Automatic feed system for sampling apparatus

An automatic feed system for use with blood sampling apparatus of the type comprising a first conveyor for conveying a series of stoppered tubes to a sampling station and for imparting a motion to the tubes to mix the contents of the tubes as they are conveyed to the sampling station, and a needle for penetrating each tube when it arrives at the sampling station to withdraw a specimen sample therefrom. The feed system comprises a second conveyor for conveying a series of such tubes one after another to a pick-up station, and a tube-transfer device for transferring a tube at the pick-up station from the second conveyor to the first conveyor of the sampling apparatus for conveyance to the sampling station.