EP0527316B1 - Web cleaning device for cleaning a web to be printed - Google Patents

Web cleaning device for cleaning a web to be printed Download PDF

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Publication number
EP0527316B1
EP0527316B1 EP92110882A EP92110882A EP0527316B1 EP 0527316 B1 EP0527316 B1 EP 0527316B1 EP 92110882 A EP92110882 A EP 92110882A EP 92110882 A EP92110882 A EP 92110882A EP 0527316 B1 EP0527316 B1 EP 0527316B1
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EP
European Patent Office
Prior art keywords
web
printing paper
cloth
washing
printing
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
EP92110882A
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German (de)
French (fr)
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EP0527316A1 (en
Inventor
Herbert Stanka
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.)
Baldwin Gegenheimer GmbH
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Baldwin Gegenheimer GmbH
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Publication date
Application filed by Baldwin Gegenheimer GmbH filed Critical Baldwin Gegenheimer GmbH
Publication of EP0527316A1 publication Critical patent/EP0527316A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
    • B41F23/002—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing cleaning devices for sheets or webs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/24—Wiping devices using rolls of cleaning cloth
    • B41P2235/246—Pressing the cleaning cloth against the cylinder

Definitions

  • the invention relates to a web cleaning system for cleaning a web to be printed before it runs into the printing unit of a web printing machine.
  • the web can be cleaned on one side or on both sides.
  • Dust and other dirt particles are deposited on the web to be printed, especially if the web is electrostatically charged due to friction or other influences. Such dirt particles deteriorate the print quality and reduce the service life of the printing blankets (blankets) and the printing unit.
  • Known devices for cleaning the web before the web is printed in a printing unit consist of suction nozzles, the dirt particles from both sides of the web suck off. It is also possible to use brushes to brush off the web. Both known possibilities have the disadvantage that they scratch the surface of the web and thereby fibers of the web are raised, which are then torn off in the printing unit and adversely affect the printing blanket and the printing quality.
  • the web to be printed is usually a paper web.
  • the web can also consist of other materials or be coated with, for example, aluminum or plastic.
  • the object of the invention is to improve the print quality, to extend the operating time until the printing blankets are cleaned, and to extend the service life of the printing blankets and the printing units by avoiding dirt particles.
  • Fig. 1 shows schematically in dash-dotted lines a printing unit 2, to which a web 6 to be printed is fed in the direction of arrows 8 from a feed unit 4.
  • a web cleaning system 14 is integrated in the feed mechanism 4 and serves to clean the printing web 6 to be printed on one side 16 of the web section 18 located between the rollers 10 and 12.
  • the printing web 6 to be printed can be made of paper or another material or a multi-layer web consist of the same or different materials.
  • the web 6 to be printed can be a paper web coated with plastic.
  • the web cleaning system 14 contains a washing cloth 20 which is approximately as wide as the printing web 6 to be printed.
  • the washing cloth 20 can be a single-layer or multi-layer cloth and consists, for example, of wool, leather or preferably non-woven. It is important that the washcloth 20 consists of such a material or is of such a nature that it can store liquid on its side 22 to be applied to the printing web 6 and this liquid forms a lubricating film on contact with the printing web 6 and the transfer of Dirt particles from the printing web 6 supported on the washcloth 20.
  • the washcloth 20 has a very long length and is unwound from a clean cloth roll 24 and wound onto a dirty cloth roll 28 driven by a motor 26 in the direction of an arrow 30. During the winding process, the wash cloth section 32 located between these two rollers 24 and 28 can be lifted off the printing web 6.
  • a positioning device 34 which contains a membrane 36, which is expandable in the direction of the web section 18, and a compressed air source 38 are used to contact the washcloth section 32 with the web section 18 and for decontacting. Compressed air from the compressed air source 38 generates a pressure in a pressure chamber 40 which urges the membrane towards the web section 18.
  • the membrane 36 is elastic, so that when the pressure in the pressure chamber 40 is reduced, it recedes from the web section 18 and thereby causes the washcloth section 32 to be decontacted from the web section 18.
  • the washing cloth is preferably not wound onto the roll of dirty cloth by the motor 26, but is kept at a standstill when it contacts the printing web 6 to be cleaned and subsequently printed in its section 18.
  • At least a small relative movement for the wiping action is required between the wash cloth 20 and the printing web 6.
  • This relative movement can be generated by the movement of the printing web 6 relative to the fixed washing cloth 20 or by movements of the printing web 6 and the washing cloth 20.
  • the cleaning effect is enhanced if, according to the invention, the washcloth 20 is moist, at least in its washcloth section 32, on its side 22 facing the printing web 6.
  • the washcloth 20 can already be damp on the cleaning cloth roll 24.
  • the moistening device 42 moistens the washcloth 20 over its entire width.
