Brewing device for a machine for preparing beverages, in particular coffee or tea

A brewing device for a machine for preparing beverages, the brewing device comprising:

• a brewing chamber having a longitudinal axis and an opening through which a material to be brewed may be loaded and discharged;
• a frame having two lateral walls arranged on opposite sides of the brewing chamber, and two fulcrum pins coaxial to each other and projecting outwards from the lateral walls;
• a closing body movable relative to the frame, away from and towards a sealed closing position in which the closing body sealingly closes the opening of the brewing chamber;
• a piston slidably mounted in the brewing chamber in a position axially opposite the closing body;
• and
• an actuating device to move the closing body and comprising a motor and a cam drive arranged between the motor and the closing body;
• wherein the cam drive comprises a barrel cam mounted coaxial to the brewing chamber, between the brewing chamber and the two lateral walls of the frame, and two cam followers slidably engaged in respective specular slots, each of which is formed in a corresponding one of the two lateral walls and extends parallel to the longitudinal axis to transform, during operation, a rotation of the barrel cam about the longitudinal axis into a translational motion of the respective cam follower along the longitudinal axis.