Abstract: A method and apparatus for drying a wafer at a drying station includes a wafer holder which grips the wafer on its edge so that there is no contact with a face of the wafer. This eliminates contact areas which could cause stains on the face. A carriage mechanism brings a wet wafer into the drying station at one level and takes the dry wafer out of the drying station at a different level to prevent any contact between the dry wafer and residual moisture at the incoming level.

Abstract: A drive mechanism for a wafer processing machine of the kind which holds a silicon wafer on a vacuum chuck and rotates the wafer for processing operations on the wafer periphery or upper surface incorporates a low-speed motor, a high-speed motor and an overrunning clutch. The low-speed motor is connected to a drive shaft for the chuck through the overrunning clutch and rotates the chuck and wafer at a relatively low and precisely-controlled speed while the edge of the wafer is contoured by a grinding wheel or while the upper surface is mechanically cleaned by a brush engaged with the upper surface of the wafer. The high-speed motor is directly connected to the drive shaft and, when energized for a rinsing and drying operation, rotates the chuck and wafer in the same direction of rotation as the low-speed motor but at high speed while the wafer is being rinsed and dried after the grinding or cleaning operation.

Abstract: A conveyor system for conveying a relatively fragile work piece, such as a silicon wafer, to and from a work station where one or more processing operations are performed on the work piece comprises two parallel conveyor belts. Each conveyor belt is mounted on a separate carriage, and the carriages are moveable laterally toward and away from each other during different periods of operation of the conveyor system and also to enable different size work pieces to be carried by the conveyor belts. The conveyor belts are driven by a drive belt system which comprises a fixed length, closed loop drive belt and a pulley arrangement operatively associated with the drive belt for accommodating lateral motion of the carriages while permitting drive of the conveyor belts at all lateral positions of the carriages and without any change in the length of the drive belt. The conveyor system also provides positive handling of the work piece during all conveying and processing operations to minimize breakage of the work piece.