EP0581018B1 - Blanket with noise dampening means - Google Patents

Blanket with noise dampening means Download PDF

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Publication number
EP0581018B1
EP0581018B1 EP93110104A EP93110104A EP0581018B1 EP 0581018 B1 EP0581018 B1 EP 0581018B1 EP 93110104 A EP93110104 A EP 93110104A EP 93110104 A EP93110104 A EP 93110104A EP 0581018 B1 EP0581018 B1 EP 0581018B1
Authority
EP
European Patent Office
Prior art keywords
cylindrical body
blanket
blanket cylinder
sleeve
shaped rubber
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
EP93110104A
Other languages
German (de)
French (fr)
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EP0581018A1 (en
Inventor
James B. Vrotacoe
Charles D. Lyman
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.)
Heidelberger Druckmaschinen AG
Original Assignee
Heidelberger Druckmaschinen AG
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Filing date
Publication date
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Publication of EP0581018A1 publication Critical patent/EP0581018A1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/193—Transfer cylinders; Offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/02—Blanket structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N6/00—Mounting boards; Sleeves Make-ready devices, e.g. underlays, overlays; Attaching by chemical means, e.g. vulcanising

Definitions

  • the present invention relates to an offset printing unit, in particular a printing blanket for a blanket cylinder in the printing unit.
  • An offset printing unit has a number of rotatable cylinders, including a plate cylinder and a blanket cylinder.
  • the plate cylinder carries a printing plate, on the surface of which a colored print image is fixed.
  • the blanket cylinder carries a blanket. When the cylinder rotates, the plate on the plate cylinder transfers the ink image printed onto the blanket on the blanket cylinder in the gap between the plate cylinder and the blanket cylinder. The rubber blanket on the blanket cylinder then transfers the inked print image onto the material to be printed, such as a paper web.
  • a conventional blanket is in the form of a sheet or sheet and is applied to a blanket cylinder by being wound around it.
  • a printing rubber blanket can alternatively also be designed as a sleeve and attached to a rubber blanket cylinder by telescopic sliding.
  • Such a sleeve-like rubber blanket has a cylindrical body which supports the rubber blanket in its sleeve-like shape.
  • the cylindrical body and the blanket cylinder are designed so that the cylindrical body can be attached with a tight fit over the blanket cylinder.
  • the blanket cylinder is provided with air flow openings through which compressed air flows over the blanket cylinder.
  • the cylindrical body in the sleeve-shaped rubber blanket over the Air flow openings in the blanket cylinder it is diametrically expanded by the compressed air flow. In its stretched state, the cylindrical body can be pushed axially onto and from the blanket cylinder. When the compressed air is reduced, the cylindrical body contracts over the blanket cylinder and thus creates a tight fit on the blanket cylinder.
  • US 650,290 relates to a device for damping noise in the manufacture and processing of metal plates in container construction.
  • Resilient rings are pushed, for example, over tubular workpieces, the rings being coated on the inside with a layer of leather, rubber or another natural material.
  • a printing blanket for an offset printing unit has a sleeve-like shape and can be mounted telescopically over a blanket cylinder which is provided with air flow openings through which compressed air flows over the blanket cylinder.
  • the sleeve-shaped rubber blanket has a cylindrical pressure part with a cylindrical outer pressure surface.
  • the sleeve-shaped rubber blanket also has a cylindrical body which carries the cylindrical pressure part.
  • the cylindrical body can be in an original state and in a stretched state. In its original state, the cylindrical body has an inside diameter that is smaller than the diameter of the blanket cylinder. In its stretched state, it has an inside diameter that is larger than the diameter of the blanket cylinder.
  • the cylindrical body in the sleeve-shaped rubber blanket can be brought into its stretched state under the influence of a compressed air flow over the rubber blanket cylinder when it is placed telescopically over the air flow openings in the rubber blanket cylinder.
  • the sleeve-shaped rubber blanket further comprises a device for damping noise which is caused by the compressed air flow acting on the sleeve-shaped rubber blanket.
  • the noise damping device dampens the vibration of the cylindrical body of the sleeve-shaped rubber blanket caused by the acting compressed air flow.
  • the cylindrical body has an end piece which extends axially beyond the end of the blanket cylinder, and the noise damping device consists of a damping ring which extends circumferentially around the inside of the end piece of the body.
  • the damping ring is a thin strip of noise-absorbing material that permanently adheres to the inner surface of the cylindrical body.
  • a printing unit 10 constructed according to the present invention is shown schematically in FIG. 1.
  • the printing unit 10 as an example, is an offset printing unit for lithographic printing with a plate cylinder 12, a blanket cylinder 14 and a printing cylinder 15.
  • the plate cylinder 12, the Blanket cylinders 14 and impression cylinders 15 are rotatably supported with their respective ends in a pair of side frames 16, one of which is shown in FIG. 1.
  • the plate cylinder 12 carries a printing plate 18 on which an image to be printed is fixed.
  • the pressure plate 18 is made of thin metal and is attached to the plate cylinder 12 by winding it around the plate cylinder 12.
  • a clamping mechanism 19 in the plate cylinder 12 holds the printing plate 18 thereon.
  • the blanket cylinder 14 carries a blanket 20.
  • the blanket is designed as a sleeve which is attached to the blanket cylinder 14 by telescopic sliding.
  • the printing unit 10 also includes inking rollers 22, an ink fountain 24 and a motor 26.
  • the motor 26 drives a gear train (not shown) which is connected to the cylinders and rollers in the printing unit 10 and which are shown by the arrow in Fig. 1 indicated direction rotates.
  • the engine 26 and the gear train can be constructed in the manner known in the art.
  • the inking rollers 22 transfer ink from the ink fountain 24 to the printing plate 18 on the plate cylinder 12.
  • the printing plate 18 transfers the colored printing image the blanket 20 on the blanket cylinder 14.
  • the blanket transfers the inked print image to the material to be printed, which is preferably a web moving through the gap 32 between the blanket cylinder 14 and the impression cylinder 15.
  • the impression cylinder 15 is a second blanket cylinder with a second sleeve-shaped blanket 34 for simultaneous printing on the opposite side of the web 30.
  • the blanket 20 has a pressure member 40 and a supporting cylindrical body 42.
  • the pressure member 40 is elastic and has a cylindrical shape with a gapless cylindrical outer pressure surface 44.
  • the cylindrical body 42 is relatively rigid and has a gapless cylindrical inner surface 46 which extends circumferentially completely around the outer surface 48 of the blanket cylinder 14.
  • cylindrical body 42 is made of nickel.
  • the pressure member 40 of the blanket 20 is made of layers.
  • the pressure member 40 is composed of layers similar to those shown in U.S. Pat. Patent No. 3,700,541 -shrimpton et al - disclosed layers of a rubber blanket. Accordingly, the pressure member 40 has a compressible layer 50, a reinforcing layer 52 and a pressure layer 54.
  • the compressible layer 50 in the pressure part 40 of the rubber blanket 20 is fastened by gluing to the cylindrical rubber blanket body 42 and represents a body 62 made of rubber-like material.
  • the body 62 made of rubber-like material has evenly distributed microcells 64 which give the body 62 the compressibility.
  • the microcells are created by incorporating compressible, hollow microspheres 66 into the rubber-like material of the body 62.
  • the body 62 of the rubber-like material could also be produced by adding a material other than microspheres 66, e.g. B. can be made compressible by known from the US Patent No. 3,887,750 - Duckett et al - compressible pieces of thread.
  • the body 62 could be made compressible by known methods of creating voids, such as blowing and leaching, known from US Patent No. 4,025,685 to Haran et al.
  • the reinforcing layer 52 in the pressure part 40 of the rubber blanket 20 consists of a fabric 70 connected with a polymer mixture.
  • the pressure layer 54 consists of a body 72 made of rubber-like material and forms the outer pressure surface 44 of the rubber blanket 20. Unlike that in the Shrimpton et al
  • the printing layer shown in the patent is cylindrical, the printing layer 54 of this invention, and the outer printing surface 44 is a continuous, gapless cylindrical surface extending all the way around the blanket 20.
  • the printing plate 18 on the plate cylinder 12 moves against the blanket 20 on the blanket cylinder 14.
  • the rubber blanket is pressed in, where the pressure plate 18 presses against it in the cylinder gap 28.
  • the compressible layer 50 in the rubber blanket 20 is compressed below the pressed-in part of the printing layer 54 and the reinforcing layer 52.
  • the compressible layer 50 thus allows the pressure layer 54 and the reinforcing layer 52 to be displaced radially inwards, so that the pressure surface 44 on the pressure layer 54 on both sides of the cylinder gap 28 does not bulge radially outwards.
  • the rubber blanket 20 has a central axis 90.
  • the blanket cylinder 14 has a central axis 100 and a pair of journal shafts 102 on which it is supported and rotates about its central axis 100 in the printing unit 10.
  • the blanket cylinder 14 also has a chamfered edge surface 106 at an axial end of its jacket surface 48.
  • the jacket surface of the rubber blanket cylinder 14 has a diameter which is slightly larger than the inner diameter of the cylindrical body 42 of the rubber blanket 20.
  • the chamfered edge surface 106 of the rubber blanket cylinder 14 tilts radially inward from the lateral surface 48 and has a diameter at its radial inner end which is slightly smaller than the inner diameter of the cylindrical body 42.
  • the blanket cylinder 14 has a number of air flow openings 108 on its outer surface 48.
  • the air flow openings 108 are arranged circumferentially in a row at a small distance from the beveled edge surface 106 and are through a number of air openings 112 (FIGS. 2, 3) within the rubber blanket cylinder 14 connected to an air inlet 110.
  • the air inlet 110 is optionally connected to a compressed air source 114 by a compressed air line 116.
  • the rubber blanket can be telescopically pushed over the rubber blanket cylinder. Since the outer surface 48 of the blanket cylinder 14 has a diameter that is slightly larger than the inner diameter of the cylindrical body 42 in the blanket 20, the cylindrical body 42 is forced to expand diametrically when it is against the beveled edge surface 106 and axially moved to the outer surface 48. If the cylindrical body 42 is moved with its inner surface 46 axially via the air flow openings 108 on the outer surface 48 of the blanket cylinder 14, one of them Source 114 compressed air directed at the air flow openings 108. The compressed air flows radially out of the openings 108 and strikes the inner surface 46 of the cylindrical body 42 so that it expands diametrically.
  • the compressed air directed against the inner surface 46 of the cylindrical body 42 expands the cylindrical body 42 continuously while it is being moved axially over the outer surface 48 of the blanket cylinder 14.
  • the air pressure is switched off.
  • the cylindrical body 42 then contracts diametrically around the outer surface of the blanket cylinder 14 in an elastic manner.
  • the blanket 20 which has an original inner diameter that is smaller than the diameter of the outer surface 48 of the blanket cylinder 14, is installed with a tight fit on the blanket cylinder 14.
  • the blanket 20 is then removed from the blanket cylinder 14 by stretching the cylindrical body 42 again under the influence of compressed air and in this state the blanket 20 is axially pushed down from the blanket cylinder 14.
  • the nickel material of the cylindrical body 42 has the optimum elasticity for installing and removing the rubber blanket in the manner described above when subjected to a pressure from a conventional pneumatic source of 6.2 x 10 5 N / m 2 (6.2 bar) becomes.
  • the blanket 20 in the preferred embodiment has a noise damping member in the form of a vibration damping ring 120.
  • the damping ring 120 is mounted on the inner surface 46 of the cylindrical body 42 and dampens the vibration thereof , which is caused by the flow of compressed air between the outer surface 48 and the inner surface 46.
  • the damping ring 120 significantly reduces the level of noise that must be tolerated by personnel working with the printing unit 10.
  • the cylindrical body 42 has an end portion 122 that is outside the end of the blanket cylinder 14 when the blanket 20 is installed on the blanket cylinder 14, as shown in FIG. 5.
  • the damping ring 120 is fixed on the inner surface 46 on the outer edge 124 of the end part 122.
  • the damping ring 120 then makes it easier to handle the cylindrical body 42 at the edge 124.
  • the damping ring 120 is held in its position on the inner surface 46 of the cylindrical body 42 by the centrifugal force acting thereon, which arises when the rubber blanket 20 rotates with the rubber blanket cylinder 14.
  • the damping ring 120 could also be attached to the outer surface of the cylindrical body 42, as shown in broken lines in FIG.
  • damping ring 120 would then have to be attached more firmly to the cylindrical body 42.
  • damping rings or other noise damping elements can also be used as required, for which the material, the dimension and the location of the attachment must be selected accordingly. It could e.g. B. the other end of the blanket 20 may be formed as shown in Fig. 5, and one or a plurality of damping rings are attached to the outer surface of the respective end part of the cylindrical body 42.
  • the damping ring 120 preferably consists of a resilient strip of a resin-like and / or other damping material with a length that corresponds to the circumference of the inner surface 46 of the cylindrical body 42 and is permanently glued to the inner surface 46 with an adhesive.
  • the damping ring 120 is such a strip of noise damping material with an adhesive layer; this material is distributed by Sound Seal, a subsidiary of United Process, Inc., under the trademark "ANTIPHON LD-13".

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Printing Plates And Materials Therefor (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)

Description

Die vorliegende Erfindung betrifft ein Offsetdruckwerk, insbesondere ein Druckgummituch für einen Gummituchzylinder in dem Druckwerk.The present invention relates to an offset printing unit, in particular a printing blanket for a blanket cylinder in the printing unit.

