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EP0249971A1 - Magnetic shut-off and transport device for non-mechanical printing and copying machines - Google Patents

Magnetic shut-off and transport device for non-mechanical printing and copying machines Download PDF

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Publication number
EP0249971A1
EP0249971A1 EP87108720A EP87108720A EP0249971A1 EP 0249971 A1 EP0249971 A1 EP 0249971A1 EP 87108720 A EP87108720 A EP 87108720A EP 87108720 A EP87108720 A EP 87108720A EP 0249971 A1 EP0249971 A1 EP 0249971A1
Authority
EP
European Patent Office
Prior art keywords
magnetic
developer
roller
transport channel
transport
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.)
Granted
Application number
EP87108720A
Other languages
German (de)
French (fr)
Other versions
EP0249971B1 (en
Inventor
Mehmet Ali Dipl.-Ing. Büyükgüclü (FH)
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to AT87108720T priority Critical patent/ATE56284T1/en
Publication of EP0249971A1 publication Critical patent/EP0249971A1/en
Application granted granted Critical
Publication of EP0249971B1 publication Critical patent/EP0249971B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • 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
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0822—Arrangements for preparing, mixing, supplying or dispensing developer
    • G03G15/0844—Arrangements for purging used developer from the developing unit

Definitions

  • the invention relates to a magnetic device for a non-mechanical printing or copying device according to the preamble of claim 1.
  • charge images are stored on a charge image carrier e.g. generated by a photoconductor drum and then colored with a black powder (toner) in a developer station.
  • a charge image carrier e.g. generated by a photoconductor drum and then colored with a black powder (toner) in a developer station.
  • the toner images are then transferred to plain paper and fixed there.
  • a two-component developer consisting of ferromagnetic carrier particles and toner particles is used for development.
  • the developer mixture is e.g. is guided past the charge pattern by means of a magnetic brush arrangement, to which the toner particles, caused by electrostatic forces, adhere.
  • Such a developer station is e.g. known from DE-AS 21 26 667.
  • US-PS 37 64 208 a device for removing the developer mixture from a developer known station of an electrophotographic facility.
  • This device contains a developer roller and a mixing screw, at the end of which the drain opening with a tube for connecting a bottle for receiving the developer mixture is arranged in the bottom of the developer station.
  • the direction of rotation of the mixing screw and the developer roller is reversed in order to transport the developer mixture to the outlet opening.
  • a developer station for an electrophotographic device in which a magnetic device is arranged as a closure device between a storage area and the actual transport area of the developer station.
  • the magnetic device consists of a rotatably mounted permanent magnet which can be pivoted onto the actual passage for the developer mixture. In the pivoted state, a plug of developer mixture forms in the passage channel, which closes the channel.
  • the object of the invention is to design a device of the type mentioned at the beginning such that both a closure of the transport channel is possible and a metered transport of the developer mixture in the transport channel.
  • the developer mixture should be sealed and transported with the greatest possible mechanical protection of the mixture.
  • a transport channel e.g. the connecting channel between the actual developer station and a collecting container can be arranged, a rotatable roller containing a magnetic strip is arranged, one wall of the transport channel with the roller forming a narrow retention gap and the other wall of the transport channel with the roller forming a substantially wider transport gap the transport channel can be closed without contact in a simple manner; on the other hand, the toner can be transported in a metered manner in the transport channel via the roller.
  • a squeegee is arranged in the entry area of the retention gap.
  • the developer mixture can be removed from the developer station in a quick and gentle manner.
  • the device can be used, for example, to feed developer mixture in doses to the developer station.
  • the figure shows a schematic representation of the magnetic closure and transport device in the developer station of an electrophotographic printing device, partly in a sectional view.
  • a developer station 10 is adjacent to a charge image carrier 11, e.g. a photoconductor drum.
  • the developer station 10 contains, for example, a paddle wheel 12 for mixing a two-component developer mixture of ferromagnetic carrier particles and the actual toner particles coloring the charge carrier 11.
  • the mixed developer mixture 13 is brought into the surroundings of the photoconductor drum 11 with the aid of a magnetic roller arrangement made of a rotating hollow cylinder 14 with permanent magnets 15 fixedly arranged therein.
  • the entire mixing and transport devices for the toner are motor-driven in a known manner, which is not shown in detail here.
  • the developer station consists of a trough-like housing 16, made of, for example, impact-resistant plastic, which extends in the axial direction along this photoconductor drum 11 in accordance with the width of the photoconductor drum.
  • a rotatable roller 18 is contained which can be driven electrically by an electric motor 17.
  • This rotatable roller 18 contains a permanent magnet strip 19 which extends over the entire length of the roller 16 and which, for example, can also be formed from individual permanent magnet strip segments. It can consist of a barium ferrite magnet.
  • the roller 19 is arranged within an emptying opening forming a transport channel in such a way that one wall of the transport channel forms a narrow retaining gap 20 with the roller and the other wall of the transport channel with the roller forms a substantially wider transport gap 21.
  • a squeegee 22 At the entrance of the retaining gap 19 there is a squeegee 22 provided.
  • a receptacle 23 is fastened via a fastening device 24 below the emptying opening.
  • the collecting container 23 can e.g. consist of an elastic bag-like container which is attached to the emptying opening via corresponding spring clips 24.
  • the entire device now works as follows.
  • the developer station is filled with developer mixture and the roller 18 with its magnetic strip 19 arranged thereon is in the position shown in the figure.
  • a plug of ferromagnetic carrier particles is formed in the transport nip 21 in the vicinity of the north pole of the roller 18, which prevents the developer mixture from escaping from the developer station.
  • the roller 18 is rotated in a simple manner with the aid of the motor device 17.
  • the speed of rotation of the roller 18 or the size of its circumference in connection with the clear width of the transport gap 21 determines the transport capacity of the developer mixture in the transport channel. Any developer particles adhering to the roller 18 are stripped off by the scraper strip 22.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
  • Electrophotography Configuration And Component (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)

