Anti-backlash gear and transmission mechanism using the same

A transmission mechanism, comprising:

• a first gear, comprising:
• an outer ring defining a plurality of first fixing holes in its periphery;
• an inner ring concentric with the outer ring, and defining a plurality of second fixing holes in its periphery, the second fixing holes corresponding to the first fixing holes, wherein each first fixing hole, the corresponding one of the second fixing holes, and the center of the rings are in alignment, and defining an axis of radial movement between the pair of the first and second fixing holes;
• a plurality of first gear teeth;
• and
• a plurality of elastic member sleeved on the respective gear teeth;
• and
• a second gear with a plurality of second gear teeth meshed with the first gear;
• wherein each first gear tooth extends through a pair of corresponding first and second fixing holes, and being movable along the axis defined by the pair of the first and second fixing holes, each elastic member is configured to deform and rebound during the movement of the corresponding first gear tooth so as to absorb the shock generated by the first and second gears.

A gear, comprising:

• a main body defining a hole and a plurality of moving tracks radiating from the hole;
• a plurality of teeth attached to the main body, each tooth being connected to a corresponding one of the moving tracks and movable along the corresponding moving tracks;
• a plurality of resilient members received in the main body and deformable when being compressed;
• wherein when a tooth of the plurality of teeth meshes with another element, the tooth moves toward the hole of the main body along the corresponding moving track and compresses the resilient member, and when the tooth is released from the another element, the tooth moves far away the hole of the main body along the corresponding moving track by a resilient force provided by the compressed resilient member.