A machine tool includes a spindle device; a shutter which is disposed between a tool magazine disposed over a machining chamber and the machining chamber, and is capable of opening and closing; a tool exchange device; and a tool breakage detecting device to detect whether a tool indexed to a tool detecting position of the tool magazine has breakage or not, and performs a return step of returning a first tool to the tool magazine with use of the tool exchange device; an attachment step of attaching a second tool to the spindle device; and a breakage detecting step of rotatively moving the first tool returned to the tool magazine to the tool detecting position and detecting breakage of the first tool with use of the tool breakage detecting device, after the shutter is closed. This constitution can prevent erroneous detection and improve the operational efficiency of the machine tool.

The chain magazine for holding tools (5) for machine tools includes a continuous chain (1) which has chain links (2) each with at least one tool holder (2a, 2b) and with which at least one sprocket (6, 7) meshes and a guide device (9-12) which has a guide element (12) that can be moved back and forth between a first and a second position, by means of which a tool holder (2a, 2b) of a chain link (2) can be turned in and turned out.

12

In order to be suitable for space-saving of a multi-functional processing machine in which a tool main spindle device is disposed at a center of an opposed biaxial lathe, there is provided an automatic tool exchanger provided in the multi-functional processing machine, the automatic tool exchanger including: a tool magazine that is disposed in a machine body front surface upper portion of the multi-functional processing machine and is configured to house multiple tools for exchange with respect to the tool main spindle device; a shift device configured to move the tool between the tool magazine and a tool exchanging position with respect to the tool main spindle device; and a tool changer configured to exchange the tool between the shift device and the tool main spindle device.

A tool magazine (25) includes a revolving holder (33) which rotates about a rotation axis (A-A). The revolving holder (33) includes a set of first seats (47) for receiving tools (U) and a set of second seats (49) for receiving tools. The revolving holder (33) further includes an inner edge (43.2), facing an inner volume (46) defined by the revolving holder (33), and an outer edge (43.1). The outer edge and the inner edge extend around the rotation axis. The first seats (47) are arranged along the outer edge (43.1) and face the opposite direction to the inner volume (46). The second seats (49) are arranged along the inner edge (43.2) and face the inner volume (46).