Automatic processor

Details Automatic processor Automatic processor

1985-01-22

1987-06-02

Mathews, A. A.

Fluid handling

Flow affected by fluid contact, energy field or coanda effect

Means to regulate or vary operation of device

354299, 354320, 354324, 137550, G03B 302

Patent

active

046698477

ABSTRACT:
An automatic photographic processor having a filter provided in a circulating flow path of the processing liquid used in a developing tank. A control device calculates the total quantity of light-sensitive material processed by the liquid since the filter was last changed. The control device generates a warning signal when the total quantity reaches a predetermined value. An accoustical or optical warning device responsive to the warning signal indicates that the filter should be changed. A flowrate meter or pressure detection system in the circulating flow path checks the effectiveness of the filter and can also generate a warning signal for the warning device to indicate that the filter should be changed.

REFERENCES:
patent: 1062236 (1913-05-01), Hitchcock
patent: 1438983 (1922-12-01), Collin
patent: 2880753 (1959-04-01), Wilkins
patent: 2936780 (1960-05-01), Pratt
patent: 3115154 (1963-12-01), Dillon
patent: 4182567 (1980-01-01), Laar et al.

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