EP0646293B1 - Electrode de charge - Google Patents

Electrode de charge Download PDF

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Publication number
EP0646293B1
EP0646293B1 EP94909006A EP94909006A EP0646293B1 EP 0646293 B1 EP0646293 B1 EP 0646293B1 EP 94909006 A EP94909006 A EP 94909006A EP 94909006 A EP94909006 A EP 94909006A EP 0646293 B1 EP0646293 B1 EP 0646293B1
Authority
EP
European Patent Office
Prior art keywords
housing
electrode
electrode according
charge electrode
charge
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP94909006A
Other languages
German (de)
English (en)
Other versions
EP0646293A1 (fr
Inventor
Ernst August Hahne
Franz Knopf
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.)
Eltex Elektrostatik GmbH
Original Assignee
Eltex Elektrostatik GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Eltex Elektrostatik GmbH filed Critical Eltex Elektrostatik GmbH
Publication of EP0646293A1 publication Critical patent/EP0646293A1/fr
Application granted granted Critical
Publication of EP0646293B1 publication Critical patent/EP0646293B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T19/00—Devices providing for corona discharge
    • H01T19/04—Devices providing for corona discharge having pointed electrodes

Definitions

  • Electrodes for charging are known in a variety of embodiments (DE-35 22 881). These known electrodes are used to apply electrical surface charges, the tips of the individual electrodes for electrical decoupling very often being connected to the generator supply voltage via series resistors. If such tips are arranged along a straight line and cast in an electrode profile, electrical charging can thus also be operated on high-speed printing presses with a working width of several meters. As a result of the charging, electrical field forces are used to press substrates onto metal rollers or to block multi-layer substrates.
  • switchable individual electrodes have become known (DE-29 48 902), which can be used to adapt to the working width of the printing press by switching individual electrodes on or off.
  • the Switching takes place via a hydraulic or pneumatic medium, which is fed separately to the individual electrode via a pressure-tight line.
  • the switchable individual electrodes take up a large amount of space, so that a high-voltage electrode of large size results overall. Furthermore, the problems of sparking when switching in areas of application in explosion-proof rooms are unacceptable, quite apart from the fact that discharge paths, leakage currents etc. nevertheless result when the electrodes are switched off.
  • the disadvantage here is that a number of switching lines corresponding to the switchable number of individual electrodes plus a line to the high-voltage source is required.
  • the automatic control of the groups of electrodes is complex.
  • the invention is therefore based on the object of developing a charging electrode in accordance with the preamble of the main claim in such a way that any number of individual electrodes can be activated or deactivated in the simplest way.
  • the individual electrodes are poured with their tips into a metal housing that is open on one side and such an electrode is installed, electrically insulated from the housing, the surface of this metal housing will become charged during operation due to the electrical influence. If you coat this metallic housing with electrical insulation, the electrodes work as if they had an electrically insulating plastic housing.
  • the protruding tips of the individual electrodes on the open side of the metallic housing can be made almost currentless by means of cover slides, which are metallically conductive, preferably made of metal, if those tips of the individual electrodes can be removed by means of the covering device, which together with the housing has a high-resistance Receives connection to earth, can be made almost currentless if you cover those tips of the individual electrodes spatially spaced that should no longer emit.
  • the covering device which is designed to be electrically conductive, comes in front of an emitting tip of a single electrode, its surface at the point opposite the tip assumes approximately the same potential as that of the tip. This reduces the field strength at the tip to such small values that the emission current is practically zero. It has also surprisingly been found that the emission current increases linearly with the number of peaks not covered.
  • the charging electrode 6 has a metallic housing 11. Individual electrodes with tips 3 are arranged therein, which can be connected to an electrical high-voltage source via a series resistor 1.
  • the series resistor 1 is embedded in an electrically insulating resin 2 and the tips 3 of the individual electrode protrude from this resin 2.
  • the tip 3 of the individual electrode is arranged at a distance from a paper web 13, which runs over a cooling roller, designated overall by 14.
  • the individual electrode together with tip 3 with its series resistor 1 and the electrically insulating resin 2 are arranged in a separate electrode housing 7, which is electrically conductive and is preferably made of metal and cuboid with a - in the drawing down - open side 8 for the Tips 3 of the individual electrodes is formed.
  • This electrode housing 7 is provided with electrical insulation from the outside and inserted into a rectangular recess 9 in the housing 11.
  • grooves 10 are provided for a cover device 4 in the form of a metallic slide, which can be moved longitudinally in the grooves 10 by means of a driver 5 in the illustrated embodiment controlled by a pneumatic cylinder, so that the tips 3 of the Individual electrodes can be covered as a whole in any manner, as shown schematically in FIG. 2.
  • the housing and the slider 10 have an electrically good conductive connection. Both parts are connected to earth via a resistor in the order of 1 gigohm.
  • the high voltage source is shown schematically with "U".

