JP5358272B2 - Unvulcanized tire manufacturing apparatus and unvulcanized tire manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To highly accurately form various unvulcanized tires having different outer shapes. <P>SOLUTION: In an apparatus of manufacturing the unvulcanized tires, an approaching/separating means 14 that moves folding arms 13 in the direction of a drum shaft O and make them approach each other or separate from each other and a turning means 15 that turns the folding arms 13 around the base end part 13a thereof and moves its tip end parts 13c, 13d in the radial direction, can be mutually independently driven. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an unvulcanized tire manufacturing apparatus and an unvulcanized tire manufacturing method.

Conventionally, an unvulcanized tire has been manufactured by extrapolating a cylindrical tire constituent member to a drum main shaft and extrapolating an annular bead portion to the tire constituent member, for example, as shown in Patent Document 1 below. A bead locking process in which the lock segment is moved radially outward to bring the bead portion and the tire constituent member into close contact with each other, and the pair of bead lock segments are moved closer to each other in the drum axial direction while the tire constituent member has a drum axial direction than the bead. A bulging step for bulging and deforming the main body located inside the drum, and the folding arm is moved inward in the drum axial direction by contact / separation means, and the tip of the folding arm is laid on the bulged and deformed tire component. By doing so, both ends located on the outer side in the drum axial direction than the bead in the tire constituent member are folded back to the outer side in the radial direction and unvulcanized It is formed through the folding forming a tire, in this order.
Thereafter, this unvulcanized tire is formed into a product tire by being vulcanized in a state where the bead portion is pushed inward in the tire width direction and the sidewall portion is bulged and deformed outward in the tire width direction. Is done.

JP-T-2001-525748

  Incidentally, in recent years, there has been an increasing demand for highly accurate formation of various unvulcanized tires having different outer shapes.

  The present invention has been made in consideration of such circumstances, and an unvulcanized tire manufacturing apparatus and an unvulcanized tire manufacturing apparatus that can form various unvulcanized tires having different external shapes with high accuracy. It aims to provide a method.

In order to solve the above problems and achieve such an object, the unvulcanized tire manufacturing apparatus of the present invention is arranged in a drum main shaft and a plurality of devices arranged in the circumferential direction on the outer peripheral side of the drum main shaft. And a pair of bead lock segments supported so as to be movable in the radial direction, and a plurality of bead lock segments arranged in the circumferential direction in a state extending along the drum shaft direction on the outer peripheral side of the drum main shaft, A fold end arm whose base end portion is rotatably connected to each of the outer peripheral sides of the drum main shaft from each of the pair of bead lock segments to the outside in the drum axis direction, and the fold arm is moved in the drum axis direction to each other. An apparatus for producing an unvulcanized tire, comprising: an approach / separation means for approaching and separating; and a turning means for turning a folding arm about a base end portion thereof to move a distal end portion in a radial direction. Each moving means and the rotation means, and a drivable independently of each other, said moving means comprises a first piston that is movably disposed in the first cylinder chamber, a first cylinder chamber By supplying fluid and moving the first piston, the folding arm is moved in the drum axis direction, and the rotating means includes a second piston movably disposed in the second cylinder chamber, and the second cylinder A fluid is supplied to the chamber and the second piston is moved to rotate the folding arm, so that the first cylinder chamber and the second cylinder chamber are independent from each other. An inner cylinder portion having the first cylinder chamber formed on the surface, and an outer cylinder slidably fitted to the inner cylinder portion so as to be slidable in the drum axis direction. The second piston protrudes A piston cylinder member, and an outer cylinder portion that is slidably fitted to the piston cylinder member so as to be slidable in the drum axial direction, and has the second cylinder chamber formed on an inner peripheral surface thereof. A base end portion of the folding arm is connected to any one of the outer cylindrical portions, and the other portion and an intermediate portion of the folding arm are connected via a link, and the drum main shaft includes a drum shaft. Screw shafts rotatably supported around the screw shaft are disposed, and the screwing directions are opposite to each other on both sides of the outer peripheral surface of the screw shaft located on both sides of the central portion along the drum shaft direction. The male screw portions are formed separately, and nuts to which the inner cylindrical portions are connected are screwed to the male screw portions .

