Roll winding device and method

Details Roll winding device and method Roll winding device and method

1999-07-15

2001-06-26

Jillions, John M. (Department: 3653)

Winding, tensioning, or guiding

Convolute winding of material

With particular drive

Reexamination Certificate

active

06250582

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 198 32 213.5, filed on Jul. 17, 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 roll winding device and method, and more particularly to a device and method using two carrying rollers which form a winding bed for receiving a wound roll.
2. Discussion of Background Information
A known roll winding device is discussed in German Patent Document No. DE 195 24 905 A1.
In one of the last production steps of producing paper webs, paper webs are usually cut to a desired width and then wound into rolls before they are packaged and shipped. The winding cores onto which the paper rolls are wound have a relatively low stiffness and carrying capacity, in contrast to the drums used during paper production. These cores are often cardboard tubes. As a result, paper rolls usually have to be supported by supporting rollers during the winding process. This is especially pronounced when the winding device is a carrying roller winder. In such a configuration, the roll rests on carrying rollers without any additional supporting devices acting on the core. But even in a supporting roll winder, where additional supporting devices act on the roll core, support is provided by a roller.
When the paper rolls become larger and thus heavier, the support line forces of the paper roll on the support roller or rollers become relatively large which has the disadvantage of causing winding hardness to increase. This winding hardness often causes the roll to split open later. To reduce the burden on the rolls and to reduce the line forces, pneumatic overpressure can be produced under the roll so that the roll is at least partially resting on an air cushion.
This measure is generally effective. However, a relatively large amount of air is needed to lessen the weight burden on the roll. With roll widths that change often, a relatively large amount of air escapes at the end regions. It is possible to reduce this loss of air by axially dividing the pressure chamber (i.e., parallel to the carrying rollers), into several sections and only providing air to the sections that are completely covered by the wound roll. However, this arrangement often leads to insufficient support from pressurized air in the edge regions of the wound roll. Also, if pressurized air is also provided to the areas that are not completely covered by the wound roll, a considerable loss of air will still occur.
SUMMARY OF THE INVENTION
The present invention provides a roll winding device and method. The roll winding device has two carrying rollers defining a winding bed adapted to receive a wound roll. Each roller has a respective longitudinal axis, the longitudinal axes being substantially parallel to one another. The device includes a pressure chamber arrangement having opposed sides, opposed ends and a bottom, each side being defined by a respective carrying roller, the bottom being defined by a sealing body, and an end wall present at each opposed end. At least one end wall is a mobile end wall adapted to move along an axis substantially parallel to the longitudinal axes of the carrying rollers.
The pressure chamber arrangement may be defined by two immobile end walls, and the mobile end wall may be present intermediate the two immobile end walls. Also, each immobile end wall may be present on a respective end of the sealing body. The device may alternatively include at least two mobile end walls each adapted to axially move in opposite directions relative to the axial center of the pressure chamber arrangement.
An air supply inlet located proximate the axial center of the pressure chamber arrangement may also be provided. Additionally, a plurality of air supply inlets adapted to discharge into the pressure chamber arrangement may be provided, and at least two of the air supply inlets may be adapted to be opened and closed. These air supply inlets may be actuated by one of the mobile end wall and a control device adapted to control the mobile end wall.
The mobile end wall may further include a sealing screen on an upper edge thereof, the sealing screen located in the winding bed. A sensor adapted to sense the wound roll may be located on the sealing screen. The sensor may be connected to an end wall driving device.
The roll winding method for use with the above roll winding device, may include moving the mobile end wall along an axis substantially parallel to the longitudinal axes of the carrying rollers.
The method may further include axially moving the mobile end walls in opposite directions relative to the axial center of the pressure chamber arrangement.
The method may additionally include discharging the air supply inlets into the pressure chamber arrangement and performing at least one of opening and closing of at least two of the air supply inlets. The at least two air supply inlets may be actuated by one of the mobile end wall and a control device adapted to control the mobile end wall.
A further method of winding a roll with the roll winding device may include placing an empty winding core in the winding bed, driving the winding core by the rotation of the two carrying rollers, pressing the winding core against the two carrying rollers and winding a material web about the rotating winding core. Each mobile end wall may be axially moved toward the axial center of the pressure chamber arrangement when the web roll has reached a predetermined size, until the sensor senses the ends of the roll. Pressurized air may be provided to the area defined by the carrying rollers, the sealing body, and the mobile end walls.
The present invention decreases air usage by including at least one end wall movable in a direction parallel to the axial direction of the carrying rollers.
The end wall can be adjusted so that a pressure chamber has the same axial length as the wound roll. Therefore, pressurized air is provided only along the axial length that is necessary to support the wound roll. No air cushion is created in areas located axially outside the wound roll. Therefore, no air is provided that can escape from this region. However, support from pressurized air is provided axially over the entire length inside the wound roll (i.e., where the wound roll rests on the carrying rollers). The end wall only needs to be moved proximate an end of the roller to delimit the pressure chamber. While a hermetic seal is not possible, the remaining gaps or holes are considerably smaller than the areas of known pressure chamber arrangements, which are not covered by the wound roll but were still provided with air.
A sealing body beneath the carrying rollers is usually an air receiver (i.e., it not only has a base plate, but it also has side walls) which axially extends proximate carrying rollers. Such an arrangement allows for control of the mobile end wall. It is also possible to construct the sealing body as a simple plate. The mobile end wall can be controlled on this simple plate or in another manner.
Preferably, a pressure chamber arrangement has two immobile end walls, between which at least one mobile end wall is arranged. The two immobile end walls give the pressure chamber arrangement stability. Not only do the immobile end walls limit the movement of the mobile end wall to prevent it from accidentally being moved out of the pressure chamber arrangement, but they also can be used to support driving elements for the mobile end wall. In addition, the immobile end walls limit axial pressure losses in the pressure chamber arrangement.
Each immobile end wall is preferably arranged on a respective end of the sealing body. A conventional air receiver may be used that extends across the entire axial length of the roll winding device (i.e., practically the entire axial length of the carrying rollers). Mobile end walls can then be used in such an air receiver.
Advantageously, at least two mobile end wal

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