Winding – tensioning – or guiding – Convolute winding of material – Pressure element against coil
Reexamination Certificate
1999-09-17
2001-02-06
Walsh, Donald P. (Department: 3653)
Winding, tensioning, or guiding
Convolute winding of material
Pressure element against coil
C242S541500, C242S530100
Reexamination Certificate
active
06182919
ABSTRACT:
This application is a national stage of PCT/EP99/00559 filed Jan. 28, 1999 and based upon German national application 198 05 412.2 of Feb. 11, 1998 under the International Convention.
TECHNICAL FIELD
The invention relates to a contact roller system of a winding machine with several roller segments, arranged next to each other with their frontal sides and supported to rotate freely and to move perpendicularly with respect to their axis of rotation, and to a winding machine comprising the contact roller system for winding a running web of material, particularly a paper web or a plastic foil.
STATE OF THE ART
In winding machine which wind up running webs of material, for instance paper webs or plastic foil, it is known to use contact rollers as pressure or squeeze-off rollers, particularly at high speeds, mainly in order to prevent air from lodging in the winding roll.
If in the winding machine longitudinally subdivided webs of material are wound onto winding rolls which during winding are held by aligned winding tubes, then the contact rollers have to be individually movable for each winding roll, in order to compensate unavoidable differences in diameter. The axial length of a contact roller has thereby to be equal or bigger than the width of the winding roll against which it is pressed.
It is known to suspend contact rollers with a fixed length in individually movable bearings and to press them pneumatically against the respective winding roll. Contact rollers with fixed length can only cover a limited width area of winding rolls. When the winding width is changed outside their range, the contact rollers have to replaced with rollers having the appropriate length. Also the support locations have to be laterally displaced and positioned approximately centrally to the width of the respective winding roll. Therefore in order to operate a winding machine with very variable cutting widths, it is necessary to keep ready a large number of contact rollers. Besides each time the format is changed, the contact rollers have to be replaced and repositioned.
From German Patent 39 41 384 a winding machine with a generic contact roller system is known, wherein the roller segments as contact rollers are supported eccentrically next to each other without intervals on a support axle. As a result of the eccentric support, when commonly pressed against the winding roll each roller segment can move perpendicularly to its axis of rotation with respect to the adjacent roller segment. Furthermore through an interlocking of the roller segments, groups can be formed on the support axle. Although the individual roller segments can adjust their position in relation to the winding roll, it is not possible to press each individual roller segment against the winding roll with an individually adjusted contact pressure. This solution can not be applied in very wide machines, since the support axle lies inside the roller segments and its diameter is limited.
OBJECT OF THE INVENTION
The invention has the object to improve a generic contact roller system, so that each roller segment is individually adjustable in its position and its contact pressure, whereby the gap between two neighboring roller segments can be kept as small as possible in order to avoid marks.
SUMMARY OF THE INVENTION
This object is attained with a contact roller system for a winding machine having several roller segments arranged in succession along the winding roll and supported at their ends to rotate freely and to move perpendicular to the axis of rotation. Each roller segment is held in a respective frame for such movement and is supported by a pair of lateral support plates which extend parallel to these ends. The plates of neighboring roller segments are offset perpendicularly to this direction of movement to enable the ends of the neighboring roller segments to lie close to one another. According to the invention, narrow roller segments with individual pressure mechanisms can be arranged so close next to each other and controlled, so that together they take over the function of one contact roller with a length corresponding to the winding roll width. In the case of a format change, the contact rollers controlled by a computer can be automatically adjusted to a changed winding roll width. By arranging the support plates on top of each other the gap between two neighboring roller segments can be kept extremely small in order to avoid ring-shaped marks on the winding rolls during winding.
According to the invention, the inside of each support plate is provided with an annular groove in which the end of a respective roller segment can rotate without contact. The gap between neighboring roller segments is smaller than 5 mm and preferably ranges between 0.8 and 3 mm.
Each roller segment is supported by the respective frame on a cross bar which is common to all of the frames and roller segments and has a respective drive for moving the frame relative to the cross bar. Means can be provided for coupling neighboring roller segments to one another mechanically in order to form an inherently rigid roller. The axial clear space between the end of a roller segment and the rear wall of a respective annular groove can amount to 0.2 mm up to 5 mm, preferably approximately 3 mm.
The cross bar with the roller segments carried thereby can be set by a transverse motion to lie parallel to the rotation axis of the roller segments. The web which is wound up with the machine of the invention is preferably a paper web or plastic foil and the contact roller system is so constructed that the web running to the winding roll wraps around a roller segment through an angle of 50 to 30°.
REFERENCES:
patent: 3648342 (1972-03-01), Dorfel
patent: 4095755 (1978-06-01), Snygg et al.
patent: 4472155 (1984-09-01), Greding
patent: 4669646 (1987-06-01), Oinonen
patent: 5785271 (1998-07-01), Leskinen et al.
patent: 5806783 (1998-09-01), Turunen
patent: 26 32 608 (1977-02-01), None
patent: 39 41 384 C1 (1991-06-01), None
patent: 196 51 483 A1 (1997-10-01), None
patent: 60-148861 (1985-06-01), None
Fisher Uwe
Hutzenlaub Armin
Dubno Herbert
Kampf GmbH & Co. Maschinenfabrik
Rivera William A.
Walsh Donald P.
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