|Publication number||US2592581 A|
|Publication date||Apr 15, 1952|
|Filing date||Jan 13, 1950|
|Priority date||Jan 13, 1950|
|Publication number||US 2592581 A, US 2592581A, US-A-2592581, US2592581 A, US2592581A|
|Inventors||Edwin T Lorig|
|Original Assignee||United States Steel Corp|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (7), Referenced by (62), Classifications (21)|
|External Links: USPTO, USPTO Assignment, Espacenet|
April 15, 1952 E. 'r. LORIG METHOD AND APPARATUS FOR POSITIONING STRIP Filed Jan. 13, 1950 I 5 Sheets-Sheet 1 INVENTOR EDWIN T. LORIG ATTORNEY April 15, 1952 E. r. LORIG 2,592,581
METHOD AND APPARATUS FOR POSITIONING STRIP 3O :E lE;5 :EILEI E INVENTOR EDWIN T. LORIG ATTORNEY April 5 952 E, T. LORIG 2,592,581
METHOD AND APPARATUS FOR POSITIONING STRIP Filed Jan. 13, 1950 5 Sheets-Sheet 3 ATTORNEY Patented Apr. 15, 1952 METHOD AND APPARATUS FOR POSITIONING STRIP Edwin T. Lorig, Ross Township, Allegheny County, Pa., assignor to United States Steel Company, a corporation of New Jersey Application January 13, 1950, Serial No. 138,389
This invention relates to a method of and apparatus for automatically centering and aligning moving objects, especially strip and striplike materials. In the processing of metal strip, the strip is conveyed over rolls in the uncoiled condition. When the strip is conveyed over a roll to the processing equipment it is likely that the strip will be fed at a slight angle to the roll. Because of this, the strip will work its way across the face of the roll. In addition, the camber and/or lateral curvature which is present in the finished strip due to rolling difiiculties causes the strip to approach the roll at an angle, this also causing the strip to move across the face of the roll. In order to keep the strip in the desired path of travel, various expedients have been resorted to. One of the most common is the use of stationary or rotatable side guides against which the edges of the strip bear. In some instances side guides have been used in conjunction with looper pits to force the strip back on the desired center line. The use of abnormally high strip tension has been tried in an attempt to keep the strip aligned. Another method of operation is to periodically slip or slue the strip back into its approximate proper position on the conveying roll. All of the above methods of centering strip tend to abrade and mutilate the strip edges and in some instances cause the edges of the strip to be stretched beyond the elastic limit of the metal. Diagonal or lateral surface scratches are also formed on finely finished fiat products of all kinds, these scratches being detrimental to subsequent operations and together with edge damage result in the scrapping of a large percentage of the material being processed. The problems discussed above also exist in belt conveyors and drive belts used in conjunction with belt pulleys. If the belt is made of rubber or other relatively soft material, it is more easily damaged. In addition to the methods of aligning strip mentioned above, crown rolls have been used to center materials having a low modulus of elasticity such as textiles, rubber and composition belts.
One type of apparatus for centering and aligning strip is shown in my copending application Serial No. 97,218, filed June 4, 1949.
It is an object of the present invention to provide apparatus for automatically centering moving objects without damage thereto.
Another object is to provide such apparatus which does not depend upon contact with the edge of the strip or abnormal tensioning of the strip to keep the strip in center alignment.
A further object is to provide a method of keeping the longitudinal axis of a moving strip in a constant vertical plane.
These and other objects will be more apparent after referring to the following description and attached drawings, in which:
Figure l is a sectional view of one specific embodiment of my device;
Figure 2 is a sectional view taken on the line II-II of Figure 1;
Figure 3 is a fragmentary view, similar to Figure 1. showing a slight modification of my device;
Figure 4. is a sectional view showing another modification;
Figure 5 is a sectional view showing a further modification;
Figure 6 is a sectional view taken on line VI- VI of Figure 5;
Figure '7 is a view, partly in section, of still another modification;
Figure 8 is a sectional view taken on line VIII-V111 of Figure 7;
Figure 9 is a sectional view of a pair of pinch rolls embodying my invention; and
Figure 10 is an end elevation of the rolls of Figure 9.
