| 摘要 |
An upstream side wheel Ha including grippers B which do not perform opening and closing operations for themselves, and a downstream side wheel Hb including grippers A each having an opening and closing mechanism are included, and in a delivery position in which both the wheels are adjacent to each other, a plastic bottle 1 is delivered from the gripper B to the gripper A. Here, if the upstream side wheel or the downstream side wheel abnormally stops, control means controls retreating means C provided at the downstream side wheel to switch the grippers A to a retreat state from a use state to make an opening degree of a first and second grip members 23 and 24 of each of the grippers A larger than an opening degree of both the grip members in the use state. Thereby, interference of the plastic bottles gripped by the upstream side grippers and the first and second grip members can be prevented. Even if one of the wheels abnormally stops, the other wheel can be continuously operated without increasing the equipment in size.
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