Abstract: A tool-changing device for a machine tool comprises a tool selector which is movable over a tool storage matrix to select tools from fixed storage locations and transfer them to an exchange position in readiness for mounting on a work head of the machine tool. The work head is movable inter alia along a Z machining axis, and the exchange position is disposed on a pick-up axis parallel to the Z axis at a level which varies in accordance with the position of the work head.

Abstract: A machine tool comprises a work head in which tools are mounted in use and which is movable along a main beam in a Y machining direction. A tool selected from a tool storage matrix is held at an exchange position in readiness for exchange with a tool mounted on the work head. A carriage is movable along a subsidiary beam in a direction parallel to the Y machining direction and carries a pair of tool grippers. During a tool change, one of the grippers takes the tool from the exchange position and holds the latter while the carriage moves to the work head where it latches onto the latter by means of a latch device. The other gripper then removes the tool from the work head, whereupon said one gripper inserts the replacement tool in the work head. The carriage then unlatches from the work head and moves away therefrom, so that said other gripper can return the removed tool to the exchange position.