阅读说明：本技术 具有共面驱动的食物制备家电系统和器具 (Food preparation appliance system and appliance with coplanar drive ) 是由 斯特凡·雷特尔 米歇尔·莱莫西埃 斯特凡·布劳诺 于 2021-05-17 设计创作，主要内容包括：本发明涉及一种食物制备家用电器,具有：第一驱动行星齿轮(28.1),其包括用于第一作业工具的第一联接器,以及与外围齿圈(34)的外齿列配合的第一驱动齿轮(32.1)；第二驱动行星齿轮(28.2),其包括用于第二作业工具的第二联接器,以及第二驱动齿轮(32.2),其特征在于,第二驱动齿轮(32.2)与第一驱动齿轮(32.1)配合,以驱动第二驱动齿轮(32.2)和第二驱动行星齿轮(28.2)自身围绕第二作业轴线(A2)旋转,并且外围齿圈(34)、第一驱动齿轮(32.1)和第二驱动齿轮(32.2)是共面的。(The invention relates to a food preparation household appliance, comprising: a first drive planetary gear (28.1) comprising a first coupling for a first work tool, and a first drive gear (32.1) cooperating with the external toothing of the peripheral ring gear (34); -a second drive planet gear (28.2) comprising a second coupling for a second work tool, and-a second drive gear (32.2), characterised 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 planet gear (28.2) to rotate on themselves about a second work axis (a2), and in that the peripheral ring gear (34), the first drive gear (32.1) and the second drive gear (32.2) are coplanar.)

1. A food preparation household appliance (12) comprising:

● a base (15) having a base (16), the base (16) having a receiving area (17) configured to receive a work container (20);

● is connected to the head (22) of the base (15), the head (22) having a planet carrier (26) which is driven in rotation about a central Axis (AC) by a motor (30) and carries:

■ a first drive planet gear (28.1) mounted for free rotation on the planet carrier (26) about a first working axis (A1) parallel to and eccentric with respect to the central Axis (AC), the first drive planet gear (28.1) comprising:

-a first coupling (30.1) configured to allow coupling and uncoupling of a first work tool (14.1) and to drive the first work tool (14.1) in rotation relative to the planet carrier (26) about a first work axis (a1), the first coupling (30.1) being arranged opposite the receiving region (17);

-a first driving gear (32.1) whose axis is a first working axis (a1), which rotates integrally with the first driving planet gears (28.1) and cooperates with the internal toothing of the peripheral ring gear (34) with the central Axis (AC) as axis of symmetry, for rotating the first driving planet gears (28.1) themselves about the first working axis (a1) during the differential rotation of the planet carrier (26) with respect to the peripheral ring gear (34);

■ second drive planet gears (28.2) separate from the first drive planet gears (28.1) and mounted to rotate freely on the planet carrier (26) about a second working axis (A2), the second working axis (A2) being parallel to and eccentric with respect to the central Axis (AC), but different from the first working axis (A1), the second drive planet gears (28.2) comprising:

-a second coupling (30.2) configured to allow coupling and uncoupling of a second work tool (14.2) and to drive the second work tool (14.2) in rotation relative to the planet carrier (26) about a second work axis (a2), the second coupling (30.2) being arranged opposite the receiving area (17);

-a second driving gear (32.2) having an axis of a second working axis (a2) and rotating integrally with the second driving planetary gear (28.2);

the food preparation household appliance (12) is of the type: wherein for a given rotational speed of the planet carrier (26), the first drive planet gear (28.1) and the second drive planet gear (28.2) rotate about their respective working axes (a1, a2) at rotational speeds that differ from each other in absolute value;

characterised in that the second drive gear (32.2) is in mesh with the first drive gear (32.1) so that the first drive gear (32.1) drives the second drive gear (32.2) and the second drive planet gears (28.2) themselves in rotation about the second working axis (a2), and the peripheral ring gear (34), the first drive gear (32.1) and the second drive gear (32.2) are coplanar.

2. 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) with a rotational speed which is greater in absolute value than the absolute value of the rotational speed of the first drive planetary gear (28.1) around the first working axis (a1), for example 1.1 to 2.0 times the rotational speed of the first drive planetary gear (28.1) around the first working axis (a 1).

3. Food preparation household appliance (12) according to claim 1 or 2, characterized in that the first driving gear (32.1) meshes directly with the peripheral ring gear (34) without intermediate mechanical elements.

4. Food preparation household appliance (12) according to any of claims 1 to 3, characterized in that the second driving gear (32.2) is directly meshed with the first driving gear (32.1) without intermediate mechanical elements.

5. Food preparation household appliance (12) according to any of claims 1 to 3, characterized in that said second driving gear (32.2) is indirectly coupled with said first driving gear (32.1) through at least one intermediate transmission wheel (40), said intermediate transmission wheel (40) being mounted freely rotatable on the planet carrier (36), so that the first driving gear (32.1) drives the second driving gear (32.2) in rotation and the second driving planet gears (28.2) themselves rotate about the second working axis (A2), which is carried out through said at least one intermediate transmission wheel (40).

