Dustproof door mechanism

Claim 1

A dustproof door mechanism, comprising: a dustproof door supported on a shaft located near a cassette insertion aperture of a tape player for pivotal movement about an axis between closed and open positions respectively obstructing and permitting insertion of a cassette through said aperture, said door having thereon a surface facing in a first direction and said door moving away from said closed position in a second direction substantially opposite said first direction; a first spring which yieldably urges said door toward said closed position; a loading gear selectively rotatably in opposite rotation directions to drive a cassette loading mechanism in the tape player and having a door opening am integrally formed thereon; a door opening link supported for pivotal movement about said axis between said first and second positions and having an engaging portion engageable with said surface of said door, said door being movable from its closed to its open position independently of said opening link when said opening link is in its first position, and wherein as said opening link moves from its first position to its second position engagement of said engagement portion with said surface on said door effects movement of said door to its open position against the urging of said spring; a second spring engaging said door opening link to yieldably urge said door opening link toward its first position; and a door drive link supported for pivotal movement between first and second positions, having cam follower means thereon engaging said door opening cam for effecting movement of said door drive link from its first to its second position in response to rotation of said cam, and having a portion pivotally coupled to said door opening link, said drive link moving said opening link from its first position to its second position as said drive link is moved from its first position to its second position by said cam.