US4741636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dot drive circuit of wire dot type printer
Assignee: Oki Electric Industry Co Ltd
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Filing: 1986-11-07
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Granted: 1988-05-03
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Expires: 2006-11-07
Abstract
Abstract A dot drive circuit for a wire dot type printer including dot pins of a print head different in gaps with respect to a platen sets dot drive time intervals for each dot pin or for each dot pin group in accordance with the size of the gap.
Inventors
- 👤 Yoshinori Takahashi
- 👤 Kohtaroh Yoshimura
- 👤 Takeo Fujii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:14
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J2/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
135 words
A dot drive circuit for a wire dot printer adapted to permit respective dot pins of a print head to have different gaps to a platen, said dot drive circuit comprising: a microprocessor for outputting a dot drive timing signal and a first selection signals; means for setting different dot drive time intervals of said respective dot pins for each dot pin or for each group of dot pins in accordance with the sizes of said gap and for outputting drive pulses having different widths corresponding to the drive time intervals; gate circuits for receiving said drive pulses; magnets for printing corresponding to said selection signals and having a current to be conducted therethrough only during the time of the drive pulses being output as said microprocessor outputs said selection signals to said gate circuits.
Claim 2
Dependent Claim
135 words
A dot drive circuit for a wire dot printer adapted to permit respective dot pins of a print head to have different gaps to a platen, said dot drive circuit comprising: a microprocessor for outputting a dot drive timing signal and a first selection signals; means for setting different dot drive time intervals of said respective dot pins for each dot pin or for each group of dot pins in accordance with the sizes of said gap and for outputting drive pulses having different widths corresponding to the drive time intervals; gate circuits for receiving said drive pulses; magnets for printing corresponding to said selection signals and having a current to be conducted therethrough only during the time of the drive pulses being output as said microprocessor outputs said selection signals to said gate circuits.
Claim 3
Dependent Claim
26 words
A dot drive circuit of a wire dot pinter according to claim 1, wherein said means for setting a dot drive time interval comprises monostable multivibrators.
Claim 4
Dependent Claim
49 words
A dot drive circuit of a wire dot printer according to claim 1, wherein said dot drive time intervals are respectively a first prescribed time interval for upper and lower dot pins, and a second prescribed time interval for dot pins which located between said upper and lower pins.
Claim 5
Dependent Claim
34 words
A dot drive circuit of a wire dot printer according to claim 3, wherein there are two upper and lower dot pins and there are dot pins located between said upper and lower pins.
References Cited (Backward Citations)
JPS597065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |