Domestic appliance for the care of laundry, with a measuring system for the multiple measurement of the loading state of a laundry drum, of local configuration

Abstract

The invention relates to a domestic appliance for the care of laundry, comprising a housing, a vibration system comprising a laundry drum and a lye container, which is vibrationally supported in the housing by a support device, which has a support spring system with a plurality of support springs, which is vibrationally coupled in the housing to the support springs, the support device has a damping system with at least one damper, which is coupled in the housing to the damper, and a measuring system for measuring the laundry load of the laundry drum. The measuring system has a displacement measuring cell, by which the movement displacement of the vibration system during the load measurement can be measured, and a further measuring cell, by which the force action of the vibration system on the damper during the load measurement can be measured, the displacement measuring cell and the further measuring cell are arranged locally on a common component of the domestic appliance, which changes depending on the load when the laundry drum is loaded.

Description

Technical Field

[0001] One aspect of the invention relates to a household appliance for clothing care. The appliance has a housing. Furthermore, the appliance has a vibration system comprising a washing drum and an lye container. The vibration system is movable within the housing via a support device, specifically vibratoryly supported. The support device has a support spring system with multiple support springs. Through this system, the vibration system is vibratoryly coupled, specifically suspended, within the housing. The support device also has a damping system with at least one damper. Through this damping system, the vibration system is coupled, specifically damped, within the housing. Additionally, the appliance has a measuring system for measuring the load of clothes on the washing drum. This measuring system may also be referred to as a load measuring system. Background Technology

[0002] Household appliances for clothing care, such as washing machines, are known. In these known household appliances, the measuring systems are typically distributed. Generally, a measuring unit is placed in the support spring system for displacement measurement. The deflection displacement of the suspension system springs can then be determined, and the loading state of the washing drum can be inferred from this. Furthermore, in such household appliances, it is known to perform force measurements on the damping system at a location remote from the support spring system.

[0003] The vibrating system typically consists of a washing drum and an lye container, and preferably also includes a drive motor and a counterweight, if present. It is suspended by multiple springs, forming a spring scale. As clothes are loaded into the washing drum, the weight of the vibrating system increases, causing it to sink, typically by a few tenths of a millimeter per kilogram.

[0004] Parallel to the spring, there are other forces connecting the vibrating system and the housing, which are constituted by the aforementioned dampers. Therefore, to measure the loaded mass between the vibrating system and the housing, it is meaningful to measure the forces in the spring and the dampers. Neglecting the damper forces will result in relatively large measurement errors.

[0005] Force measurements are typically performed using force sensors. These sensors may consist of a bending beam that deforms under the force being measured. This minute deformation is converted into an electrical signal by a suitable sensor. Strain gauges are commonly used for force measurements. Other sensors suitable for force measurement are based on the piezoelectric effect.

[0006] Displacement measurement is typically performed using displacement sensors. These sensors usually have two sensor components that can move relative to each other in one or more dimensions. As these two sensor components move relative to the displacement being measured, this relative motion can be converted into an electrical signal. Examples of such displacement sensors are based on the time-of-flight measurement principle, which determines the signal propagation time between the two sensor components. Inductive or capacitive sensors can also be used for this type of displacement measurement.

[0007] The proposed solutions require the installation of separate measuring units at different locations within the household appliance, thus increasing the installation workload. Furthermore, due to the aforementioned reasons, the measurement of each quantity may be partially limited, leading to inaccuracies. In particular, the need for different measuring electronic devices and the subsequent measurements and evaluations at different locations are cumbersome. Summary of the Invention

[0008] The objective of this invention is to provide a household appliance for clothing care in which the measurement of the load on the washing drum is improved.

[0009] This task is accomplished by a home appliance having the features described in the preferred technical solution.

[0010] One aspect of the invention relates to a household appliance for clothing care. The appliance has a housing. Furthermore, the appliance has a vibration system comprising a washing drum and an lye container. The vibration system is movably, and particularly vibratoryly, supported within the housing by a support device. The support device has a support spring system with multiple support springs. Through this support spring system, the vibration system is vibratoryly coupled, and particularly suspended, within the housing. The support device also has a damping system with at least one damper, and particularly multiple dampers. Through this damping system, the vibration system is coupled, and particularly damped, within the housing. Additionally, the appliance has a measuring system for measuring the load of clothes on the washing drum. This measuring system may also be referred to as a load measuring system.

[0011] The measuring system includes a displacement measuring unit that measures the downward displacement of the vibrating system during loading. This downward displacement is specifically determined at least along the vertical direction and thus along the height of the household appliance. The system also includes a separate measuring unit that measures the force exerted by the vibrating system on the damper during loading, particularly under the same load. The displacement measuring unit and the separate measuring unit are partially arranged on a common component of the household appliance. This component is designed such that it can vary with the load during loading of the washing drum. Specifically, this variation is a change in the length of the component along its longitudinal axis. The longitudinal axis extends along the direction in which the component has its maximum dimension and / or the direction in which the system side is predetermined to change.

[0012] Such a measurement system can improve the measurement of loading conditions. By locally integrating the measurement system with a displacement measurement unit and a separate additional measurement unit, a compact structure with two different measurement units can be achieved. This realizes a synergistic effect of components that can now be used together and therefore for both measurement units. Furthermore, measurement accuracy can be improved by performing or coupling different measurements with the same component through the measurement unit.

[0013] Specifically, it is stipulated that the measurement system is configured to spatially and functionally merge the displacement measurement of subsidence and the force measurement of force action, particularly on the same common component.

[0014] In one embodiment, the component is designed to vary in length along its longitudinal axis depending on the load. Therefore, the component expands or contracts along its longitudinal axis depending on the loading state of the washing drum. The coupling of the measuring unit to this component, which varies linearly in one direction, particularly supports the aforementioned advantages.

[0015] The component can be arranged at an angle to the vertical line with its longitudinal axis. The angle between the longitudinal axis of the component and the vertical line is typically between 10° and 60°, particularly between 20° and 50°. All individual angle values ​​between the boundaries of this range should also be considered disclosed. Therefore, in this respect, all ranges of angle values ​​stepping upwards and downwards in unit values ​​should be considered disclosed.

[0016] In particular, the components of the displacement measuring unit are arranged outside the components, especially outside the dampers, and particularly outside the damper sections that are axially guided to each other. This specifically means that the components of the displacement measuring unit are arranged beside, particularly on the side, and along the axial direction of the components, extending particularly along the entire length of the components. One component of the displacement measuring unit can be coupled to one end of the components, particularly directly coupled.

