FI107394B - Tool for joining together the eyes in spirals fixed to the ends of a tissue to form a continuous wire - Google Patents

Description

107394

FIELD OF THE INVENTION The present invention relates to means adapted to form a locking seam, a method of forming in particular, a self-locking seam which can be used to seal the two ends of the fabric length to form an endless fabric.

10 Endless fabrics made from woven fabric are used in a variety of applications. Their use is very common in the paper industry where such fabrics and blankets are used to form, press and dry continuous paper webs. In order to ensure the long life of fabrics in this technical field, the seam must be very firm. On the other hand, the seam 15 must not have significant surface deflections, as in that case there will be marks on the paper.

One type of seam, which has proven to be quite reliable when used in the paper industry, is formed by a locking wire, for example of the kind described in U.S. Patent 4,123,022. the seams are made up of loops, side by side at both ends of the fabric and * · «are bonded to each other. There are several different methods * · for attaching stitches to the fabric. Thus, for example, loops can be · · · sewn onto a strip, which in turn is attached to the fabric. In an alternative * ·. **: 25 method, the ends of the fabric are bent and the coil formed by the · · · connected loops is inserted between the yarns of the fabric. The third method consists of weaving the machine direction yarns back into the fabric after they have been formed into loops. In all of these • ·. ···. there is one notable disadvantage in the seam loops .. \ 30 that it is very time consuming to join the loops to form a seam.

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After the loops have been attached to the ends of the fabric according to one of the aforementioned methods, depending on the width and fineness of the fabric, it is required from half an hour to eight hours to connect the ends to provide an endless I t «web. Besides, at least two people are needed to bring the loops 107394 2 together and press the locking thread through the various loops, and several more people are needed to hold the rest of the fabric in place.

These drawbacks will be exacerbated if the place where the seam is formed is not appropriate and, for example, necessitates 5 working in an upside down position.

The object of the present invention is to eliminate the aforementioned drawbacks and to provide a seam which can be used to fasten the ends of the fabric very quickly.

Another object is to provide a seam by which one or two persons can join both ends of a wide web.

A further object is to provide a device for fast and efficient connection of the seam-forming loops. Other advantages and objects of the present invention will be apparent from the following description of a suitable embodiment of the invention.

According to the invention, the aforementioned purposes have been achieved by a locking seam formed by two coils which are secured to the respective end of the fabric, wherein at least one coil is pre-shaped so that it can be locked onto the other coil, and .. taken together, they cling to each other and lock into place with a compression fitting. So y: '.' the interlocking coils form a tubular channel extending across the width of the fabric and through which a locking thread seam [I] 'can be conducted. 25 and provide a strong attachment.

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Because the helix loops at one end of the fabric do indeed catch on to the corresponding loops on the opposite end and do not merely lean against them. For this reason, power is needed to overcome the elasticity of the loops and bring them together. This force is exerted by a device which first places the two ends of the fabric over each other in such a way that the ends are displaced along a plane which is substantially perpendicular to the ends of the fabric and · · · · Then force the coils together as the device slides along the fabric ends 107394 3 to form a locking seam. The invention will be described in more detail below, with reference to the accompanying drawings, in which:

Figure 1 is a side view showing the ends of the fabric and the seam coils.

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Figure 2 is a main view of the seam coils shown in Figure 1.

Figure 3 is a top view of the seam coils of Figure 1.

Figure 4 is a top plan view of a completed locking seam.

Figure 5 is a side view of the seam of Figure 4.

Fig. 6 is a side view of a tool used to make a seam.

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Figure 7 is a plan view of a portion of the tool shown in Figure 6.

Figure 8 is a bottom view of a press plate and Figure 9 is a seam made with the tool shown in Figure 6.

