CN115191878A

CN115191878A - Device for cleaning floor cloth

Info

Publication number: CN115191878A
Application number: CN202210331908.5A
Authority: CN
Inventors: F·施尼策; K·丹尼尔; J·盖斯
Original assignee: BSH Hausgeraete GmbH
Current assignee: BSH Hausgeraete GmbH
Priority date: 2021-04-01
Filing date: 2022-03-31
Publication date: 2022-10-18
Also published as: DE102021203332B3; EP4070711B1; EP4070711A1

Abstract

The invention relates to a cleaning device for cleaning an earth fabric for an automatic floor cleaning machine, comprising a radially water-permeable drum which is provided for accommodating the earth fabric on its outer circumferential surface; a wetting mechanism for a ground fabric mounted on the drum; and a control device which controls the drum in such a way that the ground fabric is drawn out of or mounted on the floor cleaning machine travelling over the drum.

Description

Device for cleaning floor cloth

Technical Field

The invention relates to a device for cleaning floor cloths (Bodenuch). The invention relates in particular to the cleaning of the floor cloths of automatic floor cleaning machines.

Background

Automatic floor cleaning machines are provided for autonomously cleaning a floor surface. The floor can be in particular at home and can be cleaned by vacuuming or wiping. Some floor cleaning machines have a mop that is guided over the floor to clean the floor. The mop can be used dry or wet and removes certain types of dirt from the floor better than a vacuum cleaner.

If the mop is run longer, it may become full of dirt so that it cannot hold additional dirt. Then, the cleaning or conditioning effect of the mop may be reduced. To restore the cleaning ability of the floor cleaning machine, the mop can be cleaned or replaced by an operator. However, large floors cannot be cleaned by floor cleaning machines without care because of the required intervention. The need for regular interventions in the cleaning operation of floor cleaning machines has led to the consideration of their automatic cleaning purpose.

WO 2020/125 774 A1 proposes designing the mop as a cartridge which can be automatically replaced in the base station of a floor cleaning machine. However, it is always also necessary to remove the contaminated cartridge from the base station and provide a new cartridge.

Disclosure of Invention

The object of the invention is to provide an improved technique for automatically cleaning the ground fabric of an automatic floor cleaning machine. The invention solves this object by means of the subject matter of the independent claims. The dependent claims reflect preferred embodiments.

According to a first aspect of the invention, a cleaning device for cleaning an earth ground for an automatic floor cleaning machine comprises: a radially water-permeable drum provided for accommodating the ground fabric on its outer circumferential surface; a wetting mechanism for an earth fabric mounted on the drum; and a control device for controlling the drum in such a way that the ground fabric is drawn out of or mounted on the floor cleaning machine travelling over the drum.

It is particularly preferred that the control device is provided for automatically transferring the floor arrangement from the floor cleaning machine and/or for automatically transferring the cleaned floor arrangement back to the floor cleaning machine, so that the floor cleaning machine can use the floor arrangement for further cleaning. The use of the cleaning device makes it possible to eliminate the intervention of the user in order to clean or replace contaminated ground on the floor cleaning machine. The floor area cleaned by means of the cleaning device can be reused on the floor cleaning machine, so that the environmental load can be reduced by multiple uses. The ground fabric may comprise a flexible cloth; a frame, cartridge or other rigid element may not be required to enable it to be suitable for use in a floor cleaning machine.

The ground cloth can be mounted on the floor cleaning machine, for example, by means of velcro. For cleaning, the ground fabric can therefore be reliably held on the floor cleaning machine and nevertheless drawn off from the floor cleaning machine by means of the drum. The mounting of the floor cleaning machine can be effected simply by pressing. During the travel of the floor cleaning machine over the drum, the drum can rotate, so that the ground fabric is wound onto the drum or unwound from the drum.

The direction of movement of the floor cleaning machine when receiving the ground arrangement can be opposite to the direction of movement of the floor cleaning machine when discharging. In one embodiment, the rotation of the drum is controlled by the cleaning device, and in another embodiment, caused by the floor cleaning machine being drawn out of the floor ground. The transfer of the ground fabric from the cleaning device to the floor cleaning machine can basically take place in the opposite way to the housing.

The side of the wound ground fabric which faces the floor during use on the floor cleaning machine may be directed radially inwards of the drum. The wetting mechanism can wash the cloth in a radial direction to loosen dirt from the cloth. In one embodiment, the ground fabric is flushed radially from the outside inwards, and the contaminated caustic wash liquid can be discharged in an axial or tangential direction.

Preferably, the drum comprises a first gripping element for engaging in the ground fabric and for withdrawing the ground fabric from the floor cleaning machine during travel of the floor cleaning machine over the drum. This engagement can be carried out in a form-fitting manner and, for example, by means of a snap ring (Schlaufe) attached to the ground. Alternatively, the engagement can also be effected with a force fit, in particular by clamping the ground fabric on the drum. By means of this engagement, an automatic transfer of the ground fabric from the floor cleaning machine to the cleaning device can be achieved.

The first gripping element is preferably provided for engaging in the region of the front edge of the ground fabric; wherein the drum comprises a second gripping element which is provided for engagement in the ground fabric in the region of the rear edge. The front and rear edges of the ground fabric are produced by the movement of the floor cleaning machine relative to the cleaning device. For engaging the second gripping element, a further loop can be provided on the ground fabric. By using two gripping elements, the ground fabric can be held on the drum completely reliably. The ground cloth can be prevented from being detached during the cleaning process. The ground fabric tensioned onto the drum in this way can slip or wrinkle less during the cleaning process, so that it can then be mounted on the floor cleaning machine more automatically.

The first gripper element and/or the second gripper element can be radially displaceable on the drum, wherein a radial recess can be provided on the drum in the region of the gripper elements in order to accommodate the gripper elements. After the form-fitting engagement of the gripping element in the ground connection, the gripping element can be pulled into the radial recess. Subsequently, the gripping elements cannot protrude radially beyond the circumference of the drum. The ground fabric is better accessible for cleaning and can be prevented from being inadvertently drawn out by the engagement of the roller in the region of the section of the ground fabric that is positively connected to the gripping element.

Gripping elements may be provided for clamping the ground fabric on the drum. The ground fabric can thereby be held on the drum by means of a force fit. As an alternative or in addition to the form fit, a force fit can be realized, which can be present between the gripping element and the ground fabric. The ground fabric can be clamped in particular in the region of the recess by means of the gripping element, so that the ground fabric can be tensioned over the outer circumferential surface of the drum in the region of the clamping process. This reduces the formation of wrinkles on the ground fabric, so that the ground fabric can be cleaned better and can be mounted on the floor cleaning machine better after cleaning.

A caustic wash container can be disposed below the drum. The caustic wash tank is arranged to collect liquid flowing from the drum and/or rollers. Here, the drum may be partially immersed in the caustic wash liquid container. The wetting mechanism can be fed by means of liquid from the caustic wash tank, so that the liquid in the cleaning device can be circulated in a resource-saving manner. The alkaline wash tank may be arranged to separate deposits or suspended matter in the liquid, so that the liquid supplied to the wetting mechanism may have a reduced dirt load. Furthermore, a filter or other separating means may be provided for the dirt from the liquid. The caustic wash container can be removed from the cleaning apparatus so that contaminated liquid can be disposed of after the cleaning process. The uncontaminated liquid can be filled into the caustic wash vessel or a separate liquid vessel.

Furthermore, the cleaning device may comprise a roller with radial treatment elements; wherein the control device is provided for controlling the drum and the roller in such a way that the treatment element engages into the ground fabric in order to clean the ground fabric.

The rollers are preferably mounted parallel to the drum at a predetermined distance and may have different sections in the circumferential direction in order to perform different functions. Different processing elements may be mounted on these sections. To select one of these functions, the roller may be placed in a corresponding position with respect to the drum.

In one embodiment, an axially extending sealing lip is mounted on the roller in order to seal the radial gap between the cylinder and the roller. The area between the cylinder and the roller above the sealing lip can then be flooded with water, for example in order to separate coarse dirt from the ground fabric. The drum can also rotate relative to the stationary roller so that the sealing lip sweeps over the ground. Water can thus be scraped off the ground fabric.

