EP2363287B1 - Impression roller - Google Patents

Impression roller Download PDF

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Publication number
EP2363287B1
EP2363287B1 EP20100015110 EP10015110A EP2363287B1 EP 2363287 B1 EP2363287 B1 EP 2363287B1 EP 20100015110 EP20100015110 EP 20100015110 EP 10015110 A EP10015110 A EP 10015110A EP 2363287 B1 EP2363287 B1 EP 2363287B1
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EP
European Patent Office
Prior art keywords
electrically conductive
contact element
axis
shaft
cylinder
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Active
Application number
EP20100015110
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German (de)
French (fr)
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EP2363287A1 (en
Inventor
Hubertus Dettke
Christoph Dettke
Christa Dettke
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Individual
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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
    • B41F13/18—Impression cylinders
    • B41F13/187—Impression cylinders for rotogravure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/001—Heliostatic printing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/64—Devices for uninterrupted current collection
    • H01R39/646—Devices for uninterrupted current collection through an electrical conductive fluid
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/02—Contact members
    • H01R13/22—Contacts for co-operating by abutting
    • H01R13/24—Contacts for co-operating by abutting resilient; resiliently-mounted
    • H01R13/2407—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means
    • H01R13/2421—Contacts for co-operating by abutting resilient; resiliently-mounted characterized by the resilient means using coil springs

Definitions

  • the invention relates to a impression roller of a rotary printing press.
  • the web-shaped or sheet-shaped printing material (e.g., paper, cardboard, or plastic film) is passed at high speed between a pressure roller and a pressure roller. Particularly high speeds are achieved in commercial printing.
  • the printing cylinder picks up ink from a paint pan in cells in its surface. The surplus is usually shaken off.
  • a high voltage is supplied to a more or less electrically conductive region of a cylindrical impression roller with rubber-elastic outer layer.
  • the electrically conductive region is e.g. around a semiconductor layer deposited on the circumference of a solid or hollow cylindrical body.
  • impression roller It is known to supply the impression roller with the electrical charge via a needle electrode (also called a "spray electrode”), which is spaced from the impression roller by an air gap. It is also known to supply the impression roller with the electrical voltage via laterally arranged electrodes, brush abrasion electrodes or via the bearings.
  • a needle electrode also called a "spray electrode”
  • laterally arranged electrodes brush abrasion electrodes or via the bearings.
  • axleed impression roller having a limited conductive coating over a steel jacket.
  • the covering is supplied with the electrical charges via the axle, a ball bearing between the axle and the steel jacket and the steel jacket.
  • a impression roller with a shaft and a limited conductive coating over the steel shell known.
  • the covering the electric charges are supplied via a arranged on the front side of the shaft ball bearing, the shaft and the steel shell.
  • the voltage supply via electrodes and brush grinding contacts is unreliable because of soiling and wear.
  • the voltage supply through ball bearings is affected by their wear, which can be accelerated by the supply of voltage through the ball bearings.
  • U1 is a impression roller of a rotary printing machine with at least one means for guiding known in which at least one electrically conductive contact element is guided on the circumference of the shaft or axis of the impression roller. At least one spring element presses the contact element against the circumference of the shaft or axis.
  • the electrically conductive shaft is fixedly connected to the cylinder and electrically connected to the electrically conductive region of the cylinder.
  • the device for guiding is arranged stationary and the electrically conductive contact element electrically connected to an electrical power supply.
  • the device for guiding is firmly connected to the cylinder and the electrically conductive contact element is electrically connected to the electrically conductive region of the cylinder.
  • the axis is arranged stationary and can be electrically connected to an electrical power supply.
  • the wear is less than in the known voltage supply via the ball bearings, because the electrically conductive contact element does not support the cylinder and is not exposed to the associated mechanical stresses.
  • the device for guiding a base body which has at least one guide for an electrically conductive contact element.
  • the main body may be formed as a circular disk with a contact element in a bore.
  • the circular disc may have an opening on the inner circumference, which has a smaller diameter than the bore, wherein the contact element with a tapered part looks out through the opening.
  • the device for supplying an electrical voltage has a stator or rotor arranged at a distance from the shaft or axis concentric with the cylinder axis, a cavity between the shaft and the stator or the axis and the rotor, an electrically conductive fluid in the cavity and a means for preventing outflow of the electrically conductive fluid from the cavity.
  • the means for guiding with the contact element and the spring element is arranged in the cavity.
  • the electrically conductive fluid can thus transmit an electrical voltage in addition to the electrically conductive contact element, in particular if the electrically conductive contact element fails.
  • the object of the invention is to provide a more reliable impression roller.
  • the contact element is seated on the peripheral region of the shaft or axis, against which it is guided, prior to the first use.
  • the contact element is pressed by the spring element in the peripheral region of the shaft.
  • the contact element and the peripheral area grind on each other.
  • material of the contact element or of the peripheral region is removed by friction wear.
  • the contact element is made of a softer material than the peripheral region of the shaft or axis, so that in particular material of the contact element is removed. The grinding takes place essentially until the counter-stop of the contact element strikes the stop of the device for guiding.
  • the abutment of the counter-stop prevents the stop further displacement of the contact element to the peripheral region of the shaft or axis.
  • Further rotation of the contact element relative to the shaft or axis results in the fact that gradually sets a minimum gap between the contact element and the peripheral region.
  • minimum deflections of the shaft and / or the device for guiding due to dimensional tolerances, vibrations, etc. may contribute.
  • the finally formed gap may have a gap width, in particular in the range of fractions of 1 ⁇ m up to a few ⁇ m. This minimal gap prevents further wear of contact element and peripheral area in the subsequent normal operation of the impression roller.
  • the minimum gap ensures the charge transfer from the contact element to the peripheral region. Due to the small distance of the contact element from the peripheral region does not lead to ignitable discharges.
  • the contact element is associated with a shaft coaxial with the cylinder.
  • This may be the shaft on which the cylinder is rotatably mounted.
  • this may be a shaft provided specifically for the device for supplying an electrical voltage.
  • the cylinder may be rotatably mounted on another shaft or ball bearings on a fixed axis.
  • the means for supplying an electric voltage may be referred to as a hollow shaft coaxial about a shaft or axis to Bearings of the cylinder can be arranged.
  • the shaft for supplying an electrical voltage can also be arranged on the end face of a shaft for supporting the cylinder.
  • the axis can also serve for rotatably supporting the cylinder.
  • the electrically conductive axis may also be present in addition to an axis or shaft for rotatably supporting the cylinder.
  • the electrically conductive axis may, for example, be a hollow axis that is concentric with the axis or shaft that rotatably supports the cylinder.
  • the electrically conductive shaft or axis is made of steel.
  • the contact element made of graphite or brass or a soft metal. The materials mentioned form favorable material pairings in which, after a short break-in phase, which is small in comparison to the entire service life of a impression roller, the contact element and the circumferential region are ground to one another.
  • the material pairings of shaft or axis and contact element are preferably selected so that the grinding-in phase is short compared to the entire operating time of the impression roller.
  • the grinding-in phase preferably lasts less than 100 operating hours, furthermore preferably less than 10 operating hours.
  • the shaft or axis is polished at least in the peripheral region, to which the contact element is directed.
  • the polished peripheral region has a low resistance and favors a low wear of the peripheral region.
  • the gap has a width in the range of 1/10 ⁇ m to 10 ⁇ m. It preferably has a width of 1 to 3 ⁇ m.
  • the device for guiding on a base body having at least one guide for at least one electrically conductive contact element having at least one guide for at least one electrically conductive contact element.
  • the main body is electrically conductive according to one embodiment.
  • the base body is a sleeve which is closed at both end sides by a wall, wherein a wall has an opening through which extends the electrically conductive contact element, which is arranged at an end disposed inside the sleeve with at least one radial Projection is provided, wherein the wall with the edge of the opening forms the stop and the radial projection forms the counter-stop.
  • the spring element is a pressure spring element which bears against the one end of the contact element and on the side of the other end wall of the main body arranged in the interior of the sleeve.
  • the sleeve has on the circumference means for securing the sleeve in a bore of a holder.
  • the means for fixing on one or more annularly on the circumference of the sleeve arranged beads or projections, which are pressed in a bore of the holder.
  • the means for securing the sleeve is according to another embodiment, an external thread which can be screwed into a threaded bore of a holder.
  • the at least one spring element is a helical spring.
  • the at least one guide is aligned radially to the shaft or axis.
  • the electrically conductive contact element is a contact pin.
  • the contact pin is crowned at the end, which faces the shaft or axis.
  • a plurality of electrically conductive contact elements occupy different angular positions on the shaft or axis.
  • the resistance of the supply of the electrical voltage is reduced.
  • the device for supplying an electrical voltage has, in addition to the contact element, further means for supplying an electrical voltage.
  • these further means comprise a stator or rotor arranged concentrically with the cylinder axis at a distance from the shaft or axis, a cavity between the shaft and the stator or the axis and the rotor, in which at least one device for guiding at least one contact element is arranged with the at least one contact element and the at least one spring element, an electrically conductive fluid in the cavity and at least one Means for preventing outflow of the electrically conductive fluid from the cavity.
  • the means for preventing the outflow is at least one shaft seal (eg "Simmerring") and / or at least one stuffing box seal.
  • the electrically conductive fluid fills the gap between the contact element and the peripheral region, whereby the contact resistance is greatly reduced.
  • the arrangement shields the live areas from the environment.
  • the stator has a stator electrode or the rotor has a rotor electrode, wherein the stator electrode is connectable to the electrical power supply or the rotor electrode is electrically connected to the electrically conductive region.
  • the means for guiding with its electrically conductive body is externally connected to the stator of the stator or the rotor electrode of the rotor.
  • the means for guiding is a holder, in which a base body is held, which comprises the means for guiding with the contact element.
  • the holder has, for example, the shape of an annular disk.
  • Fig. 1 has a impression roller 1 a cylinder 2, which has a metallic cylinder core 3 and a partially conductive sleeve sleeve 4.1 and a rubber-elastic, electrically semiconducting layer 4 on the outer circumference.
  • the layer 4 consists for example of rubber with embedded carbon black, carbon fiber or graphite particles.
  • the impression roller 1 has a fixed to the cylinder core 3 shaft 5 made of steel, which is mounted on both sides in pivot bearings in the form of radial ball bearings 6.
  • the ball bearings 6 are supported on the one hand on a radial shoulder of the shaft 5 and on the other hand secured by a pushed onto the shaft sleeve body 7 against axial displacement.
  • the ball bearings 6 are mounted outside in bearing shells 8 made of electrically insulating material, which in turn are held in a machine frame, not shown.
  • the shaft 5 has a central bore 9 for supplying compressed air for the purpose of replacing a sleeve sleeve 4.1 on the jacket of the impression.
  • a rotary feedthrough 10 for supplying compressed air is inserted into the bore 9 on the end face of the shaft 5. Further, a rotor 11 is screwed with a hollow cylindrical portion 12 and a flange 13 at one end by means of screws 14 on the end face of the shaft 5. The flange 13 secures the sleeve body 7 against axial displacement.
  • the hollow cylindrical section surrounds the rotary leadthrough 10.
  • the hollow cylindrical portion 12 of the rotor 11 is surrounded by a substantially circular cylindrical stator 15.
  • the stator 15 is made of an electrically insulating material. It is fixed by screws 16 on a machine frame fixed mounting plate 17.
  • a metallic annular disc 18 is used, which is fixed on the inner circumference of the stator 15 by means not shown.
  • the stator and the annular disc 18 have mutually aligned insertion holes into which a connector 19 is inserted with a Maiszapfcn, not shown.
  • the connector 19 has a from the plane of Fig. 1 pivoted plug-in axis.
  • a shaft sealing ring 20, 21 is arranged on both sides of the annular disc 18.
  • Each shaft sealing ring 20, 21 has a rigid, L-shaped base 22, 23, wherein on the leg perpendicular to the shaft 24, 25 of the base an elastic sealing lip 26, 27 in acute-angled alignment with this leg 24, 25 is fixed.
  • the sealing lips 26, 27 of the two shaft sealing rings 20, 31 are inclined towards each other.
  • the sealing lips 26, 27 of the shaft seals are slidably mounted on the hollow cylindrical portion 12 of the rotor 11.
  • the annular disc 18 has a radial bore 28 in which a resilient contact pin 29 is seated.
  • the resilient contact pin has a main body in the form of a sleeve 30 which is closed at both ends by a wall 31, 32.
  • the wall 31 has an opening 33 through which extends an electrically conductive contact element 34 which is pin-shaped.
  • the electrically conductive contact element 34 is provided at an inner end with a radial projection 35 in the form of a flange.
  • the wall 31 forms with the edge of the opening 33 a stop 36 and the flange 35 with the top of a counter-stop 37th
  • the contact pin 29 has a spherical end 38 outside of the sleeve 30.
  • the sleeve 30 has on the circumference a circumferential, protruding bead 39th
  • a compression spring in the form of a coil spring 40 is arranged, which is supported at one end on the end face of the contact element 34 and the other end on the inside of the opposite wall 32.
  • the bead 39 has a seat in the radial bore of the washer.
  • the resilient contact pin is adjusted so that the contact pin rests with the crowned end 38 on the hollow cylindrical portion of the rotor.
  • the sleeve 30, the contact element 34 and the coil spring 40 are made of an electrically conductive material.
  • the cavity between the annular disc 18 and the two shaft sealing rings 20, 21 is filled with an electrically conductive fluid.
  • an electrical voltage is supplied to the annular disc 18 made of electrically conductive material via the connector 19. From the annular disc 18, the voltage passes through the resilient contact pin 29 to the hollow cylindrical portion 12 of the rotor 11.
  • the contact pin 34 grinds in after a short period of operation, so that its spherical end has a flattening 41. This is in Fig. 3 and 4b shown. Between the flattening 41 and the hollow cylindrical portion 12 there is a gap 42, which in the example has a width of 1 to 3 ⁇ m.
  • the electrical voltage passes via the electrically conductive fluid from the contact pin 34 on the hollow cylindrical portion 12. This voltage transmission takes place in particular in the region of the gap 42nd

