Dürr Dental Gmbh & Co. Kg

Mathias Muller

Gerhard Schmidtchen

Apparatus for adjusting the temperature of a plurality of liquids which includes temperature adjusting means having a corresponding plurality of separate flow paths, a pump arrangement for circulating the liquids through said separate paths and means for maintaining predetermined temperature differences between the liquids, wherein the temperature adjusting means includes a single temperature controlling member and a number of pipes which correspond in number to the number of separate flow paths for the liquids of which the temperatures are to be adjusted. The temperature controlling member and the pipes are interconnected in heat conducting so that the total thermal impedance between the first of said pipes and the temperature controlling member integrated from the inlet end to the outlet end of said first pipe differs from the corresponding total thermal impedance of at least a second of said pipes. The first of said pipes is located directly in heat conducting manner on the temperature controlling member and said at least second of said pipes is carried by said first of said pipes in a heat conducting manner. The thermal impedance defined between said at least second of the pipes and the temperature controlling member being thus formed by said first of the pipes.

Electric heating apparatus for regulating the temperature of a plurality

A process of cleaning the film transport rolls of developing apparatus having a transport system comprising a plurality of pairs of rolls for transporting the film from an inlet through successive aqueous baths and a drying section and out of a discharge, some of the rolls being above and others below the liquid level in the baths comprises passing lengthwise through the transport system of the apparatus a rectangular sheet of fleece material having fibers oriented parallel to one another and to the longitudinal edges of the sheet. The fibers are made of a material which is substantially free of swelling by the action of the baths of the developing apparatus. However, the liquid of the baths is absorbed in the interstices between the fibers of the fleece material so that as the cleaning material passes along the transport system it moistens those rolls which are above the liquid level and may have dried out. Any soluble impurities on such rolls are thereby dissolved. Any insoluble impurities on rolls above or below the liquid level are passed into the interstices between the fibers of the fleece material and are carried away by the material.

Process for cleaning transport rolls of film developing apparatus

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.

Growing community of inventors

Oberstenfeld, Germany

Mathias Muller