EP1562753B1 - Stamp plate unit and self-inking stamp - Google Patents

Description

The invention relates to a stamp plate unit with a stamp plate carrier made of a first plastic material and with an applied on the Stempelplattenträger, provided for coloring stamp plate from at least a second compared to the first soft plastic material, and a self-inking stamp with a turning mechanism.

From the US Pat. No. 5,809,886 a self-inking stamp with a turning mechanism is known in which different stamping plates can be used modularly via a pin / hole connector in the stamp plate carrier. However, the production of such a connector is relatively time consuming.

From the WO 02/058937 A1 Furthermore, a self-inking stamp with a turning mechanism is known in which stamp types can be fastened by means of a plug connection to a type aggregate. For this purpose, the type unit has recesses in which plug-in projections of the stamp types can be used.

For fixing a stamp plate on a stamp plate carrier, it is common practice to use a double-sided adhesive tape, with which the comparatively soft, made of rubber or plastic stamp plate on the stamp plate carrier, which consists of relatively hard plastic material, is adhered. The disadvantage here is that the bonding is extremely time consuming and costly.

Accordingly, it is an object of the present invention to provide a stamp plate unit and a self-inking stamp of the type mentioned, the stamp plate unit compared to the previously known stamp plate units comparatively inexpensive and also can be produced quickly and easily.

This is achieved in the stamp plate unit according to the invention of the type mentioned in the fact that the punch plate carrier and the stamp plate are integrally formed as a multi-component injection molded part.

The material properties with regard to strength and material resistance required for the stamp plate carrier are in particular met when polyoxymethylene (POM) is provided as the first plastic material, POM also being used for processing by means of a multi-component injection molding method suitable is. Of course, however, other suitable for a multi-component injection molding process materials such as acrylonitrile-butadiene-styrene copolymers (ABS), polypropylene (PP), polyamide (PA), polycarbonates (PC) or PC / ABS can be used.

In the selection of the soft plastic material for the stamp plate in addition to the condition that this is suitable for a multi-component injection molding process, in particular the wettability and the impression quality must be taken into account, it has proved to be particularly advantageous if the second plastic material of the Stamping plate has a Shore hardness A of substantially 50 to 60. Tests have shown that the abovementioned criteria with regard to wettability, print quality and also the ease of production by means of a multi-component injection molding process are fulfilled, in particular if a thermoplastic elastomer (TPE) is provided as the second plastic material.

To make the stamp image of the stamp plate at least partially variable by individual stamp symbols can be releasably inserted into the stamp plate, it is advantageous if the stamp plate for inserting stamp symbols at least partially has a groove or web structure. This design ensures a secure hold of stamp symbols used in the stamp plate. In addition, the insertion or removal of the stamp symbols can be done in a simple manner.

With regard to a simple cost-effective production and easy attachment of the stamp symbols on the stamp plate, it is advantageous if the groove or web structure has at least one groove or a web with a rectangular, in particular square, cross-section. Alternatively, it is also possible that the groove or web structure has at least one groove or a web with a trapezoidal, rhomboid or comparable cross section, wherein the interlinked webs and grooves thus have cross-sections engaging behind each other, which reliably provide a firm connection between the stamp symbols and the stamp plate.

The self-inking stamp according to the invention of the type mentioned is characterized in that a stamp plate unit is provided according to one of claims 1 to 8. By providing a stamp plate unit according to one of claims 1 to 8, in connection with the self-inking stamp, the advantages already mentioned above for the stamp plate unit result, so that reference is made to the above statements in order to avoid repetition.

• Fig. 1a eine auseinandergezogene, perspektivische Ansicht einer Stempelplatten-Einheit mit einer runden Stempelfläche gemäß Stand der Technik;
• Fig. 1b eine perspektivische Ansicht einer erfindungsgemäßen Stempelplatten-Einheit mit einer runden Stempelplatte, die in einem Mehrkomponenten-Spritzguss-Verfahren hergestellt wurde;
• Fig. 2a eine auseinandergezogene, perspektivische Ansicht einer Stempelplatten-Einheit gemäß Stand der Technik mit einer rechteckigen Stempelplatte und einer mittigen Ausnehmung;
• Fig. 2b eine perspektivische Ansicht einer erfindungsgemäßen Stempelplatten-Einheit mit einer rechteckigen Stempelplatte mit einer mittigen Ausnehmung, die mittels eines Mehrkomponenten-Spritzguss-Verfahrens hergestellt wurde;
• Fig. 3 eine perspektivische Ansicht eines Selbstfärbestempels mit einem Wendemechanismus und einer mittels eines Mehrkomponenten-Spritzguss-Verfahrens hergestellten Stempelplatten-Einheit.

