US3685897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectrophoretic apparatus using pyramid gears
Assignee: Xerox Corp
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Filing: 1970-10-28
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Granted: 1972-08-22
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Expires: 1990-10-28
Abstract
Abstract A photoelectrophoretic machine employs a flat transparent plate electrode on which images are made from a photoelectrophoretic ink exposed to electromagnetic radiation projected to the ink through the transparent plate and subjected to electric fields established between the plate and roller electrodes supported for travel over the plate. The rollers are journeled in first and second carriages that travel over the plate along different paths. The carriages are supported on pinion gears mated with rack gears on the four sides of the plate and intersecting one another. Pyramid gears are used at the intersections to enable the pinion gears on one rack to cross over an intersecting rack.
Inventors
- 👤 Robert L Culligan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:23
CPC Classifications
G; G03; G03G; G03G17/00; G03G17/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
In a photoelectrophoretic imaging system of the type wherein images are formed from photoelectrophoretic ink spread over a transparent plate by exposing the ink to activating electromagnetic radiation and subjecting the ink to electric fields established between the plate and roller electrodes supported to travel over the plate, the improvement comprising drive apparatus for said rollers including a first carriage in which at least one of said roller electrodes is journeled for rotation, said carriage being supported for travel over said plate by pinion gears mated with first and second rack gears positioned on opposite sides of said plate, a second carriage in which at least one of said roller electrodes is journeled for rotation, said carriage being supported for travel over said plate by pinion gears mated with third and forth rack gears positioned on opposite sides of said plate and intersecting said first and second rack gears, and pyramid gears at the intersections of said rack gears for permitting the pinion gears on a rack gear to cross over an intersecting rack gear.
Claim 2
Dependent Claim
175 words
In a photoelectrophoretic imaging system of the type wherein images are formed from photoelectrophoretic ink spread over a transparent plate by exposing the ink to activating electromagnetic radiation and subjecting the ink to electric fields established between the plate and roller electrodes supported to travel over the plate, the improvement comprising drive apparatus for said rollers including a first carriage in which at least one of said roller electrodes is journeled for rotation, said carriage being supported for travel over said plate by pinion gears mated with first and second rack gears positioned on opposite sides of said plate, a second carriage in which at least one of said roller electrodes is journeled for rotation, said carriage being supported for travel over said plate by pinion gears mated with third and forth rack gears positioned on opposite sides of said plate and intersecting said first and second rack gears, and pyramid gears at the intersections of said rack gears for permitting the pinion gears on a rack gear to cross over an intersecting rack gear.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein said rack gears intersect at angles of about 90* .
Claim 4
Dependent Claim
38 words
The apparatus of claim 1 wherein said pyramid gear includes teeth similar to the teeth of one intersecting rack gear having portions of said teeth removed to mate with the pinion gear traveling on the intersecting rack gear.
Claim 5
Dependent Claim
46 words
The apparatus of claim 1 wherein said pyramid gear comprises pyramid teeth having square bases, heights equal to the height of the taller teeth of the intersecting rack gears and peak-to-peak spacing about equal to the peak-to-peak spacing of the teeth on the intersecting rack gears.
Claim 6
Dependent Claim
26 words
The apparatus of claim 1 wherein said rack gears include teeth having triangular cross-sections, a finite height and a finite length and a constant peak-to-peak spacing.
Claim 7
Dependent Claim
24 words
The apparatus of claim 5 wherein the height, length and peak-to-peak spacing of the teeth on all the rack gears are substantially the same.
Claim 8
Dependent Claim
35 words
The apparatus of claim 5 wherein said pyramid gears include pyramid shaped teeth aligned parallel to the teeth of the intersecting racks in numbers proportional to the length of the teeth on the intersecting racks.
Claim 9
Dependent Claim
17 words
The apparatus of claim 7 wherein the peak-to-peak spacing of the intersecting rack gears are substantially equal.
References Cited (Backward Citations)
US2453656A
Cited
US3462219A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |