EP0053298A1 - Doctor blade mechanism - Google Patents

Doctor blade mechanism Download PDF

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Publication number
EP0053298A1
EP0053298A1 EP81109435A EP81109435A EP0053298A1 EP 0053298 A1 EP0053298 A1 EP 0053298A1 EP 81109435 A EP81109435 A EP 81109435A EP 81109435 A EP81109435 A EP 81109435A EP 0053298 A1 EP0053298 A1 EP 0053298A1
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EP
European Patent Office
Prior art keywords
pressure
pressure medium
piston
doctor
doctor blade
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP81109435A
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German (de)
French (fr)
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EP0053298B1 (en
Inventor
Ludger Ottenhues
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
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Windmoeller and Hoelscher KG
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Publication of EP0053298A1 publication Critical patent/EP0053298A1/en
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Publication of EP0053298B1 publication Critical patent/EP0053298B1/en
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    • 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

Definitions

  • the invention relates to a doctor blade device with a doctor blade which can be adjusted to a forme cylinder and is fixed in a doctor blade holder and which is provided with devices for adjusting its pressure, which can be varied over its length.
  • a number of spindles which are supported with their front ends directly on the squeegee knife and are axially displaceable but non-rotatably guided in rotatably mounted rings, whereby the spindles are rotated
  • a remote control is provided around endless belts rotating by means of magnets or pneumatically controlled pressure rollers for frictionally entraining the rings can be pressed against their jackets and the spindles for operating manual actuation buttons on their rear ends.
  • the known device not only has a complicated structure, it is also difficult and difficult to reproduce to handle and does not allow a sufficiently sensitive adjustment of the pressure means which press the doctor blade with different pressure.
  • this object is achieved in that the. Holder of the doctor blade with a parallel to this support is pivotally connected by at least one leaf spring that several pressure medium piston-cylinder units are arranged in a row on the support, the piston rods of which are attached to the support or to a part connected to it that the pressure medium-piston-cylinder units are supplied with a pressure medium with an adjustable basic pressure and that each of the pressure medium-piston-cylinder units is assigned a separately adjustable fine control valve, via which an additional pressure is added to the basic pressure by feeding in additional pressure medium overlays.
  • the pivoting mounting of the doctor blade holder used in the combination according to the invention enables flexible adjustment of the doctor blade to the forme cylinder, since undesirable tension in rigid bearings, which would have to be compensated for by the flexibility of the doctor blade, is avoided.
  • the spaced along the length Pressure medium-piston-cylinder units distributed in the holder of the doctor blade initially apply equal pressure forces to the holder, which can be varied in sections in the desired manner over the length of the doctor knife by the fine control valve.
  • the section-by-section fine adjustment can be controlled manually by remote control or automatically according to a predefined program.
  • the pressure force of the doctor blade against the forme cylinder can be measured by suitable transducers and the fine control valves can be controlled according to the measured values.
  • Air, but also hydraulic fluid, can preferably be used as the pressure medium.
  • a doctor device in which piston-cylinder units are provided with the stepped piston for placing the doctor blades on and off the forme cylinder Larger piston ring area is acted upon by a pressure medium controlling the switch-on and switch-off movements and a pressure medium for simultaneous and uniform readjustment of the doctor blades can be fed to a smaller piston surface divided by seals, independently of the devices for controlling the switch-on and switch-off movements. A different pressure cannot be exerted with the two last-mentioned doctor devices over the length of the doctor knife.
  • the leaf spring carries at its end opposite the holder a clamping piece which can be inserted into a corresponding receptacle of the carrier and is held in this by a locking device actuated by at least one pressure medium piston-cylinder unit.
  • a locking device actuated by at least one pressure medium piston-cylinder unit.
  • a doctor blade 2 with a doctor blade 2.1 is applied, which is held between a doctor bar 3 and a bar 4.
  • a leaf spring 5 is connected, which is perpendicular to the doctor bar 3.
  • the lower free end of the leaf spring 5, which extends over the entire length of the doctor blade, is clamped between two strips 6 and 7 of the same length.
  • the strips 6 and 7 lie in a groove 8 of a rail 9, which has the same length as the squeegee.
  • Four pressure medium cylinders 10 are fastened to the rail 9, on the piston rod of which a pressure piece 11 with a wedge surface 12 is seated.
  • the strip 7 has a wedge angle matching the wedge surface 12.
  • the piston of the pressure medium cylinder 10 is shown in the extended state, so that the pressure piece 11 presses the strips 6, 7 into the corner of the groove 8 diametrically opposite the wedge surface 12.
  • a pressure spring 13 is arranged in front of the piston of the pressure medium cylinder 10 and pushes the piston to the right when the pressure of the pressure medium is switched off. In the depressurized state, the strips 6, 7 are free, so that the squeegee can be easily removed from its working position by means of the handles 14.
  • a bar 15 is fixedly connected, which is fastened to the doctor carrier (not shown), with which the right and left side plates 15.1 and the deflector plate 15.2 are connected, and on which five pressure medium cylinders 16 are arranged, the piston rod of which is via a in a guide piece 17 guided pressure pin 18 acts on the underside of the doctor bar 3.
  • Pressure medium cylinder 16 with a pressure medium, a force is exerted on the doctor bar 3, which presses the doctor blade 2 against the forme cylinder 1 while bending the leaf spring 5.
  • These contact forces can be freely selected in terms of their size and position, so that, for example, the two pressure medium cylinders 16 on the left exert a strong force and the rest only a weak force.
  • a control of the pressure medium cylinders 16 is shown in the pneumatic maintenance plan in FIG. 4.
  • the control consists of five fine control valves 21 for each of the pressure medium cylinders 16 and a fine control valve 22 with which a basic value for the pneumatic pressure for the fine control valves 21 is set.
  • the pressure medium pressure can be switched on and off with a control slide 23.
  • a slide 24 is connected upstream of the control slide 23.
  • a pressure medium source 25 is connected to this with a line 26 for the pressure medium cylinders 16 and with lines 27 which lead to the pressure medium cylinders 10.
  • the fine control valves 21 are supplied with pressure medium via lines 28, 29, 30.
  • By means of an adjusting screw 31 on the fine control valve 21, a pressure can be set which is supplied to the pressure medium cylinders 16 via lines 32.
  • the fine control valve 22 feeds pressure medium into the fine control valves 21 via lines 33, 34, 35, which is superimposed on the pressure in the lines 32.
  • a fine pressure is thus preselected by the fine control valve 22, which can be changed upwards for each individual pressure medium cylinder 16 by means of the adjusting screws 31. In this way, the force of the squeegee can be adjusted in sections as desired.
  • the knife When changing the doctor blade, the knife is first turned off with slide 23 and then the lock is released with slide 24. After replacing and re-setting the knife, the old pressure conditions are restored.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Rotary Presses (AREA)
  • Coating Apparatus (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

Eine Rakelvorrichtung mit einem an einem Formzylinder (1) anstellbaren und in einem Rakelhalter festgelegten Rakelmesser (2) ist mit Einrichtungen zur Einstellung seines über seine Länge unterschiedlich veränderbaren Andrucks versehen. Um die Einstellung unterschiedlicher Andrückkräfte über die Länge des Rakelmessers (2) zu ermöglichen, ist die Halterung (3, 4) des Rakelmessers (2) mit einem zu diesem parallel verlaufenden Träger (15) durch mindestens eine Blattfeder (5) schwenkbar verbunden. Auf dem Träger (15) sind in einer Reihe mehrere Druckmittel-Kolben-Zylinder-Einheiten (16) angeordnet, deren Kolbenstangen unmittelbar oder mittelbar über Druckbolzen (18) an die Halterung (3, 4) oder an einen mit dieser verbundenden Teil angestellt sind. Die Druckmittel-Kolben-Zylinder-Einheiten (16) sind mit einem Druckmittel mit einem einstellbaren Grunddruck gespeist und jeder der Druckmittel-Kolben-Zylinder-Einheiten (16) ist ein getrennt einstellbares Feinregelventil (21) zugeordnet, über das sich durch Einspeisen von zusätzlichem Druckmittel dem Grunddruck ein zusätzlicher Druck überlagern läßt.A doctor device with a doctor knife (2) which can be set on a forme cylinder (1) and fixed in a doctor holder is provided with devices for adjusting its pressure, which can be varied over its length. In order to enable the setting of different pressing forces over the length of the doctor blade (2), the holder (3, 4) of the doctor blade (2) is pivotably connected to a carrier (15) running parallel to it by at least one leaf spring (5). Arranged in a row on the carrier (15) are a plurality of pressure medium piston-cylinder units (16), the piston rods of which are attached directly or indirectly via pressure bolts (18) to the holder (3, 4) or to a part connected to the latter . The pressure medium-piston-cylinder units (16) are supplied with a pressure medium with an adjustable basic pressure and each of the pressure medium-piston-cylinder units (16) is assigned a separately adjustable fine control valve (21), via which additional can be fed in Pressure medium can overlay the basic pressure with an additional pressure.

