EP0133483B1 - Sheet guiding roll free of smears for rotary sheet printing machines - Google Patents

Sheet guiding roll free of smears for rotary sheet printing machines Download PDF

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Publication number
EP0133483B1
EP0133483B1 EP84108271A EP84108271A EP0133483B1 EP 0133483 B1 EP0133483 B1 EP 0133483B1 EP 84108271 A EP84108271 A EP 84108271A EP 84108271 A EP84108271 A EP 84108271A EP 0133483 B1 EP0133483 B1 EP 0133483B1
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EP
European Patent Office
Prior art keywords
air distribution
distribution elements
smear
air
free transfer
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
Application number
EP84108271A
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German (de)
French (fr)
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EP0133483A3 (en
EP0133483A2 (en
Inventor
Georg Jahn
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
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Heidelberger Druckmaschinen AG
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Publication date
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Priority to AT84108271T priority Critical patent/ATE23823T1/en
Publication of EP0133483A2 publication Critical patent/EP0133483A2/en
Publication of EP0133483A3 publication Critical patent/EP0133483A3/en
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Publication of EP0133483B1 publication Critical patent/EP0133483B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F22/00—Means preventing smudging of machine parts or printed articles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49861—Sizing mating parts during final positional association
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49863—Assembling or joining with prestressing of part
    • Y10T29/4987—Elastic joining of parts
    • Y10T29/49872—Confining elastic part in socket

