US2251492A - Paper machine press - Google Patents

Description

1941- I B. ALMALKIN 7 2,251,492

PAPER MACHINE PRESS Filed Aug. 19, 1937 w 2 Sheets-Sheet 1 INVENTOR BERNARM-MALKIN ATTORNEY Patented Aug. 5, 1941 v UNITED, STATE PATENT OFFICE. 1

8 Claims.

This'invention relatesto presses for paper 7 making machines and comprises a three roll press in which the rolls are arranged .in triangular formation and in which one roll, preferably the first bottom roll, is a suction roll.

The invention also comprises a three roll press inwhich the three rolls are assembled in triangular formation so that adjustments may be readily made to effect any desired distribution of the nip pressure between the top roll and the two bottom rolls.

One objection to the conventional three roll press in which the rolls are arranged in triangular formation is the trapping or accumulation of water in front of the nip between the top roll and the first bottom roll. Another ob-v jection is the lack of convenient and satisfactory means for effecting the most desirable distribution of the nip pressure between the top roll and the two bottom rolls. According to the present invention the'first objection is overcome'by making either the first bottom roll or the top roll a suctionroll through which the water pressed from the sheet is rapidly removed to prevent the usual accumulation of water in'front of the first nip of the press. The second objection is preferably overcome by applying pressure to the top roll bearings through adjustable pressure distributing links in which said bearings are suitably mounted.

Proceeding now to a more detailed description reference will be had to the accompanying drawv ings, in which- Figure 1 is a more or less diagrammatic side elevation of a three roll press designed in accordance with this invention. 1

Figure 2 is a view, similar to Fig. 1, but showing the pressure distributing links shifted to a different position to increase the nip pressure between the top roll and the second bottom roll? Figure 3 is a longitudinal sectional view-"of the link adjusting means provided in accordance with this invention.

Figure 4 is a top'plan view of the assembly appearing in Fig. 3. A

Figure 5 is a diagram illustrating the manner in which the nip pressure between the top roll and the two bottom rolls is varied by adjustment of the pressure distributing links.

Figure 6 is a diagram showing aslight modification of the .nip pressure distributing means.

In these drawings the press, rolls and their bearings are shown diagrammatically since'these elements may be of any suitable design. The

.two bottom press rolls 5 and 6 are journalled in bearings I and 8 on the frame 9., The first bottom roll 5 is a suction roll which may be of any suitable design and serves, in addition to its pressing function, as a convenient means for" quickly removing the water pressed from g, the

paper web during its passage through the first nip of the press. The first and second press felts are shown at l0 and II. These felts are trained around the press rolls 5 and 6 and are guided and tensioned by the usual arrangement of guide and stretcher rolls.

The top press roll I2 is positioned between and rests upon-the bottom rolls 5 and 6. The top roll is carried between the lower ends of a pair of pressure distributing links l3 (only one of which is shown) having their upper ends pivotally connected toysleeves H slidably mounted on the tubular ends l5 of the pressure applying levers l6. As here shown each lever I 6 is intermediately pivoted, as at II, to a bracket I8 rls' ing from the frame 9 adjacent the suction roll 5. The endlQ of each lever is forked to pro-'- vide arms 2|| embracing a threaded bolt 2| having its lower end pivoted, as at 22, to one of A spring 23 is arranged on e the brackets la. the bolt 2| between a spring seat 24 engaging the fork arms 20 and a second spring seat 25 j supported on a ratchet nut 28 which is adjusted vertically on bolt 2| by means of the ratchet lever 21. By turning the levers 21 in the proper direction the upward pressure of the springs 23 on the forked ends of .the levers f|6 may be adjusted to regulate the spring load on the top press roll A fol-lower 29 is slidably mounted on the rip-- perportion of each bolt 2| and is provided with depending projections 30 having their lower ends rounded to seat in rounded recesses 3| provided in the fork arms 20 of the lever IS. A ratchet nut 32 is fitted on each bolt 2| above the follower 29 and is operated by the ratchet lever 33. When it is desired to raise the top press roll l2 clear of the bottom rolls 5 and 6 the ratchet levers 33 are operated to force the'nuts 32 and the followers 29 downwardly against the forked end of the levers It, thus raising the tubular ends I5 from which the top roll I2 is suspended by the links. The spring loading attachment may be readily disconnected from lever I6 by raising the follower 29 out of engagement with the recesses 3| and then swinging the bolt 2| to the i left clear of thefork arms 20. I

The tubular end l5 of each lever I6 is provided with a longitudinal slot 35 and is closed at its outer end by a threaded cap member 36.

