EP0455997B1 - Inking unit - Google Patents

Inking unit Download PDF

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Publication number
EP0455997B1
EP0455997B1 EP91105610A EP91105610A EP0455997B1 EP 0455997 B1 EP0455997 B1 EP 0455997B1 EP 91105610 A EP91105610 A EP 91105610A EP 91105610 A EP91105610 A EP 91105610A EP 0455997 B1 EP0455997 B1 EP 0455997B1
Authority
EP
European Patent Office
Prior art keywords
printing cylinder
inking
roller
ink
inking unit
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
EP91105610A
Other languages
German (de)
French (fr)
Other versions
EP0455997A1 (en
Inventor
Volker Dipl.-Ing. Schröder
Klaus Gerhard
Jörg Schäperklaus
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
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 Windmoeller and Hoelscher KG filed Critical Windmoeller and Hoelscher KG
Publication of EP0455997A1 publication Critical patent/EP0455997A1/en
Application granted granted Critical
Publication of EP0455997B1 publication Critical patent/EP0455997B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/061—Inking devices
    • B41F9/063—Using inking rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/025—Ducts formed between two rollers

Definitions

  • the invention relates to an inking unit with a printing cylinder and an applicator roller according to the preamble of claim 1.
  • Inking units are already known in which the ink is applied by means of a slowly rotating application roller, which rotates within a paint application hood in a distribution channel.
  • the jacket of the application roller and the printing cylinder form a wedge groove which ends in a narrow gap, the size of which can be adjusted depending on the desired ink film thickness.
  • the jacket of the application roller is designed as a felt cloth, which absorbs some of the paint and has a rough surface.
  • the ink running off from the printing cylinder is collected in a trough located below the printing cylinder, the so-called ink fountain, and fed to a collecting tank. Excess ink is wiped off using an adjustable squeegee before printing on the web.
  • a generic inking unit is known from JP-A-59127764.
  • the application roller also has a smooth outer surface and the application roller can be adjusted without a gap to the printing cylinder during the ink application.
  • the object of the invention is to develop a generic inking unit in such a way that the wear which occurs as a result of the doctor blade possibly running dry is largely prevented.
  • a shell-like sheet is arranged underneath the pressure roller and can be delivered to it.
  • the bowl-like sheet can be placed tangentially on the printing cylinder in such a way that the removed ink cannot be thrown off. This will make the squeegee dry and thereby conditional wear prevented.
  • the shell-like sheet metal can on the one hand be articulated to a fixed pivot point and can be pivoted about this by means of a handle. This enables simple handling by the operating personnel.
  • the ink application result can be optimized by varying the contact pressure of the application roller or by varying its peripheral speed.
  • the peripheral speed of the application roller during the ink application is lower than that of the printing cylinder.
  • the contact pressure between the application roller and the pressure cylinder can be variably adjustable.
  • the axis of rotation of the applicator roller is arranged above that of the printing cylinder.
  • the circulation path of the printing roller is kept as small as possible after the web has been printed until the ink is applied again.
  • FIG. 1 shows a schematic sectional view through an embodiment of the inking unit according to the invention.
  • the inking unit 10 has a printing cylinder 14 in a known manner, to which a web 28 to be printed is pressed by means of a counter-pressure roller 26.
  • the direction of rotation of the printing cylinder is indicated by arrow a.
  • An application roller 12 is attached to the printing cylinder. This has a coated, smooth outer surface 16, preferably made of rubber or plastic, and can be set against the printing cylinder 14 with variable pressure.
  • the direction of rotation of the application roller 12 is indicated by the arrow b.
  • the axis of rotation 18 of the application roller 12 is arranged above the axis of rotation of the printing cylinder 14 when viewed from the bottom.
  • the applicator roller 12 is slidably mounted in the machine frame in a manner not shown, so that it can be adjusted to printing cylinders of different diameters.
  • the ink feed 30 is arranged above the application roller 12 in a manner known per se.
  • the ink runs into the wedge groove formed between the application roller 12 and the printing cylinder 14 and is essentially pressed into the suction cups on the surface of the printing cylinder 14 by means of the application roller 12.
  • the ink application can be varied by varying the peripheral speed of the application roller 12 compared to that of the printing cylinder and by varying the contact pressure of the application roller on the printing cylinder. Good results are generally achieved if the peripheral speed of the application roller is lower than that of the printing cylinder 14.
  • a trough-shaped ink fountain 32 with an outlet 34 is arranged in the usual manner below the printing cylinder.
  • the applicator roller 12 is essentially opposite on the other side of the ink fountain a doctor blade 36 in a conventional design to the printing cylinder 14, which serves to excess ink on the Squeegee cylinder off.
  • a shell-like sheet 20 that can be pivoted about a pivot point 22 is arranged.
  • This shell-like sheet 20 underpins the pressure cylinder 14, wherein it is connected via a lever mechanism 35 which engages near its free end to a handle 24 in such a way that when the handle 24 is deflected in the double arrow direction c it carries out a corresponding pivoting movement in the double arrow direction d.
  • the shell-like sheet 20 can be fixed by a conventional locking mechanism, for example a locking screw (not shown in the figure).
  • the shell-like sheet 20 which in its area near the pivot point 22 is preferably designed as a flat plate, as shown in the figure, can be used in a particularly advantageous manner to prevent any wear caused by the doctor blade 36 running dry.

