Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device
Patent
1981-11-27
1983-01-04
Perkey, William B.
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to regulate or vary operation of device
354324, 13762415, 250559, G03D 302, G03D 1300
Patent
active
043670296
ABSTRACT:
A method and apparatus for automatically controlling an activity of a developing liquid for use in a developer are disclosed. A blackening area rate detector detects a blackening area rate of a film developed and outputs an analog signal to a voltage-frequency converter which converts it into a digital signal. The digital signal is sent to a dividing counter which frequency-divides it and outputs a supplement signal to an up-down counter. The up-down counter is counted up by the supplement signal to output a high level signal to a timer via a gate. The timer is actuated by the high level signal to actuate a valve so as to supply a supplemental developing liquid to a developing tank. The gate is closed by using the output signal of the timer during the actuation of the timer. The up-down counter is counted down by the high level signal passed through the gate.
REFERENCES:
patent: 4104670 (1978-08-01), Charnley et al.
patent: 4128325 (1975-12-01), Melander et al.
Dainippon Screen Seizo Kabushiki Kaisha
Perkey William B.
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