Food preparation device for a food preparation appliance

Abstract

A food preparation device for a food preparation appliance, comprising: - a rotating internal shaft (10), - a working tool (20) mounted in a helical connection on the rotating internal shaft (10), characterized in that: - the food preparation device comprises a drive device (30) with a first rotating hub (31) and a second rotating hub (32), - the rotating internal shaft (10) can couple with the first rotating hub (31), - the food preparation device comprises a rotating hollow shaft (40): mounted in a pivot or sliding pivot connection on the rotating internal shaft (10), comprising a beveled contact surface (41), and comprising the second rotating hub (32), in which the working tool (20) comprises a counterform (25) arranged to enter into contact with the beveled contact surface (41). Figure for the abstract: Fig. 1

Description

Title of the invention: Food preparation device for a food preparation appliance Technical field of the invention

[0001] The present invention relates generally to food preparation appliances, and in particular to household appliances equipped with or comprising at least one rotating working tool, such as a meat grinder, a knife, a whisk, a mixer, etc., designed to process food, for example, placed in a working bowl. Prior art

[0002] It is known in the prior art of apparatus to provide a vertical movement of the working tool within the working bowl to ensure homogeneous processing of all the food contained within the bowl. Document EP2445636B1 discloses such an apparatus. However, the disclosed mechanism is complex, with numerous components that are difficult to manufacture and assemble. Description of the invention

[0003] One object of the present invention is to address the disadvantages of the prior art mentioned above and in particular, first of all, to propose a food preparation device for a food preparation appliance which allows food contained in a working tank to be worked over the entire height of the food and / or in a more homogeneous manner, without adding complexity or requiring parts that are difficult to manufacture.

[0004] To this end, a first aspect of the invention relates to a food preparation device for a food preparation appliance, the food preparation device comprising:

[0005] - an internal rotating shaft,

[0006] - a working tool mounted in a helical connection on the rotating internal shaft,

[0007] characterized in that:

[0008] - the food preparation device includes a drive device with a a first rotating hub and a second rotating hub respectively arranged to be driven in rotation according to a first rotational speed and according to a second rotational speed,

[0009] - the internal rotating shaft includes a first coupling arranged for to couple with the first rotating hub to be driven in rotation according to the first rotational speed, - The food preparation device includes a rotating hollow shaft: • mounted with a pivot or sliding pivot joint on the rotating internal shaft, • comprising a beveled contact surface, and • comprising the second rotating hub, or a second coupling arranged to be coupled with the second rotating hub, to be driven in rotation according to the second rotational speed, in which the working tool includes a counter-form,

[0010] and in which the beveled contact surface is arranged to come into contact with the counterform of the working tool to force an axial movement of the working tool on the rotating internal shaft.

[0011] According to the above embodiment, the device comprises, on the one hand, a drive device with two rotating hubs, and on the other hand, a tool holder assembly (the rotating inner shaft, the working tool, and the rotating hollow shaft). The tool holder is thus composed of only three parts, forming a simple assembly to manufacture and construct, yet the working tool can move axially. In particular, it should be noted that the helical linkage is designed to move the working tool upwards along the rotating inner shaft, while the rotating hollow shaft, with its beveled contact face, is designed to force a downward axial movement. Specifically, when the working tool rotates at the first speed and processes the food to be prepared, it experiences a reaction force from the food, which causes the upward axial movement due to the helical linkage.The rotating hollow shaft, with its beveled contact face and rotating at a second speed, is therefore in relative motion with the working tool, which causes a relative displacement between the counterform of the working tool and the beveled contact surface of the rotating hollow shaft and forces a downward movement of the working tool.

[0012] According to one embodiment, the first rotating hub is mounted via a pivot joint on the second rotating hub. In this embodiment, the first rotating hub is pivotally mounted on the second rotating hub, and it can typically be provided that the second rotating hub forms or comprises a ring or bearing through which the first rotating hub and / or the internal rotating shaft passes.