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

Description

Die Erfindung betrifft ein Farbwerk mit einem Druckzylinder und einer Auftragswalze nach dem Oberbegriff des Anspruchs 1.The invention relates to an inking unit with a printing cylinder and an applicator roller according to the preamble of claim 1.

Es sind bereits Farbwerke bekannt, bei denen die Farbauftragung mittels einer langsam rotierenden Auftragswalze erfolgt, die sich innerhalb einer Farbauftragshaube in einer Verteilrinne dreht. Durch entsprechende Anordnung der Auftragungswalze an den Druckzylinder bilden der Mantel der Auftragswalze und der Druckzylinder eine Keilrinne, die in einem schmalen Spalt endet, dessen Größe je nach der gewünschten Farbfilmstärke einstellbar ist. Dabei ist es bekannt, den Mantel der Auftragswalze als Filztuch auszuführen, welches einen Teil der Farbe aufsaugt und eine rauhe Oberfläche hat. Die vom Druckzylinder ablaufende Farbe wird in einer unterhalb des Druckzylinders angeordneten Wanne, dem sogenannten Farbkasten, aufgefangen und einem Sammeltank zugeführt. Überschüssige Farbe wird vor dem Bedrucken der Bahn mittels einer zustellbaren Rakel abgestreift. Dieser vorbekannte Stand der Technik weist den Nachteil auf, daß die Farbe durch die Auftragswalze nicht gleichmäßig auf die Druckwalze aufgetragen werden kann. Die Farbschicht soll sich zwar je nach eingestellter Spaltbreite gleichmäßig über die Druckwalze verteilen, in der Realität wird aber beobachtet, daß kein gleichmäßiger Farbauftrag auf der Druckwalze erreicht werden kann, worunter auch die erzielte Druckqualität leidet.Inking units are already known in which the ink is applied by means of a slowly rotating application roller, which rotates within a paint application hood in a distribution channel. By arranging the application roller appropriately on the printing cylinder, the jacket of the application roller and the printing cylinder form a wedge groove which ends in a narrow gap, the size of which can be adjusted depending on the desired ink film thickness. It is known to design the jacket of the application roller as a felt cloth, which absorbs some of the paint and has a rough surface. The ink running off from the printing cylinder is collected in a trough located below the printing cylinder, the so-called ink fountain, and fed to a collecting tank. Excess ink is wiped off using an adjustable squeegee before printing on the web. This known prior art has the disadvantage that the ink cannot be applied uniformly to the printing roller by the application roller. Depending on the gap width set, the ink layer is to be distributed evenly over the printing roller, but in reality it is observed that no uniform ink application can be achieved on the printing roller, including the print quality achieved also suffers.

