JPH0379463B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to outer shell members of braided packing with a core and an outer core, and fiber-reinforced composite materials based on synthetic resins, metals, carbon cement, etc. The present invention relates to a bag-knitted structure suitably used as a reinforcing material and a method for manufacturing the same.

[Prior Art] As a conventional cored braided packing, for example, as shown in FIG. 7, one in which a rod-shaped central member 100 is covered with an outer shell member made of a tubular bag-knitted structure 101 is known. ing.

By the way, the tubular bag-knitted structure 101 is
It is generally braided by a bag-knit braiding machine shown in FIGS. 8A and 9A. The braiding machine shown in Fig. 8A is
Eight impellers A are arranged close to each other in a circular ring shape so that each adjacent impeller A is driven to rotate in opposite directions as shown by the arrows. Thread bobbin carriers b1...b15 (indicated by white circles in the figure) are formed in which thread bobbin carrier engaging grooves a are formed at equal intervals in the circumferential direction, and 16 thread bobbin carriers b1...b16 are arranged as a set of eight odd-numbered thread bobbin carriers b1...b16. ,
The thread bobbin carriers b2...b16 (indicated by black circles in the figure, hereinafter referred to as even-numbered carriers) are divided into two sets: the thread bobbin carriers b2...b16 (indicated by black circles in the figure, hereinafter referred to as even-numbered carriers), and the thread bobbin carriers b2...b16 (shown as black circles in the figure, hereinafter referred to as even-numbered carriers). Odd-numbered carriers b1...b15 are sequentially transferred from the engagement groove a of one impeller A to the engagement groove a of the other impeller A at a point adjacent to adjacent impellers A, A... While moving the even-numbered carriers b2...b16 in mutually opposite directions (for example, the odd-numbered carriers b1...b15 clockwise and the even-numbered carriers b2...b16 counterclockwise),
The tubular bag-knitted structure 101 shown in FIG. 8B is obtained by performing bag-knitting with knitting yarns fed out to predetermined composition points from yarn bobbins (not shown) held by each yarn bobbin carrier b1...b16. It is configured so that

In other words, the bag knitting structure 101 connects the plurality of knitting yarns 102A on the clockwise braiding route and the plurality of knitting yarns 102B on the counterclockwise braiding route at the intersecting point P1 on the two baglet braiding routes. ...At P8, the braid is braided into a bag shape while being sequentially moved so as to intertwine from both the inner and outer sides.

The number of impellers A in the braiding machine varies depending on the size of the bag knitting structure A, that is, the length of the circumference proportional to the diameter (outer diameter). In the braiding machine, 12 impellers A are arranged close to each other in a circular ring shape so that each adjacent impeller A is rotated in opposite directions as shown by the arrows, and the peripheral edge of each impeller A is Four thread bobbin carrier engaging grooves a are formed at equal intervals in the circumferential direction, and 24
Odd numbered thread bobbin carriers b1...b24
Thread bobbin carrier b1...b23 with 12 pieces in one set
(Indicated by a white circle in the figure, hereinafter referred to as odd number carrier)
and thread bobbin carriers b2...b24 (shown in black in the figure, hereinafter referred to as even-numbered carriers), each set of 12 even-numbered thread bobbin carriers b1...b24 are connected to each adjacent impeller A. , A..., by sequentially transferring from the engagement groove a of one impeller A to the engagement groove of the other impeller A, the odd-numbered carriers b1...b23 and the even-numbered carriers b2... b24 in opposite directions (for example, odd-numbered carriers b1...b23 clockwise, even-numbered carriers b2
...b24 clockwise) while transferring each yarn bobbin carrier b1...b2 along the bag knitting braiding path.
A tubular bag-knitted structure 101 shown in FIG. 9B is formed by bag-knitting using knitting yarn fed out to a predetermined composition point from a yarn bobbin (not shown) held at 4, and shown in FIG. 9B.
In other words, the tubular bag-knitted structure 10 shown in FIG. 8B
It is configured such that a bag knitted structure 101 larger than 1 is obtained.