  Further, in the method for producing an unvulcanized tire according to the present invention, a cylindrical tire constituent member is extrapolated to the drum main shaft, and an annular bead is extrapolated to the tire constituent member. A bead locking process in which the bead and the tire component are brought into close contact with each other, and the pair of bead lock segments are moved closer to each other in the drum axial direction while the tire constituent member is positioned on the inner side in the drum axial direction than the bead. A bulging process for bulging and deforming the main body, and moving the folding arm in the drum axial direction while moving its tip end radially outward, thereby causing the tire component to be more outward in the drum axial direction than the bead. A folding step of folding the both end portions positioned radially outward to form an unvulcanized tire, and a method for producing an unvulcanized tire. Te, and forming an unvulcanized tire by using the apparatus for manufacturing a green tire of the present invention.

In this invention, since the contacting / separating means and the rotating means can be driven independently from each other, the turning arm is rotated by the rotating means so that the tip end portion thereof moves radially outward. By the contact / separation means, the folding arm can be moved not only in the drum axis direction but also in the drum axis direction.
Therefore, it is possible to easily and reliably adjust the magnitude of the pressing force applied to the both end portions and the main body portion of the tire constituent member from the tip end portion of the folding arm during the folding step, and various external shapes are different. The unvulcanized tire can be formed with high accuracy.
Thereby, for example, in the bulging process, the main portion of the tire constituent member is bulged and deformed in a toroidal shape in cross-sectional view along the drum axis direction, and then the folding arm is rotated as described above in the folding process. When the both end portions of the component member are folded back outward in the radial direction, the folding arm is moved forward and backward in the drum axial direction along the outer shape of the side portion of the main body portion, so that the tip end portion of the folding arm is moved to the main body. It is possible to prevent the tire from being caught on the side portion, and similarly to the product tire, the unvulcanized tire can be formed in a toroidal shape in a sectional view along the tire width direction.
In addition, as the sidewall portion gradually extends from the outer side in the tire radial direction toward the inner side, the unvulcanized rubber gradually extends toward the outer side in the tire width direction and the bead portion is located on the outermost side in the tire width direction. In a tire, during vulcanization, the bead portion is pushed inward in the tire width direction and the sidewall portion is held in a state of being bulged and deformed outward in the tire width direction. There is a risk of the shape being deformed due to torsional deformation, or cracking may occur in the bead portion located in the vicinity of the bead, and at the time of this vulcanization, the unvulcanized tire is Due to the deformation, it is known that it is difficult to improve the uniformity and balance of the product tire.

Further , the contacting / separating means is configured to supply the fluid to the first cylinder chamber and move the first piston to move the folding arm in the drum axis direction, and the rotating means is configured to move the fluid to the second cylinder chamber. And the second piston is moved to rotate the folding arm, so that both of these means can be reliably realized without complicating the structure or increasing the weight. Can do.
Furthermore, since the first cylinder chamber and the second cylinder chamber are independent spaces, the respective fluid pressures do not affect each other, so that the folding arm can be operated easily and with high accuracy. it can.

Furthermore , the folding arm is moved in the drum axis direction by sliding the piston cylinder member in the drum axis direction with respect to the inner cylinder portion. Further, the outer cylinder portion is slid in the drum axial direction with respect to the piston cylinder member, and the distance between the connecting portion with the link on the other side and the base end portion of the folding arm is changed, so that the link is connected to the other side of the other side. The folding arm is rotated around the portion, and the folding arm is rotated around the base end so that the distal end thereof moves in the radial direction.

  Further, in the bulging step, the main portion of the tire constituent member is moved while the pair of bead lock segments are moved closer to each other in the drum axial direction while the bead is supported from the outer side in the drum axial direction by the tip end portion of the folding arm. May be bulged and deformed.

In this case, since the bead is supported from the outside in the drum axial direction by the tip end portion of the folding arm during the bulging step, the main portion of the tire constituent member is inflated while moving the pair of bead lock segments closer to the drum axial direction. When deforming out, the bead can surely follow the movement of the bead lock segment, and an unvulcanized tire can be formed with high accuracy.
In addition, such a function and effect can be achieved by using the folding arm without providing a dedicated means, and the complexity of the structure can be avoided.

