EP3183500B1 - Operating device for a domestic appliance having a stably positioned annular operating-element front part - Google Patents

Description

The invention relates to an operating device for a household appliance, with an electronic display panel, and an operating element which is movable relative to the display panel for setting operating conditions of the household appliance. Furthermore, the invention relates to a household appliance with a corresponding operating device.

Operating devices for household appliances, for example ovens, washing machines, tumble dryers, dishwashers or the like, are known in a wide variety of configurations. For this purpose, touch-sensitive operating devices with touch areas are also known, such as operating elements in the form of rotary switches, push switches, and thus operating elements that have to be moved relative to a display unit in order to set operating conditions.

Especially in the case of such operating devices with movable operating elements, in combination with electronic display fields as display units, a compact structure with user-friendly usability and intuitively perceptible information presentation is difficult or not possible. The components mentioned must be arranged separately and at a distance from one another. Furthermore, such controls are known to be very large and bulky, so that on the one hand they require a lot of space. This in view of the general size as a gag and thus cylinder, as well as in terms of extending out of the operating device to the front in order to be able to grip and turn it.

A generic control device is from the WO 2012/080156 A1 known.

From the DE 102 55 676 A1 a control knob is known which has a bell-shaped configuration. A rotatable part is connected via springs and locking balls to a holding element, locking recesses for locking the balls being formed on a jacket region of a central part of the rotatable element of the control knob. In addition, from the EP 1 258 878 A2 an operating device is known in which an annular front part can be placed on a further ring and there is a coupling in the axial direction by immersing spherical elements in a recess formed on an underside of the partial element of the outer ring.

It is an object of the present invention to provide an operating device for a household appliance and a household device with a corresponding operating device, in which or in which a front part of an operating element is positioned more stably and yet can be rotated easily.

This object is achieved by an operating device and a household appliance according to the independent claims.

An operating device according to the invention for a household appliance comprises an electronic display panel and an operating element which can be moved relative to the display panel in order to set operating conditions of the household appliance. The control element is constructed in several parts and has a slide ring and an annular front part resting thereon. An essential idea of the invention is to be seen in the fact that the front part and the slide ring are coupled to a guide and that the front part can be rotated relative to the slide ring by the guide. With this configuration, the front part can be secured against falling out and still be rotated smoothly.

The guide has a groove open in the radial direction of the front part and comprises at least one engagement element for engagement in the groove. This is a simple coupling for securing the front part and is nevertheless permanently functional and enables the front part to be turned smoothly.

When viewed in the radial direction of the slide ring and in the radial direction of the front part, the engagement element is designed to be resilient. This is particularly advantageous in that the coupling and decoupling are made possible without destruction and the relative movement of the front part relative to the slide ring is also smooth and compensatingly allowed without excessive friction occurring during turning and thus the turning movement would be bulky.

In the coupled state with the groove, the engagement element is arranged biased in the groove, in particular arranged radially biased therein. The play-free guidance is particularly favored and enables a very precise and precise rotary movement.

In particular, the groove on the front part is formed on a radially inner jacket side of the front part. The coupling and movement control is improved and due to the gravity with a vertically oriented front part, the front part also sits on the Engagement element on, so that this results in a load-bearing or lifting storage of the front part.

Preferably, the slide ring has a slide plate, which, viewed in the axial direction of the operating element, is arranged behind the front part, the slide ring having a holding web which extends in the axial direction overlapping with the front part, at least one radially extending engagement element being formed on the holding web which extends in the radial direction into the groove. As a result, the coupling on the one hand and the smooth-running radial and axial wobble-free relative movement of the front part to the slide ring are particularly achieved.

The slide ring is preferably arranged stationary on the control panel. In particular, the slide ring is glued or welded to the control panel or hot-caulked. This favors the relative movability of the front part with respect to the slide ring and achieves the very precise and play-free guidance of the front part and provides a mechanically stable and permanent position-secure arrangement.

