Source: http://www.google.com/patents/US4233011?dq=oakley+D523,461&ei=qiI4T-CjGqXf0QHz_PSUCA
Timestamp: 2016-05-01 22:39:02
Document Index: 694067914

Matched Legal Cases: ['art 1', 'art 1', 'art 3', 'art 1', 'art 1', 'art 3']

Patent US4233011 - Rolls of controllable flexure, especially for machines for the production ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA 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...http://www.google.com/patents/US4233011?utm_source=gb-gplus-sharePatent US4233011 - Rolls of controllable flexure, especially for machines for the production and processing of webs of paper or plasticAdvanced Patent SearchPublication numberUS4233011 APublication typeGrantApplication numberUS 06/069,660Publication dateNov 11, 1980Filing dateAug 24, 1979Priority dateAug 31, 1978Also published asCA1125076A, CA1125076A1, DE2837913A1, DE2837913C2, EP0008814A1, EP0008814B1Publication number06069660, 069660, US 4233011 A, US 4233011A, US-A-4233011, US4233011 A, US4233011AInventorsWalter Bolender, Ernst WallnerOriginal AssigneeEr-We-Pa Maschinenfabrik & EisengiessereiExport CitationBiBTeX, EndNote, RefManPatent Citations (10), Referenced by (76), Classifications (21) External Links: USPTO, USPTO Assignment, EspacenetRolls of controllable flexure, especially for machines for the production and processing of webs of paper or plastic
US 4233011 AAbstract
1. 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� 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.
The invention sets out from a roll having a substantially cylindrical inner part and a tubular outer part which extends over a portion of the length of the inner part, surrounding the latter and mounted at both of its ends on the inner part for rotation about the cylinder axis, in which a system for the production of compulsive forces acting radially between the inner part and the outer part is disposed along a generatrix on the inner part. The solution of the problem set forth above is accomplished in accordance with the invention by the fact that a heating strip composed of one or more sections which can be connected to an electrical heating circuit is disposed on the inner part and extends at least over a portion of the length of the inner part and over a given portion of the circumference thereof that is smaller than 180�, and that in the inner part there are disposed at least two electrical temperature sensors, of which at least one first temperature sensor is directly adjacent the heating band or section thereof and at least one second temperature sensor is on the diametrically opposite side of the inner part, and that the first and second temperature sensors are connected in pairs to an apparatus for measuring the temperature difference, and at least one electrical regulating circuit is provided to which the apparatus for measuring the temperature difference or differences and the heating power circuit or circuits are connected, and which regulates the heating of the heating strip or sections thereof such that a given temperature difference or given temperature differences are maintained between the heated and the unheated side of the inner part.
On the upper side, in the figures, of the inner part 1, heating strip sections 6a to 6f are disposed longitudinally between adjacent pairs of the roller bearings 4a to 4g. As seen in FIG. 2, these heating strip sections have a width corresponding to approximately 90� of the circumference of the inner part. The heating strip sections are each connected to electrical heating power circuits 15 by conductors 10, of which only one is represented for the sake of simplicity. Each such power circuit 15 is associated with two of the heating strip sections. Thus, the heating strip sections 6a and 6b create a heating zone Z1, heating strips 6c and 6d a heating zone Z2 and heating strips 6e and 6f a heating zone Z3. The electrical conductors of the power circuits are carried within the inner part 1 and emerge through bores 1a.
In operation, the roll represented in FIGS. 1 and 2 is held fixedly at the journals 2a and 2b, so that the outer part 3 is rotatable about the stationary inside part 1. The roll can, for example, be mounted in the position represented in FIGS. 1 and 2 on a paper machine, so that the heating strips are on the top of the inside part while the bottom of the inside part is cooled. The weight of the roll causes it at first to sag. In the case of a concrete example of a roll for a web width of 3600 mm designed for a nip pressure of 117.7 N/mm, the sag in the center of the roll amounts to approximately 1.6 millimeters. To achieve a uniform nip pressure, this sag has to be compensated. A certain temperature difference between the temperature sensors 7a and 7a, 7b and 8b, 7c and 8c, is preset in the regulators 14. Through the power circuits 15 the heating strips 6a to 6f are heated until the preset temperature differences are reached. The necessary temperature differences must be determined in advance by appropriate experiment or calculation. The unilateral heating of the inner part 1, causes it to arch on the side that is heated, and this arching is transmitted through the roller bearings 4a to 4g to the outside part 3. By this arching the sag is compensated, and it has been found that, in the case of the sag cited above, a temperature difference of 33.6� C. between the top side and the bottom side of the inner part is necessary in order to compensate the natural sag and assure a uniform contact pressure for the roll. If the temperature difference is greater, the top side of the roll will arch to a still greater degree.
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