EP0036290A1 - Dispositif de nettoyage de particules se trouvant sur une surface - Google Patents

Dispositif de nettoyage de particules se trouvant sur une surface Download PDF

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Publication number
EP0036290A1
EP0036290A1 EP19810301015 EP81301015A EP0036290A1 EP 0036290 A1 EP0036290 A1 EP 0036290A1 EP 19810301015 EP19810301015 EP 19810301015 EP 81301015 A EP81301015 A EP 81301015A EP 0036290 A1 EP0036290 A1 EP 0036290A1
Authority
EP
European Patent Office
Prior art keywords
roller
magnitude
particles
polarity
magnetic
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
EP19810301015
Other languages
German (de)
English (en)
Other versions
EP0036290B1 (fr
Inventor
Donald A. Seanor
Paul A. Garsin
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.)
Xerox Corp
Original Assignee
Xerox Corp
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 Xerox Corp filed Critical Xerox Corp
Publication of EP0036290A1 publication Critical patent/EP0036290A1/fr
Application granted granted Critical
Publication of EP0036290B1 publication Critical patent/EP0036290B1/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
    • G03G21/00—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge
    • G03G21/0005—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium
    • G03G21/0047—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge for removing solid developer or debris from the electrographic recording medium using electrostatic or magnetic means; Details thereof, e.g. magnetic pole arrangement of magnetic devices
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2221/00—Processes not provided for by group G03G2215/00, e.g. cleaning or residual charge elimination
    • G03G2221/0005—Cleaning of residual toner

