Printing – Processes
Patent
1998-03-13
2000-04-11
Eickholt, Eugene
Printing
Processes
101226, 101227, 270 5207, 270 5209, B41F 1356
Patent
active
060476427
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a process and an apparatus for producing printed matter, such as forms and publicity material.
2. Description of Related Art
Processes and apparatuses which are intended for producing printed matter and in the case of which material strips of a continuously fed flexible material web are cut at in-register intervals and applied to a further continuously supplied material web are known. As the operating speed increases, however, the cut-off length of the material strips may be different and, in many cases, it is no longer possible to produce neat cut edges. This results in more rejects being produced, which is increases the costs of the printed matter.
SUMMARY OF THE INVENTION
An object of the present invention is thus to specify a process and an apparatus which are intended for producing printed matter and, in the case of varying thicknesses of the second material web and varying cut-off lengths of material strips produced therefrom, always produce a neat cut edge.
This object is achieved by a process having the features of continuously feeding a first flexible material web at a substantially constant first predetermined speed, feeding a second flexible material web to a cutting station at a substantially constant second predetermined speed lower than the first predetermined speed, cross-cutting the second flexible material web into strips at the cutting station with a cutter that moves at a speed approximately equal to the first predetermined speed, increasing a supply speed of a leading end of the second flexible material web to a speed higher than the second predetermined speed in a region of the cutting station before cross-cutting, lowering the supply speed of the leading end of the second flexible material web after cross-cutting and applying the strips of second flexible material to the first flexible material web at registered intervals at a conveying speed approximately equal to the first predetermined speed.
This object is also achieved by an apparatus having the features of a first conveyor that conveys a first flexible material web at a substantially constant first supply speed, a second conveyor that conveys a second flexible material web at a substantially constant second supply speed lower than the first supply speed, a cutting station that cuts the second flexible material web into strips and a speed adjuster located upstream of the cutting station that periodically increases a supply speed of a leading end of the second flexible material web.
The invention is based on the findings that the circulating cutter acts on the second flexible material web, fed at a slower supply speed, before the actual cutting operation takes place. If, then, shortly before the cutting operation, the leading end region of the second material web is supplied at approximately the same speed as the speed of circulation of the cutter, then the tearing-off action to which the second material web is subjected by the cutter is reduced considerably, this resulting in a neat cut edge even in the case of very wide material webs or in the case of the production of material strips with a short cut-off length.
The great advantage of the invention is that material strips are always produced with a high accuracy of cut and, at the same time, there are no longer any significant delays in the supply of the material strips to the first, continuously fed flexible material web, this resulting in in-register application of the material strips in all circumstances.
If the second material web is fed by a curved suction surface, e.g. the lateral surface of the suction roller, the duration over which the cutter acts on the second material web before the cutting operation is reduced further, this achieving an additional improvement in the actual cutting operation.
BRIEF DESCRIPTION OF THE DRAWINGS
Further advantages can be gathered from the following description. In the latter, the invention is explained in more detail with reference to exemplary embodim
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patent: 3937452 (1976-02-01), Gath
patent: 4896605 (1990-01-01), Schroder
patent: 5390599 (1995-02-01), Matsumoto et al.
patent: 5452632 (1995-09-01), Durr et al.
patent: 5458062 (1995-10-01), Goldberg et al.
patent: 5640835 (1997-06-01), Muscoplat
patent: 5711225 (1998-01-01), Rasmussen
patent: 5720223 (1998-02-01), Mesch
Eickholt Eugene
Hunkeler AG Papierverarbeitungsmaschinen
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