Tool changing device, machine tool and method for changing a tool

A machine tool, comprising:

• a frame,
• at least one workpiece holder for receiving a workpiece,
• at least one tool holder for receiving a tool, and
• a tool changing device, comprising:
• a tool magazine comprising:
• a magazine axis, wherein the tool magazine is rotatable about the magazine axis by a rotary drive, and
• a plurality of holding locations for tools that have a support shaft and a receiving groove,
• wherein at least some of the holding locations are arranged offset relative to one another along the magazine axis,
• wherein at least some of the holding locations are arranged offset relative to one another about the magazine axis, and
• wherein the holding locations are configured to hold the tools at the receiving groove,
• a transfer device comprising a transfer carriage,
• wherein the transfer device is movable between a first transfer position in relation to the tool magazine and a second transfer position in relation to a tool holder of the machine tool to transfer tools between the tool magazine and the tool holder, and
• a linear drive for the tool magazine that is configured to move the tool magazine along the magazine axis relative to the transfer device to provide, together with the rotary drive, a selected holding location in the first transfer position,
• wherein the tool holder is movable relative to the frame to the second transfer position for a tool change.

A method of changing a tool at a machine tool, comprising the following steps:

• providing a tool magazine having a magazine axis that is rotatable by a rotary drive about the magazine axis and movable by a linear drive along the magazine axis,
• wherein the tool magazine has a plurality of holding locations for tools that have a support shaft and a receiving groove,
• wherein at least some of the holding locations are arranged offset relative to one another along the magazine axis,
• wherein at least some of the holding locations are arranged offset relative to one another about the magazine axis, and
• wherein the holding locations are configured to hold the tools at the receiving groove,
• providing a transfer device comprising a transfer carriage,
• wherein the transfer device is movable between a first transfer position in relation to the tool magazine and a second transfer position to transfer tools between the tool magazine and a tool holder of the machine tool,
• moving the tool magazine by the linear drive and the rotary drive to provide a selected holding location for a tool in the first transfer position, and
• transferring a tool between the first transfer position and the second transfer position,
• wherein in the first transfer position, the tool is directly transferred between the tool magazine and the transfer device, and
• wherein in the second transfer position, the tool is transferred between the transfer device and the tool holder.