EP0224820B1 - Corotron wire case for electrophotographic printing or copying machines - Google Patents

Corotron wire case for electrophotographic printing or copying machines Download PDF

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Publication number
EP0224820B1
EP0224820B1 EP86116173A EP86116173A EP0224820B1 EP 0224820 B1 EP0224820 B1 EP 0224820B1 EP 86116173 A EP86116173 A EP 86116173A EP 86116173 A EP86116173 A EP 86116173A EP 0224820 B1 EP0224820 B1 EP 0224820B1
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EP
European Patent Office
Prior art keywords
wire
corona
shaped electrode
generating device
case
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
EP86116173A
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German (de)
French (fr)
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EP0224820A1 (en
Inventor
Karl Heigl
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Canon Production Printing Germany GmbH and Co KG
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Siemens AG
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Publication date
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Publication of EP0224820A1 publication Critical patent/EP0224820A1/en
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Publication of EP0224820B1 publication Critical patent/EP0224820B1/en
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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0258—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices provided with means for the maintenance of the charging apparatus, e.g. cleaning devices, ozone removing devices G03G15/0225, G03G15/0291 takes precedence
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/02—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices
    • G03G15/0291—Apparatus for electrographic processes using a charge pattern for laying down a uniform charge, e.g. for sensitising; Corona discharge devices corona discharge devices, e.g. wires, pointed electrodes, means for cleaning the corona discharge device

