Device for grinding coffee or other food products

FIELD: personal use articles.

SUBSTANCE: invention relates to household appliances. A device for grinding coffee, implementing the claimed method, comprises a housing within which at least two grinding heads are located, of which at least one is rotating. It also contains means for actuating of the said at least one grinding head, an inlet for coffee supply between grinding heads and an outlet for milled coffee. Preferably, the said housing and the grinding heads located inside it are connected with the means of actuating through the detachable locking connection, which ensures their rapid removal and re-assemble without tools. Preferably, this device includes means for controlling the distance between the grinding heads, and at least one sensor for measuring this distance and/or sensor of rotation speed of the drive shaft.

EFFECT: claimed group of inventions enables to improve reliability and efficiency of the device operation.

20 cl, 6 dwg

 

The present invention relates to a device for grinding coffee or other food products, and particularly to a device for grinding products such as coffee, barley, flowers, herbs, etc. in powder, supplied in automatic or semi-automatic machines for the preparation and bottling of beverages produced by the brewing of such products.

Usually semi - automatic or automatic machines for making beverages based on coffee, barley, herbs, flowers or other foods with grain size, not suitable for the corresponding cooking process, provide appropriate grinding device. Such devices, for both domestic and professional use, includes a housing, a pair of grinding heads (at least one of which rotates), located in the housing, motorized device for driving a rotating grinding head, the hopper for feeding the food product (for example, coffee beans or grains) between the grinding heads, an outlet for crushed or powdered product, as well as a mechanism for regulating the distance between the grinding heads in order to change the granularity of the crushed product.

Grinding heads differ from others who ha according to the shape of the edges and, in General, they can be flat (or concave-concave), conical (or concave-convex), rollers, etc. and they can be placed one inside the other, or vertically one above the other. Concave-convex grinding head, for example, usually are concentrically arranged, with the convex grinding head inside concave grinding head. Flat grinding heads usually are concentrically arranged, one above the other.

In the field of semi - automatic and automatic machines more widely used flat or concave-convex grinding heads due to their simplicity, while the roller head is more widely used in industrial area. In General, the present invention relates to any type of grinding head and is not limited to any particular type of grinding head.

Traditionally known grinding devices of a type suitable for use cases listed above, performed poorly packaged designs that require accurate machining with associated problems of quality and value.

As is known, the size of grains of ground coffee is a particularly sensitive parameter in the complex parameters required for the beverage based on the KOF is, especially in the case of espresso. Similarly, the size of grains of other specified foods (barley, flowers for herbal teas, etc) is also important for the organoleptic characteristics of the beverage, brewed from such milled products.

The size of the grains, once selected and specified, must remain as constant as possible over a long period of time, even if grinding device must be disassembled and reassembled for maintenance or cleaning of parts.

Because the value of the size of the grains of ground coffee or other milled products depends to a large extent on the distance between the grinding heads, removing the grinding device with a drive motor for maintenance or repair and subsequent further reassembly is in the prior art considerable problem because it also includes the dismantling of the grinding heads with subsequent loss set the size of the grains.

In addition, the known grinding devices performed poorly aggregated structures, do not allow to dismount and subsequent re-Assembly without the use of tools, such as screwdrivers, pliers, the guy is major keys, and the like.

Because Dismounting according to the prior art also affects parts that come into contact with food, in this case, the grinding head is in contact with the coffee beans and powder, you need to use tools to complete uninstallation and subsequent reassembly is also in contradiction with the norms that prohibit this.

Recently appeared on the market of automatic machines for the preparation and bottling of beverages, equipped with devices for adjustable grinding coffee for maintaining the required size of the grains of the coffee powder. In such devices the size of grains of coffee grains is regulated by changing the distance between the grinding heads.

For example, in Italian patent IT 1140758 in the name of Lucio Grossi describes grinding device used in automatic machines for the preparation and bottling of coffee, which provides for the automatic adjustment of the distance between the grinding heads on the basis of the difference between the actual measured time (duration) pouring drink made of coffee, and a predefined time that is used as the sample. If the actual time of serving less than taken as sample E. alone time the grinding heads are moved closer to each other in order to reduce the size of the grains of coffee grains, that is to reduce the diameter of the particles of the coffee powder. The effect thus obtained, under equal other conditions is to increase the time of serving prepared following this regulation, because the water supplied to the cooking chamber of the corresponding machine, more time is required for passing through the thin coffee powder. If the actual time pouring more than taken as a sample reference time, the grinding heads are moved apart, that is, the distance between them increases to increase the size of the grains, i.e. to increase the diameter of the particles of the coffee powder. The effect thus obtained under equal other conditions, is to reduce the time of serving prepared following this regulation, because the water supplied to the cooking chamber of this machine, it takes less time to pass through the "large" coffee powder. If the actual time of the pouring of the drink is equal to or almost equal to taken as a sample reference time, the distance between the grinding heads remains unchanged and the size of grains of ground coffee is not changed. Specialists in this about the Asti equipment must be clear, in the grinding device according to patent IT 1140758 change the size of grains of coffee due to a change in the distance between the grinding heads affects the characteristics of the drinks, brewed once this change is made, and it has no effect on the already-poured drink.

