EP1354703B1 - Sheet guiding device - Google Patents

Sheet guiding device Download PDF

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Publication number
EP1354703B1
EP1354703B1 EP20030006277 EP03006277A EP1354703B1 EP 1354703 B1 EP1354703 B1 EP 1354703B1 EP 20030006277 EP20030006277 EP 20030006277 EP 03006277 A EP03006277 A EP 03006277A EP 1354703 B1 EP1354703 B1 EP 1354703B1
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EP
European Patent Office
Prior art keywords
sheet guide
sheet
guide device
container
openings
Prior art date
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EP20030006277
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German (de)
French (fr)
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EP1354703A2 (en
EP1354703A3 (en
Inventor
Arndt Jentzsch
Michael Koch
Holger Richter
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Koenig and Bauer AG
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Koenig and Bauer AG
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Publication of EP1354703A3 publication Critical patent/EP1354703A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F22/00—Means preventing smudging of machine parts or printed articles

Definitions

  • the invention relates to a printing machine with a sheet guiding device in sheet delivery and / or under sheet guiding cylinders of printing presses.
  • the sheet transport takes place in the sheet delivery with the aid of grippers, which grasp the sheet at its leading edge and feed it to the individual functional groups.
  • grippers which grasp the sheet at its leading edge and feed it to the individual functional groups.
  • the reason for the deflection of the sheet from its prescribed path can be gravity, centrifugal forces, inertial forces and the wide range of fluid mechanical influences, such as pressure differences and turbulence.
  • the sheet especially if it has been printed in perfecting, smear on machine parts below the Bogen intensiveweges. The same applies to the sheet guiding elements between the printing units.
  • the document DE 197 16 424 A1 discloses a device for avoiding the deposition of ink on cylinders of printing presses.
  • the bow lies with a printed area on the cylinder.
  • a closed color-repellent silicone rubber layer To avoid depositing the outer surface of the cylinder is provided with a closed color-repellent silicone rubber layer.
  • the cylinder is cooled.
  • the deposition of color and the color structure should be avoided by applying a layer of moisture on the cylinder jacket.
  • the moisture layer acts as a release layer.
  • the jacket of the printing cylinder is cooled below the dew point of the air surrounding the printing cylinder.
  • the cooled cylinder jacket is supplied with water vapor-enriched air from the outside, so that the amount of moisture contained in the air can be reflected as a wet film on the pressure cylinder jacket.
  • the application of the water layer proves to be energy-intensive due to the required cooling.
  • the design sheet guiding device consisting of a container for receiving a liquid release agent having on the side facing the sheet a Bogenleit Structure, are provided in the openings through which release agent from the interior of the container on the sheet guide can be conveyed, can in energy-saving manner a release agent film are generated.
  • the release agent used is water.
  • the water may be admixed with additives, for example in the form of surfactants, which lower the surface tension of the water.
  • the release film also acts as a kind of friction coefficient between the sheet guide and the printed sheet side decreasing lubricant, whereby the mechanical stress of the printed sheet is reduced.
  • the promotion of the release agent from the interior of the container to the sheet guide surface can take place under the effect of capillary effects, the suction of arranged in the openings of the sheet guide wicks or under the effect of a producible in the container overpressure.
  • the distribution of the release agent delivered to the sheet guide depends on the interactions between the release agent molecules and the molecules of the surface of the sheet guide surface.
  • the sheet guide surface is therefore provided with a hydrophilic surface. This ensures that forms a release layer of constant thickness.
  • the design of the hydrophilic surface in the form of a layer of modified inorganic nanocrystalline particles, the hydrophilicity of the surface can be increased so that even from small amounts of release agent a closed, the entire sheet guide surface coating release film of minimum thickness arises.
  • aqueous release agent film between the sheet guide and the color-printed side of the sheet is sufficient to avoid the problems of Farbabschmierens on sheet guiding devices in the sheet delivery and in the printing unit in both sides printed sheets as far as possible.
  • the hydrophilicity of the sheet guide surface acts as a transport mechanism for condensed water along the sheet guide surface. This effect proves to be particularly advantageous when the release agent film is partially disturbed by contact with a sequence of sheets. As a result of the strong hydrophilicity of the sheet guide surface, the release agent layer is completely regenerated until the arrival of the respective subsequent sheet.
  • the invention will be described with reference to a sheet guiding device in a sheet delivery 1. However, it can also be used under sheet-guiding cylinders in the printing unit, when a printed side of the sheet 6 to the sheet guiding device shows.
  • Fig. 1 shows a schematic representation of a side view of a sheet delivery 1 with delivery extension. Shown are the front and rear Kettenumlenkrad 2, 3, over which the closed gripper chain 4 is guided with the grippers 5. The gripper 5 are used to promote the printing material, such as sheet 6 to the delivery stack 7. Also shown are the suction roller 8 and the front sheet stops 9. In sheet delivery 1 4 dryer 10 are arranged above the conveying path of the gripper chain. Under the gripper chain 4 below the Bogen intensiveweges the sheet guiding device according to the invention is provided which has the structure described below.
  • the sheet guiding device which extends over the width of the Bogen everydayweges, has on the sheet 6 side facing a smooth sheet guide surface 11.
  • a flat container 13 is provided for receiving the liquid separating agent 10. This is connected via lines 16 to a storage tank 14, from which the container 13 is fed by means of a pump 15 with release agent 10.
  • a device for the preparation of the release agent (not shown in the drawing) may be provided.
  • the sheet guide surface 11 forms the top of the container 13 and is pierced by openings 12 which are arranged regularly. These openings 12 may be formed in a first embodiment with a correspondingly small diameter as capillaries, so that the release agent 10 is promoted under the action of the capillary pressure on the sheet guide surface 11.
  • the openings are made enlarged.
  • a pump 15 is provided through which an overpressure is generated in the container interior 13.
  • a valve 19 may additionally be arranged in the conduit 16.
  • the overpressure can also be adjusted by regulating the delivery rate of the pump 15.
  • 11 plugs 17 are arranged in elastic material in the openings 12 of the sheet guide surface. These have a through opening, in each case an absorbent wick 18 under clamping action of the elastic Material is fixed. At the end of each plug, which faces the bend 6, a shoulder is formed, which can be inserted into corresponding recesses in the sheet guiding surface 11.
  • the sheet guiding surface 11 may have a hydrophilic surface.
  • This consists of additives modified inorganic nanocrystalline particles or other suitable material.
  • the modified inorganic nanosols are composed of two components.
  • the first component includes inorganic oxide nanoparticles of elements of II. - V. Main and subgroup of the Periodic Table or mixtures thereof. These are preferably nanoparticles consisting of SiO 2 , TiO 2 ; Al 2 O 3 or mixtures thereof in aqueous, alcoholic or mixed solvents.
  • the second component consists of the coating material-immiscible additives to achieve the hydrophilic behavior and increase the surface energy of the coating.
  • the above-mentioned additives may be used singly or in combination of two or more.
  • the nanosol layer can be easily produced in the sol-gel process.
  • the function of the sheet guiding device is the following:
  • the sheets 6 are conveyed in the gripper closure by the machine, so that they reach almost without contact to the delivery pile 7.
  • the subject invention is effective upon contact of the sheet 6 with the sheet guide 11th
  • release agent 10 is conveyed from the container 13 to the sheet guide surface 11 and spreads to a release agent film. This forms a color-repellent separating layer, so that a freshly printed surface does not smear in contact with the sheet guide plate 11.

