Patent ID: 7768877
Filing Date: 2010-08-03
Classification: G11B

Abstract:
1. A transfer control device to control an unloading unit that is driven to unload a disc article to be unloaded from a casing through an opening such that the center of the disc article is moved along a reference movement path along a direction of a diameter of the disc article, the transfer control device comprising: a detector to detect a difference of a moving path of the center of the disc article relative to the reference movement path of the disc article; and a driving controller to control the drive of the unloading unit according to a detection status of the disc article by the detector, wherein the detector includes; a first pair of sensors that are equidistantly disposed relative to the reference movement path, the first pair of sensors being disposed such that: when the disc article is loaded at a load completion position, the first pair of sensors are in a non-detection state of not sensing the disc article and then turn to a detection state of sensing the disc article; and when the disc article is unloaded to a predetermined remove position after the disc article is moved along the reference movement path, the first pair of sensors substantially simultaneously return from the detection state to the non-detection state; wherein while moving the disc article, the driving controller recognizes a time difference between a time point at which one of the first pair of sensors turns from the non-detection state to the detection state and another time point at which the other of the first pair of sensors turns from the non-detection state to the detection state after the one of the first pair of sensors turns, and, when the recognized time difference is equal to or less than a predefined period of time, the driving controller stops the drive of the unloading unit when the first pair of sensors substantially simultaneously turn from the non-detection state to the detection state, but when the recognized time difference is greater than the predefined period of time, then, after a predetermined time interval elapses after the other of the first pair of sensors turns from the detection state to the non-detection state, the driving controller stops the drive of the unloading unit.