EP0287822A1 - Device for removing foreign particles from the platen cylinder of an offset-printing press - Google Patents

Device for removing foreign particles from the platen cylinder of an offset-printing press Download PDF

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Publication number
EP0287822A1
EP0287822A1 EP88104524A EP88104524A EP0287822A1 EP 0287822 A1 EP0287822 A1 EP 0287822A1 EP 88104524 A EP88104524 A EP 88104524A EP 88104524 A EP88104524 A EP 88104524A EP 0287822 A1 EP0287822 A1 EP 0287822A1
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EP
European Patent Office
Prior art keywords
plate cylinder
base part
wipers
cylinder
pneumatic cylinders
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Granted
Application number
EP88104524A
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German (de)
French (fr)
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EP0287822B1 (en
Inventor
Werner Grossmann
Hans-Georg Herzing
Manfred Dipl.-Ing. Piltz
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F35/00—Cleaning arrangements or devices
    • B41F35/02—Cleaning arrangements or devices for forme cylinders
    • 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
    • B41P2235/40—Cleaning restricted areas on cylinders

Definitions

  • the invention relates to a device for removing dirt particles from the plate cylinder of an offset printing machine, which extends over the entire length of the plate cylinder and engages it in the area between the ink transfer to the blanket cylinder and the dampening application.
  • the plate cylinder In offset printing, the plate cylinder is always contaminated. These contaminants can be paper or cardboard fibers of the material to be printed, agglomerations or lumps originating from the printing ink, or air dust; they leave unprinted or color-free areas on the surface to be printed.
  • the printing machine is stopped and the dirt particles are removed by hand, or a tool is pressed against the rotating plate cylinder while the printing machine is running, which removes the dirt particles. While stopping the printing machine leads to a decrease in the printing capacity and an increase in the reject percentage, since rejects are inevitable each time the printing machine is started, reaching into the running printing machine, which is forbidden in itself, is very dangerous for the operator and also causes, since it an undesirable partial removal of color is only possible from the color application side.
  • the mechanical effort that makes it possible to convert the applicator roller into a cleaning tool is quite high; on the other hand, the cleaning success is by no means certain, since if the plate cylinder and applicator roller are not exactly parallel, removal of dirt particles over the entire cylinder length is no longer guaranteed.
  • the relatively low pressure of the application roller on the plate cylinder also contributes to this, which can lead to the fact that the dirt particle is only squeezed flat and not removed.
  • the invention is intended to provide a cleaning device which does not adhere to these deficiencies of the known devices, and which thus allows the plate cylinder to be cleaned safely and quickly and completely while the offset printing press is running, with a minimal proportion of rejects.
  • this object is achieved according to the invention in that a plurality of pneumatic cylinders are arranged distributed over the entire length of the plate cylinder, the non-rotatable piston rods of which have a stripper made of elastic material at their free end, two adjacent strippers being offset from one another and laterally are arranged overlapping and the stroke of each piston rod is slightly longer than the distance between the front edge of the retracted wipers and the surface of the plate cylinder.
  • the wipers form a closed front which covers the entire length of the plate cylinder and which can be brought against the surface thereof in sections while the offset printing machine is running. It is then sufficient if only a single dirt particle is present to extend the relevant section, but if there are several dirt particles distributed over the length of the plate cylinder, these can be removed by simultaneously extending several sections in one go.
  • the offset and laterally overlapping arrangement of the wipers prevents the formation of a dead zone between adjacent wipers.
  • the dimensioning of the stroke path ensures that the extended scraper is firmly pressed against the plate cylinder at all times, the elasticity of the scraper material in conjunction with the flexibility of the pneumatic drive ensuring that there is no damage the surface of the plate cylinder comes; this dimensioning of the stroke also compensates for any scraper wear that may occur.
  • the space requirement of the device is so small that it can be accommodated on the dampening unit side without difficulty.
  • the pneumatic cylinders - individually or several at the same time - can be controlled without delay from the control panel of the offset printing press and are held on a bar which extends over the entire length of the plate cylinder and runs parallel to the cylinder axis, with their piston rods all having the same stroke length .
  • the cleaning device is thus actuated from the same point from which the ink zone screws are remotely controlled in order to adjust the ink layer thickness.
  • the wipers consist of a rear base part and a front pressure lip, both of which have approximately a cuboid shape, the base part being substantially thicker and wider than the pressure lip which projects over both sides of the base part; the base part should have about three times the thickness and width of the pressure lip.
  • the insertion opening for the piston rod is made in the center of the base part from the rear thereof.
  • the comparatively weak dimensioning of the pressure lip and its lateral protrusion compared to the base part on each side is preferably about 5 mm, facilitates the elastic deformation in the course of pressing the scraper on the plate cylinder.
  • the length of each base part is equal to the width of the corresponding color zone appearing on the control panel of the offset printing press.
  • Fig. 1 shows five pneumatic cylinders 1a - 1e, which are a rectangular in cross-section and longitudinal section 2a - 2e with the dimensions 48 ⁇ 12 ⁇ 5 mm like a piston rod 3, of which only the piston rods 3a and 3c are visible.
  • the piston rods 3 are fork-shaped; at their free end, the two fork arms are bridged by a web 4. Compressed air supplies are indicated with 5a - 5e.
  • the pneumatic cylinders 1a - 1e are screwed onto a continuous bar 6.
  • the cylinders 1a-1e are provided with a rear tab 7a-7e with bores 8a-8e and a front housing bore 9a-9e; the fastening screw inserted into the housing bore 9a - 9e runs between the two fork arms of the piston rod 3.
  • Scraper 10a - 10e made of elastic material are pushed onto the free end of the piston rods 3 and consist of a rear base part 11a - 11e and a front pressure lip 12a - 12e.
  • the base part 11a-11e is much thicker and wider than the pressure lip 12a-12e and has an insertion opening 13 for the piston rod 3.
  • the base part 11a - 11e arcuate into the pressure lip 12a - 12e, each of which has lateral protrusions 12a1, 12a2, ..., 12e2.
  • the wipers 10a - 10e are arranged with respect to one another in such a way that, in the first, third and fifth wipers 10a, 10c, 10e, the pressure lip 12a, 12c, 12e below, in the second and fourth wipers 10b, 10d, however, the pressure lip 12b, 12d is arranged at the top, so that the adjacent lateral projections (eg 12a2 and 12b1) overlap each other.
  • a closed front covering the entire length of the plate cylinder 14 is the wiper fer 10a - 10e formed, of which the strippers 10b, 10d, 10e are shown in the retracted position and the stripper 10a in the extended position, in which it is pressed against the surface of the plate cylinder 14.
  • the scraper 10c is shown in a position slightly further extended than the scraper 10a.
  • the scraper 10c cannot normally assume this position; it is only intended to illustrate the maximum stroke length, which is approximately 10 mm given the dimensions of the pneumatic cylinders 1a-1e given above. Since the maximum stroke length is somewhat greater than the distance between the front edge of the wipers 10a - 10e and the parallel surface of the plate cylinder 14, when the pneumatic cylinders 1a - 1e are acted upon, the wipers 10a 10e are always firmly and elastically pressed against the surface of the plate cylinder 14 and a compensation of any wear of the pressure lips 12a 12e guaranteed.