Furthermore, axially extending recesses can be provided on the roller in order to form radial gaps between the cylinder and the roller. Thus, the drum can be better rotated about its rotational axis without the rollers coming into contact with the drum or an earth ground mounted on the outer circumferential surface of the drum. In particular, when the ground cloth is transferred between the cleaning device and the floor cleaning machine, a possibly disturbing influence of the roller can be prevented thereby. The recess can adjoin the sealing lip in the circumferential direction, so that the sealing lip has an increased clearance for bending in the circumferential direction. Two recesses can also be provided, which are located on different sides of the sealing lip in the circumferential direction. The two cutouts can be of different sizes.

The dampening means is preferably arranged to convey liquid into the area between the cylinder and the roller. The ground fabric can therefore be treated directly with water better. Dirt contained in the ground fabric can be washed out in a targeted manner by the liquid. The liquid is preferably water-based and may include a cleaning agent.

According to a further aspect of the invention, a base station for an automatic floor cleaning machine comprises a cleaning device as described herein for cleaning an earth ground for the automatic floor cleaning machine. The base station can additionally be provided for supplying the floor cleaning machine in other ways. For example, the base station may supply electrical energy and/or fresh water to the floor cleaning machine. In addition, the base station can transfer dirt or contaminated liquid from the floor cleaning machine. Furthermore, the base station can exchange data with the floor cleaning machine, in particular data about cleaning of the floor that has already taken place or is about to take place.

According to a further aspect of the invention, a method for cleaning an earth ground of an automatic floor cleaning machine comprises the following steps: automatically transferring the ground fabric from the floor cleaning machine to the cleaning device during travel of the floor cleaning machine past the cleaning device; cleaning the ground cloth in a cleaning device; and automatically mounting the ground arrangement on the floor cleaning machine during the travel of the floor cleaning machine past the cleaning device. The method may be performed in particular by means of the cleaning device described herein.

According to a further aspect, a system comprises an automated floor cleaning machine and a cleaning device as described herein, wherein the floor cleaning machine is provided for accommodating an earth ground on its underside; the ground fabric is guided over the ground surface in order to clean the ground surface, and is driven past the cleaning device in order to transfer the ground fabric to the cleaning device or to be received by the cleaning device. Furthermore, a floor cleaning machine and a cleaning device can be provided for mounting the ground arrangement cleaned by means of the cleaning device on the underside of the floor cleaning machine.

Drawings

The invention will now be described in more detail with reference to the accompanying drawings, in which:

FIG. 1 shows a system with an automated floor cleaning machine and a base station;

figure 2 shows a schematic view of a cleaning device;

FIG. 3 shows a cylinder for a cleaning device;

FIG. 4 shows a roller for a cleaning device;

5A-5D illustrate steps in transferring an earth fabric from a floor cleaning machine to a cleaning device;

FIGS. 6A-6E illustrate steps for cleaning a ground fabric with a cleaning device;

figures 7A-7D illustrate steps for transferring the floor cloth from the cleaning apparatus to the floor cleaning machine.

Detailed Description

Fig. 1 shows a system 100 with an automatic floor cleaning machine 105 and a base station 110. The floor cleaning machine 105 comprises a cleaning device 115 and is provided for cleaning a floor surface, for example in a household. To this end, the floor cleaning machine 105 typically includes drivable wheels 120 for moving the floor cleaning machine 105 over the floor surface. In the embodiment shown, a ground roller 125 is additionally provided, which can roll on the ground. On the underside of the floor cleaning machine 105, a wiping mechanism 130 is mounted, on which an earth ground 135 can be fixed. This fixing can be achieved in particular by means of velcro. The wiping mechanism 130 can be provided for moving the ground fabric 135 relative to the floor cleaning machine 105 during travel of the floor cleaning machine 105 across a floor surface. Such a movement can in particular be oscillating and can be performed, for example, on a circular path or also linearly. It is preferred here that the orientation of the ground arrangement 135 remains the same with respect to the direction of travel of the floor cleaning machine 105. In particular, the front and rear edges of the ground fabric 135 can remain in a predetermined relative orientation with respect to the general direction of travel of the floor cleaning machine 105. One or more first tabs 140 may be provided on the front edge and one or more second tabs 145 may be provided on the rear edge. In this context, it is assumed that the front edge is the edge of the ground structure 135 which, when traversing the cleaning device 115 for displacing the ground structure 135, is located in the direction of travel and the rear edge is correspondingly located behind. The ground 135 can be designed symmetrically with respect to the edge, so that the front and rear edge can also be interchanged by rotating the ground 135 about a vertical axis.

