• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    SUMMARY The invention relates to a cylinder (1) for a washing machine which comprises a jacket surface (2) and at least one roller (5). The side surface (7) of the cable (5) at its distal end (9) is concave, convex or wedge-shaped so that laundry is guided from the zone of the cylinder (drainage zone) in the axial direction when rotating the cylinder (1) towards the zone of the cylinder (centrifugation zone) in axial joint intended for centrifugation of the laundry. Figure for publication: 3
    公开号:SE1150028A1
    申请号:SE1150028
    申请日:2010-02-12
    公开日:2011-08-13
    发明作者:Mats Lilja；Anders Sahlen；Tobias Straalman；Patrik Jansson；Christine Johansson
    申请人:Asko Appliances Ab；
    IPC主号:
    专利说明:

    Drainage of water and particles and a good mixture of detergent in the water. When spinning, however, there is a conflicting desire regarding the size of the drainage holes, ie. that they should be relatively small, in order to achieve a centrifugation which is as gentle as possible. The invention relates to a washing drum which is intended to solve this problem, i.e. a washing drum that both provides efficient drainage and provides gentle centrifugation.
    DISCLOSURE OF THE INVENTION The invention thus relates to a cylinder, or as it is usually also called a washing drum, for a washing machine. The cylinder comprises a mantle surface provided with drainage holes and at least one cap. Normally there are at least two rollers in the washing drum, usually two to four wash rollers, placed on the mantle surface of the inside of the drum. These are preferably placed rotationally symmetrically so that the cylinder is subjected to as little tilting forces as possible during rotation. A common construction is that the roller runs parallel to the center axis of the cylinder, ie. along the generators of the cylinder, along substantially the entire extent of the cylinder in the axial direction. The selection can also be shorter and / or be slightly angled with regard to the center axis of the cylinder. The whales' appearance can vary greatly. The simplest type of roller consists of a plate that protrudes from the inside of the cylinder. Usually, however, the whales have more sophisticated shapes and may, for example, be substantially V-shaped (seen in a radial cross-section of the cylinder) with two equilateral walls attached to the outer surface of the cylinder which form the wide base and merge into a top which is usually slightly rounded to avoid an overly sharp edge tearing too hard on the laundry.
    It is also possible to design the roller with different sides so that one side is relatively slowly sloping and gives a relatively smooth transition between the cylinder surface of the cylinder and the roller while the other side of the roller has a more vertical angle to the jacket surface. The roller may also be U-shaped with substantially perpendicular walls at its base at the circumferential surface of the cylinder and a softly rounded top or be of a shape which is a combination of U-shape and the previously described variants of V-shape. The shape of the whale can also resemble a sine curve or be of a type that has a more or less straight block-like character with walls attached to the mantle surface and in between a more clearly defined "roof" which forms the top of the whale at its distal end from the cylinder mantle surface. The shape of the roller may also vary along its extent in the axial direction along the cylinder and such variations will be described in more detail later. The roller can thus be designed in a number of different ways to fulfill its function as a mixer of laundry.
    According to an embodiment of the invention, at least one of the rollers is provided with at least one evacuation hole. The purpose of such an evacuation hole is that coarser dirt particles, for example gravel or smaller stones, which normally cannot pass through the drainage holes of the washing cylinder should be able to pass through the evacuation holes and thus be evacuated from the cylinder during washing.
    The evacuation hole, or evacuation holes, are normally located in the roller near its base at the mantle surface of the cylinder so that the unwanted particles that have entered the cylinder can be easily led into the evacuation holes during washing. In normal cases, the particles released from the laundry will accumulate in the lower part of the cylinder and abut against the outer surface of the cylinder. Upon rotation of the cylinder, the particles which abut the surface of the cylinder but are too large to pass through the usual drainage holes in the outer surface of the cylinder will be transported towards the wall where they can then disappear from the cylinder through the evacuation holes in the wall.
    By drainage holes is meant the holes which are formed in the outer surface of the cylinder which are open and which are intended to be in contact with the laundry during washing. Drainage holes thus do not mean holes that are hidden under or behind the wall and are thus protected from direct contact with the laundry.
