EP1663646B1 - Screen printing doctor blade and device for screen printing - Google Patents

Screen printing doctor blade and device for screen printing Download PDF

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Publication number
EP1663646B1
EP1663646B1 EP04764503A EP04764503A EP1663646B1 EP 1663646 B1 EP1663646 B1 EP 1663646B1 EP 04764503 A EP04764503 A EP 04764503A EP 04764503 A EP04764503 A EP 04764503A EP 1663646 B1 EP1663646 B1 EP 1663646B1
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EP
European Patent Office
Prior art keywords
squeegee
printing
screen
grip
edge
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.)
Not-in-force
Application number
EP04764503A
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German (de)
French (fr)
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EP1663646A1 (en
Inventor
Ewald König
Elmar Winterhalter
Klaus Messmer
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Thieme GmbH and Co KG
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Thieme GmbH and Co KG
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Publication date
Application filed by Thieme GmbH and Co KG filed Critical Thieme GmbH and Co KG
Priority to PL04764503T priority Critical patent/PL1663646T3/en
Priority to SI200430710T priority patent/SI1663646T1/en
Publication of EP1663646A1 publication Critical patent/EP1663646A1/en
Application granted granted Critical
Publication of EP1663646B1 publication Critical patent/EP1663646B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors

Definitions

  • the invention relates to a screen printing squeegee with an elastic applicator element and a holding device, wherein the holding device is divided across the width of the squeegee seen in a plurality of mutually movable holding sections.
  • the invention also relates to a device for screen printing with a screen printing squeegee according to the invention.
  • Conventional screen printing devices are suitable for printing on flat objects, e.g. plane car glass panes.
  • the printed conductors of a rear window heater are applied to a flat glass pane by means of screen printing. After printing, the disc is heated and bent, at the same time curing the printed ink.
  • Subject of the European Patent Application EP 1 257 417 A is a doctor blade holder with a squeegee and a holding device.
  • the holding device is divided over the width of the squeegee into a plurality of holding sections, which are mutually movable.
  • a wiper arrangement for curved surfaces comprises a rubber lip and a holding device, which is divided over the length of the rubber lip into a plurality of mutually movable holding portions.
  • the British patent application GB 518,920 describes a wiper blade assembly for windshields with a wiper blade which is mounted in a holding device.
  • the holding device is divided over the entire length of the wiper blade into a plurality of mutually movable parts.
  • the printing of arbitrarily curved surfaces is to be made possible by screen printing.
  • a screen-printing squeegee with an elastic applicator element and a holding device is provided for this purpose, in which the holding device is divided over the width of the squeegee into a plurality of mutually movable holding sections, each guide section starting from each holding section at least during a printing operation on the applicator element.
  • the division into a plurality of mutually movable holding sections makes it possible to adapt the screen-printing squeegee to differently curved surfaces of an object to be printed. Since the holding sections can move relative to one another, the screen printing squeegee can already assume an approximately curved shape in the area of the holding sections, so that it is possible to ensure that the screen printing squeegees always print over their entire width on a printing screen and thus indirectly on the printing plate curved surface rests.
  • the guide plates By means of the guide plates, a uniform pressure distribution can be ensured on the pressure edge of thesecondalements. This is of particular importance because, with a curved course of the pressure edge of the application element, a distance from the pressure edge to a respective holding section changes. With constant material thickness and homogeneous material properties of the application element, this would result in a different contact pressure of the pressure edge, this effect can be compensated by the guide plates.
  • the material thickness and / or the elasticity of the applicator element could be adapted as a function of the distance of the pressure edge from a holding section.
  • the elastic applicator element is integrally formed and forms an elastic connection between the plurality of holding sections.
  • a pressure edge of the applicator element which faces an object to be printed, is designed to run curved.
  • a uniform support on a curved, to be printed object can be ensured and a uniform print image is achieved.
  • the course of the pressure edge is adapted to the curvature of the object to be printed.
  • a curvature profile of the pressure edge of the application element corresponds to a mean curvature of the article to be printed transversely to the direction of movement of the screen-printing squeegee.
  • the screen-printing squeegee can adapt within limits to a changing curvature profile of an object to be printed. If the curvature of the print edge is selected according to the mean curvature of the article to be printed, the required deformations of the screen squeegee are minimized during the printing process.
  • the guide plate extends from the holding section in the direction of the pressure edge of the applicator element, wherein an edge of the guide plate facing away from the holding section extends parallel to the pressure edge of the applicator element.
  • the guide plate is curved. In this way, an adaptation to the curvature of a surface to be printed can be improved.
  • a device for screen printing in which a screen-printing squeegee is provided with an elastic applicator element and a holding device, wherein the holding device is divided over the width of the squeegee seen in several, mutually movable holding sections and wherein each holding section at least one controllable adjusting element is assigned.
  • the contact pressure and / or the deflection of each holding section can be influenced individually in order to achieve the best possible adaptation of the screen-printing squeegee to the curvature of a surface to be printed.
  • the presentation of the Fig. 1 shows a Siebffyrakel 10 according to the invention with a plurality of holding sections 12, 14 and 15.
  • the Siebpecializingrakel 10 is connected to a doctor blade, not shown, a screen printing device, also not shown.
  • the screen printing blade 10 further comprises an elastic applicator element 18, which consists for example of an elastic rubber plate.
  • the elastic applicator element 18 is embodied in one piece over the entire width of the screen-printing squeegee 10 and accommodated in each of the holding sections 12, 14, 16.
  • the holding portions 12, 14, 16 are spaced from each other and connected only via the elastic applicator element 18.
  • the holding portions 12, 14, 16 are thereby movable relative to each other.
