US2240869A - Wire faced roll for papermaking machines - Google Patents

Description

y 6, 1941- ,H. G. SPECH'i' 2,240,869

WIRE FACED ROLL FOR PAPERMAKING MACHINES Filed April 17, 1959 /4 15 [Z 16 gm INVENTOR HARRY E. .EIFHEET. Jum.

ATTORNEY Patented May 6, 1941 WIRE FACED ROLL FOR PAPERMAKING MACHINES Harry G. smut, Montclair, N. 1., assignor to Encor Corporation, Belleville, N. 1., a corporation of New Jersey Application April 17, 1939, Serial No. 268,166 Claims. (01. 92-43 The present invention relates to an improvement in wire faced rolls for papermaking machines, and particularly dandy rolls and cylinder moulds, an object of the invention being to provide a roll structure which may be manufactured economically, and will be extremely rigid and light in weight, while at the same time providing maximum drainage and freedom from clogging. I

Heretofore the usual practice in manufacturing dandy rolls and cylinder moulds has been to first construct a rigid frame composed of rods either wound or supported lengthwise in relation to spiders, these rods being soldered at all crossing points so as to provide a rigid support. Upon this support a wire is wound helically, to provide a foundation support for the fine wire mesh covering, which is placed about theroll and sewed or otherwise fastened at the seam. This construction has the disadvantage that it requires a great amount of skilled manual labor, making its manufacture both slow and expensive, it is extremely difilcult to obtain uniformity,

each roll being practically custom built, and the construction necessitated considerable weight of metal per square inch of surface in order to obtain the required rigidity and strength. Also the contacting relation between the wire mesh covering and the wound wire supporting structure prevented maximum drainage and caused fibres to become clogged therein.

It is proposed in the present invention to provide a roll in which the supporting frame consists of a series of sheet metal units so constructed and arranged as to provide a rigid cylindrical structure, having projecting fins for supporting the wire mesh covering with a minimum of contact between such fins and the covering, so that there will be no appreciable obstruction to the mesh openings, and to provide drainage openings of relatively large extent spaced inwardly from the wire mesh covering. It is proposed to give such structural shape to the sheet metal be hereinafter more fully described with reference thereto, and the invention will be finally pointed out in the claims.

In the drawing:

Fig. 1 is a side elevation of a. dandy roll, the intermediate portion being broken away, and a portion of the wire mesh covering being broken away to show the supporting structure.

Fig. 2 is an end view thereof.

Fig. 3 is a perspective view showing a portion of one of the frame producing channel units from one end.

Fig. 4 is a perspective view showing the same from the other end.

Fig. 5 is a fragmentaly plan view on an enlarged scale as compared to Figs. 1 and 2, showing a portion of the supporting frame structure, with the wire mesh covering partially broken away. i

Fig. 6 is a view partially in end elevation and partially in transverse section, taken along the line 6- of Fig. 5.

Fig. '7 is a transverse sectional view taken along the line l| of Fig. 5.

Fig. 8 is a longitudinal sectional view. taken along the line 8-8 of Fig. 5.

Similar reference characters indicatev corresponding parts throughout the several figures of the drawing.

Referring to the drawing, the dandy roll, or cylinder mould according to the exemplary illustrated embodiment of the invention, comprises a supporting shaft ii] on which there is supported a series of circular spider heads H, suitably spaced apart to provide the necessary support for the cylindrical wire mesh supporting structure, as will hereinafter more fully appear. In the case of the usual dandy roll the diameter may be approximately one to two feet and the length as much as 16 or 20 feet, de-

pending upon the width of'the Fourdrinier mashorter.

While the shaft I0 is shown as extending entirely through the roll it will beunderstood that it is only necessaryto the structure to employ short end shafts secured to the end spider heads,

in which case the intermediate spider heads will not be shaft-supported, but will simply be held a in place by'their connection with the cylindrical supporting structure, as will presently more fully appear.

Each of the spider heads II is provided in itsouter periphery with a series of spaced radial slots I2 in which are secured the flanges of the cylindrical supporting structure, as will presently more fully appear.

The cylindrical supporting structure is made up of a series of strip members, each extending the length of the roll. These strip members are formed from a strip of relatively thin sheet metal, preferably bronze or brass, but which may be of any suitable material, this strip being bent I into channel form to provide side flanges l3 and order to render the fin rigid againstvhending,

and also to impart to itsouter edge a transversely widened supporting surface, it has a rib I! pressed therein, which is substantially semicircular in outline, and this rib is continued into the portion ll ata downwardly inclined angle, as at is, the portions of the transverse connecting portion is at each side of the portion viii being depressed as at 20-2.. This renders the fin and its supporting portion l5 rigid againstbending, and at the same time provides a surface which is free of any corners or flat surfaces in which paper fibers may become lodged, the surface acting as a deflecting funnel-like guide for draming the water which passes through the mesh covering of the roll through the openings I]. The flanges l3v and II converge slightly toward their lower edges, so that in the assembled relation in the roll they are substantially radial with respect to the axis of the roll.

In assembling the support-forming members the flange ll of one strip is placed in contact with the flange ll of the adjacent strip, and these two flanges are inserted into one of the slots production of a perfect. cylindrical supporting surface. I a

The fine mesh wire covering 2| is placed over the cylindrical supporting roll in contact with the outer supporting edges of *the fins I8, and is sewed, soldered, or otherwise suitably secured at the seam 22 to complete the finished roll. In

order to prevent any shifting or creeping of the wire mesh covering its end edges are secured at the underside by spots of solder 23 connecting it at suitably spaced points to certain of the end fins I6, as shown in Fig. 8.

