JP6297394B2 - Method and apparatus for manufacturing bead member - Google Patents

Description

  The present invention relates to a bead member manufacturing method and a manufacturing apparatus for manufacturing a bead member by winding a bead filler having a predetermined cross-sectional shape around an outer periphery of an annular bead wire.

  In manufacturing a pneumatic tire, a method of manufacturing a bead member by winding a bead filler having a predetermined length around an outer circumference of an annular bead wire to join the ends to form an annular shape is known. However, in general, a method in which a bead filler having a predetermined cross-sectional shape is extruded linearly and wound around the outer periphery of the bead wire is often used, and tension is generated due to the difference between the inner and outer peripheries of the bead filler. For this reason, there are problems that the outer peripheral portion is bent or thinned, the joint portion is peeled off, or extra cutting rubber is generated.

  In Patent Document 1, a bead filler is formed on the outer peripheral side of a bead wire by laminating a ribbon-shaped rubber material while being wound on a support disk. In Patent Document 1, a rubber member extruded in a straight line is wound around the outer peripheral side of the bead wire. However, since the rubber member has a thin ribbon shape, the tension due to the inner and outer peripheral differences is relatively small. However, since the ribbon-like rubber member is pressed against the support disk and molded into the shape of a bead filler, the bead filler is pressed against the support disk, and it becomes difficult to remove the mold after molding.

  In the following Patent Document 2, a bead wire is disposed on a rotatable plate, and while the plate is rotated, a string-like or belt-like rubber-like elastic material having a reduced viscosity is supplied to the outer peripheral surface of the bead wire, While pressing the rubber-like elastic material against the bead wire with a die, the plate is rotated one or more times to form a bead filler having a predetermined shape. In this method, since the bead filler is pressed against the plate and pressed, it is difficult to remove the mold after molding. Further, the tension due to the difference between the inner and outer circumferences of the bead filler is not completely eliminated.

JP 2007-76233 A JP 2002-187218 A

  Then, the objective of this invention is providing the manufacturing method and manufacturing apparatus of a bead member which can suppress the tension | tensile_strength by the inner-periphery difference of a bead filler, and are easy to demold after a bead filler shaping | molding.

The above object can be achieved by the present invention as described below.
That is, the method for manufacturing a bead member according to the present invention includes:
A bead member manufacturing method for manufacturing a bead member by winding a bead filler having a predetermined cross-sectional shape around the outer periphery of an annular bead wire,
A step of adsorbing and holding the tip of the bead filler supplied in a curved state from a supply device by a suction pad;
The step of bringing the tip of the held bead filler close to the outer periphery of the bead wire held on the rotary table;
Supplying the bead filler while rotating the bead wire in a circumferential direction, and wrapping the bead filler around the bead wire;
And a step of joining a rear end portion of the bead filler to the front end portion.

  The method for manufacturing a bead member according to the present invention winds the bead filler supplied in a curved state from the supply device around the outer periphery of the rotating bead wire, thereby winding the bead filler around the outer periphery of the bead wire while maintaining the curvature of the bead filler. Therefore, the tension due to the difference between the inner and outer circumferences of the bead filler can be suppressed. Further, when the bead filler is wound around the bead wire, the tip of the bead filler supplied from the supply device is adsorbed and held by the suction pad, and the bead filler is held close to the outer periphery of the bead wire. The tip of the filler can be accurately positioned with respect to the bead wire. Further, in the present invention, since the bead filler having a predetermined cross-sectional shape is directly wound around the bead wire, it is not necessary to press the bead filler strongly against the rotary table and molding, and demolding after the bead filler molding is easy. is there. As a result, according to the method for manufacturing a bead member of the present invention, the tension due to the difference between the inner and outer circumferences of the bead filler can be suppressed, and demolding after the bead filler molding becomes easy.

  In the step of winding the bead filler, it is preferable that the tip of the bead filler is held by the suction pad.

  According to this configuration, when the bead filler is wound around the bead wire, the position of the bead filler with respect to the bead wire is not shifted.

  In the step of winding the bead filler, the bead filler is preferably pressed toward the outer periphery of the bead wire.

  According to this configuration, since the bead filler is not pressed against the rotary table and pressed, it is easy to remove the mold after forming the bead filler.

Further, the bead member manufacturing apparatus according to the present invention includes:
A bead member manufacturing apparatus for manufacturing a bead member by winding a bead filler having a predetermined cross-sectional shape around the outer periphery of an annular bead wire,
A supply device for supplying the bead filler in a curved state;
A rotary table that holds the bead wire and rotates it in the circumferential direction;
An annular mounting surface provided on the rotary table and capable of mounting the bead filler;
A suction pad that protrudes outward from the placement surface and can absorb the bead filler;
Control for controlling the suction pad so that the tip of the bead filler supplied from the supply device is sucked and held by the suction pad and the tip of the held bead filler is brought close to the outer periphery of the bead wire. And a device.

  The bead member manufacturing apparatus according to the present invention wraps the bead filler supplied in a curved state from the supply device around the outer periphery of the bead wire that rotates together with the rotary table, thereby maintaining the curvature of the bead filler. Since it can wind around an outer periphery, the tension | tensile_strength by the inner and outer periphery difference of a bead filler can be suppressed. Further, when the bead filler is wound around the bead wire, the tip of the bead filler supplied from the supply device is adsorbed and held by the suction pad, and the bead filler is held close to the outer periphery of the bead wire. The tip of the filler can be accurately positioned with respect to the bead wire. Further, in the present invention, since the bead filler having a predetermined cross-sectional shape is directly wound around the bead wire, it is not necessary to press the bead filler strongly against the rotary table and molding, and demolding after the bead filler molding is easy. is there. As a result, according to the bead member manufacturing apparatus of the present invention, the tension due to the difference between the inner and outer circumferences of the bead filler can be suppressed, and demolding after the bead filler molding is facilitated.

  In the bead member manufacturing apparatus according to the present invention, it is preferable to include a guide roller that is provided above the placement surface and guides the bead filler to the placement surface.

  According to this configuration, the bead filler can be accurately wound around the outer periphery of the bead wire placed on the placement surface.

  In the bead member manufacturing apparatus according to the present invention, it is preferable that the suction pad can be accommodated in the rotary table while holding a tip end portion of the bead filler.

  According to this configuration, the suction pad can be prevented from interfering with the guide roller.

The perspective view which shows the manufacturing apparatus of the bead member which concerns on this invention. Perspective view of bead member The perspective view which shows the manufacturing process of a bead member The perspective view which shows the manufacturing process of a bead member The perspective view which shows the manufacturing process of a bead member Schematic diagram showing the manufacturing process of the bead member Schematic diagram showing the manufacturing process of the bead member Schematic diagram showing the manufacturing process of the bead member Schematic diagram showing the manufacturing process of the bead member Schematic diagram showing the manufacturing process of the bead member Schematic diagram showing the manufacturing process of the bead member Schematic diagram showing the manufacturing process of the bead member Side view showing the pressure roller

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an entire configuration of a bead member manufacturing apparatus. The manufacturing apparatus 1 of the present invention is for manufacturing a bead member by winding a bead filler having a predetermined cross-sectional shape around an outer periphery of an annular bead wire.

  FIG. 2 is a perspective view showing the bead member 10 with a part thereof broken. The bead member 10 includes an annular bead wire 11 and an annular bead filler 12 made of rubber having a substantially triangular cross section. The annular bead filler 12 is formed by extruding rubber having the above-mentioned cross-sectional shape from an extruder, cutting it into a certain length, and joining the ends thereof. At this time, it is preferable to extrude the rubber in a curved state so as to have a desired curvature from the extruder, and to form the bead filler 12 as an annular shape while maintaining the curvature.

  The manufacturing apparatus 1 of the present invention includes at least a supply device 2 that supplies a bead filler, a rotary table 3, and a control device (not shown).

  The supply device 2 can supply the bead filler 12 to the turntable 3 in a curved state. In the present embodiment, as an example of the supply device 2, a roller conveyor including a plurality of conveying rollers that rotate while supporting the lower surface of the curved bead filler 12 is illustrated.

  The supply device 2 is arranged in a spiral manner around the support column 21 suspended from above and the support column 21 so as to form a spiral transfer surface, and is rotated and supported while supporting the lower surface of the bead filler 12. A plurality of conveying rollers 22. Here, the conveyance surface extends spirally from the upper side to the lower side so as to surround the periphery around the support column 21, and the bead filler 12 can be conveyed spirally from the upper side to the lower side. The plurality of transport rollers 22 are sequentially arranged at positions slightly shifted in the circumferential direction from the top to the bottom, and the arranged roller surfaces 22a constitute a spiral transport surface. In FIG. 1, only a part of the plurality of transport rollers 22 is shown.

  The turntable 3 of this embodiment has a disk shape. However, the rotary table 3 does not necessarily have a disk shape. The rotary table 3 can rotate at an arbitrary rotation speed around the rotation axis.

  The rotary table 3 is provided with a bead wire holding portion 31 and can hold the annular bead wire 11 from the inner peripheral side. By rotating the turntable 3, the held bead wire 11 can be rotated in the circumferential direction.

  An annular placement surface 32 on which the bead filler 12 can be placed is provided on the outer peripheral side of the bead wire holding portion 31. The bead filler 12 supplied in a curved state from the supply device 2 can be placed on the placement surface 32 while maintaining its curvature.

  The rotary table 3 is provided with a suction pad 33 so as to protrude outward from the mounting surface 32. The suction pad 33 can be displaced between a protruding position shown in FIG. 1 and a retracted position retracted from the protruding position. The suction pad 33 in the retracted position is located below the placement surface 32 and is stored in the rotary table 3.

  The tip of the suction pad 33 is a suction surface, and is configured to be able to switch between the suction state and the suction release state with respect to the bead filler 12 by suction / exhaust by suction / exhaust means such as a vacuum pump (not shown). .

Above the placement surface 32, guide rollers 34 for guiding the bead filler 12 to the mounting surface 32 is provided. The rotation axis of the guide roller 34 is inclined with respect to the placement surface 32.

  Further, the transport device 1 includes a control device (not shown), and this control device can control each operation such as rotation of the rotary table 3, suction and lifting / lowering of the suction pad 33. Detailed control by the control device will be described later.

  Below, the manufacturing method of the bead member concerning the present invention is explained. The method for manufacturing a bead member according to the present invention is for manufacturing a bead member by winding a bead filler having a predetermined cross-sectional shape around an outer periphery of an annular bead wire.

  The bead member manufacturing method includes at least a step of supplying the bead filler 12 from the supply device 2 while rotating the bead wire 11 in the circumferential direction, and winding the bead filler 12 around the outer periphery of the bead wire 11, and the wound bead filler 12. And joining the rear end portion to the front end portion.

  3A to 3C and FIGS. 4A to 4G show a process of manufacturing a bead member. 3A to 3C are perspective views of the entire manufacturing apparatus as viewed from an oblique direction, and FIG. 4 is a schematic view of a part of the manufacturing apparatus as viewed from the side.

  As shown in FIG. 1, the bead wire 11 is fixed to the turntable 3 by the bead wire holding unit 31 in advance. The turntable 3 is stopped so that the suction pad 33 is positioned further downstream than the most downstream transport roller 22 in the transport direction 2d of the supply device 2.

  First, as shown in FIG. 4A, the supply of the bead filler 12 is started in a curved state from the supply device 2 with the rotary table 3 stopped. At this time, the suction pad 33 is in the retracted position and is stored in the rotary table 3.

  And when the front-end | tip part 12a of the bead filler 12 arrives above the suction pad 33, as shown to FIG. 3A and FIG. 4B, the suction pad 33 protrudes outside from the mounting surface 32, and the front-end | tip part of the bead filler 12 The lower surface of 12a is adsorbed and held.

  Next, as shown in FIG. 4C, the rotation of the turntable 3 is started while the suction pad 33 is moved backward. At this time, the suction pad 33 remains sucking the tip 12 a of the bead filler 12. By retracting the suction pad 33 until it is stored in the turntable 3, as shown in FIGS. 3B and 4D, the tip end portion 12a of the held bead filler 12 is moved to the bead wire 11 held on the turntable 3. Close to the outer circumference.

  Thereafter, as shown in FIG. 3C, the bead filler 12 is supplied while rotating the bead wire 11 in the circumferential direction, and the bead filler 12 is gradually wound around the outer periphery of the bead wire 11. Then, as shown in FIGS. 4E and 4F, the bead filler 12 for one turn is wound around the outer periphery of the bead wire 11.

  When the bead filler 12 is wound around the outer periphery of the bead wire 11, the rotation of the rotary table 3 is stopped and the rear end portion 12b of the bead filler 12 is joined to the front end portion 12a using the joint stitcher 35 as shown in FIG. 4G. Let

  Moreover, the manufacturing apparatus 1 includes a pressure roller 36 as shown in FIG. The pressure roller 36 can apply a force directed radially inward to the bead filler 12, and thereby the bead filler 12 can be pressure-bonded to the bead wire 11. The crimping of the bead filler 12 may be performed simultaneously while the bead filler 12 is being wound, or may be performed after the bead filler 12 has been wound.

[Other Embodiments]
(1) Although the roller conveyor is shown as an example of the supply device 2 in the above-described embodiment, the present invention is not limited to this. For example, the curved bead filler 12 may be directly supplied to the turntable 3 using an extruder that can extrude the bead filler 12 in a curved state.

  (2) Two rotating tables 3 may be prepared for one supply device 2, and the bead filler 12 may be alternately supplied from the supply device 2. Thereby, the cycle time which manufactures the bead member 10 can be shortened.

DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Supply apparatus 3 Rotary table 10 Bead member 11 Bead wire 12 Bead filler 32 Mounting surface 33 Suction pad 34 Guide roller

Claims (6)

A bead member manufacturing method for manufacturing a bead member by winding a bead filler having a predetermined cross-sectional shape around the outer periphery of an annular bead wire,
A step of adsorbing and holding the tip of the bead filler that is extruded and supplied in a curved state from an extruder by an adsorption pad;
The step of bringing the tip of the held bead filler close to the outer periphery of the bead wire held on the rotary table;
Supplying the bead filler while rotating the bead wire in a circumferential direction, and wrapping the bead filler around the bead wire;
Joining the rear end portion of the bead filler to the front end portion, and a method of manufacturing a bead member.   The method for manufacturing a bead member according to claim 1, wherein in the step of winding the bead filler, a tip portion of the bead filler is in a state of being held by the suction pad.   The method for manufacturing a bead member according to claim 1 or 2, wherein, in the step of winding the bead filler, the bead filler is pressed toward an outer periphery of the bead wire. A bead member manufacturing apparatus for manufacturing a bead member by winding a bead filler having a predetermined cross-sectional shape around the outer periphery of an annular bead wire,
An extruder for extruding and supplying the bead filler in a curved state ;
A rotary table that holds the bead wire and rotates it in the circumferential direction;
An annular mounting surface provided on the rotary table and capable of mounting the bead filler;
A suction pad that protrudes outward from the placement surface and can absorb the bead filler;
Control for controlling the suction pad so that the tip of the bead filler supplied from the extruder is sucked and held by the suction pad and the tip of the held bead filler is brought close to the outer periphery of the bead wire. An apparatus for manufacturing a bead member.   The bead member manufacturing apparatus according to claim 4, further comprising a guide roller that is provided above the placement surface and guides the bead filler to the placement surface.   The bead member manufacturing apparatus according to claim 5, wherein the suction pad can be stored in the rotary table while holding a tip portion of the bead filler.

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