20 .. The connection of fabric end edges by means of zipper type devices is well-known, particularly in the clothing industry. Such zippers usually consist of two straps attached to their own fabric edges and are provided with a • row of plastic or metal teeth disposed along opposite sides of the straps, whereby the teeth are joined together when they are interconnected by means of a · · · slide by means of a press fit fitted to the teeth of the other tape. , <<<; • ·, ··· teeth and similar teeth aligned with one another. between. The teeth are clamped or otherwise permanently attached to the strips.

In a newer embodiment of devices of this quality, a single row of helical loops to be connected to each other:; instead of the individual teeth, which helical loops are sewn to 107394 4 flush with the ribs aligned with each other. According to the present invention, it has been found that these continuous helical loops, hereinafter referred to as helices, can also be used to form a locking seam on endless fabrics, although they are very stiff and woven with relatively thick, stiff plastic yarns, as is common with forming fabrics and drying fabrics.

A common drying fabric of the above quality is shown in Figure 1. It consists of two rows of weft yarns 10, 20, between which warp yarns 30, 40 are woven in the usual manner. After the last weft row, each warp yarn is bent backward in the form of loop 50. by hand weaving mechanism. This method is described in detail in US Patent Application 085 902, filed October 18, 1979. The yarns are preferably rigid plastic filament yarn-15 and provide the fabric with the desired rigidity.

The continuous helix 80 is attached to the fabric 70 formed by the loops 50, preferably by threading through the loops before the warp yarns are woven back into the fabric as described above. The coil 20 consists of a plurality of loops 80 and each loop is connected to adjacent loops. Each loop has a relatively open ellipse. '···. sin shape. The loops of the coil are in planes parallel to each other and extend substantially perpendicular to the plane of the fabric e · · away from the respective end of the fabric.

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The coil is preferably formed of nylon or polyester filament yarn. The distal end of each of the fabric · · · loops 80 is deformed to form a base 90 having a width Τ 'perpendicular to the plane of the ellipse and. which exceeds the monofilament normal thickness T. As can be seen from the figures • · ·. ·. 30 2 and 3, each loop of the row is separated from the adjacent loop by a distance D.

However, since the base 90 is thicker than the remainder of the loop, the distance between the · · _ "D 'strains will be less than the thickness T.

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The opposite end 100 of the fabric terminates in the same manner as the end 70 with a coil 110 which is exactly similar to the coil 60. The loops 112 of the coil 110 are parallel to the loops 80 of the coil 60.

The coils 60 and 110 are further attached to the ends 70 of the fabric. 100 with locking straps 85 and 115, alternately passed through the ends of the fabric and the loops of the helix.

The locking seam is made by joining both ends of the fabric 70 and 100 10, whereby the loops 80 and 100 are forced to adhere to each other. Hereby, the loop positions at one end of the fabric are forced to engage with the two corresponding loops on the opposite edge of the fabric, as shown in Figures 4 and 5, to form a press fit connection between them. For best results, the distance D between adjacent loops of the coil 15 will correspond to the thread thickness so that when the loops engage, each individual loop will have physical contact with the loops of the opposite coil. As shown in Figure 4, the base of each loop will be located just inside the adjacent loops. For the sake of clarity, the loops in Fig. 4 are slightly separated from each other so that D becomes larger than T. The drying fabric is joined by ·. this way and the locking seam formed has proved to have tensile strength • «·. *> ··. hair over 35.72 kp / cm.

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• I »It is important that the different loops of the two opposing coils overlap each other sufficiently in the positions shown in Figures 4 and 5 so that the loops 80 • · ·. ·: ·! the inner side and the inner side 130 of the loop 120, both when viewed from the side, are · · · essentially semi-cylindrical, complement each other and restrict mainly through the seam of the cylindrical channel transversely across the width of the fabric. Locking Cord- • ♦. ···. ka 140 is passed through a passage for securing the coils to each other and thereby joining • · ·,. 30 man to confirm. The locking wire may be a rigid metal wire or a plastic monofilament. It has been found that the tensile strength of the drying fabric increases markedly when *: '* is used as a locking yarn, from 35.72 to over 89.3 kp / cm.

