Tyre building drum having a turn-up device

摘要

A tire element turn-up device in a tire molding drum comprises; bead lock segments (6), each supporting an end portion (A1) of tire element (A) and being expansible and contractible in a radial direction; a bead lock expanding and contracting means (7,8) for expanding and contracting each said bead lock segment (6) in the radial direction by reciprocal movement; a cylindrical moving means (11) movable in an axial direction relative to said bead lock expanding and contracting means (7,8); fingers (9), each pivoted to said cylindrical moving means (11) turnably around a pivotal fulcrum in the radial direction so that its front end portion abuts on the end portion (A1) of the tire element (A); and a finger expanding and contracting means (15,16) for expanding and contracting each said finger (9) by movement in the axial direction so as to move the front end of each said finger (9) in the radial direction, thus the end portion (A1) of the tire element (A) is turned-up by cooperative movement of said bead lock expanding and contracting means (7,8) and said finger expanding and contracting means (15,16).