Coupling device

A tool turret, comprising:

• a drive unit having a drive shaft with an external gearing;
• a rotatable tool holder disk;
• a tool holder receivable by and rotatable with the tool holder disk and having an output unit and capable of retaining a machining tool, the output unit having an output shaft with an internal gearing, the internal gearing engaging the external gearing when the external gearing is in a first clutch position, and the external gearing and the internal gearing forming a coupling that detachably engages and forms a drive connection between the drive unit and the output unit such that the drive unit rotationally drives the output shaft;
• and
• an aligner ensuring a collision-free alignment between the external gearing and the internal gearing prior to engagement of the external gearing and the internal gearing, the aligner including on one side thereof a control that interacts with the drive shaft, and the aligner including, on a side thereof that is opposite the one side, an engager that is moveable so as to engage the tool holder, wherein movement of the control moves the engager.