  • a printing edge 20 of the screen-printing squeegee 10 lying opposite the holding sections 12, 14, 16 is curved, the curvature of the printing edge 20 being adapted to the surface curvature of an article to be printed.
  • Each guide section 22, 24 or 26 is connected to each holding section 12, 14, 16, which extends from a respective holding section 12, 14, 16 in the direction of the pressure edge 20.
  • the guide plates 22, 24, 26 are applied to the elastic applicator element 18 to a uniform pressure distribution on the elastic applicator element 18th and thus to ensure a uniform contact pressure of the pressure edge 20 during a printing operation.
  • a lower edge of the guide plates 22, 24, 26 remote from the holding sections 12, 14, 16 runs parallel to the pressure edge 20 of the elastic applicator element 18.
  • left guide plate 22 of the left holding portion 12 extends on its, the middle guide plate 24 of the middle holding portion 14 side facing not in extension of the associated left holding portion 12, but starting from this towards a center of the pressure edge 20 and to this.
  • This side edge of the left guide plate 22 extends so far in the direction of the center of the pressure edge 20 that in the projection, in the Fig. 1 perpendicular to the top, one of the pressure edge 20 adjacent corner of the left guide plate 22, a left boundary of the middle holding portion 14 and thus partially covers a left boundary of the middle guide plate 24.
  • a left side edge of the middle guide plate 24 extends from the left boundary of the middle holding portion 14 also toward the center of the pressure edge 20 and approximately parallel to the right side edge of the left guide plate 22.
  • each holding section 12, 14, 16, each with two adjusting cylinders 30 is connected to the squeegee holder 28.
  • Each of the actuating cylinders 30 can be controlled individually by means of a control device 32 in order to set a relative position of the holding sections 12, 14, 16 relative to one another and a contact pressure of the pressure edge 20 of the screen-printing blade 10 over their length.
  • the contact pressure as well as the position of the pressure edge 20 of the squeegee blade 10 between a printing operation and, for example, a return movement of the doctor blade can be adjusted differently.
  • the curved extending pressure edge 20 of the squeegee 10 allows a uniform adaptation to the curved surface of an object to be printed 34, for example, a finished shaped car glass.
  • a printing screen which is necessarily to be arranged between the screen-printing squeegee 10 and the object 34 to be imprinted, is shown in FIG Fig. 2 not shown. Due to the mutually movable holding sections 12, 14, 16 and the individual adjustability of the holding sections 12, 14, 16 via the adjusting cylinder 30, the screen-printing blade 10 can be adapted to be verxenderde curvatures of the object 34 to be printed. In a longitudinal direction, that means in the direction of movement of the squeegee 10 changing curvature of the object to be printed 34, the curvature of the pressure edge 20 is selected according to a mean curvature of the object 34 to be printed.
  • the screen printing squeegee 10 can thus be printed by means of a conventional screen printing device transversely to the direction of printing curved objects, such as the object to be printed 34.
  • a screen printing device 40 are used together with the screen printing squeegee 10 according to the invention, as shown in the Fig. 3 is shown.
  • a printing unit frame 42 can perform a rocking motion during a printing movement of a squeegee holder 44 with a squeegee clamped therein, while the squeegee holder 44 is guided approximately parallel to a longitudinally curved surface of an object to be printed.
  • the doctor blade holder 44 is guided in slide tracks 46, which are adapted to the curvature of an article to be printed in the longitudinal direction, that is to say in the direction of movement of the doctor during the printing process.
  • slide tracks 46 are adapted to the curvature of an article to be printed in the longitudinal direction, that is to say in the direction of movement of the doctor during the printing process.
  • the rocking movement of the printing unit frame 42 which is caused by the movement of the guided on the printing unit frame 42 Ra Kelnalters 44, rolls a lower part of the printing unit frame 42 on a parallel to the slide track 46 extending from rolling surface.
  • the successive rolling surfaces are toothed, so that the printing unit frame 42 is fixed during a printing movement in the longitudinal direction.
  • the screen printing device 40 thus allows the printing of spherically curved objects, that is, objects which are curved both in the longitudinal direction and transversely to the longitudinal direction.
  • FIG Fig. 4 Another embodiment of a screen printing device 50 according to the invention is shown in FIG Fig. 4 shown.
  • a spherically curved object 52 is to be printed.
  • a surface curvature of the article 52 transversely to the longitudinal direction is taken into account by the screen printing squeegee 10 according to the invention, which in the Fig. 4 is indicated only schematically.
  • the curvature of the article to be printed 52 in the longitudinal direction is taken into account by a rocking movement of a printing unit frame 54, which is realized in the screen printing device 50 via four lifting columns 56 which are controlled by a control device, not shown.
  • the position of the printing unit frame 54 is adjusted so that the printing unit frame 54 and thus in the Fig. 4 not shown printing screen is always set tangentially to an imaginary line of contact between the pressure edge of the screen printing blade 10 and the surface of the object to be printed 52.
  • the screen printing device 50 can be freely programmed with respect to the control of the lifting columns 56, so that only a reprogramming is required to take into account different curvatures of objects to be printed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Screen Printers (AREA)
  • Rotary Presses (AREA)
  • Manufacturing Of Printed Wiring (AREA)
  • Non-Metallic Protective Coatings For Printed Circuits (AREA)
  • Gas-Filled Discharge Tubes (AREA)

Abstract

A screen printing squeegee doctor blade includes an elastic application element and a maintaining or gripping device. The grip is subdivided into several grip sections which can be displaced in relation to each other over the width of the screen printing doctor blade. The squeegee may be used, for example, for printing curved vehicle windshields.

Description

Die Erfindung betrifft eine Siebdruckrakel mit einem elastischen Auftragselement und einer Haltevorrichtung, wobei die Haltevorrichtung über die Breite der Siebdruckrakel gesehen in mehrere, zueinander bewegliche Halteabschnitte aufgeteilt ist. Die Erfindung betrifft auch eine Vorrichtung zum Siebdrucken mit einer erfindungsgemäßen Siebdruckrakel.The invention relates to a screen printing squeegee with an elastic applicator element and a holding device, wherein the holding device is divided across the width of the squeegee seen in a plurality of mutually movable holding sections. The invention also relates to a device for screen printing with a screen printing squeegee according to the invention.

