IT202100001175U1 - "WEIGHTING AND CALIBRATION DEVICE FOR COFFEE GRINDER" - Google Patents

Description

WEIGHING AND CALIBRATION DEVICE FOR

COFFEE GRINDER

[0001] The present invention relates to a weighing and calibrating device for a coffee grinder-doser.

Field of application

[0002] The innovation finds application in the industrial sector of professional equipment for measuring weight. In particular, a weighing device is described which is able to weigh a coffee grinder-doser? into beans and instantly and automatically calibrate the dose of coffee? ground coffee dispensed by it.

[0003] Recently, the manufacturers of coffee machines? espresso for professional use have expressed the need? to automate said machines and the associated coffee grinder-dosers? in grains. This need? ? due to reasons of technological innovation, greater comfort? of use and, in particular, to always guarantee the highest quality? and uniformity? of service in the dose of coffee? cup extract. Indeed yes ? experimentally found that the secret to serving a coffee? optimal espresso? always keep the variable parameters that affect the recipe constant. Therefore, starting from the grinding of the beans, the manufacturers of grinder-dosers have tried to create machines capable of keeping the doses constant whatever the operating conditions; for example, some manufacturers have developed and marketed advanced devices which integrate particular weighing systems with electronic load cells and specific programs to keep said weight constant.

[0004] To this end, are prioritized solutions known? of weight where the ground powder is weighed directly inside a container or filter holder cup during dispensing, in such a way as to stop the motor when the measured weight reaches a pre-set value, which corresponds to the desired weight. Alternatively, are prioritized solutions known? of times in which the dose is weighed at the end of delivery and possibly the pre-set duration of motor operation is modified accordingly; essentially, these solutions envisage lengthening or reducing the grinding time in such a way that from the subsequent dispensing to the detection of the weight of the actually dispensed dose it is more? close to the weight value set as the optimal dose. Among them, are manual solutions known, substantially of the conventional type, or integrated solutions capable of carrying out these detections and modifications in a semi? automatic or even fully automatic, as detailed below.

[0005] The said priority grinding solutions? of times, which are equipped with an integrated or semi-integrated system able to carry out a continuous adjustment of the values set in the device to keep the delivered dose constant, otherwise called calibration or calibration, constitute in fact the advantageous technological evolution of a procedure already? well known to professional operators in this sector, who had the habit of occasionally checking the weight actually dispensed using a precision scale, on which they transferred the coffee powder ground corresponding to one or two doses just dispensed; they detected its weight value, or the relative grammage, and consequently performed approximate calculations to determine by how much to lengthen or reduce said pre-set grinding time. It should therefore be clarified that the present invention proposes an advantageous weighing device which makes said calibration automatic and instantaneous, for any grinder-doser apparatus of the electronically controlled type with priority? of times, where the grinding time set for a single or double dose? continuously modifiable on command of the weighing device itself, without any intervention by the operator, according to the purposes set out below.

[0006] From a technical point of view, electronic weighing devices of the platform type with horizontal bearing plane, otherwise known as digital or electronic scales, can be considered widely known, which integrate at least one electronic load cell connected to a horizontal plate corresponding to the said detection plan, and also integrate an electronic control card with unit? logic for managing said cell and the values detected by it. Generally, these weighing devices are equipped with a control panel with display for displaying the measured values, and electromechanical or touch-touch buttons for activating and/or setting the apparatus; this panel can? be integrated, as occurs in digital bench scales, or remote as occurs in certain industrial applications.

[0007] Furthermore, are professional type machines for preparing coffee known and widespread? espresso, conventionally called coffee machines, which in the extraction use particular filter holder cups, removable by coupling, being composed of a horizontal handle connected orthogonally to a cylindrical container with internal filter and external hooking flaps; must it be filled in advance with coffee powder? obtained by instant grinding of roasted beans or grains. This grinding, in particular, ? obtained by means of a specific machine called a grinder-doser or grinder-doser, which is fit to grind coffee? in grains and also dispense and dose it with precision. In fact, the aforementioned filter holder cup must be filled with the exact quantity of coffee powder according to the number of doses to be delivered, the quality? forecast and extraction needs. Nowadays, in professional use, single or double doses are foreseen in such a way as to simultaneously prepare one or two cups of coffee. expressed.

[0008] Generally, in a grinder-doser device, the coffee beans? they come by falling from a cone-shaped container placed above the main body of the machine, where the millstones and the motor are housed; they are then ground in such a way that the powder, reduced to microgranules, is correctly dispensed and collected inside said filter holder cup. In the professional field, conventional or automatic grinder-dosers are used, where the former have a gate-type lever switch which essentially leaves the user in control of how much and how to grind the coffee, while the latter are entirely managed by electronic and/or sensors that automatically control the delivery when such a threshold or duration is reached.

[0009] The latter, called electronic or electronically controlled grinder-dosers with priority? of times, or even instantaneous on -demand, are nowadays very common in the professional field since? they are stable, precise and have the advantage of limiting the operations to be performed by the operator who, sequentially, only has to position and/or hook said cup corresponding to the desired dose and then select this dose. Generally, the quantity desired coffee? related to one dose or or two doses? correlated in direct proportion to the duration of operation of the engine, which ? prefixed being previously set with the setting of the operating parameters of the appliance; in essence, these devices work a priority? of time and what? on the basis of the preset time of operation of the engine, that ? previously deemed suitable for dispensing the optimal dose in the desired weight or grammage.

[0010] How already? anticipated, ? well known to the operators of the sector the difficulty? to precisely adjust the said pre-set grinding time in order to obtain the exact quantity, by weight, of coffee? actually ground. Indeed yes ? experimentally found that the said weight of the dose obtained from time to time is not constant for the same? of set time, being variable according to multiple factors such as, for example, the chosen granulometry and the type of coffee? used, the wear of the machine, the changing environmental conditions including the humidity? and the temperature. The present invention intends to overcome these limitations, referring precisely to the aforesaid grinder-doser apparatuses of the electronic type where the grinding time is ? set with the initial setting of the appliance, and where the dose actually dispensed is from time to time slightly higher or lower than the desired weight, depending on the aforementioned parameters.

[0011] In most cases, nowadays, to compensate for these variations, a professional operator periodically intervenes on the setting of the appliance, manually modifying the duration of said operational grinding by progressive approximations in order to obtain the exact weight of coffee. ground and dispensed. This periodic adjustment operation, otherwise called dose calibration or calibration, ? generally performed by means of a bench scale of adequate precision, however encountering many difficulties? and disadvantages when such an operation has to be performed during daily professional practice. In particular, this operation of control and calibration of the grinder doser? not suitable when the preparation of coffee? espresso occurs with high frequencies and/or where ? request the highest quality? of extraction and service, with constancy and repeatability.

[0012] In principle, in fact, the conventional solutions for carrying out said calibration are based on the periodic control of the weight of the dose actually dispensed, with the subsequent adjustment of said pre-set grinding time by changing the setting of the grinder-doser. In particular, the system pi? simple and widespread in the professional field, it provides for the operator to manually weigh the ground product, in the manner of a periodic control sampling, using an electronic scale of sufficient precision. From an operational point of view, a container suitable for containing a single or double dose that has just been dispensed is positioned on the detection surface of said scale, in such a way as to evaluate its weight and any deviation from its nominal value, i.e. the desired optimal weight . Consequently, the operator modifies the setting of the grinder-doser by increasing or reducing the duration of the grinding, and this? the time set in its unit? control logic, based on a proportional or intuitive recalculation, by successive approximations.

