JP2005342746A - Method and device for manufacturing annular concentric stranded bead wire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular concentric stranded bead wire which is rapid in the coiling operation, excellent in the coiling property, free from any disturbance of arrayed condition of a side wire 2, and excellent in forming property. <P>SOLUTION: The coiling movement in which a reel 21 with a side wire 2 coiled therearound is passed through a ring from the outer side of an annular core 1 and returned to the original position is repeated while the annular core 1 is rotated in the circumferential direction, and the side wire 2 to be drawn from the reel 21 is coiled up spirally around the annular core 1 to form one or a plurality of stranded wire layers. By repeating the cycle of the parallel movement, the orthogonal movement, the parallel movement and the orthogonal movement of the reel 21 with respect to the annular core surface, the motion that the reel 21 is separated from the annular core surface is minimized, and the coiling angle of the side wire 2 with respect to the annular core 1 is kept not exceeding 29°. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a bead cord embedded in a bead portion of a pneumatic tire, in particular, an annular concentric stranded bead cord provided with one or more strand layers formed by continuously winding a side wire around the annular core. The present invention relates to a manufacturing method and apparatus.

An annular concentric stranded bead cord is used for tires of various vehicles.
As shown in FIGS. 6 (a) and 6 (b), this annular concentric stranded bead cord is provided with a strand layer of the side wire 2 around the annular core 1, and the side wire 2 is connected to the annular core 1. By passing through the inside of the ring from the outside of the ring and again through the ring from the outside of the ring, the side wire 2 can be continuously wound around the annular core 1 and manufactured.

By the way, as a method of manufacturing an annular concentric stranded bead cord, the following method is conventionally disclosed.
First, in Patent Document 1, when a side wire is spirally wound around an annular core, a bead cord is used as a side wire that is preliminarily set to a diameter at least twice that of the annular core. A method of manufacturing is disclosed. When a bead cord manufactured by this method is used for a tire, grip force, turning force, and responsiveness associated with a feeling that the so-called waist is strong are improved.

  In Patent Document 2, the tip of the side wire is temporarily fixed to the annular core by a chuck mechanism, and the side wire is rotated around the core by rotating the bobbin inside and outside the core while rotating the core in the circumferential direction. The chuck mechanism is released from the core before the tip of the side wire that is wound spirally and temporarily fixed to the core overlaps the revolving position of the bobbin, avoiding interference between the chuck mechanism and the bobbin and continuing the revolving of the bobbin. A method is disclosed. In this method, S winding and Z winding can be alternately made into a multi-layer winding, and problems such as tangling and twisting of the side wire can be prevented, and the productivity and quality of the bead cord can be greatly improved. Yes.

  Further, Patent Document 3 discloses a reel in which the end of the side wire is entangled or temporarily fixed without being fixed to the annular core and can be freely rotated, and is wound by being bent to a smaller diameter than the annular core. Disclosed is a method of manufacturing a bead cord by combining the plane movement of the wire, the vertical movement of the annular core and the rotation of the annular core, and tangling the side wire to the annular core by the bending stress of the steel wire so that no twisting stress is generated. Has been.

Japanese Patent No. 3499261 JP 2001-47169 A JP 2004-98640 A

In the bead cord, the stability of the shape is the most important quality, but the methods described in the above patent documents have the following problems.
In the case of the method disclosed in Patent Document 1, it is difficult to automate because the pre-cursed side wire is wound around a radius twice or more than the radius of the core in order to strengthen the tire. There are many factors that increase costs. Also, when the annular diameter of the side wire that winds around the core is large, it is difficult to wind manually, and because it is pre-cursed, resistance increases when pulling out, causing trouble when winding become. Also, after winding the side wire around the reel, when winding around the annular core, the winding will loosen unless a certain level of tension is applied at all times, and the core will be easily distorted even with a little tension. Adversely affects.

