Patent ID: 7261031

Claim:
An actuating device, comprising: a fixed rail; a moving body being guided by said rail; a contact body contacting said rail; and a pressure unit being provided to said moving body, said pressure unit always biasing said contact body toward said rail or in a pressing direction, wherein said pressure unit comprises: a rod having one end, which directly or indirectly contacts said moving body, and the other end, the rod being capable of moving in the pressing direction; a first biasing member biasing the rod in the pressing direction; a casing covering at least a part of an outer circumferential face of the rod, the casing having an inner circumferential face, whose distance from the outer circumferential face of the rod is gradually reduced toward the other end of the rod; and a spherical body being provided in the casing, the spherical body contacting the inner circumferential face of the casing and the outer circumferential face of the rod.