JP4450668B2 - Carcass band folding device - Google Patents

Description

  The present invention relates to a carcass band folding device that folds a carcass band side portion around a bead core along a substantially semicircular carcass band central portion on a tire molding drum.

Conventionally, a plurality of folding arms that are arranged side by side in the circumferential direction of the tire molding drum and that are swingable inward and outward in the radial direction around a base end portion located on the outer side in the axial direction of a pair of bead lock means. Each folding roller rotatably supported at the tip of the folding arm, arm moving means for reciprocating the folding arms together in the axial direction, and bundling the folding arms together in the radial direction A cylindrical carcass band side portion located on the outer side in the tire axial direction of each bead core supported by the bead lock means by swinging the folding arm radially outward. The carcass band folds back around the bead core along the center of the carcass band that swells in a semicircular shape between the bead cores. Are returned device known (e.g., refer to patent document 1.), According to the folding apparatus, it is possible to highly accurately folding the side portion of the carcass band.
JP 2003-80612 A

  However, in such a conventional folding device, the elastic band generates a force that swings the folding arm radially inward, so the more the folding arm swings radially outward, the more elastic band The force that stretches and swings the folding arm inward in the radial direction becomes strong, and as a result, the folding roller attached to the tip of the folding arm is pressed against the side of the carcass band. If the elastic band force is increased to obtain the pressing force required for turning the carcass band at the radially inner position, the pressing force increases at the radially outer position. Appropriate pressing force that does not leave roller streaks on the outer side in the radial direction. So as, when adjusting the intensity of the elastic band is a radially inner position, there is a problem that no longer Orikaese the carcass band.

  The present invention has been made in view of such problems, and provides a carcass band folding device capable of reliably folding back a carcass band side portion without leaving a streak on the folded carcass band side portion. The porpose is to do.

<1> The present invention is arranged in a row in the circumferential direction of the tire molding drum, and is provided in plural so as to be able to swing inward and outward in the radial direction around a base end portion positioned on the outer side in the axial direction of a pair of bead lock means. The folding arms of the books, the respective folding rollers rotatably supported at the tip of the folding arms, the arm moving means for collectively reciprocating the folding arms in the axial direction, and bundling the folding arms A cylindrical carcass band positioned on the outer side in the tire axial direction of each bead core supported by the bead lock means by swinging the folding arm radially outward. A carcass bar that folds the side part around the bead core along the center part of the carcass band that swells in a semicircular shape between the bead cores. In de loop-back,
An arm diameter reducing means for bundling these folded arms and swinging them radially inward is provided, and the arm diameter reducing means rolls on the radially outer surface of the folded arm and is relative to the folded arm in the axial direction. Each presser roller that is displaced, and each presser arm that is pivotally supported in the radial direction around the base end located axially outside the front end, with the presser rollers pivotally supported at the front end And an elastic band for bundling those presser arms and swinging them inward in the radial direction, and a carcass band folding device in which the center of swinging of these presser arms is fixed to the support portion of the arm moving means .

  <2> In the present invention, in <1>, the respective folding arms are configured to face outward in the axial direction at positions outside the base end in the axial direction under displacement to the outermost position in the axial direction. A protrusion is provided, and a stopper member having a surface facing the radially inner surface of the protrusion under the displacement of the folding arm to the outermost position is provided, and the stopper member is formed by the rotation of the tire molding drum. It is the carcass band folding device comprised so that the displacement to the radial inside may be suppressed.

  <3> The present invention is the carcass band folding device according to <2>, wherein the stopper member is provided with a surface that contacts the axially outer surface of the projection under the displacement of the folding arm to the outermost position. It is.

  <4> In the present invention, in any one of <1> to <3>, two folding rollers supported by the tip of each folding arm are provided via a swinging member, and the swinging member is folded The center part in the length direction pivotally supported by the tip of the arm is provided so as to be able to swing in and out of the radial direction of the forming drum. These folding rollers are respectively provided at both ends in the length direction of the swinging member. It is a carcass band folding device in which a rotating shaft is arranged in the circumferential direction of the molding drum.

