JPH0340849A - Tubular plain stitch structure and production thereof - Google Patents

Abstract

PURPOSE:To avoid the trouble of extreme folding at an edge part and prevent the generation of excessive stress on a knit yarn by carrying out the knitting with a knitting yarn passing through an outer knitting path and a knitting yarn passing through an inner knitting path in a state bent with a surplus. CONSTITUTION:Edge parts Y1 to Y4 at which two edges X1 to X4 are crossed are knit by transferring each set of yarn bobbin carriers in opposite direction in such a manner as to lengthen the knitting yarn passing through an outer knitting path compared with the knitting yarn passing through an inner knitting path. The objective tubular plain stitch structure 1 free from excessive stress on the knitting yarn of the edge part can be produced by the above process while preventing the trouble of excessive folding of the knitting yarns 2A, 2B at the edge parts Y1 to Y4, i.e., at the angles.

Description

[Detailed description of the invention] [Industrial application field] Suekan 11JJ is used for outer shell members of braided packing with inner core and outer core, and fiber reinforced composite materials based on synthetic resin, metal, carbon cement, etc. The present invention relates to a bag-knitted structure suitably used as a reinforcing material, etc., and a method for producing the same.

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

By the way, the tubular bag-knitted structure 101 generally has the following characteristics:
It is braided by a bag-knitting braiding machine shown in FIGS. 8A and 9A. The braiding machine shown in FIG. 8A has eight separate wheels A arranged close to each other in a circular ring shape, and each adjacent separate wheel A is arranged as shown by an arrow.
In addition, four thread bobbin carrier engaging grooves a are formed at equal intervals in the circumferential direction on the peripheral edge of each separate wheel A, and 16 thread bobbin carriers b1 are driven to rotate in the advancing direction. ...B16 is a thread bobbin carrier bl...B15 (indicated by a white circle in the figure, hereinafter referred to as odd number carrier), which is made up of 8 odd numbered pieces, and 8 even numbered pieces are made up of 1 set. One set of thread bobbin carriers b2...b
16 (indicated by black circles in the figure, hereinafter referred to as even number carriers), and each yarn pobin carrier b1...
By sequentially transferring b16 from the engagement groove a of one separate car A to the engagement groove a of the other separate car A at the proximity point of each adjacent separate car A, A... , odd carrier bl...b15 and even carrier b2...
・b16 in opposite directions (for example, odd carrier b1・
...Turn clockwise around b15, number carrier b2...
...b16 counterclockwise) along the bag knitting braiding path, each yarn pobbin carrier bl...b
The yarn bobbin (not shown) held at the yarn bobbin No.
The structure is such that a tubular bag-knitted structure 101 shown in Figure B can be obtained.

In other words, the bag knitting structure 101 has #i several knitting yarns 102A on the clockwise braiding path and a plurality of knitting yarns 102A on the counterclockwise braiding path on the two bagging braiding paths.
2B are braided into a bag shape while being sequentially moved so as to be intertwined from both the inside and outside at the intertwining point PI...P8.

[The number of separate cars A in one machine varies depending on the size of the bag-knitted structure A, that is, the length of the circumference that is proportional to the diameter (outer diameter), and In this machine, 12 separate cars A are arranged close to each other in a circular ring shape so that each adjacent separate car A is driven to rotate in opposite directions to each other as shown by the arrows. Four thread bobbin carrier engaging grooves a are formed at equal intervals in the circumferential direction,
24 thread bobbin carriers bi... Thread bobbin carrier bl...b24 made up of 12 odd numbered thread bobbin carriers bl...
...b23 (indicated by a white circle in the figure, hereinafter referred to as an odd number carrier), and thread bobbin carrier b2...B24 (indicated by a black circle in the figure, hereinafter referred to as an odd number carrier) consisting of 12 even numbered carriers. Even number carriers) are divided into two sets, and each yarn pobin carrier bl...b24 is connected to each adjacent separate wheel A, A...
By sequentially transferring from the engagement groove a of one separate car A to the engagement groove of the other separate car A at the proximity point of..., the odd number carrier bi...b23 and the even number carrier b2...b24 along a bag-knit braiding route in opposite directions (for example, clockwise around odd-numbered carriers bl...b23, clockwise around even-numbered carriers b2...b24). While transporting each yarn pobbin carrier b
1... A cylindrical bag-knit structure 101 shown in FIG. 9B is formed by bag-knitting with knitting yarn fed out to a predetermined composition point from a yarn bobbin (not shown) held by b24,
In other words, the structure is such that a bag-knitted structure 101 larger than the tubular bag-knitted structure 101 shown in FIG. 8B can be obtained.

