US210097A

US210097A - Improvement in felt-stretchers for paper-machines

Info

Publication number: US210097A
Authority: US
Publication date: 1878-11-19
Anticipated expiration: 1895-11-19

Description

.2vS`heets--Sheet I.

0. W. CLARK.. l 'Felt-St'retohers fdr Paper-Machines.

Patented Nov. 19,1878.-

lNvENToR l v .PETERS. FHOTO-LFI'HDGRAPHER. WASHINGTON. D( CY Y l 2.Shet.s-Sh'eet;l 2. CLARK.' for Paper-Machines.

s T. e h c t e .P.. Llu S. Mw nu F Il 2 o. N

UNITED STATES. PATENT Gitaren.'-

oRsoN w. CLARK, or APIJLnroN, WISCONSIN.

IMPROVEMENT IN FELT-STRETCHERS FOR PAPER-MAQHINES.

Specification forming part of Letters Patent No. 210,097, dated November 19, 1878; application iiled August 10, 1878.

To all whom 'it may concern:

Be it known that I, ORSON WILLLAMS CLARK, of Appleton, in the county of Outagamie and State of Wisconsin, have invented certain new and useful Improvements inPaper- Making Machines; Land Ifdo hereby declare the following to be a full7 clear, and exact description of the invention, such as will enable others Skilled in the art to which it pertains to make and use it, reference being had to the accompanying drawings, which form part of this specification.

. My invention relates more particularly to that class of devices in paper -making machines designed tol transversely spread or widen the felt that takes up the pulp which forms the sheet of paper.

The well-known difficulty experienced by manufacturers of paper which is caused by the contracting or shrinkage in width of the felt has heretofore been soughttobe obviated in different ways. One form of device` quite early used was to provide a vertically-arched rod, curved also in a horizontal plane, with its central body projecting forwardly in the gen'- eral line of Adirection of the moving felt apron, said rod being provided with .rollers loosely axled thereon in longitudinal line, and partakin g of the general form of said rod. The endless felt apron, which conveyed the paper from the wire-cloth apron to the usual press'- ure and heating cylinderspasses over this rod, and as the-latter was adapted to press vertically upward I against the -under side of the felt, the tendency was to causel the material in said felt to be drawn outward toward the respective side edges of the same; but a material objection to this device was found in the fact that the said upward pressure against the felt weakened it and tended to make it more liable to wear, while it maintained it constantly subjected to strain, and caused its line of direction to be vertically changed.

The form of device nowV generally in use is what is known as the elbow-roll, and consists of two distinct rolls of equal length, arrangedtransversely to the felt and in horizontal angular inclination to its width. The outer extremities of the two rolls' are in rear of their respectivel inner extremities, which latter project forwardly and centrally in the direction of the moving felt, so as to place each of the rolls inclined about fifteen degrees. to a straight line passing across the felt par allel with its width. These rolls are jour# naled in a suitable frame beneath the felt,1and are adapted to press vertically upward against the under side of the' same.' The 'degree of result produced in widening the feltdepends exclusivelyy upon the degree ofy thisjupward pressure, and varies correspondin gly'withthe SameLThis elbow-roll, however, is very'da|naging in its effect upon the felt, and is in reality only used as a last resort, when the felt must either be disearded'fromy use entirely or w'idened. The reason of this objection is that produces` an angle, over which the center of the felt passes, and soon developsv a sagin the same,'whichY causes the felt to beworn out in a short time. y l My invention is designed to, provide a spreading device which will be free from 'the objectionable features attending the use of the several forms employed previously to the same; and consists, first, in` two pairs of rolls, one or both rolls of each pair being journaled in yielding bearings, which are provided with means for regulating the tension on the rolls, said rolls having their axial lengths inclined about ten degrees (more or less) to the line of width' of the felt, and adapted to cause the latter to pass between said rolls subjected to their pressure action. Y This prevents any strain from being borne by the felt,A such as would be caused if there were but a single roll pressing up against the felt. According to lmy device, a combined upper and lower pressure in vertical line is' brought -to bear upon the felt, and since the two pressures are equal in degree there is no resulting injurious effect to the felt, as the one pressure counterbalances the other, and the felt is simply compressed between the two. f

Theinvention consists, secondly, in two pairs of rolls, one or both rolls of each pair bein gj ournaled in yielding bearings, which are provided with means for regulating the tension onthe rolls, the latter located angularly to the width of the felt, and adapted to receive the latter in compression between them in a plane corresponding to its general movement, and without vertically changing the same or making a raised angular formation therein. By thus causing the felt to enter between the rolls and pass out therefrom in one and the same plane in which it is located, respectively, in front and rear of said rolls, no vertical tension is imposed upon it, and it is thereby enabled to last the longer in good serviceable condition.

The invention consists, thirdly, in two pairs of rolls, one or-both rolls of each pairbeingjournaled in yielding bearin gs, which are provided with means for regulating the tension ou the rolls, the latterlocated augularly to the width of the felt, which passes through between the same, said rolls having adjustable elastic com pression relative to each other. The advantage of this adjustment of the rolls under spring pressure to and from each other is that thereby any degree of yielding compression may be put upon the felt as may be required, to suitably spread out the felt when the latter is in different conditions or degrees of shrinkage.