Abstract

A magnetic mechanism is provided for a non-mechanical printer or copier device comprising a conveying channel through which a developer mix including magnetic components contained therein flows, so that a plug of developer mix is generated via the magnetic mechanism for closing the conveying channel. The conveying channel contains a rotatable drum containing a magnetic strip and the drum is arranged in the conveying channel such that the one wall of the conveying channel forms a narrow retaining gap together with the drum and the other wall of the conveying channel forms a significantly broader conveying gap together with the drum.

Description

Die Erfindung betrifft eine magnetische Vorrichtung für ein nichtmechanisches Druck- oder Kopiergerät gemäß dem Oberbegriff des Patentanspruches 1.The invention relates to a magnetic device for a non-mechanical printing or copying device according to the preamble of claim 1.

In der Kopiergerätetechnik und bei nichtmechanischen Da­tenschnelldruckern, die nach dem Prinzip der Elektro­fotografie arbeiten, werden Ladungsbilder auf einem La­dungsbildträger z.B. einer Fotoleitertrommel erzeugt und anschließend mit einem schwarzen Pulver (Toner) in einer Entwicklerstation eingefärbt. Die Tonerbilder werden bei Verwendung einer Fotoleitertrommel anschließend auf Nor­malpapier übertragen und dort fixiert. In der Regel wird zum Entwickeln ein Zweikomponentenentwickler verwendet, der aus ferromagnetischen Trägerteilchen und Tonerteilchen besteht. Das Entwicklergemisch wird z.B. mittels einer Ma­gnetbürsten-Anordnung am Ladungsbild vorbeigeführt, an dem die Tonerteilchen, verursacht durch elektrostatische Kräfte haften bleiben. Eine derartige Entwicklerstation ist z.B. aus der DE-AS 21 26 667 bekannt.In copier technology and in non-mechanical high-speed data printers that work on the principle of electrophotography, charge images are stored on a charge image carrier e.g. generated by a photoconductor drum and then colored with a black powder (toner) in a developer station. When using a photoconductor drum, the toner images are then transferred to plain paper and fixed there. Typically, a two-component developer consisting of ferromagnetic carrier particles and toner particles is used for development. The developer mixture is e.g. is guided past the charge pattern by means of a magnetic brush arrangement, to which the toner particles, caused by electrostatic forces, adhere. Such a developer station is e.g. known from DE-AS 21 26 667.