[0017] In one embodiment, the component coupled to which the measuring units perform their respective measurements is a damper of the damping system. The damper itself is a relatively rigid component and, in this context, is also preferably suited for connecting these measuring units. Because the damper, due to its structure, has at least two damper sections that are axially movable relative to each other and meshing with each other, particularly simple, i.e., relatively linear, component variations can also be achieved here, depending on their respective loading. Therefore, it is on this component that performing these different measurements with the measuring units can be particularly advantageously achieved, performed simultaneously, and thus improve the accuracy of the measurement results.

[0018] Alternatively, the measurement system can be constructed on the first damper of the damping system, and no other measurement system exists. However, it is also possible that a first measurement system, as described above, is constructed on the first damper of the damping system, and a second measurement system is constructed on the second damper of the damping system. This allows for further accuracy in the measurement, although this involves a multiple and therefore redundant design of the measurement system. Alternatively, the measurement system, as described and explained above, can be arranged on or coupled to each of the dampers of the damping system.

[0019] In one embodiment, in addition to the at least one measuring system described above, located on a component, particularly on a damper in the damping system, an additional measuring unit can be connected to at least one support spring in the support spring system. This allows for a single displacement measurement, whereby the subsidence displacement of the vibration system is determined based on the change in the length of the support spring.

[0020] In one embodiment, the additional measuring unit is configured such that the force acting on the component is converted into a displacement measurement along the action chain of the additional measuring unit, thereby converting force measurement into displacement measurement. Therefore, the additional measuring unit is designed to automatically implement a measurement principle along the action chain, in which one parameter, i.e., force, is converted into another parameter, i.e., displacement. This particularly advantageously avoids the aforementioned drawbacks of purely force measuring units. In particular, even minute movements can now be measured significantly better.

[0021] The advantage of accurate measurement is supported by locally treating both different measurements as displacement measurements at the ends of their respective measurement chains. A suitable measurement system mechanism in this regard enables the conversion of these measurements to a suitable range for the sensor used, preferably an inductive sensor with a coil formed on a circuit board.

[0022] The resulting synergistic effects particularly relate to the mechanical conversion from force and displacement to two scalable displacement measurements, and the resulting simplification of the measurement electronics. For example, coils of the measurement electronics, preferably integrated on a circuit board and preferably present therein, combined with specific elements, preferably conductive metallic amplifying levers and also referred to as displacement amplifying levers, can enable distance measurements of sensors or additional target elements (such as magnets in Hall sensors) without the need for external wiring. Furthermore, integrated circuits offer the possibility of miniaturization and low cost, allowing multiple measurement channels to be handled directly in a common component. When using the common measurement principle as shown in the proposed measurement system, compensation for interferences, such as temperature effects, humidity effects, and undesirable electromagnetic compatibility effects, is simplified. Additional synergistic aspects are reflected in mechanical functions, such as mechanical supports or resilient structures for the sensors. Moreover, housings and wiring, which are widely distributed and redundant in the conventional principles described above, are no longer necessary, and in the proposed measurement system, these components are locally combined and used in an integrated scheme.

[0023] Therefore, in one embodiment, the displacement measuring unit and other measuring units are integrated into a single overall measuring unit coupled to the component. Through this overall measuring unit, the two described measurement principles are partially merged. The advantages achieved thereby have been fully explained above.

[0024] In one embodiment, the displacement measuring unit includes a bending beam. This bending beam is designed to bend according to changes in the components caused by the loading of clothes into the washing drum, particularly changes in the length of the components. In this respect, bending beams are advantageous elements; they are simple in structure yet still possess loading capacity and are suitable for the measurement principle.

[0025] In one embodiment, the displacement measuring unit includes a displacement amplifying lever. This displacement amplifying lever is coupled to the bending beam of the displacement measuring unit. Furthermore, the displacement amplifying lever is arranged adjacent to the electromagnetic interaction member of the displacement measuring unit to perform electromagnetic interaction, particularly non-contact interaction, with the electromagnetic interaction member for displacement measurement. This is particularly advantageous because it allows the minute bending of the bending beam to be amplified by the coupled displacement amplifying lever, thus, in the measurement chain, when the displacement amplifying lever interacts with the electromagnetic interaction member, a conversion to a larger displacement occurs, which can then be identified, or more precisely, by the electromagnetic interaction member and subsequently by the measuring electronics. Therefore, this embodiment with the displacement amplifying lever is particularly advantageous and simple. Only one such additional element is needed, cleverly positioned in the action chain, both between the bending beam and the electromagnetic interaction member, and coupled to the bending beam, such that the bending displacement of the bending beam induced by loading is correspondingly amplified and converted into a spacing displacement between the displacement amplifying lever and the electromagnetic interaction member.

[0026] In one implementation, the coupling is configured such that a change in the bending displacement of the bending beam results in a greater change in the distance between the displacement amplification lever and the electromagnetic interaction member, as already described.

[0027] In one embodiment, the displacement amplification lever is constructed as a long, thin strip. This results in a particularly simple structure and space-saving installation. Furthermore, this construction makes it relatively rigid and shape-stable, so the corresponding movement of the bending beam does not cause deformation of the displacement amplification lever itself, thus avoiding measurement distortion.

[0028] Alternatively or additionally, the displacement amplifying lever can be integrally formed with the bending beam. This is another highly advantageous implementation because it reduces the number of components. This integral design particularly advantageously achieves extremely direct motion coupling between the bending beam and the displacement amplifying lever. Therefore, relative motion between these components can be avoided. This allows for the particularly precise and direct transmission of the bending beam's motion to the electromagnetically interacting components via the displacement amplifying lever.

[0029] In other words, this overall component (including the displacement amplifying lever and the bending beam) is formed in an L-shape. Therefore, in this embodiment, the displacement amplifying lever and the bending beam are not coaxial, nor are they the only common straight members. This non-linear construction allows for a space-saving solution and provides a separate position for the measuring electronics relative to the bending beam, while still maintaining the high-precision measurement principle. The angle between the bending beam and the displacement amplifying lever can be between 40° and less than 130°. For example, it can have an angle between 80° and 100°.

[0030] In one embodiment, the displacement amplifying lever extends from one free end of the bending beam. Therefore, the amplifying lever is coupled at the end of the bending beam. In particular, the displacement amplifying lever extends freely and cantileveredly from the bending beam. This allows the aforementioned advantages to be better realized.

[0031] In another embodiment, the bending beam and the displacement amplification lever can be arranged in series with each other, and in particular, form a complete linear overall element.

