Temperature control system

Details Temperature control system Temperature control system

1983-04-21

1985-02-26

Goldberg, E. A.

Recorders

Thermal recording

219216, 400120, G01D 1516

Patent

active

045020566

ABSTRACT:
This invention provides a temperature control system for a thermal printer which prints by urging a printing plate with type formed thereon against a heat-transfer paper sheet. The system raises the temperature of the printing plate rapidly after power is turned on and then maintains the temperature of the printing plate essentially constant at the optimal temperature, so that clear printing may be performed at any time. In the initial heating period of the printing plate, a high voltage is applied to the printing plate to raise the temperature quickly. When a first sensor detects that the printing plate has reached a temperature close to the optimal printing temperature, the high voltage supply is interrupted. Thereafter, a second sensor and a control circuit connected thereto serve to produce a low voltage that is applied so as to maintain the printing plate at the optimal printing temperature. The magnitude of the low voltage is inversely proportional to printing plate temperature.

REFERENCES:
patent: 4262188 (1981-04-01), Beach
patent: 4324486 (1982-04-01), Nishikawa

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