Da das Entwicklergemisch im Laufe der Zeit seine tribo­elektrischen Eigenschaften verliert, muß es am Ende seiner Lebensdauer gegen ein neues Entwicklergemisch ausgetauscht werden. Dieser Austausch des Entwicklergemisches muß ein­fach durchzuführen sein.Since the developer mixture loses its triboelectric properties over time, it must be replaced with a new developer mixture at the end of its service life. This exchange of the developer mixture must be easy to carry out.

Es ist weiters aus der US-PS 37 64 208 eine Vorrichtung zur Entfernung des Entwicklergemisches aus einer Entwick­ lerstation einer elektrofotografischen Einrichtung bekannt. Diese Vorrichtung enthält eine Entwicklerwalze und eine Mischschnecke, an deren Ende im Boden der Ent­wicklerstation die Ablauföffnung mit einem Rohr zum An­schluß einer Flasche zur Aufnahme des Entwicklergemisches angeordnet ist. Zur Entfernung des Entwicklergemisches wird die Drehrichtung von Mischschnecke und der Entwick­lerwalze umgesteuert, um das Entwicklergemisch zur Ab­lauföffnung zu transportieren.It is also from US-PS 37 64 208 a device for removing the developer mixture from a developer known station of an electrophotographic facility. This device contains a developer roller and a mixing screw, at the end of which the drain opening with a tube for connecting a bottle for receiving the developer mixture is arranged in the bottom of the developer station. To remove the developer mixture, the direction of rotation of the mixing screw and the developer roller is reversed in order to transport the developer mixture to the outlet opening.

Bei derartigen Vorrichtungen besteht die Gefahr, daß im Bereich des Austrittsrohres unbeabsichtigt Gemisch aus­fließen kann. Beim Anschließen und Entfernen der Flasche besteht Verschmutzungsgefahr für die Umgebung. Eine voll­ständige Entleerung ist nicht möglich, da die Schnecke und der zugehörige Schneckenkanal immer einen definierten Ab­stand zueinander haben müssen. Der gesamte Entleerungs­vorgang dauert relativ lange. An den Schnecken können sich erfahrungsgemäß Tonerverfestigungen bilden, die abplatzen können.With such devices, there is a risk that mixture may unintentionally flow out in the area of the outlet pipe. When connecting and removing the bottle, there is a risk of environmental pollution. Complete emptying is not possible since the screw and the associated screw channel must always be at a defined distance from one another. The entire emptying process takes a relatively long time. Experience has shown that toner solidifications can form on the screws, which can flake off.

Es ist weiters aus der US-PS 39 30 466 eine Entwickler­station für eine elektrofotografische Einrichtung bekannt, bei der als Verschlußeinrichtung zwischen einem Vorratsbe­reich und dem eigentlichen Transportbereich der Entwick­lerstation eine magnetische Vorrichtung angeordnet ist. Die magnetische Vorrichtung besteht aus einem drehbar ge­lagerten Dauermagneten, der an den eigentlichen Durch­trittskanal für das Entwicklergemisch anschwenkbar ist. Im angeschwenkten Zustand bildet sich im Durchtrittskanal ein Pfropf aus Entwicklergemisch, der den Kanal ver­schließt.It is also known from US-PS 39 30 466 a developer station for an electrophotographic device, in which a magnetic device is arranged as a closure device between a storage area and the actual transport area of the developer station. The magnetic device consists of a rotatably mounted permanent magnet which can be pivoted onto the actual passage for the developer mixture. In the pivoted state, a plug of developer mixture forms in the passage channel, which closes the channel.