  According to the present invention, various unvulcanized tires having different outer shapes can be formed with high accuracy.

BRIEF DESCRIPTION OF THE DRAWINGS It is a manufacturing apparatus of the unvulcanized tire of one Embodiment concerning this invention, Comprising: The upper half is front sectional drawing which shows a standby state, and the lower half is front sectional drawing which shows the state which formed the unvulcanized tire. . It is a partially expanded view which shows a standby state in the manufacturing apparatus of the unvulcanized tire of FIG. FIG. 3 is a partially enlarged view showing a bead lock process in the unvulcanized tire manufacturing apparatus shown in FIGS. 1 and 2. FIG. 4 is a partially enlarged view showing an initial stage of a bulging process in the unvulcanized tire manufacturing apparatus shown in FIGS. 1 to 3. FIG. 5 is a partially enlarged view showing a final stage of a bulging process in the unvulcanized tire manufacturing apparatus shown in FIGS. 1 to 4. FIG. 6 is a partially enlarged view showing a folding step in the unvulcanized tire manufacturing apparatus shown in FIGS. 1 to 5. It is a manufacturing apparatus of an unvulcanized tire of other embodiments concerning the present invention, an upper half is a front sectional view showing a standby state, and a lower half is a front sectional view showing the state where an unvulcanized tire was formed. is there.

Hereinafter, an embodiment of an apparatus for producing an unvulcanized tire according to the present invention will be described with reference to FIGS. 1 to 6.
The unvulcanized tire manufacturing apparatus 1 includes a drum main shaft 11 and a pair of bead lock segments 12 that are arranged in the circumferential direction on the outer peripheral side of the drum main shaft 11 and supported so as to be movable in the radial direction. Are arranged in the circumferential direction in a state extending along the direction of the drum axis O on the outer peripheral side of the drum main shaft 11, and the base end portion 13 a is arranged on the outer peripheral side of the drum main shaft 11. A folding arm 13 rotatably connected to each part of the bead lock segment 12 that is spaced outward in the direction of the drum axis O, and contact / separation means for moving the folding arm 13 in the direction of the drum axis O to approach and separate each other. 14 and a turning means 15 for turning the folding arm 13 around its proximal end portion 13a and moving the distal end portion in the radial direction.

The drum main shaft 11 is formed in a cylindrical shape, extends along the horizontal direction, and is rotatably supported by a drive unit (not shown). Hereinafter, the central axis of the drum main shaft 11 is referred to as a drum axis O.
A screw shaft 16 is provided in the drum main shaft 11 so as to be coaxial with the drum shaft O and rotatably supported by a drive unit (not shown). Male screw portions 17 whose screwing directions are opposite to each other are formed on both side portions of the outer peripheral surface of the screw shaft 16 located on both sides of the central portion along the drum axis O direction.

Here, in the drum main shaft 11, a plurality of slits 18 extending along the direction of the drum shaft O are formed at intervals in the circumferential direction at portions of the screw shaft 16 that are opposed to the male screw portion 17 in the radial direction. A nut 19 is screwed to each of the male screw portions 17 of the screw shaft 16, and a block body 20 protruding from the drum main shaft 11 into the slit 18 is externally fitted to each nut 19. A cylindrical sliding body 21 is externally fitted to each block body 20. An inner cylinder portion 23 in which a first cylinder chamber 22 to be described later is formed is fitted on the outer portion of each sliding body 21 in the drum axis O direction.
As described above, when the screw shaft 16 is rotated with respect to the nut 19 by the drive unit, the block body 20, the sliding body 21, and the inner cylinder portion 23 together with the nut 19 are opposite to each other along the drum axis O direction. Move and move away by distance.

  A plurality of guide grooves 24 that extend in the radial direction and open toward the outside in the direction of the drum axis O are formed at the inner ends of the sliding body 21 in the direction of the drum axis O. The intervals in the circumferential direction between the guide grooves 24 adjacent in the circumferential direction are all equal. In each guide groove 24, the bead lock segment 12 is arranged so as to be movable in the radial direction, and the receiving plate portion is directed to the outer side in the drum axis O direction at the radially inner end of each of the bead lock segments 12. 25 is protrudingly provided.

