Fluid handling – Flow affected by fluid contact – energy field or coanda effect – Means to regulate or vary operation of device
Patent
1982-12-23
1983-12-20
Mathews, A. A.
Fluid handling
Flow affected by fluid contact, energy field or coanda effect
Means to regulate or vary operation of device
354324, 137563, G03B 306
Patent
active
044213999
ABSTRACT:
An arrangement for developing film has a developing chamber which is provided with an inlet and an outlet for the developer. The chamber is located above a first container having an open upper end and arranged to receive developer discharged through the outlet of the chamber. This container is located inside of or above a second container arranged to receive developer which overflows from the first container. The containers have respective outlets which merge into a single conduit leading to the developing chamber. A heating device surrounds the conduit or is accommodated in the first container and functions to heat the developer to a predetermined temperature required for development. A pump for circulating the developer is arranged in the conduit which leads to the developing chamber. The outlet of the second container is provided with a valve which is controlled by a thermal sensor. The total quantity of the developer greatly exceeds that which is actually required and the bulk of the developer is initially accommodated by the second container. Only sufficient developer to fill the developing chamber and to maintain circulation from the latter through the first container and the conduit back to the developing chamber is not received by the second container. The pump and the heating device are activated while the thermal sensor maintains the valve in its closed position. Thus, only the small portion of the developer which is not accommodated by the second container is circulated and subjected to the action of the heating device. Accordingly, this portion of the developer is heated to the developing temperature very rapidly thereby permitting the developing operation to begin shortly after the arrangement is activated. Once the developing temperature has been reached, the thermal sensor opens the valve to progressively mix the cool developer from the second container with the circulating hot developer. Such mixing may be enhanced by overflow from the first container to the second container.
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patent: 4349267 (1982-09-01), Ohtani
Agfa-Gevaert Aktiengesellschaft
Mathews A. A.
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