JP4432536B2 - Carcass layer forming method and tire manufacturing method - Google Patents

Description

  The present invention relates to a carcass layer forming method for forming a carcass layer using a continuous body in which a cord material is coated with unvulcanized rubber in a radial tire manufacturing process and the like, and a tire manufacturing method using the method.

  Conventionally, radial tires are generally manufactured as follows. First, each material of the inner liner, carcass, bead and sidewall rubber is set on the outer peripheral surface of the drum to produce a cylindrical molded body (first molding step). Then, a green tire made of unvulcanized rubber is formed by bonding belts, treads, and the like (second forming step). Thereafter, a raw tire is set in a mold (outer mold) of a vulcanizer, heated and vulcanized while being pressurized from the inside of the tire, and cooled while maintaining the internal pressure as necessary to produce a product tire.

  At that time, a rectangular sheet-like material in which a plurality of cord materials are arranged in parallel to each other and the cord materials are coated with unvulcanized rubber is used as a material for forming the carcass. This sheet-like material is arranged so that the cord material is parallel to the axial direction of the drum in the first molding step, and in the second molding step, the sheet-like material swells at the central portion of the cord material and the interval between the cord materials is increased. It becomes a spread state.

  When performing the second molding step, a rubber bag called a bladder may be used, but since it is inflated with air pressure, the arrangement of the cord material is likely to be non-uniform, and the uniformity of the tire may be impaired. there were. In addition, the manufacture of the above-mentioned sheet-like materials requires large-scale calendar equipment and cutting equipment, and it is necessary to change the shape and size for each product type, making it difficult to handle high-mix low-volume production. Met.

  In order to eliminate the above-mentioned drawbacks, a linear or belt-like continuous body in which one or a plurality of cord materials are coated with unvulcanized rubber is formed on an annular core having a substantially inner surface shape of the tire, and the cord material is substantially a tire. After continuously winding the tire outer periphery side and the tire inner periphery side between the bead portions sequentially so as to be arranged in the radial direction, the continuum on the tire inner periphery side between the bead portions is turned to the folded portion of the carcass layer. A carcass layer forming method including a step of cutting the folded portion back to the tire center side or the tire outer side with respect to the bead material arranged in advance or after the cutting is known (for example, patent document) 1-2). According to this method, the formation operation of the carcass layer is simple, easy to control, high in productivity, suitable for high-mix low-volume production, and less structural restrictions on the product tire.

However, in the above method, since the continuous body (cord material) is wound using the annular core that substantially represents the inner surface shape of the tire, the length of the folded portion is limited when the cut continuous body is folded back with the bead material. The For this reason, it is difficult to manufacture a so-called high turn-up type pneumatic tire in which the tip of the folded portion of the carcass layer reaches the belt layer. Further, when manufacturing a pneumatic tire of a type in which two carcass layers are formed, since the tip positions of the folded portions of the two carcass layers are substantially the same height, separation (separation) occurs at that portion. There was also a problem that it was easy.
JP 2001-171014 A Japanese Patent Laid-Open No. 4-153028

  Therefore, an object of the present invention is to use a carcass layer forming method and its method that can adjust the tip position of the folded portion of the carcass layer and can easily manufacture a so-called high turn-up type pneumatic tire. It is providing the manufacturing method of a tire. Another object of the present invention is to provide a method of forming a carcass layer that can suppress separation even when two carcass layers are formed, and a method of manufacturing a tire using the method.

  The above object can be achieved by the present invention as described below.

