Patent Publication Number: US-8974639-B2

Title: Angle and height control mechanisms in fourdrinier forming processes and machines

Description:
The present application relates to U.S. Provisional Patent Application Ser. 61/849,804 filed on Feb. 4, 2013 and claims priority therefrom. 
     The present application was not subject to federal research and/or development funding. 
    
    
     TECHNICAL FIELD 
     Generally, the invention relates to improved methods and mechanisms for dewatering paper webs. More specifically, the inventions are improved processes and machines, which produce better paper quality at reduced production costs and increased energy efficiencies. The improved methods and machines include devices that are arranged in the forming or wet section of a Fourdrinier paper machine, hereinafter referred to as a “Fourdrinier.” The devices are adjusted via actuators, which may be manually operated by means of manual actuators or with motors controlled through a programmable microprocessor. The term motors should be construed to include electric, pneumatic, hydraulic, and the like. 
     For purposes of this application, the term “machine direction” with respect to the Fourdrinier extends from the front “wet” end to the rear “dry” end. “Cross-machine direction” extends from one side of the paper machine to the opposite side thereof. In the present invention, a pair of sloped grooves on opposite sides of a moving cam-block is oriented in the cross-machine direction and driven from side-to-side in the cross-machine direction to either adjust an angle or a height of a foil blade for improved dewatering purposes. For purposes of this application, the term “pultrusion” refers to a manufacture of composite materials having a constant cross-section. Likewise, the terms “leading edges” and “trailing edges” used with respect to the term cam-block refers to the left and right sides of the cam-block when viewed from either side of the Fourdrinier and are referenced with the sheet direction of the forming paper. 
     BACKGROUND OF THE INVENTION 
     The forming or wet section of a Fourdrinier consists mainly of the head box and the forming wire, or fabric. Its main purpose is to generate consistent slurry, or paper pulp, for the forming wire. A breast roll, several foils, suction boxes and a couch roll commonly make up the rest of the forming section. The press section and dryer section follow the forming section to further remove water from the paper sheet. The paper pulp is deposited atop the forming wire or a forming fabric. The pulp is then dewatered to create a paper sheet. 
     Adjustable foils have been utilized previously for dewatering operations in Fourdrinier machines. For instance, U.S. Pat. No. 5,169,500 to Mejdell, incorporated by reference thereto, discloses an angle adjustable foil for a paper making machine. In Mejdell, a rigid foil member is pivoted by a cam-actuated adjustment mechanism to change the angle of the foil blade. This tends to move the foil blade in the cross-machine direction which opens a gap between the wet paper stock and the foil blade. The opened gap causes a loss of vacuum on the paper sheet. An aim of the present invention is to overcome this inefficiency. 
     BRIEF SUMMARY OF THE INVENTION 
     The improved devices of the present mechanism includes an upper pultrusion assembly arranged atop a lower pultrusion assembly to create a recess which contains a plurality of parts arranged therein to yield an adjustment mechanism. The adjustment mechanism includes cam-blocks, an actuator and associated couplers, guide keys, a connecting rod and glide shoes. Each cam-block includes a pair of inclined planar grooves and rides atop a glide shoe such that the cam-blocks may be slid toward a driven end or in an opposite direction to adjust either the height of a respective foil or an angle of a respective foil, according to whether the sloped grooves are utilizing the same angle, or different angles. Each planar groove includes an open side to allow the fasteners of the guide key to pass there through. One of the inclined grooves is provided on a first face of the cam-block; the other inclined groove is arranged on an opposite face of the cam-block. Guide keys are affixed on an interior surface of the upper pultrusion and extend into the inclined grooves to communicate with the cam-blocks and raise/lower or adjust and angle of the upper pultrusion as the cam-blocks move in a respective direction. Thus, the invention may be realized as two separate embodiments; one for adjusting a foil height when the slopes of the inclined grooves present on the sides of the cam-blocks are equal and the other for adjusting a foil angle when the slopes of the inclined grooves on the front and trailing edges of the cam-blocks are unequal. That is, the rate of change of the front and trailing edges are equal when the cam-blocks are driven from one side to the other side of the Fourdrinier. For ease in understanding the invention, it should be recognized that the upper pultrusions  25 A,  25 B may be referred to as the upper pultrusion  25 . Differences and commonalities in operation and working components of each are discussed below. 
