Electric heating – Heating devices – Combined with diverse-type art device
Patent
1983-03-18
1984-11-27
Albritton, C. L.
Electric heating
Heating devices
Combined with diverse-type art device
219388, 346 76R, 432 59, 432230, H05B 102
Patent
active
044852940
ABSTRACT:
Apparatus is provided for obtaining optimal development of photothermographic paper at different paper speeds and with intermittent paper movement. This is accomplished by a heater platen with plural heaters which are selectively energized in accordance with a function of paper speed. Also a fan for cooling of the platen is selectively energized in accordance with temperature. For this purpose, a temperature signal is produced corresponding to the temperature of each heater and, a speed signal is produced corresponding to the paper speed; if desired, a contrast signal can be produced corresponding to the degree of contrast desired in the development of the paper. A logic device, preferably a microprocessor operating under a program control, processes the signals and controls the energization of the heaters and the fan. More particularly, the platen is heated by plural electrical resistance heaters and is provided with a temperature sensor for each resistance heater. Energizigation of each heater is controlled by the microprocessor to apply voltage pulses at a controlled pulse rate in accordance with temperature. The fan includes an intake and discharge fan for cooling the platen. Energizigation of the fans is controlled by the microprocessor to provide a controlled pulse rate for speed control of the fans. The heater platen is of such construction that it has high thermal conductivity and low thermal inertia to permit fast temperature change.
REFERENCES:
patent: 3558853 (1971-01-01), Schluntz
patent: 3585917 (1968-03-01), Griffith
patent: 3588445 (1971-06-01), Hopkins
patent: 3745307 (1973-07-01), Peek
patent: 3813677 (1974-05-01), Shimotsuma
patent: 3934112 (1976-01-01), Lakhani
patent: 4275959 (1981-06-01), Jones
patent: 4354095 (1982-10-01), de Vries
Dyer, S., "Printing Energy Control for a Thermal Printer", IBM Tech. Disc. Bulletin, vol. 24 No. 7B Dec. 1981, p. 3973.
Albritton C. L.
Phoenix Medical Corporation
Walberg Teresa J.
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