Food preparation household electrical system and appliance with coplanar drive

Abstract

The invention relates to a food preparation household appliance having a first drive planetary gear (28.1) comprising a first coupling for a first working tool and a first drive gear (32.1) cooperating with an external toothing of a peripheral gear (34), a second drive planetary gear (28.2) comprising a second coupling for a second working tool and a second drive gear (32.2), characterized in that the second drive gear (32.2) cooperates with the first drive gear (32.1) to drive the second drive gear (32.2) and the second drive planetary gear (28.2) itself in rotation around a second working axis (A2), and in that the peripheral gear (34), the first drive gear (32.1) and the second drive gear (32.2) are coplanar.

Description

TECHNICAL FIELD

[0001] The present invention relates to the general technical field of food preparation domestic appliances comprising a base for receiving a work container, such as a bowl, and comprising a head fixed to the base, said head comprising a planetary gear carrier for driving a work tool, said planetary gear carrier being driven in rotation about a central axis by an electric motor. BACKGROUND

[0002] In conventional food preparation domestic appliances of the above type, the planetary gear carrier generally comprises an eccentric coupling allowing driving a work tool above the base according to a motion combining two rotations about two parallel axes. Such appliances can be used with different work tools, alternately mounted on the same coupling, adapted to different cooking jobs. These appliances are often referred to as "pastry robots", although they can often be used for preparations other than baking.

[0003] For example, "dough mixers" type work tools are known, which generally comprise one or more rigid arms, to allow mixing of dough in the work container.

[0004] "Dough whips" type work tools are also known, which generally comprise one or more thin wires, which can be used to emulsify a preparation contained in the work container.

[0005] In pastry robots, the planetary gear carrier is generally driven in rotation at a relatively low speed, for example 40 to 250 revolutions per minute. Lower speeds are very suitable for certain cooking jobs, and therefore for certain work tools adapted to such jobs, such as for "dough mixers" type work tools. However, certain cooking jobs, and work tools dedicated to them, require, or even benefit from, higher rotation speeds of the work tools. This is the case, for example, for "dough whips" type work tools.

[0006] For example, from document GB2453546, a food preparation domestic appliance is also known, which is intended to be able to drive two categories of work tools of different types, which are intended to be optimally implemented at different speeds. This appliance comprises:

[0007] • a base having a base with a receiving area configured to receive a work container;

[0008] • a head connected to the base, the head having a planetary gear carrier driven in rotation about a central axis by an electric motor, and carrying:

[0009] ■ a first drive planet wheel mounted to rotate freely on the planet carrier about a first work axis parallel to and eccentric with respect to the central axis, said first drive planet wheel comprising:

[0010] ■ a first coupling configured to allow coupling and uncoupling of a first work tool and to drive the first work tool in rotation about the first work axis with respect to the planet carrier, said first coupling being arranged opposite the receiving area;

[0011] ■ a first drive gear having its axis on the first work axis, said first drive gear rotating integrally with the first drive planet wheel and cooperating with an internal toothing of a peripheral gear ring having the central axis as axis of symmetry, for causing the first drive planet wheel itself to rotate about the first work axis during differential rotation of the planet carrier with respect to the peripheral gear ring;

[0012] ■ a second drive planet wheel separate from the first drive planet wheel and mounted to rotate freely on the planet carrier about a second work axis parallel to and eccentric with respect to the central axis, but distinct from the first work axis, said second drive planet wheel comprising:

[0013] ■ a second coupling configured to allow coupling and uncoupling of a second work tool and to drive the second work tool in rotation about the second work axis with respect to the planet carrier, said second coupling being arranged opposite the receiving area;

[0014] ■ a second drive gear having its axis on the second work axis and rotating integrally with the second drive planet wheel.

[0015] In this example, the second drive gear meshes with a second peripheral gear ring having the central axis as axis of symmetry, to drive the second drive planet wheel itself to rotate about the second work axis.

[0016] The two gear rings overlap in the direction of the central axis, and one of them has a conical toothing, which is complex to implement and results in a considerable bulk in the direction of the central axis. SUMMARY

[0017] The object of the present invention is to provide a food preparation household appliance which provides a first work tool coupling and a second work tool coupling which rotate about their respective work axes at rotation speeds which differ from each other in absolute value, while maintaining a simple, compact structure and without requiring significant modifications to the architecture of existing appliances.

[0018] To this end, the present invention provides a food preparation household appliance, said household appliance comprising:

[0019] • a base having a base with a receiving area configured to receive a work container;

[0020] • a head connected to the base, the head having a planetary carrier driven in rotation about a central axis by an electric motor and carrying:

[0021] • a first drive planet mounted free to rotate on the planetary carrier about a first work axis parallel to the central axis and eccentric with respect to the central axis, the first drive planet comprising:

[0022] • a first coupling configured to allow coupling and uncoupling of a first work tool and to drive the first work tool in rotation about the first work axis with respect to the planetary carrier, the first coupling being arranged opposite the receiving area;

[0023] • a first drive gear having an axis that is the first work axis, the first drive gear rotating integrally with the first drive planet and cooperating with an internal toothing of a peripheral ring gear having the central axis as a symmetry axis, for causing the first drive planet itself to rotate about the first work axis during differential rotation of the planetary carrier with respect to the peripheral ring gear;

[0024] • a second drive planet separate from the first drive planet and mounted free to rotate on the planetary carrier about a second work axis parallel to the central axis and eccentric with respect to the central axis, but distinct from the first work axis, the second drive planet comprising:

[0025] • a second coupling configured to allow coupling and uncoupling of a second work tool and to drive the second work tool in rotation about the second work axis with respect to the planetary carrier, the second coupling being arranged opposite the receiving area;

[0026] • a second drive gear having an axis that is the second work axis and rotating integrally with the second drive planet.

