CH710591B1 - Washing machine with imbalance compensation and progressive storage. - Google Patents

Abstract

To compensate for an imbalance in the loading of a washing machine, at least six water tanks (10) are provided on the drum (2) of the washing machine. Next, the tub (4) of the device is resiliently mounted. The storage (5) of the tub (4) has a lower rigidity when the tub (4) is not loaded than when the tub (4) is fully loaded. As bearing elements (22) for the bearing (5) are components with a rubber-elastic connecting element (25) in combination with a resilient element (28) is used, which have progressive stiffness.

Description

description

Field of the Invention The invention relates to a washing machine having a drum rotatable about an axis of rotation and having water tanks disposed on the drum for compensating an imbalance of the drum according to the preamble of claim 1.

The invention further relates to a washing machine with at least six water tanks for unbalance compensation and a device tower or a cabinet comprising a washing machine.

Background EP 1 736 589 describes a washing machine of this type. It has a drum rotatably disposed in a tub. Three water tanks are arranged on the drum to compensate for imbalance of the drum, such as may be generated from uneven loading thereof. By properly charging the tanks with water, vibrations such as those occurring when centrifuging the laundry can be reduced.

For storage of the tub spring bearings are provided with Dämpforganen.

DESCRIPTION OF THE INVENTION It is the object of the invention to improve the storage of the tub in such a device.

This object is achieved by the washing machine according to claim 1.

Accordingly, the washing machine has in a conventional manner a tub for receiving process water and a rotatable about an axis of rotation arranged in the tub drum. On the drum, water tanks are arranged to compensate for the imbalance of the drum, as e.g. may result from uneven loading of the drum. Next, a damped, resilient mounting is provided for the tub.

The device has a controller which is adapted to supply the tub a maximum amount of process water to wash the laundry, and which is further adapted to balance the drum for centrifuging the laundry by targeted, partial filling of the water tank.

If the tub is not loaded, i. if it contains neither laundry nor process water, it is in a first position P1. If, in contrast, the tub is loaded with laundry at the maximum weight and, in addition, charged with the maximum amount of process water, it is lowered due to its weight to a second position P2.

According to the claim, the storage in the vertical direction in the first position P1 of the tub now has a lower absolute stiffness than in the second position P2. The term absolute stiffness (often referred to as "spring constant") describes the required vertical force change AF for an infinitesimal vertical displacement Az, respectively starting from the first and second position, i. the absolute stiffness S is given by AF = S · Az.

The invention is based on the finding that the maximum possible deflections of the tub can be kept very small when on the one hand provided the drum with an imbalance compensation means of water tanks and on the other hand, a storage with progressive stiffness in the above sense is used.

Thanks to the unbalance compensation, the deflections of the tub and the drum during centrifugation can be kept small. However, the problem remains that the tub in a conventional, linear resilient storage due to the weight of the process water in the washing process would lower relatively high, which would require a large mechanical clearance between the tub and the housing. This lowering is counteracted by the increasing rigidity, so that the deflection of drum and tub remains low during the washing process.

The combination of these measures allowed to keep the game between the housing and tub small. For a given unit size tub and drum can be made larger, which increases the usable space. In addition, the storage of the tub can be realized easily.

Advantageously, the stiffness in the vertical direction in the second position P2 is at least 50%, in particular at least 100%, greater than in the first position P1.

Further, the storage is advantageously dimensioned so that the tub at the transition between the first and the second position P1, P2 by at most 1 cm, in particular by at most 0.5 cm lowers. This is possible by properly selecting the increase in stiffness between the first and second positions.

Advantageously, the storage also in the horizontal direction perpendicular to the axis of rotation in the first position P1 has a lower absolute stiffness than in the second position P2, whereby horizontal deflections during washing of the laundry can be further reduced. Advantageously, the stiffness is also at least 50%, in particular at least 100%, greater in the second position P2 in the horizontal direction than in the first position P1.

In a further advantageous embodiment, the bearing has at least one bearing element comprising a first and a second bearing and a disposed between the first and the second bearing elastic connecting element. In this case, the first bearing may be stationary and the second bearing may be arranged on the tub, or vice versa (i.e., the first bearing is arranged on the tub while the second bearing is stationary). The connecting element and the second bearing are in contact via a contact surface. In order to achieve a higher rigidity of the bearing in the second position P2 of the drum, the contact area in the first position P1 is smaller than in the second position P2.