The floor cleaning machine 105 is provided for driving to the base station 110 in a predetermined manner in order to fill up the store, to discharge further stores, to exchange data and/or to perform maintenance. Typically, the base station 110 is automatically operated by the floor cleaning machine 105 after a predetermined cleaning of the floor is completed. The base station 110 includes a wedge-shaped ramp 150 (Auffahrt) in the form of a ramp. If the floor cleaning machine 105 travels over the inclined surface 150, the wiping mechanism 130 and the ground cloth 135 pass over a recess in the inclined surface 150, under which the cleaning device 115 is located. In this manner, the cleaning device 115 may be in contact with the ground 135.

The invention provides that the cleaning device 115 can pull the ground cloth 135 out of the wiping mechanism 130 during the travel of the floor cleaning machine 105 past the cleaning device 115. Furthermore, it is proposed that the cleaning device 115 cleans the drawn-out ground fabric 135 and then fixes it back on the floor cleaning machine 105 in the opposite manner. For this purpose, the floor cleaning machine 105 can be driven in the opposite direction of travel through the recess, below which the cleaning device 115 is located.

Fig. 2 shows a schematic view of the cleaning device 115 in the base station 110. The cleaning device 115 includes a cylinder 205, a roller 210, a wetting mechanism 215 and a control device 220. The drum 205 and the roller 210 have rotational axes parallel to each other and may have substantially the same axial dimension. The radii of the drum 205 and the roller 210 may be equal to or different from each other. The axis of rotation preferably extends in a horizontal direction. The roller 205 is mounted in the cleaning device 115 in such a way that it is accessible through a recess in the ramp 150. In particular, a section of the roller 205 may protrude upward through a void in the ramp 150. The drum 205 and the roller 210 may each be assigned a drive 225 for controlling the movement about the respective axis of rotation. The drive 225 may also be provided for braking the rotation of the drum 205 or of the roller 210. In another embodiment, a controllable brake is provided in place of the drive 225.

The wetting mechanism 215 preferably includes a controllable pump 230 and one or more nozzles 235. The pump 230 is fed by the container in which the liquid is present. The spray nozzles 235 may spray or squirt liquid into the area between the drum 205 and the roller 210, and water dripping from the drum 205 or the roller 210 may be collected into the caustic wash tank 240. In the embodiment shown, the caustic wash tank 240 serves at the same time as a tank for the liquid pumped by the pump 230. The filter placed upstream of the pump 230 is not shown in fig. 2. Preferably, a plurality of nozzles 235 arranged in a direction parallel to the rotational axis of the drum 205 and the roller 210 are provided. In the embodiment shown, two rows of nozzles 235 are provided, one row being oriented increasingly in the direction of the drum 205 (vermehrt) and the other row being oriented increasingly toward the roll 210.

A first and/or second gripping mechanism 245 may be mounted on the drum 205. A catch 245 is provided for engaging into the ground fabric 135, in particular in the region of the

webs

140, 145. To facilitate engagement, the gripper 245 can be moved radially outward so that it protrudes around the circumference of the cylindrical drum 205. After the gripping means 245 has engaged in the ground arrangement 135, the gripping means 245 on the drum 205 can be pulled radially inward. The ground pad 135 can thus be clamped onto the drum 205 in a force-fitting manner. A recess 250 is preferably introduced in the region of the outer surface of the drum 205 in the region of the gripping means 245. The gripping mechanism 245 can then be pulled radially inward to such an extent that it is located within the recess 250 and no longer protrudes beyond the circular contour of the drum 205. The ground fabric 135 may be clamped between the gripping mechanism 245 and the roller 205 as it is drawn into the gripping mechanism 245.

