US3608523A - Trostatic toning apparatus - Google Patents

Trostatic toning apparatus Download PDF

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Publication number
US3608523A
US3608523A US863225A US3608523DA US3608523A US 3608523 A US3608523 A US 3608523A US 863225 A US863225 A US 863225A US 3608523D A US3608523D A US 3608523DA US 3608523 A US3608523 A US 3608523A
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US
United States
Prior art keywords
web
tray
copy
liquid
solution
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
US863225A
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English (en)
Inventor
Lester H Jeffery
Edward J Radin
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.)
R Q O HOLDING CO Inc
Original Assignee
GAF 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 GAF Corp filed Critical GAF Corp
Application granted granted Critical
Publication of US3608523A publication Critical patent/US3608523A/en
Assigned to R Q O HOLDING COMPANY INC reassignment R Q O HOLDING COMPANY INC ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: GAF CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • G03G15/108—Apparatus for electrographic processes using a charge pattern for developing using a liquid developer with which the recording material is brought in contact, e.g. immersion or surface immersion development

Definitions

  • the web with the face up then enters the arcuate space between upper and lower trays containing liquid toner with the face up.
  • the underside of the upper tray is metallized to provide image intensification by the reinforced lines of force between such metal surface and the electrostatic latent image areas of the copy as web passes through the toner solution in close proximity to the upper tray
  • the latter is provided with a vertical wall adjacent the rear thereof, and with front wall having a row of rectangular openings through which the toner liquid cascades into the lower tray by first impinging upon the faceup copy of the web, causing the latter to be forced down and away from the underside of the upper tray, inhibiting undesirable copy surface imperfections.
  • the copy web is drawn upwardly from the arcuate space by squeegee rollers located above an elongated pan at the back of a toner reservoir for also receiving liquid overflow from the lower tray, through a horizontal row of recesses in the upper edge of rear wall of such tray.
  • the liquid is returned to the reservoir from such pan, and then pumped back into the J upper tray.
  • the main object of this invention is to provide a liquid toning system for wet electrostatic copiers which solves such problem, producing copies bearing no undesirable marks, or other copy surface imperfections.
  • Another object is to provide a novel and improved technique for performing the toning function in wet electrostatic office copiers.
  • a further object is to provide a wet electrostatic toning system that is efficient and effective in operation, simple in its parts, and easy to maintain in proper condition for satisfactory copying.
  • FIGURE is a fragmentary run mainly in perspective of wet electrostatic toning apparatus illustrative of the invention.
  • an elongated boxlike reservoir is provided for liquid toning solution 12.
  • the reservoir 10 comprises a relatively large from pan l4 and a somewhat smaller rear pan 16 located under a pair of front copy web drive and metering rollers 18 and 20, and a pair of rear.
  • a lower downwardly arcuate trough or tray 26 having-a horizontal row of slots 28 in therear edge thereof for the overflow of liquid from the tray into the rear from 16 thereby maintaining the surface 30 of such liquid at a desired. level.
  • a somewhat similarly shaped arcuate upper tray 32 Mounted on the reservoir 10 above the lower tray 26, is a somewhat similarly shaped arcuate upper tray 32.
  • a wall 34 separates the upper tray 32 into a larger front part 36 for containing a supply of the liquid toning solution, and a rear part 38 that is empty.
  • Liquid 10 is continuously supplied to the part 36 from reservoir 10 by a pump 37 and overflows through a horizontal row of rectangular openings 40 provided for such purpose in the front wall of the upper tray 32.
  • the underside 42 of the upper try 32 is either metallized plastic, or a metal member to provide image intensification, and is spaced from the lower tray 26 to provide a downwardly and upwardly curved space or path 44 for the copy paper web (not shown) which enters at the front and exits at the rear, as indicated by the heavy flow arrows 46 and 48.
  • the space 44 also contains the liquid toner solution which flows in the same direction during the operation of the system.
  • a prewetting solution is delivered from tray 14 to the spray tube 24 where it is sprayed directly upon the wirewound roller 18 therebelow.
  • Copy material (not shown) enters, face up, between the drive roller 20 and metering roller 18, is thereby prewetted, squeegeed, and then enters directly into toner path 44.
  • the wire-wound roller 18 provides an important function for the successful operation of the prewetting system.
  • the wire size is so selected as to provide a predetermined quantity of solution while at the same time uniformly distributing a liquid layer of the preconditioning solution over the entire sheet of the copy material. This liquid layer prevents background buildup that would be prevalent without such copy paper preconditioning.
  • the mechanism of this type of system appears to be related to an insulating layer being placed over the entire copy surface to reduce the residual charge level remaining in the background areas after exposure.
  • the relatively high background level (fog) on the copy is a result of the migration of the very small size toner particle adhering to the background areas carrying the residual charge.
  • the described system also allows the usage of highly concentrated (greater percentage-of'pigment to carrier) toner solution which results in excellent image fill, especially in the larger solid areas as compared .to most systems currently in use. Without this capability, copy contract would also be poor because of the high-speed short-path system used in the machine.
  • a further advantage is'the wide concentration range over which the copy quality remains very acceptable. The system is therefore insensitive to overconcentration as compared to most toning systems.
  • the underside surface 42 of the upper tray 32 is either a metallized plastic or a metal member which providesimage intensification.
  • the intensified fields provide means for producing well-filled image areas on the copy.
  • Toner solution 12 is pumped from reservoir 10 to part 36 upper tray 32. Solution then cascades through openings 40 and impinges upon faceup copy, causing same to be forced down and away from underside surface 42 of the upper tray 32. This produces a clean copy bearing no marks or other copy surface imperfections. Copy proceeds through andat bottom of the curved path 44 until exiting between squeegee rollers 22 and 22'.
  • Squeegeed toner solution is caught by rear pan l6, and returned to the toner reservoir 10.
  • Overflow slots 28 allow excess toner solution also to be returned via rear pan 16 to reservoir 10 after flowing through the curved path44 in the same direction as that of the web of copy paper.
  • Wet electrostatic toning apparatus for developing a moving web or sheet of sensitized latent image bearing copy material in a liquid developing solution, comprising:
  • a reservoir in the form of an elongated rectangular box is provided for a supply of liquid toner solution, which is located directly under said lower tray, and comprises a rear pair for receiving the overflow of excess liquid from the slots in the edge of the rear wall of such lower tray.
  • means for prewetting the web with such solution before such web enters such web path located above said front pan, so that excess prewetting liquid falls therein.
  • said web prewetting means comprises a pair of web drive rollers, one of which is wire wound; a liquid spray tube located above said wire-wound roller;
  • An electrostatic toning system for copy machines comprising:
  • a toner solution trough having an arcuately curved upper surface in substantially concentric spaced relationship to the underside surface of said tray;
  • said tray having a horizontal row of liquid overflow openings for delivering liquid toner solution from said tray to the leading side of the arcuate space between said tray and trough, for filling such space with the solution as the copy paper passes therethrough in the same direction as that of the solution;
  • said trough having a horizontal row of slots for the overflow of the liquid toner solution, located above the level of the liquid in said tray.
  • means for returning such overflow to a reservoir including a pan located under squeegee rolls for acting on the paper as it leaves such space.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Wet Developing In Electrophotography (AREA)
US863225A 1969-10-02 1969-10-02 Trostatic toning apparatus Expired - Lifetime US3608523A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US86322569A 1969-10-02 1969-10-02

