Patent ID: 8245740

Claim:
A device for positioning a component thereof along x- and y-axes comprising: a first motor; a lead screw coupled to said first motor and extending along a first axis of said device; a second motor; a keyed shaft coupled to said second motor and extending along said first axis of said device; a carriage portion threadably engaged with said lead screw for movement along a length thereof, said carriage portion further slidingly engaged with said keyed shaft for movement along a length thereof; a shaft portion fixedly attached to said carriage portion and defining a second axis of said device, said second axis being perpendicular to said first axis; a positionable portion to be positioned along said first and second axes of said device, said positionable portion being slidingly attached to said shaft portion, wherein said positionable portion is operably coupled to said keyed shaft such that rotation of said keyed shaft causes movement of said positionable portion along a length of said shaft portion; a first sensor assembly coupled to said lead screw for determining the extent of rotation thereof; and a second sensor assembly coupled to said keyed shaft for determining the extent of rotation thereof.