CH717943A2 - Dosing device for a liquid preparation manufacturing machine. - Google Patents

Abstract

Dosing device (500) for a liquid preparation manufacturing machine, comprising a liquid reservoir (1) for storing a fluid and for supplying, via an inlet channel (2), at least a pump (3) arranged to force the passage of the fluid, in the liquid and/or vapor state, through at least one dispenser (4) comprising at least one ingredient, for the preparation of this preparation, and to deliver this preparation to an outlet channel (5), this metering device (500) comprising means for continuously measuring the mass of the reservoir (1) and its contents, or else the contents of the reservoir (1) alone .

Description

Field of the invention

The invention relates to a metering device for a liquid preparation manufacturing machine, comprising a liquid reservoir for storing a fluid and for supplying, through an inlet channel, at least one pump arranged to force the passage of said fluid, in the liquid and/or vapor state, through at least one dispenser arranged to contain at least one ingredient, for the preparation of said preparation, and to deliver said preparation to at least one output channel.

The invention also relates to a liquid preparation manufacturing machine, comprising at least one such metering device.

The invention relates to the field of capital goods for the manufacture of liquid preparations individually or in small quantities, for individuals, or small communities such as tea rooms, restaurants and caterers, or even offices. , for example for the manufacture of soups, coffees, or other preparations obtained by passing a fluid over an ingredient stored in a reduced form, such as a sachet of freeze-dried product, a dose of coffee or tea powder , a dose of tomato concentrate, or other.

The principle of the invention is also applicable to other means of production comprising a metering function, for example for the preparation of pharmaceutical compositions in pharmacies, or others.

Background of the invention

[0005] The making of liquid preparations such as a cup of coffee, tea, soup, or the like, in a substantially unitary manner, has been facilitated by the packaging of the ingredients in a small volume, in sachets, capsules or pods, designed to the delivery of a standard quantity corresponding to a cup of more or less large volume, in parallel with the marketing of small, simple, compact machines, designed to manufacture these preparations with user interventions reduced to simple tasks: introduction of a liquid, usually water, into a tank, introduction of an ingredient package into a chamber or a slot, selection of a variation of the preparation, in terms of quantity or density, and start of a cycle.

[0006] The liquid is conveyed by a pump, directly or through a boiler, to pass through the prepared ingredient. Generally the selection made by the user corresponds to a pre-determined cycle duration, which is managed by a timer controlling the duration of operation of the pump and any boiler. However, it is common to observe strong variations in the volume dispensed, for the same initial setting, and the causes of which are multiple: hardness of the water, scaling of the device and in particular of the pump, wear of the pump, imprecise position ingredient packaging in its chamber or slot, or the like.

Summary of the invention

The invention proposes to provide a simple and inexpensive solution, and therefore compatible with mass market machines, to these qualitative drifts.

To do this, the invention proposes to ensure a volume of preparation delivered to the user, which is constant, thanks to differential measurements.

[0009] The introduction of a mass sensor under the liquid tank, and the monitoring of the mass delivered, make it possible, by means of a simple correlation taking into account the losses by vaporization, to deliver the quantity of liquid just necessary to ensure the accuracy of the required amount of liquid preparation. And, of course, to keep the pump and boiler running for as long as necessary.

To this end, the invention relates to a metering device for a liquid preparation manufacturing machine, according to claim 1.

The invention also relates to a liquid preparation manufacturing machine, comprising at least one such metering device.

Brief description of the drawings

Other characteristics and advantages of the invention will appear on reading the detailed description which follows, with reference to the appended drawings, where: FIG. 1 schematically represents a metering device according to the invention; FIG. 2 schematically represents a liquid preparation manufacturing machine, comprising such a metering device according to the invention.

Detailed Description of Preferred Embodiments

The invention proposes to ensure a volume of preparation delivered to the user, which is constant.

The principle consists in exploiting the continuous measurement of the mass of the liquid reservoir upstream of the preparation machine.

