EP0422344B1 - Doctor blade device - Google Patents

Doctor blade device Download PDF

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Publication number
EP0422344B1
EP0422344B1 EP90114725A EP90114725A EP0422344B1 EP 0422344 B1 EP0422344 B1 EP 0422344B1 EP 90114725 A EP90114725 A EP 90114725A EP 90114725 A EP90114725 A EP 90114725A EP 0422344 B1 EP0422344 B1 EP 0422344B1
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EP
European Patent Office
Prior art keywords
doctor blade
roller
doctor
carriage
holder
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 - Lifetime
Application number
EP90114725A
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German (de)
French (fr)
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EP0422344A3 (en
EP0422344A2 (en
Inventor
Herbert Lübke
Volker Schröder
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.)
Windmoeller and Hoelscher KG
Original Assignee
Windmoeller and Hoelscher KG
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Publication date
Application filed by Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP0422344A2 publication Critical patent/EP0422344A2/en
Publication of EP0422344A3 publication Critical patent/EP0422344A3/en
Application granted granted Critical
Publication of EP0422344B1 publication Critical patent/EP0422344B1/en
Anticipated expiration legal-status Critical
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F9/00Rotary intaglio printing presses
    • B41F9/06Details
    • B41F9/08Wiping mechanisms
    • B41F9/10Doctors, scrapers, or like devices
    • B41F9/1036Clamping and adjusting devices
    • B41F9/1045Clamping and adjusting devices using fluid pressure