  Here, a ring-shaped bead lock cylinder chamber 26 coaxial with the drum shaft O is formed at the inner end of the inner cylinder portion 23 in the drum shaft O direction. The bead lock cylinder chamber 26 is formed on the inner peripheral surface of the inner cylindrical portion 23 and opens toward the inner side in the radial direction. In each bead lock cylinder chamber 26, a ring-shaped bead lock piston 27 that partitions the bead lock cylinder chamber 26 in the direction of the drum axis O is disposed so as to be movable in the direction of the drum axis O. Each bead lock piston 27 is connected to an extended portion 27 a that protrudes inward in the drum axis O direction from the inner end wall in the drum axis O direction in the bead lock cylinder chamber 26. The inner end of the extending portion 27 a in the drum axis O direction and the inner end of the bead lock segment 12 in the radial direction are connected via a first link 28. Both end portions of each first link 28 are rotatably connected to the extending portion 27a and the bead lock segment 12, respectively. Each first link 28 gradually extends outward in the radial direction from the outer side to the inner side in the drum axis O direction.

  When high-pressure fluid is supplied from a fluid source (not shown) to the inner chamber 26a located inside the bead lock piston 27 in the drum axis O direction in the bead lock cylinder chamber 26, the bead lock piston 27 is moved to the drum axis O. The bead lock segment 12 is moved radially inward via the first link 28. On the other hand, when high-pressure fluid is supplied to the outer chamber 26b located outside the bead lock piston 27 in the bead lock piston 27 in the bead lock cylinder chamber 26, the bead lock piston 27 moves inward in the drum axis O direction. The bead lock segment 12 is moved radially outward via the first link 28.

Here, a seal member 29 is separately provided at an inner end portion of each sliding body 21 in the drum axis O direction.
The seal members 29 extend along the radial direction and are airtightly held by the sliding body 21, and extend along the drum axis O direction to extend the bead lock segment 12 from the outside in the radial direction. A front end portion 29b to be covered and an intermediate portion 29c that connects the base end portion 29a and the front end portion 29b, extends along the direction of the drum axis O, and is folded in the radial direction are provided.

  As described above, the bead lock segment 12 moves outward in the radial direction, and supports the bead B from the inner side in the radial direction via the distal end portion 29b of the seal member 29 and the tire constituent member K described later. When this is done, the distal end portion 29b of the seal member 29 is sandwiched between the bead lock segment 12 and the tire constituent member K in the radial direction. Thereby, in the tire constituent member K, the inside of the main body located on the inner side in the drum axis O direction than the bead B is kept airtight.

The contacting / separating means 14 includes a first piston 30 movably disposed in the first cylinder chamber 22, and supplies the fluid to the first cylinder chamber 22 to move the first piston 30, thereby moving the folding arm 13. It is configured to move in the direction of the drum axis O.
The rotating means 15 includes a second piston 32 movably disposed in the second cylinder chamber 31, and supplies the fluid to the second cylinder chamber 31 to move the second piston 32, thereby moving the folding arm 13. It is comprised so that it may rotate.
The first cylinder chamber 22 and the second cylinder chamber 31 are independent spaces, and the contact / separation means 14 and the rotation means 15 can be driven independently of each other.

  In the present embodiment, the first cylinder chamber 22 is formed in an intermediate portion of the inner cylinder portion 23 in the drum axis O direction. The first cylinder chamber 22 is formed on the outer peripheral surface of the inner cylindrical portion 23 and opens toward the outer side in the radial direction. A piston cylinder member 33 is externally fitted to the inner cylinder part 23 so as to be slidable in the drum axis O direction. The flange-shaped first piston 30 protrudes from the inner peripheral surface of the piston cylinder member 33, and the first piston 30 is disposed in the first cylinder chamber 22 of the inner cylinder portion 23. The piston cylinder member 33 is externally fitted to the inner cylinder part 23 so as to be slidable in the direction of the drum axis O while maintaining airtightness in the first cylinder chamber 22.

