US4466005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air bubble removing system in a printer head of an ink jet system printer of the ink on demand type
Assignee: Sharp Corp
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Filing: 1982-07-22
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Granted: 1984-08-14
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Expires: 2002-07-22
Abstract
Abstract An air bubble removing system is provided in an ink jet system printer of the ink on demand type for removing air bubbles contained in a pressure chamber of a printer head of the ink jet system printer. The air bubble removing system applies a driving signal of various frequencies and having various voltage levels to a piezoelectric transducer attached to the pressure chamber, thereby discharging the air bubbles contained in the ink liquid disposed in the pressure chamber through an orifice provided at one end of the pressure chamber.
Inventors
- 👤 Hisashi Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:38
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/005; B41J2/01; B41J2/17; B41J2/19
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
170 words
In an ink jet system printer of the ink on demand type which includes a printer head comprising a pressure chamber of which one end is provided with an orifice means for emitting ink droplets therethrough, and the other end is connected to an electro-mechanical transducer for suddenly reducing the volume of said pressure chamber, the improvement comprising: an air bubble removing system for applying a preselected driving signal to said electro-mechanical transducer so as to discharge air bubbles contained in ink liquid disposed in said pressure chamber through said orifice means including a first control means for applying a driving signal of a first preselected voltage level and having at least two different frequencies in a predetermined cycle to said electro-mechanical transducer; a second control means for applying a driving signal of a second preselected voltage level and having at least two different frequencies in a predetermined cycle to said electro-mechanical transducer; and a third control means for energizing said first control means and, then, said second control means.
Claim 2
Dependent Claim
170 words
In an ink jet system printer of the ink on demand type which includes a printer head comprising a pressure chamber of which one end is provided with an orifice means for emitting ink droplets therethrough, and the other end is connected to an electro-mechanical transducer for suddenly reducing the volume of said pressure chamber, the improvement comprising: an air bubble removing system for applying a preselected driving signal to said electro-mechanical transducer so as to discharge air bubbles contained in ink liquid disposed in said pressure chamber through said orifice means including a first control means for applying a driving signal of a first preselected voltage level and having at least two different frequencies in a predetermined cycle to said electro-mechanical transducer; a second control means for applying a driving signal of a second preselected voltage level and having at least two different frequencies in a predetermined cycle to said electro-mechanical transducer; and a third control means for energizing said first control means and, then, said second control means.
Claim 3
Dependent Claim
28 words
The ink jet system printer of the ink on demand type of claim 1, wherein said first preselected voltage level is higher than said second preselected voltage level.
Claim 4
Dependent Claim
35 words
The ink jet system printer of the ink on demand type of claim 2, wherein said first preselected voltage level is 300 V p-p and said second preselected voltage level is 100 V p-p .
Claim 5
Dependent Claim
62 words
The ink jet system printer of the ink on demand type of claim 1, 2 or 3, wherein said predetermined cycle includes: a first period wherein the frequency of said driving signal is 1 KHz; a second period wherein the frequency of said driving signal is 125 Hz; and a third period wherein the frequency of said driving signal is 4 Hz.
Claim 6
Dependent Claim
22 words
The ink jet system printer of the ink on demand type of claim 4, wherein one cycle is completed in two seconds.
Claim 7
Dependent Claim
36 words
The ink jet system printer of the ink on demand type of claim 5, wherein said control means functions to repeat said first cycle four times and subsequently functions to repeat said second cycle four times.
Claim 8
Dependent Claim
40 words
The ink jet system printer of the ink on demand type of claim 5, wherein said first control means functions to repeat said cycle by four times, and said second control means functions to repeat said cycle by four times.
Claim 9
Dependent Claim
145 words
In an ink jet system printer of the ink on demand type which includes a printer head comprising a pressure chamber of which one end is provided with an orifice means for emitting ink droplets therethrough, and the other end is connected to an electro-mechanical transducer for suddenly reducing the volume of said pressure chamber, the improvement comprising: an air bubble removing system for applying a preselected driving signal to said electro-mechanical transducer so as to discharge air bubbles contained in ink liquid disposed in said pressure chamber through said orifice means including control means for applying a first driving signal of a first voltage level and having at least two different frequencies in a first predetermined cycle and subsequently, a second driving signal of a second voltage level and having at least two different frequencies in a second predetermined cycle to said electro-mechanical transducer.
Claim 10
Dependent Claim
145 words
In an ink jet system printer of the ink on demand type which includes a printer head comprising a pressure chamber of which one end is provided with an orifice means for emitting ink droplets therethrough, and the other end is connected to an electro-mechanical transducer for suddenly reducing the volume of said pressure chamber, the improvement comprising: an air bubble removing system for applying a preselected driving signal to said electro-mechanical transducer so as to discharge air bubbles contained in ink liquid disposed in said pressure chamber through said orifice means including control means for applying a first driving signal of a first voltage level and having at least two different frequencies in a first predetermined cycle and subsequently, a second driving signal of a second voltage level and having at least two different frequencies in a second predetermined cycle to said electro-mechanical transducer.
Claim 11
Dependent Claim
26 words
The ink jet system printer of the ink on demand type of claim 8, wherein said first voltage level is higher than said second voltage level.
Claim 12
Dependent Claim
32 words
The ink jet system printer of the ink on demand type of claim 9, wherein said first voltage level is 300 V p-p and second voltage level is 100 V p-p .
Claim 13
Dependent Claim
62 words
The ink jet system printer of the ink on demand type of claim 8, 9, or 10, wherein said predetermined cycle includes: a first period wherein the frequency of said driving signal is 1 KHz; a second period wherein the frequency of said driving signal is 125 Hz; and a third period wherein the frequency of said driving signal is 4 Hz.
Claim 14
Dependent Claim
23 words
The ink jet system printer of the ink on demand type of claim 11, wherein each said cycle is completed in two seconds.
References Cited (Backward Citations)
US4245224A
Cited
US4323908A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-08-14 | 1988-02-13 | 1988-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-14 | 1992-02-13 | 1992-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-14 | 1996-02-13 | 1996-08-14 | $7700.00 | Window Closed / Lapsed |