Description

Die Erfindung betrifft eine Rakelvorrichtung mit einem an einen Formzylinder anstellbaren und in einem Rakelhalter festgelegten Rakelmesser, das mit Einrichtungen zur Einstellung seines über seine Länge unterschiedlich veränderbaren Andrucks versehen ist.The invention relates to a doctor blade device with a doctor blade which can be adjusted to a forme cylinder and is fixed in a doctor blade holder and which is provided with devices for adjusting its pressure, which can be varied over its length.

Bei einer aus der DE-PS 11 42 877 bekannten Rakelvorrichtung dieser Art ist eine Reihe von sich mit ihren vorderen Enden unmittelbar auf das Rakelmesser abstützenden Spindeln vorgesehen, die in drehbar gelagerten Ringen axial verschieblich, aber undrehbar geführt sind, wobei zur Verdrehung der Spindeln durch eine Fernsteuerung um Umlenkrollen umlaufende endlose Bänder vorgesehen sind, die durch magnetisch oder pneumatisch gesteuerte Andruckrollen zur reibschlüssigen Mitnahme der Ringe gegen deren Mäntel andrückbar sind und wobei die Spindeln zur Handbetätigung an ihren rückwärtigen Enden Betätigungsknöpfe tragen. Die bekannte Vorrichtung weist nicht nur einen komplizierten Aufbau auf, sie ist auch schwierig und schlecht reproduzierbar zu handhaben und gestattet keine genügend feinfühlige Einstellung der das Rakelmesser mit unterschiedlichem Druck beaufschlagenden Andrückmittel.In a squeegee device of this type known from DE-PS 11 42 877, a number of spindles which are supported with their front ends directly on the squeegee knife and are axially displaceable but non-rotatably guided in rotatably mounted rings, whereby the spindles are rotated A remote control is provided around endless belts rotating by means of magnets or pneumatically controlled pressure rollers for frictionally entraining the rings can be pressed against their jackets and the spindles for operating manual actuation buttons on their rear ends. The known device not only has a complicated structure, it is also difficult and difficult to reproduce to handle and does not allow a sufficiently sensitive adjustment of the pressure means which press the doctor blade with different pressure.

Aufgabe der Erfindung ist es daher, eine Rakelvorrichtung der eingangs angegebenen Art zu schaffen, die bei einfachem Aufbau und leichter Handhabungsmöglichkeit in erforderlichenfalls auch reproduzierbarer Weise die Einstellung unterschiedlicher Andrückkräfte über die Länge des Rakelmessers gestattet.It is therefore an object of the invention to provide a doctor device of the type specified at the outset which, with a simple structure and easy handling, in a reproducible manner, if necessary, allows the setting of different pressing forces over the length of the doctor knife.

Erfindungsgemäß wird diese Aufgabe dadurch gelöst, daß die. Halterung des Rakelmessers mit einem zu diesem parallel verlaufenden Träger durch mindestens eine Blattfeder schwenkbar verbunden ist, daß auf dem Träger in einer Reihe mehrere Druckmittel-Kolben-Zylinder-Einheiten angeordnet sind, deren Kolbenstangen an den Träger oder an einen mit diesem verbundenen Teil angestellt sind, daß die Druckmittel-Kolben-Zylinder-Einheiten mit einem Druckmittel mit einem einstellbaren Grunddruck gespeist sind und daß jeder der Druckmittel-Kolben-Zylinder-Einheiten ein getrennt einstellbares Feinregelventil zugeordnet ist, über das sich durch Einspeisen von zusätzlichem Druckmittel dem Grunddruck ein zusätzlicher Druck überlagern läßt. Die in der erfindungsgemäßen Kombination verwendete, aus Blattfedern bestehende schwenkbare Lagerung der Halterung des Rakelmessers ermöglicht eine flexible Anpassung des Rakelmessers an den Formzylinder, da unerwünschte Verspannungen in formsteifen Lagern, die durch die Flexibilität des Rakelmessers ausgeglichen werden müßten, vermieden sind. Die im Abstand über die Länge der Halterung des Rakelmessers verteilten Druckmittel-Kolben-Zylinder-Einheiten beaufschlagen zunächst einmal die Halterung mit gleichgroßen Andrückkräften, die jedoch durch das Feinregelventil in der gewünschten Weise abschnittweise über die Länge des Rakelmessers varriert werden können. Die abschnittweise Feineinstellung kann von Hand durch eine Fernsteuerung oder aber auch nach einem vorgegebenen Programm automatisch gesteuert werden. Schließlich kann die Andrückkraft des Rakelmessers an den Formzylinder durch geeignete Wandler gemessen und die Feinregelventile entsprechend den Meßwerten gesteuert werden. Als Druckmittel kann vorzugsweise Luft, aber auch Hydraulikflüssigkeit verwendet werden.According to the invention this object is achieved in that the. Holder of the doctor blade with a parallel to this support is pivotally connected by at least one leaf spring that several pressure medium piston-cylinder units are arranged in a row on the support, the piston rods of which are attached to the support or to a part connected to it that the pressure medium-piston-cylinder units are supplied with a pressure medium with an adjustable basic pressure and that each of the pressure medium-piston-cylinder units is assigned a separately adjustable fine control valve, via which an additional pressure is added to the basic pressure by feeding in additional pressure medium overlays. The pivoting mounting of the doctor blade holder used in the combination according to the invention, consisting of leaf springs, enables flexible adjustment of the doctor blade to the forme cylinder, since undesirable tension in rigid bearings, which would have to be compensated for by the flexibility of the doctor blade, is avoided. The spaced along the length Pressure medium-piston-cylinder units distributed in the holder of the doctor blade initially apply equal pressure forces to the holder, which can be varied in sections in the desired manner over the length of the doctor knife by the fine control valve. The section-by-section fine adjustment can be controlled manually by remote control or automatically according to a predefined program. Finally, the pressure force of the doctor blade against the forme cylinder can be measured by suitable transducers and the fine control valves can be controlled according to the measured values. Air, but also hydraulic fluid, can preferably be used as the pressure medium.

