JP2018039119A - Bead core coating method and bead core coating apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bead core coating method and a bead core coating apparatus which can arrange a reinforcement rubber around a bead core while suppressing costs and work man-hour and can coat the bead core with a belt-like rubber sheet highly accurately.SOLUTION: A bead core coating method includes: a step in which to wind a rubber sheet S pushed out by a first extruder 1 around a rotary drum 3; a step in which to paste a part of an end part in a width direction of the rubber sheet S on an outer surface of the rotary drum 3 to an inner peripheral surface side of the bead core 8 and to wind the rubber sheet S around the inner peripheral surface side of the bead core 8; a step in which to wind a reinforcement rubber T extruded by a second extruder 2 around the rotary drum 3; a step in which to paste a part of an end part in a width direction of the reinforcement rubber T on an outer surface of the rotary drum 3 onto the inner peripheral surface side of the rotating bead core 8 and to wind the reinforcement rubber T around the inner peripheral surface of the bead core 8; and a step in which to wind the remaining part in the width direction of the rubber sheet S and the reinforcement rubber T along the bead core 8 cross-sectional shape.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bead core coating method and a bead core coating apparatus for coating an annular bead core with a belt-shaped rubber sheet.

  Generally, a bead portion of a pneumatic tire is provided with an annular bead core formed by rubber covering a converging body such as a steel wire. The surface of this bead core may be covered with a thin rubber sheet in order to integrate a steel wire or the like. This rubber sheet is sometimes called cover rubber or bead cover rubber.

  Patent Document 1 below describes a bead core coating apparatus and a bead core coating method for coating the surface of a bead core with a sheet member made of rubber. The bead core coating apparatus of Patent Document 1 is a supply unit that supplies a belt-shaped sheet member that covers the surface of a bead core to a rotating bead core, and a sheet that is rotated along the rotation direction of the bead core and is supplied from the supply unit. A mold roller that surrounds the member from the width direction and molds the sheet member along the cross-sectional shape of the bead core, and a part of the sheet member is attached to the bead core; and provided downstream of the mold roller in the rotational direction of the bead core, A pressure roller that contacts the sheet member attached to the surface and rotates from the contacted position toward the end of the sheet member.

  A bobbin wound in such a manner that sheet members formed in a long thin strip shape with a predetermined width in advance are stacked in the supply unit that supplies the sheet member. In this way, the method of supplying the sheet member stocked on the bobbin to the bead core requires a step of winding the sheet member around the bobbin in advance. Moreover, it is necessary to arrange | position a film between sheet members so that the sheet members laminated | stacked on the bobbin may not mutually adhere, and cost increases. Further, when the sheet member is attached to the bead core, a process of peeling the film is required, and the number of work steps is increased. Further, when the film is peeled off, a tension is applied to the sheet member to cause a dimensional change.

  Patent Document 2 below describes a method and an apparatus for winding a cover rubber around a bead core. The device of Patent Document 2 includes a let-off device that supplies cover rubber, a festooner into which the cover rubber that has come out of the let-off device is fed, and a bead covering device that covers the bead core with the cover rubber. The festooner absorbs the difference in speed of the cover rubber between the let-off device and the bead covering device. However, when such a festooner is used, a dimensional change occurs due to the tension applied to the cover rubber, and the accuracy deteriorates. .

  By the way, if the rubber thickness between the bead core and the carcass ply wound around the bead core is insufficient, the bead core and the carcass ply directly rub against each other when a load is applied, and the bead core shape is broken and the bead core is broken. Deformed, the strength of the bead portion decreased, and the carcass ply was damaged. Moreover, even if the bead core is covered with the cover rubber, since the cover rubber is thin, it is difficult to obtain a sufficient space between the bead core and the carcass ply, and the bead core steel wire or the like is prevented from being broken. It was difficult. Therefore, in Patent Document 3 below, a bead core wrapped with a thin cover rubber is fitted into a bead core-covered rubber member having a groove formed in the longitudinal direction, and the bead core-covered rubber member is protected over the entire circumference of the bead core. . However, in the form of Patent Document 3, in addition to the process of winding the cover rubber around the bead core, a process of extruding the bead core-covered rubber member and a process of fitting the bead core into the bead core-covered rubber member are necessary, and costs and work man-hours are reduced. Increase.

JP 2012-240334 A JP-A-49-15778 JP 2013-154486 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a bead core coating method and a bead core coating apparatus capable of disposing a reinforcing rubber around the bead core and covering the bead core with a belt-shaped rubber sheet with high accuracy while suppressing costs and work man-hours. Is to provide.

The above object can be achieved by the present invention as described below.
That is, the bead core coating method of the present invention is a bead core coating method for coating an annular bead core with a belt-shaped rubber sheet,
Pasting the tip of the belt-shaped rubber sheet extruded by the first extruder to the outer surface of the rotating drum, and winding the rubber sheet around the rotating drum;
Before the rubber sheet is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the rubber sheet in the width direction on the outer surface of the rotating drum. Pasting and winding the rubber sheet around the inner peripheral surface of the bead core;
A step of affixing a distal end portion of a belt-like reinforcing rubber extruded by a second extruder to the outer surface of the rotating drum, and winding the reinforcing rubber around the rotating drum;
Before the reinforcing rubber is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Pasting and winding the reinforcing rubber around the inner peripheral surface of the bead core;
Winding the rubber sheet wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the reinforcing rubber along the cross-sectional shape of the bead core.

  According to the bead core coating method according to this configuration, the belt-shaped rubber sheet extruded by the first extruder is wound around the rotating drum from the tip, and then the rubber sheet wound around the rotating drum is wound from the tip to the inner periphery of the bead core. Wrap around the surface. Further, the belt-shaped reinforcing rubber extruded by the second extruder is wound around the rotating drum from the tip, and then the reinforcing rubber wound around the rotating drum is wound around the inner peripheral surface side of the bead core from the tip. That is, the rubber sheet extruded from the first extruder and the reinforcing rubber extruded from the second extruder are directly attached to the inner peripheral surface side of the bead core through the rotating drum. According to this structure, the stock by a bobbin used by the method of patent document 1 is unnecessary, and can suppress cost and an operation man-hour. Moreover, the process of extruding the reinforcing rubber in advance and the process of fitting the bead core into the reinforcing rubber as in Patent Document 3 are unnecessary, and the cost and the number of work steps can be suppressed. The step of sticking the tip of the belt-like reinforcing rubber extruded by the second extruder to the outer surface of the rotating drum and winding the reinforcing rubber around the rotating drum is performed by attaching the tip of the reinforcing rubber to the outer surface of the rotating drum. It may be pasted directly or indirectly through a rubber sheet previously pasted.

  In addition, in the conventional method, the tension of the bobbin is wound, the tension when the film is peeled off, the tension when the film is transported by the festooner, and the dimensional change due to the shrinkage in the transport line, the accuracy of the cover rubber is deteriorated. According to the above, since the rubber sheet extruded from the first extruder is once wound around the outer surface of the rotating drum and then attached to the inner peripheral surface side of the bead core, the dimensional change is prevented, and the bead core is highly accurate with the rubber sheet. Can be coated. Furthermore, since the rubber sheet is wound around the bead core immediately after being extruded from the first extruder, adhesion failure to the bead core can be improved without being affected by a decrease in tack due to change over time.

