Abstract: A library apparatus including a feeder mechanism for an accessor robot. The feeder mechanism includes a feeding cable for the accessor robot. The feeding cable has a first end and a second end. The first end is connected to the accessor robot, and the second end is connected to a reference position (e.g., a housing of the library apparatus). The feeding cable is wrapped around a cable drum. The cable drum is rotatably supported to an arm. A wire rope acts on the arm to apply a tension to the feeding cable. A stress removing mechanism for removing a torsional stress of the wire rope is connected to at least one end of the wire rope. The stress removing mechanism rotatably supports the wire rope. With this configuration, the torsional stress of the wire rope is removed to thereby improve fatigue characteristics or the like of the wire rope and accordingly improve the reliability of the library apparatus.

Abstract: A library apparatus having components permitting accurate and straightforward assembly. The library apparatus includes respective cell, drive, accessor and passage units, each having box shaped housings including a connection mechanism. A coupling couples the housings of the passage units with the other units. Other features of the library apparatus include a reference mark on the accessor unit which permits a transport mechanism in the passage unit to correct positional errors of the transport mechanism to other components.