JP5604224B2 - Method for molding tire component and tire molding drum - Google Patents

Description

  The present invention relates to a drum constituent member molding method and a tire molding drum in which a sheet constituent material is wound around an outer peripheral surface to form a drum constituent member.

  Conventionally, for example, Patent Literature 1 discloses a method for molding a tire component and a tire molding drum. In this prior art, in order to prevent the sheet-like material wound around the outer peripheral surface of the tire-forming drum from being displaced or dropped, at least a part of the locking claw having a tip shape capable of piercing the sheet-like material is formed on the molding drum. It is arranged to be movable between an operating position that protrudes outward in the drum radial direction from the outer peripheral surface and a rest position that is entirely stored in the drum.

JP 2006-264049 A

  However, in Patent Document 1, the pushing of the locking claw provided on the tire molding drum is performed by, for example, a piston operated by air pressure or hydraulic pressure, or a cam or link mechanism linked to the drum rotation shaft, or a driving means such as a motor. It is necessary to use it. For this reason, the configuration of the apparatus becomes complicated and the cost increases.

  In view of the above problems, an object of the present invention is to provide a method for molding a tire constituent member and a tire molding drum that can easily prevent the sheet-like material from shifting or dropping.

According to a first aspect of the present invention, there is provided a method for molding a tire component member comprising: a tire molding drum in which a plurality of stab-like protrusions that are inclined in a normal rotation direction are erected on the entire circumferential direction of an outer peripheral surface ; The sheet-like material is wound around the outer peripheral surface of the tire molding drum while rotating in the direction, and the sheet-like material is held on the outer peripheral surface of the tire molding drum by piercing the sheet-like material.

In the method for molding a tire constituent member according to claim 1, a tire molding drum in which a plurality of stab-like projections inclined in the normal rotation direction is provided in the entire circumferential direction of the outer peripheral surface is rotated in the normal rotation direction. The sheet material is wound around the outer peripheral surface of the tire molding drum. At this time, the sheet-like material is held on the outer peripheral surface of the tire molding drum by piercing the sheet-like material with a plurality of stab-like projections erected in the entire circumferential direction of the outer peripheral surface of the tire molding drum. For this reason, the shift | offset | difference and fall of a sheet-like material can be prevented easily.

  According to a second aspect of the present invention, in the method for molding a tire constituent member according to the first aspect, after the tire constituent member is molded by joining both end portions of the sheet-like material, the tire constituent member is held. In a state, the tire molding drum is rotated in the reverse direction while reducing the diameter of the tire molding drum, the plurality of barb protrusions are extracted from the tire component, and the tire component is removed from the tire molding drum.

  According to the method for molding a drum component according to claim 2, after the tire component is molded by joining both ends of the sheet-like material, the diameter of the tire molding drum is reduced while the tire component is held. The tire molding drum is rotated in the reverse rotation direction while removing the plurality of stab-like projections from the tire constituent member, and the tire constituent member is removed from the tire molding drum. For this reason, the tire constituent member and the tire molding drum are not in close contact with each other, and the tire constituent member can be easily detached from the tire molding drum.

  According to a third aspect of the present invention, in the method for molding a tire constituent member according to the first or second aspect, the sheet-like material is formed by rubber coating a plurality of cords inclined with respect to the tire equatorial plane. It is a crossing belt.

  According to the method for molding a drum constituent member according to claim 3, since the sheet-like material is a cross belt formed by rubber coating a plurality of cords inclined with respect to the tire equatorial plane, the cross belt layer can be easily formed. Can be molded.

According to a fourth aspect of the present invention, there is provided a tire molding drum according to the present invention, comprising: a drum body capable of normal rotation and reverse rotation; And a protrusion.

  In the tire molding drum according to claim 4, a plurality of stab-like protrusions inclined in the normal rotation direction are erected over the entire circumferential direction of the outer peripheral surface of the drum body capable of normal rotation and reverse rotation. The stab-like projections are stuck in the sheet-like material wound around the outer peripheral surface of the tire molding drum, whereby the sheet-like material can be held on the outer peripheral surface of the tire molding drum. As a result, it is possible to easily prevent the sheet-like material from shifting or dropping.

  Since the molding method of the tire constituent member according to the first aspect of the present invention is the above-described method, it is possible to easily prevent the sheet-like material from being displaced or dropped.

  Since the method for molding a tire constituent member according to the second aspect of the present invention is the above method, the tire constituent member can be easily detached from the tire molding drum.

  Since the molding method of the tire constituent member according to the third aspect of the present invention is the above-described method, the crossing belt layer can be easily molded.

  Since the tire molding drum according to the fourth aspect of the present invention has the above-described configuration, it is possible to easily prevent the sheet-like material from being displaced or dropped.

