JPH0584734B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) This invention deals with belt lifting when running on radial tires (the belt shoulder deforms and lifts due to centrifugal force, causing peeling damage between the belt's metal cord and rubber). This invention relates to a method and apparatus for forming a belt reinforcing layer used to prevent this phenomenon.

(Prior Art and Problems to be Solved by the Invention) Conventionally, in the manufacturing method of radial tires, the method for forming a belt reinforcing layer disclosed in Japanese Patent Publication No. 61-51979, for example, involves forming a cylindrical primary formed tire carcass, In a radial tire molding method, a predetermined number of belts are deformed into a toroidal shape on a radial tire molding machine, and a predetermined number of belts are attached to the outer surface of the radial tire by pressure bonding. After being laminated on the belt ring, one or more synthetic fiber cords are continuously spirally arranged in the circumferential direction at equal pitches of 5 to 15 mm over a range of 70% or more of the belt width on the outer peripheral surface of the belt. After wrapping a tread on top of the belt, the primary formed tire carcass is deformed into a toroidal shape to the extent that the outer surface of the tire carcass is pressed against almost the entire inner peripheral surface of the belt, and a green tire is formed. It was designed to do so.

Although the above method is effective in preventing the undesirable equatorial diameter expansion of the green tire due to the shaping internal pressure during vulcanization, the cord winding pitch is 5 to 5.
Because it is set as wide as 15mm, it is weak in terms of belt reinforcement when running on tires. That is, the reinforcing effect against belt damage caused by lifting during tire running is insufficient. Furthermore, in the above method, there is no consideration given to the stretching of the belt during running, and the belt is formed using a belt drum whose surface has a flat cross-sectional shape passing through the axis. However, the belt circumference of a vulcanized tire is shorter at the belt shoulder and longer at the belt center due to the shaping (expansion) process during vulcanization. The problem is that the heat shrinkage force is large at the belt center and small at the belt shoulder, and the heat shrinkage force is low at the belt shoulder, reducing the so-called hoop effect and causing damage during lifting during running.

The present invention has been made in order to eliminate such conventional drawbacks, and it provides one or more organic cords that can reliably prevent the belt shoulder from being damaged by lifting when running on tires. The present invention provides a novel method and apparatus for forming a belt reinforcing layer by spirally winding the belt.

(Means for Solving the Problems) A first aspect of the present invention is to provide a method for manufacturing a radial tire by deforming a cylindrical tire carcass into a toroidal shape and press-fitting a belt and treads to the outer surface of the cylindrical tire carcass. After stacking a predetermined number of belts on a ring or belt drum, one or more rubber-coated organic fiber cords are placed between the shoulders on the outer circumferential surface of the belt. The belt is continuously wound spirally in the circumferential direction of the belt with a pitch of 0.5 to 5.0 mm and a pitch of 0.5 to 15.0 mm at the center of the belt, while the winding tension is maximum at the shoulder of the belt and the belt It is designed to be the minimum at the center.

The second gist of the present invention is a method of manufacturing a radial tire by deforming a cylindrical tire carcass into a toroidal shape and compressing a belt and treads onto the outer surface of the carcass, in which a predetermined number of tires are formed on a belt ring or a belt drum. After the belts are laminated, a wide rubber sheet is wrapped around the outer circumferential surface of the belt, and one or more organic fiber cords without rubber coating are placed on the belt at a pitch of 0.5 to 5.0 mm at the belt shoulders. And, while the belt is continuously wound spirally in the circumferential direction of the belt at a pitch of 0.5 to 15.0 mm at the center of the belt, the winding tension is maximum at the shoulder of the belt and minimum at the center of the belt. Then, a wide rubber sheet is wrapped around it.

