EP0221281B1 - Dispositif pour purger un mélange de développement comprenant un composant magnétique d'une unité de développement d'une machine à imprimer non mécanique ou d'une machine à copier - Google Patents

Dispositif pour purger un mélange de développement comprenant un composant magnétique d'une unité de développement d'une machine à imprimer non mécanique ou d'une machine à copier Download PDF

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Publication number
EP0221281B1
EP0221281B1 EP86112151A EP86112151A EP0221281B1 EP 0221281 B1 EP0221281 B1 EP 0221281B1 EP 86112151 A EP86112151 A EP 86112151A EP 86112151 A EP86112151 A EP 86112151A EP 0221281 B1 EP0221281 B1 EP 0221281B1
Authority
EP
European Patent Office
Prior art keywords
developer
mixture
magnetic
exhaust opening
developer mixture
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
EP86112151A
Other languages
German (de)
English (en)
Other versions
EP0221281A1 (fr
Inventor
Manfred Ing.-Grad. Neufeld
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
Publication of EP0221281A1 publication Critical patent/EP0221281A1/fr
Application granted granted Critical
Publication of EP0221281B1 publication Critical patent/EP0221281B1/fr
Expired 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
    • G03G15/0844—Arrangements for purging used developer from the developing unit
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/10—Collecting or recycling waste developer
    • G03G21/105—Arrangements for conveying toner waste