    The indication that the evacuation holes are close to the surface of the cylinder means that the holes are located at least 2 cm from the cylinder surface and even more preferably less than 1 cm from the cylinder surface. A normally advantageous location of the evacuation hole is that it adjoins the mantle surface.
    To offer a good evacuation of particles, the area of the evacuation hole should be at least twice the average area of the drainage holes in the cylinder surface and the size of the evacuation holes is often up to 3 times as large or even 4 times as the average area of the drainage holes in the jacket surface. The drainage holes in the mantle surface can vary in size and shape, but normally consist of round heels with a diameter between 2 and 4 mm in size.
    In order for the evacuation holes to fulfill a good function, they should be larger than the largest drainage holes in the outer surface of the cylinder and the evacuation holes are normally at least twice as large as the largest holes and in many cases at least 3 times as large.
    In addition to the size of the evacuation holes, the shape of the holes can also play a major role. While the usual drainage holes in the washing cylinder are usually round, the shape of the evacuation holes can vary from the shape of elongated straight blocks to rectangular or round, semicircular or oval. In order to obtain a good evacuation of different types of particles, it can be an advantage to provide the whales with evacuation holes of different sizes and different shapes.
    The evacuation holes should be at least 20 square millimeters in size and in many cases it is even larger and the evacuation holes can be at least 30 square millimeters or even over 40 square millimeters. Regarding its upper size, it must be so small that the risk of some laundry being able to get stuck in the evacuation hole is minimized. In addition to the size of the hole, the design of its opening is also important for the risk of a laundry being stuck in the hole. For machines intended for home use with a large variety of laundry in the form of various garments and the like, the shape and size of the hole should be adjusted so that, for example, buttons or other parts of a garment can not get stuck in the evacuation hole so that the clothes are mechanically torn by they get stuck in the hole. For these machines, the size of the evacuation hole is normally not intended to be larger than 1 square centimeter to avoid damage to the laundry. The size of the evacuation holes is normally between 20 and 100 square millimeters in size, although deviations may occur.
    As described earlier, the wall can vary in its design and by adapting the wall depending on the location of the evacuation holes, evacuation of particles through them can be improved. An evacuation can often be improved by allowing the angle between the side surface of the whale in which the evacuation hole is located and the mantle surface of the cylinder to be less than 135 degrees, preferably less than 120 degrees and most preferably less than 105 degrees. By leaving the evacuation hole located in a wall or side surface of the wall which is relatively upright, the particles present in the washing drum will follow the wall a longer distance than if the side surface of the wall is relatively flat along the cylinder surface.
    To further improve the evacuation of particles through the evacuation hole or evacuation holes in the cylinder, the cylinder at its base where it abuts the outer surface of the cylinder may be shaped so that particles are guided in the axial direction towards the evacuation hole upon rotation of the cylinder. The base could, for example, be outwardly wedge-shaped or convexly bent in the middle part of the roll in its longitudinal extent (ie the roll at its middle part is provided with a bulge or wedge in the direction of rotation of the drum), which normally coincides with the axial direction of the cylinder. against the base of the wall at the mantle surface of the cylinder is guided at each end of the wall towards evacuation holes located relatively close to the ends. It is of course also possible to design the wall at its base so that it is wider at the ends of the wall in the longitudinal direction than at its center so that particles are led towards the center where one or more evacuation holes are located.
    It is of course also possible that the base has a wavy or sawtooth-shaped geometry so that it protrudes or bends in at regular intervals (or irregularly) and that evacuation holes are located in the indentations where particles are led and can disappear out through the evacuation holes. Another conceivable design is that the base of the roller forms a contour tapered in its longitudinal direction so that the roller at its base is narrower at one side of the cylinder than at the other and that particles are directed towards evacuation holes located at one side of the cylinder.
    A way of further improving the properties of the wash drum (cylinder) in terms of both its drainage properties and its ability to perform a gentle centrifugation can be achieved by the outer surface of the cylinder comprising at least one axially limited first zone with drainage holes (3) primarily intended to provide good drainage at washing (drainage zone) and another axially limited second zone with drainage holes mainly supported by the laundry (centrifugation zone). It is obvious to the person skilled in the art that such a division intended to accommodate a centrifugation in different zones would also be possible without them being used in a drum provided with evacuation holes in the whales. It is also obvious that the measures given below to control the washing in the drum also work without evacuation holes in the whales.
