JP2008307849A - Molding drum - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a molding drum capable of uniforming the outer diameter of the end part side of a hollow cylinder over all the periphery without forming a vestige caused by contacting with each arm on the end part side of the hollow cylinder when the end part side of the hollow cylinder is stuck onto a troidal part. <P>SOLUTION: Since each strip-shaped member 50 intervenes between each roller 30 and an end part side CB2 of the hollow cylinder, and between each arm 20 and the end part side CB2 of the hollow cylinder when the end part side CB2 of the hollow cylinder is stuck onto the troidal part CB1 by each of the roller 30, the inner periphery face of the hollow cylinder CB does not contact with each of the arm 20 so that the vestige caused by contacting with each of the arm 20 is not formed on the end part side CB2 of the hollow cylinder. Furthermore, as each of the strip-shaped member 50 is transferred to the side of the troidal part CB1 together with the end part side CB2 of the hollow cylinder, the end part side CB2 of the hollow cylinder is not extended in the axial direction of the hollow cylinder by contact resistance with the each arm 20 so that the outer diameter of the end part side CB2 of the hollow cylinder stuck to the troidal part CB1 becomes uniform over all the periphery. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  For example, in the manufacturing process of a pneumatic tire for an automobile, the present invention attaches a pair of bead members to a cylindrical body formed by molding an inner liner member, a carcass member, a sidewall member, etc. into a toroidal shape. The present invention relates to a forming drum.

Generally, as this type of forming drum, as shown in FIGS. 10 to 13, a pair of bead members BE are arranged at predetermined positions in the axial direction on the outer peripheral surface side of the cylindrical body CB made of unvulcanized rubber. Thus, a pair of holding mechanisms 100 that respectively hold the bead members BE from the inside in the radial direction of the cylindrical body CB, and between the holding mechanisms 100 while moving the holding mechanisms 100 closer to each other in the cylindrical body axis direction. Forming means for forming the cylindrical body CB in a toroidal shape, and arranged in the circumferential direction of the cylindrical body on the outer side in the cylindrical body axial direction with respect to each holding mechanism 100, and one end side thereof is disposed on the holding mechanism 100 side. The plurality of arms 110 and each arm 110 are supported so that the other end can be rotated so that one end moves in the cylindrical body radial direction, and each arm 110 is supported so as to be movable in the cylindrical body axis direction. Support mechanism 12 And a plurality of rollers 130 rotatably supported at one end of each arm 110, each bead member BE is held by each holding mechanism 100, and a cylindrical shape between the holding mechanisms 100 is formed by a forming unit. In a state where the body CB is formed in a toroidal shape, each arm 110 is moved to the holding mechanism 100 side by the support mechanism 120, whereby each roller 130 is pressed against the holding mechanism 100 and each arm 110 rotates. As a result, each roller 130 moves toward the outside in the cylindrical body radial direction, and the cylindrical body end side CB2 arranged outside the bead member BE in the cylindrical body axial direction is moved by each roller 130 to the bead member. It is known that it is attached to the toroidal portion CB1 which is folded around BE and formed into a toroidal shape ( In example, see Patent Document 1.).
JP 2005-319598 A

  However, in the forming drum, each arm 110 rotates outward in the cylindrical body radial direction, and the cylindrical body end side CB2 is sequentially pushed radially outward from a position close to the toroidal portion CB1 by each roller 110. Since the inner peripheral surface of the cylindrical body end portion CB2 far from the toroidal portion CB1 is in contact with each arm 110 and the cylindrical body end portion CB2 is in contact with each arm 110, the toroidal portion CB1 (See FIG. 11). As a result, a contact mark CM with each arm 110 is formed on the cylindrical body end side CB2 attached to the toroidal portion CB1 (see FIG. 13), which is not preferable for improving tire quality. It was.

  Moreover, since the inner peripheral surface of the cylindrical body end side CB2 moves to the toroidal portion CB1 while contacting each arm 110, the portion of the cylindrical body end side CB2 that contacts each arm 110 is caused by contact resistance. By extending in the cylindrical body axial direction, the end outer diameter of the cylindrical body end side CB2 attached to the toroidal portion CB1 becomes non-uniform (see FIG. 13), which is preferable for improving tire quality. There was no problem.