Ein gattungsgemäßes Farbwerk ist aus der JP-A-59127764 bekannt. Dort weist die Auftragswalze ebenfalls eine glatte Mantelfläche auf und die Auftragswalze ist während des Farbauftrags ohne Spalt an den Druckzylinder einstellbar.A generic inking unit is known from JP-A-59127764. There, the application roller also has a smooth outer surface and the application roller can be adjusted without a gap to the printing cylinder during the ink application.

Aus der US-A-3,283,712 ist es aus einem sich im Aufbau von gattungsgemäßem Farbwerk unterscheidenden Farbwerk bereits bekannt, daß die Umfangsgeschwindigkeit der Auftragswalze gegenüber derjenigen des Druckzylinders variiert wird und daß der Anpreßdruck der Auftragswalze an dem Druckzylinder entsprechend variiert wird.From US-A-3,283,712 it is already known from a different in the structure of generic inking unit that the peripheral speed of the application roller is varied compared to that of the printing cylinder and that the contact pressure of the application roller on the printing cylinder is varied accordingly.

Bei einer Ausführung des Farbwerks gemäß diesem Stand der Technik besteht die Gefahr, daß sowenig Farbe auf den Druckzylinder aufgetragen wird, daß die Rakel trockenläuft. Das ist insbesondere dann zu befürchten, wenn eine vergleichsweise dünne Farbschicht aufgetragen wird, die aufgrund der verhältnismäßig hohen Umfangsgeschwindigkeit des Druckzylinders in die unterhalb des Druckzylinders angeordnete Auffangwanne abgeschleudert wird. Dieses Trockenlaufen der Rakel führt zu unerwünschtem Verschleiß.When the inking unit is designed in accordance with this prior art, there is a risk that as little ink is applied to the printing cylinder that the doctor blade runs dry. This is particularly to be feared if a comparatively thin layer of ink is applied, which due to the relatively high peripheral speed of the printing cylinder is thrown off into the collecting trough arranged below the printing cylinder. This dry running of the doctor blade leads to undesirable wear.

Aufgabe der Erfindung ist es, ein gattungsgemäßes Farbwerk derart weiterzubilden, daß dem durch ein eventuelles Trockenlaufen der Rakel auftretende Verschleiß weitgehend verhindert wird.The object of the invention is to develop a generic inking unit in such a way that the wear which occurs as a result of the doctor blade possibly running dry is largely prevented.

Diese Aufgabe wird in Weiterbildung des gattungsbildenden Standes der Technik durch die kennzeichnenden Merkmale des Anspruchs 1 gelöst. Demnach ist unterhalb der Druckwalze ein schalenartiges Blech zustellbar zu dieser angeordnet. Das schalenartige Blech kann derart tangential an den Druckzylinder angestellt werden, daß ein Abschleudern der abgetragenen Farbe verhindert werden kann. Damit wird ein Trockenlaufen der Rakel und der dadurch bedingte Verschleiß unterbunden. Das schalenartige Blech kann einerseits an einem anlagenfesten Schwenkpunkt angelenkt sein und mittels eines Handgriffs um diesen verschwenkbar sein. Dadurch ist eine einfache Handhabung durch das Bedienungspersonal möglich.This object is achieved in a further development of the generic state of the art by the characterizing features of claim 1. Accordingly, a shell-like sheet is arranged underneath the pressure roller and can be delivered to it. The bowl-like sheet can be placed tangentially on the printing cylinder in such a way that the removed ink cannot be thrown off. This will make the squeegee dry and thereby conditional wear prevented. The shell-like sheet metal can on the one hand be articulated to a fixed pivot point and can be pivoted about this by means of a handle. This enables simple handling by the operating personnel.

