JP5256920B2 - Rubber member turn-up device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a rubber member turn-up device, and more particularly, a rubber member turn-up device that can securely attach an end portion of a rubber member folded so as to wrap a bead member to an opposing bead member or rubber member. It relates to the device.

  When forming a pneumatic tire, a bead member is set so as to be externally fitted at a predetermined position of an end of a rubber member such as a carcass layer wound around a forming drum, and the bead member is set so as to wrap the bead member. A so-called turn-up process is performed in which the end of the rubber member in the outer region in the drum axis direction than the position is pressed against the inflated rubber member in the inner region in the drum axis direction.

  As a turn-up method, the end of the rubber member in the range outside the drum axis direction from the set position of the bead member is folded and pressed by an expanding bladder (bladder method), and the end is turned back by a rigid lifting lever. A pressing method (mechanical method) is known. Since the bladder method uses a bladder that is easily deformed when pressed, in the case of a highly rigid rubber member, the end of the rubber member is folded back so as to wrap the bead member so that the bead member and the rubber member are sufficiently adhered to each other. I can't. As described above, if there is a gap between the two without sufficiently adhering, the quality of the manufactured tire is adversely affected.

On the other hand, in the mechanical method, when the end of the folded rubber member is pressed, a rigid push-up lever that does not deform is used. Therefore, it is more advantageous than the bladder method to turn up a highly rigid rubber member. (For example, refer to Patent Document 1). However, the pressing force of the lifting lever is due to an elastic restoring force of a rubber band or the like attached so as to be fitted around a plurality of lifting levers arranged in the drum circumferential direction. There were limits. Therefore, in the vicinity of the base portion of the bead member having relatively high rigidity, the end of the folded rubber member cannot be strongly pressed, so that it is suitable for the rigidity and shape of the opposing bead member or rubber member, There has been a problem that it is difficult to securely adhere the end of the folded rubber member.
JP 2003-80612 A

  An object of the present invention is to provide a rubber member turn-up device capable of reliably bringing an end portion of a rubber member folded so as to wrap the bead member into close contact with the bead member or the rubber member.

  In order to achieve the above object, the rubber member turn-up device of the present invention is provided at a predetermined position in the drum axial direction of the molding drum along the drum circumferential direction, and at a predetermined pitch in the circumferential direction of the molding drum. A plurality of push-up levers, and rear end portions of these push-up levers arranged on the outer side in the drum axis direction than 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 can be moved in the drum radial direction as a rotation center, a cylindrical restricting body made of a rigid material inserted by the plurality of push-up levers is provided. The shape restricting body is connected to an electric actuator equipped with a control device, and can be moved at an arbitrary speed in the drum axis direction at an arbitrary position in the drum axis direction. Is shall.

  Here, the plurality of push-up levers are connected to an electric actuator provided with 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. You can also. As the cylindrical regulating body, a plurality of cylindrical regulating bodies having different inner diameters can be provided so as to be replaceable.

  According to the present invention, a cylindrical restricting body made of a rigid material inserted by a plurality of push-up levers provided at a predetermined pitch in the circumferential direction of the forming drum is provided, and the cylindrical restricting body is electrically operated with a control device. Since it can be connected to the actuator and moved at any speed in the drum axis direction at any position in the drum axis direction, the drum at the tip of the push-up lever can be changed by changing the position of the cylindrical regulator in the drum axis direction. The amount of movement outward in the radial direction can be regulated and changed, whereby the pressing force at the end of the folded rubber member can be accurately adjusted. For example, the pressing force can be increased by moving the cylindrical restricting body toward the tip of the push-up lever to reduce the amount of movement of the tip of the push-up lever to the outside in the drum radial direction. In this manner, the folded rubber member can be reliably brought into close contact with the opposite bead member or the rigidity and shape of the rubber member.

  Hereinafter, a rubber member turn-up device of the present invention will be described based on an embodiment shown in the drawings, taking as an example the case of molding a pneumatic tire.

  The rubber member turn-up device 1 (hereinafter referred to as “turn-up device 1”) of the present invention illustrated in FIGS. 1 to 3 has a pair of symmetrical structures with respect to the center of the forming drum 11 in the drum axial direction. In the drawings, only the turn-up device 1 on one side (right side) of the pair is shown and described.

  This turn-up device 1 is a so-called mechanical turn-up device including a bead setting unit 2 and a plurality of push-up levers 5. A bead set unit 2 installed along a drum circumferential direction at a predetermined position in the drum axial direction of the forming drum 11 includes a mounting unit 3 and a pressing unit 4 provided at an inner position in the drum axial direction of the mounting unit 3. And a covering material 9 having stretchability covering these surfaces across the placement portion 3 and the pressing portion 4. That is, one end portion of the covering material 9 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 pressing portion. 4 is fixed by being sandwiched between a guide portion 4a disposed on the inner side in the drum axis direction and a clamp bolted to the guide portion 4a.

