Drum half, tire building machine and method for operating said tire building machine

Abstract

The invention relates to a method for operating a tire building machine, wherein the tire building machine comprises a first drum half, wherein the first drum half comprises a base for mounting the first drum half to the drum shaft, wherein the base has a central axis that is arranged to coincide with the rotation axis, wherein the base is arranged to be movable over the drum shaft in the axial direction parallel to said central axis, wherein the first drum half is further provided with a turn-up section comprising a plurality of turn-up arms and an arm support, wherein the turn-up arms are rotatable with respect to the arm support from an arms-down position towards an arms-up position, wherein the method comprises the step of displacing the arm support such that each turn-up arm is turned-up into an intermediate position between the arms-down position and the arms-up position.

1 . A method for operating a tire building machine, wherein the tire building machine comprises a first drum half for together with a second drum half forming a tire building drum, wherein the tire building machine comprises a rotation axis and a drum shaft extending along the rotation axis for supporting said first drum half and said second drum half on opposite sides of a center of the tire building drum, wherein the first drum half comprises a base for mounting the first drum half to the drum shaft, wherein the base has a central axis that is arranged to coincide with the rotation axis, wherein the base is arranged to be movable over the drum shaft in the axial direction parallel to said central axis, wherein the first drum half is further provided with a turn-up section comprising a plurality of turn-up arms distributed circumferentially about said central axis and an arm support for supporting said turn-up arms with respect to the base, wherein the turn-up arms are rotatable with respect to the arm support from an arms-down position towards an arms-up position in response to a movement of the arm support in an arm drive direction, wherein the method comprises the step of displacing the arm support wherein each turn-up arm is turned-up into an intermediate position between the arms-down position and the arms-up position. 
     
     
         2 . The method according to  claim 1 , wherein first drum half comprises a crown-up section with a plurality of crown segments distributed circumferentially about said rotation axis and movable with respect to the base in a crown-up direction outwards in a radial direction with respect to the central axis from a crown-down position towards a crown-up position; wherein the turn-up arms are arranged for supporting one or more tire layers at the diameter of a circumferential surface of the tire building drum at the crown-up section. 
     
     
         3 . The method according to  claim 1 , wherein each turn-up arm in the intermediate position supports one or more layers during their application on a circumferential surface of the tire building drum. 
     
     
         4 . The method according to  claim 1 , wherein each turn-up arm in the intermediate position is used to provide additional support for one or more tire layers in case of high-pressure inflation of said one or more tire layers. 
     
     
         5 . The method according to  claim 2 , wherein the first drum half further comprises a bead-lock section that is located in the axial direction between the crown-up section and the turn-up section, wherein the bead-lock section comprises a plurality of bead-lock members distributed circumferentially about said central axis, wherein each turn-up arm in the intermediate position is used to provide additional support for a bead at the bead-lock member in the axial direction in case of high-pressure inflation of one or more tire layers. 
     
     
         6 . The method according to  claim 1 , wherein the one or more layers are one or more layers of a truck tire.