[0013] The major producers of grinder-dosers have therefore proposed innovative solutions, capable of facilitating and/or eliminating these complex calibration operations, also by integrating a weighing device into the apparatus. Some solutions provide for said device to be a scale physically integrated in the body of the apparatus, in such a way as to always have a convenient detection plane available. Other solutions, more? advanced, they offer new high-complexity grinder-dosers constructive and often expensive, which structurally and functionally integrate a modern weighing device of the electronic type which is? directly connected to the unit? control logic of the apparatus in such a way as to modify its setting according to the weight values detected, in the manner of an automatic or semi-automatic calibration.

[0014] Apparatuses equipped with an integrated or semi-integrated weighing device are also known which ? adapted to progressively detect the weight of the ground product during dispensing, with the motor running. Basically, these solutions detect the weight of the product with its operating container, at the same time as dispensing, so as to stop grinding when the pre-set weight is reached. Generally, in such cases, the weighing device ? a horizontal pan scale on which to place said container, with single strain gauges or with a central load cell or ? of the type with lateral arm lever and load cell opposite to the container itself.

[0015] Yes? For? noted that the conventional and known solutions present certain problems. For example, the manual solutions based on picking and measuring the weight of one or more? disbursements ? sample, in order to calculate the corrections to be made to the setting of the equipment, are slow, awkward and even imprecise as multiple approximations are necessary before obtaining the desired result. In particular, yes? found in practice that the use of an external scale to calibrate the apparatus involves frequent interruptions and multiple occasions for error; Indeed, ? Is it known that these manual calibration operations of the parameters set in the grinder doser according to the dose actually dispensed, being preparatory to a correct preparation of the coffee? express, provide for separate and additional operations which slow down the ordinary professional exercise and distract the operator.

[0016] In general, yes? found that the conventional manual calibration solutions performed with a common bench scale are not suitable for modern grinder-dosers where the dispensed dose ? of a few grams, generally between 6.5 grams and 14 grams, specifically for the preparation of coffee Espresso using one cup or two cup portafilters. These manual calibration solutions with scales, on the other hand, are more suitable for calibrating smaller grinder-dosers. cheap and less precise, such as grocery appliances, being used to grind a quantity in a bag or container of coffee? much more large, generally between one hectogram and one kilogram.

[0017] Yes? also noted that the grinder-dosers pi? evolved, able to self-calibrate, involve an investment that is not? always justified from an economic point of view and/or imply the replacement of the device in use, which ? often an electromechanical device with high quality electronic control? and reliability?, still perfectly valid and functional, even if? without any device and/or calibration system.

[0018] On the other hand, with regard to the aforementioned solutions which integrate a weighing system capable of progressively detecting the weight of the ground product during dispensing, in real time and with the motor running, some problems have been encountered. For example, yes? noticed that to measure dynamically and accurately the weight variations in the disbursements of minimum quantities? of product? a very precise and sensitive device is required, for example an electronic load cell with strain gauges to the tenth of a gram. However, yes? found that such a device with high sensitivity? ? unsuitable if used during grinding, or with the powerful vibrations that the internal motor of the grinder-doser device transmits to the entire body of the machine, since? sometimes it makes the measured value of the individual weighings unreliable and also causes calibrations to the entire system. Furthermore, there is the problem of hooking a filter holder cup for espresso machines, which can? cause accidental impacts to the machine body and tends to unbalance the device designed to detect its weight, sometimes invalidating its detection with inaccurate and/or anomalous values.

[0019] Also, yes? found that the conventional solutions where an integrated device detects the weight of the dispensed dose in real time, during grinding, do not provide for calibration and do not perform any processing of the values detected for the purpose of calibrating the operating parameters; the said detection device ? instead used as a limit switch and cio? essentially acting as a switch which, when the pre-set weight is reached, cuts off the power supply to the motor to consequently stop the grinding. These solutions are often inaccurate since? remains a significant amount? of ground powder which is dispensed by inertia even after switching off, when the pre-set weight is reached.

[0020] For all the aforementioned reasons, in the professional field, in the preparation of coffee? espresso, electronic type grinder-dosers are mostly used where the grinding time ? prefixed, even if ? necessary the said calibration, or calibration of the fixed times, with a frequent modification of the settings in the apparatus. To this end, the invention proposes an advantageous weighing and calibration device configured as an external accessory not integrated with the grinder-doser, in the form of a bench scale able to weigh the entire apparatus and process information, particularly suitable for the widespread grinder-dosers electromechanical type with electronic control where the grinding time? predetermined, since they lack means and/or systems for said weighing and/or said calibration. For example, the found ? extremely useful and advantageous for making existing devices capable of dispensing doses that are always constant and exact, carrying out said calibration in them instantaneously and automatically, without operator intervention.

State of art

[0021] In order to determine the state of the art relating to the proposed solution? A conventional verification was carried out, interrogating public archives, which led to the identification of some precedents, including:

D1) EP20013460

D2) ES1154012

D3) D2 US6783089

D4) D3 US5386944

D5) EP2694216

D6) US5462236

D7) EP3097831

D8) EP3167782

D9 EP3560399

[0022] D1 describes a multipurpose appliance for the preparation of food, otherwise known as a food processor, which is equipped with a structurally integrated and removable ingredient weighing device, which communicates with said device in such a way as to display the measured values and allow the addition of the quantity? of a food, in order to progressively create a recipe.

[0023] D2 proposes a particular accessory for supporting and weighing a filter holder cup during extraction, in a coffee machine? express, which ? combined with a bench scale with horizontal detection plane that ? located near of said machine, facing its exterior, in such a way as to project said cup, positioning it under the extraction nozzle, to measure and display the effective weight of a dose.

[0024] D3 and D4 propose electronic weighing systems which are integrated constructively and electronically in a coffee grinder-doser? in such a way as to directly detect the weight of the dispensed product, including the operating container, and stop grinding when the pre-set weight is reached; the weighing device ? of the scale type with horizontal plate on which to place a container or a filter holder cup, or ? of the type with side arm lever.

[0025] D5 describes a grinder-doser equipped with a particular device for dosing and displaying the quantity exact coffee? ground and dispensed in a filter holder cup, which ? integrated and/or coupled frontally to the grinder-doser body, like an island; the device ? of the electronic type and ? adapted to support and weigh a filter holder cup, comprising a remote display to visualize the weight value detected. Now ? combined with a particular filter holder designed to communicate with the device itself, being equipped with buttons with a digital interface for the user.

[0026] D6 proposes a grinder-doser capable of calculating the weight of the desired dose as a function of the grinding time in such a way that the operator, via an electronic calibration circuit interfaced with the unit, control logic of the grinder doser, manually enter the weight of the dose actually ground in order to correct the setting.

[0027] Q7 discloses an electronic grinder-doser device for coffee? equipped with an electronic weighing device with load cell directly connected to the unit? control logic of the appliance, partially integrated and joined to the body of the appliance, which allows the professional operator to measure and calibrate the weight of the dose based on the quantity? of product actually ground and dispensed, through a semi-automatic adjustment procedure to be performed separately from ordinary operation, which provides for: interruption of ordinary operation and cio? of the normal dispensing service, manual collection and weighing of multiple samples, calculation of the new grinding times according to a particular algorithm, automatic setting of the said unit? logic, resumption of ordinary operation with the new grinding times.

