System for replenishing developer

Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device

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Details

354324, 137 93, G03D 1300

Patent

active

041981510

ABSTRACT:
Disclosed herewith is a developer replenishment system in an apparatus used in developing photographic films, the system comprises a first integrator to integrate a converted signal of an electric value corresponding to a light radiated from a light source after interfering in a developed film; a second integrator to integrate an electric signal being of a larger rising gradient than said converted signal; a first comparator designed to generate a signal for initiating replenishment of developer when it receives a prescribed electrical value signal and a signal from said first integrator and when the signal value from said integrator reaches the level of said prescribed electrical signal; a drive circuit designed to be driven by said signal for initiating replenishment of developer and to actuate a developer replenishment pump and cause said second integrator to start an operation; a second comparator designed to generate a signal for ceasing replenishment of developer when it receives the signal from said second integrator and the signal from said first integrator and when the former signal value becomes equal to the latter signal value; and a mono-multi circuit designed to be driven by the signal from said second comparator to generate a shot pulse, thereby to cause the operation of said first integrator to be ceased.

REFERENCES:
patent: 3561344 (1971-02-01), Frutiger
patent: 3787689 (1974-01-01), Fidelman
patent: 3870065 (1975-03-01), Minns, Jr.
patent: 3990088 (1976-11-01), Takita
patent: 4057818 (1977-11-01), Gaskell et al.

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