Control mechanism (1) for loading an energy accumulator (20) for a timepiece (100) or a timepiece movement (10) via an intermediate winding mechanism (25), said mechanism (1) comprising a winding button (2) arranged to drive, at least in translation, a winding stem (3) which can occupy at least an initial longitudinal position (T0) for said energy loading.A portion of the length of said stem (3) is ringed or threaded, to pivot and/or drive in translation a winding driving means (4), when said stem is moved in translation as a result of pressure or traction by the user, in a limited travel between said initial position (T0) and an unstable maximum pushed-in or respectively pulled-out position (TL) of said stem (3), which is returned to said initial position (T0) by elastic return means (5),