Roll or roller – With antideflection means – Rotatable relative to supporting shaft
Patent
1996-09-24
1998-09-29
Cuda, Irene
Roll or roller
With antideflection means
Rotatable relative to supporting shaft
492 16, 492 50, 492 56, B23P 1500
Patent
active
058139591
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a roller for applying pressure to a strip of paper, textile, plastic film, sheet metal, or other similar material.
BACKGROUND OF THE INVENTION
Such a roller is known from WO 92/13787, for a special application case. The known roller is a deflection-controlled pressure roller for a film winder, which has a hollow roller made of a fiber-reinforced plastic with an oil-resistant and/or water-proof protective layer on the inside circumference and a coating of elastomer material on the outside circumference. No details of the design are described.
OBJECTS AND SUMMARY OF THE INVENTION
The present invention is based on the task of developing a roller according to this type further, in such a way that it allows the greatest possible adaptation of the line pressure profile for pressure treatment of material in continuous strips.
This task is accomplished by a roller comprising a rotatable hollow roller having an inside circumference and an outside working roller circumference. The hollow roller comprises fiber-reinforced synthetic resin material, and extends along a longitudinal direction. The roller also includes a cross-beam extending through the hollow roller in the longitudinal direction such that there is radial spacing between the cross-beam and the inside circumference of the hollow roller around the cross-beam. The cross-beam includes ends non-rotatably mounted in external supports. The roller also includes a plurality of hydrostatic support elements arranged in one or more longitudinal rows on the cross-beam. The elements are arranged on a side of the cross-beam on which pressure is exerted by the roller on the strip. The elements are pressable against the inside circumference of the hollow roller by means of hydraulic fluid. The elements each have a contact surface pressable against the inside circumference of the hollow roller. The contact surface includes open bearing pockets defined by edges, which pockets are fillable with hydraulic fluid for supporting the hollow roller. The pockets are adapted to enable the hydraulic fluid to flow over the edges of the pockets to form a liquid film supporting the hollow roller. The support elements have a length not exceeding 20 cm in the longitudinal direction of the hollow roller. The elements are closely arranged with respect to each other in the longitudinal direction, and are controllable independently of one another. Forming the hollow roller out of fiber-reinforced plastic makes it possible to make the hollow roller particularly easy to bend in a plane which passes through its axis, so that the forces applied on the inside by the support elements "strike through" on the outside circumference of the roller, in a line force profile which approximates the force profile as much as possible. Usually, the hollow rollers of deflection-controlled rollers consist of a steel pipe with a wall thickness of 30-100 mm. This steel pipe has a significant inherent stiffness, which extensively equalizes any force profile applied on the inside. Regardless of the desired flexibility of the hollow roller in the plane which passes through its longitudinal axis, its shape stability in the circumference direction should still be such that perfect travel of the hollow roller, without any significant deviation from the circular cross-sectional shape, is still guaranteed. This means that a flexible hose would not be a possibility for use as a hollow roller. Instead, the shape rigidity should be such that the material maintains its pipe shape in the force-free state, and does not already flatten to any noteworthy extent under its own weight, for example.
The reduced bending rigidity in the plane which passes through the axis requires practically continuous support along the roller nip, otherwise a wave-shaped line force distribution will occur in the roller nip, resulting in a drop in line force between the support zones, because of corresponding deflection of the hollow roller. For this reason, the reduction in bending rigid
REFERENCES:
patent: 3119324 (1964-01-01), Justus
patent: 3157110 (1964-11-01), Goddard
patent: 4327467 (1982-05-01), Quaint
patent: 5393290 (1995-02-01), Lehmann et al.
patent: 5655444 (1997-08-01), Kayser et al.
"Leichtlaufrollen aus Faserverbundwerkstoffen" (Rollers Made of Composite Fiber Materials)--Freudenberg.
Hader Peter
Kubik Klaus
Cuda Irene
Eduard Kusters Maschinenfabrik GmbH & Co. KG
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