JP2009154471A - Method for manufacturing pneumatic tire and machine for molding green tire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a pneumatic tire and a machine for molding a green tire improving a winding up step of a tire member. <P>SOLUTION: The tire is manufactured using a green tire molding machine including a molding drum 2 and an attaching devices in both sides of the molding drum 2. The attaching devices includes slide members 7 movable in an axial direction of the molding drum 2 and a swing arms 8 in which rollers 8B are turnably pivoted to one ends of arm bodies 8A. The tire member is wound in a cylindrical shape over the molding drum 2 and swing arm 8, a pair of bead cores are fitted to the tire member, the body portion 20 is molded by expanding the tire member between the bead cores, and the slide member 7 is moved to the molding drum 2 in an axial direction while providing relative rotation between the body portion 20 and the slide member 7. Thus, protruded portions are wound up by moving rollers 8B contacting with the protruded portions 21 of the tire member from inside to outside of a radial direction and obliquely to a radial direction along the tire body 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a pneumatic tire and a raw tire molding apparatus that can reduce defective sticking by improving a winding process of a tire member at the time of green tire molding.

  In a general pneumatic tire manufacturing process, first, after a tire member including a carcass ply is wound around a molding drum in a cylindrical shape, a pair of bead cores are fitted, and the tire member between the bead cores is inflated and deformed in a toroidal shape. The protruding portion of the tire member outside the bead core in the tire axial direction is wound around the bead core to form a raw tire (sometimes referred to as “low cover” or “green tire”), and this is added with a mold. Sulfur molding is performed. And the following patent documents 1 thru | or 3 are proposed as a method of shape | molding a green tire conventionally.

  Patent Document 1 discloses a method of pushing up and rolling up a protruding portion of a tire member with a bladder that is preliminarily charged on the inner peripheral surface side and expands in a balloon shape. As described above, the method of winding the tire member using the bladder is generally called a “bladder method”.

  In Patent Documents 2 to 3, as shown in FIG. 18, a tire member includes a plurality of rollers r spaced in the circumferential direction on the inner peripheral surface of the protruding portion c of the tire member along the main body g. Disclosed is a method of winding the protruding portion c around the main body g by pushing it up in the radial direction of the tire from the inside in the radial direction to the outside. Such a winding method is generally called “mechanical method”.

JP 2003-39572 A JP 2004-268371 A JP 2004-9298 A

  The bladder system disclosed in Patent Document 1 requires maintenance such as periodically replacing the bladder. For this reason, there is a problem that the production line must be stopped every maintenance, and the productivity cannot be sufficiently improved.

  In addition, the mechanical systems disclosed in Patent Documents 2 to 3 do not require the maintenance of the bladder as described above. However, as shown in FIG. 16, in order to push up the roller r in parallel with the radial direction, the outer surface of the bead portion or the sidewall portion of the raw tire t was pressed by the roller r as shown in FIG. A groove-shaped recess e and a non-pressing portion f not in contact with the roller r are provided between the recess e. In such a non-pressing portion f, the protruding portion c and the main body portion g are not sufficiently adhered, and as a result, air may remain inside. If a large amount of air remains in the raw tire t, there are problems such as defective molding during vulcanization and significant deterioration in durability.

  The present invention has been devised in view of the above circumstances, and by moving the roller that winds the protruding portion from the inside in the radial direction to the outside and obliquely with respect to the radial direction of the tire, compared to the conventional case. Manufacturing of pneumatic tires that can increase the contact (pressing) length between the roller and the protruding portion, and thereby effectively discharge the air between the main body portion and the protruding portion of the tire member, thereby suppressing the occurrence of defective products. It is an object to provide a method and a green tire forming apparatus.

