Thermal dot type printing apparatus

Details Thermal dot type printing apparatus Thermal dot type printing apparatus

1985-03-15

1986-10-14

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Thermal

346 76PH, 400 54, B41J 312, B41J 320

Patent

active

046169415

ABSTRACT:
A thermal dot type printing apparatus includes a thermal head having N heating elements arranged in a line, a head driver which allows a current to selectively flow through the heating elements in accordance with N-bit dot data, and a control circuit for sequentially supplying a plurality of N-bit dot data constituting the character data to be printed to the head driver. This printing apparatus further has a counter for counting the total number of heating elements energized by the head driver in a unit time. The control circuit supplies a control signal in accordance with a count data of the counter to the head driver, thereby reducing the current which is supplied to the heating elements upon printing operation.

REFERENCES:
patent: 4284876 (1981-08-01), Ishibashi
patent: 4409599 (1983-10-01), Yasuda
patent: 4415904 (1983-11-01), Inui
patent: 4415907 (1983-11-01), Suemori
patent: 4456392 (1984-06-01), Nozaki
patent: 4464669 (1984-08-01), Sekiya
patent: 4524368 (1985-06-01), Inui
patent: 4536774 (1985-08-01), Inui

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