  The present invention has been made in view of the above-described problems, and the object of the present invention is to make contact marks with each arm on the end of the tubular body when the end of the tubular body is attached to the toroidal portion. The object is to provide a molding drum in which the outer diameter of the end of the cylindrical body end can be made uniform over the entire circumference.

  In order to achieve the above object, the present invention provides each bead member with a diameter of the cylindrical body in a state where a pair of bead members are arranged at predetermined positions in the axial direction on the outer peripheral surface side of the cylindrical body made of unvulcanized rubber. A pair of holding mechanisms each holding from the inner side in the direction, a molding means for forming the cylindrical body between the holding mechanisms in a toroidal shape while moving each holding mechanism so as to approach each other in the cylindrical body axis direction, and each holding A plurality of arms provided on the outer side in the cylindrical body axial direction with respect to the mechanism and arranged in the cylindrical body circumferential direction, each having one end side disposed on the holding mechanism side, and each arm having one end side in the cylindrical body radial direction A support mechanism that rotatably supports the other end side so as to move, and supports each arm movably to the holding mechanism side, and a plurality of rollers that are rotatably supported at one end of each arm. Each bead member is held by each holding mechanism. In addition, in the state where the cylindrical body between the holding mechanisms is formed in a toroidal shape by the forming means, each roller is moved to the holding mechanism side by the support mechanism, so that each roller becomes the holding mechanism or the cylindrical shape. Each roller is moved toward the outside in the cylindrical body radial direction while being pressed against the body, and the end of the cylindrical body disposed outside the bead member in the cylindrical body axial direction is moved by the bead member. In a forming drum that is folded around and attached to a toroidal portion that is formed in a toroidal shape, the rollers are in contact with the rollers from the outside in the radial direction of the cylindrical body, and are formed so as to extend along the arms. On the other hand, it is provided with a plurality of belt-like members that are movably provided on the holding mechanism side, and each belt-like member is attached to the toroidal portion with the end of the cylindrical body by each roller. Kicking during constitutes so as to be interposed between the rollers and the arms and the tubular body end side.

  Thus, each roller is in contact with the outer side in the cylindrical body radial direction, and is formed so as to extend along each arm. When the cylindrical body end side is attached to the toroidal portion by each roller, each belt-like member is interposed between each roller and each arm and the cylindrical body end side, so that each arm is cylindrical. When the cylindrical body end side is rotated outward from the position close to the toroidal part sequentially from the position close to the toroidal portion by each roller, the inner peripheral surface on the cylindrical body end side There is no direct contact with the arm, and no contact mark with each arm is formed on the end of the cylindrical body attached to the toroidal portion. In addition, since each belt-like member is movable to the holding mechanism side with respect to each arm, each belt-like member is attached to the toroidal portion when each roller is attached to the toroidal portion. The cylindrical body end side is not stretched in the cylindrical body axial direction due to contact resistance with each arm, and the end of the cylindrical body end side attached to the toroidal part is outside. The diameter is uniform over the entire circumference.

  Further, the present invention holds each bead member from the radially inner side of the cylindrical body in a state where the pair of bead members are arranged at predetermined positions in the axial direction on the outer peripheral surface side of the cylindrical body made of unvulcanized rubber. A pair of holding mechanisms, a forming means for forming the cylindrical body between the holding mechanisms in a toroidal shape while moving the holding mechanisms so as to approach each other in the cylindrical body axis direction, and a cylinder with respect to each holding mechanism A plurality of arms provided on the outer side in the cylindrical body axis direction so as to be arranged in the circumferential direction of the cylindrical body, each having one end side disposed on the holding mechanism side, and each arm being moved so that one end side moves in the cylindrical body radial direction. A support mechanism that rotatably supports the end side and each arm is supported to be movable to the holding mechanism side, and a plurality of rollers that are rotatably supported at one end of each arm. Each bead member is held, Each roller is pressed against the holding mechanism or the cylindrical body by moving each arm to the holding mechanism side by the support mechanism in a state where the cylindrical body between the holding mechanisms is formed in a toroidal shape by the shaping means. At the same time, each roller moves toward the outer side in the cylindrical body radial direction, and the cylindrical body end side arranged outside the bead member in the cylindrical body axial direction is folded around the bead member by each roller. In a forming drum to be attached to a toroidal portion formed in a toroidal shape, the roller is formed in a cylindrical shape covering each roller from the outside in the cylindrical body radial direction, and is formed so as to extend along each arm. A cylindrical member that is formed to be elastically deformable in the body radial direction and is movable to the holding mechanism side with respect to each arm is provided, and the cylindrical member is formed into a cylindrical body by each roller. The part side when pasting the toroidal portion constitutes so as to be interposed between the rollers and the arms and the tubular body end side.

