CN114340459B

CN114340459B - Floor cleaning machine and method for operating a floor cleaning machine

Info

Publication number: CN114340459B
Application number: CN201980100039.1A
Authority: CN
Inventors: 法比安·莫泽; 迈克尔·沙尔马赫
Original assignee: Alfred Kaercher SE and Co KG
Current assignee: Alfred Kaercher SE and Co KG
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2023-08-08
Anticipated expiration: 2039-09-06
Also published as: EP4025105C0; US20220386839A1; CN116725436A; WO2021043425A1; PL4025105T3; EP4025105A1; EP4233662A2; EP4025105B1; CN114340459A; EP4233662A3

Abstract

The invention relates to a floor cleaning machine comprising a floor head (12), at least one cleaning roller (14) arranged on the floor head (12), a tank device (46) arranged on the floor head (12), and at least one cleaning element (70) associated with the at least one cleaning roller (14). In order to provide such a floor cleaning machine with an optimized coarse dirt pick-up function, it is proposed according to the invention that at least one cleaning element (70) is arranged on the tank device (46), and that at least one partial region of the tank device (46) on which the at least one cleaning element (70) is arranged is movable relative to the floor head (12) during the cleaning operation.

Description

Floor cleaning machine and method for operating a floor cleaning machine

Technical Field

The invention relates to a floor cleaning machine comprising a floor head, at least one cleaning roller arranged on the floor head, a tank arrangement arranged on the floor head, and at least one cleaning element associated with the at least one cleaning roller.

The invention also relates to a method for operating a floor cleaning machine, in which a cleaning roller is arranged on the floor head and coarse dirt is fed to the rotating cleaning roller via a sweeping element.

Background

WO 2018/099567 A1 discloses a cleaner for a dirt fluid with a movable sliding element.

US 2017/007437 A1 discloses a cleaning robot.

WO 2008/135120 A1 discloses a travelling sweeper with a brush roller and a sweeping edge.

US 2004/0181888 A1 discloses an additional cleaner.

US 2003/0028982 A1 discloses a sweeper.

EP 1,179,314 A1 discloses a sweeper with a sweeping roller.

US 4,701,969 discloses a sweeper with a rotating brush.

Further sweepers are disclosed in CN 104939758 and CN 2899698.

US 2006/0150363 A1 discloses a floor cleaning machine.

CN 2516091 discloses a floor wiping machine.

Surface cleaners are known from WO 2016/058901 A1, WO 2016/058856 A1, WO 2017/063663 A1, WO 2016/058879 A1 and WO 2016/058956 A1. A surface cleaning machine is also known from WO 2016/058907 A1.

Disclosure of Invention

The object of the present invention is to provide a floor cleaning machine of the type mentioned at the outset, which has an optimized coarse dirt pick-up function.

In the floor cleaning machine described at the outset, this object is achieved according to the invention in that at least one cleaning element is arranged on the tank device and in that at least one partial region of the tank device on which the at least one cleaning element is arranged is movable relative to the floor head during cleaning operation.

It has proven to be advantageous if the at least one cleaning element is positioned at a defined fixed distance from the floor surface to be cleaned with respect to the cleaning edge. Even when the diameter of the cleaning roller changes, for example due to wear, or it is possible to adapt to manufacturing tolerances in the cleaning roller or in the support of the cleaning roller, a corresponding fixed distance can be adjusted due to the movable arrangement of the tank or the partial region of the tank relative to the floor head.

In particular, it is provided that the at least one cleaning element and the tank device are configured such that the at least one cleaning element is at a predefined, fixed distance from the floor surface to be cleaned during the cleaning operation. It has proved that if the fixed distance is too small, at least one cleaning element can become caught or stuck at the joint or transition at the floor surface to be cleaned. If this distance is too great, dirt particles will pass over and cannot be picked up. By adjusting the defined fixed distance, an optimized operating mode for the operator is obtained, wherein on the one hand, jamming or the like at floor irregularities, such as joints, is reduced, and on the other hand, an optimized cleaning result with respect to coarse dirt is also obtained.

It has been found that the defined distance, in particular with respect to the distance of the sweeping edge from the ground, is greater than zero, and in particular greater than 0.5mm, and in particular greater than 0.7mm, and in particular about 1mm. The defined distance is in particular the height distance between the cleaning edge of the at least one cleaning element and the ground. Whereby it is possible to prevent jamming at uneven ground in an effective manner.

It has furthermore proved to be advantageous if the defined distance is less than 1.5mm, and in particular less than 1.3mm, and in particular approximately 1mm. An optimized cleaning result with respect to coarse dirt is thus obtained. The respective particles can be collected via at least one cleaning element, transported to and carried by at least one cleaning roller.

In an advantageous embodiment, at least one cleaning element is arranged on the bottom or on a side wall of the tank arrangement. In this way, the at least one cleaning element can be positioned in a simple manner relative to the associated at least one cleaning roller.

More particularly advantageously, at least one support element for the floor surface to be cleaned is arranged on the at least one cleaning element and/or the tank device, which support element holds the at least one cleaning element in a defined fixed distance from the floor surface to be cleaned. At least one support element is in contact with the floor surface to be cleaned.

Thereby obtaining an optimized cleaning result and providing a simple operability for the user. The defined distance is fixedly adjusted (adjusted to be fixed) even in the case of different diameters of the at least one cleaning roller, due to the mobility of the tank arrangement or of the partial region of the tank arrangement on which the at least one cleaning element is arranged relative to the floor head.

Advantageously, at least one of the following features is provided:

the at least one support element is configured as a raised rib on the at least one cleaning element and/or the tank arrangement;

-being provided with a plurality of support elements;

-there is a free area between adjacent support elements, which is not in contact with the floor surface to be cleaned;

the support elements are arranged in rows, wherein in particular the longitudinal direction of the row is at least approximately parallel to the axis of rotation of the at least one cleaning roller;

the at least one support element is configured as a sliding element or rolling element for the floor surface to be cleaned.

A fixed distance of the at least one cleaning element from the floor surface to be cleaned is provided by one or more support elements. This results in an easy operability of the floor cleaning machine while having an optimized cleaning effect even for coarse dirt particles. The at least one support element can slide on or roll over the floor to be cleaned. An optimized positioning of the at least one cleaning element is achieved by means of a plurality of support elements. Friction with respect to the floor to be cleaned is minimized or the influence of the support elements on the floor to be cleaned is minimized by the free space between adjacent support elements. A simple design is achieved by arranging the cleaning elements in rows, for example, on at least one cleaning element.

It is more particularly advantageous if the tank device or a partial region of the tank device on which the at least one cleaning element is arranged is supported in a floating manner on the tank device holder of the floor head. In this way, a defined, fixed distance of the cleaning edge of the at least one cleaning element from the floor surface to be cleaned is always achieved even in the case of different diameters of the at least one cleaning roller (for example due to wear or manufacturing tolerances).

In a structurally simple embodiment, the tank device or a partial region of the tank device on which the at least one cleaning element is arranged is suspended on the floor head. In this way, the tank device or the partial region of the tank device can be movable in a simple manner, while also realizing a corresponding floating support, in order to adjust again the defined fixed distance of the cleaning edge of the cleaning element from the ground.