     An actuator forming part of the improved adjustment mechanism is arranged at one end of the lower pultrusion assembly and is linked to a connecting rod that pushes or pulls the cam-blocks in a respective cross-machine direction to effect the height or angle adjustment of a particular foil. In this manner, the inclined planar grooves of each cam-block assist in causing a change in height or angle of the upper pultrusion assembly. An end of the lower pultrusion assembly, opposite to the actuator, is provided with an indicator means for visually observing the angle or height of the foil. This indicator may include a modified rod with measuring rings which indicate a height or angle. Otherwise, the indicator may include marks on an end plate. It should be recognized that certain modifications may be undertaken to the instant invention. For instance, a manual adjustment mechanism may be provided at one end of the lower pultrusion assembly in lieu of the motorized actuator as respectively shown in  FIGS. 1A ,  1 C. 
     As it can be understood from the various drawings, the upper pultrusion assembly includes at least one ceramic surface, which is atop the upper support pultrusion assembly, referenced throughout as upper pultrusion. The upper support pultrusion typically comprises a fiberglass material or fiber reinforced material. A scraper and its associated holder are affixed onto opposite sides or faces of the upper support pultrusion assembly. Each scraper directs fluids and contaminants away from where the upper pultrusion assembles to the lower pultrusion. The upper support pultrusion assembly is formed in an elongated manner, having a complementary shape to accept the upper side of the cam-blocks such that when the cam-blocks are withdrawn to one side of the Fourdrinier, the ceramic foil is aligned at for instance either a zero height in elevation or a −1 degree angle depending on the particular height or angle adjustment application. It is should be noted that the reference points and ranges for the heights and angles may be adjusted according to user needs and that any set forth in this application should be considered for illustrative purposes and not in a limiting sense. When the cam-blocks are forced towards the side opposite the actuator, the inclined grooves of the cam-blocks communicate with guide keys fastened to the interior side of the upper support pultrusion assembly to raise the height of the ceramic foil or change the angle. If the slope of the inclined grooves of the leading and trailing edges are equal then a height adjustment mechanism may be realized. Otherwise, if the included grooves are unequal then an angle adjustment mechanism may be implemented. Raising and lowering the ceramic foil or adjusting the angle of the foil to the paper sheet manipulates the fiber alignment in the paper sheet forming process. 
     Two separate embodiments are realized by sloping the inclined grooves of the cam-blocks in either direction across the paper machine. That is, a height adjustable foil may be implemented by providing cam-blocks with a front and rear face having inclined grooves formed therein. The inclined grooves slope from one side to the other whilst maintaining the same degree of slope of the inclined groove on both faces. In an angle adjustment embodiment, the inclined grooves formed in the surfaces of the faces of the cam-blocks may incorporate different angled grooves and sloped as shown in the drawings. That is, an angle adjustable foil may be implemented by sloping the inclined grooves on opposite faces of the cam-blocks at different angles causing the rate of change from the front end of the foil to vary from that of the back end. This forces a larger amount of displacement on, for example, the leading edge of the foil to occur thereby allowing an operator to adjust the angle at which the edges of the foil contact the underside of the forming wire or paper sheet. By maintaining a height difference between the leading and trailing edges of the ceramic foil(s), an angle adjustable embodiment is realized. 
     It is an object of the invention to disclose an improved process and mechanism for controlling the angle of an adjustable angle foil to achieve a better paper quality by adjusting the angle to create a desirable result in the paper forming process. 
     It is another object of the invention to set forth improved processes and mechanisms for controlling the height of an adjustable height foil to achieve a better paper quality. 
     It is a further object of the invention to teach a Fourdrinier having adjustable on-the-run mechanisms for adjusting the height and angle of foils or blades to easily switch over operation of the Fourdrinier to produce paper of various qualities and types without shutting down and restarting the machine. This on-the-run adjustment saves substantial energy costs and realizes a more energy efficient paper producing method of the paper machine. 