[0015] To do this, it is useful to memorize the curve mTN(t) visible in FIG. 4, and the time ΔtN corresponding to the calibration, for the manufacture of a particular liquid preparation. This curve is the theoretical curve resulting from learning, in particular in manual mode.

The subsequent manufacture of such a particular liquid preparation follows a curve according to Figure 5, with a cycle time which is greater than or equal to the reference cycle time ΔtN of Figure 4.

[0017] It is then a question of comparing the surface under the mT(t) curve with that of mTN(t), a variation greater than a pre-determined threshold, for example and not limited to 15%, is l index of a problem. The use of the surface, for manufacturing monitoring, is preferable to monitoring a deviation between the two curves or between their slopes, because the surface is less sensitive to local noises/peaks and therefore the control is more robust and reliable.

[0018] Figure 3 is a simplified diagram of a machine for manufacturing a liquid preparation, with a liquid reservoir, upstream of the machine of which only a pump is shown, and downstream an outlet channel supplying a container .

We call mT(t) the mass at time t of liquid present in this container, which is equivalent to the mass of liquid pumped from the tank and conveyed into the container, and mR(t) the mass at time t of the tank of liquid, i.e. the total of the mass of the structure of the tank and the mass of the quantity of liquid present in the tank at time t. The notation mp(mpsurmounted by a dot) corresponds to the mass flow rate of the pump.

[0020] Adjusting the machine includes a calibration phase: this is the calibration of the volume desired by the user. This volume corresponds to a mass of liquid mTN, pumped from the liquid reservoir of the machine, and to a filling time ΔtN(N for nominal) depending on the flow rate of the pump.

[0021] This calibration cycle is managed by the user, for example by pressing and holding a button or a push button, or other. This cycle starts at time to and ends at t1N (ΔtNcorresponds to the difference).

[0022] FIG. 4 is the schematic representation of the calibration curve mT(t), in a particular, non-limiting case, of a constant pump flow rate.

[0023] The operational use of the machine is based on this initial calibration, for a particular liquid preparation, which is particular at least in quantity, and which can also be particular as regards the density, the liquid and/or the ingredients used, outlet temperature, or other.

The operating cycle starts at time toet ends at t1. At time to, the mass in the tank is mR(t0)=mR0We calculate the instantaneous mass at time t: mT(t) =mR0- mR(t).

This calculation is based on the continuous measurement of the mass mR(t) (the only quantity measured).

[0026] The presence of a disturbance, such as an unexpected filling of the tank (resulting in a negative value of mT(t)), or a technical anomaly such as the presence of scale in the circuits, a malfunction of the pump or a boiler, changes the real mT(t) curve differently from that of the mTN(t) calibration curve, as shown in figure 5.

[0027] Therefore, if the operation of the pump is stopped at t1N, the filling volume of the container will not be exact.

The proposal consists in comparing the current mT(t) curve with the reference mTN(t) calibration curve which will have been stored. The comparison is based on a calculation of area under the curve S(t): and SN(t) = mTN(u)du The advantage of comparing surfaces rather than the curves themselves is advantageous due to the smoothing effect of the integral, less sensitive to point defects In the event of too great a difference between S(t) and SN(t), it is possible to trigger an alarm, to warn the user and/or an automated control system: if in addition mR(t) increases (case of an unexpected filling), the pump is stopped and resumed when mR(t) no longer changes; if mR(t) decreases, this is the sign of an anomaly such as too low a flow rate, which should trigger the proposal for a maintenance action to be carried out.

More particularly, the invention relates to a metering device 500 for a machine 1000 for manufacturing liquid preparations. This metering device 500 comprises a reservoir 1 of liquid for storing a fluid and for supplying, through an inlet channel 2, at least one pump 3. This pump 3 is arranged to force the passage of the fluid, in the liquid and/or vapor state, through at least one dispenser 4 arranged to contain at least one ingredient, for making the preparation, and to deliver the preparation to at least one outlet channel 5.