Herkömmliche Siebdruckvorrichtungen sind zum Bedrucken planer Gegenstände geeignet, z.B. plane Autoglasscheiben. Beispielsweise werden mittels Siebdruck die Leiterbahnen einer Heckscheibenheizung auf eine plane Autoglasscheibe aufgebracht. Nach dem Bedrucken wird die Scheibe erwärmt und gebogen, wobei gleichzeitig die aufgedruckte Farbe aushärtet.Conventional screen printing devices are suitable for printing on flat objects, e.g. plane car glass panes. For example, the printed conductors of a rear window heater are applied to a flat glass pane by means of screen printing. After printing, the disc is heated and bent, at the same time curing the printed ink.

Aus der deutschen Offenlegungsschrift DE 214 31 37 ist eine Vorrichtung zum Bedrucken von Rotationskörpem bekannt. Dabei wird die zu bedruckende rotationssymmetrische Oberfläche eines Gegenstandes auf einem feststehenden Sieb abgerollt. Auf der der zu bedruckenden Oberfläche gegenüberliegenden Seite des Drucksiebes wird eine Rakel über das Sieb bewegt, die auf dem Sieb befindliche Farbe durch dieses auf die abrollende Oberfläche des Gegenstandes drückt. Eine solche Vorrichtung zum Siebdrucken ist nur für rotationssymmetrische Oberflächen geeignet.From the German Offenlegungsschrift DE 214 31 37 a device for printing Rotationskörpem is known. This is the zu unrolled rotating symmetrical surface of an object on a stationary screen. On the side of the printing screen opposite the surface to be printed, a squeegee is moved over the sieve, pressing the ink on the sieve through the latter onto the unrolling surface of the article. Such a device for screen printing is only suitable for rotationally symmetrical surfaces.

Gegenstand der europäischen Patentanmeldung EP 1 257 417 A ist ein Rakelhalter mit einer Rakel und einer Haltevorrichtung. Die Haltevorrichtung ist über die Breite der Rakel in mehrere Halteabschnitte aufgeteilt, die zueinander beweglich sind.Subject of the European Patent Application EP 1 257 417 A is a doctor blade holder with a squeegee and a holding device. The holding device is divided over the width of the squeegee into a plurality of holding sections, which are mutually movable.

In der britischen Patentanmeldung GB 667,253 ist eine Scheibenwischeranordnung für gekrümmte Oberflächen beschrieben. Die Anordnung weist eine Gummilippe und eine Haltevorrichtung auf, die über die Länge der Gummilippe in mehrere, zueinander bewegliche Halteabschnitte unterteilt ist.In the British patent application GB 667,253 a wiper arrangement for curved surfaces is described. The arrangement comprises a rubber lip and a holding device, which is divided over the length of the rubber lip into a plurality of mutually movable holding portions.

Die britische Patentanmeldung GB 518,920 beschreibt eine Wischblattanordnung für Windschutzscheiben mit einem Wischblatt, das in einer Haltevorrichtung befestigt ist. Die Haltevorrichtung ist über die gesamte Länge des Wischblatts in mehrere, zueinander bewegliche Teile unterteilt.The British patent application GB 518,920 describes a wiper blade assembly for windshields with a wiper blade which is mounted in a holding device. The holding device is divided over the entire length of the wiper blade into a plurality of mutually movable parts.

In der britischen Patentanmeldung GB 288,838 ist eine Anordnung eines Scheibenwischers für Straßenfahrzeuge beschrieben, in der eine Gummilippe mittels Haltevorrichtungen geführt wird, die über die Länge der Gummilippe in mehrere, zueinander bewegliche Teile aufgeteilt ist.In the British patent application GB 288,838 an arrangement of a windshield wiper for road vehicles is described, in which a rubber lip is guided by means of holding devices, which is divided over the length of the rubber lip into a plurality of mutually movable parts.

Aus der britischen Patentanmeldung GB 524,234 sind Wischerblätter für Windschutzscheiben bekannt, bei denen mittels einer Haltevorrichtung Gummistreifen miteinander befestigt werden.From the British patent application GB 524,234 Wiper blades for windshields are known in which rubber strips are fastened together by means of a holding device.

Gegenstand der französischen Patentanmeldung FR 1 584 995 ist eine Siebdruckvorrichtung mit einem Halteelement und einem AuftragselementSubject of the French patent application FR 1 584 995 is a screen printing device with a holding element and an applicator element

In der deutschen Offenlegungsschrift DE 2 302 728 A ist eine Siebdruckrakeleinrichtung beschrieben, in der ein Rakel von einem Rakelhalter geführt ist.In the German Offenlegungsschrift DE 2 302 728 A a screen printing device is described in which a doctor blade is guided by a doctor blade holder.

Mit der Erfindung soll das Bedrucken beliebig gekrümmter Oberflächen mittels Siebdruck ermöglicht werden.With the invention, the printing of arbitrarily curved surfaces is to be made possible by screen printing.

Erfindungsgemäß ist hierzu eine Siebdruckrakel mit einem elastischen Auftragselement und einer Haltevorrichtung vorgesehen, bei der die Haltevorrichtung über die Breite der Siebdruckrakel gesehen in mehrere, zueinander bewegliche Halteabschnitte aufgeteilt ist, wobei von jedem Halteabschnitt ein wenigstens während eines Druckvorgangs an dem Auftragselement anliegendes Führungsblech ausgeht.According to the invention, a screen-printing squeegee with an elastic applicator element and a holding device is provided for this purpose, in which the holding device is divided over the width of the squeegee into a plurality of mutually movable holding sections, each guide section starting from each holding section at least during a printing operation on the applicator element.

Die Aufteilung in mehrere, zueinander bewegliche Halteabschnitte ermöglicht eine Anpassung der Siebdruckrakel an unterschiedlich gekrümmte Oberflächen eines zu bedruckenden Gegenstandes. Da sich die Halteabschnitte relativ zueinander bewegen können, kann die Siebdruckrakel bereits im Bereich der Halteabschnitte eine annähernd gekrümmte Form einnehmen, so dass sichergestellt werden kann, dass die Siebdruckrakel während eines Druckvorgangs stets über ihre gesamte Breite auf einem Drucksieb und damit mittelbar auf der zu bedruckenden gekrümmten Oberfläche aufliegt.The division into a plurality of mutually movable holding sections makes it possible to adapt the screen-printing squeegee to differently curved surfaces of an object to be printed. Since the holding sections can move relative to one another, the screen printing squeegee can already assume an approximately curved shape in the area of the holding sections, so that it is possible to ensure that the screen printing squeegees always print over their entire width on a printing screen and thus indirectly on the printing plate curved surface rests.

Mittels der Führungsbleche kann eine gleichmäßige Druckverteilung auf die Druckkante des Auftragsalements sichergestellt werden. Dies ist insbesondere deshalb von Bedeutung, da bei einem gekrümmten Verlauf der Druckkante des Auftragselements sich ein Abstand von der Druckkante zu einem jeweiligen Halteabschnitt ändert. Bei konstanter Materialdicke und homogenen Materialeigenschaften des Auftragselements würde dies in einem unterschiedlichen Anpressdruck der Druckkante resultieren, wobei dieser Effekt durch die Führungsbleche ausgeglichen werden kann. Alternativ könnte die Materialstärke und/oder die Elastizität des Auftragselements in Abhängigkeit des Abstandes der Druckkante von einem Halteabschnitt angepasst werden.By means of the guide plates, a uniform pressure distribution can be ensured on the pressure edge of the Auftragalements. This is of particular importance because, with a curved course of the pressure edge of the application element, a distance from the pressure edge to a respective holding section changes. With constant material thickness and homogeneous material properties of the application element, this would result in a different contact pressure of the pressure edge, this effect can be compensated by the guide plates. Alternatively, the material thickness and / or the elasticity of the applicator element could be adapted as a function of the distance of the pressure edge from a holding section.

In Weiterbildung der Erfindung ist das elastische Auftragselement einstückig ausgebildet und bildet eine elastische Verbindung zwischen den mehreren Halteabschnitten.In a further development of the invention, the elastic applicator element is integrally formed and forms an elastic connection between the plurality of holding sections.

Durch ein einstückiges Auftragselement wird eine gleichmäßige Farbverteilung über das Drucksieb gewährleistet und dennoch ist sichergestellt, dass die Halteabschnitte der Siebdruckrakel zueinander beweglich sind und somit die Siebdruckrakel insgesamt eine gekrümmte Form annehmen kann.By a one-piece application element a uniform color distribution over the printing screen is ensured and yet it is ensured that the holding sections of the screen printing squeegee are mutually movable and thus the Siebdruckrakel can assume a curved overall shape.

In Weiterbildung der Erfindung ist eine Druckkante des Auftragselements, die einem zu bedruckenden Gegenstand zugewandt ist, gekrümmt verlaufend ausgebildet.In a further development of the invention, a pressure edge of the applicator element, which faces an object to be printed, is designed to run curved.

Durch eine gekrümmt verlaufende Druckkante kann eine gleichmäßige Auflage auf einem gekrümmten, zu bedruckenden Gegenstand sichergestellt werden und ein gleichmäßiges Druckbild wird erreicht. Bei konstanter Krümmung in Druckrichtung gesehen, wird der Verlauf der Druckkante an den Krümmungsverlauf des zu bedruckenden Gegenstandes angepasst.By a curved extending pressure edge, a uniform support on a curved, to be printed object can be ensured and a uniform print image is achieved. With constant curvature seen in the printing direction, the course of the pressure edge is adapted to the curvature of the object to be printed.

In Weiterbildung der Erfindung entspricht ein Krümmungsverlauf der Druckkante des Auftragselements einem mittleren Krümmungsverlauf des zu bedruckenden Gegenstandes quer zur Bewegungsrichtung der Siebdruckrakel.In a development of the invention, a curvature profile of the pressure edge of the application element corresponds to a mean curvature of the article to be printed transversely to the direction of movement of the screen-printing squeegee.

Aufgrund der Elastizität des Auftragselements sowie der relativen Beweglichkeit der Halteabschnitte zueinander kann sich die Siebdruckrakel in Grenzen an einen sich ändernden Krümmungsverlauf eines zu bedruckenden Gegenstandes anpassen. Wird der Krümmungsverlauf der Druckkante entsprechend dem mittleren Krümmungsverlauf des zu bedruckenden Gegenstandes gewählt, sind die erforderlichen Verformungen der Siebdruckrakel während des Druckvorganges minimiert.Due to the elasticity of the applicator element as well as the relative mobility of the holding sections relative to one another, the screen-printing squeegee can adapt within limits to a changing curvature profile of an object to be printed. If the curvature of the print edge is selected according to the mean curvature of the article to be printed, the required deformations of the screen squeegee are minimized during the printing process.

In Weiterbildung der Erfindung erstreckt sich das Führungsblech vom Halteabschnitt aus in Richtung auf die Druckkante des Auftragselements, wobei eine dem Halteabschnitt abgewandte Kante des Führungsblechs parallel zur Druckkante des Auftragselements verläuft.In a further development of the invention, the guide plate extends from the holding section in the direction of the pressure edge of the applicator element, wherein an edge of the guide plate facing away from the holding section extends parallel to the pressure edge of the applicator element.

Auch auf diese Weise wird ein über die Länge der Druckkante konstanter Anpressdruck gewährleistet.In this way, over the length of the pressure edge constant contact pressure is ensured.

In Weiterbildung der Erfindung ist das Führungsblech gekrümmt ausgebildet. Auf diese Weise kann eine Anpassung an die Krümmung einer zu bedruckenden Oberfläche verbessert werden.In a further development of the invention, the guide plate is curved. In this way, an adaptation to the curvature of a surface to be printed can be improved.