Definitions

  • the invention relates to a lubrication-free transfer drum for sheet-fed rotary printing presses, in which blow holes are provided in the drum shell over the entire sheet-bearing drum circumference.
  • a device of this type is described in DE-C-1 561 043, according to which, in the case of a delivery drum for sheet-fed printing machines, the sheets are pushed away by air streams emerging from openings arranged on the circumference of the drum, with the drum as a whole being covered with a cover for the more uniform distribution of the emerging air known, porous and air-permeable material is provided.
  • the control of the air outlet from the individual openings requires an air control device inside the delivery drum which is very complex both in terms of construction and in terms of cost, the partial or temporal air control in particular causing great problems precisely at the points of the freshly printed sheet which are prone to smearing. Apart from this, there is always a great need for blowing air, which requires an unnecessarily large design of the units for blowing air generation. Even the smallest damage and contamination of the porous drum cover require its costly and time-consuming replacement.
  • the present invention has for its object to provide a maintenance-friendly transfer drum, in which, without time-consuming settings and without considerable control engineering effort, reliable lubrication of freshly printed sheets due to the build-up takes place evenly over the entire drum circumference with little blown air requirement an air cushion that is as free of turbulence and impulses as possible should be prevented.
  • the object thus achieved is achieved in that in the blow holes of the drum shell the blown air to build up a uniform air cushion flow-influencing air distribution elements are arranged, which are made of air-permeable, elastic and slightly compressible material of low specific gravity.
  • the structural distribution of a large number of individual air distribution elements over the entire drum circumference enables particularly safe, quiet and smear-free sheet transport. Since the choice of material and the shape of the individual arch supports make it very easy to empirically determine the flow conditions required to build up a closed, turbulence-free and pulse-jet-free air cushion, thereby also changing conditions in the printing process as quickly as possible, e.g. Processing of a different paper thickness, which can be taken into account, optimization of a particularly stable sheet transport is possible. Due to the easy interchangeability of individual, e.g. dirty air distribution elements also ensure the greatest possible degree of ease of maintenance and thus operational safety of the transfer drum.
  • the air distribution elements are made of chemically consolidated fleece and / or crimped chemical fibers.
  • the air distribution elements can easily be punched out of fleece or fiber mats in large quantities, so that their manufacturing costs are insignificant in relation to the rest of the transfer drum.
  • the fine structuring of the hair network of the fleece or chemical fibers has the effect of a multitude of air channels and thus causes a pressure reduction and very effective atomization of the blown air diffusely in all directions, which ensures particularly quiet sheet transport with optimal support of the sheet despite minimal contacting of the sheet is.
  • a preferred further development of the invention consists in that the air distribution elements are made of a two-composite plastic, the lower area consisting of reversibly deformable foam and the upper area made of chemically bonded fleece or crimped chemical fibers.
  • This has the advantage that a large number of commercially available foam sponges and mats, such as those e.g. can be used for industrial or household cleaning purposes, can be used to manufacture the air distribution elements. While the great elasticity of the foam gives the air distribution elements a very secure frictional fit in the blowholes, the bow is evenly supported by a large number of individual fleece hairs or fiber ends with minimal surface contact in primarily point-shaped contact zones.
  • the diameter of the air distribution elements is so much larger than that of the blow holes that the air distribution elements are held in their inserted state by their elastic tension.
  • the air distribution elements are provided at least at one end with a support collar with which they are supported at least on the inner drum edge in the M state.
  • the seat of the air distribution elements in the drum shell can be made even more secure by form-fitting support in order to counteract centrifugal forces acting on the air distribution elements on the one hand or pressure loads or tensile forces caused by the arc on the other hand.
  • the air distribution elements can only protrude as far as the drum surface.
  • the blow holes 4 are designed as through bores / and are preferably distributed in a uniform structure in the drum jacket 17.
  • air distribution elements 7 are arranged, which are made of an air-permeable, elastic and easily compressible material with a low specific weight, preferably stamped.
  • a chemically consolidated textile or plastic fleece or a network of crimped chemical fibers is used for the production. It has proven to be advantageous to produce the air distribution elements 7, as shown in FIG. 8, from a two-composite material, the lower area facing the inside of the drum made of the largest possible porous and reversibly deformable foam and the upper area facing the drum surface made of one of the previously mentioned materials.
  • Such two-composite materials are known in the form of sponges and mats for industrial and household cleaning purposes.
  • a material for their production which also has hydrophilic surface properties.
  • the air distribution elements 7 have a firm fit in the drum jacket 17, their diameter 29 is significantly larger than the diameter 29 of the blow holes 4 (FIG. 3). Due to their high compressibility, the air distribution elements 7 can be easily inserted into the blowholes 4 by simply compressing them, in which they are then held primarily non-positively by their elastic tension.
  • blow holes 4 are made as rough rough bores in the drum jacket 17.
  • the network of nonwoven fabric or chemical fibers with a multitude of smallest fiber parts can thus cling to the coarse inner surface of the blow holes 4 and thereby give the air distribution elements 7 an even more secure hold in the drum jacket 17 by means of form-fitting support.
  • the savings in cost-intensive fine work processes also reduce the production costs reduced to a minimum.
  • an additional form-fitting support for their tight fit in the drum jacket 17 can be provided.
  • the air distribution elements are provided for this purpose at their end facing the inside of the drum with a support collar 30, which rests in the inserted state of the air distribution elements 7 on the inner edge of the drum and thus, for example, counteract the centrifugal forces acting on the air distribution elements 7 when the transfer drum rotates can.
  • the same configuration can also be carried out in the opposite manner exclusively at the end of the air distribution elements 7 facing the drum surface in order to counteract excessive pressure load or tensile force of the sheet to be transported, for example when the sheet is being removed from the transfer drum 1. It is equally possible to use the air distribution elements 7 - as shown in Fig. 6 - to be provided with support collars 30 at both ends.
  • the inner support collar 30 or similar support measures proves to be an indispensable prerequisite for a firm fit of the air distribution elements 7 in the drum jacket 17.
  • the air distribution elements 7 are flush with the cylinder surface (FIGS. 3 and 8). Nevertheless, the dimensional accuracy of the air distribution elements 7 is of secondary importance in the production, since their ends of the air distribution elements 7, which protrude beyond the drum surface, can be directly adapted to the curvature of the drum surface by "shaving".
  • the air distribution elements 7 can be designed as arch supports and expediently protrude by a defined amount above the drum surface, since in this case their surface has an anti-smudge effect (FIG. 5). If no direct contact between the sheet to be transported and the surface of the air distribution elements 7 is desired, their length can be smaller than the thickness of the drum jacket 17, so that they still close within the blow holes 4 and do not reach the drum surface (FIG. 4).
  • a roller core 14 is mounted, which is provided at the end with a core bore 15.
  • an end disk 16 is fastened on the roller core 14, to which a drum jacket 17, preferably manufactured as a casting, is flanged in a known manner.
  • the end disk 14 is provided with an annular groove 18, which is connected to the core bore 15 of the roller core 14 via a blind bore 19.
  • the core hole 15 is by means of a
  • Air coupling 20 coupled to a blown air unit 22 via line means 21.
  • the air coupling 20 is indicated schematically in FIG. 2 as a stationary coupling sleeve 23, in which a coupling sleeve 24 driven into the end of the core hole 15 rotates.
  • the blown air generated by the blown air unit 22 can thus flow via the line means 21, the air coupling 20, the core hole 15, the blind hole 19 and the annular groove 18 into the interior of the transfer drum 1 or its individual drum chambers 9.
  • a freshly printed sheet 27 is taken over by the sheet detection devices 2 and 3 in this way - e.g. after turning the sheet in perfecting machines - that its still damp side is directed downwards against the drum surface.
  • the sheet 27 does not come to rest directly on the drum surface, but instead is evenly supported and carried by the air cushion emerging from the air distributors 7 over its entire surface, so that any direct contact between the still damp ink and the drum surface is excluded. If, contrary to expectations, there is a slight contact, the color-repellent surface design or material properties of the arch support 7 also make it difficult to transfer color from the arch 27 to the arch support 7.
  • blow holes 4 and air distribution elements 7 are of course not limited to the embodiments shown in the figures and laid down in the description.
  • Other shapes of blow holes 4 and air distribution elements 7 or choice of other materials for producing the air distribution elements 7 can be within the scope of the invention.

Landscapes

  • Treatment Of Fiber Materials (AREA)
  • General Details Of Gearings (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Screen Printers (AREA)
  • Rotary Presses (AREA)
  • Handling Of Continuous Sheets Of Paper (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)
  • Advancing Webs (AREA)
  • Displays For Variable Information Using Movable Means (AREA)
  • Devices For Checking Fares Or Tickets At Control Points (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Soil Working Implements (AREA)

Abstract

Smear-free transfer cylinder for sheet-fed rotary printing machines having a cylindrical casing formed with blow holes distributed over the entire sheet-carrying peripheral surface of the cylinder, includes air distribution elements respectively disposed in the blow holes for influencing blowing air flow out of the blow holes for forming a uniform air cushion, the air distribution elements being formed of air-permeable, elastic and slightly compressible material having a low specific gravity.

Description

Die Erfindung betrifft eine abschmierfreie Umführtrommel für Bogenrotationsdruckmaschinen, bei der im Trommelmantel über den gesamten bogentragenden Trommelumfang verteilt, Blaslöcher vorgesehen sind.The invention relates to a lubrication-free transfer drum for sheet-fed rotary printing presses, in which blow holes are provided in the drum shell over the entire sheet-bearing drum circumference.