[Problems to be Solved by the Invention] By the way, the rod-shaped core member 1 shown in FIG.
00 covered with an outer shell member made of a cylindrical bag-knitted structure 101, for example, when using it as a ground packing, the packing base material of FIG. 10 having a circular cross section is rolled or molded. By pressurizing it with a , it is formed into a rectangular (square) cross section as shown in FIG. 7 .

However, in the packing base material shown in Fig. 10,
Since the bag knitting structure 101 is braided in an arc shape, the knitting yarns 102A and 102B are not extremely bent over the entire circumference, so there is no problem. In the packing base material, at the four corners, knitting yarn 1
02A and 102B will be extremely bent. Therefore, depending on the type of knitting yarns 102A and 102B, it may be difficult to bend the corners due to their elasticity, or even if they are bent, the stress caused by the bending may be Due to this increase, there is a risk that the knitting yarns 102A, 102B may be cut at each corner.

As described above, if it is difficult to form the packing base material into a rectangular cross section depending on the type of knitting yarns 102A, 102B, the types that can be used as knitting yarns 102A, 102B are limited, and the range of use is narrowed. This will reduce the versatility of the threads 102A and 102B. Moreover, if a cut occurs at a corner, the braid of the bag-knitted structure 101 will come undone from there, reducing the sealing performance of the gland packing.

The present invention has been developed in view of the above circumstances, and eliminates the step of bag-knitting knitting yarn into a square shape with corners and press-forming it into a square cross-section using a roll or mold. The corners are easily formed by avoiding excessive bending of the yarn at the corners, which expands the range of use of the knitting yarn and improves its versatility. An object of the present invention is to provide a bag-knitted structure and a method for manufacturing the same, in which an increase in stress generated at the corners is suppressed, the cutting of knitting yarns at corners can be reliably prevented, and the braided state does not come undone.

[Means for Solving the Problems] In order to achieve the above object, the bag knit structure according to the present invention is a bag knit structure with a single interlaced layer, in which knitting yarns are entangled from the inside and outside to form a bag knit braid. The length of the knitting yarn passing through the outer braiding route and the length of the yarn passing through the inner braiding route between the interlacing points formed on the ridgeline is set, and the length of the knitting yarn passing through the outer braiding route set to the long dimension and the length of the yarn passing through the inner braiding route are set to the short dimension. The ridge corner where two ridge lines intersect is braided using knitting yarns that pass through a set inner braiding route.

In addition, in order to achieve the above object, the method for manufacturing a bag knit structure according to the present invention includes a method in which a plurality of yarn bobbin carriers divided into two sets are moved in mutually opposite directions for each set along a bag knitting braiding path. In a method for producing a bag knitted structure of a single interlaced layer, the knitting yarn is fed out while the knitting yarn is intertwined from the inside and outside at a plurality of intertwining points and then knitted. The ridgeline is braided by moving two sets of yarn bobbin carriers in opposite directions so that the length of the knitting yarn passing through the inner braiding path is equal, and the length of the knitting yarn passing through the outer braiding path is equal to the length of the knitting yarn passing through the inner braiding path. so that it is longer than the knitting thread passing through,
Each set of thread bobbin carriers is moved in opposite directions to braid the ridge corner where two ridge lines intersect.

[Function] According to the bag knitting structure according to the present invention, the ridge corner where two ridge lines intersect is divided into a knitting yarn passing through an outer braiding path set to a longer dimension and a knitting yarn passing through an inner and outer braiding route set to a shorter dimension. Since it is formed by bending and braiding with a relatively loose margin, it is possible to avoid the inconvenience of the knitting yarn being bent excessively at the ridge corner, that is, the corner mentioned above, and as a result, there is no excessive The generation of stress can be suppressed.