Definitions

  • the invention relates to a doctor blade device, the doctor blade of which is fastened in a doctor blade holder and can be adjusted to an ink-absorbing roller, preferably to the forme cylinder of a gravure printing machine.
  • doctor devices of this type there is the problem of being able to position the doctor knife along its length with even pressure against the roller even if the surface line of the roller on which or the area of which the doctor knife is supported is not exactly parallel to the cutting edge of the doctor knife. which is the case, for example, if the axis of the roller does not run parallel to the blade of the doctor blade or if the roller has a conical shape.
  • a part rotatable about the central axis which is rotatable about the pivot axis of the squeegee carrier, carries a pendulum axle journal bearing pair, the rotatable part of which carries the doctor blade holder and its central axis also in the middle of the doctor blade holder at a right angle to the central axis of the rotatable part.
  • a squeegee device known from DE-AS 12 28 276, the squeegee holders are carried by a rotatable squeegee carrier shaft equipped with rotating arms, which is mounted in independently rotatable swivel arms, both on the swivel arms and on the swivel arms in the direction of the forme cylinder effective, elastic force can be exercised.
  • This known squeegee device only works satisfactorily if the squeegee carrier shaft carrying the lever-like squeegee holder is not too long, because otherwise it can bend in its central region by an unacceptable amount, which then results in incomplete doctoring in the central region of the forme cylinder Has.
  • the object of the invention is therefore to provide a doctor device of the type mentioned, in which the doctor blade can be pressed against the roller with essentially the same pressure, regardless of the length of the doctor holder.
  • this object is achieved in a doctor blade device of the generic type in that the doctor blade holder or the like is provided by a plurality of pins or the like arranged at right angles to its longitudinal extent. rotatable with sled-like support pieces that run at right angles to the roller Guides are slidably guided, connected and pressed against the roller by a plurality of resilient pressing means distributed over its length, for example pressure medium piston-cylinder units.
  • the sled-like support pieces allow the doctor blade holder to be set against the roller with essentially the same pressure, the pins bearing the doctor blade holder relative to the support pieces allowing the doctor blade holder to be rotated accordingly to the support pieces.
  • the pressure means can be arranged in the desired manner over the length of the squeegee holder and act directly on this or also on the slide-like support pieces. Since any number of pressing means can be provided over the length of the doctor blade holder, even good doctor blades and associated doctor blade holders ensure a uniform, good and vibration-proof pressure, whereby the pin bearings ensure a tension-free inclination of the doctor blade holder in accordance with any oblique surface lines of the roller.
  • a pressing means is expediently assigned to each slide-like support piece.
  • the support pieces can be guided in guides of carriages which are provided with a drive which reciprocates the carriage parallel to the roller. This reversing drive prevents the doctor blade from constantly being in contact with the same peripheral areas of the roller.
  • the pressing means can consist of pneumatic piston-cylinder units, which are supported on the one hand on the doctor blade holder and on the other hand via holding pieces on the slide.
  • Two side walls of the frame are connected to one another by means of a crossbar 2.
  • Gear units 3 and 4 are screwed to the inner sides of each side wall 1, a motor 5 being assigned to the gear unit 4.
  • the gears 3 and 4 are connected to one another via a shaft 6.
  • the threaded spindles 7 and 8 which can be driven by the motor 5 via the gears 3 and 4 are held in the region of their ends remote from the gears 3 and 4 via brackets 9 and 10 connected to the side walls 1.
  • Bearings 11 and 12 equipped with threaded nuts, not shown, are placed on the threaded spindles 7 and 8.
  • a bearing journal 13 is rotatably held, which is firmly connected to one side of a cast frame 14.
  • a bearing journal 15 is also rotatably mounted in the bearing shown on the right side of FIG.
  • a clamping lever 16 is placed on the bearing pin 15 shown on the right in FIG. 1 and is fork-shaped on its side facing the viewer in FIG. 3.
  • a bolt 19 is rotatably mounted, which has a central threaded bore 20.
  • a threaded spindle 21 is screwed into this threaded bore and has a joint 22 at its lower end (FIG. 1). About this joint 22, the threaded spindle 21 is connected to a stub shaft 23 which is axially fixed but rotatable in a support profile 24.
  • the latter, namely the pulley 27, can be driven by a motor 28 which is firmly connected to the support profile 24.
  • the support profile 24 itself is attached to the bearing 12.
  • the two bearings 11 and 12 can consequently be raised and lowered, as a result of which the cast frame 14 can also be raised or lowered via the bearing pins 13 and 15.
  • the cast frame 14 can additionally be pivoted via the threaded spindle 21, the bolt 19 and the clamping lever 16.
  • the cast frame 14 has a plurality of supports 29 which are arranged at a distance from one another, two supports 29 each carrying an axis 30. Arms 31, which are firmly connected to the actual doctor holder 32, are supported on the three axes 30.
  • a further motor 33 is flanged to the casting frame 14, by means of which the squeegee holder 32 is opposite the Base frame 14 can be pivoted. This pivoting takes place in an analogous manner to the pivoting of the cast frame 14 via the motor 28, so that a further explanation is unnecessary.
  • a forme cylinder 34 and an impression roller 35 are shown in full lines in FIG.
  • the doctor blade 36 is attached to the forme cylinder 34 and is connected to the doctor holder 32 via clamping pieces 37 and a clamping claw 38.
  • the doctor blade can pass through the angle B, which has an influence on the degree of drying of the ink. (The farther the doctor blade is from the impression roller, the farther the path that the scraped cups of the forme cylinder have to travel to the impression roller, which results in a high degree of drying).
  • the doctor blade can be adjusted within the angle A by a corresponding method of the three motors mentioned, by which the degree of cell filling is defined. (The smaller the angle A, the greater the degree of filling of the cells).
  • FIGS. 4 to 6 differ from FIGS. 1 to 3 in that the arms 105 corresponding to the arms 31 additionally carry slides 107, 113 which are displaceable at right angles to one another, with the slide 113 on the Doctor blade holder 117 is supported by pins and is pressed onto the forme cylinder 120 by its own pressing means.
  • the cast frame 101 is mounted in the machine side frames in the manner described with reference to FIGS. 1 to 3, and is pivotably mounted.
  • This cast frame 101 has a plurality of supports 102, an axis 103 being pivotably mounted in two adjacent supports. The pivoting of this axis takes place via an adjustment device 104.
  • An arm 105 is clamped onto each axis 103, which has a guide profile 106 running in the direction of the axis 103.
  • a slide 107 is placed on each arm 105, which on its underside also has a guide profile 108 which runs in the longitudinal direction of the axis 103 and which engages in the guide profile 106.
  • a rodless cylinder unit 110 is connected to the arms 105 by means of a holder 109, the reciprocable pin 111 of which is connected to the carriage 107, whereby the latter can be reversed in the double arrow direction A. This reversing movement, which is only a few millimeters, is transferred to the doctor blade 112.
  • a further slide 113 is placed on the slide 107.
  • the carriage 107 has on its upper side two grooves 114 which run transversely to the axis 103 and into which guide strips 115 connected to the carriage 113 engage.
  • Each carriage 113 carries a guide pin 116, each of which protrudes into a bore in the doctor blade holder 117 with its end facing away from the carriage.
  • Each pivot 116 is rotatable with respect to the carriage 113 and the doctor holder 117.
  • the doctor blade 112 is clamped to the doctor holder 117 via a clamping piece 118 and the toggle screw 119.
  • the doctor blade 112 is pressed against the forme cylinder 120 via a pneumatic piston-cylinder unit 121, the cylinder 122 of which is firmly connected to the carriage 107 via an angle 123.
  • the doctor blade knife can evenly rest against the forme cylinder 120 even when it is in an inclined position.
  • the squeegee holder 117 is supported uniformly over its entire length, so that there is no fear of deflections. Even if only three bearing points for the squeegee holder 17 are shown in the exemplary embodiment shown, several can of course be provided if necessary without leaving the scope of the invention.

