Boots – shoes – and leggings
Patent
1990-08-17
1992-07-07
Lall, Parshotam S.
Boots, shoes, and leggings
101211, G01J 346
Patent
active
051288796
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a method and to an apparatus for acquiring covering data of print areas for controlling what are referred to as color zone screws at offset printing presses.
The quantity of ink delivered to the individual printing cylinders that are in turn subdivided into zones can be set at offset printing presses on the basis of what are referred to as color zone control screws (zone screws).
In currently standard methods, the partial area coverage of a printing page is estimated, the zone screws of the color values are correspondingly pre-set and the zone screws are regulated to the correct ink quantity during the beginning of printing by alternating adjustment and repeated evaluation of the printed pages. In modern offset printing presses, this ink delivery can be automatically controlled from a central reservoir in accord with a program. To that end, coverage values that were calculated before the beginning of printing can also be input. These data are then calculated by rough scanning of exposed film negatives with what are referred to as color density measuring instrument, for example, Printamat-Scanner of Siemens, and are conducted to the control system via an interface.
A separate scanning of the exposed film negatives is required in this method, this producing a separate work step, i.e. an additional scanning device is required and a relatively imprecise calculation of the setting data is established by the type of rough scanning.
It is therefore the object of the invention to acquire the setting data for the zone screws simpler and more precisely and to offer them for the printing machine.
In the line-by-line recording of films for producing offset printing forms or in the line-by-line exposure of offset printing plates, the invention achieves this in that the setting values for the individual zone screws are directly calculated from the density values from the recording data, i.e. the density values of the line, and are stored or, respectively, are forwarded directly to the printing machine. Before the forwarding of the setting values to the printing machine, density values are advantageously converted into the setting values with masks that, with reference to printing area, printing surface in the pages and with reference to the register of the printing machine as well as with reference to the characteristic data of a page, contain the allocation of the setting values of the zone screws calculated from the density values in the page. These masks can preferably be produced with a personal computer, the setting values can be intermediately stored or can be directly forwarded to the zone controller of the printing machine via an interface. Further developments of the invention are recited in patent claims 1-7.
The method of the invention is advantageously employed in, for example, what are referred to as pressfax equipment wherein a newspaper page or color separations are scanned with flatbed scanners, are transmitted to some other location and are recorded line-by-line with flatbed recorders as film, offset or as color separations. Such equipment are described, for example, in the brochure, "Pressfaxsystem-Uebertragung von Druckvorlagen, of Dr.-Ing. Rudolf Hell GmbH, Kiel, Germany, Order No. 28294 (2d-H-8802).
The invention shall be set forth in greater detail below with reference to FIGS. 1-6. Shown are:
FIG. 1 a schematic diagram of a system for the transmission of printer's copies;
FIG. 2 a schematic structure of a flatbed scanner;
FIG. 3 a schematic structure of a flatbed recorder;
FIG. 4 a means for acquiring covering data of printing areas in combination with a printing machine;
FIG. 5 a schematic illustration of the dissection of a printed page into line segments; and
FIG. 6 a graphic illustration of the masks for the printing area and for the zones.
FIG. 1 shows a system for the transmission of complete newspaper pages from one location (transmission location) to another (reception location), whereby what are referred to as scan data are acquired with a scanner 1 that serve
REFERENCES:
patent: 4180741 (1979-12-01), Palmatier et al.
patent: 4441819 (1984-04-01), Takeuchi et al.
patent: 4494875 (1985-01-01), Schramm et al.
patent: 4512662 (1985-04-01), Tobias
patent: 4573798 (1986-03-01), Fujie et al.
patent: 4660159 (1987-04-01), Ott
patent: 4665496 (1987-05-01), Ott
Greve Helmut
Lindemann Eckhard
Schmidt-Stoelting Claus
Dr. -Ing. Rudolf Hell GmbH
Lall Parshotam S.
Melnick S. A.
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