JP3021005B2 - Carcass ply cord knitting method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of knitting a substantially toroidal carcass ply cord, which is a skeleton of a pneumatic tire, by alternately engaging a cord with a pair of beads.

2. Description of the Related Art Conventionally, as a method of knitting a cord for a carcass ply, for example, a method described in Japanese Patent Publication No. 57-26941 is known. In this method, a cord is guided to one bead, the cord is passed through a loop formed when the bead was previously locked to the bead, and the cord is locked to the bead by an operation similar to crochet knitting. And a loop is formed for the next time, and then the cord is guided along the toroidal core mold to the other bead, and the cord is inserted into the loop formed when the bead was previously locked to the bead. After passing through, the operation of locking the cord to the bead by an operation similar to the crochet knitting and forming a loop for the next time was performed while rotating the core mold by a predetermined angle, and it was substantially toroidal. Carcass ply cords are knitted.

Problems to be Solved by the Invention Here, in the method for knitting a cord for a carcass ply as described above, the loop is formed on the radially outer surface side of the bead, and a portion where such a loop is formed Is easy to accumulate air, and since the outer surface side in the radial direction as described above is a place where it is difficult to apply an external force during vulcanization, it is difficult to completely extrude air during vulcanization, and air accumulation may occur. There is a problem. In addition, when a filler is installed in such a bead, a cord is interposed between the bead and the filler to cause incomplete crimping between the bead and the filler. However, there is also a problem that the durability is reduced because it does not exist.

An object of the present invention is to provide a method for knitting a cord for a carcass ply, which can prevent the occurrence of air pockets, and can improve the bonding property between a bead and a filler and the durability of the bead.

Means for Solving the Problems Such an object is achieved firstly by folding the cord near the outside of one bead in the axial direction, and then turning the cord near the outside of the other bead in the axial direction. A method of knitting a carcass ply cord having a substantially toroidal shape, in which after being folded in the vicinity of the inside in the direction, the operation of folding in the vicinity of the inside of the other bead in the axial direction is continuously performed while being shifted by a predetermined pitch in the circumferential direction of the bead. , At the fold of the code located axially outside the bead, at the fold of the code located axially inside the next adjacent bead,
The bead is inserted through the radially inner surface of the bead, and then the fold of the cord located axially inward of the bead is replaced by the fold of the cord located axially outward of the next adjacent bead. Inserted through the inner side,
Secondly, by knitting a cord for a carcass ply in which the cord is alternately and alternately wound between the beads, second, after the cord is folded near the outside in the axial direction of one bead,
Folding near the outside of the other bead in the axial direction, then turning near the inside of the other bead in the axial direction, and then turning back near the inside of the other bead in the axial direction, continuously shifting the bead in the circumferential direction by a predetermined pitch. It is a method of knitting a carcass ply cord having a substantially toroidal shape, wherein the folded portion of the cord located axially outside of each bead and the folded portion of the cord located axially inside of the bead, This can be achieved by a method of knitting a cord for a carcass ply in which the cords are alternately hooked by lower cords extending along the radial inner surface of the beads, and the cords are bridged between the beads.

In the invention according to the first aspect of the invention, the cord is folded near the outside of the one bead in the axial direction, then folded near the outside of the other bead in the axial direction, and then folded near the inside of the one bead in the axial direction. After that, the operation of folding the other bead in the vicinity of the inner side in the axial direction is continuously performed while being shifted by a predetermined pitch in the circumferential direction of the bead, and the cord for the carcass ply in a substantially toroidal shape is knitted. In the folded portion of the cord located on the outer side in the direction, the folded portion of the code located on the inner side in the axial direction of the next adjacent bead is inserted through the radially inner surface side of the bead,
Next, the folded portion of the code located on the axially outside of the next adjacent bead is inserted into the folded portion of the code located on the axially inside of the bead through the radially inner surface side of the bead, and the beads are sequentially and alternately turned on. The code is passed between them. Therefore, the folded ends of the cords located outside and inside the bead in the axial direction are both present on the radially inner surface side of the bead. Here, the folded ends of such cords are liable to generate air pockets similarly to the above-described loop, but the radially inner surface side of the bead where these folded ends exist is a place where external force is likely to act during vulcanization. In addition, the air is reliably expelled during vulcanization, and the occurrence of air pockets can be prevented. Moreover, in the invention according to the first aspect, the cord located on the outside in the axial direction of the bead and the cord located on the inside in the axial direction are inserted and connected on the inner side in the radial direction of the bead. There is no code on the side. Therefore, when the filler is provided on the bead, the filler can be securely pressed against the outer surface in the radial direction of the bead.
Further, at this time, the filler is disposed between the cord located outside the bead in the axial direction and the cord located inside the bead in the axial direction, so that the bead durability is improved.

