US2415351A - Papermaking machine - Google Patents

Description

Feb- 4, w47. 1 HQRNBOSTEL Em.

PAIER MAKING MACHINE Filed April l, 1944 oppose the latter.

atented Feb.. i947 Lloyd Hornbostel and .i

Wis., assignors to Beloit liron Works, Beloit,

Wis., a' corporation of Wisconsin applic-atm april i, i944, serial No. 529.20

(ci. ca -i9) 3 claims. i

This invention relates to a paper making machine of the Fourdrinier type for` the manufacture of soft tissue paper, and'it is specifically directed to the take-od or suction transfer roll assembly of such machine It is one of the principal objects of this invention to simplify the construction of a suction transfer roll assembly for a paper making machine such as contemplated herein, andr to improve the efficiency, operation and'fdep'endability of such assembly.

This invention has for its object to provide a wider or increased range of functions over those heretofore usually assigned to and performed by the suction transfer roll Vof a Fourdrinier paper making machine;

Another of theprincipal objects hereof resides i in providing positive means to prevent an unsupported longitudinal draw or pull upon the paper sheet between the point of .its withdrawal from art after understanding the construction and opthe formingl wire and its engagement by the initial or first press roll assembly. This eectively overcomes any tendency to stretch or rupture the sheet while it is in transit.. M

it is a further object hereof to provide an al'-` rangement whereby the loop of the bottom felt is advanced or set aheadA to a position where it is proximate the suction transfer roll whereby it is brought into direct opposition thereto for cooperation with the top felt and the paper sheet at the suction area of the transfer roll. vi A further object of` this invention is to provide a suction transfer roll that is adapted to perform a plurality of operations or dual functions such as the sucking of the paper sheet to the pick-up top felt from the forming wire, and the holding or retaining 4 of the sheet on the top felt until it reaches the bottom felt where said sheet will become interposed between the two felts.v

Also it is an object hereof to provide a transfer assembly in a paper making machine wherein spaced nips are defined with relation to the suctiontransfer roll, the said nips being respectively between said transfer roll and. 1) the co1 :h roll in the wire loop, and (2) a roll upon which the loop of the bottom felt is trained.

In this connection the 'present invention aims to provide means for effectively mounting the roll forthe bottom felt'loop preferably upon the same support with the suction transfer roll to By reason of this assemblyl .thef transfer roll will perform cooperative func- .tions with both the top felt and the bottom felt.

Additional aimsand advantages ofy this invention will'be'apparent to persons skilled in the ed upon the columns l2, which colums have an 3ohead support Il. The plunger rod .22 hasan eneration thereof from the following description. It is preferred to practice this invention in substantially the manner hereinafter described in detail and as more particularly pointed out in the claims. Reference is now made to the accompanying drawing that forms a part lof this speciflcation, in which,

` The figure is a diagrammatic side elevation oi the transfer end of the press section and the delivery end of the forming wire section of a paper making machine showing the instrumentalities of the present invention.

The delivery end of the forming wire 5 is formed in a loop by being trained upon the primary suction couch roll t and a second couch roll l. The primary suction couch roll has its trunnions journaled in uprights arising from asuitable base 9, and the couch roll 'i has its trunnions journaled in brackets i@ upon the top of the base 9. `Above the delivery end of the assembly just described, there is an overhead support il that is mounted upon the tops ofy columns i2 that are spaced from the looped end of the forming wire in the manner shown to provide an overhanging portion i3 of said overhead support. A

IThe initial or first press roll assembly is mountoiset shelf I6. This press roll assembly com prises a lower suction press roll that is yield'- ably opposed by the plain roll i6 to dene a nipl between [said rolls. The trunnions of the lower suction Apress roll l5 are mounted in suitable bearings il-that are secured to and ari/sfrom the shelffl: "The trunnions of the plain press ro1l i6,arejournaled in bearings I8 carried by intermediate portions of horizontal arms i9 that have their ends nearest the columns l2fu1crumed on pivots 2li.v The movableouter orffree ends of .the arms i9 are yieldably urgedl india downward direction toward suction roll .i5 by a plunger assembly comprising a cylinder 2l.v and a plunger rod 22, the cylinder being carried by trunnions 23 in lugs or-ears 24 depending from the overlargement 2E from which trunnions-'26 project horizontally 4and are engaged in bearings in the adjacent outer endsof the arms I9. `The super'- posed top and bottom felts 21 and 28 respectively, with the 'intermediate paper' sheet ply, are trainedv through the nip defined by the suction 'press roll 'I5 and opposing roll IB. The suction transfer roll 29 -yieldably opposes the couch roll `'lto define, a nip through which the pick-up top felt 21 is trained in a manner so that it will contact the paper sheet while it is traveling on the delivery end loop-of the wire. The trunnions of this transfer roll 29 are journaled in bearings 30 in the outer ends of a suitable rocking frame. This rocking frame comprises supporting members SI of inverted l.- shape the lower ends of which are provided 'with trunnions 32 that are movably mounted .in bearings 33'in suitable base blocks 34. Beyond the bearings 30 for the suction `transfer roll trunnions, the L-shaped frame members 3l are provided with upwardly inclined arms 35 for rotatably supporting an idle roll 36 upon which the pick-up top felt 21 is trained and from which the top felt travels to the nip dened by the suction transfer roll and couch roll 1.