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  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)

Description

Die Erfindung betrifft eine Druckmaschine mit einer Bogenleiteinrichtung in Bogenauslegern und/oder unter Bogenführungszylindern von Druckmaschinen.The invention relates to a printing machine with a sheet guiding device in sheet delivery and / or under sheet guiding cylinders of printing presses.

In Druckmaschinen erfolgt der Bogentransport im Bogenausleger mit Hilfe von Greifern, die den Bogen an seiner Vorderkante erfassen und den einzelnen Funktionsgruppen zuführen. Dabei bewegt sich nur der mittels der Greifer fixierte vordere Teil des Bogens entlang der geradlinigen oder gekrümmten Greiferaufschlagsbahn, während der hintere Bereich erheblich davon abweichen kann. Ursache für die Auslenkung des Bogens von seiner vorgeschriebenen Bahn können Schwerkraft, Fliehkräfte, Trägheitskräfte sowie die breite Palette der strömungsmechanischen Einflüsse, wie Druckdifferenzen und Turbulenzen, sein.
Infolge seiner Abweichung von der vorgeschriebenen Greiferaufschlagbahn kann der Bogen, insbesondere wenn er im Schön- und Widerdruck bedruckt worden ist, an Maschinenteilen unterhalb des Bogenförderweges abschmieren. Gleiches trifft für die Bogenführungselemente zwischen den Druckwerken.In printing presses, the sheet transport takes place in the sheet delivery with the aid of grippers, which grasp the sheet at its leading edge and feed it to the individual functional groups. In this case, only the fixed by means of the gripper front part of the sheet moves along the rectilinear or curved Greiferaufschlagbahn, while the rear area may differ significantly. The reason for the deflection of the sheet from its prescribed path can be gravity, centrifugal forces, inertial forces and the wide range of fluid mechanical influences, such as pressure differences and turbulence.
As a result of its deviation from the prescribed Greiferaufschlagbahn the sheet, especially if it has been printed in perfecting, smear on machine parts below the Bogenförderweges. The same applies to the sheet guiding elements between the printing units.