    In the case provided with two or (centrifugation zones and drainage zones), the drum should be designed so that the drum is several different zones the laundry is primarily directed to the zone or zones of the drum which are intended for gentle centrifugation. In many cases, when a gentle spin is desired, it is a matter of laundry which is relatively fragile and many times such laundry is washed separately or in batches with relatively little laundry in the cylinder so that it is not full. The laundry can thus be guided more or less to different zones of the cylinder in axial direction by various measures. Such a control could take place, for example, by the center axis of the cylinder inclined so that the laundry is guided towards that of the two edges in the axial direction.
    It is also possible to steer the goods by allowing the circumferential surface of the cylinder to be bent, for example by allowing the cylinder to taper slightly in the middle so that it has a smaller radius at its center in the axial direction than at its axial ends, i.e. a slightly hourglass-shaped contour, which moves the laundry towards its ends in the axial direction. It is also possible to imagine that the cylinder has a larger radius at its center in the axial direction than at its axial ends so that it has a barrel-shaped contour and that the laundry in such a cylinder is guided away from the ends of the "barrel" towards the barrel in the middle of axial joint. Another possibility is that the cylinder is slightly cone-shaped and has the shape of a truncated cone so that its radius at its one axial end is smaller than its other axial end and the laundry is thus guided towards that end with a larger radius when washing.
    It may also be possible to guide the laundry to different zones of the cylinder through the design of the cylinders of the cylinder. The side surface of the roller may be formed at its upper part or distal end, i.e. the end of the side surface which is located furthest from its base at the mantle surface of the drum, so that it is concave, convex or wedge-shaped in its longitudinal extent so that laundry is guided in axial direction at rotation of the cylinder towards the zone of the cylinder in the axial direction intended for centrifugation of the laundry. Preferably, at least the upper third of the side surface is formed in this manner and in some cases the entire side surface from its base to its distal end may have such a configuration. It should be noted that the whale does not need to have such a special configuration along its entire longitudinal extent, but in many cases only a part of the whale is designed in this way to a longitudinal extent. Another way of guiding the laundry towards the desired part in the axial extent of the cylinder may be to let the angle between the side surface of the cylinder and the mantle surface of the cylinder differ along the longitudinal extent of the cylinder. Because the inclination of the whale differs, the laundry's ability to follow the whale during rotation will differ along the longitudinal extent of the whale.
    If the angle between the valks is relatively right, ie around 90 degrees or even below 90 degrees, then the laundry will be carried with a relatively long distance. If, on the other hand, the angle is greater than 90 degrees, for example from 105 degrees and upwards, then the laundry will release from the whale at an earlier stage.
    As the laundry releases, laundry that lies next to the laundry will be able to move towards the space that becomes empty and thus the laundry is guided to the desired part of the cylinder in the axial direction. The movement of the laundry towards the space that has become empty often takes place as a result of the laundry having been partially compressed and that a spontaneous displacement of the laundry takes place in the direction of the space which becomes empty when the laundry releases the roll. The control of the laundry is of particular interest for the centrifugation phase of the washing cycle and the cylinder is therefore intended to be designed so that the part of the roll located in the centrifugation zone or zones has an average greater angle than the part of the roll (5) located in the drainage zone or zones, which means that the laundry will, upon rotation of the cylinder, drop earlier from the parts of the roll located in the centrifugation zone and the laundry will thus be directed towards the centrifugation zone.
    According to an embodiment of the invention, the above two different principles for designing the roller to guide the laundry can be combined, ie that the roller has different inclination at different parts of its longitudinal extent so that the laundry releases earlier at the parts that are more angled and that is concave, convex or wedge-shaped to its longitudinal extent so that laundry is guided in the axial direction when the cylinder rotates. These features are preferably arranged so that they cooperate to steer the laundry towards the desired axial position, which is normally the zone of the cylinder where it is desired that the laundry should be located during centrifugation. In cases where the cylinder contains rollers provided with evacuation holes, these can advantageously be placed in the first zone divided in the axial direction (first type of zone) which is intended for good drainage (the drainage zone).
