EP0043505A2 - Dispositif pour l'échange de révélateur contenu dans un poste de développement - Google Patents

Dispositif pour l'échange de révélateur contenu dans un poste de développement Download PDF

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Publication number
EP0043505A2
EP0043505A2 EP81104894A EP81104894A EP0043505A2 EP 0043505 A2 EP0043505 A2 EP 0043505A2 EP 81104894 A EP81104894 A EP 81104894A EP 81104894 A EP81104894 A EP 81104894A EP 0043505 A2 EP0043505 A2 EP 0043505A2
Authority
EP
European Patent Office
Prior art keywords
developer
tube
station
rotating body
bore
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.)
Withdrawn
Application number
EP81104894A
Other languages
German (de)
English (en)
Other versions
EP0043505A3 (fr
Inventor
Hubert Ing. Grad. Mugrauer
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 EP0043505A2 publication Critical patent/EP0043505A2/fr
Publication of EP0043505A3 publication Critical patent/EP0043505A3/fr
Withdrawn legal-status Critical Current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
    • 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
    • G03G15/0877—Arrangements for metering and dispensing developer from a developer cartridge into the development unit

Definitions

  • the invention relates to a device for exchanging developers located in a developer station, which is used for developing charge images applied to an intermediate carrier in printing or copying devices.
  • Printing and copying devices operating according to the electrostatic principle are known (see, for example, US Pat. No. 3,331,592).
  • an intermediate carrier e.g. a drum with an electrophotographic layer generates charge images of the characters to be printed.
  • the charge images then arrive at a developer station, in which the charge images are developed and thus made visible.
  • a developer mixture is used for the development, which contains toner particles which are attracted to the intermediate carrier by the charge images.
  • the developed charge images are printed on a recording medium, e.g. a paper web, and fixed there.
  • Two-component developers are mainly used to develop the charge patterns.
  • a major disadvantage of this technology is the drop in print quality during the developer life due to the aging of the developer mixture. In order to avoid an excessive drop in print quality, the entire developer has been replaced at certain maintenance intervals. However, this cannot prevent the print quality from starting at a certain point during operation value keeps falling.
  • the object on which the invention is based is to specify a device with the aid of which a uniformly good print quality can be achieved.
  • This object is achieved in a device of the type specified above in that two dosing devices are provided, one of which continuously supplies fresh developer to the developer station and from which the other developer constantly consumes the same amount from the developer station.
  • the metering device can easily consist of a rotating body arranged in a tube. At least one hole is arranged in the rotating body. In one part of the tube subdivided by the rotating body there is a developer mixture which is to be fed to the developer station. Whenever the bore of the rotating body lies under one part of the tube, developer can flow from one part of the tube into the bore and from there into the other part of the tube. The developer is transported from the other part of the tube to the developer station. The amount of fresh toner flowing to the developer station is determined by the size of the bore and the speed of rotation of the rotating body.
  • the metering device with the aid of which developer mixture is removed from the developer station, is constructed in a corresponding manner.
  • the bore does not pass through the rotating body of the metering device.
  • the rotating body is then arranged in an outer body, with only a very small amount of play between the rotating body and the outer body consists.
  • the construction of the device is particularly simple if the reservoir for fresh toner, the tube, the metering device and the developer station are arranged one below the other. Gravity is thus used for the supply of fresh developer to the developer station.
  • the developer station, the tube and the metering device can be arranged one below the other for the removal of used toner from the developer station.
  • a receptacle is provided below the tube for receiving the used developer.
  • a sensor can be arranged in one part of the tube, which detects whether developer is present in the tube.
  • the developer station which is designated by 10
  • the developer station which is designated by 10
  • an intermediate carrier 12 which is implemented as a drum with a photoelectric surface.
  • a developer roller 12 is provided in the developer station 10 and transports developers from the developer station to the intermediate carrier 12 according to the magnetic brush principle. Such developer rollers or magnetic brushes are known.
  • two rollers 14 and 16 are arranged, which are designed as mixing rollers. Their function is to mix the developer mixture constantly.
  • the structure of the mixing rollers 14, 16 is irrelevant for the device according to the invention.
  • a device is arranged, with the aid of which fresh toner can always be supplied in predetermined amounts to the developer station.
  • This device is designated 18.
  • a further device 20 is accordingly arranged below the developer station 10. with the help of which used developers can be removed from the developer station 10 in predetermined quantities.
  • One device 18 contains a storage container 22 in which fresh developer is arranged.
  • the storage container 22 is connected to a tube 24 which is divided into two parts by a dosing device 26.
  • One part 24a of the tube 24 lies between the storage container 22 and the dosing device 26, the other part 24b of the tube 24 lies between the dosing device 26 and the developer station 10.
  • the storage container 22, the tube 24 and the dosing device 26 are arranged one below the other in the exemplary embodiment , so that the supply of fresh developer to the developer station 10 can take place with the aid of gravity.
  • the dosing device 26 determines the amount of developer that can get from one part / of the tube 24 to the other part / of the tube 24 and thus into the developer station 10.
  • a possible structure of the dossing device is shown in Figure 2 and Figure 3.
  • the device 2D which is arranged below the developer station 10 and with which used developer is removed from the developer station, consists of a tube 28 and a metering device 30.
  • the metering device 30 divides the tube 28 into a part 28a and another part 28b.
  • the part 28a of the tube 28 is connected to the developer station 10, the other part 28b of the tube 28 leads to a collecting container 32.
  • gravity is used for the flow of the developer, for this reason the developer station 10 is that Tube 28, the metering device 30 and the collecting container 32 are arranged one below the other.
  • the dosing device 30 in turn determines the amount of used developer that is removed from the developer station 10.
  • FIGS. 2 and 3 A possible construction of the metering device 26, 30 results from FIGS. 2 and 3. It contains a rotating body 34, in which a bore 36 is located.
  • the bore 36 can accommodate a certain developer volume if it is located directly under one part of the tube 24 or 28.
  • the rotating body 34 is rotated, for example, by means of a small synchronous motor at a fixed, low speed. Depending on the size of the bore 36 and the speed of the rotating body 34, the amount of developer can be determined, which flows through the metering device 26 or 30.
  • the amount of developer that can flow through the metering device can be determined particularly precisely if the bore 36 does not completely pass through the rotating body 34.
  • This embodiment is shown in Figure 2.
  • the rotating body 34 lies in an outer body 38 which is fixed.
  • the play between the rotating body 34 and the outer body 38 should be very small, so that the carrier particles cannot get into the bearing gap.
  • the amount of developer that flows through the metering device is determined here by the volume of the bore 36 and the rotational speed of the rotating body 34. It is therefore possible to transport defined small amounts of developer through the metering direction.
  • the outer body 38 is provided with two openings 40 and 40a, which lie opposite one another.
  • One opening, e.g. 40 is with one part of the tube, the other opening, e.g. 40a is connected to the other part of the tube.
  • the openings 40, 40a are required to allow the developer to flow to the bore 36 or the developer to flow out of the bore 36.
  • FIG. 3 shows the structure of the metering device again in a perspective view.
  • the rotating body 34 and the outer body 38 are shown.
  • a motor 42 is shown, which is connected to the rotating body 34.
  • the bore 38 is arranged, with the aid of which the developer quantities are transported from one part of the tube to the other part of the tube.
  • the rotating body 34 with its bore 36 is in the position shown in FIG. 2, then the bore 36 filled with developer. After a rotation of 180 °, the precisely dosed amount of developer taken up is emptied downwards. After the 360 position of the rotating body has been reached, the process begins again.
  • the metering quantity and the frequency can thus be determined via the bore size and the rotating body rotation speed.
  • a sensor 44 can be arranged in the part 24a of the tube 24.
  • the sensor 44 determines whether the part 24a of the tube 24 does not yet contain developer. If this is / will be the case, the reservoir is empty, and 22 have replenished. Since there is still a piece of pipe between the sensor 44 and the metering device 26, when the sensor is displayed there is still a small reserve of developer which is sufficient for the developer to be replaced in the developer station 10 until the operator has refilled the reservoir 22.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Dry Development In Electrophotography (AREA)
EP81104894A 1980-07-02 1981-06-24 Dispositif pour l'échange de révélateur contenu dans un poste de développement Withdrawn EP0043505A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3025103 1980-07-02
DE19803025103 DE3025103A1 (de) 1980-07-02 1980-07-02 Vorrichtung zum austausch von in einer entwicklerstation befindlichem entwickler