     Additional objects and advantages of the invention will be set forth in part in the description, which follows, and in part will be obvious from the description, or may be learned from practicing the invention. The objects and advantages of the invention will be obtained by means of instrumentalities in combinations particularly pointed out in the appended claims. 
    
    
     
       BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
       Other objects and purposes of this invention will be apparent to a person acquainted with an apparatus of this general type upon reading the following specification and inspecting the accompanying drawings, in which: 
         FIG. 1A  illustrates a partial exploded view of a foil angle adjustment mechanism and taken from the drive end.  FIG. 1B  illustrates a partial exploded view of the foil angle adjustment mechanism taken from an end opposite the one shown in  FIG. 1A .  FIG. 1C  shows an automated embodiment having a pneumatic or electric motor that controls either the height or angle of a foil and taken from the drive end. 
         FIG. 2  is a perspective view of the constructed lower pultrusion assembly including a substantial portion of the angle or height adjustment mechanism and showing the working relationship between the guide keys and the cam-blocks. 
         FIG. 3A  shows an end view of the height adjustable embodiment taken from an end of a glide shoe and cam-block at zero mm whereby the ceramic edges of the upper pultrusion are contacting an underside of the paper forming sheet.  FIG. 3B  shows the same end view as  FIG. 3A  with the height adjusted to −4 mm below the paper sheet. 
         FIG. 4A  shows an end view of the angle adjustable embodiment taken from an end of a glide shoe and cam-block and with a trailing edge of the ceramic foil at +0.5 degree.  FIG. 4B  shows the same end as  FIG. 4A  with the angle adjusted to −3.5 degrees. 
         FIG. 5A  shows a bottom view of the upper pultrusion assembly in an angle adjustable embodiment.  FIG. 5B  is a side or edge view of the upper pultrusion assembly.  FIG. 5C  is an end view of the upper pultrusion assembly. 
         FIG. 6A  shows an overhead view of the lower pultrusion assembly.  FIG. 6B  shows a side view of the lower pultrusion assembly taken from an edge of the glide shoe and cam-block.  FIG. 6C  is an end view of the lower pultrusion assembly. 
         FIG. 7  is a section view of the foil adjustment mechanism in an angle adjustment embodiment. 
         FIG. 8A  is an elevated plan view of the leading edge of a cam-block in the height adjustment embodiment of the invention.  FIG. 8B  is an elevated plan view of the trailing edge of the cam-block shown in  FIG. 8A . 
         FIG. 9A  is an elevated plan view of the leading edge of a cam-block in the angle adjustment embodiment of the invention.  FIG. 9B  is an elevated plan view of the trailing edge of the cam-block shown in  FIG. 9A . 
     
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
     The embodiments of the invention and the various features and advantageous details thereof are more fully explained with reference to the non-limiting embodiments and examples that are described and/or illustrated in the accompanying drawings and set forth in the following description. It should be noted that the features illustrated in the drawings are not necessarily drawn to scale, and the features of one embodiment may be employed with the other embodiments as the skilled artisan recognizes, even if not explicitly stated herein. Descriptions of well-known components and techniques may be omitted to avoid obscuring the invention. The examples used herein are intended merely to facilitate an understanding of ways in which the invention may be practiced and to further enable those skilled in the art to practice the invention. Accordingly, the examples and embodiments set forth herein should not be construed as limiting the scope of the invention, which is defined by the appended claims. Moreover, it is noted that like reference numerals represent similar parts throughout the several views of the drawings. 
     For illustrative purposes only, the invention will be described in conjunction with a Fourdrinier papermaking machine although the invention and concept could also be applied to other paper forming machines. The invention is preferably implemented in the wet section of the Fourdrinier which includes a forming board section, a hydrofoil section, and a vacuum section. 