Publications (1)

Publication Number Publication Date
US3608523A true US3608523A (en) 1971-09-28

Family

ID=25340617

Family Applications (1)

Application Number Title Priority Date Filing Date
US863225A Expired - Lifetime US3608523A (en) 1969-10-02 1969-10-02 Trostatic toning apparatus

Country Status (9)

Country Link
US (1) US3608523A (enrdf_load_stackoverflow)
BE (1) BE756955A (enrdf_load_stackoverflow)
CH (1) CH510282A (enrdf_load_stackoverflow)
DE (2) DE7036058U (enrdf_load_stackoverflow)
FR (1) FR2068265A5 (enrdf_load_stackoverflow)
GB (1) GB1289569A (enrdf_load_stackoverflow)
NL (1) NL7014422A (enrdf_load_stackoverflow)
SE (1) SE360189B (enrdf_load_stackoverflow)
ZA (1) ZA706683B (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243491A (en) * 1962-10-01 1966-03-29 Us Rubber Co Methods of making foam products
US3929099A (en) * 1974-09-05 1975-12-30 Gaf Corp Toner apparatus for electrophotographic development
US4270856A (en) * 1978-05-23 1981-06-02 Applied Copy Technology, Inc. Conversion kit for photocopying machine
US4623241A (en) * 1981-11-18 1986-11-18 Nashua Corporation Developing apparatus and method for a photocopier employing liquid development

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4025938A (en) * 1974-05-17 1977-05-24 Sharp Kabushiki Kaisha Liquid developer reservoir for copying machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649758A (en) * 1950-12-05 1953-08-25 Us Rubber Co Coating machine with circulating system
US3112685A (en) * 1961-06-12 1963-12-03 Ralph D Bennett Image transfer apparatus
US3249088A (en) * 1963-04-03 1966-05-03 Scm Corp Developing tank unit for electrostatic printing

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2649758A (en) * 1950-12-05 1953-08-25 Us Rubber Co Coating machine with circulating system
US3112685A (en) * 1961-06-12 1963-12-03 Ralph D Bennett Image transfer apparatus
US3249088A (en) * 1963-04-03 1966-05-03 Scm Corp Developing tank unit for electrostatic printing

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3243491A (en) * 1962-10-01 1966-03-29 Us Rubber Co Methods of making foam products
US3929099A (en) * 1974-09-05 1975-12-30 Gaf Corp Toner apparatus for electrophotographic development
US4270856A (en) * 1978-05-23 1981-06-02 Applied Copy Technology, Inc. Conversion kit for photocopying machine
US4623241A (en) * 1981-11-18 1986-11-18 Nashua Corporation Developing apparatus and method for a photocopier employing liquid development

Also Published As

Publication number Publication date
NL7014422A (enrdf_load_stackoverflow) 1971-04-06
DE7036058U (de) 1971-01-28
GB1289569A (enrdf_load_stackoverflow) 1972-09-20
FR2068265A5 (enrdf_load_stackoverflow) 1971-08-20
SE360189B (enrdf_load_stackoverflow) 1973-09-17
DE2047894A1 (de) 1971-04-08
ZA706683B (en) 1971-07-28
BE756955A (fr) 1971-03-16
CH510282A (de) 1971-07-15

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Legal Events

Date Code Title Description
AS Assignment

Owner name: R Q O HOLDING COMPANY INC, NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:GAF CORPORATION;REEL/FRAME:004006/0585

Effective date: 19820526

Owner name: R Q O HOLDING COMPANY INC 111 WEST 2ND ST JAMESTOW

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:GAF CORPORATION;REEL/FRAME:004006/0585

Effective date: 19820526