Next, in the case of the method disclosed in Patent Document 2, the core is temporarily fixed by the chuck mechanism, and the bobbin is revolved in and out of the core while rotating the core in the circumferential direction. There are many useless movements, and the device itself becomes heavy.
In the case of the method disclosed in Patent Document 2, as shown in the conceptual diagram of FIG. 9, the bobbin 3 is revolved inside and outside the annular core 1, and therefore, as shown in FIG. From the state in which the winding angle β ′ parallel to the annular core 1 is 0 °, the winding angle β ′ in which the bobbin 3 is separated from the annular core 1 is in a state of about 50 ° as shown in FIG. Until the winding angle β ′ is changed, the side wire 2 is wound around the annular core 1. The twist angle β of the bead cord generally used for tires on the market is 3.5 to 5.5 ° for a 1 + m twist structure for a motorcycle, and 7 ° for a 1 + m + n twist structure for a passenger car / light truck. Therefore, when the difference between the winding angle β ′ and the twist angle β becomes large as described above, there is a problem that the arrangement state of the side wires 2 to be continuously wound is easily disturbed and the code formability is not good.
Furthermore, in the method of Patent Document 2 in which the bobbin 3 is revolved inside and outside the core 1, the bobbin 3 moves along a circular orbit, so that the movement is redundant and it takes a long time to complete the winding. Further, since the side wire 2 is wound so as to apply a constant tension, there is a problem that the core 1 is easily pulled meandering in the circumferential direction and the winding property is poor.

  Next, in the case of the method disclosed in Patent Document 3, since the core is placed horizontally and moves in a complicated manner, as in the case of Patent Document 2, an element having a large winding angle is provided, and the winding property is improved. It becomes unstable. Further, the horizontal movement of the reel is also an operation of returning once and it takes twice as much time, so that it takes twice as long to finish. Moreover, unless the movement of the core which becomes a pillar at the time of winding is limited as much as possible, the winding property tends to be unstable. In particular, since it is placed in the direction of gravity, moved up and down in the direction of gravity, and the reel around which the side wire is wound is operated intermittently, the winding property is poor.

  Accordingly, the present invention is intended to provide a method and an apparatus for producing an annular concentric stranded bead cord that has a fast winding operation, good winding properties, and good formability without disturbing the arrangement of the side wire. is there.

  In order to solve the above-mentioned problems, the present invention is configured to wind a reel wound with a side wire while returning the annular core from the outer side of the ring of the annular core to the original position while rotating the annular core in the circumferential direction. In the method of manufacturing an annular concentric stranded bead cord in which one or more strand layers are formed by continuously winding the side wire pulled out from the reel spirally around the annular core, the winding angle of the side wire to the annular core is The reel is wound and moved so as not to exceed 29 degrees.

  In this way, by winding and moving the reel so that the winding angle of the side wire to the annular core does not exceed 29 degrees, the winding property of the side wire is good and the side wire is not disturbed. Sex was obtained.

In order to wind and move the reel so that the winding angle of the side wire with respect to the annular core does not exceed 29 degrees, the reel core is moved in parallel, moved perpendicularly, moved parallel, moved perpendicularly to the annular core surface. By repeating the cycle to minimize the movement of the reel away from the annular core surface, the wrap angle can be reduced.
That is, the movement trajectory of the reel around which the side wire is wound draws an elongated box-shaped trajectory centering on the annular core surface, so that the reel does not greatly leave the annular core surface, and the winding angle of the side wire is reduced. Variation can be minimized.

  Further, as another method for preventing the reel from being largely separated from the annular core surface, the series of movements may be configured such that the winding movement locus of the reel draws an elliptical orbit by an inner peripheral tooth or the like. .

  It is preferable that the terminal at the start of winding the side wire is temporarily fixed with an unvulcanized rubber sheet so that the side wire drawn from the reel is spirally wound around the annular core. Since unvulcanized rubber is the same quality as rubber for tires, it is not necessary to remove it in a subsequent process.