Referring more particularly to Figures 1 and 2 of the drawings, the reference numeral 2 indicates a rotatable roll over which a strip or striplike material S, such as a conveyor belt, passes. The roll is provided with a plurality of flexible projections 4 and 6 which are inclined radially downward toward the axis of the roll away from the transverse center of the roll. The roll 2 has a shaft 8 on which is mounted a sleeve It] made of rubber, neoprene, leather, fabric, or other resilient material. The projections 4 and 6 are provided on the sleeve H) by means of slots I2 which extend circumferentially around the periphery of the roll. If it is desired to have a smooth surface on the periphery of the roll, the slots l2 may be filled with a material I4, such as sponge rubber, having a much greater elasticity than the projections. The roll may be cylindrical, concave or convex as desired to suit various installations. The projections 4 and 6 preferably are arranged at an angle between 45 and to the axis of the roll. The roll shaft 8 is supported by means of bearings l6 arranged in housing I8. If it is desired to drive the roll, an extension 20 can be provided at one end of the shaft 8. A thrust ring 22 is provided between each end of the sleeve Ill and the adjacent bearing I6. When the strip S passes over the roll surface it bends the projections 4 and 6 inwardly toward the center of the roll as shown in Figure 1. As long as the strip is centered on the roll and the bearing pressure of the strip on the roll is uniform over its full width, no lateral movement of the strip will occur when it is conveyed over the roll. If, however, the strip is off-center or the strip contact pressure is nonuniformffromside to .side, the projections 4 .or .6 having the greatest total area in contact with the strip and the greatest total pressure will force the strip toward the center. In other words, as shown in Figure 1, if more of thestripis ,to the right of the transverse center line of the roll, the projections 6 will have a greater area in contact with the strip and will forcethestrip :totheleft until the strip centers itself. In certain'applioations there will be only line contact between the roll and the objects passing thereover. Inother instances, such as shown in Figure 2, the strip S may lead onto the centering roll at pointl-24 and leave the roll at point 26. The roll may be either -aidr-iven oranidlerrroll and'P2 is :greater thanPl. In this example, the :pressure of the strip S against 'therol'l surface will gradually increase between zjpoint 2 4 and a point F2 8 and :decrease between points 28 and: 2'6. .The shape-ofithe groove in thesrolls sis-immaterial as-long :as the projections 4 and 6 are inclined-as:setforthabove.
Figure 4- shows a .second; embodiment of my invention in which the roll is made up of a plurality .of resilient discs 3.0;mounted on :a threaded shaft .32. :The discsfisiicmayibemade of the same material as sleeve H) or they may be made from metalii .theyuare sufiicientlyfiexible to bend under pressure. The discs 36 are inclined radially I "away-fromthe2shaft32 toward the center line of the roll. Spacers 33 are provided between the disos -withta centericlip or none 34 :being provided on the transverse center of the roll between the -two centeridiscs. An 'end clip 36 on each end of the shaft is held against the end discs .39 by meansofa nut '38 which is threaded on the shaft 32, thus holding the discs-39 in assembled .position.
Figures 5 and 6 showxanother embodiment of my invention:in which the projections 4 and (Bare knobs 40 arranged in spaced apart relationship both longitudinally and circumferentially of the roll. The knobs 49 are formed in a sleeve 42 --mountedon a shaft.
Figures '7 and 8 show a further modification in which the projections 4 and 6 are formed by pro- "-viding holes 46 in the outer periphery of the roll. 'T-hese "holes extend radially downwardly toward the axis'of the roll away from the transverse center of the roll.
In eachtof' the embodiments, the space between the projections-may be'filled with sponge rubber or'other highly'elastic material in the same mannerzas shown in Figure-3. Also, if desired, the outenperiphery of the rolls may be grooved longitudinally'tosecure greater resilience on the surface. v:"Ihis is shown at 48 in Figures '7 and 8. In
allpinstances,thefunctioning of the roll i the psarnezasthat described for'Figure 1.
It will be .nnderstoodthat. the term transversecenter line asnsedin'the claims of the specification is not rlimitedto. the exact geometrical center of the roll 'sincethe functioning of theroll will be the same regardless of whether there are a greater number of'projections 4:01 a greater number of projectionsfi. In each instance, the strip S will be centered at. a. point between the projections 4 and 6.