[Problems to be Solved by the Invention] Incidentally, when the rod-shaped core member 100 shown in FIG. The packing base material shown in FIG. 10, which has a circular cross section, is pressed with a roll or a mold to form the rectangular (square) cross section shown in FIG. 7.

However, in the packing material shown in FIG. 1O, since the bag knitting structure 101 is braided in an arc shape,
2A and 102B are not extremely bent over the entire circumference, so there is no problem. However, in the packing material formed into the rectangular cross section shown in FIG. 7, the knitting yarns 102A and 102B are extremely bent at the four corners. It will be 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 the corners are folded.

Due to the increase in stress caused by the bending, there is a risk that the knitting yarns 102A, 102B will 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 yarn 102A, 102B, the types that can be used as knitting yarn 102A, 102B are limited, and the range of use is narrowed. , 1
This will reduce the versatility of 02B. Furthermore, if a cut occurs at a corner, the braid of the bag-knitted structure lot will come undone from there, reducing the sealing performance of the gland packing.

The present invention was made in view of the above circumstances, and eliminates the step of braiding knitting yarn into a rectangular shape with corners and press-forming it into a rectangular cross section using a roll or a mold.
The formation of corners is facilitated by avoiding excessive folding of the knitting 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 in which an increase in stress generated in a knitting yarn is suppressed, the breakage of the knitting yarn at a corner can be reliably prevented, and the braided state is not unraveled, and a manufacturing method thereof.

[Means for Solving the Problems] In order to achieve the above-mentioned object, a bag-knitted structure according to the present invention is a bag-knitted structure with a single interlaced layer, which is made of a bag-knitted structure in which knitting yarns are entangled from the inside and outside to form a bag-knitted structure. The lengths of the knitting yarns passing through the outer braiding route and the knitting yarns passing through the inner braiding route between the interlacing points formed on the ridge lines are set to be equal, and the lengths of the knitting yarns passing through the outer braiding route are set to be long and the lengths of the knitting yarns passing through the outer braiding route are set to be short. 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 all of the above objectives, the method for manufacturing a bag knit structure according to the present invention is such that a plurality of yarn bobbin carriers divided into two sets are moved in opposite directions to each other along a bag knitting braiding path. In a method for producing a bag knit structure of a single interlaced layer, in which the knitting yarn is fed out while moving, and the knitting yarn is intertwined from the inside and outside at a plurality of interlacing points to be braided, The ridgeline is braided by moving two sets of yarn bobbin carriers in opposite directions so that the length of the yarn and the knitting yarn passing through the inner braiding path are equal, and the length of the knitting yarn passing through the outer braiding path is The thread bobbin carrier is moved in opposite directions for each set so that the knitting thread becomes longer than the knitting thread passing through the inner braiding path, and the ridge corner where two ridge lines intersect is braided.

[Function] According to the bag knitting structure according to the present invention, the ridge corner where two ridge lines intersect is connected to the knitting yarn passing through the outer braiding path set to a long length and the knitting yarn passing through the inner braiding route set to a short length. Since it is formed by forming and braiding with a relatively large margin, it is possible to avoid the inconvenience of the knitting yarn being bent excessively at the ridge, that is, the corner mentioned above, and as a result, excessive stress is generated in the knitting yarn. You can refrain from doing so.

Further, according to the method for manufacturing a bag knit 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 the ridge lines to form a pair of ridge corners where two ridge lines intersect, the disadvantage of the knitting yarn being extremely folded at the ridge corner, that is, the corner, can be avoided, and excessive stress can be applied to the knitting yarn at the ridge corner. It is possible to manufacture a bag-knitted structure that does not cause generation.

[Example] Embodiments of the present invention will be described below based on the drawings.

FIG. 1A is a model diagram of the knitting yarn path showing one embodiment of the bag knitting structure according to the present invention, and one bag knitting structure l has, for example, a first set of six yarns moving along a clockwise braiding path. Knitting yarn 2A and fJ moving along the counterclockwise braiding path
SZ group 10 knitting yarns 2B are intertwined from inside and outside to form a square shape (
It is knitted into a square tube shape. The knitting yarns of this bag knitting structure l are 2A and 2B - Ct*, carbon am, i lath l@@, ceramic! aIa, metal fiber or a
Fibers (for example, aramid m fibers, phenol fibers, FBI fibers, carbonized fibers, PTEFtJll fibers, etc.) can be used alone or in combination. Then, the intersecting point PI of the knitting yarns 2A and 2B formed on the four ridge lines Xi, X2, X3, and X4 of the bag-knitted braid...
・At P8, between each intersecting point, that is, Pi and Pi, P
3 and P4, P5 and P6, and Pi and P8, the lengths of the knitting yarn 2A passing through the outer braiding route and the knitting yarn 2B passing through the inner braiding route are set to be equal, and the two ridge lines X
Four edge portions Yl, Y2 . Y3. One set is made up of the knitting yarn 2B passing through the outer braiding route with Y4 set to a long length and the knitting thread 2A passing through the inner braiding route set to a short length.

In other words, each ridge corner Yl...between the intersecting points near Y4 (between pa and Pi, between P2 and P3, between P4 and P5,
Knitting yarn 2 passing through the outer braiding path in (between Pl and Pl)
B is made long, and the knitting yarn 2A passing through the inner braiding path is made short.

A set of such bag-knitted structures 1 are assembled by a bag-knitted braiding machine M shown in FIG. This braided alM has eight separate cars A arranged close together in a rectangular (square) ring shape, and each adjacent separate car A
are rotated in opposite directions as shown by the arrows, and four thread bobbin carrier engaging grooves a are formed on the peripheral edge of each separate wheel A at equal intervals of 1 m in the circumferential direction. 1
A first set consisting of 6 thread bobbin carriers bl...b6 shown by white circles, and 10 thread bobbin carriers b7 and 10 thread bobbin carriers b7 shown by black circles. ...B16 is divided into two sets, and each thread bobbin carrier bl...B16 is applied with a -force at a point close to each adjacent wheel A...B16. Another car A
The first set of carriers bl...
While moving b6 along the clockwise braiding route and moving the second set of carriers b7... b16 along the counterclockwise braiding route, each yarn pobbin carrier bt...
. . . It is braided by knitting yarns 2A and 2B that are spun out at predetermined composition points from a yarn bobbin (not shown) held by b16.

As a result, four ridge lines xl in the bag knitted structure 1...
・・・・Between each interlacing point formed on x4, that is, Pl
and P2 , P3 and P4 , P5 and Pl and Pl and P8
In between, the knitting yarn 2A passing through the outer braiding route has a length corresponding to the rotation amount of the rotation angle of 180 degrees of the separate wheel A, and the knitting yarn 2B passing through the inner braiding route has a length similar to the knitting thread A. Other car A
It is braided with a length corresponding to a rotation angle of 180 degrees.

Mata, two ridges X1. ! -X2 ,X2 and X3 ,X
Four ridges Yl and Y2 formed by intersection of 3 and X4
．． Y3. In Y4, the knitting yarn 2B passing through the outer braiding path has a length corresponding to the amount of rotation of the separate wheel A at a rotation angle of 270 degrees,
Also, the rotation angle of the knitting yarn 2A passing through the inner braiding path of another wheel A is 9.
They are made into one set with a length corresponding to the amount of rotation of 0 degrees. - That is, each edge portion Yl, Y2. Y3. In Y4,
The first set of yarn bobbin carriers b1...b6 and the second set of yarn bobbin carriers b7... are arranged so that the knitting yarn 2B passing through the outer braiding path is longer than the knitting yarn 2A passing through the inner braiding path. . . .b16 are moved in opposite directions to braid the edge portions Yl . . . Y4.