[0027] The food preparation household appliance is of the type in which, for a given rotational speed of the planetary carrier, the first drive planet and the second drive planet rotate about their respective work axes at rotational speeds that are different from each other in absolute value.

[0028] The food preparation household appliance is characterized in that the second drive gear cooperates with the first drive gear so that the first drive gear drives the second drive gear and the second drive planet itself in rotation about the second work axis, and in that the peripheral ring gear, the first drive gear and the second drive gear are coplanar.

[0029] The food preparation household appliance can further comprise one or the other of the following features, individually or in combination.

[0030] In certain embodiments, the second drive planet rotates around the second working axis at a rotational speed having an absolute value greater than the absolute value of the rotational speed of the first drive planet around the first working axis, for example 1.1 to 2.0 times the rotational speed of the first drive planet around the first working axis.

[0031] In certain embodiments, the first drive gear meshes directly with the peripheral ring gear without intermediate mechanical elements.

[0032] In certain embodiments, the second drive gear meshes directly with the first drive gear without intermediate mechanical elements.

[0033] In certain embodiments, the second drive gear cooperates with the first drive gear indirectly through at least one intermediate transmission wheel, which is mounted freely rotatably on the planet carrier, such that the first drive gear drives the second drive gear to rotate and the second drive planet itself rotates around the second working axis, which is done through the at least one intermediate transmission wheel.

[0034] In certain embodiments, the second drive gear cooperates with the first drive gear indirectly through a single intermediate transmission wheel, which meshes directly with the first drive gear and at the same time directly with the second drive gear.

[0035] In certain embodiments, the second drive gear has a different number of teeth than the first drive gear.

[0036] In certain embodiments, the second drive gear has a smaller number of teeth than the first drive gear, such that for a given speed of the planet carrier, the absolute value of the rotational speed of the second drive planet rotating around the second working axis is greater than the absolute value of the rotational speed of the first drive planet around the first working axis.

[0037] In certain embodiments, the first drive gear and the at least one intermediate transmission wheel, if present, have a single external toothing. Thus, in the absence of intermediate transmission wheels, the single external toothing of the first drive gear is driven by the peripheral ring gear and drives the second drive gear. Thus, in the presence of at least one intermediate transmission wheel, the single external toothing of the first drive gear is driven by the peripheral ring gear and drives the intermediate transmission wheel(s). When there is only one intermediate transmission wheel, the external toothing of the intermediate transmission wheel is driven by the peripheral ring gear and drives the second drive gear. When there are multiple intermediate transmission wheels, the external toothing of each intermediate transmission wheel is driven by the first drive gear or by another intermediate transmission wheel and drives the second drive gear or another intermediate transmission wheel.

[0038] In certain embodiments, the peripheral ring gear is a ring gear having a single inner toothed row, the first drive gear is a gear comprising a single outer toothed row, said single outer toothed row directly engaging the inner toothed row of the peripheral ring gear, and the second drive gear has an outer toothed row, said outer toothed row directly engaging the outer toothed row of the first drive gear.

[0039] In certain embodiments, the first working axis and the second working axis have the same eccentricity with respect to the central axis.

[0040] In certain embodiments, the first and second couplings have first and second working tool coupling geometries, respectively, which are different from each other.

[0041] The present application also relates to a food preparation household electrical system, the system comprising:

[0042] ■ a food preparation household electrical appliance having any of the preceding features;

[0043] ■ a first working tool configured to allow its coupling to a first coupling of the food preparation household electrical appliance;

[0044] ■ a second working tool configured to allow its coupling to a second coupling of the food preparation household electrical appliance.

[0045] In such a food preparation household electrical system, the first working tool can be configured to prohibit its coupling to the second coupling and / or the second working tool can be configured to prohibit its coupling to the first coupling.

[0046] In such a food preparation household electrical system, the first coupling can be configured to prohibit the coupling of the second working tool and / or the second coupling can be configured to prohibit the coupling of the first working tool.

[0047] Such a food preparation household electrical system can be configured to prevent the simultaneous mounting of one working tool on the first coupling and of another working tool on the second coupling. BRIEF DESCRIPTION OF DRAWINGS

[0048] Figure 1 is a general schematic perspective view of a food preparation household electrical appliance in which the present application can be implemented.

[0049] Figure 2 is a schematic partial side view of a part of a food preparation household electrical appliance in which the present application can be implemented.

[0050] Figure 3 is a schematic partial perspective view of a part of a food preparation household electrical appliance comprising two couplings for two working tools.

[0051] Figure 4is a schematic perspective view showing a peripheral ring gear and a planetary gear carrier with two driving planetary gears according to a first embodiment of the present application.