[0032] In one embodiment, the displacement measuring unit includes a spring. This spring can be helically wound. The spring is preferably coupled to a bending beam at its first end. Specifically, the spring is directly connected to the bending beam at its first end. The spring is preferably coupled to a component portion that is axially movable along the longitudinal axis of the component at its second end. Specifically, the second end is directly connected to this component portion. This component portion can be an axially movable damper portion of a damper in a damping system. This damper portion is particularly the one facing the lye container and the washing drum, i.e., arranged closer to the other component portion, particularly the other damper portion of the damper. The two component portions of the component are movable relative to each other in the longitudinal direction of the component and are directly coupled to each other. They are particularly directly guided to each other. This is particularly true in dampers with two damper portions. Specifically, the longitudinal axis of the spring is oriented parallel to the longitudinal axis of the component. This scheme achieves a particularly advantageous realization of direct displacement measurement on the damper. In this displacement measuring unit, unlike the other measuring units described, only displacement measurement is performed. The displacement measurement unit does not include initial force measurement along the action chain or measurement chain, as is preferred in other measurement units. The entire action chain or measurement chain of the displacement measurement unit is specifically designed here to perform displacement measurement.

[0033] In one embodiment, the additional measuring unit includes a further bending beam to which the component is directly coupled. Specifically, the bending beam is directly coupled to a second component portion that is axially movable along the longitudinal axis of the component and positioned closer to the bending beam than the first component portion. These two component portions are directly connected and axially movable relative to each other. These component portions are, in particular, damper portions. The first damper portion is the damper portion closer to the bending beam and therefore, in particular, the damper portion farther from the washing drum and lye container (compared to the second damper portion). Also through this specific arrangement, the action chain of the aforementioned measurements, particularly the conversion of force measurements to displacement measurements, is advantageously supported and refined.

[0034] In one embodiment, the bending beam of the displacement measuring unit and another bending beam of another measuring unit (which are two independent bending beams) are connected to the base element of the measuring system. This base element can be a plate. In particular, these two bending plates are integrally connected to or manufactured as a single piece with the base element. This reduces the number of components and achieves a particularly compact structure for the element.

[0035] In one embodiment, the base element is arranged on the bottom of the household appliance. Specifically, the base element is fixed to this bottom. Additionally or alternatively, two curved beams are arranged spaced apart. Therefore, they are oriented non-contactly to each other. The two curved beams are specifically arranged to extend from the base element in the same direction. They can be arranged parallel to each other. This also supports a compact structure, allows for the close proximity arrangement of the measuring unit and other elements of the other measuring unit, and enables the measurement electronics to be mounted in a particularly advantageous, extremely localized and concentrated manner, which can interact closely to the two measuring units, so as to be particularly capable of interacting with two independent displacement amplification levers.

[0036] In one embodiment, the additional measuring unit includes an additional displacement amplifying lever. This additional displacement amplifying lever is coupled to the additional bending beam. Furthermore, this additional displacement amplifying lever is arranged adjacent to an additional electromagnetic interaction member of the additional measuring unit so as to enable a measuring interaction with the electromagnetic interaction member. In particular, this supports to a particularly high degree the already advantageously described conversion of force measurement (especially non-contact) into displacement measurement.

[0037] The arrangement of the additional displacement amplification lever relative to the additional bending beam can correspond to that described for the first bending beam and the first displacement amplification lever of the displacement measuring unit. This involves the geometry and / or orientation and / or the integral design with the bending beam and / or the orientation relative to the bending beam.

[0038] In one embodiment, the displacement amplifying lever is constructed in a straight line, particularly a completely straight line. In another embodiment, it may have obtuse angles between the displacement amplifying lever components, rather than being formed in a straight line. Furthermore, in another embodiment, it may have acute angles between the displacement amplifying lever components and thus also be formed in a non-straight line. In particular, this relates to those portions of the displacement amplifying lever that are directly adjacent to their respective curved beams, especially those directly coupled to them, and particularly those integrally formed with them.

[0039] Electromagnetic interaction components, particularly coils, are used in measuring electronic devices. In this context, a coil may be provided for interaction with a displacement amplifying lever. Another coil may be provided for interaction with another displacement amplifying lever. These two coils are preferably arranged adjacent to each other. They are preferably constructed on a common circuit board.

[0040] Two preferred and independent displacement amplification levers (which are also arranged apart and non-contact with each other) are, in one embodiment, oriented in the same direction and arranged parallel to each other in the basic position. They are preferably both freely cantilevered.

[0041] Therefore, combining an elastic structure (which can be achieved through a bending beam) with other mechanical elements characterized by displacement amplification levers is a particularly advantageous design approach, thereby adjusting the range of motion to be best suited to the detection range of the sensor (i.e., a measurement electronics device with a coil).

[0042] In particular, examples of this include, for instance, the mechanical pressure divider described above and the displacement amplifying lever. Here, the displacement amplifying lever converts the minute deformation of the elastic structure (especially the bending beam) into a scalable large motion at the end of the measuring chain, where the position change is then detected, for example, by an inductive sensor in a measurement technique.

[0043] To convert the motion at the end of the measuring chain, i.e., one end of the displacement amplifying lever, into an electrical signal, a sensor suitable for displacement measurement is preferably used. This is, for example, a Hall sensor, a capacitive sensor, or an inductive sensor. Inductive proximity sensors are particularly suitable. These sensors can measure the distance to a non-contact but still adjacent conductive counterpart (e.g., formed by the displacement amplifying lever) by the frequency of a coil connected to an oscillating circuit. The coil used here is constructed, for example, as a planar printed coil on a circuit board. Such inductive proximity sensors with printed coils and suitable evaluation electronics are particularly advantageous. By using these sensor types, manufacturing and installation become very simple because all the electrical components of the sensor are located on the circuit board, and the counterpart only needs to meet low conductivity requirements in this regard. In this respect, the conductivity can be less than 5 × 10⁻⁶. 5 S / m. This can be easily achieved using common, even very low-cost, metallic materials. Depending on the proximity of the conductive material, especially the displacement amplification lever, the inductance of the coil, i.e., the electromagnetic interaction component, that interacts electromagnetically with it will change, thereby altering its characteristic oscillation frequency.

