Printing – Multicolor – Rotary machines
Patent
1996-09-10
1998-07-21
Fisher, J. Reed
Printing
Multicolor
Rotary machines
101180, B41F 508, B41F 522
Patent
active
057821828
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a printing system for a multi-color web-fed rotary printing press for sheet work.
DESCRIPTION OF THE PRIOR ART
Printing units in an H-shape, disposed in a tower arrangement one on top of the other, for example as a so-called tower of eight, are known from a company brochure of MAN-Roland Druckmaschinen AG (DE) (RA GEO 08.93.1). In this case, a printing unit in an H-shape consists of two printing units, each in a U-shape, and which are disposed mirror-reversed in respect to each other, which are also called U-printing units and which each have four cylinders in a bridge construction.
It is disadvantageous in connection with these printing units disposed on top of each other in tower construction that the paper web to be printed must travel over a comparatively long distance between the printing points, for example between the two printing units in an H-shape placed on top of each other to form a tower of eight, which can lead to registration difficulties. Moreover, the prior art said printing units arranged on top of each other have a great structural height, so that the operators must work on at least two levels of different height. Finally, it is furthermore disadvantageous that the inking systems associated with the printing units at one time have a direction of the ink flow from the top to the bottom and at another time a direction of the ink flow from the bottom to the top in accordance with the mirror-reversed arrangement of the individual U-shaped printing units, which can lead to different inking conditions.
SUMMARY OF THE INVENTION
It is the object of the invention to create a printing system for a multi-color web-fed rotary printing press for sheet work having a lower structural height, but with the same output parameters as the prior art devices.
This object is attained in accordance with the invention by using a printing system for multi-color sheet work for a web-fed rotary printing press in which two printing units are arranged in the so-called bridge construction as bridge units. These units have two inking systems, two printing cylinders and two rubber blanket cylinders which are oriented toward each other. Several of these bridge units are disposed above each other. The bridge units disposed above each other can be separated into left and right frame elements that can be placed at a horizontal distance from each other.
The following advantages in particular are achieved by means of the present invention:
The printing press in accordance with the present invention has a lower structural height and therefore lesser weight which, among other things, reduces the cost for the press foundation. Because of the reduced structural height of the press, it can be operated on only one level. The ink flow in each printing unit always has the same direction, so that the same inking conditions prevail in all printing units. Because of the reduced structural height, the amount of waste during start-up and during braking operations, for example during printing plate changes, is reduced. Furthermore, because of the reduced structural height, the expense for a possible enclosure of the press are reduced. Such an enclosure can be of importance for reasons of noise protection or for recovery of heat in connection with air cleaning. Furthermore, the oscillations being created in a printing press are reduced by means of the reduction of the structural height. Moreover, when a wet offset printing process is employed, the action of the so-called fan-out effect is weakened because of the reduced structural height of the printing press. Registration difficulties that are encountered with conventional printing processes, are decreased. Finally, the printing units of the printing press in accordance with the invention can also be employed as additional printing units for a flying printing plate change (imprinter).
It is thus possible to avoid the purchase of expensive installations for a so-called computer-to-press method.
BRIEF DESCRIPTION OF THE DRAWING
REFERENCES:
patent: 5209159 (1993-05-01), Asanuma
Ruckmann Wolfgang Gunter
Schoeps Martin Heinz
Fisher J. Reed
Koenig & Bauer--Albert Aktiengesellschaft
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