Serial dot printer device

Details Serial dot printer device Serial dot printer device

1993-09-28

1995-10-17

Yan, Ren

Typewriting machines

Control of print position along print-line by signal...

400323, B41J 2375, B41J 1930

Patent

active

054584248

ABSTRACT:
A serial printer for preventing the coil of a print head from being burned, by detecting the temperature of the print head to switch the printing mode of the print mode from a bidirectional mode to a split mode in accordance with the detected temperature. This serial printer comprises: a print head bidirectionally movable for printing line by line according to print data; temperature detecting means for detecting the temperature of the print head; print data density discriminating means for discriminating whether the print data of one line of the print data inputted have high density or low density; and print control means for switching the printing mode of the print head from a bidirectional printing mode to a split mode, in which one line is printed separately by at least two times, when it is determined that the print data of the one line is of high density and that the detected value of the temperature detecting means exceeds a predetermined value. The coil of the print head is prevented from being burned, without using any thermal conducting agent, so that a sufficiently high effective printing speed can be achieved.

REFERENCES:
patent: 4540295 (1985-09-01), Okunishi et al.
patent: 4653940 (1987-03-01), Katsukawa
patent: 5152619 (1992-10-01), Niikawa et al.

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