  The invention according to claim 1 of the present invention is a pneumatic tire using a raw tire molding device including a molding drum having a substantially cylindrical shape and tire member sticking devices disposed on both sides in the axial direction of the molding drum. The sticking device includes a slide member that is movable in the axial direction, and an arm that has one end pivotally attached to the slide member so as to be able to swing in the radial direction and the other end extending toward the molding drum. A plurality of oscillating arms including a main body and a roller pivotally attached to the other end of the arm main body, and a plurality of swing arms spaced apart from each other in the circumferential direction; A step of winding a tire member including a carcass ply in a cylindrical shape across the swinging arm held in a step, a step of fitting a pair of bead cores into the tire member, and a tire member between the bead cores in a toroid shape A step of inflating to form a main body portion, and by moving the slide member toward the forming drum while applying a relative rotation between the main body portion and the slide member, and protruding outward from the bead core in the axial direction. The roller in contact with the inner peripheral surface of the protruding portion of the tire member is moved along the main body portion from the inside in the tire radial direction to the outside and obliquely with respect to the radial direction of the tire so that the protruding portion becomes the main body portion. And a winding step for winding.

  The invention according to claim 2 is the method for producing a pneumatic tire according to claim 1, wherein the main body portion rotates 10 to 50 degrees while the roller rolls up the protruding portion by 10 mm in the radial direction.

  According to a third aspect of the present invention, a ring-shaped tread rubber body including at least a tread rubber is affixed to the outer surface of the tread region of the main body portion, and after all or part of the protruding portion is wound up The roller positioned on the outer surface of the tread rubber body is moved by moving the slide member in a direction away from the forming drum while giving a relative rotation between the main body portion and the slide member. A tread rubber pressing step in which the tread rubber body is moved along the outer surface of the tire and obliquely with respect to the radial direction of the tire so that the tread rubber body is brought into close contact with the main body portion. .

  According to a fourth aspect of the present invention, there is provided a cylindrical molding drum around which a tire member including a carcass ply is wound, and a pair of bead cores arranged on both outer sides in the axial direction of the molding drum and extrapolated to the tire member A pair of axially movable bead core holding devices that hold the inner peripheral surface of the pair of bead core holding devices, and a protruding portion that is disposed on both outer sides of the pair of bead core holding devices and that is on the outer side in the tire axial direction than the bead core. A green tire molding apparatus including a sticking device wound around and extending the protruding portion outward in the radial direction of the tire, wherein the sticking device is a slide member movable in the axial direction of the forming drum; It extends in the tire axial direction through the inner peripheral surface side, and one end is pivotally attached to the slide member so as to be able to swing in the radial direction, and the other end is connected to the molding drum side. A plurality of circumferentially spaced apart arm bodies and a caster-like roller provided at the other end of the arm body so as to be swingable about an axis along the longitudinal direction of the arm body. A raw tire molding apparatus comprising: a swing arm; and a relative rotation imparting unit that imparts a relative rotation between the slide member and the bead core holding device.

  According to a fifth aspect of the present invention, the swing arm includes at least a first arm body and a second arm body having a length smaller than the first arm body, and the first arm. The raw tire forming apparatus according to claim 4, wherein the main body and the second arm main body are alternately provided in the circumferential direction.

  In the invention according to the first aspect, the roller contacting the inner peripheral surface of the protruding portion of the tire member is moved obliquely from the inside of the tire radial direction to the outside along the main body portion and with respect to the radial direction of the tire. Wind the protruding part around the main body. Thereby, compared with the case where a roller is moved in parallel with a radial direction, the press length by this roller increases, and the air between the main-body part of a tire member and a protrusion part is eventually discharged | emitted effectively. Therefore, the occurrence of defective products is suppressed.