  <5> In the present invention, in <4>, the folding rollers supported at both ends in the length direction of the swinging member are supported by the roller support portions of the swinging member in the circumferential direction of the molding drum. The two divided parts are arranged on both sides, and one of the divided parts is provided so as to protrude from the swinging member in the circumferential direction of the molding drum, and the protruding directions thereof are opposite to each other by the folding rollers. The forming drum circumferential direction extending angle range of the roller supporting portion that supports the folding roller is configured to be included in the molding drum circumferential direction extending angle range of the other divided part of the other folding roller. This is a carcass band folding device.

According to the invention of <1>, the arm diameter reducing means for bundling the folded arms and swinging them radially inward is provided, and the arm diameter reducing means rolls on the radially outer surface of the folded arm. Each presser roller that is relatively displaced in the axial direction with respect to the return arm, and these presser rollers are pivotally supported at the tip, and swing inward and outward in the radial direction around the base end located axially outside the tip. Each presser arm is provided with an elastic band that binds the presser arms and swings them inward in the radial direction. The center of swinging of the presser arms is fixed to the support part of the arm moving means. So
In the folding operation, in the state where the folding arm is located radially inward, the folding arm is located axially outside.For this reason, the point that the press roller applies a swinging force inward in the radial direction to the folding arm is When the folding arm is located farther from the center of swinging of the folding arm, while the folding arm is positioned radially outward, the folding arm is positioned axially inside. The point where the inward swinging force is applied is located on the side closer to the swinging center of the folding arm, which is due to the elastic band that swings the folding arm directly as the folding arm opens radially outward. While the rotational moment increases, on the other hand, the rotational moment due to the arm diameter reducing means acting on the return arm via the presser roller decreases, and the folding moment decreases. The swinging force inward in the radial direction acting on the arm changes in proportion to the sum of these moments, so that it remains constant without being greatly affected by the radial position of the folding arm, and the folding roller on the carcass band. This can be reliably folded without leaving any streak.

  In particular, when the side portion of the carcass band in which the side wall member is extended further outward from both ends in the width direction of the carcass member is folded back, the side wall member is folded back while pressing the surface with a folding roller. The wall member is more likely to leave the mark of the folding roller than the carcass member, and in this respect, the present invention can provide a greater effect in the application of folding the side portion of the carcass band with the sidewall member.

According to the invention of <2>, in addition to the configuration of <1>, each folded arm is axially displaced at a position on the axially outer side of the base end portion under displacement to the axially outermost position thereof. Since a protrusion having a posture facing outward is disposed, and a stopper member having a surface facing the radially inner surface of the protrusion under the displacement of the folding arm to the outermost position,
The action of these protrusions and the stopper member prevents the folding arm located at the outermost position in the axial direction from opening due to centrifugal force even when the tire molding drum is rotated at a high speed for crimping the carcass band. This makes it possible to adjust the force of the elastic band without considering the function of preventing the folding arm from being opened due to centrifugal force, and the side of the carcass band that does not leave the mark of the folding roller. The folding of the part can be realized more reliably.

  According to the invention of <3>, the displacement of the protrusion can be regulated by the stopper member on both the radially inner surface and the axially outer surface under the displacement of the folding arm to the outermost position. Since it comprised in this, it can suppress more reliably the jumping-out | jump to the radial direction outer side of the folding | turning arm under high speed rotation of a tire shaping | molding drum.

  According to the invention of <4>, the folding rollers pivotally supported at both ends in the longitudinal direction of the swinging member that is swingably connected to the tip of the folding arm are brought into rolling contact with the side portion of the carcass band. Since it can be folded back, the swinging force by the elastic band can be converted into a uniform pressing force to the central part of the carcass band, and the crimping of the side part of the carcass band to the central part of the carcass band can be made uniform.

  According to the invention <5>, according to the tire molding drum, the folding rollers attached to both ends in the length direction of one swing member are provided so as to protrude from the swing member to the opposite sides in the circumferential direction. That is, these rollers are attached to the folding arms in steps, so that even if the diameter of the tip of the folding arm is reduced and the interval between the adjacent tips is narrowed, one of the rollers protruding between the neighboring folding arms The roller of the folding arm and the roller of the other folding arm do not interfere with each other, so that when the folding arms are arranged densely in the circumferential direction and the tip of the folding arm is expanded in diameter, a pair is formed. The side of the carcass band that is not crimped by any of the folding rollers formed can be eliminated, and the contact between the center of the carcass band and the side of the carcass band can be eliminated. It is possible to further strengthen.