Mit einer derartigen magnetischen Vorrichtung ist allein eine Unterbrechung des Entwicklergemisches im Transport­kanal möglich.With such a magnetic device, it is only possible to interrupt the developer mixture in the transport channel.

Aufgabe der Erfindung ist es, eine Vorrichtung der ein­gangs genannten Art so auszugestalten, daß sowohl ein Ver­schluß des Transportkanales möglich ist als auch ein do­sierter Transport des Entwicklergemisches im Transportka­nal. Das Verschließen und der Transport des Entwicklerge­misches sollte bei größtmöglichster mechanischer Schonung des Gemisches erfolgen.The object of the invention is to design a device of the type mentioned at the beginning such that both a closure of the transport channel is possible and a metered transport of the developer mixture in the transport channel. The developer mixture should be sealed and transported with the greatest possible mechanical protection of the mixture.

Diese Aufgabe wird bei einer Vorrichtung der eingangs ge­nannten Art gemäß dem kennzeichnenden Teil des Patentan­spruches 1 gelöst.This object is achieved in a device of the type mentioned at the outset according to the characterizing part of patent claim 1.

Vorteilhafte Ausführungsformen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous embodiments of the invention are characterized in the subclaims.

Dadurch, daß in einem Transportkanal der z.B. der Verbin­dungskanal zwischen der eigentlichen Entwicklerstation und einem Auffangbehälter sein kann, eine drehbare um eine magnetische Leiste enthaltende Walze angeordnet ist, wobei eine Wand des Transportkanales mit der Walze einen engen Rückhaltespalt und die andere Wand des Transportkanales mit der Walze einen wesentlich breiteren Transportspalt bildet, läßt sich in einfacher Weise der Transportkanal berührungslos verschließen, andererseits läßt sich der Toner in dem Transportkanal über die Walze dosiert transportieren.The fact that in a transport channel e.g. the connecting channel between the actual developer station and a collecting container can be arranged, a rotatable roller containing a magnetic strip is arranged, one wall of the transport channel with the roller forming a narrow retention gap and the other wall of the transport channel with the roller forming a substantially wider transport gap the transport channel can be closed without contact in a simple manner; on the other hand, the toner can be transported in a metered manner in the transport channel via the roller.

Bei einer vorteilhaften Ausführungsform der Erfindung ist im Eintrittsbereich des Rückhaltespaltes eine Abstreif­leiste angeordnet.In an advantageous embodiment of the invention, a squeegee is arranged in the entry area of the retention gap.

Mit einer derartigen Einrichtung läßt sich in schneller und schonender Weise das Entwicklergemisch aus der Ent­wicklerstation entfernen. Außerdem läßt sich die Vorrich­tung dazu verwenden, um z.B. Entwicklergemisch dosiert der Entwicklerstation zuzuführen.With such a device, the developer mixture can be removed from the developer station in a quick and gentle manner. In addition, the device can be used, for example, to feed developer mixture in doses to the developer station.

Eine Ausführungsform der Erfindung ist in der Zeichnung dargestellt und wird im folgenden beispielsweise näher be­schrieben.An embodiment of the invention is shown in the drawing and is described in more detail below, for example.

Die Figur zeigt eine schematische Darstellung der magne­tischen Verschluß- und Transportvorrichtung in der Ent­wicklerstation einer elektrofotografischen Druckeinrich­tung teilweise in Schnittdarstellung.The figure shows a schematic representation of the magnetic closure and transport device in the developer station of an electrophotographic printing device, partly in a sectional view.

