Clutch driver of emergency cut-off device

A clutch driver of an emergency cut-off device,

• the clutch driver driving a clutch,
• the clutch including
• an engaged body that rotates integrally with a first shaft and
• an engaging body that rotates integrally with a second shaft, includes a first screw thread on an outer peripheral surface of the engaging body, and is disengaged from the engaged body by being displaced in an axial direction in which an axis of the second shaft extends,
• the clutch driver comprising:
• a base located away from the clutch in a front-rear direction perpendicular to the axial direction;
• a puller extending in the front-rear direction and located between the first screw thread and the base, the puller including
• a front end portion including a second screw thread that is meshable with the first screw thread,
• an internal space that extends in the front-rear direction and is open rearward, and
• a stopper that is lockable to an operator of an actuator when the second screw thread is located away from the first screw thread;
• a pushing spring that biases the puller toward the first screw thread;
• an outside shaft located in the internal space of the puller so as to be slidable relative to the puller in the front-rear direction, the outside shaft including
• an internal space that extends in the front-rear direction and is open rearward and
• a rear end portion that penetrates the base and projects rearward from the base;
• an inside shaft that is located in the internal space of the outside shaft so as to be slidable relative to the outside shaft in the front-rear direction and is coupled to the puller so as to be displaced integrally with the puller in the front-rear direction, the inside shaft including a rear end portion that penetrates the base and projects rearward from the base;
• and
• a positioner that positions the outside shaft, wherein:
• the clutch driver becomes a stand-by state when the pushing spring is compressed, the second screw thread is separated from the first screw thread, and the operator advances to be locked to the stopper;
• the clutch driver becomes an operating state when the operator retreats to be separated from the stopper, the puller moves forward by the pushing spring, and the second screw thread meshes with the first screw thread;
• and
• when the clutch driver transitions from the stand-by state to the operating state, the positioner maintains a position of the outside shaft relative to the base in the front-rear direction.