The third aspect of the present invention is that when manufacturing a radial tire by deforming a cylindrical tire carcass into a toroidal shape and compressing a belt and treads onto the outer surface of the tire carcass, one or more organic A device for forming a belt reinforcing layer by winding a fiber cord in a continuous spiral, which includes a pair of feeding means for feeding out the cord to be wound toward the belt, and a pair of feeding means for feeding out the cord to be wound toward the belt, and a device for moving each of these feeding means close to each other in the axial direction of the tire. The cord has a traverse means for traversing between a closed state and a separated state, a traverse control means for controlling the traverse of each of the above-mentioned feeding means, and a tension control means for controlling the winding tension of the cord.

Further, the cords may be wound symmetrically from the center of the belt toward the shoulders.

(Example) Figures 1A to 1C show examples of organic fiber cords constituting the belt reinforcing layer of the present invention, and Figure 1A shows a nylon cord covered with a rubber coating 2.
66, organic fiber spun yarn, monofilament yarn, etc. made of nylon 6, polyester, Kevlar, etc.
One long cord 1 is composed of a large number of single or twisted multifilament yarns,
The coating rubber is the same as that used for conventional belt reinforcement layers (nylon bands with joints in the belt width direction), such as natural rubber-based or natural rubber/SBR.
It is a rubber compound mainly composed of a blend of and has good adhesion to Code 1.

FIG. 1B shows a belt-shaped body in which a plurality of cords 1 are aligned and tied together and integrated by a rubber coating 2. This strip can be easily formed in an extruder or calender ball. When creating a belt-like cord like this,
When wrapping the tires, it is desirable from the point of view of tire uniformity that the number of tires is such that the angle to the circumferential direction does not exceed 0 degrees by too much.

FIG. 1C shows the cord 1 itself, which is not covered with a rubber coating.

The diameter of the cord 1 is determined by the strength required to prevent lifting, for example, 0.5
~1.5mm, and the thickness of the rubber coating depends on the required durability, for example 0.05~0.8
mm.

In addition, for one or more (band-shaped) organic fiber cords with or without rubber coating, the pitch l between cords 1 should be 0.5 to 5.0 mm at the belt shoulders, and 0.5 mm at the center of the belt. ~ 15.0 mm, the belt is continuously wound spirally around at least 70% of the outer peripheral surface of the belt approximately parallel to the tire equator,
Form a belt reinforcing layer.

Figure 2 shows that the rubber-coated cord 1 is continuously spiraled in the circumferential direction only on both shoulders BS of the belt on the outer peripheral surface of a two-layered belt 4 wound around a belt drum or belt ring 5. It shows a state in which the belt is wound around to form a belt reinforcing layer as a so-called edge band. The winding pitch of cord 1 needs to be 0.5 to 5.0 mm as described above to prevent lifting of the belt shoulder. The above spiral winding is performed one or more times as necessary.

In FIG. 3, a rubber-coated cord 1 is continuously wound spirally in the circumferential direction over the entire width of the belt around the outer peripheral surface of a two-layered belt 4 wound around a belt drum or belt ring 5. This shows a state in which a belt reinforcing layer is formed as a so-called full band. The winding pitch of code 1 is
In order to prevent belt shoulder lifting, it is necessary to set a pitch of 0.5 to 5.0 mm at the belt shoulder BS, and a pitch of 0.5 to 15.0 mm at the belt center BC. The above spiral winding is performed one or more times as necessary.

Figure 4 shows a single rubber-coated organic fiber cord 1 layered on both shoulder parts BS of the belt reinforcing layer of the full band shown in Figure 2 and continuous in the circumferential direction at a pitch of 0.5 to 5.0 mm. An example is shown in which a belt reinforcing layer is formed as a combination of a full band and an edge band by winding them in a spiral shape. The number of belt reinforcing layers, number of cords, cord thickness, pitch, etc. may be changed as necessary.