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  • Inking, Control Or Cleaning Of Printing Machines (AREA)

Abstract

The device extends over the full length of the plate cylinder and touches the latter in the region between the ink transfer to the rubber cylinder and application of the damping solution. By means of this device, safe, rapid and complete cleaning of the plate cylinder with the minimum of spoil is to be made available to the operator. In accordance with the invention, this is achieved by providing that over the full length of the plate cylinder a plurality of pneumatic cylinders (la - le) are arranged in distributed fashion, the piston rods (3) of which are secured against rotation and at their free end carry a wiper (10a - IOe) made of elastic material, each two adjacent wipers being offset relative to one another and overlapping laterally and the stroke of each piston rod being somewhat longer than the distance between the leading edge of the withdrawn wipers and the surface of the plate cylinder. …<IMAGE>…

Description

Die Erfindung betrifft eine Einrichtung zum Entfer­nen von Schmutzteilchen vom Plattenzylinder einer Offsetdruckmaschine, die sich über die gesamte Länge des Plattenzylinders erstreckt und an diesem in dem zwischen der Farbübergabe an den Gummizylinder und dem Feuchtauftrag befindlichen Bereich angreift.The invention relates to a device for removing dirt particles from the plate cylinder of an offset printing machine, which extends over the entire length of the plate cylinder and engages it in the area between the ink transfer to the blanket cylinder and the dampening application.

Beim Offsetdruck kommt es immer wieder zu Verun­reinigungen des Plattenzylinders. Diese Verunreini­gungen können Papier- oder Pappfasern des zu bedruk­kenden Materials, aus der Druckfarbe stammende Zu­sammenballungen bzw. Klumpen oder Luftstaub sein; sie lassen auf der zu bedruckenden Fläche unbedruck­te bzw. farbfreie Stellen entstehen. Zur Behebung dieser Fehler wird entweder die Druckmaschine ange­halten und das Schmutzteilchen von Hand beseitigt oder bei laufender Druckmaschine ein Werkzeug gegen den rotierenden Plattenzylinder angedrückt, welches das Schmutzteilchen entfernt. Während das Anhalten der Druckmaschine zu einem Absinken der Drucklei­stung und einer Erhöhung des Ausschußanteils führt, da bei jedem Anfahren der Druckmaschine zwangsläufig Ausschuß anfällt, ist das - an sich verbotene - Hin­eingreifen in die laufende Druckmaschine für die Be­dienungsperson sehr gefährlich und bewirkt zudem, da es nur von der Farbauftragsseite her möglich ist, eine unerwünschte partielle Wegnahme von Farbe.In offset printing, the plate cylinder is always contaminated. These contaminants can be paper or cardboard fibers of the material to be printed, agglomerations or lumps originating from the printing ink, or air dust; they leave unprinted or color-free areas on the surface to be printed. To correct these errors, either the printing machine is stopped and the dirt particles are removed by hand, or a tool is pressed against the rotating plate cylinder while the printing machine is running, which removes the dirt particles. While stopping the printing machine leads to a decrease in the printing capacity and an increase in the reject percentage, since rejects are inevitable each time the printing machine is started, reaching into the running printing machine, which is forbidden in itself, is very dangerous for the operator and also causes, since it an undesirable partial removal of color is only possible from the color application side.