Grinding device according IT 1140758 and devices, equivalent, easily razregulyatsii. After repeating the regulation of the size of grains of ground coffee, and hence, after the distance between the grinding heads was changed many times, starting from some initial reference position, the device may set the grinding head is wrong, or the distance between the grinding heads can no longer match the distance that is required as compared to the initial reference distance. In other words, the initial reference distance between the grinding heads can be changed that has a negative impact on the accuracy of regulatory and get the actual size of the grains.

Another disadvantage of conventional solutions is that the known device is not able to recognize the absence of grains of coffee or other food products between the grinding heads. D. the ugogo words, the known device cannot recognize the moment when the milled product ended (no), or when the device is in operation does not give any powder product machine for the preparation and bottling of beverages, prepared by cooking such powders.

The purpose of the present invention is to realize a device for grinding coffee and other foods, which simply and effectively eliminates the disadvantages of conventional solutions, being at the same time economical and reliable.

The purpose of the present invention is to realize a device for grinding coffee powder in the form of beans or grains, which makes it easy to dismantle for cleaning parts or allows multiple cycles of regulating the size of the grains without this device has lost calibration, i.e. without changing the mutual positioning of the grinding heads, and, consequently, without changing the specified size of the grains of ground coffee.

An additional objective of the present invention is to realize a device for grinding coffee and other food that is easy to mount and unmount manually, without the use of tools.

An additional objective of the present invention enables the fast is in order to realize a device for grinding coffee and other food products, which provides feedback control, is automatically associated with the size of the grains milled food products.

These and other objectives are achieved in the present invention, which relates to a device for grinding coffee, the corresponding paragraph 1 of the claims.

In General, a device for grinding coffee maker includes a housing, inside of which there are at least two grinding heads that can refer to any type known in the art, for example, flat or concave-convex (conical). At least one of the grinding heads is driven into rotation around its axis relative to the fixed grinding head or to a stationary grinding heads. The milled coffee, coffee beans, of a type available on the market, or other milled food product is fed between the grinding heads through the corresponding inlet. The milled product is crushed into powder, is fed into the unloading section, for example in a machine for coffee, through a vent hole in accordance with grinding heads. Preferably, the housing and the grinding head inside it, mo is to be paired with means for bringing the rotation of the grinding head by means of a snap connection, which makes it possible to remove and disconnect without tools.

Compared to traditional solutions, the device according to the present invention allows to quickly assemble and disassemble the grinding head and the associated body in order to perform the operation clean parts or maintenance, without risking to contaminate food products that are present inside the external tools or equipment.

Another advantage is that the housing can be replaced very simply. For example, the housing can be treated interchangeably type in order to adapt the device to different machines for the beverage industry.

Experts in the art should understand that the device according to the present invention can be used to grind not only coffee, but also barley, flowers for herbal teas and infusions, cocoa and other foods that must be submitted in the form of a powder in an external device.

Means to actuate contain a drive shaft rotating about its axis, and extending from its supporting bearings. Case grinding heads is associated with a supporting pillar by means of a bayonet connection. In other words, the connection between housing perumal the living heads, and a supporting pillar refers to the bayonet type, that is, the angular swivel connection covered and covering parts having complementary shape. This type of connection is used, for example, in cameras for quick removal and re-attachment of the lens to the camera body that allows you to quickly attach and detach the case and its contents manually, without tools, keys, etc., preventing, thus, the food product from contact with external tools.

Bayonet connection between the housing grinding heads and a supporting pillar prevents relative axial and radial movement. After the operator has inserted and turned the case with grinding heads on the drive shaft, the housing remains fixed in its position.

A rotating grinding head is located in the housing, is placed on the drive shaft and connected to it by means of a groove and pins. Specifically, this connection makes possible the transmission of torque from the shaft to the grinding head, but it does not prevent the axial displacement of this grinding head on the shaft. The drive shaft passes through the Central opening in the stationary grinding head and not associated with her directly.

Preferably, the connection is carried out by introducing and locking device according infusion is he to the invention, allowed to handle the case together with the grinding heads, therefore, as if this is a "block" components, which are secured by means of connection on the drive shaft, for example, on the shaft of the traditional electric motor.

To prevent detaching the housing from the supporting base device further comprises a locking element mounted with the possibility of removal at the free end of the drive shaft. The locking element, lockable manually on the drive shaft, a locking unit formed by the housing and the grinding heads on the same drive shaft.