In the bead core coating method according to the present invention, the step of wrapping the reinforcing rubber around the rotating drum includes the step of winding the reinforcing rubber extruded from the second extruder on the outer surface of the rotating drum. Is attached to the tip of the wrapping, and the reinforcing rubber is wound around the rotating drum,
The step of winding the rubber sheet around the inner peripheral surface side of the bead core and the step of winding the reinforcing rubber around the inner peripheral surface side of the bead core include winding the rubber sheet and the reinforcing rubber over the entire circumference of the rotating drum. Before being applied, the front end part of the width direction of the reinforcing rubber on the outer surface of the rotating drum is attached to the inner peripheral surface side of the rotating bead core, and the rubber sheet and the reinforcing rubber are integrated as a unit. It is preferable that it is the process of winding around the inner peripheral surface side of a bead core.

  According to this configuration, the belt-shaped rubber sheet extruded by the first extruder and the belt-shaped reinforcing rubber extruded by the second extruder are wound around the rotating drum from the tip, and then the rubber sheet wound on the rotating drum The reinforcing rubber is integrally wound around the inner peripheral surface of the bead core from the tip, and finally the remaining portion of the rubber sheet and the reinforcing rubber in the width direction is wound up along the cross-sectional shape of the bead core. Thereby, compared with the case where the rubber sheet and the reinforcing rubber are separately wound around the inner peripheral surface side of the bead core, the cycle time can be shortened, so that the cost and the number of work steps can be suppressed.

  In the bead core coating method according to the present invention, it is preferable that the reinforcing rubber is wound so as to be positioned at the center in the width direction of the rubber sheet on the outer surface of the rotating drum. Thereby, the both ends of the width direction of the rubber sheet wound around the inner peripheral surface side of the bead core and the reinforcing rubber can be wound in a balanced manner along the cross-sectional shape of the bead core.

Further, the bead core coating method of the present invention is a bead core coating method for coating an annular bead core with a belt-shaped rubber sheet,
A step of attaching the tip of a belt-like reinforcing rubber extruded by the first extruder to the outer surface of the rotating drum, and winding the reinforcing rubber around the rotating drum;
Before the reinforcing rubber is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Pasting and winding the reinforcing rubber around the inner peripheral surface of the bead core;
A step of affixing the tip of the belt-like rubber sheet extruded by the second extruder to the outer surface of the rotating drum, and winding the rubber sheet around the rotating drum;
Before the rubber sheet is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the rubber sheet in the width direction on the outer surface of the rotating drum. Pasting and winding the rubber sheet around the inner peripheral surface of the bead core;
Winding the reinforcing rubber wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the rubber sheet along the cross-sectional shape of the bead core.

  According to the bead core coating method according to this configuration, the belt-shaped reinforcing rubber extruded by the first extruder is wound around the rotating drum from the tip, and then the reinforcing rubber wound around the rotating drum is wound from the tip to the inner periphery of the bead core. Wrap around the surface. Further, the belt-shaped rubber sheet extruded by the second extruder is wound around the rotating drum from the tip, and then the rubber sheet wound around the rotating drum is wound from the tip to the inner peripheral surface side of the bead core. That is, the reinforcing rubber extruded from the first extruder and the rubber sheet extruded from the second extruder are directly attached to the inner peripheral surface side of the bead core through the rotating drum. According to this structure, the stock by a bobbin used by the method of patent document 1 is unnecessary, and can suppress cost and an operation man-hour. Moreover, the process of extruding the reinforcing rubber in advance and the process of fitting the bead core into the reinforcing rubber as in Patent Document 3 are unnecessary, and the cost and the number of work steps can be suppressed. Note that the step of attaching the tip of the belt-shaped rubber sheet extruded by the second extruder to the outer surface of the rotating drum and winding the rubber sheet around the rotating drum is performed by attaching the tip of the rubber sheet to the outer surface of the rotating drum. It may be attached directly or indirectly via a reinforcing rubber previously attached.

  In addition, in the conventional method, the tension of the bobbin is wound, the tension when the film is peeled off, the tension when the film is transported by the festooner, and the dimensional change due to the shrinkage in the transport line, the accuracy of the cover rubber is deteriorated. According to the above, since the rubber sheet extruded from the second extruder is once wound around the outer surface of the rotating drum and then attached to the inner peripheral surface of the bead core, the dimensional change is prevented and the bead core is made of rubber sheet with high accuracy. Can be coated. Furthermore, since the rubber sheet is wound around the bead core immediately after being extruded from the second extruder, the adhesion failure to the bead core can be improved without being affected by a decrease in tack due to a change with time.

In the bead core coating method according to the present invention, the step of winding the rubber sheet around the rotating drum includes the reinforcing rubber in which a front end portion of the belt-shaped rubber sheet extruded by a second extruder is on the outer surface of the rotating drum. Pasting the tip of the rubber sheet, and winding the rubber sheet around the rotating drum,
The step of winding the reinforcing rubber around the inner peripheral surface side of the bead core and the step of winding the rubber sheet around the inner peripheral surface side of the bead core include winding the reinforcing rubber and the rubber sheet over the entire circumference of the rotating drum. Before being applied, a part of the front end of the rubber sheet in the width direction on the outer surface of the rotating drum is attached to the inner peripheral surface side of the rotating bead core, and the reinforcing rubber and the rubber sheet are integrated as a unit. It is preferable that it is the process of winding around the inner peripheral surface side of a bead core.

  According to this configuration, the belt-shaped reinforcing rubber extruded by the first extruder and the belt-shaped rubber sheet extruded by the second extruder are wound around the rotating drum from the tip, and then the reinforcing rubber wound on the rotating drum. The rubber sheet is integrally wound around the inner peripheral surface side of the bead core from the tip, and finally the remaining portion of the reinforcing rubber and the rubber sheet in the width direction is wound up along the cross-sectional shape of the bead core. Thereby, compared with the case where the reinforcing rubber and the rubber sheet are separately wound around the inner peripheral surface side of the bead core, the cycle time can be shortened, so that the cost and the number of work steps can be suppressed.

  In the bead core coating method according to the present invention, it is preferable that the rubber sheet is wound so that the reinforcing rubber on the outer surface of the rotating drum is positioned at a central portion in the width direction of the rubber sheet. Thereby, both ends in the width direction of the reinforcing rubber and the rubber sheet wound around the inner peripheral surface side of the bead core can be wound up in a balanced manner along the cross-sectional shape of the bead core.

  In the bead core coating method according to the present invention, in the step of winding the reinforcing rubber around the rotating drum, the reinforcing rubber is wound in a circumferential groove formed along the circumferential direction on the outer surface of the rotating drum, The cross-sectional shape of the circumferential groove is preferably the same as the cross-sectional shape of the reinforcing rubber. According to this structure, the shape of the reinforcement rubber after winding up along the cross-sectional shape of a bead core becomes favorable.

