Unit that comprises a winding ratchet that is attached to a barrel arbor and barrel arbor for this unit

Unit that is formed by a winding ratchet and a barrel arbor, characterized by the fact that one of the ends of the barrel arbor comprises a driving formation that is non-circular in shape as well as a groove that is adjacent to this driving formation that defines a small-section portion of the barrel arbor whose shape and dimensions are such that they extend into the section of the driving formation, whereby a shoulder of the barrel arbor limits the height of said groove from the side facing said driving formation;

• by the fact that the ratchet comprises a central opening with a shape and dimension corresponding to the driving formation of the barrel arbor;
• by the fact that this ratchet comprises at least one off-centered tapping relative to the ratchet by a determined distance;
• by the fact that it comprises an attachment washer that has a central passage with a shape and dimension that correspond to the driving formation of the barrel arbor and is engaged with the latter in assembled position, as well as at least one off-centered piercing relative to said washer by a predetermined distance that is equal to the off-centering of the tapping of the ratchet;
• by the fact that it also comprises at least one screw that makes it possible to screw the attachment washer on the ratchet;
• and by the fact that the angular position of the piercings of the ratchet, relative to an axis of symmetry (x-x) of its central opening, is different from an angle (α) of the angular position that the tappings of the attachment washer exhibit relative to the corresponding axis of symmetry (y-y) of the central passage of this attachment washer.