Das der Erfindung zugrunde liegende Problem wird auch durch eine Vorrichtung zum Siebdrucken gelöst, bei der eine Siebdruckrakel mit einem elastischen Auftragselement und einer Haltevorrichtung vorgesehen ist, wobei die Haltevorrichtung über die Breite der Siebdruckrakel gesehen in mehrere, zueinander bewegliche Halteabschnitte aufgeteilt ist und wobei jedem Halteabschnitt wenigstens ein steuerbares Verstellelement zugeordnet ist.The problem underlying the invention is also solved by a device for screen printing, in which a screen-printing squeegee is provided with an elastic applicator element and a holding device, wherein the holding device is divided over the width of the squeegee seen in several, mutually movable holding sections and wherein each holding section at least one controllable adjusting element is assigned.

Durch diese Maßnahmen kann der Anpressdruck und/oder die Auslenkung eines jeden Halteabschnitts individuell beeinflusst werden, um eine möglichst gute Anpassung der Siebdruckrakel an die Krümmung einer zu bedruckenden Oberfläche zu erreichen.By means of these measures, the contact pressure and / or the deflection of each holding section can be influenced individually in order to achieve the best possible adaptation of the screen-printing squeegee to the curvature of a surface to be printed.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus den Ansprüchen und der nachfolgenden Beschreibung bevorzugter Ausführungsformen der Erfindung im Zusammenhang mit den Zeichnungen. In den Zeichnungen zeigen:

Fig. 1
eine Vorderansicht einer Siebdruckrakel gemäß einer bevorzugten Ausführungsform der Erfindung,
Fig. 2
die Siebdruckrakel der Fig. 1 in einer abschnittsweise dargestellten Siebdruckvorrichtung,
Fig. 3
eine erfindungsgemäße Siebdruckvorrichtung und
Fig.4
eine weitere Ausführungsform einer erfindungsgemäßen Siebdruckvorrichtung.
Further features and advantages of the invention will become apparent from the claims and the following description of preferred embodiments of the invention in conjunction with the drawings. In the drawings show:
Fig. 1
a front view of a screen printing squeegee according to a preferred embodiment of the invention,
Fig. 2
the squeegee of the Fig. 1 in a screen printing device shown in sections,
Fig. 3
a screen printing device according to the invention and
Figure 4
a further embodiment of a screen printing device according to the invention.

Die Darstellung der Fig. 1 zeigt eine erfindungsgemäße Siebdruckrakel 10 mit mehreren Halteabschnitten 12, 14 und 15. Mittels der Halteabschnitte 12, 14, 16 wird die Siebdruckrakel 10 mit einem nicht dargestellten Rakelhalter einer ebenfalls nicht dargestellten Siebdruckvorrichtung verbunden. Die Siebdruckrakel 10 weist weiterhin ein elastisches Auftragselement 18 auf, das beispielsweise aus einer elastischen Gummiplatte besteht. Das elastische Auftragselement 18 ist einstückig über die gesamte Breite der Siebdruckrakel 10 ausgeführt und in jedem der Halteabschnitte 12, 14, 16 aufgenommen. Die Halteabschnitte 12, 14, 16 sind beabstandet zueinander angeordnet und lediglich über das elastische Auftragselement 18 miteinander verbunden. Die Halteabschnitte 12, 14, 16 sind dadurch relativ zueinander beweglich.The presentation of the Fig. 1 shows a Siebdruckrakel 10 according to the invention with a plurality of holding sections 12, 14 and 15. By means of the holding sections 12, 14, 16, the Siebdruckrakel 10 is connected to a doctor blade, not shown, a screen printing device, also not shown. The screen printing blade 10 further comprises an elastic applicator element 18, which consists for example of an elastic rubber plate. The elastic applicator element 18 is embodied in one piece over the entire width of the screen-printing squeegee 10 and accommodated in each of the holding sections 12, 14, 16. The holding portions 12, 14, 16 are spaced from each other and connected only via the elastic applicator element 18. The holding portions 12, 14, 16 are thereby movable relative to each other.

Eine den Halteabschnitten 12, 14, 16 gegenüberliegende Druckkante 20 der Siebdruckrakel 10 ist gekrümmt ausgeführt, wobei die Krümmung der Druckkante 20 an die Oberflächenkrümmung eines zu bedruckenden Gegenstandes angepasst ist.A printing edge 20 of the screen-printing squeegee 10 lying opposite the holding sections 12, 14, 16 is curved, the curvature of the printing edge 20 being adapted to the surface curvature of an article to be printed.

Mit jedem Halteabschnitt 12, 14, 16 ist jeweils ein Führungsblech 22, 24 bzw. 26 verbunden, das sich von einem jeweiligen Halteabschnitt 12, 14, 16 aus in Richtung auf die Druckkante 20 erstreckt. Die Führungsbleche 22, 24, 26 liegen an dem elastischen Auftragselement 18 an, um eine gleichmäßige Druckverteilung auf das elastische Auftragselement 18 und somit einen gleichmäßigen Anpressdruck der Druckkante 20 während eines Druckvorgangs zu gewährleisten. Eine den Halteabschnitten 12, 14, 16 abgewandte Unterkante der Führungsbleche 22, 24, 26 verläuft parallel zur Druckkante 20 des elastischen Auftragselement 18. Dadurch kann über die gesamte Breite der Siebdruckrakel 10 ein gleichmäßiges elastisches Verhalten der Druckkante 20 gewährleistet werden.Each guide section 22, 24 or 26 is connected to each holding section 12, 14, 16, which extends from a respective holding section 12, 14, 16 in the direction of the pressure edge 20. The guide plates 22, 24, 26 are applied to the elastic applicator element 18 to a uniform pressure distribution on the elastic applicator element 18th and thus to ensure a uniform contact pressure of the pressure edge 20 during a printing operation. A lower edge of the guide plates 22, 24, 26 remote from the holding sections 12, 14, 16 runs parallel to the pressure edge 20 of the elastic applicator element 18. As a result, a uniform elastic behavior of the pressure edge 20 can be ensured over the entire width of the screen-printing squeegee 10.

