Printing – Multicolor – Rotary machines
Patent
1996-11-26
1998-09-22
Fisher, J. Reed
Printing
Multicolor
Rotary machines
B41F 712
Patent
active
058098828
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a multi-color web-fed rotary printing press for job printing.
DESCRIPTION OF THE PRIOR ART
A multi-color web-fed rotary printing press with eight inking systems for job printing is known from a brochure of MAN-Roland Druckmaschinen AG, (DE), (Brochure No. 235 850 d/4.90.5pd; Polyman of DRUPA 1990), which consists of a roll changer, four printing systems arranged one behind the other, a dryer, a cooling unit, a turning bar arrangement and a folding apparatus in a horizontal arrangement. In this case, the inking systems for the printing units of the printing systems are arranged once below the horizontally extending paper web and once above the paper web
This prior art arrangement is depicted in FIG. 6 of the drawings.
GB-A-2 229 140 discloses a multi-color web-fed rotary printing press with several sheet printing systems disposed above one another. A paper web is supplied to the sheet printing systems by a roll changer. Following printing, the web runs through a drying chamber and finally into a folding apparatus.
The great length of the MAN-Roland printing press is disadvantageous in connection with the mentioned prior art multi-color web-fed rotary printing press, as well as are the large expenses for the construction of the press and the increased costs for enclosing space. Moreover, the paper web to be printed must pass over a relatively long distance between the printing points, which can result in registration difficulties. Finally, it is also 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, which can lead to different inking conditions.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a short multicolor web-fed rotary printing press for job printing of approximately the same structural height and with the same output parameters in respect to the prior art, having a plurality of so-called 1/1 printing units.
This object is attained in accordance with the invention by providing a multi-color web-fed rotary printing press for job printing that has several sheet printing devices which are supplied with paper from a roll changer. After the paper web has been printed, it is conveyed to a drying chamber and then to a folding apparatus. The printing system is comprised of several bridge printing units which are separable into left and right printing units that are mounted on left and right frame sections which are movable horizontally with respect to each other. These bridge units are located on a first plane and the drying chamber is located in a second plane situated above the first plane
The following advantages in particular are achieved by means of the present invention:
At approximately the same height as the prior devices, the printing press in accordance with the invention has a considerably reduced total length, because of which enormous construction expenses are saved. By means of a shortened configuration of the printing units, which moreover are also disposed on top of each other in a bridge construction, it has become possible to shorten a multi-color web-fed rotary printing press for job printing in a drastic manner. 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 distance between the printing units, the amounts of waste during start-up and braking operations, for example during printing plate changes, are reduced. Finally, the printing systems can also be employed as additional printing systems or as a printing system for a flying printing plate change (imprinter).
Further than that, because of the rapid exchangeability of the printing and rubber blanket cylinders for each printing unit, it is possible to achieve a good format variability of the printing systems. In the state of rest of the printing systems' a manual change of
REFERENCES:
patent: 2557381 (1951-06-01), Huebner
patent: 3892178 (1975-07-01), Staamann
patent: 4567673 (1986-02-01), Bohnensieker
patent: 4697515 (1987-10-01), Germann
patent: 4831926 (1989-05-01), Bowman et al.
patent: 5036763 (1991-08-01), Germann
Man-Roland Brochure; "Polyman"; Brochure #235 850; Apr. 1990.
Ruckmann Wolfgang Gunter
Schoeps Martin Heinz
Fisher J. Reed
Koenig & Bauer--Albert Aktiengesellschaft
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