[0052] Figure 5 is a schematic exploded perspective view showing a planetary gear carrier with two driving planetary gears similar to Figure 4 .

[0053] Figure 6 is a schematic top view of the elements of Figure 4 .

[0054] Figure 7 is a view similar to Figure 4 , showing a second embodiment of the present application.

[0055] Figure 8 is a view similar to Figure 5 , showing a second embodiment of the present application.

[0056] Figure 9 is a view similar to Figure 6 , showing a second embodiment of the present application. DETAILED DESCRIPTION

[0057] Figures 1 to 3 A food preparation household appliance system 10 is shown, which comprises on the one hand a food preparation household appliance 12 of the pastry robot type and on the other hand a first working tool 14.1 and a second working tool 14.2 to be mounted on the food preparation household appliance 12 for acting on food products during a food preparation process. In the example below, the first working tool 14.1 is for example a dough kneading tool and the second working tool 14.2 is for example an egg beater. In general, the first working tool 14.1 and the second working tool 14.2 are two different types of working tools, which have different geometrical shapes, in particular at the working surface of the working tools, which is used for acting on food products during the food preparation process to which the food products are subjected. Preferably, the two tools are designed to be optimally used at different rotational speeds around their working axis.

[0058] The food preparation household electrical appliance 12 comprises a base 15 in the form of a foot here, which comprises a substantially horizontal base 16 and legs 18 extending vertically upwards from the base 16. The base 15 is intended to be placed on a horizontal work surface. The base 16 comprises a receiving area 17 configured to receive a work container 20, which is in the form of a tank here, generally removable. The work container 20 is removably mounted on the receiving area 17 of the base 16, for example by a bayonet connection. The food preparation household electrical appliance 12 also comprises a head 22, which in this example is articulated on the base 15 about a horizontal axis A0, here at the level of the legs 18. In the case where the head 22 is articulated about a horizontal axis A0, it can be moved between a raised position, not shown, in which the work container 20 can be easily removed from the base 16, and a work position, in particular shown in Figure 1 the middle. The concepts of "horizontal", "vertical", "upper" and "lower", and the concepts of orientation resulting therefrom, refer to the normal orientation of the food preparation household electrical appliance 12 in the working state when the base 15 is placed on a horizontal work surface and corresponds to the illustration.

[0059] The head 22 of the food preparation household electrical appliance 12 has a shape which extends horizontally in the longitudinal direction in the working position, which has a rear longitudinal portion, by which the head 22 is connected to the legs 18 of the base 15, and a front longitudinal portion, which extends overhanging above the base 16 and the work container 20. The head 22 can contain a motor 30, preferably an electric motor, as shown in Figure 2 for example, which can be controlled by control buttons 24 arranged for example on the sides of the legs 18. The motor 30 arranged inside the head 22 comprises a motor shaft oriented along a motor axis, which can in particular be horizontal or vertical according to the design. Alternatively, the motor 30 can in particular be provided in the base 15.

[0060] In a manner known per se, the front longitudinal portion of the head 22 comprises a planetary carrier 26 comprising means for driving the first work tool 14.1 and even the second work tool 14.2 in planetary motion. To this end, the planetary carrier 26 is in rotational motion about a central axis AC. In the example shown, the central axis AC is fixed relative to the head 22. According to a design well known to the person skilled in the art, the planetary carrier 26 is driven by the motor 30 via a kinematic chain 25. Each of the first work tool 14.1 and the second work tool 14.2 is intended to be mounted on the planetary carrier 26 to be driven in work motion by the planetary carrier 26. In the work position, the first work tool 14.1 or the second work tool 14.2 mounted on the planetary carrier 26 engages inside the work container 20 to act on the food product contained in the work container 20.

[0061] In the illustrated example, the planet carrier 26 is made in the form of a disc-shaped plate. The planet carrier 26 is mounted integrally with a lower end of a drive shaft 27, the axis of which is the central axis AC. The drive shaft 27 is received in the head 22 and guided inside the head 22 for rotation about the central axis AC. The drive shaft 27 carries a drive wheel 29, which constitutes part of a kinematic chain 25 by which the planet carrier 26 is driven by the electric motor 30. Here, the drive wheel 29 is arranged on an upper part of the drive shaft 27, which extends for example above an internal horizontal wall (not shown) by which the drive shaft 27 of the planet carrier can be guided for rotation.

[0062] The planet carrier 26 carries a first drive planet wheel 28.1, which is mounted for free rotation on the planet carrier 26 about a first work axis A1 parallel to the central axis AC and eccentric with respect to the central axis AC.

[0063] In the illustrated example, it can in particular be seen in Figures 5 to 8 that the first drive planet wheel 28.1 comprises a stem 31.1 extending along the first work axis A1, which is mounted for rotation by the disc-shaped plate forming the planet carrier 26. Thus, the first drive planet wheel 28.1 comprises a lower part projecting below the lower surface of the planet carrier 26 and thus facing the lower part of the receiving area 17, and an upper part projecting above the top surface of the planet carrier 26. Thus, in the illustrated example, the upper part of the first drive planet wheel 28.1 extends in a protected space above the planet carrier 26, which can be considered to be comprised in the head 22.

