US3708798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink distribution for non-impact printing recorder
Assignee: International Business Machines Corp
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Filing: 1971-12-23
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Granted: 1973-01-02
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Expires: 1991-12-23
Abstract
Abstract A collapsible ink bag supplies ink at constant pressure through a manifold containing an air bubble trap, capable of venting, which manifold is connected in common to plural lines to a multiple orifice - multiple transducer fluid wave printing head of a recorder. Constant static pressure in the ink supply is provided to avoid inadvertent ejection of ink through orifices of the nozzles. The manifold contains an air bubble and the manifold inlet line has a sufficiently low resistance to flow. Its source of ink supply is free to expand and contract, and the hydraulic resistance to fluid flow in the lines to the head is sufficiently high to eliminate cross talk of waves between separate orifices. Alternatively, a built in reservoir in the head has a single low resistance connection to the source of ink supply and high resistance lines connect it to the orifices.
Inventors
- 👤 W Hildenbrand
- 👤 K Stroms
- 👤 W Levine
- 👤 S Manning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:30
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/175
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
87 words
A multiple orifice, multiple transducer, fluid wave ink ejection recorder including a printing head with a plurality of tapered printing cavities, each of said cavities having an orifice at the smaller end and a diaphragm actuator at the opposite end, a reservoir of ink, said reservoir being connected to each of said orifices by a passageway having a small diameter and A high impedance to fluid waves, said reservoir including means for maintaining substantially constant fluid pressure in response to transmission of fluid waves through said passageways.
Claim 2
Dependent Claim
87 words
A multiple orifice, multiple transducer, fluid wave ink ejection recorder including a printing head with a plurality of tapered printing cavities, each of said cavities having an orifice at the smaller end and a diaphragm actuator at the opposite end, a reservoir of ink, said reservoir being connected to each of said orifices by a passageway having a small diameter and A high impedance to fluid waves, said reservoir including means for maintaining substantially constant fluid pressure in response to transmission of fluid waves through said passageways.
Claim 3
Dependent Claim
19 words
Apparatus in accordance with claim 1 wherein said reservoir is connected to a substantially constant pressure source of ink.
Claim 4
Dependent Claim
31 words
Apparatus in accordance with claim 1 wherein said means for maintaining substantially constant fluid pressure comprises a bubble chamber providing an air trap for absorbing pressure waves to reduce pressure fluctuations.
Claim 5
Dependent Claim
111 words
A multiple orifice, multiple transducer, fluid wave ink ejection recorder including a source of ink at a substantially constant pressure, a reservoir of ink connected to said source of ink and including an air chamber providing pneumatic pressure regulation, a writing head including a plurality of piezoelectric transducers secured to diaphragms, a plurality of tapered orifices having a said diaphragm at one end and at the opposite end having a nozzle for writing, said head including a plurality of high fluid-impedance passageways each connected at one end to one of said orifices and coupled at the opposite end to said reservoir whereby cross talk of waves between orifices is substantially eliminated.
Claim 6
Dependent Claim
111 words
A multiple orifice, multiple transducer, fluid wave ink ejection recorder including a source of ink at a substantially constant pressure, a reservoir of ink connected to said source of ink and including an air chamber providing pneumatic pressure regulation, a writing head including a plurality of piezoelectric transducers secured to diaphragms, a plurality of tapered orifices having a said diaphragm at one end and at the opposite end having a nozzle for writing, said head including a plurality of high fluid-impedance passageways each connected at one end to one of said orifices and coupled at the opposite end to said reservoir whereby cross talk of waves between orifices is substantially eliminated.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-02 | 1976-07-03 | 1977-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-02 | 1980-07-03 | 1981-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-02 | 1984-07-03 | 1985-01-02 | $7700.00 | Window Closed / Lapsed |