Ein Offsetdruckwerk hat eine Anzahl rotierbarer Zylinder, einschließlich eines Plattenzylinders und eines Gummituchzylinders. Der Plattenzylinder trägt eine Druckplatte, auf deren Oberfläche ein eingefärbtes Druckbild festgelegt ist. Der Gummituchzylinder trägt ein Gummituch. Beim Rotieren der Zylinder überträgt die Platte auf dem Plattenzylinder das eingefärbte Druckbild auf das Gummituch auf dem Gummituchzylinder in dem Spalt zwischen dem Plattenzylinder und dem Gummituchzylinder. Das Gummituch auf dem Gummituchzylinder überträgt dann das eingefärbte Druckbild auf das zu bedruckende Material, wie eine Papierbahn.An offset printing unit has a number of rotatable cylinders, including a plate cylinder and a blanket cylinder. The plate cylinder carries a printing plate, on the surface of which a colored print image is fixed. The blanket cylinder carries a blanket. When the cylinder rotates, the plate on the plate cylinder transfers the ink image printed onto the blanket on the blanket cylinder in the gap between the plate cylinder and the blanket cylinder. The rubber blanket on the blanket cylinder then transfers the inked print image onto the material to be printed, such as a paper web.

Ein herkömmliches Druckgummituch hat die Form eines Bogens oder Blattes und wird auf einen Gummituchzylinder aufgebracht, indem es um diesen herumgewunden wird. Wie aus EP 0 421 145 A2 bekannt, kann ein Druckgummituch alternativ auch als eine Hülse ausgebildet sein und auf einen Gummituchzylinder durch teleskopisches überschieben angebracht werden. Solch ein hülsenartiges Gummituch hat einen zylindrischen Körper, der das Gummituch in seiner hülsenartigen Form stützt. Der zylindrische Körper und der Gummituchzylinder sind so ausgebildet, daß der zylindrische Körper mit einem Festsitz über dem Gummituchzylinder angebracht werden kann. Der Gummituchzylinder ist mit Luftdurchflußöffnungen versehen, durch welche Druckluft über den Gummituchzylinder strömt. Wenn der zylindrische Körper in dem hülsenförmigen Gummituch sich über den Luftdurchflußöffnungen in dem Gummituchzylinder befindet, so wird dieser durch den Druckluftstrom diametral gedehnt. Der zylindrische Körper kann in seinem gedehnten Zustand axial auf den Gummituchzylinder und von diesem heruntergeschoben werden. Wenn die Druckluft reduziert wird, zieht sich der zylindrische Körper über dem Gummituchzylinder zusammen und stellt so einen Festsitz auf dem Gummituchzylinder her.A conventional blanket is in the form of a sheet or sheet and is applied to a blanket cylinder by being wound around it. As is known from EP 0 421 145 A2, a printing rubber blanket can alternatively also be designed as a sleeve and attached to a rubber blanket cylinder by telescopic sliding. Such a sleeve-like rubber blanket has a cylindrical body which supports the rubber blanket in its sleeve-like shape. The cylindrical body and the blanket cylinder are designed so that the cylindrical body can be attached with a tight fit over the blanket cylinder. The blanket cylinder is provided with air flow openings through which compressed air flows over the blanket cylinder. If the cylindrical body in the sleeve-shaped rubber blanket over the Air flow openings in the blanket cylinder, it is diametrically expanded by the compressed air flow. In its stretched state, the cylindrical body can be pushed axially onto and from the blanket cylinder. When the compressed air is reduced, the cylindrical body contracts over the blanket cylinder and thus creates a tight fit on the blanket cylinder.

US 650,290 betrifft eine Einrichtung zum Dämpfen von Geräusch bei der Herstellung und Bearbeitung von Metallplatten im Behälterbau. Es werden federnde Ringe beispielsweise über rohrförmige Werkstücke geschoben, wobei die Ringe an ihrer Innenseite mit einer Schicht aus Leder, Gummi oder einem anderen natürlichen Material beschichtet sind.US 650,290 relates to a device for damping noise in the manufacture and processing of metal plates in container construction. Resilient rings are pushed, for example, over tubular workpieces, the rings being coated on the inside with a layer of leather, rubber or another natural material.

Nach der vorliegenden Erfindung hat ein Druckgummituch für ein Offsetdruckwerk eine hülsenartige Form und kann teleskopisch über einem Gummituchzylinder angebracht werden, der mit Luftdurchflußöffnungen versehen ist, durch welche Druckluft über den Gummituchzylinder strömt. Das hülsenförmige Gummituch hat ein zylindrisches Druckteil mit einer zylindrischen äußeren Druckfläche. Das hülsenförmige Gummituch hat auch einen zylindrischen Körper, der das zylindrische Druckteil trägt. Der zylindrische Körper kann in einem ursprünglichen Zustand und in einem gedehnten Zustand sein. In seinem ursprünglichen Zustand hat der zylindrische Körper einen Innendurchmesser, der kleiner ist als der Durchmesser des Gummituchzylinders. In seinem gedehnten Zustand hat er einen Innendurchmesser, der größer ist als der Durchmesser des Gummituchzylinders. Der zylindrische Körper in dem hülsenförmigen Gummituch kann unter dem Einfluß eines Druckluftstroms über den Gummituchzylinder hin in seinen gedehnten Zustand gebracht werden, wenn dieser teleskopisch über die Luftdurchflußöffnungen in dem Gummituchzylinder plaziert wird.According to the present invention, a printing blanket for an offset printing unit has a sleeve-like shape and can be mounted telescopically over a blanket cylinder which is provided with air flow openings through which compressed air flows over the blanket cylinder. The sleeve-shaped rubber blanket has a cylindrical pressure part with a cylindrical outer pressure surface. The sleeve-shaped rubber blanket also has a cylindrical body which carries the cylindrical pressure part. The cylindrical body can be in an original state and in a stretched state. In its original state, the cylindrical body has an inside diameter that is smaller than the diameter of the blanket cylinder. In its stretched state, it has an inside diameter that is larger than the diameter of the blanket cylinder. The cylindrical body in the sleeve-shaped rubber blanket can be brought into its stretched state under the influence of a compressed air flow over the rubber blanket cylinder when it is placed telescopically over the air flow openings in the rubber blanket cylinder.

Das hülsenförmige Gummituch umfaßt ferner eine Einrichtung zur Dämpfung von Lärm, der von dem auf das hülsenförmige Gummituch einwirkenden Druckluftstrom verursacht wird. Im besonderen dämpft die Lärmdämpfungseinrichtung das von dem einwirkenden Druckluftstrom verursachte Vibrieren des zylindrischen Körpers des hülsenförmigen Gummituchs.The sleeve-shaped rubber blanket further comprises a device for damping noise which is caused by the compressed air flow acting on the sleeve-shaped rubber blanket. In particular, the noise damping device dampens the vibration of the cylindrical body of the sleeve-shaped rubber blanket caused by the acting compressed air flow.

Diese Problemstellung wird erfindungsgemäß durch die Merkmale im Kennzeichnenden Teil der Ansprüche 1 und 7 gelöst.This problem is solved according to the invention by the features in the characterizing part of claims 1 and 7.

In einer bevorzugten Ausführung der Erfindung hat der zylindrische Körper ein Endstück, das sich axial über das Ende des Gummituchzylinders hinaus erstreckt, und die Lärmdämpfungseinrichtung besteht aus einem Dämpfungsring, der sich umfänglich um die Innenseite des Endstücks des Körpers erstreckt. Der Dämpfungsring ist ein dünner Streifen aus lärmdämpfendem Material, der permanent an der Innenfläche des zylindrischen Körpers haftet. Wenn der Druckluftstrom auf den zylindrischen Körper einwirkt, um diesen diametral zu dehnen, minimiert der Dämpfungsring das von dem Druckluftstrom verursachte Vibrieren des zylindrischen Körpers und reduziert somit den Lärmpegel, der von dem das Druckwerk bedienende Personal toleriert werden muß.In a preferred embodiment of the invention, the cylindrical body has an end piece which extends axially beyond the end of the blanket cylinder, and the noise damping device consists of a damping ring which extends circumferentially around the inside of the end piece of the body. The damping ring is a thin strip of noise-absorbing material that permanently adheres to the inner surface of the cylindrical body. When the flow of compressed air acts on the cylindrical body to expand it diametrically, the damping ring minimizes the vibration of the cylindrical body caused by the compressed air flow and thus reduces the level of noise that must be tolerated by personnel operating the printing unit.

Diese und andere Merkmale der Erfindung werden durch die folgende Beschreibung eines bevorzugten Ausführungsbeispiels im Zusammenhang mit den beigefügten, nachstehend erläuterten Zeichnungen weiter verdeutlicht.

Fig. 1
ist eine schematische Darstellung eines Druckwerks gemäß der vorliegenden Erfindung;
Fig. 2
ist eine Teilansicht von in Fig. 1 gezeigten Teilen;
Fig. 3
ist eine Teilansicht von in Fig. 1 gezeigten Teilen;
Fig. 4
ist eine schematische Darstellung von in Fig. 1 gezeigten Teilen; und
Fig. 5
ist eine Teilansicht von in Fig. 4 gezeigten Teilen.
These and other features of the invention are further illustrated by the following description of a preferred embodiment in conjunction with the accompanying drawings, which are explained below.
Fig. 1
is a schematic representation of a printing unit according to the present invention;
Fig. 2
Fig. 3 is a partial view of parts shown in Fig. 1;
Fig. 3
Fig. 3 is a partial view of parts shown in Fig. 1;
Fig. 4
Figure 3 is a schematic illustration of parts shown in Figure 1; and
Fig. 5
4 is a partial view of parts shown in FIG.

In Fig. 1 ist ein gemäß vorliegender Erfindung konstruiertes Druckwerk 10 schematisch dargestellt. Das Druckwerk 10, als Beispiel, ist ein Offsetdruckwerk für den Lithografiedruck mit einem Plattenzylinder 12, einem Gummituchzylinder 14 und einem Druckzylinder 15. Der Plattenzylinder 12, der Gummituchzylinder 14 und der Druckzylinder 15 sind mit ihren jeweiligen Enden rotierbar in einem Seitenrahmenpaar 16, wovon ein einzelner in Fig. 1 gezeigt ist, gelagert.A printing unit 10 constructed according to the present invention is shown schematically in FIG. 1. The printing unit 10, as an example, is an offset printing unit for lithographic printing with a plate cylinder 12, a blanket cylinder 14 and a printing cylinder 15. The plate cylinder 12, the Blanket cylinders 14 and impression cylinders 15 are rotatably supported with their respective ends in a pair of side frames 16, one of which is shown in FIG. 1.

Der Plattenzylinder 12 trägt eine Druckplatte 18, auf welcher ein zu druckendes Bild festgelegt ist. Die Druckplatte 18 besteht aus dünnem Metall und wird auf dem Plattenzylinder 12 angebracht, indem diese um den Plattenzylinder 12 gewunden wird. Ein Einspannmechanismus 19 in dem Plattenzylinder 12 hält die Druckplatte 18 auf diesem fest. Der Gummituchzylinder 14 trägt ein Gummituch 20. Das Gummituch ist als Hülse gestaltet, die auf dem Gummituchzylinder 14 durch teleskopisches überschieben angebracht wird.The plate cylinder 12 carries a printing plate 18 on which an image to be printed is fixed. The pressure plate 18 is made of thin metal and is attached to the plate cylinder 12 by winding it around the plate cylinder 12. A clamping mechanism 19 in the plate cylinder 12 holds the printing plate 18 thereon. The blanket cylinder 14 carries a blanket 20. The blanket is designed as a sleeve which is attached to the blanket cylinder 14 by telescopic sliding.

Das Druckwerk 10 umfaßt auch Farbauftragwalzen 22, einen Farbkasten 24 und einen Motor 26. Der Motor 26 treibt einen Getriebezug (nicht gezeigt) an, der mit den Zylindern und Walzen in dem Druckwerk 10 verbunden ist und diese in die durch den Pfeil in Fig. 1 angedeutete Richtung rotiert. Der Motor 26 und der Getriebezug können in der aus dem Stand der Technik bekannten Weise konstruiert sein.The printing unit 10 also includes inking rollers 22, an ink fountain 24 and a motor 26. The motor 26 drives a gear train (not shown) which is connected to the cylinders and rollers in the printing unit 10 and which are shown by the arrow in Fig. 1 indicated direction rotates. The engine 26 and the gear train can be constructed in the manner known in the art.

Beim Rotieren der Zylinder und Walzen durch den Motor 26 und den Getriebezug übertragen die Farbauftragwalzen 22 Farbe aus dem Farbkasten 24 auf die Druckplatte 18 auf dem Plattenzylinder 12. In dem Spalt 28 zwischen Plattenzylinder 12 und Gummituchzylinder 14 überträgt dann die Druckplatte 18 das eingefärbte Druckbild auf das Gummituch 20 auf dem Gummituchzylinder 14. Anschließend überträgt das Gummituch das eingefärbte Druckbild auf das zu bedruckende Material, welches vorzugsweise eine sich durch den Spalt 32 zwischen dem Gummituchzylinder 14 und dem Druckzylinder 15 bewegende Bahn ist. Wie in Fig. 1 gezeigt, ist der Druckzylinder 15 ein zweiter Gummituchzylinder mit einem zweiten hülsenförmigen Gummituch 34 zum gleichzeitigen Drucken auf der Gegenseite der Bahn 30.When the cylinders and rollers are rotated by the motor 26 and the gear train, the inking rollers 22 transfer ink from the ink fountain 24 to the printing plate 18 on the plate cylinder 12. In the gap 28 between the plate cylinder 12 and the blanket cylinder 14, the printing plate 18 then transfers the colored printing image the blanket 20 on the blanket cylinder 14. Then the blanket transfers the inked print image to the material to be printed, which is preferably a web moving through the gap 32 between the blanket cylinder 14 and the impression cylinder 15. As shown in FIG. 1, the impression cylinder 15 is a second blanket cylinder with a second sleeve-shaped blanket 34 for simultaneous printing on the opposite side of the web 30.

Wie zum Teil in Fig. 3 gezeigt, hat das Gummituch 20 ein Druckteil 40 und einen stützenden zylindrischen Körper 42. Das Druckteil 40 ist elastisch und hat eine zylindrische Form mit einer spaltlosen zylindrischen äußeren Druckfläche 44. Der zylindrische Körper 42 ist relativ starr und hat eine spaltlose zylindrische Innenfläche 46, die sich umfänglich vollständig um die Mantelfläche 48 des Gummituchzylinders 14 erstreckt. In der bevorzugten Ausführung der Erfindung ist der zylindrische Körper 42 aus Nickel hergestellt.As shown in part in Fig. 3, the blanket 20 has a pressure member 40 and a supporting cylindrical body 42. The pressure member 40 is elastic and has a cylindrical shape with a gapless cylindrical outer pressure surface 44. The cylindrical body 42 is relatively rigid and has a gapless cylindrical inner surface 46 which extends circumferentially completely around the outer surface 48 of the blanket cylinder 14. In the preferred embodiment of the invention, cylindrical body 42 is made of nickel.

Wie ferner in Fig. 3 gezeigt, besteht das Druckteil 40 des Gummituchs 20 aus Schichten. In der in den Zeichnungen dargestellten bevorzugten Ausführung besteht das Druckteil 40 aus Schichten, ähnlich den in dem U.S. Patent Nr. 3,700,541 - Shrimpton et al - offenbarten Schichten eines Gummituchs. Demgemäß hat das Druckteil 40 eine zusammenpreßbare Schicht 50, eine verstärkende Schicht 52 und eine Druckschicht 54.As further shown in Fig. 3, the pressure member 40 of the blanket 20 is made of layers. In the preferred embodiment shown in the drawings, the pressure member 40 is composed of layers similar to those shown in U.S. Pat. Patent No. 3,700,541 - Shrimpton et al - disclosed layers of a rubber blanket. Accordingly, the pressure member 40 has a compressible layer 50, a reinforcing layer 52 and a pressure layer 54.

Die zusammenpreßbare Schicht 50 in dem Druckteil 40 des Gummituchs 20 ist durch Verklebung auf dem zylindrischen Gummituchkörper 42 befestigt und stellt einen Körper 62 aus gummiartigem Material dar. Der Körper 62 aus gummiartigem Material hat gleichmäßig verteilte Mikrozellen 64, die dem Körper 62 die Zusammenpreßbarkeit verleihen. Die Mikrozellen entstehen durch die Einverleibing zusammenpreßbarer, hohler Mikrosphären 66 in das gummiartige Material des Körpers 62. Der Körper 62 des gummiartigen Materials könnte auch durch den Zusatz eines anderen Materials als Mikrosphären 66, z. B. durch aus dem U.S. Patent Nr. 3,887,750 - Duckett et al - bekannte zusammenpreßbare Fadenstücke zusammenpreßbar gemacht werden. Alternativ, könnte der Körper 62 durch bekannte Verfahren der Schaffung von Hohlräumen, wie durch aus dem U.S. Patent Nr. 4,025,685 - Haran et al - bekanntes Blasen und Auslaugen zusammenpreßbar gemacht werden.The compressible layer 50 in the pressure part 40 of the rubber blanket 20 is fastened by gluing to the cylindrical rubber blanket body 42 and represents a body 62 made of rubber-like material. The body 62 made of rubber-like material has evenly distributed microcells 64 which give the body 62 the compressibility. The microcells are created by incorporating compressible, hollow microspheres 66 into the rubber-like material of the body 62. The body 62 of the rubber-like material could also be produced by adding a material other than microspheres 66, e.g. B. can be made compressible by known from the US Patent No. 3,887,750 - Duckett et al - compressible pieces of thread. Alternatively, the body 62 could be made compressible by known methods of creating voids, such as blowing and leaching, known from US Patent No. 4,025,685 to Haran et al.

Die verstärkende Schicht 52 in dem Druckteil 40 des Gummituchs 20 besteht aus einem mit einer Polymermischung verbundenen Gewebe 70. Die Druckschicht 54 besteht aus einem Körper 72 aus gummiartigem Material und bildet die äußere Druckfläche 44 des Gummituchs 20. Anders als die in dem Shrimpton et al Patent gezeigte Druckschicht ist die Druckschicht 54 dieser Erfindung zylindrisch, und die äußere Druckflache 44 ist eine kontinuierliche, spaltlose zylindrische, sich umfänglich vollständig um das Gummituch 20 erstreckende Fläche.The reinforcing layer 52 in the pressure part 40 of the rubber blanket 20 consists of a fabric 70 connected with a polymer mixture. The pressure layer 54 consists of a body 72 made of rubber-like material and forms the outer pressure surface 44 of the rubber blanket 20. Unlike that in the Shrimpton et al The printing layer shown in the patent is cylindrical, the printing layer 54 of this invention, and the outer printing surface 44 is a continuous, gapless cylindrical surface extending all the way around the blanket 20.

Beim Rotieren der Walzen und Zylinder in dem Druckwerk 10 durch den Motor 26, wie in Fig. 1 gezeigt, bewegt sich in dem Spalt 28 zwischen dem Plattenzylinder 12 und dem Gummituchzylinder 14 die Druckplatte 18 auf dem Plattenzylinder 12 gegen das Gummituch 20 auf dem Gummituchzylinder 14. Wie in Fig. 3 gezeigt, ist das Gummituch eingedrückt, wo die Druckplatte 18 in dem Zylinderspalt 28 dagegen drückt. Die zusammenpreßbare Schicht 50 in dem Gummituch 20 wird unterhalb des eingedrückten Teils der Druckschicht 54 und der verstärkenden Schicht 52 zusammengepreßt. Die zusammenpreßbare Schicht 50 erlaubt also eine radiale Verlagerung der Druckschicht 54 und der verstärkenden Schicht 52 nach innen, so daß die Druckfläche 44 auf der Druckschicht 54 auf beiden Seiten des Zylinderspalts 28 nicht radial nach außen ausbeult. Würde die Druckfläche 44 zusätzlich zum radialen nach innen Eingedrücktwerden, wie in Fig. 3 gezeigt, auch radial nach außen ausbeulen, könnte durch eine solche Verformung der Druckfläche 44 das eingefärbte Druckbild bei der übertragung von dem Plattenzylinder 18 auf das Gummituch 20 verschmiert werden, wie dies im Stand der Technik bekannt ist.When the rollers and cylinders in the printing unit 10 rotate by the motor 26, as shown in FIG. 1, in the gap 28 between the plate cylinder 12 and the blanket cylinder 14, the printing plate 18 on the plate cylinder 12 moves against the blanket 20 on the blanket cylinder 14. As shown in FIG. 3, the rubber blanket is pressed in, where the pressure plate 18 presses against it in the cylinder gap 28. The compressible layer 50 in the rubber blanket 20 is compressed below the pressed-in part of the printing layer 54 and the reinforcing layer 52. The compressible layer 50 thus allows the pressure layer 54 and the reinforcing layer 52 to be displaced radially inwards, so that the pressure surface 44 on the pressure layer 54 on both sides of the cylinder gap 28 does not bulge radially outwards. If the printing surface 44 were also dented radially outwards in addition to being pressed radially inwards, as shown in FIG. 3, such a deformation of the printing surface 44 could smear the colored printing image during the transfer from the plate cylinder 18 to the rubber blanket 20, as is the case this is known in the prior art.

Wie deutlich in Fig. 4 gezeigt, hat das Gummituch 20 eine Zentralachse 90. Wie ebenfalls deutlich in Fig. 4 gezeigt, hat der Gummituchzylinder 14 eine Zentralachse 100 und ein Paar Zapfenwellen 102, auf welchen dieser lagert und um seine Zentralachse 100 in dem Druckwerk 10 rotiert. Der Gummituchzylinder 14 hat auch eine abgeschrägte Kantenfläche 106 an einem axialen Ende seiner Mantelfläche 48. Die Mantelfläche des Gummituchzylinders 14 hat einen Durchmesser, der geringfügig größer ist als der Innendurchmesser des zylindrischen Körpers 42 des Gummituchs 20. Die abgeschrägte Kantenfläche 106 des Gummituchzylinders 14 neigt sich von der Mantelfläche 48 aus radial nach innen und hat an ihrem radialen inneren Ende einen Durchmesser, der geringfügig kleiner ist als der Innendurchmesser des zylindrischen Körpers 42.As clearly shown in FIG. 4, the rubber blanket 20 has a central axis 90. As also clearly shown in FIG. 4, the blanket cylinder 14 has a central axis 100 and a pair of journal shafts 102 on which it is supported and rotates about its central axis 100 in the printing unit 10. The blanket cylinder 14 also has a chamfered edge surface 106 at an axial end of its jacket surface 48. The jacket surface of the rubber blanket cylinder 14 has a diameter which is slightly larger than the inner diameter of the cylindrical body 42 of the rubber blanket 20. The chamfered edge surface 106 of the rubber blanket cylinder 14 tilts radially inward from the lateral surface 48 and has a diameter at its radial inner end which is slightly smaller than the inner diameter of the cylindrical body 42.

Ferner hat der Gummituchzylinder 14 auf seiner Mantelfläche 48 eine Anzahl von Luftdurchflußöffnungen 108. Die Luftdurchflußöffnungen 108 sind umfänglich in einer Reihe in einem kleinen Abstand von der abgeschrägten Kantenfläche 106 angeordnet und sind durch eine Anzahl Luftöffnungen 112 (Fig. 2, 3) innerhalb des Gummituchzylinders 14 mit einem Lufteinlaß 110 verbunden. Der Lufteinlaß 110 ist wahlweise durch eine Druckluftleitung 116 mit einer Druckluftquelle 114 verbunden.Furthermore, the blanket cylinder 14 has a number of air flow openings 108 on its outer surface 48. The air flow openings 108 are arranged circumferentially in a row at a small distance from the beveled edge surface 106 and are through a number of air openings 112 (FIGS. 2, 3) within the rubber blanket cylinder 14 connected to an air inlet 110. The air inlet 110 is optionally connected to a compressed air source 114 by a compressed air line 116.

Wie durch den in Fig. 4 gezeigten Pfeil angedeutet, ist das Gummituch teleskopisch über den Gummituchzylinder überschiebbar. Da die Mantelfläche 48 des Gummituchzylinders 14 einen Durchmesser hat, der geringfügig größer ist als der Innendurchmesser des zylindrischen Körpers 42 in dem Gummituch 20, so wird der zylindrische Körper 42 gezwungen, sich diametral zu dehnen, wenn dieser sich gegen die abgeschrägte Kantenfläche 106 und axial auf die Mantelfläche 48 bewegt. Wenn der zylindrische Körper 42 mit seiner Innenfläche 46 axial über die Luftdurchflußöffnungen 108 auf der Mantelfläche 48 des Gummituchzylinders 14 bewegt wird, so wird von einer Quelle 114 Druckluft auf die Luftdurchflußöffnungen 108 gerichtet. Die Druckluft strömt radial aus den Öffnungen 108 und trifft auf die Innenfläche 46 des zylindrischen Körpers 42 auf, so daß dieser sich diametral dehnt.As indicated by the arrow in FIG. 4, the rubber blanket can be telescopically pushed over the rubber blanket cylinder. Since the outer surface 48 of the blanket cylinder 14 has a diameter that is slightly larger than the inner diameter of the cylindrical body 42 in the blanket 20, the cylindrical body 42 is forced to expand diametrically when it is against the beveled edge surface 106 and axially moved to the outer surface 48. If the cylindrical body 42 is moved with its inner surface 46 axially via the air flow openings 108 on the outer surface 48 of the blanket cylinder 14, one of them Source 114 compressed air directed at the air flow openings 108. The compressed air flows radially out of the openings 108 and strikes the inner surface 46 of the cylindrical body 42 so that it expands diametrically.

Die gegen die Innenfläche 46 des zylindrischen Körpers 42 gerichtete Druckluft dehnt den zylindrischen Körper 42 kontinuierlich während dieser axial über die Mantelfläche 48 des Gummituchzylinders 14 bewegt wird. Nachdem das Gummituch 20 axial in seine vorgesehene Position auf dem Gummituchzylinder 14 bewegt worden ist, wird der Luftdruck abgeschaltet. Der zylindrische Körper 42 zieht sich dann diametral um die Mantelfläche des Gummituchzylinders 14 in elastischer Weise zusammen. Somit ist das Gummituch 20, das einen ursprünglichen Innendurchmesser aufweist, der kleiner ist als der Durchmesser der Mantelfläche 48 des Gummituchzylinders 14, mit einem Festsitz auf dem Gummituchzylinder 14 installiert.The compressed air directed against the inner surface 46 of the cylindrical body 42 expands the cylindrical body 42 continuously while it is being moved axially over the outer surface 48 of the blanket cylinder 14. After the blanket 20 has been moved axially into its intended position on the blanket cylinder 14, the air pressure is switched off. The cylindrical body 42 then contracts diametrically around the outer surface of the blanket cylinder 14 in an elastic manner. Thus, the blanket 20, which has an original inner diameter that is smaller than the diameter of the outer surface 48 of the blanket cylinder 14, is installed with a tight fit on the blanket cylinder 14.

