MXPA97000700A - Orientador de fibras cor - Google Patents

Abstract

The present invention relates to a guidance system for orienting wood fibers comprising at least three platforms, including a top platform, a bottom platform and at least an intermediate platform between the top and bottom platform, to form a series of at least three platforms stacked substantially vertically, one directly above the others, passages that extend substantially vertically through each of the platforms, each of the passages on each platform having a width defined by a pair of spaced walls, the platforms are in adjacent vertical pairs, each of the pairs composed of a top platform that can be one of the upper platform and intermediate platforms and a lower platform, which can be one of the bottom platform or platforms intermediate, the passages through the bottom platform have a preselected width and, measured in a The first direction between and substantially perpendicular to the walls of the bottom platform, the width and is small enough to ensure orientation of the fibers passing therethrough to the desired average angular deviation from a second direction substantially perpendicular to the first direction. direction, the passages in an upper platform of each pair of vertically adjacent platforms in the series, have widths measured in the first direction correlated with widths of passages through their adjacent lower platform of the pair of platforms in such a way that a passage is divided through the upper platform of each pair of adjacent platforms in two passages by directly below passages formed through their adjacency to the lower platform of the pair of vertically adjacent platforms, the combined widths of the two passages directly below, are equal to the width of the passage through the super platform ior, so that the fibers that fall down through a passage in the upper platform, can fall directly on only one upper edge of a common wall between its two passages directly below on the lower platform, the upper platform forms a top platform of one of the vertically adjacent pairs of platforms and the bottom platform forms a lower platform of another of the pairs of vertically adjacent platforms and each intermediate platform forms an upper platform with its vertically adjacent lower platform and a lower platform with its platform upper immediately adjacent and wherein the walls of the passages in each upper platform in each pair of vertically adjacent platforms, are substantially aligned vertically and axially with the outer walls of a pair of adjacent passages directly below in their lower platform.

Description

ORIENTADOR DE FIBRAS COREAS Campo < le X? The present invention relates to a fiber orienteer, more particularly the present invention relates to a fiber orient from multiple platforms, to orient fibers, without significant segregation of the fibers per length. BACKGROUND OF THE INVENTION The concept of orienting fibers by passing them through narrow vertical passages (in comparison with the axial length of the fibers to be oriented) is practiced in the particleboard industry of very thin fibreboard and boards and has been some time Such a device is illustrated in U.S. Pat. No. 3,115,431 issued on December 24, 1973 to Stokes et al. This device includes the plurality of interengaged rotating discs, mounted on a plurality of substantially parallel side-by-side arrows, placed in a plane.