Description

Die Erfindung betrifft eine Rakelvorrichtung, deren in einem Rakelhalter befestigtes Rakelmesser an eine Farbe aufnehmende Walze, vorzugsweise an den Formzylinder einer Tiefdruckmaschine, anstellbar ist.The invention relates to a doctor blade device, the doctor blade of which is fastened in a doctor blade holder and can be adjusted to an ink-absorbing roller, preferably to the forme cylinder of a gravure printing machine.

Bei Rakelvorrichtungen dieser Art besteht das Problem, das Rakelmesser auch dann über seine Länge mit gleichmäßigem Andruck an die Walze anstellen zu können, wenn die Mantellinie der Walze, auf die oder deren Bereich sich das Rakelmesser abstützt, nicht genau parallel zur Schneide des Rakelmessers ist, was beispielsweise dann der Fall ist, wenn die Achse der Walze nicht parallel zur Schneide des Rakelmessers verläuft oder die Walze eine konische Form besitzt.With doctor devices of this type, there is the problem of being able to position the doctor knife along its length with even pressure against the roller even if the surface line of the roller on which or the area of which the doctor knife is supported is not exactly parallel to the cutting edge of the doctor knife. which is the case, for example, if the axis of the roller does not run parallel to the blade of the doctor blade or if the roller has a conical shape.

Bei einer aus der DE-AS 12 73 540 bekannten Rakelvorrichtung soll ein guter Andruck der Rakel an einen Formzylinder dadurch erreicht werden, daß ein um die zur Schwenkachse des Rakelträgers rechtwinkelige Mittelachse drehbarer Teil eine Pendelachszapfenlagerpaarung trägt, deren drehbarer Teil den Rakelmesserhalter trägt und deren Mittelachse ebenfalls in der Mitte des Rakelmesserhalters in einem rechten Winkel zur Mittelachse des drehbaren Teils verläuft. Bei dieser Rakelvorrichtung läßt sich das Rakelmesser aufgrund der mittigen, pendelnden und wippenartigen Lagerung des Rakelhalters mit guter Parallelität an den Formzylinder andrücken. Dennoch ist diese bekannte Rakelvorrichtung nicht zufriedenstellend, da eine gute Anlage des Rakelmessers an den Mantel eines Formzylinders nur so lange gewährleistet ist, wie das Rakelmesser verhältnismäßig kurz ist. Denn bei längeren Rakelmessern und zugehörigen Rakelmesserhalterungen tritt wegen der mittigen Lagerung in deren Endbereichen ein Vibrieren auf, das eine unsaubere Abrakelung in den Endbereichen des Formzylinders zur Folge hat.In a squeegee device known from DE-AS 12 73 540, good pressure of the squeegee against a forme cylinder is to be achieved in that a part rotatable about the central axis, which is rotatable about the pivot axis of the squeegee carrier, carries a pendulum axle journal bearing pair, the rotatable part of which carries the doctor blade holder and its central axis also in the middle of the doctor blade holder at a right angle to the central axis of the rotatable part. With this doctor device the doctor blade presses against the forme cylinder with good parallelism due to the central, oscillating and rocker-like mounting of the doctor holder. Nevertheless, this known doctor device is unsatisfactory, since a good contact of the doctor knife with the jacket of a forme cylinder is only ensured as long as the doctor knife is relatively short. Because with longer doctor blades and associated doctor blade holders, vibrations occur because of the central bearing in their end regions, which results in an unclean doctor blade in the end regions of the forme cylinder.

Bei einer aus der DE-AS 12 28 276 bekannten Rakelvorrichtung sind die Rakelhalter von einer verdrehbaren, mit Dreharmen ausgerüsteten Rakelträgerwelle getragen, die in unabhängig voneinander verdrehbaren Schwenkarmen gelagert ist, wobei sowohl auf die Schwenkarme als auch auf die Dreharme eine in Richtung auf den Formzylinder hin wirksame, elastische Kraft ausübbar ist. Auch diese bekannte Rakelvorrichtung arbeitet nur zufriedenstellend, wenn die die hebelartigen Rakelhalter tragende Rakelträgerwelle nicht zu lang ist, weil diese sich andernfalls in ihrem mittleren Bereich um ein nicht mehr vertretbares Maß durchbiegen kann, was dann in dem mittleren Bereich des Formzylinders eine unvollständige Abrakelung zur Folge hat.In a squeegee device known from DE-AS 12 28 276, the squeegee holders are carried by a rotatable squeegee carrier shaft equipped with rotating arms, which is mounted in independently rotatable swivel arms, both on the swivel arms and on the swivel arms in the direction of the forme cylinder effective, elastic force can be exercised. This known squeegee device only works satisfactorily if the squeegee carrier shaft carrying the lever-like squeegee holder is not too long, because otherwise it can bend in its central region by an unacceptable amount, which then results in incomplete doctoring in the central region of the forme cylinder Has.

Aufgabe der Erfindung ist es daher, eine Rakelvorrichtung der eingangs angegebenen Art zu schaffen, bei der sich das Rakelmesser unabhängig von der Länge des Rakelhalters mit im wesentlichen gleichem Andruck an die Walze andrücken läßt.The object of the invention is therefore to provide a doctor device of the type mentioned, in which the doctor blade can be pressed against the roller with essentially the same pressure, regardless of the length of the doctor holder.

Erfindungsgemäß wird diese Aufgabe bei einer Rakelvorrichtung der gattungsgemäßen Art dadurch gelöst, daß der Rakelhalter durch mehrere im rechten Winkel zu seiner Längserstreckung angeordnete Zapfen o.dgl. drehbar mit schlittenartigen Tragstücken, die in rechtwinkelig zur Walze verlaufenden Führungen verschieblich geführt sind, verbunden und durch mehrere über seine Länge verteilte federnde Andrückmittel, beispielsweise Druckmittel-Kolben-Zylinder-Einheiten, an die Walze angedrückt ist.According to the invention, this object is achieved in a doctor blade device of the generic type in that the doctor blade holder or the like is provided by a plurality of pins or the like arranged at right angles to its longitudinal extent. rotatable with sled-like support pieces that run at right angles to the roller Guides are slidably guided, connected and pressed against the roller by a plurality of resilient pressing means distributed over its length, for example pressure medium piston-cylinder units.

Die schlittenartigen Tragstücke gestatten es, daß sich der Rakelhalter mit im wesentlichen gleichen Andruck an die Walze anstellen läßt, wobei die den Rakelhalter relativ zu den Tragstücken lagernden Zapfen eine entsprechende Verdrehung des Rakelhalters zu den Tragstücken gestatten. Die Andruckmittel können in der gewünschten Weise über die Länge des Rakelhalters angeordnet werden und unmittelbar auf diesen oder aber auch auf die schlittenartigen Tragstücke wirken. Da über die Länge des Rakelhalters beliebig viele Andrückmittel vorgesehen werden können, ist auch bei sehr langen Rakelmessern und zugehörigen Rakelmesserhalterungen ein gleichmäßiger guter und vibrationssicherer Andruck gewährleistet, wobei aufgrund der Zapfenlagerungen eine verspannungsfreie Schrägstellung des Rakelmesserhalters entsprechend eventuell schräg verlaufenden Mantellinien der Walze sichergestellt ist.The sled-like support pieces allow the doctor blade holder to be set against the roller with essentially the same pressure, the pins bearing the doctor blade holder relative to the support pieces allowing the doctor blade holder to be rotated accordingly to the support pieces. The pressure means can be arranged in the desired manner over the length of the squeegee holder and act directly on this or also on the slide-like support pieces. Since any number of pressing means can be provided over the length of the doctor blade holder, even good doctor blades and associated doctor blade holders ensure a uniform, good and vibration-proof pressure, whereby the pin bearings ensure a tension-free inclination of the doctor blade holder in accordance with any oblique surface lines of the roller.

Zweckmäßigerweise ist jedem schlittenartigen Tragstück ein Andrückmittel zugeordnet. Die Tragstücke können in Führungen von Schlitten geführt sein, die mit einem den Schlitten parallel zur Walze hin- und herbewegenden Antrieb versehen sind. Dieser reversierende Antrieb verhindert, daß das Rakelmesser ständig mit denselben Umfangsbereichen der Walze in Berührung bleibt.A pressing means is expediently assigned to each slide-like support piece. The support pieces can be guided in guides of carriages which are provided with a drive which reciprocates the carriage parallel to the roller. This reversing drive prevents the doctor blade from constantly being in contact with the same peripheral areas of the roller.

Die Andrückmittel können aus pneumatischen Kolben-Zylinder-Einheiten bestehen, die sich einerseits auf dem Rakelhalter und andererseits über Haltestücke auf den Schlitten abstützen.The pressing means can consist of pneumatic piston-cylinder units, which are supported on the one hand on the doctor blade holder and on the other hand via holding pieces on the slide.

