JPS6367576B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a lattice-knitted structure formed by lattice-knitting using knitting yarn made of bundles of fibers such as synthetic fibers. This type of lattice knitting structure has a plurality of knitting yarn paths set to extend in parallel along the diagonal of a square and intersect with each other, and multiple knitting yarns on each path are connected to the yarns on other paths. It is a string-like material with a square cross-section that is obtained by braiding it in a lattice shape while sequentially moving each knitting yarn so that it overlaps and intersects with each other.It is widely used as a base material for packing such as ground packing. It is used. By the way, in the case of conventional lattice knitted structures,
Usually, the number of knitting yarn paths is 2 to 4 and the number of knitting yarns is less than 40, and this is due to the following reasons. That is, firstly, when the number of knitting yarn paths is relatively small from 2 to 4, the necessary number of knitting yarns to be able to perform lattice knitting without creating unbraided parts, that is, parts where knitting yarns are not alternately polymerized, is 40. This is due to the fact that it has been found with a certain degree of accuracy based on experience within the scope of the book. Secondly, when the number of knitting yarn paths is 5 or more, it is known from experience that there will be parts that are not braided no matter how much effort is made with less than 40 knitting threads, and if there are parts that are not braided, the cross-sectional shape will change. This is because the fabric becomes distorted and does not form a square shape, and the presence of these areas tends to cause the surface to cave in or the knitting yarn to unravel, making it difficult to use it suitably as a packing material or the like. Third, there is no regular relationship between the number of knitting yarn paths and the number of knitting yarns, and even if the number of knitting yarns is 40 or more, if the number of knitting yarn paths is 5 or more, there will always be parts that are not braided. Because it was thought to be possible. However, in the case of such a small lattice knit structure in which the number of knitting yarn paths is 4 or less and the number of knitting yarns used is also less than 40, if you want to obtain a large cross-sectional area, it is natural that the number of knitting yarns is Since a material with a large diameter must be used, the surface is not smooth and has many irregularities, and there are many voids throughout, making it impossible to obtain a dense braided structure. Therefore, such a lattice knitted structure is difficult to suitably be used as a packing base material, etc., even if there is no part that is not knitted. Furthermore, when used as a packing base material, since there are many voids, there is also the problem that a larger amount of packing material such as oil or solid lubricant is required than necessary. On the other hand, if one tries to obtain a smooth and dense surface by using knitting yarn with a small diameter, it will naturally not be possible to create a lattice knitted structure with a large cross-sectional area, and its use will be limited to large widths. That will happen. The present invention has been made in view of these circumstances, and it is possible to make the surface as smooth as possible and to reduce the voids in the braided structure, not only when the cross-sectional area is small, but also when the cross-sectional area is large. To provide a lattice knitted structure which can be made dense with less strands and has no unbraided parts. The lattice knitting structure of the present invention that solves this problem has a number of knitting yarn paths N of 5 or more, a total number of knitting yarns n corresponding to n=2N ² +2N-4, and a number of knitting yarns in each path. The number of knitting yarns arranged is lattice knitted such that the number of knitting yarns passing through diagonal paths is two fewer than the number of knitting yarns passing through paths other than diagonal lines. The configuration will be specifically explained below based on the embodiments shown in FIGS. 1 to 3. In other words, the lattice knitting structure shown in Fig. 1 is constructed by sequentially moving 56 knitting yarns S with a small diameter in the direction of the arrows on five knitting yarn paths A to E modeled in Fig. 2. It is a string-like thing with a square cross-section, which is obtained by moving it and braiding it in a lattice shape so that it alternately overlaps and intersects. In addition,
The knitting yarn S is made by bundling fibers such as synthetic fibers, and the fibers are selected depending on the intended use of the lattice knitted structure. In manufacturing this lattice knitting structure, 56 knitting yarn bobbins sequentially move on a plurality of predetermined paths set to form knitting yarn paths A to E shown in FIG. 2 via a plurality of ratchet wheels, etc. This is done using a lattice braiding machine that is configured to be moved. Although this braiding machine differs from conventionally known lattice knitting braiding machines in the number of knitting yarn bobbins used and the number and shape of ratchet wheels for moving these bobbins, other configurations are approximately the same. Since the details are omitted, in this braiding machine, each knitting yarn bobbin is connected to each other on each knitting yarn path A and E located diagonally as shown in Fig. 2. The arrangement is such that 10 knitting yarns S are moved, and 12 knitting yarns S are moved on each of the other knitting yarn paths B, C, and D. In the case of a lattice knitted structure with such a configuration,