[0028] D8 proposes a continuous and automatic dose calibration procedure for an electronic type grinder-doser device which integrates a weighing device inside, where at the end of dispensing a load cell detects the weight of the dose actually dispensed to recalculate consequently the correct duration of grinding; the said load cell ? with horizontal loading surface and ? positioned in the base in such a way as to weigh the body of the appliance, or ? integrated below the cone that contains the coffee beans, in such a way as to progressively detect the drop in weight. The proposed procedure? performed continuously for cycles during ordinary exercise and without interruptions, adapting the grinding times in such a way as to get as close as possible to the grinding process. possible at the desired weight; after a preliminary phase of setting the desired weights and provisional grinding times, the procedure envisages continuously repeated automatic calibration cycles, each of which with three sequential phases: a first phase of automatic control of dispensing with progressive measurements of the weight , a second phase of automatic processing to determine the correct grinding times, a consequent third phase of automatic regulation of the appliance.

[0029] D9 describes a method of instantaneous self-calibration of the coffee dose, for a particular electronically controlled grinder-doser which integrates a weighing means and a particle size adjustment means, with a warning microswitch. The method provides for: a first setting of the nominal dose with provisional grinding times; a second setting of the fields of tolerance and reliability? of the doses dispensed, for the purpose of recalculation; automatic control of the weight of each dose actually dispensed; the automatic recalculation of the grinding times with different calculation logics; automatic calibration of the device according to the recalculated times.

Drawbacks

[0030] All the solutions described above imply the use of a weighing device to measure the exact quantity of a food product, for the purposes of its correct use. Each specific application, however, has certain limits when considered for the purposes of the present invention. For example, can you consider it known and conventional to integrate a means of weighing in a food processor, as in D1 for adding ingredients, or in another appliance for processing food including coffee? in grains, as in D3 and D4 to deactivate the motor when a pre-set weight value is reached; these solutions, however, provide for the integration of the weighing means in a specially structured apparatus, with completely different purposes and with already existing disadvantages. exposed. Furthermore, known integrated solutions can be considered to facilitate the calibration of a grinder doser with priority? of times, of which for example D6 and D7, by manually adjusting the pre-set grinding time after periodic sampling with service interruption. The best solutions evolutions of automatic adjustment of the grinding time, referred to in D8 and D9, oblige instead to invest in a new grinder-doser apparatus specifically configured for this purpose; such a case, moreover, pu? involve the possible replacement and/or disposal of the device already? in use, how often ? fully functional from the point of view of mechanics and grinding, but not ? equipped with its own calibration system, such as ? instead nowadays required in the professional field. Yes ? further noted that D8 does not integrate a support and/or hooking means for a conventional filter holder cup for coffee machines, being suitable for large containers placed on the counter or external hooking means of said cup.

[0031] In principle, in fact, do all the solutions described above intend to overcome the known difficulty? that the professional operator encounters every day in obtaining from a grinder-doser the exact quantity? of coffee? ground and/or the exact dose extracted in the cup. However, do they have purposes and methods? applications different from the present invention. Also the known use of a scale for detecting the doses dispensed and consequent calibration of the grinder doser has the known disadvantages of imprecision, interruptions in ordinary operation, additional time and attention required of the operator. In particular, all the known solutions which provide devices for detecting the weight physically separated from the grinder-doser apparatus are not suitable for any grinder-doser apparatus of the electronically controlled type with pre-set grinding times, new or possibly already existing. existing and/or used, to make it able to calibrate itself automatically and instantly, without operator intervention.

[0032] Basically, yes? noted that the automatic or semi-automatic calibration solutions of a grinder-doser device provide for a structural and functional integration of the weighing means, in a specifically configured device. Instead, the solutions conventionally used to calibrate the existing grinder-dosers devices, using a common bench scale detached from the device, provide for the collection and measurement of the weight of one or more? dispensing - sample in order to calculate the corrections to be made to the appliance setting; these operations are slow, awkward and also imprecise since multiple approximations are necessary before obtaining the desired result. Furthermore, using a bench scale or a specific island device for said manual samplings, ? it is necessary to pay great attention and delicacy in handling, placing and/or hooking and/or continuously removing a heavy container with an asymmetrical and protruding shape, with a considerably higher tare weight than the content, as happens with a metal filter holder cup where the contained dose ? equal to a few grams, of which for example in D5; such a manual solution pu? be inaccurate and pu? involve shocks that stand the said load cell, which ? extremely sensitive, so ? unsuitable for professional use for the purposes of the invention.

[0033] All of that? considered, ? reasonable the need? of companies in the sector to identify innovative solutions capable of overcoming at least the problems just identified. In particular, an effective weighing device capable of automatically and instantaneously weighing and calibrating an existing grinder-doser device is not known, although nowadays it is desirable in professional use, which is? electronically controlled with pre-set grinding times, said device being separated from said apparatus like an external accessory; said accessory, being able to carry out an automatic and instantaneous calibration of the device, auto ? calibrating the single or double dose with high precision. Basically, right? known and ? An accessory that operates continuously in complete autonomy during ordinary operation is desirable to instantly re-calibrate the grinding duration parameters according to the doses actually dispensed, to get as close as possible to the grinding time. possible to the desired weight in any operating condition, without wasting coffee? or work and without quality supplies? inadequate.

Summary of the invention

[0034] These and other objects are achieved with the present innovation according to the characteristics set forth in the appended claims, by solving the problems described by means of a weighing device (10a, 10b) for a coffee grinder-doser (20a, 20b) in grains; the proposed device (10a, 10b) ? configured as an external accessory, like an electronic scale separated from the grinder-doser device, which allows the weight of the dispensed doses to be automatically and instantly calibrated, recalculating and modifying the pre-set grinding time in the settings of said grinder-doser device when said weight deviates excessively from the desired value.

Purposes

[0035] In this way, through the considerable creative contribution the effect of which constitutes an immediate and not negligible technical progress, various and notable aims are achieved.

[0036] A first purpose? Was it to make an accessory for coffee grinder-dosers available? which guarantees automatic and instantaneous calibration, without interruptions in operation and/or manual intervention by the operator. The proposed accessory allows to operate continuously according to correct grinding times and to obtain single or double doses of always optimal and constant weight. Pi? in detail, the proposed accessory? an electronically controlled thin weighing device, configured in such a way as to be positioned below a grinder-doser apparatus to detect the drop in weight thereof at the end of the grinding process; it ? therefore equipped with specific calibration programs, of the software type with algorithms and calculation logics suitable for processing the values detected from time to time and consequently recalculating the grinding times corresponding to the optimal pre-set dose. Furthermore, the proposed weighing device ? also equipped with communication means which connect it to the electronic control card of said grinder-doser, so as to carry out said calibration. Therefore, the professional operator is allowed to automatically keep the weight and therefore the quality constant. final of the coffee? espresso served in the cup to the customer, limiting the influences caused by the aforementioned variables besides the state of conservation of the beans, the state of maintenance of the machine, the grinders used and/or the environmental conditions.