  Further, in the present embodiment, the outer cylindrical portion 34 is fitted on the piston cylindrical member 33 so as to be slidable in the direction of the drum axis O, and the second cylinder chamber 31 is formed on the inner peripheral surface of the outer cylindrical portion 34. It is open toward the inside in the radial direction. Here, the flange-shaped second piston 32 protrudes from the outer peripheral surface of the piston cylinder member 33, and the second piston 32 is disposed in the second cylinder chamber 31. The first piston 30 is located on the inner side in the drum axis O direction than the second piston 32.

The folding arm 13 includes a cylindrical arm body 13b extending in the direction of the drum axis O, and a flat plate-like base projecting radially inward from the outer end of the arm body 13b in the drum axis O direction. An end portion 13a and a first folding roller (tip portion) 13c and a second folding roller (tip portion) 13d that are rotatably supported at the inner end portion of the arm body 13b in the drum axis O direction are provided.
The first folding roller 13c has a larger diameter than the second folding roller 13d. The arrangement positions along the circumferential direction of the first folding roller 13c and the arm main body 13b are substantially the same as each other, and are displaced from the arrangement position along the circumferential direction of the second folding roller 13d. The first folding roller 13c and the second folding roller 13d are coupled to a bracket 13e that is rotatably disposed at the inner end of the arm body 13b. The first folding roller 13c is disposed on the outer side in the radial direction than the second folding roller 13d.

A base end portion 13 a of the folding arm 13 is rotatably connected to an outer end portion of the outer cylindrical portion 34 in the drum axis O direction.
An inner end portion of the piston cylinder member 33 in the drum axis O direction and an intermediate portion of the arm main body 13 b are connected via a second link 35. The second link 35 extends substantially along the drum axis O direction, the inner end portion in the drum axis O direction is connected to the piston cylinder member 33, and the outer end portion in the drum axis O direction is the arm main body 13b. It is connected to. Further, the inner end portion of the second link 35 is located slightly inward in the radial direction from the outer end portion.

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

First, the unvulcanized tire manufacturing apparatus 1 is set in a standby state as shown in FIGS.
That is, the screw shaft 16 is rotated with respect to the nut 19 to move the sliding body 21 to a desired position along the drum axis O direction, and high pressure fluid is supplied to the inner chamber 26 a of the bead lock cylinder chamber 26. The beadlock segment 12 is positioned at the inner limit in the radial direction, and the high pressure fluid is supplied to the inner chamber 22a of the first cylinder chamber 22 located in the drum shaft O direction with respect to the first piston 30 to return the arm 13. Is positioned at the outer limit in the direction of the drum axis O, and the high-pressure fluid is supplied to the outer chamber 31b of the second cylinder chamber 31 that is positioned outside of the second piston 32 in the direction of the drum axis O, so Located in the inner limit of the direction.

In this standby state, the first folding roller 13c is disposed on the outer surface of the surface of the bead lock segment 12 facing the outside in the drum axis O direction, and the second folding roller 13d is disposed on the receiving plate portion 25. ing. At this time, the outer ends in the radial direction of the first folding roller 13c and the bead lock segment 12 are located at substantially the same radial position.
Next, the bead B with filler F and the cylindrical tire constituent member K molded on a band molding machine (not shown) are not added by a conveying means (not shown) with the bead B extrapolated to the tire constituent member K. It conveys toward the manufacturing apparatus 1 of a sulfurated tire, and the tire structural member K is extrapolated to the drum main shaft 11. Here, the interval along the drum axis O direction of the bead B with the filler F is equal to the interval along the drum axis O direction of the bead lock segment 12.

  Next, as shown in FIG. 3, a high-pressure fluid is supplied to the outer chamber 26b of the bead lock cylinder chamber 26, and the bead lock piston 27 is moved together with the extending portion 27a toward the inside in the drum axis O direction. By swinging the first link 28, the bead lock segment 12 is moved while being guided by the guide groove 24 radially outward. As a result, the bead lock segment 12 is pressed against the bead B from the inside in the radial direction via the seal member 29 and the tire constituent member K, and the tire constituent member K is sandwiched between the seal member 29 and the bead B in the radial direction. The inside of the main body located between the beads B among the constituent members K is kept airtight.