  In the invention according to claim 4, the other end of the arm body includes a swing arm including a roller provided so as to freely swing around an axis along the longitudinal direction of the arm body. By including rotation imparting means for providing relative rotation between the slide member on which one end of the arm body is pivotally attached and the bead core holding device, the roller is pressed against the inner peripheral surface of the protruding portion and the outer surface of the tread rubber body, and It can be moved obliquely with respect to the radial direction. Therefore, compared with the case where the roller is moved in parallel in the radial direction, the pressing length by the roller is increased, and as a result, the air between the main body portion and the protruding portion of the tire member can be effectively discharged. Generation of non-defective products can be suppressed.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a partial front view of a raw tire molding apparatus 1 of the present embodiment, FIGS. 2 and 3 are enlarged views of main parts thereof, and FIG. 4 is a perspective view of FIG. The raw tire molding apparatus 1 mainly shows the right side of the reference line represented by the symbol C, but the left side has substantially the same configuration.

  The raw tire molding device 1 includes a molding drum 2 having a substantially cylindrical shape, a pair of bead core holding devices 3 arranged on both outer sides in the axial direction of the molding drum 2, and both axial outer sides of the bead core holding device 3. The tire member winding device 4 is disposed and supported by a central shaft 5 extending substantially horizontally.

  The central axis 5 includes a first central axis 5a disposed on the right side in FIG. 1 and a second central axis 5b which is spaced apart from the first central axis 5a and coaxially butted. . The first and second center shafts 5a and 5b are supported in a cantilever manner at the outer ends in the axial direction by a frame F1.

  In the raw tire molding apparatus 1 of the present embodiment, the first portion 1A provided on the first central axis 5a side and the second portion 1B on the second central axis 5b side are provided so as to be able to contact and separate from each other. It is done. For example, in the present embodiment, the first portion 1 </ b> A is provided on a table base TB that is movable in the axial direction of the central axis 5 along the rail R laid on the floor surface F.

  The molding drum 2 includes a center drum 2a disposed at the center thereof and a pair of side drums 2b, 2b disposed adjacent to both sides in the axial direction. The drums 2a and 2b have substantially the same outer diameter, and are arranged coaxially using the first and second center shafts 5a and 5b. Such a forming drum 2 provides a cylindrical outer peripheral surface having a wide width on which a sheet-like tire member can be wound by making the outer peripheral surfaces of the center drum 2a and the side drum 2b substantially continuous in the axial direction. To do. In the present embodiment, the first central shaft 5a and the second central shaft 5b are separated between the center drum 2a and the side drum 2b arranged on the right side thereof.

  In the center drum 2a, for example, an outer peripheral surface that is substantially continuous in the circumferential direction is formed by connecting a plurality of segments s in the circumferential direction, while the segments s are alternately and radially used by using the actuator 2a1. By pulling inward, the diameter can be reduced as shown in FIG.

  The side drum 2b includes a cylindrical base 2b1 and a flange 2b2 fixed to the outer edge in the axial direction. The center drum 2a is opened, and a sleeve 6 is fixed to the flange 2b2. Yes. The sleeve 6 is slidable in the axial direction with respect to the central shaft 5 and is extrapolated to be rotatable. As shown in FIG. 1, a sprocket 6P is fixed to one end side of the sleeve 6 in the axial direction, and an electric motor M1 is linked to the sprocket 6P via a chain CH1. Therefore, the sleeve 6 can be rotated around the central axis 5 by driving the electric motor M1.

  As shown in FIGS. 2 to 3, the bead core holding device 3 includes a ring-shaped inner base 3a fixed to the sleeve 6 in the vicinity of the flange 2b2 of the side drum 2b, and an axially outer side from the inner base 3a. A ring-shaped outer base 3b fixed to the sleeve 6 at a distant position; a slide ring 3c disposed between the inner base 3a and the outer base 3b and movable in the axial direction along the sleeve 6; It includes a core receiving portion 3d that is held so as to be movable only in the radial direction between the base 3a and the outer base 3b, and that can be projected and retracted in the radial direction by sliding of the slide ring 3c.

