High speed thermal printer

Details High speed thermal printer High speed thermal printer

1993-06-09

1995-03-21

Tran, Huan H.

Incremental printing of symbolic information

Thermal marking apparatus or processes

Gradational recording

346134, 346136, 400120, B41J 2325, B41J 1142, B41J 1136

Patent

active

054000599

ABSTRACT:
A high speed thermal printer including a maximum data detector for detecting maximum gradation data from the image signal of a line received from a signal input source on a line-by-line basis, a drum motor for transporting printing paper, a reel motor for transporting film containing printing dye, and a servo controller for controlling a printing speed by varying the speed of the drum motor and the reel motor in accordance with the detected maximum data value. The printer has the advantages of the drum motor and reel motor being driven at a constant speed for the duration of the maximum gradation printing, and the dye being expressed uniformly throughout the printing line. Thus, high quality printing can be achieved and the printing time decreased by the motors being driven at a constant speed to the following printing position after the maximum gradation of a line has been printed.

REFERENCES:
patent: 4990930 (1991-02-01), Ludden et al.
patent: 5257098 (1993-10-01), Lee

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