Patent ID: 7464807

Claim:
A transfer device of a handler for testing semiconductor devices, the transfer device comprising: a base part; a plurality of picker heads movably on the base part; a cam plate movably coupled to the base part and having a plurality of inclined cam grooves formed therein; connection bars each having first side thereof secured to one of the picker head and a second side thereof movably connected to one of the cam grooves; and a driving unit that reciprocates the cam plate so as to move the picker heads between a first position and a second position, wherein the driving unit comprises: a motor provided with the base part; and a power transmission part that converts power from the motor to a reciprocal motion of the cam plate, wherein the power transmission part comprises: a driving pulley engaged with a drive shaft that receives power from the motor; first pulleys rotatably mounted on a power transmission shaft coupled to the base part, and engaged with the driving pulley so as to rotate together with the driving pulley; second pulleys rotatably coupled to the base part at a predetermined distance from the first pulleys; power transmission belts that connect the first pulleys with the second pulleys; and connection parts that connect the power transmission belts with the cam plate.