Zum Überführen frisch bedruckter Bogen von einem zum nächstfolgenden Druckwerk oder vom letzten Druckwerk zum Ausleger einer Druckmaschine sind Einrichtungen bekannt, bei denen der Bogen durch aus dem Bogenführungsmittel austretende Blasluft während seines Transports gestützt und dadurch ein qualitätsbeeinträchtigendes Abschmieren oder gar Verwischen der noch nassen Druckfarbe verhindert werden soll.For transferring freshly printed sheets from one to the next printing unit or from the last printing unit to the delivery of a printing press, devices are known in which the sheet is supported by blowing air escaping from the sheet guiding means during its transport, thereby preventing smearing or even blurring of the still wet printing ink, which impairs quality should.

Eine Einrichtung dieser Art beschreibt die DE-C- 1 561 043, nach der bei einer Auslegertrommel für Bogendruckmaschinen die Bogen durch aus am Trommelumfang angeordnete Öffnungen austretende Luftströme weggedrückt werden, wobei zur gleichmäßigeren Verteilung der austretenden Luft die Trommel insgesamt mit einer Abdeckung aus an sich bekanntem, porösem und luftdurchlässigem Material versehen ist. Die Steuerung des Luftaustrittes aus den einzelnen Öffnungen erfordert eine sowohl konstruktiv als auch kostenmäßig sehr aufwendige Luftsteuereinrichtung im Innern der Auslegertrommel, wobei insbesondere die partielle bzw. zeitliche Luftsteuerung genau an den abschmiergefährdeten Stellen des frisch bedruckten Bogens große Probleme aufwirft. Abgesehen davon, wird stets ein großer Bedarf an Blasluft benötigt, was eine unnötig große Auslegung der Aggregate zur Blaslufterzeugung erfordert. Bereits kleinste Beschädigungen und Verschmutzungen der porösen Trommelabdeckung erfordern deren kostspieligen und zeitaufwendigen Austausch.A device of this type is described in DE-C-1 561 043, according to which, in the case of a delivery drum for sheet-fed printing machines, the sheets are pushed away by air streams emerging from openings arranged on the circumference of the drum, with the drum as a whole being covered with a cover for the more uniform distribution of the emerging air known, porous and air-permeable material is provided. The control of the air outlet from the individual openings requires an air control device inside the delivery drum which is very complex both in terms of construction and in terms of cost, the partial or temporal air control in particular causing great problems precisely at the points of the freshly printed sheet which are prone to smearing. Apart from this, there is always a great need for blowing air, which requires an unnecessarily large design of the units for blowing air generation. Even the smallest damage and contamination of the porous drum cover require its costly and time-consuming replacement.

Um diese Nachteile des Standes der Technik zu vermeiden, liegt der vorliegenden Erfindung die Aufgabe zugrunde, eine wartungsfreundliche Umführtrommel zu schaffen, bei der ohne zeitraubende Einstellungen und ohne erheblichen steuerungstechnischen Aufwand gleichmäßig über den gesamten Trommelumfang mit geringem Blasluftbedarf zuverlässig ein Abschmieren frisch bedruckter Bogen durch Aufbau eines möglichst turbulenz- und impulsfreien Luftpolsters verhindert werden soll.In order to avoid these disadvantages of the prior art, the present invention has for its object to provide a maintenance-friendly transfer drum, in which, without time-consuming settings and without considerable control engineering effort, reliable lubrication of freshly printed sheets due to the build-up takes place evenly over the entire drum circumference with little blown air requirement an air cushion that is as free of turbulence and impulses as possible should be prevented.

Die derart gestellte Aufgabe wird erfindungsgemäß dadurch gelöst, daß in den Blaslöchern des Trommelmantels die austretende Blasluft zum Aufbau eines gleichmäßigen Luftpolsters strömungsgünstig beeinflussende Luftverteilelemente angeordnet sind, die aus luftdurchlässigem, elastischem und leicht kompressiblem Material geringer spezifischer Wichte hergestellt sind.The object thus achieved is achieved in that in the blow holes of the drum shell the blown air to build up a uniform air cushion flow-influencing air distribution elements are arranged, which are made of air-permeable, elastic and slightly compressible material of low specific gravity.

Die strukturelle Verteilung einer Vielzahl einzelner Luftverteilelemente auf dem gesamten Trommelumfang ermöglicht einen besonders sicheren, ruhigen und abschmierfreien Bogentransport. Da sich durch die Wahl des Werkstoffes sowie der Formgebung der einzelnen Bogenträger die zum Aufbau eines geschlossenen, turbulenz- und impulsstrahlfreien Luftpolsters erforderlichen Strömungsverhältnisse sehr einfach auf empirische Weise ermitteln lassen und dadurch auch schnellstmöglich sich ändernden Gegebenheiten im Druck-Prozeß, z.B. Verarbeitung einer anderen Papierstärke, Rechnung getragen werden kann, ist eine Optimierung eines besonders stabilen Bogentransportes möglich. Durch die leichte Austauschbarkeit einzelner, z.B. verschmutzter Luftverteilelemente ist außerdem ein größtmögliches Maß an Wartungsfreundlichkeit und somit Betriebssicherheit der Umführtrommel gewährleistet. Die Möglichkeit des Einsatzes von Materialien unterschiedlicher Luftdurchlässigkeit für die Bogenträger erlaubt mittels geschickter Materialauswahl eine genaue Anpassung des Luftpolsters der Umführtrommel an die Verarbeitung unterschiedlicher Papiergewichte, wodurch jeweils mit einem Minimum an Blasluft ausgekommen und das Blasluftaggregat relativ klein dimensioniert werden kann.The structural distribution of a large number of individual air distribution elements over the entire drum circumference enables particularly safe, quiet and smear-free sheet transport. Since the choice of material and the shape of the individual arch supports make it very easy to empirically determine the flow conditions required to build up a closed, turbulence-free and pulse-jet-free air cushion, thereby also changing conditions in the printing process as quickly as possible, e.g. Processing of a different paper thickness, which can be taken into account, optimization of a particularly stable sheet transport is possible. Due to the easy interchangeability of individual, e.g. dirty air distribution elements also ensure the greatest possible degree of ease of maintenance and thus operational safety of the transfer drum. The possibility of using materials with different air permeability for the sheet carrier allows a precise adjustment of the air cushion of the transfer drum to the processing of different paper weights by means of a clever choice of materials, which means that a minimum of blown air can be used and the blown air unit can be dimensioned relatively small.

Eine besonders einfache und kostengünstige Massenherstellung wird dadurch ermöglicht, daß die Luftverteilelemente aus chemisch verfestigtem Vlies und/oder gekräuselten Chemiefasern hergestellt sind. Dadurch lassen sich die Luftverteilelemente aus Vlies- oder Fasermatten in großen Stückzahlen leicht herausstanzen, so daß deren Herstellungskosten in bezug auf die restliche Umführtrommel unbedeutend sind. Die feine Strukturierung des Haarnetzwerkes der Vlies- oder Chemiefasern wirkt sich wie eine Vielzahl von Luftkanälen aus und verursacht dadurch eine Druckverminderung und sehr effektive Zerstäubung der Blasluft diffus nach allen Richtungen, wodurch ein besonders ruhiger Bogentransport mit optimaler Stützung des Bogens trotz minimaler Kontaktierung des Bogens gewährleistet ist.A particularly simple and inexpensive mass production is made possible in that the air distribution elements are made of chemically consolidated fleece and / or crimped chemical fibers. As a result, the air distribution elements can easily be punched out of fleece or fiber mats in large quantities, so that their manufacturing costs are insignificant in relation to the rest of the transfer drum. The fine structuring of the hair network of the fleece or chemical fibers has the effect of a multitude of air channels and thus causes a pressure reduction and very effective atomization of the blown air diffusely in all directions, which ensures particularly quiet sheet transport with optimal support of the sheet despite minimal contacting of the sheet is.

Eine bevorzugte Weiterbildung der Erfindung besteht darin, daß die Luftverteilelemente aus einem Zweiverbund-Kunststoff hergestellt sind, wobei der untere Bereich aus reversibel verformbarem Schaumstoff und der obere Bereich aus chemisch verfestigtem Vlies bzw. gekräuselten Chemiefasern besteht. Dies hat den Vorteil, daß eine Vielzahl handelsüblicher Schaumstoffschwämme und -matten, wie sie z.B. für Industrie- oder Haushaltsreinigungszwecke benutzt werden, zur Herstellung der Luftverteilelemente dienen können. Während die große Elastizität des Schaumstoffes den Luftverteilelementen einen sehr sicheren kraftschlüssigen Sitz in den Blaslöchern verleiht, wird der Bogen selbst von einer Vielzahl einzelner Vlieshaare bzw. Faserenden unter geringster Flächenberührung in primär Punktförmigen Berührungszonen gleichmäßig gestützt.A preferred further development of the invention consists in that the air distribution elements are made of a two-composite plastic, the lower area consisting of reversibly deformable foam and the upper area made of chemically bonded fleece or crimped chemical fibers. This has the advantage that a large number of commercially available foam sponges and mats, such as those e.g. can be used for industrial or household cleaning purposes, can be used to manufacture the air distribution elements. While the great elasticity of the foam gives the air distribution elements a very secure frictional fit in the blowholes, the bow is evenly supported by a large number of individual fleece hairs or fiber ends with minimal surface contact in primarily point-shaped contact zones.

Zwecks Verbesserung des Haltes der Luftverteilelemente im Trommelmantel zwecks Erhöhung der Betriebssicherheit ist der Durchmesser der Luftverteilelemente um soviel größer als der der Blaslöcher, daß dadurch die Luftverteilelemente in eingesetztem Zustand durch ihre Elastizitätsspannung gehalten werden.In order to improve the hold of the Air distribution elements in the drum jacket for the purpose of increasing operational safety, the diameter of the air distribution elements is so much larger than that of the blow holes that the air distribution elements are held in their inserted state by their elastic tension.

In Ausbledüng der Erfindung sind die Luftverteilelemente zumindest an einem Ende mit einern Stützbund versehen, mit dem sie sich im M gesetzten Zustand zumindest am inneren Trommelrand abstützen. Durch diese Maßnahme kann der Sitz der Luftverteilelemente im Trommelmantel durch formschlüssige Unterstützung noch sicherer gestaltet werden, um einerseits auf die Luftverteilelemente einwirkenden Fliehkräften oder andererseits durch den Bogen verursachten Druckbelastungen bzw. Zugkräften entgegenzuwirken.In Ausbledüng the invention, the air distribution elements are provided at least at one end with a support collar with which they are supported at least on the inner drum edge in the M state. With this measure, the seat of the air distribution elements in the drum shell can be made even more secure by form-fitting support in order to counteract centrifugal forces acting on the air distribution elements on the one hand or pressure loads or tensile forces caused by the arc on the other hand.