Es hat daher nicht an Versuchen gefehlt, ein Entfer­nen von Verunreinigungen des Plattenzylinders von Offsetdruckmaschinen zu ermöglichen, das frei von diesen Mängeln ist. In diesem Zusammenhang sind Lö­sungen bekannt geworden, wie sie bsp. in den DE-OS 25 22 743, 27 15 445, 28 50 448 und 34 10 376 sowie 36 20 156 beschrieben sind. Die vier zuerst genann­ ten Veröffentlichungen haben Vorrichtungen zum Ge­genstand, bei denen gegenüber dem farbfreien Bereich des Plattenzylinders eine sich parallel zu dessen Drehachse und über dessen gesamte Länge erstreckende Führung vorgesehen ist, auf der ein angetriebenes Reinigungswerkzeug verschiebbar gehalten ist. Diese bekannten Vorrichtungen haben jedoch keinen Eingang in die Praxis gefunden. Ursächlich dafür ist zum einen, daß der Raumbedarf von Führung, Reinigungs­werkzeug und Antrieb so groß ist, daß die Vorrich­tung sich in dem räumlich sehr beengten Bereich des Feuchtwerks kaum unterbringen läßt; zum andern hat es sich als nachteilig erwiesen, daß das Reinigungs­werkzeug jeweils erst einjustiert werden muß, was wegen des mitunter nur gegebenen Punktkontakts zwi­schen Werkzeug und Zylinder sehr hohe Genauigkeit erfordert, und daß an mehreren Stellen vorhandene Schmutzteilchen nur nacheinander beseitigt werden können, was beides langwierig ist und deshalb einen hohen Ausschußanteil zur Folge hat. Die zuletzt ge­nannte Veröffentlichung zeigt zwar eine Vorrichtung, bei der ein sich über die gesamte Länge des Platten­zylinders erstreckendes Reinigungswerkzeug in Ge­stalt einer Auftragswalze des Feuchtwerks vorhanden ist, doch hat auch diese bekannte Vorrichtung nicht den erhofften Erfolg gebracht. Zum einen ist der me­chanische Aufwand, der das Umfunktionieren der Auf­tragswalze zum Reinigungswerkzeug möglich macht, recht hoch; zum andern ist der Reinigungserfolg keineswegs sicher, da bei nicht ganz exakter Achs­parallelität von Plattenzylinder und Auftragswalze ein Entfernen von Schmutzteilchen über die gesamte Zylinderlänge nicht mehr gewährleistet ist. Dazu trägt auch der verhältnismäßig geringe Andruck der Auftragswalze an den Plattenzylinder bei, was dazu führen kann, daß das Schmutzteilchen nur plattge­quetscht und nicht entfernt wird.There has been no shortage of attempts to make it possible to remove contaminations from the plate cylinder of offset printing presses which is free from these defects. In this context, solutions have become known, such as. in DE-OS 25 22 743, 27 15 445, 28 50 448 and 34 10 376 and 36 20 156 are described. The four named first The subject of publications is devices in which, relative to the color-free region of the plate cylinder, a guide is provided which extends parallel to its axis of rotation and over its entire length and on which a driven cleaning tool is held displaceably. However, these known devices have not found their way into practice. The reason for this is, on the one hand, that the space required for the guide, cleaning tool and drive is so large that the device can scarcely be accommodated in the very confined area of the dampening unit; on the other hand, it has proven to be disadvantageous that the cleaning tool has to be adjusted in each case, which requires very high accuracy because of the occasional only point contact between tool and cylinder, and that dirt particles present in several places can only be removed one after the other, both of which are tedious is and therefore results in a high proportion of rejects. Although the last-mentioned publication shows a device in which there is a cleaning tool extending over the entire length of the plate cylinder in the form of an application roller of the dampening unit, this known device has also not achieved the hoped-for success. On the one hand, the mechanical effort that makes it possible to convert the applicator roller into a cleaning tool is quite high; on the other hand, the cleaning success is by no means certain, since if the plate cylinder and applicator roller are not exactly parallel, removal of dirt particles over the entire cylinder length is no longer guaranteed. The relatively low pressure of the application roller on the plate cylinder also contributes to this, which can lead to the fact that the dirt particle is only squeezed flat and not removed.

