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EP0036290B1 - Reinigungsvorrichtung für eine Oberfläche - Google Patents

Reinigungsvorrichtung für eine Oberfläche Download PDF

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Publication number
EP0036290B1
EP0036290B1 EP19810301015 EP81301015A EP0036290B1 EP 0036290 B1 EP0036290 B1 EP 0036290B1 EP 19810301015 EP19810301015 EP 19810301015 EP 81301015 A EP81301015 A EP 81301015A EP 0036290 B1 EP0036290 B1 EP 0036290B1
Authority
EP
European Patent Office
Prior art keywords
roller
particles
magnitude
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.)
Expired
Application number
EP19810301015
Other languages
English (en)
French (fr)
Other versions
EP0036290A1 (de
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/de
Application granted granted Critical
Publication of EP0036290B1 publication Critical patent/EP0036290B1/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
    • 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 and with a magnitude sufficiently high to attract the toner particles from the cleaning beads thereto.
  • U.S. Patent No. 3,920,329 described 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 positioned interiorly thereof. As the cylinder rotates, it advances magnetic carrier beads into contact with the photoreceptor to attract the background toner thereto triboelectrically.
  • 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 aims at providing more-efficient removal of residual particles from the cleaning material, so as to prevent or inhibit such particles from being reattracted back to the original surface.
  • the present invention provides cleaning apparatus which is as claimed in the appended claims.
  • drum 10 includes an electroconductive 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 discharge the photoconductive surface totally.
  • 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 attracted 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 ensures 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 about the circumferential surface thereof.
  • a non-magnetic, conductive, tubular member 54 is positioned 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 speed.
  • 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 30 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 to about 30 pm 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 reuse 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)

Claims (8)

1. Vorrichtung (50) zum Entfernen von Teilchen von einer Fläche (10) mit einer Einrichtung (52, 54) zum Fördern eines Entfernungsmaterials bis in Kontakt mit der Fläche, wobei die genannte Fördereinrichtung (52, 54) eine elektrische Vorspannung von einer Polarität und Größe aufweist, die ausreichend ist, die Teilchen von der Fläche zum Entfernungsmaterial anzuziehen, mit einer Einrichtung (62) zum Anziehen der Teilchen von dem Entfernungsmaterial an sich selbst bestehend aus einem elektrisch leitfähigen Material, das mit der gleichen Polarität wie die genannte Fördereinrichtung (52, 54) und mit einer Größe, welche die der elektrischen Vorspannung an der genannten Fördereinrichtung (52, 54) übersteigt, elektrisch vorgespannt ist, dadurch gekennzeichnet, daß die genannte Anziehungseinrichtung (62) mit einer Schicht eines elektrischen Isoliermaterials auf ihrer Außenfläche versehen ist.
2. Vorrichtung (50) nach Anspruch 1, in welcher die genannte Anzeihungseinrichtung (62) eine Rolle (62) aufweist, die der genannten Fördereinrichtung (52, 54) eng benachbart angeordnet ist.
3. Vorrichtung (50) nach Anspruch 2, die weiter eine Rollen-Spannungsquelle (66) aufweist, die an die genannte Rolle (62) angeschlossen ist, wobei die genannte Rollen-Spannungsquelle (66) die genannte Rolle (62) mit einer ersten Polarität und einer ersten Größe elektrisch vorspannt.
4. Vorrichtung (50) nach Anspruch 2 oder 3, in welcher die genannte Rolle (62) aus Aluminium hergestellt ist und eine darauf angeordnete Schicht aus Aluminiumoxid aufweist.
5. Vorrichtung (50) nach Anspruch 1, 2, 3 oder 4, in welcher die genannte Fördereinrichtung (52, 54) einen mit geringem Abstand zu der Fläche angeordneten, nicht-magnetischen, rohrförmigen Teil (54) und einen im Inneren des genannten rohrförmigen Teils (54) angebrachten und mit Abstand von dessen innerer Umfangsfläche angeordneten magnetischen Teil (52) aufweist.
6. Vorrichtung (50) nach Anspruch 5, welche ferner eine Rohr-Spannungsquelle (60) aufweist, die an dem genannten rohrförmigen Teil (54) angeschlossen ist, welche genannte Rohr-Spannungsquelle (60) den genannten rohrförmigen Teil (54) mit einer zweiten Polarität und einer zweiten Größe elektrisch vorspannt, wobei die zweite Polarität die gleiche wie die erste Polarität und die zweite Größe geringer als die erste Größe ist.
7. Vorrichtung (50) nach Anspruch 6, welche weiterhin Mittel (68) zum Entfernen der Teilchen von der genannten Rolle (62) und Mittel (70) zur Aufbewahrung der von der genannten Rolle (62) entfernten Teilchen aufweist.
8. Vorrichtung (50) nach Anspruch 7, in welcher das Entfernungsmaterial magnetische Körnchen aufweist.
EP19810301015 1980-03-17 1981-03-11 Reinigungsvorrichtung für eine Oberfläche Expired EP0036290B1 (de)

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 EP0036290A1 (de) 1981-09-23
EP0036290B1 true EP0036290B1 (de) 1984-12-05

Family

ID=22446417

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810301015 Expired EP0036290B1 (de) 1980-03-17 1981-03-11 Reinigungsvorrichtung für eine Oberfläche

Country Status (8)

Country Link
EP (1) EP0036290B1 (de)
JP (1) JPS56143477A (de)
AU (1) AU541174B2 (de)
BR (1) BR8101511A (de)
CA (1) CA1184591A (de)
DE (1) DE3167540D1 (de)
ES (1) ES500457A0 (de)
MX (1) MX150481A (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0244304Y2 (de) * 1980-08-30 1990-11-26
US4547063A (en) * 1983-07-25 1985-10-15 Xerox Corporation Moving magnet cleaner
US4705387A (en) * 1983-12-21 1987-11-10 Xerox Corporation Cleaning apparatus for charge retentive surface
JPH0349049Y2 (de) * 1985-03-13 1991-10-21
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
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

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4837382B1 (de) * 1968-08-26 1973-11-10
JPS51146831A (en) * 1975-06-11 1976-12-16 Ricoh Co Ltd Photo-sensible element non-image part cleaning method and its device

Also Published As

Publication number Publication date
JPS56143477A (en) 1981-11-09
JPH0154708B2 (de) 1989-11-20
CA1184591A (en) 1985-03-26
ES8206869A1 (es) 1982-08-16
EP0036290A1 (de) 1981-09-23
DE3167540D1 (en) 1985-01-17
BR8101511A (pt) 1981-09-22
ES500457A0 (es) 1982-08-16
MX150481A (es) 1984-05-14
AU541174B2 (en) 1984-12-20
AU6814681A (en) 1981-09-24

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