  In addition, each folding roller attached to both ends of the swinging member is divided into two on both sides of the roller support part of the swinging member that supports these rollers. Thus, the side portion of the carcass band stretched outward in the radial direction comes into contact with the non-rotating support portion, thereby preventing the phenomenon of damaging the side portion of the carcass band.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view schematically showing a half portion including a central axis of a tire molding drum on which a carcass band folding device according to an embodiment of the present invention is mounted.

  The tire molding drum 1 is provided with a pair of sleeves 3 that are spaced apart from each other in the axial direction on the central axis 2 and are displaced toward each other. The carcass band folding device 10 according to the present invention is fixed on the outer periphery of each slider 4 together with the bead lock means 7 for fixing and supporting the bead core. Provided.

  The bead lock means 7 includes a plurality of bead lock segments 71 adjacent to each other in the circumferential direction, expanding and contracting in an annular shape, each link 72 having one end hinged to these bead lock segments 71, and the other end of each link 72 And a bead lock piston 73 that is axially displaceable, and a bead lock cylinder 74 that is fixed on the outer periphery of the sleeve 3 and that displaces the bead lock piston 73. In order to increase the diameter of the bead lock segment 71, the bead lock piston 73 is displaced inward in the axial direction, and the end portion of the link 72 on the bead lock segment 71 side is increased in diameter.

  One core body 60 that is radially expanded and contracted is arranged in the center in the axial direction between the two bead lock means 7, and this core body 60 is engaged with each other by a comb tooth portion to form a ring-shaped rigidity. A plurality of support members 60a are configured, and one end portion of a link mechanism 61 including a pair of links 61a in which intermediate portions are hinge-connected to each rigid support member 60a, and the other end portion of the link mechanism 61 is connected to each other. It attaches to each sleeve 3 which makes a pair, and the means (not shown) which reciprocates this in the axial direction is attached to the sleeve 3.

  The molding drum 1 also includes a center bladder 9 made of a reinforced rubber film that extends outward in the radial direction of the core body 60, seals the space around the core body 60, and expands and contracts in a toroidal shape. The both sides in the axial direction of the center bladder 9 are fixed to the inner end in the axial direction of the slider 4 at a position close to the inner side in the axial direction of the bead lock means 7. With this configuration, both side portions of the center bladder 9 in the axial direction, the bead lock means 7 on the same side in the axial direction, and the carcass band folding device 10 on the same side in the axial direction are integrally separated and moved closer together.

  FIG. 1A shows a state in which the diameter of the pair of bead lock means 7 and the core body 60 is increased and these bead lock means 7 are displaced in proximity, and FIG. 1B shows the bead lock means 7. The core body 60 is reduced in diameter, and the bead lock means 7 is separated and displaced.

  In order to displace the pair of bead lock means 7 in proximity to each other, the respective sliders 4 are displaced in proximity to each other. Further, in order to displace the diameter of the bead lock segment 71, the bead lock piston 73 is displaced inward in the axial direction, and the end portion of the link 72 on the bead lock segment 71 side is expanded.

  Here, the means for moving the respective sliders 4 inward and outward in the axial direction so as to move away from each other is a female screw member 41 coupled to the respective sliders 4 via a coupling member 42 on the inside in the radial direction thereof, A screw shaft 50 having left and right male screw portions 51 which are provided in hollow portions in the central shaft 2 and screwed into the respective female screw members 41, and screw shaft rotating means (not shown) for rotating the screw shaft 50. ), And the direction of the lead of the male threaded portion 51 of the screw shaft 50 is opposite to each other on the left and right. With this configuration, by rotating the screw shaft 50 by the screw shaft rotating means, the female screw member 41 is displaced in a laterally symmetrical manner so as to be separated and approached, so that the pair of bead lock means 7 mounted on the slider 4 is accurately positioned. It can be moved away from each other. The central shaft 2 and the sleeve 3 are provided with through-holes 2a and 3a that allow the connecting member 42 to pass therethrough.