  That is, in the method for forming a carcass layer of the present invention, a linear or belt-like continuous body obtained by coating one or a plurality of cord materials with unvulcanized rubber is formed on an annular core having a substantially inner surface shape of a tire. The continuum of the tire inner circumference side between the bead portions after being repeatedly wound sequentially through the tire outer circumference side and the tire inner circumference side between the bead portions so that the cord material is arranged substantially in the tire radial direction. In the method of forming a carcass layer, comprising a step of cutting the folded portion of the carcass layer leaving the folded portion, and then folding the folded portion to the outside of the tire with respect to the bead material disposed after the cutting. Is provided with an adjusting member capable of adjusting the winding length of the tire inner periphery between the bead portions, and the adjusting member is 15% or more of the height from the lower end of the bead core to the outer peripheral end of the annular core. High By the amount, and having a projecting height of the inner peripheral side from the lower end of the bead core.

  According to the method for forming a carcass layer of the present invention, since the adjustment member capable of adjusting the winding length of the tire inner peripheral side between the bead portions is provided on the inner peripheral side of the annular core, the continuous body is wound around the annular core. In this case, the length of the folded portion of the carcass layer can be adjusted. For this reason, the tip position of the folded portion of the carcass layer after folding can be adjusted, and the protruding height of the adjusting member to the inner circumferential side is the height from the lower end of the bead core to the outer circumferential end of the annular core. Since it is 15% or more, it becomes easy to manufacture a so-called high turn-up type pneumatic tire.

  In another carcass layer forming method of the present invention, a linear or belt-like continuous body in which one or a plurality of cord materials are covered with unvulcanized rubber is provided with a substantially inner surface shape of a tire and, if necessary, a bead. The outer circumference side of the tire between the bead parts so that the cord material is arranged substantially in the tire radial direction with respect to the annular core provided with the adjustment member capable of adjusting the winding length of the inner circumference side of the tire between the parts. In the state where the winding length of the tire inner peripheral side between the bead portions of the annular core is increased by another adjustment member, the step of repeatedly winding the tire inner peripheral side sequentially through the tire inner peripheral side, A linear or belt-like continuous body in which one or a plurality of cord materials are coated with unvulcanized rubber is arranged between the tire outer periphery side and the tire inner side between the bead portions so that the cord materials are arranged substantially in the tire radial direction. Winding repeatedly around the circumference A step of cutting the continuum on the tire inner periphery side between the bead portions, leaving a folded portion of the carcass layer, and a step of folding the folded portion to the outside of the tire with respect to the bead material arranged in the bead portion. It is characterized by providing.

  According to another method of forming a carcass layer of the present invention, after the winding process of the continuous body for forming the first carcass layer, the winding length on the tire inner periphery side between the bead portions of the annular core is adjusted by the adjusting member. In the state where the length is increased, the continuum for forming the second carcass layer is wound around the annular core, so that the length of the folded portion of the first carcass layer and the second carcass layer are increased. The length of the folded portion of the layer can be adjusted to be different. For this reason, the front-end | tip position of the folding | turning part of a two-layer carcass layer can be changed, and also when forming a two-layer carcass layer, a separation can be suppressed.

  In any of the above, when winding the tire outer periphery side between the bead portions, the cord material is wound so as to be arranged in the tire radial direction, and the tire inner periphery side winding between the bead portions When performing, it is preferable to wind in the position shifted | deviated by the width | variety of the said continuous body from the position facing from one bead part to the other bead part.

  In that case, since the feeding corresponding to one pitch is performed at the winding portion of the tire inner circumference side between the bead portions, it is not necessary to shift the cord material from the tire radial direction on the tire outer circumference side between the bead portions, and the cord material is more It can be accurately arranged in the tire radial direction (radial).

  On the other hand, the tire manufacturing method of the present invention is a tire manufacturing method in which a carcass layer in which a cord material is arranged in a substantially radial direction of a tire is formed. A step of forming an uncured inner liner rubber layer to form a carcass layer forming surface on an annular core provided with an adjusting member capable of adjusting a winding length of the wrapping length, and any of the above And a carcass layer forming step.