Advantageously, the contact surface in the second position at least 50%, in particular at least 100%, greater than in the first position P1.

The present invention is particularly suitable for devices in which the axis of rotation of the drum is horizontal or at a small angle (e.g., less than 10 °) from the horizontal. However, it is also conceivable use in devices with a vertical or oblique axis of rotation.

Thanks to the use of six or more water tanks, a very quiet drum run is achieved. A further advantageous embodiment relates to a washing machine having a tub for receiving process water, a drum arranged around a rotation axis rotatable in the tub for receiving laundry up to a maximum permissible weight, at least six arranged on the drum water tanks to compensate for an imbalance of the drum and a damped , resilient storage for the tub.

Advantageously, the washing machine in all aspects of the invention has at least six water tanks. These are divided into at least a first and a second group. The centers of gravity of the water tanks of the first group are closer to the first end of the drum than to the second, while the centers of gravity of the water tanks of the second group are located closer to the second end of the drum than the first. By such a distribution of the water tanks in the axial direction of the drum, the compensation of imbalance can be improved, since in addition an uneven distribution of the laundry along the axis of rotation can be compensated. In particular, thanks to the claimed arrangement, tumbling of the drum can also be compensated.

In particular, the smooth running of the device allows the use of a very small door bellows and the inside of the door can be kept very flat.

The washing machine with six water tanks is particularly suitable for arrangement in tower construction on a tumble dryer. Accordingly, the invention also relates to a device tower comprising a tumble dryer and a washing machine, wherein the washing machine rests on the tumble dryer.

Next, this washing machine is also particularly suitable for placement in a cabinet, the washing machine can be mounted thanks to their very quiet running not only in the bottom of the cabinet, but also above a cabinet compartment.

BRIEF DESCRIPTION OF THE DRAWINGS Further embodiments, advantages and applications of the invention will become apparent from the dependent claims and from the following description with reference to the figures. Showing:

1 is a schematic front view (without door) of a first embodiment of a washing machine,

FIG. 2 shows a section along the axis of rotation through the washing machine according to FIG. 1, FIG.

3 is a schematic view of the drum and the water tanks of the washing machine,

4 shows a simplified section along the axis of rotation with the tub in the first and (dashed) in the second position,

5 shows a section through a bearing element,

6 shows the relation between deflection and force during storage of the tub,

Fig. 7 shows the arrangement of a tumble dryer and a washing machine in tower construction and Fig. 8 shows the arrangement of a tumble dryer over a cabinet compartment.

Means for Carrying out the Invention The washing machine according to FIGS. 1 to 3 has a stationary housing 1, in which a drum 2 for receiving laundry is arranged. In the illustrated embodiment, the drum 2 is rotatably mounted in a tub 4 about a substantially horizontal axis of rotation 3. The tub 4 is mounted on or on a bearing 5 deflectable in the housing 1. The bearing 5 is elastic and has means for damping the deflections of the tub 4.

On the tub 4, a motor 6 is further mounted, which drives the drum 2 via a drive belt 7 for rotation.

[0029] Forward, i. towards the user side, the drum 2 and the tub 4 can be locked by a door 8. The device is equipped with a controller 9 which controls the various components.

The device is designed to wash laundry in a conventional manner. For this purpose, 9 different washing programs are stored in the controller. In at least part of these washing programs, a centrifuging phase is provided, in which the drum 2 is rotated at high speed. This speed is at least about 600 revolutions per minute, typically around 1000 or more revolutions per minute.

When centrifuging, as well as when starting up the drum rotation for centrifuging, it is important that the drum 2 is well balanced. In particular, if the laundry is distributed unevenly in the drum, it may come without additional measures to strong vibrations, which must be absorbed by the supports and / or suspensions.

Therefore, in operation, the imbalance of the drum is measured (eg in a conventional manner by means of acceleration sensors on the tub 4), and there are water tanks 10 provided on the drum, which is supplied depending on the unbalance individual water, so a more uniform To achieve drum run.