  2 and 3 are partial cross-sectional views showing the carcass band folding apparatus 10 in a cross section including the central axis of the tire molding drum. 2A shows a state before the folding arm is positioned at the outermost end in the axial direction, FIG. 3A shows a state in the middle of folding, and FIG. FIG. 2B shows the state of the final folded state located at the innermost end in the direction. FIG. 2B is an enlarged view of the engagement portion between the projection of the folded arm and the stopper member in FIG. FIG. 2 (a), 3 (a), and 3 (b) all show only about a quarter portion of the tire molding drum.

  The carcass band folding device 10 includes a folding arm 11 provided so as to be able to swing inward and outward in the radial direction around the base end portion 17, and the folding arm 11 is arranged in the tire molding drum circumferential direction, for example, at regular intervals. Is done.

  Further, the carcass band folding device 10 includes a folding roller 14 rotatably supported at the tip of each folding arm 11, arm moving means 30 for reciprocally displacing each of the folding arms 11 in the axial direction, and these Are provided with an elastic band 15 for bundling the folding arms 11 and swinging inward in the radial direction of the forming drum, and arm diameter reducing means 20, and supported by the bead lock means 7 by swinging the folding arms 11 radially outward. In addition, the cylindrical carcass band side portion CBS located on the outer side in the tire axial direction of each bead core B is aligned with the bead core B along the carcass band center portion CBC bulged between the bead cores B in a substantially semicircular shape. Configured to wrap around.

  The arm moving means 30 includes a cylinder base 32 fixed on the circumference of the slider 4, a first sliding wall 33 and a second sliding wall 34 that slide on the outer circumference of the cylinder base 32, and these sliding walls. And a fixed partition wall 31 fixedly provided on the outer periphery of the cylinder base 32. The fixed wall 31, the first sliding wall 33, and the cylindrical wall 37 are provided. Forms the first pressure chamber 36a, and the fixed wall 31, the second sliding wall 34, and the cylindrical wall 37 similarly form the second pressure chamber 36b.

  The fixed wall 31, the first sliding wall 33, and the second sliding wall 34 are formed in an annular shape around the center axis of the tire molding drum, and in the figure, reference numerals 35a and 35b denote the first pressure chamber 36a. , Air holes for taking pressurized air into and out of the second pressure chamber 36b.

  Each of the base end portions 17 of the folding arm 11 is fixed to the first sliding wall 33 and supplies air from the air hole 35a to the first pressure chamber 36a, and at the same time from the air hole 35b to the second pressure. By exhausting the air in the chamber 36b, the first sliding wall 33 can be pressurized outward in the axial direction, and the folding arm 11 can be displaced outward in the axial direction. Simultaneously with the supply to the pressure chamber 36b, the air in the first pressure chamber 36a is exhausted from the air hole 35a to pressurize the second sliding wall 34 in the axial direction and displace the folding arm 11 in the axial direction. Can be made.

  The arm diameter-reducing means 20 rolls on the radially outer surface 11a of the folded arms 11 to thereby respectively press the pressing rollers 5 that are displaced in the axial direction relative to the folded arms 11 and the pressers thereof. Each presser arm 6 that is supported by a roller 5 at its front end and that can swing inward and outward in the radial direction around a base end 8 positioned axially outside the front end, and the presser arms 6 The base end 8 serving as the center of swinging of the presser arm 6 is formed on the outer side in the axial direction of the cylinder base 32 serving as a support portion of the arm moving means 30. It is attached to a fixing member 27 fixed to the end.

  The elastic band 26 for reducing the diameter of the presser arm 6 and the elastic band 15 for reducing the diameter of the folding arm 11 are each one or more elastomer members such as rubber, which are annularly arranged around the center axis of the forming drum. Or it can comprise with a spring.

  The folding arm 11 generates a rotational moment inward in the radial direction by the force from both the elastic band 15 and the arm diameter reducing means 20, and this rotational moment passes through the folding roller 14 attached to the tip of the folding arm 11. Thus, a pressing force is applied to the carcass band side portion CBS. The magnitude of the pressing force is proportional to the total of these rotational moments because the arm length of the folding arm 11 is constant.

And the total M of rotational moments can be expressed by equation (1) as shown in FIG.

