US3130079A - Apparatus for developing an electrostatic latent image - Google Patents

Apparatus for developing an electrostatic latent image Download PDF

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Publication number
US3130079A
US3130079A US39839A US3983960A US3130079A US 3130079 A US3130079 A US 3130079A US 39839 A US39839 A US 39839A US 3983960 A US3983960 A US 3983960A US 3130079 A US3130079 A US 3130079A
Authority
US
United States
Prior art keywords
housing
developing
latent image
rolls
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 - Lifetime
Application number
US39839A
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English (en)
Inventor
Meister Frederick W Von
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.)
Azoplate Corp
Original Assignee
Azoplate 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 Azoplate Corp filed Critical Azoplate Corp
Priority to US39839A priority Critical patent/US3130079A/en
Priority to AT501061A priority patent/AT247147B/de
Priority to GB23749/61A priority patent/GB983583A/en
Priority to CH782561A priority patent/CH395155A/de
Application granted granted Critical
Publication of US3130079A publication Critical patent/US3130079A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • G03G15/10—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer
    • G03G15/101—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer for wetting the recording material

Definitions

  • the invention deals with an apparatus for developing an electrostatic latent image and more particularly with an apparatus for developing an electrostatic latent image with a liquid developer.
  • an electrostatic latent image is obtained upon a photoconductive insulation material supported on a conductive backing.
  • the photoconductive insulating layer may be given a uniform electrostatic charge over its surface and then exposed to a light image through a transparent master to discharge the portions of the layer exposed to light while leaving the electrostatic charges in the areas not struck by excessive light to discharge themi
  • the charged areas are then developed by depositing finely-divided material thereon.
  • the electrograph'c reproduction material employed in the practice of this invention is prepared by applying to an electrically conductive base sheet, eg. a sheet of metal foil, an insulating layer of photoconductive material.
  • photoconductive insulating layers eg. by using selenium, sulphur, zinc oxide, or organic substances, e.g. anthracene or anthraquinone, and dissolving or dispersing the photoconductive substances in organic solvents in association with a soluble binding agent and subsequently appyling them to the base sheet.
  • organic substances e.g. anthracene or anthraquinone
  • dissolving or dispersing the photoconductive substances in organic solvents in association with a soluble binding agent subsequently appyling them to the base sheet.
  • lt is further known to prepare the photoconductive insulating layers by dispersing the photoconductive substances and the layer-forming binding agents in water, applying the aqueous dispersions to the electrically conductive bases, eg. metal foils, and drying them.
  • a developer which comprises a finely-divided powder dispersed in a liquid of high dielectric strength. Development is accomplished by submerging the electrostatically imaged electrophotographic material beneath the developing liquid, or by pouring the liquid on the imaged surface of the material, or by spreading the developer on the imaged surface with a roller or other applcator.
  • suitable liquid developers are those comprising a mixture of finely-divided electrostatically attractable material and polyethylene dispersed in a liquid hydrocarbon vehicle, and those comprising a mixture of finely-divided pigment and an alkyd resin dispersed in a liquid to form a developer of high resistivity.
  • Liquid developers of these types are described in U.S. Patents No. 2,89l,9ll and No. 2,907,674.
  • liquid developers are either inflammable, toxic, or odoriferous. For this reason liquid developers cannot be used safely in small rooms that are not well ventlated, and even then, the possibility of static sparks cannot be overlooked.
  • the present invention employs electrographic materials, e.g. plates, and liquid developers of the types described above.
  • the plate after having been provided with an electrostatic latent image according to known practice, or other contemplated suitable practice, is developed in an apparatus employing a liquid developer.
  • the process and apparatus of the invention comprises developing and fixing the electrostatically produced image in a housing containing conveying, developng and fixng means Operating under the influence of directed gas currents, whereby the infiammable, toXic or odoriferous gases or tumes produced in the developing and fixing Operations are safely removed from the housing.
  • the apparatus for developing an electrostatic latent image in accordance with the invention comprises a housing 1 of substantially rectangular form having four walls 2 which converge from their upper portions, as at 3, and continue as, or are connected to, a flue 4 and forming, e.g. a hood, which is mounted on a base 5 forming an efiective enclosure.
  • a partition 6 extends up- Wardly from the base 5 into the housing 1 and terminates substantially below the fiue 4 to provide separate com partments 7 and 8.
  • the base 5 is provided with a groove 9 conforming in configu'ation with the bottom edges 10 of walls 2 with the edges ll) seated in the grooves.
  • a pair of elongated parallel applicator rolls 11 and 12 are suitably mounted in compartment 7 one above the other and positioned longitudinally of the compartment 7.
  • the rolls are spaced from the wall 2 and partition 6 and are urged toward each other in a relationshp permitting one roll to drive the other.