In the embodiment of Figures 1-3, a total of six water tanks 10a-10f are provided which, in the embodiment shown, are equidistant over the circumference of the drum 2, i. evenly distributed, so that in six water tanks, the angular distance α between adjacent water tanks is 60 ° (see Fig. 3).

Since not only deflections but also tumbling movements of the drum 2 are to be compensated with the water tanks 10, part of the water tanks at the front, first end 2a of the drum 2 and another part of the water tanks at the rear, second end 2b must be arranged , Therefore, the water tanks are divided into at least two groups. The water tanks of the first group, which in the present example includes the water tanks 10a, 10c and 10e, are arranged so that the center of gravity of each of these water tanks (when filled) is closer to the first end 2a than to the second end 2b of the drum 2. On the other hand, the water tanks of the second group, in the present example, the water tanks 10b, 10d and 10f are arranged so that the center of gravity of each water tank (when filled) is closer to the second end 2b than the first end 2a of the drum 2.

The water tanks 10 of the first and second groups are alternately distributed over the circumference of the drum 2, i. adjacent to each water tank of the first group are two water tanks of the second group, and vice versa.

For supplying water to the water tanks 10a-10f, for example, at the rear, second end 2b of the drum 2 in a conventional manner, a filling device is provided which comprises an arrangement of filling rings 11 on the drum rear side and an injection assembly 12. Via the injection arrangement 12, water can be injected into the filling rings 11 when the drum 2 is rotating. In the present embodiment, six packing rings 11 are provided, each of which is associated with one of the water tanks 10. The injection assembly 12 has correspondingly six nozzles 14, which can supply the filling rings 11 specifically with water.

On the inside of the jacket 15 of the drum 2, a total of six ribs 16 are arranged in the present embodiment, which serve as a driver for the laundry. In each of these ribs 16, exactly one of the tanks 10 is accommodated in the present example.

Each rib 16 extends between the first end 2a and the second end 2b of the drum 2. Those ribs 16 which receive a water tank 10a, 10c, 10e of the first group, taper towards the second end 2b, while the other ribs, which receive a water tank 10b, 10d, 10f of the second group, taper towards the first end 2a.

For those ribs 16 which receive a water tank 10a, 10c, 10e of the first group, the tapered portion facing the second end 2b of the drum 2 forms a connecting pipe 17 (see Fig. 2) for the water tank the filling device 11, 12 to connect. Furthermore, the water tanks 10a, 10c, 10e of the first group each have at least one vent opening 18 (see FIG. 3) at the first end 2a of the drum 2, which simplifies the filling and emptying of the water tanks. In the case of the water tanks 10b, 10d, 10f of the second group, a vent opening is likewise provided, which, however, is arranged on the second end 2b of the drum 2.

As can be seen from Figures 1-3, in the illustrated embodiment, all the ribs 16 and the water tanks 10a-10f are identical to each other, but aligned alternately forward and backward.

The controller 9 is configured to supply process water to the tub 4 for washing laundry. The amount of process water may depend on the wash program selected. In at least one washing program, the tub 4 is supplied with a maximum amount of process water at the same time for which the device is designed. Added to the weight of the process water is still the weight of the laundry, which is limited upwards by the maximum permissible weight of the laundry. Compared to a tub without laundry and process water, the weight increase of the tub at maximum laundry load and process water loading thus corresponds to the maximum weight of the laundry plus the weight of the maximum amount of process water. For example, if the maximum weight of the laundry is 80 N and the maximum process water amount is 25 liters, the increase in the weight force is more than 330 N.

Typically, the maximum permissible weight of the laundry in a household washing machine is between 50 and 120 N.

Since the bearing 5 is a resilient bearing, the additional weight load causes the tub 4 without loading (ie without laundry and process water) is in a first position P1, which is shown in Fig. 4 in solid lines, whereas, on the other hand, at maximum loading with laundry and process water, it lowers to a second, lower position P2, which is shown by dashed lines in FIG.

In order to ensure a tight transition between the tub 4 and the frame of the door 8 in both positions, a flexible door bellows 20 is disposed between the tub 4 and the frame of the door 8.

As mentioned above, the absolute rigidity of the bearing 5 depends on whether the tub 4 is in the first position P1 or the second position P2. In particular, the absolute stiffness against vertical deflections of the tub 4 in the first position P1 is lower than in the second position P2.