Publications (2)

Publication Number Publication Date
EP0043505A2 true EP0043505A2 (fr) 1982-01-13
EP0043505A3 EP0043505A3 (fr) 1982-06-16

Family

ID=6106256

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81104894A Withdrawn EP0043505A3 (fr) 1980-07-02 1981-06-24 Dispositif pour l'échange de révélateur contenu dans un poste de développement

Country Status (4)

Country Link
US (1) US4358196A (fr)
EP (1) EP0043505A3 (fr)
JP (1) JPS5745571A (fr)
DE (1) DE3025103A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10107647A1 (de) * 2001-02-19 2002-09-19 Oce Printing Systems Gmbh Vorrichtung und Verfahren zum Ersatz von gealtertem Entwickler
US7257354B2 (en) 2001-02-19 2007-08-14 Oce Printing Systems Gmbh Device and method for the replacement of out-of-date developer

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5895349A (ja) * 1981-11-30 1983-06-06 Fuji Photo Film Co Ltd 感光性プレ−トの現像補充液補充方法
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
JPH05150627A (ja) * 1991-11-29 1993-06-18 Sharp Corp 現像装置
JP3483087B2 (ja) * 1995-04-14 2004-01-06 株式会社リコー 画像形成システム
US5722017A (en) * 1996-10-04 1998-02-24 Xerox Corporation Liquid developing material replenishment system and method
JP2003195636A (ja) * 2001-12-27 2003-07-09 Canon Inc 現像装置及び画像形成装置

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3882823A (en) * 1973-08-15 1975-05-13 Minolta Camera Kk Stirring and scraping device for developing material
US3928764A (en) * 1972-06-02 1975-12-23 Hoechst Ag Method and apparatus for measuring and controlling the toner concentration in electrophotographic reproduction machines
DE2747014A1 (de) * 1976-10-19 1978-04-27 Ricoh Kk Elektrostatisches kopiergeraet
US4155638A (en) * 1978-03-02 1979-05-22 Eastman Kodak Company Toner concentration monitor

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3331592A (en) * 1965-02-04 1967-07-18 Xerox Corp Xerographic fusing apparatus
US3991709A (en) * 1971-02-09 1976-11-16 Canon Kabushiki Kaisha Regenerating device for developing liquid
US4110029A (en) * 1973-09-27 1978-08-29 Canon Kabushiki Kaisha Liquid developer for an electrostatic copying device
US4166702A (en) * 1975-05-12 1979-09-04 Ricoh Company, Ltd. Device for detecting a toner concentration in a developing solution
JPS5815789B2 (ja) * 1975-10-01 1983-03-28 株式会社リコー デンシシヤシンフクシヤキニオケル オ−トバイアスゲンゾウホウホウ
DE2644216A1 (de) * 1976-09-30 1978-04-06 Agfa Gevaert Ag Entwicklungseinrichtung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3928764A (en) * 1972-06-02 1975-12-23 Hoechst Ag Method and apparatus for measuring and controlling the toner concentration in electrophotographic reproduction machines
US3882823A (en) * 1973-08-15 1975-05-13 Minolta Camera Kk Stirring and scraping device for developing material
DE2747014A1 (de) * 1976-10-19 1978-04-27 Ricoh Kk Elektrostatisches kopiergeraet
US4155638A (en) * 1978-03-02 1979-05-22 Eastman Kodak Company Toner concentration monitor

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10107647A1 (de) * 2001-02-19 2002-09-19 Oce Printing Systems Gmbh Vorrichtung und Verfahren zum Ersatz von gealtertem Entwickler
US7257354B2 (en) 2001-02-19 2007-08-14 Oce Printing Systems Gmbh Device and method for the replacement of out-of-date developer
US7437106B2 (en) 2001-02-19 2008-10-14 Oce Printing Systems Gmbh Device and method for the replacement of expired developer

Also Published As

Publication number Publication date
JPS5745571A (en) 1982-03-15
DE3025103A1 (de) 1982-01-21
US4358196A (en) 1982-11-09
EP0043505A3 (fr) 1982-06-16

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Inventor name: MUGRAUER, HUBERT, ING. GRAD.