[0037] A second purpose? been to create a weighing device that ? physically separated from the grinder-doser device in the guise of an extremely versatile external accessory, as thin as a support plate and suitable for any electronically controlled grinder-doser device, even those already in operation. existing and/or used, both of the bench type complete with fairing and display, and of the more? essential as a remote controlled grinding group. The proposed device? therefore capable of autonomously weighing and calibrating the device positioned on its detection plane, making it instantly capable of self-calibrating according to the weight values detected from time to time, according to a feedback logic where the said accessory orders the grinder to set the new dose dispensing times. Basically, with the proposed device you get the same effect as modern integrated appliances, more? evolved, complex and expensive, which already? incorporate means and systems for weighing and calibrating the doses delivered.

[0038] A third purpose? was to eliminate any intervention on the device by the operator, with the exception of connections and initial settings, significantly reducing the opportunities for distraction, fatigue or human error during daily professional practice. The said initial settings are limited, for example, to the optimal weight required and, possibly, to some customized parameters to be considered in the recalculation of the grinding times.

[0039] A fourth purpose, consequent to the previous ones, is was to eliminate the conventional periodic service interruptions which are necessary to carry out said calibration separately from ordinary operation, as instead happens according to known systems where a conventional bench scale is used manually. In addition, the costs associated with time and/or sampling involved in such operations are eliminated.

[0040] A fifth object of the invention? was to make available a weighing device specifically configured for the grinder-dosers appliances more? widespread in combination with the well-known bar machines for the extraction of coffee? espresso, who therefore use filter holder cups for coffee? expressed. Does the proposed device include at least one highly sensitive load cell? and stability operational, which detects the weight loss of the appliance only with the engine stopped and without the said filter holder cup, which does not insist on the said cell since? ? independent from the detection being advantageously constrained to a front coupling fork which ? joined to the basic structure of the device, below the cell, in the form of a shaped protrusion; such a solution allows the device to exactly detect said drop in weight of the appliance and also preserves said cell from shocks and/or unbalance, for greater reliability? of the detections and for a constant stability? of dispensing.

[0041] The proposed weighing and calibration device, therefore, offers at the same time the not negligible advantage of reducing the doses that the grinder doser dispenses with weights out of tolerance, even following substantial modifications of the millstones, the granulometry or other surrounding conditions, progressively self-regulating with the practical effect of improving the quality? of the service and also to significantly facilitate and speed up the daily professional practice. Consequently, is it possible to reduce the waste of coffee? disbursed unnecessarily; more in general, a not negligible economic saving is obtained, also due to the reduction of the time wasted for the purposes of said checks and calibrations.

[0042] Furthermore, an economic, precise and reliable weighing and calibration device is available which is not bulky, easy to install and use, which allows to obtain the continuous delivery of single and double doses having a weight always close to the value optimal desired, avoiding investments in new appliances pi? advanced systems that integrate their own weighing and calibration systems, with considerable cost savings and with an immediate technological renewal of existing and/or used appliances, still validly functioning, avoiding useless waste.

[0043] These and other advantages will appear from the subsequent detailed description of the preferred embodiment of the invention, with the help of the attached drawings.

Drawing content

Figure 1 ? a lateral schematic representation of the device for weighing and calibrating the dose of coffee? ground what? proposed by the present invention, represented with a coffee grinder resting on the weight detection plate and in conditions of ordinary use, where the coffee dispensing duct? ground ? in correspondence with a hooking or support fork, for a filter holder cup, integrated in the basic structure of the device. Particularly, in this figure the device object of the invention ? in its preferential configuration, complete with a control panel and with specific calibration programs integrated in its electronic management card so as to weigh and calibrate a coffee grinder-doser? of the electromechanical type with electronic control. The grinder? instead configured as an essential appliance without a control panel and aesthetic fairing, in the manner of a conventional, compact and economical, fully remote controlled grinding group, for professional use in combination with a coffee machine. In order to make the image easier to understand, said device and the grinder doser are sectioned along the vertical center line, the filter holder bowl ? view orthogonally from the side while the control panel ? also represented frontally.

Figure 2 represents the same components as in the previous figure 1, where the said calibration programs are instead installed in the electronic control card of the grinder-doser in such a way as to modify directly inside its unit? logic the grinding times just recalculated.

Figure 3 represents an alternative configuration with respect to said figure 1, equivalent for the purposes of the invention, where the weighing and calibration device ? without said control panel, being suitable for a grinder-doser complete with its own control panel and a shaped body, acting as an aesthetic fairing, as occurs in modern professional bar appliances which are positioned visible on the counter at a short distance from a coffee machine? expressed. In order to facilitate the understanding of the image, under the body? schematically highlighted the size of the motor and grinders and the electronic card; the display ? also represented frontally. In general, the invention pu? be applied as an external accessory to the grinder-dosers available on the market of the type called instantaneous and electronic on-demand, where the grinding times are pre ? set and modifiable in the setting. By way of example only, in the figure ? represented an electronic coffee grinder of the company? Italian Fiorenzato M.C. Srl, S. Maria di Sala VE ? www.fiorenzato.com, commercially known under the name F83E and belonging to the aforementioned type of instant on - demand grinder dosers with priority? of times, which ? without its own weighing and/or dose calibration device.

Practical execution of the invention

[0044] With reference also to the figures (Figs. 1 ? 3), the present innovation refers to an advantageous device for weighing and calibrating the dose (10a, 10b), for a coffee grinder doser (20a, 20b). in grains of the said electronic and instantaneous type on ? demand, a priority? of times, which device (10a, 10b) ? from it (20a, 20b) distinct and separated in the manner of an external accessory particularly shaped according to the purposes of the invention, as explained below.

[0045] The proposed device (10a, 10b) ? substantially configured as a thin digital scale with a horizontal detection plane, able to be positioned under said grinder-doser (20a, 20b) in such a way that it rests and insists only on the detection plate (103) to detect each time the exact drop in weight, at the end of each dispensing. The device (10a, 10b), furthermore, comprises means for managing and processing the detected data (104, 105, 110) and means for transmitting information and commands (105, 120) to the grinder-doser (205) in such a way as to automatically calibrate it, consequently and according to the surveys carried out, the pre-set grinding time (Ts, Td) and that is? the duration of operation of the motor and grinders (201, 202, 205) which determines the basis weight, or weight value, of the dispensed doses (Ps, Pd). Advantageously, it is foreseen that each dose is directly dispensed inside a filter holder cup (30) for coffee machines, which is released from the grinder-doser being linked to the proposed device (10a, 10b, 102) independently of the weighing, and that is? without insisting on its active means of detecting weight loss (103, 104, 105).

[0046] The device (10a, 10b) object of the invention ? therefore an accessory adapted to automatically and instantaneously weigh and calibrate a grinder-doser (20a, 20b) of the electromechanical type with electronic control where the grinding times are pre-set and the settings can be modified. This coffee grinder? widespread in the professional field and comprises at least: a motor (201) directly connected to two opposing grinders (202), a frontal dispensing duct (203), a container for the coffee beans (204) placed in the upper part of the appliance and an electronic control card (205) of the motor. Furthermore, the said coffee grinder can? whether or not to incorporate a control panel for the settings and operation of the motor, being it integrated or remote.

