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EP0551797B1 - Metering strip - Google Patents

Metering strip Download PDF

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Publication number
EP0551797B1
EP0551797B1 EP92811018A EP92811018A EP0551797B1 EP 0551797 B1 EP0551797 B1 EP 0551797B1 EP 92811018 A EP92811018 A EP 92811018A EP 92811018 A EP92811018 A EP 92811018A EP 0551797 B1 EP0551797 B1 EP 0551797B1
Authority
EP
European Patent Office
Prior art keywords
metering
cylindrically shaped
shaped end
metering strip
strip according
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
EP92811018A
Other languages
German (de)
French (fr)
Other versions
EP0551797A1 (en
Inventor
Herbert Dipl.-Ing. Janser
Eugen Zwahlen
Peter Gertsch
Robert Imhof
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.)
Wifag Maschinenfabrik AG
Original Assignee
Wifag Maschinenfabrik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Wifag Maschinenfabrik AG filed Critical Wifag Maschinenfabrik AG
Publication of EP0551797A1 publication Critical patent/EP0551797A1/en
Application granted granted Critical
Publication of EP0551797B1 publication Critical patent/EP0551797B1/en
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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B41PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41FPRINTING MACHINES OR PRESSES
    • B41F31/00Inking arrangements or devices
    • B41F31/20Ink-removing or collecting devices
    • 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
    • B41F9/1072Blade construction

