Expresso coffee machine provided with a device for whipping milk

Abstract: Expresso coffee machine provided with a device for whipping milk. It includes at least a coffee dispenser (5) and a whipping device (19) inserted in the stream supplying duct (9). Said stream supplying is integral with a member rotatory about a vertical shaft surrounding an annular chamber of the steam distributing body (18) fixed on the housing (1) and connected to the steam supply (2a) from the drum (32) and to the steam supplying duct (9), this latter being horizontally rotatable to locate itself close to the coffee pouring peak (4) on the tray (31) or outside said tray. In the drum (32) there is two hot water (3a) and stream (2a) intake ducts with electrically operated valves (2), (3) which converges at the distributor (8). Said electrically operated valves are related with an electronic circuit, several timers and push buttons to select: coffee plus stream according to two different doses, steam in a timed way, steam is a continuous way and hot water in a continuous way for cleaning.

Description: This invention refers to an expresso coffee machine, with which one can prepare other infusions, with one or several coffee dispensing groups, having automatic and/or manual cycles and provided with an emulsifying device, in general a Venturi, for whipping milk, to prepare the so-called Italian cappuccino coffee, one whipping device being contained in at least one of the steam supply ducts of machine, said device consisting of a tubular structure delimiting a mixing chamber provided with an air suction passage and a milk suction intake from a side nozzle, connected through a flexible duct to a milk container, such that through the suction originating in use within the device, air and milk are sucked by Venturi effect and in a duct diffusion area air and milk coalesce and are mixed with the hot steam producing a triple mixture, stream-air-milk, necessary to form the milk foam which is obtained by means of a dispensing nozzle located at the outlet of the steam supply duct. Different embodiments of above device for whipping milk and the association thereof to an expresso coffee machine are disclosed in namely documents US-A-4,949,631, EP-A-344859, EP-A-467666 and EP-A-575762. Patent EP-A-480928 discloses an automatic machine to supply black coffee, and the like, where an emulsifying device connected to a steam generator appears disclosed, wherein it is foreseen that the coffee supplying device and the milk supplying device are provided with respective very closely fixed distributing taps for directly supplying to the cup. This invention has the object of providing an expresso coffee machine with a device for whipping milk, of the type already known, associated to a steam supply duct, which has a movement which allows to locate the whipping milk dispensing nozzle close to the coffee distributing tap of one of the machine groups, to directly and simultaneously supply coffee and whipped milk to the cup, to an area away from said group, to only pour whipped milk to a cup or to an area outside the front tray which collects the machine wastes in order to fill a container such as a jug or a large vessel with whipped milk. In addition, according to the invention, the selective supply of hot water has been foreseen toward said steam duct provided with the whipping device to achieve a very effective cleaning of the whipping and suction duct assembly, which has to be removed beforehand from the milk container. This is achieved by a machine having the features defined in claim 1. Claims 2-7 define particular embodiments of the invention. The above and other objects, advantages and features of the present invention will become more apparent from the following description of certain preferred embodiments thereof. The invention will now be described in detail with reference to the accompanying drawings wherein: Fig. 1 is a view in part perspective of a coffee machine in which some walls have been eliminated to have a best view of the machine internal organs, related to the invention. Also the machine steam drum was assumed to be transparent to more clearly show the introduction of the steam and water supply ducts. Fig. 2 corresponds to a longitudinal section view of the steam distributing body which forms part of above device. Fig. 3, 4, 5 and 6 schematically show the different possibilities of performance of the whipping device by dispensing whipped milk respectively to a cup simultaneously with dispensing one or two coffee cups, to an area away from that of coffee direct supply and another external area of the machine for filling a large container such as a jug and the like. Fig. 7 shows, also schematically, the phase of performance of the device for the cleaning thereof. According to above figures, the expresso coffee machine with a device for whipping milk, object of this invention, is constituted by a conventional machine -1-which includes two electrically operated valves -2-, -3-associated to ducts for steam exhaust -2a- and hot water exit -2b-, respectively, as well as coffee supply nozzles -4-, -4a-, for one or two cups from a ladle-holder -5-. Characteristic of this invention is the fact that the steam exhaust -2a- and hot water exit -3a- ducts from a steam drum -32- (see Fig. 1) remain connected to a T part -6-, with the third exit duct thereof -7- deriving toward a distributing body -8- installed within the machine, close to its front wall and provided with a steam exhaust duct -9- which emerges outwardly from the machine through an oblong window -10- of said front part. Said distributing body -8- (see figure 2) has annular member -11- with a hole from which the duct -9- starts and said annular member -11- is coupled inside a cylindric narrowing -12- of the body -8-, provided with an annular cut which gives shape to an also annular chamber -13-, which communicates through one or several holes -13a- with an internal recess -14- of same body -8- to which the duct - 7- supplying water or steam converges, by a first end of the body -8-. In addition, there exists some annular grooves where respective sealing gaskets -15-, -16- are arranged as well as an obturating element -17- threaded to the body -8-closing a second end thereof and provided with a spring - 17a- and a washer -17b-. Such constitution allows the rotation on an horizontal plane of the steam or water exit duct -9- from the body -8- for positioning the nozzle -21- selectively dispensing whipped milk close to the peaks -4-, -4a- for pouring coffee of the ladle-holder -5-. Said duct -9- ends in a portion surrounded by a clamp -18- arranged coaxial and rotatory with respect to the duct -9- from which an arm -19a- starts toward the whipping device -19- with a nozzle -21- dispensing whipped milk, likewise rotatory, which internally produces Venturi effect between the steam inlet, the suction air controlled by a small valve with a driving wheel -20- and the inlet of milk from a flexible duct -22- connected to a container -23- thereof. On the other hand, the electrically operated valve - 2- is connected through an electronic circuit (not shown) which includes several adjustable timers, with a first and a second push buttons -24-, -25- susceptible to make such electrically operated valve -2- acts in timed way for a simultaneous volumetrically controlled dispensing of coffee according two differentiated dosings (figures 3 and 4). Also, a third push button -26- (figure 5) only activates the electrically operated valve -2-, in a timed way, in the case of whipped milk supply to a cup -27- or container separated from the tray -31- of coffee dispensing and a fourth push button -28- activates said electrically operated valve with interlocking at a position of opening and continuous steam dispensing (figure 6) to supply whipped milk toward a jug or the like -29-. In this invention, the possibility was also foreseen to clean the whole device (figure 7) consisting in disconnecting the flexible duct -22- from the container - 23- and through a fifth push button -30-, interrelated through the mentioned electronic circuit with the second electrically operated valve -3- of hot water intake from the drum -32-, to provoke the interlocking thereof to a position of permanent opening and so let the hot water passes continuously along the whole device -19- and duct - 22- of milk suction producing the cleaning thereof