Furthermore, FIG. 5 shows that a thin rubber sheet 51 is wrapped around the outer circumferential surface of a two-layered belt 4 wound on a belt drum or belt ring 5, and an organic fiber cord 1 without rubber coating is placed on top of the thin rubber sheet 51 in the circumferential direction. Continuously spirally wrap the belt shoulder portions with a pitch of 0.5 to 5.0 mm and the belt center portion with a pitch of 0.5 to 15.0 mm, and further wrap the second rubber sheet 52 on top of the belt to form a rubber sheet 51. It has a structure in which a spirally wound cord 1 is sandwiched between cords 1 and 52. In this case, it is preferable to use a material for the rubber sheets 51 and 52 that has good adhesion to the cord 1, similar to the material for the rubber coating. In addition, in the case of this embodiment, after wrapping the second rubber sheet 52,
Before winding the tread, the rubber sheet 52, the cord 1, and the rubber sheet 51 are pressed together with a pressure roller so that the rubber is press-fitted between the cords 1.

The winding tension of the cord 1 may be set uniformly in the width direction of the belt 4, but the tension of the cord 1 after tire vulcanization may be set uniformly over the entire width of the belt, or The cord is wound so that the constant load elongation rate is small at the shoulders of the belt 4 and large at the center of the belt 4, and the tension of the cord is maximum at the shoulders and minimum at the center of the belt. be able to.

The winding tension can be selected appropriately depending on the size and structure of the tire, but for example, if cord 1 is made of nylon
When using 1260d/2 of 66, it is sufficient to wrap cord 1 so that the weight is at least 20g at the center of the belt, gradually increases toward the belt shoulder, and reaches a maximum of 40g at the belt shoulder. In the tire after vulcanization, the cord tension of the belt reinforcing layer is uniformly 50 g over the entire width of the belt.

An example of the entire method for manufacturing a radial tire including the method for forming a belt reinforcing layer of the present invention is as follows. In FIG. 12, a plurality of belts 4 are wound around a belt forming drum 5 whose diameter can be expanded or contracted in an expanded state, and then a single rubber-coated organic fiber cord is wrapped around the belt forming drum 5, and then a single rubber-coated organic fiber cord is wrapped around the belt forming drum 5. 0.5 to 5.0 mm at the shoulder and 0.5 at the center of the belt
15.0 mm in parallel to the circumferential direction in a spiral manner, and at this time, the winding tension is maximum at the shoulder of the belt and minimum at the center of the belt. wear. In this case, two rubber-coated organic fiber cords may be wound symmetrically from the center of the belt toward the shoulders.

Once the belt reinforcing layer as shown in FIG. 3 is formed in this way, a tread 56 is further wound on top of it to form a band, and then pressure is applied from above the tread using a stitcher roller (not shown). Belt 4, belt reinforcement layer 1 and tread 5
Integrate with 6. A conveyor ring (not shown) that has been waiting between the tire building drum 55 and the belt drum moves onto the belt drum, reduces its diameter, grips the outer circumferential surface of the integrated assembly, and the belt drum Once reduced in diameter, the assembly is transferred onto a tire building drum 56.

Next, the cylindrical tire carcass 50 on the tire forming drum 56 is deformed into a toroidal shape, and both of its bead holding parts are synchronously moved inward in the axial direction, so that the expanded outer circumferential surface of the above-mentioned assembly is in standby. It is pressed against the entire width of the inner surface of the belt. When the conveyor ring returns to the standby position, a stitcher roller (not shown) presses the tread to fix the assembly to the tire carcass, completing the green tire.

6 to 8 show an apparatus for forming a belt reinforcing layer, in which the winding device 7 includes a feeding means 73 for feeding out the cord 1 to be wound toward the belt drum 6 side, and a feeding means 73 for traversing the belt in the width direction of the belt. The basic structure is composed of a traverse means and a traverse control means for controlling the traverse of the feeding means, and a tension control means for controlling the winding tension of the cord can be added to this basic structure. This traverse means consists of a pair of guide shafts 72 whose both ends are supported by a frame 70 and a screw shaft 71 which is rotationally driven by a motor to be described later. The traverse of the means 73 is guided.