M = M ₁ + M ₂ (1)
However,
M ₁ = F1xd ₁ (2)
M ₂ = F2xd ₂ (3)
F ₁ : acting force of the elastic band 15 toward the inner side in the radial direction to the folding arm 11 d ₁ : axial distance from the base end portion 17 to the acting point of the elastic band 15 F ₂ : folding arm 11 of the presser roller 5 Radially inwardly acting force d _{2 on} the axis d ₂ : axial distance from the base end 17 to the point of action of the presser roller 5

The folding arm 11 passes from the position of the outermost end in the axial direction shown in FIG. 2A to the position of the innermost end in the axial direction shown in FIG. 3B through the position shown in FIG. In the process of displacing, the folding roller 14 is displaced radially outward along the carcass band central portion CBC, so that although d ₁ is slightly decreased, F ₁ is increased more than that, and as a result, M ₁ is On the other hand, while F ₂ slightly increases, d ₂ decreases greatly with the axially inward displacement of the folding arm 11, and as a result, M ₂ decreases conversely. In this way, M ₂ acts to suppress an increase in the pressing force to the carcass band side portion CBS due to the displacement of the folding arm 11 in the axial direction, and the rotational moment M obtained by adding M ₁ and M ₂ together. Can suppress the influence of the position of the folding arm 11 in the axial direction, and can be brought close to a constant one, so that the streak of the folding roller does not remain on the carcass band side portion CBS, and the reliable folding can be performed. Can be possible.

  In addition, the respective folding arms 11 are displaced outwardly in the axial direction at a position outside the axial direction of the base end portion 17 in the state shown in FIG. A stopper member 13 having a surface facing the radially inner surface of the projection 12 under the displacement of the folding arm 11 to the outermost position is disposed on the fixing member 27. It is attached.

  That is, the surface 13 a is provided on the stopper member 13 as a surface facing the surface 12 a facing the radially inner side of the protrusion 12. In addition to these pairs of surfaces, the projection 12 is provided with a surface 12b facing outward in the axial direction under displacement of the folding arm 11 to the axially outermost position, and the stopper member 13 is provided with this surface 12b. An abutting surface 13b is provided.

  When the tire molding drum 1 is rotated at a high speed for member crimping or the like, each folding arm 11 has an elastic band 15 and an arm diameter reducing means 20 by a centrifugal force acting on a folding roller 14 provided at the tip of the folding arm 11. The surface 13a of the stopper member 13 is arranged to face the surface 12a of the protrusion 12 against the problem of opening to the outside in the radial direction against the force inwardly in the radial direction and causing interference with other devices. This suppresses the displacement of the protrusion 12 that moves inward in the radial direction when the folding arm 11 is opened, thus preventing the folding arm 11 from opening outward in the radial direction. The contact with the surface 13b of the stopper member 13 can ensure this suppression. Further, when the folding arm 11 is separated from the outermost position in the axial direction, the stopper member 13 does not face the protrusion, so that it can be opened radially outward, and the carcass band folding device 10 can perform the intended folding. Can be operated.

  In the carcass band folding device 10 configured as described above, when the folding arm 11 is displaced to the axially outermost position, the tip of the folding arm 21 is in a reduced diameter state, and the folding roller 14 becomes a groove. Although it is stationary on the roller arrangement part 16 extending in the circumferential direction, when the folding arm 11 is displaced inward in the axial direction by the arm moving means 30, the folding roller 14 has a radius along the inclined surface of the roller arrangement part 16. When the carcass band central portion CBC bulges out in the direction outward, it further moves outward in the radial direction along the carcass band outer contour line beyond the inclined surface.

  At this time, the radially inward force by the elastic band 15 and the arm diameter reducing means 20 acts on the folding arm 11, and by this force, the folding roller 14 pushes the carcass band side portion CBS and pushes it inward in the radial direction. It can be crimped to the band center portion CBC.

  4 and 5 are cross-sectional views of a tire in the middle of molding, illustrating a process of molding a green tire using the carcass band folding device 10. First, as shown in FIG. 4A, a preset bead PB in which a bead core B and a bead filler member F are preset, and a carcass member C with an inner liner member IL, a sidewall member S, and a canvas chafer member CF. A carcass band CB having a generally cylindrical shape, on which members such as the above are assembled, is disposed on the outer peripheral side of the tire molding drum 1.