The number of knitting yarn paths N is 5, and the total number n of knitting yarns S used is 56, which is much larger than the number of knitting yarns (less than 40) in the conventional method. Coupled with the use of the thin knitting yarn S, the braided structure is dense with few voids and has a smooth surface while ensuring a predetermined cross-sectional area. Moreover, between the number of knitting yarn paths N and the total number of knitting yarns n = 2N ² + 2N-4
The number of knitting yarns arranged on each route A to E is such that the number of knitting yarns passing through diagonal routes A and E is two fewer than the number of knitting threads passing through non-diagonal routes B, C, and D. As shown in Fig. 4, there are no unbraided parts a, b, and c, and there is no risk of the knitting yarns S collapsing or coming into contact with the knitting yarns. It has a square cross-sectional shape with no distortion. Therefore, it can be used very suitably as a packing base material, and when used as a packing base material, the required amount of packing material can be minimized. By the way, the number of knitting yarns S corresponding to 2N ² +2N-4 is used, and the number of knitting yarns S arranged in each path A to E is such that the number of knitting yarns passing through diagonal paths A and E is other than the diagonal. It is clearly understood from the following that if the number of knitting yarns is two fewer than the number of knitting yarns passing through paths B, C, and D, braiding can be performed that eliminates the unbraided portion. It will be. That is, for the knitting yarn paths A to E shown in FIG. 2, each braiding form is taken as an example of a path corner portion where paths A and B turn and a path intersection portion where paths A, B, C, and D intersect with each other. Considering this, in the route corner part shown in Figure 3A, braiding is not done at the intersection position X ₁ of routes A and B, the intersection position X ₂ of routes A and C, and the intersection position x ₃ of routes B and C. In order to prevent this from occurring, when the knitting yarn Sa brought to the intersection position X ₁ moves on the path _A in the direction of _the intersection position is moved to the intersection X ₁ on _{the path B, and when the knitting yarn Sb' brought to the intersection position X 3 moves} on the path B in the direction of _the corner position The brought knitting yarn Sc is moved to the crossing position _X3 , and when this knitting yarn Sc moves in the direction of the crossing position _X3 , the knitting yarn Sa is moved to the crossing position _X2 . It is necessary that the above-mentioned knitting yarn Sb
When passes through the intersection position _X1 , the knitting yarn Sa' _, which is waiting at the _corner position In order to be able to move the knitting yarn Sb' to the intersection position _X1 when moving in the _X2 direction, it is necessary that this knitting yarn Sb' be held at the corner position _X4 at the same time. . The reason why _the knitting yarns Sb and _Sa ′ are kept waiting at corner _positions
If Sb and Sa' are moved directly to the crossing _position There is also. Therefore, in the path corner portion represented by the one shown in Fig. 3A, in order to prevent a situation in which the braid is not completed, even if the knitting yarn S is slightly misaligned at a certain moment during the braiding operation, it is necessary to It is necessary to be located at the corner position of each path and at the intersection position adjacent thereto. In addition, at _the route intersection shown _{in FIG} .
In order to prevent the situation where the braid is not braided at the intersection point _Y4 of D, when the knitting yarn Sa'' brought to the intersection point _Y1 moves in the direction of the intersection point _Y2 on the path A, it is necessary to The knitting yarn Sb brought to the intersection point Y1 is moved on the path D to the intersection point _Y1 , and when this knitting yarn Sd moves in the direction of the intersection point _Y1 , it is brought to the intersection point _{Y3 .} The knitting yarn Sb'' _, which had been in _the
When moving in the direction, the knitting yarn Se brought to the intersecting position _Y2 is moved on the path E to the intersecting position _Y3 , and this knitting yarn Se is moved in the intersecting position _Y3 direction. Sometimes, the knitting yarn
It is necessary that Sa'' be moved to the crossing position _Y2 at the same time. Therefore, at the route crossing portion represented by the one shown in Fig. 3 (b), a situation where no braiding occurs will not occur. In order to do this, it is necessary that the knitting yarn S is located at each intersection of the paths at a certain moment during the braiding operation, even if there is some positional deviation. Total number of knitting yarns n required to braid without tightening
is the number of intersections n of knitting yarn paths A to E, and the number of corners n ₂
must match the sum of In other words, when the number N of knitting yarn paths is 5 as shown in Fig. 2, n ₁
=40 and n ₂ =16, so n=n ₁ +n ₂ =56. It is clear that this holds true both when the number of knitting yarn paths N is less than 5 and when it is 6 or more, so the required number of knitting yarns n
and the number of intersections n ₁ of knitting yarn paths and the number n ₂ of corners, no matter what the number N of knitting yarn paths is, n=
The relational expression n ₁ + n ₂ holds true. Based on this relational expression, for example, the number of knitting yarn paths N
When the total number n of knitting yarns is determined from 2 to 11, the results are shown in the table below.