As described above, when the movement of the reel around which the side wire is wound is made into an elongated box type or elliptical orbit, the length of the side wire changes from time to time between the winding end point of the side wire and the unwinding start point. To do.
For this reason, since the side wire wound around the reel may be loosened, a tension applying device may be added to the reel supply section, but the loosening is allowed without adding a tension that adversely affects the winding property. In order to prevent the side wire from swelling and to wind the side wire in a spiral shape on the annular core, in order to effectively disperse the rigidity of the side wire, the coil diameter of the side wire before winding on the reel is set in advance. It is preferable to adjust so that either of the following formulas is satisfied.
0.90D _R ≦ D _SO ≦ 2.05D _R
Or 0.55D _C ≦ D _SO ≦ 1.25D _C
In the formula, D _R is the outer diameter of the reel, D _SO is the adjusted coil diameter of the side wire, and D _C is the center diameter of the annular core.

  Furthermore, in order to allow the side wire to loosen and prevent the side wire from swelling when spirally wound, a cylindrical outer peripheral wall having a diameter slightly larger than the reel outer diameter and corresponding to the reel inner width is provided. It is preferable that the reel is rotatably accommodated in a tension-free state in the cassette, and the side wire is drawn out from a drawing hole provided in the outer peripheral wall of the cassette.

  In the present invention, it is important that the reel supply unit can slide at least a distance that passes through the annular core in the unwinding direction of the side wire, that is, the direction perpendicular to the annular core surface. The spiral winding is possible and the variation in the winding angle is suppressed. If the winding angle exceeds a specified upper limit, that is, 29 degrees, the arrangement of the side lines tends to be disturbed. Because the reel of the supply section moves specially in this way, it tends to sag especially when the side wire moves in a direction approaching the annular core, but the side wire does not sag due to the rigidity of the side wire and the spring back. Since it is pushed in the reel direction and can be absorbed in the reel, the tension can be reduced by using a cartridge type in which the side wire has a coil diameter adjusted in advance and the reel is accommodated in the cassette without using any drive motor or the like. But I am trying not to interfere.

  A manufacturing apparatus that enables a method of manufacturing a concentric stranded bead cord according to the present invention includes a driving unit that rotates an annular core in a circumferential direction, and a supply of a side wire that supplies a side wire wound on a reel to a winding portion of the annular core. And the reel of the supply section are moved in parallel to the annular core surface from the outside to the inside of the annular core, passing through the ring of the annular core and slightly passing through the annular core on the opposite surface of the annular core. Move it at a right angle (half-turn so far), move it from the inside of the annular core to the outside in parallel with the opposite surface of the annular core, and move it back from the opposite surface of the annular core to the starting point of the original surface. And a slide unit that completes one roll.

  The driving unit includes two pinch rollers that rotate the annular core, and a clamp unit that guides the annular core loosely above the pinch roller. As a result, it is possible to prevent lateral deflection of the annular core, maintain stable circumferential rotation, and obtain high winding properties.

  The supply part of the side wire accommodates the reel rotatably in a tension-free state in a cassette having a circular outer peripheral wall corresponding to the inner width of the reel and having a diameter slightly larger than the outer diameter of the reel. It is preferable to form a cartridge by drawing out the side wire from a drawing hole provided in the wall.

  As described above, according to the present invention, it is possible to manufacture an annular concentric stranded bead cord that has a fast winding operation, good winding properties, and good formability without disturbing the arrangement of the side wire.

An example of the manufacturing apparatus which enables the manufacturing method of the concentric twist bead cord of this invention is demonstrated based on FIGS.
In the manufacturing apparatus of the present invention, a driving unit 10 composed of two pinch rollers 11a and 11b connected to a drive motor to rotate the annular core 1 in the circumferential direction, and a side wire 2 wound around a reel 21 are connected to the annular core. The supply portion 20 of the side wire 2 supplied to the winding portion of 1 is moved in parallel with the annular core surface from the outside to the inside of the annular core 1 and passes through the ring of the annular core to the opposite surface of the annular core. Move the ring core at a right angle by the distance it passes through (half turn so far), move it from the inside of the ring core to the outside in parallel with the opposite surface of the ring core, and start position of the original surface from the opposite surface of the ring core And a slide unit 30 that completes one turn by moving it at a right angle.