Description

Die Erfindung bezieht sich auf einen Presseur einer Rotationsdruckmaschine.The invention relates to a impression roller of a rotary printing press.

Beim Rotationsdruck wird das bahnförmige oder bogenförmige Druckmaterial (z.B. Papier, Karton oder Kunststofffolie) mit hoher Geschwindigkeit zwischen einer Druckwalze und einem Presseur hindurchgeführt Besonders hohe Geschwindigkeiten werden beim Illustrationsdruck erreicht. Der Druckzylinder nimmt in Näpfchen in seiner Oberfläche Farbe aus einer Farbwanne auf. Der Überschuss wird in der Regel abgerackelt. Zur möglichst weitergehenden Übertragung der Farbe aus den Näpfchen des elektrisch an Masse liegenden Druckzylinders auf das Druckmaterial wird einem mehr oder weniger elektrisch leitfähigen Bereich eines zylindrischen Presseurs mit gummielastischer Außenschicht eine Hochspannung zugeführt. Bei dem elektrisch leitfähigen Bereich handelt es sich z.B. um eine Halbleiterschicht, die auf den Umfang eines massiven oder hohlen Zylinderkörpers aufgebracht ist. Hierdurch bildet sich zwischen dem elektrisch leitfähigen Bereich und dem Druckzylinder ein elektrisches Feld aus, das auf die Farbe in den Näpfchen eine Kraft ausübt, die den Übergang der Farbe auf das Druckmaterial intensiviert und die Druckqualität steigert.In rotary printing, the web-shaped or sheet-shaped printing material (e.g., paper, cardboard, or plastic film) is passed at high speed between a pressure roller and a pressure roller. Particularly high speeds are achieved in commercial printing. The printing cylinder picks up ink from a paint pan in cells in its surface. The surplus is usually shaken off. For the further possible transfer of the ink from the cups of the printing cylinder lying electrically to ground on the printing material, a high voltage is supplied to a more or less electrically conductive region of a cylindrical impression roller with rubber-elastic outer layer. The electrically conductive region is e.g. around a semiconductor layer deposited on the circumference of a solid or hollow cylindrical body. As a result, an electric field forms between the electrically conductive region and the printing cylinder, which exerts a force on the ink in the cells, which intensifies the transition of the ink to the printing material and increases the print quality.