Es ist aus der DE 43 41 566 A1 bekannt, auf Bogen, die zum Auslegerstapel gefördert werden, eine Trennmittelschicht unter Verwendung fester Trennmittelpartikel aufzutragen. Die Trennmittelschicht in Form von Puder, soll verhindern, dass die im Auslegerstapel aufeinander geschichteten Bogen untereinander abschmieren. Gleiches ist zutreffend für die Bogenführungselemente zwischen den Druckwerken.
Einen Schutz für den bewegten Druckbogen, der die feststehende Leiteinrichtung berührt, gewährleistet die Trennmittelschicht nicht. Berührt der Bogen die Leiteinrichtung, schmiert der Bogen im Druckbild ab.It is known from DE 43 41 566 A1, applied to sheets that are conveyed to the delivery pile, a release agent layer using solid release agent particles. The separating agent layer in the form of powder is intended to prevent the sheets stacked on each other in the delivery stack from smearing one another. The same is true for the sheet guiding elements between the printing units.
Protection for the moving signature touching the stationary guide does not ensure the release agent layer. If the sheet touches the guide, the sheet smears in the printed image.

Die Druckschrift DE 197 16 424 A1 offenbart eine Einrichtung zum Vermeiden des Ablegens von Farbe auf Zylindern von Druckmaschinen. Der Bogen liegt dabei mit einer bedruckten Fläche auf dem Zylinder. Damit besteht die Gefahr, dass die frisch auf den Bogen aufgebrachte Farbe auf der Mantelfläche des Zylinders ablegt und sich Farbe auf dem Zylinder aufbauen kann. Zur Vermeidung des Ablegens ist die Mantelfläche des Zylinders mit einer geschlossenen farbabweisenden Silikon-Gummischicht versehen. Außerdem wird der Zylinder gekühlt.The document DE 197 16 424 A1 discloses a device for avoiding the deposition of ink on cylinders of printing presses. The bow lies with a printed area on the cylinder. Thus there is a risk that the freshly applied to the sheet color deposits on the lateral surface of the cylinder and can build up color on the cylinder. To avoid depositing the outer surface of the cylinder is provided with a closed color-repellent silicone rubber layer. In addition, the cylinder is cooled.

Gemäß der Druckschrift DE-OS 21 27 021 soll das Ablegen von Farbe und der Farbaufbau durch das Auftragen einer Feuchtigkeitsschicht auf den Zylindermantel vermieden werden. Die Feuchtigkeitsschicht wirkt dabei als Trennschicht. Zum Auftragen der Feuchtigkeitsschicht wird der Mantel des Druckzylinders unter dem Taupunkt der den Druckzylinder umgebenden Luft gekühlt. Dem gekühlten Zylindermantel wird von außen mit Wasserdampf angereicherte Luft zugeführt, so dass sich die in der Luft enthaltene Feuchtmenge als Feuchtfilm auf dem Druckzylindermantel niederschlagen kann.
Das Aufbringen der Wasserschicht erweist sich infolge der benötigten Kühlung als energieintensiv.According to the document DE-OS 21 27 021 the deposition of color and the color structure should be avoided by applying a layer of moisture on the cylinder jacket. The moisture layer acts as a release layer. For applying the moisture layer the jacket of the printing cylinder is cooled below the dew point of the air surrounding the printing cylinder. The cooled cylinder jacket is supplied with water vapor-enriched air from the outside, so that the amount of moisture contained in the air can be reflected as a wet film on the pressure cylinder jacket.
The application of the water layer proves to be energy-intensive due to the required cooling.

Bei den in den Druckschriften dargestellten Anordnungen erfolgt keine Relativbewegung zwischen Bogen und Mantelfläche. Die Druckschriften vermitteln keine Lehre, welche Maßnahmen notwendig sind, um bei bewegten Bogen und feststehender Bogenleiteinrichtung im Schön- und Widerdruckbetrieb ein Abschmieren von Farbe an der Bogenleiteinrichtung zu vermeiden.
Aus der DE 10144165 A1 ist eine Bogenführung in Bogenauslegern oder unter Bogenführungszylindem bekannt, die eine dem Bogenleitblech zugeordnete und quer zur Bogenförderrichtung angeordnete Antiabschmiereinrichtung umfasst, die eine zum Bogen weisende erneuerbare Trennmittelschicht aufweist. Nachteilig an der Bogenführung ist, dass das Abschmieren der bedruckten Bogen an den in Bogenförderrichtung der Antiabschmiereinrichtung vorgelagerten Bereichen des Bogenleitblech nicht vermieden wird.In the arrangements shown in the publications, there is no relative movement between the sheet and the lateral surface. The pamphlets do not teach what measures are necessary to avoid smearing of paint on the sheet guiding device in moving bow and fixed sheet guiding device in perfecting operation.
From DE 10144165 A1, a sheet guide in sheet delivery or Bogenführungszylindem is known, which comprises a sheet guide plate associated and arranged transversely to the sheet conveying direction Antiabschmiereinrichtung having a pointing to the sheet Renewable release agent layer. A disadvantage of the sheet guide is that the greasing of the printed sheet is not avoided at the upstream in the sheet conveying direction of Antiabschmiereinrichtung areas of the sheet guide.