It is more particularly advantageous if the tank arrangement or a partial region of the tank arrangement on which the at least one cleaning element is arranged is mounted on the floor head in a manner movable at least in the z-direction and has at least one of the following features:

the z-direction is transverse and in particular perpendicular to the axis of rotation of the at least one scrub roller;

the z-direction is transverse and in particular at least approximately perpendicular to a bracing plane of the at least one cleaning roller for the floor to be cleaned;

The z-direction is oriented at least substantially parallel to a removal direction of the tank arrangement from the floor head.

In this way, a fixed distance of the cleaning edge of the cleaning element from the floor surface to be cleaned can be set in a simple manner during the cleaning operation.

It is possible here for the tank arrangement or a partial region of the tank arrangement on which the at least one cleaning element is arranged to be mounted on the floor head in a manner movable in at least one direction transverse to the z-direction. Thus additional tolerance compensation is obtained.

In particular, it is provided that the at least one cleaning element is arranged and configured such that the at least one cleaning element conveys dirt particles to the at least one cleaning roller, wherein the dirt particles are carried by the at least one cleaning roller as a result of the rotation of the at least one cleaning roller. The at least one cleaning element collects dirt particles to a certain extent and makes them "available to" the at least one cleaning roller, wherein the at least one cleaning roller then conveys the dirt particles again so that the dirt particles can be finally conveyed to the tank arrangement.

In an advantageous embodiment, the tank device is configured as a tank device for a dirt fluid. The tank device is especially adjacent to at least one cleaning roller. The dirt fluid (possibly including coarse dirt particles) may then be transported directly from the at least one cleaning roller into the tank arrangement. In particular, the transport may be performed without a fan.

In an advantageous embodiment, at least one transfer channel is provided for the dirt fluid from the at least one cleaning roller to the receiving space of the tank device. The dirt fluid can thus be separated from the at least one cleaning roller in a short flow path in an efficient manner and coupled into the tank arrangement.

Advantageously, a sealing device is provided which is arranged on the tank device or a partial region of the tank device on which the at least one cleaning element is arranged and which seals the at least one conveying channel against the coupling element for the at least one conveying channel, irrespective of the positioning of the tank device or of the partial region of the tank device. In this way, a fluid-tight transfer to the receiving space of the tank device can be achieved even if the tank device is movable or if a partial region of the tank device is movable (in particular movable relative to the coupling element).

In particular, the coupling-in element is arranged on the floor head and has at least one of the following features:

the sealing device is configured to be movable and/or to be elastic;

-at least one scraping element for at least one cleaning roller is arranged on the coupling-in element;

In a cleaning operation, the tank device or a partial region of the tank device on which the at least one cleaning element is arranged can be moved relative to the coupling element.

In particular, the dirt fluid can thus be separated from the cleaning roller in an optimized manner. The at least one fluid-tight delivery channel for delivering the dirt fluid into the receiving space of the tank arrangement can be realized in a simple manner. The tank arrangement can be realized in a movable manner so as to bring about a fixed distance of the sweeping edge from the floor to be cleaned, irrespective of the diameter of the at least one cleaning roller.

In a structurally simple embodiment, the tank device or a part-region of the tank device on which the at least one cleaning element is arranged is driven under force and in particular under force of gravity or is pressed against the floor to be cleaned, for example by means of a spring device, in the direction of the support plane of the at least one cleaning roller. The positioning of the tank arrangement can thus be adjusted in a simple manner itself in order to obtain a fixed distance of the cleaning edge of the cleaning element from the floor to be cleaned, irrespective of the diameter of the at least one cleaning roller.

In an advantageous embodiment, a scraper device is provided for scraping dirt fluid from the at least one cleaning roller and for coupling the dirt fluid into the tank device. At least one of the cleaning rollers can be wrung out to some extent by the scraper device, so that dirt fluid can be discharged from the cleaning roller.

In an advantageous embodiment, at least one cleaning roller has a fabric facing, such as a microfiber facing, and in particular the scraper of the scraper device dips into the fabric facing. An optimized separation of the dirt fluid from the at least one cleaning roller is thereby obtained.

In one embodiment, at least one cleaning roller is formed in two parts and is provided with an intermediate drive. Thereby enabling near-edge cleaning. The at least one scrub roller can be configured and positioned such that it reaches a lateral end of the floor head.

Advantageously, tank means for the cleaning liquid and conveying means for conveying the cleaning liquid from the tank means to the at least one cleaning roller and/or to the floor to be cleaned are provided. An improved cleaning effect is obtained based on the wiping effect. Dirt on the surface to be cleaned can be partially dissolved by the cleaning liquid, in particular clear water or clear water containing, for example, a surface-active cleaning agent additive. At least one cleaning roller mechanically acts upon the soil as a result of its rotation.

Advantageously, a pin strip with pins for picking up hairs is provided, wherein in particular the pins rest on the fabric facing or sink into the fabric facing of the at least one cleaning roller. So that hairs can be picked up and collected from the floor surface to be cleaned. An optimized cleaning effect is obtained.

Advantageously, the at least one sweeping element is connected upstream of the scraper for the at least one cleaning roller with respect to the normal direction of rotation of the at least one cleaning roller during the cleaning operation. The dirt particles collected by the at least one cleaning element can thus be carried by the at least one cleaning roller and carried away from the cleaning element. These dirt particles then reach the scraper, where they can separate out the dirt fluid (including the dirt particles).

In one embodiment, a first cleaning roller and a second cleaning roller are provided, the second cleaning roller being arranged on the floor head, in particular spaced apart from the first cleaning roller, and having at least one of the following features:

-the first axis of rotation of the first cleaning roller and the second axis of rotation of the second cleaning roller are oriented parallel to each other;

in a normal operating mode of the floor cleaning machine, the first cleaning roller and the second cleaning roller rotate counter to each other.

Thus, an optimized cleaning result is obtained. In particular, the tank device is arranged between the first cleaning roller and the second cleaning roller. Thereby allowing at least the cleaning roller to be positioned "steadily".

In particular, a first cleaning element and/or a second cleaning element is assigned to the first cleaning roller and/or to the second cleaning roller. The first cleaning element and the second cleaning element are advantageously arranged on the same tank device.

In one embodiment, the floor cleaning machine is hand-held and hand-guided. A holding device for the operator is provided, which is arranged on the floor head (and in particular in a swingable manner), wherein the floor cleaning machine can be operated by a standing operator.

In an alternative embodiment, the floor cleaning machine is configured as a self-propelled and self-steering machine, and in particular as a wiping robot.

According to the invention, a method for operating a floor cleaning machine is provided, in which a cleaning roller is arranged on a floor head and coarse dirt is fed to the rotating cleaning roller via a sweeping element, in which the sweeping element is arranged on a tank arrangement, and the tank arrangement or a partial region of the tank arrangement on which the sweeping element is arranged is movable relative to the floor head during a cleaning operation, and in which the sweeping element is at a defined fixed distance from the floor surface during the cleaning operation.

The method according to the invention has the already explained advantages in connection with the floor cleaning machine according to the invention.

In particular, the method according to the invention can be performed on the floor cleaning machine according to the invention, or the floor cleaning machine according to the invention can be operated with the method according to the invention.

It is more particularly advantageous if the cleaning element is supported on the floor surface to be cleaned (during cleaning operation) via at least one support element, wherein the at least one support element is arranged on the cleaning element and/or the tank arrangement. In this way, a defined, fixed distance of the cleaning edge of the cleaning element from the floor surface to be cleaned can be achieved in a simple manner. The defined distance remains unchanged even when the diameter of at least one cleaning roller changes, for example due to wear, or there are manufacturing tolerances with respect to the cleaning roller.

