Printing – Multicolor – Rotary machines
Reexamination Certificate
1999-09-03
2001-03-27
Yan, Ren (Department: 2854)
Printing
Multicolor
Rotary machines
C101S230000
Reexamination Certificate
active
06205919
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a sheet-fed rotary printing machine for multicolor printing.
BACKGROUND OF THE INVENTION
For the printing of small-format printing sheets it is a known practice to use printing units in which the cylinders participating in the printing, such as a plate cylinder, a rubber cylinder and a printing cylinder, have different diameters. Thereby mechanical expenditure can be saved in the field of the printing plates, of the rubber blankets or of the printing cylinder.
From DE-PS 24 35 203 a sheet-fed rotary printing machine is known. It has, in the most diverse configurations, plate cylinders with simple or single diameter, a rubber cylinder with multiple diameter, and a printing cylinder with single diameter. Thereby from differently installable printing units from a particular plate cylinder, a partial image of a print image can be printed on one of several segments of the rubber cylinder. Simultaneously, this print image can be printed on a printing sheet guided on the printing cylinder, in which process the printing sheet with the printing cylinder revolves in correspondence to the movement of the segments of the rubber cylinder and is printed from this latter.
In U.S. Pat. No. 3,347,160 there is described an ink roller device for a multicolor rotary offset printing machine. This printing machine has a plate cylinder and rubber cylinder in each case with multiple diameter on which there is allocated a printing cylinder with single diameter. In the printing the printing plate consisting of several image parts is generated on the plate cylinder of several cycled inking and moistening mechanisms, transferred to the multiply large rubber cylinder and printed on a printing sheet guided on the printing cylinder. There the printing cylinder rotates a number of times corresponding to the diameter ratio between rubber cylinder and printing cylinder until all the print image parts are transferred to the printing sheet. This multiple color printing machine is suited for the so-called proof printing. The disadvantage in these devices is that they can be produced, to be sure, as single print units, but that the expenditure for the printing of images that contain more color than the particular printing machine permits is very high. These printing machines, accordingly, are suited only for special printing processes.
OBJECTS AND SUMMARY OF THE INVENTION
An object of the invention is to produce a machine configuration which, with the simplest manner of construction, has arbitrarily combinable printing units for generating printing sheets with differing number of colors, which does not require any exchanging of aggregates or assemblies, and is suited for a high throughput with arbitrary edition levels, in which printing sheets are to be producible in both-sided printing.
Anther object of the invention is to improve a device of the foregoing type
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that from standard elements a simple and therewith cheap printing machine results, which by the combination of components of this type with one another permits differently configurable multicolor prints, without the printing machine having to be refitted or having too low a performance, in which printing sheets printed on both sides are to be producible.
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 a print image on sheets in one or more colors on both sides of the sheet in which the sheet-conducting drums or cylinder are provided in each case with a working surface. Thereby there is yielded a slender sheet running and in all decisive positions sufficient space for the complete printing-out and an unhampered sheet turning. The resulting throughput reduction is balanced by the simplification of the machine concept.
Fundamentally all the plate cylinders are provided with two printing plates. Here it is especially advantageous that, on the basis of standard printing machines, simplified forms of execution of printing machines are produced which, with little expenditure permit economical printing processes, in which heed is given to a so-called slender sheet run, and with costs for the building of the machine that are reduced because of the simple elements.
For one, this can occur through the use of a printing cylinder provided with simple or single diameter, which rotates a number of times only for the reception of print images, while the other cylinders or drums, all equally large and provided with doubled diameter, rotate only at half the turning speed of the printing cylinder.
In a further form of execution the rubber cylinder is constructed as a cylinder provided with single diameter. In the proposed standard printing process proposed to that end it collects print images of different colors given on the plate cylinder and prints them in a single printing operation onto the printing sheets held on the printing cylinder.
REFERENCES:
patent: 2911907 (1959-11-01), Davidson
patent: 3347160 (1967-10-01), Rozee
patent: 3384011 (1968-05-01), Bolza-Schünemann
patent: 3949670 (1976-04-01), Katsuji
patent: 4621576 (1986-11-01), Wirz
patent: 5410965 (1995-05-01), DeVries
patent: 5469787 (1995-11-01), Turner et al.
patent: 24 35 203 C2 (1981-10-01), None
patent: 34 19762 A1 (1985-11-01), None
patent: 43 03 797 A1 (1994-08-01), None
patent: WO 95/25015 (1995-09-01), None
Leydig , Voit & Mayer, Ltd.
MAN Roland Druckmaschinen AG
Yan Ren
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