Definitions

  • the present invention relates to a metering bar for an inking unit of a printing press according to the preamble of claim 1.
  • a paper web to be printed is passed between two rotating cylinders of the printing press inking unit and printed on it. At least one of these two cylinders is designed as a blanket cylinder, to which the printing ink is transferred via further upstream rotating cylinders or rollers of the inking unit.
  • the printing ink which can be highly viscous, is applied to the first of these rollers and - if necessary via further rollers - is transported to the blanket cylinder mentioned.
  • the inking roller can be partially immersed in an ink bath in order to entrain ink when rotating, or a suitable inking device can be arranged over the entire width of the inking roller.
  • the ink film formed in this way on the inking roller must then be adjusted to the desired thickness by an appropriate metering device. This is usually done by means of a so-called doctor blade or a squeegee, which extends along the entire length of the ink application roller used for ink transfer and is pressed against the roller.
  • a metering device for the inking unit of a printing press for stripping a pre-metered ink film on an inking roller to the size required for the subsequent transfer to a forme cylinder is known from DE-C 37 14 936.
  • This metering device has at least one metering bar which extends along the inking roller and is pressed against this roller.
  • the metering bar is essentially radial to the inking roller, so that a metering gap is formed between the roller and the end of the metering bar facing the roller.
  • the end of the metering bar facing the roller is cylindrical in shape.
  • the metering bar can be pivoted about the axis of the cylinder, which is defined by the cylindrically shaped end is.
  • the metering bar In order to enable the metering bar to pivot about this axis within a limited angular range, the metering bar is mounted in a holder on its end faces via bearing pins, the axis of rotation of which coincides with the axis of the cylinder defined by the rounded end.
  • the embodiments of metering strips disclosed by this document and the metering devices including such metering strips, including the aforementioned holder for the metering strip, are assumed to be known.
  • a disadvantage of the metering strip known from DE-C 37 14 936 has been found to be that only a relatively small pivoting angle of less than 30 °, i.e. ⁇ 15 ° around the central axis is permitted, otherwise the width of the metering gap between the roller and the metering bar would increase inadmissibly if the metering bar were to be pivoted further. This would result in an undesirable change in the layer thickness of the paint applied to the roller.
  • the more viscous the printing ink used the more advantageous it is to pivot away by a larger angle than the aforementioned 30 °. If the metering bar is only pivoted slightly, there is a jam in the edge area between the roller and the metering bar, especially when using highly viscous printing ink, of the ink stripped from the metering bar and running freely.
  • DE-C 37 14 936 further proposes that dosing ends be spanned with a flexible, sheet-like plate which is fastened in such a way that it can be replaced easily and simply.
  • the wear resistance is thus paid for by a higher design effort which, in addition to the film-like, wear-resistant plate, requires additional locking devices for this plate.
  • the invention has therefore set itself the task of a metering bar for an inking unit of a printing machine while avoiding the create disadvantages known from the prior art; in particular, this metering bar with a simple structure, defining an exact metering gap, is intended to ensure the free flow of the stripped, superfluous paint applied to the paint application roller, especially when using highly viscous paint.
  • the advantage of the present invention is based on the fact that the cylindrically shaped end of a metering bar facing an inking roller covers an angular range of more than 180 ° and adjoins the cylindrically shaped end on both sides of the metering bar, axially extending recesses. Since the cylindrical end of the metering strip according to the invention covers a much larger angular range than the solutions known from the prior art, the angular range around which such a metering strip can be pivoted can be effectively increased without the undesirable side effect that the cylindrical end of the metering strip is moved away from the surface of the inking roller, which would result in an undesirable widening of the gap.
  • a swiveling of the metering strip by an angle as large as possible is desirable in order to facilitate the free flow of the ink.
  • a metering bar designed according to the invention can be pivoted through an angle of almost ⁇ 90 ° out of the normal position directed radially to the inking roller. Since the metering strip according to the invention can be pivoted within a large angular range, a comparatively large amount of friction work can be brought about by oscillating movement of the metering strip, in particular to produce highly viscous paint in the area of Distribute the point of contact between the inking roller and metering bar evenly.
  • the recesses adjoining the cylindrically shaped end of the metering strip according to the invention ensure that the stripped paint can flow backward from this cylindrical end into the recesses and from there along the adjoining part of the metering strip serving as a guide for the color back into a paint collecting container .
  • the fact that the recesses connect to the cylindrically shaped end also ensures the desired large swivel range of the metering bar.
  • the advantage brought about constructively by the invention is further promoted by a wear-resistant design of the cylindrical end of the metering strip, since, for example, an over-tensioning of the cylindrical end with a wear-resistant, film-like plate can be dispensed with.
  • a metering strip spanned with such a plate would namely have a complicated structure in order to make the design-related advantages of the invention come into play.
  • the cylindrically shaped end of the metering strip according to the invention preferably covers an angular range between 200 ° and 280 °; A coverage of approximately 250 ° is particularly favorable.
  • transition area between the cylindrically shaped end of the metering strip and the recesses arranged on both sides is particularly advantageously continuously shaped, so that the cylindrical end runs in tangential extension into a rounded recess or groove, which in turn continuously merges into the adjoining part of the metering strip, where the stripped ink flows off to be collected in a pool or the like.
  • the metering strip can be formed in one piece, but on the other hand it can also consist of several parts, at least the cylindrical end, a part arranged in a pivotable holder, which protrudes from the cylindrical end into the holder, and a further part that receives the recess, which are suitably rigidly connected to one another.
  • the one-piece metering bar represents a particularly preferred embodiment, because in this case the highest dimensional accuracies, in particular over the entire length of the metering bar, can be achieved. Fitting problems due to the connection of several parts, for example when gluing or welding, can be avoided. This advantage of one-piece construction comes into play particularly in the case of a multi-page wide metering strip, such as is used for so-called panorama printing.
  • the shape of the metering strip according to the invention in the region of the contact point with the inking roller and the part projecting into the pivotable holder with recesses on both sides can be produced by shape grinding or milling, spark erosion or other suitable machining methods.
  • the metering strip can be made of a suitable solid material, but preferably only the cylindrically shaped end is designed to be wear-resistant by using a suitable material, such as, for example, ceramic, sintered metal or a wear-resistant plastic. It is also sufficient to merely make its surface wear-resistant, which can advantageously be done by applying a suitable layer, such as carbides, nitrides, oxides, etc.
  • the printing unit shown schematically in FIG. 3, of a known offset rotary machine has a blanket cylinder 1, against which an impression cylinder 2 is attached, but which can also be designed as a further blanket cylinder.
  • a paper web 3 to be printed is passed between blanket cylinder 1 and impression cylinder 2 and printed.
  • An inking roller 6 with an elastic surface is in contact with a plate cylinder 4, which is used to transfer the ink from the inking roller 6 to the blanket cylinder 1.
  • a pre-dosed ink film 8 which has a constant dimension over the entire width of the ink application roller 6 and whose thickness is many times greater than that of the ink film 9 that can be transferred to the plate cylinder 4, is created with an ink application device 7
  • an ink fountain 10 is provided, which is provided with an ink knife 11 which determines the dosage and is adjustable in a known manner.
  • a portion of the pre-dosed ink film 8, which is taken up by the inking roller 6, is then stripped off with a metering bar 12 arranged downstream of the inking device 7, which in its normal position is approximately vertical, ie. that is, approximately in the radial direction, to the inking roller 6.
  • the ink film 9 which can be transferred to the plate cylinder 4 has a constant thickness over the entire width of the inking roller 6 on. This thickness can be adjusted by placing the metering bar on the inking roller 6 to a greater or lesser extent, which can be done with known adjustment mechanisms, not shown.
  • Fig. 2 shows a section of the inking roller 6, which is in contact with the metering bar 12.
  • the inking roller 6 is provided with an elastic coating 16 and rotates in the direction of arrow D.
  • the metering bar 12 has a cylindrical surface at the end 13 facing the inking roller 6.
  • the axis 17 of this cylindrical surface is also the axis of rotation about which the metering bar 12 can be pivoted by the angle ⁇ .
  • FIG. 1 finally shows the metering strip 12 with an end 13 which is cylindrically shaped over an angular range W and has a radius R, to which axially extending recesses 14 formed on both sides of the metering strip 12 are connected.
  • the recesses 14 are essentially V-shaped, so that the cylindrically shaped part 13 merges into the recesses 14 on both sides approximately in a tangential extension.
  • the narrowest point of the metering bar 12, which is defined by the recesses 14 on both sides, is rounded to promote the outflow of the stripped printing ink.
  • this metering bar 12 represents an almost continuously running drain surface for the stripped printing ink.
  • the radius R of the cylindrically shaped end 13 of the metering bar 12 is in the range between 0.3 and 1.5 mm.
  • This cylindrical end covers an angular range W that is greater than 180 °. In the illustrated embodiment, this angular range W is approximately 250 °.
  • the metering strip 12 can, owing to its pronounced, namely 180 ° overlapping, cylindrical end 13 with the recesses adjoining this cylindrically shaped end 13 on both sides of the metering strip 14 can be pivoted in a wide angular range ⁇ and thereby enables almost any desired position to the inking roller 6.
  • the angular range ⁇ usable for pivoting the metering bar 12 can thus be almost ⁇ 90 °, based on the normal position, without the free discharge of the stripped ink film in undesirably affect.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Coating Apparatus (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
  • Saccharide Compounds (AREA)
  • Paper (AREA)
  • Soil Working Implements (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)

Abstract

A metering strip (12) for an inking unit of a printing machine for metering printing ink, in particular a scraper blade or a doctor blade, is fastened in a swivellable holder and has a cylindrical end (13) which has a radius in the range between 0.3 and 1.5 mm and which, pressed onto an inking roller (6), forms, with said roller, a metering gap for the printing ink to be metered. Axially running cutouts (14), formed on either side of the metering strip (12), adjoin the cylindrical, wear-resistant end (13) which covers an angular region of more than 180 DEG . <IMAGE>

Description

Die vorliegende Erfindung betrifft eine Dosierleiste für ein Farbwerk einer Druckmaschine gemäß dem Oberbegriff des Anspruchs 1.The present invention relates to a metering bar for an inking unit of a printing press according to the preamble of claim 1.

