US3720183A - Transfer device for images by the use of liquid development electrophotography - Google Patents

Transfer device for images by the use of liquid development electrophotography Download PDF

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Publication number
US3720183A
US3720183A US00102529A US3720183DA US3720183A US 3720183 A US3720183 A US 3720183A US 00102529 A US00102529 A US 00102529A US 3720183D A US3720183D A US 3720183DA US 3720183 A US3720183 A US 3720183A
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United States
Prior art keywords
corona discharge
image receiving
lever
roller
recording
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
US00102529A
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English (en)
Inventor
S Suzuki
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.)
Ricoh Co Ltd
Original Assignee
Ricoh Co Ltd
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Filing date
Publication date
Application filed by Ricoh Co Ltd filed Critical Ricoh Co Ltd
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Publication of US3720183A publication Critical patent/US3720183A/en
Anticipated expiration legal-status Critical
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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
    • G03G15/14—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base
    • G03G15/16—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer
    • G03G15/169—Apparatus for electrographic processes using a charge pattern for transferring a pattern to a second base of a toner pattern, e.g. a powder pattern, e.g. magnetic transfer with means for preconditioning the toner image before the transfer

Definitions

  • the present invention relates to transfer devices for images by the use of liquid development electrophotography.
  • a liquid development electrophotographic copy paper for an or a second original has already been used in practice.
  • ZnO in the paper cannot be avoided and this paper absorbs ultraviolet rays the copy speed is slow and the sharpness of the image is not sufficient for practical use.
  • FIG. 1 is a diagrammatic elevation view of apparatus to show the principle of transfer according to the present invention
  • FIG. 2 is a longitudinal cross sectional view through a transfer device according to one embodiment of the present invention.
  • FIG. 3 is a fragmentary plan view of feed tables for paper to be transferred and transfer paper.
  • FIG. 1 is a paper 1 to be transferred, for example, an image 2 formed by a positive toner which is to be copied by liquid development electrophotography.
  • Copy paper 3 is made of transparent paper such as tracing paper and others the like.
  • the paper (recording material) to be transferred (i.e., having an image to be transferred) and the copy paper (image receiving material) 3 are fed in convergently so as to provide an intimately close gap between them, and a wetting liquid .4 with an appropriate volatility is introduced into the gap between the papers.
  • the toner'on the transfer paper 3 is wetted and softened and then swells.
  • the transfer paper 3 is shifted to a gap between corona discharge electrodes and subjected to a corona discharge from the side of the transfer paper, the toner is transferred to the transfer paper and thereby the image is transferred.
  • the corona discharge is formed between a grounded conductive ro'ller acting as an electrode and an opposed electrode positioned at a .predetermined distance above the roller.
  • FIG. 2 When a mainswitch 5 is turned on, a main motor 6 starts to rotate, and guide rollers 10 and 11 rotate in the direction shown by the arrowsbeing driven by sprocket wheels 7 and 8 and a chain 9. A pulley 14 is also rotated by a pulley 12 which is integral-with and coaxially fixed to the sprocket wheel 8 and acts through a round belt 13.
  • a cam 15 is supported coaxially and both are connected through a one revolution clutch.
  • a start button 16 When pushed, a lever 17, a paper stopper 18, a lever 19 and a lever 20 rotate clockwise around a shaft 21 and undergo displacement from the position depicted shown in broken lines to that by solid lines.
  • These rotating members have a tendency to rotate counterclockwise through the action of a spring 24 which is stretched between a pin 22 at the end of the lever 17 and another pin 23 mounted on a fixed part of the machine.
  • cam follower 25 adjacent the lever 17.
  • the cam 15 stops rotating.
  • the cam 15 rotates when the cam follower 25 is out of the recess 26 and slides around the external periphery of the cam 15.
  • a pumping motor 33 starts to rotate.
  • a wetting liquid 38 is poured into a tank 37 through an opening 36 of a pipe 35 by means of a pump 34. If the paper to be transferred and the transfer paper are placed on the feed tables 29 and 30, respectively, the wetting liquid is fed between the paper to be transferred and the transfer paper, and the toner which forms the image on the paper to be transferred is wetted, softened and swells to some extent.
  • each rotating member shifts to the position shown in solid lines around the shaft 21 as a center as described above cam follower 25 comes out of the recess 26 of the cam 15 and the cam 15 starts to rotate.
  • the cam follower 25 slides on the external periphery of the cam 15 and each rotating member remains in the position shown in solid lines.
  • the paper to be transferred and the transfer paper receive a corona discharge while on their way, and pass between guide rollers 10 and 39.
  • the image is then transferred as explained with above reference to FIG. 1.
  • the paper carrying the image to be transferred and the transfer paper are separated by a separating means, and if necessary, they are heated to be dried.
  • Element 40 is a grounded roller for the corona discharge
  • element 41 is a high-voltage power supply for the corona discharge.
  • An indication lamp 42 is lighted when the main switch is turned on.
  • the feed tables 29 and 30, upon which the paper 'to be transferred and the transfer paper are to be placed are respectively inclined downwardly and forwardly and their forward ends have comb shapes as shown in FIG. 3. Therefore, it is possible to see through them. At the same time, the wetting liquid flows down without dispersing on the tables more than is needed.
  • An image formed by a liquid development electrophotographic copy can be transferred upon a highly transparent paper by simple means.
  • Each of the feed tables for a paper to be transferred and a transfer paper has a forward end formed in the comb shape so as to enable easily viewing things underneath through the comb-shaped end, and it also makes the wetting liquid flow downward without dispersing on the tables in an amount more than is needed.
  • a device for transferring a toner image from a recording material to an overlaying image receiving material by wetting the toner image and applying a corona discharge electric field comprising separate slide-in channels for the recording material and the image receiving material which are guided into superposed relationship, a plurality of pairs of feed rollers defining a feed path for said materials, corona discharge means for producing a corona discharge normal to the surface of the superposed recording and image receiving materials, said channels including said one pair of said feed rollers being positioned in continuation of two vertically spaced, downwardly inclined and converging supporting plates for the sliding in of the recording and image receiving materials, a wetting agent feed pipe having an o ening arranged between said plates, one roller of sal one part being pivotally mounted, a pivotally mounted lever for pivoting one roller of said one pair to open a roller gap, and an arm attached to said lever for closing the feed path.
  • a device as claimed in claim 1 comprising a motor for driving at least some of said rollers, a cam driven by said motor and a cam follower attached to said lever and cooperating with the cam to determine a transfer cycle.
  • a device as claimed in claim 1 comprising a reservoir for said wetting agent and a pump for pumping said agent through said pipe.
  • a device as claimed in claim 1 comprising a switch for controlling said corona discharge means and means attached to said lever for operating said switch.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Electrostatic Charge, Transfer And Separation In Electrography (AREA)
  • Paper (AREA)
  • Printing Methods (AREA)
  • Wet Developing In Electrophotography (AREA)
  • Electrophotography Using Other Than Carlson'S Method (AREA)
US00102529A 1967-11-08 1970-12-29 Transfer device for images by the use of liquid development electrophotography Expired - Lifetime US3720183A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7177867 1967-11-08