  • the rolls are also spaced from the housing walls normal to their axes.
  • Roll 11 is composed of an electrically conductive material, eg. stairless steel, and is grounded in any suitable manner to housing 1, or is provided with a positive or negative potential.
  • the purpose of maintaining the conductive roll under grounded conditions or under a positive or negative potential is to prevent the discharging of the electrostatically imaged surface through the roll during the developing process.
  • Roll 12 is composed of either a conductive or nonconductive material, eg. rubber.
  • the compartment 8 contains at least one and preferably a pair of elongated heating elements 15 and 16, e.g. electrical resistance heating elements suitably mounted one above the other in parallel spaced relationship.
  • Each heating element is provided with a refiector 17 and 18, respectively, positioned to direct infrared radiation toward each other and to heat the space therebetween.
  • its cooperating reector is positioned to direct infrared radiation downwardly of the compartment 8.
  • the reflectors 17 and 18 are of substantially semi-cylindrical shape positioned longitudnally of the heating elements 15 and 16.
  • the heating units are mounted longitudinally of compartment 8 and spaced both from the housing walls normal to their axes and the wall and partition forming compartment S.
  • the primary purpose of the partition 6 is for shielding the developing means contained in compartment 7 from the heat produced by the heating elements 15 and 16.
  • Slots 19 'and 20 are formed 'through opposite walls 2 of housing 1 and slot 21 is formed through partition 6, the slots being preferably in horizontal alignment, parallel with base 5, or in lateral alignment, and positioned for the direction of electrographic plates or sheets between rolls 11 and 12 and heating elements 15 and 16.
  • a cooling or condensing tubular coil 22 is positioned inside housing 1, preferably in the flue portion 4 of the housing, or at the upper portion of the converging housing walls 3. Ends 23 and 24 of coil 22 pass through opposite walls of the housing whereby a coolant liquid or gas is passed through the coil.
  • An exhaust fan 25 and its motor 26 are suitably mounted in the flue portion 4 above the condensing coil 22.
  • a first drip pan 27 is appropriately mounted in the housing 1 below the condenser coil 22.
  • a second larger drip pan 28 is appropriately mounted in the housing 1 below the smaller drip pan 26. While the larger drip pan is illustrated in contact with opposite sides 2 of housing 1, it is spaced from the other two opposite sides of the housing to permit the passage of gases from lower portions of the housing upwardly through the flue portion 4.
  • Apertures 29 may be provided through the sides of drip pans 27 and 28.
  • the heating elements 15 and 16 are electrically energized and fan 25 and roll 11 are electrically motivated with the roll 11 rotating in the liquid developer 14.
  • a ⁇ coolant is passed through coil 22.
  • An electrographic sheet 30 of the type described above after having been provided with an electrostatic image, is passed between a pair of upper and lower spaced dielectric guide plates 31 and 32 mounted in slot 19. Similar guide plates 33, 34 and 35, 36 are mounted in slots 20 and 21, respectively.
  • the -sheet then passes into compartment 7 and between rolls 11 and 12, where the rotating roll 11, which is wet with developing solution from tray 13, applies the developing solution to the imaged surface of sheet 30 under the influence of the hold-down roll 12.
  • the sheet is thereby conveyed forwardly between dielectric plates 35 and 36, mounted in the slot formed through partition 6, and into the drying and fixing compartment 8.
  • the sheet passes through the compartment 8 between the heating elements 15 and 16, it is etfectively heated, dried and fixed by the heat developed by the heating elements, and the dried and fixed sheet passes between dielectric plates 33 and 34 outwardly of the housing 1.
  • the fan 25 in flue 4 provides a positive gas flow, e.g. air flow, through slots 19 and 20 and directs the air currents upwardly through the flue 4.
  • Apparatus for developing an electrostatc latent image comprising a housing, flue means communicating with a plurality of compartments within the housing, fluid developer applicating means mounted in one of the compartments, the applicator means comprising a pair of rolls one superposed on the other and a developer tray, one of the rolls being at least partly positioned in the tray and composed of electrically conductive material, infrared heating means mounted in another of the compartments, and sheet passage means formed through the walls of the housing in a path passing between the applicator rolls and through the heating compartment.
  • Apparatus for developing an electrostatic latent image comprising vapor condensing means mounted in the housing above the compartments, and gas notvating means mounted in the housing above the vapor condensing means.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
  • Wet Developing In Electrophotography (AREA)
US39839A 1960-06-30 1960-06-30 Apparatus for developing an electrostatic latent image Expired - Lifetime US3130079A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US39839A US3130079A (en) 1960-06-30 1960-06-30 Apparatus for developing an electrostatic latent image
AT501061A AT247147B (de) 1960-06-30 1961-06-28 Gerät zum Entwickeln elektrophotographischen Materials
GB23749/61A GB983583A (en) 1960-06-30 1961-06-30 Process and apparatus for developing an electrostatic latent image
CH782561A CH395155A (de) 1960-06-30 1961-06-30 Verfahren zur Entwicklung eines latenten elektrostatischen Bildes und Vorrichtung zur Ausführung des Verfahrens

