Roll or roller – With antideflection means – Rotatable relative to supporting shaft
Patent
1998-01-26
1999-10-19
Cuda, Irene
Roll or roller
With antideflection means
Rotatable relative to supporting shaft
492 16, 492 20, B23P 1500
Patent
active
059679573
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention concerns a roller assembly and more particularly a roller assembly with a flexible hollow roller that is supported on its interior surface by hydraulic supporting elements.
BACKGROUND INFORMATION
Such a roller is known from European Patent 452 633 A1. In this document, no mention is made of the particularly close sequence of the individual supporting elements. Each supporting element has an actual force-exerting main bearing pocket. Bearing pockets with a considerably smaller diameter than the main bearing pocket, understood as stabilizing bearing pockets, are arranged outside the main bearing pocket, and arc supplied with hydraulic fluid through throttling ports. When such a stabilizing bearing pocket is slightly lifted from the internal perimeter of the hollow roller, the hydrostatic pressure collapses in this bearing pocket due to the throttling. This causes the edge of the bearing pocket and thus the supporting element at this point to come closer to the internal perimeter of the hollow roller, thus reducing the flow cross-section and increasing the pressure. Finally an equilibrium is achieved where the stabilizing bearing pocket is held at a certain distance from the inner perimeter of the hollow roller. With four such stabilizing bearing pockets, the entire supporting element and the main bearing pocket are always held in the correct position in relation to the inner perimeter of the hollow roller.
In the known embodiment, the main bearing pocket has a circular cross-section, whose diameter is only slightly less than the dimension of the supporting element in the longitudinal direction of the roller. Since the hollow roller is made of steel or cast iron, the cross-section of the bearing pocket presents no problem in the known embodiment.
In tests with flexible hollow rollers, such as rollers made of fiber-reinforced plastic, which may provide a particularly good fit with a mating roller, it has been established that at higher line forces, the pass line tends to dent the hollow roller and press it into the bearing pocket. Even if such denting is small, it results in pressure on the edges of the circumferential webs thus causing increased friction on the edges of the webs and increased wear.
SUMMARY AND OBJECTS OF THE INVENTION
The object of the invention is to diminish the denting of the hollow roller into the bearing pocket and thus diminish the resulting disadvantages.
This object is achieved by providing a roller having a rotating hollow roller defining a working roller periphery and an internal perimeter with a non-rotatable crosshead traversing the hollow roller longitudinally with a clearance to the internal perimeter of the hollow roller. Supporting elements having a square-shaped head part are arranged closely behind one another in a row along the crosshead and are pressed against the internal circumference of the hollow roller by the effect of a hydraulic piston/cylinder unit. The supporting elements have at least one bearing pocket on a contact surface facing the hollow roller and have a hydraulic fluid flowing over an edge of the bearing pocket forming a supporting fluid film. Stabilizing bearing pockets are arranged at the four corners of the head part and are supplied with hydraulic fluid via throttling ports. The hollow roller is made of a flexible material. The bearing pocket has a rectangular shape and is symmetrical about an axis of the piston/cylinder unit. The longer sides of the rectangular bearing pocket extend along the roller assembly, and the shorter sides of the bearing pocket at the longitudinal ends thereof, defined by webs, terminate the bearing pocket such that the outer boundaries of the shorter sides in the longitudinal direction are located on the outer boundary of the supporting element. The bearing pocket has a dimension along the roller assembly that is at least twice its dimension in the circumferential direction. The supporting elements closely follow one another along the crosshead, so that the head parts just clear one
REFERENCES:
patent: 3802044 (1974-04-01), Spillman
patent: 3997953 (1976-12-01), Christ
patent: 4228571 (1980-10-01), Biondetti
patent: 4570314 (1986-02-01), Holik
patent: 4948343 (1990-08-01), Shimizu
patent: 5286245 (1994-02-01), Schiel
patent: 5456645 (1995-10-01), Link
patent: 5846174 (1998-12-01), Autrata et al.
Cuda Irene
Eduard Kusters Maschinenfabrik GmbH & Co.
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