[0044] A region is created on both sides of the coil, in which the frequency of the oscillating circuit can be detuned by introducing the conductive counterpart, particularly a conductive displacement amplification lever, and the distance can be inferred accordingly. The available measurement range is on the order of the coil diameter, where the frequency and achievable resolution decrease approximately exponentially with distance. It is advantageous to design the maximum measurement distance to be about 50% of the coil diameter. The coil is preferably laid on all layers of the circuit board, so that the achievable inductance can be multiplied by n when the number of layers is n (an integer greater than 1). Similarly, in one embodiment, a single-layer trace may be advantageous, for example, with a diameter between 17 mm and 23 mm, particularly between 19 mm and 21 mm, and / or having 8 to 12 turns, particularly between 9 and 11 turns. Here, a maximum distance between the conductive counterpart and the coil of 5 mm to 10 mm is advantageous. A preferred minimum distance is particularly between 1.5 mm and 2.5 mm, particularly 2 mm. The displacement resolution is in the range of a few micrometers to a few hundredths of a millimeter.

[0045] Generally, a bending beam should be understood as a substantially planar member composed of a sufficiently elastic material, clamped on one or possibly both sides, which bends out of its plane when at least one component of force perpendicular to the plane of the member (which may also be the surface of the bent member) is applied at a location away from the clamping point of the bending beam. The deformation, in particular, is approximately proportional to the force or at least increases strictly monotonically with respect to the same amplitude of motion, so the force causing the deformation can be inferred by measuring the deformation. In one embodiment, the member may substantially have a cuboid shape, with its length and width being much greater than its thickness, for example, by a factor of 7, so that the deformation of the bending beam occurs substantially in one dimension or can be described in one dimension.

[0046] The basic element (on which two bending beams are preferably arranged) is particularly integrally arranged and can also be called a damper clamp. For example, it is mounted on the base plate of a household appliance, i.e., the base plate of the housing. As mentioned above, one end of one of the two bending beams can be directly connected to the lower end of the component, particularly the damper, so that the longitudinal force in the component is directly transmitted as bending to the bending beam, or, in a linear approximation, the proportional structure of the damper and the bending beam is arranged at an angle to each other in this embodiment.

[0047] The other of the two preferred curved beams is connected to the upper component section, particularly the upper damper lug and thus the upper end of the upper damper section, via a spring preferably helically wound, especially under preload. These two preferably series-connected elastic elements, namely the curved beams and the spring, thus act as a mechanical pressure divider. The sinking or lifting of the vibration system causes a substantially proportional change in the length of the damper. This results in a quasi-synchronous change in the length of the spring, and through its spring constant, a change in force, which is accompanied by deformation of the associated curved beam.

[0048] The preload of the spring ensures, for example, that the spring force in the helical spring does not cross zero during the movement of the vibration system and changes in the length of corresponding components (especially dampers), thus maintaining tension throughout the entire range of motion, resulting in accurate and precise measurements. They therefore have no free play or hysteresis. Furthermore, there is no clicking sound or unhooking of the spring lugs.

[0049] In one implementation, a stop system can be specified to prevent the displacement amplification lever from directly impacting the measuring electronics, particularly the coil. Another possibility is to design the components to allow them to move freely throughout their entire range of motion. Avoiding such stops also prevents wear and / or clicking and / or damage to the components.

[0050] The displacement amplification achieved by the aforementioned displacement amplification lever, which converts the displacement change of the bending beam into a larger distance between the displacement amplification lever and the measuring electronic equipment, can have an amplification factor greater than or equal to 5, and particularly greater than or equal to 10. The amplification factor can be such that the amplification can be increased by up to 20 times. Therefore, a deflection of a few hundredths of a millimeter can be achieved at the end of the displacement amplification lever, which can be easily and accurately measured by a sensor, especially an inductive sensor.

[0051] In one embodiment, the width of the displacement amplification lever, particularly the width of the portion that should interact electromagnetically with the electromagnetic interaction member, can be greater than or equal to 10%, particularly greater than or equal to 20%, particularly greater than or equal to 25%, particularly less than or equal to 50%, particularly less than or equal to 40%, particularly between 27% and 33%, wider than the diameter of the coil located on the measuring electronic device. In particular, the material of the displacement amplification lever is chosen such that at least the area interacting with the electromagnetic interaction member is conductive. For example, metals, particularly steel, such as C35 steel, can be mentioned here. A design consisting of a non-conductive carrier, such as a non-conductive plastic, then the carrier is, for example, at least partially covered with a metallic element, such as a metallic coating or foil. For example, copper or copper-containing materials can be provided as the coating or foil.

[0052] The measuring range is designed, for example, for loads up to 10 kg of clothing. When unloaded, i.e., with an empty washing drum, the system's damper extends relatively far. At the upper end of the loaded range, the damper sinks a few millimeters. The associated measuring range is closer to the upper end of the entire range of motion; therefore, a preferred variant of displacement measurement involves increasing the distance between the displacement amplification lever and the coil as the washing drum and thus the vibrating system sink.

[0053] Preferably, the coils are constructed as wound coils, particularly helical coils. They are arranged, in particular, non-contact, but directly opposite one end of the displacement amplifying lever. Electromagnetic waves of a defined frequency emitted by the coils induce eddy currents in the material of the displacement amplifying lever, which in turn generate a field opposite to that generated by the coils. Due to the weakening of the field, the effective inductance of the coils decreases, which in turn leads to an increase in the oscillation frequency. Depending on the change in position between the displacement amplifying lever and the coils, the induced current changes, and consequently, the inductance of the coils also changes. The inductance is therefore directly related to the displacement amplifying lever, particularly the part of the displacement amplifying lever that interacts with the electromagnetic component, i.e., the coils, and the distance between the coils. Axial or longitudinal proximity is more advantageous than radial or lateral proximity because the change is approximately an order of magnitude larger with axial proximity.

[0054] Reaching a distance of 50% of the coil diameter is advantageous to obtain sufficient resolution. Typical inductance variation is 4 µH / mm in the near region (e.g., at a distance of 20% of the coil diameter) and decreases to 0.2 µH / mm beyond 50% of the coil diameter.

[0055] The measured values ​​can be weighted and added together to obtain the total force change, and thus the value of the change in roller loading.

[0056] Alternatively, the portion of the displacement amplification lever that interacts with the electromagnetic interaction component can be made to taper towards its end to save material. The asymmetry in displacement measurement can be utilized, for example, by adjusting the displacement amplification lever's direction of movement relative to the bending beam. This allows for better measurement.

