High speed thermal printing apparatus

Details High speed thermal printing apparatus High speed thermal printing apparatus

1990-06-04

1991-02-05

Reynolds, Bruce A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76PH, 346134, 346136, 346138, 358298, 400120, G01D 903, G01D 1510, H04N 121, B41J 2325

Patent

active

049909304

ABSTRACT:
A continuous-tone thermal printer includes a transport mechanism for advancing a print medium past a thermal print head while continuous-tone image information is being printed, line-by-line, on the medium. To increase the rate at which thermal prints are produced, the printer includes asynchronous motor-control apparatus for selectively accelerating the movement of the print medium relative to the print head to quickly locate the print head at the start of a new image line immediately following the printing of that pixel(s) having the highest image density in the preceding image line. Preferably, such motor-control apparatus includes a digital signal processor which determines the maximum pixel density on each line. Upon printing such maximum pixel density, the digital signal processor causes a motor controller to temporarily increase the print medium velocity past the thermal print head to the start of the next image line.

REFERENCES:
patent: Re33260 (1990-07-01), Stephenson
patent: 4710781 (1987-12-01), Stephenson
patent: 4745413 (1988-05-01), Brownstein et al.
patent: 4800399 (1989-01-01), Long et al.
patent: 4804975 (1989-02-01), Yip
patent: 4804977 (1989-02-01), Long
patent: 4837586 (1989-06-01), Brownstein

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