[0013] According to one embodiment, the helical connection of the working tool to the rotating internal shaft has a helix angle between 30° and 60°. Such a helix angle allows the working tool to move axially under the effect of the reaction force exerted by the food being processed on the working tool.

[0014] According to one embodiment, the beveled contact surface and / or the counterform comprises or has: - at least one tangent or tangent direction inclined with respect to an axial direction of the rotating internal shaft, and / or - at least one normal or normal direction exhibiting a first A component parallel to an axial direction of the rotating internal shaft and a second component normal or perpendicular to an axial direction of the rotating internal shaft. The beveled contact surface and / or the counterform are well suited to transmit an axial force that will cause axial displacement of the working tool.

[0015] According to one embodiment, the first coupling is formed at a first end of the rotating internal shaft, and the rotating internal shaft includes a centering portion arranged at a second end of the rotating internal shaft. The food preparation device includes a centering bearing arranged to receive the centering portion. The centering bearing may be provided at the bottom of a work vessel to properly guide the rotating internal shaft at both ends.

[0016] According to one embodiment, the food preparation device may include a work tank or a food preparation bowl with a side wall and a bottom.

[0017] According to one embodiment, the centering bearing is formed in the bottom of the working tank.

[0018] According to one embodiment, the food preparation device comprises a removable cup forming a removable lid for the working bowl, wherein the removable cup includes the first rotating hub and the second rotating hub. The removable cup incorporates the first rotating hub and the second rotating hub so as to form a subassembly that is easy for the user to handle.

[0019] According to one embodiment, the drive device includes a reducer arranged between the first rotating hub and the second rotating hub.

[0020] According to one embodiment, the reducer comprises at least one double pinion with a first toothed portion engaged with the first rotating hub and a second toothed portion engaged with the second rotating hub. Such a double pinion makes it easy to multiply or reduce the rotational speed of the second rotating hub from the first rotating hub.

[0021] According to one embodiment, the reducer comprises three double pinions, each with a first toothed portion engaged with the first rotating hub and a second toothed portion engaged with the second rotating hub.

[0022] According to one embodiment, the first toothed portion comprises a first number of teeth and the second toothed portion comprises a second number of teeth different from the first number of teeth, so as to have a reduction ratio different from 1 and between 1.2 and 0.8, and preferably between 1.01 and 1.2 so that the second rotation speed is greater than the first rotation speed.

[0023] According to one embodiment, the drive device comprises a shaft The input shaft is engaged with the first rotating hub and the second rotating hub, and arranged to be coupled and driven by a drive motor. The input shaft can form a drive nut to couple with the drive motor quickly and securely.

[0024] According to one embodiment, the input shaft is formed on the first rotating hub.

[0025] According to one embodiment, the drive device includes at least one drive motor engaged with the first rotating hub and the second rotating hub, and the drive device preferably includes a single drive motor engaged with the first rotating hub and the second rotating hub.

[0026] According to one embodiment, the removable cup includes the drive device.

[0027] According to one embodiment, the removable cup is part of a housing containing said at least one drive motor.

[0028] According to one embodiment, the drive motor may be provided to be removable from the rest of the drive device, typically the drive motor may be provided to be removable or detachable from the removable cup to allow for possible cleaning.

[0029] According to one embodiment: - the rotating hollow shaft comprises a first end with a beveled contact surface and a second end with a second coupling arranged to couple with the second rotating hub, Or - the rotating hollow shaft comprises a first end with the beveled contact surface and a second end with the second rotating hub and preferably the rotating hollow shaft is formed as a single piece with the second rotating hub.

[0030] According to one embodiment, the bottom of the working tank is removable and includes a sealing gasket. Cleaning is facilitated.

[0031] According to one embodiment, the assembly of the first rotating hub and the first coupling forms a splined coupling.

[0032] According to one embodiment, the assembly of the second rotating hub and the second coupling forms an asymmetrical toothed coupling, each tooth having a stop face parallel to an axial direction of the rotating inner shaft and a sliding face inclined relative to the axial direction of the rotating inner shaft. The inclined sliding face compensates for angular misalignment, and the stop face transmits the drive force to the rotating hollow shaft.

[0033] According to one embodiment, the beveled contact surface and the counterform are essentially flat faces, inclined with respect to the axial direction of the shaft internal rotating. However, complex and non-planar surfaces can be accommodated.

[0034] According to one embodiment, the beveled contact surface and the counterform are helical faces, inclined with respect to the axial direction of the rotating internal shaft by a predetermined helix angle.

[0035] According to one embodiment, the removable cup includes a movable safety device, arranged to engage with the work tank and with a drive motor control unit only if it is engaged with the work tank.

[0036] According to one embodiment, the first rotation speed is different from the second rotation speed, and preferably the first rotation speed is in the same direction as the second rotation speed. Description of the figures

[0037] Other features and advantages of the present invention will become more apparent upon reading the following detailed description of an embodiment of the invention given by way of non-limiting example and illustrated by the accompanying drawings, in which:

[0038] [Fig-1] represents a general view of a food preparation device according to the present invention, generally comprising a working tank, a drive device and a motor housing;

[0039] [Fig.2] represents the subassembly working tank - drive device of the [Fig.l], with a side wall of the working tank removed or made transparent to show a tool holder assembly arranged in the working tank;

[0040] [Fig.3] represents a rotating internal shaft, a working tool, a hollow shaft rotating of the tool holder assembly of [Fig.2] and a first rotating hub of the drive device of [Fig.1];

[0041] [Fig.4] represents the internal rotating shaft of the [Fig.3] mounted on the bottom of the tank work;

[0042] [Fig.5] represents the working tool of [Fig.3];

[0043] [Fig.6] represents two perspective views of the first rotating hub of the [Fig.3];

[0044] [Fig.7] represents the rotating hollow shaft of [Fig.3];

[0045] [Fig.8] represents two perspective views of the drive device of the [Fig.1] or 2;

[0046] [Fig.9] represents two perspective views of an internal part of the device training of the [Fig.1] or 2;

[0047] [Fig. 10] represents an exploded view of the tool holder assembly of [Fig.2] or 3, with part of the drive device of [Fig.1] or 2;

[0048] [Fig. 11] represents a schematic view of the food preparation apparatus of the [Fig.l], ready to operate;

[0049] [Fig. 12] represents a schematic view of the food preparation apparatus of [Fig.1 1], after an upward axial movement of the working tool;

[0050] [Fig. 13] represents a schematic view of the food preparation apparatus of [Fig. 12], after a downward axial movement of the working tool;

[0051] [Fig. 14] represents a schematic view of an alternative embodiment of the drive device and the rotating hollow shaft of the food preparation appliance of [Fig.1];

[0052] [Fig. 15] represents another schematic view of the alternative embodiment of the drive device and the rotating hollow shaft of the food preparation apparatus of [Fig. 14].

[0053] Detailed description of embodiment(s)

[0054] Fig. 1 represents a general view of a food preparation apparatus according to the present invention, generally comprising a working bowl 50, a motor housing 60 housing a drive motor and a drive device 30 arranged between the working bowl 50 and the motor housing 60.

[0055] As shown in [Fig.2], the working tank 50: - includes a side wall 52 (removed or transparent, shown in dotted lines) and a base 51, - contains a rotating internal shaft 10 which supports a working tool 20 and a rotating hollow shaft 40, - supports in the upper part the drive device 30 which can receive the motor housing 60 of the [Fig.l] and transmit to the working tool 20 a rotational drive movement from the motor housed in the motor housing 60.

