US947125A - Screen for paper-making machines. - Google Patents

Description

J'. W. REYNOLDS. SCREEN FOR PAPER MAKING MACHINES.

APPLICATION FILED FEB. 27, 1909. 947, 1 25, Patented Jan. 18, 1910.

2 SHEETS-SHEET 1 smawtoz Wit nuns J. W; REYNOLDS.

SCREEN FOR PAPER MAKING MACHINES.

APPLICATION FILED FEBJZ'T, 1909.

Patented Jan. 18, 1910.

2 SHEETS-SHEET 2.

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SGREEN Forv PAPER-MAKING- MACHINES.

To all whom 'it may concern:

Be it known that I, JOHN VVILLIAM REY- INOLDS, a citizen of the United States, residing at Ballston Spa, in the county of Saratoga and State of New York, have invented a new and useful Screen for Paper-Making M Specification of Letters Patent. Application filed. February 27, 1909.

Machines, of which the following is a specification.

This mven-tion has reference to improvements in screens for paper making machines whereby the paper stock 1s screened prior to its treatment in the paper making machine proper.

The object of the present invention is to produce a screen which w1ll prevent the accumulation of slime or the working of the stock into strings and which will screen the stock much cleaner than is the case wlth the screens ordinarily in use. Furthermore, the

improved screen is very compact and of simple construction.

Ordinarily the paper stock is. screened through a horizontal screen and one of the principal features of the present invention is the arrangement of the screen plates vertically or at an angle, to the horizontal, ap-

proaching the vertical. In this way a very I much larger screening surface is obtained. .than wlth horizontal screens in the same floor space, while in practice the upright screens possess marked advantages over the horizontal screens.

The invention will be best understoodfrom a consideration of the following detail description taken in connection with the accompanying drawings forming a part of this specification, it being understood however that the invention is not limited to the exact showing of the drawings eitherin the con.-

struction of the parts or the location of the parts since various modifications in suchdetails may be made without in any manner departing from the salient features of the invention, and while still retaining the several advantages possessed by the invention.

In the drawings, Figure 1 is a top plan view of the improved screening mechanism with the top plate of one of the screening compartments or chambers removed. Fig. 2 is an end elevation with one-half of the machine shown in vertical section through one of the screening chambers. Fig. 3 is an end elevation of the machine with one-half shown in central vertical section. Fig. 4 is a section through one of the cap plates of one of the screening chambers. Fig. 5 is a detail r Patented Jan. 18, 1910. Serial No. 480,382.

View showing the connection of the screenmg plate of Flg. at, with one of the ends of a screenlng chamber, the parts belng shown 111 v section. Fig. 6 1s a diagram'showing an ar rangement of screen plates approaching but not meet ng at the upper end. Fig. 7 1s a similar view showing the screen plates diverging toward the upper end. Fig. 8 isa similar view showing thescreen plates approaching and meeting at the upper ends. Fig. 91s a structural diagram of an arrangement of the pistons differing from that of the other, forms. y y

In the drawings there is shown a suitable supporting frame composed of two legs 1 each provided with a journal bearing 2 for a power shaft 3. The journal bearings 2 are bolted or'otherwise secured to the legs 1 and are joined by a strut at with the sides and bottom formed in one piece so as to underlie the shaft The strut between the bearings 2 may constitute an oil well for supplying lubricant to the parts carried by the shaft 3,between the bearings 2.1 The shaft 3 is formed with a number of short stroke cranks 5 for a purpose which will presently appear.

Mounted on the legs 1 is a board or plate 6 and secured to this bottom board or plate and to the legs 1 are end members 7 and side members 8 of the tank structure which at an intermediate point is provided with another plate or bottom 9 spaced from and above the bottom member 6. Above the bottom member 9 the tank contains a chamber 10 for the reception of -un'screened paper stock andbelow the bottom 9 and between it and'thebottom 6 there is formed another chamberll for the reception of the screened stock. 7

The bottom member, 6 extends beyond one of the side members 8 and is there provided with side and end members to form a re-.

ceptacle 12 communicating with the chamber 11 through a passage 13 through the lower portion of the corresponding side member 8. ,lVithin the chamber 12 is a baffle 14 over which the screened paper stock mustpass before being permitted to escape from the chamber 12 and the. level of the screened stock Within the'chamber 11 is oletermined' by the height of the baffle .or dam 14:.

The manner of removing the screened paper stock from the compartment 12 beyond the dam 14 forms no part of the present in:

Vention and has not been shown in the drawings. The usual method for this purpose may be followed.

Mounted on the bottom member 9 are pairs of screen plates 15 which may be similar to the ordinary slotted screens commonly used in paper screening machines but these screens difter from those used in the ordinary paper screening machines in that the plates 15 are set on edge either vertically as indicated in Fig. 3, or at an angle one to the other and to the vertical as indicated in Figs. 6, 7 and 8.

Directly on the bottom 9 is a plate 16, or if desired a number of plates, the plate or plates 16 are provided with parallel grooves 17 receiving the lower edges of the screen plates 15.

The upper ends of the screen plates 15 are joined by a cap or cover plate 18 in one face of which are formed appropriate grooves 19 in which the upper edges of the screen plates 15 are seated. The cap plate 18 is strengthened by a central longitudinal rib 20. At each end the screen plates 15 are brought against end plates 21 provided with flanges 22 to which the cap plates 18 are secured by suitable screws or bolts 23. By removing the bolts or screws 23 the cap plates 18 may be lifted ofi the screen plates 15 and the latter may then be removed for cleaning or repairs.

Extending through the bottom 9 coincident with the chambers inclosed by the screen plates 15 are slots or passages 24: in each of which is located an elongated piston 25 fitting the passage 24 quite loosely, there being space of one sixteenth inch more or less between the sides of each piston 25 and the passage 24.

Each piston is carried upon the end of a rod 26 extending through a suitable bearing and guiding sleeve 27 mounted in and extending through the bottom board or plate 6. The lower end of each rod 26 is fast. on a yoke 28 pivoted to one end of a pitman 29 the other end of which is formed with a bearing head 30 encircling a corresponding crank member 5 on the shaft 3.

Fast on the plate 6 so as to be traversed each by a piston rod 26 are a number of packing diaphragms 31 of suitable material, rubber answering the purpose very well. These diaphragms are made to fit tightly on the rods 26 but do not prevent the movement of the rods longitudinally. The diaphragms will give or yield suificiently to permit the very limited longitudinal movement of the rods 26 and this yielding of the diaphragms together with the clinging of them to the rods cause the diaphragms to act as effectual packing to prevent leakage of the screened paper stock which may be contained within the compartment 11.

Through one of the side walls 8 are passages 32 covered by cap plates 33 thus giving access to the chan'iber 1.1 without the necessity of dismantling the structure.

It will be observed that the screen plates 15 with the front supporting structure therefor are shorter than the distance between two side walls 8 and it will be observed that the pairs of screen plates 15 extend alternately from the side walls 8. The pairs of screen plates are thus in alternate or staggered relation thus providing a tortuous passage from one end of the chamber 10 to the other. Power is applied to the shaft 3 by a belt to a pulley 3 1 on said shaft or in any other manner and rotative movement is imparted to the shaft at any desired speed, say for example five or six hundred revolutions per minute. This number is to be taken as illustrative only since the number of revolutions will depend upon the nature of the stock and upon the general requirements and may be many more or less than the number given.

The eccentricity of the cranks 5 will determine the length of stroke of the pistons 25 and this length of stroke may vary from one-eighth of an inch to one-halt of an inch, and may be less than the minimum stated or greater than the n'laximum, the length of the stroke depending also on the nature of the stock and the requirements of the particular material to be screened.

The unscreened paper stock is delivered into the chamber or compartment 10 to a. depth suflicient to cover the screen plates 15 and may be so maintained during the operation of the machine. The action of the phmgcrs 25 is to suck or draw the stock or pulp through the screen plates 15 into the chamber between each pair of plates and the screened stock then finds its way by gravitating' into the chamber 11 through the space between each piston and the passage 21; in which it works, the space, as before stated, being in the neighborhood of 1/16th inch between the sides of each piston 25 and the side walls of the passage 21 and 1/2 inch space may be left between the ends oi each piston and the ends of each passage 21. The screened pulp will ultimately overflow the dam 1 t and may be removed from the compartnimit 12 on the other side of the dam 1a in any proper manner. The height of the dam .14- may be varied as desired so that the depth of stock within the chamber 11 may be greater or less according to circumstances.

Because of the extremely short stroke of the piston rod 2 3 it will be seen that the packing members 31 may if desired be clamped tight to the piston rod and their flexibility will permit the longitudinal movement of the piston rods without putting undue strain on the packing members 31.

With a machine constructed as described the unscreened paper stock may be introd uced at one end of the chamber 1O and will ultimately find its way to the other end. Any suitable means may be employed for the introduction of the unscreened paper stock at one end of the chamber 10 and since ed in the drawings. By the time the paper stock introduced into thechamber 10 has reached the other end of the said chamber nothing but refuse remains and this may be removed in any convenientmanner.