Claims: Expresso coffee machine with one or several coffee dispensing groups, having automatic and/or manual cycles and provided with an emulsifying device (19), for whipping milk in order to prepare the so-called Italian cappuccino coffee, one whipping device (19) being contained in at least one of the steam supply ducts (9) of the machine, said device (19) consisting of a tubular structure delimiting a mixing chamber provided with an air suction passage and a milk suction intake from a side nozzle connected through a flexible duct to a milk container (23), such that through the suction originating in use within the device (19), air and milk are sucked by Venturi effect and in a duct diffusion area the sucked air and milk coalesce and are mixed with the hot steam producing a triple mixture, steam-air-milk, necessary to form the milk foam which is obtained by means of a dispensing nozzle (21) located at the outlet of the steam supply duct characterized in that at its upstream end the said at least one steam supply duct (9) containing said whipping device (19) is operationally connected by means of a steam or water distributing body (8) to a steam feed duct (7) fed from the machine boiler (32), whereby an annular member (11) surrounds a vertical portion of said distributing body (8) such as to be rotatable thereabout and interconnects therewith via an annular chamber (13) formed about said distributing body (8) so as to establish a fluid flow connection between the steam feed duct (7) and the steam supply duct (9), and said annular member (11) further communicating with said steam supply duct (9), in such a way that the latter is capable to horizontally rotate to be selectively positioned close to a coffee pouring outlet (4, 4a) of one of the dispensing groups, in a position away thereof on the tray for collecting coffee machine wastes, or at a point outside said tray, for filling containers (29) of different sizes, and in that two hot water (3a) and steam (2a) intake differentiated ducts have been foreseen, provided with an independently performing electrically operated valve (2, 3) and which converge in said distributing body (8). Machine, according to above claim characterized in that said annular member (11) is formed by a collar with a hole from which starts said steam supply duct (9), which collar is coaxially coupled on a cylindrical narrowing (12) of said distributing body (8), provided with an annular cut which gives shape to said annular chamber (13), which communicates through one or several holes (13a) with an internal recess (14) of said distributing body (8), to which converges, by a first end, a steam or water feed duct (7), likewise annular grooves existing which house corresponding sealing gaskets (15), 16) above and under said cut and an obturating element (17) attached by threading to said distributing body (8) and closing the second end thereof having been foreseen. Machine, according to the claim 1, characterized in that said steam or water distributing body (8), is located within the machine, close to its front wall and said steam supply duct (9) emerges outwardly from the machine through an oblong window (10) of said front part. Machine, according to the claim 1, characterized in that the electrically operated valve (2) associated to the steam intake duct (2a) remains connected through an electronic circuit which comprises several adjustable timers with at least: a first and a second push buttons (24, 25), capable of activating said electrically operated valve (2) in timed way and simultaneously to the volumetrically controlled coffee dispensing, according to two differentiated dosings; with a third push button (26) which only activates said electrically operated valve in timed way; and with a fourth push button (28) which activates said electrically operated valve (2), interlocking it in a position of continuous opening and steam dispensing. Machine, according to the claim 4, characterized in that the electrically operated valve (3) inserted in the hot water intake duct (3a) is interrelated through referred electronic circuit with a fifth push button (30) of the electrically operated valve (3) interlocking, in position of permanent opening to continuously supply hot water, in cleaning functions of the whipping device, with prior removal of the milk flexible sucking duct (22) of respective container (23). Machine, according to claim 1, characterized in that the milk whipping device (19) is attached to an arm (19a) which is ended by a clamp member (18) arranged coaxial and rotatory to an end portion of said steam supply duct (9), with possibility of rotating said whipping device (19) about and coaxial to said end portion of said duct (9). Machine, according to claim 6, characterized in that said milk whipping device (19) includes a valve which can be driven by a small wheel (20) to regulate the air intake passage toward the mixing chamber.

Inventors: ROURE BOADA JORGE, ROURE BOADA, JORGE
Applicants: GAGGIA ESPANOLA SA, GAGGIA ESPANOLA, SA
Application year: 1997
Main classification: A47J31
IPC codes: A47J31