The state in which the wire 51, the reciprocating member 55, the first urging member 53, the second urging member 54, the first urging member 53, and the second urging member 54 are urged is switched Switching members 57 and 59 and an operation member 52 for operating the switching members 57 and 59 by an external operation to move the reciprocating member 55 to the first movement position or the second movement position P 2.ワイヤ51と、往復移動部材55と、第1の付勢部材53と、第2の付勢部材54と、第1の付勢部材53および第2の付勢部材54が付勢する状態を切り替える切替部材57、59と、外部からの操作により、切替部材57、59を動作させ、往復移動部材55を第1の移動位置または第2の移動位置P2に移動させる操作部材52、を具備する。
