FIELD: tyre industry. SUBSTANCE: the drum has movable quadrants radially mounted on the drive shaft, mechanism for radial moving of the quadrants made in the form of levers hinge-joined to the quadrants with their one ends, and hinge-joined to the movable coaxially mounted hubs on the drive shaft with the other ends, and additional levers hinge-joined to the main ones and to rigidly fastened bushes on the drive shaft, and a mechanism drive using a motion screw coupled to the movable hubs. The drum is furnished with an additional motion screw. The output ends at least of two motion screws are installed in one of the bushes uniformly in its circumference. EFFECT: improved design. 1 dwg
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