Definitions

  • the invention relates to a corona generating device for electrophotographic printing or copying devices, according to the preamble of claim 1.
  • Corona producing devices are used for electrophotographic printing or copying machines for a variety of purposes. E.g. for loading the photoconductor, for transferring a developed image to the continuous paper in the transfer printing station, for removing background particles from a developed latent electrostatic image and for cleaning the photoconductor drum by neutralizing the charge on the remaining toner particles.
  • such corona generating devices generally consist of at least one wire-shaped electrode, the so-called corotron wire, which is surrounded by a shield.
  • corona generating devices are capable of causing a uniform electrostatic charge on the surface provided, dust particles, toner particles or other particles can accumulate on or around the corotron wire and its shield and cause an uneven generation of the corona current along the length of the corotron wire.
  • DE-OS 24 24 835 it is known from DE-OS 24 24 835 to provide cleaning devices in corona generating devices.
  • the object of the invention is to design a corona-generating device of the type mentioned at the outset such that, on the one hand, the wire-shaped electrode can be easily replaced, and on the other hand, easy cleaning of the corona-generating device is possible.
  • the length of the wire-shaped electrode should be adjustable.
  • the corotron wire can be easily changed over the cassette in the event of wear, without the wire having to be touched.
  • the supply spool in the corotron wire cassette is connected to a spring element which e.g. can be a coil spring.
  • an electric motor-operated setting device is provided in the corona-producing device, which detects the end of the wire-shaped electrode on the cassette via a holding element and pulls it out of the cassette depending on the paper width to be processed .
  • the holding element can be part of a cleaning element e.g. of a scraper element that serves to clean the area of the corona-producing device that receives the wire-shaped electrode.
  • a cleaning slide with the wire-shaped electrode suspended therein is moved back and forth from the corona-producing device via an electromotive device.
  • the wire-shaped electrode is passed through a cleaning device in the form of two felt rings arranged in the corotron wire cassette.
  • a cleaning device in the form of two felt rings arranged in the corotron wire cassette.
  • a corona-generating device is provided in the transfer printing station of a printing device operating on the principle of electrophotography, as described, for example, in US Pat. No. 3,634,077.
  • the corona-producing device extends along a photoconductor drum 10. It consists of a pivotable frame 11 with a guide channel 12 formed thereon for receiving a cleaning slide 13 which, with the help of a motorized device, consists of a geared motor 14 with an associated scanning device 15 can be moved via pulleys 16 in the guide channel 12.
  • a rope 17 is tensioned over the rope pulleys 16, with one part being attached to the cleaning slide 13.
  • a replaceable corotron wire cassette 18, which receives the wire-shaped electrode 19 (FIG. 2) of the corona-producing device, is latched on one side of the frame 11.
  • the corotron wire cassette consists of a plastic housing 20, of two half-shells that can be glued together.
  • a supply coil 21 is rotatably fastened in the plastic housing 20 for receiving the wire-shaped electrode 19 consisting of tungsten wire of approximately 0.08 mm in diameter.
  • the coil 21 has a lateral incision 22 via which the beginning of the tungsten wire is led out of the coil and via a screw 23 is fixed on the supply spool 21.
  • Installed in the supply spool 21 is a spiral return spring 24, which is attached at one end 25 to the supply spool 21 and with its other end 26 via e.g. a clamping piece on an extension of the housing 20, which e.g.
  • a deflection roller 27 for the wire-shaped electrode is rotatably attached to a corner of the plastic housing 20 of the corotron wire cassette.
  • Two felt rings 28 are arranged on the deflection roller 27, between which the wire-shaped electrode (corotron wire) is passed.
  • guides 30 are provided in a recess 29 for receiving a coupling tab (hanging tab) 31.
  • the coupling tab which is firmly connected to the corotron wire via a fastening point 32, is guided freely in the guides 30 and has a receiving opening 33 for receiving a retaining element 34 of the cleaning slide 13, which is designed as a latching element.
  • a cutout 35 which is penetrated by the corotron wire 19 for receiving a sliding contact 36 which contacts the corotron wire 19.
  • a control device 37 is provided which is in operative connection with the scanning device 15 and the geared motor 14.
  • the control device 37 contains an actual input device 38.
  • This input device can e.g. consist of a rotary knob or a digital keyboard, via which the width of the paper to be processed is entered. Depending on the width of the paper to be entered, the wire-shaped electrode 19 is then pulled out of the corotron wire cassette 18.
  • the desired width of the paper entered in a comparison device 39, and thus the pull-out length of the corotron wire 19 with the actual pull-out length of the corotron wire 19, and thus the position of the cleaning slide 13, derived from the scanning device 15, are compared with one another and thus the e.g. Geared motor 14 designed as a stepper motor.
  • the input device 38 it is also possible to combine the input device 38 with the paper width adjustment device in such a way that corresponding signals are automatically fed to the input device 38 when the paper width is adjusted.
  • a e.g. resilient cassette holder of the frame 11 For the operation of such a corona generating device, a e.g. resilient cassette holder of the frame 11, the corotron wire cassette 18 inserted until it snaps into the cassette holder 40.
  • the cleaning slide 13 is in the left stop position of FIG. 1.
  • the retaining lug of the retaining element 34 engages in the receiving opening 33 of the coupling tab 31 of the corotron wire cassette 18.
  • the Corotron wire 19 is contacted via the sliding contact 36 and, if necessary, applied with the corresponding Corona voltage.
  • the corotron wire 19 is then pulled out of the corotron wire cassette 18 by the cleaning slide 13 against the force of the return spring 24.
  • the cleaning slide 13 In a cleaning procedure that can be called up by the control device 37, the cleaning slide 13 is moved back and forth over the length of the guide channel for cleaning the corotron wire 19 and the guide channel 12 (transfer printing rail). During this back and forth movement, the corotron wire 19 is simultaneously cleaned by the two felt rings 28, between which the corotron wire 19 is moved. If the corotron wire 19 is used up and the corotron wire cassette 18 is to be replaced for this reason, the cleaning slide 13 is moved back into its rest position at the left stop of the guide channel 12. As a result, the corotron cassette 18 is unlocked and it can be removed from the cassette holder 14 in a simple manner for replacement.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)

Description

Die Erfindung betrifft eine coronaerzeugende Einrichtung für elektrofotografische Druck- oder Kopiergeräte, gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a corona generating device for electrophotographic printing or copying devices, according to the preamble of claim 1.

Coronaerzeugende Einrichtungen werden für elektrofotografischen Druck- oder Kopiergeräten für eine Vielzahl von Zwecken eingesetzt. Z.B. zum Laden des Fotoleiters, zum Übertragen eines entwickelten Bildes auf das Endlospapier in der Umdruckstation, zum Entfernen von Hintergrundteilchen von einem entwickelten latenten elektrostatischen Bild und zum Reinigen der Fotoleitertrommel durch Neutralisieren der Ladung auf den restlichen Tonerteilchen.Corona producing devices are used for electrophotographic printing or copying machines for a variety of purposes. E.g. for loading the photoconductor, for transferring a developed image to the continuous paper in the transfer printing station, for removing background particles from a developed latent electrostatic image and for cleaning the photoconductor drum by neutralizing the charge on the remaining toner particles.

