Work head changer for rotary vessel processing system

A rotary vessel processing system including a rotatable body for conveying vessels at a given interval, a plurality of work heads circumferentially spaced apart at an equal interval on the rotatable body for applying a processing operation to each of vessels which are conveyed by the rotatable body, and a connection provided between the rotatable body and each work head to permit an engagement and disengagement therebetween for detachably mounting each work head on the rotatable body;

• and
• a work head changer including a controller for controlling the rotation of the rotatable body so that each work head is successively and intermittently stopped at a predetermined work head replacement position, and a work head delivery mechanism for removing a work head which comes to a stop at the work head replacement position from the connection and for attaching a work head of another variety to the connection at an emptied location where the work head has been removed.