  • the moistening device 42 can be a tube 44 with a plurality of nozzles 46, through which a contact liquid, preferably water, is applied, eg sprayed, onto the washcloth section 32, which is next moved onto the membrane 36. Wetting or impregnation of the washcloth 20 is also possible through an essentially pressure-free supply of liquid, for example via a slit opening, or according to the wick principle, self-sucking.
  • the arrangement according to FIG. 1 is made such that the web section 18 is different up and down, and the washcloth section 32 moves from the bottom up.
  • the washcloth 20 is preferably only moved when it does not contact the printing web 6.
  • the print web 6 On the printing web 6 there are particles deposited by gravity and, if the printing web 6 is electrostatically charged, also dirt particles held by electrostatic attraction.
  • the print web 6 is electrically discharged for better cleaning action and also to avoid subsequent subsequent contamination. This discharge takes place via the contacted wet washcloth section 32 to an earth connection 48.
  • the earth connection 48 can e.g. be formed by an electrode extending transversely to the washcloth and touching the wet washcloth 20. Because of the moisture and due to dirt, the dirt side of the washcloth 20 is highly conductive. So that the electrode 48 does not wipe off the dirt, it can be arranged on the clean side of the washing cloth 20 according to FIG. 1.
  • the wash cloth 20 is an endless belt 20/2, which runs over rollers 51, 52, 53 and 54, of which the roller 51 is driven by a motor 56, for example.
  • the rollers 52 and 54 serve as positioning means in that they can be moved by an adjusting device 58 perpendicular to the web section 18 relative to it for contacting the washcloth section 32 with this web section 18.
  • the moistening device 42 is used to moisten the washcloth section 32.
  • a grounding connection 48 again serves to ground the washcloth section 32.
  • the endless washcloth 20/2 can circulate several times. It is expedient to clean the washcloth 20/2 before each cycle using a cleaning device 60.
  • the cleaning device 60 can Suction nozzle 61 on the dirt side and / or a blow nozzle 63 on the clean side of the washcloth 20/2 and / or a rotating brush 62 which gives dirt particles brushed off from the washcloth 20/2 into a collecting container 64.
  • the embodiment shown in Fig. 2 contains a further variant in the form of a second positioning means or actuator 66, with which the roller 10 of the printing web 6 can be moved relative to the rollers 51 to 54 of the washcloth 20/2 around the web section 18 to contact or to decontact with the washcloth section 32 on the circumference of the roller 54.
  • the web section 18 of the printing web 6 is advanced or moved back by the second positioning means 66 in accordance with the double arrow 68 shown in FIG. 2.
  • the printing web 6 to be printed is shown as a solid line in its position, in which it contacts the washcloth 20 in the washcloth section 32, and also in dashed lines in the position at which they do not contact the washcloth 20. If no machine parts are arranged below the washcloth section 32, which contacts the web 6, or for any other reason there is no danger that dirt particles falling off the washcloth section 32 can result in machine parts becoming soiled, then the web 6 can also correspond to an arrow 70 be moved up instead of down.
  • the second positioning means 66 from FIG. 2 can again be provided in the embodiment shown in FIG. 3.
  • the washcloth 20 has a very large finite length and runs from a clean cloth roll 24 to a dirty cloth roll 28.
  • the guide plate 72 can also be used in connection with an endless wash cloth 20/2 from FIG. 2.
  • the baffle 72 can be provided with the ground connection 48.
  • the positioning means for positioning the washing cloth 20 or 20/2 relative to the printing web 6, or the printing web 6 relative to the washing cloth 20 or 20/2 can, in addition to the means mentioned, also be pneumatic cylinders, hydraulic cylinders, eccentrics and springs.
  • the web cleaning system 14 is preferably switched on and off at the same time and automatically when the printing unit 2 is switched on and off. Contacting and de-contacting the washcloth 20 or 20/2 with the printing web 6 is likewise carried out automatically in specific time periods.
  • FIG. 4 shows an embodiment of a web cleaning system in which a wash cloth 20 (or 20/2) is arranged on each of the two web sides 16 and 116 of the web 6 to be printed.
  • a wash cloth 20 or 20/2
  • FIG. 4 parts corresponding to FIG. 1 are provided with the same reference numbers as in FIG. 1.
  • the printing web 6 is guided over the rollers 10 and 12 on one path.
  • the wrap angle over which the Printing web 6 wraps around or contacts the rollers 10 and 12 and the washcloth section 32 can be varied by positioning the rolls 10, 12 and / or the washcloth section 32.
  • the moisture content of the printing web 6 can be measured by sensors 80, 81 before cleaning and by sensors 82 and 83 after cleaning. Depending on the measured moisture content, the supply of dampening liquid to the printing web 6, e.g. via the moistening device 42, controlled or regulated.
  • An electrically highly conductive liquid is preferably used to moisten the printing web 6, e.g. Water or a liquid suitable for offset printing.

Abstract

A web cleaning device for cleaning a web (6) to be printed before it runs into the printing unit (2) of a web-fed printing machine. At least one washing cloth (20), which is brought into contact with the printing web (6) by positioning means (34), serves for cleaning the printing web (6). A conveying device (26, 24, 28) conveys the washing cloth (20) in such a way that different moist sections (32) of the washing cloth are brought successively into contact with the printing web (6). <IMAGE>

Description

Die Erfindung betrifft eine Bahnreinigungsanlage zur Reinigung einer zu bedruckenden Bahn, bevor sie in das Druckwerk einer Rollendruckmaschine läuft.The invention relates to a web cleaning system for cleaning a web to be printed before it runs into the printing unit of a web printing machine.