Bekannt ist, dem Presseur die elektrische Ladung über eine Nadelelektrode (auch "Sprühelektrode" genannt) zuzuführen, die durch einen Luftspalt vom Presseur beabstandet ist. Ferner ist bekannt, dem Presseur die elektrische Spannung über seitlich angeordnete Elektroden, Bürstenschleifelektroden oder über die Lager zuzuführen. Aus der EP 0 556 463 B1 ist ein mit einer Achse versehener Presseur bekannt, der einen begrenzt leitfähigen Belag über einem Stahlmantel aufweist. Dem Belag werden die elektrischen Ladungen über die Achse, ein Kugellager zwischen Achse und Stahlmantel und den Stahlmantel zugeführt. Ferner ist aus dieser Druckschrift ein Presseur mit einer Welle und einem begrenzt leitfähigen Belag über dem Stahlmantel bekannt. Dem Belag werden die elektrischen Ladungen über ein an der Stirnseite der Welle angeordnetes Kugellager, die Welle und den Stahlmantel zugeführt.It is known to supply the impression roller with the electrical charge via a needle electrode (also called a "spray electrode"), which is spaced from the impression roller by an air gap. It is also known to supply the impression roller with the electrical voltage via laterally arranged electrodes, brush abrasion electrodes or via the bearings. From the EP 0 556 463 B1 For example, there is known an axleed impression roller having a limited conductive coating over a steel jacket. The covering is supplied with the electrical charges via the axle, a ball bearing between the axle and the steel jacket and the steel jacket. Furthermore, from this Publication a impression roller with a shaft and a limited conductive coating over the steel shell known. The covering the electric charges are supplied via a arranged on the front side of the shaft ball bearing, the shaft and the steel shell.

Die Spannungszufuhr über Elektroden und Bürstenschleifkontakte ist wegen Verschmutzung und Abnutzung unzuverlässig. Die Spannungszufuhr über Kugellager wird durch deren Abnutzung beeinträchtigt, die durch die Zufuhr der Spannung über die Kugellager beschleunigt werden kann.The voltage supply via electrodes and brush grinding contacts is unreliable because of soiling and wear. The voltage supply through ball bearings is affected by their wear, which can be accelerated by the supply of voltage through the ball bearings.

Aus der DE 20 2007 002 726 U1 ist ein Presseur einer Rotationsdruckmaschine mit mindestens einer Einrichtung zum Führen bekannt, in der mindestens ein elektrisch leitfähiges Kontaktelement an den Umfang der Welle oder Achse des Presseurs geführt ist. Mindestens ein Federelement drückt das Kontaktelement gegen den Umfang der Welle oder Achse. Bei einer Variante ist die elektrisch leitfähige Welle fest mit dem Zylinder verbunden und elektrisch mit dem elektrisch leitfähigen Bereich des Zylinders verbunden. Ferner ist die Einrichtung zum Führen ortsfest angeordnet und das elektrisch leitfähige Kontaktelement elektrisch mit einer elektrischen Spannungsversorgung verbindbar. Bei einer anderen Variante ist die Einrichtung zum Führen fest mit dem Zylinder verbunden und das elektrisch leitfähige Kontaktelement elektrisch mit dem elektrisch leitfähigen Bereich des Zylinders verbunden. Die Achse ist ortsfest angeordnet und elektrisch mit einer elektrischen Spannungsversorgung verbindbar. Bei den Presseuren aus der DE 20 2007 002 726 U1 ist der Verschleiß geringer als bei der bekannten Spannungszufuhr über die Kugellager, weil das elektrisch leitfähige Kontaktelement den Zylinder nicht lagert und nicht den damit einhergehenden mechanischen Belastungen ausgesetzt ist.From the DE 20 2007 002 726 U1 is a impression roller of a rotary printing machine with at least one means for guiding known in which at least one electrically conductive contact element is guided on the circumference of the shaft or axis of the impression roller. At least one spring element presses the contact element against the circumference of the shaft or axis. In one variant, the electrically conductive shaft is fixedly connected to the cylinder and electrically connected to the electrically conductive region of the cylinder. Furthermore, the device for guiding is arranged stationary and the electrically conductive contact element electrically connected to an electrical power supply. In another variant, the device for guiding is firmly connected to the cylinder and the electrically conductive contact element is electrically connected to the electrically conductive region of the cylinder. The axis is arranged stationary and can be electrically connected to an electrical power supply. In the impressionists from the DE 20 2007 002 726 U1 the wear is less than in the known voltage supply via the ball bearings, because the electrically conductive contact element does not support the cylinder and is not exposed to the associated mechanical stresses.

Gemäß einer Ausgestaltung weist die Einrichtung zum Führen einen Grundkörper auf, der mindestens eine Führung für ein elektrisch leitfähiges Kontaktelement hat. Der Grundkörper kann als Kreisscheibe mit einem Kontaktelement in einer Bohrung ausgebildet sein. Die Kreisscheibe kann eine Öffnung am Innenumfang aufweisen, die einen kleineren Durchmesser als die Bohrung aufweist, wobei das Kontaktelement mit einem sich verjüngenden Teil durch die Öffnung herausschaut. Hierdurch wird die Montage des Grundkörpers mit dem eingesetzten Kontaktelement erleichtert.According to one embodiment, the device for guiding a base body, which has at least one guide for an electrically conductive contact element. The main body may be formed as a circular disk with a contact element in a bore. The circular disc may have an opening on the inner circumference, which has a smaller diameter than the bore, wherein the contact element with a tapered part looks out through the opening. As a result, the assembly of the body is facilitated with the contact element used.

Gemäß einer Ausgestaltung weist die Einrichtung zum Zuführen einer elektrischen Spannung einen mit Abstand von der Welle oder Achse konzentrisch zur Zylinderachse angeordneten Stator oder Rotor, einen Hohlraum zwischen der Welle und dem Stator oder der Achse und dem Rotor, ein elektrisch leitfähiges Fluid in dem Hohlraum und ein Mittel zum Verhindern eines Ausströmens des elektrisch leitfähigen Fluids aus dem Hohlraum auf. In dem Hohlraum ist die Einrichtung zum Führen mit dem Kontaktelement und dem Federelement angeordnet. Das elektrisch leitfähige Fluid kann somit zusätzlich zum elektrisch leitfähigen Kontaktelement eine elektrische Spannung übertragen, insbesondere wenn das elektrisch leitfähige Kontaktelement ausfällt.According to one embodiment, the device for supplying an electrical voltage has a stator or rotor arranged at a distance from the shaft or axis concentric with the cylinder axis, a cavity between the shaft and the stator or the axis and the rotor, an electrically conductive fluid in the cavity and a means for preventing outflow of the electrically conductive fluid from the cavity. In the cavity, the means for guiding with the contact element and the spring element is arranged. The electrically conductive fluid can thus transmit an electrical voltage in addition to the electrically conductive contact element, in particular if the electrically conductive contact element fails.

Davon ausgehend liegt der Erfindung die Aufgabe zugrunde, einen zuverlässigeren Presseur zu schaffen.Based on this, the object of the invention is to provide a more reliable impression roller.

Die Aufgabe wird durch einen Presseur mit den Merkmalen des Anspruches 1 gelöst.The object is achieved by a impression roller with the features of claim 1.

