on the other hand the flexing work is not unnecessarily increased in the direction of premature wear of the die m VI .
  • the embossing tool 10 is shown in two positions with respect to a sheet to be embossed. In Fig. 9 it is located above the sheet 11 resting on the die m VI . The die in turn rests on the die carrier 2.
  • an element of an embossing mark 12 is visible in section on the embossing tool 10, the mark being raised by approximately 1.3 mm (dimension t).
  • the top area of the embossing element is rounded almost semicircularly, the flank parts forming an angle of approximately 25 ° to the vertical.
  • the rounded summit area 13 is polished so that the friction of the embossing sheet (during the deformation) is reduced.
  • the flanks of the embossing webs form an angle of essentially 25 ° to the vertical.
  • the sheet thickness d is 0.8 mm and the thickness D of the plastic die is 2 mm.
  • the edges of the characters beginning to show When the tool is first placed abruptly on the sheet metal surface, there is a slight deflection, the edges of the characters beginning to show. The tool is then moved with constant force in the direction of the die.
  • the sheet metal is preferably deformed by stretching the material in the deformation area, the material beginning to slide into the bulge that forms.
  • a sharp embossing of the edges of the embossing areas of the characters is due to the counter pressure building up.
  • the specified dimensioning according to the invention also sharpens the inner surfaces of characters.
  • the sheet bulges less overall than in static stamping.
  • the dynamic embossing principle is realized by hydraulic circuits based on the so-called Dynapark system. When a limit pressure is exceeded, a larger piston area is accelerated so that the roller ram strikes. For precise guidance, the sheet metal can be clamped beforehand using a hold-down frame the indentation of the characters is smaller with dynamic embossing.
  • the embossing device according to the invention can equally well be used both for embossing individual characters in succession with an embossing wheel and for simultaneously embossing a complete row of characters using a set of embossing wheels.
  • Electronic control is preferably used so that a high embossing frequency can be achieved.

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Claims (14)

1. Dispositif d'estampage pour estamper divers signes, comprenant au moins une roue d'estampage sur la surface périphérique de laquelle les signes à estamper sont formés en relief et à laquel le est associée une matrice, la roue d'estampage et la matrice étant disposées de manière à pouvoir être pressées contre la pièce, des deux côtés, en partant des côtés opposés de la pièce emboutissable qu'il s'agit d'identifier au moyen de signes, et avec la force nécessaire pour l'exécution de l'opération d'estampage, ce dispositif étant de préférence destiné à l'utilisation consistant à estamper des signes dans les tôles d'acier qui sont utilisées comme tôles de carrosserie ou de châssis de véhicules automobiles, et étant caractérisé en ce que la matrice (m à mVI) est réalisée de manière qu'au moyen de la roue d'estampage (t) on peut déformer, en les enfonçant dans le plan de la surface de la matrice, des régions de la pièce qui correspondent aux images superposées d'au moins deux signes de la même roue d'estampage (t) en surmontant une résistance qui détermine la déformation de la pièce.
2. Dispositif d'estampage selon la revendication 1, caractérisé en ce que la matrice (mV, mVI) est de constitution capable de céder automatiquement, au moins dans les régions de sa surface qui sont dirigées vers les signes à estamper portés par la roue d'estampage.
3. Dispositif d'estampage selon l'une des revendications 1 ou 2, caractérisé en ce que la matrice (m à m'v) présente un dessin creusé qui correspond aux images superposées d'au moins deux signes de la roue d'estampage (t).
4. Dispositif d'estampage selon la revendication 3, caractérisé en ce que le dessin correspond à un agencement à sept segments ou multiseg- ment ou à une matrice de points, tel que celui ou celle qui est connu(e) pour l'affichage variable de signes décimaux ou de signes alphanumériques, par exemple dans les afficheurs numériques.
5. Dispositif d'estampage selon l'une des revendications 3 ou 4, caractérisé en ce que, sur la roue d'estampage (p), dans un premier nombre de signes (fig. 3), aucun signe complet ne correspond à une partie seulement d'un autre.
6. Dispositif d'estampage selon la revendication 3, caractérisé en ce que la matrice (mV, mVI) est composée de polyuréthanne à base de polyéther d'une dureté Shore d'environ 95.
7. Dispositif d'estampage selon la revendication 6, caractérisé en ce que la matrice (mv, mVI) est d'une configuration suffisamment mince pour que la flexibilité soit sensiblement épuisée lorsque le bord du caractère est entièrement estampé.
8. Dispositif d'estampage selon l'une des revendications 6 ou 7, caractérisé en ce que la matrice (mV, mVI) est moulée dans un lit métallique de telle manière qu'on évite que la matière élastique ne se dérobe par écrasement.
9. Dispositif d'estampage selon la revendication 8, caractérisé en ce que la matrice (mVI) est assemblée par collage au lit métallique, au moins à ses extrémités (3) dans le cas d'une matière en forme de bande.
10. Dispositif d'estampage selon la revendication 3, caractérisé en ce que les régions en relief des signes à estamper sont arrondies en section avec une forme sensiblement semi-circulaire.
11. Dispositif d'estampage selon la revendication 3, caractérisé en ce que les régions sommitales (13) des parties en forme de barre sont d'une configuration arrondie, et que le rayon de l'arrondi est choisi de manière à correspondre sensiblement à la moitié de la différence entre la largeur de pied des parties en forme de barre et leur largeur mesurée au niveau de la région dans laquelle les flancs tangenteraient l'arrondi s'ils étaient de configuration rectiligne.
12. Dispositif d'estampage selon l'une des revendications 10 ou 11, caractérisé en ce qu'au moins les régions arrondies (13) sont polies.
13. Dispositif d'estampage selon la revendication 3, caractérisé en ce que les parties en relief en forme de barre des signes d'estampage s'amincissent avec une pente de flanc d'un angle d'environ 25° par rapport à la perpendiculaire au plan d'estampage.
14. Dispositif d'estampage selon la revendication 3, caractérisé en ce que l'opération d'estampage se produit dynamiquement avec limitation de l'effort.
EP82730024A 1981-03-05 1982-03-05 Dispositif de marquage pour de différents signes Expired EP0060213B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82730024T ATE11247T1 (de) 1981-03-05 1982-03-05 Praegevorrichtung fuer verschiedene zeichen.