Further, the bead core coating apparatus of the present invention is a bead core coating apparatus for coating an annular bead core with a belt-shaped rubber sheet,
A first extruder for extruding the rubber sheet;
A second extruder for extruding the reinforcing rubber;
A rotating drum for winding the rubber sheet extruded from the first extruder and the reinforcing rubber extruded from the second extruder;
The bead core is supported such that the outer surface of the rotating drum and the inner peripheral surface of the bead core are close to each other at a position downstream of the second extruder in the rotation direction of the rotating drum, and the supported bead core is rotated. A covering device;
A controller that controls the first extruder, the second extruder, the rotating drum, and the covering device,
The control unit affixes the tip of the belt-shaped rubber sheet extruded from the first extruder to the outer surface of the rotating drum, winds the rubber sheet around the rotating drum,
Before the rubber sheet is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the rubber sheet in the width direction on the outer surface of the rotating drum. Pasting, winding the rubber sheet around the inner peripheral surface of the bead core,
Affixed to the outer surface of the rotating drum is a belt-shaped tip of the reinforcing rubber extruded from the second extruder, and the reinforcing rubber is wound around the rotating drum,
Before the reinforcing rubber is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Paste, wind the reinforcing rubber around the inner peripheral surface side of the bead core,
The rubber sheet wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the reinforcing rubber are wound up along the cross-sectional shape of the bead core.

  The function and effect of the bead core coating apparatus having such a configuration is as described above, and the reinforcing rubber is arranged around the bead core and the bead core is covered with a belt-shaped rubber sheet with high accuracy while suppressing cost and work man-hours. can do.

Further, the bead core coating apparatus of the present invention is a bead core coating apparatus for coating an annular bead core with a belt-shaped rubber sheet,
A first extruder for extruding the reinforcing rubber;
A second extruder for extruding the rubber sheet;
A rotating drum for winding the reinforcing rubber extruded from the first extruder and the rubber sheet extruded from the second extruder;
The bead core is supported such that the outer surface of the rotating drum and the inner peripheral surface of the bead core are close to each other at a position downstream of the second extruder in the rotation direction of the rotating drum, and the supported bead core is rotated. A covering device;
A controller that controls the first extruder, the second extruder, the rotating drum, and the covering device,
The control unit affixed to the outer surface of the rotary drum the band-shaped tip of the reinforcing rubber extruded from the first extruder, wound the reinforcing rubber around the rotary drum,
Before the reinforcing rubber is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Paste, wind the reinforcing rubber around the inner peripheral surface side of the bead core,
Affixing the tip of the belt-shaped rubber sheet extruded from the second extruder to the outer surface of the rotating drum, winding the rubber sheet around the rotating drum,
Before the rubber sheet is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the rubber sheet in the width direction on the outer surface of the rotating drum. Pasting, winding the rubber sheet around the inner peripheral surface of the bead core,
The reinforcing rubber wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the rubber sheet are wound up along the cross-sectional shape of the bead core.

  The function and effect of the bead core coating apparatus having such a configuration is as described above, and the reinforcing rubber is arranged around the bead core and the bead core is covered with a belt-shaped rubber sheet with high accuracy while suppressing cost and work man-hours. can do.

The schematic diagram which shows an example of a structure of the bead core coating | coated apparatus which concerns on 1st Embodiment. The schematic diagram which shows an example of a structure of a 1st extruder and a rotating drum. Sectional drawing of the bead core which concerns on 1st Embodiment. AA line sectional view of FIG. BB sectional view of FIG. CC sectional view of FIG. DD sectional view of FIG. EE sectional view of FIG. FF sectional view of FIG. GG sectional view of FIG. HH line sectional view of FIG. Sectional view taken along the line II of FIG. Sectional drawing of the bead core which concerns on 2nd Embodiment. Front view of a rotating drum according to a second embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The bead core coating method and the bead core coating apparatus of the present invention are for coating an annular bead core with a belt-shaped rubber sheet. The bead core of this embodiment is described as having a hexagonal cross section, but the cross sectional shape of the bead core that can be covered by the bead core coating method and the bead core coating apparatus of the present invention is not limited to a hexagon, and may be a square or a round shape. Good.

(First embodiment)
FIG. 1 is a schematic view showing an example of the configuration of the bead core coating apparatus 100. The bead core coating apparatus 100 includes a first extruder 1, a second extruder 2, a rotating drum 3, a covering device 4, a first extruder 1, a second extruder 2, and a rotating drum 3. And a control unit 5 for controlling the covering device 4.

  FIG. 2 is a schematic diagram showing an example of the configuration of the first extruder 1 and the rotating drum 3. The first extruder 1 includes a cylindrical barrel 1a, a hopper 1b connected to a supply port of the barrel 1a, a screw 1c for kneading rubber and feeding it to the front end side, and a screw motor for rotationally driving the screw 1c. 1d. The rotational speed of the screw motor 1d is controlled by the controller 5 as will be described later.

  A gear pump 10 is connected to the front end side in the extrusion direction of the first extruder 1, and the front end side of the gear pump 10 is connected to the base 11. The rubber material kneaded by the first extruder 1 is supplied to the gear pump 10, and the gear pump 10 supplies a fixed amount of rubber to the base 11. The rubber sheet S is extruded from the base 11 with a predetermined extrusion amount.

  The gear pump 10 has a pair of gears 10 a and has a function of sending rubber toward the outlet toward the base 11. The pair of gears 10 a is driven to rotate by a gear motor 10 b, and the number of rotations is controlled by the control unit 5. By controlling the number of rotations of the gear motor 10b and the number of rotations of the screw motor 1d by the control unit 5, the amount of rubber sheet S pushed out from the base 11 can be controlled. For convenience of illustration, the pair of gears 10a are arranged in the vertical direction in FIG. 2, but may actually be arranged in the plane direction (the direction in which the rotation axis of the gear 10a is up and down in FIG. 2).

  A first pressure sensor 12 is provided on the inlet side of the gear pump 10, that is, on the side close to the first extruder 1, and detects the pressure of rubber supplied from the first extruder 1. A second pressure sensor 13 is provided on the outlet side of the gear pump 10 to detect the pressure of the rubber sheet S pushed out from the base 11.

  The pressure on the inlet side of the gear pump 10 is determined by the amount of rubber fed by the gear 10 a of the gear pump 10 and the screw 1 c of the first extruder 1. By keeping the pressure on the inlet side constant, the gear pump 10 can supply a fixed amount of rubber to the base 11 and the amount of extrusion from the base 11 is also stabilized. However, if the pressure on the inlet side is unstable, the amount of extrusion from the base 11 varies, making it difficult to form a rubber sheet S having a desired size.

  As a method for controlling the pressure on the inlet side of the gear pump 10, it is known to perform PID control on the rotational speed of the gear 10 a of the gear pump 10 and the rotational speed of the screw 1 c of the first extruder 1. This PID control is generally used when rubber is extruded continuously in a fixed amount.

  The control unit 5 controls the rotation speed of the screw motor 1 d of the first extruder 1 based on the pressure on the inlet side of the gear pump 10 detected by the first pressure sensor 12. The control unit 5 controls the rotation speed of the gear motor 10b based on a predetermined control program (by a time coefficient).