The control element has a front part, which preferably has an inwardly inclined upper side. This front part is movable relative to the display panel. This configuration with regard to the shape of the front part on the one hand and the arrangement on the other hand ensures a very compact operating device, especially with regard to the components of the electronic display panel and the operating element.

The ring shape of the front part and in particular the inwardly inclined upper side ensures that it can be touched and actuated by a finger of a user with particular ease of movement and target safety. The rotation of the annular front part can be carried out very precisely by a user.

It can also be provided, but not part of the present invention, that the front part has a full circular surface which is inclined inwards and thus quasi represents a full funnel.

An electronic display panel is understood to mean, in particular, a display on which information can be displayed in a dynamically changing manner. This can be information comprising letters and / or numbers and / or symbols.

The control element is basically designed as a ring. A shape as a full cylinder or the like is therefore no longer provided. On the one hand, material can be saved in this way, and with regard to the basic operating principle, this can be designed in such a way that the cylinder of the control knob to be gripped on its casing side in comparison to the prior art is no longer present here, but rather the front or top of it annular front part is touched by a user and then this front part is rotated. In principle, therefore, another surface is provided for the user to touch and the associated movement of the control element. In this regard, the ring shape results in a very suitable shape in that an operating element is provided which has a relatively large diameter. This can be larger than conventional cylindrical control knobs. Precisely due to the annular configuration of the front part and the intended contact on the upper side, the control element according to the invention can then be brought very precisely into a desired rotational position for setting desired operating conditions. This is not possible with conventional cylindrical control elements. Because on the one hand, the ability to turn it when touched is only difficult at the front of this hollow cylinder and is mechanically connected with greater force and, moreover, does not cause smoothness and requires incorrect settings. In this regard, the conventional cylindrical control knobs are designed so that their diameter is made smaller, so that the front of such cylindrical control knobs is also relatively small and, due to the force paths, is then very difficult or impossible to turn with regard to contact with a finger can.

The control element is preferably designed as a rotary selector. This means that the operating conditions then assigned and desired can be selected and / or set by setting different rotary positions.

Setting operating conditions generally includes both the selection of functional subunits of a household appliance and the setting of values of operating parameters of these functional subunits. For example, the operation of the cooking space or a cooking zone can be provided for an oven as a functional subunit. In addition, an operating parameter, for example the temperature, the cooking zone or the cooking space can be set accordingly.

The ring-shaped front part is in particular touching the slide ring. The slide ring is made of a specific material that promotes the mobility of the ring-shaped front part with as little friction as possible. This enables a particularly smooth and user-friendly rotation of the front part. With regard to the material design of the slide ring, conventional and known polymer materials can be provided which have particularly low friction.

It is preferably provided that the control element designed as a ring has magnets, an associated operating setting of the household appliance being able to be detected in interaction of the magnets with fixed metal elements, in particular an annular metal spider, depending on a relative movement of the ring, in particular the annular front part, to the metal elements. The magnets can preferably be attached to the back of the front part or embedded therein. The rotational position of this front part relative to the metal elements, in particular the annular metal spider, can thus be detected on the basis of this interaction and evaluated by a control unit of the operating device.

It is particularly advantageously provided that the metal elements are arranged on the back of a cover that at least partially covers the front of the display panel.

With regard to the metal spider, which is preferably formed in one piece, the diameter is preferably substantially the same as the diameter of the slide ring and / or the annular front part.

The metal spider preferably has a thickness of less than 1 mm, preferably 0.7 mm. It is preferably embedded or arranged in a recess on the back of the cover. The flat design of the control device is favored. On the other hand, the metal spider is held securely and mechanically stable.

It is preferably provided that the control element designed as a ring is designed to be permeable to light in the spectral range visible to humans at least in some areas. With such a configuration, additional optical information can be passed on to a user. In addition to the identification of the control element for a user with regard to the general position of the control element in the control device, an operating condition can also be optically indicated. It can be provided that the annular front part can be completely backlit, or that only ring sections can be backlit accordingly.