[0064] The first drive planet wheel 28.1 comprises a first coupler 30.1, which is configured to allow coupling and decoupling of the first work tool 14.1 on the first drive planet wheel 28.1 in the work configuration, and to ensure driving the first work tool 14.1 in rotation about the work axis A1 relative to the planet carrier 26. The first coupler 30.1 is arranged opposite the receiving area 17. In the illustrated example, the first coupler 30.1 is arranged at a lower end of the stem 31.1 of the first drive planet wheel 28.1, and thus below the planet carrier 26.

[0065] The first drive pinion 28.1 further comprises a first drive gear 32.1 having the first work axis Al as its axis and rotating integrally with the first drive pinion 28.1. In the example, this is due to the fact that it is mounted integrally with the bar 31.1. In a known manner, the first drive gear 32.1 cooperates with an internal toothing of a peripheral ring gear 34 having the central axis AC as axis of symmetry to make the first drive pinion 28.1 itself rotate about the first work axis Al during the differential rotation of the planetary carrier 26 with respect to the peripheral ring gear 34.

[0066] In the example shown, the first drive gear 32.1 meshes directly with the internal toothing of the peripheral ring gear 34, so there are no intermediate mechanical elements. However, it can be provided that the first drive gear 32.1 cooperates indirectly with the internal toothing of the peripheral ring gear 34, for example through intermediate gears.

[0067] In the example shown, the peripheral ring gear 34 is fixed with respect to the head 22, but it can be provided that the peripheral ring gear 34 is driven to rotate with respect to the head 22 about the central axis AC, in particular in a direction opposite to that of the rotation of the planetary carrier 26 about the central axis AC.

[0068] In the example shown, the first drive gear 32.1 is carried by the upper portion of the first drive pinion 28.1. It is therefore arranged above the planetary carrier 26, in this case above the disc-shaped plate. The first drive gear 32.1 is thus received in a protected volume above the planetary carrier 26 and is not visible from the outside of the food preparation household electric appliance 12.

[0069] In the example shown, the peripheral ring gear 34 is carried by the head 22 and is fixed with respect to the head 22. It is arranged directly above the planetary carrier 26, in this case in a protected volume above the planetary carrier 26. In the example shown, the peripheral ring gear 34 has substantially the same size as the planetary carrier 26 in a direction diametrical with respect to the central axis AC.

[0070] The planetary carrier 26 carries a second drive pinion 28.2 separate from the first drive pinion 28.1. This second drive pinion 28.2 is also mounted to rotate freely on the planetary carrier 26 about a second work axis A2, which is also parallel to the central axis AC and eccentric with respect to the central axis AC. The second work axis A2 is different from the first work axis Al.

[0071] In the illustrated example, the second drive planet gear 28.2 comprises a stem 31.2 which extends along the second working axis A2 and is mounted for rotation by a disc-shaped plate forming the planet carrier 26. Thus, the second drive planet gear 28.2 comprises a lower part which projects below the lower surface of the planet carrier 26 and thus faces the lower part of the receiving area 17, and an upper part which projects above the top surface of the planet carrier 26. Thus, in the illustrated example, the upper part of the second drive planet gear 28.2 extends above the planet carrier 26 in the same protected volume as the upper part of the first drive planet gear 28.1.

[0072] Similarly to the first drive planet gear 28.1, the second drive planet gear 28.2 comprises a coupler, here referred to as a second coupler 30.2, which is configured to allow coupling and decoupling of the second working tool 14.2 on the second drive planet gear 28.2 in the working configuration, and for driving the second working tool 14.2 in rotation relative to the planet carrier 26 about the second working axis A2. The second coupler 30.2 is arranged opposite the receiving area 17. In the illustrated example, the second coupler 30.2 is also arranged at the lower end of the stem 31.2 of the second drive planet gear 28.2, thus below the planet carrier 26.

[0073] Likewise, the second drive planet gear 28.2 comprises a second drive gear 32.2 which has the second working axis A2 as its axis and rotates integrally with the second drive planet gear 28.2. In the example, this is due to the fact that it is mounted integrally with the stem 31.2.

[0074] From Figures 4 to 9 It can be seen that the second drive gear 32.2 cooperates with the first drive gear 32.1, directly or via at least one intermediate transmission wheel 40, such that the first drive gear 32.1 drives the second drive gear 32.2 and the second drive planet gear 28.2 itself rotates about the second working axis A2.

[0075] It is thus noted that the second drive gear 32.2 does not directly cooperate with the peripheral gear 34 in the sense that it does not directly mesh with the toothing of the peripheral gear 34. This cascade drive makes it possible to simplify the structure, in particular to simplify the geometrical tolerances of the components and assemblies. Indeed, the first drive gear 32.1 and the second drive gear 32.2 are carried by the same component, i.e. the planet carrier 26, while each is mounted to rotate independently of the other on this planet carrier 26. To obtain the chain of dimensions that needs to be respected to ensure the cooperation driving each other, the chain is relatively short and thus can be easily respected during manufacturing and assembly, without having to take design and manufacturing precautions that are expensive to implement. On the other hand, the direct engagement between the peripheral gear 34 and the first drive gear 32.1 is more complex to implement, since it involves the planet carrier 26 which is a (rotatable) mobile part both with respect to the peripheral gear 34 and with respect to the first drive gear 32.1. The chain of dimensions to be respected is thus longer, which means more manufacturing and assembly constraints and thus inevitably higher implementation costs. This longer chain of dimensions is thus not present at the second drive gear 32.2.