Drawings

The following description of the preferred embodiments is used to explain the present invention in more detail in conjunction with the figures. Wherein:

fig. 1 shows a partial view of an embodiment of a floor cleaning machine according to the invention, wherein the holding (bar) arrangement is shown in the partial view and only one piece is shown in the two-piece (front) cleaning roller;

FIG. 2 shows a side view of the floor cleaning machine according to FIG. 1;

fig. 3 shows an enlarged view of the area a according to fig. 2 at the moment of placing the cleaning roller on the floor to be cleaned;

FIG. 4 shows the same view as FIG. 3, with the scrub roller set for a longer time and with its diameter reduced;

FIG. 5 shows a perspective view of an embodiment of a tank arrangement or a partial region of a tank arrangement;

FIG. 6 shows a side view of a tank arrangement or partial area according to FIG. 5;

FIG. 7 shows a cross-sectional view along line 7-7 of FIG. 6;

FIG. 8 shows a sectional view of the floor cleaning machine according to FIG. 1 in the region of the front cleaning roller with the pin strip in the first position;

FIG. 9 shows the same view as FIG. 8 with the dowel strip in a second position;

FIG. 10 shows the same view as FIG. 8 with the pin strip in a third position;

FIG. 11 shows a perspective view of an embodiment of a dowel bar;

fig. 12: a further perspective view of the pin strip according to fig. 11 is shown;

fig. 13: a further perspective view of the pin strip according to fig. 11 is shown;

FIG. 14 shows a side view of the dowel bar according to FIG. 11;

FIG. 15 shows a front view of the dowel bar according to FIG. 11;

FIG. 16 shows a further embodiment of a floor cleaning machine according to the invention (in the form of a self-propelled and self-steering floor cleaning machine); and is also provided with

Fig. 17 shows a further embodiment of a hand-held and hand-guided floor cleaning machine.

Detailed Description

An exemplary embodiment of a floor cleaning machine according to the invention, which is shown in partial figures in fig. 1 and 2 and is designated by 10, is designed as a hand-held and hand-guided floor cleaning machine which can be operated by a standing operator.

The floor cleaning machine 10 includes a floor head 12. At least one scrub roller 14 is disposed on the floor head 12. In the illustrated embodiment, a first cleaning roller 14a and a second cleaning roller 14b are rotatably supported on the floor head 12. The first cleaning roller 14a and the second cleaning roller 14b are spaced apart and are oriented parallel to one another.

The first cleaning roller 14a is rotatable about a first rotational axis 16 a. The second cleaning roller 14b is rotatable about a second axis of rotation 16 b. The first rotational axis 16a and the second rotational axis 16b are parallel to each other.

A first shaft 18 is disposed on the floor head 12 for the first cleaning roller 14 a. A second shaft (not visible in the figures) is assigned to the second cleaning roller 14b. The first shaft 18 and the second shaft are connected to a drive motor via a transmission, respectively. The drive motor is mounted in particular on the floor head 12.

It is provided here that the first cleaning roller 14a and the second cleaning roller 14b run counter to one another, and in particular at the same rotational speed, at least for the normal operating mode of the floor cleaning machine 10.

For an embodiment of the drive motor and transmission reference is made to the non-previously published german patent application No. 10 2019 109 946.3 by the same applicant 2019, 4, 15. Reference is made to the entire content of this document.

In one embodiment, the first cleaning roller 14a and the second cleaning roller 14b are each formed in two parts. The first shaft 18 includes a first shaft region 20 and a second shaft region 22. A corresponding first portion, such as first portion 24 of first scrub roller 14a, is disposed on first shaft region 20. The second portion of the first cleaning roller 14a is not shown in fig. 1 and 2. The second portion 26 of the second scrub roller 14b is visible there.

A center drive is provided for the rotational drive of the first cleaning roller 14a and the second cleaning roller 14 b. The torque-efficient coupling of the drive motor to the cleaning rollers 14a and 14b occurs in the central region between the outer ends. In particular, the first cleaning roller 14a and the second cleaning roller 14b extend up to the side edge 28 of the floor head 12, thereby enabling edge-near cleaning.

Reference is made in this respect by way of example to DE 10 2019 109 946.

In one embodiment, the scrub roller 14 includes a fabric facing 30 that is disposed on a corresponding cylindrical holder 32.

In a cleaning operation of the floor cleaning machine 10, the floor head 12 is supported via the first cleaning roller 14a and the second cleaning roller 14b on the floor 34 (fig. 2) to be cleaned. The floor head 12 has with its cleaning rollers 14a, 14b a bracing plane 36 for the floor 34. The floor 34 to be cleaned is in particular a hard floor.

The floor cleaning machine 10 comprises a holding device 38, which is in particular configured as a holding bar arrangement (only a part of which is shown in fig. 1 and 2). The holding device 38 is pivotably articulated to the floor head 12 via a pivot joint 40. The pivot axis 42 of the holding device 38, which is pivotable relative to the floor head 12, is oriented in particular parallel to the first pivot axis 16a or the second pivot axis 16 b.

There may also be additional swingable about a swing axis 44 which is locked transversely to the swing axis 42. The pivot axis 42 is in particular parallel to the bracing plane 36.

The floor cleaning machine 10 is hand guided. The holding device 38 is configured such that an operator can guide the floor cleaning machine 10 over the floor 34 to be cleaned, wherein the floor head 12 is supported on the floor 34 via the cleaning rollers 14a, 14b and the operator stands on the floor 34 at a distance from the floor head 12 itself; the hand guided floor cleaning machine 10 is in particular constructed such that it can be operated by a standing operator. Reference is made in this respect to DE 10 2019 109 946.

A tank device 46 is detachably arranged on the floor head 12. The tank assembly 46 is removably positioned on a tank assembly holder 48 of the floor head 12. The tank assembly 46 is detachable in a removal direction 50 (fig. 1) downwardly away from the floor head 12.

The removal direction 50 is oriented in particular perpendicularly to the bracing plane 36.

The canister device 46 is positioned on the holder 48 between the first cleaning roller 14a and the second cleaning roller 14 b. The tank arrangement 46 is adapted to contain dirt fluid which is "extracted" from the cleaning rollers 14a, 14b and fed to the tank arrangement 46.

In the embodiment shown, a single tank device 46 is provided for the first cleaning roller 14a and the second cleaning roller 14 b.

In principle, it is also possible to assign the first cleaning roller 14a and the second cleaning roller 14b to their respective cans, so that the can device comprises two separate or connected parts.

The tank arrangement 46 is in particular arranged such that dirt fluid from the cleaning roller 14 can be directly coupled in without the need for a fan (without the need for suction). This will be explained in detail below.

The tank arrangement 46 (see also fig. 5 to 7) comprises a bottom tank 52 with (at least one) accommodation space 54 for dirt fluid. The bottom groove 52 has a bottom 56 on which a surrounding wall 58 is arranged. The receiving space 54 is formed between the bottom 56 and the wall 58.

In one embodiment, bottom groove 52 has an exterior shape that is at least approximately cubic.

The canister device 46 includes a cover 60. The cover 60 (fig. 7) may be a separate element from the floor head 12. In particular, the canister device 46, along with the cover 62, is removable from the canister retainer 48.

In an alternative embodiment, the cover of the tank device 46 is formed on the floor head 12, for example by a tank device holder 48. In this embodiment, only the bottom slot 52 can be removed from the floor head 12, while the corresponding cover remains on the floor head 12.

