Device for winding of rolls and winding process

Details Device for winding of rolls and winding process Device for winding of rolls and winding process

2000-08-25

2003-03-04

Rivera, William A. (Department: 3654)

Winding, tensioning, or guiding

Convolute winding of material

Simultaneous winding

C242S542100, C242S530300, C242S541500, C242S541600

Reexamination Certificate

active

06527218

ABSTRACT:

CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. §119 of German Patent Application No. 199 40 665.0, filed on Aug. 27, 1999, 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 device for winding rolls with a pressure roll, divided axially into separate sections, that can be positioned on a roll arrangement. Further, the invention concerns a winding process for winding partial webs that were cut from a material web into material web wound rolls, in which a driven pressure roll bears onto the material web wound roll with a predetermined pressure.
The invention is described below using a material web, e.g., a paper web, however, it can also be utilized for all material webs that are processed similarly, e.g., wound.
2. Discussion of Background Information
Usually, paper webs are produced in widths larger than the ones used later by the processors. For instance, paper webs are produced in widths of about 8 or 10 m, though a printing plant requires widths of about 0.5 to 3.8 m. For this reason the paper web is cut into partial webs with the desired width in one of the last steps of the production process. The partial webs are then wound into material wound rolls with the winding of the partial webs that are cut from the same material web occurring simultaneously.
During the winding process, a progression of the winding tightness in the material web wound roll that decreases from the inside to the outside is desired. It is known for that purpose to load the material web wound roll at the beginning of the winding process with a pressure roll, i.e., to press it into a winding bed or against a contact roll. In a winding bed, the pressure roll has the additional purpose of preventing the material web wound roll, which is comparatively light at the beginning of the winding process, from coming out of the winding bed.
A pressure roll that is axially divided in separate segments, is known from DE 41 34 648 A1. This pressure roll does not contact the wound rolls, however, but touches a central contact roll. The pressure roll serves to press the material web against the driven contact roll in order to cause an interruption of the web tension
SUMMARY OF THE INVENTION
The present invention provides better control in a winding process.
The winding device of the above mentioned type includes sections that can be coupled in the axial direction by a coupling device and that have a common rotational drive.
Such a pressure roll makes it possible to apply an additional driving torque to the wound rolls as they form at the beginning of the winding process, and still keeps the cost of construction small. A separate drive is not necessary for every segment. One drive for all segments is sufficient, because the sections can be coupled in the axial direction. The rotational drive, therefore, moves several sections together. Additionally, this has the advantage that all material wound rolls are driven with the same circumferential speed so that the winding process occurs comparatively evenly for all winding wound rolls. Due to lateral profile variations, however, it is generally unavoidable, in the production of paper, that certain diameter variations occur at larger diameters. When such diameter variations are visible the wound rolls are already big enough that the rotational drive of the pressure roll is usually no longer necessary. Then the coupling can be disengaged and the drive turned off. The pressure roll then acts on the wound roll in question only through the contact pressure.
Here, it is advantageous when the sections are positioned on a carrier that is moveable relative to the winding arrangement, in which each section in the detached mode is moveable separately with respect to the carrier and is provided with a positioning drive. In this manner, the entire pressure roll can follow a diameter change in the wound rolls. As the diameter of the wound rolls increases, the carrier is moved, e.g., raised. When the predetermined diameter of the coil is reached, at which the drive of the pressure roll is no longer necessary, each section of the contact roll can be moved separately in relation to the relevant wound roll so that the section with the desired pressure can remain at the circumference of the wound roll. In this way, the fact is utilized that differences in the diameters of individual wound rolls is usually rather small. Therefore, even when the sections are moved separately in relation to the carrier, the carrier as a whole can still be moved in order to follow the overall growing diameter of the wound rolls.
Preferably, the contact roll is located above the winding bed, which is formed by at least two carrier rolls. The special advantage of the divided yet drivable pressure roll is evident in connection with such a dual-carrier roll winder. In such a dual-carrier roll winder, the wound rolls are wound essentially end to end. Only small distances, if any, remain between the separate wound rolls. With the divided pressure roll, the desired driving torque can still be introduced to the separate wound rolls and at the same time the pressure can be increased, while at larger diameters the separate wound rolls can be subjected to the necessary winding pressure even when their diameters differ.
Preferably, the rotational drive and the coupling device are connected to a control device that reacts to a diameter of the roll arrangement. The control device can determine the actual diameter of the coil, e.g., with the help of a sensor and then can disengage the coupling device and turn off the drive as a function of the diameter determined. The determination of the diameter can be made in a wide variety of ways, e.g., it can be actually measured and/or it can be calculated from the number of rotations of the wound rolls.
Preferably, at least a part of the rotational drive forms the coupling device. Thus, the rotational drive combines several functions. Therefore, it serves not only to drive the pressure roll but also to transmit equal torque to all the sections.
Here, it is especially preferred for the rotational drive to have a driven friction roll which is in frictional contact with all sections. When the friction roll is rotated all sections are rotated evenly, and they are also protected from rotation relative to one another by the frictional contact with the friction roll.
The sections are preferably positioned on pivoted levers that are acted upon by the positioning drive. This ensures relatively simple control of the motion of the sections of the pressure roll relative to the carrier. The positioning drive, which of course must be able to exert a certain amount of force, can, e.g., take the form on a piston-cylinder arrangement.
In an alternative design, provisions can be made to arrange the positioning drive inside of each section. This avoids external components and reduces the space needed. In this way, each section is preferably provided with an axially displaceable slider arrangement in which the slider arrangements can be operated from the end faces of the pressure roll. With the help of the slider arrangements, the separate sections can be engaged with each other. Here, in the simplest case bolts or comparable parts are shifted axially so that they form a fixed connection between neighboring sections in the direction of rotation. The activation from the end face of the pressure roll simplifies control.
Here, it is advantageous when a slider activation device is provided at a face end of the pressure roll that activates the slider arrangement of the neighboring sections in which the slider arrangements of the following sections are activated by the slider arrangements of the preceding section. The slider activation device can be formed, e.g., by a hydraulic piston-cylinder arrangement that creates the force with the help of hydraulic fluid to shift the first slider axially. This shifting motion of the first slider or the first sl

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