JP2019202454A - Rubber member forming apparatus for tire - Google Patents

Abstract

To adjust easily a height of an affixing position according to an increase in a thickness of a wound body, when a tire rubber member is formed by winding a rubber material.SOLUTION: A rubber member 105 for a tire is formed by winding a long belt-like rubber material 4 on a molding drum 2. A drum holding machine 3 that rotatably holds the molding drum 2 includes a height adjusting means 51. The height adjusting means 51 adjusts a height position of an axis 2j of the molding drum 2 during winding according to a thickness increase amount ΔT of a winding body that is increased by winding the rubber material 4.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an apparatus for forming a rubber member for a tire that can be suitably used particularly for forming a tread rubber.

  The tread portion of a tire is generally formed using an annular tread ring provided with a tread rubber on the radially outer side of a cord reinforcing layer having a tire cord. The tread ring is formed by sequentially winding a cord ply material for a cord reinforcing layer and a rubber member for tread rubber on a cylindrical forming drum.

  Here, when the tread rubber, which is a rubber member for tires, is formed by one round winding of a thick belt-like rubber, the joint strength at both ends in the circumferential direction tends to cause a decrease in adhesive strength and uneven thickness. In addition, there is a problem in that air accumulation tends to occur at both ends of the cord reinforcing layer in the tire axial direction.

  Therefore, the present inventor has proposed to use a thin sheet-like member having a thickness of, for example, about 1 mm as a rubber member for tread rubber and to form a laminated structure in which the members are wound. However, in order to optimally apply the thin sheet-like rubber member from the servicer to the molding drum, it is necessary to adjust the height of the application position. In particular, when the rubber member is wound many times, the diameter of the outer peripheral surface of the wound body changes, so that the optimum height of the attaching position also changes every moment.

  At this time, when the servicer side is provided with a height adjustment function, the adjustment reference changes every moment according to the winding state, and there is a problem that adjustment / control becomes difficult.

  In addition, there exists the following patent document 1 as what gives a height adjustment function to the servicer side.

JP 2014-124929 A

  The present invention provides an apparatus for forming a rubber member for a tire that can easily adjust the height of a sticking position in accordance with an increase in the thickness of the wound body when forming a rubber member for a tire by winding rubber materials. The challenge is to do.

The present invention is a tire rubber member forming apparatus for forming a tire rubber member by winding a long band-shaped rubber material on a cylindrical molding drum,
A drum holder for rotatably holding the molding drum;
A servicer for supplying and pasting the rubber material to the molding drum;
The drum holder includes height adjusting means for adjusting the height position of the axis of the molding drum during winding according to the thickness increase amount of the winding body that is increased by winding the rubber material.

  In the tire rubber member forming apparatus according to the present invention, it is preferable that the height adjusting means includes a detection unit that detects the thickness increase amount.

  In the tire rubber member forming apparatus according to the present invention, the height adjusting means includes a drive unit that moves the molding drum up and down based on detection data of the thickness increase amount by the detection unit. preferable.

  In the present invention, the drum holder includes a height adjusting means. The height adjusting means adjusts the height position of the axis of the molding drum during winding according to the amount of increase in the thickness of the wound body that is increased by winding the rubber material.

  Therefore, even when the diameter of the outer peripheral surface of the wound body gradually changes due to the rolling of the rubber material, the attachment position by the servicer can be kept optimal. For example, a tire rubber member such as a tread rubber can be increased. Can be formed with quality. Further, since the height adjustment is performed not on the servicer side but on the drum holder side, adjustment and control can be easily performed.

It is a conceptual diagram which shows the case where the formation apparatus of the rubber member for tires of one Embodiment of this invention is employ | adopted as the tread ring formation line of an airless tire. It is a front view which shows a drum holding machine notionally. It is a side view which shows the servicer for rubber materials. It is a side view which shows the principal part of the servicer for rubber materials. (A), (B) is a perspective view which shows a cutting | disconnection means and a pressing means. (A), (B) is an enlarged view explaining the height adjustment of the forming drum by a height adjustment means. (A) is a side view of a cord ply servicer, and (B) is a diagram of a band ply formation state by a cord ply service surp viewed from above. (A), (B) is a side view which shows the formation state of the belt ply by the servicer for cord plies. It is a perspective view showing an airless tire. It is sectional drawing of a tread ring. It is a conceptual diagram which shows the formation process of a tread ring.

Hereinafter, embodiments of the present invention will be described in detail.
FIG. 1 conceptually shows a front view when a tire rubber member forming apparatus 1 (hereinafter simply referred to as a forming apparatus 1) according to the present embodiment is employed in a formation line L of a tread ring 102 for an airless tire. It is.

  As shown in FIG. 1, the forming apparatus 1 includes a drum holder 3 that rotatably holds a forming drum 2, and a rubber material servicer 5 that supplies and sticks a long belt-like rubber material 4 to the forming drum 2. And

  Then, as shown in FIG. 10, the forming apparatus 1 forms a rubber layer 8 that is a tire rubber member 105 in the tread ring 102 before vulcanization. In this example, the first rubber material 4A forms the first rubber layer 8A, the second rubber material 4B forms the second rubber layer 8B, and the third rubber material 4C forms the third rubber layer 8C. Is done.

  FIG. 9 shows an example of the airless tire 101. As shown in the figure, an airless tire 101 includes an already vulcanized tread ring 102 ′, a wheel 103 disposed concentrically on the inner side in the radial direction of the tread ring 102 ′, and the tread ring 102 ′ and the wheel 103. The spoke 104 is made of a resin material.

  The wheel 103 corresponds to a tire wheel of a pneumatic tire. The spoke 104 of the present example includes a plurality of spoke plates 104m extending inward and outward in the radial direction, and the spoke plates 104m are arranged with intervals in the tire circumferential direction. The spoke 104 is a resin molded body, and is integrally formed with the tread ring 102 ′ and the wheel 103 in this example.

  The tread ring 102 'is formed by vulcanizing and molding the tread ring 102 formed by the forming line L in a mold. The tread ring 102 corresponds to a tread portion of a pneumatic tire. In this example, as shown in FIG. 9, the tread ring 102 includes a rubber layer 8 (tire rubber member 105) made of the rubber material 4 and a cord ply 106. A cord reinforcing layer 107 is included.

  In this example, the cord reinforcing layer 107 includes a radially inner cord reinforcing layer 107i and a radially outer cord reinforcing layer 107o. Among these, the inner cord reinforcing layer 107i is formed of, for example, one band cord ply 106A. The band cord ply 106A of this example has a band cord that is spirally wound in the tire circumferential direction.

  The outer cord reinforcing layer 107o is formed of a plurality of belt cord plies 106B1 and 106B2 in this example. Each of the belt cord plies 106B1 and 106B2 has a belt cord that is inclined with respect to the tire circumferential direction at an angle of 10 to 45 °, for example. The belt cord of the belt cord ply 106B1 and the belt cord of the belt cord ply 106B2 are inclined at the same angle and in opposite directions with respect to the tire circumferential direction line.

  Of the rubber layer 8, the first rubber layer 8 </ b> A is disposed radially inward of the inner cord reinforcement layer 107 i and relieves stress concentration between the inner cord reinforcement layer 107 i and the spoke 104. The second rubber layer 8B is interposed between the inner cord reinforcing layer 107i and the outer cord reinforcing layer 107o, and increases the bending rigidity of the tread ring 102. The third rubber layer 8C is arranged on the outer side in the radial direction of the outer cord reinforcing layer 107o and constitutes a ground plane.

  FIG. 11 shows a process for forming the tread ring 102. This formation process includes the following steps S1 to S5.

  In step S1, the first rubber material 4A of the rubber material 4 is wound on the molding drum 2 inward and outward in the radial direction. Thereby, the first rubber layer 8A is formed.

  In step S2, a narrow strip of cord strip 108 (shown in FIG. 7B) is spirally wound on the first rubber layer 8A. As a result, the inner cord reinforcement layer 107i made of the band cord ply 106A of the cord plies 106 is formed.

  In step S3, the second rubber material 4B of the rubber material 4 is wound inward and outward in the radial direction on the inner cord reinforcing layer 107i. Thereby, the second rubber layer 8B is formed.

  In step S4, the belt cord plies 106B1 and 106B2 of the cord plies 106 are sequentially wound once around the second rubber layer 8B. As a result, the outer cord reinforcing layer 107o is formed.

  In step S5, the third rubber material 4C of the rubber material 4 is wound inward and outward in the radial direction on the outer cord reinforcing layer 107o. Thereby, the third rubber layer 8C is formed.

  Among these, steps S1, S3, and S5 are performed by a rubber material servicer 5 as shown in FIG. Steps S2 and S4 are performed by ply material servicers 7A and 7B. In FIG. 1, the order of movement of the drum holder 3 is schematically indicated by arrows.

  As the rubber material 4 (first to third rubber materials 4A to 4C), a thin wide band having a thickness of about 0.7 to 1.3 mm is preferably used.

  In this example, the first rubber material 4A and the third rubber material 4C have the same size and the same rubber composition. Therefore, the first rubber material 4A is used as the third rubber material 4C. On the other hand, the second rubber material 4B is different from the first rubber material 4A in both size and rubber composition. In this example, the first and third rubber materials 4A and 4C have the same width as the tread ring 102, and the second rubber material 4B has the same width as the second rubber layer 8B.

  Next, the drum holder 3 is configured to be movable in the direction of the axis 2j of the forming drum 2 in this example. In the formation line L, the rubber material servicer 5 and the ply material servicers 7A and 7B are arranged along the trajectory T of the movement.

  As shown in FIG. 2, the drum holder 3 includes a lateral movement table 10 and a lifting table 11, and the molding drum 2 is rotatably held by the lifting table 11.

  The lateral movement table 10 is guided by the rail 12 that forms the track T and can move in the direction of the axis 2j. The lateral movement table 10 is controlled by appropriate driving means (not shown) including, for example, a servo motor. Thereby, the shaping | molding drum 2 can be moved and stopped to the sticking position in each servicer 5, 7A, 7B.

  The elevator 11 is guided by a vertical guide 13 provided on the lateral movement table 10 and supported so as to be movable up and down. The drum holder 3 includes a height adjusting unit 51 including, for example, a servo motor. As will be described later, the height adjusting means 51 is formed by the molding drum 2 during the winding according to the thickness increase amount of the wound body M (shown in FIG. 6B) that increases as the rubber material 4 is wound. The height position of the shaft center 2j is adjusted.

  In this example, the forming drum 2 is a cylindrical drum capable of expanding and contracting and having a known structure.

  As shown in FIG. 3, the rubber material servicer 5 includes an applicator 14 for attaching the rubber material 4. In this example, the servicer 5 includes an applicator 14A for attaching the first rubber material 4A (same as the third rubber material 4C) and an applicator 14B for attaching the second rubber material 4B. The case is shown. The applicators 14A and 14B are each fixed by being displaced in the drum circumferential direction by a support 50 such as a support column.

  The servicer 5 of this example further includes supply means 15A for supplying the first rubber material 4A to the applicator 14A, and supply means 15B for supplying the second rubber material 4B to the applicator 14B.

  The supply means 15A has substantially the same configuration as the supply means 15B, and the supply means 15A will be described below as a representative.

  The supply means 15 </ b> A includes a roll stand 17, a peeling tape recovery means 18, and a festoon portion 19. The roll stand 17 pivotally supports the roll body 16 of the rubber material 4 in a rotatable manner. The collecting means 18 peels the peeling tape t from the rubber material 4 drawn from the roll body 16 and collects it. The festoon portion 19 is interposed between the roll stand 17 and the applicator 14A, and stores the rubber material 4 after the peeling tape t is peeled off in a U shape.

  The festoon unit 19 is provided with a storage amount detection means 20. The detecting means 20 includes an arm 20A whose one end is pivotally supported so that it can swing up and down. The other end of the arm 20A is provided with a roller 20B that urges the rubber material 4 downward to suppress loosening. The storage amount is detected by the inclination angle of the arm 20A. Further, the supply means 15A adjusts the withdrawal of the rubber material 4 from the roll body 16 by, for example, turning on / off the collection means 18 in accordance with the inclination angle.

  The applicator 14A has substantially the same configuration as the applicator 14B, and the applicator 14A will be described below as a representative.

  As shown in FIGS. 4 and 5A, the applicator 14 </ b> A includes a transport unit 21, a pressing unit 22, and a cutting unit 23.

  The conveyance means 21 conveys the rubber material 4 from the supply means 15A in the length direction. In this example, the conveying means 21 includes a lower conveyor portion 21L and an upper conveyor portion 21U.

  The lower conveyor portion 21 </ b> L includes a conveyor belt 25 that is guided by a plurality of guide rollers 24 so as to be able to go around. Further, the upper conveyor portion 21U has a pressing belt 27 guided by a plurality of guide rollers 26 so as to be able to go around. The rubber material 4 is transported by being sandwiched between a transport surface that is the upper surface of the transport belt 25 and a pressing surface that is the lower surface of the pressing belt 27.

  The pressing means 22 presses the rubber material 4 sent out from the conveying means 21 against the molding drum 2 side. In this example, a pressing roller 28 is employed as the pressing means 22.

  As shown in FIG. 5B, the pressing roller 28 includes a support shaft 30 and a plurality of roller pieces 31 that are extrapolated to the support shaft 30.

  In this example, the support shaft 30 is supported by the arm 32 pivotally supported by the frame F of the transport means 21 so that the position between the first position Q1 and the second position Q2 can be changed up and down. The first position Q1 is a standby position, and at the start of application, the pressing roller 28 escapes upward and waits so that the tip of the rubber material 4 fed from the conveying means 21 does not interfere with the pressing roller 28. The second position Q2 is an attaching position, and the rubber material 4 is attached to the molding drum 2 side at this position.

  Then, the height of the axis 2j of the forming drum 2 during winding is determined according to the thickness increase amount of the winding body M so that the outer surface of the winding body M is in contact with the pressing roller 28 at the second position Q2. The position is adjusted sequentially.

  A rod of a cylinder 33 supported by the frame F is attached to the arm 32, and the pressing roller 28 can tilt integrally with the arm 32 by expansion and contraction of the cylinder 33.

  As shown in FIG. 5A, the cutting means 23 includes a cutter 40 on the downstream side of the conveying means 21, and cuts the rubber material 4 between the conveying means 21 and the pressing roller 28 (pressing means 22). .

  The cutting means 23 of this example includes a cutter holder 41 that can tilt up and down around an axis 44j, and a guillotine-like cutter 40 that attaches to the cutter holder 41.

  The cutter holder 41 includes a base 42 that is pivotally supported by the frame F, and a cutter support 43 that has one end attached to the base 42. The base body 42 of this example includes a support shaft portion 44 that forms the shaft center 44j, and this support shaft portion 44 is connected to a drive unit 45 such as a motor. The cutter support portion 43 has, for example, a plate shape extending from the one end portion to the downstream side in the transport direction, and the cutter 40 is attached to the lower surface and the other end portion thereof.

  The cutter 40 has a guillotine shape having a blade portion at the lower end. The rubber material 4 can be cut in the width direction by tilting the cutter holder 41 downward from the standby state Y1.

In this example, the cutting means 23 includes a heater 46 that heats the cutter 40.
The heater 46 can contact the cutter holder 41 (in this example, the cutter support portion 43) in the standby state Y1. Thereby, the heater 46 of this example can heat the cutter 40 via the cutter holder 41 (the cutter support part 43 in this example). The heater 46 is supported by the frame F.

  Here, in the servicer 5, the thin unvulcanized rubber material 4 is stuck as described above. Such a rubber material 4 is soft and unstable. For this reason, even with a slight vibration at the time of pasting, the rubbers adhere to each other and become easily wrinkled or rounded into a lump and easily deformed, resulting in poor pasting. In particular, when the applicator 14 is moved up and down, vibration is applied to the rubber material 4 and the above-mentioned sticking failure is more likely to occur.

  Therefore, in the present invention, the applicator 14 is fixed to a support 50 such as a support so as not to move up and down, and the height adjusting means 51 (shown in FIG. 2) is arranged on the drum holder 3. . As shown in FIGS. 6 (A) and 6 (B), the height adjusting means 51 is formed with a molding drum during winding according to the thickness increase amount ΔT of the wound body M that is increased by winding the rubber material 4. The height position of the second axis 2j is adjusted.

  Thereby, the rubber material 4 can be affixed to the molding drum 2 side at a constant affixing position P without giving vibration to the rubber material 4 and without being influenced by the thickness increase amount ΔT. As a result, it is possible to improve the pasting accuracy while suppressing deformation of the rubber material 4 such as rubber sticking due to vibration and wrinkling or curling into a lump.

  The height adjusting means 51 moves the forming drum 2 up and down based on a detection unit (not shown) that detects the thickness increase amount ΔT of the wound body M and detection data of the thickness increase amount ΔT by the detection unit. And a drive unit 60.