  Next, as shown in FIG. 4 (b), the bead lock segment 71 of the bead lock means 7 is forwardly displaced by the bead lock piston 37 shown in FIG. As shown in FIG. 4C, the left and right bead cores B are locked by the corresponding bead lock segments 71 while being displaced in proximity by the action of the slider 4 shown in FIG. The space sealed in the center bladder 9 is pressurized to bulge the central portion CBC of the carcass band CB extending between the bead cores B in a toroidal shape.

  Next, as shown in FIG. 5A, the side surface of the rigid support member 60a is expanded and displaced to a height corresponding to the radial direction position of the bead core B, and this is held at that position. By actuating, the base end portion 17 of the folding arm 11 is displaced inward in the axial direction, and the folding of the carcass band side portion CBS including the sidewall member S is started.

  Subsequently, as shown in FIG. 5B, the folding roller 14 is displaced radially outward along the outer contour line of the carcass band central portion CBC, and the folding of the carcass band side portion CBS is completed. When the carcass band side portion CBS is folded by the folding roller 14, the rigid support member 60a is always folded so that the side surface of the rigid support member 60a faces each other according to the radial position of the folding roller 14 whose diameter is increased. It is preferable to carry out the diameter expansion displacement in synchronism with the diameter expansion of 14, so that the crimping of the carcass band side part CBS to the carcass band center part CBC can be ensured.

  Next, after the folding roller 14 is originally displaced radially inward, as shown in FIG. 5 (c), the member pressing roller 38 whose surface is knurled while rotating the molding drum 1, The vicinity of the folded end of the carcass band side portion CBS including the wall member S is crimped.

  Although the subsequent steps are not shown in the drawings, the rigid support member 60a is further expanded to the maximum diameter, and a belt member, a tread member, a rubber chafer member, etc. are pasted on the outside of the carcass band CB using the rigid support member 60a as a support. After the tire is completed, the diameter of the rigid support member 60a is reduced, the green tire is taken out from the molding drum 1 and delivered to the next process, and the process ends.

  In the above description, the side wall member S is folded after being assembled as a part of the carcass band CB. However, the side wall member S is not part of the carcass band CB, but is turned back. It can also be assembled to the outside in the axial direction of the side part CBS.

  The carcass band folding device 10 described above has a configuration in which one folding roller 14 is provided at the tip of each folding arm 11, but a modification in which only this tip is replaced with another one will be described. FIG. 6 is a front view showing details of the distal end portion of the folding arm 21 of the carcass band folding apparatus 10A of this modified example, and FIG. 7 is a diagram of the expansion / contraction mode of the folding arm 21 as seen from the axial direction. In FIG. 6, the solid line indicates a state in which the tip of the folded arm 21 is reduced in diameter, and the two-dot chain line indicates a state in which the diameter of the folded arm 21 is expanded to an intermediate diameter, and in FIG. The two-dot chain line indicates a state where the diameter is reduced. In FIG. 7, the illustration of the arm diameter reducing means 20 is omitted.

  In the carcass band folding device 10 </ b> A, a swinging member 22 that swings in the radial direction around the central portion in the length direction is attached to the distal end portion of the folding arm 21 via a swinging pin 25. Folding rollers 23 and 24 that rotate around respective axes provided in parallel with the swing pin 25 are attached to both ends in the length direction of 22. The folding rollers 23 and 24 attached to the swinging member 22 of each folding arm 21 are arranged back and forth in the length direction, that is, in the radial direction or the axial direction of the tire molding drum 1, and the swinging member 22. These rollers 23 and 24 are opposite to each other in the protruding direction.

  Each of the rollers 23 and 24 is divided into two parts on both sides of the portions 22a and 22b of the swinging member 22 supporting these roller shafts. The roller 23 is divided into a protruding roller 23a and a non-projecting roller 23b. The roller 24 is divided into a projecting side roller 24a and a non-projecting side roller 24b. At this time, the circumferential extension angle range of each roller rotating shaft support portion 22a or 22b corresponding to one folding roller 24 or 23 is located within the circumferential angle range of the other folding roller 23 or 24. .

  In this carcass band folding apparatus 10A, the swinging member 22 is provided at the tip of the folding arm 21. Therefore, the carcass band pressing force applied to the tip of the folding arm 21 is caused by the action of the swinging member 22 to Regardless of the outer contour shape of the central portion and the position on the outer contour, it is evenly distributed to the respective folding rollers 23 and 24, and uniform and smooth folding can be realized.