Das Gummituch 20 wird anschließend von dem Gummituchzylinder 14 entfernt, indem der zylindrische Körper 42 unter dem Einfluß von Druckluft wieder gedehnt und in diesem Zustand das Gummituch 20 axial von dem Gummituchzylinder 14 heruntergeschoben wird. Das Nickelmaterial des zylindrischen Körpers 42 besitzt die optimale Elastizität für das Installieren und Entfernen des Gummituchs in der oben beschriebenen Weise, wenn es einem Druck aus einer herkömmlichen pneumatischen Quelle von 6,2 x 105 N/m2 (6,2 Bar) unterworfen wird.The blanket 20 is then removed from the blanket cylinder 14 by stretching the cylindrical body 42 again under the influence of compressed air and in this state the blanket 20 is axially pushed down from the blanket cylinder 14. The nickel material of the cylindrical body 42 has the optimum elasticity for installing and removing the rubber blanket in the manner described above when subjected to a pressure from a conventional pneumatic source of 6.2 x 10 5 N / m 2 (6.2 bar) becomes.

Beim Dehnen des zylindrischen Körpers 42 in dem Gummituch 20 über dem Gummituchzylinder 14, wie hier oben beschrieben, verursacht der Fluß der Druckluft zwischen der Mantelfläche 48 des Gummituchzylinders 14 und der Innenfläche des zylindrischen Körpers 42 das Vibrieren des letzteren. Das Vibrieren des zylindrischen Körpers 42 verursacht wiederum Lärm. Deshalb besitzt das Gummituch 20 in der bevorzugten Ausführung ein Element zur Dämpfung von Lärm in der Form eines Vibrationsdämpfungsrings 120. Wie in den Fig. 4 und 5 gezeigt, ist der Dämpfungsring 120 auf der Innenfläche 46 des zylindrischen Körpers 42 angebracht und dämpft das Vibrieren desselben, das durch den Fluß der Druckluft zwischen der Mantelfläche 48 und der Innenfläche 46 verursacht wird. Somit reduziert der Dämpfungsring 120 den Lärmpegel, der von dem mit dem Druckwerk 10 arbeitenden Personal toleriert werden muß, beträchtlich.When the cylindrical body 42 in the blanket 20 is stretched over the blanket cylinder 14 as described hereinabove, the flow of compressed air between the jacket surface 48 of the blanket cylinder 14 and the inner surface of the cylindrical body 42 causes the latter to vibrate. The vibration of the cylindrical body 42 in turn causes Noise. Therefore, the blanket 20 in the preferred embodiment has a noise damping member in the form of a vibration damping ring 120. As shown in Figs. 4 and 5, the damping ring 120 is mounted on the inner surface 46 of the cylindrical body 42 and dampens the vibration thereof , which is caused by the flow of compressed air between the outer surface 48 and the inner surface 46. Thus, the damping ring 120 significantly reduces the level of noise that must be tolerated by personnel working with the printing unit 10.

In der bevorzugten Ausführung hat der zylindrische Körper 42 ein Endteil 122, das sich außerhalb des Endes des Gummituchzylinders 14 befindet, wenn das Gummituch 20 auf dem Gummituchzylinder 14 installiert ist, wie in Fig. 5 gezeigt. Der Dämpfungsring 120 ist auf der Innenfläche 46 an der Außenkante 124 des Endteils 122 befestigt. Durch den Dämpfungsring 120 kann dann der zylindrische Körper 42 an der Kante 124 leichter gehandhabt werden. Ferner wird der Dämpfungsring 120 durch die auf diesen wirkende Zentrifugalkraft, die bei der Rotation des Gummituchs 20 mit dem Gummituchzlinder 14 entsteht, in seiner Position auf der Innenfläche 46 des zylindrischen Körpers 42 gehalten. Der Dämpfungsring 120 könnte auch auf der Außenfläche des zylindrischen Körpers 42 angebracht sein, wie mit gestrichelter Linie in Fig. 5 gezeigt, aber die Zentrifugalkraft würde ihn durch die Rotation des Gummituchs von dem zylindrischen Körper 42 lösen. Der Dämpfungsring 120 müßte dann schon fester an den zylindrischen Körper 42 angebracht werden. Es können nach Bedarf auch weitere Dämpfungsringe oder andere Lärmdämpfungselemente verwendet werden, wofür das Material, die Dimension und die Stelle der Anbringung entsprechend gewählt werden müssen. Es könnte z. B. auch das andere Ende des Gummituchs 20 so ausgebildet sein wie es in Fig. 5 gezeigt ist, und es könnten einer oder mehrere Dämpfungsringe auf der Außenfläche des jeweiligen Endteils des zylindrischen Körpers 42 angebracht werden.In the preferred embodiment, the cylindrical body 42 has an end portion 122 that is outside the end of the blanket cylinder 14 when the blanket 20 is installed on the blanket cylinder 14, as shown in FIG. 5. The damping ring 120 is fixed on the inner surface 46 on the outer edge 124 of the end part 122. The damping ring 120 then makes it easier to handle the cylindrical body 42 at the edge 124. Furthermore, the damping ring 120 is held in its position on the inner surface 46 of the cylindrical body 42 by the centrifugal force acting thereon, which arises when the rubber blanket 20 rotates with the rubber blanket cylinder 14. The damping ring 120 could also be attached to the outer surface of the cylindrical body 42, as shown in broken lines in FIG. 5, but the centrifugal force would release it from the cylindrical body 42 by the rotation of the rubber blanket. The damping ring 120 would then have to be attached more firmly to the cylindrical body 42. Further damping rings or other noise damping elements can also be used as required, for which the material, the dimension and the location of the attachment must be selected accordingly. It could e.g. B. the other end of the blanket 20 may be formed as shown in Fig. 5, and one or a plurality of damping rings are attached to the outer surface of the respective end part of the cylindrical body 42.

Vorzugsweise besteht der Dämpfungsring 120 aus einem nachgiebigen Streifen eines harzartigen und/oder anderen Dämpfungsmaterials in einer Länge, die dem Umfang der Innenfläche 46 des zylindrischen Körpers 42 entspricht und ist mit einem Klebstoff permanent auf die Innenfläche 46 geklebt. In der in den Zeichnungen gezeigten bevorzugten Ausführung der Erfindung ist der Dämpfungsring 120 solch ein Streifen lärmdämpfenden Materials mit einer Klebeschicht; dieses Material wird von Sound Seal, einer Tochtergesellschaft der United Process, Inc., unter dem Warenzeichen "ANTIPHON LD-13" vertrieben.The damping ring 120 preferably consists of a resilient strip of a resin-like and / or other damping material with a length that corresponds to the circumference of the inner surface 46 of the cylindrical body 42 and is permanently glued to the inner surface 46 with an adhesive. In the preferred embodiment of the invention shown in the drawings, the damping ring 120 is such a strip of noise damping material with an adhesive layer; this material is distributed by Sound Seal, a subsidiary of United Process, Inc., under the trademark "ANTIPHON LD-13".

