US3766887A - Developing device for electrostatic latent image - Google Patents

Developing device for electrostatic latent image Download PDF

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Publication number
US3766887A
US3766887A US00105052A US3766887DA US3766887A US 3766887 A US3766887 A US 3766887A US 00105052 A US00105052 A US 00105052A US 3766887D A US3766887D A US 3766887DA US 3766887 A US3766887 A US 3766887A
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United States
Prior art keywords
endless belt
liquid developer
developing
electrophotographic
sheet material
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
US00105052A
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English (en)
Inventor
M Sato
O Fukushima
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 US3766887A publication Critical patent/US3766887A/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
    • G03G15/06—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

  • ABSTRACT An apparatus for developing an electrostatic latent image which comprises a plurality of developing units in series for conveying electrophotographic material smoothly therethrough, each unit comprising (a) a downwardly inclined endless belt provided with protruding ridges along the sides of a surface thereof for conveying electrophotographic sheet material and further provided with an electroconductive layer and (b) a driving mechanism for the endless belt, a plurality of liquid developer feeding nozzles and side plates respectively associated with the developing units disposed at points lower than the path of the electrophotographic sheet material and further disposed, for each developing unit, at the proximity of the uppermost portion of the endless belt, and means contacting the endless belt under the feeding nozzles for cleaning the endless belt thereby holding the liquid developer in a concave part formed by the endless belt, side plates, developer feeding nozzles and the cleaning means, the endless belt feeding the liquid developer thus held in the concave part to the electrophotographic sheet
  • This invention relates to an apparatus for liquid development of electrostatic latent image formed on an electrophotographic material, and particularly to a developing apparatus capable of providing satisfactory image quality without showing streaks? on the image even developed at a higher speed.
  • FIGS. 1 and 2 are schematic cross-sectional side views of the conventional developing apparatus for electrostatic latent image. 7
  • FIG. 3 is a schematic side view of an example ofdeveloping apparatus-embodying this invention.
  • FIGS. 4 and 5 are perspective view of principal portion and cross sectional side view, respectively, of the apparatus of FIG. 3.
  • the means of supplying liquid developer can be represented as in FIG. 1 or FIG. 2 according to its principle.
  • the apparatus of FIG. 1 in which liquid developer 14 is introducedbetween the surface 11 holding latent image and the developing electrode 12 essentially involves adrawback in resulting streaks on the image due to the presence of relative speed between the surface 11 and the liquid developer. Said streaks becomemore marked when the distance between the surface holding the latent image and the developing electrode is small, and therefore the developing apparatus of this type is not suitable for obtaining continuous tone image of high quality ata high speed.
  • FIG. 2 shows an example of developing apparatus whichis designed so as not to form relative speed between the surfaceholding the latentimage and the liquid developer, in order to suppress the phenomenon of streaks.
  • drum 21 is rotated in the direction of arrow 23, and thelower part of said drum is immersedinto the liquid developer 25 contained in a container-24.
  • the drum 21 is brought into contact with theliquiddeveloper at the lower part thereof and forms thin layer of said liquid developer onfthe surface thereof, andbrings the thin layer th'usformed upwards.
  • the sheet 11 with the latent image formed thereon is advanced above said drum 21 in the direction of arrow 22 and is brought into contact with.
  • the present invention is to provide a developing apparatus capable of realizing development at a high speed without employing the developing liquid of high concentration and high viscosity, and furthermore without showing streaks on the image obtained.
  • FIG. 3 shows the schematic cross-sectional sideview of an apparatus embodying the present invention adapted for processing electrophotographic sheet material carrying electrostatic latent image thereon.
  • theelectrophotographic material 101 (hereinafter expressed as the sheet) is supplied into the apparatus by means of a pair of pinch rollers 102 and 103 with the image-holding surface down.
  • Said pinch roller 103 is composed of sponge or insulating rubber in order to apply insulating prebath solution to said image-holding surface.
  • Said prebath solution prevents the formation of fogging on the electrophotographic image to be obtained.
  • the sheet 101 treated with prebath solution is subjected to development on an endless belt 106 driven in the same direction with cm, respectively.
  • the liquid developer is supplied from the holes provided on the wall of pipe 205 to the gap between the sheet 101 and the endless belt 106, and the development of latent image carried on the sheet 101 is carried out using said endless belt 106 as the developing electrode.
  • the streak on the image obtained is prespeed between the surface holding the latent image and the liquid developer is made very small and the streaks of the image is prevented if the peripheral speed of drum 21' is substantially equal tothe advancing speed of said sheet 11.
  • a roller 209 is provided in order to maintain the distance between the sheet 101 and theendless belt 106 sandwiching the liquid developer therebetween and is driven by the movement of the sheet 101.
  • the upper surface of said endless belt l06 is inclined a little, as shown in the drawing, in order to facilitate the supply of liquid developer.
  • the toner image formed remains intact since the endless belt 106 and the sheet 101 are maintained at a same speed and because of the presence of said liquid.
  • the last endless belt 112 is inclined in the opposite direction with respect to others in order to prevent the flowing of liquid developer into the succeeding processing stage.
  • the use of plural endless belts intends to prolongate the developing time in order to obtain sufficient developing density and to compensate the unevenness in the developing resulting from uneven supply of liquid developer.
  • FIGS. 4 and 5 are the perspective view of the principal part and cross sectional side view, respectively.
  • the mechanism is further provided with a side plate 202 supporting said pipe 205 at the extremities thereof .and preventing the leakage of liquid developer from the sides of said endless belts, a rigid curved plate 203 provided underv said pipe 205 and along the surface of said endless belt 206 'beng along the'surface of .the roller 107, and felt or sponge 204 attached to the lower surface of said rigid curved plate 204 and coming into contactl'with the surface of said endless belt 206.
  • the endless belt 206 is further provided with protruding ridges 201 at the sides thereof in order to prevent the leakage of liquid developer therefrom. Flanged rollers 207.
  • the sheet thus processed is reversed by curved lattice type guide 113, and placed on 'a chain or metal mesh endless belt driven by the rollers 115 and Y116.
  • Cleaning liquid sprayed from the nozzles 117, 118 and 119 cleans the both surfaces of the sheet 101 thus far provided with the pipe 205 by means of a pump (not a container 130 from the lowest end of the endless belt 106.
  • the liquid developer still remaining on said endless belt 106 is scraped off by the flannel or sponge 204 provided on the rigid curved plate 203.
  • the liquid developer collected in the container 130 is cycled again to the pipe 205 by a pump.
  • the sheet 101 having sufficient stiffness is automatically transferred to thesucceeding endless belt at the junctions of endless belts. If the sheet cannot have the sufficient stiffness for this purpose, it is recommended to provide a sep arating claw at'the part where the endcessed to remove excessive toner thereby preventing fogging and stain.
  • the cleaning liquid after use is recovered in the container 140. Also provided is a pair of squeeze rollers 116 and 120.
  • the apparatus of this invention prevents the formation of streaks" on the. image obtained since the sheet and the endless belt are advanced at a same speed, and enables to obtain the image of elevated optical density without employing liquid developer of high toner concentration since sufficient amount of developer can be supplied to the surface holding the latent image. This fact simultaneously prevents the formation of fogging or stain. Thus it is made possible to obtain the image of high quality by means of the apparatus of this invention.
  • each said unit comprisingla) a downwardly inclined endless belt provided with protruding ridges along the sides of a surface thereof for conveying electrophotographic sheet material and further provided with an electroconductive layer and (b) a driving mechanism for said endless belt, a plurality of liquid developer feeding nozzles and side plates respectively associated with said developing units disposed at points lower than the path of said electrophotographic sheet material and further disposed, for each developing unit, at the proximity of the uppermost portion of said endless belt, and means contacting said endless belt under said feeding nozzles for cleaning said endless belt thereby holding the liquid developer in a concave part formed by the endless belt, side plates, developer feeding nozzles and said cleaning means, said endless belt feeding the liquid developer thus held in the con-.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
US00105052A 1970-01-08 1971-01-08 Developing device for electrostatic latent image Expired - Lifetime US3766887A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP45002588A JPS5111929B1 (enrdf_load_stackoverflow) 1970-01-08 1970-01-08

