Processor unit with provision for automated control of processing parameters
a processing unit and automatic control technology, applied in the field of processing imaged precursors, can solve the problems of weakening or contaminating the chemical solutions used, prior art processors equipped with such automatic functions do not integrate well with imaging and processing systems,
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example 1
Precursor Dimensions
[0032]Advantageously information specifying the dimensions of each precursor are transferred to the processor from the imaging device. While the processor may comprise a sensor which permits it to determine precursor length (e.g. from a sensor on the feed table and knowledge of the feed rate), width and thickness are more difficult to measure in a processor.
[0033]Most imaging devices require dimensional parameters to be retained for setting up the imaging process and / or handling the precursor. Specifically, an imaging device will need to know the length and width of a plate in order to load it correctly onto the imaging bed. Once it is loaded the imaging systems need to know where the media is placed on the imaging bed so that the image can be scanned onto the precursor in correct registration. These dimensions will either be supplied to the imaging device by the operator or determined by the device using a suitable measurement system. Thickness is also an import...
example 2
Precursor Type
[0036]While a processor is generally equipped to process a specific precursor type, a situation may exist where a printing plant has several imaging devices outputting precursors of similar but possibly slightly different compositions. As imaging media such as negative working thermal plates become more commonplace, it is also possible that their compositions and processing requirements will become more generic, possibly allowing plates of different composition to be passed through a common processor. By transferring a type identifier to processor 7 for or with each plate to be processed by processor 7, processor 7 can determine to process a specific plate differently from other plates. The amount of preheat applied, the feed rate, and other processor functions can be changed, enabled, or disabled to suit a particular precursor.
[0037]Furthermore, since for many printing precursors the performance and run length on press is at least partially determined by the processin...
example 3
Image Area and Image Constitution
[0038]Precursor area is easily determined by a prior art processor from measurement of length and width of the plate, but image area is very difficult to detect at a processor 7. Advantageously the imaging device can be equipped to determine a number of parameters related to image area that can assist in adjusting a processor for optimal operation. Specifically the actual imaged area is a more relevant parameter for determining developer replenishment needs than the simple surface area of a precursor. “Actual imaged area” means the sum of the areas of all image pixels on a precursor. Obviously, a page of simple text has an image area significantly different from that of a picture on a dark background. Depending on the precursor and processing method, either5 the image area or the non-image area is removed in the processing line. In cases where the developer section can be considered as acting essentially only on the part of the image that must be rem...
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