Definitions

  • This invention relates to apparatus for cleaning particles from a surface, particularly in an electrophotographic reproduction machine.
  • U .S. Patent No. 3,580,673 discloses an apparatus for cleaning toner particles from a recording surface.
  • the apparatus includes a rotatably- mounted non-magnetic cylindrical member housing a permanent bar magnet.
  • the cylindrical member moves magnetic beads into contact with the recording surface.
  • An electrical bias opposite in polarity to the polarity of the toner particles is applied thereto.
  • the electrical bias is sufficient to attract the toner particles to the cleaning beads.
  • a conductive roll is positioned in contact with the magnetic beads. The roll is electrically biased to the same polarity as the cylindrical member with their magnitude being sufficiently high to attract the toner particles from the cleaning beads thereto.
  • U .S. Patent No. 3,920,329 describes a background removal apparatus including a magnetic brush for removing background toner from a photoreceptor.
  • the magnetic brush has a rotatably mounted, non-magnetic cylinder with two permanent bar magnets being positioned interiorly thereof. As the cylinder rotates, it advances magnetic carrier beads into contact with the photoreceptor to triboelectrically attract the background toner thereto.
  • the magnetic brush is electrically biased to a positive polarity.
  • a re-claim roller is positioned closely adjacent to the magnetic brush and also biased to a positive polarity of a greater magnitude to attract the particles from the carrier granules thereto.
  • the re-claim roller is made from a non-magnetic material e.g. non-magnetic stainless steel.
  • U.S.-Patent No. 4,006,987 discloses an apparatus for cleaning residual toner from an electrostatic recording medium.
  • the cleaning apparatus includes an electrically biased, rotatably mounted cylindrical sleeve. Permanent magnets are mounted fixedly interiorly of the sleeve. As the sleeve rotates, magnetic particles adhering thereto contact the recording medium and triboelectrically attract the residual toner thereto. A roller contacts the magnetic particles to attract the residual toner therefrom.
  • the roller comprises an electrically grounded conductive metal cylinder having an insulating layer coated thereon.
  • the present invention is characterized by means for transporting a cleaning material into contact with the surface, said transporting means being electrically biased to a polarity and magnitude sufficient to attract the particles from the surface to the cleaning material; and non - electrically conducting means, electrically biased to the same polarity as the transporting means and to a magnitude greater than the magnitude electrically biasing said transporting means, for attracting the particles from the cleaning material thereto.
  • drum 10 As shown in Figure 1, the electrophotographic printing machine employs a drum, indicated generally by the reference numeral 10.
  • drum 10 includes a conductive substrate, such as aluminum, having a photoconductive material e.g., a selenium alloy, deposited thereon.
  • Drum 10 rotates in the direction of arrow 12 to pass through the various processing stations disposed thereabout.
  • drum 10 moves a portion of the photoconductive surface through charging station A.
  • a corona generating device indicated generally by the reference numeral 14, charges the photoconductive surface of drum 10 to a relatively high, substantially uniform potential.
  • the charged portion of the photoconductive surface of drum 10 is advanced through exposure station B.
  • an original document is placed face-down upon a transparent platen.
  • the exposure system indicated generally by the reference numeral 16, includes a lamp which moves across the original document illuminating incremental widths thereof.
  • the light rays reflected from the original document are transmitted through a moving lens system to form incremental width light images. These light images are focused onto the charged portion of the photoconductive surface.
  • the charged photoconductive surface of drum 10 is discharged selectively by the light images of the original document.
  • This records an electrostatic latent image on the photoconductive surface which corresponds to the informational areas contained within the original document. It has been found that illuminating the charged portion of the photoconductive surface fails to totally discharge the photoconductive surface.
  • the photoconductive surface retains background charge areas which are of some residual voltage level.
  • the background areas may have a nominal potential of about 50 volts while the electrostatic latent image or image areas may have a nominal potential of about 350 volts.
  • drum 10 advances the electrostatic latent image recorded on the photoconductive surface to development station C.
  • a magnetic brush development system indicated generally by the reference numeral 18, transports the developer material into contact with the photoconductive surface of drum 10.
  • the toner particles are attractd from the carrier granules to the electrostatic latent image forming a toner powder image corresponding to the informational areas of the original document.
  • drum 10 advances the powder image to transfer station D.
  • a sheet of support material is positioned in contact with the powder image formed on the photoconductive surface of drum 10.
  • the sheet of support material is advanced to transfer station D by a sheet feeding apparatus, indicated generally by the reference numeral 20.
  • sheet feeding apparatus 20 includes a feed roll 22 contacting the uppermost sheet of the stack 24 of sheets of support material. Feed roll 22 rotates in the direction of arrow 26 so as to advance the uppermost sheet from stack 24. Registration rollers 28, rotating in the direction of arrow 30, align and forward the advancing sheet of support material into chute 32. Chute 32 directs the advancing sheet of support material into contact with the photoconductive surface of drum 10 in a timed sequence. This insures that the powder image contacts the advancing sheet of support material at transfer station D.
  • Transfer station D includes a corona generating device 34, which applies a spray of ions to the backside of the sheet. This attracts the powder image from the photoconductive surface of drum 10 to the sheet. After transfer, the sheet continues to move with drum . 10. .
  • a detack corona generating device (not shown) neutralizes the charge causing the sheet to adhere to the drum. The sheet is then separated from drum 10.
  • Conveyor 36 advances the sheet in the direction of arrow 38, from transfer station D to fusing station E.
  • Fusing station E indicated generally by the reference numeral 40, includes a back-up roller 42 and a heated fuser roller 44.
  • a sheet of support material with the powder image thereon passes between back-up roller 42 and fuser roller 44.
  • the powder image contacts fuser roller 44 and the heat and pressure applied thereto permanently affixes it to the sheet of support material.
  • forwarding rollers 46 advance the finished copy sheet to catch tray 48. Once a copy sheet is positioned in catch tray 48, it may be readily removed therefrom by the machine operator.
  • cleaning station F includes a cleaning system 50 which attracts the toner particles from the photoconductive surface of drum 10 thereto.
  • cleaning system 50 will be described hereinafter with reference to Figure 2.
  • FIG. 2 depicts cleaning apparatus 50 in greater detail.
  • cleaning apparatus 50 comprises a cylindrical magnet 52 having a plurality of magnetic poles impressed about the circumferential surface thereof.
  • a non-magnetic, conductive, tubular member 54 is interfit over magnet 52.
  • the interior circumferential surface of tube 54 is spaced from the exterior circumferential surface of magnet 52.
  • Tube 54 is mounted rotatably.
  • a constant speed motor rotates tube 54 at a substantially constant angular velocity.
  • magnet 52 is made from barium ferrite with tube 54 being made from aluminum.
  • Magnet 52 is mounted fixedly and remains substantially stationary as tube 54 rotates in the direction of arrow 56. As tube 54 rotates in the direction of arrow 56, it passes through housing 58.
  • Housing 58 stores a supply of magnetic granules. These magnetic granules are attracted to tube 54.
  • Voltage source 60 is connected to tube 54 and applies a D.C. electrical field thereto.
  • the polarity of this field is opposite to that of the toner particles adhering to the photoconductive surface of drum 10 and of a magnitude sufficient to attract the toner particles from the photoconductive surface to the magnetic particles adhering to tube 54.
  • the magnetic particles are selected so that the toner particles have a triboelectric affinity thereto.
  • voltage source 60 electrically biases tubular member 54 to a voltage level ranging from about 300 to about 500 volts.
  • Roller 62 is positioned closely adjacent to tube 54. As roller 62 rotates in the direction of arrow 64, it attracts the toner particles from the magnetic particles adhering to tube 54. Voltage source 66 electrically biases roller 62 to the same polarity as voltage source 60 electrically biases tube 54. However, the magnitude of the electrical bias applied by voltage source 66 to roller 62 is greater than the electrical bias applied by voltage source 60 to tube 54. For example, the magnitude of the electrical bias applied to roller 62 may range from about 300 to about 500 volts with the specific magnitude selected being greater than the magnitude of the electrical bias applied to tube 54.
  • roller 62 is made from aluminum having a coating of aluminum oxide thereon.
  • the layer of aluminum oxide ranges from about 20 microns to about 30 microns thick.
  • a metering blade 68 is located closely adjacent to roller 62 for removing the toner particles therefrom.
  • Metering blade 68 deflects or shears the toner particles from roller 62 into the chamber of housing 70. Toner particles fall into the chamber of housing 70-under the influence of gravity. These toner particles may be recycled for subsequent re-use in the printing machine development system.
  • blade 68 may be made from sheet metal extending across the width of roller 62.
  • the cleaning apparatus comprises a magnetic transport which advances magnetic particles having a triboelectric affinity into contact with the residual toner particles.
  • the magnetic transport is electrically biased to a suitable polarity and magnitude to attract the toner particles from the photoconductive surface to the magnetic particles adhering thereto.
  • the toner particles are removed from the magnetic particles by being attracted to a roller which is electrically biased to the same polarity as the magnetic transport with the magnitude thereof being greater than the magnitude of the electrical bias applied to the magnetic transport.
  • a metering blade removes the residual toner particles from the roller and deflects them into the chamber of a housing for subsequent reuse in the printing machine.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Cleaning In Electrography (AREA)
  • Discharging, Photosensitive Material Shape In Electrophotography (AREA)
  • Cleaning In General (AREA)
EP19810301015 1980-03-17 1981-03-11 Dispositif de nettoyage de particules se trouvant sur une surface Expired EP0036290B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US13080580A 1980-03-17 1980-03-17
US130805 1980-03-17