Durch die Erfindung soll eine Reinigungseinrichtung geschaffen werden, der diese Mängel der bekannten Vorrichtungen nicht anhaften, die also bei laufender Offsetdruckmaschine eine für die Bedienungsperson gefahrlose, rasch und vollständig erfolgende Reini­gung des Plattenzylinders bei minimalem Ausschußan­teil erlaubt. Ausgehend von der eingangs beschrie­benen bekannten Einrichtung wird diese Aufgabe er­findungsgemäß dadurch gelöst, daß über die gesamte Länge des Plattenzylinders mehrere Pneumatikzylinder verteilt angeordnet sind, deren verdrehgesicherte Kolbenstangen an ihrem freien Ende einen Abstreifer aus elastischem Werkstoff aufweisen, wobei je zwei benachbarte Abstreifer zueinander versetzt und seit­lich überlappend angeordnet sind und der Hubweg je­der Kolbenstange etwas länger als der Abstand zwi­schen der Vorderkante der eingefahrenen Abstreifer und der Oberfläche des Plattenzylinders ist.The invention is intended to provide a cleaning device which does not adhere to these deficiencies of the known devices, and which thus allows the plate cylinder to be cleaned safely and quickly and completely while the offset printing press is running, with a minimal proportion of rejects. Starting from the known device described above, this object is achieved according to the invention in that a plurality of pneumatic cylinders are arranged distributed over the entire length of the plate cylinder, the non-rotatable piston rods of which have a stripper made of elastic material at their free end, two adjacent strippers being offset from one another and laterally are arranged overlapping and the stroke of each piston rod is slightly longer than the distance between the front edge of the retracted wipers and the surface of the plate cylinder.

Bei dieser Ausgestaltung bilden die Abstreifer eine geschlossene, die gesamte Länge des Plattenzylinders überdeckende Front, die bei laufender Offsetdruckma­schine abschnittsweise gegen dessen Oberfläche zur Anlage gebracht werden kann. Dabei genügt es dann, wenn nur ein einziges Schmutzteilchen vorhanden ist, den betreffenden Abschnitt auszufahren, sind jedoch mehrere, über die Länge des Plattenzylinders ver­teilt angeordnete Schmutzteilchen vorhanden, lassen diese sich durch gleichzeitiges Ausfahren mehrerer Abschnitte in einem Zug entfernen. Die versetzte und seitlich überlappende Anordnung der Abstreifer ver­meidet die Entstehung einer toten Zone zwischen be­nachbarten Abstreifern. Die Bemessung des Hubwegs stellt eine jederzeit feste Anpressung des ausge­fahrenen Abstreifers an den Plattenzylinder sicher, wobei die Elastizität des Abstreiferwerkstoffs in Verbindung mit der Nachgiebigkeit des pneumatischen Antriebs gewährleistet, daß es zu keiner Beschädi­ gung der Oberfläche des Plattenzylinders kommt; außerdem bewirkt diese Bemessung des Hubwegs einen Ausgleich etwa stattfindender Abstreiferabnutzung. Schließlich ist bei Verwendung der heute am Markt erhältlichen kleinformatigen Pneumatikzylinder der Raumbedarf der Einrichtung derart gering, daß diese sich ohne Schwierigkeit auf der Seite des Feucht­werks unterbringen läßt.In this embodiment, the wipers form a closed front which covers the entire length of the plate cylinder and which can be brought against the surface thereof in sections while the offset printing machine is running. It is then sufficient if only a single dirt particle is present to extend the relevant section, but if there are several dirt particles distributed over the length of the plate cylinder, these can be removed by simultaneously extending several sections in one go. The offset and laterally overlapping arrangement of the wipers prevents the formation of a dead zone between adjacent wipers. The dimensioning of the stroke path ensures that the extended scraper is firmly pressed against the plate cylinder at all times, the elasticity of the scraper material in conjunction with the flexibility of the pneumatic drive ensuring that there is no damage the surface of the plate cylinder comes; this dimensioning of the stroke also compensates for any scraper wear that may occur. Finally, when using the small-format pneumatic cylinders available on the market today, the space requirement of the device is so small that it can be accommodated on the dampening unit side without difficulty.

In weiterer vorteilhafter Ausgestaltung der Erfin­dung sind die Pneumatikzylinder - einzeln oder mehrere gleichzeitig - vom Bedienungspult der Off­setdruckmaschine aus verzögerungsfrei steuerbar und auf einer sich über die gesamte Länge des Plattenzy­linders erstreckenden Leiste gehalten, die parallel zur Zylinderachse verläuft, wobei ihre Kolbenstangen alle die gleiche Hubweglänge aufweisen. Die Betäti­gung der Reinigungseinrichtung erfolgt also von der­selben Stelle, von der aus die Farbzonenschrauben zwecks Einstellung der Farbschichtdicke ferngesteu­ert werden. Die Anbringung aller Pneumatikzylinder auf einer einzigen Leiste ermöglicht eine sehr weit­gehende Vormontage der Reinigungseinrichtung und vereinfacht deren Ein- und Ausbau.In a further advantageous embodiment of the invention, the pneumatic cylinders - individually or several at the same time - can be controlled without delay from the control panel of the offset printing press and are held on a bar which extends over the entire length of the plate cylinder and runs parallel to the cylinder axis, with their piston rods all having the same stroke length . The cleaning device is thus actuated from the same point from which the ink zone screws are remotely controlled in order to adjust the ink layer thickness. The attachment of all pneumatic cylinders on a single bar enables a very extensive pre-assembly of the cleaning device and simplifies its installation and removal.