Die Lagerung einer Halterung für ein Rakelmesser auf Blattfedern ist an sich aus der DE-AS 19 64 118 bekannt. Diese bekannte Lagerung ist aber keine Schwenklagerung, sondern sie dient lediglich der reibungsfreien Abstützung der Halterung senkrecht zur Rakelbewegung, wobei die Halterung an ihrer Rückseite in Richtung der Rakelbewegung auf eine Druckmeßeinrichtung abgestützt ist, die am Rakelstuhl befestigt ist.The storage of a holder for a doctor blade on leaf springs is known per se from DE-AS 19 64 118. However, this known mounting is not a swivel mounting, but rather serves only for the frictionless support of the holder perpendicular to the squeegee movement, the holder being supported on its back in the direction of the squeegee movement on a pressure measuring device which is attached to the squeegee chair.

Aus der GB-PS 13 16 105 ist eine wippenartige Lagerung der Halterung eines Rakelmessers um eine zur Formzylinderachse parallele Achse bekannt, wobei beidseits der Lagerung zwischen die Halterung und dem diese lagernden Träger aufblasbare flexible Schläuche gelegt sind, durch deren Aufblasen sich der Andruck des Rakelmessers an dem Formzylinder variieren läßt.From GB-PS 13 16 105 a rocker-like mounting of the holder of a doctor blade about an axis parallel to the forme cylinder axis is known, wherein on both sides of the support inflatable flexible tubes are placed, by inflating the pressure of the doctor knife can vary on the forme cylinder.

Schließlich ist aus der DE-PS 20 57 689 eine Rakelvorrichtung bekannt, bei der zum An-und Abstellen der Rakeln an den Formzylinder mit den Rakelträgern verbundene Kolben-Zylinder-Einheiten vorgesehen sind, die Stufenkolben aufweisen, wobei die größere Kolbenringfläche von einem die An- und Abstellbewegungen steuernden Druckmittel beaufschlagt und einer kleineren, durch Dichtungen abgeteilten Kolbenfläche unabhängig von den Einrichtungen zur Steuerung der An- und Abstellbewegungen ein Druckmittel zum gleichzeitigen und gleichmäßigen Nachstellen der Rakeln zuführbar ist. Ein unterschiedlicher Druck läßt sich mit den beiden zuletzt genannten Rakeleinrichtungen nicht über die Länge des Rakelmessers ausüben.Finally, from DE-PS 20 57 689 a doctor device is known, in which piston-cylinder units are provided with the stepped piston for placing the doctor blades on and off the forme cylinder Larger piston ring area is acted upon by a pressure medium controlling the switch-on and switch-off movements and a pressure medium for simultaneous and uniform readjustment of the doctor blades can be fed to a smaller piston surface divided by seals, independently of the devices for controlling the switch-on and switch-off movements. A different pressure cannot be exerted with the two last-mentioned doctor devices over the length of the doctor knife.

