Patent ID: 8585333

Claim:
A machine spindle, for machining a work piece via a tool arranged on the machine spindle, said machine spindle comprising a housing; a drive shaft having a longitudinal axis, said drive shaft being rotated by a motor of the spindle around its longitudinal axis and being pivot-mounted in the housing; a hollow working shaft having a longitudinal axis, said hollow working shaft being pivot-mounted in the housing, wherein the longitudinal axis of the hollow working shaft and the longitudinal axis of the drive shaft are aligned coaxially to each other; a clamping rod for fastening the tool to the machine spindle, the clamping rod being mounted within the hollow working shaft such that the clamping rod is slideable in a direction axially to the longitudinal axis of the hollow working shaft; a coupling device for selectively coupling, in a first coupling position, the drive shaft with the clamping rod for the purpose of tool change, or coupling, in a second coupling position, the drive shaft with the tool for machining the work piece; wherein in the first coupling position, the hollow working shaft is connected with the housing so as to be non-rotatable relative to the housing, and is disconnected from the drive shaft such that the drive shaft is rotatable relative to the hollow working shaft, and the clamping rod is coupled with the drive shaft so that the clamping rod can be slided in the direction axially to the longitudinal axis of the hollow working shaft by the drive shaft; wherein in the second coupling position, the hollow working shaft is connected with the drive shaft such that the hollow working shaft does not rotate relative to the drive shaft, and the hollow-working shaft is disconnected from the housing so that the working shaft and the drive shaft can rotate together relative to the housing; and wherein the connections and disconnections in the first coupling position and the second coupling position can be carried out in any rotation position of the drive shaft about the longitudinal axis of the drive shaft.