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Details Of Resistors (AREA)
  • Elimination Of Static Electricity (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Heat Sensitive Colour Forming Recording (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Apparatus For Radiation Diagnosis (AREA)
  • Thermistors And Varistors (AREA)
  • Emergency Protection Circuit Devices (AREA)

Claims (12)

  1. Electrode de charge (6), munie d'un boîtier métallique (11) et, disposées à l'intérieur de celui-ci, deux ou plusieurs électrodes individuelles ainsi que des résistances série (1) pouvant être raccordées à une source de haute tension (U), chaque électrode individuelle étant munie d'une pointe (3) et le boîtier (11) présentant à proximité desdites pointes (3) une ouverture,
       CARACTERISEE en ce que chaque pointe (3) est recouverte au moyen d'un dispositif de recouvrement (4) conformé en conducteur électrique, en ce que ce dernier est électriquement conducteur et relié au boîtier (11), et en ce que ledit boîtier (11) et ledit dispositif de recouvrement (4) sont connectés à l'une des bornes d'une résistance dont l'autre borne est connectable à la terre.
  2. Electrode de charge selon la revendication 1, caractérisée en ce que le dispositif de recouvrement électrique (4) comporte du métal.
  3. Electrode de charge selon les revendications 1 ou 2, caractérisée en ce que le dispositif de recouvrement électrique 4 est réalisé sous la forme d'un tiroir.
  4. Electrode de charge selon l'une des revendications 1 à 3, caractérisée en ce que le tiroir (4) peut coulisser dans deux rainures (10) du boîtier (11).
  5. Electrode de charge selon l'une des revendications 1 à 4, caractérisée en ce que l'électrode individuelle est noyée dans une résine (2) électriquement isolante.
  6. Electrode de charge selon l'une des revendications 1 à 5, caractérisée en ce que toutes les électrodes individuelles sont disposées à l'intérieur d'une boîte à électrodes (7).
  7. Electrode de charge selon la revendication 6, caractérisée en ce que la boîte à électrodes 7 est conformée en conducteur électrique.
  8. Electrode de charge selon la revendication 7, caractérisée en ce que la boîte à électrodes 7 est constituée en métal.
  9. Electrode de charge selon l'une des revendications 1 à 8, caractérisée en ce que la boîte à électrodes (7) est réalisée en forme de parallélépipède présentant un côté ouvert (8) pour les pointes (3) des électrodes individuelles.
  10. Electrode de charge selon l'une des revendications 6 à 9, caractérisée en ce que la boîte à électrodes est munie sur son côté extérieur d'une isolation électrique.
  11. Electrode de charge selon l'une des revendications 6 à 10, caractérisée en ce que la boîte à électrodes (7) est insérée dans un logement (9) de forme parallélépipédique du boîtier (11).
  12. Electrode de charge selon la revendication 11, caractérisée en ce que le logement (9) de forme parallélépipédique est muni au niveau de son côté ouvert (8), des deux rainures (10) prévues pour le dispositif de recouvrement (4).
EP94909006A 1993-04-16 1994-02-20 Electrode de charge Expired - Lifetime EP0646293B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE4312483 1993-04-16
DE4312483A DE4312483C1 (de) 1993-04-16 1993-04-16 Aufladeelektrode
PCT/EP1994/000487 WO1994024737A1 (fr) 1993-04-16 1994-02-20 Electrode de charge