Publications (2)

Publication Number Publication Date
EP0036290A1 true EP0036290A1 (fr) 1981-09-23
EP0036290B1 EP0036290B1 (fr) 1984-12-05

Family

ID=22446417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810301015 Expired EP0036290B1 (fr) 1980-03-17 1981-03-11 Dispositif de nettoyage de particules se trouvant sur une surface

Country Status (8)

Country Link
EP (1) EP0036290B1 (fr)
JP (1) JPS56143477A (fr)
AU (1) AU541174B2 (fr)
BR (1) BR8101511A (fr)
CA (1) CA1184591A (fr)
DE (1) DE3167540D1 (fr)
ES (1) ES8206869A1 (fr)
MX (1) MX150481A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4402103A (en) * 1980-08-30 1983-09-06 Ricoh Company, Ltd. Cleaning unit for copying machine
GB2143776A (en) * 1983-07-25 1985-02-20 Xerox Corp Cleaning photoreceftor surfaces
EP0147187A1 (fr) * 1983-12-21 1985-07-03 Xerox Corporation Dispositif de nettoyage pour surface retenant une charge électrique
US4819026A (en) * 1987-12-21 1989-04-04 Xerox Corporation Cleaning apparatus for a charge retentive surface
US4989047A (en) * 1989-12-11 1991-01-29 Xerox Corporation Cleaning apparatus for the reduction of agglomeration-caused spotting

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0349049Y2 (fr) * 1985-03-13 1991-10-21
US5737670A (en) * 1990-05-12 1998-04-07 Minolta Co., Ltd. Forming method and apparatus
US5124757A (en) * 1990-06-25 1992-06-23 Minolta Camera Kabushiki Kaisha Image forming method and apparatus including treatment and collection of residual developer

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1259890A (en) * 1968-08-26 1972-01-12 Rank Xerox Ltd Cleaning method and apparatus for electrostatic copying machines
US4095980A (en) * 1975-06-11 1978-06-20 Ricoh Company, Ltd. Drum cleaning method and apparatus for electrostatography

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1259890A (en) * 1968-08-26 1972-01-12 Rank Xerox Ltd Cleaning method and apparatus for electrostatic copying machines
US4095980A (en) * 1975-06-11 1978-06-20 Ricoh Company, Ltd. Drum cleaning method and apparatus for electrostatography

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4402103A (en) * 1980-08-30 1983-09-06 Ricoh Company, Ltd. Cleaning unit for copying machine
GB2143776A (en) * 1983-07-25 1985-02-20 Xerox Corp Cleaning photoreceftor surfaces
EP0147187A1 (fr) * 1983-12-21 1985-07-03 Xerox Corporation Dispositif de nettoyage pour surface retenant une charge électrique
US4819026A (en) * 1987-12-21 1989-04-04 Xerox Corporation Cleaning apparatus for a charge retentive surface
US4989047A (en) * 1989-12-11 1991-01-29 Xerox Corporation Cleaning apparatus for the reduction of agglomeration-caused spotting
US5031000A (en) * 1989-12-11 1991-07-09 Xerox Corporation Cleaning apparatus for the reduction of agglomeration-caused spotting

Also Published As

Publication number Publication date
ES500457A0 (es) 1982-08-16
DE3167540D1 (en) 1985-01-17
AU541174B2 (en) 1984-12-20
ES8206869A1 (es) 1982-08-16
MX150481A (es) 1984-05-14
JPH0154708B2 (fr) 1989-11-20
AU6814681A (en) 1981-09-24
CA1184591A (fr) 1985-03-26
BR8101511A (pt) 1981-09-22
JPS56143477A (en) 1981-11-09
EP0036290B1 (fr) 1984-12-05

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