Definitions

  • the invention relates to a device according to the preamble of patent claim 1.
  • charge images on a charge image carrier for. B. a photoconductor drum and then colored with a black powder (toner) in a developer station.
  • a black powder toner
  • 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. B. by means of a magnetic brush arrangement past the charge pattern, to which the toner particles, caused by electrostatic forces, remain adherent.
  • Such a developer station is e.g. B. from DE-B-21 66 667 known.
  • a device for removing the developer mixture from a developer station of an electrographic 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 drain opening.
  • a device for removing a developer mixture containing a magnetic component from a developer station of an electrophotographic device is known.
  • the discharge opening for the developer mixture to be replaced is located on a side section of the developer housing. It can be closed and opened manually with a foam-covered plate.
  • US-A-4,082,061 describes a suction device for removing the developer mixture from the developer station.
  • a method for continuous mixture change using a closure device made of a combination of electromagnets and permanent magnets is known from US-A-4,380,309.
  • the object of the invention is to design a device of the type mentioned at the outset in such a way that the developer mixture can be removed completely, quickly and without risk of contamination of the environment from the developer station.
  • a channel-like emptying opening which extends over the width of the developer station and in the vicinity of which a magnetic closure device is arranged.
  • the magnetic closure device is designed in such a way that its activated magnetic field in the region of the discharge opening forms a plug of developer mixture which closes the discharge opening.
  • the emptying opening is opened and the developer mixture is completely sucked out of the developer station by negative pressure by means of a suction device connected to the emptying opening.
  • the magnetic closure device has a magnetic strip, which can either consist of a permanent magnet or an electromagnet.
  • a permanent magnet When using a permanent magnet, the closure device for opening and closing the emptying opening is pivoted on or off the emptying opening.
  • the carrier particles made of ferromagnetic material form a graft which reliably prevents the developer mixture from escaping from the developer station.
  • the magnetic bar is simply pivoted away or deactivated by switching off the current when using an electromagnet.
  • This opens the discharge opening and a vacuum generating device in the form of a blower can quickly develop the developer and vacuum safely from the developer station.
  • the emptying opening is advantageously arranged downstream of a cylindrical air collector in which the suctioned developer mixture is swirled and which primarily serves to ensure a uniform pressure profile along the emptying opening. This enables the developer mixture to be removed quickly and reliably from the developer station.
  • the closed emptying system means there is no danger of pollution to the environment. This also applies to unintentional actuation of the magnetic locking device if no safety measures are provided for this. Emptying is extremely quick and safe.
  • a collection container for residual toner already present in the electrophotographic printing device can advantageously be used in the device. No additional drive is required to remove the developer mixture, since the developer mixture is removed solely by means of negative pressure.
  • a usable mixture is sucked into a toner bottle in the collecting container, from which it can be refilled into the developer station when changing the mixture.
  • the entire device can be integrated in a simple manner in a cost-effective and space-saving manner in the developer station.
  • a developer station 10 is adjacent to a charge image carrier 11, e.g. B. 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 with the aid of a magnet roller arrangement made of a rotating hollow cylinder 14 with 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 z. B. impact-resistant plastic, which extends according to the width of the photoconductor drum in the axial direction along this photoconductor drum 11.
  • At the bottom of the housing there is an emptying opening in the form of a flat channel 17 which, for. B. has a clear width of about 3 mm.
  • a permanent magnet strip 18 extending over the length of the emptying opening is arranged in the region of this emptying opening designed as a flat channel. It can consist of a barium ferrite magnet that has pole plates on both sides and z. B. has a quality value (energy product (B - H) max ) of approximately 20 kJ / m 3 .
  • the permanent magnet strip 18 can be pivoted to and away from the area of the emptying opening via an electromotive device 20 as shown in FIG. 2.
  • a cylindrical air collector 21 is arranged downstream of the gap-shaped emptying opening (flat duct 17). It consists of a cylindrical tube which extends along the emptying opening (flat duct 17) over the entire width of the developer station. Instead of the cylindrical air collector, a conical air collector can also be used, the largest diameter of which is located in the vicinity of the air outlet opening 22. This changes the flow conditions favorably and the air collector can be easily manufactured using the injection molding process.
