Patent ID: 7428738

Claim:
A disk drive comprising: a casing defining a longitudinal axis; and a gear transmission system including a first gear disposed within said casing, a gear transmission unit including a second gear and a third gear, a driven plate disposed within said casing to extend in a transverse direction relative to said longitudinal axis of said casing, and movable along said transverse direction to a left and a right side of said casing, said driven plate having a first serrated portion meshed with said first gear, and a second serrated portion disposed adjacent to and facing said third gear, said driven plate further having first and second guiding slots, and a lifting frame disposed within said casing, and having first and second couplers slidably and respectively engaging with said first and second slots in said driven plate, and a resilient pushing arm extending in a direction transverse to said longitudinal axis and forming a slit therebetween; wherein, the rotation of said third gear results in movement of said driven plate between said right and left sides of said casing, wherein, said lifting frame is operably associated with said driven plate in such a manner that the movement of said driven plate between said right and left sides of said casing results in the movement of said lifting frame between a lower position and an upper position alternately, wherein said resilient pushing arm abuts against said driven plate opposite to said second serrated portion when said lifting frame is in said upper position for absorbing the force applied by said third gear onto said second serrated portion.