Patent ID: 7685897

Claim:
A differential gear transmission type work units positioning system comprising: a linking mechanism coupled to a number of work units for controlling the positioning of said work units and moving said work units at an equal pitch, and only a single driving mechanism for driving said linking mechanism to control both the pitch among the work units and the movement of the work units at the equal pitch, said linking mechanism comprising: a first coupling block affixed to one of said work units with screws; a simple gear pivotally mounted in said first coupling block by means of a wheel axle and two bearings; a second coupling block affixed to another of said work units with screws; a compound gear formed of a top gear and a bottom gear, said top gear and said bottom gear being axially fixedly connected together and pivotally mounted in said second coupling block by means of a wheel axle and two bearings; a drive rack fixedly connected to the work unit where said second coupling block is installed and meshed with said simple gear; a driven rack fixedly connected to another of said work units and meshed with the top gear of said compound gear; a fixed rack mounted on a bracket; and a rail arranged in parallel to said fixed rack for guiding linear movement of said compound gear, said drive rack and said driven along the extending direction of said rail.