Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Reexamination Certificate
1999-11-04
2001-09-18
Rivera, William A. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
C242S530400, C242S533300, C242S542400
Reexamination Certificate
active
06290168
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 198 51 023.3, filed on Nov. 5, 1998, the disclosure of which is expressly incorporated by reference herein in its entirety.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a reel winding device having at least one winding bed to accommodate at least one winding roll which is formed by a center drum and a winder drum arrangement.
The invention disclosed herein is described in connection with winding a paper web onto a winding roll without, however, being limited to this particular application.
2. Discussion of Background Information
In one of the final paper manufacturing steps, paper webs are cut to a width suitable for a consumer, such as a printing plant, and then wound into winding rolls. Generally, a winding tube, made of cardboard or another material of limited stability, is employed as a roll core. The paper web is fastened onto the roll core. The paper web is then drawn onto the circumference of the roll core, thereby forming the winding roll by rotating the roll core or the winding roll being formed thereon.
The winding process must be precisely controlled, especially in the case of larger rolls. It is desirable that the winding roll be wound as tightly as possible. Particularly, the winding tightness should be as great as possible at the beginning of the winding process, i.e., when the winding roll is first being formed. The winding tightness may, however, diminish towards the outside of the winding roll.
In reel winding devices, so-called winder drum coilers are sometimes situated in a winding bed that is formed by two winding drums with at least one of the two winding drums being driven. When employing winding drum coilers, however, there is no support for the winding roll initially, e.g., at the roll core.
Another embodiment is designated as a so-called center drum winder. In this case, the winding roll is adjacent to a center drum, and the winding roll is supported laterally by a winder drum if necessary. Generally, several winding rolls, which are situated alternatingly on either side of the central drum with a corresponding gap, are wound simultaneously. A roll core holding device can be situated within the space located on the front side of the rolls so that, with the increasing roll diameter and an associated increase in weight, the winding roll can be supported at the roll core. This eases the weight in the nips between the winding roll and the center drum or the winder drum.
Allowing a pressure roller to act on the winding roll in order to achieve the greatest possible tightness at the beginning of the winding process is also known in connection with this. The force of the pressure roller is reduced during the course of winding and is ultimately eliminated at a predetermined diameter.
SUMMARY OF THE INVENTION
The invention disclosed herein provides further possibilities for increasing the winding tightness during the winding process.
This is accomplished, in a reel winding device of the type described in the introduction, with a winder drum arrangement that has a support body for each winding roll of an axial length that corresponds to that of the winding roll, and which has front sides with a predetermined extension at its axial ends, leaving a working space free in which a roll core mechanism can be inserted.
Based on the roll core mechanism described herein, the winding roll may be driven by means of the driven center drums, via a driven winder drum situated at its circumference, or it may be driven at the roll core. This permits the tension of the material web to be wound, such as a paper web, to be increased, which is important especially at the beginning of the winding process in order to achieve the greatest possible winding tightness. A roll core mechanism of this type could not be used until now because there was no space for it. In the heretofore known reel winding machines, the winding roll dips relatively low into the winding bed, at the initial stages of the winding process, due to its small diameter so that a holding device but not a mechanism could be accommodated, if necessary, on its front side. Due to the use of support bodies, however, whose width corresponds to the axial extension of the winding roll, support for the winding roll can now be provided along its entire length, which is important particularly at a later stage of winding when the winding roll has a large diameter and is therefore heavier. In the present invention there exists adequate space to accommodate the roll core mechanism at the beginning of winding. Further, where several winding rolls are wound on one side of the center drum, there is a support body for every winding roll. The support bodies on one side are arranged at intervals from one another that are adequate for accommodating the roll core mechanisms. Naturally, a corresponding winder drum arrangement made up of one or more support bodies can also be located on the other side of the center drum. The only limitation that exists in this case is that the width of the winding roll creating the “gap” must be sufficiently large to accommodate two roll core mechanisms. Generally, however, this can be achieved. If narrower winding rolls are required, the roll core mechanisms can be positioned at the axial ends of the reel winding device.
It is preferred for the support bodies to be formed by a stack of discs that are connected to one another in a detachable manner. This embodiment is particularly advantageous in cases where the cutting schemes change, i. e., when winding rolls of various widths are required. In this case, it is not necessary to keep a support body in stock and mount it for every roll, thereby keeping investment and labor costs low. The desired roll width can henceforth be obtained by putting different discs together laterally.
It is preferred for this purpose that all discs in a stack have essentially the same axial length except for a compensating disc if necessary. Therefore, only one type of disc is generally needed, which simplifies stock keeping and spare parts procurement. In individual cases, compensating discs may be necessary in order to keep the difference between the axial length of the stack and the winding roll from becoming too large. One can manage with discs of a single thickness since one does not want to continuously change the roll widths, but use predetermined graduations. Another advantage of the subdivision of the support body into discs is that it facilitates testing of different roll coatings on individual segments or discs which is more cost effective than it would be on wide winder drums. In addition, it is easier to employ more extravagant roll coatings on narrower sections than on wider winder drums.
In an especially preferred embodiment, every disc has an inflatable coating. The coating can be formed of rubber or another elastomer, thus reducing the load of the winding roll in the nip between the winding roll and the winder drum.
The support body is preferably arranged on a continuous shaft running along an axial length of the center drum. As a result, no large structural changes are required to use this invention with conventional center drum winders. With the exception of the thinner shaft, the support body operates essentially the same as a conventional winder drum.
The support body is preferably connected to the shaft so that it has torsional strength when the shaft is driven. This permits a drive mechanism, or an additional drive mechanism, if need be, of the winding rolls, to be utilized in the same manner as known center drum winders. In this case, however, the support body mechanism can be arranged relatively far towards the outside, i. e., outside the axial extension of the center drum, so that it does not interfere during winding.
It is preferred that the support body be adjustable along the axis of the shaft. As a result, it is possible to situate the support body at different locations along
Greenblum & Bernstein P.L.C.
Rivera William A.
Stora Publication Paper AG
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