Es hat sich als besonders zweckmäßig erwiesen, wenn die Abstreifer aus einem hinteren Basisteil und einer vorderen Anpreßlippe bestehen, die beide etwa Quaderform besitzen, wobei das Basisteil wesentlich dicker und breiter als die Anpreßlippe ist, die über beide Seiten des Basisteils vorsteht; dabei sollte das Basisteil etwa die dreifache Dicke und Breite der Anpreßlippe aufweisen. Das schafft die Voraus­setzung dafür, daß gemäß einem weiteren Merkmal der Erfindung in das Basisteil von dessen Rückseite her mittig die Einstecköffnung für die Kolbenstange ein­gebracht ist. Die vergleichsweise schwache Dimensio­nierung der Anpreßlippe, deren seitlicher Überstand gegenüber dem Basisteil auf jeder Seite vorzugsweise etwa 5 mm beträgt, erleichtert die elastische Ver­formung im Zuge der Anpressung des Abstreifers an den Plattenzylinder.It has proven to be particularly expedient if the wipers consist of a rear base part and a front pressure lip, both of which have approximately a cuboid shape, the base part being substantially thicker and wider than the pressure lip which projects over both sides of the base part; the base part should have about three times the thickness and width of the pressure lip. This creates the prerequisite for the fact that, according to a further feature of the invention, the insertion opening for the piston rod is made in the center of the base part from the rear thereof. The comparatively weak dimensioning of the pressure lip and its lateral protrusion compared to the base part on each side is preferably about 5 mm, facilitates the elastic deformation in the course of pressing the scraper on the plate cylinder.

Gemäß einem besonders vorteilhaften Merkmal der Er­findung ist die Länge jedes Basisteils gleich der Breite der entsprechenden, am Bedienungspult der Offsetdruckmaschine erscheinenden Farbzone. Diese Abstimmung erleichtert die Bedienung der Reinigungs­einrichtung ganz wesentlich, da sie langwierige Er­mittlungen darüber, welcher Abstreifer zur Beseiti­gung eines festgestellten Schmutzteilchens einge­setzt werden muß, entbehrlich macht bzw. eine Bedie­nung "auf einen Blick" ermöglicht.According to a particularly advantageous feature of the invention, the length of each base part is equal to the width of the corresponding color zone appearing on the control panel of the offset printing press. This coordination considerably simplifies the operation of the cleaning device, since it makes lengthy investigations about which scraper has to be used to remove a dirt particle to be dispensed with or enables operation "at a glance".

Um zu vermeiden, daß bereits entfernte Schmutzteil­chen an den Abstreifern haftenbleiben und bei deren erneutem Anpressen an den Plattenzylinder wieder an dessen Oberfläche abgegeben werden, empfiehlt es sich, in den Rückholweg des Abstreifers einen gegen dessen Unterseite anpreßbaren Schaber einzuschalten.In order to prevent dirt particles that have already been removed from sticking to the wipers and being released to the surface of the plate cylinder when they are pressed again, it is advisable to switch on a wiper that can be pressed against the underside of the wiper in the return path.

In der Zeichnung ist ein bevorzugtes Ausführungsbei­spiel der erfindungsgemäßen Reinigungseinrichtung dargestellt.In the drawing, a preferred embodiment of the cleaning device according to the invention is shown.

Es zeigen

  • Fig. 1 eine Draufsicht,
  • Fig. 2 eine Vorderansicht und
  • Fig. 3 eine Seitenansicht der Reinigungseinrichtung.
Show it
  • 1 is a plan view,
  • Fig. 2 is a front view and
  • Fig. 3 is a side view of the cleaning device.

Fig. 1 läßt fünf Pneumatikzylinder 1a - 1e erkennen, die ein im Quer- und Längsschnitt rechteckiges Ge­häuse 2a - 2e mit den Abmessungen 48 × 12 × 5 mm so­ wie eine Kolbenstange 3 aufweisen, von denen ledig­lich die Kolbenstangen 3a und 3c sichtbar sind. Die Kolbenstangen 3 sind gabelartig ausgebildet; an ihrem freien Ende sind die beiden Gabelarme durch einen Steg 4 überbrückt. Mit 5a - 5e sind Druckluft­zuführungen angedeutet.Fig. 1 shows five pneumatic cylinders 1a - 1e, which are a rectangular in cross-section and longitudinal section 2a - 2e with the dimensions 48 × 12 × 5 mm like a piston rod 3, of which only the piston rods 3a and 3c are visible. The piston rods 3 are fork-shaped; at their free end, the two fork arms are bridged by a web 4. Compressed air supplies are indicated with 5a - 5e.