  In addition, since these rollers 23 and 24 are attached in steps on both sides in the circumferential direction of the folding arm 21, even if the distal end portion of the folding arm 21 is reduced in diameter and the interval between the adjacent distal end portions is narrowed, The roller 23 of one arm 21 and the roller 24 of the other arm 21 projecting between the adjacent arms 21 do not interfere with each other, and the distance between the adjacent arms 21 can be minimized. In the state where the arms 21 are densely arranged in the circumferential direction and the tip portion of the arm 21 is expanded in diameter, it is possible to eliminate the carcass band side CBS portion which is not pressure-bonded by any of the rollers 23 and 24. The adhesion between the carcass band center part CBC and the carcass band side part CBS can be strengthened.

  Each of the rollers 23 and 24 is divided into two on both sides of the portions 22a and 22b of the swinging member 22 that support these roller shafts. This is because the rollers 23 and 24 are supported by the support portion 22a. , 22b, the portion of the carcass band side portion CBS stretched radially outward between the adjacent folding arms 21 in the middle of the folding is a supporting portion 22a that does not rotate. It is possible to prevent a problem that there is a risk of damaging the carcass band side portion CBS by abutting against the carcass band.

  At this time, the circumferentially extending region of each roller rotating shaft support portion 22a or 22b corresponding to one folding roller 24 or 23 is positioned within the circumferentially extending region of the other folding roller 23 or 24. Therefore, it is possible to prevent the portion of the carcass band side portion CBS that is not pressure-bonded by any of the rollers 24 and 23 from remaining.

  In the above description, the carcass band folding device 10 has been described as being mounted on the tire molding drum 1 having one core body 60 and positioned in the center in the axial direction, but this can be moved away from each other in the axial direction. It can be similarly mounted on a tire molding drum having a pair of core bodies provided, and similar effects can be achieved.

  FIG. 8 is a cross-sectional view showing a tire molding drum having a pair of core bodies that are spaced apart from each other in the axial direction in correspondence with FIG. 1, and the same reference numerals are given to the same parts as in FIG. 1. FIG. 7A shows a state in which the diameter of the pair of bead lock means 7 and the core body 60B is increased and these bead lock means 7 are displaced in proximity, and FIG. 1B shows the bead lock means 7. In addition, the diameter of the core body 60B is reduced, and the bead lock means 7 and the core body 60B are separated and displaced in the axial direction.

  Also in this tire molding drum, the pair of bead lock means 7 and the pair of carcass band folding means 10 are mounted on the slider 4 so as to be spaced apart from each other in the axial direction of the molding drum. This is the same as that shown in FIG.

  1 differs from that shown in FIG. 1 in that the core bodies 60B form a pair, and the pair of core bodies 60B are mounted on the slider 4 so as to be spaced apart from each other in the axial direction and arranged in a ring in the circumferential direction. The plurality of rigid body segments 60C are configured so that the segment expansion / contraction mechanism 63 displaces each rigid body segment 60C through the link 62 along the guides 65A and 65B. In this embodiment, the green tires having different widths can be molded without replacing the core body 60B by moving the pair of core bodies 60B apart from each other.

  The present invention can be used in a tire molding apparatus that turns a carcass band around a circumference.