Ausgehend von diesem Stand der Technik ist es Aufgabe der Erfindung, eine abschmierfreie Bogenführung zu schaffen, mit der eine Beschädigung des Druckbildes des bewegten Bogens weitestgehend vermieden wird.Based on this prior art, it is an object of the invention to provide a smear-free sheet guide, with the damage to the printed image of the moving sheet is largely avoided.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des 1. Anspruchs gelöst.According to the invention, this object is achieved by the features of the first claim.

Weitere vorteilhafte Ausgestaltungen sind in den Unteransprüchen enthalten.Further advantageous embodiments are contained in the subclaims.

Durch die Gestaltung Bogenleiteinrichtung, bestehend aus einem Behälter zur Aufnahme eines flüssigen Trennmittels, der auf der dem Bogen zugewandten Seite eine Bogenleitfläche aufweist, in der Öffnungen vorgesehen sind, durch die Trennmittel aus dem Inneren des Behälters auf die Bogenleitfläche förderbar sind, kann in energiesparender Weise ein Trennmittelfilm erzeugt werden. Dieser verhindert wirkungsvoll das Abschmieren von Farbe. Als Trennmittel wird Wasser verwendet. Dem Wasser können Zusätze z.B. in Form von Tensiden beigemischt sein, die die Oberflächenspannung des Wassers erniedrigen. Der Trennmittelfilm wirkt zudem in der Art eines den Reibkoeffizienten zwischen Bogenleiteinrichtung und bedruckter Bogenseite vermindernden Schmiermittels, wodurch die mechanische Beanspruchung des bedruckten Bogens vermindert wird.By the design sheet guiding device consisting of a container for receiving a liquid release agent having on the side facing the sheet a Bogenleitfläche, are provided in the openings through which release agent from the interior of the container on the sheet guide can be conveyed, can in energy-saving manner a release agent film are generated. This effectively prevents the smearing of paint. The release agent used is water. The water may be admixed with additives, for example in the form of surfactants, which lower the surface tension of the water. The release film also acts as a kind of friction coefficient between the sheet guide and the printed sheet side decreasing lubricant, whereby the mechanical stress of the printed sheet is reduced.

Die Förderung des Trennmittels vom Behälterinneren auf die Bogenleitfläche kann unter der Wirkung von Kapillareffekten, der Saugwirkung von in den Öffnungen der Bogenleitfläche angeordneten Dochten oder unter der Wirkung eines im Behälter erzeugbaren Überdrucks erfolgen.
Die Verteilung des auf die Bogenleitfläche geförderten Trennmittels ist von den Wechselwirkungen zwischen den Trennmittelmolekülen und den Molekülen der Oberfläche der Bogenleitfläche abhängig. Bei einer bevorzugten Ausführungsform ist die Bogenleitfläche deshalb mit einer hydrophilen Oberfläche versehen. Dadurch wird erreicht, dass sich eine Trennschicht konstanter Dicke ausbildet. Durch die Ausgestaltung der hydrophilen Oberfläche in Form einer Schicht von modifizierten anorganischen nanokristallinen Partikeln lässt sich die Hydrophilie der Oberfläche derart steigern, dass bereits aus geringen Trennmittelmengen ein geschlossener, die gesamte Bogenleitfläche überziehender Trennmittelfilm geringster Schichtdicke entsteht. Bereits ein wenige Moleküllagen dicker wässriger Trennmittelfilm zwischen der Bogenleiteinrichtung und der mit Farbe bedruckten Seite des Bogens reicht aus, um die Probleme des Farbabschmierens an Bogenleiteinrichtungen im Bogenausleger und im Druckwerk bei beidseitig bedruckten Bogen weitestgehend zu vermeiden.
Die Hydrophilie der Bogenleitfläche wirkt als zudem Transportmechanismus für auskondensiertes Wasser entlang der Bogenleitfläche. Dieser Effekt erweist sich als besonders vorteilhaft, wenn der Trennmittelfilm durch Kontakt mit einer Folge von Bögen partiell gestört wird. Infolge der starken Hydrophilie der Bogenleitfläche wird die Trennmittelschicht bis zum Eintreffen des jeweiligen Folgebogens wieder vollständig regeneriert.The promotion of the release agent from the interior of the container to the sheet guide surface can take place under the effect of capillary effects, the suction of arranged in the openings of the sheet guide wicks or under the effect of a producible in the container overpressure.
The distribution of the release agent delivered to the sheet guide depends on the interactions between the release agent molecules and the molecules of the surface of the sheet guide surface. In a preferred embodiment, the sheet guide surface is therefore provided with a hydrophilic surface. This ensures that forms a release layer of constant thickness. The design of the hydrophilic surface in the form of a layer of modified inorganic nanocrystalline particles, the hydrophilicity of the surface can be increased so that even from small amounts of release agent a closed, the entire sheet guide surface coating release film of minimum thickness arises. Already a few molecule layers thick aqueous release agent film between the sheet guide and the color-printed side of the sheet is sufficient to avoid the problems of Farbabschmierens on sheet guiding devices in the sheet delivery and in the printing unit in both sides printed sheets as far as possible.
The hydrophilicity of the sheet guide surface acts as a transport mechanism for condensed water along the sheet guide surface. This effect proves to be particularly advantageous when the release agent film is partially disturbed by contact with a sequence of sheets. As a result of the strong hydrophilicity of the sheet guide surface, the release agent layer is completely regenerated until the arrival of the respective subsequent sheet.