Preferably, the device for milling according to the present invention includes a means of regulating the distance between the grinding heads to ensure the change of the size of grains of milled product. Such controls can be fully manual, fully automatic or semiautomatic.

More preferably, such means of control was automatic and managed by the managing unit, or, if the device is installed in the machine for coffee, a control unit of this machine.

The control unit actuates the means of regulating the distance between the grinding heads, when necessary, on the basis of the control of the military communications associated with the size of the grains of ground coffee or product, they are crushed in this device.

The device according to the present invention is equipped with at least one sensor that produces a signal that characterizes the distance between the fixed and rotating grinding heads. The signal issued by the sensor is sent to the control unit for processing. In other words, the control unit may, at any time to control the relative distance between the grinding heads, analyzing the signal from the sensor. The sensor may be electrical, optical, mechanical, magnetic, etc.

The sensor can, for example, be in the form of a linear displacement sensor associated with the housing defining an axial stroke (i.e. moving along the length of the drive shaft) grinding head relative to the rest of the grinding heads. Alternatively, the sensor may be optical or infrared type or sensor gap, based on the Hall effect, is able to determine the distance between the grinding heads remotely. When grinding heads are arranged one inside the other, the sensor is set up to measure the distance between the grinding heads in the radial direction.

According to an additional variant of realization of this image is to be placed, alternatively, or in addition to the aforementioned sensor device also includes a tachometer for determining the number of revolutions per minute of the drive shaft. This tachometer sends a signal to the control unit that handles it. In particular, the control unit compares a certain tachometer speed of the drive shaft with the pre-selected value, and on the basis of this treatment, he recognizes, present or no granules between the grinding heads. In other words, the device according to the present invention provides a feedback control on the presence or absence between the grinding heads grains of coffee or other products subject to grinding. Preferably, the control unit comparing the value of the number of revolutions of the drive shaft corresponding to the signal sent by the tachometer, with one or more reference values related to the number of revolutions of the drive shaft within the ideal cycle grinding. The difference between the certain current value and a reference value for the same point in time (for example, counted from the beginning of the turn on drive shaft) indicate the number of the milled product, located between the grinding head device.

For example, if the number of grains is of, located between the grinding head is less than the specified, the resistance provided by coffee grinding heads, also lower than expected, and the drive shaft will rotate at a speed higher compared to the reference. This situation indicates a lack of coffee. The control unit sends a signal requesting operator intervention, which in this case can act in such a way as to restore the correct amount of coffee to be grinding.

If, instead, the drive shaft rotates at a lower speed than a preset reference speed, the resistance provided by grinding the heads, too, which suggests that the grinding head can be partially jammed, for example, due to the presence in the case of a foreign body or due to the presence of solid agglomerations of coffee. The control unit sends an alarm.

If the drive shaft rotates at a speed approximately equal to the reference speed, then the control unit sends a signal about the change in the normal operation of the device.

According to another implementation variant of the present invention alternatively or in addition to the aforementioned sensor device also includes a sensor that determines the time, setrac is by the drive shaft for performing pre-set number of revolutions per cycle enable, and sends a corresponding signal to the control unit. The control unit compares the time spent driving shaft for the implementation of this pre-set number of revolutions, with the expected reference value, and on the basis of such data it recognizes, are present or not between the grinding heads of the coffee beans or other products. For example, if the time it takes the drive shaft for the implementation of predefined 500 rpm, less than a preset time, the control unit interprets this difference as lack of product between the grinding heads and performs the necessary correction, affecting other elements of the feeding device or alarm. If the time spent driving shaft for the implementation of predefined 500 rpm, more than the expected time interval, the control unit interprets this difference as the presence of some interference between the grinding head and falls alarm. If the time it takes the drive shaft for the implementation of predefined 500 revolutions corresponds to the interval specified time, the grinding cycle is normal, and the control unit does not change the mode of the device.

Processing data produced by the control unit in about the wearing speed of the drive shaft or in relation to the duration of its on state (time, required to perform a predefined number of revolutions), can be used to adjust the size of the grains of the milled product and/or to control one or more operating parameters of the device. The control unit in accordance with the above-mentioned data may increase, decrease or keep constant the switching time of the device, carrying out or not carrying out, thus changing the size of the grains processed product.

In addition to the regulation of the distance between the grinding heads or as an alternative to this regulation control unit, processing the signal provided by the aforementioned sensors can detect possible discrepancies of one or more operating parameters in comparison with appropriate reference values. For example, control unit, and comparing the speed of rotation of the drive shaft with reference values, can detect the presence/absence of coffee for milling, the average portion of cooked ground coffee, etc.

Preferably, the control unit could be associated with a control unit external to the machine. For example, the device according to the present invention may relate to a modular type that is installed in a traditional automatic is ski machines for the preparation and bottling of beverages. Thus, the control unit of the device according to the present invention can receive and process data associated with the size of the coffee grains, obtained by grinding on this device, and used the mentioned machine for preparing a drink.

The data retrieved and processed in control unit selects, for example, from among: cooking time coffee powder used number or servings of coffee, the degree of compaction of the coffee powder, the volume and/or pressure of water for cooking. The feedback control associated with the size of the grains of ground coffee, is a managing unit that processes such data and extrapolieren the corresponding values of the size of grains of coffee used to prepare the drink. Preferably, this data was processed in the managing unit, comparing the received data with reference data in accordance with algorithms or block diagram, included in the memory block constructor.

According to a preferred implementation variant of the present invention the means for regulating the distance between the grinding head includes a ring coaxial with the housing and being in engagement with the latter by means of screw threads that allow relative axial movement (with iniana and uncoupling of these two elements causes relative movement along a common axis, in practice, along the axis of the drive shaft). The ring is connected with a fixed grinding head while rotating grinding head mounted on the drive shaft. The ring is provided with a worm gear mechanism, which when activated, control unit transfers the rotation of the thread relative to the body.

The device is simple. Control unit, when necessary on the basis of processing of the received data and based on the signal provided by the sensor or tachometer drives a worm mechanism for imparting relative rotation between the ring which supports the fixed grinding head, and body. The resulting effect is to reduce or increase (in accordance with the direction of rotation is enabled mechanism) the distance between the fixed grinding head and a rotating grinding head, changing, therefore, the size of the grains of powder ground coffee.

Preferably, the housing was located in the elastic element, preventing the grinding head, which should prevent excessive reduction of the distance between the grinding head and the emergence of a mechanical collision between such elements.

The device according to the present invention in addition it is easy to manufacture Assembly and Dismounting is reliable and can be made from components that can be easily found on the market at a reasonable price.

Assembly and Dismounting of the housing and the grinding head relative to the motor is simple and can be easily performed without requiring the use of keys or tools, thereby preventing contamination of the interior space of this device. This facilitates cleaning and maintenance of the device. Dismounting provides that the operator removes the locking element with the free end of the drive shaft and by moving to the first rotatable around the axis of the drive shaft, and then progressively along the same axis clinivet "block", formed by a housing and a grinding heads (and the ring, and ultimately, and other elements present in the body). The whole Assembly formed by the body, involves putting a "block" on the drive shaft and then rotate to lock the bayonet fastening. The operator acts in this way to provide such a joint, placing the locking element at the end of the drive shaft.

The feedback control associated with the size of the grains of powder ground coffee, allows to intervene for that is about, to compensate for any possible errors in the grinding, preserving, thus, quality standards beverages, prepared, starting with this coffee, almost unchanged for a long time.

In addition, the device can easily be installed in a traditional automatic machines for the preparation and bottling of beverages. The control unit is adapted to mate with the control block machines for coffee, in which it is installed.

Another advantage compared to traditional solutions is that this device prevents any possible problems during grinding, resulting from loss of settings or incorrect Assembly of parts. Actually the control unit able to check the exact distance between the grinding heads at any point in time, analyzing the signal provided by the previous sensor, and may intervene in order to compensate for any possible undesirable inaccuracies relative position.

Hereinafter the invention will be described in detail with reference to the accompanying figures, which are given by way of example and not limitation, and in which:

figure 1 is a perspective view with a detail of the device according to the present invention;

figure 2 is a view in pers is active on top of the device, shown in figure 1;

figure 3 is a top view of the device shown in figure 1;

figure 4 is a longitudinal section of the device shown in figure 1;

figure 5 is a view in transverse section of the device shown in figure 1;

figure 6 is a side view of the device shown in figure 1.

In figures 1-6 position 1 indicates a plate, on which is located a hollow hour 2, inside which is housed an electric motor M, for example, the traditional type, to actuate the grinding device G. the Plate 1 allows you to secure the device on the external surfaces, for example surfaces automatic or semi-automatic machines for the preparation and bottling of beverages, such as machines, of a type known in the industry under the abbreviation "HoReCa", which means "for hotel-restaurant-café".

With the stand 2 are connected to the supporting pillar 3, within which is placed a gear wheel 4, which is driven in a known manner by an electric motor M through a gear 4A and the belt 4B. The supporting pillar 3 is closed at its bottom by a wall 5, which acts as a bearing for the end 6 of the shaft 7, combined with the toothed wheel 4. The shaft 7 is installed in a vertical position and is in the form of a console from the support 3 via with whom opico 8 wheels 4, with which it is United, which is installed on the bearing 9 located in the bottom wall 5. Experts in the art should understand that the drive shaft 7 can be written shaft of the motor M, or the device can be set in motion directly, without gears 4.

