Roll or roller – With antideflection means – Rotatable relative to supporting shaft
Patent
1999-06-11
2000-04-04
Bryant, David P.
Roll or roller
With antideflection means
Rotatable relative to supporting shaft
492 20, B23P 1500
Patent
active
06045492&
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a roller corresponding to the type of the preamble of claim 1.
Such a roller is known from German Patent GM 93 14 568. In the known roller, the supporting elements rest against the inside circumference of the hollow cylinder with the edges of bearing pockets which are formed on these elements themselves. Supporting elements which are adjacent to one another in the longitudinal direction of the roller follow each other directly. The bearing pockets extend on the adjacent sides of the supporting elements which follow one another in the longitudinal direction of the roller, directly to the edge of the supporting element, so that the minimum possible distance exists between two consecutive bearing pockets. In the implementation of rollers of the type corresponding to German Patent-GM 93 14 568, it was found, however, that the hollow cylinders used, made of fiber-reinforced plastic with a wall thickness of 15 to 20 mm, can be formed in such a way that the transition points from one supporting element to the next supporting element in the longitudinal direction of the roller are distinctly marked in the line pressure progression. The hydraulic pressure in the bearing pockets drops to zero, from the value which prevails in the bearing pocket, transverse to the edge, and then increases from zero to the pressure in the next bearing pocket, at the edge of that bearing pocket. This pressure drop on the inside circumference of the hollow cylinder can still be felt on its outside circumference, because of the resilience of the hollow cylinder.
The present invention is based on the task of structuring a roller of the type of the preamble in such a way that the pressure drops at the transitions of consecutive supporting elements, in the longitudinal direction of the roller, are avoided.
This task is accomplished by the invention reproduced in claim 1.
In the following, when "top" is mentioned, this refers to the leading edge in the direction of effect of the supporting elements, which moves toward the inside circumference of the hollow cylinder when pressure is applied. This corresponds to the arrangement shown in the drawing, where the roller according to the invention is the bottom roller.
The difference as compared with the known roller is that the bearing pockets are no longer formed on each individual supporting element itself, but rather on a continuous "sealing strip" which is arranged in the longitudinal direction of the roller and carries a number of bearing pockets corresponding to the number of supporting elements, which pockets are provided at the locations of the supporting elements and extend over their longitudinal expanse.
The invention is already implemented if a continuous sealing strip with several bearing pockets extends over several consecutive supporting elements in the longitudinal direction of the roller; in the preferred exemplary embodiment, however, it is provided that the sealing strip continues over the entire length of the roller.
In the roller known from German Patent GM 93 14 568, the pressure always dropped to zero or at least to a low value at the face edge of the bearing pocket in each instance, because the edge bordered freely on the interstice between the cross-head and the inside circumference of the roller. With the arrangement of consecutive bearing pockets in the longitudinal direction of the roller on the sealing strip, however, the possibility of giving the adjacent bearing pockets in the longitudinal direction of the roller a common edge is created. On this edge, the pressure of the bearing pockets and therefore also the pressure exerted against the inside circumference of the hollow cylinder remains essentially the same, because the pressure of the bearing pockets is exerted from both sides and no pressure gradient exists. If the pressure in the bearing pockets is the same in adjacent bearing pockets in the longitudinal direction of the roller, this strictly holds true. If the pressure in the bearing pockets is slightly different, the pressure
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Brendel Bernhard
Kubik Klaus
Schrors Gunter
Bryant David P.
Butler Marc W.
Eduard Kusters Maschinenfabrik GmbH & Co K.G.
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