Manufacturing container or tube from paper; or other manufacturi – Bending – Folding
Reexamination Certificate
2000-11-22
2003-08-05
Kim, Eugene (Department: 3721)
Manufacturing container or tube from paper; or other manufacturi
Bending
Folding
C493S424000, C493S427000, C493S431000
Reexamination Certificate
active
06602176
ABSTRACT:
BACKGROUND OF THE INVENTION
Field of the Invention
The invention relates to a method and a device for folding sheet-like copies, for example folding copies, which are produced in folders arranged downline from web-processing rotary printing machines.
Heretofore disclosed in the prior art, by way of the published European Patent Document EP 0 663 363 B1, is an arrangement for guiding web-like materials with at least one roller core and a plurality of lamella rings positioned thereon, and also a process for producing the arrangement. For guiding web-like materials, for example paper, textile or sheet-material webs, the arrangement is provided with at least one roller core and a plurality of lamella rings which are positioned thereon and formed of an elastic material. The lamella rings are arranged symmetrically to the axial central plane of the roller core and are lined up, in a mirror-inverted manner, in rows extending outwardly from the center. Axially abutting one another, they form a virtually continuous surface. The lamella rings have at least one predetermined point of inflection, the cross section of the lamella rings being somewhat Z-shaped.
When subjected to radial pressure, for example initiated by stressing which is exerted via an outgoing material web, the outer circumference is displaced axially and symmetrically to the axial center plane. In this regard, the cylindrical surface maintains the parallelism thereof to the roller axis. In this construction known heretofore from the prior art, the lamella rings may preferably be produced from (natural) rubber, plastics or similar materials.
The published German Non-prosecuted Patent Application (DE-OS) 29 05 545 is concerned with a folding roller. Coverings formed of pliant or yieldable plastic material are inserted in the jacket of the folding roller. Roller-surface regions formed of metallic material are left free between the coverings, the inserted coverings projecting slightly beyond the metallic-material regions. The coverings are prefabricated rings formed of slightly elastically deformable, for example elastomeric, plastic material. The rings can be inserted under prestressing in annular grooves which are provided in the roller jacket, the rings having, over the entire width thereof, a grooved arrangement formed by grooves extending at least approximately parallel to the folding-roller axis. The metallic surface regions between the rings, in contrast, have a smooth groove-free surface. This construction is intended to provide a folding roller which executes a particularly reliable conveying operation, allows air to flow out without obstruction, can be produced relatively straightforwardly and inexpensively, has a relatively long service life and has regions subjected predominantly to wear, which are renewable, as such, relatively easily.
Moreover, the published German Patent Document DE 37 43 642 A1 has disclosed a further folding roller. This folding roller has a cylindrical core element whereon, in order to form recesses at predetermined positions, sleeve-like sections formed of elastomeric material, and sleeve-like sections formed of metal are arranged so that they are displaceable relative to one another. In order to ensure that the metal sleeve-sections, which are knurled on the outside, are secured against relative rotation, circumferential grooves are recessed in the inner surface of the sections, and O-rings formed of elastomeric material are inserted in the circumferential grooves. Axial displacement of the metal sleeve-like sections is possible due to the O-rings, yet a friction lock in the circumferential direction is assured at all times. With this construction, it is possible, in an extremely straightforward manner, to adjust the recess between the individual sections in accordance with respectively provided linear applications of glue.
With multilayered folding copies, such as folded products having, for example, 8, 16, 24, 32, 48 or 64 pages, the folds of the innermost copy layers may rupture. Upon opening a multilayered folding copy which is held together at the folding spine thereof by connecting elements, for example, staples, it is possible, with fold rupturing, for the innermost layer to drop out of the copy, for example, a periodical or a magazine, because it is no longer held in place; the staples cannot any longer exert a retaining force on the innermost copy layer, which is also referred to as the central layer. At the folding spine thereof, the central layer undergoes a deflection of approximately 180°, due to which the respective printing substrate is subjected to very high stressing. Due to the printing, the subsequent drying, and the remoistening and cooling of the web, the printing substrate of the material web is exposed to widely varying thermal influences, as a result of which the mechanical properties thereof can change very unfavorably. In particular, the mechanical stability of the web may be reduced considerably by embrittlement, with the result that pronounced stressing, for example, in the form of a 180°-deflection, promotes the occurrence of fold ruptures. The rest of the layers which enclose the central layer are relatively unsusceptible to the occurrence of fold ruptures because the folding spine in each copy layer becomes rounded to an appreciable extent as the number of copies increases.
SUMMARY OF THE INVENTION
Departing from the aforementioned technical problem and the outlined prior-art solutions therefor, it is an object of the invention to provide a method and device for folding sheetlike copies, which avoids the occurrence of fold ruptures on folding copies and increases the copy quality to a significant extent.
With the foregoing and other objects in view, there is provided, in accordance with one aspect of the invention, a method for folding sheet-like copies, respectively, made up of a plurality of copy layers, whereby open ends and closed folding spines are formed on the copies by folding operations, which comprises forming the folding spine on the inner copy layers of the copy in a manner that the folding spine is interrupted by non-folded sections.
In accordance with another mode, the method of the invention includes maintaining the folding spine rounded in the region of the non-folded sections.
In accordance with a further mode, the method of the invention includes locating the non-folded sections of the folding spine in a region of stapling or stitching positions.
In accordance with an added mode, the method of the invention includes arranging the stapling or stitching positions on the folding spine in a format-dependent manner.
In accordance with an additional mode, the method of the invention includes forming the folding spine parallel to the grain of material forming the copy.
In accordance with yet another mode, the method of the invention includes forming the folding spine with non-folded sections by pushing the copy layers into a nip between folding rollers.
In accordance with yet a further mode, the method of the invention includes forming the folding spine with non-folded sections, during a cross-folding operation, upon transfer of the copies from one copy-guiding cylinder to a next following copy-guiding cylinder.
In accordance with another aspect of the invention, there is provided a device for folding sheet-like copies, respectively, made up of a plurality of copy layers, the copies being formed by folding operations with regions having open ends and closed folding-spine regions, and folding components for producing the folding-spine regions on the copies, at least one of the folding components being provided for acting linearly on the copy layers of a multilayered folding copy, comprising surfaces defining recesses provided in the folding components for forming a folding spine on the copy layers of the respective copies, the folding spine including non-folded sections and longitudinally folded sections.
In accordance with a further feature of the invention, the recesses are formed on the folding components with a width corresponding to a measure
Greenberg Laurence A.
Heidelberger Druckmaschinen AG
Kim Eugene
Locher Ralph E.
Stemer Werner H.
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