The supporting pillar 3 closed top wall 10, which in addition to the support for the wheel 4 functions as a support and fastening of a casing 11 containing grinding coffee mechanism and, in particular, the grinding head.

The housing 11 is connected with a supporting pillar 3 by means of a locking connection. According to a preferred implementation variant of the present invention, the housing 11 is connected to the supporting pillar 3, and specifically with the wall 10 by a bayonet connection. As shown in figure 1 and in figure 6, this connection is covered and covering elements and contains a circular sector 12, made in the wall 10 or the associated and corresponding curvilinear segments on the wall 13, protruding from the outer wall of the casing 11, being attached to it or run with it as a whole. Such curvilinear segments 13 are concentrically from the outer wall of the casing 11 and are designed to be inserted into the recess formed in a circular sectors 12, along which the wall 10. The cross-section of the segments 13 and the cross-section of the deepening of the sectors 12 are such that they form a connection in the form of the coupling. Alternatively, a circular sector 12 can be performed on the housing 11, and the curved segments on the wall 10.

The housing 11 is inserted in the axial direction on the drive shaft 7. In other words, the housing 11 is attached to the shaft 7 by moving, which leads to the fact that the shaft is inserted into the housing along its axis (direction D in the figure 4). To this end, the housing 11 has a bottom Central opening 15 through which passes the drive shaft 7. The same wall 14 also forms the basis of the axial recess 16 within which is located a bearing 17, which is intermediate bearing for supporting the grinding head support 18, in the shape of a bowl, forming a cavity for the lower grinding head 19, which in this case is of the conical type, and alternatively it may be a flat grinding head.

Grinding head 19 of the ring shape is attached to the base 18 of the grinding head by several screws.

The Central portion 18 of the grinding head is equipped with an axial hole 118 through which the drive shaft. The hole 118 is in contact with the plug 20 mounted on the drive shaft 7. Being in engagement with the sometimes 18 grinding head, key 20 transmits rotation from the drive shaft 7 to the support 18 of the grinding head, and hence the grinding head 19, which in this case is a rotating grinding head.

The upper end 21 of the speaker in a vertical direction of the drive shaft 7 is threaded, which fits the locking element 22, for example a nut, which can be removed manually without tools. Between the locking element 22 and the Central part of the support 18 of the grinding head is elastic element, in the preferred embodiment, is a cylindrical coil spring 23.

The upper part of the housing 11, which is circular in cross-section, threaded 111, sliced on the inner surface. This thread is in engagement with a corresponding thread 124 located on the outer surface of the ring 24 against the lower end 224 which is attached, for example, screws, fixed grinding head 25. The ring 24 and the grinding head 25 are arranged along the axis inside the housing 11, with a grinding head 25 is located opposite the grinding head 19. It is obvious that the rotation of the ring relative to the housing 11 regulates the mutual arrangement of the grinding heads 25 and 19 and, consequently, modifies accordingly the size of the grains of ground coffee or other the CSOs ground food product barley, chamomile flowers, herbs, etc.

Preferably, the ring 24 can be rotated relative to the housing 11 by means of the mechanism containing the worm 26. The worm 26 is possible to result in rotation manually, for example, by means of the handle 27 of the control shown in figure 4, or to operate automatically by means of a motor-driven control unit of the electronic type.

In a variant implementation of the invention shown in figures 1-6, the worm 26 is mounted between two bearings 28 located on the plate 29 attached to the upper end of the housing 11. The worm 26 is in engagement with the toothed wheel 30 on the outer rim of the upper end ring 24. Through such a mechanism can be obtained by fine adjustment of the distance between the grinding heads 19, 25, and hence the required size of the grains for coffee processed by the device G.

Preferably, the mechanism for regulating the size of grains of coffee were operated automatically or semi-automatically and included a worm 26 managed by the managing unit, the Central processor, for example, by means of shaft and belt transmission, which is shown schematically in figure 5.

The inner ring 24 includes a hopper 31 with an opening 32 at its base to supply coffee beans in question is ransta 33 between the grinding heads.

The latter, as can be seen in figures 1 and 2, is provided with radial scrapers, which collect, convey coffee and serves it to discharge the exhaust hole 35 provided on the side wall of the housing 11.

From the above, and in accordance with the designs it is clear that the device G grinding coffee according to the present invention may be removed and separated from means M, 7 actuate, which actuate the grinding heads 19, 25 simple manually unscrewing the nut 22, and therefore, without tools of any kind, removing it from the end 21 of the drive shaft 7, by removing in the axial direction of the coil spring 23 located on the same drive shaft 7, and, finally, by the turn of the body 11, as shown by the arrow F in the figure 2.

This rotation allows the release of curvilinear segments 13 from the notch of the 12 sectors, making thus possible the axial removal of the housing 11.