In a cleaning operation of the floor cleaning machine 10, the underside of the bottom 56 of the tank arrangement 46 is oriented toward the floor 34 to be cleaned. The first side wall 62 of the wall 58 faces the first cleaning roller 14a, and the second side wall 64 opposite the first side wall 62 of the wall 58 faces the second cleaning roller 14b.

In one embodiment, the first and second sidewalls 62, 64 each have a recess 66 that is used to partially house a transmission via which a respective shaft (e.g., the first shaft 18) is effectively coupled with the drive motor torque. The recess 66 is disposed intermediate the respective side walls 62, 64.

In one embodiment, a securing element 68 is disposed on the bottom slot 52. These fastening elements are in particular dome-shaped. The fastening element 68 is used to fasten the tank arrangement 46 to the tank arrangement holder 48 via the bottom channel 52 (see fig. 7), and in particular to fasten the bottom channel 52 in a suspended manner and to support it in a floating manner on the floor head 12 (see fig. 7). This will be explained in more detail below.

The fastening element 68 is also used in particular for centering and, if provided with a separate cover 60, for additionally fastening such a cover 60 to the base groove 52. The cover 60 then has a corresponding recess 74 (fig. 7) through which the securing element 68 is countersunk.

A first cleaning element 70 is arranged on the floor head 12, which is associated with the first cleaning roller 14a. Furthermore, a second cleaning element 72 is arranged on the floor head 12, which is associated with the second cleaning roller 14b. The cleaning elements 70, 72 are used to collect dirt particles (in particular coarse dirt particles) and to convey the dirt particles to the respectively associated cleaning roller 14a or 14b. These dirt particles can then be carried by the cleaning roller 14a or 14b and can be coupled into the tank device 46.

The first cleaning element 70 and the second cleaning element 72 each have a cleaning edge 76. The sweeping edge 76 is adjacent to the fabric facing 30 of the respective cleaning roller 14 and can rest on it or sink into it. Reference is made in this respect to WO 2016/058956 A1 which is explicitly mentioned.

The respective cleaning element 70, 72 and its cleaning edge 76 extend in particular approximately over the entire length of the associated cleaning roller 14. The sweeping edge 76 is oriented parallel to the respective axis of rotation 16a, 16 b.

The first cleaning element 70 is arranged on the first side wall 62 spaced apart from the bottom 56 of the bottom tank 52. Accordingly, a second cleaning element 72 is disposed on the second sidewall 64 spaced apart from the bottom 56.

It is possible that the respective cleaning elements 70, 72 are formed of a rigid material or have some inherent elasticity.

The cleaning elements 70, 72 have a contour which matches the cleaning rollers 14a, 14b, in particular toward the respective cleaning roller 14a, 14 b.

The first cleaning element 70 and the second cleaning element 72 are arranged on the base trough 52 and here on the respective side wall 62 or 64 (front side wall and rear side wall).

In principle, it is also possible, with a corresponding design of the bottom groove 52, for the first cleaning element 70 and/or the second cleaning element 72 to be arranged on the bottom 56.

The first cleaning element 70 and the second cleaning element 72 are each firmly connected to the sole tank 52 such that they can be removed from the floor head 12 together with the sole tank 52 and moved together with the sole tank 52 being movable towards the floor head 12.

It is provided that, during operation of the floor cleaning machine 10, the respective cleaning edges 76 of the first cleaning element 70 and of the second cleaning element 72 are held at a defined fixed distance D from the floor 34 to be cleaned (see fig. 3 and 4). The defined distance D is independent of the diameter of the associated cleaning roller 14 and thus of the wear of the fabric surface 30. The defined distance is also independent of manufacturing tolerances.

The distance D is predetermined in order to obtain an optimum cleaning effect with respect to the coarse dirt collecting function of the cleaning elements 70, 72. If the distance D is too small, the respective cleaning element 70 or 72 may become stuck at the seam, transition or the like at the floor 34 to be cleaned and result in more difficult operability. If the distance D is too large, the coarse dirt collecting function is deteriorated.

In particular, the distance D is greater than zero and preferably greater than 0.5mm and preferably greater than 0.7mm. Furthermore, it is provided in particular that the defined distance D is less than 1.5mm and in particular less than 1.3mm.

In a preferred embodiment, the distance D is about 1mm.

In order to provide this defined distance D during a cleaning operation of the floor cleaning machine 10, a support element 78 (fig. 3, 4) is provided, with which the first cleaning element 70 or the second cleaning element 72 is supported on the floor 34 to be cleaned. The support element 78 is configured as a sliding element that slides over the floor 34 during a cleaning operation of the floor cleaning machine 10.

The support element 78 is configured such that the sweeping edge 76 is located at a distance D from the ground 34.

In one embodiment, the support members 78 are formed of spaced apart raised ribs 80 disposed on the respective cleaning elements 70, 72. These projecting ribs 80 extend beyond the sweeping edge 76 in the direction of the bracing plane 36 in order to perform a supporting function on the floor 34.

Between adjacent support elements 78 or raised ribs 80, there is a free space via which the respective cleaning element 70, 72 does not contact the floor 34.

In particular, a row of support elements 78, in particular in the form of raised ribs, is provided on the respective cleaning element 70, 72. The respective row has a longitudinal direction which is parallel to the respective axis of rotation 16a, 16b of the associated cleaning roller 14a or 14 b.

Alternatively or additionally, it is possible for the support element 78 to be arranged on the tank arrangement 46 and in this case on the bottom 56 of the bottom tank 52.

In operation of the floor cleaning machine 10, the tank 46 is supported on the floor 34 to be cleaned via the support element 78. In order to maintain the distance D independently of the specific case of the cleaning roller 14, the tank 46 or a partial region of the tank (bottom trough 52) is supported in a floating manner on the floor head 12 and in this case on the tank holder 48. The tank arrangement 46 has a mobility in the z-direction 82 with respect to the partial region in which the cleaning elements 70, 72 are arranged. The z-direction 82 is transverse and in particular perpendicular to the support plane 36 of the cleaning roller 14 on the floor 34.

The z-direction 82 is furthermore oriented transversely to the rotational axes 16a, 16b, and in particular perpendicularly thereto.

It is furthermore preferred that the z-direction 82 is oriented transversely and in particular perpendicularly to the pivot axis 42.

Because of the mobility of base groove 52 and sweeping elements 70, 72 in z-direction 82 and because of the correspondingly floating support on floor head 11, sweeping edge 76 is always at a fixed distance D from floor 34, regardless of the particular diameter of cleaning roller 14. This fixed distance D of the sweeping edge 76 from the floor 34 is automatically set during the cleaning operation due to the mobility of the base trough 52 in the z-direction 82. The support members 78 ensure "proper" positioning of the cleaning elements 70, 72 with the floor 34.

In one embodiment, the mobility of tank assembly 46 or the partial area (bottom tank 52) in which cleaning elements 70, 72 are disposed is achieved by suspension support of bottom tank 52 on floor head 12. In particular, the support can be adjusted by this fixed distance D on the one hand, and the sole groove 52 does not fall off when the floor head 12 is lifted from the floor 34 on the other hand.

For example, for this purpose, the fastening element 68 is assigned a corresponding mating fastening element on the tank device holder 48, which can achieve a movability in the z-direction 82 and prevent falling out. In particular, a disassembly force and/or a special disassembly movement is required in order to remove the tank device 46 from the floor head 12 in the removal direction 50.

In particular, the movability in the z-direction 82 is also adjusted such that compensation with respect to the fixed distance D can just be achieved without the tank arrangement 46 being mounted "too loosely" on the floor head 12.

