DE4243235A1 - Attachment for suction cleaner with speed-controlled rotary brush - Google Patents

Abstract

The brush (8) rotates within a forward chamber (4) with its bristles (7) protruding through an opening (5) in the baseplate (11) of the attachment, ahead of its rollers (2). It is driven (9) by an electric motor (10) with a speed regulator (83) responsive to the output from a circuit (81) connected to a touch sensor (17) which can distinguish between carpeted and bare floors (3).The regulator fires the triac (84) in accordance with input signals denoting also armature and field voltages (85a, 85b), motor current (85c, 99), floor clearance (16) and roller movement (18).

Description

The invention relates to a cleaning tool for connection to the suction line of a suction cleaning device after Preamble of claim 1.

Such a Reini, also known as a brush suction nozzle power tool is used both for cleaning smooth, hard Surfaces such as for cleaning textile coverings, in particular whose flooring is used. To achieve an optimal Cleaning has to be done to clean hard, smooth floor surfaces Brush speed of approx. 800 rpm can be set while brushes for cleaning textile floor coverings speed of about 3,600 rpm is advantageous. For setting The brush speed are therefore electrical changeover switches provided that are often operated incorrectly. Therefore it leads to poor cleaning results or too Damage to the flooring or the cleaning plant stuff itself.

The invention has for its object a genus moderate cleaning tool in such a way that without manual actuation of a changeover device to one Brush speed automatically adjusted to the cleaning surface is set.  

The task is inventively according to the characteristic Features of claim 1 solved.

The button sensor is used continuously during work movement of the cleaning tool scanned the floor, where if the coating changes, the push button sensor changes Output signal emits what about the detection circuit too a change in brush speed is exploited. Also un Experienced people are therefore free from the risk of damage possible to achieve an optimal cleaning result.

In a first embodiment of the invention, the button is sor as a reflection light directed against the floor barrier formed, the different reflect xion properties of different coverings for recognition be exploited.

A reflection light barrier with a Bün is advantageous The radiation beam path as a touch sensor and a reflection light barrier with a scattering beam path as a lift-off sensor to a common, adjustable construction on the housing unit summarized, the transmitter and the receiver spatially close to each other and the Bün and the scattering beam path, for example lying in parallel in common reflection points on the Surface to be reflected. This ensures that in the event of a changed deflection or scattering of the well the beam of stray light also has its scattered light on the sensor the reflection light barrier with the scattered beam path strikes so that its recipient responds. A change The floor covering therefore always has a change in the output signals of both receivers of the reflection light barriers  Consequence, so that there is a redundant detection system. By arranging two retro-reflective sensors without a doubt also lifting the cleaning tool from be recognized on the floor, because then the two receivers There are no output signals. Via the detection circuit can for safety the Elek tromotor preferably from a restart lock be switched.

In a further embodiment of the invention, the push button sensor as a capacitive sensor like a plate capacitor formed, one plate spaced approximately parallel attached to the floor on the cleaning tool. In training as a push button is the other plate of the Capacitor lying approximately in one plane to the first plate provided, the second plate being the first plate preferably surrounds like a frame. This forms a to Ground-facing electric field. On the floor when the cleaning tool is standing, the value of the Capacitor depending on the dielectric constant of the material between the plates, one smooth hard surface a larger capacity value conditionally as a textile covering.

In training as a lift-off sensor, the other plate is the Capacitor formed by the bottom, the electrical Field is heavily bundled and penetrates deep into the ground. The large dielectric constant requires a large one Capacitor value that becomes smaller when it is lifted off the ground (ε = 1). This is recognized and the motor over the Speed controller switched off.  

In another embodiment of the invention, the key sensor formed by a feeler wheel, which is parallel to one Impeller is arranged, the tread of the feeler wheel - based on the tread of the wheel - by an amount is set back. The rotation of the feeler wheel is from detected by a sensor. If the feeler wheel turns, it is in place textile flooring in front; is the feeler wheel, is a hard, smooth flooring.

Further features of the invention result from the others Claims, the description and the drawing, according to following described in detail embodiments of the Invention are shown. Show it:

Fig. 1 is a side view and supply tool in partial section a cleaning with the brush roller for connection to a vacuum cleaning device,

Fig. 2 is a control circuit driving a schematic representation for the operation of the brush roller electric motor,

Figure 3 is a schematic representation of a push button sensor from two reflection light barriers.