[0057] In one embodiment, the electromagnetic interaction components of the measuring electronic device are formed in a two-dimensional geometry and thus extend particularly in a plane. The geometry of the coil can be helical, rectangular, square, polygonal, or elliptical. It is possible, preferably, that multiple coils can be arranged on a common circuit board or on different circuit boards. This can also be achieved using interconnected flat cables. This allows for mechanical flexibility and particularly customized arrangements. The electromagnetic interaction components, especially the coils, can have different mechanical and electrical structures. For example, they can vary in terms of coil diameter parameters, fill factor, number of turns, wire width, wire spacing, and the number of layers on the electronic device. The number of layers can range from one to sixteen. An advantageous embodiment can be, for example, a single-layer to four-layer coil with a diameter between 1 mm and 25 mm and a number of turns between 5 and 40. Advantageously, a single-layer coil with a diameter of 19 mm to 21 mm, 12 to 14 turns, wires 0.008 to 0.12 mm wide, and wire spacing values ​​of 0.45 mm or 0.55 mm are preferred. These wires can also be applied to a metal layer, such as a copper layer. The thickness of this layer can be, for example, between 30µm and 40µm, especially 35µm.

[0058] When using strain gauges, i.e., bending beams, the achievable force measurement resolution is directly proportional to the strain in the bending beam. Strain is equivalent to stress, meaning that, according to Hooke's Law, strain is proportional to stress. Therefore, if a sufficiently high strain must be generated even with a small force, such as 1 N, then a significantly larger strain and therefore stress will be generated when the maximum expected force, such as 100 N, is applied. Consequently, a correspondingly high strength and therefore a high yield strength of the material are required to meet the measurement resolution requirements and to prevent drastic deformation during its lifespan. High-strength materials are generally more expensive than low-strength materials and may have unfavorable properties in terms of requirements.

[0059] However, in the illustrated invention, deflection is measured instead of strain directly. Therefore, by appropriately designing the bending beam, sufficient deflection for the desired measurement resolution can be achieved even at relatively small strains. Deflection increases cubically with the length of the bending beam, while the bending moment, and therefore the bending stress, increases only linearly with the length of the bending beam. Thus, for example, two bending beams of the same thickness (i.e., the same plate thickness) but different lengths and widths will experience different deflections at the same strain. The longer and wider bending beam will bend more than the shorter and narrower one. If, for example, the length and width are doubled, four times the deflection is obtained at the same strain compared to the shorter, narrower bending beam. Furthermore, the deflection can be scaled using simple methods, such as the preferred displacement amplification lever, which is impossible in pure strain measurements.

[0060] Furthermore, this invention also achieves the advantage of utilizing high synergy, thus enabling a significant cost reduction in the measurement system compared to the example mentioned at the beginning as prior art. The two sensors for the measuring electronics, and particularly the two coils, employ the same measurement principle and are of the same order of magnitude. Here, synergy also arises in energy supply, data preparation, installation, and other aspects. By converting the three-dimensional range of motion into the one-dimensional tension of the preferred voltage divider spring, the influence of unwanted degrees of freedom of components, particularly dampers, on the measured values ​​is reduced or eliminated. In this context, interference from the lateral motion of the vibrating system in the horizontal plane can be reduced or eliminated. Moreover, it is easier and more accurate to optimize the measurement results within the sensor measurement range with optimal resolution. The advantageous construction also enables robust design of the bending region, as less strain is required compared to direct measurement on the bending tongue, i.e., the bending beam itself. This measuring system and the electronic equipment can preferably also be mounted above the splash level of such household appliances.

[0061] In general, what is particularly advantageous about this structure is that the two parameters to be measured are coordinated by a measurement system with two measurement units in such a way that the two measurements have similar ranges of motion for their respective, in particular, electromagnetically interacting components, and these ranges are accompanied by displacements much larger than those in typical force measurements, such as in the case of typical force sensors, such as strain gauges.

[0062] Therefore, in particular, the bending beam and displacement amplification lever of the other measuring unit are coordinated with the spring, bending beam and displacement amplification lever of the displacement measuring unit.

[0063] Therefore, the two measurements are very close in space, oriented in the same direction, and have similar amplitudes of motion. Thus, these two signals can be measured with low electronic consumption using at least two adjacent inductors on a circuit board. Attached Figure Description

[0064] The embodiments of the present invention will be described in detail below with the aid of schematic diagrams. The accompanying drawings are as follows.

[0065] Figure 1 A schematic diagram illustrating one embodiment of a household appliance according to the present invention is shown.

[0066] Figure 2 Showing according to Figure 1 A schematic diagram of some components of a household appliance and an embodiment of a measuring system for measuring the load of laundry in a washing machine drum.

[0067] Figure 3 A schematic diagram illustrating one implementation of such a measurement system is shown, such as... Figure 2 As generally shown in the diagram.

[0068] Figure 4 A schematic diagram illustrating a further embodiment of some components of a measurement system for loading measurement according to one embodiment of the present invention is shown.

[0069] Figure 5 A schematic diagram showing yet another embodiment of the components of the measurement system according to the present invention is shown.

[0070] Figure 6 A schematic diagram of components of a measurement system according to another embodiment of the present invention is shown.

[0071] Figure 7 A schematic diagram of the components of one embodiment of the measurement system according to the present invention is shown.

[0072] Figure 8 A schematic diagram of yet another embodiment of the measurement system according to the invention is shown, illustrating one embodiment of a household appliance according to the invention. Detailed Implementation

[0073] In the accompanying drawings, elements that are identical or have the same function are labeled with the same reference numerals.

[0074] exist Figure 1 The diagram illustrates a household appliance 1 for clothing care. This appliance 1 is particularly a washing machine. It can also be a washer-dryer combo. The appliance 1 has a housing 2. A vibration system 3 is arranged within the housing 2. The vibration system 3 has an alkali container 4 and a washing drum 5. It may also have other components, such as a drive motor and a counterweight. The vibration system 3 is vibratingly supported within the housing 2 by a support device 6. The support device 6 has a support spring system 7. In this embodiment, the support spring system 7 has multiple support springs 8. For example, three such support springs 8 can be provided. The vibration system 3 is vibratingly suspended within the housing 2 by this support spring system 7. Figure 1 As shown, these support springs 8 act from above on the vibration system 3 in the height direction (y direction) of the household appliance 1. In one embodiment, each support spring 8 is connected to the housing 2 at its first end, particularly to the top wall 9. The second end of each support spring 8 is coupled from above to the vibration system 3, particularly connected to it.

[0075] Furthermore, the support device 6 also has a damping system 10, which includes a plurality of dampers 11. The dampers 11 are hydraulic or pneumatic dampers. They may also be friction dampers. Preferably, they have a first damper portion 11a and a second damper portion 11b directly connected to and independent of the first damper portion. The damper portions 11a and 11b are arranged coaxially along the longitudinal axis A of the damper 11 and are movable relative to each other along the direction of the longitudinal axis A. They can thus be guided accordingly, allowing the damper 11 to expand and compress along the direction of the longitudinal axis A.

