Device for turning up body ply

摘要

A body ply turn-up device for turning up at least one width-end portion of a body ply expanded into a toroidal shape includes a plurality of arm components movable in the axial direction of an operating shaft and pivotable radially of the operating shaft. Guide members are respectively supported on an end portion of each arm component and coil springs are interposed in respective spaces between guide members. Elastic members respectively cover the outer surfaces of the coil springs for performing pressing at spaces between spiral wire portions thereof when the arm components are pivoted radially outward of the operating shaft. Alternatively, the guide portions include portions which are smaller than the inner diameter of the coil spring and which extend to positions nearly touching each other at a center in a lengthwise direction of each coil spring in a state that the arm components are contracted.

主权项

1. A body ply turn-up device for turning up at least one of both width-end portions of a body ply expanded into a toroidal shape on an operating shaft to wrap a bead core set at at least one of axially opposite sides of an expanded portion of the body ply, the device comprising:
a plurality of arm components circumferentially arranged to be movable in the axial direction of the operating shaft and to be pivotable about respective first axes radially of the operating shaft; an extreme end portion of each arm component pivotably supporting a respective link member about a respective second axis, the first axis and the second axis of each arm component being parallel; guide members respectively supported at both of two circumferentially-facing sides of each link member on one of two longitudinal ends of each link member, each guide member being rotatable about a third axis parallel to the second axis on the same link member; coil springs which are attached at each of their ends to a respective one of the guide members such that the coil springs are interposed in respective spaces between circumferentially adjacent pairs of the link members; pressing members provided to supplementarily cover respective spaces between circumferentially adjacent ones of the coil springs and supported at respective other ends of the link members behind the coil springs to be rotatable about fourth axes each extending in parallel to the third axis on the same link member, wherein each of the pressing members is circumferentially positioned at the location of one of said spaces between circumferentially adjacent ones of the coil springs and has a circumferential width greater than the circumferential width of the corresponding one of said spaces between circumferentially adjacent ones of the coil springs; and elastic members comprising tubes whose inner surfaces respectively cover the outer surfaces of the coil springs for performing pressing at spaces between spiral wire portions thereof when the arm components are pivoted radially outward of the operating shaft, wherein each link member has its second axis located between its one end and its other end such that as the arm components pivot about their respective first axes the link members pivot about their respective second axes so that the coil springs and the pressing members are even in pressing force.