  As a result, each roller is formed in a cylindrical shape that covers from the outside in the cylindrical body radial direction, is formed so as to extend along each arm, is formed to be elastically deformable in the cylindrical body radial direction, A cylindrical member provided so as to be movable to the holding mechanism side with respect to the arm, and when the cylindrical body end side is attached to the toroidal portion by each roller, the cylindrical member is cylindrical with each roller and each arm. Since each arm rotates toward the outside in the cylindrical body radial direction because it is interposed between the body end side and the cylindrical body end side from the position close to the toroidal portion by each roller, the arm gradually turns radially outward. When being spread out, the inner peripheral surface of the cylindrical body end side does not directly contact each arm, and a contact mark with each arm is formed on the cylindrical body end side attached to the toroidal portion. There is nothing to do. In addition, since the cylindrical member is movable to the holding mechanism side with respect to each arm, when the cylindrical body end side is attached to the toroidal portion by each roller, the cylindrical member is on the cylindrical body end side. The end of the tubular body is not stretched in the axial direction of the tubular body due to the contact resistance with each arm, and the end of the tubular body attached to the toroidal portion is outside the end. The diameter is uniform over the entire circumference.

  According to the present invention, when the cylindrical body end side is affixed to the toroidal portion, the cylindrical body affixed to the toroidal portion without forming contact marks with each arm on the cylindrical body end side. Since the outer diameter of the end on the side of the shape body can be made uniform over the entire circumference, it is extremely advantageous for improving the tire quality.

  1 to 4 show a first embodiment of the present invention. FIG. 1 is a side sectional view of an essential part of a forming drum, FIGS. 2 and 3 are explanatory views of the operation of the forming drum, and FIG. 4 is an end of a cylindrical body. It is a front view of the cylindrical body by which the part side was affixed on the toroidal part.

  The molding drum of the present embodiment includes a pair of bead members BE arranged at predetermined positions in the axial direction on the outer peripheral surface side of the cylindrical body CB made of the support shaft 1 and unvulcanized rubber. A pair of holding mechanisms 10 in the axial direction that are respectively held from each other, and provided on both sides in the cylindrical body axis direction with respect to each holding mechanism 10, and cylindrical on the outside in the cylindrical body axis direction with respect to each holding mechanism 10 A plurality of arms 20 provided so as to be arranged in the body circumferential direction, each having one end side disposed on the holding mechanism 10 side, a plurality of rollers 30 rotatably supported on one end of each arm 20, and each holding mechanism 10 Are provided on both sides in the cylindrical body axial direction, and a pair of axial support members 40 that support the other end side of each arm 20 and each roller 30 are in contact with each roller from the outside in the cylindrical body radial direction. , Each arm And a plurality of belt-shaped member 50 formed so as to extend along the 0. Each holding mechanism 10 is provided symmetrically in the cylindrical body axis direction, and each arm 20, each roller 30, each support member 40, and each band member 50 is also provided symmetrically in the cylindrical body axis direction. 1 to 3 and the following text, the holding mechanism 10 on one side in the axial direction, the arms 20, the rollers 30, the support members 40, and the strip members 50 will be described. The cylindrical body CB is formed by forming an inner liner member, a carcass member, a sidewall member, etc. into a cylindrical shape.