[0076] Vibration system 3 is mounted in housing 2 via damping system 10. This means that vibration system 3 is seated on damping system 10 from above in the height direction. Multiple dampers 11, for example, three in number, are connected to vibration system 3 at their upper ends and to the bottom or bottom wall 12 of housing 2 at their lower ends in the height direction.

[0077] In addition, the household appliance 1 has a measurement system 13, such as Figure 2 As shown schematically. The measuring system 13 can also be called a load measuring system. The measuring system 13 is used as specified to measure the load of clothes on the washing drum 5.

[0078] like Figure 2 As shown in the simplified diagram, the measurement system 13 has a displacement measuring unit 14. Displacement measurement is achieved through the displacement measuring unit 14. The sinking displacement of the vibration system 3 during loading measurement can be measured. Therefore, the sinking displacement can be determined, and the loading amount and thus the loading weight can be determined accordingly. In addition, the measurement system 13 has another measuring unit 15. Through this additional measuring unit 15 attached to the displacement measuring unit 14, the force exerted by the vibration system 3 on a damper 11 under the same loading measurement can be measured simultaneously. The displacement measuring unit 14 and the additional measuring unit 15 are partially merged here and arranged adjacent to each other. It is specified that the displacement measuring unit 14 and the additional measuring unit 15 are merged here in a local location and arranged on a common component of the household appliance 1. This component is the damper 11 in this embodiment, to which the displacement measuring unit 14 and the additional measuring unit 15 are coupled. This component (the damper 11 in this example) is designed to vary in a defined manner according to the loading when the washing drum 5 is loaded, in particular, it is compressed or expanded along its longitudinal axis A.

[0079] Therefore, the measurement system 13 is configured such that displacement measurement of subsidence and force measurement of force action are spatially and functionally combined on the same component. Force measurement can be performed by an additional measurement unit 15. The additional measurement unit 15 is preferably configured such that the force acting on the component (in this example, along the action chain or measurement chain of the component of the additional measurement unit 15) is converted into a displacement measurement. Thus, the force measurement is converted into a displacement measurement. This means that the force acting on the damper 11 by the vibration system 3 due to load changes is transmitted from the damper 11 to an elastically deformable element, such as a bending beam. Due to the further design scheme explained below according to the embodiment, this initial force measurement is converted into a displacement measurement along the measurement action chain, and the displacement measurement is performed at the end of the measurement chain.

[0080] In one embodiment, displacement measurement unit 14 and another measurement unit 15 are integrated into a total measurement unit coupled to a component (here, damper 11), and through this total measurement unit, the two measurement principles are partially merged.

[0081] This specifically means that at least one component of the two measuring units 14 and 15 is shared by both measuring units. This could be, for example, measuring electronics and / or, for example, a base element on which two separate bending beams are arranged, one bending beam assigned to the displacement measuring unit 14 and the other bending beam assigned to the other measuring unit 15.

[0082] exist Figure 2 The elastic structure 16 is symbolically shown as a component of the displacement measuring unit 14. This elastic structure 16 can be, for example, a bending beam 17. The elastic structure 16 is coupled, in particular, directly to a spring 18. The spring 18 is preferably a helical spring. The spring 18 is a component of the displacement measuring unit 14. The spring 18 is connected at its lower end here to the elastic structure 16 (preferably the bending beam 17). The other end of the spring 18 (here, the upper end) is connected to a component (here, the damper 11). In particular, the upper end of the spring 18 is directly coupled to the upper first damper portion 11a, especially to the support point 11d (i.e., the damper lug of the first damper portion 11a). A mechanical pressure divider 19 is formed by the spring 18 and the elastic structure 16. Furthermore, as... Figure 2 As shown, the additional measuring unit 15 also has an elastic structure 20. This elastic structure 20 may be, for example, a bending beam 21. The elastic structure 20 of this additional measuring unit 15 is directly coupled to the component (here, the damper 11). In one embodiment, the lower end of the damper 11 (here, the lower end of the first damper portion 11a) is positioned directly on the elastic structure 20 (here, the bending beam 21).

[0083] exist Figure 3The diagram illustrates one embodiment of the components and measuring system 13 of a household appliance 1. The measuring system 13 has a base element 22. This base element 22 can be a plate. The base element 22 is preferably made of metal. An elastic structure, in this case, takes the form of at least two curved beams 17 and 21, arranged on the base element 22. These are independent, spaced-apart curved beams 17 and 21. They extend in the same direction. As shown, the base element 22 is integrally formed with, and particularly manufactured as a single piece, the curved beams 17 and 21. The curved beams 17 and 21 extend freely from the same edge of the base element 22. Figure 3 The diagram below shows a top view of the base element 22 and the bending beams 17 and 21. As shown, the bending beam 17 of the displacement measuring unit 14 is configured to be smaller in width than the bending beam 21. The bending beam 21 is preferably at least twice the width of the bending beam 17.

[0084] As shown in the figure, the damper 11 has a base 11c, and an elongated second damper portion 11b is hingedly arranged on the base. Through this base 11c, the damper 11 sits directly on the bending beam 21. Figure 3 As shown in the cross-sectional view, the base element 22 sits directly on the bottom wall 12 from above. In this respect, the curved beams 17 and 21 are arranged spaced upwards, so that they are arranged without contact with the bottom, thus allowing them to move upwards and downwards.

[0085] In addition, Figure 3 As can also be seen, the displacement measuring unit 14 has an amplifying lever. This amplifying lever is a displacement amplifying lever 23. The displacement amplifying lever 23 is directly connected to the bending beam 17. The displacement amplifying lever is integrally manufactured with the bending beam. The displacement amplifying lever 23 is arranged at the front end 17a of the bending beam 17, free from the base element 22. In this embodiment, it is arranged at an angle to the bending beam 17. In particular, it can be oriented here at an angle between 85° and 95° relative to the bending beam 17. Thus, an overall element consisting of the bending beam 17 and the displacement amplifying lever 23 is provided here, which is formed in an L-shape.

[0086] Furthermore, in this embodiment, the additional measuring unit 15 also has an amplifying lever, in the form of a displacement amplifying lever 24. In this embodiment, the displacement amplifying lever 24 is directly connected to the bending beam 21, and is particularly integrally formed and manufactured with it. Also here, the displacement amplifying lever 24 can be directly arranged at the front free end 21a of the bending beam 21. It can be angularly oriented relative to the bending beam 21. In particular, the two displacement amplifying levers 23 and 24 can be arranged adjacently and non-contacting to each other and / or freely cantilevered in the same direction, as... Figure 3As shown in the figure, displacement amplifying levers 23 and 24 are arranged vertically upwards and freely suspended. The bending beam 17 and displacement amplifying lever 23 are arranged in fixed positions relative to each other. This means that movement of the bending beam 17 immediately causes a corresponding movement of the displacement amplifying lever 23. The same applies to the bending beam 21 and displacement amplifying lever 24.

