CA1171709A - Support and control means for the upper lip part of the headbox in a paper machine - Google Patents

Abstract

ABSTRACT OF THE DISCLOSURE

A box-type cantilever beam extends above the upper lip wall of the slice of the headbox of a paper machine. A control device on the front wall of the cantiliver beam, and coupled to the upper lip wall, controls the position of the upper lip wall in a vertical plane. The upper lip wall has a rear pivot in opera-tive relation with a slide arrangement which controls the position of the upper lip wall in directions in the plane of the upper lip wall and perpendicular to the direction of positioning by the con-trol device.

Description

11717(~!~

BA.CKGROUND OF THE INVENTION
The present invention relates to support and control apparatus for the upper lip wall of the slice of the headbox of a paper machine. In such a headbox, the upper lip wall defining with the lower lip wall the conical lip part is attached at its rear part to the headbox structures via a transverse pivot. The apparatus includes members which control the position of the up-per lip wall substantially in the direction of its plane and mem-bers which control the position of the upper lip wall in a plane substantially perpendicular to the last-mentioned direction.
As known in prior art, the upper lip structures of the headbox consist of an upper lip beam, which is a box-type beam and has a substantially planar lower side. The upper lip beam is at the rear part of the conical lip part of the slice of the headbox integrally pivoted to the displaceable slide structures of the headbox. The part of the upper frame to which the upper lip beam is pivoted, and which is usually located above a turbu-lence generator in the headbox, such as, for example, a lamel-lated part, is provided in its entirety as a displaceable slide 1.~7~7(P~

structure, when wo~n transmissions or the equivalent are used.
A plurality of displacement rods are provided between the dis-placeable slide structure and the upper lip beam. The upper lip beam is turnable about its povit attachment. The displacement rods are parallel to the machine direction and are actuated by a worm transmission or tranmissions, and swivel the upper lip beam about its pivot attachment. Since the height of the slit of the lip is controlled by turning the upper lip beam about its pivotal attachment, the horizontal positioning of the lip plate with reference to the wire will also change.
Since the stock suspension flow passage in the conical lip portion usually presents a downwardly turning angulation, it becomes necessary to locate the displaceable slide structure above the turbulence generator in a position such that when this frame structure is linearly displaced, the height of the slit of the lip will also change.
German Published Patent No. 2,607,822 discloses the state of the art.

1t'~ 17~P9 SU~ll`lARY OF THE INVENTION
The principal object of the invention is to provide support and control apparatus for the upper lip wall of the slice of the headbox of a paper machine, which apparatus is simpler in structure than that of the prior art, less expensive in imple-mentation, and is free of the drawbacks of the known apparatus.
Another object of the invention is to eliminate the operating trouble caused by the management of forces, and by thermal expansion, in the upper lip structure of slices of head-boxes of the prior art such as, for example, applicant's "SYM-NOZZLE" (a trade mark).
Still another object of the invention is to provide a headbox for a paper machine which is more reliable in operation than known headboxes with regard to savings gained due to its structural embodiment.
Yet another object of the invention is to provide sup-port and control apparatus for the upper lip wall of the slice of a headbox of a paper machine, which apparatus provides a floating upper lip wall having a linearity unaffected by thermal expansion, due to thermal-responsive slidable mounting of the upper lip wall.
Another object of the invention is to provide support and control apparatus for the upper lip wall of the slice of a headbox of a paper machine, which apparatus adjusts the slit of the lip exactly and in a single motion and constantly in horizon-tal displacement, with no change in the slit introduced by the slant of the rear pivot and no correction of the vertical adjust-ment necessary.

1 ~7.1'709 Still another object of the invention is to provide support and control apparat~s for the upper lip wall of the slice of a headbox of a paper machine, in which apparatus the linearity of the lip wall is constant in the cross-machine direction, due to the support of both the front and rear pivots in continuous plan--ar supporting action, thereby avoiding deflections resulting when point supports are used.
Yet another object of the invention is to provide sup-port and control apparatus for the upper lip wall of the slice of a headbox of a paper machine, which apparatus provides an accur-ate and inexpensive vertical control by utilizing only a single gearbox, whereas two to eight gearboxes are utilized in known ap-paratus, and thereby providing considerable savings in large, high-speed paper machines.
Another object of the invention is to provide support and control apparatus for the upper lip wall of the slice of the headbox of a paper machine, which apparatus produces an accept-able output immediately upon being started, there being no delay in production due to the start warmup period and the flow and transversal profiles being constant under all conditions.
In accordance with the invention, support and control apparatus for the upper lip wall of the headbox of a paper machine comprises a cantilever beam, preferably a box-type beam, which ex-tends above the upper lip wall of the headbox. An adjustment de-vice in operative relation with the front wall of the cantilever beam controls the position of the upper lip wall in a vertical 1.2. ';' ~.7c~

plane. The adjustment device is indirectly or directly coupled to the upper lip wall. The upper lip wall has a rear pivot in operative relation with a slide arrangement or equivalent. The slide arrangement or equivalent controls the upper lip wall in directions in its plane and substantially perpendicular to the direction of positioning by the control device.
BRIEF DESCRIPTION OF THE DRAWINGS
For a fuller understanding of the invention, reference is had to the following description, taken in connection with the accompanying drawings, in which:
Fig. 1 is a sectional view, taken in a vertical section of the machine direction, of an embodiment of the support and control apparatus of the invention for the upper lip wall of the slice of the headbox of a paper machine;
Fig. 2 is a sectional view, taken in a vertical section of the machine direction, of another embodiment of the support and control apparatus of the invention for the upper lip wall of the slice of the headbox of a paper machine;
Fig. 3 is a sectional view, on an enlarged scale, taken along the lines III-III, of Figs. 1 and 2;
Fig. 4 is a sectional view, on an enlarged scale, taken along the lines IV-IV, of Figs. 1 and 2;
Fig. 5 is a sectional view, on an enlarged scale, taken along the lines V-V, of Figs. 1 and 2;

~. I '7 17~P9 Fig. 6 is a sectional view, on an enlarged scale, taken along the lines VI-VI, of Fig. 3;
Fig. 7 is a sectional elevation, taken in a section pa-rallel to the machine direction, of a first embodiment of the sup-port and control apparatus of the invention for the upper lip wall of the slice of the headbox of a paper machine;
Fig. 8 is a sectional elevation, taken in a section pa-rallel to the machine direction, of a second embodiment of the sup-port and control apparatus of the invention for the upper lip wall of the slice of the headbox of a paper machine;
Fig. 9 is a front view, on an enlarged scale, partly cut away and partly in section, of the front plate displacing device of the embodiments of Figs. 7 and 8;
Fig. 10 is a sectional view, on an enlarged scale, taken along the lines X-X, of Fig. 9;
Fig. 11 is a sectional view, on an enlarged scale, taken along the lines XI-XI, of Fig. 9;
Fig. 12 is a sectional elevation, taken in a section parallel to the machine direction, of a third embodiment of the support and control apparatus of the invention for the upper lip wall of the slice of the headbox of a paper machine;
Fig. 13 is a sectional view, on an enlarged scale, taken along the lines XIII-XIII, of Figs. 7 and 12;
Fig. 14 is a sectional view, on an enlarged scale, taken along the lines XIV-XIV, of Fig. 7;