Ein Ausführungsbeispiel der Erfindung wird nachstehend anhand der Zeichnung näher beschrieben. In dieser zeigt

Fig.1
eine Vorderansicht einer Rakelvorrichtung, teilweise im Schnitt,
Fig.2
einen Schnitt durch die Rakelvorrichtung längs der Linie II-II in Fig.1,
Fig.3
eine Draufsicht auf die Rakelvorrichtung in Richtung der Pfeile III in Fig. 1,
Fig.4
eine der Fig.1 entsprechende Darstellung der Rakelvorrichtung mit der erfindungsgemäßen Lagerung des Rakelhalters,
Fig.5
einen Ausschnitt aus der Rakelhalterung gemäß Fig.4 in vergrößerter Darstellung und
Fig.6
eine Ansicht der Rakelhalterung gemäß der Linie III-III in Fig.5.
An embodiment of the invention is described below with reference to the drawing. In this shows
Fig. 1
2 shows a front view of a doctor device, partly in section,
Fig. 2
2 shows a section through the doctor device along the line II-II in FIG. 1,
Fig. 3
2 shows a plan view of the doctor device in the direction of arrows III in FIG. 1,
Fig. 4
1 shows a representation of the doctor device with the bearing of the doctor holder according to the invention,
Fig. 5
a section of the doctor holder according to Figure 4 in an enlarged view and
Fig. 6
a view of the doctor holder according to the line III-III in Figure 5.

Zwei Seitenwände des Gestells sind mittels einer Quertraverse 2 miteinander verbunden. Mit den Innenseiten einer jeden Seitenwand 1 sind Getriebe 3 und 4 verschraubt, wobei dem Getriebe 4 ein Motor 5 zugeordnet ist. Über eine Welle 6 sind die Getriebe 3 und 4 miteinander verbunden. Die vom Motor 5 über die Getriebe 3 und 4 antreibbaren Gewindespindeln 7 und 8 sind im Bereich ihrer von den Getrieben 3 und 4 entfernt liegenden Enden über mit den Seitenwänden 1 verbundenen Konsolen 9 und 10 gehalten. Auf die Gewindespindeln 7 und 8 sind mit nicht dargestellten Gewindemuttern ausgestattete Lager 11 und 12 aufgesetzt. In dem auf der linken Seite der Figur 1 dargestellten Lager 11 ist ein Lagerzapfen 13 drehbar gehalten, der mit einer Seite eines Gußrahmens 14 fest verbunden ist. Ebenso wie in dem Lager 11 ist auch in dem auf der rechten Seite der Figur 1 dargestellten Lager ein Lagerzapfen 15 drehbar gelagert, der an seinem dem Lager 12 abgewandten Ende mit der rechten Seite des Gußrahmens 14 fest verbunden ist. Auf den in der Figur 1 rechts dargestellten Lagerzapfen 15 ist ein Klemmhebel 16 aufgesetzt, der an seiner in Figur 3 dem Betrachter zugewandten Seite gabelförmig ausgebildet ist. In den beiden Gabelarmen 17 und 18 ist ein Bolzen 19 drehbar gelagert, der eine mittige Gewindebohrung 20 aufweist. In diese Gewindebohrung ist eine Gewindespindel 21 eingeschraubt, die an ihrem unteren Ende (Figur 1) ein Gelenk 22 aufweist. Über dieses Gelenk 22 ist die Gewindespindel 21 mit einem Wellenstummel 23 verbunden, der in einem Tragprofil 24 axial fest aber drehbar gelagert ist. Auf das dem Gelenk 22 entfernt liegenden Ende des Wellenstummels 23 ist eine Riemenscheibe 25 aufgesetzt, die über einen Keilriemen 26 mit einer weiteren Riemenscheibe 27 verbunden ist. Letztere, nämlich die Riemenscheibe 27, ist über einen Motor 28 antreibbar, der mit dem Tragprofil 24 fest verbunden ist. Das Tragprofil 24 selbst ist an dem Lager 12 befestigt.Two side walls of the frame are connected to one another by means of a crossbar 2. Gear units 3 and 4 are screwed to the inner sides of each side wall 1, a motor 5 being assigned to the gear unit 4. The gears 3 and 4 are connected to one another via a shaft 6. The threaded spindles 7 and 8 which can be driven by the motor 5 via the gears 3 and 4 are held in the region of their ends remote from the gears 3 and 4 via brackets 9 and 10 connected to the side walls 1. Bearings 11 and 12 equipped with threaded nuts, not shown, are placed on the threaded spindles 7 and 8. In the bearing 11 shown on the left side of FIG. 1, a bearing journal 13 is rotatably held, which is firmly connected to one side of a cast frame 14. As well As in the bearing 11, a bearing journal 15 is also rotatably mounted in the bearing shown on the right side of FIG. A clamping lever 16 is placed on the bearing pin 15 shown on the right in FIG. 1 and is fork-shaped on its side facing the viewer in FIG. 3. In the two fork arms 17 and 18, a bolt 19 is rotatably mounted, which has a central threaded bore 20. A threaded spindle 21 is screwed into this threaded bore and has a joint 22 at its lower end (FIG. 1). About this joint 22, the threaded spindle 21 is connected to a stub shaft 23 which is axially fixed but rotatable in a support profile 24. A pulley 25, which is connected to a further pulley 27 by means of a V-belt 26, is placed on the end of the shaft end 23 that is distant from the joint 22. The latter, namely the pulley 27, can be driven by a motor 28 which is firmly connected to the support profile 24. The support profile 24 itself is attached to the bearing 12.