Fig. 4 shows a section through a structural unit of the touch sensor of FIG. 3,

Fig. 5 is a schematic block diagram of a kapaziti ven switch sensor,

FIG. 5a is a schematic block diagram of a capacitive Abhebesensors,

Fig. 6 in section an electro-mechanical switch sensor,

Fig. 7 is a schematic representation of a motion sensor,

Fig. 8 is a sectional view of a suction cleaning device with electromechanical sensor support,

FIG. 9 shows a representation according to FIG. 8 with the support sensor unloaded.

Fig. 10 is a plan view of a capacitive touch sensor,

Fig. 11 is a plan view of another embodiment example of a capacitive touch sensor.

The cleaning tool shown in FIG. 1 is a so-called brush suction nozzle 1 , the housing 6 of which is supported on the floor 3 to be cleaned via rollers 2 . At one end of the casing 6 is seen with a connection piece 13 ver, which is held with a particular roller-shaped swivel head 55 about a horizontal axis 56 to pivot in the housing. 6 In the muffling section 14 facing away from the joint head 55 , a guide tube 15 is inserted, which is connected to a suction cleaning device via a suction line (not shown).

Where the joint 57 of the connection piece 13 gegenüberlie constricting end det ausgebil in the housing 6 is a brush chamber 4, which on its side facing the base 3 side of the suction opening 5 projecting from the tenfläche as a slot having a Be of the housing to the other transversely extends to the working direction (double arrow 190 ). A brush roller 8 is arranged above the suction opening 5 , the bristle 7 of which extends through the suction opening 5 , as a result of which the base 3 can be brushed. Parallel to the suction opening 5, there are sliding strips 12 delimiting the suction opening 15 , which rest on the floor 3 in the operating position of the brush suction nozzle. A suction air flow entering through the suction opening 5 leads in a manner not shown through the housing 6 to the joint 57 ge and exits through the connecting piece 13 .

Between the brush chamber 4 and the joint 57 , an electric motor 10 is arranged in the housing 6 , which is supplied with electrical energy via a cable, not shown, in particular through the connecting piece and the suction line. The electric motor 10 drives the brush roller 8, which is rotatably mounted in the brush chamber 4 , via a belt 9 .

A base plate 11 of the housing 6 of the brush suction nozzle 1 faces the floor 3 . The base plate 11 is in the operating position of the brush suction nozzle 1 with a spacing a, preferably parallel to the floor 3 . In the area of the Grundplat te 11 , a touch sensor 17 is held on the brush suction nozzle 1 , which preferably scans the floor surface 3 in a contactless manner in order to differentiate the flooring according to hard flooring or textile flooring. The sensor can work optically, inductively, capacitively, acoustically or the like. The arrangement of a mechanical / electrical sensor lying on the floor 3 is also possible.

In Fig. 2 is a block circuit provided with a number of components for speed control of the electric motor 10 is shown. The motor is connected via a TRIAC 84 to a voltage source 82 which, for. B. can be 220 V. In the circuit of the motor 10 is a particular electronic switching element, in the game Ausführungsbei the triac 84 connected, with which the motor current is adjustable. The motor armature voltage (signal line 85 a), the field voltage (signal line 85 b) and in particular the motor current (signal line 85 c) are communicated to a speed controller 83 via suitable sensors. The armature voltage is proportional to the motor speed multiplied by the motor current squared. From this relationship, the actual value of the engine speed can be determined, which is compared by the speed controller 83 with a predetermined current value for a target engine speed. Depending on the comparison, the triac 84 of the phase control is controlled to set a current value corresponding to the target motor speed; the specified speed is kept approximately constant. The current value corresponding to the target speed is via a potentiometer from a rectified, constant operating voltage of z. B. 15 V.

The signal line 85 c is connected to a motor protection circuit 99 which permanently monitors the actual value of the motor current. If the motor current exceeds a permissible, predeterminable maximum current, a control signal is output to the speed controller 83 via the output line 100 . When this control signal is present, the speed controller 83 will lower the motor current, preferably permanently block the triac 84 , in order to avoid damage to the electric motor 10 . The electric motor 10 can be switched off for a limited time, preferably permanently. In the latter case, the protection can only be unlocked by disconnecting it from the mains (switching off the cleaning tool).