l t '717(~9 Fig. 15 is a sectional view, on an enlarged scale, ta-ken along the lines XV-XV, of Fig. 12;
Fig. 16 is a sectional view, on an enlarged scale, ta-ken along the lines XVI-XVI, of Fig. 15; and Fig. 17 is a sectional view, on an enlarged scale, ta-ken along the lines XVII-XVII, of Fig. 15.
DESCRIPTION OF PREFERRED EMBODIMENTS
As shown in Figs. 1, 2, 7, 8 and 12, the lower lip struc-ture of the slice of the headbox, and therethrough the whole head-box, is carried on a stand 10 to be displaceable as an entity viaa worm gear 11. The displacement rods connected to the worm gear 11 are attached to flanges 12, in contiguity with which a lower beam 20 of the headbox is carried by adjustment of flanges 14.
It is possible, by operating the worm gear 11, to control, in a manner known in the art, the position of the headbox with refer-ence to a breast roller 24 and a wire 25, as an entity.
As shown in Figs. 1, 2, 7, 8 and 12, the headbox sup-pies pulp stock through the slit L of the slice onto the wire 25 passing over the breast roller 24. The flow path of the stock through the headbox, starting at the distribution header (not shown in the drawings), consists of a distribution pipe system 15, and an equalizing chamber 16 following thereafter, adjacent to which is an air container or tank 17, 17' serving to allay the pressure fluctuations in the pulp stock. The pressurized air volume V in the 11~717~9 air tank 17,17' communicates immediately with the free surface S
of the stock. The level of the free surface S is determined by a weir and an overflow tube 18 thereunder.
A turbulence generator 21 follows the equilizing cham-ber 16 in the stock flow path. The turbulence generator 21 is a lamellated component of the type, for example, disclosed in Finnish Patent No. 50,260. The turbulence generator 21 is suc-ceeded by a conical lip part 23, which is slightly turned down and terminates in the slit L. The lower part structure of the headbox consists, in a manner known in the art, of beams 19 and 20, their upper wall confining the pulp suspension flow path in or at the equializing chamber 16 and turbulence generator 21. A
lower lip beam 22is connected to the vertical wall of the beam 20.
The lower lip beam 22 is stationary, confining by its top wall the lower part of the conical lip part 23.
As shown in Figs. 1, 2, 7, 8 and 12, the top-structure of the headbox consists of the box-type beam 26,26', which is of the same width as the headbox. The beam 26, 26' is connected at its lower part to the structures carrying the air tank 17. A
space remains under the beam 26, 26' and above an upper lip wall 27. The upper lip wall 27 is supported and controlled by the ap-paratus of the invention. The supports and adjustment controls for the upper lip wall 27, hereinafter described in structure and operation, are accommodated in the space above said lip wall.
As shown in Figs. 1 and 2, the upper lip wall 27 is 11 ~17Q9 provided, in order to adjust the height of the slit or aperture L and the horizontal position of said slit or aperture, with the control apparatus of the invention. The control apparatus of the invention adjusts the upper lip wall 27 r firstly, substantially in the direction of its own plane, or substantially in horizontal direction, via a first slide device 50, and vertically via a se-cond slide device 30. The slide devices 30 and 50 are operable by power means known in the art (not shown in the Figs.), inde-pendent of each other so that all desired various adjustment com-binations of the lip may be provided.
The slide device 30, which effects the adjustment ofthe upper lip wall 27 substantially in vertical directions, rests against a front wall 29 of the box-type beam 26. The box-type beam 26 is a cantilever beam extending forwardly in the direction of flow F in the headbox and carried at its rear part in conti-guity with the structures carrying the air tank 17. The front wall 29 of the cantilever beam 26 has a groove, into which a slide 31 is fitted. The structure of the slide is shown in Fig.
3. The slide 31, which is displaceable in its longitudinal direc-tion, for example, by means of a worm gear mechanism, has a plur-ality of grooves 32 inclined with the direction in which the slide is movable.
Projecting parts 33 of sliding bodies 36 are fitted ir.to the grooves 32. The sliding bodies 36 move in their housings 34, affixed by screws 35 to be contiguous with the wall 29. The 3~

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sliding bodies 36 have connecting parts 37 in their lower part.
Control screws 39 are affixed to the connecting parts 37 via pi-vot pins 38. The lower parts of the control screws 39 are affix-ed to the upper lip wall 27 by pivot pins 40. The latter attach-ment is made, as shown in Fig. 1, substantially at the center of the upper lip wall or plate 27 in the direction of flow F in the headbox and, as shown in Fig. 2, at the front edge of said upper lip wall or plate.
As can be seen in Fig. 3, there are a plurality of con-trol screws 39 and connecting parts thereof, arranged in parallel with each other, whereby a sufficiently uniform support of the up-per lip wall 27 in the cross-machine direction is achieved.
The slide device 30 operates as follows. As the slide 31 is displaced via the power means in its longitudinal direction, the projecting parts 33 slide in the grooves of said slide. The supporting components 37, 38, 39 and 40 move in vertical directions and the upper lip wall 27 is caused to rise or descend, simultan-eously turning on the pivot 45 of its rear edge.