  • the air collector 21 is connected to a cyclone filter 23 via a flexible pipeline 22.
  • the cyclone filter 23 is detachably placed on a collecting container 24 for the developer mixture. Downstream of the cyclone filter is a filter 25, which in turn is connected to a blower 26 generating a vacuum.
  • a silencer 27 is located at the air outlet area of the blower 26.
  • the entire device now works as follows.
  • the developer station is filled with developer mixture and, as shown in FIGS. 1 and 2, the permanent magnet strip 18 is pivoted onto the flat channel 17. Due to its magnetic field in the area of the flat channel 17, which has an average height of only about 3 mm, the permanent magnetic strip 18 produces a plug of ferromagnetic carrier particles which prevent the developer mixture from escaping from the flat channel.
  • the permanent magnet strip 18 is simply pivoted away from the region of the flat channel 17 with the aid of the motor device 20.
  • the flat channel 17 serving as an emptying opening for the developer mixture is thus released and the developer mixture can flow in a spiral spiral shape into the cylindrical air collector 21, which has an approximate diameter of 45 mm, due to the negative pressure having a water column of approximately 100 mm.
  • the swirled developer mixture 13 flows after leaving the air collector via the pipeline 22 into the cyclone filter 23, in which it settles because of the radial flow of the air developer mixture in the cyclone filter.
  • the developer mixture falls out of the cyclone filter into the collecting container 24. Only small residues of the developer mixture penetrate into the fine filter 25, which catches this small remaining amount of developer mixture.
  • a permanent magnetic strip made of barrium ferrite with pole faces on both sides is used.
  • an electromagnet instead of this permanent magnet strip 18, which is activated if necessary.
  • the electromagnet can be composed of individual magnetic elements. This also applies to the construction of a permanent magnetic strip.
  • developer mixture 13 is fed from a storage container 28 to the actual mixture container 30 of the developer station via a feed channel 29.
  • a magnetic closure device is assigned to the feed channel 29 and consists of two magnetic elements in the form of magnetic strips 33 and 34 that can be pivoted on and off separately via motors 31 and 32.
  • the magnetic strips 33 and 34 are arranged at a distance from one another.
  • the flat channel 17 already described.
  • a further magnetic locking device which can be pivoted on and off separately from two by means of motors 35 and 36 Magnetic elements in the form of magnetic strips 37 and 38, which are also arranged at a distance from each other.
  • the magnetic strips 33, 34, 37 and 38 are controlled by a microprocessor-controlled control device MCU via switches S1 and S2.
  • the magnetic strip pairs are controlled in such a way that the magnetic strips 33 and 34 or 37 and 38 alternately contact the corresponding channels 29 and 17.
  • This developer mixture builds up on the swiveled-in magnetic strip 34.
  • the first magnetic strip 33 is then swiveled in again and the second magnetic strip 34 swiveled out.
  • the developer mixture stowed in the feed channel 29 can thus fall into the actual mixture container 30.
  • This type of feed enables a metered addition of fresh developer mixture.
  • the developer mixture is removed from the developer station and fed to the air collector 21.
  • microprocessor-controlled control device MCU controls the access and the outflow of developer mixture to the developer station in such a way that small amounts of the mixture present in the developer station are removed via the magnetic strips 37 and 38 in relatively short time intervals and that these mixture amounts are then in each case replaced by the same new mixture amounts from the Storage container 28 are replaced via the magnetic strips 33 and 34.
  • the average age can be calculated using the rule of thumb:
  • Average age (days) total mixed quantity / changing quantity / day.
  • a sensor SN is arranged in the mixture container 30.
  • B. can be part of a light barrier or can be designed as a capacitive or inductive sensor or as an ultrasonic sensor. This sensor is necessary because, in practice, the quantity of mixture supplied and discharged can never be set 100% the same.
  • the microprocessor-controlled control unit MCU now regulates the supply of the Ent in dependence on the level of the developer mixture in the mixture container 30 detected by the sensor SN winder mixture through the feed channel 29 and the emptying of the developer mixture via the flat channel 17 in such a way that a uniform level is established in the mixture container 30 of the developer mixture.
  • the storage area 28 is designed as an exchangeable storage container, the exchange can take place during the printing operation.
  • the entire developer station is reduced to a minimum volume because the large amounts of developer that would otherwise be required for longer maintenance intervals are eliminated.
  • the toner consumption is controlled according to criteria such as operating hours and toner consumption via the continuous mixture change.
  • electromagnets can also be arranged which can be controlled alternately.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Sustainable Development (AREA)
  • Dry Development In Electrophotography (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)