This was possible because the engagement between the pin 20 and the rotating bottom support 18 grinding head applies only to rotary type without axial locking.

Consequently, it is possible to understand the relative positions of the grinding heads 19 and 25 is not changed during operation dismantle, and therefore, the planned value of the size of the grains is not lost.

The collection is and is performed by a modified sequence of working steps described above on the reverse, and the size of the grains remains unchanged.

Preferably, the device G includes a control unit is the Central processing unit to actuate the means of regulating the distance between the grinding heads 19, 25 or means of regulating the size of the grains.

Control unit - CPU actuates a worm 26, for example, by an electric motor M2 and the drive shaft 216, in order to change the distance between the grinding heads 19, 25, when necessary on the basis of the processed data or pre-entered information about the size of grains of ground coffee powder. In other words, the unit CPU performs the feedback control associated with the size of grains of coffee processed by the device G.

Data related to the size of the grains already ground coffee, extrapolated, since the data received from the external units, such as data provided by the machine for coffee, which is equipped with a device G. These data are prepared, starting with coffee, ground device G, and they contain, for example, the time duration of cooking, pressure and/or volume of water for cooking, coffee powder, used for this portion, CTE is the tier of compaction of the powder in the cooking chamber, etc.

Equipped with Central processor control unit G receives data from the machine for coffee and treats them, comparing these data, for example, with reference values stored in a special memory location, determining values of the size of the grains corresponding to drink obtained by precisely defined operating conditions.

If necessary, block the Central processor carries out the rotation of the worm 26 in order to change the distance between the grinding heads 19, 25, changing the size of grains of ground coffee to compensate for any possible changes of other parameters of cooking or to modify the same cooking conditions in such a way as to satisfy the taste of the user coffeemakers.

Preferably, the device G includes a sensor S (see figure 4)is provided for determining the relative distance between the rotating grinding head 19 and the fixed grinding head 25 and a signal corresponding to such data, the control unit is a Central processing unit. Preferably, the sensor S was a sensor based on the Hall effect.

Alternatively, or in addition to the sensor's device G is supplied by the tachometer S 1 to determine the speed of rotation of the drive shaft 7. Tachometer S 1 is placed in the Tinqueux 10 (shown schematically in figure 1, but not detailed), and can determine the speed of rotation of the shaft 7 at a distance, i.e. distantly.

Tachometer S 1 sends an electrical signal to the control unit to the Central processor for processing. Specifically, the control unit is the Central processing unit compares the signal received by the sensor S 1, and, therefore, compares the corresponding measured value of the speed of rotation of the shaft 7 with an expected, predetermined or reference value. The reference value is recorded in the memory unit of the Central processor designer of the device 1. Specifically, the Central unit processor stores in memory the many reference values, each of which refers to the data, since the inclusion of the shaft 7. Such reference values can be set empirically based on the test operation of the device G.

The difference between the measured value at a given point in time and a reference value for the same time indicate the number of the milled food product in the device between the grinding heads.

If the quantity of the product, such as coffee grains that are between the grinding heads 19, 25, lower than what is expected for supplying portion suitable for brewing coffee, the resistance provided coffee var is Levushim heads 19, 25, is also lower than what is expected, and the drive shaft 7 rotates at a speed higher compared to the reference speed. This situation indicates a lack of coffee in the g drive control unit - the CPU sends a signal requiring intervention, or gives a command to the other feeders of the product, subject to grinding, which restores the proper level between the grinding heads 19, 25.

If the drive shaft 7 rotates at a speed lower than the reference, then it is a sign of excessive resistance provided by grinding the heads 19, 25, testifying that the grinding heads 19, 25 can be partially jammed, for example, due to the presence in the body 11 of a foreign body or due to the formation of undesirable agglomeration of the milled product. The control unit is the Central processing unit generates an alarm signal.

If the drive shaft 7 rotates at a speed equal or comparable within a precisely defined boundaries of uncertainty with the reference speed, the control unit is the Central processing unit does not change the normal operation of the device G.

The control unit is the Central processing unit is programmed in such a way as to regulate the size of the grains milled product, based on the signal processing sent tachometer is S 1. Actually, the unit CPU is able to increase, decrease or keep constant turn-on time of the drive shaft 7, based on the resistance provided by grinding the heads 19, 25. In other words, the feedback control associated with the present or not between the grinding heads 19, 25 food product to be processed, can be combined with feedback control related to the size of the grains milled product. Increase on-time reduces the size of the grains and, conversely, decreasing on-time the size of the grains remains large.

As for the sensor S, it can refer to mechanical, electrical or optical type, for example: infrared or code position sensor, the sensor based on the Hall effect, etc. control unit - CPU receives the signal from the sensor S and processes it to determine when it is necessary, the actual position of the grinding heads 19, 25.

