Photography – Fluid-treating apparatus – Heating – cooling – or temperature detecting
Patent
1995-08-30
1997-07-15
Rutledge, D.
Photography
Fluid-treating apparatus
Heating, cooling, or temperature detecting
396572, 396626, G03D 1300
Patent
active
056492618
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to an apparatus for treating photographic originals with a treatment liquid. Particularly, the invention is directed to an apparatus for developing an exposed proof provided with a visible light absorbing composition, particularly with color particles, the apparatus being of the type used, e.g., in the color proofing systems in the print industry. Particularly, in connection with the present invention, the term "photographic original" is meant to include photographic films and metal or plastic printing plates. In connection with the invention, the treating of such originals primarily comprises fixing and developing processes. Thus, the treatment liquid can particularly be a fixing and developing liquid.
Developer apparatus are normally provided with a transport means for transporting the proof to be developed through the apparatus and guiding it past various units. The first unit having the exposed proof guided therealong is a developer liquid dispenser unit which is mostly provided as a spray tube with an application roll. The developer liquid partially dissolves or disperses the color particle layer to detach color particles in those regions of the proof which previously have been exposed in the exposure device, as is the case in methods for positive printing. In methods for negative printing, the situation is exactly reverse thereto. The detached color particles are removed from the proof by a take-off device. Normally, this take-off device is provided as a rotating brush having the proof guided along it. In addition to the brush, water is supplied to the proof for washing off color particles. Excess water is wiped off by use of squeezing rolls or the like. Subsequently, the proof in dried in a drying means by preheated air prior to leaving the developer apparatus.
Known developer apparatus for color proofing systems are provided with a tempering device for tempering the developer liquid. For obtaining proofs of high quality, it is usually required that the developer liquid supplied to the developer liquid dispenser unit has a temperature within a predetermined range of temperatures (generally 23.degree. C.-26.degree. C.). For obtaining multi-colored proofs, the above described developing process is performed for each of the primary colors of the proof. Usually, multi-colored proofs are composed of the three colors a) red, blue and yellow or b) cyan, magenta, and yellow, and black in addition. Thus, the development of such a proof is carried out in four developing processes, which are interrupted by the laminating of the corresponding color particles and the exposure of the proofs provided with the color particles. This means that, when generating a multi-color proof, only phase-wise use is made of the developer apparatus each time. For the quality of the multi-colored proof, it is important that the developer liquid is kept at nearly an identical temperature during all development processes for a proof. In this regard, the absolute value of the temperature of the developer liquid is less important as long as the temperature is in the above defined range. Known developer apparatus are equipped with a temperature sensor or the like for detecting the temperature of the developer liquid. A control unit connected to the temperature sensor will then control the tempering device correspondingly for maintaining the developer liquid at a substantially constant temperature.
In known developer apparatus for color proofing systems, the heating of the developer liquid is performed by electrical heater elements or the like, whereas the cooling of the developer liquid is performed by heat exchanger systems using a cooling agent (water in most cases). Therefore, known developer apparatus need separate connections for supply or discharge of the cooling liquid. Thus, the location of known developer apparatus has to meet certain demands, i.e. a water supply conduit and a water discharge conduit must be available in the immediate vicinity for connection to the coolant circuit of the developer app
REFERENCES:
patent: 3212274 (1965-10-01), Eidus
patent: 3230723 (1966-01-01), Korn
patent: 4350429 (1982-09-01), Slavin
patent: 5027145 (1991-06-01), Samuels
patent: 5059996 (1991-10-01), Bailey et al.
Mento Giovanni
Moebius Heinz-Guenter
Schlickhoff Reiner
Minnesota Mining and Manufacturing Company
Rutledge D.
Weimer William K.
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