Communications: electrical – Digital comparator systems
Patent
1973-12-26
1977-04-26
Morrison, Malcolm A.
Communications: electrical
Digital comparator systems
178 23R, G06F 312, H04L 1524
Patent
active
040204650
ABSTRACT:
A thermal line printer includes a semiconductor chip for control of A .times. N heaters arrayed in N groups past which thermally sensitive paper is stepped B times in printing a line of characters in an A .times. B dot matrix. A sequential access memory stores N multibit words, one word for each character to be printed on a given line with a commutator cyclically to read words from the memory A .times. B times for each line to be printed. A ROM has an A .times. B dot matrix code therein for each available character. A time sequencer and decoder connected to the ROM is synchronized with the commutator to produce a different one bit output from the ROM each time each given word is read from memory. A set of N enable circuits leads from the ROM to N groups of heaters. A set of A enable circuits leads from the sequencer to A groups of heaters where one heater in each A group is from one of the N groups. A decoder interfaces the sequencer to the A groups of heaters and to the motor sequentially to enable the heaters in one A group for each memory cycle and in order through the A columns and B rows of the matrix.
REFERENCES:
patent: 3354817 (1967-11-01), Sakurai et al.
patent: 3476877 (1969-11-01), Perkins et al.
patent: 3634828 (1972-01-01), Myers et al.
Cochran Michael J.
Hamilton Stephen P.
Berg Richard P.
Grossman Rene E.
Krass Errol A.
Levine Harold
Morrison Malcolm A.
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