Damit der Wirkungsradius, der aus den einzelnen Luftverteilern austretenden Blasluft größer wird, und es zu einer regelmäßigen Überdeckung bzw. Aneinanderkettung der einzelnen Luftaustritte zwecks Bildung eines zusammenhängenden Luftpolsters kommt, wird vorgeschlagen, daß sich sowohl die Blaslöcher als auch die zugehörigen Luftverteilelemente zur Trommeloberfläche hin konisch erweitern.So that the radius of action, the blowing air emerging from the individual air distributors is larger, and there is a regular overlap or chaining of the individual air outlets to form a coherent air cushion, it is proposed that both the blowing holes and the associated air distribution elements conical towards the drum surface expand.

Um jeden - wenn auch noch so geringen - Kontakt zwischen den einzelnen Luftverteilelementen und der frisch bedruckten Bogenunterseite zu verhindern, können die Luftverteilelemente nur bis maximal zur Trommeloberfläche ragen.In order to prevent any contact, however small, between the individual air distribution elements and the freshly printed underside of the sheet, the air distribution elements can only protrude as far as the drum surface.

Weitere vorteilhafte Ausgestaltungen der Erfindung sind in den Ansprüchen 4 und 5 sowie 10 und 11 und in der nachfolgenden Beschreibung niedergelegt.Further advantageous embodiments of the invention are set out in claims 4 and 5 and 10 and 11 and in the description below.

Die Erfindung ist nachfolgend anhand mehrerer in den Figuren dargestellten Ausführungsformen näher beschrieben.The invention is described below with reference to several embodiments shown in the figures.

Es zeigt:

  • Fig. 1 vereinfacht dargestellt einen Querschnitt durch eine Umführtrommel nach der Erfindung,
  • Fig. 2 auszugsweise einen schematischen Längsschnitt durch die Umführtrommel gemäß Fig. 1,
  • Fig 3-8 Querschnitte durch den Trommelmantel mit schematisch dargestellten Ausführungsformen der Luftverteilelemente.
It shows:
  • 1 shows a simplified cross section through a transfer drum according to the invention,
  • 2 is a schematic longitudinal section of the extracting drum according to FIG. 1,
  • Fig. 3-8 cross sections through the drum shell with schematically illustrated embodiments of the air distribution elements.

Gemäß Fig. 1 ist die Trommeloberfläche einer als Blaslufttrommel ausgebildeten Umführtrommel 1, mit schematisch angedeuteten Bogenerfassungseinrichtungen 2 und 3, über den gesamten Trommelumfang mit Blaslöchern 4 versehen, die bereits bei der Herstellung der Umführtrommel miteingegossen oder auch nachträglich mechanisch gefertigt, z.B. gebohrt, sein können. Die Blaslöcher4 sind dabei als Durchgangsbohrungen ausgebildet/ und vorzugsweise in gleichmäßiger Struktur im Trommelmantel 17 verteilt.1, the drum surface of a transfer drum 1 designed as a blow air drum, with schematically indicated sheet detection devices 2 and 3, is provided over the entire drum circumference with blow holes 4, which are already cast in during the manufacture of the transfer drum or are subsequently mechanically manufactured, e.g. bored, can be. The blow holes 4 are designed as through bores / and are preferably distributed in a uniform structure in the drum jacket 17.

In den Blaslöchern 4 sind Luftverteilelemente 7 angeordnet, die aus einem luftdurchlässigen, elastischen und leicht kompressiblen Material mit geringem spezifischen Gewicht hergestellt, vorzugsweise gestanzt sind. Für die Herstellung wird dabei ein chemisch verfestigter Textil- bzw. Kunststoffvlies oder ein Netzwerk aus gekräuselten Chemiefasern verwendet. Als vorteilhaft hat es sich erwiesen, die Luftverteilelemente 7, wie in Fig. 8 dargestellt, aus einem Zweiverbund-Werkstoff herzustellen, wobei der untere dem Trommelinnern zugewandte Bereich aus möglichst grobporigem und reversibel verformbarem Schaumstoff und der obere, der Trommeloberfläche zugewandte Bereich aus einem der zuvor erwähnten Materialien besteht. Derartige Zweiverbund-Werkstoffe sind in Form von Schwämmen und Matten für Industrie-und Haushaltsreinigungszwecke bekannt. Ausgehend von der Zweckbestimmung der Luftverteilelemente 7 bietet es sich an, für deren Herstellung außerdem ein Material zu verwenden, das auch hydrophile Oberflächeneigenschaften aufweist.In the blow holes 4, air distribution elements 7 are arranged, which are made of an air-permeable, elastic and easily compressible material with a low specific weight, preferably stamped. A chemically consolidated textile or plastic fleece or a network of crimped chemical fibers is used for the production. It has proven to be advantageous to produce the air distribution elements 7, as shown in FIG. 8, from a two-composite material, the lower area facing the inside of the drum made of the largest possible porous and reversibly deformable foam and the upper area facing the drum surface made of one of the previously mentioned materials. Such two-composite materials are known in the form of sponges and mats for industrial and household cleaning purposes. On the basis of the intended use of the air distribution elements 7, it is advisable to use a material for their production which also has hydrophilic surface properties.