Wie aus der US-PS 2 856 533 oder der DE-OS 2 424 835 entnehmbar, bestehen derartigen coronaerzeugenden Einrichtungen im allgemeinen aus wenigstens einer drahtförmigen Elektrode dem sogenannten Corotrondraht der von einer Abschirmung umgeben ist.As can be seen from US Pat. No. 2,856,533 or DE-OS 2,424,835, such corona generating devices generally consist of at least one wire-shaped electrode, the so-called corotron wire, which is surrounded by a shield.

Obwohl diese coronaerzeugende Einrichtungen eine gleichmäßige elektrostatische Ladung auf der dafür vorgesehenen Oberfläche zu bewirken vermögen, können Staubteilchen, Tonerteilchen oder andere Teilchen sich auf oder um den Corotrondraht und seiner Abschirmung ansammeln und eine ungleichmäßige Erzeugung des Coronastromes entlang der Länge des Corotrondrahtes hervorrufen. Zu diesem Zwecke ist es aus der DE-OS 24 24 835 bekannt, in coronaerzeugenden Einrichtungen Reinigungsvorrichtungen vorzusehen.Although these corona generating devices are capable of causing a uniform electrostatic charge on the surface provided, dust particles, toner particles or other particles can accumulate on or around the corotron wire and its shield and cause an uneven generation of the corona current along the length of the corotron wire. For this purpose it is known from DE-OS 24 24 835 to provide cleaning devices in corona generating devices.

Weiters ist es üblich, einen über die ganze Länge eines Zwischenträgers (Photoleitertrommel) reichenden Corotrondraht an ortsfesten Endpunkten einzuhängen. Der beim Bedrucken von Papierbögen, die schmaler sind als der Fotoleiter, frei über der Fotoleitertrommel gespannte Corotrondraht in der Umdruckstation verunreinigt und beschädigt die Beschichtung des Fotoleiters in den nicht vom Papier abgedeckten Bereichen.Furthermore, it is common to hang a corotron wire extending over the entire length of an intermediate carrier (photoconductor drum) at fixed end points. When printing on paper sheets that are narrower than the photoconductor, the corotron wire stretched freely over the photoconductor drum in the transfer station contaminates and damages the coating of the photoconductor in the areas not covered by the paper.

Aufgabe der Erfindung ist es, eine coronaerzeugende Einrichtung der eingangs genannten Art so auszugestalten, daß einerseits die drahtförmige Elektrode leicht ausgetauscht werden kann, andererseits eine leichte Reinigung der coronaerzeugenden Einrichtung möglich ist.The object of the invention is to design a corona-generating device of the type mentioned at the outset such that, on the one hand, the wire-shaped electrode can be easily replaced, and on the other hand, easy cleaning of the corona-generating device is possible.

Weiters soll die drahtförmige Elektrode in ihrer Länge variabel einstellbar sein.Furthermore, the length of the wire-shaped electrode should be adjustable.

Diese Aufgabe wird bei einer coronaerzeugenden Einrichtung der eingangs genannte Art gemäß dem kennzeichnenden Teil des ersten Patentanspruches gelöst.This object is achieved in a corona generating device of the type mentioned at the outset according to the characterizing part of the first claim.

Vorteilhafte Ausführungsformen der Erfindung sind in den abhängigen Ansprüchen gekennzeichnet.Advantageous embodiments of the invention are characterized in the dependent claims.

Durch die Anordnung einer auswechselbar in einer Kassettenaufnahme des Gerätes befestigten Corotrondrahtkassette in der der Corotrondraht auf einer Vorratsspule aufgewickelt ist, läßt sich der Corotrondraht im Verschleißfalle leicht über die Kassette wechseln, ohne daß dazu der Draht berührt werden muß. Um einerseits für eine Vorspannung der drahtförmigen Oberelektrode zu sorgen und andererseits eine verbrauchte Elektrode leicht wieder aufwickeln zu können, ist die Vorratsspule in der Corotrondrahtkassette mit einem Federelement verbunden, das z.B. eine Spiralfeder sein kann.By arranging a replaceable corotron wire cassette in a cassette holder of the device, in which the corotron wire is wound on a supply spool, the corotron wire can be easily changed over the cassette in the event of wear, without the wire having to be touched. In order on the one hand to pre-tension the wire-shaped upper electrode and on the other hand to be able to wind up a used electrode easily again, the supply spool in the corotron wire cassette is connected to a spring element which e.g. can be a coil spring.

Um die drahtförmige Elektrode hinsichtlich ihrer Länge an verschiedene Papierbreiten anpassen zu können, ist in der coronaerzeugenden Einrichtung eine elektromotorisch betriebene Einstellvorrichtung vorgesehen, die über ein Halteelement das Ende der drahtförmigen Elektrode an der Kassette erfaßt und in Abhängigkeit von der zu verarbeitenden Papierbreite aus der Kasette zieht.In order to be able to adapt the length of the wire-shaped electrode to different paper widths, an electric motor-operated setting device is provided in the corona-producing device, which detects the end of the wire-shaped electrode on the cassette via a holding element and pulls it out of the cassette depending on the paper width to be processed .

Bei einer vorteilhaften Ausführungsform der Erfindung kann das Halteelement Teil eines Reinigungselementes z.B. eines Abstreifelementes sein, daß dazu dient, den die drahtförmige Elektrode aufnehmenden Bereich der coronaerzeugenden Einrichtung zu reinigen. Zu diesem Zweck wird über eine elektromotorische Einrichtung ein Reinigungsschieber mit der darin eingehängten, drahtförmigen Elektrode von der coronaerzeugenden Einrichtung hin- und herbewegt.In an advantageous embodiment of the invention, the holding element can be part of a cleaning element e.g. of a scraper element that serves to clean the area of the corona-producing device that receives the wire-shaped electrode. For this purpose, a cleaning slide with the wire-shaped electrode suspended therein is moved back and forth from the corona-producing device via an electromotive device.

Bei diesem Hin- und Herbewegen wird die drahtförmige Elektrode durch eine in der Corotrondrahtkassette angeordnete Reinigungseinrichtung in Form von zwei Filzringen hindurchgeführt. Damit ist sowohl eine Reinigung des Corotrondrahtes als auch seine Einstellung auf verschiedene Längen und eine Reinigung des Aufnahmebereiches des Corotrondrahtes der coronaerzeugenden Einrichtung über eine einzige elektromotorische Einrichtung möglich. Die gesamte coronaerzeugende Einrichtung wirkt deshalb hinsichtlich Wartung und Bedienbarkeit besonders einfach was insgesamt die Servicefreundlichkeit und Bedienbarkeit des elektrofotografischen Druck- oder Kopiergerätes wesentlich erhöht.During this back and forth movement, the wire-shaped electrode is passed through a cleaning device in the form of two felt rings arranged in the corotron wire cassette. This makes it possible to clean the corotron wire as well as to adjust it to different lengths and to clean the receiving area of the corotron wire of the corona-producing device by means of a single electromotive device. The entire corona-producing device therefore appears particularly simple in terms of maintenance and operability, which overall increases the ease of servicing and operability of the electrophotographic printing or copying device.

Eine Ausführungsform der Erfindung ist in den Zeichnungen dargestellt und wird im folgenden beispielsweise näher beschrieben. Es zeigen

  • Fig. 1 eine schematische Darstellung der coronaerzeugenden Einrichtung in einer Umdruckstation eines nichtmechanischen Druckgerätes mit einer automatischen Einstelleinrichtung zum Einstellen der Länge des Corotrondrahtes,
  • Fig. 2 eine Darstellung der Corotrondrahtkassette im geöffneten Zustand teilweise im Schnitt,
  • Fig. 3 eine Schnittdarstellung der Corotrondrahtkassette entlang der Schnittlinie 111-111 der Fig. 2 und
  • Fig. 4 eine Schnittdarstellung der Corotrondrahtkassette entlang der Schnittlinie IV-IV der Fig. 2.
An embodiment of the invention is shown in the drawings and is described in more detail below, for example. Show it
  • 1 is a schematic representation of the corona generating device in a transfer printing station of a non-mechanical printing device with an automatic setting device for setting the length of the corotron wire,
  • 2 shows an illustration of the corotron wire cassette in the open state, partly in section,
  • Fig. 3 is a sectional view of the corotron wire cassette along the section line 111-111 of Fig. 2 and
  • 4 is a sectional view of the corotron wire cassette along the section line IV-IV of FIG. 2.