Publications (1)

Publication Number Publication Date
US3720183A true US3720183A (en) 1973-03-13

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ID=13470349

Family Applications (1)

Application Number Title Priority Date Filing Date
US00102529A Expired - Lifetime US3720183A (en) 1967-11-08 1970-12-29 Transfer device for images by the use of liquid development electrophotography

Country Status (3)

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US (1) US3720183A (enrdf_load_stackoverflow)
DE (1) DE1804367B2 (enrdf_load_stackoverflow)
GB (1) GB1253061A (enrdf_load_stackoverflow)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565370A (en) * 1947-03-06 1951-08-21 Ditto Inc Moistening means for duplicating machines
US2951443A (en) * 1956-12-27 1960-09-06 Haloid Xerox Inc Image reproduction
US3120446A (en) * 1961-02-01 1964-02-04 Xerox Corp Method of transferring a developed solid particulate image
US3202526A (en) * 1961-10-05 1965-08-24 Scm Corp Method and apparatus for liquid development of latent images
US3281241A (en) * 1962-07-02 1966-10-25 Xerox Corp Method of forming a visual record of a latent image on an image receiving web
US3372027A (en) * 1964-05-15 1968-03-05 Xerox Corp Xerographic liquid development
US3556784A (en) * 1963-07-24 1971-01-19 Eastman Kodak Co Electrostatic image development
US3596635A (en) * 1967-03-16 1971-08-03 Bell & Howell Co Electrostatographic office copier

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2565370A (en) * 1947-03-06 1951-08-21 Ditto Inc Moistening means for duplicating machines
US2951443A (en) * 1956-12-27 1960-09-06 Haloid Xerox Inc Image reproduction
US3120446A (en) * 1961-02-01 1964-02-04 Xerox Corp Method of transferring a developed solid particulate image
US3202526A (en) * 1961-10-05 1965-08-24 Scm Corp Method and apparatus for liquid development of latent images
US3281241A (en) * 1962-07-02 1966-10-25 Xerox Corp Method of forming a visual record of a latent image on an image receiving web
US3556784A (en) * 1963-07-24 1971-01-19 Eastman Kodak Co Electrostatic image development
US3372027A (en) * 1964-05-15 1968-03-05 Xerox Corp Xerographic liquid development
US3596635A (en) * 1967-03-16 1971-08-03 Bell & Howell Co Electrostatographic office copier

Also Published As

Publication number Publication date
DE1804367B2 (de) 1971-08-19
GB1253061A (enrdf_load_stackoverflow) 1971-11-10
DE1804367A1 (de) 1969-06-12

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