The chamber 11 may as before stated be cleaned by reason of the access permitted through the passages '82-'but water may be 3 introduced for cleaning purposes through a pipe 35, which within the chamber 11 may be perforated so that a stream of water in a finely divided condition. may be directed through the chamber ll for removing any matter therein contained.

It has already been intimated that the vertical position of the screen plates 1 5 is not mandatory and that these screen plates may be at different angles not too far removed from the vertical. In Fig. 6 the screen plates are shown approaching toward the upper end. In Fig. 7 the screen plates are shown as diverging toward the upper end. In Fig. 8 the screen plates are shown as converging toward the upper end and ultimately meeting. These examples Will be suflicient to show that the positions of the screen plates are susceptible of many modifications without departing materially.

from the advantages of having the plates p actically upright instead of lying hor'- Zontally as is the usual custom. The term on edge as applied to the screen plates 15 means therefore that these plates rest upon one edge and rise therefrom though not necessarily vertically, and that the ot-heredge of the plates is higher than the sustaining edge, while the plates are arranged in pairs to inclose a chamber into which the paper stock may flow only after having passed through the screen plates. From the same considerations it also follows that the screen plates may or may not be parallel.

While the pairs of screen plates have been described as extending only part of the way across the chamber 10 it is evident that other arrangements may be provided and that the arrangement of the screen plate chambers within the receiving chamber 10 may be varied as found expedient from the arrangement shown in the drawings.

Instead of having the pistons within the passages through the plate or bottom 9, they may be above this plate and slightly overlap the sides of the passages as shown in Fig. '9,

this arrangement increasing the flow of the material being treated.

It is to be understood that while the invention has been described with relation to I screens'for paper making machmes, the1n-.

vention includes the use of the screen structure for ground wood pulp, or sulfite pulp or soda pulp, or in fact any of the fiber stocks used formaking paper stocks, and the claims are to be interpreted as including such uses of'the'structure. I

What is claimed is l. A screen structure for paper making machineshaving screen chambers formed between screen plates placed on edge, and pistons below the screen plates and chambers formed therebetween. v 2. A screen structure for paper making machines having screen chambers formed by screen plates arranged in pairs and placed on edge, and a top plate or cover for each pair of "screen members, said top plate having grooves receiving theupper edge of each screen plate of a pair of screen plates. A

3. In ascreen structure for paper making .machines, a chamber for receiving unscreened paper stock, another chamber for receiving screened paper stock, a screen chamber communicating with the second named chamber .and located in the first named chamber with screen, plates forming the sides of the screening chamber and set on edge, and a'piston for the screen chamber -between the same and the second named chamber.

4. In-a screen structure for paper making machines, a chamber for receiving un screened paper stock, another chamber for receiving? screened paper stock, a screen chamber communicating with the second named chamber and located in the first named chamber with screen plates forming the sides of the screening chamber and set on edge, a piston; for the screen chamberbetweenthe same and the second named chamber, and means for reciprocating said piston.

5., In a screen structure for paper making machines," a chamber for receiving unscreened paper" stock, another chamber for receiving screened paper stock and communicating with p the first named chamber through asuitable passage, a screen chamber located in the first named chamber above the passage between the two chambers and having its sides formed of screen plates set I on edge, and a piston at the passage between the screening chamber and the chamber for screened paper stock, said piston being spaced from the walls of the passage in which it is located.

6. In a screen structure for paper making machines, a receptacle for unscreened paper stock having passages through its bottom, screen chambers in the receptacle each having walls formed of screen plates set on edge and matching an opening through the bot tomlof said receptacle, a piston for each screen chamber located at the respective pas- &

sage in the bottom of the receptacle and means for reciprocating the pistons.

7. In a screen structure for paper making machines, a receptacle for unscreened paper stock having passages through its bottom, screen chambers in the receptacle each having Walls formed of screen plates set on edge, and matching an opening through the bottom of said receptacle, a piston for each screen chamber located in the respective passage in the bottom of the receptacle and in spaced relation to the walls of such passage, and means for reciprocating the pistons.

8. In a screen structure for paper making machines a chamber for receiving unscreened paper stock, another chamber for receiving screened paper stock, a screen chamber intermediate of the other chambers and communicating with both, a piston between the screen chamber and the chamber for screened stock, a piston rod for the piston extending through the bottom of the chamber and a flexible diaphragm fast to the piston rod and the bottom of said last named chamber and sealing the same against leakage.

In testimony that I claim the foregoing as my own, I have hereto afiixed my signature in the presence of two Witnesses.

JOHN WILLIAM REYNOLDS.

Witnesses WILLIAM RooNEY, MORGAN E. WELSH.

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