Bei bekannten Druckmaschinen wird eine zu bedruckende Papierbahn zwischen zwei rotierenden Zylindern des Druckmaschinenfarbwerks hindurchgeführt und dabei bedruckt. Zumindest einer dieser beiden Zylinder ist als Gummituchzylinder ausgebildet, auf den die Druckfarbe über weitere vorgeschaltete rotierende Zylinder bzw. Walzen des Farbwerks übertragen wird. Auf die erste dieser Walzen wird die Druckfarbe, die hochviskos sein kann, aufgebracht und - ggf. über weitere Walzen - zum genannten Gummituchzylinder transportiert. Zum Aufnehmen der Druckfarbe kann die Farbauftragswalze zum Teil in ein Druckfarbenbad eingetaucht sein, um beim Rotieren Farbe mitzureißen, oder es kann über die ganze Breite der Farbauftragswalze eine geeignete Farbauftragsvorrichtung angeordnet sein. Der auf diese Art gebildete Farbfilm auf der Farbauftragswalze muß dann durch eine entsprechende Dosiervorrichtung auf die gewünschte Dicke eingestellt werden. Dies geschieht üblicherweise durch eine sogenannte Schaberklinge oder ein Rakel, die bzw. das sich entlang der gesamten zur Farbübertragung genutzten Länge der Farbauftragswalze erstreckt und gegen die Walze gepreßt ist.In known printing presses, a paper web to be printed is passed between two rotating cylinders of the printing press inking unit and printed on it. At least one of these two cylinders is designed as a blanket cylinder, to which the printing ink is transferred via further upstream rotating cylinders or rollers of the inking unit. The printing ink, which can be highly viscous, is applied to the first of these rollers and - if necessary via further rollers - is transported to the blanket cylinder mentioned. To receive the printing ink, the inking roller can be partially immersed in an ink bath in order to entrain ink when rotating, or a suitable inking device can be arranged over the entire width of the inking roller. The ink film formed in this way on the inking roller must then be adjusted to the desired thickness by an appropriate metering device. This is usually done by means of a so-called doctor blade or a squeegee, which extends along the entire length of the ink application roller used for ink transfer and is pressed against the roller.

Eine Dosiervorrichtung für das Farbwerk einer Druckmaschine zum Abstreifen eines vordosierten Farbfilms auf einer Farbauftragswalze auf das für die nachfolgende Übertragung auf einen Formzylinder erforderliche Maß ist aus der DE-C 37 14 936 bekannt. Diese Dosiervorrichtung weist mindestens eine Dosierleiste auf, die sich längs der Farbauftragswalze erstreckt und gegen diese Walze gepreßt ist. Die Dosierleiste steht im wesentlichen radial zur Farbauftragswalze, so daß zwischen der Walze und dem der Walze zugewandten Ende der Dosierleiste ein Dosierspalt ausgebildet ist. Das der Walze zugewandte Ende der Dosierleiste ist zylindrisch geformt. Zur Veränderung des Anstellwinkels der Dosierleiste zur Walze ist die Dosierleiste um die Achse des Zylinders schwenkbar, der durch das zylindrisch geformte Ende definiert ist. Um ein Schwenken der Dosierleiste um diese Achse innerhalb eines begrenzten Winkelbereichs zu ermöglichen, ist die Dosierleiste an ihren Stirnseiten über Lagerzapfen, deren Drehachse mit der Achse des durch das zylinderförmig abgerundete Ende definierten Zylinders zusammenfällt, in einer Halterung gelagert. Die durch diese Druckschrift offenbarten Ausführungsformen von Dosierleisten und die solche Dosierleisten beinhaltenden Dosiervorrichtungen einschließlich der genannten Halterung für die Dosierleiste werden als bekannt vorausgesetzt.A metering device for the inking unit of a printing press for stripping a pre-metered ink film on an inking roller to the size required for the subsequent transfer to a forme cylinder is known from DE-C 37 14 936. This metering device has at least one metering bar which extends along the inking roller and is pressed against this roller. The metering bar is essentially radial to the inking roller, so that a metering gap is formed between the roller and the end of the metering bar facing the roller. The end of the metering bar facing the roller is cylindrical in shape. To change the angle of attack of the metering bar to the roller, the metering bar can be pivoted about the axis of the cylinder, which is defined by the cylindrically shaped end is. In order to enable the metering bar to pivot about this axis within a limited angular range, the metering bar is mounted in a holder on its end faces via bearing pins, the axis of rotation of which coincides with the axis of the cylinder defined by the rounded end. The embodiments of metering strips disclosed by this document and the metering devices including such metering strips, including the aforementioned holder for the metering strip, are assumed to be known.

