JPH0480021A - Method for knitting of cord for carcass ply - Google Patents

Abstract

PURPOSE:To prevent air stay from occurrence and to improve press-bonding properties between a bead and a filler and durability of the bead by a method wherein a folded part of an inside cord of the next bead is inserted in a folded part of an outside cord in the shaft direction of the bead through the inner face side of the bead and the folded part of the outside cord of the next bead is inserted in the folded pat of the inside cord of the bead and the cord is bridged between the beads. CONSTITUTION:A folded part 4b of a code 45 positioned on the outside in the shaft direction of beads 21 and 22 is extended to a cord positioned on the outside in the shaft direction along the inner face in the radial direction of the beads 21 and 22 and is hanged on the cord 45 positioned on the inside in the width direction and a folded part 47 of the cord 45 positioned on the inside in the shaft direction of the beads 21 and 22 is extended to the cord 45 positioned on the outside in the shaft direction along the inner face in the radial direction of the beads 21 and 22 and is hanged on the cord 45 positioned on the outside in the shaft direction. Then, the cord 45 positioned on the outside in the shaft direction of the beads 21 and 22 and the cord 45 positioned on the inside in the shaft direction are hanged and connected with each other on the inner face side in the radial direction of the beads 21 and 22.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of knitting a carcass ply cord having a substantially toroidal shape, which is the skeleton of a pneumatic tire, by alternately locking the cord to a pair of beads.

As a method for knitting a cord for carcass ply, for example, the method described in Japanese Patent Publication No. 57-26941 is known. In this method, the cord is guided to one bead, passed through the loop that was formed when the bead was last latched, and then the cord is latched to the bead using an operation similar to crochet knitting. Next, guide the cord along the toroidal-shaped core mold to the other bead, and insert the cord into the loop formed when the bead was last locked. After threading, the cord is locked to the bead by an operation similar to crochet knitting, and a loop is formed for the next time while rotating the core mold by a predetermined angle. I am trying to knit the carcass ply cord.

However, in the method of knitting a carcass ply cord as described above, the loops are formed on the outer surface side in the radial direction of the bead, but there are no holes in the areas where such loops are formed. Air tends to accumulate, and as mentioned above, the radial outer surface is a place where it is difficult to apply external force during vulcanization, so it is difficult to completely push out air during vulcanization, and air pockets may occur. There is a problem. In addition, when a filler is installed on such a bead, there is a problem that a cord is interposed between the bead and the filler, resulting in incomplete crimping between the bead and the filler. There is also the problem that durability is low because there is no

SUMMARY OF THE INVENTION 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 pressure bond between the bead and the filler and the durability of the bead.

The purpose of this is to first fold the cord back near the axially outer side of one bead, then fold it back near the axially outer side of the other bead, and then fold it back near the axially inner side of the other bead. This is a method of knitting a carcass ply cord having a substantially toroidal shape by repeatedly folding it back near the inside of the other bead in the axial direction while shifting the bead by a predetermined pitch in the circumferential direction of the bead. A folded part of the cord located on the axially outer side of the next adjacent bead is inserted through the radially inner side of the bead, and then a folded part of the cord located on the axially inner side of the bead is inserted into the folded part of the cord located on the axially inner side of the bead. The folded part of the cord located on the axially outer side of the next adjacent bead is inserted through the inner side of the bead in the radial direction, and the cord is sequentially and alternately passed between the beads. According to the method of knitting carcass ply cords, secondly, the cord is folded back near the axially outer side of one bead, then folded back near the axially outer side of the other bead, and then folded back near the axially inner side of one bead. A method of knitting a carcass ply cord in a substantially toroidal shape by repeatedly folding it back near the inside of the other bead in the axial direction while shifting the bead by a predetermined pitch in the circumferential direction of the bead. The folded portions of the cord located on the axially outer side of the bead and the folded portions of the cord located on the axially inner side of the bead are hooked alternately by the lower cord extending along the radially inner surface of the bead, and the cord is inserted between the beads. This can be achieved by the method of knitting the carcass ply cord in such a way that it is passed over the carcass ply cord.