A control line is further connected 101 to the speed controller 83, which connects the output of a detection circuit 81 to the speed controller 83rd A touch sensor 17 is connected to the input of the detection circuit 81 - via a conditioning circuit 80 - which is described in detail below. With the touch sensor 17 , the floor covering of the floor 3 can be seen , over which the suction cleaning tool 1 is guided. If there is a smooth floor covering such as parquet or the like, the signal on the control line is "zero"; in the case of a textile floor covering, the sensor 17 emits a corresponding signal, whereupon the detection circuit 81 emits a control signal on the control line 101 and the speed controller 83 sets a higher speed. The control signal can be a current value corresponding to the speed increase, which can be added directly to the predetermined setpoint in order to obtain the increased setpoint for the increased speed.

The control circuit according to the invention achieves that when a hard flooring is detected over the Speed controller a speed of approx. 800 rpm and at Detect a textile floor covering a speed of about 3,600 rpm is set independently.

According to the embodiment of FIGS. 3 and 4, the touch sensor 17 can be designed as a reflection light barrier, which scans the surface of the base 3 without contact. The directed against the ground reflection light barrier of the push button sensor 17 consists of a transmitter 21 with a bundle tion beam path 22 which is aligned on a receiver 29 tet. The bundling beam path 22 is focused precisely on the plane of the receiver.

Closely adjacent to the transmitter 21 , a further transmitter 20 of a reflection light barrier is arranged, which has a scattering beam path 23 which - reflected on the floor 3 - meets a receiver 30 arranged spatially close to the receiver 29 . The beam paths 22 and 23 are aligned so that they preferably show approximately the same reflection points 24 . The signals of the receivers 29 and 30 are fed to the detection circuit 81 via the conditioning circuit 80 .

Are the reflection light barriers - as shown in Fig. 3 Darge - aligned with the smooth, hard surface of a floor 3 , so the focused on the receiver 29, focused reflected beam path will lead to an output signal at the receiver 29 , while the scattered light of the scattering beam path 23 lying receiver 30 does not emit an essential output signal due to the low light intensity.

If the beam paths 22 and 23 hit a textile floor, they are scattered and the focusing of the beam path 22 is removed. The output signal of the receiver 29 becomes zero. Due to the missing output signal of the receiver 29 , the detection circuit 81 recognizes that a textile floor covering is present. The speed is set accordingly. The recognition will also redundant confirmed by the output signal of the receiver 30, which has a high value, since a part of the scattered light is incident of the condensing beam path 23 to the receiver 30 so that required along with the scattered light of the diverging beam path 23 is a nificant to signi increase of the output signal There is light intensity.

If the brush suction nozzle 1 is lifted off the floor 3 with the push-button sensor 17 , then none of the beam paths 22 and 23 is reflected, no light is incident on the receivers 29 and 30 . Both receivers thus have an output signal "zero", which can be derived from a further detection circuit 81 a ( Fig. 2) that the brush suction nozzle 1 is lifted off the floor 3 . This state indicating the output signal of the detection circuit 81 a is communicated via the output line 100 to the speed controller 83 , which blocks the triac 84 according to a signal from the motor protection circuit 99 , whereby the motor 10 is stopped. The light barrier formed from the transmitters 20 and 21 and the receivers 29 and 30 thus also represents a lift-off sensor 16 which forms a unit 19 with the push-button sensor 17 or is integrated in the push-button sensor 17 .

FIG. 4 shows the physical configuration of the touch sensor 17 according to FIG. 3. On a common support 31 , two cylindrical tube sections 32 are fastened, the longitudinal axes 33 of which intersect at a right angle. A light-emitting diode 40 is inserted into one tube section 32 and forms the light source of the two transmitters 20 and 21 ( FIG. 3). In the other end of the tube section 32 receiving the light-emitting diode 40 , an optical attachment element 26 for forming the beams 22 and 23 ( FIG. 3) is inserted. The optical attachment element 26 has an optical separation surface 25 which divides the optical attachment element 26 into two lenses 26 a and 26 b, the lens 26 a generating the bundling beam path and the lens 26 b the scattering beam path.

In the bottom 3 facing end of the other Rohrabschnit tes 32 a further optical attachment element 27 is inserted, which is divided in the same way as the attachment element 26 by an optical interface 28 into optical lenses 27 a and 27 b. The optical lenses are used to assign the beam paths in the manner described in FIG. 3 in order to direct the reflected light onto the receivers 29 and 30 arranged at the other end of the tube section 32 . The optical separating surfaces 25 and 28 lie exactly in the plane of the longitudinal axes 33 ; the longitudinal axes and thus the beam paths 22 and 23 strike the surface of the floor 3 at an angle and are reflected at the same angle to the receivers 29 and 30 in accordance with the laws of reflection.

The light emitting diode 40 is adjustable in the direction of the longitudinal axis 33 according to the double arrow c; the receivers 29 and 30 are transverse to the longitudinal axis 33 in the direction of the double arrow D individually or jointly adjustable. The carrier 31 of the Bauein unit 19 is such th on the housing of the brush nozzle 1 that it is adjustable in the direction of the double arrows A and B. There are therefore sufficient adjustment options for focusing and aligning the assembly 19 comprising the push-button sensor 17 and the integrated lifting sensor 16 .

Another embodiment of a push-button 17 is shown in FIG. 5. The touch sensor 17 is a capacitive sensor preferably in the form of a plate capacitor 35 is formed. The plates 37 'and 37 ''of the capacitor lie side by side in one plane, the field lines extending approximately arcuate from a plate 37 ' to the plate 37 ''. The field lines only have a small depth of penetration into the ground to rule out malfunctions. The capacitor 35 is part of an oscillator 38 , the frequency of an evaluation circuit 39 is supplied. The evaluation circuit emits an analog signal which - possibly via a conditioning circuit 80 ( FIG. 2) and / or a threshold switch - is fed to the detection circuit 81 .

The capacitance of the plate capacitor 35 is determined according to the formula C = ε × A / d. The result of this is that the capacitance of a structurally fixed capacitor is determined exclusively by the dielectric constant. Since the difference between the Dielektrizitätskonstan th of air (ε = 1) to other substances is very large and it can be assumed that a textile floor covering has an ε of about 1 due to the large amount of air between the fibers, while z. B. a parquet floor has a significantly larger, the capacity with a textile floor covering can be several times smaller than with a smooth floor, for. B. a parquet floor.

In accordance with the resulting capacitor value, the oscillator 38 oscillates and the oscillation frequency is evaluated in the evaluation circuit, which outputs a corresponding analog signal to the detection circuit 81 ( FIG. 2). The motor is switched over to the lower or higher number of revolutions of preferably 800 rpm or 3600 rpm via the speed controller 83 . During operation, the capacitive sensor 17 permanently monitors the floor covering. If this changes, the brush speed is switched accordingly. Without interrupting the work movement, the operator has the brush speed suitable for the floor covering in each case.

Since the formation of an undisturbed, limited electrical field is essential for the function of the touch sensor 17 , it is arranged in a shielded housing 36 a, which is preferably grounded. To ensure that the capacitive sensor 17 is predominantly active on the bottom 3 facing side of the plates 37 'and 37 '', an active electrode 36 is provided on the side facing away from the bottom 3, the plates 37 ', 37 '' . The gap d1 between the electrode 36 and the plates 37 ', 37 ''is filled with material, preferably a circuit board. The active screen formed by the electrode 36 oscillates at the fundamental frequency of the oscillator 38 .

In addition to the shielding provided, the plates 37 'and 37 ''of the capacitor 35 ' are preferably structurally special, to produce a particularly flat electric field. According to Fig. 10, the anode forming plate 37 'is designed as a rectangular, in particular rectangular surface; it lies in a frame which is formed by the cathode plate 37 ''. 'Is the frame-shaped cathode plate 37' around the periphery of the anode plate 37 'by a distance d2 preferably in an aligned parallel to the ground plane 3.

. According to the embodiment shown in FIG 11 is formed, the anode 37 'by an H; the cathode 37 '' consists in each case of a rectangle lying symmetrically between the legs of the H's, which are connected to one another by a narrow frame surrounding the H.

A capacitive sensor designed as a lift-off sensor 16 is shown schematically in FIG. 5a. It is in turn formed from a plate capacitor 35 a, the cathode plate 37 a of which is flat, in particular rectangular. The anode of the plate capacitor is formed by the bottom 3 . The field of the capacitor 35 a is as wide and concentrated as possible. Far in order to achieve a great depth of penetration into the ground, so that when the cleaning tool is lying on the ground, a large ε can act over a large field length, which results in a large capacity. Bundled in order to restrict malfunctions, for which purpose an active screen 36 and a housing 36 a which is at ground potential are also provided in accordance with the structure of the pushbutton sensor in FIG. 5. Between the active shield 36 and the cathode 37 a is located in the gap d1, a printed circuit board.