It is preferably provided that the control element is embedded in a plate-shaped cover arranged in front of the display panel and in particular permeable to the light of the display panel. This cover is therefore multifunctional, since on the one hand it acts as a carrier for the control element and this control element takes up space-minimized space. On the other hand, it serves as protection for the display panel, so that it is protected against wear or damage. Due to the translucent design, a particularly space-minimized arrangement can also be provided with regard to the surface dimensions.

It is preferably provided that the annular front part, in particular at least its outer edge, projects above the top of the cover, in particular less than 1.5 mm, in particular less than 1 mm. This is a particularly advantageous embodiment. Because especially in connection with the funnel-shaped upper side of the annular front part or the obliquely inwardly inclined upper side and this slight protrusion of the outer edge, on the one hand a particularly secure gripping and touching of the operating element can be guaranteed. On the other hand, it can be avoided that the finger is not inadvertently brushed along the outside of the cover with the finger. On the one hand, undesirable contamination of this outside and an undesired slipping off of the finger from the top of the annular front part of the operating element can be avoided. The movement control is particularly favored and user-friendly by this configuration of the control element.

Last but not least, it should be mentioned in this connection that this embedding of the front part and this minimal projection of only the outer edge of this annular front part is particularly minimized with regard to the structure of the operating device or its installation space depth.

The control element, which is designed as a ring, is preferably arranged in a groove which is open to the front in the axial direction in the front of the cover. This means that in particular the annular front part and the sliding ring are arranged in this front groove. This also allows their positioning to be mechanically favored and to be performed particularly well with regard to the relative rotary movement.

It is preferably provided that a groove is formed on the outside or front of this cover, in which the slide ring and the annular front part are arranged sunk. A groove in which the metal spider is positioned is preferably congruent on the back of this cover. In particular, it can be provided in a first embodiment that there is still material of the cover between the two grooves and thus also between the metal spider and the sliding ring.

In an alternative embodiment it can be provided that the cover has a completely continuous recess. The named components of the operating element can then be introduced into this hole recess and a rear cover, for example a sheet metal or a plastic part, can be provided, which then closes the construction from the rear. It can also be provided that a further corresponding glass part is then introduced and fastened into this hole, the components of the operating element mentioned then being arranged therein.

In addition to the multi-part design of the control element already mentioned, however, a one-piece or one-piece design can also be provided, but this is not part of the present invention.

Here, too, a possibility of backlighting already mentioned above can be provided, in which case correspondingly thinner rings or ring sections, points or segments would then be optically displayable. In this way, information can be given about a setting of an operation or the course of a program of the device. This could also be shown inside or outside the ring or digitally in the display field or visually.

It is preferably provided that the cover is a glass plate. This has in particular a thickness of less than 10 mm, in particular less than 8 mm, preferably between 6 mm and 4 mm. This thickness on the one hand creates sufficient mechanical stability for embedding the components of the control element, and on the other hand enables a design which is nevertheless so thin that on the one hand good permeability of the optical signals of the display panel is made possible and the overall depth of the cover is minimized.

It is preferably provided that the top of the annular front part of the operating element is made of metal. For example, a metal layer can be applied here. However, it can also be provided that the front part is made entirely of metal. In the case of a design with a metallic upper side, a high-quality impression is given on the one hand, and low wear is ensured on the other hand.

It is preferably provided that the movable control element is arranged at least in regions within the surface area of the electronic display panel. The free movement of the control element on the one hand and the nevertheless multiple and digital or dynamically changing display of information on the electronic display panel very close to the control element can thereby be achieved.

It is preferably provided that the information to be displayed can be changed in at least one field area of the display field depending on the movement of the operating element. In this context, different menu interfaces can be displayed on the electronic display panel. The menu interfaces can be selected and selected depending on the rotary position of the control element. It can it can also be provided that the menu surfaces that are basically displayed are then displayed with further menu contents when selected by a specific rotary position of the control element. It is preferably provided that a menu surface to be displayed can be displayed on the display panel around the control element.