Als nachteilig bei der aus der DE-C 37 14 936 bekannten Dosierleiste hat es sich erwiesen, daß konstruktiv bedingt nur ein verhältnismäßig kleiner Schwenkwinkel von weniger als 30°, d.h. ± 15° um die Mittelachse, gestattet ist, da sich anderenfalls bei weiterem Abschwenken der Dosierleiste die Breite des Dosierspalts zwischen der Walze und der Dosierleiste unzulässig vergrößern würde. Dies zöge eine nicht erwünschte Änderung der Schichtdicke der auf die Walze aufgebrachten Farbe nach sich. Andererseits jedoch ist ein Abschwenken um einen größeren Winkel als die erwähnten 30° um so vorteilhafter, je viskoser die verwendete Druckfarbe ist. Bei nur wenig abgeschwenkter Dosierleiste kommt es nämlich im Kantenbereich zwischen der Walze und der Dosierleiste, insbesondere bei Verwendung hochviskoser Druckfarbe, zu einem Stau der von der Dosierleiste abgestreiften und frei ablaufenden Farbe.A disadvantage of the metering strip known from DE-C 37 14 936 has been found to be that only a relatively small pivoting angle of less than 30 °, i.e. ± 15 ° around the central axis is permitted, otherwise the width of the metering gap between the roller and the metering bar would increase inadmissibly if the metering bar were to be pivoted further. This would result in an undesirable change in the layer thickness of the paint applied to the roller. On the other hand, however, the more viscous the printing ink used, the more advantageous it is to pivot away by a larger angle than the aforementioned 30 °. If the metering bar is only pivoted slightly, there is a jam in the edge area between the roller and the metering bar, especially when using highly viscous printing ink, of the ink stripped from the metering bar and running freely.

Um das sehr genau bearbeitete Dosierende der Dosierleiste zu schützen, wird in der DE-C 37 14 936 weiterhin vorgeschlagen, daß Dosierende mit einer biegsamen, folienartigen Platte zu überspannen, die derart befestigt ist, daß sie leicht und einfach ausgewechselt werden kann. Die Verschleißfestigkeit wird somit durch einen höheren konstruktiven Aufwand erkauft, der neben der folienartigen, verschleißfesten Platte zusätzliche Arretierungseinrichtungen für diese Platte erfordert.In order to protect the very precisely machined dosing end of the metering strip, DE-C 37 14 936 further proposes that dosing ends be spanned with a flexible, sheet-like plate which is fastened in such a way that it can be replaced easily and simply. The wear resistance is thus paid for by a higher design effort which, in addition to the film-like, wear-resistant plate, requires additional locking devices for this plate.

Die Erfindung hat es sich daher zur Aufgabe gemacht, eine Dosierleiste für ein Farbwerk einer Druckmaschine unter Vermeidung der aus dem Stand der Technik bekannten Nachteile zun schaffen; insbesondere soll diese Dosierleiste bei einfachem Aufbau, einen exakten Dosierspalt definierend, den freien Abfluß der abgestreiften, überflüssigen, auf der Farbauftragswalze aufgetragenen Farbe gewährleisten, besonders auch bei Verwendung hochviskoser Farbe.The invention has therefore set itself the task of a metering bar for an inking unit of a printing machine while avoiding the create disadvantages known from the prior art; in particular, this metering bar with a simple structure, defining an exact metering gap, is intended to ensure the free flow of the stripped, superfluous paint applied to the paint application roller, especially when using highly viscous paint.

Diese Aufgabe wird durch den Gegenstand des kennzeichnenden Teils des Anspruchs 1 gelöst.This object is achieved by the subject matter of the characterizing part of claim 1.

Die Unteransprüche sind auf weitere vorteilhafte und zweckmäßige, nicht glatt selbstverständliche Ausgestaltungen der Erfindung gerichtet.The subclaims are directed to further advantageous and expedient, not smoothly self-evident embodiments of the invention.

