US3806240A - Electrophotographic apparatus - Google Patents

Electrophotographic apparatus Download PDF

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Publication number
US3806240A
US3806240A US21308771A US3806240A US 3806240 A US3806240 A US 3806240A US 21308771 A US21308771 A US 21308771A US 3806240 A US3806240 A US 3806240A
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US
United States
Prior art keywords
liquid
paper
photosensitive
cutting
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
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English (en)
Inventor
S Matsumoto
M Takimoto
Y Tamai
M Sato
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.)
Fujifilm Holdings Corp
Original Assignee
Fuji Photo Film Co Ltd
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 Fuji Photo Film Co Ltd filed Critical Fuji Photo Film Co Ltd
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Publication of US3806240A publication Critical patent/US3806240A/en
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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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6597—Apparatus which relate to the handling of copy material the imaging being conformed directly on the copy material, e.g. using photosensitive copy material, dielectric copy material for electrostatic printing
    • 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
    • G03G15/22—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20
    • G03G15/26—Apparatus for electrographic processes using a charge pattern involving the combination of more than one step according to groups G03G13/02 - G03G13/20 in which the charge pattern is obtained by projection of the entire image, i.e. whole-frame projection
    • 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
    • G03G15/65—Apparatus which relate to the handling of copy material
    • G03G15/6588—Apparatus which relate to the handling of copy material characterised by the copy material, e.g. postcards, large copies, multi-layered materials, coloured sheet material
    • G03G15/6594—Apparatus which relate to the handling of copy material characterised by the copy material, e.g. postcards, large copies, multi-layered materials, coloured sheet material characterised by the format or the thickness, e.g. endless forms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00367—The feeding path segment where particular handling of the copy medium occurs, segments being adjacent and non-overlapping. Each segment is identified by the most downstream point in the segment, so that for instance the segment labelled "Fixing device" is referring to the path between the "Transfer device" and the "Fixing device"
    • G03G2215/00405—Registration device
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00443—Copy medium
    • G03G2215/00518—Recording medium, e.g. photosensitive
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00535—Stable handling of copy medium
    • G03G2215/00607—Debris handling means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/00362—Apparatus for electrophotographic processes relating to the copy medium handling
    • G03G2215/00789—Adding properties or qualities to the copy medium
    • G03G2215/00814—Cutter
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/26—Web or sheet containing structurally defined element or component, the element or component having a specified physical dimension
    • Y10T428/263—Coating layer not in excess of 5 mils thick or equivalent
    • Y10T428/264—Up to 3 mils
    • Y10T428/265—1 mil or less
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/263—With means to apply transient nonpropellant fluent material to tool or work