  The core receiving portion 3d includes a plurality of segments divided in the circumferential direction, and in this embodiment, has a slope 3d1 that engages with the slope 3c1 of the slide ring 3c. For this reason, the core receiving portion 3d can be moved radially outward by the movement of the slide ring 3c in the axial direction, and can move radially inward by the movement of the slide ring 3c in the axial direction. Here, the inside in the axial direction is a direction toward the reference line C, and the outside in the axial direction is a direction away from the reference line C.

  Further, for example, a rubber seat 3e is fixed to the outer surface of the core receiving portion 3d. One end of the rubber seat 3e in the axial direction is fixed to the inner base 3a, and the other end extends beyond the core receiving portion 3d in the axial direction so as to cover the outer base 3b in a cantilever manner.

  The hoisting device 4 is slidable and rotatable in the axial direction with respect to the sleeve 6 and a plurality of slide members 7 attached to the slide member 7 at intervals in the circumferential direction and extending in the axial direction. And a swing arm 8.

  As is apparent from FIG. 5 which is an AA end view of FIG. 3, the swing arm 8 is provided on the slide member 7 at a constant circumferential pitch. The swing arm 8 has one end 8a pivotally attached to the slide member 7 so as to be swingable in the radial direction and the other end 8b extending to the forming drum 2 side, and the other end 8b of the arm body 8A. And a roller 8B pivotally attached to the shaft.

  FIG. 6 shows an enlarged view of the roller 8B. As the roller 8B, a so-called caster-like roller is provided at the other end 8b of the arm body 8A so as to be swingable about an axis L1 along the longitudinal direction of the arm body. That is, in the roller 8B, a support bracket 8Ba and a bolt shaft 8Bb rotatably attached to the support bracket 8Ba via a bearing (not shown) are screwed to the arm body 8A. The ground contact center position CP of the roller 8B is offset from the axis L1 (the axis center line of the bolt shaft 8Bb) by a distance Z (Z ≠ 0). Such a roller 8B can be freely swung around the axis L1 in a direction in which the rotation axis of the roller 8B is always perpendicular to the traveling direction so that the traveling resistance is minimized.

  The swing arm 8 is provided with an annular rubber band B for tightening them. Thereby, as shown in FIGS. 1 to 3, each swing arm 8 (and its outer peripheral surface) is maintained in an initial state of being substantially horizontal. At this time, as shown in FIGS. 2 to 3, each roller 9 is placed on the horizontal outer surface of the outer base 3b.

  Further, as shown in FIG. 1, the raw tire molding apparatus 1 is provided with an axial movement tool D that can move the sleeve 6 and the slide member 7 in the axial direction.

  The axial movement tool D includes a screw shaft 32 extending in a horizontal direction pivotably attached by a pair of bearing members 33, a rail member 34 extending parallel to the screw shaft 32, and screwed to the screw shaft 32. And first and second moving frames F2 and F3 having a ball nut portion 30 and a slide guide 31 which can be slidably engaged with the rail portion 34.

  The upper part of the first moving frame F2 is fixed to the sleeve 6 via a bearing 40. Further, the electric motor M1 for rotating the sleeve 6 is fixed to the second moving frame F2. The upper part of the second moving frame F3 is fixed to the slide member 7.

  Further, the torque of the electric motor M2 is transmitted to the screw shaft 32 via a transmission tool CH2 such as a chain. Further, the screw shaft 32 includes a first screw shaft portion 32a that is screwed to the ball nut portion 30 of the first moving frame F2, and a second screw that is screwed to the ball nut portion 30 of the second moving frame F3. The shaft portion 32b is disposed so as to be coaxially butted via a power transmission on / off means such as an electromagnetic clutch 36, for example.

  Such an axial movement tool D moves the first and second moving frames F2, F3 in the axial direction at the same speed by driving the electric motor M2 in a predetermined direction with the electromagnetic clutch 36 connected. Can be. As a result, the sleeve 6 and the slide member 7 can move inward in the axial direction at the same speed. Thereby, for example, as shown in FIG. 3, the center drum 2 a can be reduced in diameter, and the pair of side drums 2 b and 2 b can be brought close to each other together with the sleeve 6.