To achieve this, various types of bearings may be provided which have a progressive absolute stiffness.

In the embodiment according to FIGS. 1-4, four bearing elements 22 are provided by way of example, which support the tub 4 from below. Each bearing element 22 has a first bearing 23, a second bearing 24 and an elastic connecting element 25, which is arranged between the bearings 23, 24 (see Fig. 1). The term "elastic" is to be understood relative to this, ie. in that the elasticity of the connecting element 25 is significantly higher than that of the bearings 23, 24, i. The rigidity of each bearing 23, 24 is at least ten times greater than that of the connecting element 25.

In the embodiment of Figures 1-4, the first bearing 23 is stationary (i.e., fixed relative to the housing 1) and is e.g. formed by a base which rests on the bottom of the housing 1. In contrast, the second bearing 24 is fixed to the movable tub 4 and is e.g. formed by the lateral surface of the tub 4.

FIG. 5 shows a detail section of an embodiment of the bearing element 22, specifically in the first position P1 of the tub 4.

As can be seen, the connecting element 25 is in contact with both bearings 23, 24. It is advantageously made of a rubber-elastic material, so it is relatively soft and has a relatively high intrinsic damping. Thanks to the use of such a material can be dispensed with a further damping member in addition to the connecting element 25.

The connecting element 25 has a core 26 and a radially surrounding the core, the beabstan-det denominated jacket 27. Between the core 26 and the shell 27 so a gap 28 is formed.

In the first position P1 of the tub 4 shown in Fig. 5, the core 26 is in contact with the second bearing 24, but not the shell 27. The contact surface between the elastic connecting element 25 and the second bearing 24 thus corresponds to the cross section of the core 26.

In this position P1, the distance D between jacket 25 and second bearing 24 is preferably between 2 and 10 mm, in particular between 3 and 5 mm.

If now the tub 4 moves to the second position P2, it descends along the vertical direction z. This reduces the distance D under elastic deformation of the core 26 until the second bearing 24 touches on the jacket 27, whereby the contact area between the connecting element 25 and the second bearing 24 increases abruptly. This increases the rigidity of the storage.

As is further apparent from FIG. 5, a spring-elastic element 29, preferably a spring, is arranged between the core 26 and the jacket 27. This element 29 is in the first and in the second position P1 or P2 of the tub 4 with two bearings 23, 24 in contact and is compressed when lowering the tub 4 from the first to the second position. The element 29 has as a resilient element less damping than the rubber-elastic connecting element 25. It acts as a return member, since the rubber-elastic core has a certain compression set.

The core 26 is rod-shaped and extends between a first end 25 a and a second end 25 b of the connecting element 25.

At the first end 25a, the connecting element 25 is held against tangential deflections and deflections parallel to the axis of rotation 3 on the first bearing 23. By "tangential deflections" are meant deflections in the direction y 'tangential to the nearest region of the lateral surface of the drum 2. At the second end 25 b, the connecting element 25 is held against tangential deflections and deflections parallel to the axis of rotation 3 on the second bearing 24. Thus, shear forces act on the connecting element 25 when the tub 4 moves axially or tangentially. The rubber-elastic connecting element 25 can counteract such forces only with relatively little force.

However, if the tangential or axial deflections are large, the core 26 abuts against the jacket 27. This jacket 27 is arranged in a sleeve 30 of the first bearing 23. The collar 30, like the skirt 27, is substantially radially aligned with the axis of rotation 3 (ie, parallel to the direction z shown in FIG. 5) and holds the connector 25 laterally (ie in the directions perpendicular to the direction z) ,

Since the sleeve 30, as the whole of the first bearing 23, is made of a stiffer material than the connecting element 25, the sleeve generates in strong axial or tangential movements of the tub 4, when the core 26 is deflected so far that it against strikes the outside, an additional restoring force, so that even in these directions, the storage for strong deflections is stiffer.

A particularly strong restoring force and high stability can be achieved if a pin 31 is arranged on the second bearing 24, which extends into the sleeve 30 inside. In the illustrated embodiment, this pin 31 is connected to the connecting element 25. Namely, it encloses the core 26 in the region of the second end 25 b of the connecting element 26.

