Printing – Multicolor – Rotary machines
Reexamination Certificate
1999-03-26
2001-09-04
Asher, Kimberly L. (Department: 2854)
Printing
Multicolor
Rotary machines
C101S230000
Reexamination Certificate
active
06283025
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates generally to printing machines, and more particularly to a sheet-fed rotary printing machine for multicolor printing.
BACKGROUND OF THE INVENTION
It is a known practice in the printing of small-format printing sheets to use printing units in which the cylinders participating in the printing, such as a plate cylinder, a rubber or blanket cylinder and a printing cylinder, have different diameters. Through the use of cylinders of different diameters it is possible to save material costs with regard to the printing plates, the rubber blankets or the printing cylinder.
A sheet-fed rotary printing machine is disclosed in DE-PS 24 35 203. This printing machine includes in its most diverse configurations plate cylinders with a single or simple diameter, a rubber cylinder with a multiple diameter and a printing cylinder with a single diameter. With this arrangement, a partial portion of a print image can be printed on one of several segments of the rubber cylinder from differently installable printing units of a particular plate cylinder. Simultaneously, this print image can be printed on a printing sheet led on the printing cylinder. In such a system, the printing sheet revolves with the printing cylinder in correspondence to the movement of the segments of the rubber cylinder and is thereby printed.
In U.S. Pat. No. 3,347,160 there is described an ink roller device for a multicolor rotary offset printing machine. The printing machine disclosed in this reference includes a plate cylinder and a rubber cylinder, each having a multiple diameter, to which there is allocated a printing cylinder having a single or simple diameter. In the printing operation, the print image consists of several image parts that are generated on the plate cylinder of several cycled inking and moistening units, the image parts are transferred to the large, multiple-sized rubber cylinder and printed on a printing sheet guided on the printing cylinder. The printing cylinder revolves multiple times in correspondence to the diameter ratio between the rubber cylinder and the printing cylinder, until all of the print image parts are transferred to the printing sheet. This multicolor printing machine is particularly suited for so-called proof printing. The problem with these devices is that while they can be arranged as individual printing units, the costs associated with printing with images that contain more ink than permitted by the particular printing machine are very high. Accordingly, these printing machines are suited only for special printing processes.
OBJECTS AND SUMMARY OF THE INVENTION
An object of the invention is to provide a printing machine having a configuration that provides a simple construction and selectively combinable printing units for generating printing sheets with a differing number of colors.
An additional object of the invention is to provide a printing machine which eliminates the need to exchange aggregates or assemblies and is suited for high throughput with arbitrary edition levels.
A further object of the invention is to provide a printing machine of the foregoing type which utilizes standard elements so as to produce a simple, and thereby, cost efficient printing machine and whereby the elements can be used in different combinations so as to produce differently configured multicolor prints at an optimal performance level without having to re-outfit the printing machine.
The present invention provides these and other advantages and overcomes the drawbacks of the prior art by providing a sheet-fed printing machine for printing in one or more colors in which the plate cylinders are provided with two printing plates and the rubber cylinders have only a simple or single diameter. The present invention offers the particular advantage that as compared to standard printing machines, the printing machine configurations of the present invention are very simple and permit, with minimal expenditure, cost effective printing processes, in which consideration is given to a so-called “slim” or slender sheet running. Moreover, the costs for manufacturing the printing machine are reduced through the use of simple elements.
These and other features and advantages of the invention will be more readily apparent upon reading the following description of a preferred exemplary embodiment of the invention and upon reference to the accompanying drawings wherein:
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Asher Kimberly L.
Leydig , Voit & Mayer, Ltd.
MAN Roland Druckmaschinen AG
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