, pressure along AC A rotatable adjusting screw 3?! extends through the tubular member at; and through a nut 38 which is carried by the sleeve it and works in to the cap 36 by means of the hand wheel 40 and a collar 4| which is fixed to inner side of the cap.

The top roll 12 is suitably journalled in the lower ends of the links l3 so that these links may be turned about the axis of the top roll to assume either a vertical position, as shown in Fig. 1, or a suitably inclined position as shown, for example, in Fig. 2. Each link includes a pair of arms 42 which are pivotally attached to trunnions 43 projecting outwardly from opposite sides of the associated sleeve M. The upper end of each arm 42 is provided with a split bearing 44 in which the trunnions 43 are rotatably secured by the clamping bolts 45.

In the use of this invention the external force applied to the top roll l2 by the spring loaded levers I 6 is regulated by a suitable adjustment of the ratchet nuts 26. The distribution of the nip pressure between the top roll and the two the screw at the bottom rolls is determined by the position to which the upper ends of the pressure, distributing links l3 .are shifted by turning movement of the hand wheels 40. When the links are in the position shown in Fig. 1, the nip pressure between the top roll and the first bottom roll will be, the same as the nip pressure between the top roll and second bottom roll. When, however, the links are shifted to the inclined position shown in Fig. 2, the nip. pressure between the top roll and the second bottom roll will be greater than the nip pressure between the top roll and the first bottom roll. This will be clear from the diagram and legends appearing in Fig. 5.

In describing the action of the nip pressure distributing system it may be pointed out that pressure applied to the pressure levers I6 is re- .solved into (1) pressure on the fulcrum pin l1 (Figs. 1 and 2), or the fulcrum point (Fig. 5), i. e., along the line P. 0., and (2) pressure along the direction in which the links l3 (Figs. 1 and 2) are set, i. e., along the line P. A. The pressure along line P. O. has no effect on the rolls. The total pressure distributed between the two bottom rolls 5 and 6 (Fig. 5) consists of the weight oi the top roll l2 and the pressure along 'the line A. C. If the length of the lines AB and AC represent the weight of the top roll and the respectively, then the range of the line AD will represent the result of these two pressures.

This resulting pressure is balanced by reactions along the lines joining the centres of the rolls 5 and I2 and 6 and 12 so that resolving the pressure AD along these lines gives a reaction represented by AF between rolls 5 and I2 and reaction AE between rolls 6 and [2.

Obviously the relation between AF and AE may be changed by moving the fulcrum point P (Fig. 5). If the point P is at position R, i. e., directly over the centre of the top roll, the reactions will be equal. If P is shifted to the left of position R, AE will. be greater than AF. If P is shifted to the right of position R, AF will be greater than AE.

In Fig. 6 the line AX represents the horizontal component of the pressure exerted by the spring 49 while line AD represents the resultant total pressure.

In Fig. 6, I have shown a modified application of the principles of this invention. In this case the top press roll is carried between the lower ends of a pair of intermediately pivoted links 41 only one of which is shown. Each link 41 is pivoted to. the pressure applying lever IE to swing about a fixed fulcrum '48. A spring 49, connected between the upper end of the link and the lever l6, tends to swing the lower end of the link to the right and thus causes substantially horizontal pressure to be applied to the top roll bearings in the direction of the second bottom roll so that the nip pressure between the top roll and the second bottom roll is greater than the nip pressure between the top roll and the first bottom roll.

Any suitable means may be provided for adjusting the 'eifective action of the spring 49 or such spring may be replaced by other means for performing the same function.

It is not absolutely essential that the first bottom roll be a suction roll since the same efiect, in respect to preventing accumulation oi. water ini'ront of the first nip of the press, may be realized by using a suction roll as the top press roll. So far as I am aware, it is new t provide a three roll press of the triangular type in which either the first bottom roll or the top roll is a suction roll. Consequently, insofar as this feature of my invention is concerned, I may employ in connection therewith various means other than the means previously described for regulating the distribution of the nip pressure. As it is usually desirable for the nip pressure between the top roll and the second bottom roll to be higher than between the top roll and the first bottom roll, the second bottom roll can be located at a lower level than the first bottom roll. Another alternative method of distributing the pressure as desired would be to make the second bottom roll adjustable vertically. While it is usually desirable to have the nip pressure between the top roll and second bottom roll greater than the pressure between the top roll and the first bottom roll, it will be understood that the pressure distributing means disclosed in Figs. 5 and 6 may be arranged to give a greater nip pressure between the top roll and the first bottom roll than between the top roll and the second bottom roll whenever this is desirable or necessary.