Definitions

  • the present invention relates to an electrophotographic apparatus, and particularly to an electrophotographic duplicaing apparatus which is excellent in the reproduction of continuous-tone images.
  • electrophotographic photosensitive paper is provided with a photoconductive insulating layer on a support (usually paper) which has been subjected to an electroconductive treatment.
  • a support usually paper
  • this electroconductive treatment is very important.
  • the electroconductive treatment is effected by applying or impregnating a moistureabsorbent quaternary ammonium compound or vinylbenzene sulfonate onto the surface of paper.
  • moisture-absorbent inorganic compund
  • alumina gel stabilized with a mineral acid such as an alumina gel stabilized with a mineral acid, or a silica gel, may be used in conjunction with the above materials.
  • Such paper chips attach themselves to electric circuits and tend to damage the insulating property thereof. Particularly, when they attach to the metallic needles or metallic wires of a corona discharge electrode, non-uniform charging occurs. When such paper chips attach to an optical syste, the contrast of image is decreased. Thus, the chips of the electroconductive material to be treated can have a harmful effect when they are dispersed, and they result in shortening the life of the duplicator.
  • the present invention relates to an electrophotographic apparatus in which the above-mentioned deany out chips at all.
  • the present invention relates to an electrophotographic apparatus wherein the parts for contacting at least the surface of the photosensitive layer of a weblike photosensitive paper with a liquid of high electric insulation, cutting parts for cutting this photosensitive paper into sheets of predetermined length, parts for charging the photosensitive layer by subjecting the surface of photosensitive layer of the photosensitive paper to a corona discharge, parts for image-exposing to a charged surface of photosensitive layer, parts for developing and parts for contacting the liquid developer containing toner with the surface of the photosensitive layer which has been image-exposed are disposed in a certain enumerated order along the conveying path of the photosensitive paper.
  • FIG. 1 is a longitudinal sectional view of one embodiment of electrophotographic apparatus in accordance with the present invention.
  • FIGS. 2 to 4 are longitudinal sectional views showing several embodiments of mechanisms for applying an insulating liquid to the surface of an electrophotographic material.
  • FIG. 1 this is a sectional view of electrophotographic apparatus according to the present invention.
  • numeral 1 represents a case in which the mechanisms of the apparatus are contained.
  • 2 is the web-like photosensitive paper wound in the form of a roll, the photosensitive paper being wound with its photosensitive surface facing outward.
  • the photosensitive paper 2 is withdrawn by means of rollers 3, 3, and transported to insulating liquid contacting mean (hereinafter called the preceeding bath).
  • the photosensitive paper may be directly contacted with the insulating liquid, but it is preferred to first pass the insulating liquid onto the surface of rollers or onto a porous material body, and then apply the insulating liquid to the surface of the photosensitive paper.
  • 4 is a vessel for storing the insulating liquid, which is passed to a container 6.
  • the insulating liquid 7 has high electric resistance and is a liquid of low dielectric constant.
  • a solvent of the hydrocarbon series which is relatively non-volatile, i,e., kerosene, decalin, etc.
  • solvents of the isoparaffln series for example, Isoper H, lsoper G, manufactured by the Esso Standard Oil Co., and the like, are typically used.
  • Oilsoluble resins, vegetable oils or silicone oil and the like may be mixed with the above-mentioned solvents, if desired.
  • a comparatively volatile solvent such as cyclohexane, n-heptane, n-octane, isooctane, gasoline or the like
  • the addition of these materials is preferred a for controlling the volatility of the insulating liquid.
  • the solvent be miscible with the liquid developer.
  • the insulating liquid must not dissolve or strongly'swell the photosensitive paper 2. From the results of experiments, it has been found that the liquid should an electric resistivity have more than 10 cm and a dielectric constant less than 3.5.
  • the insulating liquid 7 is scooped up by means of a roller 8, passed onto a roller 9, then onto a roller 10.
  • the insulating liquid 7 is applied to the photosensitive paper 2 on the photosensitive surface while the paper passes between rollers and 10.
  • the thickness of the liquid film applied to the photosensitive surface is preferably selected to be in the-range of from 0.1 ,u to 800 t, most preferably from 0.3 p to 300 a. If the thickness is too small, background density or fog increasesQand if it is too large the interior of the apparatus tends to be contaminated with liquid 7.
  • rollers 8 9 and 10 rollers made of metal or of an insulting material may be used.
  • The may be porous or of a rigid solid material.
  • Roller 10 is of the type such that when the apparatus is not in operation it moves upwardly along guide groove 11 away from roller 10.
