JP5585380B2 - Rubber member turn-up device and method - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a rubber member turn-up device and method, and more specifically, when manufacturing a pneumatic tire, the end in the width direction of the rubber member that has been turned up is stably and reliably crimped to the opposing rubber member. The present invention relates to an apparatus and method for turning up a rubber member.

  When manufacturing a pneumatic tire, the end of the rubber member such as a carcass wound around a molding drum in the width direction is folded back so as to wrap the bead member and pressed against the opposing rubber member to perform green so-called turn-up. Mold the tire. As a method for this turn-up, there are known a method in which an end portion of a rubber member is folded back by an expanding turn-up bladder (bladder method) and a method in which a rubber body is folded back by a push-up lever (mechanical method). Since the bladder method uses a bladder that is easily deformed during pressure bonding, in the case of a highly rigid rubber member, the end of the folded rubber member cannot be sufficiently crimped to the opposing rubber member. If the rubber members cannot be sufficiently crimped, the quality of the tire to be manufactured will be adversely affected.

  On the other hand, the mechanical system uses a rigid push-up lever that does not deform, so it is more advantageous than the bladder system to turn up the end of a high-rigidity rubber member and crimp the opposing rubber members together. (For example, refer to Patent Document 1). However, in the mechanical method, the end of the rubber member that has been turned up is pressed by the pressure roller provided at the tip of the push-up lever, and is pressed against the opposite rubber member. When is large, the pressing force by the pressure roller becomes excessive. On the other hand, when the pressure roller is advanced and the pressure bonding of the rubber member proceeds, the resistance of the rubber member may suddenly decrease. In this case, the pressing force by the pressure roller becomes too small and sufficient pressure bonding can be performed. There was no problem.

  In Patent Document 1, a cam roller is provided in the middle of a push-up lever (finger), the cam member is moved, and the cam roller is brought into contact with the inclined surface of the cam member, whereby the push-up lever is expanded in diameter and both end portions of the rubber member. Is turned up (see paragraphs 0014 to 0015, FIG. 4 and the like). However, the cam roller and the cam member are only used when the end of the rubber member starts to be folded back, and do not function at all when the end of the folded rubber member is pressed against the opposing rubber member. . That is, also in the present invention, the pressure roller provided at the tip of the push-up lever has a structure in which the rubber member simply turned up is pressed and pressed against the opposing rubber member. Therefore, there is a problem that the degree of pressure bonding varies depending on the magnitude of the resistance of the rubber member to the pressure roller during pressure bonding.

JP-A-9-309159

  An object of the present invention is to provide a rubber member turn-up device and method capable of stably and reliably crimping a width-direction end portion of a turned-up rubber member to an opposing rubber member when manufacturing a pneumatic tire. Is to provide.

  In order to achieve the above object, the rubber member turn-up device according to the present invention includes a bead set portion provided at a predetermined position in the drum axial direction of the molding drum along the drum circumferential direction, and an annular shape at a predetermined pitch in the circumferential direction of the molding drum. A plurality of push-up levers arranged on the drum, and the rear ends of the push-up levers arranged on the outer side in the drum axis direction from the bead set portion are attached to the forming drum so as to be movable in the drum axis direction. In a rubber member turn-up device in which a tip end portion of a push-up lever is movable in the drum radial direction with the end portion as a rotation center, a guide roller is provided in the longitudinal direction of the push-up lever and extends in the drum axial direction A guide portion is provided, and the surface shape of the guide portion is set to a shape determined according to the shape of the green tire to be molded. When the portion is moved in the drum axis direction, the guide roller is brought into contact with the surface of the guide portion and moved along the surface, thereby controlling the movement locus of the tip portion of the push-up lever. The end portion of the rubber member wound around the molding drum is turned up so as to wrap the bead member locked by the bead set portion by the tip end portion of the push-up lever, and the internal pressure is applied. It is characterized in that it is configured to be pressure-bonded to the rubber member.

  According to the rubber member turn-up method of the present invention, a pair of bead members and a rubber member disposed between the bead members are installed so as to be fitted on the molding drum, and then each bead member is attached to the molding drum. Locked by a bead set portion provided in the drum circumferential direction at a predetermined position along the drum circumferential direction, and then a plurality of push-up levers arranged annularly at a predetermined pitch in the circumferential direction of the forming drum, and the rear end portion of the drum shaft By turning the rear end portion about the rotation center while moving in the direction, the end portion in the width direction of the rubber member is turned up so as to wrap the bead member by the front end portion of the push-up lever, and faces each other. In a rubber member turn-up method for pressure bonding to a rubber member, a guide portion having a surface shape determined according to the shape of a green tire to be formed is extended in the drum axial direction. When the rear end portion of the push-up lever is moved in the drum axis direction, a guide roller provided in the middle of the push-up lever in the longitudinal direction is brought into contact with the surface of the guide portion along the surface. By moving, while controlling the movement locus of the tip of the push-up lever, the end in the width direction of the rubber member is turned up and pressed against the opposing rubber member to which internal pressure is applied. .

