PROBLEM TO BE SOLVED: To provide a knot formation device with which a knot can be automatically formed by a simple procedure.SOLUTION: A knot M can be automatically formed in a string-shaped member L by passing a first position through a loop R by sequentially performing, through operation of an operation member 16: a first loop formation operation by which a first arm mechanism 14a and a second arm mechanism 14b are separated from each other so as to form the loop of the string-shaped member L by arm bodies 36a, 36b an arm approach operation by which the first arm mechanism 14a and the second arm mechanism 14b approach each other a first switching operation of switching from a state where the first position and a second position of the string-shaped member L are held by a first holding member and a fourth holding member to a state where they are held by a second holding member and a third holding member and a first arm separation operation by which the first arm mechanism 14a and the second arm mechanism 14b are separated from each other in the state where the first position and the second position of the string-shaped member L are held by the second holding member and the third holding member.SELECTED DRAWING: Figure 21COPYRIGHT: (C)2017,JPO&INPIT【課題】単純な操作で自動的に結び目を形成することができる結び目形成装置を提供する。【解決手段】操作部材16の操作により、第1アーム機構14aおよび第2アーム機構14bを相互に離間させ、アーム本体36a、36bにより糸状部材Lのループを形成させる第1ループ形成操作と、第1アーム機構14aおよび第2アーム機構14bを相互に接近させるアーム接近操作と、糸状部材Lの第1位置と第2位置を第1保持部材と第4保持部材により保持する状態から前記第2保持部材と第3保持部材により保持する状態へ切り替える第1切替操作と、糸状部材Lの第1位置と第2位置とを前記第2保持部材と第3保持部材とにより保持する状態で前記第1アーム機構14aおよび第2アーム機構14bを相互に離間させる第1アーム離間操作とを順次実行することにより、第1位置をループRに通過させて糸状部材Lに結び目Mを、自動的に形成することができる。【選択図】図21
