| 摘要 |
In a disc apparatus, a tray gear has a boss protruding from one predetermined place in an inner circumference edge part thereof. During assembly of a tray into the apparatus cabinet, when the boss is located within a predetermined range of rotation of the tray gear, the boss meshes with a groove-forming rib provided on the tray and is thereby centered so that the tray gear and the rack mesh with each other always at the same teeth thereof.
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