Das in der Fig. 1 linke Führungsblech 22 des linken Halteabschnitts 12 verläuft auf seiner, dem mittleren Führungsblech 24 des mittleren Halteabschnitts 14 zugewandten Seite nicht in Verlängerung des zugeordneten linken Halteabschnitts 12, sondern von diesem ausgehend in Richtung auf eine Mitte der Druckkante 20 und auf diese zu. Diese Seitenkante des linken Führungsblechs 22 erstreckt sich dabei so weit in Richtung auf die Mitte der Druckkante 20, dass in der Projektion, in der Fig. 1 senkrecht nach oben, eine der Druckkante 20 benachbarte Ecke des linken Führungsblechs 22 eine linke Begrenzung des mittleren Halteabschnitts 14 und somit auch teilweise eine linke Begrenzung des mittleren Führungsblechs 24 überdeckt. Eine linke Seitenkante des mittleren Führungsblechs 24 verläuft ausgehend von der linken Begrenzung des mittleren Halteabschnitts 14 ebenfalls in Richtung auf die Mitte der Druckkante 20 und annähernd parallel zur rechten Seitenkante des linken Führungsblechs 22. Symmetrisch hierzu ist die rechte Seitenkante des mittleren Führungsblechs 24 sowie die zu dieser parallele linke Seitenkante des rechten Führungsblechs 26 ausgebildet. Durch diese Gestaltung der Führungsbleche 22, 24, 26 wird eine annähernd gleichmäßige Kraftverteilung auf das elastische Auftragselement 18 und speziell dessen Druckkante 20 erreicht.That in the Fig. 1 left guide plate 22 of the left holding portion 12 extends on its, the middle guide plate 24 of the middle holding portion 14 side facing not in extension of the associated left holding portion 12, but starting from this towards a center of the pressure edge 20 and to this. This side edge of the left guide plate 22 extends so far in the direction of the center of the pressure edge 20 that in the projection, in the Fig. 1 perpendicular to the top, one of the pressure edge 20 adjacent corner of the left guide plate 22, a left boundary of the middle holding portion 14 and thus partially covers a left boundary of the middle guide plate 24. A left side edge of the middle guide plate 24 extends from the left boundary of the middle holding portion 14 also toward the center of the pressure edge 20 and approximately parallel to the right side edge of the left guide plate 22. Symmetrically this is the right side edge of the middle guide plate 24 and the this parallel left side edge of the right guide plate 26 is formed. By this design of the guide plates 22, 24, 26 an approximately uniform force distribution on the elastic applicator element 18 and especially its pressure edge 20 is achieved.

In der Darstellung der Fig. 2 ist die Siebdruckrakel 10 der Fig. 1 im montierten Zustand an einem Rakelhalter 28 dargestellt. Es ist zu erkennen, dass jeder Halteabschnitt 12, 14, 16 mit jeweils zwei Verstellzylindern 30 mit dem Rakelhalter 28 verbunden ist. Jeder der Stellzylinder 30 kann mittels eines Steuergeräts 32 einzeln angesteuert werden, um eine relative Lage der Halteabschnitte 12, 14, 16 zueinander sowie einen Anpressdruck der Druckkante 20 der Siebdruckrakel 10 über deren Länge unterschiedlich einzustellen. Mittels der Verstellzylinder 30 kann darüber hinaus auch der Anpressdruck sowie die Lage der Druckkante 20 der Siebdruckrakel 10 zwischen einem Druckvorgang und beispielsweise einer Rückbewegung der Rakel unterschiedlich eingestellt werden.In the presentation of the Fig. 2 is the screen squeegee 10 of Fig. 1 shown in the assembled state on a doctor blade holder 28. It can be seen that each holding section 12, 14, 16, each with two adjusting cylinders 30 is connected to the squeegee holder 28. Each of the actuating cylinders 30 can be controlled individually by means of a control device 32 in order to set a relative position of the holding sections 12, 14, 16 relative to one another and a contact pressure of the pressure edge 20 of the screen-printing blade 10 over their length. By means of the adjusting cylinder 30, moreover, the contact pressure as well as the position of the pressure edge 20 of the squeegee blade 10 between a printing operation and, for example, a return movement of the doctor blade can be adjusted differently.

Wie in der Fig. 2 zu erkennen ist, erlaubt die gekrümmt verlaufende Druckkante 20 der Siebdruckrakel 10 eine gleichmäßige Anpassung an die gekrümmte Oberfläche eines zu bedruckenden Gegenstandes 34, beispielsweise einer fertig geformten Autoglasscheibe. Ein notwendigerweise zwischen Siebdruckrakel 10 und zu bedruckendem Gegenstand 34 anzuordnendes Drucksieb ist der Einfachheit halber in der Fig. 2 nicht dargestellt. Aufgrund der zueinander beweglichen Halteabschnitte 12, 14, 16 sowie der individuellen Einstellbarkeit der Halteabschnitte 12, 14, 16 über die Verstellzylinder 30 kann die Siebdruckrakel 10 auch an sich verähdernde Krümmungen des zu bedruckenden Gegenstandes 34 angepasst werden. Bei einer sich in Längsrichtung, das bedeutet in Bewegungsrichtung der Siebdruckrakel 10 verändernder Krümmung des zu bedruckenden Gegenstandes 34 wird der Krümmungsverlauf der Druckkante 20 entsprechend einem mittleren Krümmungsverlauf des zu bedruckenden Gegenstandes 34 gewählt.Like in the Fig. 2 can be seen, the curved extending pressure edge 20 of the squeegee 10 allows a uniform adaptation to the curved surface of an object to be printed 34, for example, a finished shaped car glass. A printing screen, which is necessarily to be arranged between the screen-printing squeegee 10 and the object 34 to be imprinted, is shown in FIG Fig. 2 not shown. Due to the mutually movable holding sections 12, 14, 16 and the individual adjustability of the holding sections 12, 14, 16 via the adjusting cylinder 30, the screen-printing blade 10 can be adapted to be verwähenderde curvatures of the object 34 to be printed. In a longitudinal direction, that means in the direction of movement of the squeegee 10 changing curvature of the object to be printed 34, the curvature of the pressure edge 20 is selected according to a mean curvature of the object 34 to be printed.