[0076] In addition, the peripheral gear 34, the first drive gear 32.1 and the second drive gear 32.2 are coplanar, which is in particular seen in Figure 4 and 7 For embodiments without intermediate transmission wheel 40, the peripheral gear 34, the first drive gear 32.1 and the second drive gear 32.2 are coplanar, in particular as shown in Figure 4 This makes it possible to obtain a particularly compact food preparation household appliance 12, in particular particularly compact in the direction of the central axis AC. In the sense of the present application, the condition is met if there exists a plane perpendicular to the central axis AC which intersects the toothing of each of the peripheral gear 34, the first drive gear 32.1 and the second drive gear 32.2. For examples comprising at least one intermediate transmission wheel 40, the peripheral gear 34, the first drive gear 32.1, the at least one intermediate transmission wheel 40 and the second drive gear 32.2 are coplanar, in particular as shown in Figure 7 This makes it possible to obtain a particularly compact food preparation household appliance 12, in particular particularly compact in the direction of the central axis AC. In the sense of the present application, the condition is met if there exists a plane perpendicular to the central axis AC which intersects the toothing of each of the peripheral gear 34, the first drive gear 32.1, the at least one intermediate transmission wheel 40 and the second drive gear 32.2. When there are a plurality of intermediate transmission wheels 40, the central axis AC intersects the toothing of each of the intermediate transmission wheels 40.

[0077] It is noted that the peripheral gear 34, the first drive gear 32.1 and the second drive gear 32.2 are each arranged above the planet carrier 26.

[0078] In this example, the first drive gear 32.1 and the second drive gear 32.2 are gears with cylindrical geometries around their respective axes A1 and A2. Thus, each of them has a row of teeth with a cylindrical overall geometry around its respective axes A1 and A2. Consequently, the geometry of the row of teeth of the outer gear ring 34 is also a cylindrical overall geometry surface, this time around the central axis AC.

[0079] However, other complementary geometries can be specified. Therefore, it can be specified that the first drive gear 32.1 and the second drive gear 32.2 are conical gears about their respective axes A1 and A2, each having a conical tooth line about its respective axis A1 and A2. Additionally, in this case, the tooth lines of the outer gear ring 34 and the tooth lines of the intermediate transmission wheel 40 (if present) will also be conical tooth lines.

[0080] In the example shown, the peripheral gear ring 34 is an annular gear ring with a single internal tooth row. The first drive gear 32.1 is a gear including a single external tooth row, which meshes directly with the single internal tooth row of the peripheral gear ring 34. Additionally, in Figures 4 to 6 In this example, the second drive gear 32.2 also has a single external tooth row that directly meshes with a single external tooth row of the first drive gear 32.1. Figures 7 to 9 In the illustrated example, the intermediate drive wheel 40 further includes a single external tooth row that directly meshes with a single external tooth row of the first drive gear 32.1, and the second drive gear 32.2 includes a single external tooth row that directly meshes with a single external tooth row of the intermediate drive wheel 40. The tooth row of a gear ring or gear is single because it is defined by multiple teeth having a single tooth profile. The single tooth row of a gear ring or gear may, for example, have an annular groove around the axis of the gear ring or gear that continuously divides each tooth of the single tooth row into two parts in the direction of extension of the tooth generation curve.

[0081] In the example shown, the tooth rows of the three components are straight tooth rows, with the generatrices of the teeth being straight lines and parallel to the respective axes of the three components, which are themselves parallel to each other. However, these tooth rows can be specified as helical, herringbone, etc., and the teeth can be cylindrical or conical.

[0082] In this example, the second drive gear 32.2 is supported by the upper part of the second drive planetary gear 28.2. Therefore, it is positioned above the planetary gear carrier 26, in this case above the disc plate. Thus, the second drive gear 32.2 is received above the planetary gear carrier 26 in the same protected space as the first drive gear 32.1 and the peripheral gear ring 34, and is therefore not visible from the outside of the food preparation appliance 12.

[0083] According to the application, the food preparation household electrical appliance 12 is of the type in which, for a given speed of the planet carrier 26, the first drive planet gear 28.1 and the second drive planet gear 28.2 rotate respectively about their respective working axes Al, A2, the absolute values of the rotational speeds being different from one another. Preferably, for a given speed of the planet carrier, the second drive planet gear 28.2 rotates about the second working axis A2 at an absolute value of the rotational speed that is greater than the absolute value of the rotational speed of the first drive planet gear 28.1 about the first working axis Al. For example, the second drive gear 32.2, and thus the second drive planet gear 28.2, rotates about the second working axis A2 at an absolute value of the rotational speed that is between 1.1 and 2.0 times the absolute value of the rotational speed of the first drive planet gear about the first working axis Al. This is particularly advantageous because it is then possible to drive the first working tool at a first working speed, or to drive the second working tool at a second working speed that is different, in particular higher, for example between 1.1 and 2.0 times the first working speed, which is the same as the speed of the motor 30 and as the speed of the kinematic chain between the motor and the tool carrier. It is furthermore advantageous that the motor speed is known to be limited on the one hand generally to a minimum value and on the other hand to a maximum value, so that the two different speeds of the two couplings make it possible to extend the ratio of the range of values of the working tools in absolute value. Thus, the first coupling will be used for working tools that require low speeds and possibly high torques, while the second coupling will be used for working tools that require high speeds and possibly lower torques.

