Timepiece mechanism

A timepiece mechanism, wherein the mechanism comprises:

• a first lever, rotatable about a lever axis, the angular position of the first lever representing a first value a, wherein a zero value of the first value corresponds to a reference direction,
• a sliding block mounted to move in translation on the first lever in a direction substantially perpendicular to the axis of the first lever and comprising a guide-mark element whose trajectory in translation relative to the first lever is secant to the lever axis, the radial position of the guide-mark element with respect to the lever axis representing a second value b,
• an output device formed of a deformable parallelogram in a plane perpendicular to the lever axis, the parallelogram including a first side that is stationary relative to the lever axis and perpendicular to the reference direction, a second side opposite to the first side and linked in translation to the guide-mark element in the direction perpendicular to the reference direction,
• and wherein the angular position of the third side and the fourth side of the parallelogram, which are adjacent to the first side, satisfies the equation:
• r·sin(a)=R·sin(b)
• where r is the radial distance of the guide-mark element from the lever axis and R is the length of the third side and the fourth side of the parallelogram.