[0087] like Figure 3 As shown in the longitudinal sectional view, two displacement amplifying levers 23 and 24 are horizontally spaced and arranged non-contactly with the measurement electronics 25 of the measurement system 13. The measurement electronics 25 can be mounted on a carrier 26. The measurement electronics 25 may have at least one circuit board 27. As illustrated in the symbolic diagram taken from the left, a computing unit 28, such as a microprocessor, can be arranged on this circuit board. Furthermore, two sensors, in the form of coils 29 and 30, are also provided. Thus, inductive sensing is provided. Sensor 29 is an electromagnetic interaction component. It interacts electromagnetically with the displacement amplifying lever 23, which is at least partially conductive. Conversely, coil 30 (an example of an electromagnetic interaction component) interacts electromagnetically with the displacement amplifying lever 24.

[0088] like Figure 3 As shown in the top view, spring 18 is coupled only to bending beam 17. The base 11c of damper 11 is coupled only to bending beam 21. Depending on the load of clothes on washing drum 5, vibration system 3 sinks, thus damper 11 is compressed. This positional change is detected by two measuring units 14 and 15, and the weight of the clothes is determined accordingly. Based on the corresponding positional changes of displacement amplifying levers 23 and 24 relative to coils 29 and 30, the present load can be determined inductively in this embodiment. With the advantageous displacement amplifying levers 23 and 24, the (potentially relatively small) bending caused by bending beams 17 and / or 21 is converted into a larger positional change of displacement amplifying levers 23 and 24 relative to coils 29 and 30.

[0089] exist Figure 4 The diagram below illustrates another implementation of the 13-part component of the measurement system. Here, the possibility of forming an integrated assembly consisting of a bending beam and a displacement amplification lever is again presented. Figure 3Unlike the angled implementation shown, a completely straight construction of both components can also be specified here. In such a long overall element, when a force K is applied at approximately the effective rotation point D, a portion 31 of the straight, integral overall element 32 will bend. This results in an effective lever length H, which measures the length between the point of force application K and the effective rotation point D. Thus, the portion 33 of the overall element 32 outside the deformation region does not deform. Therefore, in this embodiment, this portion 33 constitutes or forms a displacement amplifying lever. This displacement amplifying lever again interacts electromagnetically with the electromagnetic interaction components, particularly coils 29 or 30. Furthermore, Figure 3 The solution can also be used as Figure 4 The basis for implementation methods.

[0090] exist Figure 5 Another embodiment is shown in the side view. This implementation is based on... Figure 4 The scheme involves forming a one-piece assembly 32 on each of the two measuring units 14 and 15, each assembly 32 having either a curved beam 17 and a displacement amplifying lever 23 linearly connected thereto, or a curved beam 21 and a displacement amplifying lever 24 linearly connected thereto. As shown in the figure, an extension of the assembly is formed outside the deformation region. The solid line through the assembly 32 indicates its resting state or stationary position. The dashed lines shown upward and downward relative to the assembly 32 illustrate exemplary deflection states. Furthermore, a possible location for the measuring electronics 25 is shown here, where it is arranged below the assembly 32 in the height direction. Conversely, in... Figure 5 The diagram on the right illustrates one embodiment where, in another embodiment, the measuring electronics 25 can be arranged in the height direction above the respective main elements 32, serving as both measuring unit 14 and measuring unit 15. A preferred connection to the base element 22 can be provided, for example, on the vertical sidewall 34 of the housing 2, or fixed to a corresponding base projecting upwards from the bottom wall 12. In particular, the elongation of the main element 32, formed as a plate, outside the deformation region results in an increase in the amplitude of motion proportional to the lever length R / r. The left diagram shows a positive system, meaning the signal rises during descent. Figure 5 The right figure shows the negative system, where the signal amplitude decreases as the vibration system 3 sinks.

[0091] exist Figure 3 and 5 The damper lugs are also shown as an example, representing the upper support point 11d of the damper 11, on which the damper 11 is movably and rotatably supported.

[0092] exist Figure 6 In, with Figure 3 ,4 The corresponding figure 5 illustrates another embodiment. In this embodiment, a total element 32 consisting of a bending beam and a displacement amplifying lever is again designed. Here, it is specified that the displacement amplifying lever is guided to the opposite side of the rotation point D, which is the lower side. This results in a reversal of the motion relationship. Here in... Figure 6 The diagram also shows negative and positive systems. Further explanation regarding the solid line representing the total element 32 in its rest position and the dashed line representing its deflection position is provided below. Figure 5 This corresponds to the explanation in [the text]. Similarly, here in [the text]... Figure 6 The diagram also shows two embodiments of the measuring electronic device 25: in one embodiment, it is positioned above the displacement amplification lever 24 in the height direction, and in the other embodiment, it is positioned below the displacement amplification lever 24 in the height direction. As with... Figure 5 As already explained, the displacement measuring unit 14 can also be designed accordingly, thus enabling the corresponding connection and shape design of the overall element 32. The overall element 32 is here formed in a U-shape. In particular, the displacement amplifying lever 24 and the bending beam 21 are therefore parallel to each other.

[0093] exist Figure 7 In the diagram, another embodiment with corresponding components is illustrated. Figure 7 In the embodiments, based on Figure 3 In one embodiment, a displacement amplification lever 24 is not formed entirely as a straight line, but is angled in this respect. Therefore, a first portion 24a and a second portion 24b angled to it are implemented. The second portion 24b interacts specifically with the measuring electronics 25, particularly through electromagnetic interaction. The amplification ratio here is again R / r. However, due to the longer lever R, this ratio... Figure 4 The examples in [the text] are much larger. Figure 7 In this regard, the positive system that has already been explained is shown again.

[0094] exist Figure 8 The text shows the data according to... Figure 7 The embodiment is shown, while the negative system is shown with respect to the measuring electronics 25. The measuring electronics 25 is located here almost above part of the element 24b in the height direction.

