Patent
1991-07-31
1993-08-10
Rutledge, D.
G03D 1300
Patent
active
052353702
ABSTRACT:
A temperature control system (10) of an automatic film processor (12) includes developer and fixer recirculation paths (30, 40) having thermowell heaters (34, 44) and thermistors (35, 45), and a cooling loop (37) in the developer path (30) which passes in heat exchange relationship with water in a wash tank (23). The system (10) also has a blower (48), heater (49) and thermistor (52) in an air path of a dryer (24). Actual heating and cooling rates of heating and cooling cycles are determined based on temperature measurements by the thermistors (35, 45, 52). Heater (34, 44, 49) and cooling loop (37) malfunctions are identified by comparing actual rates with rates characteristic of normal operations. Periodic readings of a precision resistor (89) are made to check for failures in analog-to-digital (87), multiplexing (86) and thermistor (35, 45, 52) circuits. An error-responsive fresh film inhibit feature, with user selectable override, is provided.
REFERENCES:
patent: 4057817 (1977-11-01), Korb et al.
patent: 4182567 (1980-01-01), Laar et al.
patent: 4300828 (1981-11-01), Kaufmann
patent: 4994837 (1981-02-01), Samuels et al.
patent: 5065173 (1991-11-01), Samuels et al.
Kenneth W. Oemcke, "Ambient Water Thermal Control System," Dept. of Mechanical Engineering, Rochester, N.Y., Jul. 1978.
Newman Michael
Samuels James T.
Eastman Kodak Company
Franz Warren Locke
Rutledge D.
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