Der Vorteil der vorliegenden Erfindung liegt darin begründet, daß das einer Farbauftragswalze zugewandte, zylindrisch geformte Ende einer Dosierleiste einen Winkelbereich von mehr als 180° überdeckt und sich an das zylindrisch geformte Ende beidseitig an der Dosierleiste ausgebildete, axial verlaufende Ausnehmungen anschließen. Da das zylindrische Ende der erfindungsgemäßen Dosierleiste einen weitaus größeren Winkelbereich überdeckt, als die aus dem Stand der Technik vorbekannten Lösungen, kann der Winkelbereich, um den solch eine Dosierleiste schwenkbar ist, wirksam vergrößert werden, ohne die unerwünschte Nebenwirkung, daß das zylindrische Ende der Dosierleiste von der Oberfläche der Farbauftragswalze wegbewegt wird, wodurch sich eine unerwünschte Spaltverbreiterung ergeben würde. Gerade bei Verwendung hochviskoser Druckfarbe ist ein Abschwenken der Dosierleiste um einen möglichst großen Winkelbetrag erwünscht, um den freien Abfluß der Farbe zu erleichtern. Im Gegensatz zu den bekannten Dosierleisten kann eine gemäß der Erfindung ausgebildete Dosierleiste durchaus um einen Winkel von nahezu ± 90° aus der radial zu der Farbauftragswalze gerichteten Normallage geschwenkt werden. Da die erfindungsgemäße Dosierleiste innerhalb eines großen Winkelbereichs geschwenkt werden kann, läßt sich durch oszillierende Bewegung der Dosierleiste eine vergleichsweise große Reibarbeit aufbringen, um insbesondere hochviskose Farbe im Bereich der Berührungsstelle von Farbauftragswalze und Dosierleiste gleichmäßig zu verteilen. Die sich erfindungsgemäß an das zylindrisch geformte Ende der Dosierleiste anschließenden Ausnehmungen sorgen dafür, daß die abgestreifte Farbe rückstaufrei von diesem zylindrischen Ende in die Ausnehmungen und von dort entlang des sich anschließenden, als Führung für die Farbe dienenden Teils der Dosierleiste zurück in einen Farbsammelbehälter abfließen kann. Das sich die Ausnehmungen an das zylindrisch geformte Ende anschließen, sorgt ebenfalls für den gewünschten großen Schwenkbereich der Dosierleiste. Der durch die Erfindung konstruktiv herbeigeführte Vorteil wird durch eine verschleißfeste Ausführung des zylindrischen Endes der Dosierleiste weiter gefördert, da beispielsweise auf eine Überspannung des zylindrischen Endes mit einer verschleißfesten, folienartigen Platte verzichtet werden kann. Eine mit einer solchen Platte überspannte Dosierleiste würde nämlich einen komplizierten Aufbau aufweisen, um die konstruktiv bedingten Vorteile der Erfindung zum Tragen kommen zu lassen.The advantage of the present invention is based on the fact that the cylindrically shaped end of a metering bar facing an inking roller covers an angular range of more than 180 ° and adjoins the cylindrically shaped end on both sides of the metering bar, axially extending recesses. Since the cylindrical end of the metering strip according to the invention covers a much larger angular range than the solutions known from the prior art, the angular range around which such a metering strip can be pivoted can be effectively increased without the undesirable side effect that the cylindrical end of the metering strip is moved away from the surface of the inking roller, which would result in an undesirable widening of the gap. Especially when using highly viscous printing ink, a swiveling of the metering strip by an angle as large as possible is desirable in order to facilitate the free flow of the ink. In contrast to the known metering bars, a metering bar designed according to the invention can be pivoted through an angle of almost ± 90 ° out of the normal position directed radially to the inking roller. Since the metering strip according to the invention can be pivoted within a large angular range, a comparatively large amount of friction work can be brought about by oscillating movement of the metering strip, in particular to produce highly viscous paint in the area of Distribute the point of contact between the inking roller and metering bar evenly. The recesses adjoining the cylindrically shaped end of the metering strip according to the invention ensure that the stripped paint can flow backward from this cylindrical end into the recesses and from there along the adjoining part of the metering strip serving as a guide for the color back into a paint collecting container . The fact that the recesses connect to the cylindrically shaped end also ensures the desired large swivel range of the metering bar. The advantage brought about constructively by the invention is further promoted by a wear-resistant design of the cylindrical end of the metering strip, since, for example, an over-tensioning of the cylindrical end with a wear-resistant, film-like plate can be dispensed with. A metering strip spanned with such a plate would namely have a complicated structure in order to make the design-related advantages of the invention come into play.

Das zylindrisch geformte Ende der erfindungsgemäßen Dosierleiste überdeckt bevorzugterweise einen Winkelbereich zwischen 200° und 280°; besonders günstig ist eine Überdeckung von etwa 250°.The cylindrically shaped end of the metering strip according to the invention preferably covers an angular range between 200 ° and 280 °; A coverage of approximately 250 ° is particularly favorable.

Besonders vorteilhaft ist der Übergangsbereich zwischen dem zylindrisch geformten Ende der Dosierleiste und den beidseitig angeordneten Ausnehmungen kontinuierlich geformt, so daß das zylindrische Ende in tangentialer Verlängerung in eine gerundete Ausnehmung bzw. Auskehlung einläuft, die ihrerseits wiederum kontinuierlich übergeht in den sich anschließenden Teil der Dosierleiste, an dem die abgestreifte Druckfarbe abfließt, um in einem Sammelbecken oder dgl. aufgefangen zu werden.The transition area between the cylindrically shaped end of the metering strip and the recesses arranged on both sides is particularly advantageously continuously shaped, so that the cylindrical end runs in tangential extension into a rounded recess or groove, which in turn continuously merges into the adjoining part of the metering strip, where the stripped ink flows off to be collected in a pool or the like.

Erfindungsgemäß kann die Dosierleiste einstückig ausgebildet sein, sie kann andererseits jedoch auch mehrteilig aus zumindest dem zylindrischen Ende, einem in einer schwenkbaren Halterung angeordneten Teil, der vom zylindrischen Ende in die Halterung ragt, und einem weiteren, die Ausnehmung aufnehmenden Teil bestehen, die in geeigneter Weise starr miteinander verbunden sind. Die einstückige Dosierleiste stellt jedoch eine besonders bevorzugte Ausführungsform dar, weil in diesem Fall die höchsten Maßgenauigkeiten, insbesondere über die gesamte Länge der Dosierleiste, erreichbar sind. Paßprobleme infolge der Verbindung mehrerer Teile, beispielsweise beim Kleben oder Schweißen, können nämlich vermieden werden. Ganz besonders bei einer mehrseitenbreiten Dosierleiste, wie sie beispielsweise beim sogenannten Panoramadruck benutzt wird, kommt dieser Vorteil der Einstückigkeit zum Tragen.According to the invention, the metering strip can be formed in one piece, but on the other hand it can also consist of several parts, at least the cylindrical end, a part arranged in a pivotable holder, which protrudes from the cylindrical end into the holder, and a further part that receives the recess, which are suitably rigidly connected to one another. However, the one-piece metering bar represents a particularly preferred embodiment, because in this case the highest dimensional accuracies, in particular over the entire length of the metering bar, can be achieved. Fitting problems due to the connection of several parts, for example when gluing or welding, can be avoided. This advantage of one-piece construction comes into play particularly in the case of a multi-page wide metering strip, such as is used for so-called panorama printing.