[0047] More in detail of said panel, in a first variant (20a) (Figs. 1, 2), said grinder-doser ? an essential appliance without its own control panel and without a particular shaped body, as occurs in a remote-controlled grinding unit; advantageously, in this case (20a), its control can? be performed by means of a control panel (106) incorporated in the proposed device (10a), since it (106) is suitable for operating and setting said grinder. In a second variant (20b) (Fig. 3), equivalent from a functional point of view and for the effect obtained, said grinder-doser ? an appliance complete with a shaped body (209), otherwise known as an aesthetic fairing, which integrates its own control panel (206), for example with a display (207) and touch-sensitive buttons (208), as happens in modern bar grinders which are generally positioned on the counter a short distance from a coffee machine? expressed. In this case (20b), the device proposed by the invention (10b) can be devoid of its own control panel, as described below.

[0048] More in the technical detail of the proposed device (10a, 10b), it ? an electronic type scale composed of: a base structure (101) integrally joined to a fork (102) which protrudes frontally to support and/or hook a conventional filter holder cup (30) for coffee machines? expressed, at least one load cell (104) of the type with horizontal loading surface which ? placed above said basic structure (101) and ? joined to a sensing plate (103) placed horizontally above said cell (104) as a loading platform; Furthermore, ? including an electronic management board (105) of the cell with relative unit? logic and means of power supply. Said sensing plate (103) ? adapted to support and weigh said grinder-doser (20a, 20b), in the conditions of ordinary use where the grinder-doser ? positioned stably on it with the dispensing duct (203) arranged frontally, exactly in correspondence with said fork (102) so that the coffee powder ground and dispensed collects by falling into the filter holder cup (30) leaning and/or hooked to it (101, 102). The load cell (104, 105), after each grinding cycle and with the motor (201) stopped, automatically detects the drop in weight of the grinder-doser (20a, 20b, 103) which corresponds exactly to the dose of coffee? That ? from time to time actually ground and dispensed (Ps, Pd, 203, 30) outside the grinder-doser device, in said filter holder cup, which ? advantageously constrained to the weighing device (10a, 10b) and not to the coffee grinder (20a, 20b), in order to be independent of the weighing, since said fork (102) is joined to the base structure (101) below the load cell (104 ) (Figs. 1, 2, 3).

[0049] The proposed weighing device integrates at least one high precision load cell (104), such as for example a point load cell conventionally called single point load cell in English, which ? suitable for detecting exactly a weight between 0 and 20 grams by measuring the variations to the hundredth of a gram. Said load cell (104) makes immediately available to the unit? logic integrated in said electronic management card (105), at the end of the supply and cio? with the engine stopped to ensure maximum stability? and reliability? detection, at least the exact value of the weighing in hundredths of a gram. The cell (104) ? powered by its own power transformer directly controlled by the said unit? logic. By way of example, ? Is a cell of the type marketed by the company suitable for the invention? German Siemens under the name Siwarex R Load Cells ? Sp Series ? in the customized configuration for weights lower than 0.1 kg and detections to the hundredth of a gram. In the present invention it is described, for simplicity? descriptive and constructive, a weighing and calibration device (10a, 10b) comprising a single cell (104) (Figs. 1, 2, 3); However, ? equally foreseen the use of multiple cells if there? allows you to increase the quality of the surveys or in the case of a particular construction and/or application configuration and/or for large grinder-dosers; by way of non-limiting example, ? sometimes it adapts a pair of identical cells powered by the same transformer.

[0050] To perform said calibration of the grinder doser automatically and instantaneously, according to the purposes of the invention, the weighing device (10a, 10b, 105) is associated with calibration programs (110) of the software type with algorithms and calculation logics , which process the weight values (Ps, Pd) detected from time to time (103, 104, 105) and consequently immediately recalculate the grinding times (Ts, Td) corresponding to the pre-set optimal dose (Ds, Dd). The said recalculation, therefore, ? performed according to the weight values detected from time to time (103, 104, 105, Ps, Pd) and occurs only when they are outside a pre-set tolerance field.

[0051] In the preferred embodiment (Figs. 1, 3), said calibration programs (110) are installed in the electronic management card (105) of the device itself (10a, 10b); alternatively (Fig. 2), they (110) can be installed in the electronic control card (205) of the grinder-doser to be calibrated, said card being in any case connected to the card of the proposed device (105, 120), according to the purposes of the invention. It should be noted that such a solution implies an update and/or modification of the programs pre-installed on said board of the grinder-doser; this configuration, in some cases pu? simplify the execution of the changes in the settings for the purpose of the calibration since? an order processed and issued within the same device is executed. Further, ? It is possible to obtain the same result with remote calibration programs (110), alternatively residing in an external electronic device, such as a mobile phone, or in the Internet network, as happens for example in the so-called cloud systems. However, ? it is known that with programs (110) residing in at least one of said electronic cards (105, 205) any problems of access and/or connection to a remote system or external server are eliminated.

[0052] Furthermore, to allow the necessary exchange of information and commands between the proposed device (10a, 10b) and the grinder-doser to be calibrated (20a, 20b), according to the purposes of the invention, two-way communication means (120) are provided between the cell management electronic board (104, 105) and the motor control electronic board (20a, 20b, 201, 205), capable of transmitting and/or receiving information and commands in relation to said weight values detected by the cell (104, 105, Ps, Pd). By way of non-limiting example, a direct connection via cable is envisaged, not shown in the figures, with USB-type standards for communication and power supply. Alternatively, a wireless type connection is envisaged, where components (121a, 121b) are installed in both boards (105, 205) matched to each other and capable of transmitting and receiving said information or commands (Figs. 1, 2) ; in particular, ? suitable for the invention is a wireless connection of the direct type, with Bluetooth technology, or of the indirect type on the Internet with Wi-Fi technology.

[0053] Therefore, it is envisaged that at least one control panel (106, 206) is associated with said weighing and calibration device for displaying data or information, such as the measured weight values, and also for setting, in particular, at least two groups of basic values for the said recalculation:

? the fixed weight values of the optimal single (Ds) or double (Dd) dose, in such a way as to associate the corresponding provisional grinding times (Ts, Td);

? a tolerance range of the values detected, for said single dose and the double dose. In addition ? It is advisable to also set a field of trust?, as shown below.

[0054] To this end, a versatile solution is proposed, where the weighing and calibration device (10a, 10b) ? in two constructive variants (10a, 10b) which are substantially equivalent from the point of view of functionality and the effect obtained. In a first variant (10a) (Figs. 1, 2), said control panel (106), of the type with display (107) with buttons (108), ? frontally incorporated in the base structure (101) below said fork (102) and ? directly connected to the management card (105) of the load cell (104); this solution ? particularly suitable for controlling (105, 106, 120) and calibrating (104, 110, 120) a remote controlled essential grinder-doser (20a), without its own control panel as explained above, where said panel (106) ? to operate the cell (104, 105), display the measured and/or recalculated values (110), and also to operate the motor (201, 205) of the grinder-doser (20a) and set the weight values of said pre-set optimal doses ( Ds, Dd). In a second variant (Fig. 3), the proposed device (10b) uses a remote control panel, detached from said base structure (101), being the same control panel (206) integrated in the grinder-doser (20b), also of the type with display (207) and buttons (208), which ? directly connected to said electronic control board (205) of the motor (201) and also ? in communication (120) with the electronic management board (105) of the cell (104).

