| 摘要 |
There are provided a first belt-clutch mechanism switching power transmission to a first large-diameter pulley, and, at the same time, a second belt clutch mechanism switching power transmission to a second large-diameter pulley, and a first and a second belt clutch mechanism are provided with a first and a second arm members, tension clutch pulleys installed at point portions of these arm members, and actuators which rotate a first and a second arm members in such a way that a position at which a first no-end belt is wound on the first large-diameter pulley is switched to a position at which winding is avoided, and, at the same time, a position at which a second no-end belt is wound on a second large-diameter pulley is switched to a position at which winding is avoided.
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