Mittels der erfindungsgemäßen Siebdruckrakel 10 können somit mittels einer herkömmlichen Siebdruckvorrichtung quer zur Druckrichtung gekrümmte Gegenstände, wie der zu bedruckende Gegenstand 34, bedruckt werden.By means of the screen printing squeegee 10 according to the invention can thus be printed by means of a conventional screen printing device transversely to the direction of printing curved objects, such as the object to be printed 34.

Sollen darüber hinaus sphärisch gekrümmte Gegenstände, beispielsweise fertig geformte Autoglasscheiben, bedruckt werden, kann hierzu eine Siebdruckvorrichtung 40 zusammen mit der erfindungsgemäßen Siebdruckrakel 10 eingesetzt werden, wie sie in der Fig. 3 dargestellt ist. Bei der Siebdruckvorrichtung 40 kann ein Druckwerksrahmen 42 während einer Druckbewegung eines Rakelhalters 44 mit einer darin eingespannten Siebdruckrakel eine Wippbewegung ausführen, während der Rakelhalter 44 annähernd parallel zu einer in Längsrichtung gekrümmten Oberfläche eines zu bedruckenden Gegenstandes geführt wird. Der Rakelhalter 44 wird hierzu in Kulissenbahnen 46 geführt, die an die Krümmung eines zu bedruckenden Gegenstandes in Längsrichtung, das bedeutet in Bewegungsrichtung der Rakel beim Druckvorgang, angepasst sind. Während der Wippbewegung des Druckwerksrahmens 42, die durch die Bewegung des am Druckwerksrahmen 42 geführten Ra-Kelnalters 44 verursach ist, rollt eine Unterselte des Druckwerksrahmens 42 auf einer parallel zur Kulissenbahn 46 verlaufenden Abrollfläche ab. Die aufeinander abrollenden Flächen sind dabei verzahnt, so dass der Druckwerksrahmen 42 während einer Druckbewegung in Längsrichtung fixiert ist. Zusammen mit der erfindungsgemäßen Siebdruckrakel 10 erlaubt die Siebdruckvorrichtung 40 damit das Bedrucken von sphärisch gekrümmten Gegenständen, das bedeutet Gegenständen, die sowohl in Längsrichtung als auch quer zur Längsrichtung gekrümmt sind.If, in addition, spherically curved objects, for example ready-shaped car glass panes, are to be printed, this can be done a screen printing device 40 are used together with the screen printing squeegee 10 according to the invention, as shown in the Fig. 3 is shown. In the screen printing apparatus 40, a printing unit frame 42 can perform a rocking motion during a printing movement of a squeegee holder 44 with a squeegee clamped therein, while the squeegee holder 44 is guided approximately parallel to a longitudinally curved surface of an object to be printed. For this purpose, the doctor blade holder 44 is guided in slide tracks 46, which are adapted to the curvature of an article to be printed in the longitudinal direction, that is to say in the direction of movement of the doctor during the printing process. During the rocking movement of the printing unit frame 42, which is caused by the movement of the guided on the printing unit frame 42 Ra Kelnalters 44, rolls a lower part of the printing unit frame 42 on a parallel to the slide track 46 extending from rolling surface. The successive rolling surfaces are toothed, so that the printing unit frame 42 is fixed during a printing movement in the longitudinal direction. Together with the screen printing squeegee 10 according to the invention, the screen printing device 40 thus allows the printing of spherically curved objects, that is, objects which are curved both in the longitudinal direction and transversely to the longitudinal direction.

Eine weitere erfindungsgemäße Ausführungsform einer Siebdruckvorrichtung 50 ist in der Fig. 4 dargestellt. Mit der Siebdruckvorrichtung 50 soll ein sphärisch gekrümmter Gegenstand 52 bedruckt werden. Eine Oberflächenkrümmung des Gegenstands 52 quer zur Längsrichtung wird dabei durch die erfindungsgemäße Siebdruckrakel 10 berücksichtigt, die in der Fig. 4 lediglich schematisch angedeutet ist. Die Krümmung des zu bedruckenden Gegenstandes 52 in Längsrichtung wird durch eine Wippbewegung eines Druckwerksrahmens 54 berücksichtigt, die bei der Siebdruckvorrichtung 50 über vier Hubsäulen 56 realisiert wird, die mittels eines nicht dargestellten Steuergeräts ansteuerbar sind.Another embodiment of a screen printing device 50 according to the invention is shown in FIG Fig. 4 shown. With the screen printing device 50, a spherically curved object 52 is to be printed. A surface curvature of the article 52 transversely to the longitudinal direction is taken into account by the screen printing squeegee 10 according to the invention, which in the Fig. 4 is indicated only schematically. The curvature of the article to be printed 52 in the longitudinal direction is taken into account by a rocking movement of a printing unit frame 54, which is realized in the screen printing device 50 via four lifting columns 56 which are controlled by a control device, not shown.

Durch entsprechende Ansteuerung der Hubsäulen 56 wird die Lage des Druckwerksrahmens 54 so eingestellt, dass der Druckwerksrahmen 54 und somit ein in der Fig. 4 nicht dargestelltes Drucksieb stets tangential zu einer gedachten Berührungslinie zwischen der Druckkante der Siebdruckrakel 10 und der Oberfläche des zu bedruckenden Gegenstandes 52 eingestellt ist. Im Unterschied zur Siebdruckvorrichtung 40 der Fig. 3 kann die Siebdruckvorrichtung 50 bezüglich der Ansteuerung der Hubsäulen 56 frei programmiert werden, so dass zur Berücksichtigung unterschiedlicher Krümmungen von zu bedruckenden Gegenständen lediglich eine Umprogrammierung erforderlich ist.By appropriate control of the lifting columns 56, the position of the printing unit frame 54 is adjusted so that the printing unit frame 54 and thus in the Fig. 4 not shown printing screen is always set tangentially to an imaginary line of contact between the pressure edge of the screen printing blade 10 and the surface of the object to be printed 52. In contrast to the screen printing device 40 of Fig. 3 For example, the screen printing device 50 can be freely programmed with respect to the control of the lifting columns 56, so that only a reprogramming is required to take into account different curvatures of objects to be printed.