6. Food preparation household appliance (12) according to claim 5, characterized in that the second driving gear (32.2) is indirectly mated with the first driving gear (32.1) through a single intermediate transmission wheel (40), said single intermediate transmission wheel (40) being directly meshed with the first driving gear (32.1) and simultaneously directly meshed with the second driving gear (32.2).

7. Food preparation household appliance (12) according to any of claims 1 to 6, characterized in that the second driving gear (32.2) has a different number of teeth than the first driving gear (32.1).

8. Food preparation household appliance (12) according to any one of claims 1 to 7, characterized in that the number of teeth of the second driving gear (32.2) is smaller than the number of teeth of the first driving gear (32.1), so that for a given speed of the planet carrier (26), the absolute value of the speed of rotation of the second driving planet gears (28.2) around the second working axis (A2) is greater than the absolute value of the speed of rotation of the first driving planet gears (28.1) around the first working axis (A1).

9. Food preparation household appliance (12) according to any of claims 1 to 8, characterized in that the first driving gear (32.1) and, if present, the at least one intermediate transmission wheel (40) have a single outer row of teeth.

10. Food preparation household appliance (12) according to any one of claims 1 to 9, characterized in that the first working axis (a1) and the second working axis (a2) have the same eccentricity with respect to the central Axis (AC).

11. Food preparation household appliance (12) according to any of claims 1 to 10, characterized in that the first and second couplers (30.1, 30.2) have a first and second work tool coupling geometry, respectively, which are different from each other.

12. A food preparation appliance system (10) comprising:

● the food preparation household appliance (12) according to any one of claims 1 to 11;

● a first work tool (14.1) configured to allow it to be coupled to a first coupling (30.1) of a food preparation household appliance (12);

● second work tool (14.2) configured to allow it to be coupled to a second coupling (30.2) of a food preparation household appliance (12).

13. A food preparation appliance system (10) according to claim 12, wherein the first work tool (14.1) is configured to inhibit its coupling to the second coupling (30.2).

14. The food preparation household appliance system (10) according to claim 12 or 13, characterized in that the second work tool (14.2) is configured to inhibit its coupling to the first coupling (30.1).

15. The food preparation appliance system (10) according to any one of claims 12 to 14, wherein the first coupler (30.1) is configured to inhibit coupling of the second work tool (14.2) and/or the second coupler (30.2) is configured to inhibit coupling of the first work tool (14.1).

Technical Field

The present invention relates to the general technical field of food preparation household appliances comprising a base for receiving a work container, such as a tank, and comprising a head fixed to the base, said head comprising a planet gear carrier for driving a work tool, said planet gear carrier being driven in rotation about a central axis by a motor.

Background

In conventional food preparation household appliances of the above type, the planet gear carrier usually comprises an eccentric coupling which allows driving the work tool above the base according to a planetary gear movement which combines two rotations about two parallel axes. Such an appliance may be used with different work tools alternately mounted on the same coupling, said work tools being suitable for different cooking operations. These appliances are commonly referred to as "pastry robots", although they may generally be used for preparation tasks other than baking.

For example, work tools of the "dough mixer" type are known, which typically include one or more rigid arms to allow dough to mix in the work vessel.

Work tools of the "eggbeater" type are also known, which generally comprise one or more thin strands, which can be used to emulsify the preparation contained in the work container.

In a pastry robot, the planet gear carrier is typically driven to rotate at a relatively low speed, for example 40 to 250 revolutions per minute. Lower speeds are well suited for certain cooking operations and therefore for certain work tools used for such operations, for example for "dough mixer" type work tools. However, certain cooking operations and work tools dedicated to them require, and even benefit from, higher rotational speeds of the work tools. This is the case, for example, with work tools of the "whisk" type.

From document GB 245748, for example, a food preparation household appliance is also known, which is intended to be able to drive two types of work tools of different types, which are intended to be optimally carried out at different speeds. The appliance comprises:

● a base having a base with a receiving area configured to receive a work container;

● are connected to the head of the base, the head having a planet carrier which is driven in rotation about a central axis by a motor and carries:

■ a first drive planetary gear mounted for free rotation on the planet carrier about a first working axis parallel to and eccentric with respect to the central axis, the first drive planetary gear comprising:

a first coupling configured to allow coupling and uncoupling of a first work tool and to drive the first work tool in rotation relative to the planet carrier about a first work axis, the first coupling being arranged opposite the receiving area;

a first drive gear whose axis is a first working axis, the first drive gear rotating integrally with the first drive planetary gear and cooperating with the internal tooth train of the peripheral ring gear with the central axis as an axis of symmetry for rotating the first drive planetary gear itself about the first working axis during differential rotation of the planet carrier relative to the peripheral ring gear;

■ a second drive planet gear spaced from the first drive planet gear and mounted for free rotation on the planet carrier about a second working axis parallel to and eccentric to the central axis but different from the first working axis, the second drive planet gear comprising:

a second coupling configured to allow coupling and decoupling of a second work tool and to drive the second work tool to rotate relative to the planet carrier about a second work axis, the second coupling being arranged opposite the receiving area;

and a second drive gear having an axis which is a second working axis and rotating integrally with the second drive planetary gear.

In this example, the second drive gear meshes with a second peripheral ring gear having the central axis as the axis of symmetry to drive the second drive planet gears to rotate themselves about the second working axis.

The two ring gears overlap in the direction of the central axis and one of them has a conical tooth row, which is complicated to realize and results in a large volume in the direction of the central axis.

Disclosure of Invention

It is an object of the present invention to provide a food preparation domestic appliance providing a first and a second work tool coupling, which rotate about their respective work axes, respectively, at rotational speeds which differ from each other in absolute value, while maintaining a simple, compact structure and without requiring major modifications to the architecture of existing appliances.

To this end, the invention provides a food preparation household appliance comprising:

● a base having a base with a receiving area configured to receive a work container;

● are connected to the head of the base, the head having a planet carrier which is driven in rotation about a central axis by a motor and carries:

a first drive planetary gear mounted for free rotation on the planet carrier about a first working axis parallel to and eccentric relative to the central axis, the first drive planetary gear comprising:

● a first coupling configured to allow coupling and decoupling of and drive rotation of a first work tool relative to the planet carrier about a first work axis, the first coupling being disposed opposite the receiving area;

● a first drive gear whose axis is a first working axis, the first drive gear rotating integrally with the first drive planet gear and cooperating with the internal tooth row of the peripheral ring gear with the central axis as the axis of symmetry for rotating the first drive planet gear itself about the first working axis during differential rotation of the planet carrier relative to the peripheral ring gear;

a second drive planetary gear separate from the first drive planetary gear and mounted for free rotation on the planet carrier about a second working axis parallel to and eccentric with respect to the central axis but different from the first working axis, the second drive planetary gear comprising:

● a second coupling configured to allow coupling and decoupling of a second work tool and to drive the second work tool in rotation relative to the planet carrier about a second work axis, the second coupling being arranged opposite the receiving area;

● and a second drive gear whose axis is a second working axis and which rotates integrally with the second drive planetary gear.

The food preparation household appliance is of the type: wherein for a given rotational speed of the planet carrier, the first and second drive planet gears each rotate about their respective working axes at rotational speeds that differ from each other in absolute value.

The food preparation household appliance is characterized in that the second driving gear cooperates with the first driving gear such that the first driving gear drives the second driving gear and the second driving planetary gears themselves in rotation about the second working axis, and the peripheral toothed ring, the first driving gear and the second driving gear are coplanar.

The food preparation household appliance may further comprise one or another of the following features, alone or in combination.

In certain embodiments, the second drive planet gear rotates about the second working axis at a rotational speed that is greater in absolute value than the rotational speed of the first drive planet gear about the first working axis, for example 1.1 to 2.0 times the rotational speed of the first drive planet gear about the first working axis.

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

In certain embodiments, the second drive gear directly engages the first drive gear without an intermediate mechanical element.

In certain embodiments, the second drive gear is indirectly engaged with the first drive gear by at least one intermediate transfer wheel freely rotatably mounted on the planet carrier such that the first drive gear drives the second drive gear in rotation and the second drive planet gear itself rotates about the second working axis, which is done by the at least one intermediate transfer wheel.

In certain embodiments, the second drive gear indirectly mates with the first drive gear through a single intermediate drive wheel that directly meshes with the first drive gear and simultaneously directly meshes with the second drive gear.

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

In certain embodiments, the number of teeth of the second drive gear is less than the number of teeth of the first drive gear such that, for a given speed of the planet carrier, the absolute value of the rotational speed at which the second drive planet gears rotate about the second working axis is greater than the absolute value of the rotational speed at which the first drive planet gears rotate about the first working axis.

In certain embodiments, the first drive gear and the at least one intermediate drive wheel (if present) have a single outer tooth row. Thus, without the intermediate drive wheel, the single outer row of teeth of the first drive gear is driven by the peripheral annulus gear and drives the second drive gear. Thus, in the presence of at least one intermediate transmission wheel, the single outer row of teeth of the first drive gear is driven by the peripheral ring gear and drives one or more intermediate transmission wheels. When there is only one intermediate drive wheel, the outer tooth rows of the intermediate drive wheel are driven by the peripheral ring gear and drive the second drive gear. When there are a plurality of intermediate transmission wheels, the outer tooth row 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.

In certain embodiments, the peripheral ring gear is a ring gear having a single inner row of teeth, the first drive gear is a gear comprising a single outer row of teeth that directly meshes with the inner row of teeth of the peripheral ring gear, and the second drive gear has an outer row of teeth that directly meshes with the outer row of teeth of the first drive gear.

In certain embodiments, the first working axis and the second working axis have the same eccentricity relative to the central axis.

In certain embodiments, the first and second couplers have first and second work tool coupling geometries, respectively, that are different from one another.