Bei einer bevorzugten Ausführungsform kann je nach Stoffeigenschaften der aufzutragenden Farbe das Farbauftragsergebnis durch Variation des Anstelldrucks der Auftragswalze bzw. durch Variation von deren Umfangsgeschwindigkeit optimiert werden. Zur Erzielung eines gleichmäßigen Farbauftrags hat es sich als besonders vorteilhaft ergeben, daß die Umfangsgeschwindigkeit der Auftragswalze während des Farbauftrags geringer ist als diejenige des Druckzylinders. Der Anpreßdruck zwischen der Auftragswalze und dem Druckzylinder kann variabel einstellbar sein.In a preferred embodiment, depending on the material properties of the paint to be applied, the ink application result can be optimized by varying the contact pressure of the application roller or by varying its peripheral speed. In order to achieve a uniform ink application, it has been found to be particularly advantageous that the peripheral speed of the application roller during the ink application is lower than that of the printing cylinder. The contact pressure between the application roller and the pressure cylinder can be variably adjustable.

Gemäß einer bevorzugten Ausführungsform der Erfindung ist die Drehachse der Auftragswalze oberhalb derjenigen des Druckzylinders angeordnet. Dadurch wird der Umlaufweg der Druckwalze nach Bedrucken der Bahn bis zum Neuauftrag der Farbe möglichst klein gehalten.According to a preferred embodiment of the invention, the axis of rotation of the applicator roller is arranged above that of the printing cylinder. As a result, the circulation path of the printing roller is kept as small as possible after the web has been printed until the ink is applied again.

Dadurch kann in vorteilhafter Weise ein Antrocknen der Farbreste innerhalb der Saugnäpfchen des Druckzylinders verhindert werden, da aufgrund der relativ hohen Umfangsgeschwindigkeit der durch diese Lehre verkürzte Weg, den die Saugnäpfchen nach Abgabe der Farbe an das zu bedruckende Medium zurückzulegen haben, schnell zurückgelegt wird und ein Austrocknen auch bei hochflüchtiger Farbe nicht zu befürchten ist.This can advantageously prevent drying of the ink residues within the suction cups of the printing cylinder, since due to the relatively high peripheral speed, the distance shortened by this teaching, which the suction cups have to cover after the ink has been given to the medium to be printed, is quickly covered and on Drying out is not to be feared even with highly volatile paint.

Weitere Einzelheiten und Vorteile der Erfindung sind anhand eines in der Zeichnung dargestellten Ausführungsbeispiels erläutert. Die Figur zeigt eine schematische Schnittdarstellung durch eine Ausführungsform des erfindungsgemäßen Farbwerks.Further details and advantages of the invention are explained with reference to an embodiment shown in the drawing. The figure shows a schematic sectional view through an embodiment of the inking unit according to the invention.

Das Farbwerk 10 weist einen Druckzylinder 14 in bekannter Weise auf, an den mittels einer Gegendruckwalze 26 eine zu bedruckende Bahn 28 angedrückt wird. In der Figur ist die Drehrichtung des Druckzylinders mit dem Pfeil a angezeigt. An den Druckzylinder angestellt ist eine Auftragswalze 12. Diese weist eine beschichtete, glatte Mantelfläche 16, vorzugsweise aus Gummi oder Kunststoff, auf und ist mit variablem Druck gegen den Druckzylinder 14 anstellbar. Die Laufrichtung der Auftragswalze 12 ist mit dem Pfeil b angezeigt. Die Drehachse 18 der Auftragswalze 12 ist vom Boden aus gesehen oberhalb der Drehachse des Druckzylinders 14 angeordnet. Selbstverständlich ist die Auftragswalze 12 in nicht näher dargestellter Weise verschieblich im Maschinengestell gelagert, so daß sie jeweils an Druckzylinder unterschiedlicher Durchmesser angestellt werden kann.The inking unit 10 has a printing cylinder 14 in a known manner, to which a web 28 to be printed is pressed by means of a counter-pressure roller 26. In the figure, the direction of rotation of the printing cylinder is indicated by arrow a. An application roller 12 is attached to the printing cylinder. This has a coated, smooth outer surface 16, preferably made of rubber or plastic, and can be set against the printing cylinder 14 with variable pressure. The direction of rotation of the application roller 12 is indicated by the arrow b. The axis of rotation 18 of the application roller 12 is arranged above the axis of rotation of the printing cylinder 14 when viewed from the bottom. Of course, the applicator roller 12 is slidably mounted in the machine frame in a manner not shown, so that it can be adjusted to printing cylinders of different diameters.