  According to the tire manufacturing method of the present invention, when the carcass layer is formed on the surface of the inner liner rubber layer, the carcass layer forming method of the present invention is employed. Manufacture of a tire that can adjust the tip position and can easily manufacture a so-called high-turn-up type pneumatic tire, or can suppress separation even when two carcass layers are formed. A method can be provided.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this embodiment, as shown in FIGS. 1 and 2, the annular core 32 is moved in the tire rotation direction A <b> 1 while the bobbin 10 that feeds the continuous body 1 is moved annularly by the rotation of the annular body 11. The example of the formation method of the carcass layer which winds 1 sequentially is shown. Further, an example in which an inner liner layer 31 is formed in advance on the formation surface 2 of the carcass layer will be shown.

  In this invention, as shown in FIG. 3, the linear or strip | belt-shaped continuous body 1 which coat | covered the one or several cord material 1a with the unvulcanized rubber 1b is used. As the cord material 1a, for example, an organic fiber such as polyester, rayon, nylon, or a metal wire such as steel can be used. As the unvulcanized rubber 1b, a material considering adhesiveness with other rubber materials such as sidewall rubber is appropriately selected.

  As for the number of arrangement | sequences of the cord material 1a, about 1-10 is preferable, and the width | variety of the linear or strip | belt-shaped continuous body 1 corresponding to this is preferable about 2-100 mm. And in order to ensure joining of the adjacent continuous bodies 1, the shape where the end surface inclined as shown in FIG. 3 is preferable.

  Such a continuous body 1 can be manufactured by an apparatus as shown in FIG. 4, for example. This apparatus includes an extruder 22 for kneading and extruding unvulcanized rubber 1b, a plurality of reels 21 for feeding out a cord material 1a, and a plurality of cord materials 1a arranged in parallel while being covered with unvulcanized rubber 1b in a strip shape (ribbon). And an extrusion head 23 that is extruded into a shape.

  The continuous body 1 extruded in a band shape is wound around the bobbin 10 set on the drive shaft of the winding motor 24 together with the separator 1s. At that time, the separator 1 s is supplied from the separator reel 25. The separator 1s is interposed so that the continuous body 1 is suitably fed from the bobbin 10 and is useful when the adhesive strength between the continuous bodies 1 is large.

  Thus, since the continuum 1 used in the present invention can be manufactured with a relatively small apparatus, and the necessity for changing the shape and size of the continuum 1 for each tire type is small, It becomes easy to cope with a variety of small-quantity production.

  The bobbin 10 is preferably wound with the continuous body 1 in an amount to be wound around the entire tire. However, when the amount is insufficient, the bobbin 10 may be wound using a plurality of bobbins 10 sequentially. In that case, it is preferable to replace the bobbin 10 at a portion where the continuum 1 which will be described later is cut, and the seam portion of the continuum 1 can be eliminated from the carcass layer formed thereby.

  In the present invention, as shown in FIG. 1, the bead portion is arranged such that the cord material 1 a is arranged in a substantially radial direction of the tire with respect to the annular core 32 having a substantially inner surface shape of the tire. The tire outer periphery side TO and the tire inner periphery side TI between 3 are repeatedly wound sequentially. At that time, the formation surface 2 is moved in the tire rotation direction A <b> 1 while using the annular body 11 arranged around the annular core 32 (rotating) and moving the bobbin 10 that feeds the continuous body 1 in an annular shape.

  In the present embodiment, the inner liner layer 31 is formed prior to the formation of the carcass layer. For example, the inner liner layer 31 is formed only on the outer peripheral surface of the main body portion 32d of the annular core 32 as shown in FIG. be able to. In that case, what is necessary is just to affix on the cyclic | annular core 32, extending the outer peripheral side, using the sheet | seat member for formation which consists of unvulcanized inner liner rubber. Alternatively, a method of supplying a ribbon body made of an inner liner rubber and sticking it in the circumferential direction of the annular core 32 while rotating the annular core 32 in the tire rotation direction (A1 in FIG. 1) may be used. In this case, the width of the ribbon body is preferably 3 to 40 mm.