  In addition, in this embodiment, the example using what is called an external gear pump with which the gear pump 10 was connected to the extrusion direction front end side of the 1st extruder 1 is shown. However, instead of this, an extruder with a built-in gear pump in which a gear pump is built in the extruder may be used. In the present invention, the extruder with a built-in gear pump can more easily control the amount of extrusion compared to an extruder connected with an external gear pump, and a gear motor is unnecessary, so the tip of the extruder is more compact and more preferable. .

  The first extruder 1, the gear pump 10, and the base 11 are integrally configured to be movable forward and backward in the extrusion direction by the front / rear drive device 14, and can move toward and away from the rotary drum 3. Such forward and backward movement is also controlled by the control unit 5.

  Since the 2nd extruder 2 is the same structure as the 1st extruder 1, detailed description is abbreviate | omitted. The second extruder 2 includes a cylindrical barrel 2a, a hopper 2b connected to the supply port of the barrel 2a, a screw 2c for kneading rubber and feeding it to the tip side, and a screw motor for rotating the screw 2c. 2d.

  A gear pump 20 is connected to the front end side of the second extruder 2 in the extrusion direction, and the front end side of the gear pump 20 is connected to the base 21. The rubber material kneaded by the second extruder 2 is supplied to the gear pump 20, and the gear pump 20 supplies a fixed amount of rubber to the base 21. The reinforcing rubber T is extruded from the base 21 with a predetermined extrusion amount.

  The second extruder 2, the gear pump 20, and the base 21 are configured so as to be movable forward and backward in the extrusion direction by the front / rear drive device 24, and can move toward and away from the rotary drum 3. Such forward and backward movement is also controlled by the control unit 5.

  The rotating drum 3 is configured to be rotatable in the R1 direction by a servo motor 30. The number of rotations of the servo motor 30 is controlled by the control unit 5. The outer surface of the rotating drum 3 is supplied with the rubber sheet S extruded through the base 11 and the reinforcing rubber T extruded through the base 21, and rotates with the rubber sheet S and the reinforcing rubber T attached. By rotating the drum 3 in the R1 direction, the rubber sheet S and the reinforcing rubber T can be wound along the circumferential direction. The outer surface of the rotating drum 3 is made of metal. The outer diameter of the rotating drum 3 of this embodiment is, for example, 200 to 400 mm.

  The second extruder 2 is arranged downstream of the first extruder 1 in the rotation direction R1 of the rotary drum 3. Thereby, the rubber sheet S and the reinforcing rubber T are removed from the front end portion by sticking the front end portion of the reinforcing rubber T extruded by the second extruder 2 to the front end portion of the rubber sheet S wound around the rotary drum 3. It can wind around the rotating drum 3 simultaneously.

  The rotating drum 3 preferably includes a cooling mechanism for cooling the outer surface. As the cooling mechanism, for example, a water cooling mechanism that circulates cooling water inside the rotary drum 3 is used. Further, the outer surface of the rotary drum 3 is subjected to a surface treatment or a material used so that the attached rubber sheet S or the reinforcing rubber T is easily peeled off.

  The covering device 4 supports the bead core 8 so that the outer surface of the rotary drum 3 and the inner peripheral surface of the bead core 8 are close to each other at a position downstream of the second extruder 2 in the rotation direction R1 of the rotary drum 3. The supported bead core 8 is rotated. In the present embodiment, the position where the tip of the base 21 of the second extruder 2 and the outer surface of the rotating drum 3 are closest to each other, and the position where the inner peripheral surface of the bead core 8 and the outer surface of the rotating drum 3 are closest to each other. Is shifted by 180 ° in the rotation direction R1 of the rotary drum 3, but is not limited thereto. In the present embodiment, the outer diameter of the rotating drum 3 is smaller than the inner diameter of the bead core 8, and the rotating drum 3 is disposed on the inner peripheral surface side of the bead core 8 supported by the covering device 4. .

  The covering device 4 is for winding the rubber sheet S and the reinforcing rubber T attached to the inner peripheral surface of the bead core 8 from the inner peripheral surface side to the outer peripheral surface side along the cross-sectional shape of the bead core 8. . The covering device 4 can rotate the supported bead core 8 in the R2 direction. The bead core 8 rotates following the rotation of the rotating drum 3.

  FIG. 3 shows a cross-sectional view of the bead core 8. The bead core 8 of the present embodiment has a hexagonal cross section. The inner peripheral surface of the bead core 8 is a lower surface 8a, the outer peripheral surface is an upper surface 8d, the side surfaces on the inner peripheral surface side are lower side surfaces 8b and 8f, and the outer peripheral surface side. These side surfaces are designated as upper side surfaces 8c and 8e.

  A reinforcement rubber T is provided on the inner peripheral surface side of the bead core 8. The reinforcing rubber T is provided so as to cover the lower surface 8a and the lower side surfaces 8b, 8f of the bead core 8. The bead core 8 and the reinforcing rubber T are covered with a rubber sheet S. The composition of the cover rubber S and the thickness adjusting rubber T may be the same or different. A bead filler 9 having a substantially triangular cross section is disposed on the outer peripheral surface side of the bead core 8. The inner diameter of the bead core 8 is, for example, 400 to 650 mm.

  The covering device 4 includes, in order from the upstream side to the downstream side in the rotation direction R2 of the bead core 8, a pressing roller 41, a first molding roller 42, a lower side pressing roller 43, a second molding roller 44, and a first upper side pressing. A roller 45, a first bending roller 46, a second upper side pressure roller 47, a second bending roller 48, and a finishing roller 49 are provided. Further, the covering device 4 is provided with a plurality of guide rollers 40 that prevent the rotating bead core 8 from meandering.

  4A is a cross-sectional view taken along line AA of FIG. A rubber sheet S is wound around the outer surface of the rotating drum 3. Further, a reinforcing rubber T is wound around the outer peripheral surface of the rubber sheet S. In the cross section of the rubber sheet S of the present embodiment, both ends in the width direction are thin, and when the rubber sheet S is wound around the surface of the bead core 8 and the both ends in the width direction are joined, the thinned portions are overlapped. This prevents the junction from becoming thick.

  The pressing roller 41 is disposed at a position facing the rotating drum 3 with a part of the bead core 8 interposed therebetween. The rotation axis of the pressing roller 41 is parallel to the rotation axes of the rotating drum 3 and the bead core 8, and the pressing roller 41 rotates while the outer peripheral surface of the pressing roller 41 is in contact with the upper surface 8 d of the bead core 8. The pressing roller 41 is configured to be movable inward and outward in the radial direction of the bead core 8. Thus, when a part of the reinforcing rubber T on the outer surface of the rotating drum 3 in the width direction is attached to the lower surface 8a (inner peripheral surface) of the rotating bead core 8, the pressing roller 41 presses the upper surface 8d of the bead core 8. can do. Note that the pressing roller 41 is a driven roller that is rotated by the rotation of the bead core 8.