[0056] It can be noted that the drive device 30 is interposed between the work tank 50 and the motor housing 60 to drive the work tool 20. In [Fig. 1], the drive device 30 closes the work tank 50 and is detached from the motor housing 60. A reversible coupling between the drive device 30 and the motor housing 60 can be provided, but it is preferable to permanently integrate the drive device 30 onto the motor housing 60, or to provide a removable coupling between the drive device 30 and the motor housing 60 for cleaning, for example.

[0057] In any event, the drive device 30 (or the motor housing 60 in the case where the drive device 30 is included or permanently integrated on the motor housing 60) is intended to couple reversibly with the work bowl 50 to open and close it in order to place or remove food and / or the work tool 20.

[0058] In [Fig.2], it can be noted that the drive device 30 comprises a first rotating hub 31, a removable cup 35 serving as a casing or chassis for the drive device 30, a sealing plate 33 and slats 34 which are part of a safety device preventing the motor of the motor housing 60 from starting if the work bowl 50 is not correctly coupled to the removable cup 35.

[0059] Fig. 3 represents the internal rotating shaft 10 which supports the working tool 20, and a hollow rotating shaft 40 on which a second rotating hub 32 is directly formed which receives the first rotating hub 31.

[0060] In other words, and as will be explained below, a pivot joint is provided between the first rotating hub 31 and the second rotating hub 32 (the rotating hollow shaft 40 in this embodiment): these two parts can rotate freely relative to each other.

[0061] It is intended that the working tool 20 can be moved axially along the rotating internal shaft 10, in a reciprocating motion. For this purpose, a helical joint is provided between the rotating tool 20 and the rotating internal shaft 10.

[0062] Figure 4 shows the rotating internal shaft 10 mounted by pivot joint on the base 51, with a double thread 12 provided up to approximately half the height of the rotating internal shaft 10. The upper part of the rotating internal shaft 10 remains smooth and the upper end of the rotating internal shaft 10 forms a splined end 13 which forms a first coupling for engaging with or in the first rotating hub 31. The lower part of the rotating internal shaft 10 includes a centering portion which is thus arranged at a second end of the rotating internal shaft 10,

[0063] The bottom 51 is assembled in a sealed manner with the side wall 52 of the working tank 50. A centering bearing 53, more clearly visible in figures 11 to 15, is formed in the bottom 51 of the working tank 50. The centering bearing 53 is arranged to receive the centering portion.

[0064] Figure 5 shows the working tool 20, which comprises a main body 24 on which two blades 23 are mounted, and which extends into a beveled barrel comprising a through central bore 21, with helical grooves 22 and a beveled lateral surface forming a counterform 25 (with two visible beveled faces [Fig. 5] on either side of the bore 21). It can be noted that the rotating internal shaft 10 is designed to pass through the central bore 21, and that the double thread 12 can engage with the helical grooves 22.

[0065] During the rotation of the working tool 20 imposed by the rotating internal shaft 10, the processed food exerts in return a force or a reaction torque on the working tool 20, and the helical linkage makes it possible to transform this force or reaction torque into an axial force to cause an axial displacement upwards of the working tool 20.

[0066] In the example shown, the working tool 20 carries two blades 23 for cutting food, but all sorts of variations are possible, to make a mincer, a mixer, a blender, a kneader...

[0067] Figure 6 shows two perspective views of the first rotating hub 31, which includes a splined head 311, a first toothed portion 312, and a lower shaft portion 313. It can be noted that in the right-hand view, the lower shaft portion 313 includes a grooved bore 314, which is designed to receive the splined end 13 of the internal rotating shaft 10. The first rotating hub 31 is designed to drive the internal rotating shaft 10 in rotation.

[0068] Figure 7 shows a perspective view of the rotating hollow shaft 40. As seen above, in this embodiment, the second rotating hub 32 is directly integrated into the rotating hollow shaft 40. However, two separate parts may be provided. In the example of Figure 7, the rotating hollow shaft 40 includes a central bore 323 which can receive: - from above the lower shaft portion 313 in pivot joint, and - from below the internal rotating shaft 10.

