Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Reexamination Certificate
1999-01-19
2001-01-23
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
C242S530400, C242S542300, C242S542400
Reexamination Certificate
active
06176449
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 198 01 874.6, filed on Jan. 20, 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 method and device for winding web sections into web section rolls, and more particularly, to a method and device for winding web sections into web section rolls which rest against a central roll in a number of winding position groups axially offset from one another in different circumferential positions. When the web section rolls reach a selected diameter, the web sections are cut and transferred to new roll cores.
2. Discussion of Background Information
Paper webs today are frequently produced on paper making machines where working width is greater than the width desired by the users in printing facilities and the like. In one of the last manufacturing steps, paper webs must be cut to the desired width and then rolled or wound. At least two or more separate web rolls are produced. Two different methods are known for winding these web section rolls. On the one hand, all of the web section rolls can be wound axially next to one another in a common winding bed constituted by two or more support rollers. This winding therefore takes place according to what is known as the “support roller” method.
A second method is the “backing roller” method, in which the individual separate web rolls are secured to a respective roll core. To adjust the winding tightness, which is determined by the pressure during winding, the web section rolls rest against a rider roll. If this rider roll is used jointly for all separate web rolls, it is also called a central roll.
When the separate web rolls are secured on their end faces, a certain spacing of the separate web rolls in the axial direction is required. Therefore, a number of winding position groups are provided, generally two, which are disposed against the central roll in different angular positions. The separate web rolls of different winding position groups are staggered relative to one another.
The “backing roll” method has proven to be useful. Nevertheless, problems may arise when the individual separate web rolls have reached their selected diameter, and it becomes necessary to transfer the web sections from the completely wound separate web rolls over to new roll cores. This situation occurs often, primarily when the cut material web comes from a jumbo roll or master roll, which has a significantly greater web length of the material web than the web length of the web sections on the separate web rolls. The path from the cutting location at which the web sections are cut, to the individual winding positions is of different lengths, thereby causing potential problems. Therefore, the individual web sections must be separately manipulated many times, a procedure that is complicated and cumbersome. In one situation, the web sections are cut so that a first winding position group is created. The separate web rolls in the first winding position group must then be slowly wound until the remaining web sections have reached a second winding position group (and others). Only then can the winding process continue as usual. Alternatively, all of the web sections are moved until they arrive in the last winding position group (generally the second group) and then the web sections associated with the first winding position group must be correspondingly cut.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a method and device for winding web sections into web section rolls that substantially obviates one or more of the problems arising from the limitations and disadvantages of the related art.
The device for winding web sections into web section rolls comprises a central roll having a circumference and an outer surface. The web section rolls rest against the central roll in at least two winding position groups. These winding position groups are axially offset from one another at different positions about the circumference of the central roll. The device also comprises a cutting device extending axially over the winding position groups, the cutting device being adapted for pivoting about the central roll through the winding position groups.
Additionally, another aspect of the device may comprise a securing device for securing a web section to the outer surface of the central roll. The cutting device of the invention may also be operable in two cutting directions. Alternatively, the invention may implement a combined cutting and securing device.
According to another feature of the invention, the central roll has a respective securing region adjacent to each winding position group (i.e., each winding position group comes into contact with a respective securing region), in which a securing force acts on each respective securing region. The securing region may also be adapted to be acted on with negative pressure by a securing device which generates a vacuum. Furthermore, the securing region may be acted on with negative pressure during winding and/or be disposed before one of the winding position groups with respect to the direction of rotation of the central roller.
Another aspect of the invention is directed to a method for winding web sections into web section rolls, comprising cutting a web section at the point where a web section roll contacts the central roll. When the web section roll reaches a selected diameter (e.g., when the web section is either too big or too heavy to handle), the cut web sections are transferred to new roll cores.
Furthermore, the method may comprise successively cutting the web sections of respective winding position groups (i.e., the web sections are cut in order to arrangement relative to the central roll and are not cut simultaneously).
Additionally, the method may further comprise using a single cutting device for cutting the web sections of all the winding groups, by moving the cutting device about the circumference of the central roll.
The method may also comprise affixing a new initial portion of each web section to the central roll, moving the cutting device into a starting position and affixing the new initial portion of each web section to a roll core.
Moreover, the method may further comprise suctioning the new initial portion of a web section against the central roll.
Also, the method may further comprise using the cutting device to transport the new initial portion of a web section.
The method may yet additionally comprise feeding the new initial portion of each web section into a last winding position group, affixing a predetermined number of web sections to the last winding position group, pivoting the cutting device to a first winding position group, and cutting the web sections not associated with the last winding position group in separate winding positions.
The method may still further comprise suctioning the web section against the surface of the central roll, and interrupting web tension upstream from a first winding position group with respect to the direction of rotation of the central roller.
Another method for winding web sections into web section rolls comprises moving a cutting device from a first position to a second position, when each roll reaches a selected diameter, cutting, with the cutting device, a first web section at a first winding group, removably affixing the first web section to the central roll, moving the cutting device from the second position to a third position, cutting, with the cutting device, a second web section at a second winding group, removably affixing the second web section to the central roll, moving the cutting device from the third position back to the first position, and transferring the cut web sections to respective new roll cores.
Further, the method may also comprise suctionally affixing the first web section to the central roll, and suctionally affixing the second web section to the central roll.
Still
Greenblum & Bernstein P.L.C.
Voith Sulzer Papiertechnik Patent GmbH
Walsh Donald P.
Webb Collin A.
LandOfFree
Process and device for winding partial webs into partial web... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process and device for winding partial webs into partial web..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process and device for winding partial webs into partial web... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2488022