Publications (2)

Publication Number Publication Date
EP0646293A1 EP0646293A1 (fr) 1995-04-05
EP0646293B1 true EP0646293B1 (fr) 1996-09-25

Family

ID=6485641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94909006A Expired - Lifetime EP0646293B1 (fr) 1993-04-16 1994-02-20 Electrode de charge

Country Status (7)

Country Link
US (1) US5517384A (fr)
EP (1) EP0646293B1 (fr)
JP (1) JPH07508128A (fr)
AT (1) ATE143535T1 (fr)
DE (2) DE4312483C1 (fr)
ES (1) ES2092405T3 (fr)
WO (1) WO1994024737A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5907468A (en) * 1994-10-19 1999-05-25 Haug Gmbh & Co. Kg Device for applying unipolar electrical charges to a moving electrically-insulated surface using a corona electrode
DE102005048002B4 (de) * 2005-10-06 2010-03-25 Eltex-Elektrostatik Gmbh Hochspannungselektrodenanordnung

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU42298A1 (fr) * 1961-09-12 1962-11-02
US3334227A (en) * 1964-03-24 1967-08-01 Scae Sa Flexible corona discharge electrode with means to vary the length of the emitting portion
US3397136A (en) * 1965-10-07 1968-08-13 Deerpark Machine Co Corona treating apparatus having an electrode with an adjustable width
DE1589743A1 (de) * 1967-08-22 1970-04-30 Eltex Elektronik Gmbh Stabfoermige Ionisationselektrode zum Entladen lichtempfindlicher Materialien
US3578970A (en) * 1968-05-03 1971-05-18 Plastic Coating Corp Variable width corona discharge apparatus with means to shield or vary a predetermined length of a corona discharge wire
AU421643B2 (en) * 1968-11-11 1972-02-23 The Commonwealth Of Australia A method of countour charging
US3890504A (en) * 1973-02-27 1975-06-17 Walco Systems Inc Adjustable corona discharge electrode
IT1103665B (it) * 1978-01-12 1985-10-14 Gianfranco Galimberti Dispositivo per attuare un trattamento superficiale uniforme su materie plastiche mediante scariche elettriche ad effetto corona
US4216518A (en) * 1978-08-01 1980-08-05 The Simco Company, Inc. Capacitively coupled static eliminator with high voltage shield
CH638071A5 (de) * 1979-02-21 1983-08-31 Walter Spengler Hochspannungselektrodenanordnung mit einer anzahl einzeln ein- und ausschaltbarer spitzenelektroden.
US4523082A (en) * 1983-05-05 1985-06-11 Sturdevant Eugene J Electrode shield device
DE3522881C1 (de) * 1985-06-26 1986-10-02 Eltex-Elektrostatik Gesellschaft mbH, 7858 Weil Hochspannungselektrode
DE3725142A1 (de) * 1987-07-29 1989-02-09 Eltex Elektrostatik Gmbh Hochspannungselektrode
GB9020860D0 (en) * 1990-09-25 1990-11-07 Mountain Breeze Ltd Improvements in and relating to air ionisers
DE4105195A1 (de) * 1991-02-20 1992-08-27 Ahlbrandt Andreas Vorrichtung zur behandlung von oberflaechen durch spruehentladungen

Also Published As

Publication number Publication date
DE4312483C1 (de) 1994-06-09
EP0646293A1 (fr) 1995-04-05
ATE143535T1 (de) 1996-10-15
JPH07508128A (ja) 1995-09-07
US5517384A (en) 1996-05-14
ES2092405T3 (es) 1996-11-16
DE59400738D1 (de) 1996-10-31
WO1994024737A1 (fr) 1994-10-27

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