The drum 205 may be hollow-cylindrically shaped, wherein it may be permeable to water in the radial direction. For example, the drum 205 may be made of a grating or a smooth material may be provided with a plurality of radial perforations. At the axial ends, the drum 205 may have spokes or be closed.

The roll 210 preferably includes a plurality of treating elements 255 each extending in a radial direction. The processing elements 255 can be regularly arranged along the circumferential direction. Axially adjacent treatment elements 255 can be displaced in the circumferential direction. At a point along the circumference, a sealing lip 260, which is preferably flexible, can be formed on the roller 210. At another point in the circumferential direction, in particular adjacent to the sealing lip 260, an axially extending recess 265 can be provided, which is dimensioned such that a through-opening to the drum 205 is provided due to the respective orientation of the roller 210. For this purpose, the recess 265 can face the drum 205 or its axis of rotation. In the embodiment shown, two cutouts 265 are provided, the two cutouts 265 being located on opposite sides of the sealing lip 260 in the circumferential direction.

Fig. 3 shows a drum 205 with an earth ground 135. In the upper region, a drum 205 is shown, which has an earth ground 135 that has not yet been wound, in the middle region a wound, one-sided locked earth ground 135 and in the lower region a double-sided locked earth ground 135.

The ground fabric 135 is provided such that

tabs

140, 145 can project in a horizontal direction, and the ground fabric 135 is mounted on the wiping mechanism 130 (see fig. 1). In the upper illustration of fig. 3, the first web 140 is guided in the circumferential direction into a radially outwardly protruding (ausstellen) catch 245. To transfer the ground fabric 135 to the drum 205, the gripping mechanism 245 can be moved radially inward in order to establish a force fit with the ground fabric 135. The drum 205 may then be rotated such that the ground fabric 135 is wound around the outer circumferential surface of the drum 205. If the ground cloth 135 is also fixed to the floor cleaning machine 105 during this process, the floor cleaning machine should accordingly be moved in a tangential direction relative to the drum 205. In this case, the hook and loop fastener holding the ground fabric 135 to the wiping mechanism 130 can be automatically released.

The center illustration in fig. 3 assumes that the ground fabric 135 is completely released from the wiping mechanism 130. The floor cleaning machine 105 may then be moved to a position where it does not interfere with the operation of the cleaning device 115. For example, the floor cleaning machine 105 may travel slightly forward or further rearward. Before or after the ground fabric 135 is separated from the wiping mechanism 130 in the region of the second web 145, the second gripper mechanism 245 can be extended in the radial direction from the drum 205. The second tab 145 may then snap into the second grasping mechanism 245. The second catch means 245 can then be pulled radially inward in order to establish a force fit with the ground connection 135 in the region of the second tab 145.

In the lower illustration of fig. 3, the second gripping mechanism 245 is also pulled radially inward and applies the ground fabric 135 onto the circumference of the drum 205.

Fig. 4 shows a roller 210 for the cleaning device 115. In the upper region, the complete roller 210 is shown, and in the lower region, an enlarged axial section is shown. Here, differently shaped processing elements 255 are used.

The roller 210 may be designed in one piece or in multiple pieces. In one embodiment, a body is provided, which may be made of plastic, for example, and to which the treating elements 255 may be individually or continuously secured. The sealing lip 260 is preferably made of a flexible material that can be fitted over the roller 210. For example, radial grooves can be provided on the body of the roller 210 into which the sealing lip 260 can be pushed or pulled.

Hereinafter, different processes of the cleaning device 115 will be described in more detail. In this case, the embodiment according to fig. 2 is assumed as an example. Fig. 5A to 5D relate to the automatic transfer of the ground arrangement 135 from the floor cleaning machine 105 to the cleaning device 115.

In fig. 5A, the gripping means 245 of the drum 205 projects radially and engages in a first web 140 of the ground fabric 135 mounted on the underside of the floor cleaning machine 105. The roller 210 is disposed such that the vacant section 265 thereof faces the drum 205, so that the drum 205 can rotate without rubbing against the roller 210.