Therefore, each of the ridge corners Yl...Y4 can be formed without excessively folding both the knitting yarn 2A passing through the inner path and the knitting yarn 2B passing through the outside path, so that the knitting yarn 2A, Regardless of the elasticity, which varies depending on the type of yarn 2B, the ridges Yl...Y4 can be easily formed, so the range of use of the knitting yarns 2A and 2B is expanded.
Versatility can be improved.

In addition, at each ridge corner Yl...Y4, the knitting yarns 2A and 2B have a length corresponding to the rotation angle of 90 degrees or 270 degrees of the separate wheel A, and are bent with a relative margin. Since the knitting yarns 2A and 2B are formed by combining them into a pair, excessive stress is not generated on the knitting yarns 2A and 2B.
Knitting yarn 2A at each edge Yl...Y4,
Since there is no risk of cutting 2B, each edge corner Yl.
...It is possible to reliably prevent the inconvenience of the braid of the bag-knitted structure l being unraveled due to the cutting of the knitting yarns 2A and 2B occurring at Y4.

In addition, in the bag knitting braiding machine M shown in FIG. ), but the edge angle is 1yt・
...Y4 A central core member (not shown) formed into a rod shape with a substantially square cross section is inserted between the knitting yarns 2A and 2B of each Y4 as an outer core member and is guided from the center hole m of the braid aM. It is covered with an outer shell member made of a cylindrical bag-knit structure body 1, and is used, for example, as a ground packing.

As the core member, a single material such as 1-carved graphite, natural graphite, mica, or vermiculite, or a mixture of two or more of these materials and an appropriate adhesive, formed into a rod shape with a substantially square cross section is used. be done.

Then, a bag-knitted structure l braided by the above-mentioned method
Now, the ridge line XI...x4 and the ridge corner Yl...
...In Y4, the drawer length of knitting yarns 2A and 2B,
In other words, since the lengths between the interlacing points are different and the braiding timing is shifted, the knitting pattern is as shown in FIG. 1B, which is the knitting yarn 2A that braids the ridgeline.

Knitting yarn 2A that braids the ridge corner part from the inclination angle 01 of 2B
, 2B has a larger inclination angle 02.

However, in the conventional bag knitting structure 102 shown in FIG. 9B, 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, so the knitting pattern is as shown in FIG. 9C. As shown in FIG. Inclination angle θ2
(corresponding to the knitting yarns 2A and 2B for braiding the edge portions of the present invention) are equal.

FIG.
The first set of 12 knitting yarns 2A moving along the clockwise braiding route and the second set of 12 knitting threads 2B moving along the counterclockwise knitting route are intertwined from the inside and outside to form a square. It is braided into a cylindrical shape. And the bag braided 4
Two ridges! ! lX1, X2. X3. At the interlacing point Pi...Pl2 of the rail knitting yarns 2A and 2B formed on X4, there is a gap between each interlacing point, that is, between PI and P2. P2 and P3. P
4 and P5 and Pl...PIO and pH, Fil and F
The lengths of the knitting yarn 2A or 2B passing through the outer braiding path between IZ and the knitting yarn 2A or 2B passing through the inner braiding path between IZ are set to be equal, and the lengths of the knitting yarn 2A or 2B passing through the inner braiding path between the two ridge lines xl and X2. X
2 and X3. Four ridges Yl, Y2 . Y3. Y4 is braided with a knitting yarn 2A or 2B passing through an outer braiding path set to a long length and a knitting yarn 2A or 2B passing through an inner braiding route set to a short length. In other words, each ridge corner yt......between the intersection points near Y4 (between Pl2 and PI, between P3 and P4, between Pl
and PI, between P9 and PlO), the knitting yarn 2A or 2B passing through the outer braiding path is made longer.

