DISC

Generally speaking, in horology the disc is a solid cylinder of small thickness that fulfills various functions depending on the mechanism. It frequently serves as a display support: Date disc, Day disc, Month disc, or Moon phase disc, a portion of which appears in an Aperture / Window of the Dial to indicate information. It can also play a mechanical role, such as a Cam driving or controlling a lever, or as a moving element of a Train (wheel train). Display discs are generally printed, engraved or decorated, and their advancement is ensured by a peripheral toothing driven by the Motion work or by a jumping Finger, often associated with a Neck chain (sautoir) ensuring a clean positioning. The lightness of the disc limits energy consumption and facilitates instantaneous changes. Its flatness, its Poising and the quality of its toothing determine the reliability of the Display. Discreet, the disc is a versatile component found in a wide variety of complications and constructions.