In einer nach dem Prinzip der Elektrofotografie arbei­tenden Druckeinrichtung ist eine Entwicklerstation 10 be­nachbart zu einem Ladungsbildträger 11, z.B. einer Foto­leitertrommel, angeordnet. Die Entwicklerstation 10 ent­hält beispielsweise ein Schaufelrad 12 zum Durchmischen eines aus zwei Komponenten bestehenden Entwicklergemisches aus ferromagnetischen Trägerteilchen und den eigentlichen den Ladungsträger 11 einfärbenden Tonerteilchen. Zum Ein­färben der Fotoleitertrommel wird das durchgemischte Ent­wicklergemisch 13 mit Hilfe einer Magnetwalzenanordnung aus einem rotierenden Hohlzylinder 14 mit darin fest ange­ordneten Dauermagneten 15 in die Umgebung der Fotoleiter­trommel 11 gebracht. Die gesamten Misch- und Transport­einrichtungen für den Toner sind in bekannter Weise moto­risch angetrieben, was hier nicht im einzelnen dargestellt ist.In a printing device operating on the principle of electrophotography, a developer station 10 is adjacent to a charge image carrier 11, e.g. a photoconductor drum. The developer station 10 contains, for example, a paddle wheel 12 for mixing a two-component developer mixture of ferromagnetic carrier particles and the actual toner particles coloring the charge carrier 11. For coloring the photoconductor drum, the mixed developer mixture 13 is brought into the surroundings of the photoconductor drum 11 with the aid of a magnetic roller arrangement made of a rotating hollow cylinder 14 with permanent magnets 15 fixedly arranged therein. The entire mixing and transport devices for the toner are motor-driven in a known manner, which is not shown in detail here.

Die Entwicklerstation besteht aus einem trogartigen Ge­häuse 16, aus z.B. schlagfesten Kunststoff, das sich ent­sprechend der Breite der Fotoleitertrommel in axialer Richtung entlang dieser Fotoleitertrommel 11 erstreckt. Am Boden des Gehäuses 16 befindet sich eine Entleeröffnung, indem über einen Elektromotor 17 elektrisch antreibbar eine drehbare Walze 18 enthalten ist. Diese drehbare Walze 18 enthält eine Dauermagnetleiste 19, die sich über die gesamte Länge der Walze 16 erstreckt und die z.B. auch aus einzelnen Dauermagnetleistsegmenten ausgebildet sein kann. Sie kann aus einem Barium-Ferritmagneten bestehen.The developer station consists of a trough-like housing 16, made of, for example, impact-resistant plastic, which extends in the axial direction along this photoconductor drum 11 in accordance with the width of the photoconductor drum. At the bottom of the housing 16 there is an emptying opening in which a rotatable roller 18 is contained which can be driven electrically by an electric motor 17. This rotatable roller 18 contains a permanent magnet strip 19 which extends over the entire length of the roller 16 and which, for example, can also be formed from individual permanent magnet strip segments. It can consist of a barium ferrite magnet.

Die Walze 19 ist innerhalb während einer Transportkanal bildenden Entleeröffnung so angeordnet, daß die eine Wand des Transportkanales mit der Walze einen engen Rückhalte­spalt 20 bildet und die andere Wand des Transportkanales mit der Walze einen wesentlich breiteren Transportspalt 21. Am Eingang des Rückhaltespaltes 19 ist eine Abstreif­leiste 22 vorgesehen.The roller 19 is arranged within an emptying opening forming a transport channel in such a way that one wall of the transport channel forms a narrow retaining gap 20 with the roller and the other wall of the transport channel with the roller forms a substantially wider transport gap 21. At the entrance of the retaining gap 19 there is a squeegee 22 provided.