The moving frame 73a of the feeding means 73 is screwed onto the screw shaft 71, is penetrated by the guide shaft 72, and is supported in a traversable manner.
An arm 77 is provided on the upper part of the guide pulley 75, and a plurality of guide pulleys 75 are rotatably held by this arm 77. This arm 77 may be fixed integrally to the moving frame 73a, but as shown in the figure, it is supported in the sliding direction toward the belt drum by a guide rail 73c provided at the upper part of the moving frame 73a, and is supported by a spring 85.
A guide roller 78 rotatably supported at the tip of a support rod 78a attached to an arm 77 is always urged toward the belt drum 6 side by the frame 7.
0 is pressed against a tracing plate 79 provided on the top of the
Thereby, the feeding means 73 may be guided to move in the width direction of the belt while maintaining a desired distance from the surface of the belt drum 6.

The traverse control means consists of a servo motor 8 with an encoder that rotationally drives the screw shaft 71, its drive unit 93, and a rotation pulse counter 91 for the belt drum 6, and is used to control the winding start position and end position, the winding pitch, and the like. The moving distance of the feeding means to the point where the winding tension is changed is controlled, and the winding pitch is controlled by synchronizing the winding pitch with the (constant) rotational speed of the belt drum. The servo motor 8 may be a DC motor, and the drive unit 93 is, for example, a "(Positionpack 1D) digital servo positioning device" manufactured by Yaskawa Electric. It goes without saying that when an AC motor is used as the motor, the drive unit 93 is unnecessary.

The tension control means necessary for winding the cord with a predetermined tension is the brake pulley 7 rotatably supported by the moving frame 73a of the feeding means 73.
4, a presser roller 74a urged toward the guide pulley by a spring 86, a powder brake 74c coaxially attached to the brake pulley 74, and a rotational resistance corresponding to a predetermined winding tension generated in the powder brake 74c. and a power supply unit 92 that applies a predetermined tension to the cord 1. This power supply unit 92 is, for example, "DMP type power supply box DMP" manufactured by Shinko Electric.
Therefore, code 1 is applied to this brake pulley 74.
By passing the cord 1 over the belt, the cord 1 can be sent out and wound around the belt forming drum 6 through the guide pulley 75 with a predetermined tension.

It goes without saying that the above power supply unit is not required when using a mechanical brake such as an air brake.

On the other hand, the winding start position, winding end position, single or multiple winding pitch setting values, single or multiple winding tension setting values, winding pitch conversion position, winding tension conversion position, etc. are set. A control unit 90, which is a sequencer or a relay, is connected to the setting board 9, and a counter 91 is connected to the encoder 61 provided on the forming drum 6.
The rotation speed of the forming drum 6 is inputted to the control unit 90 through the control unit 90.

Further, the power supply unit 92 is connected to the control unit 90, and as described above, the power supply unit 92 causes the brake pulley 74 to apply a predetermined tension to the cord 1. Further, a drive unit 93 is connected to the control unit 90, and as described above, the output from this drive unit 93 drives the servo motor 8 to rotate the screw shaft 71, thereby moving the feeding means 73 in a predetermined direction and position. I am trying to traverse at a speed of .

The lower end of the frame 70 of the winding device 7 is placed on a guide rail 70a, and the device 7 slides along this guide rail 70a, making it possible to finely adjust the distance between the tip of the arm 77 and the belt drum 6. That's what I do. Further, as shown in FIG. 6, the cord feeding device 7a includes a guide pulley 1e, a feeding roller 1f, a presser roller and
1l, a pair of pull rollers 1c in the center, a drive pulley 1m in the lower part, and each of the above pulleys 1f, 1
The rotational force from the drive motor 1h is transmitted through a belt 1k that is stretched over a length of 1 m.