[Table] Now, if you look at the values of n ₁ and n ₂ shown in the above table, you will understand that they are both an arithmetic series, so find the relationship between n ₁ and n ₂ and N. and n ₁
The following relational expressions are obtained: =2N ² -2N and n ₂ =4N-4. Therefore, these relational expressions and the aforementioned n=n ₁ + n ₂
From the relational expression, the total number of knitting yarns n and the number of knitting yarn paths N
When the relationship is determined, the relational expression n=2N ² +2N-4 is obtained. Therefore, regardless of the number N of knitting yarn paths,
It is necessary to use a number of knitting yarns equivalent to 2N ² +2N-4. On the other hand, if we consider the number of knitting yarns to be arranged in the paths A to E of the total number n of knitting yarns, the number of yarns to be arranged in each of the paths A to E must be 1/2 of the number that intersects with the other paths. In the case of diagonal routes A and E, as is clear from Figures 2 and 3 A, it is necessary to wait the knitting yarn at two corner positions, so two yarns corresponding to the number of corners are prepared. It is necessary to arrange the knitting threads. Furthermore, in the case of paths B, C, and D other than the diagonal lines, there are four corners, and since it is necessary to wait the knitting yarn at the corners, there are four knitting yarns, two more than the diagonal paths A and E. need to be placed. In other words, the number of knitting yarns arranged on routes A to E needs to be such that the number of knitting threads passing through diagonal routes A and E is two fewer than the number of knitting threads passing through non-diagonal routes B, C, and D. be. Therefore, by satisfying the total number n of knitting yarns and the number of yarns arranged in each path A to E as described above, it is possible to obtain a lattice knitted structure with no unbraided portions. The above-mentioned relational expression n = 2N ² + 2N-4 also holds true when the number N of knitting yarn paths is 2 to 4, and the total number n of knitting yarns in this case is the same as that used in the conventional method. However, in the past, the required number of knitting yarns was not determined based on theoretical support in relation to the number of knitting yarn paths as mentioned above, but based on empirical evidence. As stated at the beginning, it was only a discovery. As can be easily understood from the above explanation, the lattice knitting structure of the present invention has a number of knitting yarn paths N of 5 or more, which is much larger than the number of knitting yarns used conventionally (less than 40). Since it uses knitting yarn of 56 or more yarns, the yarn can be made with a small diameter, the surface is as smooth as possible, there are extremely few voids overall, and a dense braided structure is created. It can be used as the property of In addition, by increasing the number of knitting yarn paths and the number of knitting yarns, this increase is possible infinitely, regardless of the cross-sectional area.
The above braided structure can be maintained by using a knitting yarn with a small diameter. In other words, the diameter of the knitting yarn is not increased to increase the cross-sectional area, but the number of yarns is increased while keeping the diameter of the knitting yarn thin, so no matter how large the cross-sectional area is, the surface is smooth and dense. It can be configured to have a braided structure. Furthermore, the total number of knitting yarns N is not increased meaninglessly compared to the conventional number, but is n=2N ² +2N-4, which was found based on theoretical support in relation to the number of knitting yarn paths N. Since it is determined by satisfying the relationship that
It is possible to obtain a lattice knitted structure in which there is no part that is not braided, there is no risk that a part will cave in or the knitting yarn will come undone, and the cross-sectional shape is square without distortion. Therefore, the lattice knitted structure of the present invention can be suitably used not only as a packing base material for various gland packings, but also for other bearings, bushings, cushioning materials, etc., and its practical value is extremely high. It is what it is. Particularly in the case of packing base materials that require packing materials such as oil or solid lubricants, there is an advantage in that the required amount can be minimized.

[Brief explanation of drawings]

1 to 3 show an embodiment of the lattice knitting structure according to the present invention, FIG. 1 is a perspective view of the lattice knitting structure, FIG. 2 is a model diagram of the knitting yarn path,
FIGS. 3A and 3B are explanatory diagrams showing a part of FIG. 2 on an enlarged scale, respectively, and FIG. 4 is a model diagram of a knitting yarn path showing an example of a case where a portion is not braided. A, B, C, D, E...Knitting yarn route, S, Sa,
Sa′, Sa″, Sb, Sb′, Sb″, Sc, Sd, Se...Knitting yarn, X ₁ , X ₂ , X ₃ , Y ₁ , Y ₂ , Y ₃ , Y ₄ ...Knitting yarn path Intersection position, X ₄ , X ₅ ... Corner position of the knitting yarn path.

Claims (1)

[Claims] 1 A lattice knitting structure in which the number N of knitting yarn paths is 5 or more, where the total number n of knitting yarns is n=2N ² +2N−
4, and the number of knitting yarns arranged in each path is lattice knitted so that the number of knitting yarns passing through diagonal paths is 2 fewer than the number of knitting yarns passing through paths other than diagonal lines. A lattice knitted structure.