Printing – Multicolor – Processes
Patent
1999-04-26
2000-02-08
Asher, Kimberly L.
Printing
Multicolor
Processes
181220, 181225, 181228, 181483, 181484, 181485, B41M 114
Patent
active
060217138
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention is directed to an arrangement for correcting the fan-out effect on web-fed printing presses. A variable number of control elements act on a web printed in multiple printing units. These control elements control web width.
DESCRIPTION OF THE PRIOR ART
From German Utility Model DE 295 01 373 U1, a prior art apparatus of this general type is known in which two image control rollers are disposed between the second and third double printing mechanism of a rotary printing press which has four double printing mechanisms.
These image control rollers are supported freely rotatably on pivotable levers. Downstream of the fourth double printing mechanism there is situated a reading head for scanning register marks, and which is in communication with a control device. This control device, on the basis of a set-point and actual-value comparison device, furnishes signals which are imposed on an actuating device for positioning the image control rollers.
A disadvantage of this prior art apparatus is that with a paper web of great width traveling through a web-fed rotary printing press as described above, registration errors from the fan-out effect are unavoidable.
U.S. Pat. No. 5,383,393 describing an apparatus for compensating for the fan-out effect of a paper web. In it, rollers offset from one another are disposed on both sides of the web.
SUMMARY OF THE INVENTION
The object of the present invention is to create an arrangement for correcting the fan-out effect of a web printed in a wet offset web-fed rotary printing presses.
This object is attained according to the invention by providing a plurality of spaced apart control elements which act on the web. These control elements are situated on both sides of the web across the width of the web. The control elements on one side of the web are offset laterally, or in the direction of the web width, with respect to the control element on the opposing side of the web. The number of control elements acting on the web varies as a function of the moisture content of the web.
The advantages attainable by the present invention are, in particular, that the fan-out effect can be corrected even in paper webs of relatively great width, of the kind involved in printing telephone books, for instance, where there are printing units with double printing mechanisms of the so-called "figure eight tower construction". The double printing mechanisms may also be disposed in line with one another in a vertical orientation.
It is also possible to use printing units with one printing mechanism and with various printing cylinders. That is, one printing unit can comprise two printing mechanisms arranged blanket to blanket, or can comprise one printing mechanism with a counter pressure cylinder.
Each control assembly disposed between spaced ones of the printing units is adapted to the specific moisture content found there for the moving paper web. Furthermore, even in one-sided register deviations of the web, only those control elements and counterpart control elements that are needed for correcting the width registration in the effected portion of the web can be positioned individually, or in groups to contact the paper web.
BRIEF DESCRIPTION OF THE DRAWINGS
One preferred embodiment of the present invention is shown in the drawings and will be described in further detail below.
Shown are:
FIG. 1, a schematic illustration of the printing units, with control assemblies disposed in front of each of them that are part of a "fan-out compensating device, in a position of repose seen from the front, but without side frames taken that sections II--II, III--III and IV--IV in FIGS. 2-4 respectively;
FIG. 2, a schematic view of the arrangement of control elements in front of a second printing unit of FIG. 1, in a plan view;
FIG. 3, a schematic view of the arrangement of control elements in front of a third printing unit of FIG. 1, in a plan view; and
FIG. 4, a schematic view of the arrangement of control elements in front of a fourth printing unit of FIG.
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Glockner Erhard Herbert
Schaschek Karl Erich Albert
Asher Kimberly L.
Koening & Bauer Aktiengesellschaft
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