Method for controlling temperature of heat generating element of

Details Method for controlling temperature of heat generating element of Method for controlling temperature of heat generating element of

1983-03-07

1985-01-29

Envall, Jr., Roy N.

Electric heating

Heating devices

Combined with diverse-type art device

400120, 346 76PH, B41J 320

Patent

active

044968248

ABSTRACT:
A method and circuit for controlling the temperature of heat generating elements of a thermal transfer type thermal printing head is presented. The temperature of the thermal printing head is compared with preset low and high temperatures, within this range a normal thermal printing is effected. When the printer head temperature is high above the high preset temperature, a blower is energized in order to air-cool the printer head surface. When the printer head temperature goes lower than the preset low temperature, then the printing head is lifted up apart from the platen and thereafter all of the heat generating elements are heated up. The latter heating operation can be carried out prior to the start of the thermal transfer operation or during the thermal transfer operation by intermittently halting the operation.

REFERENCES:
patent: 3840878 (1974-10-01), Houston
patent: 3929215 (1975-12-01), Hayakawa
patent: 4376942 (1983-03-01), Toth
Nakaya, S., "New Thermal Ink-Transfer Printing", Proceedings of the SID, vol. 23/1, 1982, pp. 51-55.

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