  • the electric power is turned on and liquid 7 is fed from the roller 8 to the roller 9 and then to the peripheral surface of the roller 10. It is preferred that after this condition is reached the roller 10 approaches the photosensitive paper 2. It has been found that when insulating liquid 7 was applied to the surface of the photosensitive layer the background density decreased remarkably.
  • the photosensitive paper is then passed to the cutting part.
  • the holding plate 12 for holding the photosensitive paper is movable upwards and downwards, and after photosensitive paper of a predetermined length 'has passed by the cutting part, it holds the photosensitive paper, cooperating with a holding plate 12', while cutter blade 13 moves downwards and cuts the photosensitive paper into sheets of the desired length.
  • the roller 10 moves upwards and holding plate 12 moves downwards and holds the photosensitive paper.
  • the photosensitive paper is then passed by means of rollers 14 and 14 towards a charging zone.
  • 15 is a well known corona discharging device.
  • corona ions penetrate the liquid film and electrostatically charge the surface of the photosensitive layer.
  • the inventors of the present invention have found that, if any insulating liquid film exists on the surface of the photosensitive layer the surface is charged to a 10 to percent higher potential, as compared to the case where the liquid film is not present.
  • the inventors of the present invention have found that when such a surface was charged in the presence of the liquid film to the same potential as in the case where the liquid film did not exist, the number of pin-holes decreased.
  • the charged photosensitive paper is then passed to an image exposing zone by rollers 16 and 17.
  • the roller 16 is a roller provided with a flange which holds only the end portion of the photosensitive paper.
  • the image exposing zone is one side of an endless belt 21.
  • the endless belt 21 is of a permeable material or has a number of holes, and is actuated by rollers 18, 19 and 20.
  • Rollers 23 and 23 are guide rollers which hold only the side end portions of the sheet-like photosensitive paper.
  • the endless belt and the air with drawing device be made of an oil-resistant material, and have filters which adsorb liquid droplets.
  • the manuscript to be copied is placed on a glass support 24 with the surface to be transferred turned downwards.
  • the manuscript is illuminated by means of light sources 25 and 25'.
  • the light image is formed, by
  • the image exposure light may be a stationary exposure light or a scanning exposure light.
  • rollers 28 and 28' are guide rollers, roller 28 being a roller with a flange disposed in a manner that it holds only the end portion of the photosensitive paper.
  • Liquid developer 29 contained in a vessel 30 is scooped up by means of a pump (not shown in the drawing) and is sprinkled from nozzles 31 onto the upper surface of developping rollers 32 which rotate synchronized with the transportation speed of the photosensitive paper.
  • 33 is a developing electrode disposed so as to not contact the surface of the photosensitive paper.
  • Rollers 34 are guide rollers.
  • Rotary developing rollers 32 are all provided with flanges disposed in a manner that only the end portions contact the photosensitive paper.
  • the surface of the photosensitive paper is allowed to contact the developing rollers 32.
  • developing rollers 32 and developing electrode 33 it is prefered that their surfaces be electrically conductive, and they be grounded in the posiposi. process. It is not advisable that the surface of the photosensitive paper, rollers 32 and electrode 33 make direct electrical contact.
  • a biasing voltage is impressed between the roller 32, the electrode 33, and the photosensitive paper.
  • 35 is a guide plate which determines the conveying path of the sensitive paper.
  • 36 is a cover which prevents volatilization ofthe carrier liquid in the liquid developer.
  • Liquid developer 29 can be any well known developer which contains fine toner particles dispersed in a carrier liquid having high electric resistance. Typical of such developers are those wherein a pigment is dispersed with dispersion stabilizer and electric charge controller in a carrier liquid such as cyclohexane, decalin, kerosene, mineral spirits, gasoline, isoparaffin series solvents, chlorofluorohydrocarbon solvents, and the like.
  • the inventors of the present invention have found that when an electrostatic latent image is formed on a photosensitive paper having a liquid film of insulating liquid 7 thereon, an image of high optical density is obtained, compared to the case in which the image is formed on a photosensitive paper which has an electrostatic image of the same potential and no liquid film. This is believed to be due to the fact that the latent image is protected from the attackof ionic substances or impurities in the developer, and the life of the latent image is thereby prolonged.
  • photosensitive paper is passed between a pair of squeezing rollers 37 and 37' and excess developer wetting the surface of the photosensitive paper is removed.