  The pressing portion 4 disposed between the placing portion 3 and the guide portion 4a moves in the drum radial direction so as to be orthogonal to the drum axial direction. In addition, the holding | suppressing part 4 moves independently in the drum radial direction independently of the mounting part 3 and the guide part 4a.

  Each push-up lever 5 is formed of a rigid material such as various metals or hard resin. A pressure roller 5a is provided at the front end of the push-up lever 5, and the rear end is connected to a slide mechanism 6 that is supported by a support shaft 5b and moves in the drum shaft direction. As illustrated in FIG. 3, two types of push-up levers 5 having different lengths are arranged in the drum circumferential direction. The push-up levers 5 are provided, for example, at an equal pitch with a center angle of about 2 ° to 5 ° in the drum circumferential direction.

  This slide mechanism 6 has an electric actuator 6 a provided with a control device 10. 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 connected electric actuator 6a and the control device 10.

  Moreover, the cylindrical control body 7 is provided so that each push-up lever 5 installed at a predetermined pitch in the drum circumferential direction may be inserted. The cylindrical regulating body 7 is made of a rigid material that does not easily deform, such as various metals such as steel (stainless steel, etc.), aluminum alloy, and hard resin. The cylindrical restricting body 7 is open at both ends and has a circular cylindrical inner peripheral surface, and the inner diameter thereof is the state before turning up, that is, each push-up before the tip is expanded. It is set to have a certain gap with respect to the outer peripheral surface of the lever 5.

  When the distal end portion (pressing roller 5a) of the push-up lever 5 rotates about the support shaft 5b and moves outward in the drum radial direction, the cylindrical restricting body 7 is pushed up by a predetermined amount. 5 is abutted against the rear surface of 5 and restricts the movement of the tip of the push-up lever 5 outward in the drum radial direction. In this embodiment, the abutting portion 7a of the cylindrical regulating body 7 that abuts on the push-up lever 5 has a curved surface (a semicircular cross section).

  The cylindrical regulating body 7 is connected to a slide mechanism 8 that moves in the drum axis direction. The slide mechanism 8 has an electric actuator 8 a provided with a control device 10. Thereby, the cylindrical regulating body 7 can be arbitrarily moved in the drum axis direction at an arbitrary position in the drum axis direction with the push-up levers 5 inserted by the connected electric actuator 8a and the control device 10. You can move at a speed of. In this embodiment, the push-up lever 5 and the cylindrical regulating body 7 are configured to be controlled by the same control device 10, but each can be controlled by another control device 10.

  The inner diameter of the cylindrical restricting body 7 is appropriately set depending on the pressing force required for the end of the folded rubber member 12 and the tire size. It is preferable to prepare a plurality of sizes of cylindrical regulating bodies 7 having different inner diameters and replace them with the electric actuator 8a. Thereby, when manufacturing tires of various sizes, it is possible to quickly turn up the cylindrical regulating body 7 having the optimum size for the tire by attaching it to the electric actuator 8a. Further, the cylindrical regulating body 7 may be a cylindrical body whose inner diameter is increased toward the inner side in the drum axial direction, for example.

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

  First, as illustrated in FIG. 1, the rubber member 12 is wound around the outer peripheral surface of the molding drum 11. In tire manufacture, the rubber member 12 is an inner liner, a carcass material, a side rubber, or the like. Next, the ring-shaped bead member 13 is set so as to be fitted around the outer peripheral position of the bead set portion 2 which is a predetermined position of the end portion of the rubber member 12 wound around the molding drum 11. More specifically, the bead portion 13a of the bead member 13 is placed on the placement portion 3 covered with the placement portion cover rubber 3a integrated with the covering material 8, and the bead member 13 is set. For example, the mounting portion 3 is configured to be movable in the drum radial direction, and the bead member 13 is mounted by moving the mounting portion 3 outward in the drum radial direction. In tire manufacture, the bead member 13 is a bead portion 13a and a bead filler attached to the outer periphery of the bead portion 13a.

  As illustrated in FIG. 2, when the bead portion 13 a is placed on the placement portion 3, the pressing portion 4 is protruded outward in the drum radial direction from the placement portion 3. Then, the pair of bead setting portions 2 are moved in the drum axial direction so that they are close to each other, and the central portion in the drum axial direction of the rubber member 12 is inflated. Further, the slide mechanism 6 is moved inward in the drum axis direction. Along with this, the rear end portion of the push-up lever 5 moves inward in the drum axis direction, and the tip portion of the push-up lever 5 rotates around the support shaft 5b to inflate. 12. Moves outward in the drum radial direction along the surface of the bead member 13, and the push-up lever 5 spreads radially as illustrated in FIG.