Further, according to the method for manufacturing a bag-knitted structure according to the present invention, the yarn bobbin carriers are moved in opposite directions for each set so that the knitting yarn passing through the outer braiding path is longer than the knitting yarn passing through the inner braiding path. By moving and braiding the ridge corner where two ridge lines intersect, the inconvenience of the knitting yarn being bent excessively at the ridge corner, that is, the corner, is avoided, and the bag knitting does not generate excessive stress on the knitting yarn at the ridge corner. Structures can be manufactured.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

FIG. 1A is a model diagram of a knitting yarn path showing an embodiment of a bag knit structure according to the present invention, and the bag knit structure 1 is constructed by, for example, a first set of six yarns moving along a clockwise braid path. Knitting yarn 2A and a second set of 10 knitting yarns 2B moving along the counterclockwise braiding path
It is knitted into a rectangular (square) tube shape by interlacing it from the inside and outside. Knitting yarn 2 of this bag knitting structure 1
As A and 2B, carbon fibers, glass fibers, ceramic fibers, metal fibers, or organic fibers (for example, aramid fibers, phenol fibers, PBI fibers, carbonized fibers, PTEF fibers, etc.) are used alone or in combination. Ru. Then, at the interlacing points P1...P8 of the knitting yarns 2A and 2B formed on the four ridge lines X1, X2, X3, and X4 of the bag-knitted braid, between the corner interlacing points, that is, P1 and P2, P3 and P4, The lengths of the knitting yarn 2A passing through the outer braiding route and the knitting yarn 2B passing through the inner braiding route between P5 and P6 and P7 and P8 are set to be equal,
Two ridgelines X1 and X2, X2 and X3, X3 and X4
Four ridge corners Y1, Y2, formed by intersecting
Braiding is performed using a knitting yarn 2B that passes through an outer braiding path in which Y3 and Y4 are set to be long, and a knitting yarn 2A that passes through an inner braiding path that is set to be short. In other words, between the intersecting points near each edge Y1...Y4 (between P8 and P1, between P2 and P3, between P4 and P5, between P6 and P
knitting yarn 2B passing through the outer braiding path in
is made long, and the knitting yarn 2A passing through the inner braiding path is made short.

Such a bag knitting structure 1 is braided by a bag knitting machine M shown in FIG. This braiding machine M
In this method, eight impellers A are arranged close to each other in a rectangular (square) ring shape so that each adjacent impeller A is driven to rotate in opposite directions to each other as shown by the arrows, and
Four thread bobbin carrier engaging grooves a are formed on the peripheral edge of each impeller A at equal intervals in the circumferential direction, and 16 thread bobbin carriers b1...b16 are selected from six thread bobbin carriers b1...b6 shown by white circles. With the first group,
10 thread bobbin carriers b7...b16 shown in black circles
The yarn bobbin carriers b1...b16 are divided into two second sets consisting of two sets, and each thread bobbin carrier b1...b16 is connected to the engagement groove a of one impeller A to the other impeller A at a point close to each adjacent impeller A. By sequentially transferring to the groove a, the first set of carriers b1...b6 are made to follow the clockwise braided path, and the second set of carriers b7...b16
The knitting yarns 2A and 2B are fed out to predetermined composition points from the yarn bobbins (not shown) held by the respective yarn bobbin carriers b1...b16 while moving the yarns along a counterclockwise braiding path. be done.

As a result, between each interlacing point formed on the four ridge lines X1...
and P8, the knitting yarn 2A passing through the outer knitting path has a length equivalent to the amount of rotation of the impeller A at a rotation angle of 180 degrees, and the knitting yarn 2B passing through the inside knitting path has a length similar to that of knitting yarn A. In this case, it is braided to have a length corresponding to the amount of rotation of the impeller A at a rotation angle of 180 degrees.

Also, two ridge lines X1 and X2, X2 and X3,
Four ridge corners Y formed by the intersection of 3 and X4
1, Y2, Y3, and Y4, the knitting yarn 2B passing through the outer braiding path has a length corresponding to the rotation amount of 270 degrees of rotation angle of the impeller A, and the knitting yarn 2A passing through the inner braiding path has a length corresponding to the rotation angle of 270 degrees of the impeller A. The braid will have a length corresponding to the amount of rotation of A at a rotation angle of 90 degrees. That is, in each ridge corner Y1, Y2, Y3, Y4, the knitting yarn 2B passing through the outer braiding route is different from the knitting yarn 2B passing through the inner braiding route.
A first set of thread bobbin carriers b1...b6 and a second set of thread bobbin carriers b7
…Move b16 in opposite directions to form the ridge corner Y1
...I am trying to braid Y4.