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US39839A US3130079A (en) 1960-06-30 1960-06-30 Apparatus for developing an electrostatic latent image

Publications (1)

Publication Number Publication Date
US3130079A true US3130079A (en) 1964-04-21

Family

ID=21907602

Family Applications (1)

Application Number Title Priority Date Filing Date
US39839A Expired - Lifetime US3130079A (en) 1960-06-30 1960-06-30 Apparatus for developing an electrostatic latent image

Country Status (4)

Country Link
US (1) US3130079A (de)
AT (1) AT247147B (de)
CH (1) CH395155A (de)
GB (1) GB983583A (de)

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245330A (en) * 1962-11-29 1966-04-12 Minolta Camera Kk Wet electronic copying apparatus
US3262381A (en) * 1963-09-30 1966-07-26 Deluxe Lab Inc Method and apparatus for improving upon the reproduction of images recorded on a photographic film
US3356072A (en) * 1966-10-12 1967-12-05 Dennison Mfg Co Apparatus for developing electrostatic images
US3364594A (en) * 1965-07-08 1968-01-23 Addressograph Multigraph Drying processed photographic material
US3403457A (en) * 1966-08-29 1968-10-01 Du Pont Dryer seal
US3424582A (en) * 1964-05-20 1969-01-28 Itek Corp Data processing system
US3440675A (en) * 1966-09-22 1969-04-29 Sav On Draperies Inc Score card cleaning apparatus
US3460509A (en) * 1967-07-24 1969-08-12 Steven L Kaczeus Web-dispensing machine
US3601092A (en) * 1969-02-28 1971-08-24 Ricoh Kk Developing device for wet process electrophotography
JPS4922146A (de) * 1972-06-16 1974-02-27
JPS4989541A (de) * 1972-12-26 1974-08-27
JPS4997773A (de) * 1973-01-23 1974-09-17
JPS49130739A (de) * 1973-04-17 1974-12-14
JPS5013055A (de) * 1973-06-04 1975-02-10
JPS5071342A (de) * 1973-10-24 1975-06-13
JPS5166836A (ja) * 1974-12-06 1976-06-09 Canon Kk Ekitaigenzodenshishashinfukushakino kyariaekikaishusochi
US4415533A (en) * 1980-06-18 1983-11-15 Ricoh Co., Ltd. Process for treating exhaust gas from electrophotographic machine and apparatus thereof
US4500618A (en) * 1982-06-30 1985-02-19 Fuji Photo Film Co., Ltd. Electrophotographic process for producing printing plate and plate making machine
US4760423A (en) * 1987-03-12 1988-07-26 Savin Corporation Apparatus and method for reducing hydrocarbon emissions from a liquid-based electrophotographic copying machine
US4766462A (en) * 1986-07-21 1988-08-23 Xerox Corporation Liquid carrier recovery system
WO2004034152A1 (en) 2002-10-11 2004-04-22 Hewlett-Packard Development Company, L.P. System and method for extracting carrier liquid
US20060088332A1 (en) * 2004-10-22 2006-04-27 Samsung Electronics Co. Oxygen generators in ink cartridge environment