  Along with the movement of the push-up lever 5, the cylindrical regulating body 7 is moved inward in the drum axis direction by the slide mechanism 8, and the abutment portion 7 a is brought into contact with the back surface of the push-up lever 5 that spreads radially to push up. The movement of the lever 5 to expand the diameter is restricted. As a result, the pressing roller 5a that moves outward in the drum radial direction folds back the end portion of the rubber member 12 in the range outside the drum axial direction from the set position of the bead member 13 so as to wrap the bead member 13. Even when the rigidity of the rubber member 12 around the bead portion 13a serving as the base point for folding is high, the rigid push-up lever 5 is restricted by the cylindrical restricting body 7 made of a rigid material, so that the diameter expansion movement is restricted. The end of the rubber member 11 can be folded back. At this time, since the contact portion 7a is curved, the compressive stress generated in the push-up lever 5 can be relieved. Further, since the protruding pressing portion 4 prevents the bead portion 13a from being displaced in the drum axis direction, a much larger pressing force can be generated.

  Subsequently, by moving the push-up lever 5 inward in the drum axis direction, the folded rubber member 12 is pressed by the pressing roller 5a. Also at the time of this pressing, the electric actuator 8a and the control device 10 control the operation of the cylindrical restricting body 7 so that the contact portion 7a of the cylindrical restricting body 7 comes into contact with the back surface of the push-up lever 5. By appropriately adjusting, the folded rubber member 12 can be surely brought into close contact with the opposing bead member 13 and the rigidity and shape of the rubber member 12.

  For example, in a portion where a large pressing force is required, the cylindrical restricting body 7 is moved toward the tip of the lifting lever 5 (toward the pressing roller 5 a), and the contact portion 7 a is moved from the tip of the lifting lever 5. By controlling the distance to the contact position to be short, the amount of movement of the tip of the push-up lever 5 to be expanded toward the outside in the drum radial direction is reduced, and the pressing force can be increased. . Therefore, the rubber member 12 around the bead portion 13a having relatively high rigidity can be pressed by the push-up lever 5 (pressing roller 5a) and can be brought into close contact with the bead portion 13a without generating a gap. . On the other hand, in a portion where a large pressing force is unnecessary, control is performed so that the distance from the tip of the push-up lever 5 to the position where the contact portion 7a contacts is increased.

  Along with such movement control of the cylindrical regulating body 7, the pressing lever 5 is controlled to move at an arbitrary speed in the drum axis direction at an arbitrary position in the drum axis direction, thereby controlling the pressing force in more detail and with accuracy. It becomes possible to do.

  The slide mechanism 6 of the push-up lever 5 and the slide mechanism 8 of the cylindrical regulating body 7 are not only disposed so as to face each other with the molding drum 11 interposed therebetween as illustrated in FIG. 3, but also illustrated in FIG. Further, they can be arranged so as to overlap each other. According to this arrangement, the required space is reduced and the turn-up device 1 can be made compact.

  In the present invention, the rubber member 12 can be directly turned up by the push-up lever 5 without using the pressing roller 5a. Further, the present invention can be applied not only to the formation of a tire but also to the case where the end of the rubber member 12 is turned up so as to wrap the bead member 13 in a manufacturing process of a rubber product other than the tire.

It is a drum axial direction sectional view which illustrates the principal part of the turn-up device of the present invention. It is a drum axial direction sectional view which illustrates the turnup device which has turned up the rubber member of Drawing 1. FIG. 3 is a view as seen from an arrow A in FIG. 2 (showing an upper half portion of the drum). It is A arrow line view which shows the modification of the cylindrical control body of FIG. 2 (showing the drum upper half part).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Turn-up device 2 Bead set part 3 Placement part 3a Cover rubber part 4 Press part 4a Guide part 5 Push-up lever 5a Press roller 5b Support shaft 6 Slide mechanism 6a Electric actuator 7 Cylindrical regulating body 7a Contact part 8 Slide mechanism 8a Electric actuator 9 Coating material 10 Control device 11 Molding drum 12 Rubber member 13 Bead member 13a Bead part

Claims (3)

  A bead set portion provided at a predetermined position in the drum axial direction of the forming drum along the circumferential direction of the drum, and a plurality of push-up levers provided at a predetermined pitch in the circumferential direction of the forming drum. The rear end of these push-up levers arranged on the outside in the direction is attached to the forming drum so that it can move in the drum axis direction, and the front end of the push-up lever can be moved in the drum radial direction around this rear end In the rubber member turn-up device, a cylindrical restricting body made of a rigid material inserted by the plurality of push-up levers is provided, and the cylindrical restricting body is connected to an electric actuator provided with a control device. A rubber member turn-up device configured to be movable at an arbitrary speed in the drum axis direction at an arbitrary position in the drum axis direction.   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.   The rubber member turn-up device according to claim 1, wherein a plurality of sizes of cylindrical regulating bodies having different inner diameters are replaceable as the cylindrical regulating body.

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