Adjustment mechanism for timepiece display mechanism with rollers

An adjustment mechanism for a timepiece display mechanism comprising at least a first input wheel arranged to drive, directly or indirectly, a first control wheel for controlling the position of a first display member comprised in said display mechanism, the adjustment mechanism comprising:

• a differential gear train mechanism which includes a drive wheel set retained by a display jumper and is arranged to be pivoted by said first input wheel, and arranged to drive at least one planetary wheel meshing with said first control wheel and mounted pivotally and off-centre with respect to a planetary wheel holder friction-mounted, either inside a cavity of a frame of said adjustment mechanism, or by internal friction on a shoulder of said frame, said differential gear train mechanism being arranged to multiply by a particular factor the rotation between one of the inputs and the output of said differential mechanism when the other input is stationary, and
• wherein said planetary wheel holder includes manipulating means arranged to allow a watch technician to release said planetary wheel and change the angular position of said planetary wheel, which determines the position of said first control wheel for the correct indexing thereof with respect to at least one other display member of said display mechanism.