US3735199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Supply device for an outlet nozzle in an ink jet writing method
Assignee: Paillard SA
•
Filing: 1971-12-21
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Granted: 1973-05-22
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Expires: 1991-12-21
Abstract
Abstract A convex ink meniscus is obtained at the outlet of the nozzle by hydrostatic pressure created by a pump situated between the ink reservoir and the nozzle. The ink jet is obtained by an electric field. The pump is of the continuous type, means being provided to reduce the operational pressure at the level of the nozzle from the value necessary to create a convex meniscus to a value for which the ink remains substantially contained inside the nozzle. A control device acts on these means to render them inoperative and ensures the re-establishment of the meniscusforming pressure at the beginning of each period of writing. The pump may have a member having a surface of revolution in which a spiral passage is hollowed, a second member with a second surface of revolution is applied against the first and movable by electromagnetic means.
Inventors
- 👤 E Ascoli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:20
CPC Classifications
F; F04; F04D; F04D15/00; F04D15/0027; F04D15/0033; B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/015; B41J2/02; B41J2/035; B41J2/17; B41J2/175; B41J2/17596; F04D1/00; F04D1/02; F04D29/00; F04D29/18; F04D29/20; F04D3/00; F04D3/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
Device for supplying ink from a reservoir to an outlet nozzle for an ink jet writing method in which a convex ink meniscus is formed at The outlet of a nozzle by hydrostatic pressure generated by a pump situated between the reservoir and the outlet nozzle, the ink jet being formed by an electric field, said device comprising: a pump of continuous type; pressure-reducing means to reduce the operational pressure at the level of the nozzle from the value necessary to create a convex meniscus to a value for which the ink remains substantially contained within the nozzle; and a control device arranged to act on said pressure-reducing means to render them inoperative and to ensure the re-establishment of the meniscus-forming pressure at the beginning of each period of writing.
Claim 2
Dependent Claim
130 words
Device for supplying ink from a reservoir to an outlet nozzle for an ink jet writing method in which a convex ink meniscus is formed at The outlet of a nozzle by hydrostatic pressure generated by a pump situated between the reservoir and the outlet nozzle, the ink jet being formed by an electric field, said device comprising: a pump of continuous type; pressure-reducing means to reduce the operational pressure at the level of the nozzle from the value necessary to create a convex meniscus to a value for which the ink remains substantially contained within the nozzle; and a control device arranged to act on said pressure-reducing means to render them inoperative and to ensure the re-establishment of the meniscus-forming pressure at the beginning of each period of writing.
Claim 3
Dependent Claim
38 words
Device according to claim 1, wherein the pressure-reducing means comprise a by-pass connecting the pump outlet to the pump input, and a valve, governed by electrical circuits controlling the writing, arranged to close or open respectively said by-pass.
Claim 4
Dependent Claim
33 words
Device according to claim 2, including a spring to urge said valve into closed position against the effect of the outlet pressure from the pump, to form a valve for adjusting said pressure.
Claim 5
Dependent Claim
45 words
Device according to claim 3, including a rod arranged to lift said valve from its seat, a second spring acting on said rod, and an electromagnet acting to urge said rod against the effect of the second spring to enable the closing of the valve.
Claim 6
Dependent Claim
161 words
Device according to claim 1, wherein the pump comprises: a first member bounded on one of its surfaces by a first surface revolution, said surface forming a passage having the general form of a spiral, at least approximately centered on the axis of this surface revolution, the passage being open over at least a portion of its length on this first surface; a second member bounded on one of its surfaces by a concentric second surface of revolution and of shape identical with the first surface, a chamber filled by fluid to be placed under pressure in which chamber, said two surfaces are situated, one of the two members being rotatable with respect to the second member around the common axis of the two surfaces of revolution; and displacement means enabling the axial movement of one said member with respect to the other so as to apply said two surfaces of revolution against one another against the effect of the fluid-pressure.
Claim 7
Dependent Claim
12 words
Device according to claim 5, wherein said displacement means are magnetic means.
Claim 8
Dependent Claim
38 words
Device according to claim 6, wherein the member driven in rotation is axially movable and formed at least in part of magnetic material, a fixed electromagnetic winding being provided to produce the axial movement of the rotatable member.
Claim 9
Dependent Claim
13 words
Device according to claim 7, wherein the winding is situated outside said chamber.
Claim 10
Dependent Claim
16 words
Device according to claim 5, wherein it is the rotatable member which has said spiral-form passage.
References Cited (Backward Citations)
US3458760A
Cited
US3458762A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |