US3722994A - Method and device for removing developing liquid - Google Patents
Method and device for removing developing liquid Download PDFInfo
- Publication number
- US3722994A US3722994A US00041151A US3722994DA US3722994A US 3722994 A US3722994 A US 3722994A US 00041151 A US00041151 A US 00041151A US 3722994D A US3722994D A US 3722994DA US 3722994 A US3722994 A US 3722994A
- Authority
- US
- United States
- Prior art keywords
- developing liquid
- photosensitive member
- excessive developing
- excessive
- corona discharge
- 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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Classifications
-
- 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
- G03G15/11—Removing excess liquid developer, e.g. by heat
Definitions
- ABSTRACT A method and device used with an electronic photocopying apparatus and -for removing any residual developing solution from a photosensitive member by the use of a corona discharger to thereby provide a perfect copy of an original image.
- the prior art has employed means such as rollers for squeezing the residual developing solution on the photosensitive member or moisture absorbing means or the like to thereby remove such residual material.
- Such types of means may also remove even the developing solution required to visualize the electrostatic image SUMMARY OF THEINVENTION It is an object of the present invention to eliminate the above-described inconveniences and to remove only the unnecessary developing solution from a photosensitive member, thereby producing a vivid or clear reproduction of an original image.
- electric charges ofa certain polarity are uniformly applied through corona discharging to the surface of developing solution in either direction with respect to the developed photosensitive member or to the developing device.
- the uniform electric charges of the same polarity in the surface of the developing solution repulse one another to thereby reduce the surface tension of the liquid.
- the electrically charged surface of the liquid is further concaved due to the coulomb force with respect to the electric charges of the opposite polarity produced on the photosensitive member.
- any residual liquid on the photosensitive member is forced to be completely swept out of the electrically charged area of the photosensitive member, whereby there is formed a perfect, flawless reproduction or copy of an original image.
- FIGS. 1 to 4 are schematic views illustrating the operation of the present invention
- FIGS. 5 and 6 are fragmentary sectional views showing embodiments of the present invention.
- FIG. 7 shows another form of the present invention as applied to an electronic photocopying apparatus.
- FIG. 1 there is shown the manner in which a photosensitive member 1 bearing thereon a negatively charged electrostatic latent image is developed by developing solution 2 so that positive toner 3 sticks to the latent image.
- electrically charging means 10 such as corona discharger as shown in FIG. 2
- the electric charges applied to the surface of the developing solution 2 will stick to the molecules of the liquid, which are thereby formed into ionized molecules.
- These ionized molecules of the liquid repel one another because they are of the same polarity, and strive to move with a force F in parallel to the surface of the liquid.
- the portion of the liquid which has been electrically charged decreases its effective surface tension and provides a high degree of fluidity.
- the electric charges E sticking to the liquid molecules in the surface of the developing solution produce a force F which strives to depress or concave the liquid surface due to the coulomb force with respect tothe corresponding electric charges E on the photosensitive member 1. Consequently, as shown in FIG. 3, a concave develops very v appreciably in that portion of the electrically charged liquid disposed right below the corona discharger 10. Therefore, the excessive portion of the liquid can be removed by removing that portion of the liquid forming the convex part of the liquid. Alternatively, removal of such excessive liquid portion can be accomplished by moving the corona discharger 10 along the surface of the liquid in the manner as shown in FIG. 4, to thereby force the excessive liquid to be displaced for removal.
- FIG. 5 shows the present invention as applied to a photosensitive film with a mount for slide.
- the photosensitive film, the electrically charging means and the developing solution are designated by numeral 11, I0 and 13, respectively.
- a fixing infrared ray lamp l2 suction means 14 for sucking removed liquid
- a mount 15 for holding the photosensitive film 11 After subjected to the preceding processes, such as electric charging, exposure and development, the photosensitive film 11 is carried to the station provided with the shown electric charger, fixing lamp, etc.
- the electric charger is moved to scan the photosensitive film so as to remove any residual excessive portion 'of the developing solution from the photosensitive film.
- Such residual liquid portion is brought to the junction area between the film and the mount and then sucked by the suction means 14 for removal.
- the surface of the photosensitive film is now substantially dry and it is further subjected to heat radiation applied from the fixing infrared ray lamp 12 or to hot air applied from any other suitable means, whereby the film is completely fixed by heating.
- the quantity of heat required for this purpose may be very small.