  4B is a cross-sectional view taken along line BB in FIG. The first embossing roller 42 is disposed on the inner peripheral surface side of the bead core 8. The rotation axis of the first shaping roller 42 is parallel to the rotation axis of the bead core 8. As shown in FIG. 4B, the first embossing roller 42 has a pincushion shape with the center recessed relative to the left and right. The concave portion 421 of the first shaping roller 42 is disposed so as to contact the lower surface 8a of the bead core 8 and the left and right lower side surfaces 8b, 8f via the rubber sheet S and the reinforcing rubber T. Further, an auxiliary roller 42 a configured to be movable inward and outward in the radial direction of the bead core 8 is disposed at a position facing the first shaping roller 42 across the bead core 8. The rotation axis of the auxiliary roller 42 a is parallel to the rotation axes of the first shaping roller 42 and the bead core 8. Thereby, the rubber sheet S and the reinforcing rubber T can be folded upward along the left and right lower side surfaces 8 b and 8 f of the bead core 8 by the concave portion 421 of the first shaping roller 42. The first embossing roller 42 and the auxiliary roller 42 a are driven rollers that are driven to rotate by the rotation of the bead core 8.

  4C is a cross-sectional view taken along the line CC of FIG. The lower surface pressure roller 43 is disposed on the inner peripheral surface side of the bead core 8. The rotation axis of the lower surface pressure roller 43 is parallel to the rotation axis of the bead core 8. The lower side pressing rollers 43 are provided one by one so as to face the left and right sides of the bead core 8. The pair of lower surface pressing rollers 43 are configured to be movable to the left and right in the width direction of the bead core 8. The lower surface pressure roller 43 has a truncated cone shape, and is arranged so that the outer peripheral surface forming a tapered surface comes into contact with the lower surfaces 8b and 8f of the bead core 8 via the rubber sheet S and the reinforcing rubber T, respectively. . In addition, an auxiliary roller 43 a configured to be movable inward and outward in the radial direction of the bead core 8 is disposed at a position facing the lower pressing roller 43 with the bead core 8 interposed therebetween. The rotating shaft of the auxiliary roller 43 a is parallel to the rotating shafts of the lower press roller 43 and the bead core 8. Accordingly, the rubber sheet S and the reinforcing rubber T can be pressed against the lower side surfaces 8 b and 8 f of the bead core 8 by the lower side pressure roller 43. The lower side pressure roller 43 is a drive roller that is driven by a motor (not shown), and the auxiliary roller 43 a is a driven roller that is rotated by the rotation of the bead core 8.

  4D is a cross-sectional view taken along the line DD of FIG. The second shaping roller 44 is disposed on the inner peripheral surface side of the bead core 8. The rotation axis of the second shaping roller 44 is parallel to the rotation axis of the bead core 8. The second shaping roller 44 includes a body portion 441 that rotates along the lower surface 8 a of the bead core 8, and disk-shaped flange portions 442 that are respectively provided at both ends of the body portion 441. The distance between the left and right flange portions 442 is substantially the same as the width obtained by adding the thickness of the rubber sheet S to the width of the bead core 8. Further, the second shaping roller 44 is configured to be movable inward and outward in the radial direction of the bead core 8. Thereby, the width direction both ends of the rubber sheet S can be made to stand upwards by the flange part 442 of the 2nd shaping | molding roller 44. FIG. The second embossing roller 44 is a driven roller that rotates following the rotation of the bead core 8.

  4E is a cross-sectional view taken along line EE of FIG. The first upper side pressure roller 45 is disposed on the side of the bead core 8. The rotation axis of the first upper side pressure roller 45 is parallel to the radial direction of the bead core 8. The first upper side pressure roller 45 has a bobbin shape in which two truncated cone parts 451 and 452 are coupled. The outer peripheral surface of one truncated cone part 451 is disposed so as to contact the upper side surface 8 c of the bead core 8 with the rubber sheet S interposed therebetween. The first upper side pressure roller 45 is configured to be movable left and right in the width direction of the bead core 8. Further, an auxiliary roller 45 a configured to be movable to the left and right in the width direction of the bead core 8 is disposed at a position facing the first upper side pressure roller 45 with the bead core 8 interposed therebetween. The rotation axis of the auxiliary roller 45 a is parallel to the rotation axis of the first upper side pressure roller 45. Thereby, the rubber sheet S can be pressure-bonded to the upper side surface 8 c of the bead core 8 by the one truncated cone part 451 of the first upper side pressure-bonding roller 45. The first upper side pressure roller 45 is a drive roller that is driven by a motor (not shown), and the auxiliary roller 45 a is a driven roller that is rotated by the rotation of the bead core 8.

  4F is a cross-sectional view taken along line FF in FIG. The first bending roller 46 is disposed on the outer peripheral surface side of the bead core 8. The rotation axis of the first bending roller 46 is parallel to the rotation axis of the bead core 8. The first bending roller 46 includes a cylindrical portion 461 that rotates along the upper surface 8 d of the bead core 8 and a truncated cone portion 462 provided at one end of the cylindrical portion 461. The outer peripheral surface of the truncated cone part 462 is disposed so as to contact the upper side surface 8 c of the bead core 8 with the rubber sheet S interposed therebetween. An auxiliary roller 46 a configured to be movable inward and outward in the radial direction of the bead core 8 is disposed at a position facing the cylindrical portion 461 of the first bending roller 46 with the bead core 8 interposed therebetween. The rotation axis of the auxiliary roller 46 a is parallel to the rotation axes of the first bending roller 46 and the bead core 8. Thereby, one end of the rubber sheet S can be bent along the upper surface 8 d of the bead core 8 by the cylindrical portion 461 of the first bending roller 46. The first bending roller 46 is a driving roller that is driven by a motor (not shown), and the auxiliary roller 46 a is a driven roller that is rotated by the rotation of the bead core 8.

  4G is a cross-sectional view taken along line GG in FIG. The second upper side pressure roller 47 is disposed on the side of the bead core 8. The rotation axis of the second upper side pressure roller 47 is parallel to the radial direction of the bead core 8. The second upper side pressure roller 47 has a bobbin shape in which two truncated cone parts 471 and 472 are coupled. The outer peripheral surface of one truncated cone part 471 is disposed so as to contact the upper side surface 8e of the bead core 8 with the rubber sheet S interposed therebetween. The second upper side pressing roller 47 is configured to be movable to the left and right in the width direction of the bead core 8. Further, an auxiliary roller 47 a configured to be movable to the left and right in the width direction of the bead core 8 is disposed at a position facing the second upper side pressure roller 47 with the bead core 8 interposed therebetween. The rotation axis of the auxiliary roller 47 a is parallel to the rotation axis of the second upper side pressure roller 47. Thereby, the rubber sheet S can be pressure-bonded to the upper side surface 8 e of the bead core 8 by the one truncated cone part 471 of the second upper side pressure roller 47. The second upper side pressure roller 47 is a drive roller that is driven by a motor (not shown), and the auxiliary roller 47 a is a driven roller that is rotated by the rotation of the bead core 8.

