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To overcome this disadvantage, some devices have pro-vided means for lowering, limiting and regulating the tem-perature of the water supply to the coffee injection group by using a cold water mixing device placed on the conduit supplying cold water from the cartridge to each injection post.
While this prior art solution constitutes an interesting compromise for coffeemakers constructed in this way, the present invention also provides a way to overcome tempera-ture variations, but in a more complete manner which encompasses the entire hot water circuit, allowing rapid preparation of inpidual servings of hot water, without either significant inertia or loss of efficiency, within each circuit and each group.
The present invention also solves the problem of regu¬lating water temperature and overcomes cost concerns, as it provides not only a simple, economical and easily assembled injection group, but also a means which consid¬erably simplifies independent production and regulation of hot water using a low cost, small capacity inpidual heating unit which heats instantly.
SUMMARY OF THE INVENTION
For this purpose, the invention provides a complete, autonomous inpidual unit for preparing “espresso” type coffee, comprising an inpidual heating unit and a light¬weight injection group.
The unit is characterized by comprising a simplified coffee injection group supplied with hot water by an indi¬vidual heating unit hydraulically connected to the corre¬sponding injection group by a flexible hydraulic connector through an electrovalve control, and in that the simplified injection group is comprised of a succession of assembled elements forming an interior chamber, which are attached directly to the lower plate of the front portion of the machine, said flexible connector terminating in a branch supplying the injection group through the lower plate, with a succession of elements comprising a cup support attached to said plate, and ending in a spray, replacing the central supporting projection of traditional injection blocks.
The advantages of the present invention surpass the sum of the general advantages of each of the features constituting the invention.
The simplified form and assembly of the unit reduces its cost. The inpidual circuits and separate heating units for instant production of hot water, together with the flexible, thermally insulated hydraulic connectors, maintain the ideal temperature for preparing numerous servings of coffee in succession.
The lightweight structure of the injection group ensures that the ideal water temperature for coffee preparation can be easily maintained.
BRIEF DESCRIPTION OF THE DRAWINGS
Other characteristics and advantages of the invention will be apparent from the following description, given by way of a non-limiting example, and accompanied by the attached drawings, wherein:
FIG. 1 is a perspective overview showing the uespresso?, coffeemaker, partially in cross-section, showing an indi¬vidual heating unit and the circuit associated with it;
FIG. 2 is a general schema of the water circuits in a conventional coffee maker with two injection groups and a mixer;
FIG. 3 is a perspective of a portion of a conventional coffeemaker showing the heating unit and its environment, as well as the injection group in the version having a mixer on the hot water preparation circuit;
FIGS. 4 and 5 are cross-sections of a disassembled injection group from a conventional machine and from the improved version according to the invention;
FIG. 6 is a schema illustrating an inpidual coffee preparation circuit within the machine according to the invention;
FIG. 7 is a transverse cross-section of the improved injection group;
FIG. 8 is a perspective from the front showing the portion of the machine specific to an inpidual circuit;
FIG. 9 is a perspective from the rear showing the portion of the machine specific to an inpidual circuit; and
FIG. 10 is a perspective showing the group attached to an exemplary coffee preparation station with an electrovalve attached to one element of the structure.