    Normally, for a cylinder comprising different types of axially defined zones, the average area of the drainage heel in the first zone, the drainage zone, is larger than the average area of the drainage heel in the second zone, the centrifugation zone. The different zones can for instance consist of equal, round drainage holes in each zone in the mantle surface of the cylinder and the holes in the centrifugation zone can have a diameter of between just under 2 mm up to 4 mm while the radius of the holes in the drainage zone is between about 3 mm up to approx. 5mm. These values normally apply to a washing machine intended for home use and normal laundry in a home.
    Deviations in hole size can of course occur, especially for washing machines intended for other areas of use. Normally, however, the hole area (or in cases where there are holes with different areas within each zone, the average heel area in that zone) is preferably at least twice as large for the holes in the drainage zone than for the holes in the centrifugation zone.
    A cylinder can thus be designed so that at least the width of one of its ridges at its distal end is narrower in the middle third of the distribution of the roll in its longitudinal direction than in the two outermost thirds. This means that the whale in its upper part, ie. the part of the whale or the side wall of the whale which is furthest from its base, is designed so that at a normal position in the cylinder with an extension in the longitudinal direction substantially parallel to the axial direction of the cylinder and along most of the length of the cylinder in the axial direction, it is wider at its ends placed closer to the axial ends of the cylinder than at the axial center of the cylinder, i.e. the distal part has an hourglass-like contour. According to one embodiment, such a contour in the upper, distal part of the whale is combined with an outwardly bulging contour at the base, in the middle in the longitudinal direction of the whale and tapered at its ends. Such a shape of the roller would, in the case where the roller is attached to the mantle surface of the cylinder with an extension in the longitudinal direction substantially parallel to the axial direction of the cylinder, result in washing goods, i.e. rotation of the drum about its axis, that goods or particles which are primarily in contact with the whale at its base will be directed towards the axial ends of the cylinder while particles or goods which are primarily in contact with the upper part of the whale and the distal end of the whale side walls would be centered towards middle. Normally this means that small particles which abut the mantle area of the drum, for example gravel, are mainly in contact with the eel at its base and are directed towards the ends of the eel while larger units, normally laundry, usually abut more towards the upper part of the eel and thus steered towards the center of the whale. Such a design can be considered particularly suitable for a cylinder which in a zone around the cylinder in the axially extending central part of the cylinder is mainly designed with drainage heels to provide support for a gentle centrifugation of the laundry which corresponds to a centrifugation zone and that the cylinder around if the cylinder in the axially extending outer zones on each side of the central zone is primarily designed with drainage heels to provide good drainage of the drum during washing, which corresponds to a drainage zone. If the whales are also provided with drainage heels, in this case they are preferably located in the outer zones, the drainage zones, or close to them.
    The design of the whale at its base and at different heights does not always have to be adapted one after the other and can be designed independently of each other depending on which functions one wishes to achieve. For example, it is possible to combine a whale whose average width at its base is wider in the middle third of the whale's distribution in its longitudinal direction than in the two outermost thirds with many different shapes of the whale in its upper parts, if it is only of interest, for example. to guide the objects and particles which are relatively small and abut against the cylinder mantle surface in its lower region, for example gravel, and it is not of any interest to try to steer other larger goods, for example laundry, to any particular axial position. It is also obvious that it is a matter of combining different shapes on the roller with different geometries on the cylinder itself to strengthen the effect of the control of particles and laundry or to let different effects complement each other. In many cases, it is undesirable for laundry and / or particles to be guided too far out towards the edges of the cylinder in the axial direction. This can be remedied, for example, by the radius of the cylinder being larger in the middle of its axial extent than at the respective axial end. Such a design of the cylinder may be suitable, for example, if the average width of the whale at its base is wider in the middle third of the width of the whale in its longitudinal direction, for example by being rounded leaky, than in the two outermost thirds, where the whale may be substantially straight.