Furthermore, the invention relates to a household appliance with an operating device according to the invention or an advantageous embodiment thereof. The household appliance is designed in particular for the preparation of food or for the care of laundry or for cleaning dishes. In this context, exemplary household appliances can be an oven, a washing machine, a tumble dryer, a dishwasher, a refrigerator, a freezer or the like.

Further features of the invention result from the claims, the figures and the description of the figures. The features and combinations of features mentioned above in the description as well as the features and combinations of features shown only in the figures alone and / or the features and combinations of features only mentioned in the description of the figures are not only in the respectively specified combination but also in other combinations or on their own usable without leaving the scope of the invention.

Fig. 1

eine schematische perspektivische Darstellung eines Ausführungsbeispiels eines erfindungsgemäßen Haushaltsgeräts;

Fig. 2

eine schematische Frontansicht eines Ausführungsbeispiels einer erfindungsgemäßen Bedienvorrichtung;

Fig. 3

eine Schnittdarstellung durch Teilkomponenten der Bedienvorrichtung gemäß der Darstellung in Fig. 2;

Fig. 4

eine Explosionsdarstellung der Abbildung in Fig. 3; und

Fig. 5

eine Schnittdarstellung der Bedienvorrichtung gemäß Fig. 2.

Exemplary embodiments of the invention are explained in more detail below with the aid of schematic drawings. Show it:

Fig. 1

is a schematic perspective view of an embodiment of a household appliance according to the invention;

Fig. 2

is a schematic front view of an embodiment of an operating device according to the invention;

Fig. 3

a sectional view through subcomponents of the operating device according to the representation in Fig. 2 ;

Fig. 4

an exploded view of the figure in Fig. 3 ; and

Fig. 5

a sectional view of the operating device according to Fig. 2 .

Identical or functionally identical elements are provided with the same reference symbols in the figures.

In Fig. 1 a household appliance designed as an oven 1 is shown in a simplified schematic representation. The oven 1 comprises four cooking zones 2, 3, 4 and 5 and a cooking space 6 which can be closed by a door 7 which has a handle 8 on the outside. In the exemplary embodiment, an operating panel 9 with an operating device 10 is arranged above the door 7. Both the position and the configuration of the operating panel 9 are merely exemplary.

In Fig. 2 a front view of an embodiment of the operating device 10 is shown in a simplified representation. The operating device 10 comprises an electronic display field 11, which is designed as a display. Information can be displayed dynamically changeably on the display panel 11, which is delimited in terms of area by the edge or the boundary 12, which in the exemplary embodiment is rectangular. Different information in the form of letters and / or numbers and / or symbols can be displayed on such a screen.

The operating device 10 also includes an operating element 13, which in the exemplary embodiment is a rotary selector. As shown in Fig. 2 It can be seen that the rotary selector 13 with its surface dimensions viewed from the front and projected into the plane of the figure is arranged entirely within the surface 12a with the boundary 12 of the electronic display panel 11. It is thus virtually completely embedded in the flat dimensions of the display panel 11. The control element 13 can be moved relative to the display panel 11 due to its design as a rotary selector. By turning the control element 13, the operating conditions of the oven 1 associated therewith are set. As can be seen, an information display is formed adjacent to and at least in ring sections around the ring-shaped operating element 13 Fig. 2 in the form of symbols 14. The number of symbols 14 is only given as an example. It can also it should be provided that 14 numbers and / or letters are displayed instead of the symbols. In an alternative embodiment, the information around the ring-shaped control element 13 also represents, for example, menu interfaces which then define a certain folder structure. The information then displayed can, for example, represent a term for a folder which then contains further information. If such a folder is then selected by selecting in the design of the rotation of the control element 13, the menu content can be displayed in more detail.

