To cope with deterioration of durability of an endless belt element by crowning in the endless block belt having a block element and the endless belt element in which the crowning is performed to suppress a disorder of lateral directional positions of a series of the block elements.
The crowning of the endless belt element supporting surface of the block element to an intermediate height is performed only for a part of a width direction region of the endless belt element supporting surface. A load operating at the endless belt element is uniformly held as much as possible in the overall area of its section, and a crowning guiding action necessary between the block element and the endless belt element is obtained by holding the overall area of the section of the load which operates the endless belt element uniform as much as possible.
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AZUMA HITOSHI
KOBAYASHI DAISUKE
