EP0249971B1 - Installation de blocage et de transport magnétique pour machines à imprimer et à copier non mécaniques - Google Patents

Installation de blocage et de transport magnétique pour machines à imprimer et à copier non mécaniques Download PDF

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Publication number
EP0249971B1
EP0249971B1 EP87108720A EP87108720A EP0249971B1 EP 0249971 B1 EP0249971 B1 EP 0249971B1 EP 87108720 A EP87108720 A EP 87108720A EP 87108720 A EP87108720 A EP 87108720A EP 0249971 B1 EP0249971 B1 EP 0249971B1
Authority
EP
European Patent Office
Prior art keywords
conveying channel
magnetic
developer
drum
roller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87108720A
Other languages
German (de)
English (en)
Other versions
EP0249971A1 (fr
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/de
Publication of EP0249971A1 publication Critical patent/EP0249971A1/fr
Application granted granted Critical
Publication of EP0249971B1 publication Critical patent/EP0249971B1/fr
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-B 21 66 667.
  • a device for removing the developer mixture from a developer station of an electrophotographic 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.
  • 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 bar 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 in a simple manner without contact; 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 also be used to e.g. The developer mixture is metered into 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 developer mixture consisting of two components 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 corresponds to the width of the photoconductor drum extends in the axial direction along this photoconductor drum 11.
  • 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 can also be formed, for example, from individual permanent magnet strip segments. It can consist of a barium ferrite magnet.
  • the roller 18 is arranged within an emptying opening forming the 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 20 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 gap 21 in the vicinity of the north pole of the roller 18, which plug 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.

Landscapes

  • 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)

Claims (4)

1. Dispositif magnétique pour machines non mécaniques d'impression ou de reprographie comportant un conduit de transport dans lequel circule un mélange de développement (13) contenant un composant magnétique, et dans lequel un bouchon formé par le mélange de développement est produit par l'intermédiaire du dispositif magnétique (18) de manière à fermer le conduit de transport, caractérisé par un cylindre rotatif (18) qui contient une barrette magnétique (19) et est disposé dans le conduit de transport entourant le cylindre de telle sorte qu'une paroi du conduit de transport forme, avec le cylindre (18), une fente étroite de retenue (1) et que l'autre paroi du conduit de transport forme, avec le cylindre (18), une fente de transport nettement plus large (21).
2. Dispositif magnétique suivant la revendication 1, caractérisé par le fait qu'une racle (22) est disposée dans la zone d'entrée de la fente de retenue (20).
3. Dispositif magnétique suivant l'une des revendications 1 ou 2, caractérisé par le fait que le dispositif magnétique (18) est disposé dans le fond d'un poste de développement (10) de la machine non mécanique d'impression ou de reprographie.
4. Dispositif magnétique suivant l'une des revendications 1 à 3, caractérisé par le fait que la barrette magnétique est formée par la réunion de plusieurs aimants individuels.
EP87108720A 1986-06-20 1987-06-16 Installation de blocage et de transport magnétique pour machines à imprimer et à copier non mécaniques Expired - Lifetime EP0249971B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87108720T ATE56284T1 (de) 1986-06-20 1987-06-16 Magnetische verschluss- und transporteinrichtung fuer nicht-mechanische druck- und kopiergeraete.

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 EP0249971A1 (fr) 1987-12-23
EP0249971B1 true EP0249971B1 (fr) 1990-09-05

Family

ID=6303368

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87108720A Expired - Lifetime EP0249971B1 (fr) 1986-06-20 1987-06-16 Installation de blocage et de transport magnétique pour machines à imprimer et à copier non mécaniques

Country Status (5)

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

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4907032A (en) * 1987-07-31 1990-03-06 Minolta Camera Kabushiki Kaisha Monocomponent developing device
US4891673A (en) * 1988-08-04 1990-01-02 Xerox Corporation Development system
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

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3333566A (en) * 1963-05-06 1967-08-01 American Photocopy Equip Co Developer system for electrostatographic machines
GB1197801A (en) * 1966-09-23 1970-07-08 Ricoh Kk Apparatus for Electrophotography.
US3764208A (en) * 1970-12-29 1973-10-09 Canon Kk Developing device for use in electrophotographic copying machines
US3717122A (en) * 1971-03-01 1973-02-20 Xerox Corp Magnetic gate
US3712266A (en) * 1971-08-20 1973-01-23 Ibm Developer conveying apparatus
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
US3954331A (en) * 1974-11-20 1976-05-04 Xerox Corporation Toner dispenser
JPS5210146A (en) * 1975-07-15 1977-01-26 Hitachi Metals Ltd Magnetic brush development device
US4226525A (en) * 1976-10-19 1980-10-07 Ricoh Company, Ltd. Electrostatic copying machine
JPS57148773A (en) * 1981-03-10 1982-09-14 Fuji Xerox Co Ltd Toner mixer for developing 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
JPS59150768A (ja) * 1983-02-18 1984-08-29 Oki Electric Ind Co Ltd ラインサ−マルヘツドの駆動方法
GB2150052B (en) * 1983-11-24 1987-05-28 Ricoh Kk Developer supply system for electrophotographic copier

Also Published As

Publication number Publication date
US4775874A (en) 1988-10-04
JPS636583A (ja) 1988-01-12
DE3764721D1 (de) 1990-10-11
ATE56284T1 (de) 1990-09-15
EP0249971A1 (fr) 1987-12-23

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