In the invention set forth in claim 1, the cord is folded back near the axially outer side of one bead, then folded back near the axially outer side of the other bead, and then folded back near the axially inner side of one bead. After that, the action of folding back near the axially inner side of the other bead is performed continuously while shifting the bead by a predetermined pitch in the circumferential direction of the bead to knit a roughly toroidal-shaped carcass ply cord. A folded portion of a cord located on the axially inner side of the next adjacent bead is inserted into the folded portion of the cord located on the axially outer side of the bead through the radially inner side of the bead,
Next, the folded part of the cord located on the axially inner side of the bead is inserted into the folded part of the cord located on the axially outer side of the next adjacent bead through the radially inner side of the bead, and the bead is sequentially and alternately inserted. I'm trying to pass a code between them. Therefore, the folded ends of the cord located on the axially outer and inner sides of the bead both exist on the radially inner side of the bead. Here, air pockets are likely to occur at the folded ends of such cords, similar to the aforementioned loops, but the radially inner surface of the bead where these folded ends exist is a place where external force is likely to be applied during vulcanization. Air is reliably expelled during vulcanization, and air pockets can be prevented from forming. Moreover, in the invention according to claim 1, since the cord located on the axially outer side of the bead and the cord located on the axially inner side of the bead are inserted and connected on the radially inner side of the bead, the radially outer surface of the bead There are no cords on the sides, so that if a filler is provided on the bead, it can be reliably crimped onto the radially outer surface of the bead. Furthermore, at this time, since the filler is disposed between the cord located on the axially outer side of the bead and the cord located on the axially inner side of the bead, the bead durability is improved.

Also, in the invention according to claim 2, the folded portions of the cord located on the axially outer side of the bead and the folded portions of the cord located on the axially inner side of the bead are alternately arranged by the lower cord located on the radially inner side of the bead. Since the bead is hooked and connected to the bead, as described above, it is possible to prevent the occurrence of air pockets, and it is also possible to improve the pressure bonding properties between the bead and the filler and the durability of the bead.

Moxibustion [ Hereinafter, a first embodiment of the present invention will be described based on the drawings.

In FIG. 1, 1 is a knitting device, and this knitting device 1 has a horizontal main shaft 2. In FIG. The main shaft 2 is intermittently rotated by a predetermined angle by a rotation mechanism (not shown) and reciprocated in the axial direction by a reciprocating mechanism (not shown). A support 5 is provided outside the center of the main shaft 2.
is fixed, and the radially inner ends of a plurality of link mechanisms 6 are connected to the second support body 5. A core 7 divided into a plurality of pieces is connected to the radially outer end of each ring mechanism 6,
This core 7 moves in the radial direction and expands and contracts as the ring mechanism 6 oscillates in synchronization with an expansion and contraction mechanism (not shown). These cores 7 have a drum-like shape as a whole when expanded in diameter.

Blocks 11 are provided on the main shaft 2 on both sides of the support body 5 in the axial direction.
12 are respectively fixed and these blocks 11.12
A plurality of receivers 15.16 spaced apart in the circumferential direction are connected to each other via bins 13.14, and each receiver 15.16 is rotated about the bin 13.14 by a rotation mechanism (not shown). Beads 21, 22 constituting a pneumatic tire are seated on the radially outer sides of these receivers 15, 16, respectively. Fillers 23 and 24 have their radially inner ends pressed onto the radially outer surface of the beads 21 and 22, and these fillers 23 and 24 are made of hard rubber. Reference numerals 31 and 32 denote movable blocks installed on the outside of the receivers 15 and 16 in the axial direction, and these movable blocks 31 and 32 move together with the main shaft 2 when the main shaft 2 moves in the axial direction. When it rotates, it remains stationary regardless of the rotation. Further, these movable blocks 3132 can be moved in the axial direction independently from the main shaft 2 by a drive mechanism (not shown). Rotating tables 33, 34 are supported by these movable blocks 31, 32, and these rotating tables 33, 34 are rotated by 180 degrees around a vertical axis by a rotating mechanism (not shown). Furthermore, hooks 35 and 36 for hooking cords, which will be described later, are attached to these rotating tables 33 and 34. A cord supply mechanism 40 is installed above the main shaft 2, and this cord supply mechanism 40 is connected to a needle 4 supported by a guide 41 so as to be movable up and down.
It has 2. A hole 4 formed at the lower end of this needle 42
3, a cord 45 unwound from a reel 44 is guided and penetrated therethrough. Here, the cord 45 is made of a monocord (single filament) or a twisted record, and is made of textile, steel, or aramid fiber.Next, the operation of the first embodiment of the present invention will be explained.

When knitting a carcass ply cord using the above-described knitting device 1, first, the bead 21.22 with the filler 23.24 is seated on the bead 15.16, and then the cord 45 is unwound from the reel 44 and then Pass the starting end through the hole 43 of the needle 42. 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 passed through the bead 2.
1 to near the outside in the axial direction. The unwinding start end of the cord 45 is held near the receiver 15 by a stopper (not shown). Next, the movable block 3 is moved by the drive mechanism.
1 to the inside in the axial direction and hook 35 to the cord 4.
Hook 5.

Next, when the needle 42 is raised, the cord 45 is folded back at the position where it is caught on the hook 35.

Next, after the receiver 15 facing the movable block 31 is rotated around the bottle 13 by the rotation mechanism and retracted,
The movable block 31 and the hook 35 on which the cord 45 is hung are moved radially inward of the bead 21 and axially inward. The movement of the movable block 31 is stopped when the hook 35 reaches a position a predetermined distance axially inward from the axially inner surface of the bead 21. As a result of 2, the cord 4 hooked on the hook 35
The folded portion 46 (see FIG. 2) of No. 5 extends from along the radially inner surface of the bead 21 toward the axially inner side of the bead 21. Next, the main shaft 2 is moved to the first position by the reciprocating mechanism.
Move to the left in the figure until the block 12 reaches just below the needle 42.

Next, the needle 42 descends while passing outside the filler 42 in the axial direction, and the cord 45 is supplied near the outside of the bead 22 in the axial direction. By the above operation, the cord 45 extends along the outside of the filler 23, the core 7, and the filler 24, and has a generally toroidal shape as a whole.

Next, after moving the movable block 32 axially inward and hooking the cord 45 with the hook 36, the needle 42
to rise. Next, after the receiver 16 is retracted, the movable block 32 and the hook 36 move inward in the axial direction while keeping the cord 45 hooked thereon. As a result, the folded portion 46 of the cord 45 hooked on the hook 36 extends axially inward of the bead 22 along the radial inner surface of the bead 22. Next, the main shaft 2 moves to the right, and the needle 42 reaches between the core 7 and the filler 23. The above operations are the preparation stage.

Next, knitting is started. In this case, first, the needle 42 passes inside the filler 23 in the axial direction and descends to the vicinity of the inside in the axial direction of the bead 21, and the hook 3
5 into the folded part 46 of the cord 45 hooked on the cord 45. As a result, the cord 45 passing through the hole 43 of the needle 42 is supplied to the vicinity of the inside of the bead 21 in the axial direction, and by the six or more operations of penetrating into the folded portion 46, the cord 45 is supplied to the outside of the filler 24, the core It extends along the outside of filler 7 and the inside of filler 23, and has a generally toroidal shape as a whole. Next, the rotating table 33 and the hook 35 are rotated 180 degrees by the rotating mechanism.

As a result, the hook 35 separates from the folded portion 46, and hooks the cord 45 fed into the folded portion 46 by the needle 42. As a result, the folded portion 46 is attached to the cord 4 located inside the bead 21 in the axial direction.
Can be hooked up to 5. Next, after the needle 42 is raised, the movable block 31 and the hook 35 move outward in the axial direction while keeping the cord 45 hooked thereon. As a result,
The folded part 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 axially outer side of the bead 21. Move to the left, two dollars 42 is core 7
and the filler 24.

Next, the needle 42 passes inside the filler 24 in the axial direction, descends to the vicinity of the inside in the axial direction of the bead 22, and enters into the folded portion 46 of the cord 45 hooked on the hook 36. As a result, the hole 43 of the needle 42
The cord 45 passing through is supplied to the vicinity of the axially inner side of the bead 22 and enters into the folded portion 46. Through the above operations, 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 the cord 45 extends along the inside of the filler 23, the outside of the core 7, and the inside of the filler 24.
4 and hook 36 are rotated 180 degrees. As a result,
While the hook 36 is detached from the folded part 46, the cord 4 fed into the folded part 46 by the needle 42
Hook 5.

As a result, the folded portion 46 is hooked onto 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 3
6 moves outward in the axial direction while keeping the cord 45 hooked thereto. As a result, the folded portion 47 of the cord 45 hooked on the hook 36 extends axially outward of the bead 22 while along the radially inner surface of the bead 22 . 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 to the right until the needle 42 reaches directly above the block 11.