  According to the present invention, when the rear end portion of the push-up lever is moved in the drum axis direction, the push-up lever is placed on the surface of the guide portion having the surface shape determined according to the shape of the green tire to be molded. By controlling the movement trajectory of the tip of the push-up lever by turning a guide roller provided in the middle in the longitudinal direction and moving along the surface, the end in the width direction of the rubber member is turned up, Since the pressure is applied to the opposing rubber member to which the internal pressure is applied, if the surface shape of the guide portion is appropriately set, the movement locus of the tip portion of the push-up lever suitable for the shape of the green tire to be molded can be obtained. As a result, regardless of the magnitude of the resistance of the rubber member against the tip of the push-up lever when the rubber member is turned up and crimped, the end of the rubber member that has been turned up is stably over and over the opposing rubber member. It becomes possible to make it press-fit reliably.

  In the rubber member turn-up device according to the present invention, the plurality of push-up levers are connected to an electric actuator provided with a control device, and the push-up levers are arbitrarily arranged in the drum axis direction at arbitrary positions in the drum axis direction. It can also be configured to move at a speed of Thereby, it becomes possible to adjust in detail the crimping | compression-bonding condition of the width direction edge part of the rubber member which turned up. Therefore, it is possible to perform a more stable and reliable crimping operation according to a slight difference in characteristics (rigidity, etc.) of the rubber member.

  In addition, a plurality of types of guide portions having different surface shapes that are detachable between the outer peripheral surface of the molding drum and the push-up lever are provided, and one type selected from these guide portions according to the shape of the green tire to be molded It is also possible to adopt a configuration in which the guide part is mounted. Thereby, it is possible to respond quickly to molding of a plurality of types of green tires having different shapes by simply replacing the guide portion.

  A cylindrical rubber cover is provided to cover the outer peripheral side of the push-up lever arranged in an annular shape, and when turning up with the tip of the push-up lever, the tip of the push-up lever and the end of the rubber member in the width direction The rubber cover may be interposed between the two. Thereby, since the pressure-bonding force by the tip of the push-up lever can be dispersed by the rubber cover, it is advantageous for preventing local deformation of the rubber member. In addition, the number of push-up levers can be easily reduced.

It is a drum axial direction sectional view which illustrates the principal part of the turn-up device of the present invention. It is explanatory drawing which illustrates the state which attaches and detaches the guide part of FIG. It is explanatory drawing which illustrates the state which started turning up the width direction edge part of the rubber member of FIG. It is explanatory drawing which illustrates the state which further turned up the edge part of the width direction of the rubber member of FIG. FIG. 5 is a view as viewed in the direction of arrow A in FIG. 4 exemplifying an upper half portion of a plurality of push-up levers arranged in an annular shape by cutting out a part of a rubber cover.

  Hereinafter, a rubber member turn-up device and method according to the present invention will be described based on the embodiments shown in the drawings.

  A rubber member turn-up device 1 (hereinafter referred to as a turn-up device 1) of the present invention illustrated in FIGS. 1 to 4 is attached to a molding drum 12, and left and right with respect to the drum axial center of the molding drum 12. Since it has a pair of symmetrical structures, only one turnup device 1 on the one side (right side) of the pair will be shown in the drawing.

  As illustrated in FIG. 1, the turn-up device 1 is a mechanical system including a plurality of push-up levers 5, and includes a plurality of push-up levers 5 and a bead setting unit 2. The bead setting unit 2 is provided at a predetermined position in the drum axis direction of the forming drum 12 along the drum circumferential direction.

  The bead setting unit 2 extends and contracts to cover the surface of the mounting unit 3, the lock unit 4 provided at the inner side in the drum axis direction of the mounting unit 3, and the mounting unit 3 and the locking unit 4. It is comprised with the coating | coated part 3b which has property. That is, one end portion of the covering portion 3b is fixed to the placement portion 3 by a placement portion cover rubber 3a fitted in a fitting groove formed on the surface of the placement portion 3, and the other end portion is a lock portion. 4 is fixed by being sandwiched between a lock guide portion 4a disposed on the inner side in the drum axis direction and a clamp fixed to the lock guide portion 4a by bolts.

  The lock portion 4 disposed between the placement portion 3 and the lock guide portion 4a moves in the drum radial direction so as to be orthogonal to the drum axis direction. The lock portion 4 moves independently in the drum radial direction independently of the placement portion 3 and the lock guide portion 4a. By moving the lock portion 4 outward in the drum radial direction, the bead member 14 (bead 14a) placed on the placement portion 3 is locked. In addition, the bead setting part 2 is not limited to the structure shown in this embodiment, The various structure which can lock the bead member 14 (bead 14a) is employable.

  As illustrated in FIG. 5, the push-up lever 5 is annularly arranged at a predetermined pitch in the circumferential direction of the forming drum 12, and is formed of a rigid material such as various metals or hard resin. In this embodiment, twelve push-up levers 5 bent in a zigzag manner at equal intervals in the circumferential direction are provided, but the number of installation levers is not limited to this and can be determined as appropriate. For example, about 8 to 36 push-up levers 5 are installed at equal intervals in the drum circumferential direction.

  A pressure roller 5a is rotatably installed at the front end of the push-up lever 5, and the rear end is a support shaft 5b. The support shaft 5b is disposed outside the bead set portion 2 in the drum axis direction, and is attached to the forming drum by the slide mechanism 10 so as to be movable in the drum axis direction. With the support shaft 5b as the center of rotation, the tip of the push-up lever 5 is movable in the drum radial direction.

  A regulating rubber band 9 is fitted on the push-up lever 5. The regulation rubber band 9 regulates inadvertent outward rotation of the push-up lever 5.

  The slide mechanism 10 includes an electric actuator 10 a including a control device 11. Thereby, each push-up lever 5 can be moved at an arbitrary speed in the drum axis direction at an arbitrary position in the drum axis direction by the electric actuator 10a and the control device 11.

  A rotatable guide roller 6 a is provided in the longitudinal direction of the push-up lever 5. Unlike the pressure roller 5a, the guide roller 6a does not contact the rubber member 13 to be pressure bonded.

  The base portion 1 a of the turn-up device 1 is provided with a guide portion 6 b that bends and extends in the drum axis direction so as to be positioned on the inner peripheral side of the push-up lever 5. The guide portion 6b is formed of a rigid material such as various metals or hard resin.

  The guide portion 6b is detachably fixed to the base portion 1a with a bolt or the like. The surface shape of the guide portion 6b is set to a shape determined according to the shape of the green tire to be molded.

  It is preferable to prepare a plurality of types of guide portions 6b having different surface shapes. As a result, when molding green tires having different shapes, one type of guide portion 6b selected according to the shape of the green tire to be molded is mounted on the base portion 1a from among a plurality of types of prepared guide portions 6b. do it. In this way, it is possible to quickly cope with the molding of a plurality of types of green tires having different shapes by simply replacing the guide portion 6b.

  The turn-up device 1 of this embodiment is further provided with a cylindrical rubber cover 8 that covers the outer peripheral side of the push-up lever 5. Specifically, the front end portion of the rubber cover 8 is fixed to the bead set portion 2, and the rear end portion is the front end of the rubber cover holding portion 8 a erected on the moving guide 10 b that moves together with the support shaft 5 b of the push-up lever 5. It is fixed to.

  The rear end portion of the rubber cover 8 can be easily attached and detached by a clamp 8b provided at the tip of the rubber cover holding portion 8a. Therefore, when exchanging the guide portion 6b, as illustrated in FIG. 2, the rear end portion of the rubber cover 8 can be removed from the clamp 8b, and the replacement operation can be performed with the rubber cover 8 turned up. .

  Hereinafter, the procedure of the method for turning up the rubber member 13 using the turn-up device 1 will be described.

  First, as illustrated in FIG. 1, a rubber member 13 that is a constituent member of a pneumatic tire is wound around the outer peripheral surface of the molding drum 12. Specifically, the rubber member 13 is an inner liner, a carcass material, a side rubber, or the like. Next, the ring-shaped bead member 14 is set so as to be externally fitted to the outer peripheral position of the bead set portion 2 which is a predetermined position of the end portion in the width direction of the rubber member 13 wound around the molding drum 12. The bead member 14 includes a bead 14a and a bead filler attached to the outer periphery of the bead 14a.