The invention also relates to a food preparation appliance system comprising:

■ a food preparation domestic appliance having any one of the preceding features;

■ a first work tool configured to allow it to be coupled to a first coupler of a food preparation appliance;

■ a second work tool configured to allow it to be coupled to a second coupling of a food preparation domestic appliance.

In such a food preparation appliance system, the first work tool may be configured to inhibit its coupling to the second coupling and/or the second work tool may be configured to inhibit its coupling to the first coupling.

In such a food preparation appliance system, the first coupler may be configured to inhibit coupling of the second work tool and/or the second coupler may be configured to inhibit coupling of the first work tool.

Such a food preparation appliance system may be configured to prevent simultaneous mounting of one work tool on the first coupling and another work tool on the second coupling.

Drawings

Fig. 1 is a general schematic perspective view of a food preparation household appliance in which the present invention may be implemented.

Fig. 2 is a schematic partial side view of a portion of a food preparation household appliance in which the present invention may be implemented.

Fig. 3 is a schematic partial perspective view of a portion of a food preparation domestic appliance comprising two couplings for two work tools.

Fig. 4 is a schematic perspective view showing a peripheral ring gear and a planet carrier having two driving planet gears according to a first embodiment of the present invention.

Fig. 5 is a schematic exploded perspective view showing a planet carrier similar to fig. 4 with two drive planet gears.

Fig. 6 is a schematic top view of the element of fig. 4.

Fig. 7 is a view similar to fig. 4 showing a second embodiment of the invention.

Fig. 8 is a view similar to fig. 5 showing a second embodiment of the invention.

Fig. 9 is a view similar to fig. 6 showing a second embodiment of the invention.

Detailed Description

Fig. 1 to 3 show a household food preparation appliance system 10 comprising, on the one hand, a food preparation household appliance 12 of the pastry robot type, and, on the other hand, a first work tool 14.1 and a second work tool 14.2 to be mounted on the food preparation household appliance 12, for acting on food products during the food preparation process. In the following example, the first work tool 14.1 is for example a dough mixing tool, and the second work tool 14.2 is for example an eggbeater. In general, the first work tool 14.1 and the second work tool 14.2 are two different types of work tools having different geometries, in particular at the active surfaces of the work tools, which are intended to act on the food product during the food preparation process for which the food product is intended. The two tools are preferably designed to be used optimally with different rotational speeds about their working axes.

The food preparation household appliance 12 comprises a base 15, here in the form of a foot, comprising 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, which receiving area 17 is configured to receive a work container 20, here in the form of a tank, which is typically removable. The work container 20 is removably mounted on the receiving area 17 of the base 16, for example by means of a bayonet connection. The food preparation household appliance 12 further comprises a head 22, in this example the head 22 being hinged on the base 15 about a horizontal axis a0, here at the level of the legs 18. With the head 22 articulated about the 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 in particular a work position shown in fig. 1. The concepts of "horizontal", "vertical", "up" and "down" and the resulting concept of orientation refer to the normal orientation of the food preparation home appliance 12 in an operational state when the base 15 is placed on a horizontal work surface and corresponds to that shown.

The head 22 of the food preparation household appliance 12 has a shape extending horizontally in longitudinal direction in the working position, with a rear longitudinal portion, by which it is connected with the legs 18 of the base 15, and a front longitudinal portion, which extends overhanging over the base 16 and the work container 20. The head 22 may contain a motor 30, preferably an electric motor, as shown in fig. 2, the activation and speed of which may be controlled, for example, by means of control buttons 24 arranged 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 may be horizontal or vertical, in particular, depending on the design. Alternatively, the motor 30 may be arranged in particular in the base 15.

In a manner known per se, the front longitudinal portion of the head 22 comprises a planet carrier 26, which planet carrier 26 comprises means for driving the first work tool 14.1 and even the second work tool 14.2 in a planetary motion. For this purpose, the planet carrier 26 is rotationally movable about a central axis AC. In the example shown, the central axis AC is fixed relative to the head 22. The planet gear carrier 26 is driven by an electric motor 30 via a kinematic chain 25, according to a design well known to the person skilled in the art. Each of the first and second work tools 14.1, 14.2 is intended to be mounted on the planet carrier 26 to be driven into working motion by the planet carrier 26. In the working position, the first work tool 14.1 or the second work tool 14.2 mounted on the planet carrier 26 is engaged within the work container 20 to act on the food product contained in the work container 20.

In the example shown, the planet gear carrier 26 is made in the form of a disk-shaped plate. The carrier 26 is integrally mounted with the lower end of a drive shaft 27 whose axis is the central axis AC. A drive shaft 27 is received in the head 22 and guided inside the head 22 for rotation about a central axis AC. The drive shaft 27 carries a drive wheel 29 which forms part of the kinematic chain 25 by means of which the planet carrier 26 is driven by an electric motor 30. The drive wheel 29 is arranged here on the upper part of a drive shaft 27 which extends, for example, over an inner horizontal wall (not shown) by means of which the drive shaft 27 of the planet carrier can be guided in rotation.