    In the case of the manhole with evacuation heels, these may in this case be located on either or both of the outer thirds so that particles and gravel are rotated out of the center by rotation of the cylinder by the shape of the whale while gravel and particles at the distal ends of the drum the net is transported by the mold on the mantle surface of the drum and the particles are thus both transported from the ends and the center towards the evacuation heel.
    In the text of the application, the word cylinder has been used most frequently to describe the rotating body which, with its mantle surface in radial direction, delimits the space in which the laundry is normally placed and which normally rotates during washing.
    In this context, a cylinder should not be strictly interpreted as the mathematical concept of a cylinder, but may have a shape that differs somewhat from the shape of a mathematical cylinder, even though its contour is broadly similar to that of the cylinder. What is meant by cylinder in the application has also in some contexts been mentioned here as a washing drum or only a drum.
    DESCRIPTION OF THE FIGURES Fig. 1 embodiment of the invention with a first type of evacuation heel shows a cylinder in perspective provided with a cap according to a first 10 Fig. 2 shows an axial cross-section of the cylinder in Fig. 1 according to the first embodiment Fig. 3 Fig. 4 shows a whale according to the first embodiment of the invention in perspective from above Fig. 5 shows a whale according to the first embodiment of the invention in perspective from below Fig. 6 shows a cylinder in Fig. 7 shows an axial cross section of the cylinder in Fig. 6 according to the second embodiment. Fig. 8 shows an enlargement of a roll from Fig. 6 according to the second embodiment. Fig. 9 shows a roll according to the first embodiment of the invention in perspective from above with a second type of evacuation hole Fig. 10 shows a roll according to the first embodiment but of the invention in perspective from above with a third type of evacuation hole PREFERRED EMBODIMENT (s) Figures 1 and 2 show a cylinder 1 intended to be placed in a washing machine, it forming part of the limiting surface of the laundry intended to be washed in the washing machine. . The figures show the cylinder with openings at its two ends in the axial direction. When mounted in a washing machine, one of the openings will be closed by a back piece, while its front end can normally be closed with a door in the front of the washing machine and which is used to make it possible to fill or empty the cylinder 1 of laundry.
    The cylinder 1, or the washing drum as it is also called, has a jacket surface 2 which normally consists of stainless metal but can also be made of other materials. For the idea of the invention, the choice of material of the cylinder 1 is not considered to be of any major importance. The jacket surface 2 has been provided with a number of drainage heels 10 15 20 25 30 13 3, 4 which are to enable washing and rinsing water to pass through the jacket surface 2 of the cylinder and thereby give a good washing and rinsing effect. equally large drainage holes 3,4 but there are also variants with different sized holes and in The most common are probably cylinders with the cylinder 1 shown here there are two axially outer regions with larger drainage holes 3 and these holes are advantageous mainly due to its good ability to discharge particles and water from the cylinder 1 while the central region of the cylinder 1 is provided with smaller drainage holes 4 which makes the surface of the cylinder less uneven or lacks larger cavities and therefore provides a better support when spinning laundry. These different zones can serve as examples of what are referred to herein as centrifugation zones (the central zone with smaller holes) as well as drainage zones (the zones with larger drainage holes on both sides of the centrifugation zone).
    The cylinder is also provided with three rollers 5, of which only one of them is clearly visible in the figure, while the others can only be sensed by the design of the outside of the lower part of the drum in figure 1, where the cylinder under the roll has been provided with outlet holes 12, upper, left part of the figure. The three rollers 5 are equidistantly placed around the mantle surface of the cylinder 1 so that the rollers 5 are rotationally symmetrically placed. The longitudinal extensions of the rollers 5 are in this case parallel to the central axis of the cylinder, although they could conceivably have an extension which is slightly angled with respect to the axial direction of the cylinder.