It is a schematic perspective view which shows the winding method in the shaping | molding method of the tire structural member of one Embodiment in this invention. It is a schematic perspective view which shows the winding completion state in the shaping | molding method of the tire structural member of one Embodiment in this invention. FIG. 3 is an enlarged cross-sectional view taken along a line 3-3 in FIG. 1. It is an enlarged side view which shows the stab-like protrusion of the tire molding drum of one Embodiment in this invention. It is the schematic sectional side view which abbreviate | omitted hatching which shows the removal method in the shaping | molding method of the tire structural member of one Embodiment in this invention. It is an expanded sectional side view which abbreviate | omitted hatching which shows the removal method in the shaping | molding method of the tire structural member of one Embodiment in this invention.

  Hereinafter, one embodiment of a method for molding a tire constituent member and a tire molding drum according to the present invention will be described with reference to FIGS.

(Tire molding drum)
As shown in FIG. 1, the drum body 20 of the tire molding drum 10 of the present embodiment is attached to a rotating shaft 22, and the rotating shaft 22 operates in the normal rotation direction (not shown) by operating a driving device (not shown). 1 arrow a direction) and opposite the rolling direction (and is rotatable f direction of arrow B) and FIG. A plurality of barb projections 24 are formed on the outer peripheral surface 20 </ b> A of the drum main body 20 of the tire molding drum 10 in the entire circumferential direction excluding both ends of the drum main body 20. The normal rotation direction is the rotation direction when the sheet-like material is wound around the outer peripheral surface 20A of the drum body 20.

  As shown in FIG. 2, the stab protrusion 24 is formed in the range of the width W1 along the axis 10A of the tire molding drum 10 on the outer peripheral surface 20A of the tire molding drum 10, and the width W1 of the stab protrusion 24 is It is wider than the width W2 of the sheet-like material 12 (W1> W2).

  As shown in FIG. 4, the stab-like protrusion 24 is inclined in the normal rotation direction of the tire molding drum 10 (the direction of arrow A in FIG. 4). More specifically, the stab-like protrusion 24 has a conical shape, and a center line 24D extending from the tip 24A to the center 24C of the circular lower surface 24B is a forward rotation direction of the tire molding drum 10 (arrow A in FIG. 4). The outer peripheral line 24F that is inclined (inclination angle θ1) and extends from the tip 24A to the tip 24E in the forward direction of the lower surface 24B is directed in the forward direction of the tire molding drum 10 (the direction of arrow A in FIG. 4). It is inclined (inclination angle θ2).

  Therefore, when the tire molding drum 10 is rotated in the normal rotation direction (arrow A direction in FIG. 4) and the sheet-like material 12 is wound around the tire molding drum 10, the normal rotation direction of the tire molding drum 10 (arrow in FIG. 4). The conveyance speed V2 of the sheet-like material 12 is slowed (V1> V2) with respect to the rotation speed V1 in the A direction), and tension is applied to the sheet-like material 12, so that the tip 24A of the stab-like protrusion 24 is The back surface 12A of the sheet-like material 12 is stabbed, and the stab-like projection 24 bites into the sheet-like material 12.

  As shown in FIG. 5, a plurality of arms 40 of the tire constituent member holding device for holding the tire constituent member 30 are arranged on the outer peripheral side of the tire molding drum 10 at predetermined intervals in the circumferential direction.

  The basic configuration of the tire component holding device is that the plurality of arms 40 are held at a holding position (a position indicated by a solid line in FIG. 5) for holding the outer peripheral portion 30 </ b> A of the tire component 30 and the outer periphery of the tire component 30. Since it is a well-known configuration that has been conventionally used to move to a standby position (a position indicated by a two-dot chain line in FIG. 5) that is separated from the portion 30 </ b> A, detailed description thereof is omitted.

  The basic structure of the drum body 20 in the tire molding drum 10 is a well-known structure that has been conventionally used in which a plurality of segments are provided so as to be able to expand and contract, and the outer peripheral surface 20A of the drum body 20 is expanded and contracted. Description is omitted.

(Tire component forming method)
As shown in FIG. 1, in the present embodiment, the tire molding drum 10 is rotated in the normal rotation direction (the direction of arrow A in FIG. 4), and the sheet-like material 12 is centered in the width direction of the outer peripheral portion of the tire molding drum 10. Wrap around. The sheet material 12 is conveyed from a server (not shown) by the rollers 14, 16, and 18 in the direction of arrow D in FIG. 1 and supplied onto the outer peripheral surface 20 </ b> A of the drum body 20 of the tire molding drum 10.

  At this time, the conveyance speed V2 of the sheet-like material 12 is slowed (V1> V2) with respect to the rotational speed V1 of the tire molding drum 10 in the normal rotation direction (the direction of arrow A in FIG. 4), and the sheet-like material 12 is obtained. Apply tension to the. Accordingly, the tip 24A of the stab protrusion 24 formed on the outer peripheral portion 20A of the drum body 20 of the tire molding drum 10 pierces the back surface 12A of the sheet material 12, and the stab protrusion 24 bites into the sheet material 12. .