Also, in the invention described in claim 2, the folded portion of the cord located on the outside in the axial direction of the bead and the folded portion of the cord located on the inside in the axial direction are alternately arranged by the lower cord located on the inner surface side in the radial direction of the bead. As described above, the occurrence of air pockets can be prevented, and the press-bonding property between the bead and the filler and the durability of the bead can be improved as described above.

Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

In FIG. 1, reference numeral 1 denotes a knitting device, and the knitting device 1 has a horizontal main shaft 2. The main shaft 2 is intermittently rotated by a predetermined angle by a rotation mechanism (not shown), and is reciprocated in the axial direction by a reciprocation mechanism (not shown). A support 5 is provided outside the center of the main shaft 2.
Are fixed, and radially inner ends of a plurality of link mechanisms 6 are connected to the support 5. A plurality of divided cores 7 are connected to a radially outer end of each link mechanism 6,
The core 7 moves in the radial direction and expands / contracts by the link mechanism 6 swinging synchronously by an expansion / contraction mechanism (not shown). These cores 7 have a drum shape as a whole when the diameter is expanded. Blocks 11 and 12 are fixed to the main shafts 2 on both sides in the axial direction of the support body 5, and a plurality of circumferentially spaced receivers 15 and 16 are connected to these blocks 11 and 12 via pins 13 and 14. Then, the receivers 15 and 16 are rotated about the pins 13 and 14 by a rotation mechanism (not shown). Beads 21 and 22 constituting a pneumatic tire are seated on the outer sides of these receivers 15 and 16 in the radial direction, respectively. Reference numerals 23 and 24 are fillers whose inner ends in the radial direction are pressure-bonded to the outer surfaces of the beads 21 and 22 in the radial direction. These fillers 23 and 24 are made of rubber having high hardness. 31, 32
Are movable blocks installed on the outside of the receivers 15 and 16 in the axial direction, respectively. These movable blocks 31 and 32 move together with the main shaft 2 when the main shaft 2 moves in the axial direction, but when the main shaft 2 rotates, It is stationary regardless of the rotation.
The movable blocks 31 and 32 can be moved in the axial direction independently of the main shaft 2 by a drive mechanism (not shown). The movable blocks 31 and 32 support rotating tables 33 and 34, respectively. The rotating tables 33 and 34 are rotated by 180 degrees about a vertical axis by a rotating mechanism (not shown). In addition, hooks for hooking a cord, which will be described later, are
35, 36 are attached. A code supply mechanism 40 is provided above the main shaft 2, and the code supply mechanism 40 is a guide.
The needle 41 has a needle 42 supported so as to be able to move up and down. A cord 45 unwound from a reel 44 is guided through a hole 43 formed at the lower end of the needle 42. Here, the cord 45 is made of a monocord (single filament) or a twisted cord, and is made of textile, steel or aramid fiber.

Next, the operation of the first embodiment of the present invention will be described.

When knitting a carcass ply cord using the knitting device 1 described above, first, beads 21 and 22 with fillers 23 and 24 are seated on receivers 15 and 16 and then reels 44.
And the start end of the cord is passed through the hole 43 of the needle. In this state, the needle 42 is lowered by the operation of the cord supply mechanism 40 while passing through the outside of the filler 23 in the axial direction, and the cord 45 is supplied to the vicinity of the bead 21 in the axial outside. The unwinding start end of the cord 45 is held in the vicinity of the receiver 15 by a not-shown stopper. Next, the movable block 31 is moved inward in the axial direction by the
Hook code 45. Next, when the needle 42 is raised, the cord 45 is folded at a position where the cord 45 is hooked on the hook 35. Next, after the receiver 15 facing the movable block 31 is rotated around the pin 13 by the rotation mechanism and retracted, the hook 35 hooking the movable block 31 and the cord 45 is moved in the radial direction of the bead 21. Move axially inward on the inside. And this movable block 31
Is stopped when the hook 35 reaches a position axially inward from the inner side surface of the bead 21 by a predetermined distance. As a result, the cord 45 hooked on the hook 35
The folded portion 46 (see FIG. 2) extends inward in the axial direction of the bead 21 along the inner surface of the bead 21 in the radial direction. Next, the main shaft 2 is moved leftward in FIG. 1 by the reciprocating mechanism until the block 12 reaches directly below the needle 42.

Next, the needle 42 descends while passing through the filler 42 in the axial direction, and the cord 45 is supplied to the vicinity of the bead 22 in the axial direction. With the above operation, code 45 is filled with filler 2
3, extending along the outside of the core 7 and the filler 24, and has a substantially toroidal shape as a whole. Next, the movable block 32 is moved inward in the axial direction to hook the cord 45 with the hook 36, and then the needle 42 is raised. Next, after the receiver 16 retracts, the movable block 32 and the hook 36 move inward in the axial direction while the card 45 is hooked. This results in a hook
The folded portion 46 of the cord 45 hooked on 36 extends along the radially inner surface of the bead 22 toward the inside of the bead 22 in the axial direction. Next, the main shaft 2 moves rightward, and the needle 42 reaches between the core 7 and the filler 23. The above operation is a preparation stage.

Next, start knitting. In this case, first,
The needle 42 descends to the vicinity of the inside of the bead 21 in the axial direction while passing through the inside of the filler 23 in the axial direction, and enters the folded portion 46 of the cord 45 hooked on the hook 35. Thereby, the cord 45 penetrating the hole 43 of the needle 42
Is supplied to the vicinity of the inside of the bead 21 in the axial direction,
It enters into the folded portion 46. By the above operation, the cord 45 is outside the filler 24, outside the core 7, and the filler 23.
Extends along the inside of the body and has a substantially toroidal shape as a whole. Next, the rotating table 33 and the hook 35 are rotated by the rotating mechanism.
Rotated 180 degrees. As a result, the hook 35 becomes
6 while being folded back by the needle 42.
Hook cord 45 supplied inside. As a result, the folded portion 46 is hooked on the cord 45 located inside the bead 21 in the axial direction. Next, after the needle 42 rises, the movable block 31 and the hook 35 move outward in the axial direction while the cord 45 is hooked. As a result, the folded portion 47 (see FIG. 2) of the cord 45 hooked on the hook 35 extends along the radially inner surface of the bead 21 toward the outside of the bead 21 in the axial direction. Next, the main shaft 2 moves to the left, and the needle 42 reaches between the core 7 and the filler 24.

Next, the needle 42 descends to the vicinity of the inside of the bead 22 in the axial direction while passing through the inside of the filler 24 in the axial direction, and enters the folded portion 46 of the cord 45 hooked on the hook 36. As a result, the cord 45 penetrating through the hole 43 of the needle 42 is supplied to the vicinity of the inside of the bead 22 in the axial direction, and also enters the folded portion 46. With the above operation, the cord 45 extends along the inside of the filler 23, the outside of the core 7, and the inside of the filler 24, and has a substantially toroidal shape as a whole. Next, the turntable 34 and the hook 36 are turned 180 degrees. As a result, the hook 36 is detached from the folded portion 46, and the hook 45 hooks the cord 45 supplied into the folded portion 46 by the needle 42. Thereby, the folded portion
46 is hooked on the cord 45 located inside the bead 22 in the axial direction. Next, after the needle 42 rises, the movable block 32 and the hook 36 move outward in the axial direction with the cord 45 hooked. As a result, the folded portion 47 of the cord 45 hooked on the hook 36 extends along the radially inner surface of the bead 22 toward the outside of the bead 22 in the axial direction. Next, the main shaft 2 and the core 7 are rotated by a predetermined angle, and the braided cord 45 is shifted in the circumferential direction by a predetermined pitch. Next, the main shaft 2 moves rightward until the needle 42 reaches just above the block 11.

Next, the needle 42 is lowered while passing the outside of the filler 23 in the axial direction, and the cord 45 passed through the needle 42 is supplied to the vicinity of the outside of the bead 21 in the axial direction. By the above operation, the cord 45 extends along the inside of the filler 24, the outside of the core 7, and the outside of the filler 23, and has a substantially toroidal shape as a whole. Next, the turntable 33 and the hook 35 are rotated by 180 degrees, and the hook 35 is detached from the folded portion 47, while the needle 45 hooks the cord 45 supplied into the folded portion 47. As a result, the folded portion 47 is hooked on the cord 45 located outside the bead 21 in the axial direction. Next, after the needle 42 is moved up, the movable block 31 and the hook 35 are moved inward in the axial direction while the hook 45 is hooked on the cord 45. In the same manner as in the above, it is extended toward the inside of the bead 21 in the axial direction while being along the inner surface of the bead 21 in the radial direction. Next, the main shaft 2 moves to the left, and the needle 42 reaches just above the block 12.

Next, the needle 42 descends while passing outside the filler 24 in the axial direction. As a result, the cord 45 passed through the needle 42 is supplied to the vicinity of the outside of the bead 22 in the axial direction, and at the same time, enters the folded portion 47. By the above operation, the cord 45 extends along the outside of the filler 23, the outside of the core 7, and the outside of the filler 24, and has a substantially toroidal shape as a whole. Next, the turntable 34 and the hook 36 are turned 180 degrees. As a result, the hook 36 is separated from the folded portion 47, and the hook 45 hooks the cord 45 supplied into the folded portion 47 by the needle 42. As a result, the folded portion 47 is hooked on the cord 45 located outside the bead 22 in the axial direction. Next, after the needle 42 is lifted, the movable block 32 and the hook 36 move inward in the axial direction while the cord 45 is hooked, so that the folded portion 46 of the cord 45 hooked on the hook 36 is In the same manner as described above, it extends along the radially inner surface of the bead 22 toward the axially inner side of the bead 22. Next, the spindle 2 moves to the right,
The needle 42 reaches between the core 7 and the filler 23.

The above is one cycle of the knitting operation. Thereafter, this cycle is repeated continuously, and the carcass ply cord 50 having a substantially toroidal shape as shown in FIG. 3 is knitted. At this time, as described above, the folded portion 46 of the cord 45 located outside the beads 21 and 22 in the axial direction is
45 located axially inward along the radially inner surface of
While extending the hooks on the cord 45 located on the inner side in the axial direction, and folding the folded portion 47 of the cord 45 located on the inner side in the axial direction of the beads 21 and 22 to the outer side in the axial direction along the radially inner surfaces of the beads 21 and 22. The cord 45 is extended to the cord 45 located on the outside and hooked on the cord 45 located outside in the axial direction so that the cord 45 is locked to the beads 21 and 22, respectively. For this reason, the folded ends of the cords 45 located outside and inside the beads 21 and 22 in the axial direction are both present on the radially inner surfaces of the beads 21 and 22. Where code like this
Although the folded ends of the 45 are likely to generate air pockets similarly to the loop in the prior art, the radially inner surfaces of the beads 21 and 22 where these folded ends are located are locations where external force is likely to act during vulcanization. The removal of air during the sulfurization is reliably performed, and the occurrence of air pools can be prevented.
Moreover, in the first embodiment, the cord 45 located on the outside in the axial direction of the beads 21 and 22 and the cord 45 located on the inside in the axial direction are hooked and connected on the radially inner side of the beads 21 and 22. The cord 45 does not exist on the radially outer surface side of the beads 21 and 22. For this reason, filler 23,
When 24 is provided on the beads 21 and 22, these fillers 23 and 24
Can be securely pressed against the radially outer surfaces of the beads 21 and 22. Further, at this time, the fillers 23 and 24 are beads.
Since it is arranged between the cord 45 located on the outside in the axial direction and the cord 45 located on the inside in the axial direction, the bead durability is improved. When the work of forming the carcass ply cord 50 is completed, the start and end of the cord 45 are beaded.
Tied by hand or the like on the radial inner surface of 21 (or bead 22).

