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WO1989012260A1 - Poste de nettoyage - Google Patents

Poste de nettoyage Download PDF

Info

Publication number
WO1989012260A1
WO1989012260A1 PCT/NL1989/000041 NL8900041W WO8912260A1 WO 1989012260 A1 WO1989012260 A1 WO 1989012260A1 NL 8900041 W NL8900041 W NL 8900041W WO 8912260 A1 WO8912260 A1 WO 8912260A1
Authority
WO
WIPO (PCT)
Prior art keywords
cleaning
liquid
photoconductor surface
cleaning liquid
toner
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.)
Ceased
Application number
PCT/NL1989/000041
Other languages
English (en)
Inventor
Benzion Landa
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.)
Spectrum Sciences BV
Original Assignee
Spectrum Sciences BV
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
Priority claimed from US07/202,688 external-priority patent/US5108866A/en
Priority claimed from US07/268,855 external-priority patent/US5012300A/en
Application filed by Spectrum Sciences BV filed Critical Spectrum Sciences BV
Publication of WO1989012260A1 publication Critical patent/WO1989012260A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

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
    • 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
    • G03G21/0088—Arrangements not provided for by groups G03G13/00 - G03G19/00, e.g. cleaning, elimination of residual charge removing liquid developer

Definitions

  • the present invention is related to liquid toner electrophotography generally. BACKGROUND OF THE INVENTION
  • liquid toner comprising pigmented toner particles, carrier liquid and additives is used to wet a cleaning roller to aid in removal of the residual toner. It is feasible to use liquid toner instead of clear liquid since the liquid toner comprises only about 1.5% pigmented material.
  • a cleaning system for a multi ⁇ color liquid toner electrophotographic system including a photoconductor surface, the cleaning system comprising apparatus for wetting the photoconductor surface with a cleaning fluid comprising an essentially unpigmented carrier liquid to which is added a lubricant.
  • essentially unpigmented carrier liquid is used throughout to denote either a clear carrier liquid or a liquid toner which retains only about 1% or less of the normal pigmented particles normally found in a liquid toner.
  • lubricant is selected from the following: lecithin, Basic Barium Petronate, a silicone material or any other suitable lubricant.
  • the apparatus for filtering retains up to 0.1% of solid toner materials in the cleaning fluid.
  • Fig . 1 is a generalized il lustration of electrophotography apparatus constructed and operative in accordance with a preferred embodiment of the present invention.
  • FIG. 1 illustrates electrophotographic imaging apparatus constructed in accordance with a preferred embodiment of the present invention.
  • This and other embodiments of the invention are described for the case of liquid toners with negatively charged particles, and positively charged photoconductors.
  • the polarities of the voltages given would be reversed.
  • the toner of Example 1 of U. S. Patent 4,794,651 can be used, but a variety of liquid toner types are useful in the practice of the invention.
  • Fig. 1 The apparatus of Fig. 1 will be described in the context of a monochromatic system, it being appreciated that the present invention is applicable and particularly useful in a multi-color system, where for example the liquid toner in the developer is changed between he application of different colors, or where separate developers are provided for each color.
  • the apparatus of Fig. 1 comprises drum 10 arranged for rotation about an axle 12 in a direction generally indicated by arrow
  • the drum 10 is formed with a cylindrical photoconductive surface 16.
  • a corona discharge device 18 is operative to generally uniformly charge the photoconductive surface 16 with a positive charge.
  • a development unit 22 which is operative to apply a liquid toner to develop the electrostatic latent image.
  • the development unit 22 can for example comprise a plurality of developers, one for each color, which are selectively engaged as in U. S. Patent 4,690,539; which is incorporated herein by reference, or a single development station where the liquid toner is changed between colors, or any other suitable development system.
  • multi-color as used herein includes both full color processes and systems in which a single color, which can be changed, is printed at one time.
  • the photoconductor surface 16 passes a metering roller 26, preferably of the type illustrated in Fig. 1 of U. S. Patent
  • apparatus 40 Downstream of metering roller 26 there is provided apparatus 40 for transfer of the developed image from the photoconductor surface 16 to a substrate 130, such as paper.
  • the direct transfer is effected by the provision of guide rollers 132, 134 and 136, which guide a continuous web of substrate 130, and a drive roller 138, which cooperates with a support web 140.
  • a suitable charging device such as a corona discharge device 142, charges the substrate at a transfer location, for effecting electrophoretic transfer of the image from the photoconductor surface 16 to the substrate 130.
  • a cleaning station 49 This station may be any conventional cleaning station or preferably the cleaning station shown in Fig. 1, comprising a cleaning roller 56 which may comprise a suitable resilient material such as an open-cell polyethylene foam or preferably a resilient material such as polyethylene or neoprene having externally open or exposed, internally closed or isolated surface cells.
  • the cleaning station 49 also comprises a squeegee roller 50, having a non-cellular polyurethane body formed around a shaft with a dielectric insulating layer therebetween, if desired.
  • Squeegee roller 50 is driven so that its surface moves opposite to that of surface 16 at their nip to provide scrubbing action for removal of residual particles and carrier liquid not transferred to the substrate 130.
  • Cleaning roller 56 and squeegee roller 50 are urged against the drum surface 16 by any suitable means (not shown) .
  • Squeegee roller 50 is rotated in the direction indicated by an arrow 57 at a rate such that its surface velocity at the nip with the surface 16 is preferably equal to the velocity of that surface.
  • a conduit 54 supplies cleaning liquid to the nip of the squeegee roller 50 and the cleaning roller 56 for the removal of residual toner particles
  • the cleaning liquid comprises essentially unpigmented carrier liquid which may be derived from liquid toner by removal of most of the pigmented particles, and which retains lubricants therein.
  • the cleaning liquid comprises a carrier liquid such as Isopar to which lubricants such as small quantities of lecithin or Basic Barium Petronate or other suitable charge director, or a silicone material, or other suitable lubricant have been added.
  • a carrier liquid such as Isopar to which lubricants such as small quantities of lecithin or Basic Barium Petronate or other suitable charge director, or a silicone material, or other suitable lubricant have been added.
  • a small portion of the toner particles may remain in the cleaning fluid, and that these particles may also act as a lubricant. It has been found that Isopar, commonly used as the carrier liquid for liquid toners, may have an abrasive effect on the photoconductive drum, in the absence of lubricant.
  • the cleaning fluid which drains from the photoconductive surface 16 is typically collected in a collection container 60.
  • the liquid is then typically pumped by a pump 62 via a filter 64 which removes most but normally not all of the pigmented particles from cleaning fluid. Typically a 0.1% concentration of toner material remains in the cleaning fluid.
  • the filtered cleaning fluid typically is supplied to a storage tank 66, from which it is pumped by a pump 68 through conduit 54, in a recycled manner.
  • Any residual charge left on the photoconductive surface 16 is removed by flooding the photoconductor surface with light from a lamp 58.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)

Abstract

On a mis au point un système de nettoyage pour un système électrophotographique à colorant liquide ayant une surface photoconductrice. Ledit système de nettoyage comprend un appareil d'humidification de la surface photoconductrice avec un liquide de nettoyage, comprenant un véhicule liquide sensiblement non pigmenté contenant un lubrifiant.
PCT/NL1989/000041 1988-06-06 1989-06-05 Poste de nettoyage Ceased WO1989012260A1 (fr)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US07/202,688 US5108866A (en) 1988-06-06 1988-06-06 Process for preparing liquid toner composition
US202,688 1988-06-06
US07/268,855 US5012300A (en) 1988-06-06 1988-11-08 Two-color imaging system and process
US268,855 1988-11-08
US31912489A 1989-03-06 1989-03-06
US319,124 1989-03-06

Publications (1)

Publication Number Publication Date
WO1989012260A1 true WO1989012260A1 (fr) 1989-12-14

Family

ID=27394458

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL1989/000041 Ceased WO1989012260A1 (fr) 1988-06-06 1989-06-05 Poste de nettoyage

Country Status (1)

Country Link
WO (1) WO1989012260A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107533317A (zh) * 2015-07-31 2018-01-02 惠普深蓝有限责任公司 电子照相印刷

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129115A (en) * 1961-04-17 1964-04-14 Xerox Corp Xerographic developing apparatus
US3776632A (en) * 1972-02-24 1973-12-04 Savin Business Machines Corp Cleaning mechanism for photoconductive surfaces
US3871081A (en) * 1969-07-14 1975-03-18 Canon Kk Cleaning equipment for electrophotography
GB2095133A (en) * 1981-03-20 1982-09-29 Philips Nv Cleaning device for the intermediate image carrier of an electrophoretic printer
US4395113A (en) * 1981-10-29 1983-07-26 Nashua Corporation Methods and apparatus for cleaning photoconductive members

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3129115A (en) * 1961-04-17 1964-04-14 Xerox Corp Xerographic developing apparatus
US3871081A (en) * 1969-07-14 1975-03-18 Canon Kk Cleaning equipment for electrophotography
US3776632A (en) * 1972-02-24 1973-12-04 Savin Business Machines Corp Cleaning mechanism for photoconductive surfaces
GB2095133A (en) * 1981-03-20 1982-09-29 Philips Nv Cleaning device for the intermediate image carrier of an electrophoretic printer
US4395113A (en) * 1981-10-29 1983-07-26 Nashua Corporation Methods and apparatus for cleaning photoconductive members

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Patent Abstracts of Japan, vol. 6, no. 70, (P-113)(948), 6 May 1982; & JP-A-5710175 (RICOH K.K.) 19 January 1982 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107533317A (zh) * 2015-07-31 2018-01-02 惠普深蓝有限责任公司 电子照相印刷
US11067939B2 (en) 2015-07-31 2021-07-20 Hp Indigo B.V. Maintaining layer of cleaning solution on photoconductive surface via wiper with purposefully rounded edge

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