Anterograde display mechanism for timepiece

An anterograde display mechanism for a timepiece comprising a display having a graduation having a plurality of guide-marks distributed on a circumference of the display, the graduation being configured such that the angular distance separating at least two successive guide-marks corresponding to a second angle (β) greater than a first angle (α) separating two of the other successive guide-marks, the anterograde display mechanism being configured to drive a display organ in the angular movements thereof by successive short jumps of an angle (α) between two guide-marks separated by the first angle (α) and by a long jump of an angle (β) between two graduation guide-marks separated by the second angle (β), wherein the anterograde display mechanism comprises:

• a first wheel, referred to as drive wheel, capable of being driven by a horological movement;
• a second wheel coaxial with the first wheel and linked to the first wheel by an elastic organ;
• a first intermediate wheel driven directly by the first wheel and which directly drives a third wheel, referred to as display wheel, cooperating with said display organ;
• said third wheel including a smooth angular sector where at least two teeth are truncated;
• a fourth wheel coaxial and rigidly connected in rotation with the third wheel, said fourth wheel meshing said second wheel via a second intermediate wheel;
• the anterograde display mechanism being configured so that the rotational speed of the second wheel is less than the rotational speed of the first wheel when the display organ is driven in the angular movements thereof by successive short jumps of an angle (α) between two guide-marks separated by the first angle (α), so as to progressively wind the elastic organ during these successive short jumps, and so that when the teeth of the intermediate wheel encounter the smooth angular sector of the third wheel, the elastic organ is let down inducing the instantaneous passage of the smooth angular sector and inducing the angular movement by a long jump of an angle (β) of said display organ.