Abstract: A rack•pinion mechanism in which strength of a member to form a rack can be secured and a member including a pinion can be securely moved in a predetermined direction, and an accessor and a magnetic tape apparatus each including the mechanism are provided. For this purpose, in a picker 22, a pair of projections 222a and 222b are formed to sandwich both side surfaces of a pinion 211, the projections 222a and 222b perpendicularly rising toward a base 21 and curving or bending in an intermediate position thereof; in the base 21, a pair of grooves 212a and 212b are formed on both sides of a rack 211 in a shape to engage with the projections 222a and 222b, a section sandwiched by the grooves 212a and 212b is an engage section 213 including the rack 211 in a center of a wide section 213a at a tip end thereof; and by engaging the projections 222a and 222b with the grooves 212a and 212b, the wide section 213a is held between the projections 222a and 222b.

Abstract: A rack•pinion mechanism in which strength of a member to form a rack can be secured and a member including a pinion can be securely moved in a predetermined direction, and an accessor and a magnetic tape apparatus each including the mechanism are provided. For this purpose, in a picker 22, a pair of projections 222a and 222b are formed to sandwich both side surfaces of a pinion 211, the projections 222a and 222b perpendicularly rising toward a base 21 and curving or bending in an intermediate position thereof; in the base 21, a pair of grooves 212a and 212b are formed on both sides of a rack 211 in a shape to engage with the projections 222a and 222b, a section sandwiched by the grooves 212a and 212b is an engage section 213 including the rack 211 in a center of a wide section 213a at a tip end thereof; and by engaging the projections 222a and 222b with the grooves 212a and 212b, the wide section 213a is held between the projections 222a and 222b.

Abstract: A stored object detecting device includes a transferring device and a detecting device. The transferring device fetches a first object from a storage cell and moves parallel to a first direction with the first object being held in a holding portion of the transferring device. The detecting device detects a second object stored in the storage cell. The detecting device is mounted to the transferring device such that the detecting device is offset parallel to the first direction from the transferring device.