Apparatus for forming a band of a radial tyre

摘要

(+03.07.87, 31.07.87, 29.09.87, 31.03.88 -JP- 167435, 193523, 244774, 080495) A pneumatic radial tyre has a belt disposed outside a carcass in the radial direction of the tyre and a band disposed outside the belt in the radial direction of the tyre and the band consists of one or a number of continuous organic fibre cords wound substantially in parallel and spirally in the circumferential direction of a tyre. Prodn. includes laminating a predetermd. number of belt plies on a belt ring or on a belt drum for moulding the belt and winding continuously and spirally one or a number of organic fibres cords on the outer peripheral surface of the belt, on which the band is formed. The appts. comprises a device for paying out the cords to be wound, traverse device for traversing this pay-out means in the widthwise direction of the belt and traverse control device for controlling traverse of the delivery means. The method of moulding a belt-band-tread rubber assembly includes expanding the dia. of the belt drum so that the sectional shape of the belt drum in the axial direction is the same as, or approximate to, the final finish shape inside a vulcanisation mould for the band. The appts. for moulding this assembly is equipped with a contractile belt drum consisting of a stretchable annular member, made of an elastomer and contraction device for contracting the moulding annular member. The outer circumferential surface of the moulding annular member with its dia. expanded exhibits in its axial direction section, or approximate to, the final finish shape of the band inside the mould, and defines the winding surface of the band.