  The annular core 32 has a substantially tire inner surface shape (the outer peripheral surface of the main body portion 32d), and the winding length of the tire inner peripheral side TI between the bead portions can be adjusted on the inner peripheral side of the annular core 32. An adjustment member 32c is provided. At this time, the adjustment member 32c is preferably provided detachably on the main body 32d, and is fastened with, for example, a bolt or the like. The winding length of the tire inner circumferential side TI between the bead portions can be adjusted by changing the length of the surface of the tire inner circumferential side TI of the adjusting member 32c, the mounting height from the main body portion 32d, and the like. The mounting height can be adjusted by interposing a spacer having a predetermined thickness or height.

  As shown in FIG. 5 (b), the adjustment member 32c has an inner circumference from the lower end of the bead core 4a by a height of 15% or more of the height H1 from the lower end of the bead core 4a to the outer peripheral end of the annular core 32. It is preferable to have a protruding height H2 to the side. More preferably, the overhang height H2 is 20% or more of the height H1. When the height is within this range, the tip of the folded portion 5a of the carcass layer 5 can easily reach the belt layer even when a so-called high turn-up type pneumatic tire is manufactured.

  Further, the annular core 32 has a split structure so that it can be easily taken out after the carcass layer is formed, and can be taken out from the inner peripheral side of the green tire after the carcass layer is formed by being divided at the boundary portion 32a. . Moreover, the groove | channel 32b for a cutting | disconnection is provided in the inner peripheral side center of the member 32c for adjustment so that the cutting | disconnection (process mentioned later) of the wound continuous body 1 may be easy.

  On the other hand, the annular body 11 has a structure that can be divided into two, and can be freely connected and divided at the boundary portion 11d. The annular body 11 is arranged around the trunk portion of the annular core 32, that is, around the surface 2 to be formed of the carcass layer, by inserting one end of the annular core 32 in a state where the annular body 11 is divided at that portion. Can do. When the green tire after the carcass layer is formed is removed from the annular body 11, the annular body 11 may be similarly divided. The connecting structure at the boundary portion 11d may be any conventionally known connecting means (for example, a combination of a fitting portion and a lock mechanism).

  The annular body 11 includes a driven shaft 10a for setting the bobbin 10 that feeds the continuous body 1, and a reel 12 for winding the separator 1s. The driven shaft 10a is preferably provided with a tension adjusting mechanism for adjusting the tension applied to the continuum 1. Further, an appropriate power transmission mechanism is provided between the reel 12 and each driven shaft 10a so that the rotation of the driven shaft 10a is transmitted and the reel 12 can take up.

  As shown in FIGS. 2A to 2B, the annular body 11 includes a cylindrical portion by four pairs of support rolls 16 a fixed to the inner peripheral side and four pairs of support rolls 16 b fixed to the outer peripheral side. 11a is sandwiched and supported. A rack 11b is formed around the entire circumference of the cylindrical portion 11a of the annular body 11, and the annular body 11 is rotationally driven by the rotation of the pinion gear 18 provided on the drive shaft of the motor 17. The driven shaft 10a such as the bobbin 10 and the reel 12 are supported by the annular body 11 by the support portion 11c. An appropriate heavy object may be fixed to the annular body 11 in order to balance the weight, and a support roll may be provided near the upper end of the annular body 11 to withstand higher tension.

  By rotating the annular body 11 in the direction of the arrow A2 with the above apparatus configuration, the continuum 1 is wound via the tire outer peripheral side TO and the tire inner peripheral side TI between the bead portions 3 of the annular core 32. Can do.

  At this time, the annular core 32 (that is, the carcass layer forming surface 2) is rotated in the tire rotation direction A1, and for example, it can be performed by rotationally driving three or more holding rollers 13. The holding roller 13 is preferably a rubber roller whose interval can be changed in accordance with the tire size, and for example, a roller roller whose fixing position can be changed with respect to the drive shaft spreading upward can be used.