In one embodiment, for example, tabs are each provided on adjacent fastening elements 68, which are positioned in corresponding receptacles of tank assembly holder 48 and can be moved in z-direction 82 when tank assembly 46 is fastened to floor head 12, wherein the mobility is limited to a corresponding travel distance and the release of tank assembly 46 from tank assembly holder 48 is prevented without additional measures.

It is in principle possible here for the tank arrangement 46 as a whole with the cover 60 to be movable in the z-direction 82 relative to the floor head 12, or for example for the bottom trough 52 to be movable in the z-direction 82 relative to the cover 60 or the cover formed by the tank arrangement holder 48.

It is additionally possible for the tank device 46 or a partial region of the tank device 46 on which the cleaning elements 70, 72 are mounted to be movable in at least one transverse direction 84a, 84b (see fig. 5) transversely to the z-direction 82 and to be supported in a floating manner on the tank device holder 48.

The floor cleaning machine 10 includes a tank arrangement 86 (fig. 1) for cleaning liquid. The tank means 86 for cleaning liquid contains cleaning liquid which can be fed directly or indirectly via the feed means 88 to the floor 34 to be cleaned.

Cleaning fluids, in particular clear water, can be added with a detergent additive and in particular with a surface-active detergent additive. It is also possible in principle for the tank arrangement 86 to have separate tanks for the fresh water and the cleaning agent additive and to mix accordingly.

In one embodiment, the cleaning liquid is delivered to the respective cleaning rollers 14 via a delivery device 88; the fabric facing 30 of the respective cleaning roller 14 is then wetted via the cleaning liquid.

Dirt on the floor 34 may be loosened by the cleaning liquid. Additionally, the dirt is mechanically influenced via the respective cleaning roller 14. The cleaning roller 14 performs a rotary wiping motion on the floor 34.

In one embodiment, canister device 86 is disposed on retaining device 38. It is also possible in principle for it to be arranged on the floor head 12.

Reference is made in this case for example to WO 2017/15345 A1 or DE 10 2019 109 946.

Furthermore, reference is made for example to WO 2016/058901 A1. For example, in a cleaning operation of the floor cleaning machine 10, the transfer of cleaning agent from the tank 86 to the cleaning roller 14 via the transfer device 88 is automatically caused by corresponding opening of a valve or switching of a pump as the cleaning roller 14 rotates.

A scraper device 90 (see fig. 8) is arranged on the floor head 12 in each case associated with a cleaning roller 14. The scraper device 90 comprises a scraper 92 which dips into the fabric facing 30 of the associated cleaning roller 14a, 14 b. The dirt fluid can be separated from the associated cleaning roller 14 by the respective scraper 92 and can be conveyed into the tank arrangement 46. Reference is made in this respect to WO 2019/086083 A1.

For this purpose, a (at least one) conveying channel 94 is provided, which opens into the receiving space 54.

In one embodiment, the scraper 92 is arranged on the coupling element 96. An opening 97 for the feed channel 94 is arranged on the coupling element 96. The scraper 92 forms an opening wall for the opening 97. In particular, the tank device 46 or a partial region on which the cleaning elements 70, 72 are arranged can be moved relative to the coupling element 96 in the z-direction 82.

In order to be able to achieve this mobility and to obtain a sealed delivery channel 94 at the tank device 46, sealing means 98 are provided which seal the delivery channel 94 with respect to the coupling element 96 in order to obtain a fluid-tight delivery channel 94 when the tank device 46 is positioned differently with respect to the coupling element 96 in the z-direction.

The wiper 92 is positioned spaced apart from the respective sweeping element 70, 72.

In one embodiment, it is provided that the respective cleaning roller 14 rotates in a rotational direction 100 such that the scraper 92 is located behind the respective sweeping element 70 or 72. Coarse dirt picked up by the respective cleaning element 70, 72 can thereby be transported by the respective cleaning roller 14 to the scraper 92. At the scraper 92, the dirt fluid is separated off and conveyed into the accommodation space 54 via at least one conveying channel 94.

For example, it is possible for the coupling element 96 and/or the conveying channel 94 to be arranged on the cover 60 of the tank device 46. Reference is made in this respect to WO 2019/029821 A1.

It is particularly advantageous if the base groove 52 can be moved relative to the cover 60, so that a movability in the z-direction 82 can be achieved, in order, in turn, to be able to adjust the fixed distance D from the sweeping edge 76 to the floor 34.

Regarding the floatingly supported tank arrangement 46, the floor cleaning machine 10 works as follows:

in the cleaning operation of the floor cleaning machine 10, the floor cleaning machine is placed via the cleaning rollers 14a, 14b onto the floor 34 to be cleaned and is moved over the floor 34.

The cleaning rollers 14a, 14b are loaded with cleaning liquid from the tank device 86. The cleaning rollers 14a, 14b rotate in the direction of rotation 100 and in particular they counter-rotate to each other.

The fabric facing 30 is wetted. The cleaning rollers 14a, 14b act with corresponding facing areas on the floor 34 to be cleaned, mechanically influence and wet dirt in order to improve its separation.

Coarse dirt is collected via the cleaning elements 70, 72, which coarse dirt can be carried along in the direction of rotation 100 by the respective cleaning roller 14a, 14 b.

Dirt fluids, including coarse dirt, may be separated from the cleaning roller 14 at the respective scraper 92 and then transported into the tank arrangement 46 and into the respective receiving space 54.

The cleaning elements 70, 72 are arranged on the base trough 52 and thus on the tank arrangement 46 or on a partial region of the tank arrangement 46. The base tank 52 with the cleaning elements 70, 72 is supported on the floor head 12 in a floating manner in the z-direction 82. During a cleaning operation, the sole trough 52 is supported on the floor 34 to be cleaned via the support elements 78. In this case, a defined distance D between the sweeping edge 76 and the floor 34 is automatically set.

This automatic adjustment is carried out with different facing thicknesses B (see fig. 3 and 4) of the respective cleaning rollers 14a, 14B. The facing thickness B may vary, for example, in the event of corresponding wear of the cleaning roller 14, or may also vary due to manufacturing tolerances.

For example, the fabric facing 30 is compressed more at the placement area on the floor 34 to be cleaned than at other areas (see FIGS. 3 and 4). When the tank 46 is full, the width B may be smaller than when the tank is empty.

The floating support of tank assembly 46 or bottom trough 52 may enable the movability of bottom trough 52 in z-direction 82 relative to the rotational axis 16a or 16b of the respective scrub roller 14. In contrast to fig. 3 and 4, the bottom slot 52 occupies a different position relative to the axis of rotation 16 a.

As mentioned, a fixed distance D is thus always obtained between the sweeping edge 76 and the floor 34, irrespective of the situation on the cleaning roller 14. This again results in an optimized coarse-grain dirt collection function for the respective cleaning element 70, 72. On the one hand, jamming on the floor 34 and, on the other hand, larger particles "slip" under the respective cleaning element 70, 72 are thereby prevented.

The corresponding function is independent of manufacturing tolerances and is ensured over the service life of the cleaning roller 14 as the fabric facing 30 wears (as the diameter of the cleaning roller 14 decreases).

In one embodiment, the tank device 46 or the bottom trough 52 is supported on the floor head 12 in such a way that it is pressed against the floor 34 in a gravity-driven manner, so that the support element 78 rests on the floor 34. The self-weight of bottom slot 52 causes sweeping edge 76 to automatically be positioned a fixed distance D from ground 32.

