Printing – Multicolor – Rotary machines
Patent
1996-09-10
1998-02-17
Fisher, J. Reed
Printing
Multicolor
Rotary machines
101180, 101182, 101352, B41F 712, B41F 508, B41F 516
Patent
active
057181721
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
An offset web-fed rotary printing press is known from DE-PS 22 34 089, wherein the respective rubber blanket and plate cylinders, which operate against a stationary, seated printing cylinder, are disposed in a displaceable frame in order to separate the printing systems seated above each other for inserting a paper web.
DE-A-37 02 327 discloses a printing system for multi-color sheet work for a rotary printing press. Two printing units are combined in the so-called fold construction into bridge units. Each bridge unit has two inking systems, two printing cylinders and two rubber blanket cylinders, wherein the rubber blanket cylinders are disposed opposite each other. Several bridge units are disposed above each other.
It is disadvantageous in connection with this prior art offset web-fed rotary printing press that it is not suitable for sheet work.
Printing units in an H-shape, disposed in a tower arrangement one on top of the other, for example H on H as a so-called tower of eight, are known from a company brochure of MAN-Roland Druckmaschinen AG, Offenbach, Main (DE), (RA GEO 08.93.1). In this publication, a printing unit in an H-shape respectively consists of two printing units in a U-shape, which are disposed mirror-reversed in respect to each other, and which are also called U-printing units and respectively 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 printing systems 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 have a direction of 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 present invention to create a printing system for a multi-color web-fed rotary printing press for sheet work having a lower structural height.
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, central and right frame elements that can be placed at horizontal distances from each other.
The following advantages in particular are achieved by means of the 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 of the printing units. Because of the reduced structural height, the amount of waste during start-up and braking operations, for example during printing plate changes, is reduced. Furthermore, because of the reduced structural height, the expenses for a possible enclosure of the press are reduced. Such an enclosure can
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Ruckmann Wolfgang Gunter
Schoeps Martin Heinz
Fisher J. Reed
Koenig & Bauer--Albert Aktiengesellschaft
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