FASTENER DRIVING APPARATUS

A fastener-driving apparatus is provided comprising a mechanical storage means with a tensioning device driven via a rotatable shaft, where release of the stored mechanical energy drives a driving ram, a drive arrangement with an electric motor to introduce mechanical energy into the energy storage means by driving the shafts in a tensioning direction, and a locking coupling arranged between the motor and the tensioning device and having an input shaft and an output shaft, where the tensioning device is kept self-locking by the locking coupling in at least one pretensioned position when the motor is shut off, and where the locking coupling has at least one locking element that can be wedged against an active surface, where the locking element is releasable from a wedged position by means of a rotation of the input shaft against the tensioning direction by a specific amount of travel (H).