  The setting process of the bead member 14 will be described in detail. The bead member 14 is set by placing the bead 14a on the mounting portion 3 covered with the set rubber portion 3a integrated with the covering portion 3b. For example, the mounting portion 3 can be configured to be movable in the drum radial direction, and the mounted bead member 14 can be locked by moving the mounting portion 3 outward in the drum radial direction. Both end portions in the width direction of the rubber member 13 wound around the forming drum 12 extend outward in the drum axial direction from the bead set portion 2, and the extended portions are in a state of being placed on the rubber cover 8.

  As illustrated in FIG. 1, when the bead 14 a is placed on the placement portion 3, the lock portion 4 is protruded outward in the drum radial direction from the placement portion 3. Then, as illustrated in FIG. 3, by moving at least one of the bead set portions 2 in the drum axial direction, the distance between the pair of bead set portions 2 is reduced, and an internal pressure is applied, thereby a pair of bead sets. The rubber member 13 between the members 14 is expanded.

  Then, the support shaft 5b of the push-up lever 5 is moved inward in the drum axis direction by the slide mechanism 10. Thereby, the guide roller 6a contacts the surface of the guide part 6b and moves along this surface. Along with this, the pressure roller 5a rotates around the support shaft 5b, and the push-up lever 5 starts to spread radially. Both ends of the rubber member 15 in the width direction start to be turned up by the pressure roller 5 with the cover rubber 8 interposed between the pressure roller 5a.

  In this embodiment, the amount of swelling of the rubber member 13 is restricted by the restriction ring 7. Thereby, since the rubber member 13 and the bead member 14 are supported more strongly from the inside, it is easy to strongly pressure-bond both ends in the width direction of the rubber member 13 that has been turned up. Instead of the regulating ring 7, a shoulder support that supports the rubber member 13 and the bead member 14 may be provided by expanding the diameter inside the rubber member 13 that bulges when an internal pressure is applied.

  Subsequently, as illustrated in FIG. 4, the push-up lever 5 (support shaft 5b) is moved inward in the drum axis direction. As a result, both ends in the width direction of the rubber member 13 that has been turned up are pressed against the opposing rubber member 13 and the bead member 14 by the pressing roller 5a so as to wrap the bead member 14 locked by the bead setting portion 2.

  After turning up and forming the intermediate green tire in this way, a belt member and a tread rubber are bonded to the outer peripheral surface of the intermediate green tire to complete the green tire.

  In the present invention, by moving the guide roller 6a along the surface of the guide portion 6 whose surface shape is determined according to the shape of the green tire to be molded, the rubber member is controlled while controlling the movement locus of the pressure roller 5b. The width direction end part of 13 is turned up and it is made to crimp | bond to the opposing rubber member 13 which has expanded by the internal pressure. Therefore, by appropriately setting the surface shape of the guide portion 6b, it is possible to obtain a movement locus of the pressure roller 5a suitable for the shape of the green tire to be molded.

  The present invention is not a method in which the rubber member 13 is positively pressed and pressure-bonded by the pressure-bonding roller 5a, but the rubber member 13 is pressed against the distal end portion (pressure-bonding roller 5a) of the push-up lever 5 that draws a certain movement path. The rubber member 13 is pressed against the tip of the push-up lever 5 by the internal pressure applied to the push lever 5.

  Regardless of the magnitude of the resistance of the rubber member 13 with respect to the pressure roller 5a that is generated when the pressure is turned up, the movement locus of the pressure roller 5a is determined by the surface shape of the guide portion 6b. Both end portions in the width direction can be securely and reliably crimped to the opposing rubber member 13 without excess or deficiency as set.

  In this embodiment, the push-up lever 5 can be moved at any speed in the drum axis direction at any position in the drum axis direction by the electric actuator 10a provided with the control device 11, so that the rubber member turned up It becomes possible to adjust the crimping | compression-bonding condition of 13 width direction edge parts in detail. Therefore, the pressure bonding operation can be performed more stably and reliably in accordance with the slight difference in the characteristics (rigidity, etc.) of the rubber member 13 and the shape of the green tire to be molded. Further, the degree of pressure bonding can also be adjusted by changing the magnitude of the internal pressure applied to the rubber member 13.

  When the rubber cover 8 is installed, the pressure force applied to the rubber member 13 by the pressure roller 5a can be dispersed, which is advantageous in preventing local deformation of the rubber member 13. In addition, since the rubber member 13 that has been turned up can be easily crimped uniformly in the circumferential direction by a smaller number of the pressing rollers 5a, it is advantageous for reducing the number of the push-up levers 5. Furthermore, the cover rubber 8 can prevent the push-up lever 5 from being accidentally rotated outward.

