Mixing device comprising concentric tubes for supplying solutions onto and mixing on a rotor

A device for mixing photographic solutions, the device comprising:

• a body having an interior;
• a plurality of solutions for introducing into the interior of the body;
• mixing means in the interior of the body for mixing the solutions comprising at least one mixing surface which is arranged substantially perpendicular to the direction of flow of the solutions orifices wherein each mixing surface is formed on a rotor which is rotated;
• a rotor on which each of the at least one mixing surfaces is formed, the rotor being rotated about an axis by a motor;
• a disc element included on the rotor;
• a first mixing zone provided on the disc element, said mixing zone being substantially annular and being centered about the axis of the rotor, at which mixing zone at least two of the solutions impinge for mixing;
• at least one further mixing zone provided on the disc element, the at least one further mixing zone being substantially annular and being located radially outwardly of the first mixing zone and substantially concentric therewith;
• at least one annular element having steps, said at least one annular element being included on the rotor and arranged to be substantially perpendicular to the disc element;
• a further mixing zone corresponding to the step of the at least one annular element for mixing the solutions;
• a plurality of inlets connected to the interior of the body and through which solutions to be mixed are introduced;
• a plurality of concentric orifices connected to respective ones of said inlets, the concentric orifices directing the solutions to be mixed onto the mixing means providing a plurality of mixing zones;
• an outlet connecting the interior of the body to the exterior thereof and through which the mixed solutions can be removed from the device;
• characterized in that each of the concentric orifices terminates at a respective one of the mixing zones.