Fig. 6 shows the location-force diagram of the bearing 5 of the present device for horizontal deflections y and vertical displacements z of the tub 4 with respect to the housing 1. As can be seen, the curves are highly non-linear. When the tub 4 is at the first position P1, the curves are relatively flat and the corresponding absolute stiffnesses Sy (P1) and Sz (P1) corresponding to the slopes of the curves at the y and z values for P1, respectively relatively low. When the tub 4 is at the second position P2, the curves are relatively steep and the corresponding absolute stiffnesses Sy (P2) and Sz (P2) are higher.

The dimensioning of the storage and thus the exact course of the curves in Fig. 6 depends on various factors, in particular the weight of the drum and tub, the maximum allowable weight of the laundry and the maximum process water quantity provided, and further from the maximum allowable Deflection of the tub 4.

In particular, the stiffness and damping at the position P1 is advantageously to be selected so that the maximum permissible deflection of the tub 4 is not exceeded during centrifugation of the laundry with simultaneous compensation of imbalance by filling the water tank 10. On the other hand, the rigidity at the position P2 is to be chosen such that the tub 4 does not sink too low even under maximum load and the horizontal and vertical vibrations of the tub 4 generated by the normal washing process also remain in the permitted range.

The measures described here, in particular the use of at least six water tanks for unbalance compensation, make it possible to provide a washing machine with a very quiet, low-vibration run. This results in various advantages.

In particular, the smooth running of the apparatus allows the use of a very small elastic door bellows 20 (see Fig. 4) between the door frame and the mouth of the tub 4, in particular a door bellows extending in the direction of the rotation axis 3 less than 3 cm, in particular over less than 1 cm, extending.

Next, the risk that clothes caught between the drum 2, 4 and the frame of the door 8, very small. Therefore, can be dispensed with the normally provided in washing machine doors strong indentation in the interior of the drum. In particular, in a preferred embodiment, a door 8 may be used, the inside of which does not extend into the tub 2.

Furthermore, the invention also relates to a device tower comprising a washing machine 41, wherein the washing machine 41 rests on the tumble dryer 40, as shown in Fig. 7. This is made possible by the quiet running of the device.

Such an arrangement is particularly advantageous because it offers a higher degree of ergonomics by the heavy, wet laundry between the devices not from bottom to top, but only has to be transported from top to bottom.

8 shows a further embodiment of a cabinet 43 with a washing machine 41. As can be seen, here the washing machine 41 is not arranged on the floor, but above the cabinet compartment 42. This is also possible by the quiet device running.

Remarks: In the embodiment described above, the bearing elements 22 are loaded under pressure. It is also conceivable to load at least part or all of the bearing elements to tension, i. hang the tub 4 at least partially.

The embodiment according to FIG. 5 shows only one of the possible realizations of a bearing element. For example, parts of the shell 27 of the elastic connecting element 25 in the first position P1 of the tub 4 already in contact with the second bearing 24, while other parts of the shell 27 or core 26 until the transition of the tub 4 in the second position P2 with the second bearing 24 come into contact.

While preferred embodiments of the invention have been described in the present specification, it is to be understood that the invention is not limited thereto and may be embodied otherwise within the scope of the following claims.