The planet carrier 26 carries a first drive planet gear 28.1 which is mounted to rotate freely on the planet carrier 26 about a first working axis a1 parallel to and eccentric with respect to the central axis AC.

In the example shown, as can be seen in particular in fig. 5 to 8, the first drive planet gear 28.1 comprises a rod 31.1 extending along a first working axis a1, this rod 31.1 being mounted so as to be rotatable by a disk-shaped plate forming the planet carrier 26. Thus, the first drive planet gears 28.1 comprise a lower part protruding below the lower surface of the planet gear carrier 26 and thus facing the receiving area 17, and an upper part protruding above the top surface of the planet gear carrier 26. Thus, in the example shown, the upper part of the first drive planet gears 28.1 extends in a protected space above the planet gear carrier 26, which can be considered to be comprised in the head 22.

The first drive planet gear 28.1 comprises a first coupling 30.1, the first coupling 30.1 being configured to allow coupling and decoupling of the first work tool 14.1 on the first drive planet gear 28.1 in the working configuration and to ensure that the first work tool 14.1 is driven in rotation relative to the planet carrier 26 about the working axis a 1. The first coupling 30.1 is arranged opposite the receiving area 17. In the example shown, the first coupling 30.1 is arranged at the lower end of the lever 31.1 of the first drive planet gear 28.1, thus below the planet gear carrier 26.

The first drive planet gear 28.1 also includes a first drive gear 32.1, which first drive gear 32.1 has the first working axis a1 as its axis and rotates integrally with the first drive planet gear 28.1. In the example, this is due to the fact that it is mounted integrally with the rod 31.1. In a known manner, the first driving gear 32.1 cooperates with the internal toothing of the peripheral ring gear 34, with the central axis AC as axis of symmetry, to rotate the first driving planet gears 28.1 themselves about the first working axis a1 during the differential rotation of the planet carrier 26 with respect to the peripheral ring gear 34.

In the example shown, the first drive gearwheel 32.1 meshes directly with the internal tooth row of the peripheral ring gearwheel 34, and therefore there are no intermediate mechanical elements. However, provision can be made for the first drive gearwheel 32.1 to engage indirectly, for example via an intermediate gearwheel, with the internal toothing of the peripheral ring gearwheel 34.

In the example shown, the peripheral ring gear 34 is fixed relative to the head 22, but it may be provided that the peripheral ring gear 34 is driven in rotation relative to the head 22 about the central axis AC, in particular in a direction opposite to the direction in which the planet carrier 26 rotates about the central axis AC.

In the example shown, a first drive gear 32.1 is carried by an upper portion of the first drive planet gear 28.1. It is therefore arranged above the planet gear carrier 26, in this case above the disk plate. Thus, the first driving gear 32.1 is received in a protected volume above the planet gear carrier 26 and is not visible from the outside of the food preparation household appliance 12.

In the example shown, peripheral gear ring 34 is carried by head 22 and is fixed relative to head 22. It is arranged directly above the planet gear carrier 26, in this case in a protected volume above the planet gear carrier 26. In the example shown, the peripheral ring gear 34 has substantially the same dimensions as the planet carrier 26 in a direction diametrically opposite the central axis AC.

The planet carrier 26 carries a second drive planet gear 28.2 which is separate from the first drive planet gear 28.1. The second drive planet gears 28.2 are also mounted for free rotation on the planet gear carrier 26 about a second working axis a2 which is also parallel to and eccentric with respect to the central axis AC. The second working axis a2 is different from the first working axis a 1.

In the example shown, the second drive planet gear 28.2 comprises a rod 31.2 extending along the second working axis a2 and mounted for rotation by a disk-shaped plate forming the planet carrier 26. The second drive planet gears 28.2 thus comprise a lower part which projects below the lower surface of the planet gear carrier 26 and thus faces the receiving region 17, and an upper part which projects above the top surface of the planet gear carrier 26. Thus, in the example shown, the upper part of the second drive planet gears 28.2 extend above the planet gear carrier 26 in the same protected volume as the upper part of the first drive planet gears 28.1.

Similar to the first drive planet gear 28.1, the second drive planet gear 28.2 includes a coupling, referred to herein as a second coupling 30.2, configured to allow coupling and decoupling of the second work tool 14.2 on the second drive planet gear 28.2 in the working configuration and for driving the second work tool 14.2 to rotate relative to the planet carrier 26 about a second working axis a 2. The second coupling 30.2 is arranged opposite the receiving area 17. In the example shown, the second coupling 30.2 is also arranged at the lower end of the lever 31.2 of the second drive planet gear 28.2, thus below the planet gear carrier 26.

Likewise, the second drive planetary gear 28.2 includes a second drive gear 32.2, which second drive gear 32.2 has the second working axis a2 as its axis and rotates integrally with the second drive planetary gear 28.2. In the example, this is due to the fact that it is mounted integrally with the rod 31.2.

