US1578590A - Paper-pulp screen - Google Patents

Description

C. FANCHER March 30 1926.

PAPER PULP SCREEN Filed July 16, 1925 3 Sheets-Sheet 1 Clarence farm/te n March 30, 1926. 7 1,578,590-

c. FANCHER PAPER PULP S GREEN Filed July 16, 1925 s Sheets-Sheet 2 gmwntoz abkozwaq March 30 1926.

1,578,590 C. FANCHER PAPER PULP SCREEN Filed July 16, 1925 3 Sheets-Sheet 5 I 1' HM] ll) "1| H fi I 3mm larenoe I'ancker. I

Patented Mar; 30, 1926.

shaft.

, its entire periphery longest possible wear UNITED STATES PATENT-OFFICE.

mamma- Norma, or HUDSON runs, new Yonx.

rn'rnn-runr Application fled m 15, 1925. Serial No. 44,052.

means for operating the diaphragms thereof.

An important object of myinvention is the provision of a device of this character in which a roller shoe takes the place of the usual fixed wooden shoe on the vertically movable plunger which engages the cam Another object vide a device of the above mentioned character with a roller which is so related to the operating cam that the wear upon the roller shoe will be evenly distributed over thereby insuring the for theroller shoe,

changing the shoe.

A further object of my invention is' to provide means for changing the length of vibration of the diaphragm without replacing the cams.

Other objects and advantages of my invention will be apparent during the course of the following description.

In the accompanying drawings which form a part of this specification and wherein likecharacters of reference denote like or corresponding parts throughout the same,:

Figure 1 is a side elevation of a portion of a machine embodying my invention,'parts being broken away,

Figure 2 is an edge view thereof parts being broken away, parts in section, and parts being in elevation,

f of a. machine embo Figure 3 is a side elevation of one of the operating cams, o

Figure 4 is an end elevation of the same, Figure 5 is a side'elevat-ion of a portion dying a modification of my invention, parts being broken'away,

Figure 6' is an edge view. thereof, parts being broken away, parts in section, and. parts bein in elevation, and Figure is a detail view showing the arrangement of the leaf springs.

In the drawings wherein for the purpose may be adjusted by the nut.

of illustration is shown apreferred embodiment of my. invention, the numeral 10 designates the customary vat of a pulp screen provided diaphra 12. The vat 10 is mounted on standar 13 which inturn support and are sup orted by the customary longitudinal bri getree 14 which supportsjournals for cam shaft 15 provided wlth the usual-wells or recesses for lubrication of the came 16,

said cams being spaced on shaft to correspond to the several compartments of the screen, and the shaft is rotated by means of a suitable pulley 17 or the like.

The cams are provided with a number of rises or swellin '18 spaced at equal disi r tances apart an joined by convex surfaces of my invention is to pro hereinafter described.

Roller hangers 21 are secured to diaphragm boards 22 and comprise forked or bifurcated lower ends 23 which support bearings 24 roller shoes 26 are journalled. The forked ends 23 are hollowed for the reception of lubricant for the bearings, and fit within casingsections 27 which are slotted at 28 with the usual screen plates 11 and r in which the trunnions of for the roller shoe and s read out to cover I the cams and are seen 14 at their base." A transverse cross bar 29 is an extension part on each casin section and extends between the forks of t 0 lower end of the hangers where they are bolted together and clamp and support a vertically and upwardly extending rod 30 which has its upper end threaded to receive the nut and ca 31 which bear a ainst the coil spring 32 which in turn bears down on the hanger. It will be seen that upward movement of the roller shoe and hanger is resisted by the spring 32 which will return the shoe to its normal position, and the-tension of which The roller shoe rests upon the cam and -is caused to reciprocate thereby. cam sizes are for the purposeiof a larger or smaller pulsation to the diaphragm to the bridgetree The different and may be changed by loosening the collars is secured thereto by means of the clamp 36.

A bolt 37 is secured at one end to the bridgetree and extends vertically through the shelf, spring and clamp and a substantial distance thereabove. A coil spring 38 surrounds the upper end of the bolt and is held in place by the collar '39 which is ad ustably secured in place by the nut 40.

It will be seen that "in this modification, upward movement of the hanger is resisted by both of the springs.

The shoe will rise and fall uniformly due to the fact that swellings 18 are connected by convex rather than concave or hollow surfaces, and as the cam is operating agamst a revolving surface the rise may safely-be more abrupt than is used with" the sliding wood shoe block causing a sharper upward movement thereby keeping the plates more open and very much increasing their capacity and the output of the screen. As each rise 18 of the cam comes in contact with the periphery of the roller shoe, the rising actlon of the swelling 18 upon the cam surface is m the nature of a blow, modified, it is true, by the gradual character of the curve formlng the adjacent swellings but nevertheless sufll-- cient toexert a wearing effect upon the surface, which wearing effect, if repeated 1n the same place, would ultimately result 1n changing regularity of the cylindrical periphery of the surface of the roller shoe and would form a succession of ridges. The resulting effectwould be, moreover, toimpart an irregular motion of constantly increasing disadvantage to the reciprocating diaphragm, instead of the uniform and wavelike undulations desirable in practice, andwhich insure the long life of the diaphragm and the maintenance of its elficient action upon the body of the pulp contained in the screen- This irregularity of the action of the diaphragm is accompanied with sagging and'irregular flexure thereof, with a consequent liability of rupture of the rubber 7 along the inner edges of the wooden tank or vat, and is a difliculty which is met with in ordinary practice wherein a content wearing of the usual fixed wooden shoe has for its consequence a constant increasing pull on the diaphragm with a resulting rupture which would not occur with the roller shoe.

By the expedient of proportioning the length of the periphery of the roller shoe to that of the cooperating cam, in such manner that the roller shoe has a much longer on the-contrary, portions of the surface of the roller shoe immediately in advance or in the rear thereof, thereby causing a pro.- gressive distribution about the entire periphery and maintaining a more constant position of the rubber diaphragm and prolonging its life.

The roller shoe should be considerably larger than the cam, and not in multiples thereof. I have found in practice that a, ratio of 14 to 6 is very suitable, although other proportions may be used with equal success. The wear upon the shoe will be uniform, and the shaft, under these circumstances may be rotated in either direction, which is not the case with a fixed wooden plunger.

I prefer to make the roller shoe of metal and preferably of steel as it admits of lighter construction and less power to run, the cam is case hardened, and ground true. Due to slightness of wear, an even vibration of diaphragm is insured, which greatly lengthens its life and efiiciency, and due to the fact that the shoe is a roller and spring pressed, its operation is practically noiseless, which is a great-improvement over theold type of screens which caused a terrific din, especially when the iron shoe block is used to avoid down pull on the diaphragm.

A two year trial run under actual working strain gave a drop to the diaphragm in place of the numerous drops when the wood shoe block was used, and the surface of the roller shoe and cam was smoother than when first put in place.

While I have-shown and described the preferred embodiment of my invention, it 'is tonbe understood that various changes in the size, shape, and arrangement of parts may, be resorted to without departing from the spirit of my invention or the .scope of the subjoined claims.

Having described my invention what I claim and desire to protect by Letters Patent is: c Y

-1 .-A paper pulp screen having a flexible diaphragm, a hanger connected to the diaphragm, a shoe attached to said hanger, a cam-shaft, a series of rotary cams of differ ent sizes, 'arranged on said shaft, said shoe being adapted to cooperate with one of said cams, and means whereby the cams may be moved so that a different cam will cooperate with the shoe to impart a change of vibration to the diaphragm.

2. A paper pulp screen having a flexible diaphragm, a hanger connected to the diaphragm, an axially rotatory circular shoe journalled in said hanger, a cam shaft, a series of cams of different sizes arranged on said shaft, one of said cams being adapted to cooperate with said roller shoe to Vibrate the diaphragm and means to shift the cams with respect to the roller shoe whereby a different cam may be made to engage the shoe to impart a different length of vibration to the diaphragm.

3. A paper pulp screen having a flexibh diaphragm, a hanger connected to said diaphragm, an axially rotatory circular shoe journalled in said hanger, a cam shaft, a series of cams of different sizes arranged on said shaft, one of said cams being adapted to engage the said roller shoe to vibrate the diaphragm, the length of the periphery of the shoe being greater'than that of the cams and practically incommensurable therewith, and means whereby the cams may be shifted .with respect to the roller shoe in order that a diflerent cam may engage the shoe to change the length of vibration of the diaphragm.

4. A paper pulp screen having a flexible diaphragm, a hanger connected to said diaphragm. said hanger having its lower end forked, bearings carried by the forked end, a roller shoe having trunnions journalled in the bearings, the forks being hollowed out to form chambers leading to the bearings for lubrication of said bearings, a cam shaft, a cam on said shaft, said cam having gentle rises of outwardly curved surfaces cooperatforked, bearings carried by the forked end of the hanger, a roller shoe having trunnions jour'nalled in said bearings, the forks being hollowed out to form lubricant chambers leading to the bearings, aspring adapted to resist upward movement of the hanger, a 1

cam shaft, a cam block on said shaft comprising a series of cams, said cams having gentle rises of outwardly curved surfaces adapted to cooperate with the roller shoe, the length of the periphery of the roller shoe, being greater than. that ofthe cams and practically incommensurable therewith, and means whereby the cam block may be shifted to bring different cams into engagement with the roller shoe .to change the length of vibration of the diaphragm.

i 6. A paper pulp screen having a flexible diaphragm, a hanger connected to said diaphragm, said hanger having its lower end forked, bearings carried by the forked end of the hanger, a roller nions journalled in said bearings, the forks being hollowed out to form lubricant chambers leading to the bearings, a split casing section surrounding the hanger and roller shoe, arod passing upwardly through a portion of the hanger, a spring secured to said rod and pressing down on the hanger, a cam shaft, and a cam mounted thereon and adapted to engage the roller shoe.

In testimony whereof I affix my signature.

CLARENCE FANCHER.

shoe having trun-

Images