    Figure 3 shows the visible cap from Figure 1 in magnification. In this figure it is possible to see more clearly the evacuation holes 6 which are located on the wall 5, or more precisely in the side surface 7 of the wall relatively close to the longitudinal ends of the wall. The evacuation holes 6 are located at the base 8 of the whale so that they adjoin the mantle surface 2. The holes are rectangular, which is clearer in Figure 4. It is also clear here the general shape of the whale which at its base 8 is evenly thick at its longitudinal ends but 10 15 20 25 30 14 leaking or convex at the longitudinal central part of the whale, ie the central part of the cylinder in the axial direction. At the upper part of the whale and distal end 9, i.e. the part which is furthest from the base of the whale, it applies that the whale 5 is evenly thick at its longitudinal ends while the longitudinal middle part is bulging inwards and the upper part of the whale 5 thus resembles the contour of an hourglass. In this embodiment, the main part of the middle part or the middle segment of the roller 5 is formed with a surface which has a shape similar to a part of a sphere or a sphere which at the bottom at the base 8 has been provided with an edge. The reason for this design is to provide a middle part of the side surface 7 of the roll which slopes more than the outer parts of the roll 5 relative to the mantle surface 2 of the cylinder and thereby to cause the laundry to fall off the roll 5 at an earlier stage when rotating the cylinder 1 and in the middle part of the cylinder 1 makes the laundry easier to move towards the center of the cylinder 1 and thus causes a movement of the laundry in the desired direction.
    With a roller 5 designed and placed in the cylinder 1 according to the first embodiment, the laundry will thus be guided to the middle part of the cylinder (centrifugation zone) which due to its design with the relatively small drainage holes 4 is specially adapted for centrifuging laundry. evenly sized and round with a hole diameter of 2.2 mm. while the round, In this embodiment, the holes in the centrifugation zone are equal to the holes in the outer drainage zones are 3.3 mm. It is of course possible to use other sizes or shapes of the holes in the different zones and the holes do not have to be equal or uniform within a zone.
    Figure 4 shows a view of the roller 5 according to the first embodiment seen from above. Here the evacuation holes 6 are clearer and you can see that they have a rectangular shape. A suitable size of the holes is that they are about 10 mm long and 5 mm high, ie. has an area of about 50 square millimeters. This can be compared with the drainage holes 3, 4 sizes which are about 7 and 10 square millimeters respectively. The evacuation hole 6 is thus in this case 5 times as large as the large drainage holes 3, 4 and the evacuation heel 6 can vary considerably and as the largest drainage holes 3. The size difference between is usually in the range 2 to 10 times difference.
    Figure 5 shows the selection 5 in perspective from below. It can be seen here how the evacuation heel 6 is connected via a channel 10 to an outlet 11 where the particles can be transported out of the cylinder 1. The outlet 11 is adapted to fit with specially punched out outlet holes 12 in the cylinder (see figure 1) which are placed under the roller 5 The channel 10, the outlet 11 and the outlet hole 12 should be designed so that particles and the like which can pass through the evacuation heel 6 do not get stuck in any of these but can be transported out of the cylinder 1.
    Figures 6, 7 and 8 substantially correspond to Figures 1, 2 and 3 but show a roller 5 'according to a second embodiment of the invention. In this embodiment, the portion which in the first embodiment was located in the middle of the cylinder 1 (see Figure 1) has been displaced towards one of the edges of the cylinder 1 '. Thus, upon rotation of the cylinder 1 ', the laundry will be moved to the place where the roller 5' is tapered at its distal end 8, which corresponds to a location in the axial direction of the cylinder 1 'which is located closer to one edge and has a centrifugal zone delimited in the axial direction. around the cylinder which is provided with relatively small drainage holes 4 and acts as a good support surface for the laundry during centrifugation. Preferably, this centrifugation zone is offset towards the side of the cylinder 1 'which is closest to the rear part of a washing machine when the cylinder is mounted in one. The reason is that the cylinder is usually, for a front-loading washing machine, suspended and stored in the rear part of the washing machine and by guiding the laundry towards the rear part, the forces acting on the suspension when spinning are lower than if the laundry is placed further in the cylinder, ie. closer to the part closest to the feed slot. 10 15 20 16 In this embodiment, there are no evacuation holes in the 5 ”roll. It is of course possible to provide the roll 5 'according to the second embodiment with evacuation holes if desired. Of course, it is also possible to conversely use such a cap as shown in Figures 1-5 according to the first embodiment of the invention without any evacuation hole if it is only the function of the cap 5 to axially surface the laundry which is of interest.