  The rotation in the tire rotation direction A1 may be performed at a constant speed (in this case, it is wound in a spiral shape), but when the tire outer circumferential side TO is wound between the bead portions 3, the cord material 1a is used as the tire radius. Any attempt to place it in a direction requires intermittent rotation. That is, when winding the tire inner peripheral side TI between the bead portions 3, the winding is performed from one bead portion 3 to the other bead portion 3 at a position shifted by the width of the continuous body 1 from the facing position. In this case, the rotation in the tire rotation direction A1 may be performed only when the rotation position of the annular body 11 is within a specific range. At that time, depending on the distance between the winding position of the continuous body 1 and the bobbin 10, the adjustment of the rotation amount in the tire rotation direction A1 and the rotation in the reverse direction are effective.

  By repeating the above operation, the continuous body 1 can be wound around the entire surface of the annular core 32 with the inner liner layer 31 partially interposed therebetween, as shown in FIG.

  In the present invention, as shown in FIG. 5 (b), the continuum 1 on the tire inner peripheral side TI between the bead portions 3 is cut leaving the folded portion 5 a of the carcass layer 5. The cutting may be performed at the portion of the cutting groove 32b of the annular core 32 using an appropriate cutting device.

  Before or after the cutting, the bead material 4 is disposed as shown in FIG. As the bead material 4, a bead core 4a (bead wire), a bead filler 4b, a reinforcing layer around the bead (not shown), or the like is appropriately used.

  Next, as shown in FIG. 5C, the carcass layer 5 is formed by folding the folded portion 5 a to the outside of the tire with respect to the arranged bead material 4. In the present invention, since the adjustment member 32c capable of adjusting the winding length of the tire inner peripheral side TI between the bead portions 3 is provided on the inner peripheral side of the annular core 32, for example, a high turn-up type pneumatic tire Can be produced, the tip of the folded portion 5a of the carcass layer 5 can reach the belt layer.

  After the carcass layer 5 is formed, a raw tire made of unvulcanized rubber can be formed by laminating side wall rubber, a belt, a tread, and the like in the same manner as in the conventional tire manufacturing method. The annular core 32 is preferably removed at this stage. Thereafter, a raw tire is set in a mold (outer mold) of a vulcanizer, heated and vulcanized while being pressurized from the inside of the tire, and cooled while maintaining the internal pressure as necessary to produce a product tire.

[Other Embodiments]
Hereinafter, other embodiments of the present invention will be described.

  (1) In the above-described embodiment, the example in which the annular core provided with the adjustment member having a substantially crescent-shaped cross section is shown. However, as shown in FIGS. 6 (a) to 6 (b), the carcass layer 5 is folded. An annular core 33 having a magnet plate 33a that can be attached and detached by magnetic force on the inner peripheral side of the annular core 33 may be used so that automation can be easily performed when the portion 5a is folded back to the tire outer side. 6A is a front view of the annular core, and FIG. 6B is a longitudinal sectional view of the annular core.

  That is, the annular core 33 includes a main body part 33d that can be divided into a plurality of parts, a plurality of connecting parts 33c that are erected from the inner peripheral side of the main body part 33d and whose height (length) can be adjusted, and the respective connecting parts 33c. And a ring portion 33b that forms an annular ring as a whole, and an arc-shaped magnet plate 33a that is magnetically attached to the ring portion 33b. The magnet plate 33a is divided into a plurality of pieces in the circumferential direction and is divided into two at the center in the width direction. In this embodiment, the connecting portion 33c, the ring portion 33b, and the magnet plate 33a constitute an adjustment member that can adjust the winding length on the tire inner peripheral side between the bead portions.

  When the folded portion 5a of the carcass layer 5 is folded after the continuous body is wound using the annular core 33, it can be performed by, for example, a method as shown in FIGS. First, as shown in FIG. 7A, the continuous body 1 is cut along the divided portion of the magnet plate 33a divided into two at the center in the width direction.