The cord 1 is wound up with a liner 1b, or a winding roll 1 in which a cord coated with an anti-adhesion agent on the rubber surface is wound up without a liner.
d is rotatably mounted on the let-off stand, and the liner 1b is pulled out by the pull roll 1c, and the cord 1 is pulled out from the guide pulley 1.
e, the sheet is fed out through the feed roller 1f and the presser roller 1l, and is drawn out to the winding device side and guided to the guide pulley 75a of the feeding means 73 provided on the frame 70.

Rather than applying a predetermined winding tension to the cord using tension control means, the cord 1 is wrapped around the guide pulley 7.
5a to the belt drum 6 through only the guide pulleys 75a to 75f without passing through the brake pulley 74, thereby applying a slight tension to the cord 1 that is only resisted by the guide pulley itself (so-called tension). As shown in FIG. 6, between the frame 70 and the frame 70b, a pair of phototubes 10a and 10b are arranged above and below, and a feed roller 1f and a guide pulley 75a
The cord 1 may be loosened in a U-shape between the two, and the upper and lower limits of the amount of slack may be detected by the phototubes 10a and 10b, and the feed amount of the cord 1 may be adjusted (so-called Festoun).

In addition, instead of the feeding device 7a as described above, the winding device 7 is directly connected to the rubber coating device 40 of the cord 1 as shown in FIG. It is also possible to adopt a method in which the material is directly guided to the guide pulley 75a of the feeding means 73 of the winding device. In the figure, 41 is a cord winding bobbin, 42
4 is an extruder, 43 is an extrusion die, 44 is a cord festoon, 45 is a phototube for the festoon, and 46 is a belt drum. In this method, since the cord is coated with rubber and wound around the belt, deterioration of the material and contamination of foreign substances (adherence preventive agent, etc.) are prevented compared to the above-mentioned take-up roll feeding method. In addition, since it is a hot feed, the belt and cord are in close contact with each other, and there is no need for a winding liner.

FIG. 9 and FIG. 10 show another example of the molding device, and the basic configuration is almost the same as the above device, but
The main difference is that a pair of feeding means for feeding out the cords 1 is provided, so that the two cords 1 are simultaneously wound around the belt symmetrically from the center position of the belt toward the shoulders. The aim is to reduce the winding time to 1/1/2 of that of the above device.
2, thereby doubling productivity.

That is, the screw shafts 71a, 71 in the same direction
rails 71 screwed onto the screw shafts 71a and 71b, respectively, and provided on the frame 70c in parallel with the screw shafts 71a and 71b.
A pair of feeding means 73b and 73c, which are slidably mounted on the belt drums e and 71f and traverse in directions away from each other (arrow directions) from the central position, are juxtaposed in the width direction of the belt drum 6. Due to the rotation, the gears rotate in opposite directions to rotate the screw shafts 71a and 71b in opposite directions,
The pair of feeding means 73b and 73c are configured to move in opposite directions at the same speed. The feeding means 73b and 73c each have arms 77a and 77b that project upward, and a plurality of guide pulleys 75 are attached to each arm 77a and 77b, respectively. Similar to the above embodiment, this arm is slidably biased toward the drum by a spring 85 on the rail 71g, and the roll 78a is brought into contact with the tracing plate 79, and each feeding means is moved toward the belt drum surface as desired. The belt may be movable in the belt width direction while maintaining an interval of .

Note that the two screw shafts 71a and 71b may be threaded in opposite directions, and the two screw shafts may be rotated in the same direction.

Further, a tension detection device (differential transformer type) 80 is provided on the frame 70c, and the brake pulley 74
This tension detection device 80
The tension is detected through the guide roll 80a and the detection roll 80b, and the deviation from the set value is fed back to the brake pulley 74, so that the amount of braking is adjusted. 74a is connected to the brake pulley 7 by a spring 84 via a link.
This is a presser roll that is biased toward the 4th side.

Further, the guide pulley 75a has links 81a, 8
1b, a proximity switch 82 faces this link 81a, and a spring 83 urges a guide pulley 75a in the direction of the arrow with a shaft 83a as a fulcrum. And for some reason code 1
If excessive tension is applied to the cord 1, the link 81 activates a proximity switch 82 to stop feeding the cord 1. In another embodiment, it is also possible to adopt a method in which the pair of feeding means are moved apart from each other in the left-right direction from the center of the drum using only one threaded shaft with left-right and left-right counter-threads.

In the apparatus shown in FIGS. 6 to 8 above, first, the winding start position, winding end position, winding pitch, winding tension set value, etc. are set on the setting board 9, and these are stored in the control unit 90. I'll keep it. The above-mentioned winding start position 31 and end position 32 refer to positions in the width direction of the belt drum, and refer to distances from the center of the belt drum 6, for example. Next, the servo motor 8 is driven by the output from the drive unit 93 to feed out the feeding means 7.
3 is traversed from the standby position and moved to a predetermined winding start position 31. Then, the operator manually presses the tip of the cord against the start position of the belt to crimp it. This can be easily mechanized using a cylinder and link mechanism.

Next, when the automatic movement button is pressed, the belt drum starts rotating, the powder brake 74c is activated by the output from the power supply unit 92, and the cord 1 is fed out with a predetermined tension applied by the brake pulley 74. The feeding means is caused to traverse the belt drum rotating at a constant speed in the direction of the winding end position 32 to continuously wind the belt drum in a spiral shape at a predetermined pitch. The traverse speed at this time is set so that the winding pitch is synchronized with the signal from the belt drum encoder 61, that is, the rotational speed of the belt drum 6.

By feeding out the cord 1 to the forming drum 6, the cord 1 is wound around the belt 4 as shown in FIG. 2, FIG. 3, or FIG. 4. This winding operation can be performed in a so-called one-stroke process. That is, when the winding shown in FIG. 4A is performed using the apparatus shown in FIGS. 6 to 8, the cord 1 may be wound in the direction of the arrow so that the locus draws an S-shape as shown in FIG. 4B. .

In addition, using the apparatus shown in FIGS. 9 and 10,
When winding is performed as shown in FIG. 4A, the two cords 1a and 1b may be wound in a trajectory in the direction of the arrow as shown in FIG. 4C.

Note that instead of traversing by rotating the screw shaft 71 with a motor, other means such as a cylinder may be used to traverse on a rail provided on the machine frame. Furthermore, if the power supply unit 92 and the drive unit 93 are additionally provided with functions such as calculation in the control unit 90, an independent control unit becomes unnecessary.

(Effects of the Invention) As explained above, according to the method of the present invention, the belt reinforcing layer is formed by attaching one or more organic fiber cords to the outer circumferential surface of the belt so that the cord pitches are dense at the belt shoulders. In addition, since the belt is wound continuously in a spiral shape parallel to the circumferential direction so that the winding tension is maximum at the belt shoulder, the difference in stretch between the belt shoulder and the belt center of the vulcanized tire is small. Since the heat shrinkage force of the belt shoulder portion is improved, the effect of preventing lifting of the belt during running is strongly exerted, and therefore, peeling damage to the belt due to lifting during running can be reliably prevented.

Further, according to the apparatus of the present invention, the above method can be carried out efficiently, accurately and reliably.

[Brief explanation of the drawing]

1A, B, and C are cross-sectional explanatory diagrams of an organic fiber cord applied to the implementation of this invention, and FIG.
Figures 3, 4A, and 5 are cross-sectional explanatory diagrams of three types of belt reinforcing layers formed by the method of the present invention, and Figures 4B and 4C are one of the belt reinforcement layers formed by the apparatus of the present invention. An explanatory diagram showing the locus of winding, FIG. 6 is an overall side explanatory diagram of the apparatus used to carry out the method of the present invention, FIG. 7 is a front view of the winding device, and FIG. 8 is a left side view of the winding device. FIG. 9 is a front view of another embodiment of the winding device of the present invention, FIG. 10 is a left side view of FIG. 9, and FIG. 11 is an explanation showing another embodiment of the cord feeding device. 12 are explanatory diagrams of a method for manufacturing a radial tire including a method for forming a belt reinforcing layer according to the present invention. 1...Organic fiber cord, 2...Rubber coating,
4...Belt, 5...Belt drum or belt ring, 6...Belt drum, 7...Wrapping device, 71
a, 71b, 72...screw shaft, 73...feeding means.

Claims (1)

[Claims] 1. A method for manufacturing a radial tire by deforming a cylindrical tire carcass into a toroidal shape and compressing a belt and treads onto the outer surface of the carcass, in which a predetermined number of belts are placed on a belt ring or a belt drum. After lamination, one or more rubber-coated organic fiber cords are placed between the shoulders on the outer circumferential surface of the belt at a pitch of 0.5 to 5.0 mm at the shoulders of the belt, and at the center of the belt. The belt is continuously wound spirally in the circumferential direction of the belt with a pitch of 0.5 to 15.0 mm, while the winding tension is maximum at the shoulder of the belt and minimum at the center of the belt. A method for forming a belt reinforcing layer. 2. The method of forming a belt reinforcing layer according to claim 1, wherein the organic fiber cord is wound symmetrically from the center of the belt toward each shoulder. 3 In a method of manufacturing a radial tire by deforming a cylindrical tire carcass into a toroidal shape and crimping a belt and a tread on the outer surface of the carcass, after laminating a predetermined number of belts on a belt ring or belt drum, this belt A wide rubber sheet is wrapped around the outer circumferential surface of the belt, and one or more non-rubber-coated organic fiber cords are wrapped around it at a pitch of 0.5 to 5.0 mm at the shoulders of the belt and 0.5 mm at the center of the belt. Continuously wrap the belt in a spiral in the circumferential direction with a pitch of ~15.0 mm, while making sure that the winding tension is maximum at the shoulder of the belt and minimum at the center of the belt,
A method for forming a belt reinforcing layer, which further comprises wrapping a wide rubber sheet thereon. 4. The method of forming a belt reinforcing layer according to claim 3, wherein the organic fiber cord is wound symmetrically from the center of the belt toward each shoulder. 5 When manufacturing a radial tire by deforming a cylindrical tire carcass into a toroidal shape and crimping a belt and treads on the outer surface of the tire carcass, one or more organic fiber cords are continuously attached to the outer circumferential surface of the belt in a spiral shape. A device for forming a belt reinforcing layer by winding the cord around the tire, which includes a pair of feeding means for feeding out the cord to be wound toward the belt, and a state in which each of these feeding means is close to each other in the axial direction of the tire, and a state in which they are separated. A belt reinforcing layer forming apparatus comprising: a traverse means for traversing the cord; a traverse control means for controlling the traverse of each of the feeding means; and a tension control means for controlling the winding tension of the cord. 6. The above-mentioned feeding means has a moving frame that traverses, an arm provided on the moving frame, and a plurality of guide pulleys that are held by this arm and guide the cord to be wound. The apparatus for forming a belt reinforcing layer according to item 5. 7. According to claim 5 or 6, the traverse means has a screw shaft that is driven and rotated, and a guide shaft that is screwed onto the screw shaft and guides the traverse of the feeding means. belt reinforcement layer forming device. 8. Claims 5, 6, or 7, characterized in that the traverse control means comprises a motor for driving the screw shaft, its drive unit, and a pulse counter for a belt ring or belt drum. The apparatus for forming the belt reinforcing layer described above. 9. The belt reinforcing layer forming apparatus according to claim 5, 6 or 7, wherein the tension control means comprises a brake pulley and its power supply unit. 10. The belt reinforcing layer according to any one of claims 5 to 8, wherein the tension control means is a plurality of guide pulleys around which the cord to be wound is stretched. forming device.