Die erfindungsgemäße Form der Dosierleiste im Bereich der Berührungsstelle mit der Farbauftragswalze und dem in die schwenkbare Halterung, mit auf beiden Seiten versehenen Ausnehmungen ragenden Teil, kann durch Formschleifen oder -fräsen, Funkenerosion oder andere geeignete Bearbeitungsmethoden hergestellt werden.The shape of the metering strip according to the invention in the region of the contact point with the inking roller and the part projecting into the pivotable holder with recesses on both sides can be produced by shape grinding or milling, spark erosion or other suitable machining methods.

Zur Erzielung der gewünschten Verschleißfestigkeit kann die Dosierleiste aus geeignetem vollen Material bestehen, bevorzugterweise ist jedoch nur das zylindrisch geformte Ende durch Verwendung eines geeigneten Materials, wie beispielsweise Keramik, Sintermetall oder einem verschleißfesten Kunststoff verschleißfest ausgebildet. Es genügt auch, lediglich dessen Oberfläche verschleißfest auszubilden, was vorteilhafterweise durch Aufbringen einer geeigneten Schicht, wie beispielsweise Karbide, Nitride, Oxide etc. geschehen kann.To achieve the desired wear resistance, the metering strip can be made of a suitable solid material, but preferably only the cylindrically shaped end is designed to be wear-resistant by using a suitable material, such as, for example, ceramic, sintered metal or a wear-resistant plastic. It is also sufficient to merely make its surface wear-resistant, which can advantageously be done by applying a suitable layer, such as carbides, nitrides, oxides, etc.

Die Erfindung wird nachstehend anhand einer bevorzugten Ausführungsform unter Bezugnahme auf die Zeichnungen im einzelnen erläutert. Dabei werden weitere Vorteile und Merkmale der vorliegenden Erfindung offenbart. Es zeigen:

Fig. 1
eine Dosierleiste mit einem zylindrisch geformten Ende, das einen Winkelbereich von mehr als 180° überdeckt und an das sich beidseitig an der Dosierleiste ausgebildete Ausnehmungen anschließen;
Fig. 2
eine schematische Darstellung der geschwenkten Dosierleiste gemäß Fig. 1; und
Fig. 3
ein schematisch dargestelltes Druckwerk einer bekannten Offset-Rotationsdruckmaschine mit Farb- und Feuchtwerk sowie einer bekannten Dosiervorrichtung.
The invention is explained below with reference to a preferred embodiment with reference to the drawings. Further advantages and features of the present invention are disclosed. Show it:
Fig. 1
a metering bar with a cylindrically shaped end, which covers an angular range of more than 180 ° and to which recesses formed on both sides of the metering bar are connected;
Fig. 2
a schematic representation of the pivoted metering bar according to FIG. 1; and
Fig. 3
a schematically illustrated printing unit of a known offset rotary printing press with inking and dampening units and a known metering device.

Das in Fig. 3 schematisch dargestellte Druckwerk einer bekannten Offset-Rotationsmaschine weist einen Gummituchzylinder 1 auf, an den ein Gegendruckzylinder 2 angestellt ist, der aber auch als weiterer Gummituchzylinder ausgebildet sein kann. Eine zu bedruckende Papierbahn 3 wird zwischen Gummituchzylinder 1 und Gegendruckzylinder 2 hindurchgeführt und bedruckt. Eine Farbauftragswalze 6 mit einer elastischen Oberfläche steht in Kontakt mit einem Plattenzylinder 4, der zur Übertragung der Farbe von der Farbauftragswalze 6 auf den Gummituchzylinder 1 dient. Auf der Farbauftragswalze 6 wird mit einer Farbauftragsvorrichtung 7 ein über die ganze Breite der Farbauftragswalze 6 konstantes Maß aufweisender, vordosierter Farbfilm 8 geschaffen, dessen Stärke um ein Vielfaches größer ist als diejenige des auf den Plattenzylinder 4 übertragbaren Farbfilms 9. Die Farbauftragsvorrichtung 7 weist in der vorliegenden Ausführungsform einen Farbkasten 10 auf, der mit einem die Dosierung bestimmenden, in bekannter Weise einstellbaren Farbmesser 11 versehen ist. Ein Teil des vordosierten Farbfilms 8, der von der Farbauftragswalze 6 aufgenommen wird, wird anschließend mit einer der Farbauftragsvorrichtung 7 nachgeordneten Dosierleiste 12 abgestreift, die in ihrer Normallage etwa senkrecht, d. h., etwa in radialer Richtung, zur Farbauftragswalze 6 steht. Es entsteht somit der auf den Plattenzylinder übertragbare Farbfilm 9. Die von der Dosierleiste 12 abgestreifte, überschüssige Farbe 13 läuft entlang der Dosierleiste 12, ansonsten jedoch frei, in einen Sammelbehälter 14 und wird von dort wieder in die Farbauftragsvorrichtung 7 zurückgepumpt.The printing unit, shown schematically in FIG. 3, of a known offset rotary machine has a blanket cylinder 1, against which an impression cylinder 2 is attached, but which can also be designed as a further blanket cylinder. A paper web 3 to be printed is passed between blanket cylinder 1 and impression cylinder 2 and printed. An inking roller 6 with an elastic surface is in contact with a plate cylinder 4, which is used to transfer the ink from the inking roller 6 to the blanket cylinder 1. On the ink application roller 6, a pre-dosed ink film 8, which has a constant dimension over the entire width of the ink application roller 6 and whose thickness is many times greater than that of the ink film 9 that can be transferred to the plate cylinder 4, is created with an ink application device 7 In the present embodiment, an ink fountain 10 is provided, which is provided with an ink knife 11 which determines the dosage and is adjustable in a known manner. A portion of the pre-dosed ink film 8, which is taken up by the inking roller 6, is then stripped off with a metering bar 12 arranged downstream of the inking device 7, which in its normal position is approximately vertical, ie. that is, approximately in the radial direction, to the inking roller 6. This results in the ink film 9 which can be transferred to the plate cylinder. The excess ink 13 stripped off from the metering bar 12 runs along the metering bar 12, but is otherwise free, into a collecting container 14 and is pumped back from there into the ink application device 7.