  Next, as shown in FIG. 7 (b), the winding rod 35 including a magnet 35a rotatably connected to the tip via a hinge 35b is operated to turn the magnet plate 33a through the folded portion 5a. Magnet 35a. At this time, in order to sufficiently secure the magnetizing force between the magnet 35a and the magnet plate 33a, the width of the magnet plate 33a is preferably 10 mm or more, particularly preferably 15 mm or more.

  Next, as shown in FIG. 7C, the winding rod 35 is operated to move the magnet 35a obliquely downward, so that the folded portion 5a is detached from the annular core 33 together with the magnetized magnet plate 33a. Let

  Next, as shown in FIG. 7C, the winding rod 35 is operated to move the magnet 35a obliquely downward, so that the folded portion 5a is detached from the annular core 33 together with the magnetized magnet plate 33a. Let At this time, the magnet plate 33a is detached from the ring portion 33b.

  Next, as shown in FIG. 7 (d), the winding rod 35 is operated to move the magnet 35 a to the outside of the annular core 33, thereby folding the folded portion 5 a. Further, the winding rod 35 is operated to wind up the folded portion 5a to the state shown in FIG.

  Finally, as shown in FIG. 7 (e), by operating the affixing rod 36 having a roller 36a connected to the tip via a hinge 36b having a biasing means and pressing the roller 36a, the folded portion 5a is attached to the carcass layer 5. At this time, it is preferable that the roller 36a is pushed upward while being pressed by the bias of the hinge 36b so that the remaining of air is reduced.

  In the above-described embodiment, an example in which the folding portion 5a is held by the winding rod 35 using the magnetic adhesion force is shown. However, the winding rod 35 is held by using vacuum suction, a gripping mechanism, an adhesive force, and the like. It is also possible.

  (2) In the above-described embodiment, an example in which only one carcass layer is formed has been described. However, it is also possible to form two or more carcass layers as shown in FIG. In that case, it is possible to use, for example, an annular core 33 similar to the above (1) to which another adjustment member 34 is added. In this embodiment, another adjusting member 34 is magnetically attached to the magnet plate 33a via the first carcass layer 5, and forms a ring ring 34b as a whole, and a magnetic part is formed on the ring portion 34b. And an arcuate inner peripheral magnet plate 34a to be worn.

  That is, as described above, first, a linear or belt-like continuous body in which one or a plurality of cord materials are covered with unvulcanized rubber is provided with a substantially tire inner surface shape and, if necessary, a tire between bead portions. With respect to the annular core 33 provided with the adjusting members 33a to 33c capable of adjusting the winding length on the inner peripheral side, the outer peripheral side of the tire between the bead portions is arranged so that the cord material is arranged substantially in the tire radial direction. A process of repeatedly winding the tire inner periphery side sequentially is performed.

  Next, as shown in FIG. 8, in the state where the winding length on the tire inner peripheral side between the bead portions of the annular core 33 is lengthened by another adjusting member 34, Alternatively, a linear or belt-like continuous body in which a plurality of cord materials are coated with unvulcanized rubber, and a tire outer circumferential side and a tire inner circumferential side between bead portions so that the cord materials are arranged substantially in the tire radial direction. The process of repeatedly winding through and sequentially is performed.

  Next, a step of cutting the continuum on the tire inner periphery side between the bead portions is performed while leaving the folded portions of the carcass layers 5 and 5 ′. First, the folded portion 5 ′ a of the second layer is cut. . The cut-back portion 5'a is detached and turned back together with the inner peripheral side magnet plate 34a by operating the winding rod 35 in the same manner as in (1) above.