Therefore, each of the ridge corners Y1...Y4 can be formed without extremely bending both the knitting yarn 2A passing through the inner path and the knitting yarn 2B passing through the outside path. Regardless of the different degrees of elasticity, the ridge corners Y1...Y4 can be easily
can be formed, the range of use of the knitting yarns 2A and 2B is expanded, and versatility can be improved.

In addition, at each edge corner Y1...Y4, the knitting yarn 2
A and 2B have a length corresponding to the amount of rotation of impeller A by 90 degrees or 270 degrees, and are formed by bending and braiding with a relatively large margin. Excessive stress is not generated in the yarns 2A and 2B. Therefore, since there is no risk of the knitting yarns 2A, 2B being cut at each of the ridge corners Y1...Y4, the knitting yarns 2A, 2B occurring at each of the ridge corners Y1...Y4 are
The inconvenience that the braid of the bag-knitted structure 1 is unraveled by cutting B can be reliably prevented.

In addition, in the bag knitting braiding machine M shown in FIG.
A through hole a1 is formed in the center of the impeller A arranged at the four corners, and the core yarn (not shown) drawn out from this through hole a1 is connected to the knitting yarn 2 of each of the edge corners Y1...Y4.
It is inserted between A and 2B as an outer core member, and the braiding machine M
A core member (not shown) formed into a rod shape with a substantially square cross section that is guided out from the center hole m of the core member (not shown) is covered with an outer shell member made of the tubular bag-knitted structure 1, and is used, for example, as a ground piece. Ru. As the core member, a single material such as expanded graphite, natural graphite, mica, or vermiculite, or a mixture of two or more of these materials mixed with a suitable adhesive and molded into a rod shape with a substantially square cross section is used. be done.

In the bag knitted structure 1 braided by the method described above, the ridge lines X1...X4 and the ridge corners Y1...Y
4, the drawn-out lengths of the knitting yarns 2A and 2B, that is, the length between the interlacing points, are different, and the braiding timings are different, so the knitting pattern is as shown in FIG. 1B. The knitting yarn 2A, which braids the ridge corner part from the inclination angle θ1 of 2A and 2B,
The inclination angle θ2 of 2B is larger. however,
In the conventional bag-knitted structure 101 shown in FIG. 9B,
Since the drawn-out lengths of the knitting yarns 102A and 102B do not differ over the entire circumference, and the braiding timing is uniform and does not deviate, the knitting pattern is as shown in FIG. 9C. 102
Inclination angle θ1 of B (knitting yarn 2 for braiding the ridge line of the present invention)
A, 2B) is equal to the inclination angle θ2 of the knitting yarns 102A, 102B that braid the outer peripheral edge (corresponding to the knitting yarns 2A, 2B that braid the ridge corner of the present invention).

FIG. 3A is a model diagram of a knitting yarn path showing another embodiment of the bag knit structure according to the present invention, in which the bag knit structure 1 has a first set of 12 yarns moving along a clockwise braid path. The knitting yarns 2A and the second set of 12 knitting yarns 2B moving along the counterclockwise braiding path are intertwined from the inside and outside to form a square tube. Then, the four ridge lines X1,
Knitting yarns 2A, 2 formed on X2, X3, X4
At the intersecting points P1...P12 of B, between each intersecting point, that is, P1 and P2, P2 and P3, P4 and P5
and P6...Knitting yarn 2A or 2B passing through the outer braiding path between P10 and P11, P11 and P12
The lengths of the knitting yarns 2A or 2B passing through the inner braiding path are set equal, and the four ridge corners Y1, Y2, formed by the intersection of the two ridge lines X1 and X2, X2 and X3, and X3 and X4, Y3 and Y4 are braided with a knitting yarn 2A or 2B passing through an outer braiding path set to a long length and a knitting thread 2A or 2B passing through an inner braiding route set to a short length. In other words, there is a gap (P1
2 and P1, between P3 and P4, between P6 and P7, and between P9 and P10). is made short.