- the suction means 14 for sucking the excessive liquid may take a tubular form,
- the electric charges required for the charge-squeezing should desirably be of a polarity which will never malaffect the reproduction of an original image, and in this sense the negative polarity is preferred for the primary charges while the positive polarity is preferred for the use with a positive developingtoner.
- the illustrated embodiment of FIG. shows the surface of the film to be developed as facing downward, whereas such surface of the film may face either downward or upward as desired.
- Such a system may comprise a corona discharger disposed adjacent to the outlet portion of a developing device in the direction of movement of a photosensitive member a, so that the residual portion of the developing solution b sticking to the photosensitive member a is electrically charged with a polarity for reducing the sticking force, whereby that residual portion of the developing solution b drops on the developing device 21 from its own weight.
- the developing device 21 may be so arranged that the photosensitive member a is directly dipped in the body of developing solution b, but such arrangement may result in an inconvenience that the developing solution b sticks to both surfaces of the photosensitive member a. Therefore, as shown in FIG. 7, a pump 22.is disposed within the developing device 21 to inject the developing solution b through a nozzle 23 onto the image-bearing surface of the photosensitive member a. Further, an arcuate developing electrode 24 is extended from the nozzle means to define a wedgeshaped flow passage 26 through cooperation with the photosensitive member a, so that turbulent flow of the developing solution b is provided in the wedge-shaped flow passage 26. This arrangement always ensures only the image-bearing surface of the photosensitive member to be effectively exposed to fresh developing solution.
- the corona discharger 10 has therein filaments 25 of tungsten or like material having a diameter in order of 5/100 to 10/100 mm and disposed perpendicularly to the path of the photosensitive member a.
- a high voltage is applied from a power source 27 to the corona discharger 10 to cause corona discharge.
- the photosensitive member a is moved first downwardly and then upwardly depicting a U-shaped path along a rotating drum 28.
- an electrically charging means 29 for forming an optical frame on the photosensitive member
- an optical system 30 for forming an optical frame on the photosensitive member
- a developing device 21 for forming an optical frame on the photosensitive member
- a corona discharger 10 for forming an optical frame on the photosensitive member
- a drier 31 a lateral type arrangement in which the photosensitive member follows a laterally U-shaped path, or a circular typearrangement in which the photosensitive member is moved entirely circularly around the rotating drum, or a flat type arrangement in which the photosensitive member is moved horizontally in one direction.
- the present invention eliminates the direct contact between the image-bearing surface of the phtosensitive member and the squeezing rollers which has existed in the prior art device, and this results in a perfect or flawless image reproduction having a highly excellent resolving effect.
- the device of the present invention achieves highly efficient removal of any residual developing solution from the photosensitive member, which in turn leads to a lesser production or evaporation of the solvent during the drying process, and accordingly to a greater hygienical advantage.
- the removal of thedeveloping solution form the photosensitive member is accomplished independently of the surface conditions thereof, and this means a highly stable removing effect which also means the elimination of any mechanical adjustment for such removal.
- a method of removing excessive developing liquid from the surface of a photosensitive member comprising:
- a method of removing excessive developing liquid as in claim 1 wherein said excessive developing liquid is drawn off said photosensitive member by suction.
- a method of removing excessivedeveloping liquid as in claim 1 wherein said excessive developing liquid is drawn off by sucking developing liquid at a predetermined height above said surface of the photosensitive member.
- a method of removing excessive developing liquid as in claim 1 wherein said excessive developing liquid is drawn off by moving said corona discharger relative to said photosensitive member.
- a method of removing excessive developing liquid from the surface of a photosensitive member bearing an electrophotographic image visualized with toner of one polarity comprising:
- a method of removing excessive developing liquid as in claim 6 wherein said excessive developing liquid is drawn off by sucking developing liquid at a predetermined height above said surface of the photosensitive member.
- a method of removing excessive developing liquid as in claim6 wherein said excessive developing liquid is drawn off by moving said corona discharger relative to said photosensitive member.
- a method of removing excessive developing liquid from the surface of a photosensitive member comprising:
- a method of removing excessive developing liquid from the surface of a photosensitive member comprising:
- an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising:
- corona discharge means positioned relative to said photosensitive member bearing said excessive developing liquid for depositing electric charge of a predetermined polarity uniformly thereon, and means for drawing off excessive developing liquid from said surface of the photosensitive member.