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3109217 1981-03-05
DE3109217 1981-03-05
DE3139507 1981-09-30
DE19813139507 DE3139507A1 (de) 1981-03-05 1981-09-30 "praegevorrichtung fuer verschiedene zeichen"

Publications (2)

Publication Number Publication Date
EP0060213A1 EP0060213A1 (fr) 1982-09-15
EP0060213B1 true EP0060213B1 (fr) 1985-01-16

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82730024A Expired EP0060213B1 (fr) 1981-03-05 1982-03-05 Dispositif de marquage pour de différents signes

Country Status (2)

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EP (1) EP0060213B1 (fr)
DE (2) DE3139507A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2993058A1 (fr) * 2014-09-08 2016-03-09 Tscheulin-Rothal GmbH Dispositif et procédé de gaufrage partielle d'opercules
CN104647926B (zh) * 2015-01-22 2017-01-04 徐浩达 一种打码器数字轮

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2678015A (en) * 1950-05-25 1954-05-11 North American Aviation Inc Means for draw forming
GB946750A (en) * 1960-01-20 1964-01-15 Kenrick And Jefferson Ltd Improvements relating to numbering boxes
US3263791A (en) * 1965-02-17 1966-08-02 Dymo Industries Inc Multiple die group embossing arrangement for embossing machines
US3334504A (en) * 1965-05-25 1967-08-08 Saab Ab Cup-shaped diaphragm for hydraulic forming press
DE2134168B2 (de) * 1971-07-09 1977-02-17 Holzwerk Becker Kg, 6728 Germersheim Verfahren zum profilieren einer unter pressdruck formbaren materialbahn und pressbett zu dessen durchfuehrung
DE2146865C3 (de) * 1971-09-20 1974-11-14 Ergi Gmbh Fuer Rationalisierung In Der Graphischen Industrie, 6100 Darmstadt Pragevornchtung fur Kraftfahrzeugscb.il der
US3768619A (en) * 1971-12-29 1973-10-30 Addressograph Multigraph Direct image composing machine having means to prevent pressure overload of printing characters
CH547529A (de) * 1973-03-16 1974-03-29 Wirth Gallo & Co Abdruckvorrichtung an einem drucker.
SE379711B (fr) * 1974-02-04 1975-10-20 Wallmark O A E
US4004506A (en) * 1975-02-03 1977-01-25 Brandt-Pra, Inc. Endorser drum having indexable self-aligning print wheels

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Publication number Publication date
DE3261891D1 (en) 1985-02-28
EP0060213A1 (fr) 1982-09-15
DE3139507A1 (de) 1982-09-23

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