As can be seen from fig. 4 to 9, the second drive gearwheel 32.2 cooperates with the first drive gearwheel 32.1 directly or via at least one intermediate transmission wheel 40, so that the first drive gearwheel 32.1 drives the second drive gearwheel 32.2 and the second drive planet gearwheel 28.2 itself rotates about the second working axis a 2.

It should therefore be noted that the second drive gear 32.2 does not engage directly with the peripheral ring gear 34 in the sense that it does not engage directly with the tooth rows of the peripheral ring gear 34. The cascade drive makes it possible to simplify the construction, in particular to simplify the geometric tolerances of the components and assemblies. In practice, the first drive gear 32.1 and the second drive gear 32.2 are carried by the same component, namely the planet carrier 26, while each is mounted to rotate on this planet carrier 26 independently of the other. The dimensional chain to be observed in order to obtain a fitting ensuring driving with each other is relatively short and can therefore be easily observed during manufacture and assembly, without the need to take design and manufacturing precautions which are expensive to implement. On the other hand, the direct engagement between the peripheral ring gear 34 and the first drive gear 32.1 is more complicated to achieve, since this involves the planet carrier 26, which planet carrier 26 is both a (rotationally) movable component relative to the peripheral ring gear 34 and relative to the first drive gear 32.1. Consequently, the dimensional chain to be observed is longer, which implies more manufacturing and assembly constraints, thus inevitably resulting in higher implementation costs. Thus, the longer dimension chain is not present at the second drive gear 32.2.

Furthermore, the peripheral ring gear 34, the first drive gear 32.1, the second drive gear 32.2 are coplanar, as can be seen in particular in fig. 4 and 7. For embodiments without the intermediate transmission wheel 40, the peripheral ring gear 34, the first drive gear 32.1 and the second drive gear 32.2 are coplanar, as shown in particular in fig. 4. This makes it possible to obtain a particularly compact food preparation household appliance 12, in particular in the direction of the central axis AC. In the sense of the present application, this condition is fulfilled if there is a plane perpendicular to the central axis AC, which plane intersects the tooth rows of each peripheral ring gear 34, first drive gear 32.1 and second drive gear 32.2. For the example comprising at least one intermediate transmission wheel 40, peripheral toothing 34, first driving gear 32.1, said at least one intermediate transmission wheel 40 and second driving gear 32.2 are coplanar, as shown in particular in figure 7. This makes it possible to obtain a particularly compact food preparation household appliance 12, in particular in the direction of the central axis AC. In the sense of the present application, this condition is satisfied if there is a plane perpendicular to the central axis AC, which plane intersects the rows of teeth of each peripheral ring gear 34, first drive gear 32.1, the at least one intermediate transmission wheel 40 and second drive gear 32.2. When there are a plurality of intermediate transmission wheels 40, the central axis AC intersects the tooth row of each intermediate transmission wheel 40.

Note that the peripheral ring gear 34, the first drive gear 32.1 and the second drive gear 32.2 are all arranged above the planet carrier 26.

In the example, the first drive gear 32.1 and the second drive gear 32.2 are gears of cylindrical geometry about their respective axes a1, a 2. Thus, they each have a row of teeth of cylindrical overall geometry about their respective axes a1, a 2. Thus, the geometry of the rows of teeth of peripheral ring gear 34 is also a cylindrical surface of overall geometry, this time about central axis AC.

However, other complementary geometries may be specified. Thus, it can be provided that the first drive gear 32.1 and the second drive gear 32.2 are conical gears about their respective axes a1, a2, each having a conical array of teeth about their respective axes a1, a 2. Also in this case, the rows of teeth of the peripheral ring gear 34 and of the intermediate drive wheel 40 (when present) will also be tapered rows.

In the example shown, peripheral ring gear 34 is an annular ring gear having a single internal row of teeth. The first drive gear 32.1 is a gear comprising a single outer row of teeth which co-operates by direct meshing engagement with a single inner row of teeth of the peripheral ring gear 34. In addition, in the example of fig. 4 to 6, the second drive gear 32.2 also has a single outer row of teeth which meshes directly with the single outer row of teeth of the first drive gear 32.1. In the example shown in fig. 7 to 9, the intermediate drive wheel 40 also comprises a single outer row of teeth which directly meshes with the single outer row of teeth of the first drive gear 32.1, and the second drive gear 32.2 comprises a single outer row of teeth which directly meshes with the single outer row of teeth of the intermediate drive wheel 40. The ring gear or the tooth row of the gear is single in that it is defined by a plurality of teeth having a single tooth profile. The individual tooth rows of the ring gear or of the gearwheel can, for example, have an annular groove around the axis of said ring gear or gearwheel, which groove divides each tooth of the individual tooth row continuously into two parts in the direction of extension of the tooth generating curve.

In the example shown, the rows of teeth of the three components are straight rows, the generatrices of the teeth of which are rectilinear and parallel to the respective axes of the three components, which are themselves parallel to each other. However, it may be provided that the rows are helical rows, or herringbone rows, etc., and the teeth are cylindrical rows or tapered rows.