If the brush suction nozzle is lifted off the floor, the distance d increases and there is only air with ε = 1 in the field of the condenser. The capacity is smaller and the Os zillator 38 a detuned accordingly, which is detected by the evaluation circuit 39 a. This gives a suitably modified analog signal - optionally in the conditioning circuit 80 amplifies - to the detection circuit 81 b, the d off-hook of the cleaning tool 1 through a switching distance of about 10 mm an output signal on the line 100 to the speed controller 83 outputs, by disabling the triacs 84 turns off the engine. A risk to the operator by the rotating brush roller 8 is safely avoided.

This capacitive sensor is also part of an oscillator, which lies in the feedback branch as the measuring capacitance. Changes their capacity - e.g. B. by changing the Dielectric constant - the oscillator is detuned. This detuning is evaluated and as an analog signal fed to a threshold switch with hysteresis. The States of the threshold switch (ON / OFF) then show the respectively recorded conditions.  

In the embodiment of FIG. 6, a mechanical-elec trical push button sensor 17 is shown, which consists of a feeler wheel 41 be, which is parallel to a roller 2 of the brush suction nozzle 1 . The feeler wheel 41 thus rolls in the working direction 90 ( FIG. 1) from the brush suction nozzle 1 . Preferably, the impeller 2 and the feeler 41 have a common axis of rotation 45 and are spatially adjacent to each other; in particular, both wheels 2 and 41 are arranged on a common shaft 43 . The contact wheel 41 lies with its tread 47 set back by an amount b of approximately 3 to 4 mm to the contact surface 46 of the impeller 2 , so that the contact wheel 41 lies at a distance b from the ground in the case of hard flooring. When the brush suction nozzle 1 is moved over a hard floor covering, the feeler wheel 41 cannot rotate with it.

On a textile floor covering, on the other hand, the wheels 2 sink into the pile by an amount which is greater than the amount b, so that the running surface 47 rolls on the textile floor covering in synchronism with the working movement of the brush suction nozzle 1 . In order to achieve a high frictional connection between the textile floor covering and the feeler wheel 41 , a preferably hard bristle 47 a or a friction ring is arranged on the tread 47 thereof.

The rotary movement of the feeler wheel 41 is detected in the example shown in the embodiment shown in FIG. 6 by a forked light barrier 51 a. In the carrier disc 52 of the feeler wheel 41 are in order circumferential direction with distance u to each other, a sequence of an individual perforations 48 are arranged so that the forked light barrier 51 is a repeatedly interrupted by the webs between two through openings 48 during rotation of the feeler wheel 41st The light from a light source 50 falls through the openings 48 repeatedly onto the receiver 49 of the light barrier 51 a, which emits a corresponding pulse train. This is - if necessary via a processing circuit 80 ( FIG. 2) - supplied to the detection circuit 81 , which can derive from an existing pulse sequence that a textile floor covering is to be processed and a corresponding control signal for increasing the speed of the motor 10 via the control line 101 outputs to the speed controller 83 . If the pulse train is absent, the feeler wheel 41 stands , from which it can be deduced that there is hard flooring; There is no signal on the control line 101 of the detection circuit 81 and the speed of the brush roller is set correspondingly low.

In order to avoid unwanted movements of the feeler wheel 41 and thus possibly an unwanted switching of the motor 10 to a higher speed, it is provided to brake the feeler wheel. For this purpose, a friction brake in the form of a friction disk 42 can be provided, which is pressed axially against the feeler wheel 41 by the force of a spring. In another embodiment, braking can take place by means of a permanent magnet 34 , the field of which penetrates the feeler wheel formed from magnetic material.