  After the ring portion 34b is detached, the folded portion 5a of the first layer is cut, and the folded portion 5a is detached and folded together with the magnet plate 33a by operating the winding rod 35 in the same manner as the above (1). It is. Thereafter, in the same manner as in the above (1), the sticking rod 36 is operated to stick the two-layer folded portions 5a and 5'a. In this manner, the process of turning the folded portion back to the outside of the tire with respect to the bead material arranged in the bead portion is performed in two steps.

  (3) In the above-described embodiment, an example in which winding is performed while keeping the width of the continuous body 1 constant has been described. However, as illustrated in FIG. 9A, the width of the continuous body 1 increases toward the tire outer peripheral side. In this way, the width of the continuous body 1 to be wound may be changed. As a result, the cord material can be arranged in the tire radial direction with no gap or overlap between the cord materials.

  At this time, in order to change the width of the continuous body 1, for example, the rotation of the annular body is performed using a guide roller having a larger diameter than the center and a guide roller having a diameter larger than the center. What is necessary is just to pass through the continuous body 1 switching both sequentially according to a period. Moreover, what is necessary is just to send out the continuous body 1 via a nip roller, changing a nip space | interval according to the rotation period of an annular body.

  (4) In the embodiment of the above (3), an example in which the continuum is wound in a state where there is no gap or overlap is shown. However, as shown in FIGS. There may be an overlap 1c. These occur when winding is performed with the width of the continuum 1 being constant, but as the width of the continuum 1 is smaller, the width of the gap 1d and the overlap 1c is smaller. The gap 1d and overlap 1c of the continuum can be ignored when the linear continuum 1 in which one cord material, which is the thinnest continuum 1, is coated with unvulcanized rubber is used or close to it. In addition, when winding the tire inner circumference side between the bead portions, it is not necessary to shift the position as described above, and it is only necessary to move the formation surface of the carcass layer in the tire rotation direction at a constant speed. . Therefore, the above is the most preferable embodiment in terms of simplicity of the winding operation and the like.

  (5) In the above-described embodiment, an example in which the bobbin that rotates the annular body to send the continuous body is moved annularly is shown. However, the annular body that serves as a guide is fixed, and the drive mechanism is provided on the bobbin side to travel. A part may be configured and the traveling part may be self-propelled. In that case, for example, a plurality of counter rollers that sandwich the annular body from the inner peripheral side and the outer peripheral side may be provided in the traveling unit, and any of them may be driven by a motor or the like, and can be in contact with the electrode rail provided on the annular body. An electrode may be provided to supply power. At that time, it is necessary to fix the annular body, but it may be fixed at a portion that avoids the trajectory of the traveling portion.

  As described above, the method in which the traveling unit is allowed to self-run can increase the winding speed of the continuum, and thus is particularly effective when a narrow continuum is used. Note that the winding operation of the present invention is not necessarily performed automatically.

  (6) In the above-described embodiment, an example in which the inner liner layer is formed by pasting a sheet-like unvulcanized rubber to the annular core in advance is shown. In the present invention, the carcass layer and the inner liner layer are simultaneously formed. It may be formed by wrapping around an annular core.

  In that case, in order to form the inner liner layer at the same time as the formation of the carcass layer, a ribbon body made of, for example, an unvulcanized inner liner rubber is provided upstream of the bobbin 10 of the annular body 11 as shown in FIGS. It is sufficient to provide a bobbin for supplying. As a result, the ribbon body is repeatedly wound around the surface of the annular core 32 sequentially through the tire outer peripheral side TO and the tire inner peripheral side TI between the bead portions 3, so that the inner liner is wound prior to winding the continuous body 1. Layers can be formed.

  As the ribbon body, an unvulcanized inner liner rubber is extruded into a ribbon shape by an extruder, and a ribbon body having a width slightly larger than that of the continuous body 1 is used in consideration of a joining margin (overlapping portion). Is preferred. At that time, it is preferable to adjust the winding position so that the joining margin portion is not wound around the upper surface of the continuum 1 that has already been wound. Moreover, it is preferable to use a separator as in the case of the continuum 1.

