Patent ID: 7757738
Filing Date: 2010-07-20
Classification: B29D,B29L

Abstract:
1. A belt drum, particularly for shaping a belt layer and/or a tread layer or another tire component provided with metal parts into a circumferential whole, wherein the drum is rotatable about a center line, comprising a number of support members having a rigid support surface for the tire component and situated at the circumference of the drum, wherein considered in a cross-sectional plane containing the center line, the support members comprise middle support sections and side support sections movably connected thereto, wherein the middle sections of the support members are moveable by driven first movement assemblies between a first position, in which the respective support member forms a support surface that is parallel to the center line, and at least one second position, in which a substantially convex support surface is formed by the respective support member, wherein the first movement assemblies are connected to the middle support sections in order to at least keep them parallel to the center line in at least the one second position, and wherein the first movement assemblies comprise first cone members and second cone members, wherein the first cone members are situated radially within the second cone members and are moveable with a directional component in a direction parallel to the center line in order to radially displace the second cone members, and the support members are connected to the second cone members for movement thereby, said belt drum further being provided with second movement assemblies for moving the support members from a position that is radially retracted with respect to the center line to at least a position that is radially extended with respect to the center line, wherein the support members are movable by means of the second movement assemblies between both positions in a condition in which the support surfaces, considered in a cross-sectional plane containing the center line, are situated parallel to the center line, and wherein the second movement assemblies comprise third cone members and fourth cone members, wherein the third cone members are situated radially within the fourth cone members and are movable with a directional component in a direction parallel to the center line in order to radially displace the fourth cone members, wherein the support members are radially movable by the fourth cone members.