As in the exemplary embodiment according to Fig. 2 It can be seen that two operating parts 16a and 16b are formed outside the surface 12a with the boundary 12 of the display panel 11. In the exemplary embodiment, these control parts 16a and 16b are designed as touch-sensitive control panels. On the one hand, they can functionally include switching the oven 1 on and off. In addition or instead of this, it can also be provided that at least one of the operating parts 16a or 16b is designed to set an information depth of a menu content to be displayed on the display panel 11. This means that the information as it is in Fig. 2 are represented as symbols 14 or as general menu terms of a menu surface, can be changed by one of the operating parts 16a or 16b. If necessary, it can be set that a term to be displayed for a folder is not the higher-level overall folder, but already represents a deeper folder structure and, for example, a subfolder is displayed as the basic setting.

It can also be provided that the operating part 16a and / or 16b is arranged within the surface 12a with the boundary 12 of the display panel 11.

In Fig. 3 is a perspective view of the in Fig. 2 indicated cover 15 partially shown in the form of a glass plate. The cover 15 is shown cut in the area of the control element 13. The control element 13 is shown in an exploded view. As can be seen, the control element 13 is constructed in several parts, it comprises an annular front part 17, which has a front or top 18. The top 18 is inclined obliquely inwards, so that the top 18 results in a funnel shape of the front part 17. The inclination towards the inside is preferably between 3 ° and 15 ° with respect to the plane in which the annular front part 17 extends. In the exemplary embodiment, the front part 17 is formed in one piece as an aluminum component.

The control element 13 also comprises a slide ring 19, which is arranged in the direction of a longitudinal axis A of the control element 13 below or behind the front part 17. It is also made in one piece and made from a particularly low-friction material. The front part 17 is rotatable relative to the slide ring 19. The slide ring 19 is fixed in place and thus fixed on the control panel 9, in particular glued or non-destructively attached to it by ultrasonic welding or by hot stamping.

The slide ring 19 and the front part 17 are held in an annular groove 22 formed in an outer side 21 of the cover 15, the slide ring 19 being connected to a slide plate 19a ( Fig. 5 ) preferably on a groove bottom 20 which, viewed in the axial direction and thus in the direction of the axis A of the operating element 13, is arranged to lie axially open to the front.

The rotational position relative to a stationary metal spider 23 is detected by magnets, which for example can also be arranged equidistantly in the circumferential direction of the front part 17. The metal spider 23 is as shown in FIG Fig. 3 also designed as a ring, which has a thickness of about 0.7 mm.

It is preferably provided that an annular groove is also formed on a rear side 24 of the cover 15, in which the metal spider 23 is arranged. With regard to the concept of metal spider, the ring shape with the spider-like or serrated elevations and / or radial extensions is included.

Between the groove 22 and the groove 26 formed on the rear side 24 ( Fig. 4 ) for the metal spider 23 there is still material of the cover 15 and thus glass material, so that in this regard no through hole or recess is not formed.

The thickness D of the cover 15, which in particular represents a rectangular glass plate, is 4 mm in the exemplary embodiment.

It can also be provided that the front part 17 and the slide ring 19 are designed to be transparent at least in some areas for light in the spectral range visible to humans. As a result, backlighting of at least ring sections of the front part 17 and the slide ring 19 can take place.

By means of a control unit (not shown), the rotational position of the slide ring 19 and the front part 17 relative to the metal spider 23 can be detected and since the specific rotational position and thus the relative position to the cover 15 and thus also to the display field 11 can be detected and the associated operating condition setting can be recognized and carried out .