  The support shaft 1 is rotatably supported by a base (not shown), and a drive shaft 2 is inserted through the support shaft 1. The drive shaft 2 is rotated by a motor or the like (not shown), and a screw portion 2 a provided with a right screw and a left screw is provided on the outer peripheral surface of the drive shaft 2. A pair of long holes 1 a in the axial direction are provided in a part of the support shaft 1, and each long hole 1 a is formed to extend in the axial direction of the support shaft 1. The axial direction of the support shaft 1 coincides with the cylindrical body axis direction.

  The holding mechanism 10 is provided so as to be aligned in the circumferential direction, and a plurality of bead lock members 11 that can hold the bead member BE from the inside in the radial direction of the cylindrical body CB, and the diameter of the holding mechanism 10. The holding mechanism main body 12 is supported so as to be movable in the direction, and the piston 13 is configured to move each bead lock member 11 in the radial direction. The holding mechanism main body 12 is fitted to the support shaft 1 so as to be movable in the cylindrical body axis direction, and a screwing member 12 a is provided on the inner peripheral surface of the holding mechanism main body 12. The screwing member 12a is inserted through the long hole 1a and screwed into the screw portion 2a. For this reason, when the drive shaft 2 rotates, the holding mechanisms 10 move in a direction toward or away from each other.

  Each arm 20 is provided with a hook 20a at a substantially central portion in the longitudinal direction, and an elastic ring 20b such as a rubber ring or a metal spring is locked to each hook 20a from the outside in the radial direction. That is, each arm 20 is urged toward the inside in the cylindrical body radial direction by the elastic ring 20b.

  Each roller 30 is formed in a columnar shape, and is arranged so that the rotation axis extends in a tangential direction of a virtual circle arranged coaxially with the cylindrical body.

  The support member 40 is formed in a cylindrical shape, and a plurality of protrusions 40a are provided on the outer peripheral surface of the support member 40 at intervals in the circumferential direction. Each protrusion 40 a is formed so as to extend radially outward from the outer peripheral surface of the support member 40. Further, each arm 20 is rotatably supported by each projection 40a at the other end so that one end thereof moves in the cylindrical body radial direction.

  The support member 40 is fitted to the outer peripheral surface of the cylindrical movable member 41 so as to be movable in the axial direction. The movable member 41 is fitted to the support shaft 1 so as to be movable in the axial direction, and one end is connected to the holding mechanism main body 12. That is, the movable member 41 moves in the cylindrical body axis direction together with the holding mechanism 10. A first air chamber 40b and a second air chamber 40c are provided between the inner peripheral surface of the support member 40 and the outer peripheral surface of the movable member 41, and each air chamber 40b and 40c is compressed by a compressed air supply device (not shown). By supplying air, the support member 40 moves in the axial direction with respect to the movable member 41. That is, each arm 20 is supported by the support member 40 so as to be movable in the cylindrical body axis direction.

  Each belt-like member 50 is made of a material having rubber-like elasticity such as rubber or urethane, and a reinforcing member 50a capable of restricting expansion in the direction along each arm 20 is embedded therein. Examples of the reinforcing member 50a include a metal cord extending in the direction along each arm 20, a cord made of synthetic resin, a cloth material made of metal fiber or synthetic resin fiber, and the like. In addition, each strip member 50 has a substantially uniform thickness dimension in the longitudinal direction. One end of each band member 50 is connected to the holding mechanism 10 via a wire 51, and the other end of each band member 50 is connected to the other end side of each arm 20 via an elastic mechanism 52. The elastic mechanism 52 is made of a metal coil spring, allows movement of the other end of the belt-like member 50 toward the holding mechanism 10, and can bias the belt-like member 50 toward the side opposite to the holding mechanism 10. That is, each belt-like member 50 can move toward the holding mechanism 10 with respect to each arm 20.

  When molding an unvulcanized tire in the molding drum configured as described above, first, the cylindrical body CB is disposed on the outer peripheral surface side of each holding mechanism 10 and the shaft on the outer peripheral surface side of the cylindrical body CB. A pair of bead members BE are arranged at predetermined positions in the direction, and each bead member BE is held from the radially inner side of the cylindrical body CB by each bead lock member 11 of each holding mechanism 10.