Such a bag knitting structure 1 is braided by a bag knitting machine M shown in FIG. This bag-knitting braiding machine M has 12 impellers A arranged close together in a rectangular (square) ring shape so that each impeller A is rotated in opposite directions as shown by the arrows. Four thread bobbin carrier engaging grooves a are formed on the peripheral edge at equal intervals in the circumferential direction, and 24 thread bobbin carriers b1...b24 are indicated by white circles as a first set consisting of 12 thread bobbin carriers b1...b12. ,
12 thread bobbin carriers b13...b2 indicated by black circles
The thread bobbin carriers b1...b24 are sequentially transferred from one impeller A to the other impeller A at a point close to each adjacent impeller A. Possibly, the first set of carriers b1...b12 are aligned along a clockwise braiding path;
While aligning the second set of carriers b13...b24 along the counterclockwise braiding path, each thread bobbin carrier b1
...knitting yarn 2 that is fed out to a predetermined composition point from a yarn bobbin (not shown) held by b24
It is braided by A and 2B.

As a result, between each interlacing point formed on the four ridge lines X1...
and P8, the knitting yarn 2A passing through the outer braiding path
has a length corresponding to the amount of rotation of impeller A at a rotation angle of 180 degrees, and the knitting yarn 2B passing through the inner braiding path has a length equivalent to the amount of rotation of impeller A at a rotation angle of 180 degrees, similar to knitting yarn A. It will have a corresponding length and be braided.

Also, two ridge lines X1 and X2, X2 and X3,
Four ridge corners Y formed by the intersection of 3 and X4
1, Y2, Y3, and Y4, the knitting yarn 2B passing through the outer braiding path has a length corresponding to the rotation amount of 270 degrees of rotation angle of the impeller A, and the knitting yarn 2A passing through the inner braiding path has a length corresponding to the rotation angle of 270 degrees of the impeller A. The braid will have a length corresponding to the amount of rotation of A at a rotation angle of 90 degrees. Therefore, the same effects as the bag knit structure 1 having the knitting yarn path shown in FIG. 1A, which is braided by the bag knit braiding machine M shown in FIG. 2, can be achieved. In this bag knitting braiding machine M as well, the core yarn is led out from the through hole a1 in the center of the impeller A arranged at the four corners, and the outer core member is inserted between the knitting yarns 2A and 2B at the ridge corners Y1...Y4. There is no change in the fact that the core member inserted as a core member and led out from the center hole m is covered by the outer shell member made of the tubular bag-knitted structure 1. For the same reason as mentioned above, the knitting pattern is made such that the inclination angle of the knitting yarns 2A and 2B that braids the ridge corner is smaller than the inclination angle θ1 of the knitting yarns 2A and 2B that braid the ridgeline, as shown in FIG. 3B. θ2 becomes larger.

In each of the above embodiments, a square tubular bag knitted structure 1 and a method for manufacturing the same have been described.
A plurality of impellers A are arranged close to each other in a rectangular ring shape as shown in FIG. four thread bobbin carrier engaging grooves a are formed at equal intervals in the circumferential direction on the peripheral edge of the thread bobbin carrier;
24 thread bobbin carriers b1...b24 are shown by white circles; a first set consisting of 12 thread bobbin carriers b1...b12; and 12 thread bobbin carriers b are shown by black circles.
13...Divide into two sets of the second set consisting of b24,
Each thread bobbin carrier b1...b24 is connected to each adjacent impeller A.
By using a bag-knitting braiding machine M that sequentially transfers the engagement groove a of one impeller A to the engagement groove a of the other impeller A at a point near the sixth impeller A,
A rectangular tubular bag-knitted structure 1 shown in the figure can be manufactured.

[Effects of the Invention] Since the present invention is configured as described above,
This produces the following effects.

According to the bag knitting structure of claim 1, the ridge corner where the two ridge lines intersect is arranged so that the knitting yarn passing through the outer braiding path set to a longer length and the knitting yarn passing through the inner braiding route set to a shorter length are relatively loose. Since it is formed by bending and braiding the knitting yarn, it is possible to avoid the inconvenience of the knitting yarn being bent excessively at the ridge corners, that is, at each of the four parts. Since the ridge can be easily formed regardless of the shape, the range of use of the knitting yarn can be expanded and its versatility can be improved. In addition, the knitting yarn is not bent excessively at the ridge corner, and is bent with a relatively large margin, which prevents excessive stress from being generated in the knitting yarn, thereby preventing the knitting yarn from breaking at the ridge corner. However, it is possible to reliably prevent the inconvenience of the braid of the bag-knitted structure being unraveled, and there is no need to pressure-form it into a rectangular cross section using rolls or a mold.