Der erfindungsgemäße Presseur einer Rotationsdruckmaschine hat

  • einen Zylinder, der zumindest in einem Bereich elektrisch leitfähig ist,
  • Einrichtungen zum drehbaren Lagern des Zylinders um seine Zylinderachse und
  • mindestens eine Einrichtung zum Zuführen einer elektrischen Spannung an den elektrisch leitfähigen Bereich,
  • die eine elektrisch leitfähige, zum Zylinder koaxiale, fest mit dem Zylinder verbundene und elektrisch mit dem elektrisch leitfähigen Bereich des Zylinders verbundene Welle,
  • mindestens eine ortsfeste Einrichtung zum Führen mindestens eines elektrisch leitfähigen Kontaktelementes an den Umfang der Welle,
  • mindestens ein elektrisch mit einer elektrischen Spannungsversorgung verbindbares, elektrisch leitfähiges Kontaktelement in der Einrichtung zum Führen,
  • mindestens ein das elektrisch leitfähige Kontaktelement gegen den Umfang der Welle drückendes Federelement, wobei das Kontaktelement und der Umfangsbereich der Welle, zu dem das Kontaktelement geführt ist, aufeinander eingeschliffen sind, und
  • einen Anschlag der Einrichtung zum Führen und einen Gegenanschlag des Kontaktelementes, die die Verlagerung des Kontaktelementes in Wirkrichtung des Federelementes begrenzen, aufweist,
    dadurch gekennzeichnet, dass
  • der Anschlag auf dem Gegenanschlag aufsitzt und
  • ein Spalt zwischen Kontaktelement und Welle vorhanden ist.
The impression roller according to the invention has a rotary printing press
  • a cylinder which is electrically conductive at least in one area,
  • Means for rotatably supporting the cylinder about its cylinder axis and
  • at least one device for supplying an electrical voltage to the electrically conductive region,
  • the one electrically conductive, coaxial with the cylinder, firmly connected to the cylinder and electrically connected to the electrically conductive portion of the cylinder shaft,
  • at least one stationary device for guiding at least one electrically conductive contact element to the circumference of the shaft,
  • at least one electrically conductive contact element that can be electrically connected to an electrical power supply in the device for guiding,
  • at least one spring element pressing the electrically conductive contact element against the circumference of the shaft, wherein the contact element and the peripheral region of the shaft to which the contact element is guided are ground to one another, and
  • a stop of the device for guiding and a counter-stop of the contact element, which limit the displacement of the contact element in the direction of action of the spring element has,
    characterized in that
  • the stop is seated on the counter stop and
  • a gap between contact element and shaft is present.

Ferner wird die Aufgabe durch einen Presseur mit den Merkmalen von Anspruch 2 gelöst.Furthermore, the object is achieved by a impression roller with the features of claim 2.

Der erfindungsgemäße Presseur einer Rotationsdruckmaschine hat

  • einen Zylinder, der zumindest in einem Bereich elektrisch leitfähig ist,
  • Einrichtungen zum drehbaren Lagern des Zylinders um seine Zylinderachse und
  • mindestens eine Einrichtung zum Zuführen einer elektrischen Spannung an den elektrisch leitfähigen Bereich,
  • die eine elektrisch leitfähige, zum Zylinder koaxiale, ortsfeste und elektrisch mit einer elektrischen Spannungsversorgung verbindbare Achse,
  • mindestens eine fest mit dem Zylinder verbundene Einrichtung zum Führen mindestens eines elektrisch leitfähigen Kontaktelementes an den Umfang der Achse,
  • mindestens ein elektrisch leitfähiges, mit dem elektrisch leitfähigen Bereich des Zylinders verbundenes Kontaktelement in der Einrichtung zum Führen,
  • mindestens ein das elektrisch leitfähige Kontaktelement gegen den Umfang der Achse drückendes Federelement, wobei das Kontaktelement und der Umfangsbereich der Achse, gegen den das Kontaktelement geführt ist, aufeinander eingeschliffen sind, und
  • einen Anschlag der Einrichtung zum Führen und einen Gegenanschlag des Kontaktelementes, die die Verlagerung des Kontaktelementes in Wirkrichtung des Federelementes begrenzen, aufweist,
  • dadurch gekennzeichnet, dass
  • der Anschlag auf dem Gegenanschlag aufsitzt und
  • ein Spalt zwischen Kontaktelement und Achse vorhanden ist.
The impression roller according to the invention has a rotary printing press
  • a cylinder which is electrically conductive at least in one area,
  • Means for rotatably supporting the cylinder about its cylinder axis and
  • at least one device for supplying an electrical voltage to the electrically conductive region,
  • the one electrically conductive, coaxial to the cylinder, fixed and electrically connectable to an electrical power supply axis,
  • at least one device fixedly connected to the cylinder for guiding at least one electrically conductive contact element to the circumference of the axis,
  • at least one electrically conductive contact element connected to the electrically conductive region of the cylinder in the device for guiding,
  • at least one spring element pressing the electrically conductive contact element against the circumference of the axis, wherein the contact element and the peripheral region of the axis against which the contact element is guided are ground to one another, and
  • a stop of the device for guiding and a counter-stop of the contact element, which limit the displacement of the contact element in the direction of action of the spring element has,
  • characterized in that
  • the stop is seated on the counter stop and
  • there is a gap between contact element and axis.

Bei den beiden Varianten des erfindungsgemäßen Presseurs sitzt vor erster Inbetriebnahme das Kontaktelement auf dem Umfangsbereich der Welle oder Achse auf, gegen den es geführt ist. Hierbei wird das Kontaktelement durch das Federelement in den Umfangsbereich der Welle gedrückt. Nach erster Inbetriebnahme schleifen sich das Kontaktelement und der Umfangsbereich aufeinander ein. Hierbei wird durch Reibvcrschleiß Material des Kontaktelementes bzw. des Umfangbereiches abgetragen. Bevorzugt ist das Kontaktelement aus einem weicheren Material als der Umfangsbereich der Welle oder Achse, so dass vor allem Material des Kontaktelementes abgetragen wird. Das Einschleifen erfolgt im Wesentlichen, bis der Gegenanschlag des Kontaktelementes auf den Anschlag der Einrichtung zum Führen trifft. Dann verhindert die Anlage des Gegenanschlages am Anschlag ein weiteres Verlagern des Kontaktelementes zum Umfangsbereich der Welle oder Achse hin. Weiteres Drehen des Kontaktelementes relativ zur Welle oder Achse führt dazu, dass sich allmählich ein minimaler Spalt zwischen dem Kontaktelement und dem Umfangsbereich einstellt. Zur Ausbildung dieses Spaltes können minimale Auslenkungen der Welle und/oder der Einrichtung zum Führen aufgrund von Maßtoleranzen, Vibrationen etc. beitragen. Der schließlich ausgebildete Spalt kann eine Spaltweite insbesondere im Bereich von Bruchteilen von 1 µm bis hin zu einigen µm aufweisen. Durch diesen minimalen Spalt wird im nachfolgenden normalen Betrieb des Presseurs eine weitere Abnutzung von Kontaktelement und Umfangsbereich verhindert. Andererseits stellt der minimale Spalt den Ladungsübergang von dem Kontaktelement zum Umfangsbereich sicher. Aufgrund des geringen Abstandes des Kontaktelementes vom Umfangsbereich kommt es nicht zu zündfähigen Entladungen.In the case of the two variants of the impression roller according to the invention, the contact element is seated on the peripheral region of the shaft or axis, against which it is guided, prior to the first use. In this case, the contact element is pressed by the spring element in the peripheral region of the shaft. After first Commissioning, the contact element and the peripheral area grind on each other. In this case, material of the contact element or of the peripheral region is removed by friction wear. Preferably, the contact element is made of a softer material than the peripheral region of the shaft or axis, so that in particular material of the contact element is removed. The grinding takes place essentially until the counter-stop of the contact element strikes the stop of the device for guiding. Then the abutment of the counter-stop prevents the stop further displacement of the contact element to the peripheral region of the shaft or axis. Further rotation of the contact element relative to the shaft or axis results in the fact that gradually sets a minimum gap between the contact element and the peripheral region. To form this gap, minimum deflections of the shaft and / or the device for guiding due to dimensional tolerances, vibrations, etc. may contribute. The finally formed gap may have a gap width, in particular in the range of fractions of 1 μm up to a few μm. This minimal gap prevents further wear of contact element and peripheral area in the subsequent normal operation of the impression roller. On the other hand, the minimum gap ensures the charge transfer from the contact element to the peripheral region. Due to the small distance of the contact element from the peripheral region does not lead to ignitable discharges.

