| 摘要 |
Tire building drum with turn-up apparatus for building an unvulcanized tire with tire components (1, 2) and two bead cores (3, 4) with high bead filling strips (4'). Said drum has two ring segments (6, 7) spaced from each other in order to support a bead core, drum segments (8, 9, 10, 11, 12) placed on the outside of each ring segment in order to support the tire components. Said drum further has means to radially expand that part of the tire components which is situated between the ring segments. Said tire building drum has on both sides outside the ring segments a first and second set of axially extending, hingeable arms (11, 12, 17, 19) each having an end directed to the ring segment, said end having a roller (13, 14, 16, 18) and means to axially and radially move each set of arms from a first position in which the rollers of a set of arms form a virtually closed ring to a second position in order to press the expanded part of the tire components which is situated between the ring segments to the part of the tire components which is situated outside the ring segments. Each roller (16, 18) of an arm (17, 19) of the second set is situated between two adjacent arms (13, 14) of said first set and situated on the side of the rollers of the arms of said first set which side is turned away from the ring segments. |
