Patent US1822324A successfully refreshed from Google Patents.
Patent US3998153A successfully refreshed from Google Patents.
US3998153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency power integrating printer
Assignee: Unisys Corp
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Filing: 1975-03-18
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Granted: 1976-12-21
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Expires: 1995-03-18
Abstract
Abstract In order to reduce the noise resulting from the act of printing in a typewriter or line printer, the hammer is oscillated at high frequency with low power pulses, and the oscillating hammer is moved into proximity to the inked ribbon whereby the hammer repetitively impacts the ribbon in order to print one character.
Inventors
- 👤 Heinrich S. Erhardt
- 👤 Mosi Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:06
CPC Classifications
B; B41; B41J; B41J9/00; B41J9/26; B41J9/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
161 words
In a printer mechanism of the type having a hammer that is actuated to impact a paper and inking substrate between a print member and said hammer, the improvement comprising: a stationary support; a hammer carriage mounted on and supported by said stationary support and moveable between a first position and a second position on said stationary support, said hammer being mounted on said carriage and moveable relative thereto; means linked to said carriage for moving said carriage between said first position whereat said hammer cannot impact said paper when moved relative to said carriage and said second position whereat said hammer impacts said paper and inking substrate between said hammer and said print member each time said hammer is impulsed; and, hammer impulsing means separate from said means for moving said carriage, said hammer impulsing means mounted on said carriage and being linked to said hammer for repetitively impulsing said hammer each time said carrige is at said second position.
Claim 2
Dependent Claim
161 words
In a printer mechanism of the type having a hammer that is actuated to impact a paper and inking substrate between a print member and said hammer, the improvement comprising: a stationary support; a hammer carriage mounted on and supported by said stationary support and moveable between a first position and a second position on said stationary support, said hammer being mounted on said carriage and moveable relative thereto; means linked to said carriage for moving said carriage between said first position whereat said hammer cannot impact said paper when moved relative to said carriage and said second position whereat said hammer impacts said paper and inking substrate between said hammer and said print member each time said hammer is impulsed; and, hammer impulsing means separate from said means for moving said carriage, said hammer impulsing means mounted on said carriage and being linked to said hammer for repetitively impulsing said hammer each time said carrige is at said second position.
Claim 3
Dependent Claim
46 words
A printer mechanism as claimed in claim 1 wherein the means repetitively impulsing said hammer comprises means operative on each print cycle for producing a plurality of power pulses, each said pulse being at approximately the threshold level required to separate ink from said inking substrate.
Claim 4
Dependent Claim
17 words
A printer mechanism as claimed in claim 1 wherein said print member is a moveable character matrix.
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) | 1979-12-21 | 1980-06-21 | 1980-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-21 | 1984-06-21 | 1984-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-21 | 1988-06-21 | 1988-12-21 | $7700.00 | Window Closed / Lapsed |