Bei der ersten Erfindungsvariante ist das Kontaktelement einer zum Zylinder koaxialen Welle zugeordnet. Hierbei kann es sich um die Welle handeln, auf der der Zylinder drehbar gelagert ist. Ferner kann es sich hierbei um eine speziell für die Einrichtung zum Zuführen einer elektrischen Spannung vorgesehene Welle handeln. Der Zylinder kann auf einer weiteren Welle drehbar gelagert sein oder über Kugellager auf einer ortsfesten Achse. Die Einrichtung zum Zuführen einer elektrischen Spannung kann als hohle Welle koaxial um eine Welle oder Achse zum Lagern des Zylinders angeordnet sein. Die Welle zum Zuführen einer elektrischen Spannung kann aber auch an der Stirnseite einer Welle zum Lagern des Zylinders angeordnet sein.In the first variant of the invention, the contact element is associated with a shaft coaxial with the cylinder. This may be the shaft on which the cylinder is rotatably mounted. Furthermore, this may be a shaft provided specifically for the device for supplying an electrical voltage. The cylinder may be rotatably mounted on another shaft or ball bearings on a fixed axis. The means for supplying an electric voltage may be referred to as a hollow shaft coaxial about a shaft or axis to Bearings of the cylinder can be arranged. However, the shaft for supplying an electrical voltage can also be arranged on the end face of a shaft for supporting the cylinder.

Bei der Erfindungsvariante, bei der die Einrichtung zum Zuführen einer elektrischen Spannung eine zum Zylinder koaxiale Achse aufweist, kann die Achse zugleich zum drehbaren Lagern des Zylinders dienen. Die elektrisch leitfähige Achse kann aber auch zusätzlich zu einer Achse oder Welle zum drehbaren Lagern des Zylinders vorhanden sein. Die elektrisch leitfähige Achse kann beispielsweise eine hohle Achse sein, die konzentrisch zur Achse oder Welle angeordnet ist, die den Zylinder drehbar lagert.In the variant of the invention in which the means for supplying an electrical voltage has an axis coaxial to the cylinder, the axis can also serve for rotatably supporting the cylinder. The electrically conductive axis may also be present in addition to an axis or shaft for rotatably supporting the cylinder. The electrically conductive axis may, for example, be a hollow axis that is concentric with the axis or shaft that rotatably supports the cylinder.

Gemäß einer Ausgestaltung besteht die elektrisch leitfähige Welle oder Achse aus Stahl. Gemäß einer weiteren Ausgestaltung besteht das Kontaktelement aus Graphit oder Messing oder einem Weichmetall. Die genannten Materialien bilden günstige Materialpaarungen, bei denen sich nach einer kurzen Einlaufphase, die gering im Vergleich zur gesamten Lebensdauer eines Presseurs ist, das Kontaktelement und der Umfangsbereich aufeinander eingeschliffen sind.According to one embodiment, the electrically conductive shaft or axis is made of steel. According to a further embodiment, the contact element made of graphite or brass or a soft metal. The materials mentioned form favorable material pairings in which, after a short break-in phase, which is small in comparison to the entire service life of a impression roller, the contact element and the circumferential region are ground to one another.

Die Materialpaarungen von Welle oder Achse und Kontaktelement sind bevorzugt so gewählt, dass die Einschleifphase im Vergleich zur gesamten Betriebsdauer des Presseurs kurz ist. Bevorzugt dauert die Einschleifphase weniger als 100 Betriebsstunden, weiterhin bevorzugt weniger als 10 Betriebsstunden.The material pairings of shaft or axis and contact element are preferably selected so that the grinding-in phase is short compared to the entire operating time of the impression roller. The grinding-in phase preferably lasts less than 100 operating hours, furthermore preferably less than 10 operating hours.

Gemäß einer weiteren Ausgestaltung ist die Welle oder Achse zumindest in dem Umfangsbereich, auf den das Kontaktelement gerichtet ist, poliert. Der polierte Umfangsbereich hat einen geringen Widerstand und begünstigt eine geringe Abnutzung des Umfangsbereiches.According to a further embodiment, the shaft or axis is polished at least in the peripheral region, to which the contact element is directed. The polished peripheral region has a low resistance and favors a low wear of the peripheral region.

Gemäß einer weiteren Ausgestaltung weist der Spalt eine Weite im Bereich von 1/10 µm bis 10 µm auf. Bevorzugt weist er eine Weite von 1 bis 3 µm auf.According to a further embodiment, the gap has a width in the range of 1/10 μm to 10 μm. It preferably has a width of 1 to 3 μm.

Gemäß einer Ausgestaltung weist die Einrichtung zum Führen einen Grundkörper auf, der mindestens eine Führung für mindestens ein elektrisch leitfähiges Kontaktelement hat. Der Grundkörper ist gemäß einer Ausgestaltung elektrisch leitfähig.According to one embodiment, the device for guiding on a base body having at least one guide for at least one electrically conductive contact element. The main body is electrically conductive according to one embodiment.

Gemäß einer weiteren Ausgestaltung ist der Grundkörper eine Hülse, die an beiden Stirnseiten durch eine Wand geschlossen ist, wobei eine Wand eine Öffnung aufweist, durch die hindurch sich das elektrisch leitfähige Kontaktelement erstreckt, das an einem im Inneren der Hülse angeordneten Ende mit mindestens einem radialen Vorsprung versehen ist, wobei die Wand mit dem Rand der Öffnung den Anschlag und der radiale Vorsprung den Gegenanschlag bildet. Gemäß einer weiteren Ausgestaltung ist das Federelement ein an dem einen Ende des Kontaktelementes und an der im Inneren der Hülse angeordneten Seite der anderen stirnseitigen Wand des Grundkörpers anliegendes Druckfederelement. Die solchermaßen ausgebildete Einrichtung zum Führen kann leicht als komplettes Bauteil montiert und justiert werden.According to a further embodiment, the base body is a sleeve which is closed at both end sides by a wall, wherein a wall has an opening through which extends the electrically conductive contact element, which is arranged at an end disposed inside the sleeve with at least one radial Projection is provided, wherein the wall with the edge of the opening forms the stop and the radial projection forms the counter-stop. According to a further embodiment, the spring element is a pressure spring element which bears against the one end of the contact element and on the side of the other end wall of the main body arranged in the interior of the sleeve. The thus formed means for guiding can be easily mounted and adjusted as a complete component.

Gemäß einer weiteren Ausgestaltung hat die Hülse am Umfang Mittel zum Befestigen der Hülse in einer Bohrung eines Halters. Gemäß einer Ausgestaltung weisen die Mittel zum Befestigen einen oder mehrere ringförmig am Umfang der Hülse angeordnete Wulste oder Vorsprünge auf, die in einer Bohrung des Halters eingepresst sind. Das Mittel zum Befestigen der Hülse ist gemäß einer anderen Ausgestaltung ein Außengewinde, das in eine Gewindebohrung eines Halters einschraubbar ist.According to a further embodiment, the sleeve has on the circumference means for securing the sleeve in a bore of a holder. According to one embodiment, the means for fixing on one or more annularly on the circumference of the sleeve arranged beads or projections, which are pressed in a bore of the holder. The means for securing the sleeve is according to another embodiment, an external thread which can be screwed into a threaded bore of a holder.

Gemäß einer weiteren Ausgestaltung ist das mindestens eine Federelement eine Schraubenfeder.According to a further embodiment, the at least one spring element is a helical spring.

Gemäß einer weiteren Ausgestaltung ist die mindestens eine Führung radial zur Welle oder Achse ausgerichtet.According to a further embodiment, the at least one guide is aligned radially to the shaft or axis.