Zur Aufnahme des aus der Entwicklerstation 10 entfernten Entwicklergemisches 13 ist unterhalb der Entleeröffnung ein Aufnahmebehälter 23 über eine Befestigungseinrichtung 24 befestigt. Der Auffangbehälter 23 kann z.B. aus einem elastischen sackartigen Behälter bestehen, der über ent­sprechende Federklammern 24 an der Entleeröffnung be­festigt ist.To receive the developer mixture 13 removed from the developer station 10, a receptacle 23 is fastened via a fastening device 24 below the emptying opening. The collecting container 23 can e.g. consist of an elastic bag-like container which is attached to the emptying opening via corresponding spring clips 24.

Die gesamte Vorrichtung arbeitet nun wie folgt. Im nor­malen Betrieb der elektrofotografischen Druckeinrichtung ist die Entwicklerstation mit Entwicklergemisch gefüllt und die Walze 18 mit ihrer darauf angeordneten Magnet­leiste 19 befindet sich in der in der Figur dargestellten Position. Dadurch wird im Transportspalt 21 in der Um­gebung des mit N bezeichneten Nordpoles der Walze 18 ein Pfropf aus ferromagnetischen Trägerteilchen gebildet, der ein Austreten des Entwicklergemisches aus der Entwickler­station verhindert.The entire device now works as follows. In normal operation of the electrophotographic printing device, the developer station is filled with developer mixture and the roller 18 with its magnetic strip 19 arranged thereon is in the position shown in the figure. As a result, a plug of ferromagnetic carrier particles is formed in the transport nip 21 in the vicinity of the north pole of the roller 18, which prevents the developer mixture from escaping from the developer station.

Soll mit der beschriebenen Vorrichtung das Entwicklerge­misch 13 aus der Entwicklerstation entfernt werden, so wird in einfacher Weise mit Hilfe der motorischen Einrich­tung 17 die Walze 18 gedreht. Die Umdrehungsgeschwindig­keit der Walze 18 bzw. die Größe ihres Umfanges bestimmt dabei in Verbindung mit der lichten Weite des Transport­spaltes 21 die Transportkapazität des Entwicklergemisches in dem Transportkanal. Eventuell an der Walze 18 anhaf­tende Entwicklerpartikelchen werden von der Abstreiflei­ste 22 abgestreift.If the developer mixture 13 is to be removed from the developer station with the device described, the roller 18 is rotated in a simple manner with the aid of the motor device 17. The speed of rotation of the roller 18 or the size of its circumference in connection with the clear width of the transport gap 21 determines the transport capacity of the developer mixture in the transport channel. Any developer particles adhering to the roller 18 are stripped off by the scraper strip 22.

Anstelle des flexiblen Behälters 23 ist es auch möglich einen festen Behälter anzuordnen, der mit einem Sammel­behälter über eine Saugeinrichtung in Verbindung steht. Es können in dem Behälter auch Transportschnecken angeordnet sein oder aber das in dem Behälter angesammelte Entwickler­gemisch wird durch Unterdruck über eine Saugeinrichtung entfernt.Instead of the flexible container 23, it is also possible to arrange a fixed container which is connected to a collecting container via a suction device. Transport screws can also be arranged in the container or the developer mixture accumulated in the container is removed by negative pressure via a suction device.

Claims (4)