Next, the needle 42 is lowered while passing through the outer side of the filler 23 in the axial direction, and the cord 4 passed through the needle 42 is lowered.
5 is supplied to the vicinity of the outer side in the axial direction of the bead 21 and is caused to enter the folded portion 47. With 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 generally toroidal shape as a whole. Next, the rotating table 33 and the hook 35 are 1
After being rotated 80 degrees, the hook 35 separates from the folded portion 47 and hooks the cord 45 fed into the folded portion 47 by the needle 42 . As a result, the folded portion 47 is hooked onto the cord 45 located on the outside of the bidet 21 in the axial direction. Next, after the needle 42 is raised, the movable block 31 and the hook 35 are connected to the cord 45.
The folded portion 46 of the cord 45 hooked on the hook 35 moves axially inward while remaining hooked, so that the folded portion 46 of the cord 45 hooked on the hook 35 moves axially inward of the bead 21 along the radial inner surface of the bead 21 as described above. It will be extended.

Next, the main shaft 2 moves to the left, and the needle 42 reaches directly 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 outer side in the axial direction of the bead 22 and enters into the folded portion 47 . Through the above operations, 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 the rotating base 34 and the hook 36 are rotated 180 degrees. be done. As a result, the hook 36 separates from the folded portion 47 while the needle 4
2, the cord 45 fed into the folded part 47 is hooked. As a result, the folded portion 47 is hooked onto the cord 45 located on the outer side of the bead 22 in the axial direction. Next, after the needle 42 rises, the movable block 3
2. Since the hook 36 moves axially inward while hooking the cord 45, the folded portion 46 of the cord 45 hooked on the hook 36 moves along the radial inner surface of the bead 22 as described above. As the bead 22 extends inward in the axial direction, the main shaft 2 moves to the right, and the needle 42 reaches between the core 7 and the filler 23 .

The above is one cycle of the knitting operation, and this cycle is repeated continuously thereafter to knit the carcass ply cord 50 having a substantially toroidal shape as shown in FIG. At this time, as described above, the folded portion 46 of the cord 45 located on the axially outer side of the bead 21.22 is extended along the radially inner surface of the bead 21.22 to the cord 45 located on the axially inner side. At the same time as hooking the cord 45 located on the inside in the direction, the folded part 47 of the cord 45 located on the inside in the axial direction of the bead 21.22 is connected to the cord 45 located on the outside in the axial direction along the radial inside surface of the bead 21.22. The extended cord 45 located on the outside in the axial direction is hooked onto the cord 45 so that the cord 45 is locked to the beads 21 and 22, respectively. For this reason, the cords 4 located axially outside and inside the beads 21,22
Both folded ends of the beads 21 and 5 are located on the radially inner side of the beads 21 and 22. Here, air pockets are likely to occur at the folded ends of the cord 45 like the loops in the prior art, but the radially inner surfaces of the beads 21 and 22 where these folded ends are present do not allow external force to be applied during vulcanization. Since this is a location where air is easily removed, air can be reliably expelled during vulcanization, and air pockets can be prevented from forming. Moreover, in this first embodiment, the cord 45 located on the axially outer side of the bead 21.22 and the cord 45 located on the axially inner side of the bead 21.22 are hooked and connected on the radially inner side of the bead 21.22. , bead 2
There is no cord 45 on the radially outer surface side of 1.22.6 Therefore, the filler 23.24 is made into two beads, 22
When provided in the bead 21, these fillers 23 and 24 are provided in the bead 21.
．． It can be reliably pressed against the radially outer surface of 22. Furthermore, at this time, the fillers 23.24 are disposed between the cords 45 located on the axially outer side of the beads 21.22 and the cords 45 located on the axially inner side, so that the bead durability is improved. When the forming operation of the carcass ply cord 50 is completed, the starting end and the terminal end of the cord 45 are tied by hand or the like on the inner surface in the radial direction of the bead 21 (or bead 22).

FIG. 4.5 is a diagram showing a second embodiment of the present invention. In this embodiment, the main shaft 52 can pivot in the axial direction, that is, in the left and right directions in FIG. 4, but cannot rotate, and the block 53 fixed to the main shaft 52.
54 have a plurality of rollers 55.5 spaced apart from each other in the circumferential direction.
6 is rotatably supported, and a bead 21.22 with a filler 23.24 is rotatably supported on the roller 5556. And these beads 21.22
is intermittently rotated by a predetermined angle by a drive mechanism (not shown). In addition, in the case of this embodiment, the bead 21.2
In synchronization with the intermittent rotation of 2, the support 5,
The ring mechanism 6 and core 7 are also rotatable.

