Abstract: A tire shaping drum has a central axle, a drum part which is capable of expansion and contraction, and a expanding/contracting means for changing the drum part. In the drum part, first segments having first end faces at both ends in the circumferential direction, and second segments having second end faces at both ends in the circumferential direction, are alternately seriated. There is provided with a backlash prevention means for preventing backlash between the contacting first end faces and second end faces when the drum part is in a diameter expanded state. Consequently, the first end faces and the second end faces closely contact with each other, and changes in the circularity of the drum part and the outer diameter of the drum part can be prevented.

Abstract: A three-dimensional printer device includes a supplying apparatus, a formation table, a recycling trough, a distribution apparatus, a power collection cover, and a control unit. The supplying apparatus is provided to contain the powder material. The formation table has a horizontal surface, and one side of the horizontal surface is disposed adjacent to the supplying apparatus. The recycling trough has an opening, the opening is disposed at the other side of the horizontal surface opposite to the supplying apparatus. The distribution apparatus includes a roller; the roller is movable across the horizontal surface between the supplying apparatus and the recycling trough, so that the powder material inside the supplying apparatus can be distributed onto the horizontal surface. The powder collection cover covers the roller. The control unit is electrically connected to the distribution apparatus and controls the roller to move between the supplying apparatus and the recycling trough.