EP0008040B1 - Magnetbürsten-Entwicklungsvorrichtung für elektrostatische Ladungsbilder - Google Patents

Magnetbürsten-Entwicklungsvorrichtung für elektrostatische Ladungsbilder Download PDF

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Publication number
EP0008040B1
EP0008040B1 EP79102655A EP79102655A EP0008040B1 EP 0008040 B1 EP0008040 B1 EP 0008040B1 EP 79102655 A EP79102655 A EP 79102655A EP 79102655 A EP79102655 A EP 79102655A EP 0008040 B1 EP0008040 B1 EP 0008040B1
Authority
EP
European Patent Office
Prior art keywords
magnetic brush
doctor blade
magnetic
roller
developer
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
EP79102655A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0008040A1 (de
Inventor
Hartmut Dr. Bock
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.)
Hoechst AG
Original Assignee
Hoechst 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 Hoechst AG filed Critical Hoechst AG
Priority to AT79102655T priority Critical patent/ATE235T1/de
Publication of EP0008040A1 publication Critical patent/EP0008040A1/de
Application granted granted Critical
Publication of EP0008040B1 publication Critical patent/EP0008040B1/de
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
    • G03G15/09—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer using magnetic brush

Definitions

  • the invention relates to a magnetic brush developing device for electrostatic charge images on a photoconductive recording layer, in which a developer of toner and magnetic carrier particles is applied to the charge images on which the toner adheres, and with a doctor blade, which is applied to the magnetic brush roller, the amount of dosed by the magnetic brush roller used for developing carrier particles and is brought up to the end faces of the roller at the roller ends.
  • Such a development device is known from DE-OS 2 436 890, in which the carrier particles of the developer are removed from the photoconductive or dielectric recording layer by the action of magnetic forces after completion of the development process.
  • a magnet which is designed, for example, as a magnetic roller, is arranged at a close distance from the recording layer with the charge images. The distance between the magnet and the recording layer must be such that the carrier particles cannot be pinched between the layer and the magnet.
  • DE-OS 2162 842 describes a cascade development device for an electrostatic copying machine which has a collecting device for removing the carrier particles adhering to the surface of the photoconductor drum.
  • the collecting device consists of a thin elastic material, for example plastic, which does not touch the photoconductor drum and has a collecting edge.
  • the collecting edge of the sealing strip is arranged at an adjustable distance from the photoconductor drum, which corresponds to approximately one tenth to approximately half the carrier particle diameter. Additional wiping devices for the sealing strip are provided as little as a magnetic roller.
  • U.S. Patent 3,884,571 relates to a developing device having a developer wiping device which extends in the form of a trough in the axial direction along a drum immediately below the space between a developing station and the photoconductive recording surface of the drum.
  • the bottom surface of the trough includes an upward angled wiper lip located near the surface of the drum that catches the developer trickling down from the development station.
  • the developer caught in the trough is conveyed to an outlet opening with the aid of an endless belt. There is no provision for the developer to be removed from the photoconductive recording layer by means of a magnetic roller.
  • the object of the invention is to obtain the most uniform possible discharge of carrier particles over the squeegee length and to achieve a discharge value corresponding to the value in the center of the squeegee in the squeegee transition areas near the end faces of the magnetic brush roller.
  • the two wipers are arranged in the direction of movement of the photoconductive recording layer after the development station.
  • the advantage is achieved that in the area of the doctor blade transition zones, a significantly lower proportion of carrier particles is discharged compared to known development devices, so that a downstream magnetic stripper can be used, which can be produced inexpensively in a static design, and which has the low discharge in the middle of the development zone accumulates over long periods of time without having to be emptied due to overfilling, and to largely avoid disturbances in other components of the copying machine which are caused by carrier particles which adhere to the photoconductive recording layer.
  • the carrier particles are not removed from the recording layer after the development station, they cause local transmission disturbances, sand the fixing rollers of the copying machine and can penetrate into bearings, which can thereby “seize up”.