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The force required to effect adhesion between the various loops is relatively small, so that the locking seam described above can be closed by hand, preferably starting on one side and carefully bringing both ends together. However, this procedure is quite tedious and for fabrics with a width greater than 0.90-1.2 m, more than one person is required to complete the job. For this reason, a tool is provided to close the locking seam in a comfortable manner.

The tool 190, shown in Figures 6-8, consists of a lower and an upper 10 press plate 210, respectively. 200 which, according to Fig. 6, are carried on two arms 220 like the scissor arms. 230 in one position, aligned with each other. Plate 200 is connected via vertical pin 240 to second arm 220 while plate 210 is connected to arm 230. The arms are pivotally connected to one another by means of a pivot pin 15,260. Both arms are formed by holes 270 handles which act as handles.

280, which allow you to grasp and operate the tool in the same way as ordinary scissors. When the handle ends are separated, so do the tiles and vice versa.

The upper tile 200 is shown in detail in Fig. 8. The tile bottom comprises a first, substantially planar, surface 290, a second, substantially. · · ·, A planar surface 300 which is substantially in the same plane as the first surface and a third, substantially planar surface 310.

When the tool is used to close the locking seam, it is moved in the direction indicated by the arrow · · · 400, so that the first and third surfaces are • · 9 adjacent to each other while the second surface is “downstream” . The first and third surfaces are joined by a substantially vertical wall • ·. · * ·. 330, which, as will be explained below, limits the plane in which the coils • · ·, 30 are connected to each other. As will be apparent from Figure 8, the third surface 310 * ;; * is displaced vertically with respect to the first and second surfaces 290 and 300 *: * and is further located above these surfaces. The height difference between them is approx; 1.25 cm. The engaging portion 340 connects the second surface 300 with the third surface 310 • · 107394 7. Holes 350, 360, and 370 are made on both plates for pressure rollers. The operation of the latter is explained below.

The lower plate 210 has an upper side which forms a complement to the lower side of the upper 5 plate so that both tiles can be brought together in a reciprocal support, as will be seen in Figure 6.

The above pressure rollers are shown in Fig. 7. One pressure roller 375 is inserted into the hole 370 such that its axis of rotation extends transversely to the direction of movement indicated by the arrow 190 of the tool 190. The rollers 355 and 365 are symmetrically inserted into holes 350 and 360 respectively. YY forms an angle A with respect to the direction of movement of the tool, which angle according to Fig. 7 is less than 900. The angle A may thus be, for example, 600. The lower plate is provided with similar rollers disposed beneath the upper rollers such that when the fabric is inserted between them.

The tool works as follows. When both tiles are closely overlapped, two channels are formed between them. The lower channel is substantially horizontal and is bounded by a first surface 290, a second surface 20 300, and corresponding surfaces of a lower plate. The duct start to the right extends parallel to the lower duct and is bounded by a third • · «, * ··· surface 310, a vertical wall 330, and corresponding surfaces of the lower tile.

. · J ·. Thereafter, the upper channel diverges in the direction towards the lower channel and • · · joins with it along its engaging portion 340. Thus, both channels form Y.

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When using the tool, the angles 70 and 100 of the corresponding end of the fabric are taken, respectively. 105 of tool 190 between the plates 200, 210, grips the handles • ·. ···. 9 to move the tool with the arrow 400 * t 30 in the direction shown in Figure 9. As shown in Fig. 6, the end 100 passes through the upper channel, while the end 70 passes through the lower channel. As the ends pass through the tool, they are forced in the direction toward a common vertical plane defined by wall 330.