The control screws 39 are turnbuckles and consist of a sleeve-like part with internal threads and of two threaded pins entering this sleeve and having different-handed threads, so that it is possible, by rotating the sleeve parts, to lengthen or shor-ten the vertical supporting parts. In this manner, the vertical sectoral adjustment of the slit L is feasible. Fine li7~7(~

adjustment is accomplished by using a plurality of screws 42 arranged parallel to each other. The screws 42 displace the lip plate 27 and the connecting part 43 is the adjuster.
The adjustment of the upper lip wall 27 in its plane is accomplished by the slide device 50, which is disposed in conjunc-tion with the rear pivot 45 of said upper lip wall. The slide device 50 consists of a slide 53 fitted to move in the groove of a supporting flange 51 constituting the extension of the lower wall 28 of the cantilever beam 26. The structure of the slide 53 is shown ;n Fig. 4. The slide device 50 is similar to the slide device 30. The elongated slide 53 has a plurality of grooves, or apertures, 54 positioned obliquely with respect to its longitu-dinal direction. A projecting part 55 of a body 56 slides in the grooves 54 (Fig. 5). The slide body 56 is affixed by screws 60 to a pivot housing-supporting piece 59, which, together with the sliding body 56, defines the turning housing for the rear pivot 45 of the upper lip wall. The sliding body 56 carries projecting parts 57, which rest over screws 61 against guides 58 affixed to the flange 51.
The slide device operates as follows. When the slide 53 is moved by the power means (not shown in the Figs.), the projec-ting parts 55 move in the grooves 54 of said slide. The sliding bodies 56 and the parts integrally affixed thereto then slide in their guides 58, and the housing of the rear pivot 45 of the upper lip plate 27 simultaneously displaces said upper lip plate in its 1 i717~9 plane. At the same time, the vertical supporting devices of the upper lip wall 27 are free to turn about their pivotal points 38 and 40, so that on displacement of said upper ]ip wall in the direction of its plane, or substantially horizontally, the verti-cal position of said upper lip wall 27 is not changed to any substantial or detrimental degree.
As shown in Fig 1, the cantilever beam 26 is a component separate from the air tank 17, although the air tank rests at the rear edge of the beam, as seen in the direction of flow F of the stock suspension, on the same supporting structures as the front part of said tank As shown in Fig. 2, the cantilever beam 26' and air tank 17' are constructed as one integrated structure.
The air tank 17' has planar sheet walls, on top of which the upper wall of the cantilever beam 26' is affixed, as shown in Fig. 2. In this manner, a comparatively light-weight cantilever beam 26' achieves a sturdy construction for both the air or dam-ping tank 17 and the cantilever beam 26 and results in favorable support of the loads.
In the described embodiment examples, both slides 30 and 50 are carried on the cantilever beam 26, 26'. The vertical adjusting means 30 of the upper lip wall or plate 27 of the head-box rests again~t the front wall 29 of the box-type beam 26 and the slide 50 rests against the lower edge of the lower wall 28 of said box-type beam, so that said upper lip wall remains below the cantilever beam 26 and its wall 28. It is possible, within the l ~t7~7~9 scope of the invention, to carry the slide 50 of the rear pivot 45 of the upper lip wall 27 equally well on structures other than the box-type beam 26. However, thevertical adjustment slide 30, or other equivalent vertical adjustment means, is carried to grea-test advantage on the front part.
In the foregoing, the vertical and horizontal control devices of the upper lip wall 27 are disclosed as being slide de-vices 30 and 50. It is however, possible, within the scope of the invention, to provide these adjustments in many other ways as well such as, for example, by utilizing gear wheels, tooth racks, or other equivalent mechanical elements.
Although the foregoing description is concerned with horizontal adjustment, or control, and vertical adjustment, or control, of the upper lip wall 27, it should be noted that in those headbox structures of which the lip part 23 is inclined with reference to the horizontal plane, the directions of motion of the aforedescribed control devices are also inclined at an equivalent angle with the vertical and horizontal planes.
In the embodiment of Fig. 7, the upper lip wall 27 of the headbox is at its rear part affixed via a pivot 128 to a slid-ing or slide part 130. The rear pivot 128, and simultaneously the upper lip wall 27, are thereby carried. The upper lip wall 27 is thus enabled to position itself in connection with both vertical and horizontal control thereof. The height of the slit L is vertically adjusted by displacing a front plate 138 in a plane 7:1~05~

rl-Tl in association with its supporting beam 133. The support-ing beam 133 carries a flange 132a at its central part and a flange 132b at its upper part. The flanges 132a and 132b are con-nected by slide fits 134 and 135 with planar, mating sliding sur-faces of the box-type beam 26.
The supporting beam 133 is displaced by adjustment of its flange 132a with the aid of a worm gear 136, using rods 137, of which there are, for example, two, in parallel with each other, acting at the so-called Besselian points in the transverse direc-tion of the headbox. The displacement of the supporting beam 133is effected as a translatory motion in the direction of the slid-ing surfaces 134, 135. In connection with this displacement, the rear pivot 128 of the upper lip wall 27 is enabled to move in its sliding part 130. The top of the sliding part 130 abuts the flange of the box-type beam 26 and the bottom of said part abuts an L-shaped beam affixed from the outside to be connected with said box-type beam. The worm gear 136 is used to control the lo-cation of the slit L with reference to the wire 25 and the breast roller 24 mainly in horizontal direction. In accordance with the invention, the height of the slit L in the direction of the plane Tl-Tl is substantially constant as the horizontal adjustment is being made.
Fig. 7 shows a parallel front plate 138 in sliding con-tact with the supporting plate 133. The top flange of the front plate 138 has a plurality of control rods 142 affixed to it. The 11717~9 rods 142 have, at their top ends, handwheels for fine adjustment of a lip plate 143 and of the transverse profile of the pulp sus-pension jet.
The lip plate 143 is affixed in a manner known in the art, to the front edge of the upper lip wall 27 and in conjunc-tion with its control rods 142. The front part of the upper lip wall 27 also has a pivotal part 129 equal in width to the entire upper lip wall and closed with a sheet component 139 in conjunction with the front plate 138.
As shown in Fig. 8, the front pivot 129' of the upper lip wall 27' is not fully in register with the slit L and is, in-stead, located in the central area of said lip wall. Furthermore, as shown in Fig. 8, the front plate 138' is affixed by screws 156 and by holes which are elongated in the vertical direction in con-junction with the supporting plate 133. Supporting structures 144 are affixed to the front side of the supporting plate 138'. Con-trol spindles 142 for the lip plate 143 are affixed to support the structures 144. As shown in Fig. 7, the sliding surfaces 134 and 135 of the supporting structure 132a, 132b and 133 are substan-tially parallel with the upper run of the wire 25, so that hori-zontal displacement of the upper lip wall via the worm gear 136 has no effect on the height of the slit in the plane Tl-Tl. Fig.
8 reveals that the direction of the sliding surfaces 134' and 135' is inclined slightly obliquely upward, relative to the direction of the upper run of wire 25. This is meant to compensate for l t717(~9 the error introduced by the fact that the foremost pivot point 129' of the upper lip wall 27' is not located at the very front end of said upper lip wall. Thus, as the vertical position of the supporting beam 133 is controlled in the plane T2-T2 via the device 140, the position in the horizontal direction of the lip plate 143 will not change to any detrimental degree. This is due to the fact that, due to the placement of the pivot 129', the lip plate 143 affixed to the upper lip wall 27' moves through a very shallow arc, while the rear pivot 128 is simultaneously enabled to move in its slide 130.
The vertical control system 140 for the upper lip wall 27, for changing the vertical position of the front plate 138 with reference to-the supporting beam 133 to adjust the height of the lip slit L, is described with reference to Figs. 9, 10 and 11.
The control system 140 provides vertical control in the vertical plane Tl-Tl in Fig. 7, in the vertical plane T2-T2 in Fig. 8, and in the vertical plane Tl-Tl in Fig. 12. The control device 140 comprises a slide 154 such as, for example, a bronze slab, dis-posed to move in a horizontal groove of the supporting beam 133, 133'. The horizontal linear motion of the slide 154 is produced with the aid of a worm gear transmission 152, which is rotated by an input shaft 151. The displacement rod o~ the worm gear 152 is affixed by pins 153, or the equivalent, to one end of the slide 154. The slide 154 has a plurality of uniformly spaced oblique grooves 157, at an angle ~ with the longitudinal direction of J ~717(39 said slide (Fig. 9). Pins 155 are mounted ad~acent the oblique grooves 157 on the supporting plate 138. The pins 155 are inte-grally affixed to the supporting plate 138 via an outer~ broader flange. The sides o~ the other end of the pins 155 are removed by machining, so that a projecting part 158 is formed which enters the respective oblique groove 157 of the slide 154 and fits into said groove.
When the worm gear 152 is operated to move the slide 154 in its groove, in its longitudinal direction, the projecting parts 158 slide in the grooves 157 of said slide and force the supporting plate 138, 138' to move vertically. To accomplish this, the sup-porting plate 138, 138' is affixed via vertically elongated holes 1~9, stepped sleeves inserted in said holes, and screws 156, in contiguity with the supporting plate 133.
In the aforedescribed manner, an upper lip vertical control apparatus is provided which permits the raising and lowe-ring of the upper lip structure with exceedingly high accuracy with minor force, while maintaining its direction and linearity under varying operating conditions.
As shown in Fig. ]2, the upper lip wall 27 is carried by its pivot 129 on the front wall 138', which in its turn is dis-placeable-via the control device 140 with reference to the suppor-ting plate 133'. The supporting beam 133' deviates from that of Figs. 7 and 8, and has a T-shaped cross-section, comprising a flange 132' affixed close to the lower part of said supporting 17~

plate and having in its connection sliding surfaces 134' and 135' serving the aforedescribed purpose. The flange part 132a in Fig.
7, the flange part 132 in Fig. 8 and the flange part 132' in Fig. 12 are affixed to the front plate 133, 133' in a manner whereby S they are displaceable in the longitudinal direction of the headbox at a point such that no torsion is encountered in connection with the displacement of said front plate.
Fig. 13 displays the implementation of the slide fits 134, 134', ~35. A sliding plate 160 is fitted in conjunction with the planar lower face of the box-type beam 126. The horizontal flange part 132a, 132b, 132' of the supporting plate 133, 133' is affix~d by screws 162 to be connected to the box-type beam 26. The screws 162 are encircled by sliding sleeves 161, each having an end flange. The end flanges of the sleeves 161 support the flange parts 132a, 132b, 132' by adjustment of the sliding plane 163. The slide fit constituted by the screw 162, the sleeve 161 and the sliding plane 163 permits the flanges 132a, 132b, 132' to be moved via the power means 136, 137 in the aforedescribed manner. The screws 162 have a threaded portion 164, by which the screws are affixed to the lower wall of the box-type beam 26. The sleeve parts 161 are disposed in holes 180 in the flange parts 132a, 132b, 132'. The holes 180 are elongated in the direction of movement of the flange parts.
As shown in Fig. 14, the slide 130 in conjunction with the rear pivot 128 of the upper lip plate 27 consists of a sliding 1~7~7~9 body 166 affixed in conjunction with the planar lower face of the supporting flange 165 affixed to the lower part of the box-type beam 26, and affixed by adjustment of screws 168 and sleeves 167 to be contiguous with said supporting flange part. The sleeves 167, each of which has an end flange, are accommodated in holes 181 in the flange part 165. The holes 181 are elongated in the direction in which the slide 130 is moved. The screws 168 have a threaded portion 169, by which said screws affix the sliding body 166 to the sliding surface of the flange part 165.
Fig. 15 presents the section taken along the lines XV-XV of Fig. 12, and shows a specific slide disposition 130' of the rear pivot 128 of the upper lip plate 26 and a slide disposi-tion 135' for the horizontal flange 132' of the front plate 133'.
The supporting ~lange 174 of the slide arrangement 135', corres-ponding to the part 165 of Fig. 14, is affixed by screws 171, and sleeves 170 fitted with end flanges encircling them, to be conti-guous with the flange 132'. The sleeves 170 are accommodated in holes 183, which are elongated in the direction of displacement of the slide 135'.
A plurality of housing bodies 173, located side by side, are mounted on the slide supporting flange 174 in the axial direc-tion of the rear pivot of the upper lip plate 27. The housing bodies 173 are affixed, in the manner shown in Fig. 17, by screws 176 to the supporting flange 174. The supporting flange 174 is integrally connected with the box-type beam 26. The rear pivot 128 ~:ll7~ 7(~9 of the upper lip wall 27 is encircled, as shown in Fig. 17, by two housing bodies 173 and 179. The housing bodies 173 and 179 are affixed to each other by screws and are interposed between the lower plate 131 and the supporting flange 174, to which they have been affixed via screws 176. The screws 176 are accommodat-ed in elongated holes 178, permitting movements of the slide.
With regard to the control of the deflections of the upper lip structure, it is noted that the minimal deflection in the machine direction has in itself no significance, since the linearity in the breadth direction of the upper lip wall 27 is constant, regardless.
The apparatus of the invention provides a type of "float-ing"upper lip, with mutually independent vertical and horizontal position controls.

li71709 It is also to be understood that t~e following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of thc invention which, as a matter of language, might be S said to fall therebetween.

Claims (18)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:

1. Support and control apparatus for the upper lip wall of the slice of the headbox of a paper machine, said support and control apparatus positioning said upper lip wall in direc-tions substantially in its plane and also in directions substan-tially perpendicularly to its plane, said upper lip wall forming with a lower lip wall a conical lip part and defining a slit and being affixed at its rear to the headbox via a transverse pivot, said support and control apparatus comprising a box-type contile-ver beam extending down to the upper lip wall, said cantilever beam having a front wall; first control means at the front wall of said cantilever beam and coupled to said upper lip wall for po-sitioning said upper lip wall in directions in a vertical plane;
and second control means in operative relation with the pivot of said upper lip wall for positioning said upper lip wall in direc-tions substantially in the plane of said upper lip wall and sub-stantially perpendicularly to the directions in which said upper lip wall is positioned by said first control means.

2. Support and control apparatus as claimed in claim 1, further comprising first support means for coupling said first control means to said upper lip wall, said first support means including a plurality of turnbuckles in substantially para-llel, adjacent positions for controlling the opening dimension of the slit, each of said turnbuckles having a top end coupled via a pivot pin to a corresponding part of said first control means displaceable in vertical directions and a bottom end coupled via a pivot pin to said upper lip wall.

3. Support and control apparatus as claimed in claim 1, wherein said upper lip wall has a front area relative to the direction of flow of pulp suspension in said headbox, and further comprising fine position adjusting means for fine adjustment of the position of said upper lip wall, said fine position adjusting means comprising a supporting structure at the front area of said upper lip wall, said supporting structure including a plurality of screws in operative relation with the front area of said upper lip wall.

4. Support and control apparatus as claimed in claim 1, wherein each of said first and second control means comprises an elongated slide member having a longitudinal axis and a plurality of consecutive apertures formed therethrough and inclined relati-ve to its longitudinal axis, a plurality of guide members, and a plurality of sliding bodies each slidably mounted in a correspond-ing one of said guide members and having projecting part extending into a corresponding one of said apertures whereby said upper lip wall is moved in directions substantially perpendicular to the direction of movement of said slide member.

5. Support and control apparatus as claimed in claim 1, wherein said upper lip wall has an upper surface, and further comprising a supporting beam adjustably positioned between said upper lip wall and said cantilever beam for adjustment in directions of the plane of said upper lip wall, said supporting beam having slide parts for adjusting its position in said directions, fine position adjusting means for fine adjustment of the position of said upper lip wall, said fine position adjus-ting means having control components, a front plate supporting the control components of said fine position adjusting means, said front plate having a lower part and being adjustably mounted on said supporting beam for adjustment in directions of its plane, a pivot at the upper surface of said upper lip wall and contiguous with the lower part of said front plate, and a slide arrangement coupled to the pivot at the rear part of said upper lip wall in a manner whereby said upper lip wall is movable in directions substantially in the plane of said upper lip wall and in directions substantially perpendicular-ly to the plane of said upper lip wall.