  • a magnetic brush developing device 1 shown in FIG. 1 for an electrostatic copying machine is adjacent to a drum 2, the surface of which is provided with a photoconductive recording layer 3 and which rotates in the direction of the arrow P.
  • the or the electrostatic charge images to be developed are located on the recording layer 3.
  • the developer is known to consist of toner and carrier particles. The latter are generally magnetic.
  • the electrostatic charge images attract the toner that adheres to them and develops the charge images into powder images.
  • the carrier particles are discharged from the development area through the photoconductive recording layer 3 and are removed from the photoconductive recording layer 3 by a magnetic stripper 25 arranged after the developing device 1.
  • the magnetic brush roller 4 rotates in the same direction of rotation as the drum 2, which rotates in the direction of the arrow P 'and carries on its surface a developer fur 5, which is wiped off by a doctor blade 6, which is shown horizontally in FIG. 1, but also can be inclined to the surface of the magnetic brush roller 4 in any other direction.
  • the two wipers 7', 7" consist of non-magnetic , elastic material and are in contact with the photoconductive recording layer 3 so that they enclose an angle between 5 ° to 10 ° with the tangent t to the recording layer at the point of contact of the wipers.
  • the wipers 7 ', 7 "form an angle between 45 ° and 90 ° with the doctor blade 6.
  • the storage container 15 for the developer supply 11 has a bent edge 13, on which the squeegee 6 and the wipers 7 ', 7 "are fastened by means of a screw 9.
  • each wiper 7', 7" is made of two angled sheets 8, 8 'edged, of which the lower plate rests on the squeegee 6.
  • In the edge 13 there is an elongated hole 26 so that it is possible to move the screw 9 in the elongated hole and thereby to change the distance of the doctor blade 6 from the surface of the magnetic brush roller 4.
  • the surface of the cylinder sleeve 18 of the magnetic brush roller 4 is provided with grooves 14 which promote the development of the developer fur 5.
  • the doctor blade 6 has a left transition zone 6 'and a right transition zone 6 ", these are the regions near the end faces 18', 18" of the cylinder sleeve 18. In the transition zones 6 ', 6 ", the wiping edge 27 of the doctor blade 6 extends downward
  • each wiper 7', 7 covers one of the transition zones 6 'and 6 "of the doctor blade 6 outwards and inwards, the overlap inwards in the direction of the doctor blade
  • the center line 24 is at least 4 mm, while the overlap is generally 10 mm or larger in the outside.
  • a wiper has the dimensions 18 mm x 2 mm and is 30 mm wide.
  • the elastic wipers 7 ', 7 "prevent the discharge of carrier particles 12 from the photoconductive recording layer 3 in the area of the doctor blade transition zones 6 ', 6", so that the stripped carrier particles can be attracted by the magnetic field of the magnetic brush roller 4 with ease.
  • FIG 3 shows the structure of the magnetic brush roller 4, which has magnets 17 within the cylinder sleeve 18 for generating the required magnetic field for the developer fur.
  • a cover 20 closes off the developing device from above, while a side part 16 surrounds the storage container 15. An opening is provided between the side part 16 and the cover 20, in the area of which the magnetic brush roller 4 is arranged close to the photoconductive recording layer 3.
  • the side part 16 is connected to a base plate 22 which is fastened to a frame 23 by means of screws. Behind the magnetic brush roller 4 there is a collector 19, the stripping plate 21 of which runs tangentially to the surface of the cylinder sleeve 18 of the magnetic brush roller 4 in order to strip the developer fur, not shown, from its surface.
  • the stripped developer passes from the collector 19 into a circulating device 28, for example a screw conveyor, which circulates the developer.
  • doctor blade 6 and the wipers 7 ', 7 is similar to that in FIG. 1 and is therefore not described again.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Magnetic Brush Developing In Electrophotography (AREA)
  • Dry Development In Electrophotography (AREA)
  • Image-Pickup Tubes, Image-Amplification Tubes, And Storage Tubes (AREA)
EP79102655A 1978-08-04 1979-07-26 Magnetbürsten-Entwicklungsvorrichtung für elektrostatische Ladungsbilder Expired EP0008040B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79102655T ATE235T1 (de) 1978-08-04 1979-07-26 Magnetbuersten-entwicklungsvorrichtung fuer elektrostatische ladungsbilder.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2834264 1978-08-04
DE19782834264 DE2834264A1 (de) 1978-08-04 1978-08-04 Magnetbuersten-entwicklungsvorrichtung fuer elektrostatische ladungsbilder

