SPLIT-SECONDS DEVICE WITH EPICYCLOIDAL TRAIN FOR A TIMEPIECE

摘要

The present invention relates to an epicyclic gear retractor device (10) for a timepiece, especially for a chronograph watch, the device comprising a split-second gear (2.1) carrying a split-second needle (2.2) and freely rotatably mounted around an axis of rotation (1) of said timepiece. The device is distinguished by the fact that the device comprises a differential (3) comprising an input mobile (3.1) able to be kinematically connected to a power source of the timepiece, a first output mobile (3.2) kinematically connected to the input mobile (3.1) by at least one satellite (3.4) and meshing with the second gear (2.1), a second output mobile (3.3) kinematically connected to said input mobile (3.1) by said least one satellite (3.4), and a control lever (4) for blocking either the first output mobile (3.2) or the second output mobile (3.3), so that the one between the first mobile output ( 3.2) and the second output mobile (3.3) which is released by the control lever (4) is capable of being driven by said input mobile (3.1) when the latter is kinematically linked to the power source of the timepiece, thus making it possible to block respectively of liberating r said split-second needle (2.2). The present invention also relates to a chronograph mechanism, respectively any other timepiece comprising such a device.