Further, according to the method for manufacturing a bag knit structure of claim 2, the yarn bobbin carriers are moved in opposite directions for each set so that the knitting yarn passing through the outer braiding path is longer than the knitting yarn passing through the inner braiding path. By moving and braiding the ridge corner where two ridge lines intersect, the inconvenience of the knitting yarn being extremely bent at the ridge corner, that is, the four corners, is avoided, and the elasticity differs depending on the type of knitting yarn. Since ridges can be easily formed regardless of the angle, the range of use of knitting yarn can be expanded and its versatility can be improved. By bending with enough allowance, excessive stress is suppressed from occurring in the knitting yarn, preventing the knitting yarn from being cut at the ridge corner, and ensuring that the entire braid is not unraveled due to this cut. In addition, it is possible to easily manufacture a bag-knitted structure by omitting the step of pressure-forming into a rectangular cross section using rolls or a mold.

[Brief explanation of drawings]

1 to 6 show embodiments of the present invention,
FIG. 1A is a model diagram of the knitting yarn path showing one embodiment of the bag knit structure, FIG. 1B is an explanatory diagram showing the stitch pattern of the bag knit structure of FIG. 1A, and FIG.
FIG. 3A is a model diagram of the knitting yarn path showing another embodiment of the bag knit structure, and FIG. 3B is the bag knitting shown in FIG. 3A. An explanatory diagram showing the stitch pattern of the structure, Fig. 4 is an arrangement diagram of the impeller group of the braiding machine for the bag knit structure shown in Fig. 3A, and Fig. 5 is an illustration of the impeller group of the braiding machine for the bag knit structure shown in Fig. 3A. FIG. 6 is a schematic perspective view of a bag knitted structure braided by the braiding machine of FIG. 5, and FIG. 7 is a sectional view showing an example of a conventional cored braided packing. Fig. 8A is an explanatory diagram showing an example of the arrangement of impeller groups of a conventional braiding machine, Fig. 8B is a model diagram of the knitting yarn path of a bag knit structure braided by the braiding machine of Fig. 8A, and Fig. 9A The figure is an explanatory diagram showing another example of the arrangement of the impeller group of a conventional braiding machine. FIG. 9C is an explanatory view showing the stitch pattern of the bag-knitted structure shown in FIG. 9B, and FIG. 10 is a cross-sectional view of the cored packing base material. 1... Bag knitting structure, 2A, 2B... Knitting yarn,
b1, b2... ...Thread bobbin carrier, P1, P
2... ...Intersecting point, X1...X4...Ridge line, Y1...
Y4...Rid corner.

Claims (1)

[Scope of Claims] 1 In a bag knit structure with a single interlaced layer, the knitting yarn passing through the outer braiding path and the inner side between the interlacing points formed on the ridge line of the bag knitting by interlacing the knitting yarns from the inside and outside. The lengths of the yarns passing through the braiding paths are set to be equal, and the ridge corner where the two ridge lines intersect is braided by the knitting yarn passing through the outer braiding path set to a longer length and the knitting yarn passing through the inner braiding route set to a shorter length. A bag-knitted structure characterized by: 2 A plurality of yarn bobbin carriers divided into two sets pay out the knitting yarns while moving in opposite directions for each group along the bag-knitting braiding path, and intertwine the knitting yarns from the inside and outside at multiple intertwining points to create a braid. In the method for manufacturing a single interlaced layer bag knit structure, two sets of yarn bobbin carriers are arranged so that the lengths of the knitting yarns passing through the outer braiding path and the knitting yarns passing through the inner braiding path between the interlacing points are equal. The yarn bobbin carriers are moved in opposite directions for each set to braid the ridge lines, and the yarn bobbin carriers are moved in opposite directions for each set so that the yarn passing through the outer braiding path is longer than the yarn passing through the inner braiding path. A method for manufacturing a bag-knitted structure, characterized in that the ridge corner portion where two ridge lines intersect is braided by moving the ridge.