System for preparing hot beverages in automatic vending machines

System for preparing hot beverages in automatic vending machines, being of a type of known hot beverage automatic vending machines and especially for preparing coffee, which have a distribution chamber in which a corresponding dose of ground coffee is introduced and pressed, in such a way that the system comprises an assembly body of the system, in such a way that the distribution chamber has a first vertical resting and loading position and a second inclined product preparation position, being movable from one position to another by means of a pair of connecting rods to which the body connects rotatably by means of one end thereof, said pair of connecting rods being connected by their other end in eccentric position to respective driving rotating wheels, wherein the distribution chamber has a shaft to which a pair of connecting rods transmitting movement connect rotatably by one of their ends, said shaft being guided by a first pair of through side guides materialized in side walls of the assembly body of the system, whose first pair of grooves have a first horizontal section and a second section inclined with respect to the second product preparation position, a second shaft guided by a second pair of side guides materialized in the side walls of the assembly body of the whole system, collaborating in the guiding of the distribution chamber, having means for operating a bottom filter of the distribution chamber by means of a shaft clamped by a spring and integral to the filter by means of a screw.