  At this time, the first and second folding rollers 13 b and 13 c are moved outward in the radial direction by the bead lock segment 12, whereby the outer cylinder portion 34 is moved in the drum axis O direction with respect to the piston cylinder member 33. When moved inward, the distance between the base end 13a of the folding arm 13 and the inner end of the second link 35 in the direction of the drum axis O is slightly shortened, so that the folding arm 13 is centered on the base end 13a. The second link 35 also rotates outward in the radial direction around the inner end portion thereof. Thereby, the 1st folding | turning roller 13c and the 2nd folding | turning roller 13d move to the outer side of a radial direction with the bead lock segment 12 in the state contact | abutted to the bead lock segment 12 (bead lock process).

Next, as shown in FIG. 5, the screw shaft 16 is rotated with respect to the nut 19, and the sliding body 21 is moved together with the bead lock segment 12 in the direction of the drum shaft O, so A high-pressure fluid is supplied into the main portion of the tire constituent member K while shortening the distance in the direction. Then, both sides of the main body bulge outward in the direction of the drum axis O, and the portion of the side located most outside in the direction of the drum axis O is positioned outside the bead B in the direction of the drum axis O. Thus, the main body is formed in a toroidal shape (bulging process).
Here, in this embodiment, prior to this bulging step, a high-pressure fluid is supplied to the outer chamber 22b of the first cylinder 22 and, as shown in FIG. Is moved inward in the direction of the drum axis O, and the bead B is supported from the outside in the direction of the drum axis O by the first folding roller 13c, and the bulging step is performed while maintaining this state.
Further, during the bulging step, the main band is formed in a toroidal shape by extrapolating the second band BT in which the belt and the tread, each formed in a cylindrical shape, are laminated in the radial direction to the tire constituent member K. When the bulge is performed, the radially outer end of the main body and the inner peripheral surface of the second band BT are brought into close contact with each other.

Next, as shown in FIG. 6, a high-pressure fluid is supplied to the inner chamber 31 a located on the inner side in the direction of the drum axis O among the two chambers 31 a and 31 b sandwiching the second piston 32 in the second cylinder chamber 31. Then, the outer cylinder part 34 is moved inward in the drum axis O direction with respect to the piston cylinder member 33, and the distance between the base end part 13a of the folding arm 13 and the inner end part of the second link 35 is shortened. As a result, the first folding roll 13c and the second folding roll 13d are rotated about the base end portion 13a so that the first folding roll 13d and the second folding roll 13d move outward in the radial direction. The high pressure fluid is alternately supplied to the outer chamber 22b and the inner chamber 22a, and the piston cylinder member 33, the outer cylinder portion 34, and the folding arm 13 are moved forward and backward in the direction of the drum axis O integrally.
Thereby, in tire constituent member K, both ends located on the outer side in the drum axis O direction with respect to bead B are folded back outward in the radial direction to form unvulcanized tire W (folding step).
Then, after pressing the outer surface of the unvulcanized tire W over the entire area using a pressing roller (not shown) as necessary, the unvulcanized tire W is vulcanized to form a product tire.

  As described above, according to the unvulcanized tire manufacturing apparatus 1 according to the present embodiment, the contacting / separating means 14 and the rotating means 15 can be driven independently of each other. The folding arm 13 is moved inward in the drum axis O direction by the contact / separation means 14 while rotating the folding arm 13 so that the first folding roller 13c and the second folding roller 13d move outward in the radial direction. In addition to this, it is possible to move the drum shaft O to the outside.