Die Pneumatikzylinder 1a - 1e sind auf einer durch­gehenden Leiste 6 verschraubt. Zu diesem Zweck sind die Zylinder 1a - 1e mit einer hinteren Lasche 7a - ­7e mit Bohrungen 8a - 8e und einer vorderen Gehäuse­bohrung 9a - 9e versehen; die in die Gehäusebohrung 9a - 9e eingeführte Befestigungsschraube verläuft zwischen den beiden Gabelarmen der Kolbenstange 3 hindurch.The pneumatic cylinders 1a - 1e are screwed onto a continuous bar 6. For this purpose, the cylinders 1a-1e are provided with a rear tab 7a-7e with bores 8a-8e and a front housing bore 9a-9e; the fastening screw inserted into the housing bore 9a - 9e runs between the two fork arms of the piston rod 3.

Auf das freie Ende der Kolbenstangen 3 sind Abstrei­fer 10a - 10e aus elastischem Werkstoff aufgescho­ben, die aus einem hinteren Basisteil 11a - 11e und einer vorderen Anpreßlippe 12a - 12e bestehen. Das Basisteil 11a - 11e ist wesentlich dicker und brei­ter als die Anpreßlippe 12a - 12e und weist eine Einstecköffnung 13 für die Kolbenstange 3 auf. Wie vor allem Fig. 3 erkennen läßt, geht das Basisteil 11a - 11e bogenförmig in die Anpreßlippe 12a - 12e über, deren jede seitliche Überstände 12a₁, 12a₂, ..., 12e₂ besitzt.Scraper 10a - 10e made of elastic material are pushed onto the free end of the piston rods 3 and consist of a rear base part 11a - 11e and a front pressure lip 12a - 12e. The base part 11a-11e is much thicker and wider than the pressure lip 12a-12e and has an insertion opening 13 for the piston rod 3. As can be seen above all Fig. 3, the base part 11a - 11e arcuate into the pressure lip 12a - 12e, each of which has lateral protrusions 12a₁, 12a₂, ..., 12e₂.

Aus den Fig. 1 und 2 ist ersichtlich, daß die Ab­streifer 10a - 10e inbezug aufeinander so angeordnet sind, daß abwechselnd beim ersten, dritten und fünf­ten Abstreifer 10a, 10c, 10e die Anpreßlippe 12a, 12c, 12e unten, beim zweiten und vierten Abstreifer 10b, 10d dagegen die Anpreßlippe 12b, 12d oben ange­ordnet ist, so daß die benachbarten seitlichen Uber­stände (z.B. 12a₂ und 12b₁) einander überlappen. Da­durch ist eine die gesamte Länge des Plattenzylin­ders 14 überdeckende geschlossene Front der Abstrei­ fer 10a - 10e gebildet, von denen die Abstreifer 10b, 10d, 10e in der eingefahrenen und der Abstrei­fer 10a in der ausgefahrenen Stellung gezeigt sind bzw. ist, in der er gegen die Oberfläche des Plat­tenzylinders 14 angepreßt ist.1 and 2 it can be seen that the wipers 10a - 10e are arranged with respect to one another in such a way that, in the first, third and fifth wipers 10a, 10c, 10e, the pressure lip 12a, 12c, 12e below, in the second and fourth wipers 10b, 10d, however, the pressure lip 12b, 12d is arranged at the top, so that the adjacent lateral projections (eg 12a₂ and 12b₁) overlap each other. As a result, a closed front covering the entire length of the plate cylinder 14 is the wiper fer 10a - 10e formed, of which the strippers 10b, 10d, 10e are shown in the retracted position and the stripper 10a in the extended position, in which it is pressed against the surface of the plate cylinder 14.

Der Abstreifer 10c ist in einer gegenüber dem Ab­streifer 10a geringfügig weiter ausgefahrenen Stel­lung gezeigt. Diese Stellung kann der Abstreifer 10c normalerweise nicht einnehmen; sie soll lediglich die maximale Hubweglänge veranschaulichen, die bei den weiter oben angegebenen Abmessungen der Pneuma­tikzylinder 1a - 1e etwa 10 mm beträgt. Da also die maximale Hubweglänge etwas größer als der Abstand zwischen der Vorderkante der Abstreifer 10a - 10e und der dazu parallelen Oberfläche des Plattenzylin­ders 14 ist, ist bei Beaufschlagung der Pneumatikzy­linder 1a - 1e stets ein festes elastisches Anpres­sen der Abstreifer 10a 10e gegen die Oberfläche des Plattenzylinders 14 sowie ein Ausgleich etwaiger Abnutzungen der Anpreßlippen 12a 12e gewährlei­stet.The scraper 10c is shown in a position slightly further extended than the scraper 10a. The scraper 10c cannot normally assume this position; it is only intended to illustrate the maximum stroke length, which is approximately 10 mm given the dimensions of the pneumatic cylinders 1a-1e given above. Since the maximum stroke length is somewhat greater than the distance between the front edge of the wipers 10a - 10e and the parallel surface of the plate cylinder 14, when the pneumatic cylinders 1a - 1e are acted upon, the wipers 10a 10e are always firmly and elastically pressed against the surface of the plate cylinder 14 and a compensation of any wear of the pressure lips 12a 12e guaranteed.

