US4180334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dot printer
Assignee: Oki Electric Industry Co Ltd
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Filing: 1978-07-13
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Granted: 1979-12-25
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Expires: 1998-07-13
Abstract
Abstract The present invention discloses herewith a new and novel dot printer for printing characters or the like by a dot matrix, wherein print timing is automatically corrected in relationship to the spacing speed of printing elements so that uneven dot distance is eliminated.
Inventors
- 👤 Akinori Watanabe
- 👤 Katsumasa Shinozuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 00:30
CPC Classifications
B; B41; B41J; B41J2/00; B41J2/22; B41J2/23; B41J9/00; B41J9/44; B41J9/46
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
120 words
For a dot matrix type printer comprising a print head with print elements for accomplishing print functions by depositing dots in columns selectively as the print head moves across a paper on which printing is effected, an improvement comprising a control system for controlling the timing for said print elements to deposit successive columns of ink dots, said control system comprising means to measure the time of travel of said print elements between successive columns of dots to form a measured time, means to store predetermined corrective time amounts corresponding to respective columns of ink dots, means to combine said measured time and a respective one of said corrective amounts for controlling the time of activation of said print elements.
Claim 2
Dependent Claim
120 words
For a dot matrix type printer comprising a print head with print elements for accomplishing print functions by depositing dots in columns selectively as the print head moves across a paper on which printing is effected, an improvement comprising a control system for controlling the timing for said print elements to deposit successive columns of ink dots, said control system comprising means to measure the time of travel of said print elements between successive columns of dots to form a measured time, means to store predetermined corrective time amounts corresponding to respective columns of ink dots, means to combine said measured time and a respective one of said corrective amounts for controlling the time of activation of said print elements.
Claim 3
Dependent Claim
22 words
An apparatus as claimed in claim 1, wherein said means to combine said measured time and said corrective amounts comprises adder means.
Claim 4
Dependent Claim
30 words
An apparatus as claimed in claim 2, further comprising timing signal generator means for generating a timing signal each time that a column of dots is deposited on said paper.
Claim 5
Dependent Claim
73 words
An apparatus as claimed in claim 3, wherein said timing signal generator means comprises a slit disk rotatable with the movement of said print head, said slit disk being provided with spaced apart radial slits through which light can pass, said slits providing timing signals for said timing signal generator means corresponding to the spacing between successive dot columns and the time of movement of said print head between said successive dot columns.
Claim 6
Dependent Claim
67 words
An apparatus as claimed in claim 1, wherein said means to combine comprises an adder, said means to store comprises an addressable memory with the contents of the locations in memory containing respective different corrective time amounts stored in binary form, said means to measure said time of travel comprising a binary counter, said adder adding the contents of said binary counter to said corrective time amount.
Claim 7
Dependent Claim
36 words
An apparatus as claimed in claim 5, further comprising clock pulse means connected to said binary counter, said clock pulse means causing said counter to count during the time between the printing of successive dot columns.
Claim 8
Dependent Claim
15 words
An apparatus as claimed in claim 5, wherein said addressable memory comprises a read only-memory.
Claim 9
Dependent Claim
39 words
An apparatus as claimed in claim 1, wherein said means to store comprises an addressable memory with the contents of the locations in memory containing respective different corrective time amounts, and means to address said memory comprising counter means.
Claim 10
Dependent Claim
35 words
An apparatus as claimed in claim 8, wherein said counter means of said means to address said memory is incremented by one for each dot column location as said print head moves across the paper.
References Cited (Backward Citations)
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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) | 1982-12-24 | 1983-06-25 | 1983-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-24 | 1987-06-25 | 1987-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-24 | 1991-06-25 | 1991-12-25 | $7700.00 | Window Closed / Lapsed |