Publications (2)

Publication Number Publication Date
EP0008040A1 EP0008040A1 (de) 1980-02-20
EP0008040B1 true EP0008040B1 (de) 1981-09-16

Family

ID=6046251

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79102655A Expired EP0008040B1 (de) 1978-08-04 1979-07-26 Magnetbürsten-Entwicklungsvorrichtung für elektrostatische Ladungsbilder

Country Status (6)

Country Link
US (1) US4261289A (enrdf_load_stackoverflow)
EP (1) EP0008040B1 (enrdf_load_stackoverflow)
JP (1) JPS5522792A (enrdf_load_stackoverflow)
AT (1) ATE235T1 (enrdf_load_stackoverflow)
CA (1) CA1132341A (enrdf_load_stackoverflow)
DE (2) DE2834264A1 (enrdf_load_stackoverflow)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5648876B2 (enrdf_load_stackoverflow) * 1973-06-13 1981-11-18
JPH07107617B2 (ja) * 1985-04-18 1995-11-15 富士ゼロックス株式会社 電子複写機の現像装置
JPH0648404B2 (ja) * 1986-06-12 1994-06-22 コニカ株式会社 現像装置
JPH11272107A (ja) * 1998-03-19 1999-10-08 Canon Inc 塗布量規制体、この塗布量規制体を備える定着装置及び画像形成装置
WO2004088433A2 (en) * 2003-03-27 2004-10-14 Eastman Kodak Company Method and system for wide format toning
EP3033753B1 (en) 2013-10-23 2018-12-05 Prysmian S.p.A. Energy cable having a crosslinked electrically insulating layer, and method for extracting crosslinking by-products therefrom
EP3248197B1 (en) 2015-01-21 2021-06-23 Prysmian S.p.A. Accessory for high voltage direct current energy cables
CN107533885B (zh) 2015-04-22 2019-11-12 普睿司曼股份公司 具有交联电绝缘系统的能量电缆，和从中提取交联性副产物的方法

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3081737A (en) * 1961-03-01 1963-03-19 Gen Aniline & Film Corp Xerographic apparatus for applying ferromagnetic powder
US3866575A (en) * 1971-09-06 1975-02-18 Canon Kk Magnet roll developing device
US3884571A (en) * 1972-05-05 1975-05-20 Adalbert A Lux Leakage developer recirculation assembly
US4040387A (en) * 1972-09-24 1977-08-09 Mita Industrial Co. Ltd. Electrostatic photographic copying apparatus
US3918808A (en) * 1972-12-21 1975-11-11 Ricoh Kk Photoreceptor cleaning device for electrophotographic copying apparatus of the dry cleaning agent type
US3982498A (en) * 1973-11-19 1976-09-28 Xerox Corporation Development apparatus
US3999514A (en) * 1975-09-29 1976-12-28 International Business Machines Corporation Magnetic brush developer
JPS6044653B2 (ja) * 1976-05-17 1985-10-04 株式会社リコー 現像バイアス自動制御方法及びその装置

Also Published As

Publication number Publication date
DE2834264A1 (de) 1980-02-21
EP0008040A1 (de) 1980-02-20
DE2960834D1 (en) 1981-12-03
JPH0124308B2 (enrdf_load_stackoverflow) 1989-05-11
ATE235T1 (de) 1981-10-15
CA1132341A (en) 1982-09-28
JPS5522792A (en) 1980-02-18
US4261289A (en) 1981-04-14

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