The schematic perspective view for demonstrating the formation method of the carcass layer of this invention It is a figure which shows an example of the apparatus used for the formation method of the carcass layer of this invention, (a) is front sectional drawing, (b) is side sectional drawing of the principal part. Sectional drawing which shows an example of the continuous body used by this invention The perspective view which shows an example of the manufacturing apparatus of the continuous body used by this invention Process drawing for demonstrating the formation method of the carcass layer of this invention It is a figure of the cyclic | annular core used for the other example of the formation method of the carcass layer of this invention, (a) is a front view, (b) is a longitudinal cross-sectional view Process drawing for demonstrating the other example of the formation method of the carcass layer of this invention Process drawing for demonstrating the other example of the formation method of the carcass layer of this invention The front view which shows the example of arrangement | positioning of the continuous body of the carcass layer formed by this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Continuum 2 Carcass layer formation surface 3 Bead part 4 Bead material 4a Bead core 5 Carcass layer 5a Carcass layer folded part 10 Bobbin 11 Annular body 31 Inner liner layer 32 Annular core 32c Adjustment member 33 Annular cores 33a-33c Adjustment Material TO Tire outer peripheral side TI Tire inner peripheral side

Claims (4)

The cord material is arranged in a substantially tire radial direction with respect to an annular core having a substantially inner surface shape of a linear or belt-like continuous body in which one or a plurality of cord materials are coated with unvulcanized rubber. As described above, after repeatedly winding the tire outer peripheral side and the tire inner peripheral side between the bead portions in order, and cutting the continuous body on the tire inner peripheral side between the bead portions, leaving the folded portion of the carcass layer, Next, in the method of forming a carcass layer, comprising a step of folding the folded portion to the outside of the tire with respect to the bead material disposed after the cutting.
On the inner peripheral side of the annular core, an adjustment member capable of adjusting the winding length of the tire inner peripheral side between the bead portions is provided, and the adjustment member is arranged from the lower end of the bead core to the outer peripheral end of the annular core. A method of forming a carcass layer, characterized by having a protruding height from the lower end of the bead core to the inner peripheral side by a height of 15% or more of the height of the bead core.   A linear or belt-like continuum in which one or more cords are coated with unvulcanized rubber has a substantially tire inner surface shape, and the winding length on the tire inner circumference side between bead portions can be adjusted as necessary. Winding around the annular core provided with the adjustment member repeatedly through the tire outer peripheral side and the tire inner peripheral side sequentially between the bead portions so that the cord material is arranged substantially in the tire radial direction; In a state in which the winding length on the tire inner peripheral side between the bead portions of the annular core is increased by another adjusting member, one or a plurality of cord materials are made of unvulcanized rubber with respect to the annular core. A step of winding the coated linear or belt-like continuous body sequentially through the tire outer peripheral side and the tire inner peripheral side between the bead portions so that the cord material is arranged substantially in the tire radial direction; In front of the inner circumference of the tire between parts A step of cutting the continuous body, leaving the folded portion of the carcass layer, the method of forming the carcass layer and a step of folding the folded portion to the tire outer side with respect to the bead member disposed in the bead portion.   When winding the tire outer circumference side between the bead portions, the cord material is wound so as to be arranged in the tire radial direction, and when winding the tire inner circumference side between the bead portions, The method of forming a carcass layer according to claim 1 or 2, wherein winding is performed from a bead portion to the other bead portion at a position shifted by a width of the continuum from an opposing position. In a tire manufacturing method in which a carcass layer in which a cord material is arranged substantially in the tire radial direction is formed,
A carcass is formed by forming an unvulcanized inner liner rubber layer on an annular core provided with an adjustment member capable of adjusting the winding length of the inner circumference of the tire between the bead portions and having an inner shape of the tire. A method for manufacturing a tire, comprising: a step of forming a surface on which a layer is formed; and a step of forming a carcass layer according to claim 1.

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