Claims (10)

1. Dispositif pour évacuer un mélange de développement (13) contenu dans un composant magnétique, d'un poste de développement (10) d'une machine mécanique d'impression ou de copiage, le poste de développement (10) comportant, au niveau de son fond, une ouverture de vidage en forme de canal (17), qui s'étend sur la largeur du poste de développement, caractérisé par le fait qu'au voisinage de l'ouverture de vidage (10) se trouve disposé un dispositif de fermeture magnétique (18) agencé de manière que son champ magnétique crée, à l'état activé, dans la zone de l'ouverture de vidage (17), un bouchon formé par le mélange de développement (13) et obturant l'ouverture de vidage, et qui libère l'ouverture de vidage (17) à l'état désactivé, et qu'un dispositif d'aspiration (26) est disposé en aval de l'ouverture de vidage.
2. Dispositif selon la revendication 1, caractérisé par le fait que le dispositif de fermeture possède un barreau aimanté (18) qui s'étend sur la largeur de l'ouverture de vidage (17).
3. Dispositif suivant la revendication 2, caractérisé par le fait que le barreau aimanté (18) est constitué par un barreau formé d'un aimant permanent et est agencé de manière à pouvoir être rapproché et écarté de l'ouverture de vidage (17) par pivotement.
4. Dispositif suivant la revendication 2, caractérisé par le fait que le barreau aimanté (17) est réalisé sous la forme d'un électroaimant.
5. Dispositif suivant l'une des revendications 1 à 4, caractérisé par le fait que le dispositif d'aspiration (26) possède un collecteur d'air cylindrique ou conique (21) qui s'étend sur la largeur de l'ouverture de vidage (17) et en aval duquel est disposé un ventilateur (26).
6. Dispositif suivant la revendication 5, caractérisé par un récipient (24) de collecte du mélange de développement (13), auquel est associé un filtre à cyclone (23) traversé par l'air et le mélange de développement.
7. Dispositif suivant l'une des revendications 5 ou 6, caractérisé par un filtre fin (25) monté en amont du ventilateur (25).
8. Procédé pour régénérer un mélange de développement (13) contenant un composant magnétique, dans un poste de développement (10) d'une machine non mécanique d'impression ou de copiage, moyennant l'utilisation d'un dispositif selon la revendication, remarquable par les caractéristiques suivantes :
a) pour l'obtention d'un remplacement continu du mélange, de petites quantités du mélange de développement (13) sont prélevées du poste de développement (10), à des intervalles de temps pouvant être prédéterminés, sous la commande d'un dispositif magnétique de fermeture (37, 38) ;
b) les quantités du mélange de développement frais, correspondant aux quantités prélevées. sont envoyées depuis un réservoir (28) au poste de développement (10) à des intervalles de temps pouvant être prédéterminés, sous la commande d'un autre dispositif magnétique de fermeture (33, 34).
9. Procédé selon la revendication 8, caractérisé par le fait que le niveau du mélange de développement est détecté au moyen d'un capteur (SN) et qu'il est prévu un dispositif de régulation (MCU, S1, S2), qui commande les dispositifs magnétiques de fermeture (33, 34, 37, 38) conformément aux variations du niveau du mélange de développement.
10. Dispositif suivant l'une des revendications 1 ou 8, caractérisé par le fait que les dispositifs magnétiques de fermeture comportent chacun au moins deux éléments magnétiques (33, 34 ; 37, 38) pouvant être actionnés séparément et disposés à distance l'un de l'autre.
EP86112151A 1985-10-09 1986-09-02 Dispositif pour purger un mélange de développement comprenant un composant magnétique d'une unité de développement d'une machine à imprimer non mécanique ou d'une machine à copier Expired EP0221281B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3536080 1985-10-09
DE3536080 1985-10-09

Publications (2)

Publication Number Publication Date
EP0221281A1 EP0221281A1 (fr) 1987-05-13
EP0221281B1 true EP0221281B1 (fr) 1988-11-30

Family

ID=6283201

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86112151A Expired EP0221281B1 (fr) 1985-10-09 1986-09-02 Dispositif pour purger un mélange de développement comprenant un composant magnétique d'une unité de développement d'une machine à imprimer non mécanique ou d'une machine à copier

Country Status (4)

Country Link
US (1) US4932355A (fr)
EP (1) EP0221281B1 (fr)
JP (1) JPS6292968A (fr)
DE (1) DE3661335D1 (fr)

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US4891673A (en) * 1988-08-04 1990-01-02 Xerox Corporation Development system
US5095338A (en) * 1991-02-21 1992-03-10 Xerox Corporation Developer which discharges used carrier particles using a magnetic valve
JP2865451B2 (ja) * 1991-07-29 1999-03-08 シャープ株式会社 画像形成装置
US5243388A (en) * 1991-09-05 1993-09-07 Xerox Corporation System for cleaning the developer unit in an electronic reprographic printing system
JPH05150627A (ja) * 1991-11-29 1993-06-18 Sharp Corp 現像装置
JPH08502369A (ja) * 1992-10-22 1996-03-12 シーメンス ニクスドルフ インフオルマチオーンスジステーメ アクチエンゲゼルシヤフト 電子写真式の印刷装置または複写装置に用いられるニューマチック式のトナーフィード装置
US5355199A (en) * 1993-09-24 1994-10-11 Xerox Corporation Development unit for an electrophotographic printer having a torque-triggered outlet port
DE4412206C1 (de) * 1994-04-08 1995-08-31 Siemens Nixdorf Inf Syst Vorrichtung zum Transport eines elektrostatisch aufladbaren Entwicklergemisches in einem elektrografischen Druck- oder Kopiergerät
DE4416168C1 (de) * 1994-05-06 1995-11-23 Siemens Nixdorf Inf Syst Vorrichtung zum Schutz einer Entwicklerstation eines elektrografischen Druck- oder Kopiergerätes
US5839485A (en) * 1995-10-12 1998-11-24 Xerox Corporation Electromagnetic valve and demagnetizing circuit
DE19602127C1 (de) * 1996-01-22 1997-04-17 Oce Printing Systems Gmbh Entwicklerstation mit mehreren nebeneinander angeordneten Entwicklerkammern
US5699842A (en) * 1996-04-12 1997-12-23 Xerox Corporation Magnetic filling and mixing apparatus and processes thereof
EP0807866A1 (fr) * 1996-05-17 1997-11-19 Agfa-Gevaert N.V. Dispositif de développement électrostatographique comprenant un réservoir de dosage de toner
US5685348A (en) * 1996-07-25 1997-11-11 Xerox Corporation Electromagnetic filler for developer material
DE19643653B4 (de) * 1996-10-22 2004-10-07 OCé PRINTING SYSTEMS GMBH Einrichtung zum Austauschen von Träger eines Zweikomponenten-Entwicklers in elektrofotografischen Druck- und Kopiereinrichtungen
US5761577A (en) * 1997-02-13 1998-06-02 Xerox Corporation Method and apparatus for removing toner waste from a toner sump
US5909829A (en) * 1997-04-01 1999-06-08 Xerox Corporation Vibratory filler for powders
US6196278B1 (en) 1997-04-01 2001-03-06 Xerox Corporation Powder filling utilizing vibrofluidization
US5947169A (en) * 1997-04-01 1999-09-07 Xerox Corporation Oscillating valve for powders
US5921295A (en) * 1997-09-03 1999-07-13 Xerox Corporation High speed nozzle for toner filling systems
US6102088A (en) * 1997-09-03 2000-08-15 Xerox Corporation Vacuum valve shutoff for particulate filling system
US6056025A (en) * 1997-09-03 2000-05-02 Xerox Corporation High speed air nozzle for particulate filling system
EP0928743A1 (fr) 1998-01-08 1999-07-14 Xerox Corporation Vanne pneumatique pour systèmes de remplissage de toner
US5950868A (en) * 1998-08-06 1999-09-14 Xerox Corporation Eccentric nozzle for powder filling systems
US5950869A (en) * 1998-08-06 1999-09-14 Xerox Corporation Pivoting nozzle for powder filling systems
US6024141A (en) * 1998-10-15 2000-02-15 Xerox Corporation Particulate processing apparatus
JP3847985B2 (ja) * 1998-11-04 2006-11-22 キヤノン株式会社 トナー補給容器の再生方法
US6098677A (en) * 1999-09-10 2000-08-08 Xerox Corporation High speed air nozzle with mechanical valve for particulate systems
DE102011010071B4 (de) * 2011-02-01 2014-10-02 Wolfgang Penc Farbfixierungssystem

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US3784297A (en) * 1970-03-11 1974-01-08 Canon Kk Photocopying machine
US3632019A (en) * 1970-05-26 1972-01-04 John F Harm Level control system for flowable solid materials
US3764208A (en) * 1970-12-29 1973-10-09 Canon Kk Developing device for use in electrophotographic copying machines
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US4058086A (en) * 1976-05-11 1977-11-15 Xerox Corporation Emission controller for development apparatus
US4082061A (en) * 1977-03-14 1978-04-04 Xerox Corporation Multi-color development system
US4205911A (en) * 1977-08-10 1980-06-03 Xerox Corporation Cleaning system
JPS56102875A (en) * 1980-01-21 1981-08-17 Canon Inc Developer replenishing device
DE3117229C2 (de) * 1981-04-30 1983-05-11 Siemens AG, 1000 Berlin und 8000 München Vorrichtung zur Entfernung des Entwicklergemisches aus einer Entwicklerstation einer elektrografischen Einrichtung
JPS5887577A (ja) * 1981-11-20 1983-05-25 Ricoh Co Ltd 複写機におけるクリ−ニング装置
US4459012A (en) * 1982-04-05 1984-07-10 Eastman Kodak Company Cleaning station air diverters
US4439034A (en) * 1982-12-20 1984-03-27 International Business Machines Corporation Method and apparatus for purging a copier developer
GB2150052B (en) * 1983-11-24 1987-05-28 Ricoh Kk Developer supply system for electrophotographic copier
JPS60201374A (ja) * 1984-03-27 1985-10-11 Fuji Xerox Co Ltd トナ−回収装置

Also Published As

Publication number Publication date
JPS6292968A (ja) 1987-04-28
DE3661335D1 (en) 1989-01-05
US4932355A (en) 1990-06-12
EP0221281A1 (fr) 1987-05-13

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