  Subsequently, by rotating the drive shaft 2 of the support shaft 1, the holding mechanisms 10 are moved between the holding mechanisms 10 by a well-known compressed air supply device (not shown) while moving the holding mechanisms 10 closer to each other in the cylindrical body axis direction. The cylindrical body CB between the holding mechanisms 10 is formed into a toroidal shape by supplying compressed air (see FIG. 1).

  Subsequently, by supplying compressed air to the first air chamber 40b of the support member 40, the support member 40 is moved to the holding mechanism 10 side. As a result, each arm 20 also moves to the holding mechanism 10 side, and each roller 30 is pressed against the axial end surface of the holding mechanism 10, and each roller 30 has a cylindrical body diameter due to an inclination of the axial end surface of the holding mechanism 10 or the like. Move outward in the direction. Here, each arm 20 rotates toward the outside in the cylindrical body radial direction, whereby each roller 30 moves toward the outside in the cylindrical body radial direction. Further, the cylindrical body end side CB2 disposed outside the bead member BE in the cylindrical body axis direction is folded around the bead member BE by each roller 30 to form a toroidal portion CB1. It is pasted.

  At this time, each roller 30 is in contact with the outer side in the cylindrical body radial direction, is formed so as to extend along each arm 20, and is provided so as to be movable toward the holding mechanism 10 with respect to each arm 20. When the cylindrical body end side CB2 is affixed to the toroidal portion CB1 by each roller 30 with the plurality of belt-shaped members 50, the respective belt-shaped members 50 are respectively connected to the rollers 30, the arms 20, and the cylindrical body end side. Since each arm 20 is rotated toward the outside in the cylindrical body radial direction because it is interposed between the CB2 and the cylindrical body end side CB2 by each roller 30, the radial direction sequentially starts from a position close to the toroidal portion CB1. When being pushed outward, the inner peripheral surface of the cylindrical body CB does not directly contact each arm 20, and each arm 20 is connected to the cylindrical body end side CB 2 attached to the toroidal portion CB 1. Never contact trace is formed (see FIG. 4). Since each belt-like member 50 can move to the holding mechanism 10 side with respect to each arm 20, each belt-like member 50 is attached when the cylindrical body end side CB2 is attached to the toroidal portion CB1 by each roller 30. Moves to the toroidal portion CB1 together with the cylindrical body end side CB2, and the cylindrical body end side CB2 is not stretched in the cylindrical body axial direction by contact resistance with each arm 20, and is attached to the toroidal portion CB1. The outer diameter of the attached cylindrical body end side CB2 is uniform over the entire circumference (see FIG. 4). A radial broken line in FIG. 4 is a path through which each roller 30 passes.

  Subsequently, an unvulcanized tire is formed by attaching a belt member or a tread member to the toroidal portion CB1 to which the cylindrical body end side CB2 is attached.

  Thus, according to the present embodiment, when the cylindrical body end side CB2 is attached to the toroidal portion CB1, the contact marks with the arms 20 are formed on the cylindrical body end side CB2. In addition, the outer diameter of the end portion of the cylindrical body end portion CB2 attached to the toroidal portion CB1 can be made uniform over the entire circumference, which is extremely advantageous in improving tire quality.

  In addition, since each belt-like member 50 is formed of a material having rubber-like elasticity and the extension in the direction along each arm 20 is restricted by the reinforcing member 50a embedded therein, each belt-like member 50 is Each roller 30 and each arm 20 can be flexibly bent between the cylindrical body end side CB2, and the cylindrical body end side CB2 can be smoothly attached to the toroidal portion CB1 by each roller 30. Further, since each belt-like member 50 does not extend in the cylindrical body axial direction due to contact resistance with each arm 20, the end outer diameter of the cylindrical body end side CB2 attached to the toroidal portion CB1 is set to the entire circumference. It is extremely advantageous to make it uniform over the entire area.

  In the present embodiment, the belt members 50 having substantially uniform thickness dimensions in the longitudinal direction are provided. However, as shown in FIGS. It is also possible to provide a plurality of belt-like members 55 whose thickness dimensions change in the direction along each arm 20 in accordance with the shape of the portion CB1 or the cylindrical body end side CB2. For example, when unevenness is formed on the side surface of the toroidal part CB1 to which the cylindrical body end side CB2 is attached, the thickness of each belt-like member 55 is set according to the unevenness, so that each roller 30 is smooth. The cylindrical body end side CB2 can always be pressed against the toroidal portion CB1 with a uniform force. Also in this case, each belt-like member 55 is formed of a material having rubber-like elasticity, and is configured such that extension in the direction along each arm 20 is restricted by a reinforcing member 55a embedded therein.