Oberhalb der Auftragswalze 12 ist der Farbzulauf 30 in an sich bekannter Weise angeordnet. Die Farbe läuft in die zwischen Auftragswalze 12 und Druckzylinder 14 ausgebildete Keilrinne und wird mittels der Auftragswalze 12 im wesentlichen in die Saugnäpfchen auf der Oberfläche des Druckzylinders 14 hineingepreßt. Je nach den Eigenschaften der aufzutragenden Farbe kann der Farbauftrag dadurch variiert werden, daß die Umfangsgeschwindigkeit der Auftragswalze 12 gegenüber derjenigen des Druckzylinders variiert wird und daß der Anpreßdruck der Auftragswalze an dem Druckzylinder entsprechend variiert wird. Gute Ergebnisse werden in der Regel erzielt, wenn die Umfangsgeschwindigkeit der Auftragswalze niedriger ist als diejenige des Druckzylinders 14.The ink feed 30 is arranged above the application roller 12 in a manner known per se. The ink runs into the wedge groove formed between the application roller 12 and the printing cylinder 14 and is essentially pressed into the suction cups on the surface of the printing cylinder 14 by means of the application roller 12. Depending on the properties of the ink to be applied, the ink application can be varied by varying the peripheral speed of the application roller 12 compared to that of the printing cylinder and by varying the contact pressure of the application roller on the printing cylinder. Good results are generally achieved if the peripheral speed of the application roller is lower than that of the printing cylinder 14.

Unterhalb des Druckzylinders ist in üblicher Weise ein trogförmiger Farbkasten 32 mit Ablauf 34 angeordnet. Der Auftragswalze 12 im wesentlichen gegenüberliegend ist auf der anderen Seite des Farbkastens eine Rakel 36 in üblicher Bauweise an den Druckzylinder 14 angestellt, die dazu dient, überschüssige Farbe auf dem Druckzylinder wegzurakeln.A trough-shaped ink fountain 32 with an outlet 34 is arranged in the usual manner below the printing cylinder. The applicator roller 12 is essentially opposite on the other side of the ink fountain a doctor blade 36 in a conventional design to the printing cylinder 14, which serves to excess ink on the Squeegee cylinder off.