[0055] It is clarified that in order to complete said automatic and instantaneous calibration of the delivered dose, immediately after having recalculated the new grinding times, ? the weighing and calibration device (10a, 10b, 105, 110, 120) which imparts to the electronic control card of the grinder-doser (20a, 20b, 205) the modification order of the aforesaid times, as they are pre-set therein in the setting. Basically, the grinding times (Ts, Td) are considered provisional and can be modified continuously according to the weight values actually detected (Ps, Pd) by the proposed device (10a, 10b).

[0056] More in detail of said calibration programs (110), they first provide for the processing of the values detected, then the recalculation of the grinding times (Ts, Td) and finally the modification of the settings, based on the following values pre-set by the operator (106 , 206) for reference:

? an optimal grammage of the dose, i.e. the nominal weight value of a single dose (Ds) and of a double dose (Dd) to which the respective grinding times (Ts, Td) are provisionally associated;

? a field of tolerance of the values in weight detected from time to time (Ps, Pd), with respect to the said nominal values (Ds, Dd), where are the permitted values or the doses considered compliant for which they are not? no recalculation expected;

? a field of trust? of the weight values detected from time to time (Ps, Pd), with respect to the said nominal values (Ds, Dd), where are the values of the non-compliant doses and which are considered realistic and reliable for the purposes of said automatic recalculation of the times of grind (Ts, Td); said field of reliability?, defined by an upper limit and a lower limit of? reliability? in addition to which there are anomalous or unrealistic values, which are not considered for the purposes of said recalculation as they are caused by an executive or functional anomaly of the grinder-doser apparatus (20a, 20b).

[0057] Advantageously, in said recalculation of the grinding times (Ts, Td), it is envisaged that said calibration programs (110) only consider the reliable values, ie? external to said tolerance field but internal to said reliability field. Then, the grinder-doser (20a, 20b) is calibrated (105, 110) by means of its control card (205), modifying in it the grinding times (Ts, Td) just recalculated, in the form of a retraction.

[0058] Furthermore, it is envisaged that said calibration programs (110) carry out said processing of the detected weight values (Ps, Pd) and said recalculation of the grinding times (Ts, Td) according to two operating logics which are alternatives to each other. A first logic? called ordinary logic, being performed during the ordinary use of the grinder (20a, 20b) in the manner of a predefined operating mode, where only the detected values (Ps, Pd) which are outside said range of tolerance and included in the said field of reliability, from time to time only positively or only negatively. Alternatively, a second logic called forced logic is envisaged, which temporarily interrupts said ordinary logic when an adjustment of the granulometry and/or grinders changes, so as to immediately calibrate the grinder-doser (20a, 20b) according to said changes and then restart with an updated ordinary logic; in this case, first at least one undetected purge delivery is performed (104, 105) and then at least one? sample whose weight value ? considered for the purposes of the aforementioned recalculation (Ts, Td).

[0059] The invention offers the operator the possibility to customize some recalculation parameters, such as the number of out-of-tolerance values to be considered in the recalculation and/or the method used. For example, for the purposes of the invention, with the said ordinary logic ? a setting of the device (10a, 10b) is effective where the said calibration programs (110) start the recalculation of the grinding times as soon as (104, 105) three single doses (Ps) or three double doses (Pd) are detected consecutively all out of tolerance and all within the said field of reliability, positively or negatively. Then, ? Is it possible to obtain from their average a constant of effective delivery from which the new grinding times (Ts, Td) are obtained, in the guise of a proportionality? direct exemplified below.

[0060] When the device (10a, 10b) detects (103, 104, 105) a weight value (Ps, Pd) outside said range of reliability, being unreliable in the form of an anomalous dose, the said programs (110) implement a temporary suspension of the recalculation (Ts, Td) in such a way as to verify if the anomaly persists, in which case measures must be taken to resolve it, or ? an occasional and negligible abnormal dose. If said anomalous values persist, an alarm indication is expected to be made visible by the operator, while in the opposite case, or with occasional anomalies, said recalculation resumes without notifying the operator.

[0061] Therefore, from an operational point of view, an operator who uses a grinder-doser (20a, 20b) can advantageously position it resting on the sensing plate (103) of the proposed device (10a, 10b, 110, 120); to make it (20a, 20b) automatically and instantaneously calibrated, according to the purposes of the invention, at startup? necessary a first setting performed by means of said control panel (10a, 106) (10b, 206), relating to the desired basis weight or the nominal value in weight corresponding to the optimal single (Ds) and double (Dd) dose; to her ? provisionally associated with a corresponding grinding time (Ts, Td). Then, for the purposes of the recalculation (110), the operator performs a second setting relating to a tolerance field for the weight values detected by the load cell with respect to said set nominal value, and at the same time also sets a reliability field? deviated or out of tolerance values. Basically, it is foreseen to define an upper limit and a lower limit for the reliability? of the measured values; in this way an intermediate field is defined between tolerance and anomaly, which ? partly positive and partly negative since there is a?reliability? positive above the permitted tolerance but ? less than or equal to the maximum reliable value, while the? reliability? negative ? below the permitted tolerance but ? greater than or equal to the minimum reliable value.

[0062] Merely by way of example, in the initial setting a nominal or optimal weight is set for the single dose (Ds) equal to 7.5 grams and for the double dose (Dd) equal to 14 grams, and then set the said tolerance and reliability fields, the respective limit values being progressively represented below, in grams:

? single dose:

<(3,8) | 3.9 - 7.3 | 7.4 - 7.6 | 7.7 - 13.4 | (13.5)>

? double dose:

<(7,0) | 7.1 - 13.6 | 13.7 - 14.3 | 14.4 - 19.8 | (19.9)>

where, to facilitate understanding, ? here the tolerance range is indicated centrally in bold, with the permitted values between 7.4g and 7.6g for the single dose and between 13.7g and 14.3g for the double dose, and where the values are indicated in brackets which presumably correspond to an operating or functional anomaly, while the intermediate values corresponding to said field of reliability are underlined, positively and negatively with respect to the admitted values. These out-of-tolerance values are considered in said recalculation of the grinding times, being respectively between 7.7 and 13.4 and between 3.9 and 7.3 for the single dose, and between 14.4 and 19.8 and 7.1 and 13.6 for the double. In the preferential setting of said calibration programs (110), these out-of-tolerance and reliable values are taken into consideration every time they occur three consecutive times in the same intermediate range, only positive or only negative, for the single or double dose. This setting can eventually be modified by the operator to meet particular calculation needs.

[0063] Once the aforementioned values have been set ? limit, the proposed device (10a, 10b) carries out the detection (103, 104, 105) of the weight drop of the grinder doser automatically, after each dispensing with the motor stopped, without operator intervention, obtaining the actual weight d? each dose delivered (Ps, Pd). Then, it (10a, 10b, 110) carries out the automatic recalculation (104) of the grinding times (Ts, Td), which advantageously takes place, in an ordinary operating logic, considering the average of the weights detected and the effective dispensing constant for obtain the new times proportionally, or it occurs exceptionally in a forced operating logic when a substantial variation of the surrounding conditions is felt which certainly makes the grinding times used at that moment inadequate. For example, for the purposes of the invention, are substantial events a variation of the granulometry, or of the coffee? used, or of the millstones mounted; in particular, ? known that with flat millstones ? suitable a recalculation performed with proportionality? direct between the single and double dose, while with conical grinders ? a recalculation carried out separately from time to time is preferable.