  Further, in the present embodiment, each band member 50 has the reinforcing member 50a and is formed of a material having rubber-like elasticity. However, each band member 50 is made of a cloth material or flexible plastic. It is also possible to form from a plate material.

  FIGS. 7 to 9 show a second embodiment of the present invention. FIG. 7 is a side sectional view of an essential part of the forming drum, and FIGS. 8 and 9 are explanatory views of the operation of the forming drum. In addition, the same code | symbol is attached | subjected and shown to the component equivalent to 1st Embodiment.

  The molding drum of the present embodiment includes the support shaft 1, each holding mechanism 10, each arm 20, each roller 30, each support mechanism 40, and each roller 30 that are equivalent to those in the first embodiment from the outside in the cylindrical body radial direction. A cylindrical member 60 formed so as to extend along each arm 20 is provided.

  The cylindrical member 60 is made of a material having rubber-like elasticity such as rubber or urethane, and a reinforcing member 60a capable of restricting extension in the direction along each arm 20 is embedded therein. Examples of the reinforcing member 60a include a metal cord extending in a direction along each arm 20, a synthetic resin cord, a cloth material made of metal fiber or synthetic resin fiber, and the like. That is, the cylindrical member 60 can be elastically deformed in the cylindrical body radial direction. A ring-shaped member 60b is embedded at one axial end of the cylindrical member 60, and deformation of the cylindrical member 60 at one axial end is restricted. One end in the axial direction of the cylindrical member 60 is connected to the holding mechanism 10 via a plurality of wires 61, and the other end in the axial direction of the cylindrical member 60 is connected to the other end side of each arm 20 via a plurality of elastic mechanisms 62. It is connected to. The elastic mechanism 62 is made of a metal coil spring, allows the other end of the cylindrical member 60 in the axial direction to move toward the holding mechanism 10, and can urge the cylindrical member 60 toward the side opposite to the holding mechanism 10. It is. That is, the cylindrical member 60 is movable toward the holding mechanism 10 with respect to each arm 20.

  When molding an unvulcanized tire in the molding drum configured as described above, each bead member BE is made to have a diameter of the cylindrical body CB by each bead lock member 11 of each holding mechanism 10 as in the first embodiment. While holding each from the inside in the direction, the cylindrical body CB between the holding mechanisms 10 is formed into a toroidal shape (see FIG. 7). Also, compressed air is supplied to the first air chamber 40b of the support member 40, and the cylindrical body end side CB2 is attached to the toroidal portion CB1 by each roller 30.

  At this time, each roller 30 is formed in a cylindrical shape covering from the outside in the cylindrical body radial direction, is formed so as to extend along each arm 20, and is formed so as to be elastically deformable in the cylindrical body radial direction. The cylindrical member 60 is provided so as to be movable toward the holding mechanism 10 with respect to each arm 20, and when the cylindrical body end side CB2 is attached to the toroidal portion CB1 by each roller 30, the cylindrical member 60 is provided. Is interposed between each roller 30 and each arm 20 and the cylindrical body end side CB2, so that each arm 20 is rotated outward in the cylindrical body radial direction, and the cylindrical body is rotated by each roller 30. When the end portion side CB2 is sequentially spread radially outward from a position close to the toroidal portion CB1, the inner peripheral surface of the cylindrical body end portion side CB2 does not directly contact each arm 20, and the toroidal portion CB1 Pasted Never contact trace with each arm 20 to the tubular body end portion CB2 is molded. Moreover, since the cylindrical member 60 can move to the holding mechanism 10 side with respect to each arm 20, when the cylindrical body end side CB <b> 2 is attached to the toroidal portion CB <b> 1 by each roller 30, the cylindrical member 60. Moves to the toroidal portion CB1 together with the cylindrical body end side CB2, and the cylindrical body end side CB2 is not stretched in the cylindrical body axial direction by contact resistance with each arm 20, and is attached to the toroidal portion CB1. An end outer diameter of the attached cylindrical body end side CB2 becomes uniform over the entire circumference.

  Thus, according to the present embodiment, when the cylindrical body end side CB2 is attached to the toroidal portion CB1, the contact marks with the arms 20 are formed on the cylindrical body end side CB2. In addition, the outer diameter of the end portion of the cylindrical body end portion CB2 attached to the toroidal portion CB1 can be made uniform over the entire circumference, which is extremely advantageous in improving tire quality.

  Further, the cylindrical member 60 is formed so as to cover each roller 30 from the outside in the cylindrical body radial direction, and is formed so as to be elastically deformable in the cylindrical body radial direction. It is possible to urge toward the inner side in the radial direction, and omitting a dedicated member for urging each arm 20 toward the inner side in the cylindrical body radial direction like the elastic ring 20b of the first embodiment. it can.

  Furthermore, when the cylindrical body end side CB2 is attached to the toroidal portion CB1 by each roller 30, a cylindrical member 60 is provided between each roller 30 and the cylindrical body end side CB2, and the cylindrical shape is provided. Since the portion disposed between the rollers 30 in the member 60 is elastically deformed in the pulling direction, the cylindrical body end side CB2 at a position corresponding to each roller 30 is transformed into the toroidal portion CB1 by the pressing force of each roller 30. When pressed, the cylindrical body end side CB2 located between the rollers 30 is also pressed against the toroidal portion CB1 by the cylindrical member 60 that is elastically deformed. That is, compared with the case where the cylindrical member 60 is not provided, the cylindrical body end side CB2 can be uniformly pressed against the toroidal portion CB1 over the entire circumference, which is extremely advantageous in improving tire quality.

  Further, since the cylindrical member 60 is formed from a material having rubber-like elasticity, and the extension in the direction along each arm 20 is restricted by the reinforcing member 60a embedded therein, the cylindrical member 60 is Each roller 30 and each arm 20 can be flexibly bent between the cylindrical body end side CB2, and the cylindrical body end side CB2 can be smoothly attached to the toroidal portion CB1 by each roller 30. Further, since the cylindrical member 60 does not extend in the cylindrical body axis direction due to the contact resistance with each arm 20, the outer diameter of the end portion of the cylindrical body end side CB2 attached to the toroidal portion CB1 is set to the entire circumference. It is extremely advantageous to make it uniform over the entire area.

  In the first and second embodiments, each roller 30 is pressed against the inclination of the axial end surface of the holding mechanism 10 so that each roller 30 moves outward in the cylindrical body radial direction. Although shown, an arm rotation mechanism is provided for rotating each arm 20 outward in the cylindrical body radial direction when each roller 30 approaches the holding mechanism 10, so that each roller 30 does not contact the holding mechanism 10. It is also possible to directly press against the cylindrical body end side CB2.

Side surface sectional drawing of the principal part of the forming drum which shows 1st Embodiment in this invention. Operation diagram of molding drum Operation diagram of molding drum Front view of tubular body with tubular body end side attached to toroidal part Side surface sectional drawing of the principal part of the forming drum which shows the modification of 1st Embodiment. Explanatory drawing of operation | movement of the forming drum which shows the modification of 1st Embodiment. Side surface sectional drawing of the principal part of the forming drum which shows 2nd Embodiment in this invention. Operation diagram of molding drum Operation diagram of molding drum Side sectional view of the main part of a conventional molding drum Operation explanatory diagram of conventional molding drum Operation explanatory diagram of conventional molding drum Front view of tubular body with tubular body end side attached to toroidal part

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Support shaft, 2 ... Drive shaft, 10 ... Holding mechanism, 11 ... Bead lock member, 12 ... Holding mechanism main body, 13 ... Piston, 20 ... Arm, 20a ... Hook, 20b ... Elastic body ring, 30 ... Roller, 40 ... support member, 40a ... projection, 40b ... first air chamber, 40c ... second air chamber, 41 ... movable member, 50 ... strip member, 50a ... reinforcing member, 51 ... wire, 52 ... elastic mechanism, 55 ... strip member 55a ... reinforcing member, 60 ... cylindrical member, 60a ... reinforcing member, 60b ... ring-like member, 61 ... wire, 62 ... elastic mechanism, CB ... cylindrical body, CB1 ... toroidal part, CB2 ... end of cylindrical body Side, BE ... Bead member.