Damit die Luftverteilelemente 7 einen festen Sitz im Trommelmantel 17 haben, ist ihr Durchmesser 29 wesentlich größer als der Durchmesser 29 der Blaslöcher 4 (Fig. 3). Aufgrund ihrer hohen Kompressibilität lassen sich die Luftverteilelemente 7 durch einfaches Zusammendrücken leicht in die Blaslöcher 4 einsetzen, in denen sie dann Primär kraftschlüssig durch ihre Elastizitätsspannung gehalten werden.So that the air distribution elements 7 have a firm fit in the drum jacket 17, their diameter 29 is significantly larger than the diameter 29 of the blow holes 4 (FIG. 3). Due to their high compressibility, the air distribution elements 7 can be easily inserted into the blowholes 4 by simply compressing them, in which they are then held primarily non-positively by their elastic tension.

Es hat sich als Vorteil erwiesen, wenn die Blaslöcher 4 als grobe Schruppbohrungen in den Trommelmantel 17 eingebracht werden. Das Netzwerk aus Vliesstoff bzw. Chemiefasern mit einer Vielzahl kleinster Faserteile kann sich somit an der groben Innenfläche der Blaslöcher 4 festkrallen und gibt dadurch den Luftverteilelementen 7 durch formschlüssige Unterstützung einen noch sichereren Halt im Trommelmantel 17. Dabei werden durch die Einsparung kostenintensiver Feinarbeitsgänge die Herstellungskosten außerdem auf ein Minimum reduziert.It has proven to be advantageous if the blow holes 4 are made as rough rough bores in the drum jacket 17. The network of nonwoven fabric or chemical fibers with a multitude of smallest fiber parts can thus cling to the coarse inner surface of the blow holes 4 and thereby give the air distribution elements 7 an even more secure hold in the drum jacket 17 by means of form-fitting support. The savings in cost-intensive fine work processes also reduce the production costs reduced to a minimum.

Je nach Art und physikalischen Eigenschaften des für die Herstellung der Luftverteilelemente verwendeten Materials kann eine zusätzliche formschlüssige Unterstützung für deren festen Sitz im Trommelmantel 17 angebracht sein. Gemäß Fig. 4 und 5 sind zu diesem Zweck die Luftverteilelemente an ihrem dem Trommelinnern zugewandten Ende mit einem Stützbund 30 versehen, der im eingesetzten Zustand der Luftverteilelemente 7 am inneren Trommelrand anliegt und somit beispielsweise den bei Rotation der Umführtrommel auf die Luftverteilelemente 7 einwirkenden Fliehkräften entgegenwirken kann. Dieselbe Ausgestaltung kann in umgekehrter Weise auch ausschließlich an dem der Trommeloberfläche zugewandten Ende der Luftverteilemente 7 erfolgen, um zu hoher Druckbelastung oder Zugkraft des zu transportierenden Bogens, z.B. bei dessen Abzug von der Umführtrommel 1, entgegenzuwirken. Ebensogut ist es möglich, die Luftverteilelemente 7 - wie in Fig. 6 dargestellt - an beiden Enden mit Stützbunden 30 zu versehen.Depending on the type and physical properties of the material used for the production of the air distribution elements, an additional form-fitting support for their tight fit in the drum jacket 17 can be provided. 4 and 5, the air distribution elements are provided for this purpose at their end facing the inside of the drum with a support collar 30, which rests in the inserted state of the air distribution elements 7 on the inner edge of the drum and thus, for example, counteract the centrifugal forces acting on the air distribution elements 7 when the transfer drum rotates can. The same configuration can also be carried out in the opposite manner exclusively at the end of the air distribution elements 7 facing the drum surface in order to counteract excessive pressure load or tensile force of the sheet to be transported, for example when the sheet is being removed from the transfer drum 1. It is equally possible to use the air distribution elements 7 - as shown in Fig. 6 - to be provided with support collars 30 at both ends.

Damit der Wirkungsradius der aus den einzelnen Luftverteilern 7 austretende Blasluft vergrößert wird und es zu einer Überlappung der aus der Vielzahl der einzelnen Blaslöcher 4 nach allen Richtungen austretenden Luft mit der aus den benachbarten Blaslöchern 4 kommt, sind diese gemäß Fig. 7 mit zur Trommeloberfläche hin konischer Erweiterung 31 ausgeführt und die zugehörigen Luftverteilelemente 7 in äquivalenter Form ausgebildet. Bei dieser Ausführung erweist sich der innere Stützbund 30 oder ähnliche Stützenmaßnahmen als unabdingbare Voraussetzung für einen festen Sitz der Luftverteilelemente 7 im Trommelmantel 17.So that the effective radius of the blowing air emerging from the individual air distributors 7 is increased and there is an overlap of the air emerging from the multitude of the individual blowing holes 4 in all directions with that from the neighboring blowing holes 4, these are shown in FIG. 7 with the drum surface conical extension 31 executed and the associated air distribution elements 7 formed in an equivalent form. In this embodiment, the inner support collar 30 or similar support measures proves to be an indispensable prerequisite for a firm fit of the air distribution elements 7 in the drum jacket 17.

Damit die Homogenität der Trommeloberfläche im wesentlichen gewahrt bleibt und nicht unnötig durch Erhöhungen oder Erniedrigungen unterbrochen wird, ist es zweckmäßig, wenn die Luftverteilelemente 7 mit der Zylinderoberfläche bündig abschließen (Fig. 3 und 8). Trotzdem ist die Längenmaßhaltigkeit der Luftverteilelemente 7 bei der Herstellung von nebensächlicher Bedeutung, da man deren über die Trommeloberfläche hinausragenden Enden der Luftverteilelemente 7 im eingesetzten Zustand durch "Abrasieren" direkt der Krümmung der Trommeloberfläche genau anpassen kann.So that the homogeneity of the drum surface is essentially maintained and is not unnecessarily interrupted by increases or decreases, it is expedient if the air distribution elements 7 are flush with the cylinder surface (FIGS. 3 and 8). Nevertheless, the dimensional accuracy of the air distribution elements 7 is of secondary importance in the production, since their ends of the air distribution elements 7, which protrude beyond the drum surface, can be directly adapted to the curvature of the drum surface by "shaving".

