| 摘要 |
The invention relates to a tyre building drum (1) having tyre components thereon, wherein the tyre building drum is provided with a turn-up mechanism (6) for turning-up parts of the tyre components, wherein the turn-up mechanism comprises a group of arms (61) (62), wherein each group of arms comprises primary arms (61) and secondary arms (62) interposed between the primary arms, wherein, the primary arms and the secondary arms are provided with primary pressing elements (63) and secondary pressing elements (65), respectively, for exerting a pressing force onto the tyre components during the turning-up, wherein the primary pressing elements are in a leading position, wherein the secondary arms (62) are provided with actuators (68) which are arranged for displacing the secondary pressing elements from an axially trailing position with respect to the axial position of the primary pressing elements in the leading position towards the same axial position as the primary pressing elements in the leading position. |