Finally, the proposed device arranges said automatic regulation of the apparatus according to the grinding times just recalculated.

[0064] Merely by way of non-limiting example, in order to facilitate understanding of the invention, a practical case of use and recalculation of the grinding times is reported below where the weighing and calibration device (10a, 10b, 110 ) ? designed to recalculate times with continuous operating logic, proportionality? direct between doses and number three values deviated by the same sign with respect to the optimal weight value (Ds, Dd) or desired grammage. In a first setting, the said optimal values are determined for each dose:

? (Ds) nominal single dose: weight equal to 7.5g, with provisional dispensing time (Ts) equal to 2sec;

? (Dd) double nominal dose: weight equal to 14g with provisional dispensing time (Td) equal to 3.7sec.

Then you set the above values? limit of these tolerance and reliability fields, as in the example above. At this point the weighing and calibration device (10a, 10b) operates continuously in complete autonomy, without operator intervention, carrying out said readings (103, 104, 105) at the end of each dispensing. Therefore, according to the said arrangement, as soon as three single doses actually dispensed, consecutive, out of tolerance and reliable (102), for example Ds1 = 4.1g, Ds2 = 4.2g, Ds3 = 4.1g, the said calibration (10a, 10b, 110) intervene and automatically start the recalculation and modification of the dose dispensing time, relating a dispensing constant of the doses actually dispensed to the desired nominal weight:

? calculation of the average of the weights detected: 4.1+ 4.2 4.1 = 12.4 / 3 = 4.1g

? calculation of the effective delivery constant: Ts / average weights = 2 sec / 4.1 g = 0.48

By providing, for example, a direct ratio of 1 to 2 in the automatic recalculation of the time necessary to obtain single and double doses, the same dispensing constant is used to determine the double dose:

? new grinding time (Ts) to be associated with the single dose = constant dispensing * optimal weight (Ds) = 0.48 * 7.5 g = 3.6 sec.

? new grinding time (Td) to be associated with the double dose = constant dispensing * optimal weight (Dd) = 0.48 * 14 g = 6.7 sec.

[0065] Such an example allows us to appreciate the versatility and comfort? of use of the proposed device (10a, 10b), being extremely quick and easy to set and/or parameterize said calibration programs (110) as desired. In particular, it is noted that once positioned, connected and set (102, 104, 110, 120), the advantageous weighing and calibration device (10a, 10b) operates in complete autonomy and takes up minimal space on the worktop work being thin and slightly larger than a commonly used professional coffee grinder, in the form of a basic platform.

[0066] In conclusion, with the weighing and calibration device (10a, 10b) provided by the invention (Figs. 1, 2, 3) it is possible to automatically and instantaneously calibrate an electronically controlled grinder-doser (20a, 20b) where the grinding times are pre-set and modifiable, being of the type widely known and widespread in the professional field, solving the problems encountered in the known solutions and achieving the foreseen purposes. In particular, yes? found in daily professional practice that said weighing and calibration device (10a, 10b) significantly facilitates the work of an operator, with less physical and mental fatigue, thus arranging of a grinder doser constantly calibrated or calibrated in such a way as to maximize the quality? of the service offered and obtain with precision and constancy, the exact desired weight of the coffee dose? ground and dispensed, considering the multiple variables involved.

Legend

(10a, 10b) device for weighing and calibrating the dose, for a coffee grinder-doser, according to the present invention. In a first variant (10a) it ? a device complete with the control panel, like a digital scale which integrates the display and buttons, while in a second variant (10b) it is? an essential device, for the purposes of the invention, without said panel;

(101) basic structure of the weighing device;

(102) hooking or support fork, integrated and integral with the base structure, for hooking a filter holder cup for coffee machines?;

(103) sensing plate, to place a coffee grinder-doser on it;

(104) load cell, of the type with detection on a horizontal load surface;

(105) cell management electronic board, unit type? logic;

(106) control panel, for operating the grinder and for the settings;

(107) displays;

(108) buttons;

(110) calibration programs, of the software type with algorithms for calculating the measured values and with control logics to activate the adjustment of the grinding times in the grinder-doser in such a way as to obtain automatic and instantaneous calibration of the dose according to the weight effectively detected at each grinding cycle, with the engine stopped;

(120) means of communication, of the bidirectional type for transmitting and/or receiving information and/or commands;

(121a, 121b) electronic components for transmitting and/or receiving information and/or commands in mode? wireless, respectively mounted on the electronic board of the cell (121a) and of the grinder doser (121b).

(20a, 20b) grinder-doser, of the electromechanical type with electronic control with pre-set and modifiable grinding times, where in a first variant (20a) ? an essential appliance without the control panel and fairing, like a remote-controlled grinding group, while in a second variant (20b) ? a device complete with said panel and fairing, in the manner of a modern coffee grinder-doser.

(201) grinder motor;

(202) millstones;

(203) dispensing duct or coffee outlet? ground into powder, directed to be collected in a filter holder cup; (204) coffee container? in grains;

(205) motor control circuit board;

(206) control panel, at least for setting and operating the motor;

(207) displays;

(208) buttons, of the electromechanical or touch type or equivalent;

(209) shaped body or fairing;

(30) filter holder cup for coffee machines?;

(Ds, Dd) value by weight of the desired dose of coffee, pre-set as the optimal reference value, respectively in single and double dose;

(Ps, Pd) value by weight of the dose of coffee? actually ground and dispensed by the grinder, respectively in a single and double dose;

(Ts, Td) grinding time, understood as the duration of the motor running, respectively corresponding to a single or double dose.

Claims (13)