Bei Verwendung eines Materials mit hydrophilen Oberflächeneigenschaften kann man die Luftverteilelemente 7 als Bogenträger ausbilden und zweckmäßigerweise um ein definiertes Maß über die Trommeloberfläche hinausragen lassen, da in diesem Fall ihre Oberfläche abschmierverhindernde Wirkung aufweist (Fig. 5). Ist keine direkte Berührung zwischen dem zu transportierenden Bogen und der Oberfläche der Luftverteilelemente 7 erwünscht, kann deren Länge kleiner sein als die Dicke des Trommelmantels 17, so daß dieselben noch innerhalb der Blaslöcher 4 abschließen und nicht bis zur Trommeloberfläche reichen (Fig. 4).When using a material with hydrophilic surface properties, the air distribution elements 7 can be designed as arch supports and expediently protrude by a defined amount above the drum surface, since in this case their surface has an anti-smudge effect (FIG. 5). If no direct contact between the sheet to be transported and the surface of the air distribution elements 7 is desired, their length can be smaller than the thickness of the drum jacket 17, so that they still close within the blow holes 4 and do not reach the drum surface (FIG. 4).

Der grundsätzliche Aufbau der Umführtrommel ist nachfolgend anhand Fig. 2 näher beschrieben, wobei der Weg der die Umführtrommel durchströmenden Blasluft mit Pfeilen 10 dargestellt ist.The basic structure of the transfer drum is described in more detail below with reference to FIG. 2, the path of the blowing air flowing through the transfer drum being represented by arrows 10.

In einem Lager 12 der der Antriebsseite der Druckmaschine gegenüberliegenden Seitenwand 13 ist ein Walzenkern 14 gelagert, der endseitig mit einer Kernbohrung 15 versehen ist. Innerhalb der Seitenwand 13 ist auf dem Walzenkern 14 eine Stirnscheibe 16 befestigt, an der ein vorzugsweise als Gußstück gefertigter Trommelmantel 17 in bekannter Weise angeflanscht ist. Auf der dem Trommelinnern zugewandten Seite ist die Stirnscheibe 14 mit einer Ringnut 18 versehen, die über eine Sacklochbohrung 19 mit der Kernbohrung 15 des Walzenkerns 14 in Verbindung steht. Die Kernlochbohrung 15 ist mittels einerIn a bearing 12 of the side wall 13 opposite the drive side of the printing press, a roller core 14 is mounted, which is provided at the end with a core bore 15. Within the side wall 13, an end disk 16 is fastened on the roller core 14, to which a drum jacket 17, preferably manufactured as a casting, is flanged in a known manner. On the side facing the inside of the drum, the end disk 14 is provided with an annular groove 18, which is connected to the core bore 15 of the roller core 14 via a blind bore 19. The core hole 15 is by means of a

Luftkupplung 20 über Leitungsmittel 21 mit einem Blasluftaggregat 22 gekoppelt. Die Luftkupplung 20 ist in Fig. 2 schematisch als stationäre Kupplungsmuffe 23 angedeutet, in der eine in die Kernlochbohrung 15 endseitig eingetriebene Kupplungshülse 24 umläuft. Die vom Blasluftaggregat 22 erzeugte Blasluft kann somit über die Leitungsmittel 21 die Luftkupplung 20, die Kernlochbohrung 15, die Sacklochbohrung 19 und die Ringnut 18 in den Innenraum der Umführtrommel 1 bzw. deren einzelne Trommelkammern 9 einströmen.Air coupling 20 coupled to a blown air unit 22 via line means 21. The air coupling 20 is indicated schematically in FIG. 2 as a stationary coupling sleeve 23, in which a coupling sleeve 24 driven into the end of the core hole 15 rotates. The blown air generated by the blown air unit 22 can thus flow via the line means 21, the air coupling 20, the core hole 15, the blind hole 19 and the annular groove 18 into the interior of the transfer drum 1 or its individual drum chambers 9.

Die Arbeitsweise der Umführtrommel 1 nach der Erfindung wird nachfolgend näher beschrieben,The operation of the transfer drum 1 according to the invention is described in more detail below,

Ein frisch bedruckter Bogen 27 wird von den Bogenerfassungseinrichtungen 2 und 3 derart übernommen - z.B. nach einer Bogenwendung in Schön- und Widerdruckmaschinen - daß seine noch druckfeuchte Seite nach unten gegen die Trommeloberfläche gerichtet ist. Dabei kommt der Bogen 27 jedoch nicht unmittelbar auf der Trommeloberfläche zu liegen, sondern wird stattdessen von dem aus den Luftverteilern 7 austretenden Luftpolster über seine gesamte Fläche gleichmäßig gestützt und getragen, so daß jeder direkte Kontakt zwischen noch druckfeuchter Farbe und Trommeloberfläche ausgeschlossen wird. Sollte dennoch wider Erwarten in geringfügigem Maß ein Kontakt stattfinden, so wird durch die farbabstoßende Oberflächengestaltung bzw. Materialeigenschaft der Bogenträger 7 außerdem eine Farbübertragung vom Bogen 27 auf die Bogenträger 7 erschwert.A freshly printed sheet 27 is taken over by the sheet detection devices 2 and 3 in this way - e.g. after turning the sheet in perfecting machines - that its still damp side is directed downwards against the drum surface. However, the sheet 27 does not come to rest directly on the drum surface, but instead is evenly supported and carried by the air cushion emerging from the air distributors 7 over its entire surface, so that any direct contact between the still damp ink and the drum surface is excluded. If, contrary to expectations, there is a slight contact, the color-repellent surface design or material properties of the arch support 7 also make it difficult to transfer color from the arch 27 to the arch support 7.

