US4971464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dot serial printer
Assignee: Hitachi Ltd
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Filing: 1990-02-27
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Granted: 1990-11-20
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Expires: 2010-02-27
Abstract
Abstract In a dot serial printer suitable for bidirectional printing of enlarged letters and the like, a signal for starting printing is produced with a time delay of m/n times the dot drive period relative to a signal produced in synchronism with a motor control timing in advance of commencement of printing to thereby promote print quality of the enlarged letters and the like.
Inventors
- 👤 Naoki Shikanai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:46
CPC Classifications
G; G06; G06K; G06K15/00; G06K15/02; G06K15/10; B; B41; B41J; B41J2/00; B41J2/485; B41J2/505; B41J2/5056
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
126 words
A dot serial printer for bidirectional printing of letters and the like comprising: first means for producing motor control timing pulse signals for controlling a carriage motor; second means for producing a signal indicative of printing in synchronism with the motor control timing pulse signals; third means for delaying the signals indicative of commencement of printing by m/n times a dot drive period, where m and n are positive integers and n > m so as to produce a delayed signal; and fourth means for producing dot control timing pulse signals in response to the delayed signal independently of the motor control timing pulse signals, a period of the dot control timing pulse signals being independent of a period of the motor control timing pulse signals.
Claim 2
Dependent Claim
126 words
A dot serial printer for bidirectional printing of letters and the like comprising: first means for producing motor control timing pulse signals for controlling a carriage motor; second means for producing a signal indicative of printing in synchronism with the motor control timing pulse signals; third means for delaying the signals indicative of commencement of printing by m/n times a dot drive period, where m and n are positive integers and n > m so as to produce a delayed signal; and fourth means for producing dot control timing pulse signals in response to the delayed signal independently of the motor control timing pulse signals, a period of the dot control timing pulse signals being independent of a period of the motor control timing pulse signals.
Claim 3
Dependent Claim
19 words
A dot serial printer according to claim 1, further comprising fifth means for making the value of m/n variable.
References Cited (Backward Citations)
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JPS5722059A
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JPS588681A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-19 | 1994-05-21 | 1994-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-19 | 1998-05-21 | 1998-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-19 | 2002-05-21 | 2002-11-20 | $7700.00 | Window Closed / Lapsed |