Device for winding the suspension cord of a blind

A device for winding at least one suspension cord of a blind comprising a winding drum (1), one end of said suspension cord (11) attached to said winding drum, an auxiliary drum means on said winding drum for ensuring that the cord is wound in even turns without overlapping, said auxiliary drum means having a smooth drum portion (8;8') having a diameter which is greater than the diameter of the winding drum (1) and located at a distance from the cord end, a shoulder means (9';9") on one end of said auxiliary drum means for moving successive cord windings axially away from the shoulder means and onto the auxiliary drum means as the cord windings are formed, and guide means (10) for guiding the cord to be wound onto the shoulder means so that successive cord windings are formed on the auxiliary drum means and are pushed off the opposite end of the auxiliary drum means onto the winding drum under the effect of the shoulder means on the cord.