Wire reciprocating device

A wire reciprocating device, comprising:

• a pair of guide members;
• a reel drum provided between the guide members;
• wires wound around the guide members and connected to the reel drum to be reeled onto the reel drum in directions opposite to each other;
• a moving body connected to the wires and reciprocated by rotating the reel drum in a direction and a direction opposite thereto to rotationally run and reciprocate the wires;
• a pair of tension rollers pressed onto respective portions of the wires extending from the reel drum in directions opposite to each other;
• roller holders rotatably supporting the respective tension rollers;
• and
• a tensioner case provided in the vicinity of the reel drum and including a biasing unit for biasing the roller holders in directions that the respective tension rollers are pressed onto the rollers, the tensioner case allowing the tension rollers and the roller holders to move in directions substantially orthogonal to the respective wires when the wires are tensioned.