The upright portions of the frame members 8l have arms 37 pivotally mounted thereon by means of studs 33 and the outer movableportions of these arms 31 are provided with hearing brackets 39 for journaling a roll 40 upon which the cover or bottomfelt 2'8 is trained and from which said bottom felt travels in an upwardly inclined dlrection to the nip dened by the iirst press roll assembly. This arrangement positions the roll 40 in opposition to the transfer roll 29 and disposes the loop of the bottom felt 28 close to but spaced from the 'delivery loop of the forming wire 5. The roll 40 is yieldably urged toward the suction transferroli by springs Si that are interposed between the outer ends of the roll supporting arms 31 and follower disks d2 upon the adjacent ends of threaded rods d that are screwed into internally threaded bosses on brackets le and which may be turned by hand wheels to adjust the tension of the springs di. The roll 48 and the suction transfer roll 29 which it opposes denne a suction nip that is spaced from the rst nip which is dened by the transfer roll 29 `and the couch roll 1. For convenience the two spaced nips are indicated by arrows on the couch roll 1 and bottom felt roll Il! and they are identified respectively by the characters A and B.

The assembly which is mounted upon and slipported by the L-shaped frame members 3i is yieldably urged toward the couch roll 'i by a plunger B6 operating in a cylinder d1 that has a pivotal mounting upon brackets d8 on the upper portion of the frame members 3l. In this manner the suction transfer roll yieldably opposes the couch vroll 1, and vsaid transfer roll is in turn 'yeldably opposed by the roll eil upon which the bottom felt is trained, and there is only a short distance traversed by the transferred paper sheet before it is covered by the bottom felt 28. Adjustable suspension rods 49 for the roll `29, used during felt changing operations, have theirlower ends pivotally mounted in ears 50 arising from convenient portions of the frame members 3|, the upper ends of said suspension rods being provided with elongated eyes 5l that are engaged with a rod 52 extending horizontally across the overhang portion of support H.

The suction area `of the transferroll 29 is of such dimension that Iit includes both the nips A and B. The transfer roll 29 has a suction passageway 53 opposite the nip A to be effective thereat and there is another passageway 54 that extends from alongside the rst passageway at least to the second nip B. In this manner the suction area of transfer roll 29 is divided into two areas, one of which is wider than the other in its circumferential dimension. There is a control damper or flap valve 55 in the passageway ll that The paper carried with the forming wire 5 A after leaving the primary suction couch roll ii has preferably been substantially dried, and when f the sheet reaches the nip A the high suction area of the transfer roll 29 will suck the paper at the nlp A onto the top felt 21 so 'that the sheet -will move along with this top felt. The paper and top felt now reach the inuence of the lowv suction area of transfer roll 29 that will hold the paper against the top felt 27 throughout the low suctionA area or until two plies meet the bottom felt 28 at the nip B and cover the paper. From this location the paper will be maintained bctween the two felts 21 and 2t in transit to the press roll assembly l and i6. 'The effect of the suction on the paper and feit while spanning the lspace between the nips A and B is such that there is no pull upon the paper sheet. The paper sheet upon leaving the nip B will be interposed between the two felts to be supported and moved thereby to the first press assembly.

It will, of course, be understood that various details of construction may be varied through a wide range without departing from the principles of this invention and it is, therefore, not the pur-I pose to limit the patent granted'hereon otherwise than necessitated by the scope of the apn pended claims.

We claim as our invention: 1. -In a paper making machine having a looped forming wire with a rst plain roll in the lp of the wire and a suction roll preceding said first roll, a suction transfer roll opposing the rst roll 45 to define a first nip, means in said transfer roll providing adjacent high and low suction areas thereon, a second plain roll opposing said transfer roll to define a second nip spaced from said nrst nip, a pick up felt trained through said first 50 and second nips, a cover felt trained through said second nip, the high suction area of said transfer roll being constructed and arranged to suck a paper sheet from the wire tothe piclr` up felt adjacent said first nip,and the low suction 55 area of said transfer roll extending from said high suction area to the point; where said cover felt lies in juxta-position to said pick up felt, the low suction area being constructed and arranged to support the paper sheet on the pick up fel-t 50 until engaged by said cover felt.

2. In a paper making machine having a looped forming wire with a iirst plain roll in the loop of the wire, a suction' transfer roll opposing saidv first roll to define a rst nip, means in said transfer roll providing adjacent high and low suction Aareas thereon, a second plain roll opposing the transfer roll to define a second nip spaced from said iirst nip, a pick up felt trained through said first and second nips, a cover felt trained through 10 said second nip, the-high suction area. of said transfer roll being constructed and arranged to suck a paper sheet from the wire to the pick up felt adjacent the nrstnip, and the low suction area of said transfer roll extending from said blah suction area .to said second nip, said low 5 suction area being constructed and arranged to support the paper sheet on said pick up feit until engaged by said cover teit in said second nip.

3. In a paper making machine having a looped forming wire and a first roll in the loop of the wire,`a movable frame, a suction transfer roll on said frame, means urging said frame in. the direction to engage said suction transfer roll with said rst roll, thereby dening a rst nip, arms fulcrumed on said frame, a second roll carried by said arms, means yieldably urging said arms to engage said second roll with said transfer roll to dene a second nip, a bottom felt trained on said second roll and passing through said second nip,

REFERENCES le of this patent:

Number a top felt passing through said rst and second 15 Number UNITED STATES PA Name Date Street Jan. 4., 19de Collins Feb. 5, 1929 Berry Jan. 25, 1944 H111 Oct. 3, i939 Berry July 30, 1940 Millspaugh June 11,1194@ FOREIGN PATENTS Country Date British Jan.l 26, i939 British 191i French Nov. 7, w89

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