Durch Einschalten des Motors 5 können demzufolge die beiden Lager 11 und 12 hoch- und heruntergefahren werden, wodurch über die Lagerzapfen 13 und 15 auch der Gußrahmen 14 angehoben bzw. abgesenkt werden kann. Durch zusätzliches Einschalten des Motors 28 (Figur 3) kann der Gußrahmen 14 zusätzlich noch über die Gewindespindel 21, den Bolzen 19 und den Klemmhebel 16 verschwenkt werden.By switching on the motor 5, the two bearings 11 and 12 can consequently be raised and lowered, as a result of which the cast frame 14 can also be raised or lowered via the bearing pins 13 and 15. By additionally switching on the motor 28 (FIG. 3), the cast frame 14 can additionally be pivoted via the threaded spindle 21, the bolt 19 and the clamping lever 16.

Der Gußrahmen 14 weist mehrere mit Abstand voneinander angeordnete Stützen 29 auf, wobei jeweils zwei Stützen 29 eine Achse 30 tragen. Auf den drei Achsen 30 lagern Arme 31, die mit dem eigentlichen Rakelhalter 32 fest verbunden sind. Wie die Figur 1 erkennen läßt, ist and den Gußrahmen 14 ein weiterer Motor 33 angeflanscht, über den der Rakelhalter 32 gegenüber dem Grundrahmen 14 verschwenkt werden kann. Diese Verschwenkung geschieht in analoger Weise zu der Verschwenkung des Gußrahmens 14 über den Motor 28, so daß sich eine weitere Erläuterung erübrigt.The cast frame 14 has a plurality of supports 29 which are arranged at a distance from one another, two supports 29 each carrying an axis 30. Arms 31, which are firmly connected to the actual doctor holder 32, are supported on the three axes 30. As can be seen in FIG. 1, a further motor 33 is flanged to the casting frame 14, by means of which the squeegee holder 32 is opposite the Base frame 14 can be pivoted. This pivoting takes place in an analogous manner to the pivoting of the cast frame 14 via the motor 28, so that a further explanation is unnecessary.

In der Figur 2 sind ein Formzylinder 34 und ein Presseur 35 jeweils mit vollen Linien dargestellt. An den Formzylinder 34 ist das Rakelmesser 36 angestellt, welches über Klemmstücke 37 und einer Spannpratze 38 mit dem Rakelhalter 32 verbunden ist. Durch entsprechendes Anfahren der Motore 5,28 und 33 kann zum einen das Rakelmesser den Winkel B durchfahren, der Einfluß auf den Trocknungsgrad der Farbe hat. (Je weiter das Rakelmesser vom Presseur entfernt ist, desto weiter ist der Weg, den die abgerakelten Näpfchen des Formzylinders zum Presseur zurücklegen müssen, wodurch ein hoher Trocknungsgrad erzielt wird). Weiterhin kann durch entsprechendes Verfahren der genannten drei Motore das Rakelmesser innerhalb des Winkels A eingestellt werden, durch den der Näpfchenfüllgrad definiert wird. (Je kleiner der Winkel A ist, desto größer ist der Füllgrad der Näpfchen).A forme cylinder 34 and an impression roller 35 are shown in full lines in FIG. The doctor blade 36 is attached to the forme cylinder 34 and is connected to the doctor holder 32 via clamping pieces 37 and a clamping claw 38. By appropriately starting the motors 5, 28 and 33, the doctor blade can pass through the angle B, which has an influence on the degree of drying of the ink. (The farther the doctor blade is from the impression roller, the farther the path that the scraped cups of the forme cylinder have to travel to the impression roller, which results in a high degree of drying). Furthermore, the doctor blade can be adjusted within the angle A by a corresponding method of the three motors mentioned, by which the degree of cell filling is defined. (The smaller the angle A, the greater the degree of filling of the cells).

Die Erfindung wird nunmehr anhand der Fig. 4 bis 6 erläutert, die sich von den Fig.1 bis 3 dadurch unterscheiden, daß die den Armen 31 entsprechenden Arme 105 zusätzlich relativ zueinander rechtwinkelig verschiebliche Schlitten 107, 113 tragen, wobei auf dem Schlitten 113 der Rakelhalter 117 durch Zapfen gelagert und durch eigene Andrückmittel an den Formzylinder 120 angedrückt ist.The invention will now be explained with reference to FIGS. 4 to 6, which differ from FIGS. 1 to 3 in that the arms 105 corresponding to the arms 31 additionally carry slides 107, 113 which are displaceable at right angles to one another, with the slide 113 on the Doctor blade holder 117 is supported by pins and is pressed onto the forme cylinder 120 by its own pressing means.