  Further, by driving the electric motor M2 in the same direction as described above with the electromagnetic clutch 36 disconnected, only the second moving frame F3 can be moved inward in the axial direction without moving the sleeve 6 in the axial direction. Accordingly, the swing arm 8 can swing in a direction in which the roller 8B goes up the slope 3b1 provided on the outer base 3b while the rubber band B is extended. Further, when the electromagnetic clutch 36 is disengaged, the swinging arm 8 swings in the direction in which the roller 8B moves down the inclined surface 3b1 by the tightening force of the rubber band B by the movement of the slide member 7 in the axial direction outside. To do. 2 and 3, the virtual cylinder connecting the outer peripheral surface 8c of the arm body 8A is formed substantially equal to the outer diameter of the forming drum 2.

  A process of forming a raw tire using the raw tire forming apparatus 1 configured as described above will be described. First, as shown in FIG. 7, a pair that forms an annular shape from a gap j (here, the first and second center shafts 5a and 5b are separated) between the center drum 2a and the side drum 2b. It is desirable that the bead core 15 is fitted in the molding drum 2 and waits at a position on the outside in the axial direction so as not to obstruct the sticking of the tire member 10 as indicated by an imaginary line.

  Next, the sheet-like tire member 10 is wound in a cylindrical shape across the forming drum 2 and the swing arm 8 held substantially along the axial direction. The tire member 10 includes, for example, an inner liner rubber 11, a bead rubber 14 connected to an edge in the width direction, a side wall rubber 13 connected to the bead rubber 14, and a carcass ply 12 wound around the outside. These may be integrated in advance or may be wound separately as in the present embodiment. At this time, the outer surface of the rubber seat 3e of the bead core holding device 3 is slightly in the radial direction from the outer surface of the molding drum 2 in consideration of, for example, the thickness of the bead rubber 14 and the subsequent fitting process of the bead core 15. It is desirable to wait at the inner position.

  Next, a step of fitting a pair of bead cores 15 on the outside of the tire member 10 is performed. The bead core 15 is fitted into a position corresponding to the core receiving portion 3 d of the bead core holding device 3. Thereafter, as shown in FIG. 8, the core receiving portion 3d is moved radially outward. Thereby, the core receiving part 3d can press and hold the inner peripheral surface of the bead core 15 via the rubber seat 3e and the tire member 10. In addition, it is desirable that the bead core 15 is integrally provided with a bead apex rubber 16 having, for example, a substantially triangular cross section.

  Next, as shown in FIG. 9, a process of forming the main body portion 20 by inflating the tire member 10 between the bead cores 15 and 15 in a toroid shape is performed. That is, after the diameter of the center drum 2a of the forming drum 2 is reduced, the left and right sleeves 6 are moved together with the slide member 7 in the axial direction. As a result, the bead core holding device 3 fixed to the sleeve 6 moves in the axial direction while holding the bead core 15, and the axial distance between the bead cores 15 and 15 can be reduced from CW0 to CW1. At the same time, for example, by supplying high-pressure air or the like to the inner region i of the tire member 10, the tire member 10 between the bead cores 15 and 15 can be inflated and deformed in a toroidal shape.

  At this time, the tread region of the main body 20 is bonded to the inner peripheral surface of the ring-shaped tread rubber body 17 including the belt layer 17a and the tread rubber 17b waiting in advance in the radial direction.

  Next, in this embodiment, a stitching process is performed. In the stitching process, as shown in FIG. 10, a stitch roller 19 having the same circumferential surface as the tire circumferential direction is pressed against the outer surface of the tread rubber body 17 and the sleeve 6 is rotated to rotate the tire member. At the same time, the stitch roller 19 is moved slowly along the outer surface of the tread rubber body 17 in the axial direction. As a result, the tread rubber body 17 is deformed and closely adhered along the outer surface of the tread region of the main body 20 shaped in a toroidal shape.

