Printing – Embossing or penetrating – Rolling-contact machines
Patent
1998-09-17
2000-09-05
Hilten, John S.
Printing
Embossing or penetrating
Rolling-contact machines
101 27, 101216, 101479, 101480, 1014071, B41F 502, B44B 500
Patent
active
061126519
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to a sheet processing machine in which a processing cylinder is arranged in such a manner that it can be changed.
SUMMARY OF THE INVENTION
The invention is based on the object of providing a sheet-processing machine.
Advantageously, the sheet-processing machine according to the invention allows sheets which are to be processed on a processing cylinder to be processed in close succession. Even with changing format lengths of the sheets which are to be processed, it is possible, by means of exchangeable processing cylinders of different diameters, to keep a spacing between two successive sheets to a minimum. Particularly in the case of foil-stamping machines with a continuous supply of an endless foil for applying patterns to sheets, it is important for the distance between two successive sheets to be made as small as possible, in order to ensure that the foil is well utilized.
A flow of sheets which is supplied, for example, in the form of a stream is advantageously adapted by means of a suction drum. If it is necessary to change a ratio from a first spacing between successive sheets to a second spacing between successive sheets, e.g. in the case of different format lengths, this is possible as a result of simply pre-selecting corresponding laws of motion of appropriate software of an individual drive, e.g. of a servomotor. Suction drums are particularly suitable for this purpose, since, in contrast to drums provided with gripper systems, they are able to take hold of and release a sheet in any position, thus allowing favorable movement sequences.
Moreover, it is advantageous that in order to adapt the device to a format length it is only necessary to exchange the processing cylinder. A downstream cooling roller or a delivery, for example, remain unchanged, as do conveyor belts connected between them. Just the speeds of the cooling roller, conveyor belts and of the suction rollers are adjustable with respect to one another. In this case, extremely fine adjustment of the conveying speed is possible in particular for the conveyor belts, in order to be able to adjust them to even the slightest changes in the speed at which the sheets are conveyed owing, for example, to paper quality, sheet thickness or the type of processing. In a particularly simple manner, this adaptation is effected by means of software-controlled individual drives.
Advantageously, the processing cylinder can be exchanged, since it is provided with running rolls arranged on its bearing plates. By means of these running rolls, the processing cylinder is displaced axially, in order to be exchanged, in guides which are fixed to the frame and moved onto a conveyor carriage. This operation takes place without further accessories, such as for example a crane, and without having to exert much force.
The processing cylinder is provided with suction strips, so that there is only a minimal passage which is not available for processing.
Furthermore, it is advantageously possible to use a sheet delivery with chain gripper systems which is known per se, since the spacing between two successive sheets is increased, following processing, to a spacing which is required for the chain gripper systems.
The sheet-processing machine can be adapted in a simple manner to different format lengths of the sheets to be processed.
The sheet-processing machine according to the invention reduces the consumption of material, e.g. of an expensive hot-stamping foil.
The downtimes required to exchange a processing cylinder and the adaptation of sheet-conveying means which interact with this cylinder are reduced considerably.
BRIEF DESCRIPTION OF THE DRAWINGS
The sheet-processing machine according to the invention is described in more detail below and is illustrated in the drawing, in which:
FIG. 1 shows a diagrammatic side view of a sheet-processing machine;
FIG. 2 shows a diagrammatic plan view of the sheet-processing machine.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
A stream feeder 1, which is connected upstream of a
REFERENCES:
patent: 3952651 (1976-04-01), Bolza-Schunemann
patent: 4046070 (1977-09-01), Halley
patent: 4176601 (1979-12-01), Szarka
patent: 4462311 (1984-07-01), Armelin
patent: 5463950 (1995-11-01), Cuir et al.
patent: 5546858 (1996-08-01), Stephan
patent: 5758874 (1998-06-01), Morrissette
Eitel Johann Emil
Schaede Johannes Georg
Colilla Daniel J.
De La Rue Giori S.A.
Hilten John S.
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