Tyre element assembly drum

Abstract

The present invention provides a tyre element assembly drum capable of holding roundness even zooming radii of a segment mold. The drum forms the circular tyre element by winding tyre material on periphery surface of the drum. The drum comprises: a center shaft capable of being rotatably supported; a plurality of segment mold arranged surrounding the center shaft to form the periphery surface of the drum; a segment mold moving unit for moving the segment mold at drum neck in zoom manner. Each segment mold comprises a main segment mold slice moving in drum neck direction by using the segment mold moving unit; a bending segment mold slide capable of being fixed on a side edge on a side of main segment mold slide in circumferential direction in manner of cantilever and surrounding the axial line in the axial line of the drum. End of free end side of each bending segment mold slide is carried on outer surface of the main segment mold slide at other segment mold slide adjacent to the free end side, and is provided with a force applying unit for applying force on the bending segment mold slide to radial inner side of the drum.

Description

technical field [0001] The present invention relates to a building drum that contributes to high-precision molding of annular tire components such as tread rubber, inner liner, and / or sidewall rubber. Background technique [0002] Known following forming drum a1, for example as Image 6 As shown, it has an approximately cylindrical drum outer peripheral surface O, and an annular tread reinforcement layer B is formed by winding a belt-shaped tire material such as a belt layer or a belt layer of a pneumatic tire on the drum outer peripheral surface O. (Tire Component) (For example, refer to Patent Document 1). [0003] In addition, in recent years, the step of wrapping the tread rubber, inner liner, sidewall rubber, and tire by spirally winding an unvulcanized belt-shaped rubber belt s around the above-mentioned building drum a1 in a circumferential direction has also been carried out. A step of forming the loop cloth rubber (hereinafter, such a step is referred to as a tape ...

AI Technical Summary

Problems solved by technology

[0008] However, in the above-mentioned forming drum a2, although it is small, there is a gap between the split molds, so there is still room for improvement.

[0009] In addition, in the case where the outer diameter d1 is reduced by using only the first split mold c1, the number of divisions of the outer peripheral surface O of the drum is reduced to half of that in the enlarged diameter state, and the roundness may be reduced so that the tread reinforcement layer B The forming accuracy deteriorates

In particular, in such a small-diameter state with low roundness, the roller r pressing the rubber tape s frequently jumps up and down due to the unevenness of the forming drum during the tape winding process, and the rubber tape may not be sufficiently pressed. Deterioration of molding accuracy of rubber parts

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