The disks on the arrows are placed uniformly intermediate to the disks on their adjacent arrows. In the described assembly, the disks in adjacent arrows rotate in the same direction, except for the last disks in the sequence, which rotate in the opposite direction. This type of arrangement (hereinafter referred to as the Stokes arrangement) has been found particularly satisfactory for use with long fibers. The description of the Stokes et al. Patent is incorporated herein by reference. Another similar device is illustrated in U.S. Pat. of Burkner No. 4,666,029 issued May 19, 1987, but where the disks in adjacent arrows are arranged in pairs in side-by-side relation, with the disks forming one of the pairs that define one side of an orientation passage of the discs that form the next spatial pair ^ axially that define the other side of the passage. This arrangement (hereinafter referred to as the Burkner arrangement) is also satisfactory. The Stokes arrangement is less complicated and seems to be almost as effective in aligning the fibers as the Burkner arrangement. The Burkner patents and co-workers are incorporated herein by reference. Both of these devices use their rotating discs to transport the long-length fibers that do not pass directly between the axially spaced discs on the upper part of the discs to an end where the axial spacing between the discs is wider, so that that the long fibers are placed preferably towards one end of the orienter and the short fibers at the other. A modified version of the arrangement as described in U.S. Pat. No. 5,325,954 to Crittenden et al., Issued July 5, 1994, employing at least one pair of platforms, that is, pre-orientator and counselor. If this significantly improved the operation of the system and better ensures that fibers in particular long fibers with more than about 15.24 cm (6") pass through the vertical passages in the bottom orienting platform more easily by first tilting the fibers by discs in the pre-orientator and direct them more effectively within the relatively narrow passages in the orientator.This system provides significant improvement over the Burkner and Stokes arrangements and is particularly suitable for handling long fibers. US No. 5,325,954, generally employing a relatively long bottom platform with a wider axial disc spacing towards one end of the orienter, but not segregating the fibers by length in the proportion that occurs with the arrangements of Burkner and Stokes. the height of the bottom edge of the bottom guiding platform on the mat or accumulated form In the collection band, it has a significant influence on the retained orientation of the very thin sheets or fibers in the band. The larger this space is, the greater the loss and orientation of the fibers that can be achieved in the counselor, in this way it is preferable to maintain this relatively small distance in the order of between 2.54 and 7.62 cm (1 and 3") preferably smaller to minimize this loss of orientation.It will appear apparent, if there is segregation of the fibers by length, that the fibers are placed in the collection band over a longer stretch of the band.This in itself is not a problem however if the description of fibers on the length of the orienter is not uniform, the height of the mat on Xa band is it will accumulate at a non-uniform velocity so that the height of the mat on the strip forms a protrusion towards one end of the orienter This means that the inclined bottom platform of the orienter must be adjusted to accommodate the protrusion, such that the spacing between the bottom platform and the upper part of the fibers in the band can be adjusted to the desired distance in the upper part of the projection but anywhere outside the band. In this way, the average angle of orientation of the fibers in this part of the orienter is significantly increased, ie the orientation is lost. The U.S. Patent No. 3,807,931 issued on April 30, 1974 to Woods et al., Describes another form of orienter that uses a number of vertically stacked platforms, each formed by vertical stationary fins, each provided with a vibrating cap that improves the movement of the particles. of wood between them. Each platform has a number of fins that is a multiple of the number of fins on the platform immediately above it, such that the fins on the upper platform are directly superimposed on corresponding fins on the inner platform and the fiber flux is divided by the upper platform and the divisions thus formed additionally sub-divide the next inner platform. In this device, the spacing between the fins on the upper platform is approximately half the average length of the fibers to be oriented and the spacing between the upper and lower platform is defined as the distance greater than the average length of the fibers. the fibers. The orientation system of this patent will clearly not be effective for very thin long sheets, nor will it work well for fibers of conventional length (7.62 to 10.16 cm (3 to 4").) Canadian Patent 920,529 granted on February 6, 1973 to Turner and collaborators, topavla shows another form of orientator where walls of separation are designed to move avoiding obturation Brief Description of the Present Invention An object of the present invention is to provide a guidance system with multiple platforms, which controls the fibers through its step to minimize segregation of the fibers by length and reduce the chances of trapping the fibers in the orientator and causing blockage.Widely, the present invention relates to a guidance system for directing wood fibers comprising an upper platform, a platform background and at least one intermediate platform between the top and bottom platforms, for forming a series of platforms stacked substantially vertically, one above the other, passages that extend substantially vertically through each of the platforms, each of the passages is defined by a pair of spaced walls, the walls at least in the upper platform are defined by axially spaced discs, which extend radially from a plurality of parallel arrows, the passages through the bottom platform have a pre-selected width and in a first direction between the walls of the platform in the background measure a size small enough to ensure orientation of the fibers passing to the desired average angular deviation from the second direction substantially perpendicular to the first direction, the passages on a top platform of a pair of vertically adjacent platforms in the series, have widths that are correlated with widths of passages through the adjacent lower platform of at least a pair of platforms, such that a passage through of the upper platform of the per of adjacent platforms in the series is bisected in two packs is by passages formed through the lower platform of the pair of platforms, in such a way that the material passing through through a passage in the upper platform it only fits on an upper edge of a common wall of the two passages on the lower platform and means for rotating the discs. Preferably, the axial spacing of the discs in the same arrow on the upper platform will be at least equal to the maximum cutting length of the fiber to be oriented. Preferably, the walls of the passages in an upper platform are substantially aligned vertically and axially, with walls of the passages in an immediately lower platform. Preferably, the vertical passages in each of the intermediate and upper platforms, placed on the bottom platform, have a width substantially equivalent to (2) n and for a Stokes disk assembly, where n is the number of platforms on the platform in the background Preferably, at least the upper edges of all the passages are formed by edges of disks mounted in axially spaced relation in arrows. Preferably, the walls of the passages on all platforms will be formed by axially spaced discs mounted on the arrows. Preferably, all the arrows on any of the platforms will be arranged on a plane.