  4H is a cross-sectional view taken along line HH in FIG. The second bending roller 48 is disposed on the outer peripheral surface side of the bead core 8. The rotation axis of the second bending roller 48 is parallel to the rotation axis of the bead core 8. The second bending roller 48 rotates along the upper surface 8 d of the bead core 8. An auxiliary roller 48 a configured to be movable inward and outward in the radial direction of the bead core 8 is disposed at a position facing the second bending roller 48 with the bead core 8 interposed therebetween. The rotation axis of the auxiliary roller 48 a is parallel to the rotation axes of the second bending roller 48 and the bead core 8. Thereby, the other end of the rubber sheet S can be bent along the upper surface 8 d of the bead core 8 by the second bending roller 48. The second bending roller 48 is a driving roller that is driven by a motor (not shown), and the auxiliary roller 48 a is a driven roller that is rotated by the rotation of the bead core 8.

  4I is a cross-sectional view taken along the line II of FIG. The finishing roller 49 is disposed on the outer peripheral surface side of the bead core 8. The rotation axis of the finishing roller 49 is parallel to the rotation axis of the bead core 8. The finishing roller 49 rotates along the upper surface 8 d of the bead core 8. The finishing roller 49 is configured to be movable inward and outward in the radial direction of the bead core 8. In addition, an auxiliary roller 49 a configured to be movable inward and outward in the radial direction of the bead core 8 is disposed at a position facing the finishing roller 49 with the bead core 8 interposed therebetween. The rotation axis of the auxiliary roller 49 a is parallel to the rotation axes of the finishing roller 49 and the bead core 8. Thereby, both ends of the rubber sheet S can be pressed against the upper surface 8 d of the bead core 8 by the finishing roller 49. The finishing roller 49 is a driving roller that is driven by a motor (not shown), and the auxiliary roller 49 a is a driven roller that is rotated by the rotation of the bead core 8. Further, the finishing roller 49 and the auxiliary roller 49a may be provided with a temperature adjusting mechanism for heating the roller itself in order to increase the pressure-bonding force. Examples of the temperature adjustment mechanism include a temperature adjustment mechanism using hot water, a heater, gas, or the like.

  Next, a bead core coating method using the bead core coating apparatus 100 will be described. The bead core coating method according to the first embodiment includes a step of sticking the tip of a belt-like rubber sheet S extruded by the first extruder 1 to the outer surface of the rotating drum 3 and winding the rubber sheet S around the rotating drum 3. A step of sticking the tip of the belt-shaped reinforcing rubber T extruded by the second extruder 2 to the tip of the rubber sheet S on the outer surface of the rotating drum 3 and winding the reinforcing rubber T around the rotating drum 3; Before the rubber sheet S and the reinforcing rubber T are wound around the entire circumference of the rotating drum 3, the inside of the bead core 8 that rotates the tip part of the width direction of the reinforcing rubber T on the outer surface of the rotating drum 3. A process of attaching the rubber sheet S and the reinforcing rubber T integrally to the inner peripheral surface of the bead core 8, and a remaining portion of the rubber sheet S and the reinforcing rubber T in the width direction wound around the inner peripheral surface of the bead core 8. And a step of winding along the cross-sectional shape of the bead core 8, the.

  First, the bead core 8 is set in the covering device 4. At this time, the first extruder 1 and the second extruder 2 are arranged outside the covering device 4.

  Next, the first extruder 1 is advanced in the direction of the rotating drum 3, and the base 11 is brought close to the outer surface of the rotating drum 3.

  Next, extrusion of the rubber sheet S is started from the die 11 of the first extruder 1 so that the front end portion of the rubber sheet S is attached to the outer surface of the rotating drum 3, and at the same time, rotation of the rotating drum 3 is started. Thereby, the extruded rubber sheet S can be wound around the rotary drum 3 from the front end portion.

  Next, the second extruder 2 is advanced in the direction of the rotating drum 3, and the base 21 is brought close to the outer surface of the rotating drum 3.

  Next, extrusion of the reinforcing rubber T is started from the base 21 of the second extruder 2, and the tip end portion of the reinforcing rubber T is attached to the tip end portion of the rubber sheet S on the outer surface of the rotating drum 3. Thereby, the extruded reinforcing rubber T can be wound around the rotary drum 3 from the tip portion. At this time, the reinforcing rubber T is wound so as to be positioned at the center in the width direction of the rubber sheet S on the outer surface of the rotating drum 3 (see FIG. 4A).

  Next, a part of the end portion in the width direction of the reinforcing rubber T on the outer surface of the rotating drum 3 is attached to the lower surface 8 a (inner peripheral surface) of the rotating bead core 8. Thereby, the rubber sheet S and the reinforcing rubber T can be integrally wound around the inner peripheral surface of the bead core 8.

  Next, the rubber sheet S and the reinforcing rubber T wound around the lower surface 8a of the bead core 8 are wound up by the covering device 4 along the cross-sectional shape of the bead core 8 with the remaining portions of the rubber sheet S and the reinforcing rubber T in the width direction ( (See FIGS. 4B-4I). Finally, the first extruder 1 and the second extruder 2 are moved backward to remove the bead core 8 covered with the rubber sheet S from the covering device 4.

(Second Embodiment)
The bead core coating method according to the second embodiment includes a step of sticking the tip of a belt-like reinforcing rubber T extruded by the first extruder 1 to the outer surface of the rotating drum 3 and winding the reinforcing rubber T around the rotating drum 3. A step of sticking the tip of the belt-like rubber sheet S extruded by the second extruder 2 to the tip of the reinforcing rubber T on the outer surface of the rotating drum 3 and winding the rubber sheet S around the rotating drum 3; Before the reinforcing rubber T and the rubber sheet S are wound around the entire circumference of the rotating drum 3, the inside of the bead core 8 that rotates the tip part of the width direction of the rubber sheet S on the outer surface of the rotating drum 3. A process of attaching the reinforcing rubber T and the rubber sheet S together on the peripheral surface, and winding the reinforcing rubber T and the rubber sheet S around the inner peripheral surface of the bead core 8 and the remaining portion of the reinforcing rubber T and the rubber sheet S in the width direction wound around the inner peripheral surface of the bead core 8 And a step of winding along the cross-sectional shape of the bead core 8, the.

  In the step of winding the rubber sheet S around the rotating drum 3, it is preferable that the rubber sheet S is wound so that the reinforcing rubber T on the outer surface of the rotating drum 3 is positioned at the center in the width direction of the rubber sheet S.

  FIG. 5 shows a cross-sectional view of the bead core 8 according to the second embodiment. The bead core 8 of the second embodiment has a hexagonal cross section, the inner peripheral surface of the bead core 8 is a lower surface 8a, the outer peripheral surface is an upper surface 8d, the side surfaces on the inner peripheral surface side are lower side surfaces 8b and 8f, and the outer peripheral surface. The side surfaces are referred to as upper side surfaces 8c and 8e. The bead core 8 is covered with a rubber sheet S. Reinforcing rubber T is provided on the inner peripheral surface side of the bead core 8 and outside the rubber sheet S.