In erfinderischer Weiterbildung ist vorgesehen, daß die Blattfeder an ihrem der Halterung gegenüberliegenden Ende ein Klemnstück trägt, das in eine entsprechende Aufnahme des Trägers einsetzbar und in dieser durch eine von mindestens einer Druckmittel-Kolben-Zylinder-Einheit betätigten Verriegelungseinrichtung festgehalten ist. Zum Wechsel der Rakelhalterung mit dem Rakelmesser ist es lediglich erforderlich, nach dem Abstellen des Rakelmessers von dem Formzylinder die Druckmittel-Kolben-Zylinder-Einheit zu betätigen und die Rakelhalterung gegen eine andere auszutauschen. Der Austausch läßt sichbbesondera schnell und einfach vornehnen, wenn die Druckmittel-Kolben-Zylinder-Einheit gespeist ist. Die erfindungsgemäße Vorrichtung ermöglicht somit nicht nur einen gewünschten unterschiedlichen Andruck des Rakelmessers über dessen Länge, die Halterung mit dem Rakelmesser läßt sich auch in besonders einfacher und schneller Weise gegen eine neue austauschen, wobei die Andrückverhältnisse des Rakelmessers einfach reproduzierbar sind.In an inventive further development, it is provided that the leaf spring carries at its end opposite the holder a clamping piece which can be inserted into a corresponding receptacle of the carrier and is held in this by a locking device actuated by at least one pressure medium piston-cylinder unit. To change the squeegee holder with the squeegee knife, it is only necessary to actuate the pressure medium-piston-cylinder unit after the squeegee knife has been switched off from the forme cylinder and to replace the squeegee holder with another one. The exchange can be carried out particularly quickly and easily when the pressure medium-piston-cylinder unit is supplied. The device according to the invention thus not only enables the doctor blade knife to be pressed differently along its length, the holder with the doctor blade can also be exchanged for a new one in a particularly simple and rapid manner, the pressure conditions of the doctor blade being easily reproducible.

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

  • Fig. 1 einen Schnitt durch die Rakelvorrichtung entlang der Linie I-I in Fig. 2,
  • Fig. 2 einen Schnitt durch die Rakelvorrichtung entlang der Linie II - II in Fig. 3,
  • Fig. 3 eine Ansicht auf die Rakelvorrichtung in Richtung des Pfeils X in Fig. 1 und
  • Fig. 4 einen Pneumatikschaltplan.
An embodiment of the invention is explained below with reference to the drawing. In this shows
  • 1 shows a section through the doctor device along the line II in Fig. 2,
  • 2 shows a section through the doctor device along the line II-II in FIG. 3,
  • Fig. 3 is a view of the doctor device in the direction of arrow X in Fig. 1 and
  • Fig. 4 is a pneumatic circuit diagram.

