Roll or roller – With specific roller exterior surface structure – Surface projections – indentations – or slits
Reexamination Certificate
1999-10-13
2001-11-06
Cuda-Rosenbaum, I (Department: 3726)
Roll or roller
With specific roller exterior surface structure
Surface projections, indentations, or slits
C492S038000
Reexamination Certificate
active
06312367
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an anilox roller with cells, arranged over the sleeve surface along one or several spiral lines.
2. Description of the Related Art
Such anilox rollers are used, for example, as inking rollers in printing machines. Usually the anilox roller is a part of a doctor system, as disclosed, for example, in the DE 195 16 223 C2, for a spray inking unit of a rotary printing machine. Said doctor system comprises a doctor blade holder, which is formed by a profile strip with a channel-shaped recess and to which are fastened two doctor blades, which can be employed at the anilox roller and which together with the anilox roller, the channel-shaped recess of the doctor blade holder and seals, provided on the ends of said holder, define an ink chamber. To prevent the ink from issuing between the seals and the anilox roller, the anilox rollers are provided with cell-free sections in the end regions, where the seals rest against said rollers. However, this design has the consequence that the doctor blades, employed at the anilox rollers, are subject to non-uniform wear, because they exhibit more substantial wear in the region of the cells.
SUMMARY OF THE INVENTION
Therefore, the object of the invention is to provide an anilox roller of the type described in the introductory part, which results in the doctor blade, employed at the said anilox roller wearing as uniformly as possible over its length. Furthermore, the goal is also to prevent the ink from issuing between the seals and the anilox roller, a feature that is undesired.
The invention solves this problem according to a first proposal in that at least in one end region of the anilox roller the spiral line is interrupted by a narrow section that exhibits no cells.
Since the entire length of the anilox roller is provided with cells, the length of the doctor blade, employed at said roller, is subject to an essentially uniform wear. The cell-free section can be very narrow and amount to 0.2 mm for example, so that it does not have a negative impact on the essentially uniform wear of the doctor blade over the length of the anilox roller. The narrow, cell-free section has the effect that the transport of ink is interrupted and the ink does not issue between the seals and the anilox roller.
The problem is solved according to a second proposal in that at least one section of the anilox roller is provided with cells, which are arranged on spiral lines with shallower pitch. This design, too, has the effect that the doctor blade, employed at the anilox roller, is worn essentially uniformly over the length of the anilox roller. The end section, where the cells are arranged on spiral lines with shallower pitch, prevents the ink from issuing in an undesired manner between the seal and the anilox roller.
The problem is solved by a third proposal in that an end section of the sleeve surface of the anilox roller is provided with spiral lines with opposite pitch, on which the cells are arranged. This design, too, has the effect that the doctor blade, employed at the anilox roller, will wear uniformly, thus preventing the ink from issuing in an undesired manner between the seal and the anilox roller.
The cells are designed expediently polygonally and preferably hexagonally; the cells, which follow in succession in the axial direction, are configured in such a manner that they engage so as to mesh. Hence, the cells, arranged on the spiral lines with shallow pitch, are arranged so as to follow closely in succession and to be separated only by narrow webs.
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patent: 3818830 (1974-06-01), Schultz
patent: 4773143 (1988-09-01), Okamura et al.
patent: 4982660 (1991-01-01), Hamm et al.
patent: 5191703 (1993-03-01), John
patent: 5222434 (1993-06-01), Smith et al.
patent: 6006665 (1999-12-01), Stuchlik et al.
patent: 40 36 661 (1992-06-01), None
patent: 195 16 223 (1996-11-01), None
patent: 2108014 C (1998-04-01), None
Cuda-Rosenbaum I
Jacobson & Holman PLLC
Windmoller & Holscher
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