US 4,376,330 A · Flexure-resistant calender roll

Abstract

A calender roll has a hollow cylinder which surrounds or is surrounded by a stationary support. That surface of the support which faces the cylinder has circumferential and axially parallel grooves for the coils of electromagnets which are energizable independently of each other or simultaneously and serve to prevent flexing and/or other deformation of the cylinder when the latter rotates and contacts a running web of paper, textile material or metallic or plastic foil. Those sections of the aforementioned surface of the stationary support which are surrounded by the coils constitute portions of circumferentially extending arcuate or annular pole faces and the polarity of each circumferentially extending pole face is constant. However, the polarities of neighboring pole faces the different, i.e., pole faces which constitute south and north poles alternate with each other, as considered in the axial direction of the calender roll. The cylinder can be subjected to controlled heating action by splitting the circumferentially extending pole faces, by connecting some or all of the coils to sources of a-c current, by varying the extent of excitation of the coils and/or by a combination of two or more of these methods.

Claims30

Dependent claims

The combination comprising:

(a) a pair of components including a stationary component and a rotary component, one of said components surrounding at least a portion of the other of said components;
(b) magnet means on a selected component of said pair and operative to generate electromagnetic forces when direct current is supplied thereto, said magnet means including a plurality of pole faces arranged next to one another in axial direction of said selected component, and each of said pole faces comprising a plurality of sections extending in circumferential direction of said rotary component, each of said pole faces substantially entirely circumscribing said selected component and having a single polarity, and said pole faces being arranged such that neighboring pole faces have different polarities;
and
(c) supply means for supplying direct current to said magnet means, said supply means being arranged so that one section of each of said pole faces is excitable independently of the remainder of the respective pole face.

1 more element

Dependencies are inferred from the claim text.

Flexure-resistant calender roll

Life of this patent

Flexure-resistant calender roll

Life of this patent

Abstract

Claims30