Claims (9)

1. Einrichtung zum Entfernen von Schmutzteilchen vom Plattenzylinder einer Offsetdruckmaschine, die sich über die gesamte Länge des Plattenzylinders erstreckt und an diesem in dem zwischen der Farb­übergabe an den Gummizylinder und dem Feuchtauf­trag befindlichen Bereich angreift, dadurch ge­kennzeichnet, daß über die gesamte Länge des Plattenzylinders (14) mehrere Pneumatikzylinder (1a - 1e) verteilt angeordnet sind, deren ver­drehgesicherte Kolbenstangen (3) an ihrem freien Ende einen Abstreifer (10a - 10e) aus elastischem Werkstoff aufweisen, wobei je zwei benachbarte Abstreifer (z B. 10a, 10b) zueinander versetzt und seitlich überlappend angeordnet sind und der Hubweg jeder Kolbenstange (3) etwas länger als der Abstand zwischen der Vorderkante der einge­fahrenen Abstreifer (10a - 10e) und der Oberflä­che des Plattenzylinders (14) ist.1. Device for removing dirt particles from the plate cylinder of an offset printing machine, which extends over the entire length of the plate cylinder and attacks this in the area between the ink transfer to the rubber cylinder and the dampening application, characterized in that over the entire length of the plate cylinder ( 14) a plurality of pneumatic cylinders (1a - 1e) are distributed, the non-rotating piston rods (3) of which have a wiper (10a - 10e) made of elastic material at their free end, with two adjacent wipers (e.g. 10a, 10b) offset from each other and are laterally overlapping and the stroke of each piston rod (3) is slightly longer than the distance between the front edge of the retracted wipers (10a - 10e) and the surface of the plate cylinder (14). 2. Einrichtung nach Anspruch 1, dadurch gekennzeich­net, daß die Pneumatikzylinder (1a - 1e) - ­einzeln oder mehrere gleichzeitig - vom Bedie­nungspult der Offsetdruckmaschine aus verzöge­rungsfrei steuerbar sind.2. Device according to claim 1, characterized in that the pneumatic cylinders (1a - 1e) - individually or several at the same time - can be controlled without delay from the control panel of the offset printing press. 3. Einrichtung nach den Ansprüchen 1 und 2, dadurch gekennzeichnet, daß die Pneumatikzylinder (1a - ­1e) auf einer sich über die gesamte Länge des Plattenzylinders (14) erstreckenden Leiste (6) gehalten sind, die parallel zur Zylinderlängsach­se verläuft, und ihre Kolbenstangen (3) alle die gleiche Hubweglänge aufweisen.3. Device according to claims 1 and 2, characterized in that the pneumatic cylinders (1a - 1e) are held on a bar (6) extending over the entire length of the plate cylinder (14), which extends parallel to the longitudinal axis of the cylinder, and their piston rods (3) all have the same stroke length. 4. Einrichtung nach den Ansprüchen 1 - 3, dadurch gekennzeichnet, daß die Abstreifer (10a - 10e) aus einem hinteren Basisteil (11a - 11e) und einer vorderen Anpreßlippe (12a - 12e) bestehen, die beide etwa Quaderform besitzen, wobei das Ba­sisteil (11a - 11e) wesentlich dicker und breiter als die Anpreßlippe (12a - 12e) ist, die über beide Seiten des Basisteils (11a - 11e) vorsteht.4. Device according to claims 1-3, characterized in that the wipers (10a - 10e) from a rear base part (11a - 11e) and a front pressure lip (12a - 12e), both of which are approximately cuboid in shape, the base part (11a - 11e) being substantially thicker and wider than the pressure lip (12a - 12e), which projects over both sides of the base part (11a - 11e) . 5. Einrichtung nach Anspruch 4, dadurch gekennzeich­net, daß das Basisteil (11a - 11e) etwa die drei­fache Dicke und Breite der Anpreßlippe (12a - 12e) aufweist.5. Device according to claim 4, characterized in that the base part (11a - 11e) has approximately three times the thickness and width of the pressure lip (12a - 12e). 6. Einrichtung nach den Ansprüchen 4 und 5, dadurch gekennzeichnet, daß in das Basisteil (11a - 11e) von dessen Rückseite her mittig die Einstecköff­nung (13) für die Kolbenstange (z.B. 3a) einge­bracht ist.6. Device according to claims 4 and 5, characterized in that in the base part (11a - 11e) from the back of the center of the insertion opening (13) for the piston rod (for example 3a) is introduced. 7. Einrichtung nach den Ansprüchen 4 - 6, dadurch ge­kennzeichnet, daß der seitliche Überstand (12a₁, 12a₂, ..., 12e₂) der Anpreßlippen (12a - 12e) ge­genüber deren Basisteil (11a - 11e) auf jeder Sei­te etwa 5 mm beträgt.7. Device according to claims 4-6, characterized in that the lateral projection (12a₁, 12a₂, ..., 12e₂) of the pressure lips (12a - 12e) relative to the base part (11a - 11e) on each side is about 5 mm . 8. Einrichtung nach den Ansprüchen 4 - 7, dadurch ge­kennzeichnet, daß die Länge jedes Basisteils (11a - ­11e) etwa gleich der Breite der entsprechenden, am Bedienungspult der Offsetdruckmaschine erschei­nenden Farbzone ist.8. Device according to claims 4-7, characterized in that the length of each base part (11a - 11e) is approximately equal to the width of the corresponding color zone appearing on the control panel of the offset printing press. 9. Einrichtung nach Anspruch 1 und mindestens einem der folgenden, dadurch gekennzeichnet, daß in den Rückholweg des Abstreifers (10a - 10e) ein gegen dessen Unterseite anpreßbarer Schaber eingeschal­tet ist.9. Device according to claim 1 and at least one of the following, characterized in that in the return path of the scraper (10a - 10e) a scraper which can be pressed against its underside is switched on.
EP88104524A 1987-04-22 1988-03-22 Device for removing foreign particles from the platen cylinder of an offset-printing press Expired - Lifetime EP0287822B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873713433 DE3713433A1 (en) 1987-04-22 1987-04-22 DEVICE FOR REMOVING DIRTY PARTICLES FROM THE PLATE CYLINDER OF AN OFFSET PRINTING MACHINE
DE3713433 1987-04-22