     As is shown in  FIGS. 1A and 18 , an angle adjustable device  100  includes an upper pultrusion assembly  30 , an angle or height adjustment mechanism  80 , and a lower pultrusion assembly  10 . The height adjustable device  100  is shown in  FIGS. 1A-1C ,  4 A- 4 B,  7 , and corresponds to the cam-block shown in  FIGS. 8A-8B . An angle adjustable device  101  is represented in  FIGS. 3A-38 , and corresponds to the cam-block shown in  FIGS. 9A-9B . The other drawings represent parts which are in common between the height adjustable device and the angle adjustable device. Recognizable differences are shown in the drawings and include the shape of the upper pultrusions  25 A,  258 , the ceramic foils  60 A,  60 B, and the slope of the guide tracks  75 A,  758 ,  76 A,  76 B. In both embodiments of the invention, the upper pultrusion  25 A,  25 B includes a leading edge and a trailing edge. A closed top is formed between the leading and trailing edges and includes an upper surface to which either a single ceramic foil is affixed, as in  FIGS. 1A-1C  or a pair of ceramics are affixed as shown in  3 A,  3 B. The upper and lower pultrusions may be formed using a known forming technique such as extrusion. 
     In the angle adjustment embodiment, a single ceramic foil  60 A is arranged atop the closed top of the upper pultrusion  25 A as shown in  FIGS. 1A-1C . A pair of ceramic foils  608  is arranged on opposite sides of the upper pultrusion  258  in the height adjustable embodiment as shown in  FIGS. 3A-3B . The differences in shape between the upper pultrusions  25 A,  25 B are clearly depicted in the drawings. For instance, the exterior surface of the top of pultrusion  25 A includes a flat stepped region for accommodating the recessed portion of the underside of ceramic foil  60 A. In the height adjustable embodiment of  FIGS. 3A-3B , the upper surface of the upper pultrusion  25 B is sloped from side-to-side with a lower region formed in the exterior top and includes steps on either side for accommodating a pair of ceramic foils  60 B. The ceramic foils may be fastened to the upper exterior of the upper pultrusion in a known manner. The interior workings of both upper pultrusions are the same for both the height and angle adjustable embodiments. That is, the guide keys are fastened to the interior recess of the upper pultrusions in both embodiments and adjust a respective ceramic foil&#39;s angle or height as a plurality of cam-blocks move across a plurality of glide shoes. Each guide key is maintained in an operable fashion within a respective sloped track. Sloped tracks are formed on the opposite faces of a cam-block and receive a respective guide key. A pair of guide keys are arranged substantially equidistance from an end of the upper pultrusion. Enough pairs of guide keys are arranged within the upper pultrusion to ensure accurate adjustments of either the angle or height along the entire length of the upper pultrusion. 
     The upper pultrusion assemblies  25 A,  25 B include respective ceramic surfaces  60 A,  608  arranged atop the exterior of upper pultrusion support assemblies  25 A,  258 , as shown in  FIGS. 1A-1C  and  FIGS. 3A ,  3 B, respectively. The upper pultrusion support assemblies  25 A.  25 B are formed of fiberglass reinforced composite and shaped in an inverted U-shape (when viewed from either end) to span across the entire width of the Fourdrinier. Upper pultrusion assembly  25 A includes sloped exterior edges arranged on the leading and trailing faces with a stepped region that accepts scrapers  18  and holder  1 . A scraper  18  is provided on either face of the upper pultrusion support assemblies  25 A,  25 B and is secured thereto via fasteners  16  and a scraper holder  1  for preventing debris, liquid, pulp, chemicals, and the like from entering into the device. Both upper pultrusion support assemblies include a stepped region on the interior of the leading and trailing faces to accommodate the glide shoes and allow the upper pultrusions to be adjusted. As can be recognized by  FIGS. 3A-38  and  4 A- 4 B, the upper exterior of the upper pultrusion includes a pair of angled edges for securing the ceramic foil atop the upper pultrusion. In the height adjustment embodiment of  FIGS. 3A-3B , the angles are substantially ninety degrees; whilst in the angle adjustment embodiment of  FIGS. 4A-4B , the angles are acute. 