[0084] Overall, the food preparation household electrical appliance 12, the first working tool 14.1 and the second working tool 14.2 belong to a food preparation household electrical system 10 comprising a food preparation household electrical appliance 12, at least one first working tool configured to allow it to be coupled to a first coupling of the food preparation household electrical appliance 12, and at least one second working tool configured to allow it to be coupled to a second coupling of the food preparation household electrical appliance 12.

[0085] In a first embodiment, which is more particularly illustrated in Figures 4 to 6 In this embodiment, the first drive gear 32.1 and the second drive gear 32.2 rotate in opposite directions of rotation about their respective axes Al, A2.

[0086] In a second embodiment, which is more particularly illustrated in Figures 7 to 9In the second embodiment shown in the figures, the second drive gear 32.2 is indirectly engaged with the first drive gear 32.1 via an intermediate transmission wheel 40. The intermediate transmission wheel 40 is mounted to rotate freely on the planet carrier 26 about an intermediate axis Ai, which is parallel to the working axes Ai and A2 of the first and second drive gears 32.1 and 32.2, respectively. In this way, the first drive gear 32.1 drives the second drive gear 32.2 and the second drive planet gear 28.2 itself to rotate about the second working axis A2 via the intermediate transmission wheel 40. Preferably, as shown in the figures, the second drive gear 32.2 is indirectly engaged with the first drive gear 32.1 via a single intermediate transmission gear 40, which is a gear having an external toothing directly meshing with the first and second drive gears 32.1 and 32.2. However, it can be provided that the food preparation household appliance 12 comprises a plurality of intermediate wheels arranged in cascade between the first and second drive gears, said intermediate wheels being gears having an external toothing, said intermediate wheels being mounted to rotate freely on the planet carrier. The number of intermediate wheels in cascade is, for example, odd, so that the first and second drive gears 32.1 and 32.2 rotate about their respective working axes Ai, A2 in the same direction of rotation. Figures 7 to 9

[0087] For the embodiment comprising a single intermediate transmission wheel 40, and for the embodiment comprising a plurality of intermediate transmission wheels, the intermediate transmission wheel(s) 40 are coplanar with each other and with the peripheral toothing 34, the first and second drive gears 32.1 and 32.2. In the sense of the present application, the condition is met if there is a plane perpendicular to the central axis AC which intersects the toothing of each peripheral toothing 34, first and second drive gears 32.1 and 32.2 and intermediate transmission wheel 40.

[0088] As shown in the embodiment shown, the second drive gear 32.2 has a plurality of teeth, and thus a diameter different from the first drive gear 32.1, in this case a plurality of pinions. In the embodiment in which the second drive gear 32.2 directly meshes with the first drive gear 32.1, or in the embodiment in which the second drive gear 32.2 is engaged with the first drive gear 32.1 via a single intermediate transmission wheel 40, the ratio of the absolute values of the rotational speeds between the second drive gear 32.2 and the first drive gear 32.1 is inversely proportional to the ratio of the number of teeth of the second drive gear 32.2 with respect to the first drive gear 32.1.

[0089] ​In the example shown, the first work axis Al and the second work axis A2 have the same eccentricity with respect to the central axis AC. It can be said that they are arranged with the same diameter, or that they are arranged at equal distance from the central axis AC. This makes it possible to have a work tool geometry for the first work tool and for the second work tool that is comparable with respect to the geometry of the container. To this end, it is important that the second drive pinion 32.2 has a plurality of teeth, and therefore a diameter that is different from the first drive pinion 32.1, since even if the work axes are arranged with the same eccentricity with respect to the central axis AC, any interference between the second drive pinion 32.2 and the toothed ring 34 is avoided.

[0090] It can however be provided that the first work axis Al and the second work axis A2 have different eccentricities with respect to the central axis AC, for example the second work axis A2 has a smaller eccentricity with respect to the AC axis than the first work axis Al. With this arrangement, for the same work container, it is possible to obtain a second work tool 14.2 with a greater diameter, thus benefiting from a greater tangential speed of the work tool at the same rotational speed around the work axis A2.

[0091] In certain embodiments, the first coupling 30.1 and the second coupling 30.2 can have the same work tool coupling geometry. In this case, it is conceivable that the same work tool can be mounted indifferently on the first coupling 30.1, and therefore on the first drive planetary gear 28.1, or on the second coupling 30.2, and therefore on the second drive planetary gear 28.2.

[0092] However, it can be advantageously provided that the first coupling 30.1 and the second coupling 30.2 have a first and a second work tool coupling geometry, respectively, which are different from each other.