According to the invention, the metering device 500 comprises means for continuously measuring the mass of the contents of reservoir 1, or else the mass of reservoir 1 and its contents. Indeed, it is possible to carry out a preliminary taring of the tank. Any measurement set out below can of course be made in relative or absolute terms.

[0031] More particularly, the means for continuously measuring the mass of the tank 1 and its contents, or else the contents of the tank 1 alone, comprise means 20 for weighing the tank 1 and its contents, which are interfaced with control means 10 that comprises the metering device 500, and which are arranged to determine the initial mass of the reservoir 1 and its contents, or else of the contents of the reservoir 1 alone, from the start of a manufacturing cycle of the preparation. These control means 10 are further arranged to calculate a mass of liquid to be delivered upstream of the pump 3, depending on the nature of the liquid preparation, the density or aromatic density of the liquid preparation, the at least one ingredient, of the fluid, and the quantity required at the start of the manufacturing cycle. These control means 10 are further arranged to actuate the operation of the pump 3 during the launch of the cycle, to continuously control the weighing of the instantaneous mass of the reservoir 1 and its contents, or else of the contents of the reservoir 1 alone, and to deliver the required amount of the liquid preparation to the outlet channel 5.

[0032] More particularly, the control means 10 are arranged to be activated for the launch of the manufacturing cycle, either by an action of a user on a control panel 11 interface with the control means 10, or by a command carried out by an automated system interfaced with the control means 10.

[0033] More particularly, the control means 10 are arranged to detect an unexpected filling of the tank 1 during the operation of the pump 3. More particularly, the control means 10 are arranged to stop the pump 3 in the event of finding of increase in the instantaneous mass of tank 1 and its contents, or else of the contents of tank 1 alone. of its contents, or else of the contents of tank 1 alone, wait for stabilization of the mass, and restart the supply cycle of pump 3 until the complete delivery of the required quantity of the preparation to the outlet channel 5, and stopping the operation of pump 3 when the comparison indicates that the entire mass of liquid to be delivered has been delivered to pump 3.

[0034] More particularly, the control means 10 are arranged to measure the value of the initial mass of the reservoir 1 and its contents, or else of the contents of the reservoir 1 alone, at the moment of the start of a manufacturing cycle. , and, in the event of a finding of constancy or reduction in the instantaneous mass of tank 1 and its contents, or else of the contents of tank 1 alone, continuously carry out the comparison between on the one hand the value of the mass of liquid at deliver and on the other hand the value of the difference between the initial mass and the instantaneous mass, and stop the operation of pump 3 when the comparison indicates that the entire mass of liquid to be delivered has been delivered to pump 3.

[0035] More particularly, the control means 10 are arranged to, in the event of a finding of an increase in the instantaneous mass of the tank 1 and its contents, or else of the contents of the tank 1 alone, record in the storage means 12 , which the control means 10 comprise, a first intermediate value which is the value of the instantaneous mass of the reservoir 1 and of its contents, or else of the contents of the reservoir 1 alone, at the moment when the instantaneous mass increases. And these control means 10 are arranged to follow the weighing means 20 until a finding of stabilization of the instantaneous mass at a second intermediate mass, to calculate the difference between the second intermediate mass and the first intermediate mass, and to calculate a new upstream mass which is the total of the initial mass and the difference, and to restart the operation of the pump 3 and continuously carry out the comparison between on the one hand the value of the mass of liquid to be delivered and on the other hand the value of the difference between the upstream mass and the instantaneous mass, and to stop the operation of pump 3 when the comparison indicates that the entire mass of liquid to be delivered has been delivered to pump 3.

[0036] More specifically, the metering device 500 comprises closure means 13 arranged to prohibit the filling of the tank 1 during the launch of the manufacturing cycle and until the moment when the entire mass of liquid to be delivered has been delivered to pump 3.

[0037] More specifically, the control means 10 comprise means 12 for storing, for each type of liquid preparation based on a pair formed by a fluid and an ingredient, the correlation between the quantity of fluid to be provided and the amount of liquid preparation delivered.