In der Umdruckstation eines nach dem Prinzip der Elektrofotografie arbeitenden Druckgerätes wie es z.B. in der US-PS 3 634 077 beschrieben ist, ist eine coronaerzeugende Einrichtung vorgesehen. Die coronaerzeugende Einrichtung erstreckt sich entlang einer Fotoleitertrommel 10. Sie besteht aus einem schwenkbar ausgeführten Rahmen 11 mit einem daran ausgebildeten Führungskanal 12 zur Aufnahme eines Reinigungsschiebers 13, der mit Hilfe einer motorischen Einrichtung aus einem Getriebemotor 14 mit zugehöriger Abtasteinrichtung 15 über Seilrollen 16 in den Führungskanal 12 bewegt werden kann. Über die Seilrollen 16 ist ein Seil 17 gespannt, daß mit seinem einen Teil an dem Reinigungsschieber 13 befestigt ist. An einer Seite des Rahmens 11 ist eine auswechselbar ausgestaltete Corotrondrahtkassette 18 verrastet, die die drahtförmige Elektrode 19 (Fig. 2) der coronaerzeugenden Einrichtung aufnimmt.A corona-generating device is provided in the transfer printing station of a printing device operating on the principle of electrophotography, as described, for example, in US Pat. No. 3,634,077. The corona-producing device extends along a photoconductor drum 10. It consists of a pivotable frame 11 with a guide channel 12 formed thereon for receiving a cleaning slide 13 which, with the help of a motorized device, consists of a geared motor 14 with an associated scanning device 15 can be moved via pulleys 16 in the guide channel 12. A rope 17 is tensioned over the rope pulleys 16, with one part being attached to the cleaning slide 13. A replaceable corotron wire cassette 18, which receives the wire-shaped electrode 19 (FIG. 2) of the corona-producing device, is latched on one side of the frame 11.

Die Corotrondrahtkassette besteht aus einem Plastikgehäuse 20, aus zwei Halbschalen die zusammengeklebt werden können. In dem Plastikgehäuse 20 ist drehbar befestigt eine Vorratsspule 21 zur Aufnahme der aus Wolframdraht von ca. 0.08 mm Durchmesser bestehenden drahtförmigen Elektrode 19. Die Spule 21 hat einen seitlichen Einschnitt 22 über den der Anfang des Wolframdrahtes aus der Spule herausgeführt ist und über eine Schraube 23 auf der Vorratsspule 21 fixiert ist. In die Vorratsspule 21 eingebaut ist eine spiralförmige Rückstellfeder 24, die mit ihrem einen Ende 25 an der Vorratsspule 21 befestigt ist und mit ihrem anderen Ende 26 über z.B. ein Klemmstück auf einem Ansatz des Gehäuses 20, der z.B. auch als Nabe zur Aufnahme der Drehachse der Vorratsspule 21 dienen kann. Unterhalb der Vorratsspule 21 ist einer Ecke des Plastikgehäuses 20 der Corotrondrahtkassette eine Umlenkrolle 27 für die drahtförmige Elektrode drehbar befestigt. Auf der Umlenkrolle 27 sind zwei Filzringe 28 angeordnet, zwischen denen die drahtförmige Elektrode (Corotrondraht) durchgeführt ist.The corotron wire cassette consists of a plastic housing 20, of two half-shells that can be glued together. A supply coil 21 is rotatably fastened in the plastic housing 20 for receiving the wire-shaped electrode 19 consisting of tungsten wire of approximately 0.08 mm in diameter. The coil 21 has a lateral incision 22 via which the beginning of the tungsten wire is led out of the coil and via a screw 23 is fixed on the supply spool 21. Installed in the supply spool 21 is a spiral return spring 24, which is attached at one end 25 to the supply spool 21 and with its other end 26 via e.g. a clamping piece on an extension of the housing 20, which e.g. can also serve as a hub for receiving the axis of rotation of the supply spool 21. Below the supply spool 21, a deflection roller 27 for the wire-shaped electrode is rotatably attached to a corner of the plastic housing 20 of the corotron wire cassette. Two felt rings 28 are arranged on the deflection roller 27, between which the wire-shaped electrode (corotron wire) is passed.

Im unteren Teil der Corotrondrahtkassette 18 sind in einer Ausnehmung 29 Führungen 30 zur Aufnahme einer Kupplungslasche (Einhängelasche) 31 vorgesehen. Die über einen Befestigungspunkt 32 mit dem Corotrondraht fest verbundene Kupplungslasche ist frei in den Führungen 30 geführt und weist eine Aufnahmeöffnung 33 zur Aufnahme eines als Rastelement ausgebildeten Haltelements 34 des Reinigungsschiebers 13 auf. Weiters befindet sich zwischen der Ausnehmung 29 und dem die Umlenkrolle 27 aufnehmende Teil der Corotrondrahtkassette eine von dem Corotrondraht 19 durchzogene Aussparung 35 zur Aufnahme eines den Corotrondraht 19 kontaktierenden Schleifkontaktes 36.In the lower part of the corotron wire cassette 18, guides 30 are provided in a recess 29 for receiving a coupling tab (hanging tab) 31. The coupling tab, which is firmly connected to the corotron wire via a fastening point 32, is guided freely in the guides 30 and has a receiving opening 33 for receiving a retaining element 34 of the cleaning slide 13, which is designed as a latching element. Furthermore, between the recess 29 and the part of the corotron wire cassette which receives the deflection roller 27 there is a cutout 35 which is penetrated by the corotron wire 19 for receiving a sliding contact 36 which contacts the corotron wire 19.

Zur Steuerung der Bewegung des Reinigungsschiebers 13 und damit zum Herausziehen des Corotrondrahtes 19 aus der Corotrondrahtkassette 18 ist eine Steuereinrichtung 37 vorgesehen, die in Wirkverbindung mit der Abtasteinrichtung 15 und dem Getriebemotor 14 steht. Die Steuer einrichtung 37 enthält eine eigentliche Eingabeeinrichtung 38. Diese Eingabeeinrichtung kann z.B. aus einem Drehknopf bestehen oder aus einer digitalen Tastatur, über die die Breite des zu bearbeitenden Papieres eingegeben wird. In Abhängigkeit von der Breite des einzugebenden Papieres wird dann die drahtförmige Elektrode 19 aus der Corotrondrahtkassette 18 herausgezogen. Zu diesem Zwecke wird die in einer Vergleichseinrichtung 39 eingegebene gewünschte Breite des Papieres, und damit die Ausziehlänge des Corotrondrahtes 19 mit der tatsächlichen Ausziehlänge des Corotrondrahtes 19, und damit die Position des Reinigungsschiebers 13, hergeleitet von der Abtasteinrichtung 15, miteinander verglichen und damit der z.B. als Schrittmotor ausgebildete Getriebemotor 14 angesteuert. Es ist auch möglich, anstelle der direkten Eingabe über die Eingabeeinrichtung 38 die Eingabeeinrichtung 38 mit Papierbreitenverstelleinrichtung so zu kombinieren, daß bei Verstellung der Papierbreite automatisch entsprechende Signale der Eingabevorrichtung 38 zugeleitet werden.To control the movement of the cleaning slide 13 and thus to pull the corotron wire 19 out of the corotron wire cassette 18, a control device 37 is provided which is in operative connection with the scanning device 15 and the geared motor 14. The control device 37 contains an actual input device 38. This input device can e.g. consist of a rotary knob or a digital keyboard, via which the width of the paper to be processed is entered. Depending on the width of the paper to be entered, the wire-shaped electrode 19 is then pulled out of the corotron wire cassette 18. For this purpose, the desired width of the paper entered in a comparison device 39, and thus the pull-out length of the corotron wire 19 with the actual pull-out length of the corotron wire 19, and thus the position of the cleaning slide 13, derived from the scanning device 15, are compared with one another and thus the e.g. Geared motor 14 designed as a stepper motor. Instead of direct input via the input device 38, it is also possible to combine the input device 38 with the paper width adjustment device in such a way that corresponding signals are automatically fed to the input device 38 when the paper width is adjusted.

Zum Betrieb einer derartigen coronaerzeugenden Einrichtung wird zunächst in eine z.B. federnd ausgebildete Kassettenaufnahme des Rahmens 11, die Corotrondrahtkassette 18 eingeschoben bis sie in der Kassettenaufnahme 40 einrastet. Der Reinigungsschieber 13 befindet sich dabei in der linken Anschlagstellung der Fig. 1. Die Haltenase des Halteelementes 34 greift in die Aufnahmeöffnung 33 der Kupplungslasche 31 der Corotrondrahtkassette 18 ein. Zugleich wird der Corotron draht 19 über den Schleifkontakt 36 kontaktiert und bedarfsweise mit der entsprechenden Coronaspannung beaufschlagt.For the operation of such a corona generating device, a e.g. resilient cassette holder of the frame 11, the corotron wire cassette 18 inserted until it snaps into the cassette holder 40. The cleaning slide 13 is in the left stop position of FIG. 1. The retaining lug of the retaining element 34 engages in the receiving opening 33 of the coupling tab 31 of the corotron wire cassette 18. At the same time, the Corotron wire 19 is contacted via the sliding contact 36 and, if necessary, applied with the corresponding Corona voltage.

Entsprechend der über die Steueranordnung 37 eingestellten Papierbreite wird dann der Corotrondraht 19 von dem Reinigungsschieber 13 entgegen der Kraft der Rückstellfeder 24 aus der Corotrondrahtkassette 18 gezogen.Corresponding to the paper width set via the control arrangement 37, the corotron wire 19 is then pulled out of the corotron wire cassette 18 by the cleaning slide 13 against the force of the return spring 24.

Bei einer durch die Steuereinrichtung 37 aufrufbaren Reinigungsprozedur wird der Reinigungsschieber 13 zum Reinigen des Corotrondrahtes 19 und des Führungskanales 12 (Umdruckschiene) über die Länge des Führungskanales hin- und herbewegt. Bei diesem Hin- und Herbewegen erfolgt gleichzeitig die Reinigung des Corotrondrahtes 19 durch die beiden Filzringe 28, zwischen denen der Corotrondraht 19 hindurchbewegt wird. Ist der Corotrondraht 19 verbraucht und soll deswegen die Corotrondrahtkassette 18 ausgewechselt werden, wird der Reinigungsschieber 13 wieder in seine Ruhestellung am linken Anschlag des Führungskanales 12 bewegt. Dadurch ist die Corotronkassette 18 entriegelt und sie kann zum Auswechseln in einfacher Weise aus der Kassettenaufnahme 14 entnommen werden.In a cleaning procedure that can be called up by the control device 37, the cleaning slide 13 is moved back and forth over the length of the guide channel for cleaning the corotron wire 19 and the guide channel 12 (transfer printing rail). During this back and forth movement, the corotron wire 19 is simultaneously cleaned by the two felt rings 28, between which the corotron wire 19 is moved. If the corotron wire 19 is used up and the corotron wire cassette 18 is to be replaced for this reason, the cleaning slide 13 is moved back into its rest position at the left stop of the guide channel 12. As a result, the corotron cassette 18 is unlocked and it can be removed from the cassette holder 14 in a simple manner for replacement.

Claims (12)

1. Corona-generating device for electrophotographic printing or copying machines comprising a wire-shaped electrode (19) arranged at a distance from a photoconductor (10), characterized by a corotron wire case (18) mounted exchangeably in a case receptacle (40) of the machine in order to receive the wire-shaped electrode (19) in a manner such that it can be withdrawn from the case into an operating position and relowered for exchanging the case.
2. Corona-generating device according to Claim 1, characterized in that there is arranged in the corotron wire case (18) a dispensing reel (21), which receives the wire-shaped electrode (19) and co-operates with a return device (24) which automatically rewinds the wire-shaped electrode (19).
3. Corona-generating device according to Claim 2, characterized in that the return device has as a mechanical energy storage mechanism a spring element (24) engaging with the dispensing reel (21).
4. Corona-generating device according to one of Claims 1 to 3, characterized in that the corona wire case (18) has a cleaning device (28) for the wire-shaped electrode (19).
5. Corona-generating device according to Claim 4, characterized in that the wire-shaped electrode (19) is guided over a deflector reel (27) having a cleaning felt.
6. Corona-generating device according to one of Claims 4 or 5, characterized in that the wire-shaped electrode (19) is guided between two felt rings (28).
7. Corona-generating device according to one of Claims 1 to 6, characterized in that in order to receive a sliding contact (36) which contacts the wire-shaped electrode (19), the corotron wire case (18) has a cutout (35) pierced by the wire-shaped electrode (19).
8. Corona-generating device according to one of Claims 1 to 7, characterized in that the corotron wire case (18) is produced from an electrically insulating material, preferably plastic.
9. Corona-generating device according to one of Claims 1 to 8, characterized in that the Corona-generating device has a setting device (37), which makes it possible, depending upon the paper width to be processed by the machine, to draw the wire-shaped electrode (19) to a pre-determined length from the corotron wire case (18).
10. Corona-generating device according to Claim 9, characterized in that the setting device (37) has an electromotive drive device (14, 15) for a retaining element (34) gripping the end of the wire-shaped electrode (19).
11. Corona-generating device according to Claim 10, characterized in that the retaining element (34) is arranged on a cleaning element (13), which can be moved by the electromotive drive device (14) through the zone (12) of the Corona-generating device which receives the wire-shaped electrode (19).
12. Corona-generating device according to one of Claim 10 or 11, characterized in that in order to receive the retaining element (34), the end of the wire-shaped electrode (19) is joined to a link plate (31) mounted so that it can be withdrawn from the corotron wire case (18).
EP86116173A 1985-11-25 1986-11-21 Corotron wire case for electrophotographic printing or copying machines Expired EP0224820B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3541592 1985-11-25
DE3541592 1985-11-25

Publications (2)

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EP0224820A1 EP0224820A1 (en) 1987-06-10
EP0224820B1 true EP0224820B1 (en) 1989-08-30

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ID=6286749

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EP86116173A Expired EP0224820B1 (en) 1985-11-25 1986-11-21 Corotron wire case for electrophotographic printing or copying machines

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US (1) US4746796A (en)
EP (1) EP0224820B1 (en)
JP (1) JPH0664392B2 (en)
DE (1) DE3665366D1 (en)

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US4946626A (en) * 1988-06-14 1990-08-07 Union Camp Corporation Corrosion inhibitors
EP0465125A2 (en) * 1990-06-27 1992-01-08 Xerox Corporation Corotron restringing tool
WO1999024263A1 (en) 1997-11-10 1999-05-20 Oce Printing Systems Gmbh Method and device for conveying a pre-printed striplike recording medium in a printing device
US6318916B1 (en) 1997-11-10 2001-11-20 OCé PRINTING SYSTEMS GMBH Method and control for conveying a striplike recording medium with marginal perforation in a printer

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JP2541978B2 (en) * 1987-04-27 1996-10-09 キヤノン株式会社 Wire cartridge and destaticizer
US4885466A (en) * 1987-09-25 1989-12-05 Ricoh Company, Ltd. Corona wire cleaning device utilizing a position detection system
US5337131A (en) * 1992-11-12 1994-08-09 Indigo N.V. Charging apparatus operative to charge a surface
DE19537610C1 (en) * 1995-10-09 1997-04-10 Oce Printing Systems Gmbh Transport device for corotron in electrographic printer or copier
US5761578A (en) * 1996-04-08 1998-06-02 Moore Business Forms, Inc. Corona wire cleaning by mechanical vibration of the wire
US5862440A (en) * 1997-04-11 1999-01-19 Moore Business Forms, Inc. Toner delivery device
US6294782B1 (en) * 1999-03-26 2001-09-25 Nexpress Solutions Llc Corona charger with a serpentine strung corona wire
US6947237B2 (en) * 2001-10-09 2005-09-20 Hewlett-Packard Development Company, L.P. WORM magnetic tape with cartridge memory system and method
JP4833885B2 (en) * 2006-04-21 2011-12-07 株式会社リコー Corona wire cartridge, corona discharger, and image forming apparatus using the same
JP2012108437A (en) * 2010-11-19 2012-06-07 Canon Inc Corona discharge device, and image forming apparatus

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US4946626A (en) * 1988-06-14 1990-08-07 Union Camp Corporation Corrosion inhibitors
EP0465125A2 (en) * 1990-06-27 1992-01-08 Xerox Corporation Corotron restringing tool
EP0465125A3 (en) * 1990-06-27 1992-05-20 Xerox Corporation Corotron restringing tool
WO1999024263A1 (en) 1997-11-10 1999-05-20 Oce Printing Systems Gmbh Method and device for conveying a pre-printed striplike recording medium in a printing device
US6256474B1 (en) 1997-11-10 2001-07-03 Oce Printing Systems Gmbh Method and device for conveying a pre-printed striplike recording medium in a printing device
US6318916B1 (en) 1997-11-10 2001-11-20 OCé PRINTING SYSTEMS GMBH Method and control for conveying a striplike recording medium with marginal perforation in a printer

Also Published As

Publication number Publication date
JPS62131274A (en) 1987-06-13
DE3665366D1 (en) 1989-10-05
EP0224820A1 (en) 1987-06-10
JPH0664392B2 (en) 1994-08-22
US4746796A (en) 1988-05-24

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