4 and 5 show a second embodiment of the present invention.
In this embodiment, the main shaft 52 is capable of pivoting movement in the axial direction, that is, in the horizontal direction in FIG. 4, but cannot rotate. In addition, a plurality of rollers 55 and 56, which are circumferentially separated from each other, are rotatably supported by the blocks 53 and 54 fixed to the main shaft 52, and the rollers 23 and 24
Beads 21 and 22 are rotatably supported. These beads 21 and 22 are intermittently rotated by a predetermined angle by a drive mechanism (not shown). In this embodiment, the support 5, the link mechanism 6 and the core 7 can also rotate with respect to the main shaft 2 in synchronization with the intermittent rotation of the beads 21 and 22. Also, in the blocks 53 and 54, a baffle 59 (only the left one is shown in FIG. 4) for supplying the lower cords 57 and 58 is arranged at substantially the same angular position. The other configuration is the same as that of the first embodiment. When the cord 50 for carcass ply as shown in FIG. 3 is knitted by such a knitting device, the needle 42 is lowered to supply the cord 45 to the vicinity of the outside of the bead 21 in the axial direction. The lower cord 57 is hooked on the cord 45. Next, when the needle 42 is raised, the cord 45 is folded back outside the bead 21 in the axial direction.
57 is hooked on the folded portion 61. next,
After the main shaft 52 is pivoted to the left in FIG. 4 so that the claw 59 is aligned with the position below the needle 42, the needle 42 is lowered to supply the cord 45 to the vicinity of the bead 22 in the axial direction. Next, the lower cord 58 is hooked on the cord 45 by a notch 59 not shown. Next, when the needle 42 is raised, the cord 45 is folded back outside the bead 22 in the axial direction. At this time, the lower cord 58 is hooked on the folded portion 61. Next, the main shaft 52 is pivoted to the right in FIG. 4 so that the line connecting the stud 59 and the needle 42 matches the axially inner space of the bead 21, and then the needle 42 is lowered to move the cord 45 to the bead 21. Is supplied in the vicinity of the inside in the axial direction. Next, the lower cord 57 is hooked on the cord 45 by the stirrup 59. Next, when the needle 42 is raised, the cord 45 is folded back inside the bead 21 in the axial direction. At this time, the lower cord 57 is
Will be caught in Next, the main shaft 52 is pivoted to the left so that the line connecting the stud 59 and the needle 42 is aligned with the axially inner space of the bead 22, and then the needle 42 is lowered to move the cord 45 to the axially inner side of the bead 22. Supply nearby. next,
The lower code 58 is converted to the above code by a camera 59 (not shown).
Hook on 45. Next, when the needle 42 is raised, the cord 45 is folded back inside the bead 22 in the axial direction. At this time, the lower cord 58 is hooked on the folded portion 62. Next, beads with fillers 23 and 24
21 and 22, the support 5, the link mechanism 6 and the core 7 are rotated by a predetermined angle, and are shifted in the circumferential direction by a predetermined pitch. Then, such an operation is repeated alternately and continuously to form a carcass ply cord 50 as shown in FIG. Here, since the lower cords 57 and 58 are alternately hooked on the folded portions 61 of the cords located outside the beads 21 and 22 in the axial direction and the folded portions 62 of the cord 45 located inside the beads in the axial direction, these beads are used. It extends along the inner surface in the radial direction of 21 and 22 while being bent substantially zigzag. The other operations are the same as in the first embodiment.

In the above-described embodiment, the cord supply mechanism 40 is stopped and the main shaft 2 is moved in the axial direction. However, in the present invention, the main shaft 2 is stopped and the cord supply mechanism 40 is moved in the axial direction. Is also good.

Effects of the Invention As described above, according to the present invention, it is possible to prevent the occurrence of air pockets, and to improve the pressure-bonding property between the bead and the filler and the durability of the bead.

[Brief description of the drawings]

FIG. 1 is a partially broken front view showing a first embodiment of the present invention,
FIG. 2 is a partial perspective view showing the folded portion and the vicinity of the bead, FIG. 3 is a perspective view showing a part of a carcass ply cord, FIG. 4 is a partially cutaway front view showing a second embodiment of the present invention, FIG. FIG. 5 is a partial perspective view of the folded portion and the vicinity of the bead. 21, 22 ... Bead, 45 ... Code 46, 47 ... Folding part 50 ... Carcass ply cord 57, 58 ... Lower code, 61, 62 ... Folding part

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. ⁷ , DB name) B29D 30/00-30/72 B60C 9/00-9/08 D04B 25/14

Claims (2)

(57) [Claims] 1. A cord is folded near the outside of one bead in the axial direction, then is folded near the outside of the other bead in the axial direction, and then is folded near the inside of one bead in the axial direction. A method of knitting a substantially toroidal-shaped carcass ply cord by performing a turn-back operation in the vicinity of the inside in the axial direction while continuously shifting the bead in the circumferential direction by a predetermined pitch, wherein the cord is positioned outside the bead in the axial direction. In the part, the folded part of the cord located axially inward of the next adjacent bead is inserted through the radially inner side of the bead, and then the folded part of the cord located axially inward of the bead is The folded part of the cord located on the outside of the adjacent bead in the axial direction is inserted through the radially inner surface side of the bead, and the cord is alternately put between the beads in turn. How braided cord carcass ply, characterized in that the Suyo. 2. The method according to claim 1, wherein the cord is folded near the outside of the other bead in the axial direction, then folded near the outside of the other bead in the axial direction, and then folded near the inside of the one bead in the axial direction. A method of knitting a carcass ply cord having a substantially toroidal shape, in which the operation of folding back near the inner side in the axial direction is continuously performed while shifting the bead in the circumferential direction by a predetermined pitch, and the cord located on the outer side in the axial direction of each bead. And the folded portion of the cord located on the inner side of the bead in the axial direction are alternately hooked by the lower cord extending along the radially inner surface of the bead,
A method for knitting a cord for a carcass ply, wherein the cord is stretched between beads.