Bei dem Ausführungsbeispiel nach den Fig.4 bis 6 ist der Gußrahmen 101 in der anhand der Fig.1 bis 3 beschriebenen Weise in Maschinenseitengestellen auf- und abbewegbar sowie schwenkbar gelagert.In the exemplary embodiment according to FIGS. 4 to 6, the cast frame 101 is mounted in the machine side frames in the manner described with reference to FIGS. 1 to 3, and is pivotably mounted.

Dieser Gußrahmen 101 weist mehrere Stützen 102 auf, wobei in jeweils zwei benachbarten Stützen eine Achse 103 verschwenkbar gelagert ist. Das Verschwenken dieser Achse geschieht über eine Verstelleinrichtung 104. Auf jede Achse 103 ist ein Arm 105 aufgeklemmt, der ein in Richtung der Achse 103 verlaufendes Führungsprofil 106 aufweist. Auf jeden Arm 105 ist ein Schlitten 107 aufgesetzt, der an seiner Unterseite ebenfalls ein in Längsrichtung der Achse 103 verlaufendes Führungsprofil 108 aufweist, das in das Führungsprofil 106 eingreift. Über Halter 109 ist mit den Armen 105 eine kolbenstangenlose Zylindereinheit 110 verbunden, dessen hin- und herbewegbarer Zapfen 111 mit dem Schlitten 107 verbunden ist, wodurch letzterer in Doppelpfeilrichtung A hin- und herreversierbar ist. Diese Reversierbewegung, die nur wenige Millimeter beträgt, überträgt sich auf das Rakelmesser 112.This cast frame 101 has a plurality of supports 102, an axis 103 being pivotably mounted in two adjacent supports. The pivoting of this axis takes place via an adjustment device 104. An arm 105 is clamped onto each axis 103, which has a guide profile 106 running in the direction of the axis 103. A slide 107 is placed on each arm 105, which on its underside also has a guide profile 108 which runs in the longitudinal direction of the axis 103 and which engages in the guide profile 106. A rodless cylinder unit 110 is connected to the arms 105 by means of a holder 109, the reciprocable pin 111 of which is connected to the carriage 107, whereby the latter can be reversed in the double arrow direction A. This reversing movement, which is only a few millimeters, is transferred to the doctor blade 112.

Wie aus den Figuren 5 und 6 weiterhin zu erkennen ist, ist auf den Schlitten 107 ein weiterer Schlitten 113 aufgesetzt. Zu diesem Zweck weist der Schlitten 107 an seiner oberen Seite zwei quer zur Achse 103 verlaufende Nuten 114 auf, in die mit dem Schlitten 113 verbundene Führungsleisten 115 eingreifen. Jeder Schlitten 113 trägt einen Führungszapfen 116, wobei jeder mit seinem dem Schlitten abgewandten Ende in eine Bohrung des Rakelhalters 117 hineinragt. Jeder Drehzapfen 116 ist sowohl gegenüber dem Schlitten 113 und dem Rakelhalter 117 drehbar. Wie insbesondere aus der Figur 6 gut zu erkennen ist, ist das Rakelmesser 112 über ein Klemmstück 118 und die Knebelschraube 119 mit dem Rakelhalter 117 verklemmt.As can also be seen from FIGS. 5 and 6, a further slide 113 is placed on the slide 107. For this purpose, the carriage 107 has on its upper side two grooves 114 which run transversely to the axis 103 and into which guide strips 115 connected to the carriage 113 engage. Each carriage 113 carries a guide pin 116, each of which protrudes into a bore in the doctor blade holder 117 with its end facing away from the carriage. Each pivot 116 is rotatable with respect to the carriage 113 and the doctor holder 117. As can be seen particularly well from FIG. 6, the doctor blade 112 is clamped to the doctor holder 117 via a clamping piece 118 and the toggle screw 119.

Der Andruck des Rakelmessers 112 an den Formzylinder 120 geschieht über eine pneumatische Kolben-Zylinder-Einheit 121, dessen Zylinder 122 über einen Winkel 123 fest mit dem Schlitten 107 verbunden ist.The doctor blade 112 is pressed against the forme cylinder 120 via a pneumatic piston-cylinder unit 121, the cylinder 122 of which is firmly connected to the carriage 107 via an angle 123.