[0069] A toothed portion 321 is provided in the upper part and a cylindrical shaft 322 is provided to engage in a bearing of the removable cup 35 (a sliding ring, ball bearings, etc., may be provided). Thus, the second rotating hub 32 is in a pivot joint with respect to the removable cup 35, and can receive the first rotating hub 31 in a pivot joint.

[0070] The rotating hollow shaft 40 also includes in its lower part a beveled contact surface 41, arranged to cooperate with the beveled lateral surface forming a counter-form 25 of the working tool 20.

[0071] Indeed, as explained below, the training device 30 is designed to train: - the internal rotating shaft, and therefore the working tool 20, at a first rotational speed, via the first rotating hub 31, and - the hollow rotating shaft 40 at a second rotational speed, via the second rotating hub 32, so that the rotating hollow shaft 40 and the working tool 20 have a differential in angular velocity, and a constant angular phase shift occurs between these two parts during the processing of the food.

[0072] As seen above, the working tool 20 is naturally pushed upwards by the reaction torque of the processed food and the helical connection, so that the counterform 25 of the working tool 20 eventually comes into contact with the beveled contact surface 41 due to the angular velocity differential between the rotating hollow shaft 40 and the working tool 20. During a relative rotation between the hollow shaft With the working tool 20 rotating 360°, the beveled contact surface 41 slides on the counterform 25 alternately: - push the working tool 20 downwards, then - allow the working tool 20 to rise upwards. The axial movement of the working tool 20 is therefore an alternation of upward and downward movements in the working tank 50.

[0073] In detail, the drive device 30 shown in figures 8 and 9 includes the removable cup 35 which supports in this embodiment: on the one hand in the upper part (left view of [Fig.8]): - the first rotating hub 31 in the upper part, - the sealing plate 33, - the slats 34 of the safety device, on the other hand in the lower part (right view of [Fig.8]): - the rotating hollow shaft 40.

[0074] It can be noted that the slats 34 are visible on the right view, and open into a groove which must receive the side wall 52 of the work tank 50: a displacement is imposed on the slats 34 if the side wall 52 is correctly in place, which makes it possible to detect a correct assembly to allow the motor to operate safely.

[0075] Figure 9 shows the inside of the cup 35: three double gears 36 are engaged between the first rotating hub 31 and the second rotating hub 32. The double gears 36 are identical, with a first toothed portion engaged with the first rotating hub 31 and a second toothed portion engaged with the second rotating hub 32. To impose the speed differential between the rotating hollow shaft 40 and the working tool 20, the first toothed portion has a different number of teeth than the second toothed portion. A reduction ratio of between 0.8 and 1.2 can be used. For example, one tooth difference for every 20 teeth can be used.

[0076] In summary, the first rotating hub 31 is driven by the motor of the food preparation appliance at a first rotational speed, and transmits this movement: - to the internal rotating shaft 10 directly and without reduction ratio, - to the double gears 36. The double gears 36 in turn drive the rotating hollow shaft 40 in rotation, but due to the difference in the number of teeth between the first toothed portion and the second toothed portion, the rotating hollow shaft 40 has a second speed of rotation, different from the first speed of rotation.

[0077] Figure 10 schematically shows an exploded view of the assembly described above: - the internal rotating shaft 10 supports the working tool 20 in its lower part, - the first rotating hub 31 is mounted in the second rotating hub 32, - the three double pinions 36 are engaged between the first rotating hub 31 and the second rotating hub 32, - the splined end 13 of the internal rotating shaft 10 is engaged in the grooved bore 314 of the lower shaft portion 313 of the first rotating hub 31.