An einen Formzylinder 1 ist ein Rakelmesser 2 mit Stützrakel 2.1 einer Rakel angestellt, das zwischen einem Rakelbalken 3 und einer Leiste 4 festgehalten wird. Mit der Leiste 4 ist eine Blattfeder 5 verbunden, die senkrecht zum Rakelbalken 3 steht. Das untere freie Ende der Blattfeder 5, die sich über die gesamte Länge der Rakel erstreckt, ist zwischen zwei Leisten 6 und 7 gleicher Länge eingespannt. Die Leisten 6 und 7 liegen in einer Nut 8 einer Schiene 9, die die gleiche Länge wie die Rakel aufweist. An der Schiene 9 sind vier Druckmittelzylinder 10 befestigt, auf deren Kolbenstange ein Druckstück 11 mit einer Keilfläche 12 sitzt. Die Leiste 7 weist einen zur Keilfläche 12 passenden Keilwinkel auf. In Fig. 1 ist der Kolben des Druckmittelzylinders 10 im ausgefahrenen Zustand gezeigt, so daß das Druckstück 11 die Leisten 6, 7 in die der Keilfläche 12 diametral gegenüberliegende Ecke der Nut 8 drückt. Vor dem Kolben des Druckmittelzylinders 10 ist eine Druckfeder 13 angeordnet, die den Kolben nach rechts schiebt, wenn der Druck des Druckmittels abgeschaltet wird. Im drucklosen Zustand sind die Leisten 6, 7 frei, so daB die Rakel aus ihrer Arbeitsposition mittels der Handgriffe 14 leicht entfernt werden kann. Mit der Schiene 9 ist eine Leiste 15 fest verbunden, die auf dem nicht dargestellten Rakelträger befestigt ist, mit der auch die rechts und links angeordneten Seitenbleche 15.1 sowie das Abweisblech 15.2 verbunden sind, und auf der fünf Druckmittelzylinder 16 angeordnet sind, deren Kolbenstange über einen in einem Führungsstück 17 geführten Druckbolzen 18 auf die Unterseite des Rakelbalkens 3 wirkt. Durch Beaufschlagen des ; Druckmittelzylinders 16 mit einem Druckmittel wird eine Kraft auf den Rakelbalken 3 ausgeübt, die das Rakelmesser 2 unter Verbiegung der Blattfeder 5 gegen den Formzylinder 1 anpreßt. Diese Anpreßkräfte können in ihrer Größe und Lage frei gewählt werden, so daß beispielsweise die beiden links liegenden Druckmittelzylinder 16 eine starke Kraft und die übrigen lediglich eine schwache Kraft ausüben.On a forme cylinder 1, a doctor blade 2 with a doctor blade 2.1 is applied, which is held between a doctor bar 3 and a bar 4. With the bar 4, a leaf spring 5 is connected, which is perpendicular to the doctor bar 3. The lower free end of the leaf spring 5, which extends over the entire length of the doctor blade, is clamped between two strips 6 and 7 of the same length. The strips 6 and 7 lie in a groove 8 of a rail 9, which has the same length as the squeegee. Four pressure medium cylinders 10 are fastened to the rail 9, on the piston rod of which a pressure piece 11 with a wedge surface 12 is seated. The strip 7 has a wedge angle matching the wedge surface 12. 1, the piston of the pressure medium cylinder 10 is shown in the extended state, so that the pressure piece 11 presses the strips 6, 7 into the corner of the groove 8 diametrically opposite the wedge surface 12. A pressure spring 13 is arranged in front of the piston of the pressure medium cylinder 10 and pushes the piston to the right when the pressure of the pressure medium is switched off. In the depressurized state, the strips 6, 7 are free, so that the squeegee can be easily removed from its working position by means of the handles 14. With the rail 9, a bar 15 is fixedly connected, which is fastened to the doctor carrier (not shown), with which the right and left side plates 15.1 and the deflector plate 15.2 are connected, and on which five pressure medium cylinders 16 are arranged, the piston rod of which is via a in a guide piece 17 guided pressure pin 18 acts on the underside of the doctor bar 3. By loading the ; Pressure medium cylinder 16 with a pressure medium, a force is exerted on the doctor bar 3, which presses the doctor blade 2 against the forme cylinder 1 while bending the leaf spring 5. These contact forces can be freely selected in terms of their size and position, so that, for example, the two pressure medium cylinders 16 on the left exert a strong force and the rest only a weak force.

Eine Steuerung der Druckmittelzylinder 16 zeigt der Pneumatiksohaltplan Fig. 4. Die Steuerung besteht aus fünf Feinregelventilen 21 für jeden der Druckmittelzylinder 16 und aus einem Feinregelventil 22, mit dem ein Grundwert für den Pneumatikdruck für die Feinregelventile 21 eingestellt wird. Mit einem Steuerschieber 23 kann der Druckmitteldruck zu- und abgeschaltet werden. Dem Steuerschieber 23 ist ein Schieber 24 vorgeschaltet. Mit diesem wird eine Druckmittelquelle 25 mit einer Leitung 26 für die Druckmittelzylinder 16 und mit Leitungen27 verbunden, die zu den Druckmittelzylindern 10 führen. Über Leitungen 28, 29, 30 werden die Feinregelventile 21 mit Druckmittel versorgt. Durch eine Einstellschraube 31 am Feinregelventil 21 kann ein Druck eingestellt werden, der über Leitungen 32 den Druckmittelzylindern 16 zugeführt wird. Durch das Feinregelventil 22 wird über Leitungen 33, 34, 35 Druckmittel in die Feinregelventile 21 eingespeist, der sich dem Druck in den Leitungen 32 überlagert. Durch das Feinregelventil 22 wird also ein Grunddruck vorgewählt, der mittels der Stellschrauben 31 für jeden einzelnen Druckmittelzylinder 16 nach oben verändert werden kann. Dadurch läßt sich die Kraft des Rakels abschnittsweise beliebig verstellen.A control of the pressure medium cylinders 16 is shown in the pneumatic maintenance plan in FIG. 4. The control consists of five fine control valves 21 for each of the pressure medium cylinders 16 and a fine control valve 22 with which a basic value for the pneumatic pressure for the fine control valves 21 is set. The pressure medium pressure can be switched on and off with a control slide 23. A slide 24 is connected upstream of the control slide 23. A pressure medium source 25 is connected to this with a line 26 for the pressure medium cylinders 16 and with lines 27 which lead to the pressure medium cylinders 10. The fine control valves 21 are supplied with pressure medium via lines 28, 29, 30. By means of an adjusting screw 31 on the fine control valve 21, a pressure can be set which is supplied to the pressure medium cylinders 16 via lines 32. The fine control valve 22 feeds pressure medium into the fine control valves 21 via lines 33, 34, 35, which is superimposed on the pressure in the lines 32. A fine pressure is thus preselected by the fine control valve 22, which can be changed upwards for each individual pressure medium cylinder 16 by means of the adjusting screws 31. In this way, the force of the squeegee can be adjusted in sections as desired.

Beim Wechseln des Rakelmessers wird zunächst mit Schieber 23 das Messer abgestellt und dann mit Schieber 24 die Verriegelung gelöst. Nach dem Austauschen und erneutem Anstellen des Messers stellen sich die alten Andrückverhältnisse wieder ein.When changing the doctor blade, the knife is first turned off with slide 23 and then the lock is released with slide 24. After replacing and re-setting the knife, the old pressure conditions are restored.

Claims (4)

1. Rakelvorrichtung mit einem an einem Formzylinder anstellbaren und in einem Rakelhalter festgelegten Rakelmesser, das mit Einrichtungen zur Einstellung seines über seine Länge unterschiedlich veränderbaren Andrucks versehen ist, dadurch gekennzeichnet, daß die Halterung (3, 4) des Rakelmessers (2) mit einem zu diesem parallel verlaufenden Träger (15) durch mindestens eine Blattfeder (5) schwenkbar verbunden ist, daß auf dem Träger (15) in einer Reihe mehrere Druckmittel-Kolben-Zylinder-Einheiten (16) angeordnet sind, deren Kolbenstangen unmittelbar oder mittelbar über Druckbolzen (18) an die Halterung (3,4) oder an einen mit dieser verbundenen Teil angestellt sind, daß die Druckmittel-Kolben-Zylinder-Einheiten (16) mit einem Druckmittel mit einem einstellbaren Grunddruck gespeist sind und daß jeder der Druckmittel-Kolben-Zylinder-Einheiten (16) ein getrennt einstellbares Feinregelventil (21) zugeordnet ist, über das sich durch Einspeisen von zusätzlichem Druckmittel dem Grunddruck ein zusätzlicher Druck überlagern läßt.1. Doctor device with an adjustable on a forme cylinder and fixed in a doctor blade doctor blade, which is provided with means for adjusting its pressure, which can be varied over its length, characterized in that the holder (3, 4) of the doctor blade (2) with one this parallel carrier (15) is pivotally connected by at least one leaf spring (5), that a plurality of pressure medium piston-cylinder units (16) are arranged on the carrier (15) in a row, the piston rods of which are directly or indirectly via pressure bolts ( 18) are attached to the holder (3, 4) or to a part connected thereto that the pressure medium piston-cylinder units (16) are supplied with a pressure medium with an adjustable basic pressure and that each of the pressure medium piston cylinders Units (16) a separately adjustable fine control valve (21) is assigned, via which an additional pressure can be superimposed on the basic pressure by feeding in additional pressure medium. 2. Rakelvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Blattfeder (5) etwa rechtwinkelig zu dem Rakelmesser (2) an der Halterung (3, 4) befestigt ist und daß sich die Kolbenstangen oder Druckbolzen (18) auf eine die Befestigung der Blattfeder (5) an der Halterung überkragende, Hebel bildende Leiste abstützen.2. Doctor device according to claim 1, characterized in that the leaf spring (5) is attached approximately at right angles to the doctor blade (2) on the holder (3, 4) and that the piston rods or pressure bolts (18) on a fastening of the leaf spring (5) Support the cantilever-forming strip on the bracket. 3. Rakelvorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Blattfeder an ihrem der Halterung (3,4) gegenüberliegenden Ende ein Klemmstück (6) trägt, das in eine entsprechende Aufnahme (8) des Trägers (9,15) einsetzbar und in dieser durch eine von mindestens einer Druckmittel-Kolben-Zylinder-Einheit (10) betätigte Verriegelungseinrichtung (11, 12) festgehalten ist.3. Doctor device according to claim 1 or 2, characterized in that the leaf spring carries at its end opposite the holder (3, 4) a clamping piece (6) which can be inserted into a corresponding receptacle (8) of the carrier (9, 15) and is held in this by a locking device (11, 12) actuated by at least one pressure medium-piston-cylinder unit (10). 4. Rakelvorrichtung nach Anspruch 3, dadurch gekennzeichnet, daß die Druckmittel-Kolben-Zylinder-Einheit (10) der Verriegelungseinrichtung von derselben Druckmittelleitung (26) wie die das Rakelmesser (2) andrückenden Druckmittel-Kolben-Zylinder-Einheiten (16) gespeist ist.4. Doctor device according to claim 3, characterized in that the pressure medium piston-cylinder unit (10) of the locking device from the same pressure medium line (26) as the doctor blade (2) pressing the pressure medium piston-cylinder units (16) is fed .
EP81109435A 1980-12-01 1981-10-30 Doctor blade mechanism Expired EP0053298B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3045191 1980-12-01
DE3045191 1980-12-01
DE3101300 1981-01-16
DE3101300A DE3101300C2 (en) 1980-12-01 1981-01-16 Squeegee device