Gemäß einer bevorzugten Ausgestaltung ist das elektrisch leitfähige Kontaktelement ein Kontaktstift. Gemäß einer weiteren Ausgestaltung ist der Kontaktstift an dem Ende ballig, das der Welle oder Achse zugewandt ist.According to a preferred embodiment, the electrically conductive contact element is a contact pin. According to a further embodiment, the contact pin is crowned at the end, which faces the shaft or axis.

Gemäß einer weiteren Ausgestaltung nehmen mehrere elektrisch leitfähige Kontaktelemente verschiedene Winkellagen an der Welle oder Achse ein. Durch mehrere elektrisch leitfähige Kontaktelemente, die über den Umfang der Welle oder Achse verteilt sind, wird der Widerstand der Zuführung der elektrischen Spannung verringert. Dies gilt auch für eine weitere Ausgestaltung, gemäß der mehrere elektrisch leitfähige Kontaktelemente verschiedene Positionen in Axialrichtung der Welle oder Achse einnehmen.According to a further embodiment, a plurality of electrically conductive contact elements occupy different angular positions on the shaft or axis. By several electrically conductive contact elements, which are distributed over the circumference of the shaft or axis, the resistance of the supply of the electrical voltage is reduced. This also applies to a further embodiment, according to which occupy a plurality of electrically conductive contact elements different positions in the axial direction of the shaft or axis.

Gemäß einer weiteren Ausgestaltung weist die Einrichtung zum Zuführen einer elektrischen Spannung zusätzlich zu dem Kontaktelement weitere Mittel zum Zuführen einer elektrischen Spannung auf. Diese weiteren Mittel weisen gemäß einer bevorzugten Ausgestaltung einen mit Abstand von der Welle oder Achse konzentrisch zur Zylinderachse angeordneten Stator oder Rotor, einen Hohlraum zwischen der Welle und dem Stator oder der Achse und dem Rotor, in dem mindestens eine Einrichtung zum Führen von mindestens einem Kontaktelement mit dem mindestens einen Kontaktelement und dem mindestens einen Federelement angeordnet ist, ein elektrisch leitfähiges Fluid in dem Hohlraum und mindestens ein Mittel zum Verhindern eines Ausströmens des elektrisch leitfähigen Fluids aus dem Hohlraum auf. Bevorzugt handelt es sich bei dem Mittel zum Verhindern des Ausströmens um mindestens einen Wellendichtring (z.B. "Simmerring") und/oder um mindestens eine Stopfbuchsdichtung. Das elektrisch leitfähige Fluid füllt insbesondere den Spalt zwischen dem Kontaktelement und dem Umfangsbereich auf, wodurch der Übergangswiderstand stark herabgesetzt wird. Außerdem schirmt die Anordnung die spannungsführenden Bereiche gegenüber der Umgebung ab.In accordance with a further embodiment, the device for supplying an electrical voltage has, in addition to the contact element, further means for supplying an electrical voltage. According to a preferred embodiment, these further means comprise a stator or rotor arranged concentrically with the cylinder axis at a distance from the shaft or axis, a cavity between the shaft and the stator or the axis and the rotor, in which at least one device for guiding at least one contact element is arranged with the at least one contact element and the at least one spring element, an electrically conductive fluid in the cavity and at least one Means for preventing outflow of the electrically conductive fluid from the cavity. Preferably, the means for preventing the outflow is at least one shaft seal (eg "Simmerring") and / or at least one stuffing box seal. In particular, the electrically conductive fluid fills the gap between the contact element and the peripheral region, whereby the contact resistance is greatly reduced. In addition, the arrangement shields the live areas from the environment.

Gemäß einer weiteren Ausgestaltung weist der Stator eine Statorelektrode oder der Rotor eine Rotorelektrode auf, wobei die Statorelektrode mit der elektrischen Spannungsversorgung verbindbar ist oder die Rotorelektrode elektrisch mit dem elektrisch leitfähigen Bereich verbunden ist.According to a further embodiment, the stator has a stator electrode or the rotor has a rotor electrode, wherein the stator electrode is connectable to the electrical power supply or the rotor electrode is electrically connected to the electrically conductive region.

Gemäß einer weiteren Ausgestaltung ist die Einrichtung zum Führen mit ihrem elektrisch leitfähigen Grundkörper außen mit der Statorelektrode des Stators oder der Rotorelektrode des Rotors verbunden.According to a further embodiment, the means for guiding with its electrically conductive body is externally connected to the stator of the stator or the rotor electrode of the rotor.

Bevorzugt ist die Einrichtung zum Führen ein Halter, in dem ein Grundkörper gehalten ist, der die Einrichtung zum Führen mit dem Kontaktelement umfasst. Der Halter hat beispielsweise die Form einer Ringscheibe.Preferably, the means for guiding is a holder, in which a base body is held, which comprises the means for guiding with the contact element. The holder has, for example, the shape of an annular disk.

Die Erfindung wird nachfolgend anhand der anliegenden Zeichnungen eines Ausführungsbeispieles näher erläutert. In den Zeichnungen zeigen:

Fig. 1
einen Presseur mit einer Welle und einer Einrichtung zum Zuführen einer elektrischen Spannung mit einem an der Stirnseite der Welle befestigten Rotor, einem diesen umgebenden Stator, einem im Stator gehaltenen, federnden Kontaktstift, auf dem Rotor aufsitzenden Wellendichtringen und einem elektrisch leitfähigen Fluid im teilweisen Längsschnitt;
Fig. 2
vergrößertes Detail II von Fig. 1;
Fig. 3
vergößertes Detail III von Fig. 2;
Fig. 4a und b
der federnde Kontaktstift vor dem Einschleifen (Fig. 4a) und nach dem Einschleifen (Fig. 4b) jeweils in einer vergrößerten Detailansicht.
The invention will be explained in more detail with reference to the accompanying drawings of an embodiment. In the drawings show:
Fig. 1
a Pressur with a shaft and means for supplying an electrical voltage with a rotor attached to the end face of the shaft, a stator surrounding it, a stator held in the resilient contact pin, seated on the rotor Shaft seals and an electrically conductive fluid in partial longitudinal section;
Fig. 2
enlarged detail II of Fig. 1 ;
Fig. 3
enlarged detail III of Fig. 2 ;
Fig. 4a and b
the resilient contact pin before grinding ( Fig. 4a ) and after grinding ( Fig. 4b ) in each case in an enlarged detail view.

Gemäß Fig. 1 hat ein Presseur 1 einen Zylinder 2, der einen metallischen Zylinderkern 3 und eine partiell leitfähige Sleeve-Hülse 4.1 und eine gummielastische, elektrisch halbleitende Schicht 4 am Außenumfang aufweist. Die Schicht 4 besteht beispielsweise aus Gummi mit eingelagerten Ruß-, Kohlefaser- oder Graphitpartikeln. Ferner hat der Presseur 1 eine fest mit dem Zylinderkern 3 verbundene Welle 5 aus Stahl, die beidseitig in Drehlagern in Form von Radialkugellagern 6 gelagert ist. Die Kugellager 6 sind innen einerseits an einer Radialschulter der Welle 5 abgestützt und andererseits durch einen auf die Welle aufgeschobenen Hülsenkörper 7 gegen axiale Verlagerung gesichert.According to Fig. 1 has a impression roller 1 a cylinder 2, which has a metallic cylinder core 3 and a partially conductive sleeve sleeve 4.1 and a rubber-elastic, electrically semiconducting layer 4 on the outer circumference. The layer 4 consists for example of rubber with embedded carbon black, carbon fiber or graphite particles. Further, the impression roller 1 has a fixed to the cylinder core 3 shaft 5 made of steel, which is mounted on both sides in pivot bearings in the form of radial ball bearings 6. The ball bearings 6 are supported on the one hand on a radial shoulder of the shaft 5 and on the other hand secured by a pushed onto the shaft sleeve body 7 against axial displacement.

