Patent ID: 8603249

Claim:
A lift pin driving device, comprising: a support unit configured to receive a substrate thereon; a pin plate positioned below the support unit; a plurality of lift pins extending upwards from the pin plate so as to pass through a corresponding plurality of holes in the support unit; a drive unit configured to move the pin plate and the plurality of lift pins fixed thereto upwards and downwards so as to move a substrate positioned thereon, the drive unit comprising; a single drive motor; and a plurality of pulleys operably coupled to the single drive motor by a power transmission unit, wherein one of the plurality of pulleys is coupled to the single drive motor and is independently coupled to neighboring pulleys by respective timing belts of the power transmission unit such that rotation of the single drive motor rotates all of the plurality of pulleys in the same direction; and a tensioner, comprising a tension roller that maintains rolling contact with the power transmission unit so as to control a tension thereof.