Washing machine for washing laundry, comprising a tub (4) for receiving process water, a drum (2) arranged around a rotation axis (3) rotatably in the tub (4) for receiving laundry up to a maximum permissible weight Drum (2) arranged water tanks (10) for compensating an imbalance of the drum (2), a damped, resilient mounting (5) for the tub (4) and a controller (9) which is adapted to the tub (4) supplying a maximum amount of process water to wash the laundry and which is further configured to balance the drum (2) for centrifuging the laundry via the water tanks (10), the tub (4) being loaded in a first position (P1) without loading is located at loading with laundry at the maximum weight and the maximum amount of process water in a second, lower position (P2), characterized in that the bearing (5) in the vertical direction in the first position (P1 ) has a lower absolute stiffness than in the second position (P2). 2. Washing machine according to claim 1, wherein the stiffness in the vertical direction in the second position (P2) by at least 50%, in particular by at least 100%, greater than in the first position (P1). 3. Washing machine according to one of the preceding claims, wherein the bearing (5) is designed so that the tub (4) between the first and the second position (P1, P2) by a maximum of 1 cm, in particular by at most 0.5 cm , lowers. 4. Washing machine according to one of the preceding claims, wherein the bearing (5) also in the horizontal direction perpendicular to the axis of rotation in the first position (P1) has a lower absolute stiffness than in the second position (P2), and in particular wherein the absolute stiffness in the second position (P1) by at least 50%, in particular by at least 100%, greater than in the first position (P1). 5. Washing machine according to one of the preceding claims, wherein the bearing (5) at least one bearing element, (22) comprising a first and a second bearing (23, 24), and between the first and the second bearing (23, 24) arranged elastic connecting element (25), wherein the first bearing (23) stationary and the second bearing (24) on the tub (4) is arranged, or vice versa, and wherein the connecting element (25) and the second bearing (24) via a contact surface in contact with each other, and wherein the contact area in the first position (P1) is smaller than in the second position (P2). 6. Washing machine according to claim 5, wherein the connecting element (25) is rubber-elastic. 7. Washing machine according to one of claims 5 or 6, wherein the connecting element (25) has a core (26) and a core (26) radially surrounding, from the core (26) spaced jacket (27), and wherein in the first position (P1) the core (26) with the second bearing (24) is in contact, but not the jacket (27), and wherein in the second position (P2) and the jacket (27) with the second bearing (24) in Contact stands. 8. Washing machine according to one of claims 5 to 7, wherein in addition to the connecting element (25) a resilient element (29) between the bearings (23, 24) is arranged, in particular a spring, which in the first and the second position (P1, P2) is in force contact with both bearings (23, 24). 9. Washing machine according to claims 7 and 8, wherein the resilient element (28) between the jacket (27) and the core (26) is arranged. 10. Washing machine according to one of claims 5 to 9, wherein the connecting element (25) at a first end (25a) against tangential deflections and deflections parallel to the axis of rotation on the first bearing (23) and at a second end (25b) against tangential deflections and Deflections is held parallel to the axis of rotation on the second bearing (24). 11. Washing machine according to one of claims 5 to 10, wherein on the first bearing (23) a collar (30) is arranged, which is aligned radially to the axis of rotation (3) and the connecting element (25) holds laterally. 12. Washing machine according to claim 11, wherein on the second bearing (24) a pin (31) is arranged, which extends into the sleeve (30) inside. 13. Washing machine according to one of the preceding claims, wherein the axis of rotation (3) of the drum (2) extends horizontally or at an angle of at most 10 ° to the horizontal. 14. Washing machine according to one of the preceding claims, with at least six on the drum (2) arranged water tanks (10). 15. Washing machine according to one of the preceding claims, wherein each water tank (10) in a filled state has a center of gravity, wherein the drum (2) extends along the axis of rotation (3) between a first and a second end (2a, 2b) and wherein the washing machine comprises a total of at least six water tanks (10) divided into at least two groups, the centers of gravity of the water tanks (10) of the first group being closer to the first end (2a) than to the second end (2b) of the drum (2 ) and the centers of gravity of the water tanks (10) of the second group are closer to the second end (2b) than to the first end (2a) of the drum (2). 16. Washing machine according to one of the preceding claims, with a door (8) through which the drum (2) is accessible, wherein an inside of the door (8) does not extend into an interior of the drum (2). 17. Washing machine according to one of the preceding claims, with a door (8) through which the drum (2) is accessible, wherein between a frame of the door (8) and an orifice of the tub (2) a flexible door bellows (20) is that extends in the direction of the axis of rotation 3 over less than 3 cm, in particular over less than 1 cm. An apparatus tower comprising a washing machine (41) according to any one of the preceding claims, and a clothes dryer (40), the washing machine resting on the clothes dryer (40).