1. Magnetische Vorrichtung für ein nichtmechanisches Druck- oder Kopiergerät mit einem Transportkanal durch den ein Entwicklergemisch (13) mit darin enthaltender magne­tischer Komponente fließt, wobei zum Verschließen des Transportkanales über die magnetische Vorrichtung (18) ein Pfropf aus Entwicklergemisch erzeugt wird,
gekennzeichnet durch eine drehbare, eine magnetische Leiste (19) enthaltende Walze (18) die in dem die Walze umschließenden Transportkanal derart angeordnet ist, daß die eine Wand des Transportkanales mit der Walze (18) einen engen Rückhaltespalt (19) und die andere Wand des Transportkanales mit der Walze (18) einen wesentlich breiteren Transportspalt (21) bildet.1. Magnetic device for a non-mechanical printing or copying device with a transport channel through which a developer mixture (13) with the magnetic component contained therein flows, a plug of developer mixture being generated to close the transport channel via the magnetic device (18),
characterized by a rotatable roller (18) containing a magnetic strip (18) which is arranged in the transport channel surrounding the roller such that one wall of the transport channel with the roller (18) has a narrow retention gap (19) and the other wall of the Transport channel with the roller (18) forms a much wider transport gap (21). 2. Magnetische Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß am Ein­trittsbereich des Rückhaltespaltes (19) eine Abstreif­leiste (22) angeordnet ist.2. Magnetic device according to claim 1,
characterized in that a scraper strip (22) is arranged at the entry area of the retention gap (19). 3. Magnetische Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die magnetische Vorrichtung zum Entfernen des Entwickler­gemisches am Boden einer Entwicklerstation (10) des nicht­mechanischen Druck- oder Kopiergerätes angeordnet ist.3. Magnetic device according to one of claims 1 or 2, characterized in that the magnetic device for removing the developer mixture is arranged at the bottom of a developer station (10) of the non-mechanical printing or copying machine. 4. Magnetische Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die magnetische Leiste aus mehreren Einzelmagneten zu­sammengesetzt ist.4. Magnetic device according to one of claims 1 to 3, characterized in that the magnetic bar is composed of several individual magnets.
EP87108720A 1986-06-20 1987-06-16 Magnetic shut-off and transport device for non-mechanical printing and copying machines Expired - Lifetime EP0249971B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87108720T ATE56284T1 (en) 1986-06-20 1987-06-16 MAGNETIC CLOSING AND TRANSPORT DEVICE FOR NON-MECHANICAL PRINTING AND COPYING EQUIPMENT.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3620751 1986-06-20
DE3620751 1986-06-20

Publications (2)

Publication Number Publication Date
EP0249971A1 true EP0249971A1 (en) 1987-12-23
EP0249971B1 EP0249971B1 (en) 1990-09-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108720A Expired - Lifetime EP0249971B1 (en) 1986-06-20 1987-06-16 Magnetic shut-off and transport device for non-mechanical printing and copying machines

Country Status (5)

Country Link
US (1) US4775874A (en)
EP (1) EP0249971B1 (en)
JP (1) JPS636583A (en)
AT (1) ATE56284T1 (en)
DE (1) DE3764721D1 (en)

Cited By (1)

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EP0354030A2 (en) * 1988-08-04 1990-02-07 Xerox Corporation Development system

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US4907032A (en) * 1987-07-31 1990-03-06 Minolta Camera Kabushiki Kaisha Monocomponent developing device
US5300988A (en) * 1991-06-07 1994-04-05 Eastman Kodak Company Toning station for selectively applying toner to an electrostatic image
US5555184A (en) * 1994-08-29 1996-09-10 Xerox Corporation Developer roller assembly and method for making same
US7542703B2 (en) * 2002-05-20 2009-06-02 Ricoh Company, Ltd. Developing device replenishing a toner or a carrier of a two-ingredient type developer and image forming apparatus including the developing device
US7116928B2 (en) * 2002-12-18 2006-10-03 Ricoh Company, Ltd. Powder discharging device and image forming apparatus using the same

Citations (3)

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Publication number Priority date Publication date Assignee Title
US3927640A (en) * 1974-04-29 1975-12-23 Xerox Corp Developer shut-off apparatus
US3930466A (en) * 1974-04-29 1976-01-06 Xerox Corporation Segmented gate developer flow controller
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EP0354030A3 (en) * 1988-08-04 1991-10-23 Xerox Corporation Development system

Also Published As

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US4775874A (en) 1988-10-04
EP0249971B1 (en) 1990-09-05
DE3764721D1 (en) 1990-10-11
ATE56284T1 (en) 1990-09-15
JPS636583A (en) 1988-01-12

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