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AssigneeDüRr Dental SE
InventorsMathias Muller, Gerhard Schmidtchen
Estimating the term…
Small apparatus for developing photosensitive materials, in particular table-top apparatus, comprises a housing divided by partitions into a plurality of processing stations, for example a developing station, a fixing station and a washing station. Each of the stations comprises a trough containing the respective processing liquid. The photosensitive material to be developed is conveyed by transport rolls from an inlet, through the successive stations and out of an outlet. Liquid in a trough is circulated by a device comprising a magnetic rotor which rotates in a submerged rotor housing in the trough and has inlet openings in its cover and a tangential outlet opening in its periphery. The rotor is rotated by a rotating magnetic field arrangement outside the trough. In one embodiment it comprises a motor-driven permanent magnet. In another, it comprises magnetic coils arranged in a circle and energized sequentially.
Apparatus for developing photosensitive material, comprising an apparatus housing with a plurality of processing stations each comprising walls defining a trough adapted to be filled with liquid to a predetermined level, transport means for transporting said photosensitive material successively through the liquids in said troughs, and means for circulating liquid in a trough, said circulating means comprising a circular rotor housing mounted on a wall of said trough below the upper surface of liquid in said trough, said rotor housing having a peripheral wall and a cover with at least one inlet opening in said cover and an outlet opening in said peripheral wall, a rotor rotatable in said rotor housing about an axis perpendicular to said wall, said rotor comprising magnetic material, and driving means outside said wall for producing a magnetic field rotating about said axis and penetrating said wall to act on said magnetic material to drive said rotor in rotation about said axis and thereby draw liquid from said trough in said inlet opening and discharge liquid into said trough from said outlet opening.
Apparatus for developing photosensitive material, comprising an apparatus housing with a plurality of processing stations each comprising walls defining a trough adapted to be filled with liquid to a predetermined level, transport means for transporting said photosensitive material successively through the liquids in said circulating means comprising a rotor rotatable in said trough below the liquid level about an axis perpendicular to said wall of said trough, said rotor comprising magnetic material, driving means outside said wall for producing a magnetic field rotating about said axis and penetrating said wall to act on said magnetic material to drive said rotor in rotating about said axis, said driving means comprising a removable plug-in unit and said housing having a receptacle for receiving said plug-in unit in position to drive said rotor.
Apparatus for developing photosensitive material, comprising an apparatus housing with a plurality of processing stations each comprising walls defining a trough adapted to be filled with liquid to a predetermined level, transport means for transporting said photosensitive material successively through the liquids in said troughs, and means for circulating liquid in a trough, said circulating means comprising a rotor rotatable in said trough below the liquid level about an axis perpendicular to said wall of said trough, said rotor comprising magnetic material, driving means outside said wall for producing a magnetic field rotating about said axis and penetrating said wall to act on said magnetic material to drive said rotor in rotating about said axis, said driving means comprising a plurality of electromagnets arranged in a circle concentric with said axis and having a diameter approximately equal to that of said rotor and means for energizing said electromagnets sequentially to produce a rotating magnetic field.
Dependencies are inferred from the claim text.