RUNNING TIME EQUATION MECHANISM CONTROLLED BY A DIFFERENTIAL DEVICE

• Main Authors: Zaugg, Alain, Dauby, Sylvain
• Format: Patent
• Language: English; French; German
• Published: 30.03.2022
• Subjects: HOROLOGY; MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL; MECHANICALLY-DRIVEN CLOCKS OR WATCHES; PHYSICS; TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS

The present invention relates to a running time equation mechanism comprising a pointer device, and the pointer device is used to indicate the apparent or actual solar time with the help of a civil time hour pointer (46) and an actual solar time minute hand (50) concentric with the civil time hour pointer (46). The pointer device does not have a civil time minute hand, and the civil time hour pointer (46) is rotated and driven by a clock movement and further drives the actual solar time minute hand (50). The running time equation mechanism 44 also comprises a time equation cam (54) having a contour determined by the difference value between the average solar time or the civil time and the apparent solar time or the actual solar time for each day in a year, the time equation cam (54) is rotated and driven by the clock movement with a rate of one circle every year, and the position of the actual solar time minute hand (50) is determined by the position of the time equation cam (54).