Printing – Rolling contact machines – Rotary
Reexamination Certificate
2000-10-30
2003-11-04
Hirshfeld, Andrew H. (Department: 2854)
Printing
Rolling contact machines
Rotary
C101S233000, C101S410000, C101S483000, C271S197000
Reexamination Certificate
active
06640706
ABSTRACT:
BACKGROUND OF THE INVENTION
FIELD OF THE INVENTION
The invention relates to a guiding device for an areal printing material with a substantially two-dimensional structure, such as a sheet material, the guiding device having a guide surface facing the printing material. The invention further relates to a sheet-processing machine, in particular a rotary printing machine, equipped with such a guiding device.
A guiding device of the aforementioned type is disclosed, for example, by the published German Patent Document DE 196 02 514 C1. As this document discloses, high requirements are placed on guiding devices for sheet printing materials, and in fact, particularly on the guide surface formed thereon. They must be made especially smooth. Guiding devices used by the applicant therefore have a high-gloss polished guide surface. This requires particularly careful procedures in the production and handling of a conventional guiding device and, therefore, involves the risk of a given rate of wastage.
SUMMARY OF THE INVENTION
It is accordingly an object of the invention to provide a guiding device of the type mentioned in the introduction hereto, which can be produced with a possible wastage or reject rate that is considerably reduced.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, a guiding device for an areal printing material, the guiding device having an areal structure with a guide surface facing towards the printing material, the areal structure comprising a supporting layer, and a surface layer is included for forming the guide surface and covering the supporting layer.
In accordance with another feature of the invention, the guiding device includes at least one support which, together with the supporting layer, forms a subassembly.
In accordance with a further feature of the invention, the support is trough-like in structure, has feed and discharge openings, and is otherwise closed by the supporting layer.
In accordance with an added feature of the invention, the support and the supporting layer are sealingly joined to one another.
In accordance with an additional feature of the invention, the support has a trough base formed with elevations, and the elevations are joined to the supporting layer.
In accordance with yet another feature of the invention, the support and a respective one of the elevations, on the one hand, and the supporting layer, on the other hand, are sealingly joined to one another and, in a region of a respective one of the elevations, are formed with apertures communicating with one another, the surface layer being formed with openings communicating with the apertures.
In accordance with yet a further feature of the invention, the guiding device comprises a chamber arrangement forming domes due to the elevations of the trough base.
In accordance with yet an added feature of the invention, the surface layer is provided with nozzles, a respective one of the nozzles, on the one hand, forming one of the openings in the surface layer and, on the other hand, extending into one of the apertures formed in the supporting layer, which communicates with one of the openings.
In accordance with yet an additional feature of the invention, a respective one of the nozzles forms a shaped region of the surface layer.
In accordance with a concomitant aspect of the invention, there is provided a rotary printing machine having a guiding device for an areal printing material, the guiding device having an areal structure with a guide surface facing towards the printing material, the areal structure comprising a supporting layer, and including a surface layer forming the guide surface and covering the supporting layer.
In one configuration of the guiding device according to the invention, the supporting layer forms an underlayer for the surface layer forming the guide surface, and therefore does not have to rest smoothly on the surface layer over the entire area. In particular, the surface layer, in preferred improved constructions thereof, is shaped so that, in spite of a relatively small layer thickness, it has a dimensional stability which is sufficient for the requirements and, for example, fixing lugs molded on integrally or in one piece, whereas according to a further development, at least one support is provided which, together with the supporting layer, forms a subassembly.
The supporting layer can have deformations, for example, which are directed away from the surface layer covering the supporting layer and are formed as beads, so that, in particular, in the case of one development, wherein a support is provided that is joined to the sheet-like structure via a fastening on the supporting layer, at the bottom of the respective bead, the most varied types of connections or joinings of the supporting layer to a support are possible, without affecting the guide surface in any way thereby. Instead, the surface layer forming the guide surface bridges over the aforementioned beads and/or other irregularities or discontinuities which may be in the surface of the supporting layer facing the surface layer. In particular, therefore, the supporting layer can be screwed or welded to a support, at the base of appropriate beads on the supporting layer, to form a subassembly. However, welding the supporting layer to a support is possible even without the formation of beads in the supporting layer, even in the case of a given build-up of corresponding welds on that surface of the supporting layer which faces the surface layer, because a build-up which may have an effect upon the course of the surface layer can be ground off before the supporting layer is covered by the surface layer.
In a configuration according to the invention of the guiding device mentioned at the introduction hereto, in particular, no increased requirements are thus placed on the supporting layer, to the extent that it is the condition of a surface of the supporting layer which is covered by the surface layer.
The process of producing the aforementioned subassembly, therefore, does not require any special measures to protect surfaces of the parts belonging to the subassembly. Appropriate measures are required only during the completion of the guiding device, by covering the supporting layer by the surface layer, and the further handling of the completed guiding device. In the event of any damage which may occur to the guide surface in the process, such damage is restricted to replacing the surface layer so that costs arising from any reject, wastage or spoilage are noticeably lower than in the case of rejects during the production of conventional guiding devices.
In an advantageous improvement, the support is trough-like, it has feed and discharge openings and is otherwise closed by the supporting layer. If, in addition, a support of such a construction and the supporting layer are preferably sealingly joined to one another, a chamber results, through which a cooling liquid can be pumped. A guiding device constructed in such a way is therefore suitable for guiding a sheet printing material along path sections wherein heat is transferred onto the guiding device from a dryer.
In a preferred improvement, the aforementioned trough-like support has a trough base provided with elevations, and the elevations are joined to the supporting layer. Therefore, even with a relatively thin-walled construction of the supporting layer and of the support, the subassembly formed therefrom proves to be relatively stable dimensionally.
If, according to a preferred development of the support, the supporting layer and a respective one of the elevations of the support are sealingly joined to one another, the supporting layer, on the one hand, and a respective one of the elevations, on the other hand, in the area thereof, are provided with apertures which communicate with one another, and openings which communicate with the apertures are provided in the surface layer, then the aforementioned cooling liquid, as it flows through the chambers formed by the supporting layer and the
Gieser Michael
Kain Jörg Oliver
Schuster Mathias
Thoma Peter
Crenshaw Marvin P.
Greenberg Lawrence A.
Hirshfeld Andrew H.
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