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Electrovalve 48 may be attached to one of the following portions of the body of the machine: the body of the inpidual heating unit (46) or a cross bar 82 on the front portion of the frame, or a crosspiece or other component of the chassis large enough to provide an adequate thermal dissipation surface, as shown in FIG. 10.
The machine may be purely manual or semi-automatic, with a keypad control such as 83 and 84.
After passing through softener 23, which comprises a supplementary outlet in central heating unit 20, the cold water is admitted into injection pump 24, the outlet of which supplies each inpidual heater 46 through an inpidual water meter 85.
All the functions are controlled by a microprocessor LP using an internal program customized for the machine, with
the commands received from keypads 83, 84 on the front portion 12 of the machine, and data regarding water quantity supplied in code by the inpidual water meter 85, taking into account the values of temperature sensor 78 in indi¬vidual heating unit 46.
The function sequence is as follows:
Microprocessor IP records the commands and then causes electrovalve 48 to open pump 24 and operate; the flow of water from pump 24 activates water meter 85. The elemen¬tary water quantity values are transmitted as impulses to the microprocessor and stored by it. When the amount of water corresponds to the amount selected, the microprocessor stops pump 24 and closes the main valve of the electrovalve between heater 46 and the corresponding injection group, while simultaneously opening the valve leading to the discharge conduit.
The desired amount of hot water passes over the ground coffee, leaving the unit as a liquid extract and filling the cup or cups placed beneath the group.
After the quantity of hot water has been injected into the coffee and the pressure lowered when pump 24 stops, the water remaining in the pneumatic capacity empties by decompression through the terminal branch of the circuit, and is then evacuated through the electrovalve control 48 and discharge outlet 80.
Discharging the water in this way, through conduit 65 of hydropneumatic storage 64, ensures that all residual water is evacuated and eliminates the possibility of it being mixed with the hot water for a new batch.
We claim:
1. An inpidual coffee preparation unit for the prepara¬tion and distribution of coffee for an espresso coffeemaker, the inpidual coffee preparation unit comprising:
a body (8) having a lower support plate (9) for supporting at least one cup and a front portion (11) of the indi¬vidual coffee preparation unit having a lower base plate (12), spaced from the lower support plate (9), support¬ing a plurality of coffee preparation units (2,3, 4), each one of the plurality of coffee preparation units (2, 3, 4) having a coffee injection group (40, 41) connected to a supply of electrically heated water for receiving water and preparing coffee;
wherein each one of the injection groups (40, 41) is connected to an inpidual heating unit (46) via a first flexible hydraulic connector (47), an electrovalve (48) is provided in the flexible hydraulic connector (47) to control a flow of heated water therethrough, and each one of the injection groups (40, 41) comprises a suc-cession of assembled elements directly attached to the subsurface of the lower base plate (12) of the front portion (11), the succession of assembled elements defines an distribution chamber communicating with a spray element (51), and a holder (55) is attached to the subsurface of the lower base plate (12) for supporting a container supporting coffee, and an end of the first flexible hydraulic connector (47), remote from the inpidual heating unit (46), communicates with the distribution chamber for supplying heated water to the injection group (41) for preparing coffee.
2. The inpidual coffee preparation unit according to claim 1, wherein each one of the injection groups (40, 41) has a second flexible hydraulic connector (65) which con¬nects a hydropneumatic storage (64) with the distribution chamber (63) of the succession of assembled elements, and each the succession of assembled elements terminates with the spray element (51) to facilitate discharge of the heated water from the injection group (40, 41).