Die Kugellager 6 sind außen in Lagerschalen 8 aus elektrisch isolierendem Material gelagert, die ihrerseits in einem nicht gezeigten Maschinenrahmen gehalten sind.The ball bearings 6 are mounted outside in bearing shells 8 made of electrically insulating material, which in turn are held in a machine frame, not shown.

Die Welle 5 hat eine zentrale Bohrung 9 zum Zuführen von Druckluft zum Zwecke des Austauschs einer Sleeve-Hülse 4.1 am Mantel des Presseurs.The shaft 5 has a central bore 9 for supplying compressed air for the purpose of replacing a sleeve sleeve 4.1 on the jacket of the impression.

Eine Drehdurchführung 10 zum Einspeisen von Druckluft ist in die Bohrung 9 an der Stirnseite der Welle 5 eingesetzt. Ferner ist ein Rotor 11 mit einem hohlzylindrischen Abschnitt 12 und einem Flansch 13 an einem Ende mittels Schrauben 14 an der Stirnseite der Welle 5 angeschraubt. Der Flansch 13 sichert den Hülsenkörper 7 gegen axiale Verlagerung. Der hohlzylindrische Abschnitt umgibt die Drehdurchführung 10.A rotary feedthrough 10 for supplying compressed air is inserted into the bore 9 on the end face of the shaft 5. Further, a rotor 11 is screwed with a hollow cylindrical portion 12 and a flange 13 at one end by means of screws 14 on the end face of the shaft 5. The flange 13 secures the sleeve body 7 against axial displacement. The hollow cylindrical section surrounds the rotary leadthrough 10.

Der hohlzylindrische Abschnitt 12 des Rotors 11 ist von einem im Wesentlichen kreiszylindrischen Stator 15 umgeben. Der Stator 15 besteht aus einem elektrisch isolierenden Material. Er ist über Schrauben 16 an einer maschinenrahmenfesten Befestigungsplatte 17 fixiert.The hollow cylindrical portion 12 of the rotor 11 is surrounded by a substantially circular cylindrical stator 15. The stator 15 is made of an electrically insulating material. It is fixed by screws 16 on a machine frame fixed mounting plate 17.

In den Stator 15 ist eine metallische Ringscheibe 18 eingesetzt, die am Innenumfang des Stators 15 mittels nicht gezeigter Mittel fixiert ist. Der Stator und die Ringscheibe 18 weisen miteinander fluchtende Einstecklöcher auf, in die ein Steckverbinder 19 mit einem nicht gezeigten Kontaktzapfcn eingesetzt wird. Der Steckverbinder 19 hat eine aus der Zeichenebene von Fig. 1 geschwenkte Einsteckachse.In the stator 15, a metallic annular disc 18 is used, which is fixed on the inner circumference of the stator 15 by means not shown. The stator and the annular disc 18 have mutually aligned insertion holes into which a connector 19 is inserted with a Kontaktzapfcn, not shown. The connector 19 has a from the plane of Fig. 1 pivoted plug-in axis.

Am Innenumfang des Stators 15 ist auf beiden Seiten der Ringscheibe 18 jeweils ein Wellendichtring 20, 21 angeordnet. Jeder Wellendichtring 20, 21 hat eine starre, L-förmige Basis 22, 23, wobei an dem zur Welle senkrechten Schenkel 24, 25 der Basis eine elastische Dichtlippe 26, 27 in spitzwinkliger Ausrichtung zu diesem Schenkel 24, 25 fixiert ist. Die Dichtlippen 26, 27 der beiden Wellendichtringe 20, 31 sind aufeinander zu geneigt.On the inner circumference of the stator 15, a shaft sealing ring 20, 21 is arranged on both sides of the annular disc 18. Each shaft sealing ring 20, 21 has a rigid, L-shaped base 22, 23, wherein on the leg perpendicular to the shaft 24, 25 of the base an elastic sealing lip 26, 27 in acute-angled alignment with this leg 24, 25 is fixed. The sealing lips 26, 27 of the two shaft sealing rings 20, 31 are inclined towards each other.

Die Dichtlippen 26, 27 der Wellendichtringe sitzen gleitend auf dem hohlzylindrischen Abschnitt 12 des Rotors 11 auf.The sealing lips 26, 27 of the shaft seals are slidably mounted on the hollow cylindrical portion 12 of the rotor 11.

Die Ringscheibe 18 hat eine Radialbohrung 28, in der ein federnder Kontaktstift 29 sitzt.The annular disc 18 has a radial bore 28 in which a resilient contact pin 29 is seated.

Gemäß Fig. 4 hat der federnde Kontaktstift einen Grundkörper in Form einer Hülse 30, der an beiden Stirnseiten durch eine Wand 31, 32 geschlossen ist. Die Wand 31 weist eine Öffnung 33 auf, durch die hindurch sich ein elektrisch leitfähiges Kontaktelement 34 erstreckt, das stiftförmig ist. Das elektrisch leitfähige Kontaktelement 34 ist an einem inneren Ende mit einem radialen Vorsprung 35 in Form eines Flansches versehen. Die Wand 31 bildet mit dem Rand der Öffnung 33 einen Anschlag 36 und der Flansch 35 mit der Oberseite einen Gegenanschlag 37.According to Fig. 4 the resilient contact pin has a main body in the form of a sleeve 30 which is closed at both ends by a wall 31, 32. The wall 31 has an opening 33 through which extends an electrically conductive contact element 34 which is pin-shaped. The electrically conductive contact element 34 is provided at an inner end with a radial projection 35 in the form of a flange. The wall 31 forms with the edge of the opening 33 a stop 36 and the flange 35 with the top of a counter-stop 37th

Der Kontaktstift 29 weist außerhalb der Hülse 30 ein balliges Ende 38 auf.The contact pin 29 has a spherical end 38 outside of the sleeve 30.

Die Hülse 30 hat am Umfang einen umlaufenden, vorstehenden Wulst 39.The sleeve 30 has on the circumference a circumferential, protruding bead 39th

In der Hülse 30 ist eine Druckfeder in Form einer Schraubenfeder 40 angeordnet, die sich einenends an der Stirnseite des Kontaktelementes 34 und anderenends an der Innenseite der gegenüberliegenden Wand 32 abstützt.In the sleeve 30, a compression spring in the form of a coil spring 40 is arranged, which is supported at one end on the end face of the contact element 34 and the other end on the inside of the opposite wall 32.

Der Wulst 39 hat in der Radialbohrung der Ringscheibe einen Prcsssitz.The bead 39 has a seat in the radial bore of the washer.

Der federnde Kontaktstift ist so justiert, dass der Kontaktstift mit dem balligen Ende 38 auf dem hohlzylindrischen Abschnitt des Rotors aufsitzt.The resilient contact pin is adjusted so that the contact pin rests with the crowned end 38 on the hollow cylindrical portion of the rotor.

Die Hülse 30, der Kontaktelement 34 und die Schraubenfeder 40 sind aus einem elektrisch leitfähigen Material.The sleeve 30, the contact element 34 and the coil spring 40 are made of an electrically conductive material.

Der Hohlraum zwischen der Ringscheibe 18 und den beiden Wellendichtringen 20, 21 ist mit einem elektrisch leitfähiger Fluid gefüllt.The cavity between the annular disc 18 and the two shaft sealing rings 20, 21 is filled with an electrically conductive fluid.

Von einer elektrischen Spannungsversorgung wird über den Steckverbinder 19 eine elektrische Spannung an die Ringscheibe 18 aus elektrisch leitfähigem Material herangeführt. Von der Ringscheibe 18 aus gelangt die Spannung über den federnden Kontaktstift 29 an den hohlzylindrischen Abschnitt 12 des Rotors 11. Der Kontaktstift 34 schleift sich nach kurzer Betriebszeit ein, so dass sein balliges Ende eine Abplattung 41 aufweist. Dies ist in Fig. 3 und 4b gezeigt. Zwischen der Abplattung 41 und dem hohlzylindrischen Abschnitt 12 ist ein Spalt 42 vorhanden, der im Beispiel eine Weite von 1 bis 3 µm aufweist.From an electrical power supply, an electrical voltage is supplied to the annular disc 18 made of electrically conductive material via the connector 19. From the annular disc 18, the voltage passes through the resilient contact pin 29 to the hollow cylindrical portion 12 of the rotor 11. The contact pin 34 grinds in after a short period of operation, so that its spherical end has a flattening 41. This is in Fig. 3 and 4b shown. Between the flattening 41 and the hollow cylindrical portion 12 there is a gap 42, which in the example has a width of 1 to 3 μm.

