Automatic coffee maker.

摘要

1. Automatic coffee machine, in which the mechanism for the preparation of the coffee is disposed horizontally and comprises an infusion chamber (1) intended to receive the coffee powder, this chamber presenting a lateral introduction opening (2) for the coffee powder and being obturated in at least one service position by two pistons (3, 4), and in which the first piston (3) obturating one of the ends of the chamber is mounted axially movable inside said chamber and comprises an hollow rod (3") used as axial inlet duct of the water or the steam, characterized by the fact that the second piston (4) is mounted axially movable from a service position obturating the other end of said infusion chamber and an out-of-service position outside a said chamber, this second piston (4) comprising a hollow piston rod (4") serving as axial outlet duct of the liquid coffee obtained, by the fact that each piston is mounted in a jointly displaceable manner with a carriage, said carriage being axially slidably mounted on longitudinal guides (8), and that a compression spring (12) is arranged between the head of the first piston and the carriage supporting it, said first piston (3) being axially displaceable in a limited way with regards to the carriage (5), and by the fact that it further comprises means for controlling the compression of the coffee powder in said infusion chamber (1), driving the travel of said first piston, the whole being arranged in such a manner that the coffee powder used and compressed in the form of a pellet is pushed to the end of the infusion chamber by the first piston continuing its stroke, said pellet falling down under the effect of the gravity outside the infusion chamber when said second piston is in its out-of-service position, said means for controlling the compress, on comprising a feeler (9) whose one end is bount with the head of the first piston (3) and whose other end cooperates with a telescopic microswitch supported by the carriage (5), said microswitch controlling the travel of the first piston and the feeding in water or steam through the hollow rod thereof.