Synthesis of Combined Geneva Mechanism with Cycloid Crank

When the slot number of the geneva is fixed, the kinematic coefficient of common geneva mechanism is a fixed value, too. Using the cycloid production mechanism as the drive crank of geneva is equal to the mechanism with a variable length, variable velocity and along the cycloid moving crank, which makes the kinematic coefficient of the geneva mechanism changed. A synthesis method of combined geneva mechanism is put forward according to the kinematic coefficients in this paper. The calculation method of the maximum and minimum kinematic coefficient and the geneva mechanism parameters are also proposed. The parameters of the combined geneva mechanism are presented, which the middle position of the kinematic range of the geneva has instantaneous dwell or approximate constant velocity characteristics.