Sheet feeding or delivering – Feeding and delivering – Conveyor releases to subsequent conveyor
Reexamination Certificate
1998-09-17
2001-02-06
Skaggs, H. Grant (Department: 3651)
Sheet feeding or delivering
Feeding and delivering
Conveyor releases to subsequent conveyor
C271S003230, C271S266000, C271S270000, C271S276000, C271S196000
Reexamination Certificate
active
06182959
ABSTRACT:
The invention relates to a method and devices in accordance with the preamble of claims
1
to
4
.
DE 44 13 238 A1 has disclosed a method for conveying sheets. To do so, it is intended that components of a machine should be controlled synchronously with the selectable spacings between the sheets. Machine components for carrying out this method are not described in more detail in DE 44 13 238 A1.
WO 94/18103 describes a device for producing a sequence of individual sheets for a laminating machine. To do this, the sheets are taken hold of by an acceleration roller and clamping rolls and are accelerated. The speed of the acceleration roller, based on the machine s peed, is not adjustable.
U.S. Pat. No. 4,451,027 has disclosed a device for changing the spacing between sheets by means of a plurality of conveyor devices, spacings being increased and reduced.
DE 30 07 249 A1 shows a feed table with suction rollers.
EP-0,244,484 A1 describes a device for feeding sheets at uniform spacings to a stamping machine.
The invention is based on the object of providing a method and devices for conveying sheets.
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
, to
4
.
Advantageously, the method a nd 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 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 method and device according to the invention reduce the consumption of material, e.g. of an expensive hot-stamping foil.
The down times required to exchange a processing cylinder and the adaptation of sheet-conveying means which interact with this cylinder are reduced considerably.
REFERENCES:
patent: 2686052 (1954-08-01), Winkler et al.
patent: 3199864 (1965-08-01), Irvine
patent: 3789286 (1974-01-01), Towns et al.
patent: 4451027 (1984-05-01), Alper
patent: 5105363 (1992-04-01), Deagon et al.
patent: 5423527 (1995-06-01), Tranguilla
patent: 5711518 (1998-01-01), Portoso et al.
patent: 5848784 (1998-12-01), Tranguilla
patent: 30 07 249 (1981-09-01), None
patent: 94 16 233 U (1981-09-01), None
patent: 195 23 363 (1996-11-01), None
patent: 44 13 238 A 1 (1999-10-01), None
patent: 0 244 484 (1987-11-01), None
patent: 0 731 046 (1996-09-01), None
patent: WO 092012079A (1992-07-01), None
Eitel Johann Emil
Schaede Johannes Georg
De La Rue Giori S.A.
Pitney Hardin Kipp & Szuch LLP
Skaggs H. Grant
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