Publications (2)

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EP0287822A1 true EP0287822A1 (en) 1988-10-26
EP0287822B1 EP0287822B1 (en) 1991-10-16

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EP88104524A Expired - Lifetime EP0287822B1 (en) 1987-04-22 1988-03-22 Device for removing foreign particles from the platen cylinder of an offset-printing press

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US (1) US4922820A (en)
EP (1) EP0287822B1 (en)
CA (1) CA1299015C (en)
DE (1) DE3713433A1 (en)

Cited By (5)

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EP0351562A2 (en) * 1988-07-16 1990-01-24 Heidelberger Druckmaschinen Aktiengesellschaft Device for cleaning a plate cylinder and a transfer cylinder of an offset printing machine
EP0422593A1 (en) * 1989-10-09 1991-04-17 MAN Roland Druckmaschinen AG Device for removing foreign particles from the periphery of a plate cylinder in a printing machine
EP0545646A1 (en) * 1991-12-03 1993-06-09 Comtec Co., Ltd. Cleaning device for offset printing machine
US6316595B1 (en) 1994-03-14 2001-11-13 Aventis Pharma Deutschland Gmbh PNA synthesis using a base-labile amino protecting group
CH700101A1 (en) * 2008-12-12 2010-06-15 Alfred Simonetti Measuring scraper for measuring scraper-contact pressure in rotating or idle roller of paper machine, has blade segments arranged side-by-side, where end region of each blade segment is connected with extension guide rails

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US5138945A (en) * 1991-08-13 1992-08-18 Man Roland Druckmaschinen Ag System for removing foreign matter from a plate cylinder of a printing press
US5603263A (en) * 1995-09-08 1997-02-18 Heidelberger Druckmaschinen Ag Scraper blade and ink scavenger for printing presses
AU6567498A (en) * 1997-03-18 1998-10-12 Machine Design Services, Inc. Cleaning system for blanket cylinders
US6691617B2 (en) * 2001-03-27 2004-02-17 Heidelberger Druckmaschinen Ag Apparatus for selectively cleaning a printing press cylinder
US8746142B2 (en) * 2012-06-27 2014-06-10 Illinois Tool Works Inc. Stencil wiper spot cleaner assembly and related method

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0351562A2 (en) * 1988-07-16 1990-01-24 Heidelberger Druckmaschinen Aktiengesellschaft Device for cleaning a plate cylinder and a transfer cylinder of an offset printing machine
EP0351562B1 (en) * 1988-07-16 1993-09-15 Heidelberger Druckmaschinen Aktiengesellschaft Device for cleaning a plate cylinder and a transfer cylinder of an offset printing machine
EP0422593A1 (en) * 1989-10-09 1991-04-17 MAN Roland Druckmaschinen AG Device for removing foreign particles from the periphery of a plate cylinder in a printing machine
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EP0545646A1 (en) * 1991-12-03 1993-06-09 Comtec Co., Ltd. Cleaning device for offset printing machine
US5309836A (en) * 1991-12-03 1994-05-10 Comtec Co., Ltd. Cleaning device for offset printing machine
US6316595B1 (en) 1994-03-14 2001-11-13 Aventis Pharma Deutschland Gmbh PNA synthesis using a base-labile amino protecting group
CH700101A1 (en) * 2008-12-12 2010-06-15 Alfred Simonetti Measuring scraper for measuring scraper-contact pressure in rotating or idle roller of paper machine, has blade segments arranged side-by-side, where end region of each blade segment is connected with extension guide rails

Also Published As

Publication number Publication date
CA1299015C (en) 1992-04-21
US4922820A (en) 1990-05-08
DE3713433A1 (en) 1988-11-03
DE3713433C2 (en) 1992-01-09
EP0287822B1 (en) 1991-10-16

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