More particularly, the metering device 500 comprises, downstream of the outlet channel 5, at least one receptacle 6, which is arranged to receive at least one container intended to receive the liquid preparation, and comprises secondary weighing means 30, which are interfaced with the control means 10, and are arranged for the measurement of the tare constituted by the at least one container, and for the continuous monitoring of the quantity of liquid preparation delivered.

More particularly, the metering device 500 comprises, at the level of the inlet channel 2, at least one inlet flowmeter 40, interface with the control means 10 and a clock 50 that the control means 10 comprise, for continuous control of the quantity of fluid delivered to the pump 3.

More particularly, the metering device 500 comprises, at the level of the output channel 5, at least one output flowmeter 60, interface with the control means 10 and a clock 50 that the control means 10 comprise, for the continuous monitoring of the quantity of the liquid preparation delivered by the outlet channel 5.

More particularly, the metering device 500 comprises, between the pump 3 and the at least one metering device 4, at least one boiler 70 for heating and/or vaporizing the fluid before it passes through the at least one metering device 4.

[0042] In a particular variant, the control means 10 comprise a long-term monitoring function of a machine 1000 incorporating such a metering device 500. The control then makes it possible to monitor the ratio between on the one hand a duration initial, measured, during learning or first use, and corresponding to the supply of the mass of liquid to be delivered to provide the ideal volume, and on the other hand the actual time required to provide the same mass after several month/year of functions to introduce, for a particular preparation, and to compare in real time this ratio with a pre-determined threshold value of this ratio, threshold which once exceeded gives rise to the display of a maintenance message of the machine 1000 or of the metering device 500, to trigger descaling or another maintenance operation. It is understood that this control of the duration of the manufacturing cycle of a liquid preparation does not have the effect of managing the operation of the machine 1000 or of the metering device 500 for the manufacture of a liquid preparation, but of allowing a maintenance monitoring of the equipment during its lifetime.

[0043] Thus, if this machine 1000 works perfectly when purchased, with an initial volume of water required of 100% for a certain cycle duration, after several months of use and depending on the hardness of the water, the same volume of 100% may take much longer to deliver. The invention makes it possible to avoid managing the unit cycle time for the manufacture of a liquid preparation, and this provision for integrating a threshold into the control process makes it possible to avoid the case where the volume which passes through the pump 3, the doser 4, and the possible boiler 70, becomes so weak that the pump 3 operates much longer than reasonable, which weakens it and risks leading to its destruction if a maintenance operation is not triggered on time.

[0044] More specifically, the control means 10 comprise a control panel 11, or are interfaced with a control panel 11, and include a learning cycle arranged to allow a user to manually prepare a particular liquid preparation, and to select the quantity of the liquid preparation, and/or the nature of the liquid preparation, and/or the density or the aromatic density of the liquid preparation, and/or the nature of at least one ingredient, and/or the nature of the fluid, and to trigger automatic storage of the operating parameters of the metering device 500 for this particular liquid preparation, and the correlation between the quantity of the liquid preparation at the outlet channel 5 and the mass of liquid to be delivered upstream of the pump 3.

[0045] More specifically, the control means 10 comprise a control panel 11, or are interfaced with a control panel 11, and include a learning cycle arranged to allow an automated system interfaced with the control means 10 to control the delivery of a particular liquid preparation, and to select the quantity of the liquid preparation, and/or the nature of the liquid preparation, and/or the density or the aromatic density of the liquid preparation, and/or the nature of the at least one ingredient, and/or the nature of the fluid, and to trigger an automatic memorization of the operating parameters of the dosing device 500 for this particular liquid preparation, and the correlation between the quantity of the liquid preparation delivered by the outlet channel 5 and the mass of liquid to be delivered upstream of pump 3.

The invention also relates to a machine 1000 for manufacturing a liquid preparation, comprising at least one such metering device 500.