Anhand eines Ausführungsbeispieles soll nachfolgend die Erfindung näher beschrieben werden.
In den dazugehörenden Zeichnungen zeigen

Fig. 1:
die schematische Darstellung einer Bogenleiteinrichtung in einem Bogenausleger mit Auslageverlängerung;
Fig. 2:
die Ausführung einer Bogenleiteinrichtung bei der die Förderung des Trennmittels durch Überdruck erfolgt;
Fig. 3:
die Ausführung einer Bogenleiteinrichtung bei der die Förderung des Trennmittels durch die Saugwirkung von Dochten erfolgt.
Reference to an embodiment, the invention will be described in more detail below.
In the accompanying drawings show
Fig. 1:
the schematic representation of a sheet guiding device in a sheet delivery with delivery extension;
Fig. 2:
the execution of a sheet guiding device in which the promotion of the release agent takes place by overpressure;
3:
the execution of a sheet guiding device in which the promotion of the release agent is carried out by the suction of wicks.

Die Erfindung soll anhand einer Bogenleiteinrichtung in einem Bogenausleger 1 beschrieben werden. Sie ist jedoch auch einsetzbar unter bogenführenden Zylindern im Druckwerk, wenn eine bedruckte Seite des Bogens 6 zur Bogenleiteinrichtung zeigt.The invention will be described with reference to a sheet guiding device in a sheet delivery 1. However, it can also be used under sheet-guiding cylinders in the printing unit, when a printed side of the sheet 6 to the sheet guiding device shows.

Fig. 1 zeigt in schematischer Darstellung eine Seitenansicht eines Bogenauslegers 1 mit Auslageverlängerung. Dargestellt sind das vordere und hintere Kettenumlenkrad 2, 3, über die die geschlossene Greiferkette 4 mit den Greifern 5 geführt wird. Die Greifer 5 dienen der Förderung des Bedruckstoffes, beispielsweise Bogen 6 zum Auslegerstapel 7. Dargestellt sind weiterhin die Saugwalze 8 und die vorderen Bogenanschläge 9. Im Bogenausleger 1 sind oberhalb des Fördertrums der Greiferkette 4 Trockner 10 angeordnet.
Unter der Greiferkette 4 unterhalb des Bogenförderweges ist die erfindungsgemäße Bogenleiteinrichtung vorgesehen, die den nachfolgend beschriebenen Aufbau aufweist.Fig. 1 shows a schematic representation of a side view of a sheet delivery 1 with delivery extension. Shown are the front and rear Kettenumlenkrad 2, 3, over which the closed gripper chain 4 is guided with the grippers 5. The gripper 5 are used to promote the printing material, such as sheet 6 to the delivery stack 7. Also shown are the suction roller 8 and the front sheet stops 9. In sheet delivery 1 4 dryer 10 are arranged above the conveying path of the gripper chain.
Under the gripper chain 4 below the Bogenförderweges the sheet guiding device according to the invention is provided which has the structure described below.