Preferably, the disks in an arrow will be mounted in the middle between the disks in an adjacent arrow on each of the platforms. Preferably, the arrow on adjacent platforms will be disposed substantially in the same vertical plane. Brief Description of the Additional Drawings characteristics, objects and advantages will be apparent from the following detailed description of the preferred embodiments of the present invention, which are taken in conjunction with the accompanying drawings, wherein: Figure 1 shows a schematic assembly of a plurality of orientation systems constructed in accordance with the present and arranged in side-by-side relationship. Figure 2 is a section parallel to the direction of web movement, through a typical orientation system constructed in accordance with the present invention. Figure 3 is a schematic section on line 3-3 of Figure 2 illustrating the preferred mounting of the discs forming the side walls of the passage. Description of the Preferred Modes Figure 1 shows an orientator incorporating three orientation systems constructed in accordance with the present invention as indicated in 1, 2 and 3, arranged in side-by-side relationship to place a mat or accumulation indicated at 12 in a conveyor or the like 14. The mat 12 forms a configuration for manufacturing consolidated composite wood products from the material orientators (wood fibers) 1, 2 and 3. It will be apparent that while the orienting system 3 constructed in accordance with the present invention is illustrated in Figure 1, shows how the system can be positioned to take full advantage of a specific type of a distribution system that feeds an orientation system constructed in accordance with the present invention, i.e. in any one or more than systems 1, 2 or 3, can be used independently or in combination with other guidance systems of the pre present invention. The wood fibers normally employed with the orienting system of the present invention may have a reasonable length - generally less than about 30.48 cm (12") a thickness of less than about .685 cm (.24"), typically less than about .127 cm (.05"), a width in general of approximately 1.25 cm (1/2") and is approximately 7.68 cm (6") with a length-to-width ratio of at least 2. In an illustrated assembly, fibers 16 are fed from a conveyor or the like 18 using a tine pickup roller or the like 20 to disperse the fibers and feed them onto a pair of spaced distribution rollers 22 and 24, which are also in the form of rollers with tines mounted in a partially spaced parallel relationship, such that in the illustrated assembly, about 1/3 of the fibers pass between the distributor rolls 20 and 24 and form a feed for the orienting system 2, say the middle orienting system, while the distribution roller 22 distributes another third of the flow in the orienting system 3 and the roller 24 distributes the final third on the orientation system 1. Preferably, although the flow of each one is not necessary of guiding systems 1, 2 and 3 will be essentially the same. The income streams for guidance systems 1, 2 and 3 as indicated in 26, 28 and 30, fall between separations or walls of address 32, 34, 35, 36, 37 and 38, which delineate at least the width of income of the fibers 26, 28 and 30 and can, as described below, continue to form bordering walls between the orienting systems 1, 2 and 3. These steering walls 32, 34, 35, 36, 37 and 38, direct the fibers over the upper or lid platform of the respective orienting systems 1, 2 and 3, towards the periphery of the external disks to a length that is preferably just inside a vertical plane passing through the axis of those external disks (see separations 32, and 34 in Figure 2). With the orientation systems of the present invention, substantially all of the fibers in flows 26, 28 and 30 pass directly through their respective orienting systems 1, 2 and 3 and leave their respective guidance systems on a relatively short stretch as indicated in x in the direction of movement of the conveyor. This assembly in which the input fibers in the flows 26, 28 and 30, each passes through their respective orienting systems 1, 2 and 3, as a relatively narrow current measured in the longitudinal direction of mat or accumulated (x ), ensures that there is substantially no segregation of the fibers by length instead of the fibers being placed in a more homogeneous form. In general, the length x will be in the range of approximately .3048 to .9144 m (1 to 3 feet). In addition, concentrating the arrangement of the fibers over a relatively short stretch x, the spacing x between the bottom of the orienting system and the upper part 4 of the mat being formed, can be kept relatively constant as indicated by the dimension z in the Figures 1 and 2. In the illustrated assembly, the side by side, 1, 2 and 3 orienting systems have been aligned horizontally. However, considering that the orienting system 1 is the reference, the orienting systems 2 can move vertically as indicated by the arrow 42 with respect to the system 1 and similarly the orienting system 3, can be moved vertically as indicated by the arrow 44 with respect to the orienting system 2, to place the bottom of each of the orienting systems with respect to the upper part of the formed mat as required, that is if the spacing between the disc platforms is significant, it may be more convenient to arrange the platforms in a stepped relationship, with platform 3, ie upstream in the direction of movement in the band that is placed closer to the band than the other two. It will be apparent that although 3 guiding systems 1, 2 and 3 have been illustrated in combination, the present invention can be employed with a single orienting system or with two or more guiding systems. The use of three orienting systems is relatively convenient when a pair of distributor rolls 22 and 24 are employed since the main flow can be divided relatively easily into three separate flows from a single source. As illustrated schematically in Figure 2, each of the guidance systems (only one will be described) are formed by at least three platforms, a bottom platform B, at least one intermediate platform I (i) and an upper platform T ( see also Figure 1). In the illustrated assembly, only one intermediate platform has been illustrated. However, as indicated by (i), a number of intermediate platforms may be provided as required to meet the requirements for a number of bisections of passage based on the width and required in the background platform, to obtain the required orientation and the length L of the oriented fibers as will be described below. It is important that the disks 44 are directed and convenient means are provided schematically represented by the arrows 52 for directing the disks 44 - normally by displacing the arrows 46. In the illustrated assembly, the disks at one end (separating end) of the system The orientation of each platform has been illustrated displaced in the opposite direction to the other discs, however this is not essential or even preferred. The axes of the arrows 46 on the different platforms are preferably arranged as a grid pattern. The axes of the arrows on a given platform are preferably all placed on one plane (see planes 54, 56 and 58 designated by dotted lines and dashes in Figure 2) and the axes of the arrows on the series of stacked platforms are place in stacked relation in planes 60, 62, 64, 66, and 68, which are preferably substantially parallel. The planes 54, 56 and 58 are preferably parallel and extend in a direction which is preferably substantial perpendicular to the direction in which the planes 60, 62, 64, 66 and 68 extend. Although the planes 54, 56 and 58 have been polished that they extend substantially horizontal if they can be adjusted parallel to the upper part 40 of the mat that is formed.

In any case, in the arrangement illustrated in Figure 2, each of the platforms B, I (i) and T is formed by a plurality of disks 44, mounted in axially spaced relation in the arrows 46. In the illustration of the Figure 2, the arrows with the upper platform T have been indicated by at. also, the position of the arrow with respect to one end (front) has been indicated numerically, that is to say in the system of arrows 5 illustrated, as x for the arrow closest to the front 48 and 5 to the farthest arrow of the front 48. Similar numeration has been used in each of the platforms. Each intermediate platform is designated as I (2), (i) indicates the position or number of platforms that the intermediate platform is on the bottom platform B and the arrows are indicated in a similar way, ie 46 (III) is the front (first) arrow on the intermediate platform, immediately on the bottom platform B. The discs and arrows on the bottom platform B indicated by the similar reference numbers but with sub-index B, indicate the bottom platform, for example 46IB. In the illustration, all disks 44t, 44G and 44B have essentially the same diameter D. The spacing between adjacent disks mounted on arrows aligned substantially vertically, ie arrows 46 (? T), 46 (I1i) and 46 (IB) ), etc, is indicated by the dimension t. This dimension t, will usually be less than 5.08 cm (2") and is likely to be closer to 2.54 cm (1") and may be a negative number when the discs overlap. The overlap of the discs on a platform with discs on the adjacent upper or lower platform can be important, where the height or the orienting system is important since the overlap significantly reduces the height of the system. The degree of overlap obviously should not be sufficient and the disks should not be placed on adjacent platforms to ensure that there is no interference between the disks on adjacent platforms and a platform does not interfere with the operation of their adjacent platforms. The dimension D correlates with the diameter d of the arrow 46 and the space s between the arrows 46 on the same platform, to ensure that the spacing between the arrows 46 on each platform is at least equal to the length of the fiber to be processed , ie 1/2 (Sd) will normally be equal to at least the maximum length L of a processed fiber (see fiber 52 at the top of Figure 2) and D / 2 - r will be slightly smaller than Sd to provide spacing. The applicant has found that dimension D of 40. 64 cm (16") using arrows of diameter equal to approximately 5.08 cm (2") and spaced 22.86 cm (9") which operate very satisfactorily with very thin sheets or fibers having a maximum length of less than about 16.5 cm (6). 1/2") and an average of approximately 13.97 cm (5 1/2").

