General-purpose jig

A general-purpose jig comprising:

• a base;
• a locational holding device mounted on said base, and comprising a tripod robot that includes three expansion actuators;
• and
• a clamp attached to said locational holding device;
• wherein a position of said clamp can be changed by changing a length of each of said expansion actuators, depending upon an object to be held, according to a command from a control device;
• wherein said tripod robot further includes a lower substrate, an upper substrate, and a rotation inhibiting mechanism provided between said lower substrate and said upper substrate for inhibiting torsional rotation of the lower and upper substrates relative to each other, said three expansion actuators being located between said lower substrate and said upper substrate;
• and
• wherein said rotation inhibiting mechanism comprises two parallel sleeves that are connected to said lower substrate with two degrees of freedom and spaced apart from each other by a predetermined distance, and two slide rods that are fixed to said upper substrate and extend in parallel with each other, such that the two slide rods are guided by said two parallel sleeves, respectively.