     The lower pultrusion assembly  10  is an elongated member formed to include a T-shaped recess on its underside for accepting T-bar  110  shown in  FIGS. 3A ,  3 B,  4 A,  4 B. A U-shaped recess (when viewed from either end) is formed on an upper side of the lower pultrusion assembly  10 . Fasteners  19  pass through a respective through opening in the lower pultrusion to secure a glide shoe  12  to a portion of the upper surface of the lower pultrusion assembly  10  within the U-shaped recess (Shown in  FIG. 7 ). Fasteners  13  secure an end plate  5  to one end of the lower pultrusion, as is shown in  FIGS. 1B and 2 . End block  4  and pivot  2  are secured to a region of the upper surface of the lower pultrusion assembly  10  via fasteners  7 , as shown in  FIG. 18 .  FIG. 1A  depicts a manual actuator  26  and  FIG. 1C  illustrates an automatic actuator such as motor  27  is adapted to the upper side of the lower pultrusion assembly  10  and is arranged at an opposite end of the lower pultrusion assembly  10  to end plate  5  (shown in  FIG. 18B ). The angle or height adjustment mechanism  80  as shown in  FIG. 1B  includes the glide shoes  12 , the end block  4 , drive adapter  3  (shown in  FIG. 1B ), pivot  2 , cam-blocks  14 , connecting rod  9 , actuator  26  (shown in  FIG. 1A ) or motor  27  (shown in  FIG. 1C ), end plate  5  and the guide keys  15 , as well as any associated respective fasteners. 
     The manual gear box  26  may be provided in place of the motor  27  for manually adjusting the height or angle of the foil, as shown in  FIG. 1A  and  FIG. 1C  respectively. The manual gear box  26  includes a handle and locking mechanism. A coupler  6  transmits torque from either the motor  27  or manual gear box  26  through the drive adapter  3  and onto the connecting rod  9 . Drive adapter  3  supports an end of connecting rod  9  and driver adapter  3  within a recess as shown in  FIGS. 1A-1C . Linear movement of the connecting rod  9  is transmitted to move the cam-blocks  14  across the glide shoes  12  thereby adjusting either the height or angle of the foil by causing the guide keys  15 , which are affixed to an interior surface of the upper pultrusion to rise and fall. Drive adapter  3  is formed with a yoke that accepts an end of the manual gear box  26  (actuator) or motor  27 . The overall shape of the drive adapter is cylindrical to fit into a cylindrical recess formed in an end of drive adapter  3 . Drive adapter  3  is elongated and includes a flat top having sloped edges on either side thereof. An end of connecting rod  9  extends into the end of the drive adapter  3  opposite the recess. The glide shoes  12  provide a reduced friction surface over which the cam-blocks  14  move to easily adjust the height or angle of the foil. Set screws  17  pass through openings in the upper surface of the cam-blocks to lock cam block  14  onto the connecting rod  9 . Guide keys  15  are fastened to the interior vertical sides of the upper pultrusion via threaded fasteners  24  to moveably mate with the sloped surfaces of a respective cam-block  14  such that lateral movement of the connecting rod is transmitted to the cam-blocks which in turn adjusts the height or angle of the upper pultrusion. The guide keys  15  are operationally arranged within the sloped grooves on the sides of the cam-blocks  14  such that as the cam-blocks  14  slide across the glide shoes  12 , the upper pultrusion is raised, lowered or angle adjusted with respect to a forming fabric or wire and the paper sheet. The guide keys are arranged in pairs. Each pair includes one guide key on the interior surface of the leading edge and the other guide key on the trailing edge of the upper pultrusion. The pairs of guide keys are arranged at predetermined distances. The number of pairs of guide keys necessary for implementing either embodiment of the invention will vary according to the width of the particular Fourdrinier and the length of the pultrusions necessary to span that length. Each pair is preferably spaced at uniform distance from its preceding and/or succeeding pair and/or one of the ends of the device along the interior of the upper pultrusion. The guide keys are conical in shape with a flat side and include a pointed end. A through opening is provided in the flat side of each guide key for receiving a threaded end of a fastener  24  that couples the guide key to the upper pultrusion. 
