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Publication numberUS3743152 A
Publication typeGrant
Publication dateJul 3, 1973
Filing dateJul 14, 1972
Priority dateJul 16, 1971
Publication numberUS 3743152 A, US 3743152A, US-A-3743152, US3743152 A, US3743152A
InventorsGreeves T
Original AssigneeCadbury Ltd
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Mechanism for correcting any tendency for a moving web to deviate from a required path
US 3743152 A
Abstract
Mechanism for correcting any tendency for a moving web such, for example, as a strip of material being wound onto, or unwound from a roller, or an endless belt to deviate from a required path. The mechanism includes a rotatable roller around the periphery of which the web passes so as to be in frictional contact therewith through a predetermined arc. The periphery of the roller is in part constituted by a plurality of angularly spaced bars which are slidable longitudinally in a direction parallel to the axis of the rotation of the roller. At opposite ends of the roller respectively are a pair of relatively fixed cams for ensuring that the bars take up a predetermined longitudinal position whilst they move through the arc in which they are in frictional contact with the web. Means is provided for sensing any deviation of the web from its required path as it approaches the roller and a second pair of cams at opposite ends of the roller respectively are movable by said means to displace the bars longitudinally by an amount determined by said means whilst the bars are moving through the arc in which they are not in contact with the web.
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Description  (OCR text may contain errors)

United States Patent 1191 Greeves July 3, 1973 Primary Examiner-Allen N. Knowles Attorney-John C. Holman, Herbert Cantor et al.

[75] Inventor: Thomas William Greeves, [5 7] ABSTRACT B'rmmgham England Mechanism for correcting any tendency for a moving [73] Assignee: Cadbury Limited, Birmingham, web such, for example, as a strip of material being England wound onto, or unwound from a roller, or an endless belt to deviate from a re uired path. The mechanism [22] Ffled' July 1972 includes a rotatable rollgr around the periphery of [21] Appl. No.: 271,653 which the web passes so as to be in frictional contact therewith through a predetermined arc. The periphery of the roller is in part constituted b a plurality of angu- [301 Foreign Apphcauon P riomy Data larly spaced bars which are slidabl e longitudinally in a July 16, 1971 Great Britam 33,502/71 direction parallel to the axis of the rotation of the roller. At opposite ends of the roller respectively are a [52] U.S. Cl. 226/19, 226/23 pair of relatively fixed cams for ensuring that the bars [51] III. C] B65I1 25/26 take up a predetermined longitudinal position whflst [58] Field Of Search 226/19, 23, 22, 190, they move through the arc in which they are in fric 226/199 tional contact with the web. Means is provided for sens ing any deviation of the web from its required path as [56] References C'ted it approaches the roller and a second pair of cams at UNITED STATES PATENTS opposite ends of the roller respectively are movable by 3,069,921 12/1962 Davis 226/19 x said m n to displace the bars ng n lly y n 3,052,395 9/1962 Scott 226/19 X amount determined by said means whilst the bars are 3,095,131 1 63 Robe so et a 26/ 19 X moving through the arc in which they are not in contact 3,637,122 1/1972 Tokunage 226/19 i h h b 2,752,151 6/1956 Levine 226/20 4 Claims, 4 Drawing Figures H 4 m 10 FT], l2 l3 n ]4 H A L l T l 1 9 XX t 1 g a a a a 197 e PATENTEDJUL 3 I975 SHEET 2 [IF 2 'FIG.2

FIG.3

MECHANISM FOR CORRECTING ANY TENDENCY FOR A MOVING WEB TO DEVIATE FROM A REQUIRED PATH This invention relates to mechanism for correcting any tendency for a moving web such, for example, as a strip of material being wound onto, or unwound from a roll, or an endless belt to deviate from a required path.

The object of the invention is to provide such mechanism in a simple and convenient form.

Mechanism according to the invention comprises in combination a rotatable roller around the periphery of which the web passes so as to be in frictional contact therewith throughout a predetermined arc, the periphery of said roller being in part constituted by a plurality of angularly spaced bars which are slidable longitudinally in a direction parallel to the axis of rotation of the roller, relatively fixed cams at opposite ends of the roller respectively for ensuring that the bars take up a predetermined longitudinal position whilst moving through the arc in which they are in frictional contact with the web, means for sensing any deviation of the web from its required path as it approaches said roller, and further cams at opposite ends of the roller respectively, said further cams being movable by said means to displace the bars longitudinally by an amount determined by said means during their movement through The are in which they are not in contact with the web.

In the drawings,

FIG. 1 is a sectional end view of an example of the invention,

FIG. 2 is a section on the line AA of FIG. 1,

FIG. 3 is a section on the line BB of FIG. 1, and

FIG. 4 is an end view of the correcting mechanism with the roller removed.

Referring to the drawings, there is provided a rotatable roller which is journalled within bearings 11 and around the periphery of which a web 12 passes. In the illustrated example the web 12 is in frictional contact with the periphery of the roller 10 throughout an arc subtending approximately 180, whilst the other approximately 180 arc of the roller is free of the web. The periphery of the roller 10 is in part constituted by a plurality of equi-angularly spaced bars 13 which are longitudinally slidable in a direction parallel to the axis of rotation of the roller 10.

At opposite ends of the roller 10 respectively are a pair of relatively fixed cams 14 which are arranged to make contact with the ends of the bars 13 and ensure that the bars take up a predetermined longitudinal setting during their movement through the arc in which they are in contact with the web. Since in practice the bars 13 will deviate from their predetermined position by only a small amount as will be described, portions of the surfaces of the earns 14 are constituted by the peripheries of rotatable rollers 14 at the point which will be subjected to maximum use.