    Figure 9 shows a second type of evacuation hole 6 'in the form of a semicircular hole in the whale 5 and Figure 10 shows a third type of evacuation hole 6 "in the form of a triangular hole. Thus, there can be a number of different shapes and sizes of holes which is possible to use.
    In the various figures shown, these have shown that each whale is provided with 2 evacuation holes on each side of the whale. It is obvious that the whale can be provided with fewer or more holes if desired and that these can have different shapes. For example, one hole could be relatively narrow and but wide and another hole more square or round so that the holes can be adapted to allow the passage of particles of different shapes. According to a further example, the whale in its lower part may have a more damper-like system so that it resembles a ridge which has slit-like openings along part or all of the lower part of the whale at its base. There are thus a number of variants of what the evacuation holes can look like which are within the scope of the invention.
    权利要求:
    Claims (1)
    [1]
    A cylinder (1) for a washing machine which comprises a jacket surface (2) and at least one cap (5), characterized in that the side surface (7) of the cap (5) at its distal end (9) is concave, convex or wedge-shaped so that the laundry is guided from a zone of the cylinder (drainage zone) in the axial direction when rotating the cylinder (1) towards the zone of the cylinder (centrifugation zone) in the axial direction intended for centrifuging the laundry. Cylinder (1) according to claim 1, in which the outer surface (2) of the cylinder comprises at least one axially limited first zone with drainage holes (3) primarily intended to provide good drainage during washing (drainage zone) and a further axially limited second zone with drainage holes (4) primarily intended to provide support for the laundry during centrifugation (centrifugation zone). Cylinder (1) according to any one of claims 1 and 2, in which the angle between the side surface (7) of the roll (5) and the outer surface (2) of the cylinder differs along the longitudinal extent of the roll and that the part of the roll (5) which is located in the centrifugation zone or the centrifugation zones has an average greater angle than the part of the roller (5) which is located in the drainage zone or zones. Cylinder (1) according to any one of the preceding claims, in which the average area of the drainage holes (3) in the first zone, the drainage zone, is larger than the average area of the drainage heel (4) in the second zone, the centrifugation zone, preferably at least twice as large. Cylinder (1) according to any one of the preceding claims, in which the average width of the whale (5) at its distal end (9) is narrower in the middle third of the width of the whale (5) in its longitudinal direction than in the two outermost thirds. A cylinder (1) according to any one of the preceding claims, in which the average width of the whale (5) at its base (8) is wider in the middle third of the width of the whale (5) in its longitudinal direction than in the two outermost thirds. Cylinder (1) according to any one of the preceding claims, in which the radius of the cylinder is greater in the middle of its axial extent than at the respective axial end. with at least one evacuation hole (6). Cylinder (1) according to claim 8, in which the evacuation hole (6) adjoins the jacket surface (2). Cylinder (1) according to any one of claims 8 and 9, in which the area of the evacuation hole (6) is at least 2 times as large as the average area of the drainage holes (3, 4) in the jacket surface (2) of the cylinder (1), more preferably at least 3 times as large and preferably 4 times as large. Cylinder (1) according to any one of claims 8-10, in which the area of the evacuation hole (6) is larger than the largest drainage hole (3) in the outer surface (2) of the cylinder and preferably at least 2 times as large as the largest drainage hole (3) area. Cylinder (1) according to any one of claims 8-11, in which the area of the evacuation hole (6) is at least 20 square millimeters, preferably at least 30 square millimeters and most preferably at least 40 square millimeters in size. Cylinder (1) according to any one of claims 8-12, in which the angle between the side surface (7) of the roller (5) in which the evacuation hole (6) is located and the outer surface (2) of the cylinder is less than 135 degrees, preferably less than 120 degrees and preferably less than 105 degrees. Cylinder (1) according to any one of claims 8-13, in which the roller (5) at its base (8) is wedge-shaped, concave or convex so that particles are guided in the axial direction towards the evacuation hole (6) when the cylinder (1) rotates ).
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