Patent US4681470A successfully refreshed from Google Patents.
US4681470A
Expired / Lapsed
US
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Bidirectional serial printer
Assignee: Ricoh Co Ltd
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Filing: 1983-12-30
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Granted: 1987-07-21
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Expires: 2003-12-30
Abstract
Abstract A printer once stores input data in a buffer memory and then sequentially reads them out for printing. Whether the input data is predetermined one is determined and, based on the result, the sequence of input data stored in the buffer memory is changed. Even in an auto-back mode of operation, the printer prevents a host system associated therewith from erroneously detecting a printer error to stop a job thereof.
Inventors
- 👤 Yoshinori Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:41
CPC Classifications
B; B41; B41J; B41J1/00; B41J1/22; B41J1/24; B41J5/00; B41J5/30; B41J5/44; B41J5/46; G; G06; G06K; G06K15/00; G06K15/02; G06K15/10; G06K2215/00; G06K2215/0002; G06K2215/002; G06K2215/0082; G06K2215/0085
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A printer in which input data are once stored in predetermined addresses of a buffer memory and then sequentially read therefrom to be printed out on a sheet, comprising: data discriminator means for determining whether the input data is predetermined data; and data sequence changing means for changing a sequence of the input data stored in the buffer memory such that an order of the input data is reversed in response to a result of the determination by said data discriminator means; the carriage return code discriminator circuit being constructed to reproduce a back signal if not producing the back signal when the input data is the carriage return data and, if producing, stop delivery of the back signal and deliver a back mode signal.
Claim 2
Dependent Claim
125 words
A printer in which input data are once stored in predetermined addresses of a buffer memory and then sequentially read therefrom to be printed out on a sheet, comprising: data discriminator means for determining whether the input data is predetermined data; and data sequence changing means for changing a sequence of the input data stored in the buffer memory such that an order of the input data is reversed in response to a result of the determination by said data discriminator means; the carriage return code discriminator circuit being constructed to reproduce a back signal if not producing the back signal when the input data is the carriage return data and, if producing, stop delivery of the back signal and deliver a back mode signal.
Claim 3
Dependent Claim
52 words
A printer as claimed in claim 1, in which the data sequence changing means comprises a start-of-back address memory which, when supplied with the back signal from the carriage return code discriminator circuit, generates a start address which is produced by incrementing an input address input to the buffer memory by one.
Claim 4
Dependent Claim
46 words
A printer as claimed in claim 2, further comprising an end-of-back address memory which, when the back signal supplied from the carriage return code discriminator circuit disappears, generates an end address which is produced by decrementing the input address input to the buffer memory by one.
Claim 5
Dependent Claim
78 words
A printer as claimed in claim 3, in which the data sequence changing means further comprises a sequence control circuit which reads the start address from the start-of-back address memory and produces an increment signal for incrementing the start address, reads the end address from the end-of-back address memory and produces a decrement signal for decrementing the end address, and produces a strobe signal, an input address and an output address which are supplied to the buffer memory.
Claim 6
Dependent Claim
55 words
A printer as claimed in claim 4, in which the data sequence changing means further comprises a memory which is supplied with data output from the buffer memory and supplies said data to the buffer memory, the sequence control circuit being constructed to produce control signals for writing data and reading data from said memory.
Claim 7
Dependent Claim
63 words
A printer as claimed in claim 5, in which the data sequence changing means further comprises a coincidence and reversal discriminator circuit for producing a mode end signal when the start address output from the start-of-back address memory and the end address output from the end-of-back address memory coincide with each other and when the start address becomes larger than the end address.
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) | 1990-07-20 | 1991-01-19 | 1991-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-20 | 1995-01-19 | 1995-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-20 | 1999-01-19 | 1999-07-21 | $7700.00 | Window Closed / Lapsed |