US2003753A - Vertically adjustable tables for fourdrinier machines - Google Patents

Description

June 4, 1935- L. 1.. LAPEYROUSE 2,003,753

VEHTICALLY ADJUSTABLE TABLES FOR FOURDRINIER MACHINES Filed June 10, 1932 Patented June 4, 1935 V UNITED STATES PATENT OFFICE VERTICALLY ADJUSTABLE TABLES FOR. FOURDRINIER MACHINES Lawrence L. Lapeyrouse, Mobile, Ala.

Application June 10,- 1932, Serial No. 616,528

2 2 Claims. (01. 92-44) This invention relates to machines for the I 4 is provided with means whereby the slack in making of paper and particularly to machines the wire netting or web may be takenup. The used in making'calipered or fourdrinier board, frame which pp the T0115 is formed that is, relatively thick paper board, this present in two sections hinged to each other at l8 so that invention being an improvement of the structure the forward section extending from the hinge I8 5' shown in Figure 2 of my Patent No. 1,853,625 to the breast roll isrelatively short and the reargranted tome on April 12, 1932. My prior patent ward section extending from the hinge l8 to the described and showed a number of different couch roll I2 is relative y long- This frame forms of fourdrinier machines in which means is carried up n the pp This pp is 10: were shown whereby the making Wire was run mou ted adj its Opp ends upon. jack 10 on an incline for a certain distance from the screws 20 op r in in the Screw-threaded bases breast roll and over the sieve table and was then or sockets zl 7 carried rearward for the remaining part of the The screws 20 may be swiveled to the support distance either in a horizontal plane, an up- I!) and be caused to rotate to vertically adjust Wardly inclined plane or at a declination. The the supp or the bases 2| may be-r-otatable to 15 purpose of this construction was to provide cause the raising or lowering ofthe screws 20. means whereby the stock water could'be rushed AS, befOre Stated, the frame is formed in up over the inclined portion of the wire but at a two sections 11 and IT. The section I! is conpoint where the head pressure was spent, the nected at its forward-endtoa support'22 which is wire was-caused to travel either on a less inclinaattached to the stand 23 for the breast roll I0. 20 tion or in a horizontal plane or ona downwardly The Particular imp which I have and rearwardly inclined'plane to thus prevent lustrated consists in the use-of the twoscrew' the stock water from dragging, this construcjacks 20 disposed beneath the forward and rear tionpermitting a board to be made which would ends of t e supp l9 which support pp the 25 have a high bursting strength and but little long or main section of the frame II. It will be 25 Weight: obvious that by raising the forward end of the The present invention provides means wheresupport [9, an increased angle will be given to by the rear section of the table, formed of two the section-Fl of the wire supporting frame-and sections as disclosed in my prior patent, may thus to the forward'portion'of the wire and that 301 be raised at'both ends or either end, thus making by adjusting the rear screw 20, the rear section it possible to raise one end of the second section of the frame I! with the rear portion of the wire; of the table more than the other if desired and that is, all that portion of thewire rearward of to make it possible to get any angle of the two the hinge l8 may be adjusted. so that the rear sections of the table that it is required to get. section of the table may be disposed at a less A further object is to provide a construction inclination than the forward section Il may be 5 which may be readily used for converting madisposed in a horizontal plane, or may decline chines now in use to include the principles of rearward and downward. Thus it is possible to the invention which are disclosed in my prior get any angle of the twosections of the table dep nt- V I sired and at the same time secure all the advan- My invention is illustrated in the-accompanytageswhich are present in the structure shown in 40' ing drawing, whereinzmy prior patent.

Figure 1 is a diagrammatic side elevation of a It is to be particularly noted that in my confourdrinier machine constructed in accordance struction the suction boxes I5are disposed'at the with my invention; rear portion of the frame l1. This is particularly Figure 2 is a fragmentary'elevation partly in important-as it is necessary that the paper or 45 7 section showing the manner in which the front board formed on this machine acquire bulk and section is mounted upon the supporting arm. a better formation on the short section Ha and In the drawing, there is illustrated diagramthe drag be controlled on the long section I! bematically a fourdrinier in which is provided the fore the paper reaches the suction boxes. This is usual breast roll I6, the couch roll II, the guide particularly important because when the sheet 50 roll l2, the tube rolls l3, the wire rolls l4 and the reaches the suction boxes, it is set and the formasuction boxes l5. The web or sheet of wire nettion cannot be changed. The formation of a ting l6 passes around the rolls l0 and H and sheet of paper is efiected and altered by the flow over the rolls [2 and I3 and over and under the of the stock water and this formation of the sheet rolls It in the usual manner. One of the rolls must be accomplished while there is still enough 55 water left to float the fibre. The, suction boxes act to remove the water from the sheet when there is not enough water left to flow and the water must be drawn out.

In the structure shown in Figure 2 of my prior patent, the forward section or portion of the wire could be inclined upward and rearward but necessarily with that construction the second sec tion or rearward section had to be extended downwardand rearward.

With my present construction, however, the rear section of the wire may be kept in a horizontal plane without regard to the adjustmentof the forward section or it may be disposed at any desired angle to the forward section. Thisstructure is particularly cheap to manufacture and I have found that it makes it possible to convert the ordinary fourdrinier machine into. an adjustable fourdrinier machine as disclosed in. my prior patent.

It will be seen that Iv have provided a sieve table which is inclined at a relatively steep angle for a certain distance from the breast roll but in which the rear portion of the table may be horizontal, inclined upward and rearward at a lesser angle to the forward section of the table or declined, thus enabling the stock water to be rushed up the wire for a part of the distance over the sieve table and then on a less incline or on alevel or on a slight decline over the remainder of the table, thereby preventing the stock water from dragging on the latter part of its journey over the sieve table. By my construction, I can secure a relatively great inclination of that part of the sieve table adjacent the breast roll without having any dragging effect.

It is to be noted that in my structure, the hinge I8 is disposed about one-third the distance from the breast roll to the suction boxes so that the forward section Ila is very much shorter than the rear section II. The forward section Fla is upwardly inclined. On this section, water is forced to rush up this incline due to the head pressure in the stock box. The water, therefore, travels faster over the upwardly inclined section than does the wire [6. At the point 18, the greater part of the water has passed through the wire,

very little water remaining in the layer of pulp on the wire. There is no force or pressure,.therefore, at this point. The small amount of water acting as a drag but there is not enough water to rush downward and, therefore, the water remaining in the sheet acts as a drag. The purpose of the adjustable rear section II, therefore, is to control the extent of this drag. a level rear section does not entirely eliminate excessive drag. It is, therefore, ordinarily necessary to incline the rear section downward just sufliciently to prevent excessive drag and the degree of inclination must be carefully adjusted. Heretofore it was necessary to change the hydration of the stock in order to prevent this dragging of the water on the rear section but to add more water would change the desired qualities of the finished product but by inclining the rear section downward to just the proper amount, any excessive dragging is eliminated without changing the hydration of the stock. The amount of drag de pendsupon the different stocks being handled, some I requiring a great deal of dragging, others only. a very slight drag. Precisely the amount of drag desired can be secured by properly adjusting the section I! and it will be seen that by raising the forward end of the section I1, the forward section l'la may be inclined at any desired angle and that the rear section then may be brought, by adjusting the rear end thereof, either into a horizontal plane, an upwardly inclined plane or a downwardly inclined plane.

I claim:

1. In a fourdrinier machine, a breast roll, a couch roll, a wire extending from the breast roll and couch roll, a sieve table, the sieve table being formed in two sections, the forward section adjacent the breast roll being shorter than the rear section and being pivoted to the rear section at a point between the suction boxes and the breast roll and having table rolls, means for vertically adjusting the forward end of the rear section to thus adjust the inclination of the forward section of the sieve table, and independent means for vertically adjusting the rear end of the rear section of the sieve table relative to the forward end thereof, the rear section carrying suction boxes at its rear portion, and wire supporting rollers from the suction boxes to the point of connection with the forward section. I

2. In a fourdrinier machine, a breast roll and a couch roll, a wire extending around the breast roll and couch roll, a frame extending longitudinally beneath the upper flight of the wire and formed in two sections, the forward section being short relative to the rear section and the forward section extending rearward from the breast roll and being pivoted to the rear section, wire supporting rolls carried by the two sections of the frame, suction boxes disposed in connection with the rear end of the rear section of the frame, means operatively connecting the forward end of the forward section to the breast roll, a support extending longitudinally beneath the rear section of the frame and supporting the same, means for vertically adjusting the forward end of said support to thus adjust the inclination of the forward portion of the frame, and independent means for vertically adjusting the rear end of the support to thus adjust the angle of the rear section to the angle of the forward section of the frame.

LAWRENCE L. LAPEYROUSE.

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