| 摘要 |
A gear switching mechanism is pressed at the time the centering of disks having different diameters is finished. A disk recording and/or reproducing apparatus has a disk centering member having a disk abutment assembly and an operating member, and angularly movably supported at a portion thereof between the disk abutment assembly and the operating member by a shaft, wherein when a transferred disk abuts against the disk abutment assembly to press the disk abutment assembly, the disk centering member is angularly moved about the shaft, and then prevented from being angularly moved by a stopper, centering the disk, and a gear switching mechanism operable by being pressed by the operating member. The disk abutment assembly has a first disk abutment for angularly moving the disk centering member by a predetermined angular interval when a first disk is transferred, and a second disk abutment for angularly moving the disk centering member by an angular interval, which is substantially the same as the angular interval of the first disk abutment, when a second disk having a diameter different from the diameter of the first disk is transferred.
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