A tape cassette includes reel hubs rotatably received in the housing of the cassette, each reel hub being formed with a recess. The recess includes an opening at its lower end and reel pawls therein are adapted to engage with pawls of a reel drive on a reel base. The recess further includes a cylindrical-shaped portion disposed below the reel pawls and a conical-shaped portion disposed below the cylindrical-shaped portion, one of which portions is caused to engage with an engaging surface of the reel base of the reel drive on the reel base, thus enabling the centers of the reel hub and the reel base to correspond with each other.
An apparatus for driving a reel in a tape cartridge for a magnetic instrument with a reel lock having a non-rotary forced member disposed at a center of the reel in the tape cartridge comprising a protruding reel drive to engage the reel to drive rotatively drive the reel and a non-rotary unlocking element disposed at a central axis of the reel drive to force the forced member so as to displace the reel lock whereby the reel is unlocked.
A magnetic tape cassette includes a cassette casing composed of upper and lower cassette shells joined to each other, a pair of reel hubs rotatably disposed in the cassette casing and supported by the cassette shells, and a magnetic tape wound around the reel hubs and housed in the cassette casing. The cassette shells have a pair of sets of aligned holes defined therein for receiving hub drive shafts, respectively, and a pair of sets of circular recesses defined in inner surfaces of the cassette shells in coaxial surrounding relation to the holes. The reel hubs have axial holes for receiving the hub drive shafts and open ends loosely fitted in the recesses.
A magnetic-tape-cassette apparatus includes a tape deck having winding mandrels (5) which are rotatably supported on bearing spindles (3), these winding mandrels being adapted to engage winding-mandrel holes in the magnetic-tape cassette (11), and each have at least one coupling fin (10a, 10b, 10c) arranged on its circumference. To facilitate lowering of the cassette (11) onto the winding mandrels (5) and to preclude any problems which could then arise, the winding mandrels (5) are mounted on the bearing spindles (3) so as to be axially movable in a range of axial movement and are each pre-loaded towards a preferred axial position by at least one spring (9).
A tape cassette which includes a cassette shell housing in which reels wound with a magnetic tape are incorporated, a depressing member for depressing an upper surface of each reel, and a reel displacing amount reducing member having its one end engaged with the depressing member, and its other end, exposed on an upper surface of the cassette shell housing through a through-hole formed in the cassette shell housing. The amount of displacement of the reels is reduced by restricting displacement of the exposed portion of the reel displacing amount reducing member.
