Patent ID: 8899123

Claim:
A gear transmission device, comprising: a driven gear; a driving gear in the form of a toothed wheel having a hole in a middle thereof, the driving gear comprising a pair of first positioning keys and a pair of first securing posts respectively projecting from the pair of first positioning keys; a shaft coupling received in the hole, the shaft coupling comprising a second positioning key abutting the inner surface of the driving gear and a pair of second securing posts projecting from two sides of the second positioning key; a resilient mechanism coiled around a corresponding first securing post and a corresponding second securing post to urge urged between the driving gear and the shaft coupling; and a driving assembly operatively coupled to the shaft coupling to drive the driving gear; wherein when the shaft coupling drives the driving gear axially to engage with the driven gear and the driving gear contacts the driven gear, a resisting force generated between the driving gear and the driven gear causes the driving gear to rotate a tiny an angle relative to the shaft coupling and further urge the resilient mechanism whereupon the driving gear meshes with the driven gear.