Die Bahn kann auf einer Seite oder auf beiden Seiten gereinigt werden.The web can be cleaned on one side or on both sides.

Auf der zu bedruckenden Bahn lagern sich Staub und andere Schmutzpartikel ab, insbesondere dann, wenn die Bahn durch Reibung oder andere Einflüsse elektrostatisch aufgeladen ist. Solche Schmutzpartikel verschlechtern die Druckqualität und verringern die Lebensdauer der Drucktücher (Gummitücher) und des Druckwerkes.Dust and other dirt particles are deposited on the web to be printed, especially if the web is electrostatically charged due to friction or other influences. Such dirt particles deteriorate the print quality and reduce the service life of the printing blankets (blankets) and the printing unit.

Bekannte Vorrichtungen zum Reinigen der Bahn, bevor die Bahn in einem Druckwerk bedruckt wird, bestehen aus Saugdüsen, die von beiden Seiten der Bahn Schmutzpartikel absaugen. Auch ist es möglich, Bürsten zum Abbürsten der Bahn zu verwenden. Beide bekannten Möglichkeiten haben den Nachteil, daß sie die Bahnoberfläche aufkratzen und dadurch Fasern der Bahn hochgestellt werden, die dann im Druckwerk abgerissen werden und das Drucktuch sowie die Druckqualität beeinträchtigen. Die zu bedruckende Bahn ist meistens eine Papierbahn. Die Bahn kann jedoch auch aus anderen Materialien bestehen oder mit z.B. Alu bzw. Kunststoff beschichtet sein.Known devices for cleaning the web before the web is printed in a printing unit consist of suction nozzles, the dirt particles from both sides of the web suck off. It is also possible to use brushes to brush off the web. Both known possibilities have the disadvantage that they scratch the surface of the web and thereby fibers of the web are raised, which are then torn off in the printing unit and adversely affect the printing blanket and the printing quality. The web to be printed is usually a paper web. However, the web can also consist of other materials or be coated with, for example, aluminum or plastic.

Durch die Erfindung soll die Aufgabe gelöst werden, die Druckqualität zu verbessern, die Betriebszeit bis zur Reinigung der Drucktücher zu verlängern, und die Lebensdauer der Drucktücher und der Druckwerke durch Vermeidung von Schmutzpartikeln zu verlängern.The object of the invention is to improve the print quality, to extend the operating time until the printing blankets are cleaned, and to extend the service life of the printing blankets and the printing units by avoiding dirt particles.

Diese Aufgabe wird gemäß der Erfindung durch die kennzeichnenden Merkmale von Anspruch 1 gelöst.This object is achieved according to the invention by the characterizing features of claim 1.

Weitere Merkmale der Erfindung sind in den Unteransprüchen enthalten.Further features of the invention are contained in the subclaims.

Die Erfindung wird im folgenden mit Bezug auf die Zeichnungen anhand von bevorzugten Ausführungsformen als Beispiele beschrieben. In den Zeichnungen zeigen

Fig. 1
schematisch eine Seitenansicht einer Bahnreinigungsanlage nach der Erfindung, die einem Druckwerk vorgeschaltet ist und in ein Einzugswerk integriert ist,
Fig. 2
eine schematische Seitenansicht einer weiteren Bahnreinigungsanlage nach der Erfindung,
Fig. 3
schematisch eine Seitenansicht einer nochmals weiteren Ausführungsform einer Bahnreinigungsanlage nach der Erfindung,
Fig. 4
eine schematische Seitenansicht einer Bahnreinigungsanlage nach der Erfindung zum beidseitigen Reinigen einer zu bedruckenden Bahn.
The invention is described below with reference to the drawings using preferred embodiments as examples. Show in the drawings
Fig. 1
schematically a side view of a web cleaning system according to the invention, which is connected upstream of a printing unit and integrated into a feed unit,
Fig. 2
2 shows a schematic side view of a further web cleaning installation according to the invention,
Fig. 3
schematically a side view of yet another embodiment of a web cleaning system according to the invention,
Fig. 4
is a schematic side view of a web cleaning system according to the invention for cleaning a web to be printed on both sides.

Fig. 1 zeigt schematisch in strichpunktierten Linien ein Druckwerk 2, welchem von einem Einzugswerk 4 eine zu bedruckende Bahn 6 in Richtung von Pfeilen 8 zugeführt wird. Vom Einzugswerk 4 sind nur zwei die Bahn 6 transportierende Transportwalzen 10 und 12 dargestellt. Eine Bahnreinigungsanlage 14 ist in das Einzugswerk 4 integriert und dient zum Reinigen der zu bedruckenden Druckbahn 6 auf der einen Seite 16 des zwischen den Walzen 10 und 12 gelegenen Bahnabschnittes 18. Die zu bedruckende Druckbahn 6 kann aus Papier oder einem anderen Material oder einer mehrlagigen Bahn aus gleichen oder verschiedenen Materialien bestehen. Beispielsweise kann die zu bedruckende Bahn 6 eine mit Kunststoff beschichtete Papierbahn sein.Fig. 1 shows schematically in dash-dotted lines a printing unit 2, to which a web 6 to be printed is fed in the direction of arrows 8 from a feed unit 4. Of the feed mechanism 4, only two transport rollers 10 and 12 transporting the web 6 are shown. A web cleaning system 14 is integrated in the feed mechanism 4 and serves to clean the printing web 6 to be printed on one side 16 of the web section 18 located between the rollers 10 and 12. The printing web 6 to be printed can be made of paper or another material or a multi-layer web consist of the same or different materials. For example, the web 6 to be printed can be a paper web coated with plastic.