  The slide unit 30 includes a moving base 31 that reciprocates in parallel along a rail 36 disposed in parallel with the annular core surface by a crank mechanism 34 connected to a drive motor 37, and an annular core provided on the moving base 31. It consists of a pair of front and rear cassette stands 32 that sandwich the surface at close positions.

  On the upper part of the pair of cassette stands 32, the supply unit 20 for the side wire 2 is installed. The supply unit 20 includes a reel 21 around which the side wire 2 is wound, and a cassette 22 having a cylindrical outer peripheral wall having a diameter slightly larger than the outer diameter of the reel 21 and corresponding to at least the inner width of the reel. The reel 21 is accommodated in the cassette 22 so as to be rotatable in a tension-free state so as to cover the entire winding surface of the side wire 2 and is formed into a so-called cartridge. An unwinding hole 22 a is formed in the outer peripheral wall of the cassette 22, and the side wire 2 is drawn from the unwinding hole 22 a toward the winding point of the annular core 1. The side wire 2 is wound around a reel 21 with a coil diameter adjusted in advance, and is set in a cassette 22 of the supply unit 20.

  The guide rod 33 to which the cassette 22 can be removably attached and the cassette 22 attached to one guide rod 33 are moved to the other guide rod 33 at opposite positions on the upper part of the pair of cassette stands 32. A change and change mechanism is installed. As shown in FIGS. 3 and 4, the transfer mechanism is composed of a rod 38a that is moved in and out by the air cylinder 35, and an extrusion plate 38b that pushes the central portion of the cassette 22 provided at the tip of the rod 38a. By extending the rod 38 a of the air cylinder 35 and pushing the central portion of the cassette 22 by the push-out plate 38 b, the cassette 22 mounted on one guide rod 33 can be transferred to the other guide rod 33.

  The driving unit 10 includes two pinch rollers 11a and 11b that rotate the annular core 1, and a clamp unit 4 that guides the annular core 1 loosely above the pinch rollers 11a and 11b. The clamp unit 4 is composed of two rollers 4a and 4b arranged in a U-shape, prevents lateral swing of the annular core 1, maintains stable circumferential rotation, and additionally winds the side wire 2 By positioning the end point, a high winding property is obtained. In this example, the annular core 1 is rotated vertically in a circumferential direction while suppressing lateral vibration.

  The start of winding of the side wire 2 is ensured, and the front end of the side wire 2 is temporarily fixed to the annular core 1 by an unvulcanized rubber sheet or adhesive tape by human means. Since the unvulcanized rubber sheet is the same quality as the rubber for tires, there is no need to remove it later. When the tip of the side wire 2 is temporarily fixed to the annular core 1 in this way and then the annular core 1 is rotated in the circumferential direction, the side wire 2 is positioned on the right side in the case of S winding with respect to the annular core surface. The reels move in parallel from the outside to the inside of the annular core at intervals such that the reel does not hit the annular core, and the winding of the side wire 2 around the annular core 1 starts. The cassette 22 is moved to a place where the reel 21 does not hit the annular core, and the reel 21 is moved at right angles to the annular core surface by the air cylinder 35 provided on the upper part of the cassette stand 32, so that the other cassette stand 32 When the cassette 22 is transferred to the guide rod 33, the winding is performed half a turn. Thereafter, the left side of the annular core surface is moved in parallel from the inner side to the outer side of the annular core 1 on the opposite side to the outward path, and the reel 21 in the cassette 22 is returned to the start position. In order to return the reel 21 to the starting position, the air cylinder 35 again moves the reel 21 together with the cassette 22 at a right angle with respect to the annular core surface to complete one winding. The slide unit 30 at the lower part of the apparatus moves the reel 21 in parallel with the annular core surface.