In addition, the blocks 53 and 54 each have the lower code 5.
The hooks 59 (only the left one is shown in FIG. 4) that supply 7.58 are arranged at approximately the same angular position. Note that the other configurations are the same as those of the first embodiment. When the carcass ply cord 50 as shown in FIG.
1, the lower cord 57 is hooked onto the cord 45 by the hook 59. Next, when the needle 42 is raised, the cord 45 is attached to the bead 21.
At this time, the lower cord 57 is caught on the folded portion 61. Next, the main shaft 52 is pivoted to the left in FIG. 4 to align the hook 59 with the lower position of the needle 42, and then the needle 42 is lowered to feed the cord 45 near the axially outer side of the bead 22. Next, the lower cord 58 is hooked onto the cord 45 using a hook 59 (not shown). Next, when the needle 42 is raised, the cord 4
5 is folded back on the outside in the axial direction of the bead 22,
At this time, the lower cord 58 is caught on the second folded portion 61. Next, move the main shaft 52 to the 41st! After rotating the hook 59 and the needle 42 to the right at 1 so that the line connecting the hook 59 and the needle 42 coincides with the axially inner space of the bead 21, the needle 42 is lowered to supply the cord 45 near the axially inner side of the bead 21. . Next, lower code 5 by hook 59
7 to the cord 45. Next, the needle 42
When the lower cord 57 is raised, the cord 45 is folded back on the inside of the bead 21 in the axial direction.
will be caught on this folded portion 62. next,
The main shaft 52 is rotated to the left and the hook 59 and needle 42 are
After aligning the line connecting them with the axially inner space of the bead 22, the needle 42 is lowered to supply the cord 45 near the axially inner side of the bead 22. Next, the lower cord 58 is hooked onto the cord 45 using a hook 59 (not shown). Next, when the needle 42 is raised, the cord 4
5 is folded back on the inside of the bead 22 in the axial direction,
At this time, the lower cord 58 will be caught on this folded portion 62. Next, the beads 21, 22 with the fillers 23, 24, the support 5, the link mechanism 6, and the core 7 are rotated by a predetermined angle and shifted by a predetermined pitch in the circumferential direction. Then, such operations are repeated alternately and continuously to form a carcass ply cord 50 as shown in FIG. 3.

Here, the lower cords 57, 58 are hooked alternately to the folded portions 61 of the cords located on the outside in the axial direction of the beads 21, 22 and the folded portions 62 of the cord 45 located on the inside in the axial direction, so that these beads It extends along the radial inner surface of 21 and 22 while bending in a substantially zigzag shape. Note that other functions are similar to those of the first embodiment.

In the above embodiment, the cord supply mechanism 40 is kept stationary and the main shaft 2 is moved in the axial direction, but in this invention, the main shaft 2 is kept stationary and the cord supply mechanism 40 is moved in the axial direction. Good too.

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

[Brief explanation of drawings]

FIG. 1 is a partially cutaway front view showing a first embodiment of the present invention;
FIG. 2 is a partial perspective view of the folded part and the vicinity of the bead, FIG. 3 is a perspective view of a part of the carcass ply cord, FIG. 4 is a partially cutaway front view showing a second embodiment of the present invention, and 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...Folded part 50...Cord for carcass ply 57.58...Lower cord 61.62...Folded part Patent applicant Brideston Co., Ltd. 21.22 Heat 45 Coat Figures 46, 47 Folded part 57 .58: Lower coat 61, 62 Turned part diagram carcass ply coat

Claims (2)

[Claims] (1) After folding the cord near the axially outer side of one bead, then folding it back near the axially outer side of the other bead, and then folding it back near the axially inner side of one bead,
A method of knitting a carcass ply cord having a substantially toroidal shape by repeatedly folding the bead near the axially inner side of the other bead while shifting the bead by a predetermined pitch in the circumferential direction of the bead. The folded portion of the cord located axially inward of the next adjacent bead is inserted through the radially inner surface side of the bead, and then the folded portion of the cord located axially inwardly of the bead The folded part of the cord located on the axially outer side of the next adjacent bead is inserted through the radially inner surface of the bead, and the cord is sequentially and alternately passed between the beads. How to knit carcass ply cord. (2) After folding the cord near the axially outer side of one bead, then folding it back near the axially outer side of the other bead, and then folding it back near the axially inner side of one bead,
A method of knitting a substantially toroidal carcass ply cord by repeatedly folding the bead near the axially inner side of the other bead while shifting the bead by a predetermined pitch in the circumferential direction of the bead. The folded portions of the cord located at the axially inner side of the bead and the folded portions of the cord located inside the bead in the axial direction are hooked alternately by the lower cord extending along the inner surface in the radial direction of the bead, so that the cord is passed between the beads. A method for knitting a carcass ply cord, which is characterized by: