Control system for high speed printer
US3938641A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 7, 1975 |
| Grant date | Feb 17, 1976 |
| Priority date | — |
| Expiry date | May 7, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K15/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An all-electronic control system for a high-speed column sequential dot matrix printer, using a permutation code signal of given pulse rate p comprising a series of individual code words each including a fixed number of data pulses preceded by a start pulse; the control system comprises a plural-stage FIFO storage register with a capacity of at least three, and preferably four or more, code words, for storing input data, as during a carriage return of the printer. A print timing oscillator having a frequency f is coupled to countdown means that develops a normal print rate signal f/n and a fast print rate signal f/m, where f >>p and n>m. A print rate selector selects one of the print rate signals, to control the printing speed of the printer, depending on whether a code word is stored in a given stage of the storage register.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.