Der auf den Plattenzylinder 4 übertragbare Farbfilm 9 weist über die ganze Breite der Farbauftragswalze 6 eine konstante Dicke auf. Diese Dicke kann durch mehr oder weniger starkes Anstellen der Dosierleiste an die Farbauftragswalze 6 eingestellt werden, was mit nicht dargestellten, bekannten Verstellmechanismen erfolgen kann.The ink film 9 which can be transferred to the plate cylinder 4 has a constant thickness over the entire width of the inking roller 6 on. This thickness can be adjusted by placing the metering bar on the inking roller 6 to a greater or lesser extent, which can be done with known adjustment mechanisms, not shown.

Fig. 2 zeigt einen Ausschnitt der Farbauftragswalze 6, welcher mit der Dosierleiste 12 in Kontakt steht. Die Farbauftragswalze 6 ist mit einem elastischem Überzug 16 versehen und rotiert in Richtung des Pfeils D. Die Dosierleiste 12 weist an dem der Farbauftragswalze 6 zugewandten Ende 13 eine zylinderförmige Oberfläche auf. Die Achse 17 dieser zylinderförmigen Oberfläche ist auch die Drehachse, um welche die Dosierleiste 12 um den Winkel α schwenkbar ist.Fig. 2 shows a section of the inking roller 6, which is in contact with the metering bar 12. The inking roller 6 is provided with an elastic coating 16 and rotates in the direction of arrow D. The metering bar 12 has a cylindrical surface at the end 13 facing the inking roller 6. The axis 17 of this cylindrical surface is also the axis of rotation about which the metering bar 12 can be pivoted by the angle α.

Fig. 1 schließlich zeigt die Dosierleiste 12 mit einem über einen Winkelbereich W zylindrisch geformten und einen Radius R aufweisenden Ende 13, an das sich beidseitig an der Dosierleiste 12 ausgebildete, axial verlaufende Ausnehmungen 14 anschließen. Die Ausnehmungen 14 weisen im wesentlichen V-Form auf, so daß der zylindrisch geformte Teil 13 etwa in tangentialer Verlängerung beidseitig in die Ausnehmungen 14 übergeht. Die durch die beidseitigen Ausnehmungen 14 definierte engste Stelle der Dosierleiste 12 ist zur Förderung des Abflusses der abgestreiften Druckfarbe gerundet. So stellt diese Dosierleiste 12 für die abgestreifte Druckfarbe eine nahezu kontinuierlich verlaufende Ablauffläche dar.1 finally shows the metering strip 12 with an end 13 which is cylindrically shaped over an angular range W and has a radius R, to which axially extending recesses 14 formed on both sides of the metering strip 12 are connected. The recesses 14 are essentially V-shaped, so that the cylindrically shaped part 13 merges into the recesses 14 on both sides approximately in a tangential extension. The narrowest point of the metering bar 12, which is defined by the recesses 14 on both sides, is rounded to promote the outflow of the stripped printing ink. Thus, this metering bar 12 represents an almost continuously running drain surface for the stripped printing ink.

Der Radius R des zylindrisch geformten Endes 13 der Dosierleiste 12 liegt im Bereich zwischen 0,3 und 1,5 mm. Dabei überdeckt dieses zylindrische Ende einen Winkelbereich W, der größer als 180° ist. Im dargestellten Ausführungsbeispiel beträgt dieser Winkelbereich W in etwa 250°.The radius R of the cylindrically shaped end 13 of the metering bar 12 is in the range between 0.3 and 1.5 mm. This cylindrical end covers an angular range W that is greater than 180 °. In the illustrated embodiment, this angular range W is approximately 250 °.

Wie in Fig. 2 deutlich zu erkennen ist, kann die Dosierleiste 12 infolge ihres ausgeprägt, nämlich über 180° überdeckenden, zylindrischen Endes 13 mit den sich beidseitig der Dosierleiste an dieses zylindrisch geformte Ende 13 anschließenden Ausnehmungen 14 in einem weiten Winkelbereich α verschwenkt werden und ermöglicht dadurch nahezu jede gewünschte Anstellung zur Farbauftragswalze 6. Der zum Verschwenken der Dosierleiste 12 nutzbare Winkelbereich α kann somit nahezu ± 90°, bezogen auf die Normallage, betragen, ohne den freien Abfluß des abgestreiften Farbfilms in unerwünschter Weise zu beeinträchtigen.As can be clearly seen in FIG. 2, the metering strip 12 can, owing to its pronounced, namely 180 ° overlapping, cylindrical end 13 with the recesses adjoining this cylindrically shaped end 13 on both sides of the metering strip 14 can be pivoted in a wide angular range α and thereby enables almost any desired position to the inking roller 6. The angular range α usable for pivoting the metering bar 12 can thus be almost ± 90 °, based on the normal position, without the free discharge of the stripped ink film in undesirably affect.