[0095] The axial mobility of damper 11 is not decisive for displacement measuring unit 14. Related measurements are possible even without a damper 11 of variable axial length. What is important is the vertical position of the vibration system, which in this example is transmitted to the upper end of the helical spring, while its lower end is fixed to the bending beam. An axially expandable damper 11 arranged parallel to this is exemplary, but not necessary. An important effect of damper 11 is its tilt (the angle of the longitudinal axis relative to the vertical direction); therefore, the sinusoidal component of the angle between damper 11 and the bottom 12, derived from the change in the length of the spring extending parallel to damper 11, reflects the actual height change of the vibration system 3.

[0096] The angle between the longitudinal axis A of the damper 11 and the vertical line can typically be between 10° and 60°, particularly between 20° and 50°. All individual angle values ​​between the boundaries of this range should also be considered disclosed. Therefore, in this respect, all ranges of angle values ​​stepping upwards and downwards in unit values ​​should be considered disclosed.

[0097] List of reference numerals in the attached diagram: 1. Home appliances 2 shells 3 Vibration System 4. Alkali solution container 5 washing drums 6 Support devices 7 Support Spring System 8 support springs 9 top walls 10-damping system 11 dampers 11a First damper section 11b Second Damper Section 11c base 11d damper lug 12 bottom wall 13 Measurement System 14 displacement measurement units 15 Other measuring units 16 elastic structures 17 Bending Beam 17a end 18 springs 19 voltage divider 20 elastic structures 21 Bending Beam 21a end 22 basic components 23 Displacement Amplifying Lever 24 Displacement Amplifying Lever 24a Part 1 24b Part 2 25 Measurement Electronic Equipment 26 carriers 27 circuit boards 28 computing units 29 coils 30 coils 31 areas 32 components Part 33 34 sidewalls A (vertical axis) K-force H lever length Rotation point D R,r is the length of the lever.

Claims

1. A household device (1) for caring for clothing, comprising: Shell (2); and A vibration system (3) comprising a washing drum (5) and an alkali container (4), wherein the vibration system (3) is vibratoryly supported in the housing (2) by a support device (6), wherein the support device (6) has a support spring system (7) with a plurality of support springs (8), through which the vibration system (3) is vibratoryly coupled in the housing (2), and the support device (6) has a damping system (10) with at least one damper (11), through which the vibration system (3) is coupled in the housing (2); as well as A measuring system (13) for measuring the load of clothes on the washing drum (5). The measuring system (13) is characterized by having a displacement measuring unit (14) and an additional measuring unit (15), wherein the displacement measuring unit is capable of measuring the motion displacement of the vibration system (3) during loading measurement, and the additional measuring unit is capable of measuring the force exerted by the vibration system (3) on the damper (11) during loading measurement, wherein the displacement measuring unit (14) and the additional measuring unit (15) are partially arranged on a common component (11) of the household appliance (1), wherein the component (11) changes according to the loading when the washing drum (5) is loaded.

2. The household appliance (1) according to claim 1, characterized in that, The component (11) is configured to vary in length along its longitudinal axis (A) depending on the load.

3. The household appliance (1) according to claim 1 or 2, characterized in that, The component is the damper (11) of the damping system (10).

4. The household appliance (1) according to any one of the preceding claims, characterized in that, The additional measuring unit (15) is configured such that the force acting on the component (11) is converted into a displacement measurement along the action chain of the component of the additional measuring unit (15), thereby converting the force measurement into a displacement measurement.

5. The household appliance (1) according to any one of the preceding claims, characterized in that, The displacement measuring unit (14) and the other measuring unit (15) are integrated into a total measuring unit coupled to the component (11), and the two measuring principles are partially merged through this total measuring unit.

6. The household appliance (1) according to any one of the preceding claims, characterized in that, The displacement measuring unit (14) has a bending beam (17) that bends according to the changes caused by loading of the component (11).

7. The household appliance (1) according to claim 6, characterized in that, The displacement measuring unit (14) has a displacement amplification lever (23) which is coupled to the bending beam (17) and arranged adjacent to the electromagnetic interaction component (29) of the displacement measuring unit (14) so ​​as to interact with the component, in particular, non-contactly, to perform displacement measurement.

8. The household appliance (1) according to claim 7, characterized in that, The coupling configuration is such that changes in the bending displacement of the bending beam (17) result in a greater change in the distance between the displacement amplification lever (23) and the electromagnetic interaction member (29).

9. The household appliance (1) according to claim 7 or 8, characterized in that, The displacement amplifying lever (23) is constructed as a strip, and / or the displacement amplifying lever (23) is integrally formed with the bending beam (17), and / or the displacement amplifying lever (23) is oriented relative to the bending beam (17) at an angle greater than 40° and less than 130°, and extends in a corresponding orientation, particularly freely cantilevered, from the free end of the bending beam (17).

10. The household appliance (1) according to any one of claims 6 to 9, characterized in that, The displacement measuring unit (14) has a spring (18), in particular a helically wound spring, which is coupled, in particular directly, to a bending beam (17) at a first end and coupled, in particular directly, to a component portion (11a) arranged axially along the longitudinal axis (A) of the component (11) at a second end.

11. The household appliance (1) according to any one of the preceding claims, characterized in that, The additional measuring unit (15) has an additional curved beam (21) to which the component (11) is directly coupled, particularly to a second component (11a, 11b) which is axially movable along the longitudinal axis (A) of the component (11) and positioned closer to the curved beam (21) than the first component (11a, 11b), wherein the two component (11a, 11b) are directly connected and can move axially relative to each other.

12. The household appliance (1) according to claim 11 and any one of claims 6 to 10, characterized in that, The bending beam (17) of the displacement measuring unit (14) and the additional bending beam (21) of the other measuring unit (15) are connected to the base element (22) of the measuring system (13), and are in particular integrally formed with the base element.

13. The household appliance (1) according to claim 12, characterized in that, The base element (22) is arranged on, in particular fixed to, the bottom (12) of the housing (2) of the household appliance (1) or on the base (34) and / or sidewall (34) arranged on the bottom (12), and / or two curved beams (17, 21) are spaced apart and extend from the base element (22) in the same direction.

14. The household appliance (1) according to any one of claims 11 to 13, characterized in that, The additional measuring unit (15) has an additional displacement amplification lever (24) coupled to the additional bending beam (21) and arranged adjacent to the additional electromagnetic interaction member (30) of the additional measuring unit (15) so as to perform an interaction with the additional electromagnetic interaction member, in particular, non-contactly, to convert force measurement into displacement measurement.

15. The household appliance (1) according to claim 7 and / or claim 14, characterized in that, The displacement amplification lever (23,24) is constructed in a straight line, or in a non-straight line and the parts of the displacement amplification lever (23,24) have obtuse angles, or in a non-straight line and the parts of the displacement amplification lever (23,24) have acute angles.

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