In the illustrated arrangement, the disk has been illustrated arranged as described above as a Stoke array. However, they can also be arranged as a Burkner arrangement. The Stokes array is however preferred, since the number of required platforms can be reduced with respect to the Burkner array. It is important that on any pair of adjacent platforms in the sequence, for example platforms P (I ?, and 1 (I) that the fibers that fall through the passages PB on the platform lc B to the PB passages can only contact a edge, ie only the upper part of one of the walls of the passages PB on the platform, such that each passage P (II) on an upper platform of the pair of adjacent platforms is bisected into two passages PB through the lower platform of the pair Preferably, the passages in the upper platform will bisect in two equal width passages in the lower platform and the total width of the two passages in the lower platform will be equal to the width of the passage in the upper platform of the pair (ignoring the measurements of Wall or disk thickness axially the arrows). As illustrated in Figure 3, the axial spacing between the adjacent discs 44 measured between the center of the discs (axial of the arrows - ignoring the wall thickness of separation torque or disc measured axially of the arrows) in each platform, is configured as illustrated. The axial spacing of the disc 44 on the platform B is adjusted to the dimension Yb which is the dimension required to obtain the desired degree of orientation (average angular deviation) of the fibers forming the mat 12, then each of the platforms placed by above, preferably it will be dimensioned in relation to it to ensure that the vertical passages defined between the discs in each platform, ie the passages Pt, PI (i) and PB and will increase in width according to the following formula: (Pi ) - < n > v * - »where YB is equal to the width of the passages in the back platform, that is to say with the passages PB and n equal to the position of the platform on the bottom platform counted from the bottom, that is to say the bottom platform it is not counted (ie the bottom platform B is equal to n = 0), the first intermediate platform is the first platform (n = l) etc. In the illustrated assembly, the platform I (i) will be the first platform up and the dimension Y (Ii) will be twice the dimension YB and the dimension Yt of the upper platform since there are only three platforms will be equal to 22) YB or four times YB. It will be apparent that with the Stokes disk arrangement, the number of platforms required is reduced with respect to the Burkner array, since the width Yt is defined by disks in adjacent arrows that bisect the space between the platforms on the same arrow, ie in Stokes arrangements, the width of the passage is defined by the spacing between discs in adjacent arrows. With Burkner the width of passage is defined by the spacing between discs in the same arrow, since the spacing between discs in the same arrow in the upper platform, also depends on the length of fiber L, that is to say at least as widely spaced as the length of the wafer, the platform number required is less with Stokes than with Burkner. As indicated, there is a minimum adjacent disc dimension in the same arrow on the upper platform, equal to or greater than the maximum cutting fiber length L, as indicated by dimension A in Figure 2. When an array is used Stokes, the disk in the adjacent arrow as indicated by the dotted line in Figure 2 is at a spaced distance A / 2 on the upper platform T; that is to say A / 4 in the intermediate platform I, and A / 8 in the platform of bottom and with three platforms as it is illustrated A / 2 If the Burkner array is used, the required platform number is higher since the displacement cash of disks in adjacent arrows can not be obtained, however the size of the passages in each platform must be half the width of the passages through the platform immediately above and the maximum width, ie the width Yt must accommodate the fiber length L, which requires that the current passage width between adjacent disks in the same arrow be equal to the dimension A as opposed to 1 / 2A when the Stokes arrangement is used. The stokes arrangement allows fewer platforms because the fibers look in any position only that portion of the disk that is projected onto the disks in the adjacent arrows and in this way the disk spacing in an arrow can be twice the width of the passage required . It will be apparent that both the maximum wafer length and the degree of orientation will determine the number of intermediate platforms required, it being important that the axial spacing in the bottom platform be narrow enough to obtain the required orientation and on the upper platform be wider than the maximum cutting length of the very thin sheets that are processed. For example if a spacing of 2.54 cm (1") between the disk 44B ie YB = 1.27 cm (1/2") and the maximum wafer length is, say 30.48 cm (12"), then the first intermediate platform will have a dimension of Y "of 2 <; t) Yß = 2.54 cm (1"), the second intermediate disk platform will have the passages with dimensions Y? a of 2 <2) YB = 5.08 cm (2"), the third platform will have passages with widths Y13 of 2 < a, Yß = * 10.16 cm (4"), and the next one will have the dimension of Y14 of 2 (4> YB = 20.32 cm (8"), and the upper width Yt of 2 (5, YB = 40.64 cm ( 16") It will be noted that each of the passages Pt, PIX, and PB in the illustrated arrangement are directly vertical in line with the passages immediately above and in effect bisect the passage immediately above, ie when the position of The walls of a passage are defined on a higher platform, the underlying platforms will have walls of passages (discs) in the same vertical plane.The use of discs, at least on the upper row platform T, is considered essential. the intermediate discs it may be convenient to use blades instead of discs and surely in the bottom platform blades can be used to replace the discs or in combination with discs, to further improve the orientation particularly to eliminate the space g (illustrated in Figure 2) and maintain a more accurate spacing between the bottom of the blades indicated by dotted lines at 60 in Figure 2. In an experimental configuration, disks with a diameter of 4.64 cm (16") mounted on arrows with diameters of 5.08 cm ( 2") as described above, were employed on three different platforms numbered one two and three respectively, which have axial disc spacings of 15.24, 7.62 and 3.81 cm (6", 3", and 1.5") respectively, the number and Platform arrangement is varied and spacing t = 2.54 cm (1") are employed. In each test, 900 grams of fibers with length of 15.24 cm (5") were fed to the orientation systems that have different numbers and platform arrangements.The results of the tests are illustrated in Table 1.