[0093] Different geometries of the coupling between the work tool and the food preparation household appliance 12 are in fact known. The coupling geometry determines the coupling mechanism, which has the function of fixing the work tool to the drive planetary gear in conditions that can allow the work tool to perform the food preparation work for which it is designed. Typically, the coupling geometry allows the work tool to be locked in all directions with respect to the coupling. For example, coupling geometries are known that define a bayonet-type coupling mechanism. Coupling geometries are also known that define a coupling mechanism comprising a stem formed as part of the work tool or as part of the coupling, which is a stem with a prismatic face or a notched stem or a stem with one or more radial protrusions, and on the other of the work tool and the coupling a bore with a complementary shape. Typically, the coupling geometry defines a coupling mechanism that allows the work tool to be coupled and uncoupled on the coupling manually, therefore without the need to use a tool to achieve the coupling.

[0094] By using different connection geometries for the first connector 30.1 and the first working tool 14.1 on the one hand, and for the second connector 30.2 and the second working tool 14.2 on the other hand, the connection geometry can be adapted to the various operations preset for the two working tools, especially the torque of the force applied to the working tool and thus to the connector during the operation.

[0095] Specifically, it can be advantageously specified that the first connector 30.1 is configured to prevent the connection of the second working tool 14.2 and / or the second connector 30.2 is configured to prevent the connection of the first working tool 14.1. Note that it is possible to prevent the first working tool 14.1 from being mounted on the second connector 30.2, without necessarily preventing the second working tool 14.2 from being mounted on the first connector 30.1, and vice versa.

[0096] Advantageously, the food preparation appliance system 10 can be configured to prevent simultaneous mounting of a first working tool 14.1 on a first connector 30.1 and a second working tool 14.2 on a second connector 30.2. For example, such a food preparation appliance system 10 may include a cover that is mounted to be movable between two positions on a planetary gear carrier, wherein in one position the cover will allow access to the first connector and prevent access to the second connector, while in another position it will allow access to the second connector and prevent access to the first connector. Alternatively, such a food preparation appliance system 10 may include a cover that is attached to the working tool and, when the working tool is connected to the corresponding connector, the cover will prevent access to the other connector.

[0097] Preferably, the first working axis A1 and the second working axis A2 are spaced apart from each other around the central axis AC by an angle less than or equal to 180 degrees, more preferably less than or equal to 120 degrees, and even more preferably less than or equal to 90 degrees. In the first example shown—where the second drive gear 32.2 directly meshes with the first drive gear 32.1 without intermediate mechanical components—the first working axis A1 and the second working axis A2 are spaced apart from each other around the central axis AC by an angle strictly less than or equal to 45 degrees. In the second example shown—where the second drive gear 32.2 indirectly engages with the first drive gear 32.1 via an intermediate transmission wheel 40—the first working axis A1 and the second working axis A2 are spaced apart from each other around the central axis by an angle ranging from 45 degrees to 90 degrees.

[0098] For embodiments including one or more intermediate drive wheels 40, the intermediate drive wheels 40 can be arranged such that their rotation axis Ai has the same eccentricity relative to the central axis AC as the first working axis A1 and the second working axis A2, as inFigures 7 to 9 In embodiments, the rotation axis Ai of the intermediate transmission wheel 40 is arranged at an eccentricity with respect to the central axis AC which is different from the eccentricity of the first working axis A1 and of the second working axis A2. For example, it can be provided that the intermediate transmission wheel 40 is arranged so that its rotation axis Ai has a smaller eccentricity with respect to the central axis AC than the eccentricity of the first working axis A1 and optionally also than the eccentricity of the second working axis A2. By arranging the intermediate transmission wheel 40 radially inward with respect to the first drive gear 32.1 and with respect to the second drive gear 32.2, for the same wheel diameter, it is possible to angle the first drive gear 32.1 and the second drive gear 32.2 closer together, the angular spacing between the first working axis A1 and the second working axis A2 around the central axis AC is reduced, which angular spacing can then be less than 45 degrees.

[0099] By combining two couplings together in the same angular sector of the planetary gear carrier 26, for example the first working axis A1 and the second working axis A2 have an angular spacing around the central axis AC which is less than 90 degrees, even less than 45 degrees, it is possible to arrange them in the same reinforced sector of the planetary gear carrier 26.

[0100] The present application makes it possible to produce a food preparation household appliance comprising two output couplings which can in particular have different rotation speeds, this being achieved by simply changing the planetary gear carrier 26, without other modifications being necessary to existing equipment comprising a single output coupling on its planetary gear carrier. In fact, in both cases, the planetary gear carrier comprises a single drive gear which meshes directly with the peripheral ring gear.

