Winder and core for use in the winder

Abstract

Winder for winding a plurality of material webs running beside one another, e.g., paper or board webs, onto cores lying beside one another end to end in a winding bed formed by two carrier rolls, to form wound rolls. In the regions in which they abut one another, the cores have elements which can be compressed in the axial direction. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 10 2004 051 252.3 filed Oct. 21, 2004, the disclosure of which is expressly incorporated by reference herein in its entirety.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The invention relates to a winder for winding a plurality of material webs running beside one another, in particular paper or board webs, on to cores lying beside one another end to end in a winding bed formed by two carrier rolls, to form wound rolls.

2. Discussion of Background Information

Carrier roll winders are used for winding material webs, in particular paper or board webs, to form wound rolls. The carrier roll winders have a first and a second carrier roll, which lie beside each other and form a winding bed to accommodate cores, onto which the material webs are wound beside one another. As a rule, the material webs are produced as part webs from a single material web wound up on a full spool, in that the full spool passes through slitters as it is unwound in order to produce part webs and the then part webs are wound up onto the cores beside one another.

The fact that, in the winding bed, a plurality of cores consisting of paperboard are pressed against one other end to end by core guide heads, which in each case on the drive side and on the non-drive side move into the cores lying beside one another and onto which the material webs are subsequently wound, means that the paperboard cores lengthen because of the pressure of the layers of the material web roll wound onto the cores and under the additional load of a pressure roll, which presses on the wound rolls from above.

The lengthening of the cores is, for example, 1 part per thousand of their length. Since all the cores lying beside one another are “fixed” in their position by the clamping heads, that is to say cannot expand freely, great axial forces arise in the cores. These forces lead to the offset of the core centers in relation to one another, which considerably disrupts the quiet running during winding. It is possible for “swinging” of the wound rolls to occur, which necessitates a reduction in the winding speed. The fact that the wound rolls lying beside one another are not fixed centrally has a very detrimental effect. Therefore, they do not rotate cylindrically in a row but offset centrally, which leads to cores which are not seated centrally. The corresponding wound rolls then run out of true in the unwind of printing presses, which is not acceptable.

In order to provide greater quiet running, a winding method for wound rolls lying beside one another is disclosed by EP 0 792 245 B1, in which the coefficient of friction of the cores in relation to one another is to be reduced. For this purpose, the ends of the cores, while or before these are arranged in the winding positions, are treated with a medium which reduces the friction, or pieces of a material having a low coefficient of friction are placed on the ends of the cores. Alternatively, the axial thrust force between the cores is reduced, by a pressurized medium being led into the cores from lateral spool fixing devices and in each case expelled between the cores.

SUMMARY OF THE INVENTION

The present invention develops a winder of the type mentioned at the beginning in such a way that disruptions during winding of the wound rolls and during the further processing of the wound rolls are avoided.

According to the invention, in a winder of the type mentioned at the beginning, in the regions in which they abut one another, the cores have elements which can be compressed in the axial direction.

The invention also relates to a further winder of the type mentioned at the beginning which likewise ensures greater quiet running than in the case of known winders.

This winder is characterized in that, in the regions in which they abut one another, these cores have centering elements, the centering elements of cores lying beside one another in each case forming a form fit, at least in the axial direction.

Advantageous developments emerge from the subclaims, the description and the drawings.

Provision is advantageously made for the centering elements additionally to form a form fit in the tangential direction and/or in the radial direction.

The centering elements can also be formed, at least to some extent, as compressible elements. The desired compression therefore simultaneously has a centering function.

A refinement of the cores in which the centering elements are formed as conical projections or conical recesses is advantageous.

The invention also relates to the cores themselves which are suitable for use in the above described carrier roll winder. According to the invention, a core of this type is characterized in that, in the region in which it abuts an adjacent core, it has at least one element that is compressible in the axial direction.

Additionally or alternatively to this measure, one advantageous refinement is that, in the region in which it abuts an adjacent core, the core has a centering element which forms a form fit, at least in the axial direction, with a centering element of the adjacent core.

Advantageous developments emerge from the subclaims.

Other exemplary embodiments and advantages of the present invention may be ascertained by reviewing the present disclosure and the accompanying drawing.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention is further described in the detailed description which follows, in reference to the noted plurality of drawings by way of non-limiting examples of exemplary embodiments of the present invention, in which like reference numerals represent similar parts throughout the several views of the drawings, and wherein:

FIGS. 1-3 illustrate various configurations of cores in their regions abutting one another, as details in longitudinal section.

DETAILED DESCRIPTION OF THE PRESENT INVENTION

The particulars shown herein are by way of example and for purposes of illustrative discussion of the embodiments of the present invention only and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the present invention. In this regard, no attempt is made to show structural details of the present invention in more detail than is necessary for the fundamental understanding of the present invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the present invention may be embodied in practice.