BEZUGSZEICHENLISTEREFERENCE SIGN LIST

1010th
DruckwerkPrinting unit
1212th
PlattenzylinderPlate cylinder
1414
GummituchzylinderBlanket cylinder
1515
DruckzylinderImpression cylinder
1616
SeitenrahmenSide frame
1818th
Druckplatteprinting plate
1919th
EinspannmechanismusClamping mechanism
2020th
GummituchRubber blanket
2222
FarbauftragwalzenInking rollers
2424th
FarbkastenPaint box
2626
Motorengine
2828
Spalt zwischen Zylindern 12 und 14Gap between cylinders 12 and 14
3030th
Bahntrain
3232
Spalt zwischen Zylindern 14 und 15Gap between cylinders 14 and 15
3434
zweites Gummituchsecond blanket
4040
Druckteil des Gummituchs 20Printing part of the blanket 20
4242
zylindrischer Körper des Gummituchs 20cylindrical body of the blanket 20
4444
äußere Druckfläche des Druckteils 40outer pressure surface of the pressure part 40
4646
Innenfläche des zylindrischen Körpers 42Inner surface of the cylindrical body 42
4848
Mantelfläche des Gummituchzylinders 14Shell surface of the blanket cylinder 14
5050
zusammenpreßbare Schichtcompressible layer
5252
verstärkende Schichtreinforcing layer
5454
DruckschichtPrint layer
6262
Körper aus gummiartigem MaterialBody made of rubber-like material
6464
MikrozellenMicrocells
6666
MikrosphärenMicrospheres
7070
Gewebe der verstärkenden SchichtReinforcing layer fabric
7272
Körper aus gummiartigem MaterialBody made of rubber-like material
9090
Zentralachse des Gummituchs 20Central axis of the blanket 20
100100
Zentralachse des Gummituchzylinders 14Central axis of the blanket cylinder 14
102102
ZapfenwellenPTO shafts
106106
abgeschrägte Kantenflächebeveled edge surface
108108
LuftdurchflußöffnungenAir flow openings
110110
LufteinlaßAir intake
112112
LuftöffnungenAir vents
114114
DruckluftquelleCompressed air source
116116
DruckluftleitungCompressed air line
120120
VibrationsdämpfungsringVibration damping ring
122122
Endteil des zylindrischen Körpers 42End part of the cylindrical body 42
124124
Außenkante des zylindrischen Körpers 42Outer edge of the cylindrical body 42

Claims (10)

  1. Sleeve-shaped rubber printing blanket (20) for fitting on a blanket cylinder (14) in an offset printing unit (10), the blanket cylinder (14) exhibiting at least one air-flow opening (108), from which compressed air flows over the blanket cylinder (14), the sleeve-shaped rubber blanket (20) comprising a cylindrical printing part (40) having an outer printing surface (44), a cylindrical body (42), which supports the printing part (40) and can be moved telescopically over the blanket cylinder (14), the cylindrical body (42), in its original state, having an inside diameter which is less than the diameter of the blanket cylinder (14) and, in its expanded state, having an inside diameter which is greater than the diameter of the blanket cylinder (14), and the cylindrical body (42) being moved, under the influence of compressed air flowing over the blanket cylinder (14), into the expanded state whilst the said cylindrical body (42) is located over the air-flow opening (108) in the blanket cylinder, characterized in that a damping ring (120) for damping the vibrations caused by the compressed air is fitted to one end part (122) of the cylindrical body (42).
  2. Sleeve-shaped rubber blanket (20) according to Claim 1, characterized in that the damping ring (120) extends peripherally around the cylindrical body (42).
  3. Sleeve-shaped rubber blanket (20) according to Claim 2, characterized in that the damping ring (120) is placed on the end part (122) extending axially beyond the printing part (40) within the end part (122) of the cylindrical body (42).
  4. Sleeve-shaped rubber blanket (20) according to Claim 3, characterized in that the cylindrical body (42) is fitted with a damping ring (120) at the end part which lies opposite the end part (122).
  5. Sleeve-shaped rubber blanket (20) according to Claim 3 or 4, characterized in that the damping ring (120) is permanently fastened to the end part (122) extending axially beyond the printing part (40) on the outer surface of the end part (122).
  6. Sleeve-shaped rubber blanket (20) according to Claim 3 or 4, characterized in that a plurality of damping rings (120) are fastened peripherally to the cylindrical body (42).
  7. Offset printing unit (10) having a blanket cylinder (14) having a contacting surface (48) and devices (108, 112) for feeding compressed air over the contacting surface (48) having a sleeve-shaped rubber blanket (20) which exhibits a cylindrical printing part (40) and a cylindrical body (42) which supports the latter and can be moved telescopically over the blanket cylinder (14), the cylindrical body (42), in its original state, having an inside diameter which is less than the diameter of the blanket cylinder (14) and, in its expanded state, having an inside diameter which is greater than the diameter of the blanket cylinder (14), the cylindrical body (42) being moved, under the influence of the compressed air, into the expanded state whilst the cylindrical body (42) is located over the blanket cylinder (14), characterized in that the sleeve-shaped rubber blanket (20) exhibits, on one end part (122) of the cylindrical body (42), a damping ring (120) for damping the vibrations caused by the compressed air.
  8. Printing unit (10) according to Claim 7, characterized in that the damping ring (120) extends peripherally around the inner side of the cylindrical body (42).
  9. Printing unit (10) according to Claim 7, characterized in that the damping ring (120) is fitted permanently on the cylindrical body (42).
  10. Printing unit (10) according to Claim 7, characterized in that the sleeve-shaped rubber blanket (20) has an installed position on the blanket cylinder (14), the cylindrical body (42) exhibiting an end part (122), which protrudes axially over the contacting surface (48) of the blanket cylinder (14), whenever the sleeve-shaped rubber blanket (20) is located in its installed position, and the damping ring (120) is located on the end part (122) of the cylindrical body (42).
EP93110104A 1992-07-07 1993-06-24 Blanket with noise dampening means Expired - Lifetime EP0581018B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US909730 1992-07-07
US07/909,730 US5215013A (en) 1992-07-07 1992-07-07 Printing blanket with noise attenuation

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Publication Number Publication Date
EP0581018A1 EP0581018A1 (en) 1994-02-02
EP0581018B1 true EP0581018B1 (en) 1997-01-08

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US (1) US5215013A (en)
EP (1) EP0581018B1 (en)
JP (1) JP3329890B2 (en)
DE (2) DE4320924C2 (en)

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DE4320924A1 (en) 1994-01-13
US5215013A (en) 1993-06-01
JPH06198837A (en) 1994-07-19
DE59305032D1 (en) 1997-02-20
DE4320924C2 (en) 2002-12-19
JP3329890B2 (en) 2002-09-30
EP0581018A1 (en) 1994-02-02

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