Shuttering mechanism for a cassette with a shutter moving arm

Claim 1

A shutter opening mechanism for a disk cassette record-playback apparatus, said disk cassette being adapted for reciprocal insertion into a cassette holder and having a reciprocally mounted shutter mounted thereon for reciprocation along the direction of insertion of the cassette for covering and exposing a window in the cassette through which a recording medium of the cassette is accessed, and first means on said cassette for positively locking said shutter in a closed position in which said window is covered, said shutter opening mechanism comprising second means on said cassette holder intercepting and releasing said locking means during insertion of the cassette into the cassette holder, and an elongate control arm pivotally mounted on said cassette holder near the center of its length and extending along said direction of insertion, a first end of said control arm having a tongue for positively engaging said shutter immediately before said second means releases said locking means to thereby reciprocate said shutter to expose the window upon further insertion movement of the cassette and to cover said window upon removal of said cassette from said cassette holder, the other end of said control arm having means for contacting the outer periphery of said cassette shutter for pivoting said tongue into position engaging an aperture in said cassette during insertion of said cassette and for allowing said tongue to be withdrawn upon removal of said cassette.