Alternatively or additionally, it is possible for the spring device 102 to press the bottom groove 52 in the direction 104 of the bracing plane 36 (see fig. 3). The spring device 102 is supported here in particular on the tank device holder 48 and the bottom groove 52 in order to correspondingly press the support element 78 against the ground 34.

A pin strip 106 having a plurality of pins 108 is disposed on the floor head 12. The pins 108 of the pin strip 106 rest on the fabric facing 30 or extend into the fabric facing 30 of the associated cleaning roller 14a, 14 b.

The pin strip 106 is used to pick up hair in the manner of a hairbrush.

The pin 108 is made in particular of plastic material.

The dowel bar 106 is arranged on the floor head 12 such that it can be removed as a whole by an operator. The operator may then clean the pin strip 106 with hair entangled therein.

The pin strip 106 comprises a carrier 110 on which the pins 108 are arranged. The pin 108 here extends beyond the carrier 110.

The pin 108 extends in a pin direction 114. The pin has a flat end side 116. In particular, the diameter of the pin 108 at the end side 116 is between 0.1mm and 0.5 mm. In one embodiment, this diameter at the end side 116 is approximately 0.3mm.

In one embodiment, the dowel bar 106 is formed on the coupling-in element 118. The coupling-in element 118 is positioned on the floor head 12. The coupling element 118 can be removed from the floor head 12 as a whole, or the dowel strip 106 can be removed from the coupling element 118.

The coupling-in element 118 comprises a holder 120. The carrier 110 with the pin strips 106 of the pins 108 is mounted firmly or detachably (see above) on the holder 120.

Furthermore, a scraper 92 is arranged on the holder 120 of the coupling element 118 at a distance from the pin 108.

In one embodiment, an opening 97 is also at least partially formed in the coupling-in element 118.

The pins 108 of the first and second rows 122a, 122b are arranged on the carrier 110, which is in particular firmly mounted on the holder 120.

The first and second rows 122a, 122b extend along a longitudinal direction 124 (fig. 11). In particular, the end sides 116 of the pins 108 of a row 122a or 122b lie on a line parallel to the longitudinal direction 124.

With the dowel bar 106 positioned on the floor head 12, the longitudinal direction 124 is parallel to the respective first axis of rotation 16a for the first scrub roller 14a or the second axis of rotation 16b for the second scrub roller 14 b.

The longitudinal direction 124 is also at least generally parallel to the bracketing plane 36.

The second row 122b is spaced apart from the first row 122a in the lateral direction 126.

In the illustrated embodiment, the pins 108 in the first and second rows 122a, 122b are each in a line.

In principle, it is also possible for the pins to be offset within a row in the transverse direction 126.

In particular, the rows 122a, 122b have a length which substantially corresponds to the length of the associated cleaning roller 14a, 14b or is somewhat shorter. Thereby ensuring that brush pick-up occurs substantially over the entire length of the corresponding scrub roller 14.

Coupling elements 128 and, in particular, latching elements are arranged on the holder 120 and, in particular, on the carrier 110, by means of which the pin strip 106 can be connected to corresponding counter elements on the floor head 12 and, in particular, can be latched. The coupling elements 128 and their mating elements are designed such that the operator can detach the pin strip 106 or the coupling elements 128 and can be inserted again in a simple manner, in particular for cleaning purposes.

During operation of the floor cleaning machine 10, the pins 108 of the pin strip 106 rest on or sink into the fabric facing 30, see in particular fig. 10.

During operation of the floor cleaning machine 10, the scraper 92 is at a depth T ₁ (fig. 10) sunk into the fabric facing 30 of the corresponding scrub roller 14. The corresponding penetration depth of pin 108 is T ₂ 。

Depth of penetration T ₂ Between 0mm (inclusive) and 4mm (inclusive), wherein a penetration depth of 0mm means that the pin 108 rests with the end side 112 against the fabric facing 30.

In particular, it is provided that the pin 108 protrudes to the same or less depth as the wiper 92 (as an opening wall for scraping dirt fluid and being coupled into the tank device 46) into the fabric facing 30.

In particular, difference T ₁ -T ₂ In the range between 0mm (inclusive) and 1mm (inclusive).

On the pin strip 106, the pins 108 and in particular all pins 108 are oriented in a pin direction 114. The pin direction 140 is transverse and in particular perpendicular to the respective axis of rotation 16a or 16b of the associated cleaning roller 14.

Pin direction 140 is also oriented parallel or oblique to z-direction 82. The corresponding angle 130 of the pin direction 114 to the z-direction 82 (and thus also to the normal of the bracketing plane 36) is, for example, in the range between 0 ° and 10 °.

In addition, the pin direction 140 is parallel or at an acute angle 132 (see fig. 10) to the scraper 92. The angle 132 is in particular in the range between 0 ° and 25 °.

Optimized hair pick-up results have been obtained when the pin direction 114 and the scraper 92 are not oriented parallel to each other, but at an acute angle, and in particular at an acute angle of about 20 °.

The pins 108 on the pin strip 106 are arranged like elements on a brush in order to achieve optimal hair pick-up. The pin strip 106 is arranged behind the scraper 92 with respect to the direction of rotation 100. Hairs that are not coupled into the openings 97 can be picked up by the pin strip 106.

The pin strip 106 is also resiliently supported on the floor head 12. Alternatively or additionally, the scraper 92 is stressed and in particular spring-loaded by means of the opening 97 on the floor head 12.

In the exemplary embodiment shown, the coupling element 118 is force-loaded and in particular spring-loaded on the floor head 12. The pin strip 106 and the scraper 92 are thus jointly acted upon by force and are supported, in particular spring-loaded, on the floor head 12.

The coupling element 118 can be moved in the movement axis 134 and is supported in a movable manner on the floor head 12.

The coupling-in element 118 is arranged on the displacement guide 136. The movement axes 134 are oriented transversely to the respective rotation axes 16a and 16 b.

The axis of motion 134 is particularly at an acute angle to the z-direction 82.

The axis of motion 134 is also at an acute angle to the normal to the bracketing plane 36.

The axis of motion 134 is aligned in particular with the central axis of the associated cleaning roller 14.

In one embodiment, the axis of motion 134 is oriented parallel to the scraper 92.

A spring device 138 is associated with the coupling element 118 for force application (see fig. 8). The spring device 138 exerts a spring force which is directed to press the coupling element 118 with the pin strip 106 and the scraper 92 against the fabric facing 30 of the associated cleaning roller 14.

In one embodiment, the coupling-in element 118 includes a rest element 140 having a rest face 142 as a contact face for the fabric facing 30. The abutment surface 142 can abut the fabric facing 30 without penetrating into the fabric facing.

In particular, the pin 108 and scraper 92 extend beyond the abutment surface 142. The abutment elements 140 form stops for the coupling-in elements 118 acting on the respective cleaning roller 14. It is configured such that the pin 108 is at the desired penetration depth T ₂ And the scraper 92 is submerged to a desired depth T ₁ Into the fabric facing 30.

In this case, it is ensured that the corresponding (pre-adjusted) immersion depth T is reached irrespective of the diameter 30 of the corresponding cleaning roller 14 ₁ And immersion depth T ₂ . Regardless of the diameter of the scrub roller 14, the spring device 138 presses the abutment element 140 against the surface of the scrub roller 14.