Die Bogenleiteinrichtung, die sich über die Breite des Bogenförderweges erstreckt, weist auf der dem Bogen 6 zugewandten Seite eine glatte Bogenleitfläche 11 auf. Wie in Figur 2 dargestellt, ist zur Aufnahme des flüssigen Trennmittels 10 ein flacher Behälter 13 vorgesehen. Dieser ist über Leitungen 16 mit einem Vorratstank 14 verbunden, aus dem der Behälter 13 mittels einer Pumpe 15 mit Trennmittel 10 gespeist wird. Neben dem Vorratstank 14 kann eine Einrichtung zur Aufbereitung des Trennmittels (in der Zeichnung nicht dargestellt) vorgesehen sein. Die Bogenleitfläche 11 bildet die Oberseite des Behälters 13 und ist von Öffnungen 12 durchbrochen, die regelmäßig angeordnet sind. Diese Öffnungen 12 können in einer ersten Ausführungsform mit entsprechend kleinem Durchmesser als Kapillaren ausgebildet sein, so dass das Trennmittel 10 unter der Wirkung des Kapillardrucks auf die Bogenleitfläche 11 gefördert wird.The sheet guiding device, which extends over the width of the Bogenförderweges, has on the sheet 6 side facing a smooth sheet guide surface 11. As shown in Figure 2, a flat container 13 is provided for receiving the liquid separating agent 10. This is connected via lines 16 to a storage tank 14, from which the container 13 is fed by means of a pump 15 with release agent 10. In addition to the storage tank 14, a device for the preparation of the release agent (not shown in the drawing) may be provided. The sheet guide surface 11 forms the top of the container 13 and is pierced by openings 12 which are arranged regularly. These openings 12 may be formed in a first embodiment with a correspondingly small diameter as capillaries, so that the release agent 10 is promoted under the action of the capillary pressure on the sheet guide surface 11.

Bei einer anderen bevorzugten Ausführungsform sind die Öffnungen demgegenüber vergrö-βert ausgeführt. Zur Förderung des Trennmittels 10 ist eine Pumpe 15 vorgesehen, durch die im Behälterinneren 13 ein Überdruck erzeugt wird. Zur Regulierung des Druckes kann im Leitungsweg 16 zusätzlich ein Ventil 19 angeordnet sein. Alternativ dazu kann der Überdruck auch durch die Regulierung der Förderleistung der Pumpe 15 eingestellt werden.In contrast, in another preferred embodiment, the openings are made enlarged. To promote the release agent 10, a pump 15 is provided through which an overpressure is generated in the container interior 13. To regulate the pressure, a valve 19 may additionally be arranged in the conduit 16. Alternatively, the overpressure can also be adjusted by regulating the delivery rate of the pump 15.

Bei einer weiteren Ausführungsform, dargestellt in Figur 3, sind in den Öffnungen 12 der Bogenleitfläche 11 Stopfen 17 aus elastischem Material angeordnet. Diese weisen eine durchgehende Öffnung auf, in der jeweils ein saugfähiger Docht 18 unter Klemmwirkung des elastischen Materials fixiert ist. An dem den Bogen 6 zugewandten Ende eines jeden Stopfens ist ein Absatz ausgebildet, der in korrespondierende Aussparungen in der Bogenleitfläche 11 einfügbar ist.In a further embodiment, shown in Figure 3, 11 plugs 17 are arranged in elastic material in the openings 12 of the sheet guide surface. These have a through opening, in each case an absorbent wick 18 under clamping action of the elastic Material is fixed. At the end of each plug, which faces the bend 6, a shoulder is formed, which can be inserted into corresponding recesses in the sheet guiding surface 11.

Bei allen beschriebenen Ausführungen kann die Bogenleitfläche 11 eine hydrophile Oberfläche aufweisen. Diese besteht aus mit Additiven modifizierten anorganischen nanokristallinen Partikeln oder einem anderen geeigneten Material. Die modifizierten anorganischen Nanosole setzen sich aus zwei Komponenten zusammen. Zur ersten Komponente gehören anorganische oxidische Nanopartikel von Elementen der II. - V. Haupt- und Nebengruppe des Periodensystems oder deren Gemische. Das sind vorzugsweise Nanopartikel, bestehend aus SiO2, TiO2; Al2O3 oder deren Gemische in wässrigen, alkoholischen oder daraus gemischten Lösungsmitteln.
Die zweite Komponente besteht aus dem Beschichtungsmaterial zumischbaren Additiven zur Erreichung des hydrophilen Verhaltens und Erhöhung der Oberflächenenergie der Beschichtung.In all the embodiments described, the sheet guiding surface 11 may have a hydrophilic surface. This consists of additives modified inorganic nanocrystalline particles or other suitable material. The modified inorganic nanosols are composed of two components. The first component includes inorganic oxide nanoparticles of elements of II. - V. Main and subgroup of the Periodic Table or mixtures thereof. These are preferably nanoparticles consisting of SiO 2 , TiO 2 ; Al 2 O 3 or mixtures thereof in aqueous, alcoholic or mixed solvents.
The second component consists of the coating material-immiscible additives to achieve the hydrophilic behavior and increase the surface energy of the coating.