Claims (8)

  1. A metering strip for an inking unit of a printing machine for metering printing ink, in particular a scraper or a doctor blade, which
    a) is secured in a pivotal mounting and.
    b) has a cylindrically shaped end (13) having a radius (R) in the range between 0.3 and 1.5 mm, this end
    b1) forming, when pressed against an ink application roller (6), a metering gap with this roller (6) for the printing ink to be metered,
    characterized in that
    c) the cylindrically shaped end (13) covers an angular range (W) of more than 180°;
    d) axially running recesses (14) formed on both sides of the metering strip (12) adjoin the cylindrically shaped end (13); and
    e) the cylindrically shaped end (13) is constructed to be wear-resistant.
  2. A metering strip according to Claim 1, characterized in that the angular range (w) is between 200° and 280° and is in particular approximately 250°.
  3. A metering strip according to Claim 1 or 2, characterized in that the transition between the cylindrically shaped end (13) and the recesses (14) is of continuous construction.
  4. A metering strip according to one of Claims 1 to 3, characterized in that the cylindrically shaped end (13) and the part (15) projecting into the pivotal mounting are constructed in one piece.
  5. A metering strip according to one of Claims 1 to 3, characterized in that the metering strip (12) comprises, in a plurality of parts, at least the cylindrical end (13), the part (15) projecting into the pivotal mounting and the part which houses the recess (14), these parts being rigidly connected to one another.
  6. A metering strip according to one of Claims 1 to 5, characterized in that the cylindrically shaped end (13) is formed by a wear-resistant ceramic, sintered metal or plastics material.
  7. A metering strip according to one of Claims 1 to 6, characterized in that the cylindrically shaped end (13) has a wear-resistant surface.
  8. A metering strip according to Claim 7, characterized in that the wear-resistant surface is formed by a vapour-deposited metal layer.
EP92811018A 1992-01-14 1992-12-22 Metering strip Expired - Lifetime EP0551797B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4200769A DE4200769C1 (en) 1992-01-14 1992-01-14
DE4200769 1992-01-14

Publications (2)

Publication Number Publication Date
EP0551797A1 EP0551797A1 (en) 1993-07-21
EP0551797B1 true EP0551797B1 (en) 1996-06-05

Family

ID=6449492

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92811018A Expired - Lifetime EP0551797B1 (en) 1992-01-14 1992-12-22 Metering strip

Country Status (6)

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EP (1) EP0551797B1 (en)
JP (1) JPH0796297B2 (en)
AT (1) ATE138853T1 (en)
DE (2) DE4200769C1 (en)
DK (1) DK0551797T3 (en)
FI (1) FI104545B (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2707918B1 (en) * 1993-07-19 1995-10-06 Chevreux Pierre Plastic scraper for wiping cylinders of printing machines.
DE29617230U1 (en) * 1996-10-04 1996-12-05 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Application device for applying a coating medium
DE29704025U1 (en) * 1997-03-06 1997-05-07 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Blade for an applicator or squeegee device
DE29716647U1 (en) * 1997-09-17 1997-10-30 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Pressure bar
WO2004037539A2 (en) 2002-10-19 2004-05-06 Koenig & Bauer Aktiengesellschaft Doctor blade devices for a strip-producing or strip-processing machine
WO2004084292A1 (en) * 2003-03-20 2004-09-30 Matsushita Electric Industrial Co., Ltd. Finfet-type semiconductor device and method for fabricating the same

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2110299C3 (en) * 1971-03-04 1973-10-04 Maschinenfabrik Augsburg-Nuernberg Ag, 8900 Augsburg Inking knives for inking units of printing machines
EP0070484A1 (en) * 1981-07-13 1983-01-26 Dahlgren Manufacturing Company Ink metering apparatus with obtuse metering member
SE437683B (en) * 1982-10-13 1985-03-11 Inventing Ab CREATE OR SHELL - MATERIAL AGAINST THE ROLL - BY EXV
JPS5973952A (en) * 1982-10-21 1984-04-26 Toppan Printing Co Ltd Ink supply method, inking apparatus and roll
JPH0675963B2 (en) * 1986-12-09 1994-09-28 株式会社東京機械製作所 Ink supply device
DE3714936A1 (en) * 1987-05-05 1988-12-08 Wifag Maschf INK FOR A PRINTING MACHINE
DE8713788U1 (en) * 1987-10-10 1989-02-02 Zimmer, Johannes, Klagenfurt, Kärnten Squeegee device
US5099783A (en) * 1990-04-17 1992-03-31 Graco Inc. Doctor blade cap

Also Published As

Publication number Publication date
JPH0623963A (en) 1994-02-01
EP0551797A1 (en) 1993-07-21
DK0551797T3 (en) 1996-10-21
FI930128A0 (en) 1993-01-13
DE59206495D1 (en) 1996-07-11
DE4200769C1 (en) 1993-07-22
FI930128L (en) 1993-07-15
FI104545B (en) 2000-02-29
JPH0796297B2 (en) 1995-10-18
ATE138853T1 (en) 1996-06-15

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