Die Erfindung ist selbstverständlich nicht auf die in den Figuren dargestellten und in der Beschreibung niedergelegten Ausführungsformen beschränkt. Andere Formgestaltung von Blaslöchern 4 und Luftverteilelementen 7 oder Wahl anderer Materialien zur Herstellung der Luftverteilelemente 7 können im Rahmen der Erfindung liegen.The invention is of course not limited to the embodiments shown in the figures and laid down in the description. Other shapes of blow holes 4 and air distribution elements 7 or choice of other materials for producing the air distribution elements 7 can be within the scope of the invention.

Claims (11)

1. Smear-free transfer cylinder for sheet-fed rotary printing machines having a cylindrical casing which is provided with blow holes distributed over the entire sheet-carrying circumference of said cylinder, wherein in the blow holes (4) of the cylindrical casing there are disposed air distribution elements (7) favourably influencing the flow of the escaping blowing air for forming a uniform air cushion, said air distribution elements being produced of an air- permeable, elastic and slightly compressible material having a low specific gravity.
2. Smear-free transfer cylinder according to claim 1, wherein the air distribution elements (7) are produced of chemically stiffened fleece and/or curled synthetic fibres.
3. Smear-free transfer cylinder according to one or both of the preceding claims, wherein the air distribution elements (7) are produced of a two-component compound synthetic material, whereby the lower region is formed of reversibly formable foam material and the upper region of chemically stiffened fleece or curled synthetic fibres.
4. Smear-free transfer cylinder according to one or several of the preceding claims, wherein the air distribution elements (7) are produced of hydrophilic material.
5. Smear-free transfer cylinder according to one or several of the preceding claims, wherein the air distribution elements (7) are disposed in the blow holes (4) in a force-fit and/or form-fit manner.
6. Smear-free transfer cylinder according to one or several of the preceding claims, wherein the air distribution element (7) has a respective diameter (29) to such an extent greater than the diameter (28) of the respective blow hole (4) that the air distribution element (7) is retained due to its eleastic tension when inserted in the blow hole.
7. Smear-free transfer cylinder according to one or several of the preceding claims, wherein the air distribution element (7) is provided, at least at one end thereof, with a supporting collar (30) by means of which said air distribution element is braced at least against the inner edge of the cylinder when inserted in the blow hole.
8. Smear-free transfer cylinder according to one or several of the preceding claims, wherein the blow holes (4) and the air distribution elements (7) appertaining thereto widen conically towards the surface of the cylinder.
9. Smear-free transfer cylinder according to one or several of the preceding claims, wherein the air distribution elements (7) project maximally to the surface of the cylinder.
10. Smear-free transfer cylinder according to one or several of the preceding claims, wherein, when inserted in the blow holes, the air distribution elements (7) are adjustable by shaving the surface of the cylinder.
11. Smear-free transfer cylinder according to one or several of the preceding claims, wherein the air distribution elements (7) project slightly beyond the surface of the cylinder.
EP84108271A 1983-08-06 1984-07-13 Sheet guiding roll free of smears for rotary sheet printing machines Expired EP0133483B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT84108271T ATE23823T1 (en) 1983-08-06 1984-07-13 LUBRICATION-FREE TRANSFER DRUM FOR SHEET-FOOD ROTARY PRINTING MACHINES.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3328451 1983-08-06
DE19833328451 DE3328451A1 (en) 1983-08-06 1983-08-06 LUBRICATION-FREE REPLACEMENT DRUM FOR ARC TOTAL PRINTING MACHINES

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EP0133483A2 EP0133483A2 (en) 1985-02-27
EP0133483A3 EP0133483A3 (en) 1985-04-10
EP0133483B1 true EP0133483B1 (en) 1986-11-26

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EP84108272A Ceased EP0133484A1 (en) 1983-08-06 1984-07-13 Sheet guiding roll free of smears for rotary sheet printing machines
EP84108271A Expired EP0133483B1 (en) 1983-08-06 1984-07-13 Sheet guiding roll free of smears for rotary sheet printing machines

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EP84108272A Ceased EP0133484A1 (en) 1983-08-06 1984-07-13 Sheet guiding roll free of smears for rotary sheet printing machines

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US (1) US4552069A (en)
EP (2) EP0133484A1 (en)
AT (1) ATE23823T1 (en)
DE (1) DE3328451A1 (en)
DK (1) DK369584A (en)
ES (1) ES8503566A1 (en)
NO (1) NO843134L (en)

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ATE23823T1 (en) 1986-12-15
ES533963A0 (en) 1985-03-16
ES8503566A1 (en) 1985-03-16
EP0133483A3 (en) 1985-04-10
NO843134L (en) 1985-02-07
DK369584D0 (en) 1984-07-27
US4552069A (en) 1985-11-12
DK369584A (en) 1985-02-07
DE3328451A1 (en) 1985-02-21
EP0133484A1 (en) 1985-02-27
EP0133483A2 (en) 1985-02-27

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