More particularly, this machine 1000 is arranged for the instant manufacture of liquid food preparation based on at least one powdery or concentrated or freeze-dried ingredient, and at least one fluid, and the at least one dispenser 4 consists by a percolator filter, or a sachet, or a capsule, or a cartridge or a pod and comprises a dose of at least one ingredient.

More specifically, the machine 1000 is arranged for the instant production of coffee, and is a community percolator, or a domestic machine.

Claims (24)

1. Dosing device (500) for a liquid preparation manufacturing machine (1000), comprising a liquid reservoir (1) for storing a fluid and for supplying it, through an inlet channel (2) , at least one pump (3) arranged to force the passage of said fluid, in the liquid and/or vapor state, through at least one dispenser (4) arranged to contain at least one ingredient, to making said preparation, and for delivering said preparation to at least one outlet channel (5), characterized in that said metering device (500) includes means for continuously measuring the mass, or else said reservoir (1 ) and its contents, or only the contents of said reservoir (1). 2. Metering device (500) according to claim 1, characterized in that said means for continuously measuring the mass of said tank (1) and its contents, or else the content of said tank (1) alone, comprise means weighing (20) of said tank (1) and its contents, or of the content of said tank (1) alone, interfaces with control means (10) that said metering device (500) comprises and which are arranged to determine the initial mass of said reservoir (1) and its contents, or of the contents of said reservoir (1) only, from the start of a manufacturing cycle of said preparation, and to calculate a mass of liquid to be delivered upstream of said pump (3), depending on the nature of said liquid preparation, the density or aromatic density of said liquid preparation, said at least one ingredient, said fluid, and the quantity required during said launch of the manufacturing cycle, and to actuate the operation of said pump (3) during the said start of said cycle, to continuously control the weighing of the instantaneous mass of said tank (1) and its contents, or of the content of said tank (1) alone, and to deliver the required quantity of said liquid preparation to said outlet channel (5). 3. Dosing device (500) according to claim 2, characterized in that said control means (10) are arranged to be activated for the launch of said manufacturing cycle, or else by an action by a user on a control console. control (11) interface with said piloting means (10), or else by a command carried out by an automated system interfaced with said piloting means (10). 4. Metering device (500) according to claim 2 and according to one of claims 1 to 3, characterized in that said control means (10) are arranged to detect an unexpected filling of said tank (1) during the operation of said pump (3). 5. Metering device (500) according to claim 4, characterized in that said control means (10) are arranged to stop said pump (3) in the event of an increase in the instantaneous mass of said tank (1) and of its contents, or of the contents of said reservoir (1) alone. 6. Dosing device (500) according to claim 5, characterized in that said control means (10) are arranged for, in the event of observation of an increase in the instantaneous mass of said tank (1) and its contents, or of the content of said reservoir (1) alone, wait for the stabilization of said mass, and restart the supply cycle of said pump (3) until the complete delivery of said required quantity of said preparation to said outlet channel (5) , and stopping the operation of said pump (3) when said comparison indicates that all of said mass of liquid to be delivered has been delivered to said pump (3). 7. Dosing device (500) according to claim 5 or 6, characterized in that said control means (10) are arranged to measure the value of the initial mass of said tank (1) and its contents, or else only content of said tank (1), at the moment of starting a said manufacturing cycle, and, in the event of a finding of constancy or reduction in the instantaneous mass of said tank (1) and its contents, or else of the content alone of said reservoir (1), continuously comparing on the one hand the value of said mass of liquid to be delivered and on the other hand the value of the difference between said initial mass and said instantaneous mass and stopping the operation of said pump (3) when said comparison indicates that all of said mass of liquid to be delivered has been delivered to said pump (3). 