The knitting yarn 2A or 2B 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 bag-knitting braiding machine M has 12 pulleys A arranged close together in a rectangular (square) ring shape so that each pulley 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 two
Four thread bobbin carriers bi...b24 are indicated by white circles. Twelve thread bobbin carriers bl...b1
The first set consists of 2 bobbin carriers b13...b24, and the second set consists of 12 thread bobbin carriers b13...b24 shown by black circles. b24
is sequentially transferred from one pulley A to the other pulley A at a point close to each adjacent separate wheel A, thereby transferring the first set of carriers b1... b12 along the clockwise braiding path, and attach the second set of carriers b13.
...Knitting yarn is paid out to a predetermined composition point from a yarn bobbin (not shown) held by each yarn bobbin carrier b1 ... b24 while ...b24 is guided along the counterclockwise braiding path. It is braided by 2A and 2B.

As a result, four ridge lines Xi in one bag knitting structure l...
・・・・Between each interlacing point formed on X4, that is, Pl
and P2, P3 and P4, P5 and Pl and PI and P8
In between, the knitting yarn 2A passing through the outer braiding route has a length corresponding to the amount of rotation of the pulley A at a rotation angle of 180 degrees, and the knitting yarn 2B passing through the inner braiding route has the same length as the knitting thread A. Pulley A
One braid has a length corresponding to the amount of rotation of 180 degrees.

Mata, two ridgelines XI! :X2,X2! :X3,X
Four ridges Yl and Y2 formed by intersection of 3 and x4
．． Y3. In Y4, the knitting yarn 2B passing through the outer braiding path has a length corresponding to the amount of rotation of the separate wheel A at a rotation angle of 270 degrees,
Also, the rotation angle of the knitting yarn 2A passing through the inner braiding path of another wheel A is 9.
The braid will have a length corresponding to the amount of rotation of 0 degrees. Therefore, it is possible to achieve the same effect as the bag knit structure I having the knitting yarn path shown in FIG. 1A, which is braided by the bag knit braiding machine M shown in FIG. 2. In addition, also in this bag knitting braid fiM, the core yarn is led out from the through hole al in the center of the separate wheel A arranged at the four corners, and
l...Y4 is inserted between the knitting yarns 2A and 2B as an outer core member, and the inner core member led out from the center hole m is formed by an outer shell member consisting of a tubular bag-knitted structure l. However, for the same reason as mentioned above, the knitting pattern is such that the inclination angle al of the knitting yarns 2A and 2B that knits the ridge lines is smaller than the knitting pattern that braids the ridge corners, as shown in FIG. 3B. The inclination angle θ2 of the threads 2A and 2B is larger.

In each of the above embodiments, a square tubular bag-knitted structure l and a method for manufacturing the same have been described. As shown in FIG. The adjacent separate wheels A are driven to rotate in opposite directions to each other as shown by the arrows, and four thread bobbin carrier engaging grooves a are formed at equal intervals in the circumferential direction on the peripheral edge of each separate wheel A. 24 thread bobbin carriers b1...
・12 thread bobbin carriers bi with b24 indicated by white circles・
... Divided into two sets, the first set consisting of b12 and the second set consisting of 12 thread bobbin carriers b13...b24 indicated by black circles, each thread bobbin carrier bl...
... b24 is transferred from the retaining groove a of one separate car A to the engagement groove a of the other separate car A one by one at the proximity point of each adjacent separate car A... By using the bag-knitting braiding machine M, it is possible to manufacture a bag-knitted structure l having a rectangular cylindrical shape as shown in FIG.

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

According to the bag knitting structure of Claim (1), the ridge corner where two ridge lines intersect is compared between the knitting yarn passing through the outer braiding route set to a long length and the knitting yarn passing through the inner braiding route set to a short length. Since it is formed by bending and braiding with sufficient margin, it is possible to avoid the inconvenience of the knitting yarn being bent excessively at the ridge corners, that is, the four corners. Regardless of the shape, the ridge can be easily formed, so the range of use of the knitting yarn can be expanded and its versatility can be improved. In addition, the knitting yarn is not folded too much at the ridge corner, and is assisted with a relatively large margin, thereby suppressing the generation of excessive stress on the knitting yarn, thereby preventing the knitting yarn from breaking at the ridge corner. , it is possible to reliably prevent the inconvenience that the braid of the bag-knitted structure is 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-knitted structure according to claim (2), the yarn bobbin carriers are arranged for each set so that the yarn passing through the outer braiding path is longer than the yarn passing through the inside braiding path. By moving in opposite directions and braiding the ridge corner where two ridge lines intersect.