  After the stitching step, a winding step is performed in which the protruding portion 21 of the tire member protruding outward in the axial direction from the bead core 15 is wound up to the main body portion 20 side. The protruding portion 21 includes at least the carcass ply 12 and the sidewall rubber 13.

  As shown in FIG. 11, the winding process is performed by moving the slide member 7 in the axial direction toward the forming drum 2 while applying a relative rotation between the main body 20 and the slide member 7. That is, the bead core holding device 3 is rotated via the sleeve 6 by driving the electric motor M1. Further, the electric motor M2 is driven in a predetermined direction with the electromagnetic clutch 36 of the axial direction moving tool D disconnected. Thus, only the slide member 7 is moved inward in the axial direction while the sleeve 6 is stopped. That is, in the present embodiment, the axial movement tool D and the electric motor M1 that rotates the sleeve 6 can function as a relative rotation imparting unit that imparts a relative rotation between the slide member 7 and the bead core holding device 3.

  As a result, the roller 8B receives a force that is pushed up in the radial direction by the swing arm 8 that expands in the radial direction, and the circumferential rotational force from the protruding portion 21 of the tire member 10 that rotates about the central axis 5. Receive. With these resultant forces, the roller 8B swings the neck and winds the protruding portion 21 around the main body portion 20 while moving obliquely with respect to the radial direction.

  FIG. 12A shows a side view of the green tire t that has undergone such a winding process. The roller 8B is in contact with the sidewall portion of the green tire t obliquely with respect to the radial direction RL. In this embodiment, the recess e is illustrated in a spiral shape. The contact length of this roller is larger than in the conventional method in which the roller is moved up in parallel with the radial direction RL. Therefore, more air from the protruding portion 21 and the main body portion 20 can be discharged to the outside as compared with the conventional case. For this reason, generation | occurrence | production of inferior goods can be suppressed. The radial direction is the direction of the cut surface at which the plane including the tire rotation axis cuts the tire.

  In addition, the relative rotation amount between the main body 20 and the slide member 7 during the winding process can be variously determined. Preferably, it is desirable to rotate the main body 20 by 10 to 50 °, more preferably 15 to 30 °, while the roller 8B rolls up the protruding portion by 10 mm in the radial direction. If the amount of rotation is less than 10 (° / 10 mm), the contact pressure length between the protruding portion and the roller 8B may not be increased sufficiently. Conversely, the amount of rotation exceeds 50 (° / 10 mm). If it exceeds, the winding force tends to be insufficient, and as a result, the productivity may be deteriorated. In particular, by adjusting the rotation amount, the entire region of the sidewall portion of the raw tire t can be pressed by the roller 8B.

  Note that, after the winding process, the slide member 7 is moved outward in the axial direction. Thereby, since the roller 8B is always fastened by the rubber band B, the rolled-up portion can be pressed again, and the protruding portion 21 and the main body portion 20 can be further brought into close contact (the lowering step). At this time, by maintaining the rotation of the tire member 10, for example, as shown in FIG. 12B, the roller 8B can be moved obliquely from the outside in the radial direction to the inside and in the radial direction of the tire. . In such a raw tire t, the entire area is substantially pressed by the roller 8B and pressed so that the recesses e intersect, so that undulation is reduced and a pneumatic tire with high uniformity is obtained. To help.

  In the above-described embodiment, the example in which the tread rubber 17b of the tread rubber body 17 is brought into close contact with the main body portion 20 in the stitching process using the stitch roller 19 has been described, but instead of this stitching process or the stitching process. Further, the tread rubber 17b may be further pressed using the swing arm 8 (tread rubber pressing step). A schematic diagram illustrating such a tread rubber pressing step is shown in FIG.