8. Metering device (500) according to claim 2, and according to one of claims 4 to 7, characterized in that said control means (10) are arranged to, in the event of a finding of an increase in the instantaneous mass of said reservoir (1) and its contents, or of the contents of said reservoir (1) alone, recording in storage means (12), which said control means (10) comprise, a first intermediate value which is the value of the instantaneous mass of said tank (1) and its contents, or else of the content of said tank (1) alone, at the moment when said instantaneous mass increases, to follow said weighing means (20) until a finding of stabilization of said instantaneous mass to a second intermediate mass, to calculate the difference between said second intermediate mass and said first intermediate mass, and to calculate a new upstream mass which is the total of said initial mass and said difference, and to restart operatione said pump (3) and continuously carry out the comparison between on the one hand the value of said mass of liquid to be delivered and on the other hand the value of the difference between said upstream mass and said instantaneous mass, and to stop operation of said pump (3) when said comparison indicates that all of said mass of liquid to be delivered has been delivered to said pump (3). 9. Metering device (500) according to claim 2 and according to one of claims 1 to 8, characterized in that said metering device (500) comprises closing means (13) arranged to prevent the filling of said reservoir (1) when starting said manufacturing cycle and until all said mass of liquid to be delivered has been delivered to said pump (3). 10. Dosing device (500) according to claim 2 and according to one of claims 1 to 9, characterized in that said control means (10) comprise memory means (12), for each type of liquid preparation to be based on a pair of said fluid and said ingredient, the correlation between the quantity of said fluid to be supplied and the quantity of liquid preparation delivered. 11. Metering device (500) according to claim 2 and according to one of claims 1 to 10, characterized in that said metering device (500) comprises, downstream of said outlet channel (5), at least one receptacle (6) arranged to receive at least one container intended to receive said liquid preparation, and comprises secondary weighing means (30) interfaced with said control means (10), and arranged for measuring the tare constituted by said at least a container, and for continuous monitoring of the quantity of liquid preparation delivered. 12. Metering device (500) according to claim 2 and according to one of claims 1 to 11, characterized in that said metering device (500) comprises, at said inlet channel (2) at least one flowmeter input (40), interface with said control means (10) and a clock (50) that said control means (10) comprise, for the continuous control of the quantity of fluid delivered to said pump (3). 13. Metering device (500) according to claim 2 and according to one of claims 1 to 12, characterized in that said metering device (500) comprises, at said outlet channel (5), at least one flowmeter outlet (60), interface with said control means (10) and a clock (50) that said control means (10) comprise, for the continuous control of the quantity of said liquid preparation delivered by said outlet channel ( 5). 14. Metering device (500) according to one of claims 1 to 13, characterized in that said metering device (500) comprises, between said pump (3) and said at least one metering device (4), at least one boiler (70) for heating and/or vaporizing said fluid before it passes through said at least one metering device (4). 15. Metering device (500) according to claim 2 and according to one of claims 1 to 14, characterized in that said control means (10) comprise a control panel (11) or are interfaced with a control panel (11), and comprise a learning cycle arranged to allow a user to manually prepare a particular liquid preparation, and to select the quantity of said liquid preparation, and/or the nature of said liquid preparation, and/or the density or the aromatic density of said liquid preparation, and/or the nature of said at least one ingredient, and/or the nature of said fluid, and to trigger automatic storage of the operating parameters of said metering device (500) for this particular liquid preparation , and the correlation between said quantity of said liquid preparation in said outlet channel (5) and said mass of liquid to be delivered upstream of said pump (3). 16. Metering device (500) according to claim 2 and according to one of claims 1 to 15, characterized in that said said control means (10) comprise a control panel (11) or are interfaced with a control panel. command (11), and comprise a learning cycle arranged to allow an automated system interfaced with said control means (10) to command the delivery of a particular liquid preparation, and to select the quantity of said liquid preparation, and /or the nature of said liquid preparation, and/or the density or the aromatic density of said liquid preparation, and/or the nature of said at least one ingredient, and/or the nature of said fluid, and to trigger an automatic memorization of the parameters of operation of said dosing device (500) for this particular liquid preparation, and the correlation between said quantity of said liquid preparation delivered by said outlet channel (5) and said mass of liquid to be delivered upstream of said pump (3). 