The depth T provided for optimizing the cleaning effect is maintained even when, for example, the diameter of the cleaning roller 14 is reduced due to the fabric facing 30 being worn away ₁ And T ₂ 。

Corresponding manufacturing tolerances can also be compensated for by the movable support and spring support of the coupling element 118.

Due to the coupling-in elements 118, the distance from the fabric facing 30 remains constant regardless of the state or configuration of the respective cleaning roller 14. An optimized scraping result of dirt fluid and hair is thereby obtained. Depth of penetration T ₁ And T ₂ Regardless of tolerances, roller diameter and wear. An optimized dirt pick-up (including hair pick-up) can thus be ensured. On the one hand, too little intrusion is prevented (which may negatively affect dirt pickup), and on the other hand, too much intrusion is prevented (which may be intendedMeaning that the current consumption of the floor cleaning machine 10 is increased and the motor load and the transmission load are increased).

The spring means 138 may be formed by one or more helical springs. For example, the force loading may also be formed via one or more rubber bumpers. It is also possible, for example, to provide a pressure cylinder, for example, for force application.

In principle, it is also possible for the contact of the contact element 140 on the fabric surface 30 of the associated cleaning roller 14 to be driven solely by gravity.

In the embodiment shown, a coupling element 118 is provided, on which the pin strip 106 and the scraper 92 are arranged.

It is in principle possible to provide the pin strip 106 and the scraper 92 with separate movable and in particular displaceable elements.

It is also possible that either only the pin strip 106 is supported in a movable and in particular movable manner or only the scraper 92 is supported in a movable manner.

Fig. 8 to 10 each show different positions of the coupling-in element 118 on its displacement guide 136 relative to the first cleaning roller 14 a.

The position shown in fig. 8 and 9 is a transitional position to explain the principle of operation.

Fig. 10 shows the final position in which the contact surface 142 contacts the fabric surface 30 from the outside, so that the pin 108 and the scraper 92 each have a predetermined penetration depth T ₁ And T ₂ Into the fabric facing 30.

As described above, it is also possible, for example, for the pin 108 to only contact the fabric lining 30 without penetrating into it (penetration depth T) ₂ 0 mm).

The position shown in fig. 9 is in particular also a position for the coupling element 118, for example when the cleaning roller 14 is to be replaced.

It is possible that the floatingly supported tank described in connection with floor cleaning machine 10 is also used for floor cleaning machine 144 (fig. 16), which is configured to be self-propelled and in particular self-steering. On such floor cleaning machines with floor heads 146, in particular also tank means for cleaning liquid are arranged on the floor heads.

The floating support works in the same way as described above with respect to the tank arrangement for the dirt fluid, on which one or more cleaning elements are arranged.

The floor cleaning machine 144 may also be equipped with one or more dowel bars 106 for hair pick-up.

It is furthermore possible for the respective pin strip 106 and/or the scraper 92 for the respective cleaning roller 14 to be mounted in a movable and in particular displaceable manner and in particular to be loaded under force.

A further embodiment of the floor cleaning machine 148 (fig. 16) includes a floor head 150. In the cleaning operation, the floor head 150 is supported on the floor to be cleaned via a single cleaning roller 152. A removable tank 154 for dirt fluid is mounted on the floor head 150.

The floor head 150 is provided with a pin strip corresponding to the pin strip 106, which is arranged in particular on the tank device 154.

As mentioned above, it is provided in particular that the pin strip 106 and/or the corresponding scraper for the cleaning roller 152 are mounted in a movable and in particular movable manner and in particular spring-loaded manner.

List of reference numerals

10. Floor cleaning machine

12. Floor head

14a first cleaning roller

14b second cleaning roller

16a first axis of rotation

16b second axis of rotation

18. First shaft

20. First axis region

22. Second axis region

24. First part

26. Second part

28. Side edges

30. Fabric facing

32. Retainer

34. Ground surface

36. Supporting plane

38. Holding device

40. Swing joint

42. Swing axis

44. Swing axis

46. Tank device

48. Tank device-holder

50. Direction of removal

52. Bottom groove

54. Accommodation space

56. Bottom part

58. Wall of container

60. Cover for a container

62. Side wall

64. Side wall

66. Concave part

68. Fixing element

70. First cleaning element

72. Second cleaning element

74. Concave part

76. Cleaning edges

78. Support element

80. Raised rib

82 In the z direction

84a, 84b transverse direction

86. Tank device for cleaning liquid

88. Conveying device

90. Scraping device

92. Scraping device

94. Conveying channel

96. Coupling-in element

97. An opening

98. Sealing device

100. Direction of rotation

102. Spring device

104. Direction of

106. Pin lath

108. Pin pin

110. Carrier body

112. End side

114. Pin direction

116. End side

118. Coupling-in element

120. Retainer

122a first row

122b second row

124. Longitudinal direction

126. Transverse direction

128. Coupling element

130. Shaft

132. Shaft

134. Axis of motion

136. Movement guide

138. Spring device

140. Rest element

142. Leaning surface

144. Floor cleaning machine

146. Floor head

148. Floor cleaning machine

150. Floor head

152. Cleaning roller

154. Tank device

D distance from ground 34

T ₁ 、T ₂ Depth of immersion

Claims

1. Floor cleaning machine comprising a floor head (12; 146), at least one cleaning roller (14) arranged on the floor head (12; 146), a tank device (46) arranged on the floor head (12; 146) and at least one sweeping element (70; 72) associated with the at least one cleaning roller (14), characterized in that the at least one sweeping element (70; 72) is arranged at the tank device (46) and that, in a cleaning operation, at least one part region of the tank device (46) in which the at least one sweeping element (70; 72) is arranged is movable relative to the floor head (12; 146) and at least one support element (78) for a floor (34) to be cleaned is arranged on the at least one sweeping element (70; 72) and/or the tank device (46), which support element holds the at least one sweeping element (70; 72) in a defined distance D relative to the floor (34) to be cleaned, wherein the at least one part region of the tank device (46) is supported in the cleaning operation via the cleaning element (78).

2. Floor cleaning machine according to claim 1, characterized in that the defined distance (D) is greater than zero.

3. Floor cleaning machine according to claim 1 or 2, characterized in that the defined distance (D) is less than 1.5mm.

4. Floor cleaning machine according to claim 1 or 2, characterized in that the at least one sweeping element (70; 72) is arranged at the bottom (56) or side wall (62; 64) of the tank arrangement (46).

5. Floor cleaning machine according to claim 1 or 2, characterized by at least one of the following features:

-the at least one support element (78) is configured as a raised rib (80) on the at least one cleaning element (70; 72) and/or the tank device (46);

-provided with a plurality of support elements (78);

-there is a free area between adjacent support elements (78), which is not in contact with the floor (34) to be cleaned;

-the support elements (78) are arranged in rows;

-the at least one support element (78) is configured as a sliding element or rolling element for the floor (34) to be cleaned.

6. Floor cleaning machine according to claim 1 or 2, characterized in that the tank (46) or a partial region of the tank (46) in which the at least one cleaning element (70; 72) is arranged is supported in a floating manner on a tank holder (48) of the floor head (12; 146).

7. Floor cleaning machine according to claim 1 or 2, characterized in that the tank arrangement (46) or a partial region of the tank arrangement (46) in which the at least one cleaning element (70; 72) is arranged is suspended on the floor head (12; 146).

