BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a manufacturing method of a tire component and a manufacturing device of a tire component.

2. Description of Related Art

A pneumatic tire is manufactured by forming each tire component in advance such as an inner liner, a sidewall, a bead, and a tread, adhering these tire components in an unvulcanized state to build an unvulcanized tire called a green tire, and vulcanizing the unvulcanized tire. There is a case where each of these tire components is shaped by winding a sheet-like rubber member formed in a specified cross-sectional shape around an outer circumferential surface of a drum and joining ends of the sheet-like rubber member.

In JP-A-2000-280373, it is proposed that sheet-like rubber members, each of which has length corresponding to circumferential length of a single tire, are manufactured. Thereafter, in a manufacturing order of these sheet-like rubber members, the sheet-like rubber members, each of which has the length corresponding to the circumferential length of the single tire, are sequentially wound around winding means such as a winding roll with a liner being interposed between the sheet-like rubber members at specified space intervals. In a belt shaping process, the sheet-like rubber members, each of which has the length corresponding to the circumferential length of the single tire, are removed from the winding means and supplied to a belt drum, so as to form a belt.

However, in the case where the plural sheet.-like rubber members are wound around the single winding means as in Patent Literature described above, it is difficult to perfectly join joint portions of the plural sheet-like rubber members, which leads to a problem of a significantly reduced yield rate.

In the earnest investigation to improve the yield rate, the present inventor has found that, when the sheet-like rubber member was removed from a winding cylinder and wound around the drum, the sheet-like rubber member was possibly stretched and deformed by a tensile force that was applied in a longitudinal direction of the sheet-like rubber member (corresponding to a moving direction of the sheet-like rubber member), and an overlapping amount of the joint portion including the ends of the sheet-like rubber member was increased by this stretched deformation.

That is, in the case where the plural sheet-like rubber members are wound around the single winding means as in Patent Literature described above, a curvature of the sheet-like rubber member on an inner side wound around the winding means differs from a curvature of the sheet-like rubber member on an outer side wound around the winding means. Thus, an amount of the tensile force that is generated at the time when the sheet-like rubber member is removed from the winding means differs by the sheet-like rubber members. As a result, an amount of the stretched deformation varies by the sheet-like rubber members, and it is difficult to perfectly join the joint portion of each of the plural sheet-like rubber members.

In particular, in the case where each of the sheet-like rubber members has a parallelogram shape like a sheet-like belt, from which a belt is formed, a tip side (a winding start side) and a rear end side (a winding finish side) of the sheet-like belt are tapered and likely to be stretched and deformed. In addition, the joint portion is provided in an inclined side that is inclined with respect to a circumferential direction of the drum. Accordingly, as an angle of the inclined side with respect to the moving direction of the sheet-like rubber member is reduced, the sheet-like rubber member is more likely to be stretched and deformed, and the joint portion is extended. As a result, it is difficult to perfectly join the joint portion.

SUMMARY OF THE INVENTION

The present invention has been made in view of the above circumstance and therefore has a purpose of providing a manufacturing method of a tire component and a manufacturing device of a tire component capable of suppressing deformation of a sheet-like rubber member at the time when the sheet-like rubber member is removed from a winding cylinder and wound around a drum and capable of suppressing an overlapping amount in a joint portion from being increased.

A manufacturing method of a tire component according to the present invention includes adhering a sheet-like rubber member to an outer circumferential surface of a drum. In the manufacturing method of the tire component, the single sheet-like rubber member, from which the single tire component can be formed, is held on an outer circumferential surface of a winding cylinder. The sheet-like rubber member, which is held by the winding cylinder, is removed from the wind ,ng cylinder by rotation of the drum and is adhered to the outer circumferential surface of the drum, so as to manufacture a tire component.

A manufacturing device of a tire component according to the present invention manufactures a tire component by adhering a sheet-like rubber member to an outer circumferential surface of a drum. The manufacturing device of the tire component includes: a winding cylinder that holds the single sheet-like rubber member, from which the single tire component can be formed, on an outer circumferential surface of the winding cylinder; and a drum drive device that causes rotation of the drum, removes the sheet-like rubber member from the outer circumferential surface of the winding cylinder, and adheres the sheet-like rubber member to the outer circumferential surface of the drum.

