Photography – Fluid-treating apparatus – Having testing – calibration – or indicating
Patent
1997-06-25
1998-09-01
Mathews, A. A.
Photography
Fluid-treating apparatus
Having testing, calibration, or indicating
396626, 396630, 396631, G03D 306
Patent
active
058024166
ABSTRACT:
Described herein is a countercurrent multi-tank washing stage (10) for photographic processing apparatus which comprises a first washing tank (500), a last washing tank (100) and at least one intermediate washing tank (200, 300, 400), each washing tank having a recirculation system (102, 202, 302, 402, 502) associated therewith. The first washing tank (500) is positioned upstream from the last washing tank (100). Each of the last washing tank (100) and the intermediate washing tanks (200, 300, 400) is fluidly connected to the recirculation system of an adjacent upstream washing tank (200, 300, 400, 500). Level sensors (112, 114, 212, 214, 312, 314, 412, 414, 512) are provided in each of the washing tanks (100, 200, 300, 400, 500) to control an operating level (116, 216, 316, 416, 516) of washing solution in each of the tanks (100, 200, 300, 400, 500) and a fill level (118, 218, 318, 418) in the last and intermediate tanks (100, 200, 300, 400). Fresh washing solution is added to the last washing tank (100) in response to signals from the level sensors (112, 212, 312, 412, 512) when the operating level falls below the level. Sensors (114, 214, 314, 414) at the fill level (118, 218, 318, 418) are used to control the transfer of solution from the last washing tank (100) via the recirculation systems (102, 202, 302, 402) to the tank(s) where the operating level has fallen. Sensors (110, 210, 310, 410, 510) are also provided in the recirculation systems (102, 202, 302, 402, 502) for sensing the conductivity of the washing solution and hence controlling the filling of the tanks (100, 200, 300, 400, 500) in response to conductivity values over a predetermined limit.
REFERENCES:
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patent: 4451132 (1984-05-01), Kishimoto
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patent: 5307107 (1994-04-01), Nozawa et al.
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Earle Anthony
Wells Leslie
Eastman Kodak Company
Mathews A. A.
Novais David A.
Pincelli Frank
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