Link actuating device

1. A link actuating device comprising:

a proximal end side link hub;

a distal end side link hub; and

three or more link mechanisms via which the distal end side link hub is coupled to the proximal end side link hub such that a posture of the distal end side link hub can be changed relative to the proximal end side link hub,

each of the link mechanisms including: a proximal side end link member rotatably coupled at one end thereof to the proximal end side link hub; a distal side end link member rotatably coupled at one end thereof to the distal end side link hub; and an intermediate link member rotatably coupled at both ends thereof to other ends of the proximal side and distal side end link members;

a posture control drive source is provided to each of two or more link mechanisms of the three or more link mechanisms and configured to arbitrarily change the posture of the distal end side link hub relative to the proximal end side link hub;

a storage unit configured to store therein an operating position of the posture control drive source when the distal end side link hub is in a defined posture relative to the proximal end side link hub;

a positioning member configured to position the distal end side link hub in the defined posture by restricting postures of a plurality of the link members relative to each other, the positioning member being provided to at least one link member of the proximal side end link member, the distal side end link member, and the intermediate link member in each of the two or more link mechanisms of the three or more link mechanisms; and

a positioning portion on which the positioning member is detachably mounted.

2. The link actuating device as claimed in claim 1 , wherein the positioning portion is provided to the intermediate link member.

3. The link actuating device as claimed in claim 2 , wherein the positioning portion is a through hole into which the positioning member is able to be inserted, and a central axis of the through hole passes through a plane including a point at which a central axis of a revolute pair between the proximal side end link member and the intermediate link member of each link mechanism and a central axis of a revolute pair between the distal side end link member and the intermediate link member of each link mechanism intersect each other, and intersects a point of intersection between a central axis of the proximal end side link hub and a central axis of the distal end side link hub.

4. The link actuating device as claimed in claim 3 , wherein the positioning member includes two or more positioning member divided bodies each of which can be inserted into the one positioning portion, and the two or more positioning member divided bodies are coupled to each other in a fixed state via a connection member.

5. The link actuating device as claimed in claim 4 , wherein one positioning member divided body of the two or more positioning member divided bodies is formed so as to be integrated with the connection member.

6. The link actuating device as claimed in claim 2 , wherein the positioning member is detachably mounted between the two positioning portions provided to the adjacent two intermediate link members, respectively.

7. The link actuating device as claimed in claim 6 , wherein

another positioning portion composed of a through hole or a recess is provided to another intermediate link member other than the adjacent two intermediate link members, and

the positioning member has a projection portion configured to restrict postures of the adjacent two intermediate link members and such another intermediate link member relative to each other by being inserted into such another positioning portion.

8. The link actuating device as claimed in claim 1 , wherein

the posture control drive source is a rotary actuator, and

the storage unit stores therein a rotation angle of the posture control drive source when torque is applied in a state where the distal end side link hub is in an origin posture.