Cores 1, 2 (FIG. 1) each have differently configured ends 3 and 4. The end 3 of the core 1 has a recess 5 with a substantially rectangular cross section in the abutting region with the core 2. Two projecting, conically tapering annular cross sections 6, 7 of the core 2 are inserted into the recess 5. These projecting, conically tapering annular cross sections 6, 7 are provided as compression regions for the lengthening of the cores 1, 2 which occurs. The compression regions, like the remaining regions of the core, are preferably composed of paperboard; however, they can also be composed of another compliant or compressible material.

If the recess 5 has a depth a, then the projections 6, 7 have a length of a+x, such that when the projections 6, 7 are accommodated completely by the recess 5, the projections can be compressed by the amount x for the purpose of length compensation. The compressible length x therefore ensures that the cores 1, 2 are not braced against each other. If the cores 1, 2 have a wall thickness of 12 to 15 mm, for example, the value x is, for example, 0.5 mm to 1.5 mm.

In another configuration (FIG. 2), a core 8 which abuts a core 9 has a conical depression 10. Once again, a projection 11 projects into the depression 10. A conical projection 12 at the end of the core 10 presses against said projection 11. Either only the projection 11 consists of a compressible material or only the projection 12 consists of a compressible material or both projections 11, 12 are compressible, at least in some regions. In this case, the lengths are chosen such that the projection 12 projects by a length a into the depression 10, which for its part has a depth a+y on its base 13, while it has a depth of only a−x on the top surface of the projection 11. This means that the projection 11 can be compressed by the amount x.

In a further exemplary embodiment (FIG. 3), the end faces of two cores 14, 15 are each provided with conical indentations on the end faces 16, 17. In this case, the core 14 has two conical depressions 18, 19, into which the corresponding projections 20, 21 of the core 15 project. The fact that the depth of the depressions 18, 19 only has the value a, while the projections 20, 21 have a height a+x, means that a clearance of a length x remains, in order to accommodate compression of the projections 20, 21. The fact that the dimension of the depressions 18, 19 only has the value a, while the corresponding projections 20, 21 have a height a+x, means that there remains an oversize of a length x, in order to accommodate the volume of the projections 20, 21, whose width expands as a result of the compression.

It is noted that the foregoing examples have been provided merely for the purpose of explanation and are in no way to be construed as limiting of the present invention. While the present invention has been described with reference to an exemplary embodiment, it is understood that the words which have been used herein are words of description and illustration, rather than words of limitation. Changes may be made, within the purview of the appended claims, as presently stated and as amended, without departing from the scope and spirit of the present invention in its aspects. Although the present invention has been described herein with reference to particular means, materials and embodiments, the present invention is not intended to be limited to the particulars disclosed herein; rather, the present invention extends to all functionally equivalent structures, methods and uses, such as are within the scope of the appended claims

List of Designations

• 1 Core
• 2 Core
• 3 End
• 4 End
• 5 Recess
• 6 Projection
• 7 Projection
• 8 Core
• 9 Core
• 10 Depression
• 11 Projection
• 12 Projection
• 13 Base
• 14 Core
• 15 Core
• 16 End face
• 17 End face
• 18 Depression
• 19 Depression
• 20 Projection
• 21 Projection

Claims

1. A winder for winding a plurality of material webs running beside one another, in particular paper or board webs, on to cores lying beside one another end to end in a winding bed formed by two carrier rolls, to form wound rolls, wherein, in the regions in which they abut one another, the cores have elements which can be compressed in the axial direction.

2. The winder for winding a plurality of material webs running beside one another, in particular paper or board webs, on to cores lying beside one another end to end in a winding bed formed by two carrier rolls, to form wound rolls, in particular as claimed in claim 1, wherein, in the regions in which they abut one another, the cores have centering elements, the centering elements of cores (1, 2; 8, 9; 14, 15) lying beside one another in each case forming a form fit, at least in the axial direction.

3. The winder as claimed in claim 2, wherein the centering elements additionally form a form fit in the tangential direction and/or in the radial direction.

4. The winder as claimed in claim 2, wherein the centering elements are formed, at least to some extent, as compressible elements.

5. The winder as claimed in claim 2, wherein the centering elements are formed as conical projections or conical recesses or depressions.

6. A core, in particular for use in a winder as claimed in claim 1, wherein, in the region in which it abuts an adjacent core, it has at least one element that is compressible in the axial direction.

7. A core, in particular for use in a winder as claimed in claim 6, wherein, in the region in which it abuts an adjacent core, it has a centering element which forms a form fit, at least in the axial direction, with a centering element of the adjacent core.

8. The core as claimed in claim 7, wherein the centering elements additionally form a form fit in the tangential direction and/or in the radial direction.

9. The core as claimed in claim 7, wherein the centering elements are formed, at least to some extent, as compressible elements.

10. The core as claimed in claim 7, wherein the centering elements are formed as conical projections or conical recesses or depressions.