In fig. 5B, the first gripping mechanism 245 is pulled radially inward and establishes a friction fit connection with the first tab 140. The drum 205 rotates a distance in a clockwise direction and the floor cleaning machine 105 travels a corresponding distance up and to the right on the ramp 150 relative to the cleaning device 115. Movement of the floor cleaning machine 105 relative to the drum 205 may be coordinated with the rotation of the drum 205. To this end, the cleaning device 115 and the floor cleaning machine 105 can communicate with each other by means of a suitable communication mechanism. Typically, one of the

components

105, 115 is present as a control element and the other component is present as a controlled element.

In fig. 5C, these movements continue until the ground fabric 135 is almost completely removed from the floor cleaning machine 105. The second gripping mechanism 245 projects radially and engages into the second tab 145 at the rear end of the ground fabric 135 with respect to the direction of movement of the floor cleaning machine 105.

In fig. 5D, the second catch mechanism 245 is also closed and pulled radially inward, so that here too a force-fitting connection with the ground connection 135 is established. The ground 135 is here completely tensioned on the outer circumference of the drum 205. The floor cleaning machine 105 is moved such that it does not interfere with the movement of the drum 205. For this purpose, the floor cleaning machine 105 can be driven forward or backward to such an extent that it does not come into contact with the drum 205. Alternatively, the floor cleaning machine 105 can also be lifted from the cleaning device 115 or lowered with respect to the floor cleaning machine 105 or the ramp 150.

Fig. 6A to 6E relate to an exemplary washing process of the ground arrangement 135 in the cleaning device 115. Here, the floor cleaning machine 105 is in a position in which it does not impede cleaning.

In fig. 6A, the roller 210 is rotated such that the sealing lip 260 bears against the drum 205. Liquid is delivered through the nozzles 235 into the area between the drum 205 and the roller 210 so that the ground fabric 135 is flooded with liquid. Here, the drum 205 can rotate in the clockwise direction, while the roller 210 is stationary, so that the ground fabric 135 can be traversed at all points by the liquid from the nozzles 235.

In fig. 6B, during rotation of the roller 210, liquid is continuously delivered through the nozzle 235 such that the treating elements 255 rub through (durchwalk) the ground arrangement 135 on the surface of the drum 205. To this end, the roller 210 may be rotated relative to the drum 205. Drum 205 may be rotated slowly or in stages to expose all segments of ground fabric 135 to the action of treatment elements 255.

In fig. 6C, the roller 210 is rotated to a position similar to that in fig. 6A, but without delivering liquid from the nozzle 235. The drum 205 may rotate in a clockwise direction, thereby forcing liquid radially inward through the ground fabric 135 or drawing it out or scraping it in a circumferential direction.

In fig. 6D, the ground fabric 135 may be treated in a manner similar to fig. 6B, but without the supply of liquid through the nozzles 235. Here, the pile of the ground fabric 135 can be rubbed through and/or loosened. The rotation of the roller 210 relative to the ground cloth 135 can take place in any direction or also in an oscillating manner.

In fig. 6E, the roller 210 is rotated to a position where it does not contact the ground cloth 135 on the drum 205. In this position, the ground arrangement 135 can be dried until it is needed again by the floor cleaning machine 105. To accelerate the drying process, a blower may be used.

Fig. 7A to 7D relate to the transfer of the ground arrangement 135 from the cleaning device 115 to the floor cleaning machine 105.

In fig. 7A, the second gripper mechanism 245 is opened and the ground fabric 135 rests in this region against the underside of the floor cleaning machine 105. For this purpose, the floor cleaning machine 105 can be driven in the longitudinal direction into a suitable position.

In fig. 7B, the floor cleaning machine 105 has traveled a distance to the left and the drum 205 has rotated a corresponding distance in the counterclockwise direction, so that the ground fabric 135 is unwound from its outer circumferential surface and applied onto the underside of the floor cleaning machine 105.

Fig. 7C shows a situation in which the ground cloth 135 is completely mounted on the underside of the floor cleaning machine 105. The first gripping mechanism 245 is opened in order to separate the ground fabric 135 from the cleaning device 115.