     End seals  11  are arranged between the “upper pultrusion”  25  and “lower pultrusion”  10  at opposite ends thereof and fastened there between via fasteners  20  ( FIGS. 1A-1C ). The end seals  11  include a complementary shape to receive drive adapter  3  and pivot  2  or end block  4  as shown. A plurality of through openings are provided in each end seal for accommodating fasteners  20  which couple the respective end seal to the upper surface of the lower pultrusion. The end seals serve a similar function to that of the scrape in preventing debris, pulp, water and the like from entering the device at the ends. Fasteners  21  couple pivot  2  to end block  4  at an end of the lower pultrusion  10  opposite the drive end, as shown in  FIG. 2 . Pivot  2  is includes a fastener opening with an open bottom for receiving an end of a connecting rod to provide support therefor. End block  4  includes a flat bottom and vertical sides which form a yoke and having openings in both sides for receiving an end of the connecting rod and an end of the indicator rod  8  as is shown in  FIG. 1B . Pivot  2  rests inside the yoke and operably couples the connecting rod and indicator rod together. One end of the connecting rod extends into the pivot  2  and end block  4 , whilst an end of an indicator rod  8  extends from an opposite side of the pivot  2  and end block  4 . The position of indicator rod is controlled by the connecting rod  9  such that an operator can determine either the height or angle of the foil from an end of the assembly opposite the drive end. Fasteners  22  couple drive adapter  3  to an upper surface of the lower pultrusion  10 . Fastener  23  fixes couple  6  within drive adapter  3 . 
     Each cam-block  14  includes a pair of sloped grooves on either its face or side as clearly shown in  FIGS. 2 ,  8 A- 8 B,  9 A- 9 B. The underside of the lower pultrusion assembly includes a T-shaped recess into which a T-bar, mounted atop the Fourdrinier, is inserted. It should be noted that a certain C-shaped channel may be utilized in place of the T-bar for securing the lower pultrusion assembly to the top of the Fourdrinier. The T-bar and C-shaped channel is preferably formed from stainless steel and rests atop the frame of the Fourdrinier. Seals are arranged at opposite ends of the devices and prevent debris from clogging the adjustment mechanisms. The indicator rod may comprise a hollow end into which the end of the connecting rod may be seated to couple the two together. 
     The motor  27  may be controlled via motor control circuitry or a programmable microprocessor, not shown. As can be understood by the skilled artisan when viewing  FIGS. 1A-B ,  2 , the actuator is fixed to the lower pultrusion assembly to push or pull the sliding cam-blocks across the low friction glide shoes to engage the sloped grooves of the cam-blocks with the keys inside the recess on the underside of the upper pultrusion assembly. The term “low friction” means a reduced friction surface that allows the cam-block to easily slide from side-to-side within the enclosure created by the upper recess of the lower pultrusion and the recess of the upper pultrusion. A connecting rod  9  connects the various cam-blocks together. As can be understood by  FIGS. 1A-1C ,  2 , the cam-blocks are fastened via fasteners  17  at predetermined intervals along the length of the connecting rod. The angle or height of the ceramic surface is changed as the cam blocks with their sloped grooves move over the glide shoes and raise or lower the upper pultrusion assembly. As can be understood by the skilled artisan, a plurality of cam-blocks and glide shoes may be arranged across a particular lower pultrusion assembly to ensure uniform adjustment of the entire ceramic foil. The indicator rod  8  extends through the end plate  5  and visually indicates a position of the angle or height on an end opposite the actuator. 
       FIGS. 3A-38  show a height adjustable mechanism. The phantom lines in  FIGS. 3A-3B ,  4 A- 4 B depict the sloped portion of the groove not in use. In  FIG. 3A , the connecting rod is withdrawn and the ceramic foil assumes height of zero mm with respect to the underside surface of a forming fabric or the like. In  FIG. 3B , the actuator extends the connecting rod to drive the cam-blocks across the glide shoes causing the upper pultrusion assembly and foil to be lowered to a height of −4 mm. As can be recognized, the upper pultrusion assembly is attached to the guide keys which communicate with the sloped edges of the cam-blocks and the height or angle of the ceramic foil is varied when the cam-blocks are driven via the connecting rod in a first direction. The upper pultrusion assembly returns to its initial state when the connecting rod is driven in a direction opposite the first direction. Thus, the height of the foil blade with respect to a forming fabric is easily changed.  FIGS. 8A ,  8 B show the particular cam block  14  for use in the height adjustment embodiment. In this instance, the slope of grooves  75 A,  75 B are equal to cause the leading and trailing faces of the upper pultrusion  25 B to uniformly be raised or lowered as the cam-block  14  moves across the glide shoe  12 . The shape of the upper pultrusion  25 B includes a stepped region on either side that extends outward to provide an overhang over the upper edges of the scraper  18  and scraper holder  1 . This overhang advantageously drains materials away from the opening between the upper and lower pultrusions which is covered by the scraper  18 . A sloped edge is provide on each of the faces and terminates beneath the ceramics  60 B which are arranged in a shelf formed in the upper edge of the upper pultrusion  25 B. The top of the upper pultrusion is sloped between the two shelves as shown in  FIGS. 3A-3B . 