8. Floor cleaning machine according to claim 1 or 2, characterized in that the tank (46) or a partial region of the tank (46) in which the at least one cleaning element (70; 72) is arranged is supported on the floor head (12; 146) in a manner movable at least in the z-direction (82) and has at least one of the following features:

-the z-direction (82) is transverse to the axis of rotation (16 a, 16 b) of the at least one scrub roller (14);

-the z-direction (82) is transverse to a bracing plane (36) of at least one cleaning roller (14 a, 14 b) for a floor (34) to be cleaned;

-the z-direction (82) is oriented at least substantially parallel to a removal direction (50) in which the tank arrangement (46) is removed from the floor head (12; 146).

9. Floor cleaning machine according to claim 8, characterized in that the tank arrangement (46) or a partial region of the tank arrangement (46) in which the at least one cleaning element (70; 72) is arranged is mounted on the floor head (12; 146) in a manner movable in at least one direction (84 a;84 b) transverse to the z-direction (82).

10. The floor cleaning machine according to claim 1 or 2, characterized in that the at least one sweeping element (70; 72) is arranged and constructed such that it conveys dirt particles to the at least one cleaning roller (14), wherein these dirt particles are carried by the at least one cleaning roller (14) as a result of the rotation of the at least one cleaning roller (14).

11. Floor cleaning machine according to claim 10, characterized in that the tank (46) is configured as a tank for dirt fluid.

12. The floor cleaning machine according to claim 10, characterized by at least one conveying channel (94) for dirt fluid from the at least one cleaning roller (14) to the receiving space (54) of the tank arrangement (46).

13. Floor cleaning machine according to claim 12, characterized by a sealing device (98) which is arranged on the tank device (46) or a partial region of the tank device (46) in which the at least one cleaning element (70; 72) is arranged and which seals the at least one conveying channel (94) against a coupling element (118) for the at least one conveying channel (94) independently of the positioning of the tank device (46) or a partial region of the tank device (46).

14. The floor cleaning machine according to claim 13, characterized in that the coupling element (118) is arranged on the floor head (12; 146).

15. Floor cleaning machine according to claim 1 or 2, characterized in that the tank device (46) or a partial region of the tank device (46) in which the at least one cleaning element (70; 72) is arranged is pressed against the floor (34) to be cleaned by gravity or by means of a spring device (102) in the direction of the bracing plane (36) of the at least one cleaning roller (14 a;14 b).

16. Floor cleaning machine according to claim 1 or 2, characterized by a scraper device (90) for scraping dirt fluid from the at least one cleaning roller (14) and for coupling dirt fluid into the tank device (46).

17. Floor cleaning machine according to claim 1 or 2, characterized in that the at least one cleaning roller (14) has a fabric facing (30).

18. Floor cleaning machine according to claim 1 or 2, characterized in that the at least one cleaning roller (14) is constructed in two parts and is provided with an intermediate drive.

19. Floor cleaning machine according to claim 1 or 2, characterized by a tank device (86) for cleaning liquid and a conveying device (88) for conveying cleaning liquid to the at least one cleaning roller (14) and/or to the floor (34) to be cleaned.

20. Floor cleaning machine according to claim 1 or 2, characterized by a pin slat (106) with pins (108) for picking up hairs.

21. Floor cleaning machine according to claim 1 or 2, characterized in that the at least one sweeping element (70; 72) is connected in front of a scraper (92) for the at least one cleaning roller (14) with respect to the normal direction of rotation (100) of the at least one cleaning roller (14) in cleaning operation.

22. Floor cleaning machine according to claim 1 or 2, characterized by a first cleaning roller (14 a) and a second cleaning roller (14 b) arranged on the floor head (12) spaced apart from the first cleaning roller (14 a).

23. Floor cleaning machine according to claim 22, characterized in that a first cleaning element (70) is assigned to the first cleaning roller (14 a) and/or a second cleaning element (72) is assigned to the second cleaning roller (14 b).

24. Floor cleaning machine according to claim 1 or 2, characterized by a holding device (38) for the operator, which is arranged on the floor head (12).

25. Floor cleaning machine according to claim 1 or 2, characterized by a self-propelled and self-steering construction.

26. The floor cleaning machine according to claim 2, characterized in that the defined distance (D) is the distance of the sweeping edge (76) from the floor (34).

27. Floor cleaning machine according to claim 2, characterized in that the defined distance (D) is greater than 0.5mm.

28. Floor cleaning machine according to claim 2, characterized in that the defined distance (D) is greater than 0.7mm.

29. Floor cleaning machine according to claim 2, characterized in that the defined distance (D) is 1mm.

30. A floor cleaning machine according to claim 3, characterized in that the defined distance (D) is less than 1.3mm.

31. The floor cleaning machine according to claim 5, characterized in that the support elements (78) are arranged in rows and that the longitudinal direction of the rows of support elements (78) is at least substantially parallel to the rotational axis (16 a, 16 b) of the at least one cleaning roller (14).

32. The floor cleaning machine according to claim 8, characterized in that the z-direction (82) is perpendicular to the rotational axis (16 a, 16 b) of the at least one cleaning roller (14).

33. The floor cleaning machine according to claim 8, characterized in that the z-direction (82) is at least approximately perpendicular to a bracing plane (36) of at least one cleaning roller (14 a, 14 b) for the floor (34) to be cleaned.

34. The floor cleaning machine of claim 14, wherein the floor cleaning machine has at least one of the following features:

-the sealing device (98) is configured to be movable and/or to be elastic;

-at least one scraping element for the at least one cleaning roller (14) is arranged on the coupling-in element (118);

-providing an opening (97) for the at least one conveying channel (94) on the coupling-in element (118);

-the at least one scraping element forms an opening wall;

-during a cleaning operation, the tank device (46) or a partial region of the tank device (46) in which the at least one cleaning element (70; 72) is arranged can be moved relative to the coupling element (118).

35. A floor cleaning machine according to claim 17, characterized in that the scrapers (92) of the scraper device (90) sink into the fabric facing (30).

36. The floor cleaning machine according to claim 20, characterized in that the pin (108) is sunk into or is abutted against the fabric facing (30) of the at least one cleaning roller (14).

37. The floor cleaning machine of claim 22, wherein the floor cleaning machine has at least one of the following features:

-a first rotation axis (16 a) of the first cleaning roller (14 a) and a second rotation axis (16 b) of the second cleaning roller (14 b) are oriented parallel to each other;

-in a normal operating mode of the floor cleaning machine, the first cleaning roller (14 a) and the second cleaning roller (14 b) are counter-rotating to each other.

38. The floor cleaning machine of claim 24, wherein the floor cleaning machine is configured to be hand-held or hand-guided.

39. The floor cleaning machine of claim 24, wherein the floor cleaning machine is operable by a standing operator.

40. Method for operating a floor cleaning machine, wherein a cleaning roller (14) and a tank device (46) are arranged on a floor head (12), and coarse dirt is fed to the rotating cleaning roller (14) via a cleaning element (70), wherein the cleaning element (70) is arranged at the tank device (46), and the tank device (46) or a partial region of the tank device (46) in which the cleaning element (70) is arranged is movable relative to the floor head (12) during a cleaning operation, wherein the cleaning element (70) is at a defined fixed distance (D) from the floor (34) during the cleaning operation, and wherein the cleaning element (70) is supported on the floor (34) to be cleaned via at least one support element (78), wherein the at least one support element (78) is arranged on the cleaning element (70) and/or the tank device (46), wherein the partial region is supported on the floor (34) to be cleaned via the support element (78) during the cleaning operation.

41. The method of claim 40, wherein the method is used to operate a floor cleaning machine according to any one of claims 1 to 39.