  The series of movements of the reel 21 is an elongated box type movement, and such irregular movement is continuously performed by synchronizing the drive motor 37 and the air cylinder 35. Further, in order to cope with the loosening of the wire due to the irregular rotation of the side wire 2 with respect to the regular rotation only in the circumferential direction of the annular core 1, the loosening is amplified by adjusting the coil diameter to the side wire 2 in advance. The reel 21 is accommodated in the cassette 22 so as not to be detached from the reel 21 and is made into a cartridge so that the wire is sealed.

As shown in FIG. 7, the reel 21 around which the side wire 2 is wound is reciprocated by the slide unit 30. The movement locus of the reel 21 is shown in a conceptual diagram as shown in FIG.
That is, the reel 21 shown in FIG. 8B is located in the ring of the annular core 1 from the start position shown in FIG. Move to a position that passes through. 8B is moved to the opposite surface of the annular core 1 shown in FIG. 8C, and the opposite surface of the annular core 1 is shown in FIG. 8C inside the annular core 1. After moving from the position to the outer position shown in FIG. 8D, the cycle of returning from the opposite surface of the annular core 1 to the starting point position of the original surface (position (a) in FIG. 8) is repeated. As described above, in the present invention, the reel 21 is moved as shown in FIGS. 8 (a) → (b) → (c) → (d) → (a), and the side wire 2 is moved around the annular core 1. 8 (a) → (b), (c) → (d) move with respect to the core surface of the annular core 1, (b) → (c), (d) → (A) moves at right angles to the core surface.

  In addition, although the above embodiment is the content which winds the side wire 2 to the S direction in the cyclic | annular core 1, it can also laminate | stack with 2 layers and 3 layers, and it winds in the Z direction by 2 layer lamination | stacking. In this case, the direction of the box type movement is the opposite direction, (d) → (c) → (b) → (a) → (d) in FIG. This can be done simply by changing the shape roller. Thereafter, switching to the implementation of 3 layers and 4 layers is the same as in the case of 1 layer and 2 layers.

  Using the manufacturing method and apparatus described above, single-layer and double-layer bead cords were actually produced under various conditions, and the meandering property and moldability of the product were evaluated. It has been found that the wrap angle β '° has the most influence on both characteristics, and then the tension of the side wire and the pre-adjusted coil diameter of the side wire. Table 1 shows the results.

In addition, the meandering property and the moldability of the evaluation items in Table 1 were evaluated by the following methods.
(1) Meandering property The cord was placed on a flat surface such as a surface plate, and the maximum gap at the place where the cord was lifted from the surface plate was measured with a scale and evaluated as follows. The number of samples n is 20.
A: There are 11 or more gaps of 0.5 mm or less, and all other gaps are 1.0 mm or less.
A: The gap of 0.5 mm or less is less than 11, and the gap of 1.0 mm or less is 11 or more.
Δ: Less than 11 gaps of 1.0 mm or less, and 11 or more gaps of 1.5 mm or less.
X: The gap of 1.5 mm or less is less than 11.
(2) Formability The alignment property of the side wire on the surface of the annular core or the single layer winding intermediate wire was visually evaluated. The number of samples n is 20.
(Double-circle): There is no disorder of arrangement | sequence with 20 lines.
◯: There are 18 or more without any disorder of the arrangement.
(Triangle | delta): The thing with no arrangement | sequence disorder is 10 or more and less than 18.
X: There are less than 10 that do not have disorder of arrangement | sequence.

