Method of controlling thermal head

Details Method of controlling thermal head Method of controlling thermal head

1988-09-08

1990-03-27

Reynolds, Bruce A.

Recorders

Performance of multiple functions of steam and gas engines

Pressure responsive element

346 76PH, 400120, G01D 900

Patent

active

049124846

ABSTRACT:
A method of controlling the scanning of the thermal head to insure uniform printing density. The method comprises scanning thermal sensitive paper with the thermal head in a first direction while supplying the printing signal to the thermal head to thereby effect desired printing, terminating the printing signal after the completion of the printing while continuing the scanning of the paper in the first direction until heat accumulated in the thermal head has dissipated, and thereafter returning the thermal head while in contact with the thermal sensitive paper in a second direction opposite to the first direction. In the alternative, the thermal head can be disengaged from the thermal sensitive paper after the completion of printing a single line until heat accumulated in the thermal head has dissipated, and subsequently returning the thermal head while in contact with the thermal sensitive paper in the second direction. In this manner, the printing density can be maintained at a uniform level.

REFERENCES:
patent: 4595936 (1986-06-01), Nakajima et al.

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