Impact screwing/unscrewing device with idling control

An impact screwing/unscrewing device comprising:

• an electric motor comprising a rotor having an axis of rotation and a drive shaft;
• a flywheel coaxial to the drive shaft of said rotor;
• a controller, wherein the controller is configured to transmit a command instruction to said motor;
• and
• an impact mechanism comprising:
• at least one anvil mounted such that the at least one anvil can rotate about the axis of rotation of said rotor;
• at least one hammer which is rotatable by said motor about said axis of rotation, said at least one hammer being movable between at least:
• a non-engaged position in which the at least one hammer is not capable of colliding with said at least one anvil when the at least one hammer is rotated by said motor, and
• an engaged position in which the at least one hammer is capable of colliding with said at least one anvil when the at least one hammer is rotated by said motor,
• wherein a variation of said command instruction supplied to said motor by said controller triggers passage of said at least one hammer from one of the non-engaged position and the engaged position to the other;
• and
• wherein:
• said at least one hammer is attached to said flywheel such that said at least one hammer can move between the non-engaged and engaged positions thereof,
• said flywheel is arranged to rotate relative to said drive shaft over an angular range bounded by at least one end position in which said flywheel and said drive shaft are rotatably linked and said at least one hammer is in the non-engaged position thereof, and
• said device comprises at least one actuating element actable on said at least one hammer in order to place the at least one hammer:
• in the non-engaged position thereof when said drive shaft is in said at least one end position;
• and
• in the engaged position thereof when said drive shaft is in a predetermined position in said angular range.