Inasmuch as the channel strips forming the supporting structure may be of a very thin gauge light metal, while still providing a'rigid support 7 for the wire covering, the edge surfaces of the II of the spider heads. The strips are prefer- Y ably so arranged that the flns of one strip will be offset with respect to the fins of the adjacent strip, as shown clearly in Fig. 5, thus providing a uniformly distributed supporting surface for the wire mesh covering.

Instead of the arrangement, where all of the strips are similarly placed, as shown in Fig, 5, alternate strips may be placed in reverse arrangement, so that the ribs ll of the alternate strips will project in opposite direction from the ribs I! of the other strips.

The contacting flanges l3 and ll of the adjacent strips are secured together by brazing, or they may be secured by coating them with solder and then sweating them together, and the flange ends inserted in the slots are rigidly secured .to thespider heads by brazing or soldering these fins in contact with the wire mesh can approxicovering, provide clear passage for the drainage of water therethrough without any chance of clogging, the inclined surfaces of the portions l5 being self-cleaning as water passes over them. In the event of damage to a roll, it is a simple matter to repair it by removing and replacing the damaged part, and thereupon refinishing the surface of the whole roll to provide a perfect oylindrical support.

I have illustrated and described a preferred and satisfactory embodiment of the invention, but it will be understood that changes may be made therein, within the spirit and scope thereof, as defined in the appended claims.

HavingthusdescribedmyinventiomwhatI claim and desire to secure by letters Patent is:

1. In a cylinder roll for papernnking machines; a cylindrical supporting structure for a wiremeshcoverlng comprisingapluralibof longitudinally spaced coaxial circular head members, a plurality of circumferenflslly arranged supporting members extending between said head members'and connected thereto. said supporting members having longitudinally spaced openings and longitudinally spaced fins projecting outwardly and each having a longitudinally extending reinforcing means inwardly spaced from'theouteredgesofsaidflnatheouteredges of said fins constituting a supporting surface for the wire mesh covering outwardly spaced from said longitudinally extending reinforcing means.

' 2. In a cylinder roll for papermaking machines, a cylindrical supporting structure for a wiremeshcoveringcomm'isingapluralityof longitudinally spaced coaxial circular head members, a plurality of circumferentially arranged simportingmembersarrangedparalleltotheasis of said head members extending between said members and conected thereto, said supporting members havinglongitud-inally spaced openings and longitudinally spaced fins projecting out-' wardly and each having a longitudinally extending reinforcing flange inwardly spaced fromtheouteredg'esofsaidflnsandradlallydisposed 5 the outer of said fins constituting a supporting surface for the wire mesh covering out wardlyspaced from said longitudinally extendlongitudinally spaced coaxial circular head members, a plurality of circumierentially arranged supporting channel strip members arranged par-, allel to the axis of said head members extending between said members and connected thereto, th

transverse portions of said strip members havin longitudinally spaced openings and longitudinally spaced fins projecting outwardly, the outer edges of said fins constituting a supporting surface for the wire mesh covering the flanges of said channel strip members projecting inwardly and constituting longitudinal supports for a wire mesh covering inwardly spaced from the outeredges of said fins.

4. In a cylinder roll for papermaking machines, a cylindrical supporting structure for a wire mesh covering comprising a plurality of longitudinally spaced coaxial circular head mem- -bers, a plurality of circumferentially arranged supporting channel strip members arranged parallel to the axis of said head members extending between said members and connected thereto, the transverse portions of said strip members having longitudinally spaced openings and longitudinally spaced fins projecting outwardly, the

outer edges of said fins constituting a supporting surface for the wire mesh covering, the side flanges of said strips projecting inwardly and contacting the flanges of adjacent strip members and constituting double thickness longitudinal supports for said wire mesh covering inwardly spaced from the outer edges of said fins.

5. The invention as defined in claim 4, further characterized by metallic adhesion joints rigidly connecting said contacting flanges.

6. The invention as defined in claim 4, further characterized by metallic adhesion joints rigidly connecting said strip members to said head members.

'7. The invention as defined in claim 4, further characterizedin that said head members are provided in their peripheries withradially disposed spaced slots engaged by said contacting flanges of said strip members.

8. In a cylinder roll for papermaking machines, a cylindrical supporting structure for a wire mesh covering comprising a plurality of longitudinally spaced coaxial circular head members, a plurality of circumferentially arranged supporting members extending between said head members and connected thereto, said supporting members having longitudinally spaced openings, there being a transverse supporting portion adjacent one edge of each of said openings,

its transverse supporting portion being at an.

obtuse angle thereto to deflect water from the surface of said fin toward the edge of said supporting portion.

9. In a cylinder roll for papermaking machines, a cylindrical supporting stucture for a wire mesh covering comprising a plurality of longitudinally spaced coaxial circular head members, a plurality of circumferentially arranged supporting members extending between said head members and connected thereto, said supportin members having longitudinally spaced openings, there being a transverse supporting portion adjacent one edge of each of said openings, and a fin projecting outwardly from said supporting portion at an angle thereto, a reinforcing rib in said fin extending into said reinforcing portion to render it resistant to bending and to defiect water from the surface of said fins toward the edge of said supporting portion, the outer edges of said fins constituting a supporting surface for the wire mesh covering.

10. In a cylinder roll for papermaking machines, a cylindrical supporting structure for a wire mesh covering comprising a plurality of longitudinally spaced coaxial circular head memfins constituting a supporting surface for the wire mesh covering.

HAERY, G. SPECH'I.

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