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1228225A (en) * 1912-10-16 1917-05-29 Du Pont Powder Co Apparatus for recovering solvents.
US1745437A (en) * 1928-01-07 1930-02-04 Motley Lewis Means for waterproofing sacks, bags, or other articles
DE1021715B (de) * 1956-06-29 1957-12-27 Zindler Lumoprint Kg Verfahren und Vorrichtung zur Entwicklung eines latenten elektrostatischen Bildes
US2857272A (en) * 1954-09-28 1958-10-21 Rca Corp Electrostatic printing
US2907674A (en) * 1955-12-29 1959-10-06 Commw Of Australia Process for developing electrostatic image with liquid developer
US2913353A (en) * 1955-02-08 1959-11-17 Gen Dynamics Corp Method and apparatus for developing electrostatic image
US2991754A (en) * 1959-02-06 1961-07-11 Rca Corp Developing apparatus

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1228225A (en) * 1912-10-16 1917-05-29 Du Pont Powder Co Apparatus for recovering solvents.
US1745437A (en) * 1928-01-07 1930-02-04 Motley Lewis Means for waterproofing sacks, bags, or other articles
US2857272A (en) * 1954-09-28 1958-10-21 Rca Corp Electrostatic printing
US2913353A (en) * 1955-02-08 1959-11-17 Gen Dynamics Corp Method and apparatus for developing electrostatic image
US2907674A (en) * 1955-12-29 1959-10-06 Commw Of Australia Process for developing electrostatic image with liquid developer
DE1021715B (de) * 1956-06-29 1957-12-27 Zindler Lumoprint Kg Verfahren und Vorrichtung zur Entwicklung eines latenten elektrostatischen Bildes
US2991754A (en) * 1959-02-06 1961-07-11 Rca Corp Developing apparatus

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3245330A (en) * 1962-11-29 1966-04-12 Minolta Camera Kk Wet electronic copying apparatus
US3262381A (en) * 1963-09-30 1966-07-26 Deluxe Lab Inc Method and apparatus for improving upon the reproduction of images recorded on a photographic film
US3424582A (en) * 1964-05-20 1969-01-28 Itek Corp Data processing system
US3364594A (en) * 1965-07-08 1968-01-23 Addressograph Multigraph Drying processed photographic material
US3403457A (en) * 1966-08-29 1968-10-01 Du Pont Dryer seal
US3440675A (en) * 1966-09-22 1969-04-29 Sav On Draperies Inc Score card cleaning apparatus
US3356072A (en) * 1966-10-12 1967-12-05 Dennison Mfg Co Apparatus for developing electrostatic images
US3460509A (en) * 1967-07-24 1969-08-12 Steven L Kaczeus Web-dispensing machine
US3601092A (en) * 1969-02-28 1971-08-24 Ricoh Kk Developing device for wet process electrophotography
JPS4922146A (de) * 1972-06-16 1974-02-27
JPS4989541A (de) * 1972-12-26 1974-08-27
JPS4997773A (de) * 1973-01-23 1974-09-17
JPS49130739A (de) * 1973-04-17 1974-12-14
JPS5013055A (de) * 1973-06-04 1975-02-10
JPS5071342A (de) * 1973-10-24 1975-06-13
JPS5166836A (ja) * 1974-12-06 1976-06-09 Canon Kk Ekitaigenzodenshishashinfukushakino kyariaekikaishusochi
US4415533A (en) * 1980-06-18 1983-11-15 Ricoh Co., Ltd. Process for treating exhaust gas from electrophotographic machine and apparatus thereof
US4500618A (en) * 1982-06-30 1985-02-19 Fuji Photo Film Co., Ltd. Electrophotographic process for producing printing plate and plate making machine
US4766462A (en) * 1986-07-21 1988-08-23 Xerox Corporation Liquid carrier recovery system
US4760423A (en) * 1987-03-12 1988-07-26 Savin Corporation Apparatus and method for reducing hydrocarbon emissions from a liquid-based electrophotographic copying machine
WO2004034152A1 (en) 2002-10-11 2004-04-22 Hewlett-Packard Development Company, L.P. System and method for extracting carrier liquid
US20060088332A1 (en) * 2004-10-22 2006-04-27 Samsung Electronics Co. Oxygen generators in ink cartridge environment
US7231162B2 (en) 2004-10-22 2007-06-12 Samsung Electronics Co., Ltd. Oxygen generators in ink cartridge environment

Also Published As

Publication number Publication date
GB983583A (en) 1965-02-17
CH395155A (de) 1965-07-15
AT247147B (de) 1966-05-25

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