  First, the protruding portion 21 is wound up by moving the roller 8B of the swing arm 8 in the order of A, B, and C as described above.

  Next, the swing arm 8 is lifted by a lever or the like (not shown), and the roller 8B is made to stand by at the second position. In the second position, the roller 8B is located on the outer side in the tire axial direction with respect to the radial line X passing through the side edge of the tread rubber body 17. Thereby, it winds around the main-body part 20 without interfering with the tread rubber body 17b and the roller 8B.

  After the tread rubber body 17 is affixed to the main body portion 20, the pulling of the swing arm 8 is released, and the roller 8B is moved to the position of the ho that contacts the outer surface of the tread rubber 17b. Thereafter, the slide member 7 is moved away from the forming drum 2 while applying a relative rotation between the main body 20 and the slide member 7. As a result, the roller 8b positioned on the outer surface of the tread rubber 17b moves along the outer surface of the tread rubber 17b and obliquely with respect to the radial direction of the tire, thereby bringing the tread rubber body 17 into close contact with the main body portion 20. be able to. In such an embodiment, it is particularly desirable in that the swing arm 8 can be shared for winding the protruding portion 21 and pressing the tread rubber 17b.

  14 and 15 show another embodiment of the present invention. In this embodiment, the swing arm 8 includes a first arm main body 8A1 and a second arm main body 8A2 having a length smaller than that of the first arm main body 8A1. It is provided alternately.

  The roller 8B of the second arm main body 8A2 is provided at a position that does not interfere with these arm main bodies 8A1 on the radially inner side from the space between the adjacent first arm main bodies 8A1 and 8A1. The second arm main body 8A2 extends through the space. Thus, the swing arm 8 can densely arrange the arm bodies 8A1 and 8A2 without causing the rollers 8B1 and 8B2 of the first arm body 8A1 and the second arm body 8A2 to interfere with each other. it can. Therefore, as shown in FIG. 16, the roller 8B can be brought into contact with a larger area of the sidewall portion of the raw tire t and wound up, so that the remaining air inside the raw tire can be further reduced. As a particularly preferable aspect, it is desirable that 20 or more, more preferably 30 or more swing arms 8 are arranged in the circumferential direction.

  In addition, the molded raw tire t can be taken out from between the first portion 1A and the second portion 1B separated from each other.

  Although the embodiments of the present invention have been described above, the present invention is not limited to the specific embodiments illustrated, and it is needless to say that various modifications can be made without departing from the scope of the present invention. For example, in the above-described embodiment, the slide member 7 is moved in the axial direction and the main body 20 of the raw tire is rotated. However, the main body 20 is fixed and moved in the axial direction while rotating the slide member 7 ( That is, it may be screwed back and forth.

  In order to confirm the effect of the present invention, 20 raw tires (tyre size “215 / 60R16 95H”) were each molded according to the winding process specifications shown in Table 1 and vulcanized. The occurrence rate of defective products such as (bulging by internal air) was examined. The results are all expressed as an index with the comparative example 1 in which the protruding part is wound up by moving the roller parallel to the radial direction, and the smaller the value, the better. The test results are shown in Table 1.

  As a result of the test, it was confirmed that the defective product occurrence rate was drastically reduced in the method of the example.

