Winding – tensioning – or guiding – Convolute winding of material – Simultaneous winding
Patent
1997-11-24
1998-12-29
Jillions, John M.
Winding, tensioning, or guiding
Convolute winding of material
Simultaneous winding
2425416, B65H 1820, B65H 1826
Patent
active
058531394
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This application is the US national phase of PCT application PCT/EP97/01379 filed 19 Mar. 1997 with a claim to the priority of German applications 196 15 539.8 and 196 451 483.5 respectively filed 19 Apr. and 11 Dec. 1996.
FIELD OF THE INVENTION
This invention relates to a pressure-roller system for a winding machine for winding up material webs, in particular from longitudinally subdivided paper or cardboard webs. More particularly this invention relates to a pressure roller system for a winding machine for making winding rolls with a horizontally extending and vertically movable traverse on which is mounted a row of freely rotatable and individually vertically movable roller segments with axes parallel to the traverse and with means for controlling the contact pressure the roller segments bring to bear on the winding rolls and to a winding machine with a pressure-roller system according to the invention.
BACKGROUND OF THE INVENTION
In order to wind paper or cardboard webs up on winding rolls, support-roller winding machines are used that have two driven support rollers on which the winding rolls lie during winding, coaxially in line with one another. Above the roll cradle formed by the support rollers is a pressure-roller system that is formed by a throughgoing pressure roller or individual pressure-roller segments that are mounted on a horizontal vertically movable traverse. The pressure-roller system serves at the start of winding to press down on the winding rolls in order to increase the line load at the contact line between the winding rolls and the support rollers. The line load mainly determines the winding hardness of the winding rolls. At the start of winding the actual weight of the winding rolls is insufficient so that a pressure-roller system brings to bear an increased contact pressure that is decreased with increasing winding-roll weight during the winding operation.
Since variations in cross section in the web lead in winding longitudinally subdivided paper or cardboard webs to different winding-roll diameters, a throughgoing pressure roller does not contact winding rolls of smaller diameter. In order to solve this problem, a pressure-roller system is known from WO 93/15009 wherein a row of freely rotatable roller segments are mounted next to one another for independent vertical movement relative to the traverse. Each roller segments can thus be set for the diameter of the winding roll underneath itself. In order that the contact pressure created by the weight of the pressure-roller system is equal with each roller segment, the roller segments are connected to respective hydraulic piston-cylinder units that are connected together in a closed system.
In practice it has been shown that this advantageous system has problems when used with webs with thicknesses varying crosswise. Since the pressure-roller segments press independently of the winding roll diameter with the same pressure against the winding rolls, any variation in diameter between the winding rolls is ever greater. As a result of the fact that all the winding rollers are driven at the same web-travel speed (=peripheral speed of the support rollers), the result of different winding-roll diameters is a different rotational speed, that is winding rolls with smaller diameter are rotated faster. A difference in rotational speed between two adjacent winding rolls causes rubbing at their adjacent ends which leads to undesired effects such as marking, burns, and in extreme cases to loss of a roll when adjacent winding rolls with different diameter catch on each other.
OBJECT OF THE INVENTION
It is an object of the invention to provide a pressure-roller system that on the one hand maintains as uniform a contact pressure as possible on all winding rolls and on the other hand avoids negative effects caused by excessive variations in diameter.
According to the invention each roller segment has integrated into its vertical guide an element that controls the contact pressure in dependence on it
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Hehner Reinhard
Muller Georg
Peters Hans-Friedrich
Dubno Herbert
Jagenberg Papiertechnik GmbH
Jillions John M.
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