The invention will be explained below with reference to preferred embodiments shown in the drawings, to which, however, it should not be limited. In detail, in the drawing:

• Fig. 1a an exploded perspective view of a stamp plate unit with a round stamp surface according to the prior art;
• Fig. 1b a perspective view of a stamp plate unit according to the invention with a round stamp plate, which was prepared in a multi-component injection molding process;
• Fig. 2a an exploded perspective view of a stamp plate unit according to the prior art with a rectangular stamp plate and a central recess;
• Fig. 2b a perspective view of a stamp plate unit according to the invention with a rectangular stamp plate with a central recess, which was prepared by means of a multi-component injection molding process;
• Fig. 3 a perspective view of a self-inking stamp with a turning mechanism and a produced by a multi-component injection molding process stamp plate unit.

In the FIGS. 1a and 2a are each shown in an exploded view of the individual components of stamp plate units according to the prior art, which consists of a rubber or rubber stamp plate 1, a punch plate carrier 2 and a double-sided adhesive film 3, by means of the rubber or rubber stamping plate 1 on the Stamp carrier 2 is adhered, have.

In the Figures 1b and 2b On the other hand, stamp plate units 4 are shown, which consist of a single piece and were produced in a two-component injection molding process. The stamp plate carrier 2 in this case consists of a relatively hard thermoplastic material, such as POM, which is for one-piece production in one Two-component injection molding process with a softer, elastomeric plastic material of the stamp plate 1 is suitable. By producing in a single piece thus eliminating the sticking of the stamp plate 1 by means of an adhesive film 3, so that by manufacturing in a two-component injection molding process a cost-effective and at the same time all placed on the stamp plate unit 4 requirements for strength of Stempelplatten.trägers 2 and wettability or impression quality of the stamp plate 1 fulfilling arrangement is achieved.

In Fig. 3 is a perspective view of a self-inking stamp 5 with a housing 5 'and to the housing 5' against the force of a spring (not shown) slidably arranged bracket 5 "shown in which the in Fig. 1b shown stamp plate unit 4 is pivotally mounted. In the housing 5 'also impregnated with a stamp ink stamp pad 6 is added for coloring the stamp plate 1. In order to realize an automatic turning mechanism, guide pins 7 of the stamp plate unit 4 (see FIG. Fig. 1b ) is received in a groove guide 8 of the housing 5 ', so that the punch plate unit 4 performs a turning movement upon displacement of the bracket 5' to the housing 5 '.

Moreover, in Fig. 3 it can be seen that the stamp plate 1 has grooves 9 in which stamp symbols 10 can be used with webs 11 corresponding to the grooves 9, so that a variable stamp image results. The stamp symbols 10 can in this case be inserted in a simple manner into the grooves 9 of the stamp plate 1, which are essentially dovetail-shaped in cross-section, by means of tweezers 12 and can also be removed again.

This results in a stamp plate unit 4 produced in a two-component injection molding process, which can be produced inexpensively in a single production step and is therefore particularly suitable for large quantities. Due to the provided for receiving stamp symbols 10 grooves 9 but at the same time an individual variable stamp image can be achieved.

Of course, the stamp plate, apart from the illustrated rectangular or round shape, any other, for example, oval, square shape and also contain any recesses.

Claims (8)

1. A stamp plate unit (4) comprising a stamp plate carrier (2) made of a first plastic material, and a stamp plate (1) which is applied to the stamp plate carrier (2) and provided for inking and made of at least one second plastic material that is soft compared to the first plastic material, characterized in that the stamp plate carrier (2) and the stamp plate (1) are made in one piece as a multicomponent injection molded part.
2. The stamp plate unit according to claim 1, characterized in that polyoxymethylene (POM), acrylonitrile-butadiene-styrene copolymers (ABS), polypropylene (PP), polyamide (PA), polycarbonate (PC) or PC/ABS is provided as the first plastic material.
3. The stamp plate unit according to claim 1 or 2, characterized in that the second plastic material of the stamp plate (1) has a Shore A hardness of substantially 50 to 60.
4. The stamp plate unit according to any one of claims 1 to 3, characterized in that a thermoplastic elastomer (TPE) is provided as the second plastic material.
5. The stamp plate unit according to any one of claims 1 to 4, characterized in that the stamp plate (1) at least in parts thereof has a groove or web structure for insertion of stamp symbols (10).
6. The stamp plate unit according to claim 5, characterized in that the groove or web structure comprises at least one groove (9) or web having a rectangular, in particular a square, cross-section.
7. The stamp plate unit according to claim 5, characterized in that the groove or web structure comprises at least one groove (9) or web having a trapezoidal, rhomboidal or comparable cross-section.
8. A self-inking stamp (5) with a turning mechanism, characterized in that a stamp plate unit (4) according to any one of claims 1 to 7 is provided.

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