It will be appreciated that the loops 80 and 110, immediately prior to engaging with each other, will be positioned adjacent to a substantially vertical plane parallel to the vertical wall 330. The actual engagement between the coils occurs when the loops of the coil 110 in the upper fabric 100 are inserted into the coils 80 of the coil 80 of the lower fabric 70 as the upper ends are fed over the engaging portion 340. Up to now, the roller 375 acts by providing a pressure effect on the loops. When both ends of the fabric have reached the second surface 300, the coils are joined, the ends of the fabric being in the same plane and connected as shown in Figures 4 and 5.

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The upper tile is fixed mainly on your horizontal! a guide member 390 for guiding the fabric end 100 between the slabs.

The overall width of the tool is between 7.5 and 12.5 cm and thus not too large for manual control. When the tool thighs are pressed together, the plates are forced against the fabric ends and rollers. The distance between the handle holes 270 and 280 and the pivot pin 260 extends beyond the pivot point to the tile, providing a mechanical advantage.

In the present invention, it has been found that using the above-described tool and locking seam forming means, it is possible to produce a fabric having a width of up to 6 m by joining the respective ends of the fabric in less than a minute. Because «. · ·. the coils are joined together by a press fit and are in fact self - locking, only two persons are needed to join the ends of the fabric, the other. j 25 to hold the ends of the fabric while the other forces the coils to grip • · ·. ·: ·! with each other. As soon as the coils are locked together, they are subjected to a slight • · · • _ stretching so that they remain straight. In this mode, the loop heads are locked together to form the channel shown in Figure 5, • ·. ···. so the locking thread 140 can be inserted between the loops. A single person can push the locking wire over the entire width of the fabric.

»> I t **: * 'The essential feature of the tool is that, as explained above, it overlaps: both ends of the fabric at the same time keeping the ends displaced relative to each other so that they do not extend in the same plane. This embodiment of the tool is important, especially when the fabric is a forming wire. Typically, such fabrics have a two-dimensional severity. In other words, they resist the forces acting on the same plane as the wire. If the force at the same level as the wire scale plane acts toward the edge of the fabric, the fabric will resist this force and turn against its plane in a perpendicular direction. Typically, the edges of two fabrics are joined together by a zipper seam such that the edges are placed side by side in substantially the same plane as both ends of the fabric. As the edges are joined, the seam and the remaining edges will form Y in the plane of the fabrics. However, the dryer fabrics cannot be joined with a zipper seam in this way for the reasons stated above. The tool described herein solves this problem by allowing the two fabrics to be joined together by means of a zipper seam such that the seam and the two edge portions form a Y (as shown in Figure 6) perpendicular to the plane of the fabrics.

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Many modifications of the invention can be made without departing from the spirit and scope of the invention as defined in the following claims.

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Claims (4)

1. Tools for joining the loops (80,112) into the ends (70,100) of a tissue attached to coils to form an endless wire, and which loops (80,112) are formed such that a press-fit joint is formed when the coils of the coils are joined together, characterized in that the tool consists of: two plates (200, 210) which together form a first channel connected to a second channel, which two channels are offset along a tab which is substantially perpendicular to the tissue; two handles (220, 230) each connected to their respective plate (200 and 210, respectively), wherein the handles (220, 230) are interconnected by means of a pivot member (260) so that one plate in relative the other may be displaced to exert a force between the plates, the loops being joined to press fit joints as the two coils (60, 110) pass through their respective channel as the tool is displaced along the the ends of the tissue (70, 100). A tool according to claim 1, characterized in that it is provided with means 20 (355, 365) which are arranged to force the ends in the direction of said pile as the tool is displaced along the ends of the tissue (70,100). • · · * · * 3. A tool according to claim 2, characterized in that said forcing means consists of two pressure rollers (355, 365) arranged in said plates (200, 210) and located on each side of the seam in a saddle. location, that their • ♦ ·. ·: «! rotary shaft forms an angle (A) with the seam less than 90 °. • · · Tool according to claim 3, characterized in that it is provided with a third «·. ···. pressure roller (375), which is arranged to exert pressure on the coils to provide these engagement with each other. * · · »· • ·« 9 · «M * • · · • ·« • '»·