Claims (7)

  1. A squeegee for screen-process printing having an elastic applicator (18) and a grip, wherein the grip is subdivided into several segments (12, 14, 16) that are distributed over the width of the squeegee (10) and free to move relative to one another, characterized in that each grip segment (12, 14, 16) has a guide plate (22, 24, 26) protruding therefrom that abuts against the applicator (18) at least during a printing procedure.
  2. A squeegee according to claim 1, characterized in that the elastic applicator (18) is configured in the form of a monolithic unit and forms elastic links joining the several grip segments (12, 14, 16).
  3. A squeegee according to claim 1 or claim 2, characterized in that a printing edge (20) of the applicator (18), which edge faces an item (34) to be imprinted, is curved.
  4. A squeegee according to claim 3, characterized in that the curvature of the printing edge (20) of the applicator (18) corresponds to an average curvature of the item (34) to be imprinted along an axis transverse to the direction of motion of the squeegee (10).
  5. A squeegee for screen-process printing according to any of the foregoing claims, characterized in that the guide plate (22, 24, 26) protruding from the grip segment (12, 14, 16) protrudes toward the printing edge (20) of the applicator (18), where an edge of the guide plate (22, 24, 26) that faces away from the grip segment (12, 14, 16) is parallel to the printing edge (20) of the applicator (18).
  6. A squeegee for screen-process printing according to claim 5, characterized in that the guide plate is curved.
  7. A device for screen-process printing having a squeegee (10) having an elastic applicator (18) and a grip, where the grip is subdivided into several grip segments (12, 14, 16) that are distributed over the width of the squeegee (10) and free to move relative to one another, and every grip segment (12, 14, 16) is allocated to at least one controllable adjustment component (30).
EP04764503A 2003-09-16 2004-08-26 Screen printing doctor blade and device for screen printing Not-in-force EP1663646B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL04764503T PL1663646T3 (en) 2003-09-16 2004-08-26 Screen printing doctor blade and device for screen printing
SI200430710T SI1663646T1 (en) 2003-09-16 2004-08-26 Screen printing doctor blade and device for screen printing

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10344023A DE10344023B4 (en) 2003-09-16 2003-09-16 Screening squeegee and device for screen printing
PCT/EP2004/009527 WO2005035250A1 (en) 2003-09-16 2004-08-26 Screen printing doctor blade and device for screen printing

Publications (2)

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EP1663646A1 EP1663646A1 (en) 2006-06-07
EP1663646B1 true EP1663646B1 (en) 2008-02-20

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US (1) US20080034989A1 (en)
EP (1) EP1663646B1 (en)
AT (1) ATE386635T1 (en)
CA (1) CA2537834A1 (en)
DE (2) DE10344023B4 (en)
ES (1) ES2300813T3 (en)
PL (1) PL1663646T3 (en)
SI (1) SI1663646T1 (en)
WO (1) WO2005035250A1 (en)

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DE202011107661U1 (en) 2011-11-07 2013-02-08 Thieme Gmbh & Co. Kg Screening squeegee and device for screen printing
DE102015212515A1 (en) 2015-07-03 2017-01-05 Thieme Gmbh & Co. Kg Screen printing apparatus and method for screen printing
DE102015008838B4 (en) 2015-07-05 2023-10-12 INPRO Innovationsgesellschaft für fortgeschrittene Produktionssysteme in der Fahrzeugindustrie mbH Method for producing a heating system on a 3D plastic window such as a 3D plastic vehicle window
KR101827154B1 (en) * 2016-10-13 2018-02-07 현대자동차주식회사 Coating method of 3-dimensional substrate with electrical-conductive ink and appratus thereof
CN111959097A (en) * 2020-08-07 2020-11-20 亳州市陆亿玖商贸有限公司 Energy-saving printing machine
CN112092493B (en) * 2020-09-15 2022-09-02 南京神雨食品科技有限公司 Portable thermos cup silk screen printing device

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GB288838A (en) * 1927-05-13 1928-04-19 Alfred Charles Adams Improvements in or relating to windscreen wipers for road vehicles
GB518920A (en) * 1938-08-04 1940-03-12 William Edward O Shei Improvements in or relating to windscreen wiper blades, and methods of assembly thereof
GB524234A (en) * 1939-01-24 1940-08-01 William Edward O Shei Improvements in or relating to windscreen wiper blades
GB667253A (en) * 1949-01-08 1952-02-27 Trico Products Corp Improvements in or relating to windscreen wipers
DE1819026U (en) * 1960-01-30 1960-10-06 Andreas Peschl ADJUSTABLE AND SPRING SQUEEGEE FOR SCREEN PRINTING MACHINES IN ROUND AND FLAT PRINTING
FR1584995A (en) * 1968-03-27 1970-01-09
DE2143137A1 (en) * 1971-08-28 1973-03-01 Isimat Siebdruck Inhaber Peter MACHINE AND PROCESS FOR CONTINUOUS PRINTING OF ROTARY BODIES IN THE SCREEN PRINTING PROCESS
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US4638733A (en) * 1984-01-20 1987-01-27 Horst Rebhan Squeegee head for printing of bodies by the screen printing method
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US7182019B2 (en) * 2004-01-23 2007-02-27 Exatec, Llc Screen printing apparatus

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US20080034989A1 (en) 2008-02-14
ATE386635T1 (en) 2008-03-15
DE10344023A1 (en) 2005-04-14
CA2537834A1 (en) 2005-04-21
EP1663646A1 (en) 2006-06-07
ES2300813T3 (en) 2008-06-16
DE502004006270D1 (en) 2008-04-03
SI1663646T1 (en) 2008-08-31
DE10344023B4 (en) 2006-06-14
PL1663646T3 (en) 2008-07-31
WO2005035250A1 (en) 2005-04-21

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