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US3608523A Expired / Lapsed US ⏱️ 0.0 years remaining

Trostatic toning apparatus

Assignee: GAF Corp
•
Filing: 1969-10-02
•
Granted: 1971-09-28
•
Expires: 1989-10-02
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Abstract

Abstract LIQUID TONING SOLUTION IS SPRAYED ON A WIRE WOUND ROLLER TO PREWET A SHEET OR WEB OF COPY MATERIAL AS THE LATTER IS FED DOWNWARDLY BETWEEN SUCH ROLLER AND A DRIVE ROLLER TO SQUEEGEE SUCH WEB OR SHEET. 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 UPPER TRAY.

Inventors

  • 👤 Lester H Jeffery
  • 👤 Edward J Radin

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 18:44
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/108

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 61 words
The invention as defined by claim 1, wherein 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.
Claim 2
Dependent Claim 43 words
The invention as defined by claim 2, wherein said reservoir also includes a front pan; and 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.
Claim 3
Dependent Claim 47 words
The invention as defined by claim 3, wherein 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; and means for pumping liquid solution from said reservoir to said spray tube.
Claim 4
Dependent Claim 39 words
The invention as defined by claim 4, wherein a pair of web drive rolls are located above the outlet of such web path, which squeegee such web above said rear tray, whereby excess liquid falls into such rear tray.
Claim 5
Dependent Claim 72 words
The invention as defined by claim 5, wherein the direction of flow of liquid toner solution in the web path is the same as that of such web, and the web passes through such solution in close proximity to the metal surface on the underside of the upper tray, generating reinforced lines of force between the image areas of the copy and such metal surface, thereby producing well-filled images on such copy.
Claim 6
Dependent Claim 58 words
The invention as defined by claim 1, wherein the liquid toner solution cascading through the front wall openings of the lower tray, impinges upon the faceup copy, causing such copy to be forced down and away from the underside metal surface of such tray, resulting in a clean copy bearing no undesirable marks or other copy surface imperfections.
Claim 7
Dependent Claim 152 words
An electrostatic toning system for copy machines, comprising: a wire-wound metering roller; a spray tube for spraying prewetting solution directly on said roller; a squeegee roller cooperating with said wire-wound roller; an upper tray having an electrically charged metallized arcuately curved underside surface facing the copy paper which passes thereunder; and 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.
Claim 8
Dependent Claim 45 words
The invention as defined by claim 8, wherein a common liquid toner solution reservoir is located under said trough; and 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.

References Cited (Backward Citations)

US2649758A Cited
US3112685A Cited
US3249088A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1974-09-27 1975-03-29 1975-09-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1978-09-27 1979-03-29 1979-09-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1982-09-27 1983-03-29 1983-09-28 $7700.00 Window Closed / Lapsed

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