US4193703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix printer with piezoelectrically driven printing needles
Assignee: International Business Machines Corp
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Filing: 1978-01-11
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Granted: 1980-03-18
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Expires: 1998-01-11
Abstract
Abstract A matrix printer with piezoelectrically driven printing needles is described in which an electrically controlled piezocrystal arrangement transfers upon its expansion, its change of length to a buckling spring. Coupled to the buckling compression column spring is a printing needle which, upon the deflection of the buckling spring, is driven in the printing direction.
Inventors
- 👤 Walter Sakmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:20
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/235; B41J2/25; B41J2/26; B41J2/27; B41J2/295; H; H02; H02N; H02N2/00; H02N2/02; H02N2/04; H02N2/043
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
100 words
In a matrix printer having piezoelectrically driven printing elements, the improvements comprising: a buckling compression column spring; at least one piezoelectric crystal arrangement provided with electrical contacts for electrical control of the expansion of said crystal arrangement; means for coupling the expansion of said crystal arrangement to said spring along the line of the axis of said spring to create a buckling thereof; and a movable printing element supported adjacent to the central portion of said spring to be deflected therewith when said spring buckles; said buckling spring being arranged between two piezoelectric crystal arrangements acting at opposite ends thereof.
Claim 2
Dependent Claim
100 words
In a matrix printer having piezoelectrically driven printing elements, the improvements comprising: a buckling compression column spring; at least one piezoelectric crystal arrangement provided with electrical contacts for electrical control of the expansion of said crystal arrangement; means for coupling the expansion of said crystal arrangement to said spring along the line of the axis of said spring to create a buckling thereof; and a movable printing element supported adjacent to the central portion of said spring to be deflected therewith when said spring buckles; said buckling spring being arranged between two piezoelectric crystal arrangements acting at opposite ends thereof.
Claim 3
Dependent Claim
18 words
Apparatus as described in claim 1, further including: compression means for preloading said piezoelectric crystal arrangements in compression.
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) | 1983-03-18 | 1983-09-17 | 1984-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-18 | 1987-09-17 | 1988-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-18 | 1991-09-17 | 1992-03-18 | $7700.00 | Window Closed / Lapsed |