  The rubber member 13 can also be turned up directly at the tip of the push-up lever 5 (the pressure roller 5a) without the rubber cover 8. Further, a configuration in which the pressure roller 5a is omitted may be employed.

  In addition, the present invention includes a cylindrical molded bladder, a pair of bladder holding portions attached to both ends of the molded bladder, and a variable interval mechanism for changing the interval between the bladder holding portions, and a green tire is provided on the outer peripheral surface. The present invention can also be applied when a green tire is molded using a molding unit (see Japanese Patent Application Laid-Open No. 2007-98803) that is placed in a vulcanization mold while attached.

DESCRIPTION OF SYMBOLS 1 Turn-up device 1a Base part 2 Bead set part 3 Place part 3a Set rubber part 3b Cover part 4 Lock part 4a Lock guide part 5 Push-up lever 5a Pressure roller 5b Support shaft 6a Guide roller 6b Guide part 7 Restriction ring 8 Rubber Cover 8a Rubber cover holding portion 8b Clamp 9 Regulating rubber band 10 Slide mechanism 10a Electric actuator 10b Movement guide 11 Controller 12 Molding drum 13 Rubber member 14 Bead member 14a Bead

Claims (5)

A bead set portion provided along a drum circumferential direction at a predetermined position in the drum axial direction of the molding drum, and a plurality of push-up levers arranged annularly at a predetermined pitch in the circumferential direction of the molding drum. The rear end of these push-up levers arranged on the outer side in the drum axial direction is attached to the forming drum so as to be movable in the drum axial direction, and the front end of the push-up lever is used as the center of rotation in the drum radial direction. In the rubber member turn-up device that can be moved to
A guide roller is provided midway in the longitudinal direction of the push-up lever, a guide portion extending in the drum axis direction is provided, and the surface shape of this guide portion is set to a shape determined according to the shape of the green tire to be molded, When the rear end portion of the push-up lever is moved in the drum axis direction, the guide roller is brought into contact with the surface of the guide portion and moved along the surface to thereby move the tip end portion of the push-up lever. While controlling the movement trajectory, the end portion of the rubber member wound around the molding drum is turned up so that the bead member locked by the bead set portion is wrapped by the tip portion of the push-up lever. A turn-up device for a rubber member, characterized in that the rubber member is pressed against an opposing rubber member to which an internal pressure is applied.   The plurality of push-up levers are connected to an electric actuator having a control device, and the push-up levers can be moved at any speed in the drum axis direction at any position in the drum axis direction. The rubber member turn-up device according to claim 1.   A plurality of types of the guide portions having different surface shapes that are detachable between the outer peripheral surface of the molding drum and the push-up lever are provided, and one type selected according to the shape of the green tire to be molded from these guide portions. The rubber member turn-up device according to claim 1 or 2, wherein the guide portion is mounted.   A cylindrical rubber cover is provided to cover the outer peripheral side of the push-up lever arranged in an annular shape, and when turning up with the tip of the push-up lever, the tip of the push-up lever and the end of the rubber member in the width direction The rubber member turn-up device according to claim 1, wherein the rubber cover is interposed between the rubber member and the rubber member. After a pair of bead members and a rubber member disposed between the bead members are installed so as to be externally fitted to the molding drum, the respective bead members are arranged at predetermined positions in the drum axial direction of the molding drum along the drum circumferential direction. Next, a plurality of push-up levers arranged annularly at a predetermined pitch in the circumferential direction of the forming drum are locked with a bead set portion provided, and the rear end portion is rotated while moving the rear end portion in the drum axial direction. A rubber member turn-up method in which the end in the width direction of the rubber member is turned up so as to wrap the bead member by the tip of the push-up lever by rotating as a moving center, and the rubber member is pressure-bonded to the opposing rubber member In
When the guide portion having a surface shape determined according to the shape of the green tire to be molded is extended in the drum axis direction and the rear end portion of the lift lever is moved in the drum axis direction, the lift lever The width of the rubber member is controlled while controlling the movement locus of the tip of the push-up lever by moving a guide roller provided in the middle of the longitudinal direction of the guide roller in contact with the surface of the guide portion and moving along the surface. A method for turning up a rubber member, characterized in that a direction end portion is turned up and pressed against an opposing rubber member to which an internal pressure is applied.

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