  • the sheet-like photosensitive paper is then dried by an air stream coming from a fan 39 in drying zone 38. If an air stream which has been used to cool the light sources 25 and 25' is utilized, drying is further accelerated.
  • FIGS. 2 to 4 examples of other forms of the apparatus in which an insulating liquid is applied onto a photosensitive paper prior to electrostatic charging are shown.
  • the insulating liquid 7 is contained in a vessel 41 provided with a stop cock 40 in the upper portion thereof.
  • the stop cock 40 is opened.
  • the liquid 7 passes through a porous body 42 (for example, felt) situated at thebottom of the vessel 41, and is applied to the photosensitive paper 2 which is moving from left to right.
  • the surface of photosensitive paper to which the liquid 7 is applied is naturally the surface of the photosensitive layer side.
  • a liquid film 43 is formed on the surface of the photosensitive paper.
  • the stop cock 40 is closed when the apparatus is out of operation, and prevents the natural flow of liquid 7.
  • the container is provided with two rollers 44 and 45 at its bottom. By the rotation of these rollers, the insulating liquid 7 is conveyed onto the surface of photosensitive paper, and a liquid film 43 is formed.
  • FIG. 4 shows apparatus in which a liquid film is formed on both sides of the photosensitive paper.
  • the latter is conveyed into the insulating liquid 7 by means of guide rollers 46 and 47.
  • the photosensitive paper 2, guided by roller 48 and guide plate 49 then passes between squeezing rollers 50 and 51.
  • the thickness of the liquid film formed on the front back side of the photosensitive paper is determined by the pressure between the squeezing rollers. In this apparatus the occurence of fog on the back side of photosensitive paper is also prevented.
  • the insulating liquid layer is formed before charging in the present invention, a duplication image is obtained in which fog is remarkably reduced, having few pin-holes, and the image density is extraordinarily high, compared to conventional duplicators where the same photosensitive paper and the same liquid developer are used. Further, in this apparatus an insulating liquid is'applied onto the surface of a web-like photosensitive paper before it is cut into sheets and chips are not produced at all, and do not scatter. Accordingly, even when the duplication is repeatedly effected many times, the interior of the apparatus remains remarkably clean, and any problem as mentioned above due to cutting chips does not occur. In other words, various problems such as extremely moisture-absorbent cutting chips attaching to metallic (rust insulation of electric circuits being damaged, uneveness of charge cutting chips attaching to theoptical system reflecting mirror being corroded,
  • An electrophotographic apparatus characterized by means for coating a photosensitive'layer surface of a web-like photosensitive electrophotographic paper with a liquid having high electric resistivity and low dielectric constant and miscible with a carrier liquid of an electrophotographic developer, means for cutting said photosensitive paper while said paper is still wet with a layer of said liquid having high electric resistance, said paper being cut into sheets of a determined length, means for effecting corona discharge of the surface of said photosensitive layer of said cut paper so as to charge said photosensitive layer, means for imageexposing the photosensitive layer and means for applying liquid developer containing toner to the surface of said image-exposed photosensitive layer, said aforementioned means being disposed in the order of the above enumeration along the transporting path of said 7 photosensitive paper, whereby upon cutting of said paper, dust like particles of said paper are not scattered due to the effect of said layer of said liquid having a high electric resistance.
  • liquid layer as an electric resistivity greater than 0. cm and a dielectric constant less than 3.5.
  • apparatus for producing an electrophotographic image comprising means for cutting a photosensitive paper, means for corona discharging the surface of said photosensitive paper, means for imageexposing said charged surface and means for developing said image-exposed surface with a liquid developer containing toner, the improvement comprising means for coating the surface of said photosensitive paper with a liquid having a high electric resistivity, a low dielectric constant and miscible with the liquid developer, said liquid coating means being disposed along the path of said paper and prior to the means for cutting said paper, said cutting means being so positioned with respect to said liquid coating means that the paper is cut while it is still wet with a layer of said liquid having a high electric resistivity so that upon cutting the said paper, dust like particles are not scattered due to the effect of said liquid having a high electric resistance, low dielectric constant and which is miscible with said liquid developer.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Liquid Developers In Electrophotography (AREA)
US21308771 1970-12-28 1971-12-28 Electrophotographic apparatus Expired - Lifetime US3806240A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12032770A JPS5124252B1 (enrdf_load_html_response) 1970-12-28 1970-12-28