Als Additive werden vorzugsweise eingesetzt:

  • ― Tensid-Verbindungen, bestehend aus langkettigen Alkyl- oder Fluoralkylresten mit mehr als 8 Kohlenstoffatomen und ein oder mehreren positiv oder negativ geladenen ionischen Endgruppen (z.B. 8% Cetyltrimethylammoniumbromid CTAB oder 2% Natriumdodecylsulfat oder 15% Perfluoralkylsulfonat FT2)
  • ― Polysiloxan-Verbindungen mit hydrophilen Seiten- oder Endgruppen, vorzugsweise Ethylenoxid- oder Alkoholgruppen (z.B. 16% Polysiloxan NM4 oder 50% Polysiloxan A200)
  • ― organische Polymere mit positiv oder negativ geladenen ionischen Seiten- oder Endgruppen (z.B. 2% Polystyrensulfonat 3000)
  • ― wasserlösliche Mono-, Oligo- und Polysaccharid-Verbindungen und Derivate (z.B. 20% Sorbit)
  • ― anorganische Iso- und Heteropolysäuren (z.B. 20% P2O5)
As additives are preferably used:
  • Surfactant compounds consisting of long-chain alkyl or fluoroalkyl radicals having more than 8 carbon atoms and one or more positively or negatively charged ionic end groups (eg 8% cetyltrimethylammonium bromide CTAB or 2% sodium dodecylsulfate or 15% perfluoroalkylsulfonate FT2)
  • Polysiloxane compounds having hydrophilic side or end groups, preferably ethylene oxide or alcohol groups (eg 16% polysiloxane NM4 or 50% polysiloxane A200)
  • Organic polymers with positively or negatively charged ionic side groups or end groups (eg 2% polystyrene sulfonate 3000)
  • Water-soluble mono-, oligo- and polysaccharide compounds and derivatives (eg 20% sorbitol)
  • - inorganic iso- and heteropolyacids (eg 20% P 2 O 5 )

Dabei können die oben genannten Additive einzeln oder in Kombination von zwei oder mehreren eingesetzt werden. Die Nanosolschicht kann in einfacher Weise im Sol-Gel-Verfahren erzeugt werden.The above-mentioned additives may be used singly or in combination of two or more. The nanosol layer can be easily produced in the sol-gel process.

Die Funktion der Bogenleiteinrichtung ist folgende:The function of the sheet guiding device is the following:

Die Bögen 6 werden im Greiferschluss durch die Maschine gefördert, so dass sie nahezu berührungslos bis zum Auslegerstapel 7 gelangen.
Der Erfindungsgegenstand wird wirksam bei Berührung des Bogens 6 mit der Bogenleitfläche 11.
Dazu wird aus dem Behälter 13 Trennmittel 10 auf die Bogenleitfläche 11 gefördert und spreitet zu einem Trennmittelfilm. Dieser bildet eine farbabstoßende Trennschicht, so dass eine frisch bedruckte Fläche bei Berührung mit dem Bogenleitblech 11 nicht abschmiert.The sheets 6 are conveyed in the gripper closure by the machine, so that they reach almost without contact to the delivery pile 7.
The subject invention is effective upon contact of the sheet 6 with the sheet guide 11th
For this purpose, release agent 10 is conveyed from the container 13 to the sheet guide surface 11 and spreads to a release agent film. This forms a color-repellent separating layer, so that a freshly printed surface does not smear in contact with the sheet guide plate 11.

BezugszeichenaufstellungREFERENCE NUMBERS

11
Bogenauslegersheet delivery
22
vorderes Kettenumlenkradfront derailleur
33
hinteres KettenumlenkradRear Kettenumlenkrad
44
Greiferkettegripper chain
55
Greifergrab
66
Bogenbow
77
Auslegerstapeldelivery pile
88th
Saugwalzesuction roll
99
Bogenanschlagsheet stop
1010
Trennmittelrelease agent
1111
Bogenleitflächesheet guide surface
1212
Öffnungenopenings
1313
Behältercontainer
1414
Vorratstankstorage tank
1515
Pumpepump
1616
Leitungencables
1717
StopfenPlug
1818
Dochtewicks
1919
VentilValve

Claims (14)