17. Machine (1000) for manufacturing a liquid preparation, comprising at least one metering device (500) according to one of claims 1 to 16. 18. Machine (1000) according to claim 17, characterized in that said machine (1000) is arranged for the instant manufacture of liquid food preparation based on at least one powdery or concentrated or freeze-dried ingredient, and at least one fluid, in that said at least one doser (4) consists of a percolator filter, or a cartridge, or a sachet, or a capsule, or a pod, and comprises a dose of said at least one ingredient. 19. Machine (1000) according to claim 17 or 18, characterized in that the control means (10) comprise a monitoring function for monitoring in real time the ratio between on the one hand an initial duration, measured, during the learning or first use, and corresponding to the supply of the mass of liquid to be delivered to provide the ideal volume, and on the other hand the actual duration necessary to supply the same mass after several months/year of introduce, for a particular preparation, and compare in real time this ratio with a pre-determined threshold value of this ratio, threshold which once exceeded gives rise to the display of a maintenance message, to trigger a maintenance operation . 20. Machine (1000) according to one of claims 17 to 19, characterized in that said machine (1000) is arranged for the instant production of coffee, and is a percolator for communities, or a domestic machine. 21. Process for the instantaneous manufacture of a liquid preparation based on at least one pulverulent or concentrated or freeze-dried ingredient, and at least one fluid, in a machine (1000) for manufacturing a liquid preparation, comprising a reservoir (1) of liquid for the storage of a said fluid and for the supply, via an inlet channel (2), of at least one pump (3) arranged to force the passage of said fluid, in the liquid state and/ or steam, through at least one dispenser (4) arranged to contain at least one said ingredient, for making said preparation, and for delivering said preparation to at least one outlet channel (5), characterized in that that said machine (1000) is equipped with a metering device (500) which comprises means for continuously measuring the mass, either of said reservoir (1) and its contents, or else of the contents of said reservoir alone ( 1), in that the total quantity of liquid preparation to be delivered is estimated, at the outlet of said machine (1000) at the level water from each said outlet channel (5), in that the total quantity of fluid to be supplied upstream at the level of said inlet channel (2) is estimated in order to obtain at the outlet said total quantity of liquid preparation at deliver, in that said reservoir (1) is fed with at least said total quantity of fluid to be supplied, in that said at least one dispenser (4) is fed with at least one said ingredient, and in that said machine (1000) is operated, continuously or in stages, until said metering device (500) determines that all of said total quantity of fluid to be supplied is delivered to said inlet channel (2). 22. Method according to claim 21, characterized in that said machine (1000) is equipped with control means (100) comprising at least storage means (12) capable of storing, for a given liquid preparation, at least one parameter including at least the ratio between said total quantity of fluid to be supplied and said total quantity of liquid preparation to be delivered, and in that, for a given liquid preparation, manual calibration is carried out by actuating said pump (3) until obtaining the required quantity and quality of liquid preparation, and in that said storage means (12) are stored at each said at least one parameter relating to said given liquid preparation. 23. Method according to claim 21, characterized in that said metering device (500) is equipped with secondary weighing means (30) at the outlet of said machine (1000) for the continuous monitoring of the quantity of liquid preparation delivered , and in that said machine (1000) is fitted with control means (100) comprising at least storage means (12) capable of storing, for a given liquid preparation, at least one parameter of which at least the ratio between said total quantity of fluid to be supplied and said total quantity of liquid preparation to be delivered, and in that, for a given liquid preparation, an automatic calibration is carried out by controlling the operation of said pump (3) by said control means ( 100) until the required quantity of liquid preparation measured by said secondary weighing means is obtained, and in that said storage means (12) are stored at each said at least one parameter relating to said ite given liquid preparation. 24. Method according to claim 22 or 23, characterized in that, to obtain said given liquid preparation, said control means (100) are informed of the nature of said given liquid preparation and a cycle of manufacturing entirely managed by said control means.