Device for automatic winding of straps

The device (1) has a guide unit for guiding a strap (2) between an input opening (30) and a winding shaft (4). The shaft is arranged to allow temporary fixing of an end of the strap to roll up and coupled with a motor by a transmission that is arranged for rotating the shaft in center direction and generating winding of the strap by itself when the motor is rotated in the direction. The shaft is rotated in opposite center direction and axial displacement of the shaft is generated to eject the rolled up strap when the motor rotates in the opposite direction.