In the example, the second drive gear 32.2 is carried by an upper portion of the second drive planet gear 28.2. It is therefore arranged above the planet gear carrier 26, in this case above the disk plate. Thus, the second driving gear 32.2 is received in the same protected space above the planet gear carrier 26 as said first driving gear 32.1 and the peripheral ring gear 34, and is therefore not visible from outside the food preparation household appliance 12.

According to the invention, the food preparation household appliance 12 is of the type: wherein for a given speed of the planet carrier 26 the first and second drive planet gears 28.1, 28.2 rotate about their respective working axes a1, a2, respectively, the absolute values of the rotational speeds being different from each other. Preferably, for a given speed of the planet carrier, the second drive planet gear 28.2 rotates about the second working axis a2 with an absolute value of the rotational speed greater than the absolute value of the rotational speed of the first drive planet gear 28.1 about the first working axis a 1. For example, the second drive gear 32.2 (and hence the second drive planet gear 28.2) rotates about the second working axis a2 with an absolute value of 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 a 1. This is particularly advantageous since it is then possible to drive the first work tool at a first work speed or to drive the second work tool at a second work speed which is different, in particular higher, for example between 1.1 and 2.0 times the first work speed, which is the same as the speed of the motor 30 and which is the same as the speed of the kinematic chain between the motor and the tool holder. It is further advantageous that it is known that the motor speed is normally limited at a minimum value on the one hand and at a maximum value on the other hand, so that the two different speeds of the two couplings make it possible to expand the ratio of the value range of the work tool in absolute value. Thus, the first coupling will be used for work tools requiring low speed and possibly high torque, while the second coupling will be used for work tools requiring high speed and possibly lower torque.

In general, the food preparation household appliance 12, the first work tool 14.1 and the second work tool 14.2 belong to a food preparation household appliance system 10, which food preparation household appliance system 10 comprises a food preparation household appliance 12, at least one first work tool configured to allow it to be coupled to a first coupling of the food preparation household appliance 12, and at least one second work tool configured to allow it to be coupled to a second coupling of the food preparation household appliance 12.

In the first embodiment, which is illustrated more particularly in fig. 4 to 6, the second drive gear 32.2 directly meshes with the first drive gear 32.1 without intermediate mechanical elements, in particular without intermediate gears. In this embodiment, the first and second drive gears 32.1, 32.2 rotate about their respective axes a1, a2 in opposite rotational directions.

In a second embodiment, more particularly shown in fig. 7 to 9, 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 a1 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 gears 28.2 to rotate themselves about the second working axis a2 via the intermediate transmission wheel 40. Preferably, the second drive gear 32.2 is indirectly mated with the first drive gear 32.1 via a single intermediate transfer gear 40, the single intermediate transfer gear 40 being a gear having an outer row of teeth which simultaneously mesh directly with both the first drive gear 32.1 and the second drive gear 32.1, as shown in figures 7 to 9. However, it can be provided that the food preparation household appliance 12 comprises a plurality of intermediate wheels arranged in cascade between the first driving gear and the second driving gear, said intermediate wheels being gears with outer rows of teeth, said intermediate wheels being mounted so as to rotate freely on the planet gear carrier. The number of intermediate wheels in cascade is for example odd, so that the first drive gear 32.1 and the second drive gear 32.2 rotate about their respective working axes a1, a2 in the same direction of rotation.

For embodiments comprising a single intermediate drive wheel 40, and for embodiments comprising a plurality of intermediate drive wheels, one or more of the intermediate drive wheels 40 are coplanar with each other and with the peripheral ring gear 34, the first drive gear 32.1 and the second drive gear 32.2. In the sense of the present application, this condition is satisfied if there is a plane perpendicular to the central axis AC, which plane intersects the rows of teeth of each peripheral ring gear 34, first drive gear 32.1, second drive gear 32.2 and intermediate transmission wheel 40.

As shown in the illustrated embodiment, the second drive gear 32.2 has a plurality of teeth, and thus a different diameter than the first drive gear 32.1, in this case a plurality of small teeth. In the embodiment in which the second drive gear 32.2 and the first drive gear 32.1 are directly meshed, or in which the second drive gear 32.2 is mated to 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 relative to the first drive gear 32.1.

In the example shown, the first and second working axes a1, a2 have the same eccentricity relative to the central axis AC. They may be said to be arranged with the same diameter or they may be arranged at equal distances from the central axis AC. This makes it possible for the first work tool and the second work tool to have a work tool geometry comparable to the geometry of the container. For this reason, it is important that the second driving gear 32.2 has a plurality of teeth and therefore a different diameter than the first driving gear 32.1, since any interference between the second driving gear 32.2 and the rows of teeth of the peripheral ring gear 34 is avoided even if the working axis is arranged with the same eccentricity with respect to the central axis AC.

It may be provided, however, that the first and second working axes a1, a2 have different eccentricities with respect to the central axis AC, e.g., the eccentricity of the second working axis a2 is smaller than the eccentricity of the first working axis a1 with respect to the AC axis. With this arrangement it is possible to obtain a second work tool 14.2 with a larger diameter for the same work container, thus benefiting from a larger tangential velocity of the work tool at the same rotational speed about the work axis a 2.

In certain embodiments, the first coupling 30.1 and the second coupling 30.2 may have the same work tool coupling geometry. In this case, it is envisaged that the same work tool may be mounted indifferently on the first coupling 30.1 and thus on the first drive planet gear 28.1, or on the second coupling 30.2 and thus on the second drive planet gear 28.2.

However, it can be provided with advantage that the first coupling 30.1 and the second coupling 30.2 have respectively a first and a second work tool coupling geometry which differ from each other.

Different geometries of the coupling between the work tool and the food preparation household appliance 12 are known in practice. The coupling geometry determines the coupling mechanism that functions to secure the work tool to the drive planetary gear under conditions that can allow the work tool to perform the food preparation job for which it is designed. Typically, the coupling geometry allows the work tool to be locked in all directions relative to the coupling. For example, it is known to define the coupling geometry of bayonet-type coupling mechanisms. It is also known to define a coupling geometry of a coupling mechanism comprising a rod formed as part of a work tool or part of a coupling, the rod being a faceted or notched rod or a rod having one or more radial projections and having a complementarily shaped bore hole on the other of the work tool and the coupling. Typically, the coupling geometry defines a coupling mechanism that allows the work tool to be manually coupled and decoupled on the coupling, thus eliminating the need for tools to accomplish the coupling.

By means of the different coupling geometries for the first coupling 30.1 and the first work tool 14.1 on the one hand, and the second coupling 30.2 and the second work tool 14.2 on the other hand, it is possible to adapt the coupling geometry to the respective work intended for the two work tools, in particular to the torque of the forces exerted on the work tools and thus on the couplings during the work.

In particular, it can be advantageously provided that the first coupling 30.1 is configured to inhibit coupling of the second work tool 14.2 and/or that the second coupling 30.2 is configured to inhibit coupling of the first work tool 14.1. Note that mounting of first work tool 14.1 on second coupling 30.2 may be prohibited, without having to prohibit mounting of second work tool 14.2 on first coupling 30.1, and vice versa.

Advantageously, the food preparation appliance system 10 may be configured to prevent simultaneous mounting of the first work tool 14.1 on the first coupling 30.1 and the second work tool 14.2 on the second coupling 30.2. For example, such a food preparation appliance system 10 may include a shield that would be mounted to be movable on the planet gear carrier between two positions, wherein in one position the shield would allow access to the first coupling and prevent access to the second coupling, and in another position would allow access to the second coupling and prevent access to the first coupling. Additionally or alternatively, such a food preparation appliance system 10 may include a shield that will connect to a work tool and will prevent access to another coupler when the work tool is coupled to the corresponding coupler.

Preferably, the first and second working axes a1, a2 are spaced from each other about 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, in which the second drive gear 32.2 directly meshes with the first drive gear 32.1 without intermediate mechanical elements, the first operating axis a1 and the second operating axis a2 are spaced from one another about the central axis AC by an angle strictly less than or equal to 45 degrees. In the second example shown, in which the second drive gear 32.2 is indirectly engaged with the first drive gear 32.1 via the intermediate transmission wheel 40, the first and second working axes a1, a2 are spaced from one another about the central axis by an angle in the range of 45 to 90 degrees.

For embodiments comprising a single or multiple intermediate transmission wheels 40, the intermediate transmission wheels 40 may be arranged such that their axes of rotation Ai also have the same eccentricity with respect to the central axis AC as the first and second working axes a1, a2, as in the embodiments of fig. 7 to 9. However, the axis of rotation Ai may have an eccentricity different from one or the other of these axes, even different from one and the other of these axes. For example, it can be provided that the intermediate transmission wheel 40 is arranged such that its axis of rotation Ai has an eccentricity with respect to the central axis AC that is smaller than the first working axis a1 and optionally also smaller than the second working axis a 2. By the arrangement of the intermediate transmission wheel 40 radially inwardly with respect to the first drive gear 32.1 and with respect to the second drive gear 32.2, the first drive gear 32.1 and the second drive gear 32.2 can be brought closer angularly for the same wheel diameter, the angular spacing between the first working axis a1 and the second working axis a2 about the central axis AC being reduced, which angular spacing can then be less than 45 degrees.

By combining two couplings together in the same angular sector of the planet gear carrier 26, for example an angular separation between the first working axis a1 and the second working axis a2 around the central axis AC of less than 90 degrees, even less than 45 degrees, they can be arranged in the same reinforced sector of the planet gear carrier 26.

The invention makes it possible to produce a food preparation household appliance comprising two output couplings, which may in particular have different rotational speeds, by simply changing the planet carrier 26, without requiring other modifications to the existing devices comprising a single output coupling on its planet carrier. In fact, in both cases, the planet carrier comprises a single driving gear directly meshing with the peripheral ring gear.