Cabezal automatizado de inyección de fluido para un dispositivo para la preparación de bebidas

The invention relates to a head assembly for a beverage preparation device for preparing a nutritional composition upon interaction of ingredients provided in a capsule with liquid supplied to the capsule, the assembly comprising capsule opening means (10) which are adapted to interact with an injection face of the capsule, the opening means comprising a liquid injection means (1) for injection of liquid into the capsule and a gas injection means (2) for injecting of gas into the capsule, activation means (20) designed for interacting with the opening means and for moving the liquid injection means and the gas injection means with respect to the injection face of the capsule. The head assembly also comprises a drive unit (70) for driving the activation means (20) and the activation means comprises a driving gear (20b) adapted to be driven in rotational movement by the drive unit (70) for sequentially moving the liquid injection means (1) and gas injection means (2).