Claims (18)

claims 1. washing machine for washing laundry, with a tub (4) r receiving process water, a about an axis of rotation (3) rotatably in the tub (4) arranged drum (2) for receiving laundry up to a maximum permissible weight, on the drum (2) arranged water tanks (10) for compensating an imbalance of the drum (2), a damped, resilient mounting (5) for the tub (4) and a controller (9) which is adapted to the tub (4) a supplying maximum amount of process water to wash the laundry and which is further configured to balance the drum (2) for centrifuging the laundry over the water tanks (10), the tub (4) being in a first position (P1) without loading and when loaded with laundry at the maximum weight and the maximum amount of process water in a second, lower position (P2), characterized in that the bearing (5) in the vertical direction in the first position (P1) has a lower a having very stiffness than in the second position (P2). 2. Washing machine according to claim 1, wherein the stiffness in the vertical direction in the second position (P2) by at least 50%, in particular by at least 100%, greater than in the first position (P1). 3. Washing machine according to one of the preceding claims, wherein the bearing (5) is designed so that the tub (4) between the first and the second position (P1, P2) by a maximum of 1 cm, in particular by at most 0.5 cm , lowers. 4. Washing machine according to one of the preceding claims, wherein the bearing (5) also in the horizontal direction perpendicular to the axis of rotation in the first position (P1) has a lower absolute stiffness than in the second position (P2), and in particular wherein the absolute stiffness in the second position (P1) by at least 50%, in particular by at least 100%, greater than in the first position (P1). 5. Washing machine according to one of the preceding claims, wherein the bearing (5) at least one bearing element, (22) comprising a first and a second bearing (23, 24), and between the first and the second bearing (23, 24) arranged elastic connecting element (25), wherein the first bearing (23) stationary and the second bearing (24) on the tub (4) is arranged, or vice versa, and wherein the connecting element (25) and the second bearing (24) via a contact surface in contact with each other, and wherein the contact area in the first position (P1) is smaller than in the second position (P2). 6. Washing machine according to claim 5, wherein the connecting element (25) is rubber-elastic. 7. Washing machine according to one of claims 5 or 6, wherein the connecting element (25) has a core (26) and a core (26) radially surrounding, from the core (26) spaced jacket (27), and wherein in the first position (P1) the core (26) with the second bearing (24) is in contact, but not the jacket (27), and wherein in the second position (P2) and the jacket (27) with the second bearing (24) in Contact stands. 8. Washing machine according to one of claims 5 to 7, wherein in addition to the connecting element (25) a resilient element (29) between the bearings (23, 24) is arranged, in particular a spring, which in the first and the second position (P1, P2) is in force contact with both bearings (23, 24). 9. Washing machine according to claims 7 and 8, wherein the resilient element (28) between the jacket (27) and the core (26) is arranged. 10. Washing machine according to one of claims 5 to 9, wherein the connecting element (25) at a first end (25a) against tangential deflections and deflections parallel to the axis of rotation on the first bearing (23) and at a second end (25b) against tangential deflections and Deflections is held parallel to the axis of rotation on the second bearing (24). 11. Washing machine according to one of claims 5 to 10, wherein on the first bearing (23) a collar (30) is arranged, which is aligned radially to the axis of rotation (3) and the connecting element (25) holds laterally. 12. Washing machine according to claim 11, wherein on the second bearing (24) a pin (31) is arranged, which extends into the sleeve (30) inside. 13. Washing machine according to one of the preceding claims, wherein the axis of rotation (3) of the drum (2) extends horizontally or at an angle of at most 10 ° to the horizontal. 14. Washing machine according to one of the preceding claims, with at least six on the drum (2) arranged water tanks (10). 15. Washing machine according to one of the preceding claims, wherein each water tank (10) in a filled state has a center of gravity, wherein the drum (2) extends along the axis of rotation (3) between a first and a second end (2a, 2b) and wherein the washing machine comprises a total of at least six water tanks (10) divided into at least two groups, the centers of gravity of the water tanks (10) of the first group being closer to the first end (2a) than to the second end (2b) of the drum (2 ) and the centers of gravity of the water tanks (10) of the second group are closer to the second end (2b) than to the first end (2a) of the drum (2). 16. Washing machine according to one of the preceding claims, with a door (8) through which the drum (2) is accessible, wherein an inside of the door (8) does not extend into an interior of the drum (2). 17. Washing machine according to one of the preceding claims, with a door (8) through which the drum (2) is accessible, wherein between a frame of the door (8) and an orifice of the tub (2) a flexible door bellows (20) is that extends in the direction of the axis of rotation 3 over less than 3 cm, in particular over less than 1 cm. An apparatus tower comprising a washing machine (41) according to any one of the preceding claims, and a clothes dryer (40), the washing machine resting on the clothes dryer (40).