Patent ID: 7611182

Claim:
A wafer transfer apparatus comprising: a robot arm unit; a blade having two end portions, one end portion operably connected to the robot arm unit, the second end portion having a fix finger at a peripheral edge thereof, and the blade configured to support a wafer; a clamping arm attached to the robot arm unit, the clamping arm including: a movable finger configured to engage and disengage a peripheral edge of a wafer, a moving pusher attached to the movable finger at a first end and configured to guide the movable finger and the wafer on the blade towards the fix finger; and a case including at least one stopper configured to regulate the movement of the moving pusher, wherein the at least one stopper is a screw, and a spring for controlling a speed of the moving pusher and configured to absorb a shock produced when the moving pusher contacts the wafer.