Zwischen dem Druckzylinder 14 und dem trogförmigen Farbkasten 32 ist ein um einen Schwenkpunkt 22 verschwenkbares schalenartiges Blech 20 angeordnet. Dieses schalenartige Blech 20 unterfängt den Druckzylinder 14, wobei es über einem nahe seinem freien Ende angreifenden Hebelmechanismus 35 mit einem Handgriff 24 derart verbunden ist, daß es bei einer Auslenkung des Handgriffs 24 in Doppelpfeilrichtung c eine entsprechende Schwenkbewegung in Doppelpfeilrichtung d ausführt. In einer gewünschten Lage kann das schalenartige Blech 20 durch einen üblichen Feststellmechanismus, beispielsweise eine Feststellschraube, fixiert werden (in der Figur nicht dargestellt). Mittels des anstellbaren schalenartigen Blechs kann nun verhindert werden, daß die auf der Druckwalze außerhalb der Saugnäpfchen befindliche Farbe vollständig in den Farbkasten 32 abgeschleudert wird und daß dadurch die Rakel 36 trockenläuft. Somit kann durch das schalenartige Blech 20, das in seinem Bereich nahe des Schwenkpunkts 22 vorzugsweise als ebene Platte, wie in der Figur dargestellt ist, ausgeführt ist, in besonders vorteilhafter Weise jeglicher Verschleiß durch Trockenlaufen der Rakel 36 verhindert werden.Between the printing cylinder 14 and the trough-shaped ink fountain 32, a shell-like sheet 20 that can be pivoted about a pivot point 22 is arranged. This shell-like sheet 20 underpins the pressure cylinder 14, wherein it is connected via a lever mechanism 35 which engages near its free end to a handle 24 in such a way that when the handle 24 is deflected in the double arrow direction c it carries out a corresponding pivoting movement in the double arrow direction d. In a desired position, the shell-like sheet 20 can be fixed by a conventional locking mechanism, for example a locking screw (not shown in the figure). By means of the adjustable cup-like sheet metal, it can now be prevented that the ink located on the printing roller outside of the suction cups is completely thrown off into the ink fountain 32 and thereby the doctor blade 36 runs dry. Thus, the shell-like sheet 20, which in its area near the pivot point 22 is preferably designed as a flat plate, as shown in the figure, can be used in a particularly advantageous manner to prevent any wear caused by the doctor blade 36 running dry.

Claims (5)

  1. An inking unit with a printing cylinder (14) and an inking roller (12), wherein the inking roller (12) has a smooth cylindrical surface (16) and wherein the inking roller (12) can during the inking be applied to the printing cylinder (14) without any gap and under pressure,
    characterized in that
    the circumferential speed of the inking roller (12) is variable relative to that of the printing cylinder (14) and
    that below the printing cylinder (14), a dish-shaped plate (20) is arranged with the facility of being applied to the latter.
  2. An inking unit according to claim 1, characterized in that the dish-shaped plate (20) is articulated on one side on a pivot pin (22) fixed to the installation and is pivotable round the latter by means of a handle (24).
  3. An inking unit according to claim 2, characterized in that the circumferential speed of the inking roller (12) is lower during the inking than that of the printing cylinder (14).
  4. An inking unit according to one of claims 1 to 3, characterized in that the contact pressure between the inking roller (12) and the printing cylinder (14) is variable.
  5. An inking unit according to one of claims 1 to 4, characterized in that the rotation pin (18) of the inking roller (12) lies above that of the printing cylinder (14).
EP91105610A 1990-05-10 1991-04-09 Inking unit Expired - Lifetime EP0455997B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9005340U DE9005340U1 (en) 1990-05-10 1990-05-10
DE9005340U 1990-05-10

Publications (2)

Publication Number Publication Date
EP0455997A1 EP0455997A1 (en) 1991-11-13
EP0455997B1 true EP0455997B1 (en) 1995-07-19

Family

ID=6853692

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91105610A Expired - Lifetime EP0455997B1 (en) 1990-05-10 1991-04-09 Inking unit

Country Status (3)

Country Link
EP (1) EP0455997B1 (en)
CA (1) CA2041197A1 (en)
DE (2) DE9005340U1 (en)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1678497A (en) * 1922-10-28 1928-07-24 Cooper Jehangir Maneckji Printing process and apparatus therefor
FR1214688A (en) * 1958-03-04 1960-04-11 Dornbusch & Co Color inking device for color imprint calenders
FR1341700A (en) * 1962-09-21 1963-11-02 Etudes De Machines Speciales Method and inking device for oily ink printing machines

Also Published As

Publication number Publication date
EP0455997A1 (en) 1991-11-13
DE9005340U1 (en) 1991-06-06
DE59106005D1 (en) 1995-08-24
CA2041197A1 (en) 1991-11-11

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