| 摘要 |
The receiving surface of a bearing 20 is divided into four segments including a first divided receiving surface which is the end surface of a gate 25, a second divided receiving surface, a third divided receiving surface and a fourth divided receiving surface. An extraction stopping protrusion 63 is projected upward on the outer face of the supporting shaft of the driving arm. In a state where the supporting shaft 6 is attached to the bearing 20, the extraction stopping protrusion 63 is located within the space between a pair of legs 26 of a gate 25.
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