According to a variant implementation of the present invention alternatively or in addition to the above sensor's device G includes a sensor T, not shown in the drawings, which determines the time the drive shaft 7 to perform the preset quantity is of revolutions per cycle enable, and sends a corresponding signal to the control unit to the Central processor. The control unit is the Central processing unit compares the time spent driving shaft 7 to perform this pre-set number of revolutions, for example, 200, 300 or 500, with pre-planned reference value and on the basis of such data it recognizes, are present or not between the grinding heads of the coffee beans or other products. For example, if the time it takes the drive shaft 7 for the fulfilment of 300 rpm, is less than a pre-scheduled time interval, the control unit is the Central processing unit interprets this difference as indicating the absence of a product subject to friction between the grinding head drive shaft 7 rotates more quickly than expected, due to the low resistance encountered grinding heads 19, 25, and he ends his on cycle before, and he takes the necessary corrective action, for example, affecting other parts of the feeding device or alarm. If, instead, the time spent driving shaft for the fulfilment of 300 rpm, more than a pre-scheduled time interval, the control unit is the Central process is the Sora interprets this difference as indicating the presence of some interference between the grinding heads 19, 25 drive shaft 7 rotates more slowly than expected due to unexpected resistance provided a rotating grinding head, and he falls an alarm. If the time it takes the drive shaft for the fulfilment of 300 rpm, corresponds to the period of pre-scheduled time, the grinding cycle is normal, and the control unit is the Central processing unit does not interfere with the purpose of changing the mode of operation of the device G.

In General, the control unit is the Central processing unit in addition to or as alternatives to the regulation of the distance between the grinding heads processes the signals from the sensors S, S 1, in order to determine possible differences of the operating parameters of the device with respect to the corresponding reference values. Examples of operating parameters are the average duration of the grinding cycle, the size of the grains milled product, the weight of the milled product, etc.

Control unit - CPU, therefore, able to properly reinstall the grinding heads 19, 25 after their deviations from the preset position or rosregulirovanie, for example, due to incorrect re-Assembly or wear.

1. Device (G) for grinding coffee or other food products, teramae housing (11), inside of which there are at least two grinding heads (19, 25), of which at least one of (19) is rotatable; means (2) actuate mentioned, at least one grinding head (19) which includes a drive shaft (7)driven in rotation around its own axis, which protrudes from the supporting base (3), the inlet opening (32) for supplying coffee between grinding heads (19, 25) and the outlet (35) for ground coffee, and the said body (11) and grinding heads (19, 25)located within it, coupled with the aforementioned means of driving (2) by means of a detachable locking connection(12, 13, 18, 218, 20, 120), which makes possible its quick removal and re-Assembly without tools; and a control unit (CPU)that compares the speed signal mentioned drive shaft (7) with one or more reference values to detect discrepancies of one or more operating parameters of the device in relation to the relevant reference values, characterized in that the said control unit (CPU)when necessary on the basis of such comparison, actuates the means (26, 30, 2, 111, 124) regulation of the distance between the grinding what olukemi (19, 25) or changes the time mentioned drive shaft (7).

2. Device (G) according to claim 1, in which the aforementioned detachable locking connection is made in the form of a bayonet connection (12, 13)connecting the housing (11) with said supporting pillar (3)preventing relative axial and radial movement, and contains the connection (18, 218, 20, 120) between the said rotating grinding head (19) and drive shaft (7) for transmitting rotation, which provides the axial movement of a rotating grinding head (19) relative to the drive shaft (7).

3. Device (G) according to claim 2, characterized in that it further comprises a locking element (22)mounted with the possibility of dismantling at the free end (21) of the drive shaft (7) for locking the aforementioned detachable locking connection(12, 13, 18, 218, 20, 120).

4. Device (G) according to any one of the preceding claims 1 to 3, characterized in that it further comprises automatic, semi-automatic or manual means (26, 30, 2, 111, 124) regulation of the distance between the grinding heads (19, 25) to change the size of grains of ground coffee.

5. Device (G) according to claim 4, in which the aforementioned control unit (CPU) actuates the means (26, 30, 2, 111, 124) regulation of the distance between the grinding g is loukami (19, 25) automatically, when necessary, based on feedback control, the size of the coffee grains, milled device.

6. Device (G) according to claim 5, characterized in that it contains at least one sensor (S), which outputs a signal characterizing the distance between the said grinding heads (19, 25), while the aforementioned control unit actuates the means (26, 30, 111, 124) regulation of the distance between the grinding heads (19, 25) on the basis of signal processing, characterizing the distance obtained from the sensor (S).

7. Device (G) according to claim 1, characterized in that it contains at least one tachometer (S1), which outputs a signal characterizing the speed of rotation of the aforementioned drive shaft (7).

