Winding – tensioning – or guiding – Convolute winding of material – With cutting – perforating – or notching
Reexamination Certificate
1999-02-04
2001-05-15
Jillions, John M. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
With cutting, perforating, or notching
C242S527700, C242S532300, C242S580000
Reexamination Certificate
active
06230998
ABSTRACT:
CROSS-REFERENCE TO RELATED APPLICATIONS
The present application claims priority under 35 U.S.C. § 119 of German Patent Application No. 198 04 411.9, filed on Feb. 5, 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 method for transferring a web of material from a wound roll onto a winding tube, in which a severing region of the web of material is provided with an adhesive surface and severed. The severing region is arranged to surround a circumferential portion of a carrier roll. The present invention also relates to a winding apparatus having two carrier rolls that form a winding bed, a severing device, an adhesive applicator, and a retaining device.
2. Discussion of Background Information
A method and winding apparatus of the type generally described above have been disclosed, e.g., in German Patent Disclosure DE 40 29 180 A1. These winding apparatuses serve to wind up a web of material, e.g., a paper web, into wound rolls that can be utilized by a user, e.g., a printing plant. As a rule, the length of the web of material is greater than what can be wound onto the wound roll. This happens, e.g., when the web of material is paid out from a larger jumbo or mother roll or when the web of material is produced in a continuous type of production process. In these type configurations, it is necessary, from time to time, to severe the web of material. The end of the web of material is then glued firmly to the fully wound roll, and the leading end of the web of material, i.e., the other side of the severing line, is to be fastened to a winding tube so that a new wound roll may be wound.
In known apparatuses for changing wound rolls, e.g., as disclosed in German Patent Disclosure DE 40 29 180 A1, the web of material is perforated before it contacts the carrier roll. As the web of material continues moving, e.g., into the region of the carrier roll, the web is provided with strips of adhesive that were previously stuck onto a transfer roller at low adhesion. When the web of material is to be severed, a somewhat greater tensile stress is sufficient to tear through the web of material along the perforated line.
A similar procedure is disclosed in European Patent Disclosure EP 0 553 232 B1. Again, the web of material is made sticky prior to contacting the carrier roll and is subsequently perforated in the middle of the adhesive surface.
Finally, as disclosed in European Patent Disclosure EP 0 442 038 B1, adhesive strips are laterally applied next to a perforation line. In this manner, both the perforation and the application of the adhesive strips can be performed by a single device.
In the above-noted devices, the severed edge is, as a rule, not clean. That is, between the perforation holes, the web of material is torn, which does not always result in the desired precision. Moreover, severing accomplished with the aid of a perforation can only be performed on webs up to only certain thicknesses.
In a support roll winder, in which the wound rolls, instead of resting on carrier rolls, are centrally held, e.g., as disclosed in German Patent Disclosure DE 41 15 406 A1, an adhesive strip dispenser is arranged on a traversing carriage, and a severing element in the form of a wheel is arranged to follow the dispenser. The wheel makes a cutting line in the center of the adhesive strip. However, this arrangement runs the risk that the support roller, on which the wound rolls rest, may also be damaged. Furthermore, it requires a relatively large amount of space.
SUMMARY OF THE INVENTION
The present invention provides a web winding device that includes improved results with regard to severing.
In a winding procedure as generally discussed above, the present invention provides for lifting the web of material away from the carrier roll in a severing region, and, while lifted away from the carrier roll, cutting the web all the way through.
In this way, a very clean severing line may be achieved, notwithstanding the thickness of the web of material. Even cardboard webs, e.g., can be severed in this way. A cut severing line is, as a rule, smoother and easier to manipulate than a torn severing line, even if the latter was the result of a perforation. Because the web of material is first lifted from the carrier roll in the severing region, the web of material can be cut without the fear that the carrier roll will be damaged in the process. Further, both sides of the web of material are accessible, so that there is relatively great freedom in creating the parting line.
Advantageously, a loop may be formed from the web of material in the severing region. Thus, the web of material may be lifted in the shape of an “&OHgr;” from the surface of the carrier roll, which forms a “tunnel” to be entered by the cutting device. In any event, the cutting region of the cutting device can be kept away from the surface of the carrier roll.
It may be preferred to push the web of material together in the severing region. If the flat web of material is pushed together in the severing region, in either the same or the opposite direction from the travel direction during the winding, then the loop can be formed, or the lifting of the web of material from the web of material can be obtained, entirely automatically. As a rule, no other technical provisions, such as engaging the web of material from below, are necessary.
Preferably, the severing may be performed when the wound roll is resting on two carrier rolls. That is, the severing is done while the winding bed is still closed. This may be advantageous in that the end of the web of material on the wound roll may be firmly held, specifically by the force of gravity that is operative in the nip between the wound roll and the carrier roll. Further, relatively clearly defined tension ratios, which contribute to the quality of the cut, may then obtained.
Preferably, the severing is performed in a quadrant of the carrier roll that is located above a horizontal plane through the axis of the carrier roll. Thus, the leading edge of the web of material, which afterward is to be applied to the winding tube, is already located above the plane, and is accordingly at least slightly supported from below by the carrier roll. This arrangement also makes it easier to pull the leading edge of the web of material forward after the severing has been performed.
Advantageously, the severing may be performed below a line along which the winding tube touches the carrier roll. When the winding tube is placed in the winding bed, it may still be necessary in some cases to align it with the web of material. This is especially true if the winding apparatus is to be utilized on a roll cutter that cuts a plurality of split or partial webs from one web of material. If so, the winding tubes must be brought into the proper position relative to the position of the split webs. These and other manipulations are still possible with the present invention, as long as the winding tubes (or cores) have not yet entered into an adhesive connection with the leading end of the web of material.
Preferably, the web of material may be firmly held below the cutting line before, during and after severing. The term “below” is not necessarily gravity-oriented but is meant instead to designate the leading end of the web of material that is then joined to the winding tube. In this embodiment, care is taken on both sides of the cutting line to have the web of material at a defined position, so that the cut can be made with the desired quality.
The severing is preferably performed in scissor-cut fashion, which is a high-quality cut that results in a smooth, clean severing line.
The adhesive surface may be advantageously created at a location where the web of material rests on the carrier roll. An abutment may then be available when the adhesive surface is made, so that a double-sided adhesive tape, for instance, can be readily pressed on.
In a winding apparatus of the type defined above, the apparatus
Greenblum & Bernstein P.L.C.
Jillions John M.
Voith Sulzer Papiertechnik Patent GmbH
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