The use of knitting yarn avoids the inconvenience of the knitting yarn being extremely bent at the ridges, that is, the four corners, and therefore the ridges can be easily formed regardless of the degree of elasticity, which varies depending on the type of knitting yarn. The range can be expanded and its versatility can be improved, and the knitting yarn is folded extremely at the ridge corner, and the knitting yarn is folded with a relatively large margin, which prevents excessive stress from being generated in the knitting yarn. This prevents the knitting yarn from being cut at the ridge corners, thereby reliably preventing the inconvenience of unraveling the entire braid due to this cutting, and omitting the process of pressure forming into a square cross section using rolls or molds. Thus, a bag knitted structure can be easily manufactured.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 to 6 show embodiments of the present invention, FIG. 1A is a model diagram of a knitting yarn path showing an embodiment of a bag knitting structure, and FIG. An explanatory diagram showing the self-knitting pattern of the bag-knitted structure shown in the figure, fJS2 shows the arrangement Ifl of the separate car group of the braiding machine for the bag-knitted structure shown in Fig. 1A, and Fig. 3A shows another implementation of the bag-knitted structure. A model diagram of a knitting yarn path showing an example, FIG. 3B is an explanatory diagram showing a stitch pattern of the bag knit structure of FIG. 3A,
4 is a layout diagram of the impeller group of the braiding machine for bag knit structures shown in FIG. 3A, FIG. 5 is a modified layout diagram of the impeller group of the braiding machine for bag knit structures, and FIG. FIG. 7 is a schematic perspective view of a bag-knitted structure braided by the braiding machine shown in the figure, FIG. 7 is a sectional view showing an example of a conventional cored braided packing, and FIG. An explanatory diagram showing an example of the arrangement, Fig. 8B is a model diagram of the knitting yarn path of the bag knit structure braided by the braiding machine of Fig. 8A, and Fig. 9A is an illustration of the arrangement of the impeller group of the conventional one-piece knitting machine. An explanatory diagram showing another example, FIG. 9B is a model diagram of the knitting yarn path of the bag knit structure braided by the braiding machine of FIG. 9A, and FIG. 9C is a model diagram of the knitting yarn path of the bag knit structure of FIG. 9B. The explanatory diagram shown in FIG. 10 is a cross-sectional view of the packing base material containing a core. l... Bag knitting structure 2A, 2B... Knitting yarn bl, b2...... Yarn bobbin carrier P
2... Intersecting point Xt...x4...Ridge l...Y4...Rid corner patent artificial tree Pillae Gyo Co., Ltd.

Claims (2)

[Claims] (1) In a bag-knitted structure with a single interlaced layer, the knitting yarn passes through the outer braiding route and the inner braiding route between the interlacing points formed on the ridgeline of the bag-knitting braided by interlacing the knitting yarns from the inside and outside. The length of the knitting yarns is set to be equal, and the ridge corner where two ridge lines intersect is braided by the knitting yarn passing through the outer braiding route set to a long length and the knitting yarn passing through the inner braiding route set to a short length. Features a bag-knit structure. (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, intertwining the knitting yarns from the inside and outside at multiple interlacing points. In the method for manufacturing a bag-knitted structure of a single interlaced layer, the lengths of the knitting yarns passing through the outer braiding route between the interlacing points and the knitting yarns passing through the inner braiding route between the interlacing points are equal to each other. The thread bobbin carriers are moved in opposite directions in each set to braid the ridgeline, and the thread bobbin carriers are moved in 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 edges are moved in opposite directions to braid a ridge corner where two ridge lines intersect.