  A sensor capable of directly or indirectly measuring the thickness increase amount ΔT can be suitably used as the detection unit. As a method for directly measuring the thickness increase amount ΔT, for example, a distance sensor that measures a radial distance from the outer surface of the forming drum 2 to the outer surface of the winding body M, and the winding body M from a specific position of the servicer 5. A distance sensor that measures the radial distance to the outer surface can be used. A sensor or the like that measures the contact pressure between the pressing roller 28 and the wound body M at the second position Q2 can be used as an indirect measure of the thickness increase ΔT. In addition to this, the thickness increase amount ΔT can also be obtained from the thickness of the rubber material 4 obtained in advance and the data of the number of windings of the rubber material 4 by the molding drum 2.

  As shown in FIG. 2, a ball screw mechanism can be suitably employed as the drive unit 60. Specifically, the drive unit 60 of this example includes a screw shaft 51a that is parallel to the vertical guide 13 and supported by the lateral movement table 10, and a screw hole 51b that is provided on the lifting platform 11 and is screwed to the screw shaft 51a. In addition, a drive unit 51c such as a servo motor that can rotationally drive the screw shaft 51a and a control device (not shown) that controls the drive unit 51c based on detection data of the thickness increase amount ΔT by the detection unit.

  7A and 7B show a ply material servicer 7A. The servicer 7A of this example includes an actuator 55 including a belt conveyor portion 55A and a pressure roller 55B. The belt conveyor section 55 </ b> A conveys the cord strip 108 drawn from a roll body (not shown) in the length direction and sends it out to the forming drum 2. The pressure roller 55B is supported so as to be able to move up and down, and presses the pasted code strip 108 against the forming drum 2 when it is lowered. The actuator 55 moves in the direction of the axis 2j in synchronization with the rotation of the forming drum 2.

  8A and 8B show a ply material servicer 7B. The servicer 7B of this example includes, for example, a lower first conveyor 56 to which the belt cord ply 106B1 is attached, and an upper second conveyor 57 to which the belt cord ply 106B2 is attached.

  The first conveyor 56 is a belt conveyor, and conveys the belt cord ply 106B1 in the length direction on the upper surface thereof. The forming drum 2 is lowered and pressed against the belt cord ply 106B1 on the conveyor, whereby the belt cord ply 106B1 is attached.

  The second conveyor 57 includes first and second conveyor portions 57a and 57b arranged so as to be able to be connected. The first conveyor portion 57a conveys the belt cord ply 106B2 in the length direction on its upper surface. The second conveyor portion 57b sucks and receives the belt cord ply 106B2 from the first conveyor portion 57a by its lower surface and transports it in the length direction. The forming drum 2 moves up and is brought into pressure contact with the belt cord ply 106B2 adsorbed by the second conveyor portion 57b, whereby the belt cord ply 106B2 is attached.

  Note that reference numeral 61 in FIG. 1 denotes a grooving machine, and performs step S <b> 6 for forming a circumferential groove on the outer surface of the tread ring 102. At the carry-out position K, the tread ring 102 is carried out to the vulcanization process.

  The forming apparatus 1 of the present invention can be configured as an apparatus that forms the rubber member 105 for a tire by winding a rubber material 4 having a long band shape and a narrow width, for example, while being spirally wound. In this case, the servicer 5 is configured to be movable in the axial direction, but by providing the drum holder 3 with the height adjusting means 51, the entire apparatus can be controlled more easily.

  As mentioned above, although especially preferable embodiment of this invention was explained in full detail, this invention is not limited to embodiment of illustration, It can deform | transform and implement in a various aspect.

DESCRIPTION OF SYMBOLS 1 Tire rubber member forming apparatus 2 Molding drum 3 Drum holder 4 Rubber material 5 Servicer 51 Height adjusting means 60 Drive unit 105 Tire rubber member M Rolled body ΔT Thickness increase amount

Claims (3)

A tire rubber member forming apparatus for forming a tire rubber member by winding a long belt-shaped rubber material on a cylindrical molding drum,
A drum holder for rotatably holding the molding drum;
A servicer for supplying and pasting the rubber material to the molding drum;
The drum holding machine includes a height adjusting means for adjusting a height position of an axis of the forming drum during winding according to a thickness increase amount of the winding body that is increased by winding the rubber material. Rubber member forming device.   2. The tire rubber member forming apparatus according to claim 1, wherein the height adjusting means includes a detection unit that detects the thickness increase amount. 3.   The tire rubber member forming apparatus according to claim 2, wherein the height adjusting unit includes a drive unit that moves the molding drum up and down based on detection data of the thickness increase amount by the detection unit.

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