Thermal printer that detects rate of temperature increase

Details Thermal printer that detects rate of temperature increase Thermal printer that detects rate of temperature increase

1989-06-12

1991-10-22

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Thermal

400 54, B41J 2375

Patent

active

050590448

ABSTRACT:
A ticket issuing device includes a thermal head, a temperature detector circuit for detecting the temperature of the thermal head, and a printing control circuit for driving the thermal head to repeatedly print boarding ticket information on paper a number of times, corresponding to the number of tickets to be issued, and issuing the printed paper as tickets. In the ticket issuing device, the printing control circuit derives a temperature difference between the temperatures detected by the temperature detector circuit before and after each printing operation, and uses the result as the rate of temperature increase of the thermal head, temporarily sets the thermal head into a non-active state for a period of time corresponding to a difference between the rate of the temperature rise and a reference value set to be higher than the rate of the temperature rise which will be attained in the course of the printing operation at normal printing density, when it is detected that the rate of temperature increase has exceeded the reference value and then starts the printing operation.

REFERENCES:
patent: 3777116 (1973-12-01), Brescia et al.
patent: 4376942 (1983-03-01), Toth
patent: 4540295 (1985-09-01), Okunishi
patent: 4651166 (1987-03-01), Katsuragi
patent: 4778293 (1988-10-01), Teshima

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