Die Bahnreinigungsanlage 14 enthält ein Waschtuch 20, welches ungefähr so breit ist wie die zu bedruckende Druckbahn 6. Das Waschtuch 20 kann ein einlagiges oder mehrlagiges Tuch sein und besteht beispielsweise aus Wolle, Leder oder vorzugsweise Vlies. Wichtig ist, daß das Waschtuch 20 aus einem solchen Material besteht oder von einer solchen Beschaffenheit ist, daß es auf seiner an die Druckbahn 6 anzulegenden Seite 22 Flüssigkeit speichern kann und diese Flüssigkeit bei Kontakt mit der Druckbahn 6 einen Schmierfilm bildet und die Übertragung von Schmutzpartikeln von der Druckbahn 6 auf das Waschtuch 20 unterstützt. Das Waschtuch 20 hat eine sehr große Länge und wird von einer Saubertuchrolle 24 abgewickelt und auf eine durch einen Motor 26 angetriebene Schmutztuchrolle 28 in Richtung eines Pfeiles 30 aufgewickelt. Für die Zeit dieses Wickelvorganges kann der zwischen diesen beiden Rollen 24 und 28 gelegene Waschtuchabschnitt 32 von der Druckbahn 6 abgehoben werden.The web cleaning system 14 contains a washing cloth 20 which is approximately as wide as the printing web 6 to be printed. The washing cloth 20 can be a single-layer or multi-layer cloth and consists, for example, of wool, leather or preferably non-woven. It is important that the washcloth 20 consists of such a material or is of such a nature that it can store liquid on its side 22 to be applied to the printing web 6 and this liquid forms a lubricating film on contact with the printing web 6 and the transfer of Dirt particles from the printing web 6 supported on the washcloth 20. The washcloth 20 has a very long length and is unwound from a clean cloth roll 24 and wound onto a dirty cloth roll 28 driven by a motor 26 in the direction of an arrow 30. During the winding process, the wash cloth section 32 located between these two rollers 24 and 28 can be lifted off the printing web 6.

Zum Kontaktieren des Waschtuchabschnittes 32 mit dem Bahnabschnitt 18, und zur Dekontaktierung, dient eine Positioniervorrichtung 34, welche eine in Richtung zum Bahnabschnitt 18 hin expandierbare Membran 36 und eine Druckluftquelle 38 enthält. Druckluft der Druckluftquelle 38 erzeugt in einer Druckkammer 40 einen die Membran in Richtung zum Bahnabschnitt 18 drängenden Druck. Die Membran 36 ist elastisch, so daß sie bei Reduzierung des Druckes in der Druckkammer 40 vom Bahnabschnitt 18 zurückweicht und dabei eine Dekontaktierung des Waschtuchabschnittes 32 von dem Bahnabschnitt 18 bewirkt. Vorzugsweise wird das Waschtuch nicht vom Motor 26 auf die Schmutztuchrolle gewickelt, sondern in Stillstand gehalten, wenn es die zu reinigende und anschließend zu bedruckende Druckbahn 6 in deren Abschnitt 18 kontaktiert. Zwischen dem Waschtuch 20 und der Druckbahn 6 ist zumindest eine kleine Relativbewegung für die Abwischwirkung erforderlich. Diese Relativbewegung kann durch die Bewegung der Druckbahn 6 relativ zum feststehenden Waschtuch 20 oder durch Bewegungen der Druckbahn 6 und des Waschtuches 20 erzeugt werden. Die Reinigungswirkung wird verstärkt, wenn gemäß der Erfindung das Waschtuch 20 zumindest in seinem Waschtuchabschnitt 32 auf seiner der Druckbahn 6 zugewandten Seite 22 feucht ist. Das Waschtuch 20 kann bereits auf der Saubertuchrolle 24 feucht sein. Bei der in Fig. 1 dargestellten Ausführungsform ist jedoch der auf die Saubertuchrolle 24 aufgewickelte Abschnitt des Waschtuches 20 trocken, und es wird nur der Waschtuchabschnitt 32 durch eine Befeuchtungsvorrichtung 42 mit Flüssigkeit, vorzugsweise Wasser, befeuchtet, der automatisch durch den Motor 26 als nächstes auf die Membran 36 bewegt und anschließend in dieser Position mit dem Bahnabschnitt 18 kontaktiert werden soll. Die Membran 36 erstreckt sich über die gesamte Breite des Waschtuches 20 und damit auch über die gesamte Breite der Druckbahn 6. Die Befeuchtungsvorrichtung 42 befeuchtet das Waschtuch 20 über seine gesamte Breite. Die Befeuchtungsvorrichtung 42 kann ein Rohr 44 mit einer Vielzahl von Düsen 46 sein, durch welche eine Kontaktflüssigkeit, vorzugsweise Wasser, auf den Waschtuchabschnitt 32 aufgebracht, z.B. aufgesprüht wird, der als nächstes auf die Membran 36 bewegt wird. Eine Benetzung oder Tränkung des Waschtuches 20 ist auch durch eine im wesentlichen drucklose Flüssigkeitszufuhr, z.B. über eine Schlitzöffnung, oder nach dem Dochtprinzip, selbstsaugend, möglich.A positioning device 34, which contains a membrane 36, which is expandable in the direction of the web section 18, and a compressed air source 38 are used to contact the washcloth section 32 with the web section 18 and for decontacting. Compressed air from the compressed air source 38 generates a pressure in a pressure chamber 40 which urges the membrane towards the web section 18. The membrane 36 is elastic, so that when the pressure in the pressure chamber 40 is reduced, it recedes from the web section 18 and thereby causes the washcloth section 32 to be decontacted from the web section 18. The washing cloth is preferably not wound onto the roll of dirty cloth by the motor 26, but is kept at a standstill when it contacts the printing web 6 to be cleaned and subsequently printed in its section 18. At least a small relative movement for the wiping action is required between the wash cloth 20 and the printing web 6. This relative movement can be generated by the movement of the printing web 6 relative to the fixed washing cloth 20 or by movements of the printing web 6 and the washing cloth 20. The cleaning effect is enhanced if, according to the invention, the washcloth 20 is moist, at least in its washcloth section 32, on its side 22 facing the printing web 6. The washcloth 20 can already be damp on the cleaning cloth roll 24. At the in However, the embodiment shown in FIG. 1 is that the portion of the washcloth 20 wound on the cleaning cloth roll 24 is dry, and only the washcloth portion 32 is moistened with liquid, preferably water, by a moistening device 42, which is automatically next applied to the membrane 36 by the motor 26 moved and then contacted in this position with the web section 18. The membrane 36 extends over the entire width of the washcloth 20 and thus also over the entire width of the printing web 6. The moistening device 42 moistens the washcloth 20 over its entire width. The moistening device 42 can be a tube 44 with a plurality of nozzles 46, through which a contact liquid, preferably water, is applied, eg sprayed, onto the washcloth section 32, which is next moved onto the membrane 36. Wetting or impregnation of the washcloth 20 is also possible through an essentially pressure-free supply of liquid, for example via a slit opening, or according to the wick principle, self-sucking.

Damit die vom Waschtuch 20 von der Druckbahn 6 abgewischten Schmutzpartikel nicht in den Einlaufspalt zwischen einer Walze, z.B. der Walze 12 des Einzugwerkes 4, und die Druckbahn 6 fallen können, ist die Anordnung gemäß Fig. 1 so getroffen, daß der Bahnabschnitt 18 sich von oben nach unten, und der Waschtuchabschnitt 32 von unten nach oben bewegt. Das Waschtuch 20 wird jedoch vorzugsweise nur dann bewegt, wenn es die Druckbahn 6 nicht kontaktiert. Es ist jedoch auch möglich, das Waschtuch 20 auch während der in Fig. 1 gezeigten Kontaktposition zu transportieren, während es die Druckbahn 6 kontaktiert, jedoch muß zwischen der Druckbahn 6 und dem Waschtuch 20 immer eine Relativbewegung vorhanden sein, wenn eine "Abwischwirkung" erzielt werden soll.So that the dirt particles wiped from the wash cloth 20 from the printing web 6 cannot fall into the inlet gap between a roller, for example the roller 12 of the feed mechanism 4, and the printing web 6, the arrangement according to FIG. 1 is made such that the web section 18 is different up and down, and the washcloth section 32 moves from the bottom up. However, the washcloth 20 is preferably only moved when it does not contact the printing web 6. However, it is also possible to transport the washcloth 20 while it is in contact with the printing web 6, even if it is in the contact position shown in FIG. 1, but there must always be a relative movement between the printing web 6 and the washcloth 20 if there is a "wiping effect". should be achieved.

Auf der Druckbahn 6 befinden sich durch Schwerkraft abgesetzte Partikel und, wenn die Druckbahn 6 elektrostatisch aufgeladen ist, auch durch elektrostatische Anziehung festgehaltene Schmutzpartikel. Zur besseren Reinigungswirkung, und auch zur Vermeidung einer anschließenden erneuten Verschmutzung, wird die Druckbahn 6 elektrisch entladen. Diese Entladung erfolgt über den kontaktierten feuchten Waschtuchabschnitt 32 zu einem Erdungsanschluß 48. Der Erdungsanschluß 48 kann z.B. durch eine zum Waschtuch quer sich erstreckende, das feuchte Waschtuch 20 berührende Elektrode gebildet sein. Wegen der Feuchtigkeit und wegen aufgenommenem Schmutz ist die Schmutzseite des Waschtuches 20 gut leitend. Damit die Elektrode 48 den Schmutz nicht abstreift, kann sie auf der Sauberseite des Waschtuches 20 gemäß Fig. 1 angeordnet werden.On the printing web 6 there are particles deposited by gravity and, if the printing web 6 is electrostatically charged, also dirt particles held by electrostatic attraction. The print web 6 is electrically discharged for better cleaning action and also to avoid subsequent subsequent contamination. This discharge takes place via the contacted wet washcloth section 32 to an earth connection 48. The earth connection 48 can e.g. be formed by an electrode extending transversely to the washcloth and touching the wet washcloth 20. Because of the moisture and due to dirt, the dirt side of the washcloth 20 is highly conductive. So that the electrode 48 does not wipe off the dirt, it can be arranged on the clean side of the washing cloth 20 according to FIG. 1.

Bei der in Fig. 2 dargestellten weiteren Ausführungsform nach der Erfindung ist das Waschtuch 20 ein endloses Band 20/2, welches über Rollen, 51, 52, 53 und 54 läuft, von welchen beispielsweise die Rolle 51 von einem Motor 56 angetrieben wird. Dabei dienen die Rollen 52 und 54 als Positioniermittel, indem sie durch eine Stellvorrichtung 58 senkrecht zum Bahnabschnitt 18 relativ zu ihm zur Kontaktierung des Waschtuchabschnittes 32 mit diesem Bahnabschnitt 18 bewegbar sind. Zur Befeuchtung des Waschtuchabschnittes 32 dient die Befeuchtungsvorrichtung 42. Zur Erdung des Waschtuchabschnittes 32 dient wiederum ein Erdungsanschluß 48. Das endlose Waschtuch 20/2 kann mehrmals umlaufen. Dabei ist es zweckmäßig, das Waschtuch 20/2 vor jedem Umlauf durch eine Reinigungsvorrichtung 60 zu reinigen. Die Reinigungsvorrichtung 60 kann eine Saugdüse 61 auf der Schmutzseite und/oder eine Blasdüse 63 auf der Sauberseite des Waschtuches 20/2 und/oder eine rotierende Bürste 62 sein, die vom Waschtuch 20/2 abgebürstete Schmutzpartikel in einen Auffangbehälter 64 gibt.In the further embodiment according to the invention shown in FIG. 2, the wash cloth 20 is an endless belt 20/2, which runs over rollers 51, 52, 53 and 54, of which the roller 51 is driven by a motor 56, for example. The rollers 52 and 54 serve as positioning means in that they can be moved by an adjusting device 58 perpendicular to the web section 18 relative to it for contacting the washcloth section 32 with this web section 18. The moistening device 42 is used to moisten the washcloth section 32. A grounding connection 48 again serves to ground the washcloth section 32. The endless washcloth 20/2 can circulate several times. It is expedient to clean the washcloth 20/2 before each cycle using a cleaning device 60. The cleaning device 60 can Suction nozzle 61 on the dirt side and / or a blow nozzle 63 on the clean side of the washcloth 20/2 and / or a rotating brush 62 which gives dirt particles brushed off from the washcloth 20/2 into a collecting container 64.

Die in Fig. 2 dargestellte Ausführungsform nach der Erfindung enthält eine weitere Variante in Form eines zweiten Positioniermittels oder Stellantriebes 66, mit welchem die Walze 10 der Druckbahn 6 relativ zu den Rollen 51 bis 54 des Waschtuches 20/2 bewegt werden kann, um den Bahnabschnitt 18 mit dem Waschtuchabschnitt 32 am Umfang der Rolle 54 zu kontaktieren oder zu dekontaktieren. Dabei wird der Bahnabschnitt 18 der Druckbahn 6 von den zweiten Positioniermitteln 66 entsprechend dem in Fig. 2 gezeigten Doppelpfeil 68 vorbewegt oder zurückbewegt.The embodiment shown in Fig. 2 according to the invention contains a further variant in the form of a second positioning means or actuator 66, with which the roller 10 of the printing web 6 can be moved relative to the rollers 51 to 54 of the washcloth 20/2 around the web section 18 to contact or to decontact with the washcloth section 32 on the circumference of the roller 54. The web section 18 of the printing web 6 is advanced or moved back by the second positioning means 66 in accordance with the double arrow 68 shown in FIG. 2.

Bei der in Fig. 3 dargestellten weiteren Ausführungsform einer Bahnreinigungsanlage nach der Erfindung ist die zu bedruckende Druckbahn 6 als ausgezogene Linie in ihrer Position dargestellt, bei welcher sie das Waschtuch 20 im Waschtuchabschnitt 32 kontaktiert, und außerdem in gestrichelten Linien in der Position, bei welcher sie das Waschtuch 20 nicht kontaktiert. Wenn unterhalb des Waschtuchabschnittes 32, welcher die Bahn 6 kontaktiert, keine Maschinenteile angeordnet sind oder aus einem anderen Grund keine Gefahr besteht, daß vom Waschtuchabschnitt 32 abfallende Schmutzpartikel eine Verschmutzung von Maschinenteilen zur Folge haben können, dann kann die Bahn 6 entsprechend einem Pfeil 70 auch nach oben statt nach unten bewegt werden. Zur Kontaktierung und Dekontaktierung können bei der in Fig. 3 dargestellten Ausführungsform wieder die zweiten Positioniermittel 66 von Fig. 2 vorgesehen sein. Bei der Ausführungsform von Fig. 3 läuft der mit der Druckbahn 6 zu kontaktierende Waschtuchabschnitt 32 über ein perforiertes Leitblech 72 mit einer Vielzahl von Bohrungen 74, durch welche das von Düsen 46 versprühte Wasser 76 entgegen der Waschtuchbewegungsrichtung 30 auf einen langen Befeuchtungs-Waschtuchabschnitt 78 verteilt wird. Das Waschtuch 20 hat eine sehr große endliche Länge und läuft von einer Saubertuchrolle 24 auf eine Schmutztuchrolle 28. Das Leitblech 72 kann jedoch auch in Verbindung mit einem endlosen Waschtuch 20/2 von Fig. 2 verwendet werden. Das Leitblech 72 kann mit dem Erdungsanschluß 48 versehen sein.In the further embodiment of a web cleaning system according to the invention shown in FIG. 3, the printing web 6 to be printed is shown as a solid line in its position, in which it contacts the washcloth 20 in the washcloth section 32, and also in dashed lines in the position at which they do not contact the washcloth 20. If no machine parts are arranged below the washcloth section 32, which contacts the web 6, or for any other reason there is no danger that dirt particles falling off the washcloth section 32 can result in machine parts becoming soiled, then the web 6 can also correspond to an arrow 70 be moved up instead of down. For contacting and decontacting, the second positioning means 66 from FIG. 2 can again be provided in the embodiment shown in FIG. 3. 3 is running the washcloth section 32 to be contacted with the printing web 6 via a perforated guide plate 72 with a multiplicity of bores 74 through which the water 76 sprayed by nozzles 46 is distributed to a long moistening washcloth section 78 against the direction of movement of the washcloth 30. The washcloth 20 has a very large finite length and runs from a clean cloth roll 24 to a dirty cloth roll 28. However, the guide plate 72 can also be used in connection with an endless wash cloth 20/2 from FIG. 2. The baffle 72 can be provided with the ground connection 48.

Die Positioniermittel zum Positionieren des Waschtuches 20 oder 20/2 relativ zur Druckbahn 6, oder der Druckbahn 6 relativ zum Waschtuch 20 oder 20/2, können, außer den genannten Mitteln, auch Pneumatikzylinder, Hydraulikzylinder, Exzenter und Federn sein.The positioning means for positioning the washing cloth 20 or 20/2 relative to the printing web 6, or the printing web 6 relative to the washing cloth 20 or 20/2, can, in addition to the means mentioned, also be pneumatic cylinders, hydraulic cylinders, eccentrics and springs.

Das Einschalten und Ausschalten der Bahnreinigungsanlage 14 erfolgt vorzugsweise jeweils gleichzeitig und automatisch mit dem Einschalten und Ausschalten des Druckwerkes 2. Das Kontaktieren und Dekontaktieren des Waschtuches 20 oder 20/2 mit der Druckbahn 6 erfolgt ebenfalls automatisch in bestimmten Zeitperioden.The web cleaning system 14 is preferably switched on and off at the same time and automatically when the printing unit 2 is switched on and off. Contacting and de-contacting the washcloth 20 or 20/2 with the printing web 6 is likewise carried out automatically in specific time periods.

Fig. 4 zeigt eine Ausführungsform einer Bahnreinigungsanlage, bei welcher auf beiden Bahnseiten 16 und 116 der zu bedruckenden Bahn 6 je ein Waschtuch 20 (oder 20/2) angeordnet ist. In Fig. 4 sind der Fig. 1 entsprechende Teile mit gleichen Bezugszahlen wie in Fig. 1 versehen.FIG. 4 shows an embodiment of a web cleaning system in which a wash cloth 20 (or 20/2) is arranged on each of the two web sides 16 and 116 of the web 6 to be printed. In FIG. 4, parts corresponding to FIG. 1 are provided with the same reference numbers as in FIG. 1.

Die Druckbahn 6 ist über die Walzen 10 und 12 auf einem Weg geführt. Der Umschlingungswinkel, über welchen die Druckbahn 6 die Walzen 10 und 12 und den Waschtuchabschnitt 32 umschlingt oder kontaktiert, kann durch Positionierung der Walzen 10, 12 und/oder des Waschtuchabschnittes 32 variiert werden.The printing web 6 is guided over the rollers 10 and 12 on one path. The wrap angle over which the Printing web 6 wraps around or contacts the rollers 10 and 12 and the washcloth section 32 can be varied by positioning the rolls 10, 12 and / or the washcloth section 32.

Der Feuchtigkeitsgehalt der Druckbahn 6 kann durch Sensoren 80, 81 vor der Reinigung und durch Sensoren 82 und 83 nach der Reinigung gemessen werden. In Abhängigkeit vom gemessenen Feuchtigkeitsgehalt wird die Zufuhr von Befeuchtungsflüssigkeit zur Druckbahn 6, z.B. über die Befeuchtungsvorrichtung 42, gesteuert oder geregelt. Zur Befeuchtung der Druckbahn 6 wird vorzugsweise eine elektrisch gut leitende Flüssigkeit verwendet, z.B. Wasser oder eine für den Offsetdruck geeignete Flüssigkeit.The moisture content of the printing web 6 can be measured by sensors 80, 81 before cleaning and by sensors 82 and 83 after cleaning. Depending on the measured moisture content, the supply of dampening liquid to the printing web 6, e.g. via the moistening device 42, controlled or regulated. An electrically highly conductive liquid is preferably used to moisten the printing web 6, e.g. Water or a liquid suitable for offset printing.

Claims (9)

  1. Device for cleaning a web of printing paper in a web-fed printing press upstream of a printing mechanism, containing at least one cleaning element (20, 20/2) on at least one side to be cleaned of the web of printing paper (6) in order to clean this side of the web while the cleaning element is in contact with the web of printing paper, whereby the cleaning element is a washing cloth (20, 20/2) which is moist at least within a washing-cloth section (32) that can be brought into contact with the web of printing paper (6); positioning means (34; 58, 52, 54; 66, 10) are provided for bringing the damp washing-cloth section (32) into contact with the web of printing paper; a transport device (24, 26, 28; 51 - 54, 56) for the transport of the washing cloth (20; 20/2) in or contrary to a direction in which the web of printing paper (6) is conveyed is provided in order to bring other damp washing-cloth sections (32) in turn into a contactable position opposite the web of printing paper (6); and the functions of the positioning means (34; 58, 52, 54; 66, 10) and of the transport device (24, 26, 28; 51- 54, 56) are coordinated with one another in such a way that with a view to cleaning the web of printing paper (6) said web of printing paper (6) slides on the damp washing-cloth section (32) in contact therewith.
  2. Device according to Claim 1, characterised in that the washing cloth (20; 20/2) is a fleece.
  3. Device according to Claim 1 or 2, characterised in that a moistening device (42) is provided which moistens the washing cloth (20; 20/2) with electrically conducting liquid.
  4. Device according to one of Claims 1 to 3, characterised in that the washing cloth (20; 20/2) and the web of printing paper (6) are capable of being moved relative to one another at least in a defined section and can thereby be brought into and out of contact automatically.
  5. Device according to one of Claims 1 to 4, characterised in that during the printing operation the washing cloth (20; 20/2) is in contact with the web of printing paper (6) but from time to time it is brought automatically out of contact with the web of printing paper (6) by the positioning means (34; 58, 52, 54; 66, 10), in that the washing cloth (20; 20/2) is transported by the transport device (24, 26, 28; 56, 51, 52, 53, 54) only within a such a time period during which the washing cloth does not contact the web of printing paper, and in that the transport device retains the washing cloth (20; 20/2) in non-transportable manner when the washing cloth contacts the web of printing paper (6).
  6. Device according to one of Claims 1 to 5, characterised in that the washing cloth (20; 20/2) is an endless web which is guided by rollers (51 to 54).
  7. Device according to one of Claims 1 to 6, characterised in that the washing cloth (20; 20/2) is earthed (48) at least on the washing-cloth section (32) in contact with the web of printing paper (6).
  8. Device according to one of Claims 1 to 7, characterised in that it is integrated into an intake mechanism (4) of a printing machine.
  9. Device according to one of Claims 1 to 8, characterised in that the moisture content of the web of printing paper (6) is measured by sensors (80, 81, 82, 83) for controlling or regulating the supply of liquid (42) to the web of printing paper (6).
EP92110882A 1991-08-14 1992-06-26 Web cleaning device for cleaning a web to be printed Expired - Lifetime EP0527316B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4126888A DE4126888A1 (en) 1991-08-14 1991-08-14 RAILWAY CLEANING SYSTEM FOR CLEANING A PRINTABLE RAILWAY
DE4126888 1991-08-14

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EP0527316A1 EP0527316A1 (en) 1993-02-17
EP0527316B1 true EP0527316B1 (en) 1995-10-11

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EP92110882A Expired - Lifetime EP0527316B1 (en) 1991-08-14 1992-06-26 Web cleaning device for cleaning a web to be printed

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US (1) US5289774A (en)
EP (1) EP0527316B1 (en)
JP (1) JPH0811441B2 (en)
AT (1) ATE128904T1 (en)
DE (2) DE4126888A1 (en)

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Also Published As

Publication number Publication date
ATE128904T1 (en) 1995-10-15
DE59203970D1 (en) 1995-11-16
JPH0811441B2 (en) 1996-02-07
EP0527316A1 (en) 1993-02-17
US5289774A (en) 1994-03-01
JPH05193112A (en) 1993-08-03
DE4126888A1 (en) 1993-02-18

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