Therefore, the magnitude of the pressing force applied to the both end portions and the main portion of the tire constituent member K from the first folding roller 13c and the second folding roller 13d of the folding arm 13 is easily and reliably adjusted during the folding step. Therefore, various unvulcanized tires having different outer shapes can be formed with high accuracy.
Thereby, like this embodiment, at the time of the bulging process, the main part of the tire constituent member K is bulged and deformed in a toroidal shape in a cross-sectional view along the direction of the drum axis O, and then the folding arm 13 is moved in the folding process. When the both ends of the tire component member K are turned outward in the radial direction by rotating as described above, the turning arm 13 is moved back and forth in the direction of the drum axis O along the outer shape of the side portion of the main body. By doing so, it becomes possible to prevent the first folding roller 13c of the folding arm 13 from being caught on the side portion of the main portion, and the unvulcanized tire W is viewed in a cross-sectional view along the tire width direction, as in the case of the product tire. It can also be formed in a toroidal shape.

In the present embodiment, the contacting / separating means 14 is configured to move the folding arm 13 in the direction of the drum axis O by supplying the fluid to the first cylinder chamber 22 and moving the first piston 30, and rotating. Since the means 15 is configured to rotate the folding arm 13 by supplying a fluid to the second cylinder chamber 31 and moving the second piston 32, both the means 14 and 15 have a complicated structure. It can be reliably realized without increasing the weight or increasing the weight.
Furthermore, since the first cylinder chamber 22 and the second cylinder chamber 31 are independent from each other, the fluid pressures do not affect each other, so that the folding arm 13 can be operated easily and with high accuracy. can do.

In the present embodiment, since the bead B is supported from the outside in the direction of the drum axis O by the first folding roller 13c during the bulging step, the tire configuration is made while the pair of bead lock segments 12 are moved close to each other in the direction of the drum axis O. When the main portion of the member K is bulged and deformed in a toroidal shape, the bead B can be surely followed by the movement of the bead lock segment 12, and the unvulcanized tire W can be formed with high accuracy. it can.
In addition, such an effect is achieved by using the folding arm 13 without providing a dedicated means, and the complexity of the structure can be avoided.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the embodiment, during the bulging step, the main portion of the tire constituent member K bulged and deformed in a toroidal shape is brought into close contact with the inner peripheral surface of the second band BT, and then the folding step is performed. Instead of this, for example, the main body and the inner peripheral surface of the second band BT may be brought into close contact with each other after the folding step.
In the above embodiment, the main body is bulged and deformed in a toroidal shape by supplying a high-pressure fluid into the main body, but instead, for example, a drum disposed in the main body on the drum main shaft 11 is provided. The main body may be bulged and deformed in a toroidal shape by bulging and deforming the bladder, or a segment disposed in the main body may be disposed on the drum main shaft 11 to expand the segment. The main body may be bulged and deformed in a toroidal shape by moving the diameter.

Further, the contact / separation means 14 and the rotation means 15 are not limited to the above-described embodiment, and may be changed as appropriate. For example, a motor, a screw shaft rotatably supported by the motor, and a nut screwed to the screw shaft; Alternatively, a configuration including the second link 35 or the like may be employed.
Further, the second folding roll 13d and the bracket 13e may not be provided.
Further, at the time of the bulging step, the main body portion gradually extends linearly toward the outer side in the direction of the drum axis O as its both side portions move from the outer side in the tire radial direction toward the inner side. In this state, the portion positioned most outward in the direction of the drum axis O may be bulged and deformed so as to be a bead B, and then the folding process may be performed in this state.

Further, for example, an unvulcanized tire manufacturing apparatus 2 as shown in FIG. 7 may be employed instead of the embodiment.
In this device 2, the base end portion 13 a of the folding arm 13 is rotatably connected to the outer end portion of the piston cylinder member 33 in the direction of the drum axis O, and the inner end portion of the outer cylinder portion 34 in the direction of the drum axis O. The intermediate portion of the arm main body 13 b is connected via the second link 35. The second link 35 extends substantially along the drum axis O direction, the inner end portion in the drum axis O direction is connected to the outer cylinder portion 34, and the outer end portion in the drum axis O direction is the arm main body 13b. It is connected to. Further, the inner end portion of the second link 35 is located slightly inward in the radial direction from the outer end portion. Furthermore, the first piston 30 is located outside the second piston 32 in the drum axis O direction.
In the standby state of the unvulcanized tire manufacturing apparatus 2, a high-pressure fluid is supplied to the inner chamber 31 a of the second cylinder chamber 31 so that the folding arm 13 is positioned at the inner limit in the radial direction.
Even in this configuration, the same effects as those of the above-described embodiment can be obtained.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

  Various unvulcanized tires having different outer shapes can be formed with high accuracy.

