Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Reexamination Certificate
1999-04-20
2004-03-16
Matecki, Kathy (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
C242S542000
Reexamination Certificate
active
06705562
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 198 18 944.3, filed on Apr. 28, 1998, 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 roll winding device, particularly useful in association with a reel cutter, comprising at least one support device comprising at least one carrying roll that is disposed with its axis in the lateral direction in the machine frame, which has a column device on the two axial ends of the carrying roll and these columns are connected to each other in the lateral direction by means of at least one cross bar. The invention also relates to a method of increasing the rigidity of such a roll winding device.
Although the description in the present specification is in connection with a roll winding device for winding a paper web, it will be readily understood that the invention and the discussion herein can be applied in the same manner with other material webs such as cardboard, films made of metal or plastic, or textile materials, and the like.
2. Discussion of Background Information
In one of the last production steps of paper manufacture, the paper web must be wound into marketable rolls. If the web has been produced in a greater width, it may also have to be brought to the correct width. In many cases, this lengthwise cutting (with respect to the axis of the web) takes place shortly before the winding.
A support device is generally provided for supporting the winding rolls during winding. This support device can, for example, comprise a winding bed that comprises two or more carrying rolls. For the sake of simplicity, all of the rolls of the support device are called carrying rolls in the present specification.
Column devices (also referenced herein as column systems) on the axial ends of the carrying rolls are provided to support the carrying rolls. In order to assure the vibrational rigidity and the stability of the entire machine frame, cross bars are usually inserted between the column devices and fixed to them. Once a stable frame has been constructed in this manner, the required functions are integrated into it.
The greatest stresses of the machine frame occur in the region of the carrying roll support. Vibrations are introduced there, for example, which are caused by imbalances in the carrying rolls that cannot be completely eliminated. In this position, however, the column devices cannot be connected directly, because the corresponding space is taken up by the carrying rolls. However, the farther the cross bars are removed from the carrying rolls, the larger in size and more stable the cross bars and the column devices must be.
SUMMARY OF THE INVENTION
The invention provides a roll winding device that has a particularly compact and inexpensive construction.
In particular, the invention provides a roll winding device of the type mentioned above by virtue of the fact that the at least one cross bar is embodied as a sealing box, which in turn is disposed beneath a winding bed and which also has a high mechanical stability so that it considerably increases the rigidity of the frame.
The sealing box is disposed in the immediate vicinity of the carrying rolls. This position is required by its function as a sealing box. When using winding beds to support the winding rolls (reels), as a rule, the winding rolls do not have to be held or supported at the winding core. Consequently, the force with which the winding roll rests on the carrying rolls of the winding bed increases as the diameter of the winding rolls increases. Therefore the contact pressure increases and with it, the winding hardness. In order to counteract this, a relief of the weight of the winding roll is produced with the aid of an air cushion. Compressed air is supplied to the winding bed to generate this air cushion. It is necessary to seal the winding bed so that the compressed air does not escape. As a consequence of this requirement, the sealing box must not be spaced too far apart from the carrying rolls.
In accordance with the invention, the sealing box, unexpectedly, can be utilized for an additional function. Specifically, it can also be used as a cross bar, which connects the two column devices to each other in the immediate vicinity of the carrying rolls. This achieves a stiffening of the machine frame right in the region where it can have the greatest effect. It is unexpected that the sealing box could be used successfully as a structural reinforcing element such as a cross bar in accordance with the present invention, because, for example, as indicated above, conventional wisdom dictates that structural reinforcing members such as cross bars must be spaced away from the carrying rolls a significant distance. Additionally, rather than providing a separate cross bar as a separate structural member, it has been unexpectedly discovered in accordance with the present invention, that the sealing box can be utilized to provide a sufficiently high mechanical stability. With higher air pressures and greater spans, the sealing box has to have a greater stability in order to prevent an outward buckling in the axial center of the winding bed, which could lead to a greater sealing problem, and thus it has been found that the sealing box may be successfully employed as a stiffening or structural element such as a cross bar.
The sealing box advantageously has a resistance moment W
x
of at least about 10
6
mm
3
per meter of length. With this resistance moment, the sealing box is sufficiently stable to increase the rigidity of the frame. The increase in rigidity is as great as with the installation of an additional cross bar. This is true not only for the static state, where the addition of another cross bar leads to a further increase in the rigidity of the machine frame. It is particularly important, specifically in the current disclosed embodiment, that the vibrational rigidity during operation is drastically improved (reduced) through the immediate proximity of the sealing box as a cross bar to the carrying roll bearings.
The sealing box advantageously supports a guide roll, and thus, the sealing box accordance with the present invention provides multiple functions. In this manner, other cross bars can be eliminated in order to reduce costs and to save on installation space.
In an alternative or additional embodiment, a second cross bar device can be embodied as a blade cross bar on which at least one longitudinal cutting blade device is disposed so that it can move in the lateral direction. Usually, two cross bars are required in this connection; namely one for the upper blade and one for the lower blade. In comparison to another cross bar, however, the two blade cross bars can be considered together.
Advantageously, the blade cross bar is disposed adjacent to the sealing box, wherein the blade cross bar is hollow and communicates with the winding bed by way of a number of air lines distributed in the lateral direction. In this instance, the blade cross bar, for example the blade cross bar for the upper blade, is also given another function. Namely, it conducts the air, which is required for the production of a pressure cushion under the winding roll, to the desired position in the lateral direction of the machine, i.e., it is used to distribute the compressed air required for the roll relief.
Preferably, the communication takes place by way of the sealing box. As a result, the air lines are also given additional tasks. One function they perform is to carry out the air transport between the upper blade cross bar and the sealing box. Additionally, they stiffen the machine frame in the longitudinal direction because they produce another mechanical connection between the cross bars in the longitudinal direction.
In some embodiments, the invention provides a roll winding device, comprising a winding bed and at least one support device comprising at least one carrying roll. The carryi
Greenblum & Bernstein P.L.C.
Matecki Kathy
Voith Sulzer Papiertechnik Patent GmbH
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