Claims (5)

A pair of holding mechanisms for holding each bead member from the radially inner side of the cylindrical body in a state where the pair of bead members are arranged at predetermined positions in the axial direction on the outer peripheral surface side of the cylindrical body made of unvulcanized rubber; ,
Forming means for forming the cylindrical body between the holding mechanisms in a toroidal shape while moving the holding mechanisms so as to approach each other in the cylindrical body axis direction;
A plurality of arms provided to be arranged in the cylindrical body circumferential direction on the outer side in the cylindrical body axial direction with respect to each holding mechanism;
A support mechanism that rotatably supports the other end side so that one end side moves in the cylindrical body radial direction, and supports each arm movably to the holding mechanism side;
A plurality of rollers rotatably supported at one end of each arm;
Each bead member is held by each holding mechanism, and each arm is moved to the holding mechanism side by the support mechanism in a state where the cylindrical body between the holding mechanisms is formed in a toroidal shape by the forming means. Each of the rollers is pressed against the holding mechanism or the cylindrical body, and each roller moves toward the outer side in the cylindrical body radial direction, and is disposed outside the bead member in the cylindrical body axial direction. In the forming drum that is attached to the toroidal part that is formed into a toroidal shape by folding the end side around the bead member by each roller,
A plurality of belt-shaped members that are in contact with the respective rollers from the outside in the cylindrical body radial direction and are formed so as to extend along the respective arms and are movable to the holding mechanism side with respect to the respective arms,
Each belt-like member is configured to be interposed between each roller and each arm and the cylindrical body end side when the cylindrical body end side is attached to the toroidal portion by each roller. Forming drum. 2. The belt-like member according to claim 1, wherein each of the belt-like members is made of a rubbery elastic material, and the extension in a direction along each arm is regulated by a reinforcing member embedded therein. Molding drum. 3. The forming drum according to claim 1, wherein each of the band-shaped members is formed such that a thickness dimension changes in a direction along each arm in accordance with a shape on a toroidal portion or a cylindrical body end side. . A pair of holding mechanisms for holding each bead member from the radially inner side of the cylindrical body in a state where the pair of bead members are arranged at predetermined positions in the axial direction on the outer peripheral surface side of the cylindrical body made of unvulcanized rubber; ,
Forming means for forming the cylindrical body between the holding mechanisms in a toroidal shape while moving the holding mechanisms so as to approach each other in the cylindrical body axis direction;
A plurality of arms provided to be arranged in the cylindrical body circumferential direction on the outer side in the cylindrical body axial direction with respect to each holding mechanism;
A support mechanism that rotatably supports the other end side so that one end side moves in the cylindrical body radial direction, and supports each arm movably to the holding mechanism side;
A plurality of rollers rotatably supported at one end of each arm;
Each bead member is held by each holding mechanism, and each arm is moved to the holding mechanism side by the support mechanism in a state where the cylindrical body between the holding mechanisms is formed in a toroidal shape by the forming means. Each of the rollers is pressed against the holding mechanism or the cylindrical body, and each roller moves toward the outer side in the cylindrical body radial direction, and is disposed outside the bead member in the cylindrical body axial direction. In the forming drum that is attached to the toroidal part that is formed into a toroidal shape by folding the end side around the bead member by each roller,
Each roller is formed in a cylindrical shape covering the outer side in the cylindrical body radial direction, is formed to extend along each arm, is formed to be elastically deformable in the cylindrical body radial direction, and In contrast, a cylindrical member provided movably on the holding mechanism side is provided,
The cylindrical member is configured to be interposed between each roller and each arm and the cylindrical body end side when the cylindrical body end side is attached to the toroidal portion by each roller. Molding drum. The cylindrical member is formed of a material having rubber-like elasticity, and is configured such that extension in a direction along each arm is restricted by a reinforcing member embedded therein. Molding drum.

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