US 4,233,011 AGranted

Rolls of controllable flexure, especially for machines for the production and processing of webs of paper or plastic

AssigneeER-WE-PA Maschinenfabrik & Eisengiesserei

InventorsWalter Bolender, Ernst Wallner

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Abstract

A roll of controllable flexure having a cylindrical inner part and a tubular outer part surrounding the inner part and mounted rotatably at both its ends on the inner part. A heating strip is disposed along a generatrix on the inner part. At least one electrical temperature sensor is disposed in the inner part in the immediate vicinity of the heating strip and at least one additional electrical temperature sensor is disposed on the opposite side of the inner part. The two temperature sensors are connected to a temperature difference measuring apparatus and control an electrical regulating circuit to which a power circuit containing the heating strip is connected. The power delivered to the heating strip is so regulated that a preset temperature difference between the heated and unheated sides of the inner part is maintained. The different thermal elongation of the unheated and heated sides of the inner part produces an arching of the inner part which is transmitted to the outer part. The side of the inner part that faces away from the heating strip can be cooled.

Claims11

Dependent claims

A roll having controllable flexure comprising:

a substantially cylindrical inner element;
a tubular outer member configured to extend over a portion of the length of the inner member and surrounding same;
means mounting the outer member on the inner member for rotation about the cylindrical axis of the inner member;
and means for producing forces acting radially between the inner member and outer member along a generatrix comprising at least one electrically powered heating element disposed on the inner element and extending over at least a portion of the axial length of the inner element and over a given circumferential area that is smaller than 180.degree. to produce a temperature differential therein and a corresponding flexure in response thereto, at least one means for sensing the temperature difference between the portion of the inner member at said at least one heating element and the portion of the inner member diametrically opposite thereto and means for regulating the temperature differential at a selected value for said at least one heating element to obtain a corresponding degree of flexure of the inner member and thereby the outer member.

1 more element

Dependencies are inferred from the claim text.