Claims

1. A food preparation household appliance (12), comprising: ● Base (15), the base having a base (16) having a receiving area (17) configured to receive a work container (20); ● A head (22) connected to the base (15), the head (22) having a planetary gear carrier (26), the planetary gear carrier being driven by a motor (30) to rotate about a central axis (AC), and carrying: ■ A first drive planetary gear (28.1), mounted to rotate freely on a planetary gear carrier (26) about a first working axis (A1) parallel to and eccentric relative to the central axis (AC), the first drive planetary gear (28.1) comprising: ◇A first connector (30.1) configured to allow the connection and disconnection of a first working tool (14.1) and drive the first working tool (14.1) to rotate about a first working axis (A1) relative to the planetary gear carrier (26), the first connector (30.1) being arranged opposite to the receiving area (17); ◇The first drive gear (32.1) has its axis as the first working axis (A1). The first drive gear rotates integrally with the first drive planetary gear (28.1) and engages with the inner tooth row of the outer gear ring (34) with the central axis (AC) as the axis of symmetry. It is used to make the first drive planetary gear (28.1) rotate around the first working axis (A1) during the differential rotation of the planetary gear carrier (26) relative to the outer gear ring (34). ■ A second drive planetary gear (28.2), separate from the first drive planetary gear (28.1), is mounted to rotate freely on the planetary gear carrier (26) about a second working axis (A2), the second working axis (A2) being parallel to and eccentric relative to the central axis (AC), but different from the first working axis (A1). The second drive planetary gear (28.2) includes: ◇A second connector (30.2) configured to allow the connection and disconnection of the second working tool (14.2) and drive the second working tool (14.2) to rotate about the second working axis (A2) relative to the planetary gear carrier (26), the second connector (30.2) being arranged opposite to the receiving area (17); ◇The second drive gear (32.2) has its axis as the second working axis (A2) and rotates integrally with the second drive planetary gear (28.2); The food preparation household appliance (12) is of the type in which, for a given rotational speed of the planetary gear carrier (26), the first driving planetary gear (28.1) and the second driving planetary gear (28.2) rotate about their respective working axes (A1, A2) at rotational speeds that are different from each other in absolute value. The feature is that the second drive gear (32.2) cooperates with the first drive gear (32.1) such that the first drive gear (32.1) drives the second drive gear (32.2) and the second drive planetary gear (28.2) to rotate around the second working axis (A2), and the outer gear ring (34), the first drive gear (32.1) and the second drive gear (32.2) are coplanar, and the first connector (30.1) and the second connector (30.2) have different first working tool connection geometry and second working tool connection geometry from each other.

2. The food preparation household appliance (12) according to claim 1, characterized in that, The first drive gear (32.1) meshes directly with the outer gear ring (34) without any intermediate mechanical components.

3. The food preparation household appliance (12) according to claim 1, characterized in that, The second drive planetary gear (28.2) rotates around the second working axis (A2) at a rotational speed whose absolute value is greater than the absolute value of the rotational speed of the first drive planetary gear (28.1) around the first working axis (A1), which is 1.1 to 2.0 times the rotational speed of the first drive planetary gear (28.1) around the first working axis (A1).

4. The food preparation household appliance (12) according to claim 3, characterized in that, The first drive gear (32.1) meshes directly with the outer gear ring (34) without any intermediate mechanical components.

5. The food preparation household appliance (12) according to any one of claims 1 to 4, characterized in that, The second drive gear (32.2) meshes directly with the first drive gear (32.1) without any intermediate mechanical components.

6. The food preparation household appliance (12) according to any one of claims 1 to 4, characterized in that, The second drive gear (32.2) engages indirectly with the first drive gear (32.1) via at least one intermediate drive wheel (40), which is mounted on a planetary gear carrier (36) and is rotatable, such that the first drive gear (32.1) drives the second drive gear (32.2) to rotate and the second drive planetary gear (28.2) itself rotates about the second working axis (A2), which is done via the at least one intermediate drive wheel (40).

7. The food preparation household appliance (12) according to claim 6, characterized in that, The second drive gear (32.2) indirectly engages with the first drive gear (32.1) through a single intermediate transmission wheel (40), which directly meshes with the first drive gear (32.1) and simultaneously directly meshes with the second drive gear (32.2).

8. The food preparation household appliance (12) according to any one of claims 1 to 4, characterized in that, The second drive gear (32.2) has a different number of teeth than the first drive gear (32.1).

9. The food preparation household appliance (12) according to any one of claims 1 to 4, characterized in that, The number of teeth of the second drive gear (32.2) is less than the number of teeth of the first drive gear (32.1), such that for a given speed of the planetary gear carrier (26), the absolute value of the rotational speed of the second drive planetary gear (28.2) about the second working axis (A2) is greater than the absolute value of the rotational speed of the first drive planetary gear (28.1) about the first working axis (A1).

10. The food preparation household appliance (12) according to any one of claims 1 to 4, characterized in that, The first drive gear (32.1) and at least one intermediate transmission wheel (40) when present have a single external tooth row.

11. The food preparation household appliance (12) according to any one of claims 1 to 4, characterized in that, The first working axis (A1) and the second working axis (A2) have the same eccentricity relative to the central axis (AC).

12. A food preparation appliance system (10), comprising: ● Household food preparation appliance (12) according to any one of claims 1 to 11; ● A first working tool (14.1) is configured to allow it to be connected to a first connector (30.1) of a food preparation household appliance (12); ● A second working tool (14.2) is configured to allow it to be connected to a second connector (30.2) of a food preparation household appliance (12).

13. The food preparation appliance system (10) according to claim 12, characterized in that, The second working tool (14.2) is configured to prevent it from being connected to the first connector (30.1).

14. The food preparation appliance system (10) according to claim 12, characterized in that, The first working tool (14.1) is configured to prevent it from being connected to the second connector (30.2).

15. The food preparation appliance system (10) according to claim 14, characterized in that, The second working tool (14.2) is configured to prevent it from being connected to the first connector (30.1).

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