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US3806240A true US3806240A (en) 1974-04-23

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Application Number Title Priority Date Filing Date
US21308771 Expired - Lifetime US3806240A (en) 1970-12-28 1971-12-28 Electrophotographic apparatus

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US (1) US3806240A (enrdf_load_html_response)
JP (1) JPS5124252B1 (enrdf_load_html_response)
BE (1) BE776739A (enrdf_load_html_response)
CA (1) CA963077A (enrdf_load_html_response)
DE (1) DE2162913A1 (enrdf_load_html_response)
FR (1) FR2120798A5 (enrdf_load_html_response)
GB (1) GB1361839A (enrdf_load_html_response)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4198156A (en) * 1979-03-26 1980-04-15 International Business Machines Corporation Optics contamination prevention utilizing a coanda air deflection system
US4416531A (en) * 1980-10-20 1983-11-22 Ricoh Company, Ltd. Electrophotographic copying apparatus and subsystems therefor
US5155534A (en) * 1989-09-29 1992-10-13 Ricoh Company, Ltd. Apparatus for forming and developing latent electrostatic images with liquid developer and release agent

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3493299A (en) * 1966-08-25 1970-02-03 Pitney Bowes Inc Sheet conveying means for copying machines
US3512965A (en) * 1963-07-12 1970-05-19 Australia Res Lab Electroprinting method
US3540885A (en) * 1966-01-27 1970-11-17 Fuji Photo Film Co Ltd Reduction of fog formation in an electrophotographic light sensitive sheet
US3642471A (en) * 1969-09-19 1972-02-15 Xerox Corp Liquid developing process in an electrostatographic imaging system
US3653757A (en) * 1970-02-05 1972-04-04 Apeco Corp Web fed photocopy machine having improved length setting and cutting means

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4212559Y1 (enrdf_load_html_response) * 1966-12-06 1967-07-14

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3512965A (en) * 1963-07-12 1970-05-19 Australia Res Lab Electroprinting method
US3540885A (en) * 1966-01-27 1970-11-17 Fuji Photo Film Co Ltd Reduction of fog formation in an electrophotographic light sensitive sheet
US3493299A (en) * 1966-08-25 1970-02-03 Pitney Bowes Inc Sheet conveying means for copying machines
US3642471A (en) * 1969-09-19 1972-02-15 Xerox Corp Liquid developing process in an electrostatographic imaging system
US3653757A (en) * 1970-02-05 1972-04-04 Apeco Corp Web fed photocopy machine having improved length setting and cutting means

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4198156A (en) * 1979-03-26 1980-04-15 International Business Machines Corporation Optics contamination prevention utilizing a coanda air deflection system
US4416531A (en) * 1980-10-20 1983-11-22 Ricoh Company, Ltd. Electrophotographic copying apparatus and subsystems therefor
US5155534A (en) * 1989-09-29 1992-10-13 Ricoh Company, Ltd. Apparatus for forming and developing latent electrostatic images with liquid developer and release agent

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Publication number Publication date
JPS5124252B1 (enrdf_load_html_response) 1976-07-22
CA963077A (en) 1975-02-18
DE2162913A1 (de) 1972-07-20
BE776739A (fr) 1972-04-04
FR2120798A5 (enrdf_load_html_response) 1972-08-18
GB1361839A (en) 1974-07-30

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KR840002379B1 (ko) 전자사진 복사장치의 내장식 토너 카트리지