Abstract: A milk frother comprising a steam fitting with a steam flow dispenser, a homogenization element, a hollow longitudinal body having a seat engaging the steam fitting, a steam, air and milk mixing chamber, an air access channel, and a milk access channel both to the mixing chamber. The steam fitting has steam access to the mixing chamber, the hollow longitudinal body has an outlet for frothed milk from the mixing chamber, and the outlet has a dispensing end engaging with the homogenization element. A permanent connection provided between the hollow longitudinal body and the steam fitting, having a variable configuration between a first engagement and a disengagement configuration between the steam fitting and the engagement seat. A second permanent connection provided between the hollow longitudinal body and the homogenization element, having a configuration that is variable between a second engagement and a disengagement configuration between the homogenization element and the dispensing end.

Abstract: An infusion unit having a closing piston, an infusion cylinder, and an ejection piston (for ejecting spent coffee). The piston can slide inside the infusion cylinder, between a retracted position and an extended position, for ejection of the spent coffee. Operation of the ejection piston can involve an oscillating rocker having a first arm (for driving the ejection piston) and a second arm (for engaging the oscillating movement of the rocker). The oscillating rocker can involve a first control cam arranged to generate oscillation in a direction driving toward the extended position of the ejection piston, or a second control cam arranged to generate oscillation in a direction driving toward the retracted position of the ejection piston.

Abstract: The infusion unit (1) for a coffee machine, comprising a closing piston (3), an infusion cylinder (2), an ejection piston (5) for ejecting the load of spent coffee (30), said piston (5) sliding inside the infusion cylinder (2) in the direction of the axis of the infusion cylinder (2) between a retracted position and an extended position for ejection of the load of spent coffee (30), and operating means for the ejection piston (5), comprising an oscillating rocker (32) having a first arm (33) provided with a member for driving the ejection piston (5) and a second arm (35) provided with a member for engaging the oscillating movement of the rocker (32) selectively from a first control cam (37) configured and arranged in such a manner as to generate an oscillation of the rocker (32) in the direction corresponding to the driving towards the extended position of the ejection piston (5), or with a second control cam (38) configured and arranged in such a manner as to generate an oscillation of the rocker (32) in the