It is a front view which shows an example of the manufacturing apparatus of the cyclic | annular concentric twist bead cord concerning this invention. It is a top view same as the above. It is a side view of a slide unit portion. It is a fragmentary sectional view which shows the upper part of a cassette stand. It is a side view of a clamp unit. (A) is a whole figure of a cyclic | annular concentric twist bead cord, (b) is a perspective view which shows the part of a cyclic | annular concentric twist bead cord. It is the conceptual diagram which looked at the movement state of the reel at the time of manufacturing the cyclic | annular concentric twist bead cord of this invention from the front side. (A)-(d) is the conceptual diagram which looked at the movement state of the reel at the time of manufacturing the cyclic | annular concentric twist bead cord of this invention planarly. It is the conceptual diagram which looked at the movement state of the bobbin at the time of manufacturing the conventional cyclic | annular concentric twist bead cord from the front side. (A)-(b) is the conceptual diagram which looked at the moving state of the bobbin at the time of manufacturing the conventional cyclic | annular concentric twist bead cord planarly.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ring core 2 Side wire 3 Reel 4 Clamp unit 10 Driving roll unit 11a, 11b Pinch roll 11c Drive motor 13 Pressing roller 14 Swing lever 20 Wire supply part 21 Reel 22 Cassette 22a Unwinding hole 30 Slide unit 31 Moving stand 32 Cassette Stand 33 Guide rod 34 Crank mechanism 35 Air cylinder 36 Rail 37 Drive motor 38a Rod 38b Extrusion plate

Claims (9)

  While rotating the annular core in the circumferential direction, repeat the winding movement to return the reel wound with the side wire from the outside of the ring of the annular core to the original position through the ring, and remove the side wire pulled out from the reel to the annular core. In a method of manufacturing an annular concentric stranded bead cord in which one or more strand layers are formed by continuously winding in a spiral around the periphery of the wire, the reel is wound and moved so that the winding angle of the side wire to the annular core does not exceed 29 degrees A method for producing an annular concentric stranded bead cord, characterized in that:   2. The method of manufacturing an annular concentric stranded bead cord according to claim 1, wherein the winding movement of the reel repeats the cycle of parallel movement, right-angle movement, parallel movement, and right-angle movement sequentially with respect to the annular core surface.   2. The method of manufacturing an annular concentric stranded bead cord according to claim 1, wherein a trajectory of the winding movement of the reel draws an elliptical trajectory.   The winding start terminal of the side wire is temporarily fixed with an unvulcanized rubber sheet, and the side wire drawn out from the reel is spirally wound around the annular core. The manufacturing method of the cyclic | annular concentric twist bead cord as described in a term. The annular concentricity according to any one of claims 1 to 4, wherein a coil diameter of the side wire wound around the reel is adjusted in advance so as to satisfy any of the following formulas: A manufacturing method of a twist bead cord.
0.90D _R ≦ D _SO ≦ 2.05D _R
Or 0.55D _C ≦ D _SO ≦ 1.25D _C
In the formula, D _R is the outer diameter of the reel, D _SO is the adjusted coil diameter of the side wire, and D _C is the center diameter of the annular core.   A driving unit that rotates the annular core in the circumferential direction, a supply part of the side wire that feeds the side wire wound around the reel to the winding part of the annular core, and the reel of the supply part are arranged in parallel with the annular core surface. Move from the outside of the core to the inside, move perpendicularly to the opposite surface of the annular core through the ring of the annular core, and move from the inside of the annular core to the outside in parallel with the opposite surface of the annular core. An apparatus for manufacturing an annular concentric stranded bead cord, comprising a slide unit that is moved from an opposite surface to a starting point position of the original surface at a right angle and returned.   7. The ring according to claim 6, wherein the supply portion of the side wire is provided with two reel delivery mechanisms that face each other at a minimum distance through which the reel passes through the ring core on the opposite surface of the ring core. Concentric twist bead cord manufacturing equipment.   The annular concentric stranded bead cord according to claim 6 or 7, wherein the driving unit includes two pinch rollers for rotating the annular core, and a clamp unit provided at an upper position of the pinch roller for guiding the annular core loosely. manufacturing device.   The supply part of the side wire accommodates the reel rotatably in a tension-free state in a cassette having a cylindrical outer peripheral wall corresponding to the inner width of the reel and having a diameter slightly larger than the outer diameter of the reel. The apparatus for producing an annular concentric stranded bead cord according to any one of claims 6 to 8, wherein a side wire is drawn out from a drawing hole provided in the wall.

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