Patent ID: 7806637

Claim:
A machine tool of the type comprising: a casing; a tool-holder spindle extending along an axis; a drive mechanism for driving the tool-holder spindle, the drive mechanism comprising: a first drive member for driving the spindle in rotation about its axis relative to the casing; a second drive member for driving the spindle in translation along its axis relative to the casing, the second drive member being screwed onto a threaded portion of the spindle so that the spindle advances or returns along the axis as a function of a relative rate of rotation between the first drive member and the second drive member; a drive clutch member connected to the second drive member in order to drive the second drive member in rotation, the second drive member being movable relative to the casing along the axis between an advanced position and a returned position, the second drive member being, in the advanced position, connected in rotation to the drive clutch member, and the second drive member being, in the returned position, not connected in rotation to the drive clutch member.