Winding – tensioning – or guiding – Convolute winding of material – With particular drive
Reexamination Certificate
1999-09-08
2002-03-26
Mansen, Michael R. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With particular drive
C242S534000, C242S595100
Reexamination Certificate
active
06360983
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No.198 42 188.5, filed on Sep. 15, 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 concerns a reel winding device having a winding bed with two support rolls that form side walls of a pressure chamber which is also bounded by a bottom wall.
2. Discussion of Background Information
In one of the final production steps, paper webs are usually cut to the proper width and then wound into reels before being packaged and delivered. In contrast to the drums used during paper production, the winding cores onto which the paper reels are wound have only relatively slight rigidity and load-bearing capacity. They are often constructed, e.g., as cardboard tubes. This leads to the paper reels usually being supported during winding by supporting rolls. This occurs particularly when the winding device is structured as a support roll winding machine. Here, the reel lies on support rolls without additional holding forces gripping the core. But even with a support roll winder, in which additional holding elements grip the reel core, the reel is supported on a roll. When the paper reels become larger and heavier, the linear support forces of the paper reel become relatively large on the support roll or rolls, which has the disadvantage of increasing the winding tightness. This can lead to a subsequent failure in the winding structure of the roll. To relieve the pressure on the reels and to reduce the linear force, a pneumatic overpressure can be generated under the reel so that at least part of the reel weight is supported by an air cushion.
The air cushion is generated in the pressure chamber. The pressure chamber is bounded on the left and on the right by the two support rolls, by the winding reel on the top, and by the bottom wall on the bottom. Additional sealing measures, which are, however, of secondary importance for the present invention, are provided for the ends. During operation, the bottom wall should move as close as possible to the support rolls. If the material web enters the winding bed from below, it is not desirable for the bottom wall to touch the material web. However, a sliding contact with the other support roll which is not surrounded by the material web may be permitted if the surface of the bottom wall is appropriately structured. In most cases, however, a small gap is permitted with two support rolls.
However, the requirement that the bottom wall be as close as possible to the support rolls makes handling of the reel winding device more difficult when a new material web is to be introduced into the winding bed. This is nonetheless essential from time to time, for example, after a web break. The threading of the material web into the narrow gap between the corresponding support roll and the bottom wall takes a relatively long time. In the event of a web break, a paper jam, which can only be removed with great effort, may occur in the pressure chamber. In the worst case, it can even cause destruction of the seals or of the support roll.
DE 195 24 905 A1 proposes placing the bottom wall, which is structured as a sealed box, on a movable carrier. In other words, the bottom wall is completely pivotable from its operating position into a resting position.
However, this procedure requires a significant design outlay. Normally, the bottom wall must cover the entire axial length of the winding device. This is usually the working width of an upstream paper machine and may be as much as 10 meters. This design makes it difficult to maintain a constant sealing gap between the support rolls and the bottom wall. The application and retraction of the bottom is relatively expensive since large masses must be moved.
SUMMARY OF THE INVENTION
The present invention provides for a reel winding device which includes a winding bed composed of two support rolls that form side walls of a pressure chamber, and a bottom wall having at least one movable sealing body disposed between the bottom wall and at least one support roll. In the device, at least one movable sealing body is adapted to move in a direction away from the winding bed and may be loaded with a positioning force, such as a force spring, in the direction of a sealing position or may be loaded with a path-length independent force from a positioning motor. The positioning force may be substantially in equilibrium with the sum of the weight of the sealing body and a force resulting from a compressed air load. The at least one movable sealing body may work in cooperation with a stop motion device and/or with a position sensor, which emits an error signal in the event of a displacement of the sealing body away from the support roll.
In another embodiment, the at least one movable sealing body contacting the support roll may be a sealing edge, which may also be movable along a plane which is sloped relative to a perpendicular mid-plane through the winding bed. The bottom wall of the device may be sloped in the direction toward the sealing body. The device may further include a stationary seal disposed between the bottom wall and one support roll, such that the direction of rotation of the one support roll runs from the bottom wall to the winding bed.
The present invention provides for a process for supporting a winding reel on an apparatus that includes a winding bed formed by two support rolls that form side walls of a pressure chamber, and a bottom wall having at least one movable sealing body disposed between the bottom wall and at least one support roll, the process including: rotating the winding reel, rotating the support rolls, and positioning the at least one movable sealing body in a vicinity of a circumferential surface of at least one support roll. The process further includes moving the at least one sealing body in a direction away from the winding bed. The process further includes loading the at least one movable sealing body with a positioning force, such as a spring force, in the direction of a sealing position or loading the at least one movable sealing body with a path-length independent force from a positioning motor. The positioning force may be substantially in equilibrium with the sum of the weight of the sealing body and a force resulting from a compressed air load. The at least one movable sealing body may cooperate with a stop motion device and/or with a position sensor, which emits an error signal in the event of a displacement of the sealing body away from the support roll.
In another embodiment, the at least one movable sealing body contacting the support roll may be a sealing edge, which may also move along a plane which is sloped relative to a perpendicular mid-plane through the winding bed. The bottom wall may be sloped in the direction toward the sealing edge. The process further includes disposing a stationary seal between the bottom wall and one support roll, such that the direction of rotation of the one support roll runs from the bottom wall to the winding bed.
The present invention is also concerned with simplifying handling in the zone of the seal, particularly in a reel winding device of this invention where a movable sealing body is disposed between the bottom wall and at least one support roll.
This has several advantages. The bottom wall can be structured as a “blow box”, i.e., a body with a certain extension into the chamber, and can be disposed rigidly, i.e., immovable relative to the support rolls. Thus, the necessity of moving relatively large masses is avoided. The bottom wall can be positioned with relatively high precision relative to the support rolls. This position can be maintained during operation without the necessity of a complex structure. In addition, the shape of the bottom wall or of the blow box can also remain unchanged. For example, a normal rectangular profile with its shape-related stability is possible. Changes in the geometry are effected
Greenblum & Bernstein P.L.C.
Mansen Michael R.
Voith Sulzer Sulzer Papiertechnik Patent GmbH
LandOfFree
Reel winding device and process for supporting a winding reel does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reel winding device and process for supporting a winding reel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reel winding device and process for supporting a winding reel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2840151