- an apparatus as in claim 12 wherein said means for drawing off excessive developing liquid includes vacuum suction means for forcibly sucking removable developing liquid from said surface of the photosensitive member.
- an apparatus as in claim 12 wherein said means for drawing off excessive developing liquid includes means causing relative movement between said corona discharge means and said photosensitive means.
- an apparatus as in claim 14 further comprising means establishing said relative movement between said photosensitive means and said corona discharge means in a direction whereby said developing liquid is dripped off.
- an apparatus for removing excessive developing liquid from the surface of a photosensitive member bearing an electrophotographic image visualized with toner of one polarity comprising:
- corona discharge means positioned relative to said photosensitive member for depositing electric charge of the same polarity as said one polarity of said toner uniformly thereon, and
- an apparatus as in claim 16 wherein said means for drawing off excessive developing liquid includes vacuum suction means for forcibly sucking removable developing liquid from said surface of the photosensitive member.
- an apparatus as in claim 16 wherein said means for drawing off excessive developing liquid includes means causing relative movement between said corona discharge means and said photosensitive means.
- an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising:
- corona discharge means positioned relative to said photosensitive member for decreasing the effective surface tension of said developing liquid thereon and providing same with a high degree of fluidity, and means for drawing off excessive developing liquid.
- an apparatus for removing excessive developing liquid from the surface of a photosensitive member comprising:
- corona discharge means positioned relative to said photosensitive member for depressing the surface of said developing liquid, and means for drawing 1 off at least a portion of the developing liquid displaced by the depression of said surface.
- an apparatus for removing excessive developing solution from the surface of a photosensitive member comprising:
- corona discharge means positioned relative to said photosensitive member for subjecting said surface bearing said excessive developing liquid to electric charge of a predetermined polarity
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Wet Developing In Electrophotography (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP44044164A JPS49608B1 (de) | 1969-06-04 | 1969-06-04 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3722994A true US3722994A (en) | 1973-03-27 |
Family
ID=12683940
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00041151A Expired - Lifetime US3722994A (en) | 1969-06-04 | 1970-05-25 | Method and device for removing developing liquid |
Country Status (3)
Country | Link |
---|---|
US (1) | US3722994A (de) |
JP (1) | JPS49608B1 (de) |
GB (1) | GB1317828A (de) |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3804659A (en) * | 1970-12-10 | 1974-04-16 | Fuji Photo Film Co Ltd | Electrophotographic reversal development process for enhancing the quality of the developed image |
US3893419A (en) * | 1973-12-26 | 1975-07-08 | Xerox Corp | Background reduction technique |
US3933490A (en) * | 1971-11-04 | 1976-01-20 | Canon Kabushiki Kaisha | Improvements in transfer electrophotography |
US3957016A (en) * | 1972-09-29 | 1976-05-18 | Canon Kabushiki Kaisha | Developer wringing and removing apparatus |
US3972611A (en) * | 1970-03-18 | 1976-08-03 | Canon Kabushiki Kaisha | Apparatus for transferring images produced by liquid developer |
US4021586A (en) * | 1970-10-08 | 1977-05-03 | Canon Kabushiki Kaisha | Method of and means for the development of electrostatic images |
DE2739104A1 (de) * | 1976-12-03 | 1978-06-08 | Canon Kk | Elektrophotographische nasskopiervorrichtung |
US4168119A (en) * | 1974-12-27 | 1979-09-18 | Canon Kabushiki Kaisha | Electrophotographic copying apparatus utilizing liquid developer |
US4357096A (en) * | 1981-03-06 | 1982-11-02 | Eastman Kodak Company | Dispersion supply apparatus for photoelectrophoretic migration imaging |
US5023665A (en) * | 1990-06-27 | 1991-06-11 | Xerox Corporation | Excess liquid carrier removal apparatus |