.In some instances it may be desired to transfer theobject being conveyed across the surfac of :thezrolland discharge it from one end thereof.
projections 4 and 6 are mounted .on a resilient member 50, which is provided with an'air pocket 52 therein. The member 50 is mounted on a shaft 54 and, if desired, rigid rims 56 may b provided on .the shaft 54 one on each side of the sleeve :50. This construction, which is particularly adapted for pinch rolls, enables the contact :distance 58 between the rolls to be increased, thus assisting in holding the strip S in alignment 'while rotating 'the'rolls.
While several embodiments of my invention have been shown and described, it will be apparent that other adaptations and modifications may be made without departing from the scope .of thefollowing claims.
1. Apparatus for automatically centering a moving object comprising a rotatable roll over which the object passes, said .roll having a plurality of flexible projections on its outer periphery arranged on both sides of a transverse central plane, said projections being undercut and inclined radially toward the axis of the roll away from the said transverse central plane.
2. Apparatus for automatically centering a moving object according to claim 1 in which the projections are formed by :meansof slots "extending .circumferentially around the periphery of'the. roll.
13. Apparatus .for automatically centering a moving object according to claim 1 in which the projections are formed by means of a rollshaft, resilient discs-mounted in'spaced apart relationship on said shaft, said :discs being inclined radially away from said shaft toward .thesaid transverse centralplane, and'means for holding said discs .on said shaft.
4. Apparatus for automatically centering a movingobje'ctaccording to claim 1 in which the projections are formedu'by means of a roll shaft,
resilient discs mounted in spaced apart relationshipon said shaft, said .discsbeing inclined radially away from said shaft toward the said transverse'central plane, spacers on said shaft between the discs, 'anend clip on eachen'd of the shaft bearing against the end discs, and mean for holding said end clips firmly against the end discs.
5. Apparatus for automatically centering a moving object according to claim 1 in which the projections are formed by means of holes extending from the outer'periphery of the roll radially toward the 'axis'of' the roll'away from the said transverse central plane.
inclined radially toward the axisof the roll away from the said transverse central plane, the space 75 between the projections being filled with a mate- 5 rial having much greater elasticity than the projections.
8. Apparatus for automatically centering a moving object according to claim 7 in which the projections are formed by means of slots extending circumferentially around the periphery of the roll.
9. Apparatus for automatically centering a moving object according to claim 7 in which the projections are formed by means of a roll shaft, resilient discs mounted in spaced apart relationship on said shaft, said discs being inclined radially away from said shaft toward the said transverse central plane, and means for holding said discs on said shaft.
10. Apparatus for automatically centering a moving object according to claim 7 in which the projections are formed by means of a roll shaft, resilient discs mounted in spaced apart relationship on said shaft, said discs being inclined radially away from said shaft toward the said transverse central plane, spacers on said shaft between the discs, an end clip on each end of the shaft bearing against the end discs, and means for holding said end clips firmly against the end discs.
11. Apparatus for automatically centering a moving object according to claim 7 in which the projections are formed by means of holes extending from the outer periphery of the roll radially toward the axis of the roll and away from the said transverse central plane.
12. Apparatus for automatically centering a moving object according to claim 7 in which the roll comprises a shaft, and a resilient member having an air pocket therein mounted on said shaft, said projections being supported on said resilient member.
13. A method of keeping the longitudinal axis of a moving strip in a constant vertical plane which comprises pulling the strip over a roll having a plurality of flexible undercut projections on its outer periphery inclined radially toward the axis of the roll away from the said vertical plane, and applying sufiicient tension to the strip to deflect the projection in contact therewith toward the axis of the roll.
EDWIN T. LORIG.
REFERENCES CITED The following references are of record in the file of this patent:
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|U.S. Classification||226/3, 193/37, 198/785, 226/192, 474/187, 474/189, 425/DIG.400, 210/DIG.300, 156/405.1|
|International Classification||B65H23/02, B65H27/00|
|Cooperative Classification||Y10S210/03, B65H2404/1122, B65H27/00, B65H23/02, B65H2404/13162, B65H2404/185, Y10S425/04, B65H2404/164|
|European Classification||B65H23/02, B65H27/00|