DESCRIPTION OF SYMBOLS 1, 2 Manufacturing apparatus of unvulcanized tire 11 Drum main shaft 12 Bead lock segment 13 Folding arm 13a Base end part 13c First turning roll (tip part)
13d Second folding roll (tip)
14 Contact / Separation Means 15 Rotation Means 22 First Cylinder Chamber 23 Inner Cylinder 30 First Piston 31 Second Cylinder Chamber 32 Second Piston 33 Piston Cylinder Member 34 Outer Cylinder 35 Second Link (Link)
B Bead K Tire component O Drum shaft

Claims (3)

The drum spindle,
A pair of bead lock segments arranged in a circumferential direction on the outer peripheral side of the drum main shaft and supported so as to be movable in the radial direction;
A plurality of circumferentially arranged drums are arranged on the outer peripheral side of the drum main shaft along the drum shaft direction, and the base end portions of the drum main shaft are separated from the pair of bead lock segments on the outer peripheral side of the drum main shaft. A folding arm rotatably connected to each of the parts separated outward in the drum axis direction,
Contact / separation means for moving the folding arm in the drum axial direction to approach and separate each other;
An unvulcanized tire manufacturing apparatus comprising: a turning means for turning the folding arm around its base end and moving the tip in the radial direction;
The contact / separation means and the rotation means can be driven independently of each other ,
The contact / separation means includes a first piston movably disposed in the first cylinder chamber, and moves the folding arm in the drum axis direction by supplying fluid to the first cylinder chamber and moving the first piston. Let
The rotating means includes a second piston movably disposed in the second cylinder chamber, and supplies the fluid to the second cylinder chamber to move the second piston to rotate the folding arm.
The first cylinder chamber and the second cylinder chamber are independent spaces,
On the outer peripheral side of the drum main shaft, an inner cylinder part having the first cylinder chamber formed on the outer peripheral surface, and an outer cylinder slidably fitted in the drum axial direction, and the inner cylinder part having the first cylinder chamber on the inner peripheral surface. A piston cylinder member in which one piston protrudes and the second piston protrudes on the outer peripheral surface; and the piston cylinder member is fitted on the piston cylinder member so as to be slidable in the drum axis direction, and the second cylinder on the inner peripheral surface An outer cylinder portion formed with a chamber,
A base end portion of the folding arm is connected to one of the piston cylinder member and the outer cylinder portion, and the other and an intermediate portion of the folding arm are connected via a link.
A screw shaft rotatably supported around the drum shaft is disposed in the drum main shaft. Outer peripheral surfaces of the screw shaft are arranged on both side portions located on both sides of the central portion along the drum shaft direction. Are formed with male screw parts whose screwing directions are opposite to each other,
An unvulcanized tire manufacturing apparatus , wherein a nut to which the inner cylinder portion is connected is screwed to each male screw portion . Extrapolate a cylindrical tire component to the drum spindle and an annular bead to the tire component, then move the bead lock segment outward in the radial direction to bring the bead and tire component into close contact A bead lock process,
A bulging step of bulging and deforming the main body portion located on the inner side in the drum axial direction than the bead in the tire constituent member while moving the pair of bead lock segments closer to each other in the drum axial direction;
While moving the folding arm in the drum axial direction, the tip end portion is moved outward in the radial direction so that both end portions of the tire constituent member located outside the drum axial direction are folded outward in the radial direction. A folding step of forming an unvulcanized tire, and a method for producing an unvulcanized tire,
An unvulcanized tire is formed using the unvulcanized tire manufacturing apparatus according to claim 1 . It is a manufacturing method of the unvulcanized tire according to claim 2 ,
The bulging step bulges the main portion of the tire constituent member while moving the pair of bead lock segments close to each other in the drum axis direction with the bead supported from the outer side in the drum axis direction by the tip of the folding arm. A method for producing an unvulcanized tire, wherein the tire is deformed.

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