  1. Printing machine with a sheet feeder (1) and/or with a sheet guide cylinder, with a sheet guide device, on which a printed surface of the sheet (6) conveyed by grippers (5) shows and which is arranged in the optional sheet feeder (1) and/or under the optional sheet guide cylinder, wherein the sheet guide device consists of a container (13) and wherein the container (13) has on the side facing the sheet (6) a sheet guide surface (11) provided with openings (12), characterised in that a liquid separating agent (10) for avoidance of set-off of ink at the sheet guide surface (11) is receivable in the container (13) and that a conveying means is provided so that the separating agent can be conveyed through the openings (12) from the interior of the container (13) onto the sheet guide surface (11).
  2. Sheet guide device according to claim 1, wherein the sheet guide surface (11) has a hydrophilic surface.
  3. Sheet guide device according to claim 2, wherein a nano-sol layer of anorganic nano-crystalline particles modified by additives is provided as hydrophilic surface (19).
  4. Sheet guide device according to claim 3, wherein the nano-crystalline particles consist of silicone oxide, titanium oxide or aluminium oxide or of mixtures of the said oxides.
  5. Sheet guide device according to claim 3 or 4, wherein surfactant compounds of long-chain alkyl or fluoralkyl residues with more than 8 carbon atoms and one or more positively or negatively charged ionic end groups are used as additives.
  6. Sheet guide device according to claim 3 or 4, wherein polysiloxane compounds with hydrophilic side groups or end groups, preferably ethylene oxide groups or alcohol groups, are used as additives.
  7. Sheet guide device according to claim 3 or 4, wherein water soluble monosaccharide, oligosaccharide and polysaccharide compounds and derivatives are used as additives.
  8. Sheet guide device according to claim 3 or 4, wherein anorganic isopoly and heteropoly acids are used as additives.
  9. Sheet guide device according to one of claims 1 to 8, wherein the openings (12) are so dimensioned that the conveying of the separating agent (19) on the sheet guide surface (11) takes place under the action of capillary pressure, wherein the openings (12) form the conveying means.
  10. Sheet guide device according to one of claims 1 to 8, wherein wicks (18) producing conveying of the separating agent (10) are arranged as conveying means in the openings (12).
  11. Sheet guide device according to claim 10, wherein the openings (12) in the sheet guide surface (11) are lined with plugs of resilient material, which have a passage opening in which are fixed the wicks (18) forming the conveying means.
  12. Sheet guide device according to one of claims 1 to 8, wherein conveying means are provided, by which there can be produced in the container (13) an excess pressure producing conveying of the separating agent (10) onto the sheet guide surface (11).
  13. Sheet guide device according to one of the preceding claims, wherein the container (13) is equipped with a device for preparation of the separating agent (10).
  14. Sheet guide device according to one of the preceding claims, wherein an aqueous solution, which contains additives reducing the surface tension, is provided as separating agent (10).
EP20030006277 2002-04-20 2003-03-21 Sheet guiding device Expired - Lifetime EP1354703B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10217708 2002-04-20
DE2002117708 DE10217708A1 (en) 2002-04-20 2002-04-20 sheet guiding device

Publications (3)

Publication Number Publication Date
EP1354703A2 EP1354703A2 (en) 2003-10-22
EP1354703A3 EP1354703A3 (en) 2004-10-27
EP1354703B1 true EP1354703B1 (en) 2006-05-24

Family

ID=28458945

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20030006277 Expired - Lifetime EP1354703B1 (en) 2002-04-20 2003-03-21 Sheet guiding device

Country Status (2)

Country Link
EP (1) EP1354703B1 (en)
DE (2) DE10217708A1 (en)

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE263343C (en) *
US1336995A (en) * 1919-07-31 1920-04-13 Allen B Beck Device for preventing offset in printing-presses
US3686771A (en) * 1970-07-23 1972-08-29 Polygraph Leipzig Humidity regulating system for printing machines
US4312268A (en) * 1979-12-10 1982-01-26 The Standard Register Company Apparatus and method for coating of inks applied at high speed
DE3422443C2 (en) * 1984-06-16 1989-11-23 Heidelberger Druckmaschinen Ag, 6900 Heidelberg Foil for sheet-guiding cylinders and drums in rotary offset printing machines
DE3644446A1 (en) * 1986-12-24 1988-07-07 Roland Man Druckmasch Device for preventing sheets being lifted from a cylinder of a printing machine
DE4200767A1 (en) * 1991-11-21 1993-05-27 Windmoeller & Hoelscher PRINTING MACHINE
DE4341566B4 (en) * 1993-12-07 2005-03-10 Heidelberger Druckmasch Ag Release agent layers for surface protection of freshly printed sheets and apparatus for coating the freshly printed sheets with the release agent layer
DE19716424B4 (en) * 1997-04-18 2004-08-26 Koenig & Bauer Ag Device for preventing ink from depositing on cylinders of printing machines

Also Published As

Publication number Publication date
EP1354703A2 (en) 2003-10-22
DE50303426D1 (en) 2006-06-29
EP1354703A3 (en) 2004-10-27
DE10217708A1 (en) 2003-11-06

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