There are also provided at opposite ends of the roller 10 respectively a pair of movable cams 15 which are carried by a member 16 which is pivotally connected by a pair of parallel links 17 to the base 18 carrying the bearings 11, so as to be movable transversely relative to the direction of travel of the web 12. The member 16 carries a pair of upstanding brackets 19 which are slotted to receive respectively the opposite marginal edges of the web 12.

The cams 15 are positioned to make contact with opposite ends of the bars 13 respectively as the bars 13 move through the arc in which they are not in contact with the web 12.

In operation, any deviation of the web 12 laterally from its predetermined path as it approaches the roller 10 will cause displacement of the member 16 and therefore set the earns 15 to a position to displace the bars 13 longitudinally from the position in which they have been set by an amount dependent upon the degree of deviation of the web. As a result these bars will be in a displaced position when they first make contact with the web 12. As the bars move through The are in which they are in contact with the web, they will be returned by the fixed earns 14 to the predetermined position thereby returning the web laterally to its required path. As a result the web leaving the roller 10 should be accurately positioned.

In order to enable the degree of correction for a given deviation of the web to be varied the brackets 19 are preferably adjustable in a direction at right angles to the member 16 and perpendicular to the plane of the paper as viewed in FIG. 4.

It will be appreciated that it is not necessary for the web 12 to be in contact with the roller 10 through an are as large as 180, since an arc of or even less will give sufficient time for the movement of the bars 13 to correct any deviation of the web from its predetermined course. However, in order to maximise the friction between the web and the bars 13 the contacting surfaces of the latter may be knurled or coated with an abrasive material.

I claim:

1. Mechanism for correcting any tendency for a moving web to deviate from a required path comprising in combination a rotatable roller around the periphery of which the web passes so as to be in frictional contact therewith throughout a predetermined arc, the periphery of said roller being in part constituted by a plurality of angularly spaced bars which are slidable longitudinally in a direction parallel to the axis of rotation of the roller, a pair of relatively fixed cams at opposite ends of the roller respectively for ensuring that the bars take up a predetermined longitudinal position whilst moving through the arc in which they are in frictional contact with the web, means for sensing any deviation of the web from its required path as it approaches said roller, and a second pair of cams at opposite ends of the roller respectively, said second pair of cams being movable by said means to displace the bars longitudinally by an amount determined by said means during their movement through the arc in which they are not in contact with the web.

2. Mechanism for correcting any tendency for a moving web to deviate from a required path as claimed in claim 1 in which the means for sensing any deviation of the web from its required path comprises a pair of brackets engaging opposite marginal edges of the web, a member displaceable laterally of the web to which the pair of brackets and the second pair of cams are connected.

3. Mechanism for correcting any tendency for a moving web to deviate from a required path as claimed in claim 2 in which the brackets are adjustable in a direction at right angles to the member to enable the degree of correction for a given deviation of the web to be varied.

4. Mechanism for correcting any tendency for a mov ing web to deviate from a required path as claimed in claim 3 in which portions of the operative surfaces of 'the' pair of relatively fixed cams are constituted by the peripheries of rotatable rollersl

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2752151 *Sep 3, 1953Jun 26, 1956Levine PaulCloth-guiding devices
US3052395 *Apr 21, 1960Sep 4, 1962Perkin Elmer CorpRollers
US3069921 *Mar 10, 1961Dec 25, 1962Eimco CorpWeb control means
US3095131 *Jul 6, 1959Jun 25, 1963Mount Hope Machinery LtdWeb guiding method and apparatus
US3637122 *May 21, 1970Jan 25, 1972Fukui Seiren Kako KkDevice for controlling feeding position of fabric
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4785514 *Oct 7, 1987Nov 22, 1988Hh&L Co.Oscillating roller mounted on a fixed shaft
US5087313 *Oct 6, 1989Feb 11, 1992Arc Machinary CorporationPaper web alignment system
US5549510 *Mar 12, 1993Aug 27, 1996Mitsuboshi Belting Ltd.Endless power transmission belt processing apparatus, a grinding wheel therefor, and a method of using the endless power transmission belt processing apparatus
US6286663Mar 31, 1999Sep 11, 2001Bucher-Guyer AgConveyor device
US6830212Nov 9, 1999Dec 14, 2004Jack C. HarrisWeb tension equalizing roll and tracking apparatus
US7300371May 27, 2004Nov 27, 20073M Innovative Properties CompanyApparatus for deflecting or inverting moving webs
DE19816466A1 *Apr 14, 1998Oct 21, 1999Bucher Guyer Ag MaschFördereinrichtung
EP0038207A2 *Apr 14, 1981Oct 21, 1981Xerox CorporationApparatus for controlling the lateral alignment of a belt and electrostatographic printing machines and document handlers incorporating same
EP0488688A2 *Nov 27, 1991Jun 3, 1992Mitsuboshi Belting Ltd.Endless belt deviation preventing unit and belt processing apparatus employing the same unit
WO1999052801A1Mar 31, 1999Oct 21, 1999Bucher Guyer AgTransportation device
WO2001034506A1 *Nov 9, 2000May 17, 2001Equaliner Systems LlcWeb tension equalizing roll and tracking apparatus
Classifications
U.S. Classification226/19, 226/23
International ClassificationB65H23/032, B65H23/02, B65H23/038
Cooperative ClassificationB65H23/038, B65H23/02
European ClassificationB65H23/038, B65H23/02