1. A device for weighing and calibrating the dose (10a, 10b), for a coffee grinder (20a, 20b), which automatically calibrates in it (20a, 20b) the pre-set grinding time (Ts, Td), i.e. ? the duration of operation of your motor which corresponds to the basis weight or weight of the dose which ? dispensed from time to time (Ps, Pd) inside a filter holder cup (30) for coffee machines?; said weighing and calibration device (10a, 10b), to make the dispensed dose (Ps, Pd) constant at each grinding cycle and corresponding to a pre-set dose (Ds, Dt) as the optimal value, where said grinding time ( Ts, Td) ? the setting can be modified from time to time to approach said optimal weight values, like a calibration; said doses, being single (Ds, Ps) or double (Dd, Pd) in relation, respectively, to a single (Ts) or double (Td) grinding time; and where the said weighing and calibration device (10a, 10b) ? of the electronic type with weight detection on a horizontal plane, and ? for weighing and calibrating a grinder-doser (20a, 20b) of the electromechanical type with electronic control comprising: a motor (201), two opposing grinders (202), a dispensing duct (203), a container for the coffee beans? (204), an electronic control card (205) of said motor; and where is said filter holder cup (30) ? independent of the weighing being released from the means for detecting the weight and also released from said grinder-doser (20a, 20b); said weighing and calibration device (10a, 10b), characterized by the fact that ? an electronic scale separated from said grinder-doser (20a, 20b), being distinct from it in the guise of an external accessory, which ? composed of: a base structure (101) integrally joined to a hooking or support fork (102) for said filter holder cup (30), at least one load cell (104) of the type with horizontal loading surface which ? placed above said base structure (101), a detection plate (103) which acts as a loading surface being placed horizontally above said cell (104), an electronic management card (105) of the cell (104) ; and where the said sensing plate (103) ? adapted to support and weigh said coffee grinder (20a, 20b), in the conditions of ordinary use, with said dispensing duct (203) positioned in correspondence with said coupling or support fork (102) in such a way that the coffee powder? ground coffee is collected in a filter holder cup (30) hooked to it (101, 102); and where said cell (104, 105), after each grinding cycle and with the motor (201) stopped, automatically detects the weight drop of said grinder-doser (20a, 20b, 103), said weight drop corresponding to the dose of coffee ? That ? from time to time actually ground and dispensed (Ps, Pd, 203, 30); and where the said weighing device (10a, 10b, 105) ? associated with calibration programs (110), of the software type with algorithms and calculation logics, to process said values detected from time to time (Ps, Pd) and to recalculate the grinding times (Ts, Td) corresponding to the optimal dose pre-set (Ds, Dd) in the event that said detected values are outside a pre-set tolerance field; and where said weighing device (10a, 10b) is associated with bidirectional communication means (120), between the cell management electronic board (104, 105) and said motor control electronic board (20a, 20b, 201 , 205), to transmit and/or receive information and/or commands in relation to said detected values; and where to said weighing device (10a, 10b) ? associated with a control panel (106, 206) for displaying the data and for setting said values in weight of the optimal dose (Ds, Dd), with the corresponding grinding times (Ts, Td), and also setting a tolerance range of the detected values; and where the said weighing and calibration device (10a, 10b, 110, 120), immediately after having recalculated (110) the said optimal grinding times (Ts, Td, Ds, Dd) as a function of the weight values each time once detected (103, 104, 105, Ps, Pd), it imparts to said electronic control board (205) of the grinder-doser (20a, 20b) the modification order of the grinding times (Ts, Td), being pre-set therein, in such a way as to obtain an automatic and instantaneous calibration of the delivered dose. 2. A weighing and calibration device (10a), according to claim 1, characterized in that said control panel (106), of the type with display (107) and buttons (108), ? frontally incorporated in said base structure (101) below the hooking or support fork (102) and ? directly connected to said management card (105) of the load cell (104); said weighing and calibrating device (10a, 106), to control (105, 106, 120) and calibrate (104, 110, 120) a grinder-doser (20a) without a control panel, said panel (106) being suitable for operating the cell (104, 105), displaying the measured and/or recalculated values (110), and also suitable for operating the motor (201, 205) of the grinder-doser (20a) and setting the weight values of said optimal doses fixed (Ds, Dd); 3. A weighing and calibrating device (10b), according to claim 1, characterized in that it uses a remote control panel, detached from said base structure (101). 4. A weighing and calibrating device (10b), according to the preceding claim, characterized in that said remote control panel ? a control panel (206) integrated in the grinder-doser (20b), of the type with display (207) and buttons (208), which ? directly connected to said electronic control board (205) of the motor (201) and also ? in communication (120) with the electronic management board (105) of the cell (104). 5. A weighing and calibration device (10a, 10b), according to claim 1 or 2 or 3 or 4, characterized in that said calibration programs (110) are, alternatively, installed in its own electronic management board (10a , 105, 120) or said electronic control card (10b, 205, 120) of the grinder-doser (20a, 20b) to be calibrated. 6. A weighing and calibration device (10a, 10b), according to claim 1 or 2 or 3 or 4, characterized in that said calibration programs (110) are remote, alternatively residing in an external electronic device, such as a mobile phone, or on the internet, as happens in systems called clouds. 7. A weighing and calibration device (10a, 10b), according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that said bidirectional communication means (120) consist of a direct connection via cable; and where said cable has a USB type standard suitable for communication and power supply. 8. A weighing and calibration device (10a, 10b), according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that said bidirectional communication means (120) consist of a wireless type connection, where in each of said electronic boards (105, 205) are the relative transmission components installed? reception (121a, 121b). 9. A weighing and calibration device (10a, 10b), according to the preceding claim, characterized in that said wireless connection is, alternatively, of the direct type with Bluetooth technology, or of the indirect type over the internet with Wi-Fi technology . 10. A weighing and calibration device (10a, 10b), according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that said calibration programs (110) follow a logic of processing and continuous recalculation of grinding times (Ts, Td), with feedback, where said logic ? based on values set by the operator (106, 206) as a reference which are: ? an optimal grammage of the dose, i.e. the nominal weight value of a single dose (Ds) and of a double dose (Dd) to which the respective grinding times (Ts, Td) are provisionally associated; ? a field of tolerance of the values in weight detected from time to time (Ps, Pd), with respect to the said nominal values (Ds, Dd), where are the permitted values or the doses considered compliant for which they are not? no recalculation expected; ? a field of trust? of the weight values detected from time to time (Ps, Pd), with respect to the said nominal values (Ds, Dd), where are the values of the non-compliant doses and which are considered realistic and reliable for the purposes of said automatic recalculation of the times of grind (Ts, Td); said field of reliability?, defined by an upper limit and a lower limit of? reliability? in addition to which there are anomalous or unrealistic values, which are not considered for the purposes of said recalculation as they are caused by an executive or functional anomaly of the grinder-doser apparatus (20a, 20b); and wherein said calibration programs (110), in recalculating the grinding times (Ts, Td), consider only said reliable values, being outside said tolerance range but inside said reliability range; and where said calibration programs (110), following said recalculation, calibrate the grinder-doser (20a, 20b) by means of its control card (205), modifying the grinding times (Ts, Td) in it just recalculated, like a retraction. 11. A weighing and calibration device (10a, 10b), according to the preceding claim, characterized in that the said calibration programs (110) carry out the said processing of the detected weight values (Ps, Pd) and the said recalculation of the grinding times (Ts, Td) according to two operating logics which are alternatives to each other: a first logic called ordinary logic, which ? performed during ordinary use of the grinder-doser (20a, 20b) in the manner of a predefined operating mode, and a second logic called forced logic, which temporarily interrupts said ordinary logic when an adjustment of the granulometry and/or the millstones, in such a way as to immediately calibrate the grinder-doser (20a, 20b) according to said variations and then restart with an updated ordinary logic; and where, in said ordinary logic, only the detected values (Ps, Pd) are considered which are outside said tolerance field and included in said reliability field, from time to time only positive or only negative, while in said forced logic at least one undetected purge delivery is first performed (104, 105) and then at least one? sample whose weight value ? considered for the purposes of the said recalculation (Ts, Td). 12. A weighing and calibration device (10a, 10b), according to the preceding claim, characterized in that said calibration programs (110) start said recalculation according to said ordinary logic as soon as (104, 105) number three are detected single doses (Ps) or number three double doses (Pd) which are consecutively out of tolerance and all within the said field of reliability? positively or negatively, where their average yields an actual supply constant from which the new grinding times (Ts, Td) are obtained. 13. A weighing and calibration device (10a, 10b), according to the preceding claim, characterized in that said calibration programs (110) when ? detected a weight value (Ps, Pd) outside said reliability range, being unreliable due to an anomalous dose, implement a temporary suspension of said recalculation (Ts, Td) in such a way as to verify if the ?anomaly persists, in which case measures must be taken to resolve it, or ? an occasional and negligible abnormal dose; and where, if said anomalous values persist, an alarm indication is expected to be made visible by the operator, while in the opposite case, or with occasional anomalies, said recalculation resumes without notifying the operator.