Inker unit

Details Inker unit Inker unit

1999-11-08

2001-08-28

Asher, Kimberly L. (Department: 2854)

Printing

Inkers

Roller

C101S352040

Reexamination Certificate

active

06279473

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to an inking system for a printing unit of a web-fed rotary printing press. The inking system uses ink application rollers that are directly inked by a central, ink conducting roller. These ink application rollers are also indirectly inked a second time by an ink roller train that originates with the central ink-conducting roller.
DESCRIPTION OF THE PRIOR ART
A prior art short inking system for a rotary printing press is known from GB-PS 18 907 and DE 195 35 266 A1. The following steps are provided in this prior art device for improving the ink application to a forme cylinder:
a first ink application roller has a lesser diameter than the forme cylinder,
a first ink transfer roller or riding roller is placed against the first ink application roller,
The first ink transfer roller or riding roller is in contact with a further inking system roller,
this further inking system roller is an inking roller which is placed against a central inking roller—in this case a riding roller, for example—,
wherein, in relation to the direction of rotation of the central inking roller, the further inking system roller is in contact with the central roller ahead of the first ink application roller.
DE 35 45 720 A1 shows a short inking system with a screen roller wherein, with non-screened full surface printing, it is intended to achieve good ink coverage. To this end, the same principle of ink application, as with the above mentioned references GB-PS 18 907 and DE 195 35 266 A1, is applied. Two ink application rollers are employed, both of which are in contact with a screen roller. Following the transfer of ink by means of the first ink application roller to a first roller, the remaining ink application is transferred to an ink application roller in accordance with the ink splitting principle. The latter than transfers the ink to the first roller.
An inking system with two ink application rollers, one side of which can be brought into contact with a forme cylinder, is described in U.S. Pat. No. 2,751,843. On the other side, the two ink application rollers are in contact with a central inking roller. The ink application rollers are seated in spring-loaded rockers. The ink application rollers are seated in these spring-loaded rockers so that their position can be better matched to the contour of the forme cylinder.
SUMMARY OF TH INVENTION
The object of the present invention is based on providing an inking system for a rotary printing press.
In accordance with the invention, this object is attained by the provision of an inking system that uses a central ink-conducting roller to supply ink to ink application rollers. Ink may be supplied in both a direct path and an indirect path from the ink-conducting roller to the ink application roller or rollers. The ink application roller or rollers may be supported for movement into and out of contact with a forme cylinder.
The advantages to be gained by the present invention consist in particular, in that:
It is possible to provide the inking system with a low structural height and with the application of chamber doctor blades or doctor blade devices directly on a central inking roller which “distributes” ink, even with a short structural length.
It is possible to arrange several, for example two, inking roller trains, each of which is provided with a plurality of inking rollers, from the central inking roller, each of which provide an ink application to a common forme cylinder.
It is possible, in a simple manner, to generate a multitude of different ink separation options by changing the contact of the inking rollers with each other, or with the central inking roller.
By the placement of the plurality of inking rollers in a plurality of pairs of rockers, it is possible to adjust the plurality of the inking systems easily and rapidly, in spite of the restricted spatial conditions; i.e. the very close arrangement of the inking systems and printing units. The operator can reach each roller without contortions. In a particularly advantageous manner, it is possible to pivot each inking roller train by itself in such a way that the operator practically has all of the inking rollers of the respective inking roller train “in front of his stomach”.
Thus, with small space requirements, it is possible to house a relatively large number of inking rollers. It is possible, by means of the selective placement of inking rollers against the central inking roller, and by means of bringing the inking rollers into and out of contact with each other, to selectively change the thickness of the ink layer to be applied to the forme cylinder.


REFERENCES:
patent: 2751843 (1956-06-01), Faeber
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patent: 4232163 C2 (1995-06-01), None
patent: 19535266 A1 (1997-04-01), None
patent: 18907 (1915-06-01), None
patent: 48-89010 (1973-11-01), None
patent: 61-120754 (1986-12-01), None
patent: 5-502825 (1994-08-01), None

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