US1159381A - Suction couch-roll. - Google Patents

Description

F. H. HOBERG & C. C. THOMAS, JR.

SUCTION COUCH ROLL.

APPLICATION FILED APR.19. 1912.

1,159,381. Patented Nov. 9, 1915.

3 SHEETSSHEET I.

F. H. HOBERG & C. C. THOMAS, In.

SUCTION COUCH ROLL.

arrucmou FILED APR. 19. 1912.

1,159,381. Patented Nov. 9, 1915;

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F. H. HOBERG & C. C. THOMAS, JR.

SUCTION COUCH ROLL.

APPLICATION FILED APR. 19. 1912.

1,159,381. Patented Nov. 9, 1915.

3 SHEETSSHEET 3.

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rum: 1:. 1101mm Ann-commons 'rnouas, an, or (menu any, wrsoonsnr.

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county of Brown, and State of Wisconsin,

have invented new and useful'lmprovements in Suction Couch-Rolls, of which the fol-- lowing is a specification.

Our invention relates to improvements in couch rolls for aper making machines.

The object of our invention is to prov de an improved suction couch roll in which the pressure will be evenly distributed over the whole width and length of that portion erence characters throughout the several' of the roll which is covered with the carrier apron, and in which the moisture may be withdrawn without damage to the apron or to-the formative portion of the'paper sheet, and whereby dama e to the apron from fr1ctional contact wit suction boxes may be avoided.

In the draw'ings -Figure 1' is a diagrammatic view, illustrating our couch roll in its proper relation to the pulp receiving apron of a paper making machine. 'Fig. 2 is an end view, part in section, of a couch roll embodying our invention. Fig. 3 is a front elevation, part in vertical longitudinal section, of a couch roll embodying ourinvention, the periphery of the couch roll being progressively broken away adjacent to the portion in, section to show the manner in which the structure is built, up. Fig. 4 is a detail sectional view of a portion of a couch roll, showing a modified form of construction.

Like parts are identified by thesame refviews.

In Fig; I, an-apron A is illustrated in ordinary relation to a cylinder B, couch roll 0, suction box or guide roll D and initial compression rollers E and F, the apron ex-. tending on the return side over the rollers G, H, I, J and K. The member D may comprise the ordinary suction boxes or it may comprise a guide roll, since with our improved couch roll it isnot essential that a suction box be used. All of the above parts may be of any ordinary construction, except as to the couch roll, the specific structure of which will now be described.

Referring to Figs. 2 and 3, it will be observed that our improved couch roll is constructed with the cylinder 1 supported from Specification of Letters Patent.

' Application filed April 19, 1918. Serial 170. 691,988.

Patented Nov. 9, 1915.

a tubular shaft 2 by radial tubular arms 3.

The ends of the tubular shaft 2 are mounted in' supporting bearings 5. At one end the shaft 2 "extends through the bearing member 5, and is connected with a suction pipe 7. A coupling 8 allows shaft 2 to rotate independently of suction pipe 7.

The cylinder 1 is provided with annular flanges 9 on its periphery which support an annular series of rods 10, the ends of which are received in flanged collars 11. This series of rods 10 is covered by coiled wire 14 which is preferably wound around the cylinder in a helical coil, and is covered by wire netting 15. The wire netting 15 is jacketed with a heavy felt covering 16, the ends of which are preferably turned inwardly at 17 and engage between the flanged collar 11 and a clamping collar 19 which is bolted at 20 to the head piece 21. The flanged collar 11 has screw threaded engagement with this head piece and the ends of the cylinder 1 are mounted on inturned head flanges 23.

With the abovedescribed construction, it will be observed that the jacket or peripheral felt covering of the couch roll is supported from the cylinder 1 by the flanges 9 and rods 10, together with the coiled wire 14 and wire netting 15 which cooperate to prevent the felt covering or jacket from being depressed into the spaces between the rods 10. There is, therefore, an annular open space between the cylinder 1 and the jacket 16, unobstructed except by the flanges 9, rods 10 and the wire coil and net. The flanges 9 are provided at intervals with apertures 26 which allow water to flow along the surface of the cylinder 1 to .the tubular radial arms 3. The tubular arms 3 therefore serve the triple purpose of supporting the cylinder 1 from the tubular shaft 2, of

providing drainage for thespace between the cylinder 1 and the outer jacket, and of extending the vacuum produced by suction exerted through the pipe 7 into said space. The heavy jacket 16, which forms the periphery of the roll, so far obstructs the passage of air into the space between it and the cylinder 1 that a suflicient suction will be maintained through that portion of the periphery of the roll which is covered by the apron or carrier A, as shown in Fig. 1. The water will therefore be withdrawn from the pulp sheet through the apron A and through the jacket 16 into the annular suction space of the couch roll, and from this space it will be drained through the radial tubes 3 and tubular shaft 2 to the pipe 7.