Aufgrund der vorstehend beschriebenen Lagerung der Rakelhalterung 117 kann sich einerseits das Rakelmesser selbst bei Schräglage des Formzylinders 120 gleichmäßig an diesen anlegen. Andererseits ist die Rakelhalterung 117 über ihre gesamte Länge gleichmäßig abgestützt, so daß Durchbiegungen nicht zu befürchten sind. Wenn auch in dem dargestellten Ausführungsbeispiel nur drei Lagerpunkte für die Rakelhalterung 17 dargestellt sind, so können selbstverständlich bei Bedarf mehrere vorgesehen sein, ohne den Erfindungsrahmen zu verlassen.Because of the above-described mounting of the doctor blade holder 117, on the one hand the doctor blade knife can evenly rest against the forme cylinder 120 even when it is in an inclined position. On the other hand, the squeegee holder 117 is supported uniformly over its entire length, so that there is no fear of deflections. Even if only three bearing points for the squeegee holder 17 are shown in the exemplary embodiment shown, several can of course be provided if necessary without leaving the scope of the invention.

Claims (4)

  1. A doctor blade device whose doctor blade mounted in a doctor blade holder can be placed against a roller taking up ink, preferably the plate cylinder of an intaglio printing machine,
    characterized in that
    the doctor blade holder (117) is rotatably connected by several pins (116) or the like, arranged at right angles to its longitudinal span to the same number of carriage-type supporting members (113) which are carried for displacement in guideways (114, 115) extending at right angles to the roller (120), and which is pressed onto the roller (120) by several sprung pressing-on means, for example, pressure-medium piston cylinder units (121) which are distributed over its length.
  2. A doctor blade device according to claim 1, characterized in that to each carriage-type supporting member (113), there is assigned a pressing-on means (121).
  3. A doctor blade device according to claim 1 or 2, characterized in that the supporting members (113) are carried in guideways (114, 115) by carriages (107) which are provided with a drive (110) moving the carriage (107) to and fro parallel to the roller (120).
  4. A doctor blade device according to one of claims 1 to 3, characterized in that the pressing-on means consist of pneumatic piston-cylinder units (121) which bear on one side on the doctor blade holder (117) and on the other side via holding members (123) on the carriage (107).
EP90114725A 1989-10-10 1990-07-31 Doctor blade device Expired - Lifetime EP0422344B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3933844 1989-10-10
DE3933844A DE3933844A1 (en) 1989-10-10 1989-10-10 Squeegee device

Publications (3)

Publication Number Publication Date
EP0422344A2 EP0422344A2 (en) 1991-04-17
EP0422344A3 EP0422344A3 (en) 1991-06-05
EP0422344B1 true EP0422344B1 (en) 1993-10-20

Family

ID=6391214

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90114725A Expired - Lifetime EP0422344B1 (en) 1989-10-10 1990-07-31 Doctor blade device

Country Status (4)

Country Link
US (1) US5136941A (en)
EP (1) EP0422344B1 (en)
CA (1) CA2026858A1 (en)
DE (2) DE3933844A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4130118C2 (en) * 1991-09-11 1995-04-20 Jagenberg Ag Device for coating a web of material guided around a counter roller, in particular a paper or cardboard web
DE4340867C2 (en) * 1993-12-01 1996-08-14 Roland Man Druckmasch Device for starting and stopping a squeegee device on an application roller in rotary printing machines
US5584243A (en) * 1996-01-05 1996-12-17 Austrian Machine Corporation Conversion kit for a gravure printing unit
JP4711495B2 (en) 2000-08-08 2011-06-29 スリーエム イノベイティブ プロパティズ カンパニー Coating device
WO2008141694A1 (en) 2007-04-27 2008-11-27 Bobst Sa Doctor blade system for a printing unit, intended for an intaglio printing machine

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2057689B1 (en) * 1970-11-24 1971-12-16 Maschf Augsburg Nuernberg Ag Device on rotary printing machines to control the contact pressure of a doctor blade
US3783781A (en) * 1971-09-20 1974-01-08 S Grommek Doctor blade control mechanism, particularly for use in printing presses
DE3020306C2 (en) * 1980-05-29 1982-11-11 M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach Ink knife for an ink fountain roller of printing machines
SE442969B (en) * 1981-12-14 1986-02-10 Wifag Maschf DOSAGE KNIFE
US4638733A (en) * 1984-01-20 1987-01-27 Horst Rebhan Squeegee head for printing of bodies by the screen printing method
US4773327A (en) * 1987-04-09 1988-09-27 Am International Ink metering blade

Also Published As

Publication number Publication date
CA2026858A1 (en) 1991-04-11
US5136941A (en) 1992-08-11
DE3933844A1 (en) 1991-04-18
DE59003148D1 (en) 1993-11-25
EP0422344A3 (en) 1991-06-05
EP0422344A2 (en) 1991-04-17

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