In Fig. 4 is the representation in Fig. 3 shown in assembled condition. It can be seen that an outer edge 25 of the annular front part 17 protrudes approximately 0.5 mm from the outer side 21. The top 18, which runs obliquely inwards and downwards, can also be seen. In addition, the groove 26 for the metal spider 23 is also shown. With regard to an inner edge or a radially inner circumferential surface 27 of the annular front part 17, this can be flush with the outside 21. Because of the inwardly sloping downward upper side 18, it is then provided that this partial area of the outer side 21 enclosed by the operating element 13 is offset downward from the area of the outer side 21 formed outside the annular front part 17. However, it can also be provided that this inner edge 27 is also arranged so as to protrude slightly from this partial area of the outer side 21 enclosed by the front part 17. The cover 15 is arranged at least in regions in front of the electronic display panel 11 and is transparent to the optical signals and information from the display panel 11.

The partial area of the outer side 21 enclosed by the annular control element 13 is also designed as a display area of the display panel 11.

As already briefly mentioned above, the front part 17 is rotatable relative to the slide ring 19. The front part 17 and the slide ring 19 are as shown in FIG Fig. 5 , which is a sectional view along the section line VV in Fig. 2 shows by a guide 28 coupled. As a result, the front part 17 is rotatable relative to the slide ring 19. The guidance also ensures that the front part 17 cannot undesirably become detached from the slide ring 19 and thus cannot fall out undesirably, which has particular advantages when transporting the operating device 10.

The guide 28 comprises a groove 29 which is open in the radial direction of the operating element 13 and thus also in the radial direction of the front part 17 and which is open inwards in this radial direction. This means that the groove 29 is thus oriented such that it is in the axial direction and thus in the direction of the axis A ( Fig. 3 ) is closed and has its opening or its accessibility in the radial direction perpendicular thereto. In the exemplary embodiment, this radially open groove 29 is formed on the shell side 27 of the front part 17, which is located further inward in the radial direction.

In addition, the guide 28 also comprises at least one engagement element 30. The engagement element 30 can be an element partially formed in the circumferential direction around the axis A, but it can also be a completely circumferential engagement element.

The engagement element 30 is integrally formed on the slide ring 19. For this purpose, the slide ring 19 comprises, in addition to a slide plate 19a, a holding web 19b arranged thereon, on which this engaging element 30 is then formed. The engaging element 30 extends in relation to the holding web 19b in the exemplary embodiment in the radial direction of the operating element 13 further outwards, so that it can engage in or extend into the open groove 29 facing in this respect.

The engagement element 30 is preferably designed to be resilient and thus elastically deformable in particular in the radial direction. In particular, it is provided that the engaging element 30, when coupled to the groove 29, is arranged biased therein, in particular is arranged radially biased therein.

As shown in Fig. 5 As can be seen, the sliding plate 19a, viewed in the axial direction, is arranged behind the front part 17 when the operating device 10 is viewed from the front, and the front part 17 lies on a sliding surface 19c this slide plate 19a. This sliding surface 19c can be flat or can also be nubbed.

The control element 13 is guided in the control panel 9 and is centered and held there almost without play. This applies in particular to the front part 17. A material pairing which is suitable with regard to smooth movement guidance is preferably formed between the sliding plate 19a and the front part 17, in particular a rear element 17a of the front part 17 which bears directly against the sliding plate 19a.

In addition, openings in the slide plate 19a for producing the engagement element or elements 30 can thereby be designed without impairing the safety requirements, for example the accessibility to live parts.

A positive fit is preferably formed between the engagement element 30 and the groove 29 and, moreover, a positive fit is also realized between the sliding surface 19c and the rear element 17a. The dimension of the positive connection in the radial direction is preferably designed such that freedom from play is achieved and, on the other hand, the user can easily operate the ring. The dimension of the form fit in the axial direction is in particular designed such that withdrawal forces are large enough so that the front part 17 is held securely on the device 1 even during relative movements of the control panel 9 or during transport and are small enough to hold the front part 17, for example for cleaning purposes to be able to remove.

It can also be provided that the groove 29 is formed on the slide ring 19 and, in particular on the jacket side 27, a radially inward engagement element 30 is formed, so that in comparison to the illustration in FIG Fig. 5 the inverse configuration is realized.

