A receptacle holding unit for a beverage preparation device includes a first part and a second part cooperating with the first part; a cavity for receiving a receptacle containing an ingredient; and a driving device for relatively moving the second part towards the first part into a closed position for securing such receptacle in the cavity and relatively apart from the first part into an open position for inserting of the receptacle into the cavity. The driving device has an actuator and a transmission that has a helicoidal ramp arrangement cooperating with a connector member for converting a translational movement into a rotational movement or vice versa. When the actuator actuates the transmission, the first and second parts are driven together or apart by the ramp arrangement cooperating with the connector member.