Printing – Embossing or penetrating – Rolling-contact machines
Patent
1998-09-17
2000-11-07
Eickholt, Eugene
Printing
Embossing or penetrating
Rolling-contact machines
101488, 101 35, B41F 107
Patent
active
061420697
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
Devices and method for conveyance of sheets.
The invention relates to a method and devices in accordance with the preamble of claims 1, 2, 3 and 8.
The WO 94/18103 discloses a machine for processing sheets with a pair of laminating rollers and a cutting cylinder, with conveyor belts. In this machine, neither the laminating rollers nor the cutting cylinder may be exchanged. In order to be adjusted to the length of a sheet, the cutting cylinder is driven with a variable speed. The transporting speed of the conveyor belts is constant with respect to the speed of the pair of laminating rollers.
The drawback in this case is that the circumferential speed of the pair of laminating rollers and of the conveyor belts may not be varied one in respect to the other, in order for example to compensate for changes in the thickness of the foil.
The usable circumferential surface of the laminating roller may neither be adjusted to the length of sheets.
One main drawback is the fact that after the pair of laminating rollers, the sheets are not displaced by moving transporting means.
The invention is based on the object of providing a method and devices for conveying sheets.
The DE 29 31 194 A1 discloses a hot stamping machine for a material packaging band.
This object is achieved according to the invention by means of a method and devices having the features of the characterizing parts of claims 1, 2, 3 and 8.
Advantageously, the method and devices according to the invention allow 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 preselecting 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 th
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Eitel Johann Emil
Schaede Johannes Georg
De La Rue Giori S.A.
Eickholt Eugene
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