Über den Spalt 42 gelangt die elektrische Spannung vom Kontaktsrift 34 auf den hohlzylindrischen Abschnitt 12. Zusätzlich gelangt die elektrische Spannung über das elektrisch leitfähige Fluid vom Kontaktstift 34 auf dem hohlzylindrischen Abschnitt 12. Diese Spannungsübertragung erfolgt insbesondere im Bereich des Spaltes 42.In addition, the electrical voltage passes via the electrically conductive fluid from the contact pin 34 on the hollow cylindrical portion 12. This voltage transmission takes place in particular in the region of the gap 42nd

Claims (15)

  1. An impression roller of a rotary press with
    • a cylinder (2), which is electrically conductive in at least one area,
    • devices for rotatably mounting (6) the cylinder around its cylinder axis and
    • at least one device for supplying an electric voltage to the electrically conductive area, and having
    • a shaft (12), electrically conductive and coaxial to the cylinder (2), fixedly connected to the cylinder (2) and electrically connected to the electrically conductive area of the cylinder,
    • at least one stationary device for guiding (30) at least one electrically conductive contact element (34) to the circumference of the shaft (12),
    • at least one electrically conductive contact element (34), within the device for guiding (30) and adapted to be electrically connected to a voltage supply,
    • at least one spring element (40), pressing the electrically conductive contact element (34) against the circumference of the shaft (12), wherein the contact element (34) and the circumferential area of the shaft (12) to which the contact element (34) is guided are matchingly ground to each other, and
    • a limit stop (36) of the device for guiding (30) and a counter-stop (37) of the contact element (34), which limit the displacement of the contact element (34) in the action direction of the spring element (40), characterised in that
    • the limit stop (36) rests on the counter-stop (37) and
    • there is a gap (42) between contact element (34) and shaft (12).
  2. An impression roller of a rotary press with
    • a cylinder (2), which is electrically conductive in at least one area,
    • devices for rotatably mounting (6) the cylinder around its cylinder axis and
    • at least one device for supplying an electric voltage to the electrically conductive area, and having
    • an axis, electrically conductive and coaxial to the cylinder (2), disposed stationarily and adapted to be electrically connected to a voltage supply,
    • at least one device (30) for guiding at least one electrically conductive contact element (34) to the circumference of the axis, fixedly connected to the cylinder (2),
    • at least one electrically conductive contact element (34), within the device (30) for guiding and being electrically connected to the conductive area of the cylinder (2),
    • at least one spring element (40), pressing the electrically conductive contact element (34) against the circumference of the axis, wherein the contact element (34) and the circumferential area of the axis to which the contact element (34) is guided are matchingly ground to each other, and
    • a limit stop (36) of the device for guiding (30) and a counter-stop (37) of the contact element (34), which limit the displacement of the contact element (34) in the action direction of the spring element (40),
    characterised in that
    • the limit stop (36) rests on the counter-stop (37) and
    • there is a gap (42) between contact element (34) and axis (12).
  3. An impression roller according to claim 1 or 2, wherein the shaft (12) or axis consists of steel and/or the contact element (34) consists of graphite or brass or a soft metal, and/or wherein the shaft (12) or axis is polished at least in the circumferential area towards which the contact element (34) is directed.
  4. An impression roller according to any one of claims 1 to 3, wherein the gap (42) has a width in the range of at least 1/10 µm to 10 µm.
  5. An impression roller according to any one of claims 1 to 4, wherein the device for guiding (30) has a base body which has a guide for at least one electrically conductive contact element (34).
  6. The impression roller according to claim 5, wherein the base body (30) is electrically conductive.
  7. An impression roller according to claim 5 or 6, wherein the base body is a sleeve (30) which is closed by a wall (31, 32) at both front sides, wherein one wall (31) has an opening (33) across which the electrically conductive contact element (34) extends, which is provided with at least one radial projection (35) at an end disposed in the interior of the sleeve (30), wherein the wall (31) forms the limit stop (36) with the edge of the opening (33), and the radial projection forms the counter-stop (37).
  8. The impression roller according to claim 7, wherein the spring element (40) is a compression spring element, bearing against one end of the contact element (34) and against the side of the other front end wall (32) of the base body (30) arranged in the interior of the sleeve (30), and/or wherein the one spring element (40) is a helical spring.
  9. An impression roller according to claim 7 or 8, wherein the sleeve (30) has means (39) at its circumference, for fastening the sleeve in a bore (28) of a holder (18).
  10. An impression roller according to any one of claims 1 to 9, wherein the device for guiding (30) is directed radially to the shaft (12) or axis.
  11. An impression roller according to any one of claims 1 to 10, wherein the electrically conductive contact element (34) is a contact pin.
  12. The impression roller according to claim 11, wherein the one contact pin (34) is crowned on that end (38) which faces the shaft or axis.
  13. An impression roller according to any one of claims 1 to 12, wherein several electrically conductive contact elements (34) occupy different angular positions on the shaft (12) or axis, and/or wherein several electrically conductive contact elements (34) occupy different positions in the axial direction of the shaft (12) or axis.
  14. An impression roller according to any one of claims 1 to 13, wherein the device for supplying an electric voltage has a stator (15) or rotor, disposed in a distance from the shaft (12) or axis and concentrically to the cylinder axis, a cavity between the shaft (12) and the stator (15) or between the axis and the rotor, in which the one device for guiding (30) having the contact element (34) and the one spring element (40) is arranged, an electrically conductive fluid in the cavity and at least one means for preventing (20, 21) the electrically conductive fluid from flowing out of the cavity.
  15. The impression roller according to claim 14, wherein the stator (15) has a stator electrode or the rotor has a rotor electrode, wherein the stator electrode is adapted for connection to the electric voltage supply, or the rotor electrode is electrically connected to the electrically conductive area.
EP20100015110 2010-03-02 2010-11-30 Impression roller Active EP2363287B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201020003517 DE202010003517U1 (en) 2010-03-02 2010-03-02 impression roller

Publications (2)

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EP2363287A1 EP2363287A1 (en) 2011-09-07
EP2363287B1 true EP2363287B1 (en) 2012-10-03

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DE (1) DE202010003517U1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014103084U1 (en) 2014-07-04 2015-10-06 Christa Dettke Machine for processing a web material

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012101814A1 (en) * 2012-03-05 2013-09-05 GAT Gesellschaft für Antriebstechnik mbH Radial rotary feed through for transfer of free-flowing media between stationary and rotating machine portions, has rotatable shaft with two shaft ends, where latter shaft end is equipped with shaft bearing
DE202013007840U1 (en) * 2013-09-04 2014-03-10 Christa Dettke impression roller

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4904213A (en) * 1989-04-06 1990-02-27 Motorola, Inc. Low impedance electric connector
DE9218818U1 (en) 1992-02-18 1995-08-31 Eltex Elektrostatik Gmbh Impressionist
US5899753A (en) * 1997-04-03 1999-05-04 Raytheon Company Spring-loaded ball contact connector
DE202007002726U1 (en) 2007-02-26 2008-07-03 Dettke, Christa impression roller

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202014103084U1 (en) 2014-07-04 2015-10-06 Christa Dettke Machine for processing a web material
EP2990365A1 (en) 2014-07-04 2016-03-02 Christa Dettke Machine for machining a web material

Also Published As

Publication number Publication date
DE202010003517U1 (en) 2011-07-12
EP2363287A1 (en) 2011-09-07

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