US5815779A (en) * | 1996-05-17 | 1998-09-29 | Xerox Corporation | System for conditioning liquid ink in a liquid ink type electrostatographic system |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3322048A (en) * | 1958-09-23 | 1967-05-30 | Harris Intertype Corp | Electrophotography |
US3349676A (en) * | 1965-04-02 | 1967-10-31 | Xerox Corp | Xerographic development electrode apparatus |
US3372027A (en) * | 1964-05-15 | 1968-03-05 | Xerox Corp | Xerographic liquid development |
US3405682A (en) * | 1964-06-08 | 1968-10-15 | Xerox Corp | Xerographic development apparatus with web loading means to remove residual developer |
US3411482A (en) * | 1967-01-30 | 1968-11-19 | Varian Associates | Electrographic toner development employing a clean-up electrode structure for removing unwanted background |
US3532054A (en) * | 1966-10-03 | 1970-10-06 | Varian Associates | Electrostatic copy method employing pressure sensitive transfer of dielectric to form a master |
US3543410A (en) * | 1969-05-08 | 1970-12-01 | Eastman Kodak Co | Method of removing moisture from a web of material |
US3554161A (en) * | 1968-11-14 | 1971-01-12 | Addressograph Multigraph | Developing apparatus |
US3576623A (en) * | 1968-02-23 | 1971-04-27 | Xerox Corp | Development system employing a coronode immersed in a liquid developer |
-
1969
- 1969-06-04 JP JP44044164A patent/JPS49608B1/ja active Pending
-
1970
- 1970-05-25 US US00041151A patent/US3722994A/en not_active Expired - Lifetime
- 1970-05-29 GB GB2612270A patent/GB1317828A/en not_active Expired
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3322048A (en) * | 1958-09-23 | 1967-05-30 | Harris Intertype Corp | Electrophotography |
US3372027A (en) * | 1964-05-15 | 1968-03-05 | Xerox Corp | Xerographic liquid development |
US3405682A (en) * | 1964-06-08 | 1968-10-15 | Xerox Corp | Xerographic development apparatus with web loading means to remove residual developer |
US3349676A (en) * | 1965-04-02 | 1967-10-31 | Xerox Corp | Xerographic development electrode apparatus |
US3532054A (en) * | 1966-10-03 | 1970-10-06 | Varian Associates | Electrostatic copy method employing pressure sensitive transfer of dielectric to form a master |
US3411482A (en) * | 1967-01-30 | 1968-11-19 | Varian Associates | Electrographic toner development employing a clean-up electrode structure for removing unwanted background |
US3576623A (en) * | 1968-02-23 | 1971-04-27 | Xerox Corp | Development system employing a coronode immersed in a liquid developer |
US3554161A (en) * | 1968-11-14 | 1971-01-12 | Addressograph Multigraph | Developing apparatus |
US3543410A (en) * | 1969-05-08 | 1970-12-01 | Eastman Kodak Co | Method of removing moisture from a web of material |
Cited By (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3972611A (en) * | 1970-03-18 | 1976-08-03 | Canon Kabushiki Kaisha | Apparatus for transferring images produced by liquid developer |
US4021586A (en) * | 1970-10-08 | 1977-05-03 | Canon Kabushiki Kaisha | Method of and means for the development of electrostatic images |
US3804659A (en) * | 1970-12-10 | 1974-04-16 | Fuji Photo Film Co Ltd | Electrophotographic reversal development process for enhancing the quality of the developed image |
US3933490A (en) * | 1971-11-04 | 1976-01-20 | Canon Kabushiki Kaisha | Improvements in transfer electrophotography |
US3957016A (en) * | 1972-09-29 | 1976-05-18 | Canon Kabushiki Kaisha | Developer wringing and removing apparatus |
US3893419A (en) * | 1973-12-26 | 1975-07-08 | Xerox Corp | Background reduction technique |
US4168119A (en) * | 1974-12-27 | 1979-09-18 | Canon Kabushiki Kaisha | Electrophotographic copying apparatus utilizing liquid developer |
DE2739104A1 (de) * | 1976-12-03 | 1978-06-08 | Canon Kk | Elektrophotographische nasskopiervorrichtung |
US4357096A (en) * | 1981-03-06 | 1982-11-02 | Eastman Kodak Company | Dispersion supply apparatus for photoelectrophoretic migration imaging |
US5023665A (en) * | 1990-06-27 | 1991-06-11 | Xerox Corporation | Excess liquid carrier removal apparatus |
US5815779A (en) * | 1996-05-17 | 1998-09-29 | Xerox Corporation | System for conditioning liquid ink in a liquid ink type electrostatographic system |
Also Published As
Publication number | Publication date |
---|---|
DE2025765A1 (de) | 1970-12-10 |
JPS49608B1 (de) | 1974-01-09 |
GB1317828A (en) | 1973-05-23 |
DE2025765B2 (de) | 1975-10-30 |
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