Patent number: 5510872
Abstract: The level of chemical treatment baths is automatically, compensated, in film developing machines. A vessel (90) contains a supply of water which is directed by a pump (50) and a pipeline (51) through a manifold (7) to baths (11, 12, 13, 14, 15) by way of feed pipelines (71, 72, 73, 74, 75). Each pipeline is controlled by respective solenoid valve (61, 62, 63, 64, 65) controlled to operate simultaneously with the pump (50) by way of an electronic control unit (41) in receipt of signals relayed from sensors (21, 22, 23, 24, 25) designed to detect a drop in the level of the solutions in the baths (11, 12, 13, 14, 15). The feed outlets of the pipelines (71, 72, 73, 74 75) discharge above the level of the baths (11, 12, 13, 14, 15) so as to prevent any possibility of reflux.
Type:
Grant
Filed:
June 9, 1994
Date of Patent:
April 23, 1996
Assignee:
San Marco Imaging S.r.l.
Inventors:
Giosue Franci, Ennio Pessot, Daniele Bravin, Danny Lant, Dragan Raus