Reference list

1

Home appliance

2nd

Cooking zone

3rd

Cooking zone

4th

Cooking zone

5

Cooking zone

6

Cooking space

7

door

8th

Handle

9

Control panel

10th

Operating device

11

Display field

12th

Boundary or margin

12a

Area

13

Control element

14

Symbols

15

cover

16a, 16b

Control units

17th

Front part

17a

Back element

18th

Top

19th

Slide ring

19a

Sliding plate

19b

Landing stage

19c

Sliding surface

20th

Groove bottom

21

Outside

22

Groove

23

Metal spider

24th

back

25th

Outer edge

26

Groove

27

Shell side

28

guide

29

Groove

30th

Engaging element

Claims (13)

1. Operating device (10) for a household appliance (1), with an electronic display field (11) and an operating element (13), which can be moved in relation to the display field (11) in order to set operating conditions of the household appliance (1), wherein the operating element (13) is embodied with multiple parts and has a sliding ring (19) and a ring-shaped front part (17) resting thereon, wherein the operating element (13) is embodied as a ring, characterised in that the front part (17) and the sliding ring (19) are coupled to a guide (28) and by means of the guide (28) the front part (17) can be rotated in a guided manner in relation to the sliding ring (19), wherein the guide (28) has a groove (29) which opens in the radial direction of the operating element (13), and at least one engaging element (30), wherein the engaging element (30) is embodied to be resilient in the radial direction of the sliding ring (19) and of the front part (17) and the engaging element (30) is arranged in, and prestressed in the state coupled to, the groove (29), in particular arranged radially prestressed therein.
2. Operating device (10) according to claim 1, characterised in that the groove (29) on the front part (17) is embodied on a radially inner shell side (27) of the front part (17).
3. Operating device (10) according to one of the preceding claims, characterised in that the sliding ring (19) has a slide plate (19a), which, in the axial direction of the operating element (13), is arranged behind the front part (17), and has a holding web (19b), which extends in an axial direction so as to overlap with the front part (17), wherein at least the engaging element (30) which extends radially is embodied on the holding web (19b) and extends in the radial direction into the groove (29).
4. Operating device (10) according to one of the preceding claims, characterised in that the sliding ring (19) is arranged with a fixed position on a control panel (9).
5. Operating device (10) according to one of the preceding claims, characterised in that the operating element (13) is embodied as a rotary selector.
6. Operating device (1) according to one of the preceding claims, characterised in that the front part (17) has a top side (18) which faces away from the sliding ring (19) and which is inclined inward compared to a plane in which the front part (17) extends.
7. Operating device (1) according to one of the preceding claims, characterised in that the operating element (13) has magnets, wherein an assigned operating setting of the household appliance (1) can be acquired when the magnets interact with stationary metal elements, in particular a ring-shaped metal peen (23), as a function of a relative movement of the operating element (13), in particular of the ring-shaped front part (17), in relation to the metal elements.
8. Operating device (1) according to claim 7, characterised in that the magnets are attached to, in particular embedded in, the rear of the front part (17).
9. Operating device (1) according to claim 7 or 8, characterised in that the stationary metal elements are a ring-shaped metal peen (23), the diameter of which essentially corresponds to the diameter of the sliding ring (19) and/or of the ring-shaped front part (17).
10. Operating device (1) according to one of the preceding claims, characterised in that the operating element (13) is embedded in a plate-shaped cover (15) which is arranged in front of the display field (11) and is permeable in particular to the light of the display field (11).
11. Operating device (1) according to claim 10, characterised in that the ring-shaped front part (17), in particular at least its outer edge, projects in an elevated manner beyond an exterior (21) of the cover (15), in particular projects by less than 1.5 mm, in particular less than 1 mm.
12. Operating device (1) according to one of the preceding claims, characterised in that the engaging element (30) is embodied integrally on the sliding ring (19).
13. Household appliance (1) with an operating device (10) according to one of the preceding claims.

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