.The invention consists, fourthly, in the combination of two pairs of short angle-rolls, one or both rolls of each pair being journaled in yielding bearings, which are provided with means for regulating the tension on the rolls, the latter adapted by their location to cause the side portions of the felt to pass between the upper and lower rolls, respectively, of the same, said pairs of rolls being inclined at any desired angle to the width of the felt, with their inner extremities projecting forwardly toward the line of direction of said movingfelt. This construction causes the material of the felt to be drawn from the longitudinal central body of the same, and, together with the side portions, to be distended transversely, so asto widen the felt from its center out on both sides thereof simultaneously and equally.

The invention further consists in such detail mechanical forms as I prefer to employ in carrying out the main principles of my invention, as above set forth.

Referring to the drawings, Figure l is a view, in perspective, of a part of a papermalr in g machine provided with my invention, and which sufficiently illustrates the use of the same. Fig. 2 is a view, in vertical sectional elevation, in a plane passing through x y of Fig. 1. Fig. 3 is a longitudinal vertical sectional view in a plane passing through one of the pairs of angle-rolls. Fig. 4 is a perspective view of said angle-rolls mounted in a suitable frame, and shown detached from any machine.

The invention is applicable to any papermaking machine, and the form of the latter herein shown is simply given as an example of its use.

Two pairs of rolls, A, are journaled in suitable manner, so that they may be horizontally inclined in any desired angular degreerelative to the line of width of the felt B, upon which they are to act.

The inner extremities of each pair of rolls respectively project forwardly in inclination (more or less) from a straight line passing squarely across the width of the felt,'thongh the same may be changed to any other suitable degree of inclination. Preferably they are also made ot' length proportioned to the width of the felt, substantially as represented in the drawings, as the same form a very practicable form ot' device but, instead thereof, said rolls might be made shorter, or they could be extended forwardly toward the longitudinal central body of the felt. They are located so as to cause the felt to pass in between the upper and lower rolls of the respective pairs, and also to pass out therefrom in one and the same plane in which it `is placed,both before reaching said rolls and also after -leavin g the same. Thus the general longitudinal line ot' direction of the felt is not changed by passage through these an gle-rolls, though the material of the same is transversely drawn out andthe felt widened. Hence, it the felt were` moving in a horizontal plane, as is usually the case, then there would be no vertical change or al# teration of the same by reason of its subjection to the action of my rol1s. Instead, however, of placing said rolls in such location relative to the remaining parts of the paper-machine as is here represented in the drawlngs, -I may locate them in any desired place.

The upper andlower rolls of each respective pair are adapted to be adj usted relative to each other, and to be maintained in juxtaposition under elastic compression, so that they may be capable of` acting upon dii'erent felts, or upon the saine felt in different conditions of use and shrinkage'correspondinglywith the degree of pressure necessary to spread the same. I preferably mount them in a suitable frame, consisting of annpper and lower sec; tion, to which, respectively, the' corresponding rolls of the two pairs are journaled. Said upper section, C, is vertically adjustable in sliding movement upon guidefrods D, and provides bearing for the semielliptical springs E, which are likewise adjustable upon the upper extremities ofthe bolt-shaftsF. Suitable fastening devices, such asare represented by the hand' clamping-nuts f, adjust the'tension of said springs, and cause the upper framesection to bearits rolls downward with a greater or less pressure upon the lower rolls of each pair, which are journaled in the stationary frame-section.

It is evident that many changes 'of construction could bemade asregards the frame-work. Thus rubber or other resilient agent could be substituted for the metallicl springs, and gen- Aerally the detail apparatus lcan be altered as desired.

It is also apparentI that the peculiar device for spreading the felt is applicable to other and analogous purposes outside of paper-making machines; and hence the invention is not restricted in use to the latter, but includes all result in addition to that-'ordinarily eiiected by yielding tension-rollers, which is as follows Should the bearings ofthe yielding roller of each pair wear unevenly', or from other cause the tension on the roll of one pairexceed that of the roll of the opposite pair, the felt would be fed unevenly, and would run oft' the side of the rolls. This difficulty` is obviated by providing independent means for adjustingthe tension on the rolls 5 and by regulating the tension on the rolls of each pair the felt may be guided with the greatest accuracy.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a felt spreading or widenin g device for paper-making machines, two pairs of rolls arranged in an inclination to the width of the felt, one roll of each pair being journaled in yielding bearings, and means for regulating the tension on the adjustable bearing-frames, substantially as set forth.

2. In a felt-spreading device for paper-making machines, a roll-supportin g frame consisting in the combination of an upper and lower horizontal section, said upper section being adjustable under elastic spring-pressure relative toV the lower section, and both said sections having lon gitudinally-inclined rolls journaled therein, substantiallyvas set forth.

' 3. The combination, with the two framesections in which the upper and lower anglerolls are vrespectively journaled, of vertical guidelrods connecting the same, and boltshafts provided'with spring mechanism and clamping devices, adapted to adjust said sections relative to each other, substantially as set forth.

In testimony that I claim the foregoing I have hereunto set my hand this 5th day of August, 1878.

p ORSON WILLIAMS CLARK.