These and other desirable modifications are contemplated as falling within the scope and spirit of the invention as defined by the appended claims. I

Having thus described my invention, what I claim is:

1. A press for! paper making machines comprising a top roll and two bottom rolls arranged in triangular formation with the top roll bearing on the bottom rolls, a pair of loaded pressure applying levers mounted to swing about a common horizontal axis located at one side of the top roll, a pair of nip pressure distributing links suspending the top roll from said levers, each link having its lower end connected to the roll so that the upper end of the link is shiftable about.an axis coinciding with the longitudinal axis of said roll and means slidably and pivotally connecting the upper end of each link to one of said pressure applying levers.

2. A press for paper' making machines com- 6. A press for paper making machines comprising a toppress roll and two bottom press rolls arranged in triangular formation so that *the top roll rests on the bottom rolls, a pair of sliding said sleeves to different positions of adjustment longitudinally of said levers.

3. A press for paper making machines comprising a top. press roll and two bottom press rolls arranged in triangular formation so that the axis of the top roll lies above and between the axes of the bottom rolls, a pair of vertically disposed nip pressure distributing links carrying the top roll in bearings provided at the lower ends thereof, vertically movable force applying means to which the upper ends of said links are pivotally connected, said force applying meansacting through and lengthwise of said links to accentuate the nip pressure between-the top roll and the two bottom rolls and being operable to raise the top clear of the bottom roll and means for swinging said links to diiferent angular posi tions about an axis.coinciding with the axis of the topliftill, the pivotal connection between the links and the force applying means being such as to permit the aforesaid swinging'of the links.

4. A three roll press for paper making ma? chines comprising a top;roll and two bottom 'rolls arranged in triangular formation with the top roll bearing on the bottom rolls, vertically movable pressure applying means located above said top roll and a pair of adjustable pressure distributing links through which the pressure of said pressure applying means is transmitted to said top roll, said links being pivotally connected to said top roll and to said pressure applying mean whereby said links are adjustable to various angular positions about a pivotal axis coinciding with the axis of rotation of said top roll.

5. A press for paper making machines comprising a top press roll and two bottom press rolls arranged in triangular formation with the top roll bearing on the bottom rolls, a pair of loaded pressure applying levers mounted to swing about a common horizontal axis located at one side of the top roll, said levers extending transversely across the rolls so that they overlie prising a top press roll and two bottom press rolls arranged in triangular formation with the top roll bearing on the bottom rolls, a pair of loaded pressure applying levers intermediately' pivoted to swing about a common horizontal axis located at one side of the top roll, said levers being arranged so that one end of each lever overlies the top roll while the other end is disthe ends of the top roll, sleeves slidably mounted on said levers, sleeve adjusting screws rotatably 'carried by said levers and having threaded engagement with said sleeves and a pair of pivotal.

links having their upper ends pivoted to said sleeves and their lower ends pivotally connected to said top roll for swinging movement about the central axis of said roll, said links serving to transmit pressure from said lever to'said top roll to accentuate the nip pressure between the several rolls.

posed to one side of said roll, means for exerting upward pressure on the ends of the levers which are disposed to one side of the top roll and pressure transmitting connections through which downward pressure is transmitted to the top roll from the ends of the levers overlying said roll, said connections comprising pressure transmitting links having their upper ends pivoted to said levers and their lower ends pivoted to the top roll, said links being inclined from the vertical so that the line of action of the pressure transmitted through said'links is such'that the nip pressure between the top roll and one of the bottom rolls is greater than the nip pressure between the top roll and the remaining bottom rolls. V

7. A three roll press for paper making machine comprising atop press roll and two bottom press rolls arranged in triangular formation with the top roll bearing on the bottom rolls, a

' frame provided with bearings in which the bottom press rolls are journaled; brackets extending upwardly from the frame adjacent the firstbottom roll, horizontally extending levers intermediately pivoted to said brackets so that one end of each lever overlies the top press roll while the other end lies at the side of. the bracket remote from said rolls, means for exerting upward pressure against the last mentioned ends of the levers and pressure transmitting connections between the iirst mentioned ends of the levers and the top roll, said pressure. transmitting connections comprising links, each having its lower end npivoted'to the top roll and its upper end pivoted to the adjacent end of one 'of said levers.

' 8. Alpress roll for paper making machines I comprising a top press roll and two bottom press portion and having threaded connections with said screw, and pressure distributing links con-- nected between-saidsleeves and the ends of the top roll, each link having its lower end pivoted to the top roll so as'to be capable of turning movement about the central axis of said roll. and having its upper end pivoted to said sleeve, and I meansior applying upward pressure to the ends of the levers remote from the ends overlying the top roll.

' BERNARD A.

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