  Next, when the supply of the sheet-like material 12 is continued while the tire molding drum 10 is rotated forward, the sheet-like material 12 is wound along the outer peripheral surface of the tire molding drum 10. Then, the tire molding drum 10 is rotated approximately once, and the rear end portion of the sheet-like material 12 is placed on the front end portion of the sheet-like material 12 already wound around the tire molding drum 10. When the leading end and the trailing end of the sheet-like material 12 are joined using a stitcher roll or the like in this state, a cylindrical tire constituent member 30 is molded on the tire molding drum 10 as shown in FIG.

  Next, as shown in FIG. 5, the arm 40 of the tire component holding device is moved from the standby position (position shown by a two-dot chain line in FIG. 5) to the holding position (position shown by a solid line in FIG. 5), The structural member 30 is held. In this state, the tire molding drum 10 is rotated in the reverse rotation direction (arrow B direction in FIG. 5), and at the same time, the outer peripheral surface 20A of the drum body 20 is contracted in the direction approaching the rotation shaft 22 (arrow C direction in FIG. 5). Diameter. As a result, as shown in FIG. 6, the stab-like projections 24 of the tire molding drum 10 come out from the back surface of the tire constituent member 30.

  Next, the tire constituent member 30 held by the arm 40 of the tire constituent member holding device is moved in the axial direction of the rotation shaft 22 of the tire forming drum 10 with respect to the tire forming drum 10, so that the tire constituent member 30 is moved. Remove from the tire molding drum 10.

(Action / Effect)
In the present embodiment, the sheet-like material 24 is wound around the outer peripheral surface 20A of the drum main body 20 of the tire molding drum 10 while rotating the tire molding drum 10 in the normal rotation direction, so that the stab-like protrusions 24 of the tire molding drum 10 become sheets. The sheet-like material 12 can be held on the outer peripheral surface 20 </ b> A of the drum body 20 of the tire molding drum 10 by being stabbed into the sheet-like material 12. For this reason, the shift | offset | difference and fall of the sheet-like material 12 from the tire molding drum 10 can be prevented easily.

  Further, in the present embodiment, a stab-like protrusion 24 that is inclined in the normal rotation direction of the tire molding drum 10 is provided upright on the outer peripheral surface 20A of the drum body 20 of the tire molding drum 10. For this reason, the structure of the tire molding drum 10 is simplified and the cost is reduced as compared with the conventional technique in which the sheet-like material is held on the drum by the locking claw that moves between the operating position and the rest position.

  Further, in the present embodiment, as shown in FIGS. 5 and 6, the tire molding drum 10 is rotated in the reverse direction while reducing the diameter of the tire molding drum 10, and the stab protrusions 24 are removed from the tire constituent member 30. Thus, the tire constituent member 30 can be removed from the tire molding drum 10. For this reason, the tire constituent member 30 and the tire molding drum 10 are not in close contact with each other, and the tire constituent member 30 can be easily detached from the tire molding drum 10.

  In the present embodiment, the sheet-like material 12 has a plurality of cords 40 inclined with respect to the tire equatorial plane, as shown by broken lines in FIG. can do. For this reason, the crossing belt layer as the tire component 30 can be easily molded. The sheet material 12 is not limited to the cross belt.

(Other embodiments)
The embodiments of the present invention have been described above with reference to the embodiments. However, these embodiments are merely examples, and various modifications can be made without departing from the scope of the invention. It goes without saying that the scope of rights of the present invention is not limited to these embodiments. For example, in the above embodiment, the cone-shaped protrusion 24 is formed on the outer peripheral surface 20A of the drum body 20 of the tire molding drum 10. However, the shape of the protrusion 24 is not limited to the conical shape, and is a cylindrical shape. Other shapes such as a needle shape with a sharp tip may be used.

DESCRIPTION OF SYMBOLS 10 Tire molding drum 12 Sheet-like material 20 Drum main body 20A The outer peripheral surface of a drum main body 24 Stitch-like protrusion 30 Tire constituent member

Claims (4)

A sheet-shaped material is applied to the outer peripheral surface of the tire molding drum while rotating in the normal rotation direction a tire molding drum in which a plurality of stab-like protrusions that are inclined in the normal rotation direction are provided over the entire circumferential direction of the outer peripheral surface. A method for molding a tire constituent member that winds and pierces the sheet-like material with the plurality of stab-like protrusions and holds the sheet-like material on an outer peripheral surface of the tire molding drum.   After molding the tire component by joining both ends of the sheet-like material, while rotating the tire molding drum in the reverse direction while reducing the diameter of the tire molding drum while holding the tire component, The method for molding a tire constituent member according to claim 1, wherein the plurality of barb protrusions are extracted from the tire constituent member, and the tire constituent member is removed from the tire molding drum.   The method for molding a tire constituent member according to claim 1 or 2, wherein the sheet-like material is a cross belt formed by rubber coating a plurality of cords inclined with respect to the tire equatorial plane. A drum body capable of forward and reverse rotation,
A plurality of stab-like protrusions that are erected in the entire circumferential direction of the outer peripheral surface of the drum body and are inclined in the forward rotation direction ;
Tire molding drum having