The construction shown in 'Fig. 4: is the same as that shown in the other views, except at the ends of the couch roll and within the tubular shaft 2. In Fig. 4, the shaft 2 is provided with rotary cylindrical valves 30, having ports 31 adapted for registry with radial tubular arms 3. The valves 30 are also provided with ports 32 in position for registry with one of the arms 3*. One of these valves 30 is actuated by a rod 35 and the other valve 30. is actuated by a sleeve rod 36, through which rod 35 may extend in order that both rods may be actuated from the same end of the roll.

The flanges 9 on the cylinder 1 adjacent to the ends of the cylinder extend outwardly from the cylinder a little farther than the flanges 9 and are notched to receive the rods 10 to such a depth that the wire and felt.

coverings may bear directly on the peripheries ofthe flanges 9 These flanges 9 have no openings corresponding with the openings 26 in the flange 9 and it therefore follows that said flanges 9 constitute substantially complete partitions for the space between the cylinder 1 and the outer coverings, subdividing said space into annular cavities 38 and 39 respectively at each end of the roll. When the cylindrical valves 30 are rotated to closed position, the air will notbe exhausted from .the spaces 38 and 39.

By rotating the valves 30 until the opening 32 is in registry with the inner tube 3*", the vacuum will be extended to the cavity 39, and by rotating the valves 30 until the openings 31 are in registry with the tubular arms 3*, the vacuum will be extended to both cavities 38 and 39. Inthis manner, we are enabled to, increase or diminish the length of the suction area of our couch roll. When running narrow strips of paper, the valves will be rotated to cut off the suction from cavity 38, or from cavities 38 and 39. For example, assuming that the strip of paper is of a width'substantially equal to the distance between the inner flanges 9 the valves will be adjusted to cut off the suction from both cavities 38 and 39, whileif the strip is of a width equal to the distance between the outer flanges 9 the valves 30 will be adjusted to cut off the suction from the cavities 38, ports 32 of the valves being in registry with the cavities 39 to permit the vacuum to extend thereto. It will of course be understood that any desired number of these independent annular cavities may be provided and the suction applied or cut off by means of suitable valve mechanism.

The valves 30 are preferably provided with segmental guide channels 40 into which bular shaft 2, whereby the rotative movement of the valves 30 may be limited.

We claim 1. A suction couch roll comprising a cyllnder, a jacket adapted to absorb moisture by capillary attraction and by suction, enclrcling said cylinder and spaced therefrom, crossed reinforcing members v supporting sald jacket from the cylinder at all points and adapted to prevent the formation of hollows or channels in the outer surface of said jacket, said cylinder being provided with a suction duct leading from the space between the cylinder and jacket.

2. A suction couch roll comprising a closed cylinder provided with annular peripheral ribs, an annular series of jacket supporting rods mounted on said ribs, a netted covering for said rods, a jacket of non-metallic absorbent material. inclosing the netted covering and forming the periphery of the roll, and means for applying suction to thespace between the jacket and cylinder.

3. A couch roll consisting of the combination of a tubular shaft, a closed cylinder supported by said shaft, tubular radial arms communicating between the interior of the shaft and space exterior to the periphery of said cylinder, a series of annular apertured ribs mounted upon the periphery of said cylinder, a seires of rods connected with the cylinder at their respective ends and having their intermediate portions supported by said ribs, a perferate metallic covering for said rods and a felt jacket mounted upon said metallic covering and held in cylindrical form thereby.

4. A suction couch roll provided with a jacketed periphery, of absorbent material, means for supporting said jacket in true cylindrical form, said roll having an annular suction cavity immediately underneath said jacket.

5. Asuction couch roll comprising a closed cylinder, a set of annular ribs encircling said cylinder at spaced intervals and having outwardly converging walls, sets of rods superposed with those of one set crossing those of the next set, the rods of the successive sets being progressively smaller in diameter and greater in number and in proximity to each other, a. jacket composed of' nonmetallic fabric encircling the outer set of rods, and means for applying suction to the space between the jacket and the cylinder, said outer sets of creased rods being of such size and arranged in such proximity as to form a substantially continuous support for said covering while erasing substantially inder, an absorbent severing for the cylinstop projections 41 may extend from th er s aced therefrom, means for withtherefrom and composed 0 tubes exten drawing fluid from the s ace between the cylinder and covering, an a set of annular v the cylinder, a peripheral jacket of nonme'tallic absorbent material encircling the cylinder and spaced therefrom, valves in the shaft adapted to close and open communication with some of said suction tubes, and annular partitions subdividing the space between the cylinder and jacket.

In testimony whereof we afiix our signatures in the resence of two witnesses.

FR NK H. HOBERG, COMADORE O. THOMAS, JR. Witnesses:

AUG. HEMMINGREN, ALPI-IONSE Dn-Gnoor.

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