Publications (2)

Publication Number Publication Date
EP0053298A1 true EP0053298A1 (en) 1982-06-09
EP0053298B1 EP0053298B1 (en) 1984-10-03

Family

ID=25789447

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81109435A Expired EP0053298B1 (en) 1980-12-01 1981-10-30 Doctor blade mechanism

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Country Link
US (1) US4463675A (en)
EP (1) EP0053298B1 (en)
DE (1) DE3101300C2 (en)

Cited By (2)

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US4716826A (en) * 1984-08-01 1988-01-05 Officine Meccaniche Giovanni Cerutti S.P.A. Instantaneous adjustment device for a dotoring blade assembly operatively linked to a cylinder in a printing press
DE4213662A1 (en) * 1992-04-25 1993-10-28 Koenig & Bauer Ag Method for placing a chambered doctor blade on an ink-emitting roller and device for carrying out the method

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DE3217569C2 (en) * 1982-05-11 1985-11-28 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Method and device for metering the ink in offset printing machines
JPH0796293B2 (en) * 1986-12-29 1995-10-18 東芝精機株式会社 Ink supply amount adjustment device for printing machine
US4817524A (en) * 1986-12-31 1989-04-04 The Boeing Company Screen printing method and apparatus
DE3713433A1 (en) * 1987-04-22 1988-11-03 Werner Grossmann DEVICE FOR REMOVING DIRTY PARTICLES FROM THE PLATE CYLINDER OF AN OFFSET PRINTING MACHINE
US5226363A (en) * 1990-09-11 1993-07-13 The Langston Corporation Dual pressure preload system for maintaining a member
JP2540682B2 (en) * 1991-12-03 1996-10-09 株式会社コムテック Soil removal device for offset printing machine
US5410961A (en) 1992-12-30 1995-05-02 Fit Group, Inc. Fountain assembly
US5575076A (en) * 1994-07-13 1996-11-19 Methode Electronics, Inc. Circuit board testing fixture with registration plate
US5738724A (en) * 1996-08-06 1998-04-14 Westvaco Corporation Actuator assembly for coater blade load adjustment

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GB168933A (en) * 1920-04-14 1921-09-14 John Hooper Butler Improvements relating to inking mechanism for printing machines
US3271808A (en) * 1964-06-08 1966-09-13 Lodding Engineering Corp Power operated doctor blade holder
US3559229A (en) * 1968-12-19 1971-02-02 Allis Chalmers Mfg Co Doctor assembly
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DE2601339A1 (en) * 1976-01-15 1977-07-21 Maschf Augsburg Nuernberg Ag INSERTION DEVICE FOR A GRAVURE PRINTING MACHINE

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Publication number Priority date Publication date Assignee Title
US4716826A (en) * 1984-08-01 1988-01-05 Officine Meccaniche Giovanni Cerutti S.P.A. Instantaneous adjustment device for a dotoring blade assembly operatively linked to a cylinder in a printing press
DE4213662A1 (en) * 1992-04-25 1993-10-28 Koenig & Bauer Ag Method for placing a chambered doctor blade on an ink-emitting roller and device for carrying out the method
US5388515A (en) * 1992-04-25 1995-02-14 Koenig & Bauer Aktiengesellschaft Method and apparatus for placement of a doctor blade against an ink-dispensing roller

Also Published As

Publication number Publication date
DE3101300A1 (en) 1982-07-22
US4463675A (en) 1984-08-07
DE3101300C2 (en) 1983-03-17
EP0053298B1 (en) 1984-10-03

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