It is a front view of the raw tire shaping | molding apparatus which shows embodiment of this invention. It is the principal part enlarged view. It is sectional drawing which shows the state which changed the shaping | molding drum. It is a principal part perspective view of a raw tire shaping | molding apparatus. FIG. 4 is an AA end view of FIG. 3. It is an enlarged view of the roller of a rocking arm. It is sectional drawing which shows the state which wound the tire member around the raw tire shaping | molding apparatus. It is sectional drawing which shows the state which hold | maintained the bead core with the core receiving part of the bead core holding | maintenance apparatus. It is sectional drawing which shows the process of shape | molding a main-body part. It is sectional drawing which shows a stitching process. It is sectional drawing explaining a winding process. It is a side view of a raw tire. It is the schematic explaining a tread rubber press process. It is principal part sectional drawing of the raw tire shaping | molding apparatus which shows other embodiment of a rocking | fluctuating arm. It is a top view of the swing arm. It is sectional drawing explaining a winding process. It is sectional drawing explaining the conventional winding process. It is a perspective view of the conventional green tire.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Raw tire shaping | molding apparatus 2 Molding drum 3 Bead core holding | maintenance apparatus 4 Winding apparatus 7 Slide member 8 Swing arm 8A Arm main body 8A1 First arm main body 8A2 Second arm main body 8B Roller 10 Tire member 12 Carcass ply 13 Side wall rubber 15 Bead core 20 Main body part 21 Extruding part t Raw tire

Claims (5)

A method of manufacturing a pneumatic tire using a raw tire molding device including a molding drum having a substantially cylindrical shape and a tire member sticking device disposed on both sides in the axial direction of the molding drum,
The sticking device is
A slide member movable in the axial direction; an arm body having one end pivotally attached to the slide member so as to swing in a radial direction and the other end extending toward the forming drum; and rotating to the other end of the arm body Including a plurality of swing arms spaced circumferentially including a freely pivoted roller,
Winding a tire member including a carcass ply in a cylindrical shape across the forming drum and the swing arm held along the axial direction;
Fitting a pair of bead cores into the tire member;
A step of inflating a tire member between the bead cores in a toroidal shape to form a main body portion; and
An inner peripheral surface of a protruding portion of the tire member that protrudes outward in the axial direction from the bead core by moving the slide member toward the forming drum while applying relative rotation between the main body portion and the slide member. And a winding step of winding the protruding portion around the main body portion by moving the roller in contact with the main body portion from the inside in the tire radial direction to the outside and obliquely with respect to the radial direction of the tire. A method of manufacturing a pneumatic tire.   2. The method for manufacturing a pneumatic tire according to claim 1, wherein the main body portion rotates 10 to 50 degrees while the roller rolls up the protruding portion by 10 mm in the radial direction. 3. A ring-shaped tread rubber body including at least tread rubber is attached to the outer surface of the tread region of the main body,
After winding up all or a part of the protruding portion, the slide member is moved away from the molding drum while giving a relative rotation between the main body portion and the slide member. 2. A tread rubber pressing step in which the roller positioned on the outer surface is moved along the outer surface of the tread rubber body and obliquely with respect to the radial direction of the tire so that the tread rubber body is in close contact with the main body. Or the manufacturing method of the pneumatic tire of 2. A cylindrical molding drum around which a tire member including a carcass ply is wound;
A pair of bead core holding devices which are arranged on both outer sides in the axial direction of the forming drum and which are movable in the axial direction to hold the inner peripheral surfaces of the pair of bead cores inserted through the tire member via the tire member;
A raw tire molding device including a sticking device that is arranged on both outer sides of the pair of bead core holding devices and winds a protruding portion outside the bead core in the tire axial direction and winds the protruding portion outward in the tire radial direction. There,
The sticking device is
A slide member movable in the axial direction of the molding drum;
An arm main body extending in the tire axial direction through the inner peripheral surface side of the protruding portion and having one end pivotally attached to the slide member so as to be able to swing in the radial direction, and the other end extending to the molding drum side; A plurality of swinging arms spaced apart in the circumferential direction including a caster-like roller provided at the other end so as to freely swing around an axis along the longitudinal direction of the arm body, and the slide member A raw tire forming apparatus, comprising: a relative rotation imparting unit that imparts a relative rotation with the bead core holding device. The swing arm includes at least a first arm body and a second arm body having a length smaller than the first arm body,
The raw tire molding apparatus according to claim 4, wherein the first arm body and the second arm body are alternately provided in a circumferential direction.

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