6. Support and control apparatus as claimed in claim 2, wherein said upper lip wall has a front edge relative to the direction of flow of pulp suspension in said headbox, and said first support means is coupled to the front edge of said upper lip wall.

7. Support and control apparatus as claimed in claim 2, wherein said upper lip wall has a center area, and said first support means is coupled to the center area of said upper lip wall.

8. Support and control apparatus as claimed in claim 4, wherein said slide member of said first control means is movably mounted on the front wall of said cantilever beam for movement in longitudinal directions.

9. Support and control apparatus as claimed in claim 4, wherein said cantilever beam has a lower wall, further comprising an extension of the lower wall of said cantilever beam having a groove formed therein, and wherein said slide member of said second control means is movably mounted in said groove for movement in longitudinal directions for moving said upper lip wall in directions substantially in the plane of said upper lip wall.

10. Support and control apparatus as claimed in claim 5, further comprising front plate displacing means for displacing said front plate in directions of its plane, said front plate displacing means comprising an elongated slide member having a longitudinal axis and direction control means cooperating with said slide member and said front plate in a manner whereby movement of said slide member in longitudinal directions results in displacement of said front plate in directions of its plane with reference to said supporting beam.

11. Support and control apparatus as claimed in claim 5, wherein said cantilever beam has sliding surfaces and said supporting beam has an upper area and a central area, a flange part extending from the upper area of said supporting beam substantially perpendicularly to the plane of said supporting beam, another flange part extending from the central area of said supporting beam substantially perpendicularly to the plane of said supporting beam, and sliding arrangements in operative relation with said flange parts, said sliding arrangements being adjustable to adjust said supporting beam to rest against corresponding sliding surfaces of said cantilever beam.

12. Support and control apparatus as claimed in claim 5, wherein said cantilever beam has sliding surfaces and said supporting beam has a lower area, a flange-like part projecting from the lower area of said supporting beam, said flange-like part having spaced opposite sides, and sliding arrangements in operative relation with the sides of said flange-like part, said sliding arrangements being adjustable to adjust said supporting beam to rest against corresponding sliding surfaces of said can-tilever beam.

13. Support and control apparatus as claimed in claim 5, wherein said upper lip wall has a front edge relative to the direction of flow of pulp suspension in said headbox, and said pivot at said upper surface of said upper lip wall is positioned at the front edge of said upper lip wall thereby supporting said upper lip wall at said slit.

14. Support and control apparatus as claimed in claim 5, wherein said front plate has a front side relative to the di-rection of flow of pulp suspension in said headbox, and said up-per lip wall has a central area, said pivot at said upper surface of said upper lip wall is transverse and is positioned in the cen-tral area of said upper lip wall and cooperates with the lower part of said front plate, and further comprising supporting structures supporting the control components of said fine position adjusting means.

15. Support and control apparatus as claimed in claim 5, wherein said cantilever beam has a lower part and a projecting part extending from the lower part of said cantilever beam and in operative relation with the slide arrangement coupled to the pivot at the rear part of said upper lip wall.

16. Support and control apparatus as claimed in claim 5, wherein said supporting beam has a rear area and a flange part extending from said supporting beam substantially perpendicu-larly to the plane of said supporting beam and extending backward relative to the direction of flow of pulp suspension in said headbox whereby upon displacement of said supporting beam via the rear area thereof said flange part displaces said front plate principally in directions of the plane of said upper lip wall.

17. Support and control apparatus as claimed in claim 10, wherein said slide member of said front plate displacing means has a plurality of apertures formed therethrough inclined at an angle with the longitudinal axis of said slide member, and said front plate has projecting parts, each of said projecting parts extending into a corresponding one of said apertures.

18. Support and control apparatus as claimed in claim 15, wherein said slide arrangement coupled to the pivot at the rear part of said upper lip wall has an underside, and further comprising a substantially L-shaped beam extending from outside said slide arrangement contiguous with said cantilever beam, said slide arrangement resting at the underside thereof on said L-shaped beam.