Publications (1)

Publication Number Publication Date
US3766887A true US3766887A (en) 1973-10-23

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Application Number Title Priority Date Filing Date
US00105052A Expired - Lifetime US3766887A (en) 1970-01-08 1971-01-08 Developing device for electrostatic latent image

Country Status (8)

Country Link
US (1) US3766887A (enrdf_load_stackoverflow)
JP (1) JPS5111929B1 (enrdf_load_stackoverflow)
BE (1) BE761227A (enrdf_load_stackoverflow)
CA (1) CA932952A (enrdf_load_stackoverflow)
DE (1) DE2100493A1 (enrdf_load_stackoverflow)
FR (1) FR2075270A5 (enrdf_load_stackoverflow)
GB (1) GB1310092A (enrdf_load_stackoverflow)
NL (1) NL7100016A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910231A (en) * 1973-02-21 1975-10-07 Canon Kk Developing device for a polychromatic electrophotographic copier
US5369477A (en) * 1993-12-07 1994-11-29 Hewlett-Packard Company Liquid electrophotography fluid containment and belt tracking device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4515463A (en) * 1982-07-30 1985-05-07 Photon Chroma, Inc. Inclined toner flow control system for developing an electrostatic latent image upon an electrophotographic film

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442876A (en) * 1944-05-27 1948-06-08 Minnesota Mining & Mfg Method of making pressure-sensitive adhesive sheeting
US3308737A (en) * 1963-06-18 1967-03-14 Fuji Photo Film Co Ltd Device for applying a treating solution to sensitized copying paper
US3369523A (en) * 1965-08-11 1968-02-20 Azoplate Corp Apparatus for developing latent electrostatic images
US3566834A (en) * 1967-08-14 1971-03-02 Fuji Photo Film Co Ltd Electrophotographic developing device
US3601092A (en) * 1969-02-28 1971-08-24 Ricoh Kk Developing device for wet process electrophotography
US3643628A (en) * 1967-12-20 1972-02-22 Meyer L Sugarman Compact liquid toner apparatus with straight-through feed
US3669073A (en) * 1969-04-04 1972-06-13 American Photocopy Equip Co Electrostatic developing system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2442876A (en) * 1944-05-27 1948-06-08 Minnesota Mining & Mfg Method of making pressure-sensitive adhesive sheeting
US3308737A (en) * 1963-06-18 1967-03-14 Fuji Photo Film Co Ltd Device for applying a treating solution to sensitized copying paper
US3369523A (en) * 1965-08-11 1968-02-20 Azoplate Corp Apparatus for developing latent electrostatic images
US3566834A (en) * 1967-08-14 1971-03-02 Fuji Photo Film Co Ltd Electrophotographic developing device
US3643628A (en) * 1967-12-20 1972-02-22 Meyer L Sugarman Compact liquid toner apparatus with straight-through feed
US3601092A (en) * 1969-02-28 1971-08-24 Ricoh Kk Developing device for wet process electrophotography
US3669073A (en) * 1969-04-04 1972-06-13 American Photocopy Equip Co Electrostatic developing system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
R. W. Keyes, Liquid Crystal Electrophotographic Display, IBM Tech. Disclosure, Vol. 12, No. 12 May 1970. *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3910231A (en) * 1973-02-21 1975-10-07 Canon Kk Developing device for a polychromatic electrophotographic copier
US5369477A (en) * 1993-12-07 1994-11-29 Hewlett-Packard Company Liquid electrophotography fluid containment and belt tracking device
EP0657787A1 (en) * 1993-12-07 1995-06-14 Hewlett-Packard Company Liquid electrophotography fluid containment and belt tracking device

Also Published As

Publication number Publication date
DE2100493A1 (de) 1971-07-22
FR2075270A5 (enrdf_load_stackoverflow) 1971-10-08
BE761227A (fr) 1971-06-16
CA932952A (en) 1973-09-04
NL7100016A (enrdf_load_stackoverflow) 1971-07-12
GB1310092A (en) 1973-03-14
JPS5111929B1 (enrdf_load_stackoverflow) 1976-04-15

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