       FIGS. 4A-4B  show an angle adjustable mechanism. In  FIG. 4A , the connecting  9  rod is withdrawn and the angle adjustable foil blade assumes a +0.5 degree. When energized, the actuator pushes the cam-blocks  14  across the glide shoes  12  such that the sloped grooves change the angle to −3.5 degrees.  FIGS. 9A-9B , depict the slope angle of the grooves  76 A,  768  on opposite sides of the cam-blocks being unequal, thus the angle of the ceramic foil with respect to the forming fabric may be varied. As can be understood by the skilled artisan, in the preferred embodiment, the sloped grooves of the cam-blocks are externally arranged and extend from either side-to-side or end-to-end. Likewise, certain modifications of the cam-blocks may be realized by arranging the sloped surfaces on an interior recess of the cam-blocks and the connecting rod may be driven into these sloped grooves to cause the change in either height or angle, respectively. Upper pultrusion  25 A includes a stepped region on the inner lower surface for accommodating the upper surface of the glide shoe. A stepped region is also provided on opposite edges as in the alternative embodiment. A scraper and its associated holder is provided on the leading edge of the upper pultrusion  25 A. A sloped region with a thicker upper edge over extends above the scraper and holder. A sloped edge also extends below the ceramic foil  28 . The upper surface of the upper pultrusion includes a track comprising sloped sides and onto which the ceramic foil  28  attaches. 
       FIGS. 5A-5C  show the respective views of the upper pultrusion assembly  25  and with a more clear view of the guide keys  15  in relation to the foil  28 . These drawings when viewed in connection with  FIG. 2  show the unique operating relationship between the upper and lower pultrusions. As can be recognized, the cam-blocks  14  move laterally across the glide shoes  12 . The guide keys  15  operationally mate with the sloped grooves on opposite sides of the cam-blocks to effect either a height change or an angle change of the ceramic foil with respect to a forming fabric. 
       FIGS. 6A-6C  show the lower pultrusion  10  and the relationship of the connecting rod  9  to the cam-blocks  14  and other associated parts. A plurality of the cam-blocks  14 , guide keys  15  (not shown), glide shoes  12 , and the connecting rod  9  are arranged across the entire mechanism to ensure uniform adjustments across the entire upper face of the ceramic. 
       FIG. 7  is a cross section view of the mechanism and showing the various locations of the guide key  15  as the cam-blocks  14  are slid across the guide shoes  12 . As can be recognized, the guide keys  15  are raised or lowered via the sloped grooves on the sides of the cam-blocks  14 . 
     It should be understood that it is contemplated that various other drives, pistons or motors including electric and hydraulic ones and their associated supply lines may be employed to practice the invention. In the height adjustment device, the adjustable blades are raised or lowered to cause them to intersect with the underside of the forming fabric at a predetermined height to influence the alignment of the fibers within the paper web. The height of the adjustable blades may be changed to ensure that the paper fibers are aligned in a desired direction. As can be understood, changing the height settings will directly influence the fiber orientation in the paper sheet. Likewise, the angle of certain foils may be adjusted according to a desired characteristic in the paper grade. Moreover, the quantity of parts may vary according to the length of the foil. 
     It is to be understood that the invention is not limited to the exact construction illustrated and described above, but that various changes and modifications may be made without departing from the spirit and the scope of the invention as defined in the following claims. While the invention has been described with respect to preferred embodiments, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in limiting sense. From the above disclosure of the general principles of the present invention and the preceding detailed description, those skilled in the art will readily comprehend the various modifications to which the present invention is susceptible. Therefore, the scope of the invention should be limited only by the following claims and equivalents thereof.