Table 1 Upper platform (platform number) None None None Intermediate platform (platform number) None Bottom platform (platform number) Overflow of its orienter end (grams) Null 250 Null 550 Footprint-Mat length placed cm 45.72 > 121.92 1 12211..9922 > 121.92 / in / 18/48 // 4488/48 It is apparent that a significantly more effective system is provided in terms of avoiding segregation by length and ensuring high performance per meter of orientator (measured in the plane of arrows and perpendicular to the arrows) when Three platforms are employed in a system constructed in accordance with the present invention. When the present invention is not employed, the footprint of the system is significantly increased 45.72 cm (18") to at least 121.92 cm (48"). It is best when the orientator is operated to direct the main flow of fibers on the upper parts of disks, to a position directly above the arrows, ie on the upper parts of the disks spaced far from the middle between the arrows, and that the greatest tendency or opportunity to plug is at the midpoint between the arrows where the peripheries of the disks on adjacent arrows intersect. Having described the invention, modifications will be apparent to those skilled in the art without departing from the scope of the invention as defined by the appended claims.

Claims (5)

1. - guidance system for wood fibers, comprising at least three platforms, including an upper platform, a bottom platform and when an intermediate platform between the upper platform and the bottom, to form a series of the three platforms at least substantially stacked vertically, one directly above the other, passages that extend substantially vertically through each of the platforms, each of the passages on each platform have a width defined by a pair of spaced walls, the platforms are vertical adjacent pairs, each of the pairs composed of an upper platform that can be one of the upper platform and intermediate platforms and a lower platform, which can be one of the bottom platform or the intermediate platforms, the passages through the bottom platform has a pre-selected width Y, measured in a first direction between and substantially perpe ndicular to the walls of the bottom platform, the width Y is small enough to ensure orientation of the fibers passing to the desired average angular deviation with respect to a second direction substantially perpendicular to the first direction, the passages on an upper platform of each vertically adjacent pair of platform in the series, have widths measured in the first direction correlated with widths of passages through their adjacency to the lower platform of the platform pair such that it passes through the upper platform of each pair of platforms adjacent is divided into two passages by passages directly below formed through their adjacency to the lower platform of the pair of vertically adjacent platforms, the combined widths of the two passages directly below, are equal to the width of the passage through the upper platform , so that the fibers that fall down through a pa Saje on the upper platform, can fall directly on only one upper edge of a common wall between its two passages directly below on the lower platform, the upper platform forms an upper platform of one of the pairs of vertically adjacent platforms and the platform of bottom forms a lower platform of another pair of vertically adjacent platforms and each intermediate platform forms an upper platform with its vertically adjacent lower platform and a lower platform with its upper platform immediately adjacent and where the walls of the passages on each upper platform in each pair of vertically adjacent platforms, they are substantially vertically and axially aligned with each of the outer walls of a pair of adjacent passages directly below in their immediately underlying lower platform.

2. - A guiding system as described in claim 1, wherein the walls at least on the upper platform are defined by axially spaced discs, which extend radially from a plurality of parallel arrows, means for rotating the discs, the axial spacing between discs in the same arrow on the upper platform, is at least as wide as the maximum length of the fibers to be fed.

3. A guiding system as described in claims 1 or 2, wherein the walls of the passages on all platforms are formed by axially spaced discs extending radially from parallel arrows.

4. A guidance system as described in claim 3, wherein the vertical passages in each of the intermediate and upper platforms placed on the bottom platform, have a width substantially equivalent to (2) n and a disc array Stokes where n is the number of platforms on the background platform.

5. A guiding system as described in claims 2, 3, or 4, wherein the disks in an arrow are mounted in the middle between the disks in an adjacent arrow in each of the platforms.