In fig. 7D, the floor cleaning machine 105 is away from the cleaning device 115 or base station 110. The drum 205 can remain in the position shown, in which the floor mat 135 can be transferred again by the floor cleaning machine 105 (see fig. 5A).

List of reference numerals

100 System

105 floor cleaning machine

110 base station

115 cleaning device

120 wheel

125 ground roller

130 wiping mechanism

135 ground cloth

140 first connecting piece

145 second tab

150 inclined plane

205 roller

210 roller

215 wetting mechanism

220 control device

225 driving device

230 pump

235 nozzle

240 alkaline washing liquid container

245 grabbing mechanism

250 concave part and groove

255 processing element

260 sealing lip

265 left empty.

Claims

1. A cleaning device (115) for cleaning an earth ground (135) for an automatic floor cleaning machine (105), wherein the cleaning device (115) comprises:

-a radially water-permeable drum (205) provided for housing the ground fabric (135) on its outer circumferential surface;

-a wetting mechanism (215) for an earth fabric (135) mounted on the drum (210); and

-a control device (220) for controlling the drum (210) in such a way that the ground fabric (135) is drawn off from or mounted on a floor cleaning machine (105) travelling over the drum (210).

2. Cleaning device (115) according to claim 1, wherein the drum (205) has a first gripping element (245) for engaging into the ground fabric (135) when the floor cleaning machine (105) travels over the drum (205) and for withdrawing the ground fabric (135) from the floor cleaning machine (105).

3. Cleaning device (115) according to claim 2, wherein the first gripping element (245) is provided for engagement in the region of a front edge of the ground fabric (135); wherein the drum (205) comprises a second gripping element (245) which is provided for engaging into the ground fabric (135) in the region of the rear edge.

4. Cleaning device (115) according to claim 2 or 3, wherein the gripping elements (245) on the drum (205) are radially movable; and a radial recess (250) is provided on the drum (205) in the region of the gripping element (245) in order to accommodate the gripping element (245).

5. Cleaning device (115) according to one of claims 2 to 4, wherein the gripping element (245) is provided for clamping the ground fabric (135) on the drum (205).

6. The cleaning device (115) according to any one of the preceding claims, further comprising a caustic wash tank (240) below the drum (205).

7. The cleaning device (115) according to any one of the preceding claims, further comprising a roller (210) with radial treatment elements (255); wherein the control device (220) is provided for controlling the drum (205) and the roller (210) in such a way that the treatment element (255) engages in the ground fabric (135) in order to clean it.

8. The cleaning device (115) according to claim 7, wherein an axially extending sealing lip (260) is mounted on the roller (210) for sealing a radial gap between the drum (205) and the roller (210).

9. The cleaning device (115) according to any one of claims 7 or 8, wherein an axially extending clearance (265) is provided on the roller (210) so as to form a radial gap between the drum (205) and the roller (210).

10. The cleaning device (115) according to any one of claims 7 to 9, wherein the wetting mechanism (215) is arranged for delivering liquid into an area between the drum (205) and the roller (210).

11. A base station (110) for an automatic floor cleaning machine (105), wherein the base station (110) comprises a cleaning device (115) according to any one of the preceding claims.

12. A method for cleaning an earth ground (135) of an automatic floor cleaning machine (105), the method comprising the steps of: -automatically transferring the ground arrangement (135) from the floor cleaning machine (105) to a cleaning device (115) during the travel of the floor cleaning machine (105) past the cleaning device; cleaning an earth ground (135) in a cleaning device; and the ground cloth (135) is automatically mounted on the floor cleaning machine (105) during the travel of the floor cleaning machine (105) past the cleaning device (115).

13. A system (100) comprising an automatic floor cleaning machine (105) and a cleaning device (115) according to any one of claims 1 to 10, wherein the floor cleaning machine (105) is provided for accommodating an earth ground (135) on its underside; guiding the ground arrangement (135) over a ground surface for cleaning the ground surface, and driving the floor cleaning machine (105) over the cleaning device (115) in order to transfer the ground arrangement (135) to the cleaning device (115) or to accommodate the ground arrangement (135) by the cleaning device (115).