[0078] Figure 11 is a schematic representation of the food preparation apparatus in its working configuration, with food to be prepared 200 placed in the working bowl 50, along with the working tool 20, the internal rotating shaft 10, and the hollow shaft 40. The drive device 30 with the removable cup 35 covers the working bowl 50, and the motor M is coupled to the first rotating hub 31. The working tool 20 is located at the bottom of the working bowl 50. It can be noted that the second rotating hub (here, the rotating hollow shaft 40) is mounted on a ball bearing (black squares) fitted into the removable cup 35.

[0079] Figure 12 shows the food preparation apparatus of Figure 11 after a certain period of operation. The motor M drove the rotating internal shaft at the first rotational speed via the first rotating hub 31. The reaction torque exerted by the food to be prepared 200 on the working tool 20 is transformed into an upward axial force by the thread of the rotating internal shaft 10, so that the working tool 20 moved upwards until it came into contact with the beveled contact surface of the rotating hollow shaft 40.

[0080] During the following rotations, the rotating hollow shaft 40 being driven at the second rotation speed by means of the double pinions 36, it will move angularly relative to the working tool 20 and push it progressively downwards as shown in [Fig. 13] where it can be noted, compared to [Fig. 12], that the rotating hollow shaft 40 has moved 180° relative to the working tool 20 which is now again at the bottom of the working bowl 50.

[0081] Fig. 14 shows an alternative embodiment, in which the rotating hollow shaft 40 and the second rotating hub 32 are two separate parts.

[0082] In detail, the second rotating hub 32 always carries the first rotating hub 31 in a pivot joint and is mounted on the removable cup 35 by ball bearings (black squares). However, the rotating hollow shaft 40 is in a sliding pivot joint on the internal rotating shaft 10, and rests on the working tool 20. A second coupling can be provided between the rotating hollow shaft 40 and the second rotating hub 32, formed, for example, by lower teeth 62 formed on the lateral wall of the rotating hollow shaft 40, oriented upwards, and by upper teeth 61 formed on the lateral wall of the second rotating hub 32, oriented downwards. In detail, the upper teeth 61 of the second rotating hub 32 are opposite the lower teeth 62 of the rotating hollow shaft 40 in [Fig. 14], and clearly visible [Fig. 15].

[0083] As shown in [Fig. 15], when the removable cup 35 is removed, the rotating hollow shaft 40 remains on the rotating internal shaft 10, in the working bowl 50. During operation, only the first working phase is different. Indeed, during the initial raising of the working tool 20, the rotating hollow shaft 40 is disengaged from the second rotating hub 32 and rotates at the same speed as the working tool 20.

[0084] When the working tool 20 reaches its top dead center, it forces the rotating hollow shaft 40 to engage with the second rotating hub 32 thanks to the asymmetrical shape of the lower teeth 62 and the upper teeth 61 of the second coupling. The second rotating hub 32 is then driven at the second rotational speed, and thus imposes the angular phase shift between the working tool 20 and the rotating hollow shaft 40.

[0085] We then find the operation of the first embodiment: the rotating hollow shaft 40 being driven at the second rotation speed by means of the double gears 36, it will move angularly relative to the working tool 20 and push it progressively downwards via the beveled contact surface 41 and the counterform 25. Industrial application

[0086] A food preparation device according to the present invention, and its manufacture, are capable of industrial application.

[0087] It will be understood that various modifications and / or improvements obvious to a person skilled in the art can be made to the different embodiments of the invention described in this description without departing from the scope of the invention.

[0088] In particular, it can be noted that other manufacturing configurations are possible at the level of the first rotating hub and the second rotating hub: the first rotating hub can be mounted on a bearing of the removable cup, the motor shaft can be mounted on a bearing of the removable cup... The removable cup can be directly integrated into the motor housing.

[0089] Other types of gearboxes can also be used, with more or fewer gears to control the first and second rotational speeds. Differentials with planetary gears can be used, and two separate motors can be used...

Claims

Demands

1. Food preparation device for a food preparation appliance, the food preparation device comprising: - a rotating internal shaft (10), - a working tool (20) mounted in a helical connection on the rotating internal shaft (10), characterized in that: - the food preparation device comprises a drive device (30) with a first rotating hub (31) and a second rotating hub (32) respectively arranged to be driven in rotation at a first rotational speed and at a second rotational speed, - the rotating internal shaft (10) comprises a first coupling arranged to couple with the first rotating hub (31) to be driven in rotation at the first rotational speed, - the food preparation device comprises a rotating hollow shaft (40): • mounted in a pivot or sliding pivot connection on the rotating internal shaft (10),• comprising a beveled contact surface (41), and • comprising the second rotating hub (32), or a second coupling arranged to be coupled with the second rotating hub (32), to be driven in rotation according to the second rotational speed, in which the working tool (20) comprises a counterform (25), and in which the beveled contact surface (41) is arranged to come into contact with the counterform (25) of the working tool (20) to force an axial movement of the working tool (20) on the internal rotating shaft (10).

2. Food preparation device according to claim 1, wherein the first rotating hub (31) is mounted in pivot connection on the second rotating hub (32).

3. A food preparation device according to any one of claims 1 to 2, wherein the helical connection of the working tool (20) to the rotating internal shaft (10) has a helix angle between 30° and 60°.

4. Food preparation device according to any one of claims 1 to 3, - wherein the first coupling is formed at a first end of the rotating internal shaft (10), wherein the rotating internal shaft (10) includes a centering portion arranged at a second end of the rotating internal shaft (10), the food preparation device comprising a centering bearing (53) arranged to receive the centering portion.

5. Food preparation device according to any one of claims 1 to 4, comprising a working tank (50) with a side wall (52) and a bottom (51).

6. Food preparation device according to claim 5 in its dependence on claim 4, wherein the centering bearing (53) is formed in the bottom (51) of the working tank (50).

7. A food preparation device according to any one of claims 5 to 6, comprising a removable cup (35) forming a removable lid for the working bowl (50), in which the removable cup (35) includes the first rotating hub (31) and the second rotating hub (32).

8. Food preparation device according to any one of claims 1 to 7, wherein the drive device (30) comprises a reducer arranged between the first rotating hub (31) and the second rotating hub (32).

9. Food preparation device according to claim 8, wherein the reducer comprises at least one double pinion (36) with a first toothed portion engaged with the first rotating hub (31) and a second toothed portion engaged with the second rotating hub (32).

10. Food preparation device according to claim 9, wherein the reducer comprises three double gears (36) each with a first toothed portion engaged with the first rotating hub (31) and a second toothed portion engaged with the second rotating hub (32).

11. A food preparation device according to any one of claims 9 to 10, wherein the first toothed portion comprises a first number of teeth and the second toothed portion comprises a second number of teeth different from the first number of teeth, so as to have a reduction ratio different from 1 and between 1.2 and 0.8, and of

12.

13.

14.

15.

16. Preference between 1.01 and 1.2 so that the second rotation speed is greater than the first rotation speed. A food preparation device according to any one of claims 8 to 11, wherein the drive device (30) comprises an input shaft engaged with the first rotating hub (31) and the second rotating hub (32) and arranged to be coupled and driven by a drive motor. Food preparation device according to claim 12, wherein the input shaft is formed on the first rotating hub (31). A food preparation device according to any one of claims 1 to 11, wherein the drive device (30) comprises at least one drive motor engaged with the first rotating hub (31) and the second rotating hub (32), and wherein the drive device (30) preferably comprises a single drive motor engaged with the first rotating hub (31) and the second rotating hub (32). Food preparation device according to any one of claims 8 to 14 in their dependence on claim 7, wherein the removable cup (35) includes the drive device (30). Food preparation device according to claim 15 in its dependence on claim 14, wherein the removable cup (35) is part of a housing containing said at least one drive motor.

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