8. Device (G) according to claim 6, characterized in that the said control unit is connected with the coffee machine in order to receive and process data associated with the size of the coffee grains, milled by the device and used the mentioned machine for preparing a drink, and said data are selected from among: cooking time coffee powder used number or servings of coffee, the degree of compaction of the coffee powder, the volume and/or pressure of water for boiling.

9. Device (G) according to claim 4, characterized in that the said means to regulate the Finance distance between the grinding heads (19, 25) includes a ring (24), coaxially with the said body (11) and associated by-thread 111, 124)providing relative axial movement, while the said ring (24) is connected with a fixed grinding head (25).

10. Device (G) according to claim 9, characterized in that said ring (24) is provided with a worm gear mechanism (26) to rotate through the above thread (111, 124) relative to the said housing (11).

11. Device (G) of claim 10, in which the aforementioned control unit (CPU) actuates mentioned worm gear (26) in order to increase or decrease the distance of the grinding head (25) with respect to the rotating grinding head (19).

12. Device (G) according to claim 2, characterized in that the said connection between the shaft (7) and the above-mentioned rotating grinding head (19) comprises a support (18) grinding head equipped with a through axial hole (118) with diametrically opposed axial grooves (218), and key (20)connected to the drive shaft (7)at the ends (120) mentioned pins (20) are slidable in said axial grooves (218).

13. Device (G) according to claim 3, characterized in that it further comprises a spring (23)is installed between the locking element (22)located at the free end (21) of the shaft (7), and cited what Uta support (18) rotating grinding head.

14. Method for grinding coffee or other foods in the device, comprising a housing (11), inside of which there are at least two grinding heads (19, 25), of which at least one of (19) is rotatable; means (2) actuate mentioned, at least one grinding head (19) which includes a drive shaft (7)driven in rotation around its own axis, which protrudes from the supporting base (3), the inlet opening (32) for supply of coffee between grinding heads (19, 25) and the outlet (35) for ground coffee; and a control unit (CPU)that compares the speed signal mentioned drive shaft (7) with one or more reference values to detect discrepancies of one or more operating parameters of the unit relative to the respective reference values, characterized in that the said control unit (CPU)when necessary on the basis of such comparison, actuates the means (26, 30, 2, 111, 124) regulation of the distance between the grinding heads (19, 25) or changes the time mentioned drive shaft (7).

15. The method according to 14, in which the distance between the grinding heads (19, 25) is adjusted to change the size of the grains of ground coffee through an automatic semi-automatic or manual means (26, 30, 2, 111, 124).

16. The method according to item 15, in which the regulation of the distance between the grinding heads (19, 25) is automatically referred to the managing unit, which actuates the means (26, 30, 2, 111, 124) of the regulation, when necessary, based on feedback control associated with the size of grains of coffee making that same device.

17. The method according to clause 16, in which the control unit (CPU) actuates the means (26, 30, 2, 111, 124) regulation of the distance between the grinding heads (19, 25) on the basis of signal processing distances obtained from at least one sensor (S), which outputs a signal characterizing the distance between the said grinding heads (19, 25).

18. The method according to 14, in which the said signal characterizing the speed of rotation of the aforementioned drive shaft (7), issued at least one tachometer (S1).

19. The method according to 14, in which the aforementioned control unit is connected with the coffee machine in order to receive and process data associated with the size of the coffee grains, milled by the device and used the mentioned machine for preparing a drink, and said data are selected from among: cooking time, coffee powder, use is controlled quantity or coffee, the degree of compaction of the coffee powder, the volume and/or pressure of water for boiling.

20. The method according to 14, in which the means of regulating the distance between the grinding heads (19, 25) includes a ring (24), coaxially with the said body (11) and installed it through the thread (111, 124) in order to perform relative axial movement, while the said ring (24) is connected with a fixed grinding head (25) and provided with a worm gear mechanism (26) for rotation on the said thread (111, 124) relative to the said housing (11), and the aforementioned control unit (CPU) actuates mentioned worm gear (26) in order to increase or decrease the distance of the grinding head (25) with respect to the rotating grinding head (19).



 

Same patents:

FIELD: personal use articles.

SUBSTANCE: invention relates to household appliances. A device for grinding coffee, implementing the claimed method, comprises a housing within which at least two grinding heads are located, of which at least one is rotating. It also contains means for actuating of the said at least one grinding head, an inlet for coffee supply between grinding heads and an outlet for milled coffee. Preferably, the said housing and the grinding heads located inside it are connected with the means of actuating through the detachable locking connection, which ensures their rapid removal and re-assemble without tools. Preferably, this device includes means for controlling the distance between the grinding heads, and at least one sensor for measuring this distance and/or sensor of rotation speed of the drive shaft.

EFFECT: claimed group of inventions enables to improve reliability and efficiency of the device operation.

20 cl, 6 dwg

Up!