Disk playback device with changer allowing playback of one disk while another can be exchanged

A disk playback device comprising.

• a stacker provided within a main body of the device;
• a plurality of trays horizontally disposed one above another within the stacker and each of the plurality of trays adapted to carry a disk thereon;
• an optical head base provided in a bottom portion of the main body of the device for playing back the disk;
• a tray opening-closing mechanism engageable with a desired tray of the plurality of trays for moving the desired tray between the stacker and a disk discharge position for opening or closing;
• a transport mechanism for approximately horizontally moving the desired tray between the stacker and a loading completed position above the head base;
• a tray holder provided at the loading completed position, upwardly or downwardly movable, for holding the desired tray;
• a guide bar held to each of the plurality of trays by a spring member and slidable in opening and closing directions, the tray opening-closing mechanism being engageable with the guide bar, the transport mechanism having a gear train mounted on the tray holder and meshing with the desired tray for releasing the desired tray from the guide bar when loading the desired tray and for slideably moving the desired tray toward the tray holder;
• a gear train including a contact wall movable into contact with the tray holder to regulate rotation of the gear train when the desired tray is completely unloaded;
• biasing means for actuating the tray opening-closing mechanism and biasing the guide bar toward a direction of loading when unloading is started;
• and
• gear train control means for rotating the gear train further in a direction of unloading after the contact wall comes into striking contact with the tray holder on completion of unloading.