Abstract: A floppy disc recording and/or reproducing apparatus comprises a loading mechanism which has a support member which is fixed to the frame and has cam levers pivotally supported thereon, where each of the cam levers have a second cam part, a cartridge holder which has a first cam part and is arranged movable in upward and downward directions of the apparatus under guidance of the support member, and a push-eject member which has third and fourth cam parts and an ejecting push-button. The push-eject member is movable in frontward and rearward directions of the apparatus under guidance of the frame or the support member. A sequence of operations are carried out when a cartridge which accommodates the floppy disc is placed onto the cartridge holder so as to load the cartridge with respect to a driving shaft.

Abstract: A recording disc cartridge comprising a disc case composed of a top case half and a bottom case half and a recording disc rotatably enclosed in the disc case, each of the top half and the bottom half being provided with at least one pair of connecting bosses in such a manner that the connecting bosses of one half are engageable with the corresponding connecting bosses of the other half and that the connecting bosses are disposed symmetrically relative to a phantom line passing the center of a head insertion hole and the center of a drive shaft insertion hole.

Abstract: A push-button type tuner apparatus comprises a slide cam member having a plurality of V-shaped cam parts formed therein and supported slidably in the transverse direction on a frame structure, and a plurality of manually operated structure supported slidably backwards and forwards on the frame structure. Each manually operated structure is provided with a memory member for restricting the position of the slide cam member when engaged with an associated V-shaped cam part thereof, a clamp member for supporting the memory member in a clampable manner, and a clamp cam member supported to slide with respect to the clamp member and for causing the clamp member to undergo clamping operation responsive to slide motion of the clamp cam member.

Abstract: A UHF Tuner device having a first rotating member rotating unitarily with a coarse tuning rotating shaft and adapted to be indexed and held in a position to which it has been thus rotated; a second rotating member rotated unitarily with a fine tuning rotating shaft; and a third rotating member rotated by the rotation of the second rotating member thereby to vary the capacitance of a variable capacitor of a tuner device proper, the second and third rotating member rotating unitarily with the first rotating member at the time of channel-selection coarse tuning when the coarse turning rotating shaft is rotated, and the third rotating member being rotated in accordance with the rotation of the second rotating member at the time of fine tuning when the fine tuning rotating shaft is rotated.