  In addition, the bead core coating apparatus according to the second embodiment includes a first extruder 1 that extrudes the reinforcing rubber T, a second extruder 2 that extrudes the rubber sheet S, and the reinforcement extruded from the first extruder 1. A rotating drum 3 for winding the rubber T and the rubber sheet S extruded from the second extruder 2, and an outer surface of the rotating drum 3 and a bead core at a position downstream of the second extruder 2 in the rotation direction of the rotating drum 3. A covering device 4 that supports the bead core 8 so that the inner peripheral surfaces of the 8 are close to each other, and rotates the supported bead core 8, a first extruder 1, a second extruder 2, a rotating drum 3, and a covering. A control unit 5 for controlling the device 4, and the control unit 5 affixes the tip of the belt-shaped reinforcing rubber T extruded from the first extruder 1 to the outer surface of the rotary drum 3, and attaches the reinforcing rubber T to the outer surface of the rotating drum 3. Wound around the rotating drum 3, 2 is attached to the tip of the reinforcing rubber T on the outer surface of the rotating drum 3, and the rubber sheet S is wound around the rotating drum 3 to reinforce the reinforcing rubber. Before the T and rubber sheet S are wound over the entire circumference of the rotating drum 3, the inner peripheral surface of the bead core 8 that rotates the front end part of the width direction of the rubber sheet S on the outer surface of the rotating drum 3. The reinforcing rubber T and the rubber sheet S are integrally wound around the inner peripheral surface of the bead core 8, and the remainder of the reinforcing rubber T and the rubber sheet S wound around the inner peripheral surface of the bead core 8 in the width direction is the bead core 8. It winds up along the cross-sectional shape.

  FIG. 6 is a view of the rotary drum 3 as seen from a direction perpendicular to the rotation axis. A circumferential groove 31 extending along the circumferential direction is formed on the outer surface of the rotating drum 3. The cross-sectional shape of the circumferential groove 31 is the same as the cross-sectional shape of the reinforcing rubber T, and the reinforcing rubber T is wound by winding the reinforcing rubber T extruded from the first extruder 1 around the circumferential groove 31. And the rubber sheet S can be smoothed, and the occurrence of air entry or the like can be suppressed.

(Third embodiment)
In the first embodiment described above, the step of winding the rubber sheet S around the inner peripheral surface of the bead core 8 and the step of winding the reinforcing rubber T around the inner peripheral surface of the bead core 8 are performed at the same time. Also good. Specifically, the tip of the belt-like rubber sheet S extruded by the first extruder 1 is attached to the outer surface of the rotating drum 3, and the rubber sheet S is wound around the rotating drum 3 so that the rubber sheet S rotates. Before being wound around the entire circumference of the drum 3, the front end part of the width direction of the rubber sheet S on the outer surface of the rotating drum 3 is attached to the inner peripheral surface side of the rotating bead core 8. S is wound around the inner peripheral surface side of the bead core 8. After the rubber sheet S is wound around the inner peripheral surface side of the bead core 8 over the entire circumference, the tip of the belt-shaped reinforcing rubber T extruded by the second extruder 2 is attached to the outer surface of the rotary drum 3 to reinforce it. The rubber T is wound around the rotating drum 3, and before the reinforcing rubber T is wound over the entire circumference of the rotating drum 3, a part of the distal end portion in the width direction of the reinforcing rubber T on the outer surface of the rotating drum 3. May be attached to the inner peripheral surface side of the rotating bead core 8, and the reinforcing rubber T may be wound around the inner peripheral surface side of the bead core 8. At this time, the step of winding up the remaining portion in the width direction of the rubber sheet S wound around the inner peripheral surface side of the bead core 8 along the cross-sectional shape of the bead core 8 and the reinforcing rubber T wound around the inner peripheral surface side of the bead core 6. Although the process of winding up the remainder of the width direction along the cross-sectional shape of the bead core 8 may be performed separately, it may be performed simultaneously. The bead core 8 coated with the rubber sheet S by the bead coating method according to the third embodiment has the form shown in FIG.

(Fourth embodiment)
In the second embodiment described above, the step of winding the reinforcing rubber T around the inner peripheral surface of the bead core 8 and the step of winding the rubber sheet S around the inner peripheral surface of the bead core 8 are performed simultaneously. Also good. Specifically, the tip of the reinforcing rubber T extruded by the first extruder 1 is attached to the outer surface of the rotating drum 3, and the reinforcing rubber T is wound around the rotating drum 3. Is attached to the inner peripheral surface side of the rotating bead core 8, and the reinforcing rubber T is attached to the inner peripheral surface side of the rotating bead core 8 on the outer surface of the rotating drum 3. Wrap around the inner peripheral surface of the bead core 8. After the reinforcing rubber T is wound around the inner peripheral surface side of the bead core 8 over the entire circumference, the tip of the belt-like rubber sheet S extruded by the second extruder 2 is attached to the outer surface of the rotary drum 3, and the rubber The sheet S is wound around the rotating drum 3, and before the rubber sheet S is wound over the entire circumference of the rotating drum 3, the front end part of the width direction of the rubber sheet S on the outer surface of the rotating drum 3 May be attached to the inner peripheral surface side of the rotating bead core 8, and the rubber sheet S may be wound around the inner peripheral surface side of the bead core 8. At this time, a step of winding up the remaining portion in the width direction of the reinforcing rubber T wound around the inner peripheral surface side of the bead core 8 along the cross-sectional shape of the bead core 8, and a rubber sheet S wound around the inner peripheral surface side of the bead core 6. Although the process of winding up the remainder of the width direction along the cross-sectional shape of the bead core 8 may be performed separately, it may be performed simultaneously. The bead core 8 coated with the rubber sheet S by the bead coating method according to the fourth embodiment has the form shown in FIG.

DESCRIPTION OF SYMBOLS 1 1st extruder 2 2nd extruder 3 Rotating drum 4 Covering apparatus 5 Control part 8 Bead core 11 Base 21 Base 31 Circumferential groove | channel 100 Bead core coating apparatus S Rubber sheet T Reinforcement rubber

Claims (12)

A bead core coating method for coating an annular bead core with a belt-shaped rubber sheet,
Pasting the tip of the belt-shaped rubber sheet extruded by the first extruder to the outer surface of the rotating drum, and winding the rubber sheet around the rotating drum;
Before the rubber sheet is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the rubber sheet in the width direction on the outer surface of the rotating drum. Pasting and winding the rubber sheet around the inner peripheral surface of the bead core;
A step of affixing a distal end portion of a belt-like reinforcing rubber extruded by a second extruder to the outer surface of the rotating drum, and winding the reinforcing rubber around the rotating drum;
Before the reinforcing rubber is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Pasting and winding the reinforcing rubber around the inner peripheral surface of the bead core;
Winding the rubber sheet wound around the inner peripheral surface side of the bead core and the remaining portion of the reinforcing rubber in the width direction along the cross-sectional shape of the bead core. The step of winding the reinforcing rubber around the rotating drum includes affixing the tip of the belt-like reinforcing rubber extruded by a second extruder to the tip of the rubber sheet on the outer surface of the rotating drum. A step of winding rubber around the rotating drum;
The step of winding the rubber sheet around the inner peripheral surface side of the bead core and the step of winding the reinforcing rubber around the inner peripheral surface side of the bead core include winding the rubber sheet and the reinforcing rubber over the entire circumference of the rotating drum. Before being applied, the front end part of the width direction of the reinforcing rubber on the outer surface of the rotating drum is attached to the inner peripheral surface side of the rotating bead core, and the rubber sheet and the reinforcing rubber are integrated as a unit. The bead core coating method according to claim 1, wherein the bead core coating method is a step of winding around the inner peripheral surface side of the bead core.   The bead core coating method according to claim 2, wherein the reinforcing rubber is wound so as to be positioned at a central portion in the width direction of the rubber sheet on the outer surface of the rotating drum. A bead core coating method for coating an annular bead core with a belt-shaped rubber sheet,
A step of attaching the tip of a belt-like reinforcing rubber extruded by the first extruder to the outer surface of the rotating drum, and winding the reinforcing rubber around the rotating drum;
Before the reinforcing rubber is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Pasting and winding the reinforcing rubber around the inner peripheral surface of the bead core;
A step of affixing the tip of the belt-like rubber sheet extruded by the second extruder to the outer surface of the rotating drum, and winding the rubber sheet around the rotating drum;
Before the rubber sheet is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the rubber sheet in the width direction on the outer surface of the rotating drum. Pasting and winding the rubber sheet around the inner peripheral surface of the bead core;
Winding the reinforcing rubber wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the rubber sheet along the cross-sectional shape of the bead core. The step of winding the rubber sheet around the rotating drum includes affixing the front end of the belt-shaped rubber sheet extruded by a second extruder to the front end of the reinforcing rubber on the outer surface of the rotary drum, A step of winding a sheet around the rotating drum,
The step of winding the reinforcing rubber around the inner peripheral surface side of the bead core and the step of winding the rubber sheet around the inner peripheral surface side of the bead core include winding the reinforcing rubber and the rubber sheet over the entire circumference of the rotating drum. Before being applied, a part of the front end of the rubber sheet in the width direction on the outer surface of the rotating drum is attached to the inner peripheral surface side of the rotating bead core, and the reinforcing rubber and the rubber sheet are integrated as a unit. The bead core coating method according to claim 4, wherein the bead core coating method is a step of winding around the inner peripheral surface side of the bead core.   The bead core coating method according to claim 5, wherein the rubber sheet is wound so that the reinforcing rubber on the outer surface of the rotating drum is positioned at a central portion in the width direction of the rubber sheet. In the step of winding the reinforcing rubber around the rotating drum, the reinforcing rubber is wound in a circumferential groove formed along the circumferential direction on the outer surface of the rotating drum,
The bead core coating method according to claim 4, wherein a cross-sectional shape of the circumferential groove is the same as a cross-sectional shape of the reinforcing rubber. A bead core coating apparatus for coating an annular bead core with a belt-shaped rubber sheet,
A first extruder for extruding the rubber sheet;
A second extruder for extruding the reinforcing rubber;
A rotating drum for winding the rubber sheet extruded from the first extruder and the reinforcing rubber extruded from the second extruder;
The bead core is supported such that the outer surface of the rotating drum and the inner peripheral surface of the bead core are close to each other at a position downstream of the second extruder in the rotation direction of the rotating drum, and the supported bead core is rotated. A covering device;
A controller that controls the first extruder, the second extruder, the rotating drum, and the covering device,
The control unit affixes the tip of the belt-shaped rubber sheet extruded from the first extruder to the outer surface of the rotating drum, winds the rubber sheet around the rotating drum,
Before the rubber sheet is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the rubber sheet in the width direction on the outer surface of the rotating drum. Pasting, winding the rubber sheet around the inner peripheral surface of the bead core,
Affixed to the outer surface of the rotating drum is a belt-shaped tip of the reinforcing rubber extruded from the second extruder, and the reinforcing rubber is wound around the rotating drum,
Before the reinforcing rubber is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Paste, wind the reinforcing rubber around the inner peripheral surface side of the bead core,
The bead core coating apparatus, wherein the rubber sheet wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the reinforcing rubber are wound up along the cross-sectional shape of the bead core. The control unit affixes the tip of the belt-shaped rubber sheet extruded from the first extruder to the outer surface of the rotating drum, winds the rubber sheet around the rotating drum,
Sticking the tip of the belt-like reinforcing rubber extruded from the second extruder to the tip of the rubber sheet on the outer surface of the rotating drum, and winding the reinforcing rubber around the rotating drum;
Before the rubber sheet and the reinforcing rubber are wound around the entire circumference of the rotating drum, an inner portion of the bead core that rotates a part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Affixed to the peripheral surface side, the rubber sheet and the reinforcing rubber are integrally wound around the inner peripheral surface side of the bead core,
The bead coating apparatus according to claim 8, wherein the rubber sheet wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the reinforcing rubber are wound up along the cross-sectional shape of the bead core. A bead core coating apparatus for coating an annular bead core with a belt-shaped rubber sheet,
A first extruder for extruding the reinforcing rubber;
A second extruder for extruding the rubber sheet;
A rotating drum for winding the reinforcing rubber extruded from the first extruder and the rubber sheet extruded from the second extruder;
The bead core is supported such that the outer surface of the rotating drum and the inner peripheral surface of the bead core are close to each other at a position downstream of the second extruder in the rotation direction of the rotating drum, and the supported bead core is rotated. A covering device;
A controller that controls the first extruder, the second extruder, the rotating drum, and the covering device,
The control unit affixed to the outer surface of the rotary drum the band-shaped tip of the reinforcing rubber extruded from the first extruder, wound the reinforcing rubber around the rotary drum,
Before the reinforcing rubber is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the reinforcing rubber in the width direction on the outer surface of the rotating drum. Paste, wind the reinforcing rubber around the inner peripheral surface side of the bead core,
Affixing the tip of the belt-shaped rubber sheet extruded from the second extruder to the outer surface of the rotating drum, winding the rubber sheet around the rotating drum,
Before the rubber sheet is wound over the entire circumference of the rotating drum, on the inner peripheral surface side of the bead core that rotates the front end part of the rubber sheet in the width direction on the outer surface of the rotating drum. Pasting, winding the rubber sheet around the inner peripheral surface of the bead core,
The bead core coating apparatus, wherein the reinforcing rubber wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the rubber sheet are rolled up along the cross-sectional shape of the bead core. The control unit affixed to the outer surface of the rotary drum the band-shaped tip of the reinforcing rubber extruded from the first extruder, wound the reinforcing rubber around the rotary drum,
Sticking the tip of the belt-like rubber sheet extruded from the second extruder to the tip of the reinforcing rubber on the outer surface of the rotating drum, and winding the rubber sheet around the rotating drum;
Before the reinforcing rubber and the rubber sheet are wound around the entire circumference of the rotating drum, the inside of the bead core that rotates the tip part of the width direction of the rubber sheet on the outer surface of the rotating drum. Affixed to the peripheral surface side, the reinforcing rubber and the rubber sheet are integrally wound around the inner peripheral side surface of the bead core,
The bead core coating apparatus according to claim 10, wherein the reinforcing rubber wound around the inner peripheral surface side of the bead core and the remaining portion in the width direction of the rubber sheet are wound up along the cross-sectional shape of the bead core. A circumferential groove is formed along the circumferential direction on the outer surface of the rotating drum,
The bead core coating apparatus according to claim 11, wherein a cross-sectional shape of the circumferential groove is the same as a cross-sectional shape of the reinforcing rubber.

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