It is sectional drawing which shows the tire shaping | molding drum carrying the carcass band folding | turning apparatus of embodiment which concerns on this invention. It is a fragmentary sectional view which shows a carcass band folding | turning apparatus in the cross section containing the center axis line of a tire molding drum. It is a fragmentary sectional view which shows the carcass band folding | turning apparatus in a different state from FIG. 2 in the cross section containing the central axis of a tire molding drum. It is sectional drawing of the tire in the middle of molding which illustrates the molding process of a tire. It is sectional drawing of the tire in the middle of a shaping | molding explaining the shaping | molding process following FIG. It is a front view which shows the detail of the front-end | tip part of the folding | turning arm in the carcass band folding | turning apparatus of a modification. It is the figure which looked at the expansion / contraction aspect of the folding | turning arm in the carcass band folding | turning apparatus of the modification from the axial direction. It is sectional drawing which shows the tire molding drum of the other aspect which mounts the carcass band folding | turning apparatus of this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tire molding drum 2 Center shaft 2a Through long hole 3 Sleeve 3a Through long hole 4 Slider 5 Pressing roller 6 Pressing arm 7 Bead lock means 8 Base end part of pressing arm 9 Center bladder 10, 10A Carcass band folding device 10a
DESCRIPTION OF SYMBOLS 11 Folding arm 11a Radial outer side surface of folding arm 12 Projection 12a, 12b Projection surface 13 Stopper member 13a, 13b Stopper member surface 14 Folding roller 15 Elastic band 16 Roller arrangement part 17 Folding arm base end part 20 Arm diameter reduction Means 21 Folding arm 22 Swing member 23, 24 Folding roller 25 Oscillating shaft 26 Elastic band 27 Fixed member 30 Arm moving means 31 Fixed wall 32 Cylinder base 33 First sliding wall 34 Second sliding wall 35a, 35b Air hole 36a First pressure chamber 36b Second pressure chamber 37 Cylindrical wall 38 Member pressure roller 41 Female screw member 50 Screw shaft 51 Male screw portion 60, 60A Core body 60a, 60C Rigid segment 61 Link mechanism 61a Link 62 Link 63 Segment expansion / contraction mechanism 65A , 65B Guide 1 bead lock segment 72 links 73 bead lock pistons 74 bead lock cylinder B bead CB carcass band CBC carcass band center portion CBS carcass band side portions

Claims (5)

A plurality of folded arms arranged side by side in the circumferential direction of the tire molding drum and provided so as to be able to swing inward and outward in the radial direction around a base end portion positioned on the axially outer side of the pair of bead lock means; and Each folding roller rotatably supported at the tip of the folding arm, arm moving means for reciprocating the folding arms together in the axial direction, and bundling the folding arms together to swing inward in the radial direction The side portions of the cylindrical carcass band positioned on the outer side in the tire axial direction of the bead cores supported by the bead lock means by the swinging of the folding arms outward in the radial direction. Carcass band folding device that folds around the bead core along the center of the carcass band bulging in a substantially semicircular shape between Oite,
Arm diameter reducing means for bundling these folded arms and swinging them radially inward is provided, and the arm diameter reducing means rolls on the radially outer surface of the folded arm and is relative to the folded arm in the axial direction. Each presser roller that is displaced, and each presser arm that is pivotally supported in the radial direction around the base end located axially outside the front end, with the presser rollers pivotally supported at the front end And an elastic band for bundling these presser arms and swinging them inward in the radial direction, and a swing center of the presser arm fixed to a support portion of the arm moving means.   Each of the folding arms is provided with a projection that is in an axially outward position at a position on the outer side in the axial direction of the base end portion under the displacement to the outermost position in the axial direction. A stopper member having a surface facing the radially inner surface of the protrusion under displacement to the outer position is provided, and the stopper member is configured to suppress the displacement of the protrusion inward in the radial direction due to rotation of the tire molding drum. The carcass band folding device according to claim 1.   The carcass band folding device according to claim 2, wherein the stopper member is provided with a surface that comes into contact with an axially outer surface of the projection under the displacement of the folding arm to the outermost position.   Two folding rollers supported by the tip of each folding arm are provided via a swinging member, and the swinging member has a central portion in the length direction pivotally supported by the tip of the folding arm as a swing center. 4. The swing roller is provided so as to be capable of swinging in and out of the molding drum in the radial direction, and the turning rollers are arranged at both ends in the length direction of the swinging member with their respective rotation shafts directed in the circumferential direction of the molding drum. The carcass band folding device according to any one of the above.   The folding rollers supported at both ends in the longitudinal direction of the swinging member are arranged in two divided on both sides in the circumferential direction of the molding drum by the respective roller support portions of the swinging member that support them. One of the divided parts is provided so as to protrude from the swinging member in the circumferential direction of the molding drum, and the protruding direction of those rollers is reversed by the folding rollers, and the molding of the roller support portion that supports one folding roller The carcass band folding | turning apparatus of Claim 4 comprised so that the drum circumferential direction extension angle range may be contained in the shaping | molding drum circumferential direction extension angle range of the other part into which the other folding | turning roller was divided into two.

Images