In order to be able to distinguish when the feeler wheel 41 is stationary, whether the brush suction nozzle 1 is standing or is off the floor 3 or whether a hard floor surface is being cleaned, the carrier disk 53 of the impeller 2 is designed in the same way as the feeler wheel 41 with openings 48 and one Fork light barrier 51 b arranged, whereby a motion sensor 18 is ge forms. Upon rotation of the impeller 2 of the beam path of the light source 50 is alternately take over the perforations 48 to the receiver 54 and interrupted repeatedly by the land between two perforations 48th The receiver 54 thus emits a pulse train from which the detection circuit 81 a ( Fig. 2) can deduce that the brush suction nozzle 1 is moved. The touch sensor 17 is thus coupled to a motion sensor 18 . If the receivers 49 and 54 both emit a pulse train, there is a textile floor covering; if only the receiver 54 emits a pulse train, the floor covering is hard. If none of the receivers 49 and 54 emits a pulse train, the brush suction nozzle is up or has been lifted off the floor. In both cases, the motor 10 is switched off via the detection circuits 81 , 81 a, 81 b. This is preferably done via a timer integrated in the detection circuit, which only after a predeterminable time span of z. B. initiates the shutdown for 2 seconds. Short interruptions in the work movements cannot result in the engine being switched off.

Another type of motion sensor 18 is shown in FIG. 7. A wall part 55 a of the joint head 55 ( FIG. 1) of the connecting piece 13 is located in a fork light barrier and interrupts the beam path of a light source 18 a to a receiver 18 b. The movement of the brush suction nozzle 1 in the direction of the double arrow 90 ( FIG. 1) leads to a repetitive pivoting movement of the connecting piece 13 about the pivot axis 56 over an angle 92 , as a result of which a repeated relative movement between the housing 6 and the joint head 55 of the joint 57 occurs. The transmitter 18 a and the receiver 18 b ( Fig. 7) of the motion sensor 18 are housing-fixed angeord net, so that light barrier is moved relative to the fork due to the pivoting movement of the wall portion 55 a of the joint head 55 in the direction of arrow 91 . Part 55 a repeatedly interrupts the beam path of the fork light barrier. The correspondingly b at the receiver 18 can be tapped irregular pulse sequence is amplified in the processing circuit 80 (Fig. 2) and controls a in the detection circuit 81 a built-retriggerable timing element. With each occurring pulse the timer is started again so that when the work movement continues in the double arrow direction 90 ( FIG. 1) an output signal of the timer is permanently applied to the detection circuit and indicates the movement.

If the brush suction nozzle 1 remains for a predeterminable period of time at a point which is greater than the time impressed on the timing element, the timing element drops due to the lack of pulses. The detection circuit 81 a then switches an output signal which is fed to the speed controller 83 via the output line 100 and which leads to the switching off of the electric motor 10 . It is thus avoided that when working on textile floor coverings with the brush suction nozzle upright, mechanical damage can occur as a result of the brush roller acting too long. On the other hand, a lack of pulse train is also an indication of a raised brush suction nozzle, so that the initiated circuit can also prevent a hazard from the rotating brush roller.

In the exemplary embodiment according to FIGS . 8 and 9, a lift-off sensor 16 is shown, which according to FIG. 2 is connected to the detection circuit 81 via a processing circuit 80 . The contact sensor 16 consists of a microswitch 61 fixed to the housing, the spring-loaded switching pin of which rests on the shaft 63 of a sensing wheel, preferably the impeller 2 of the brush suction nozzle. The shaft 63 is held in a bearing 58 fixed to the housing, which is designed as a vertical slot. The slot has a width corresponding to the diameter of the shaft 63 , so that the shaft 63 in the bearing 58 is held horizontally but vertically displaceable. If the brush suction nozzle 1 is on the floor 3 , the shaft 63 is displaced to the upper end 59 of the slot, in this position the switch pin 60 is depressed and the microswitch 61 actuates an electrical switch contact. The detection circuit 81 b ( FIG. 2) detects that the brush suction nozzle 1 is resting on the floor 3 . The motor 10 ( Fig. 1) is put into operation according to the known surface of the bottom 3 .

If - as shown in FIG. 9 - the brush suction nozzle 1 is lifted from the bottom 3 in the direction of the arrow, the shaft 63 moves in the slot-like bearing 58 to the lower end 62 of the slot, as a result of which the switching pin 60 is released and the switching contact of the microswitch is actuated accordingly . The detection circuit 81 b ( FIG. 2) registers the lifting of the brush suction nozzle 1 from the bottom 3 of the motor 10 is switched off via the speed controller 83 .

The control circuit according to FIG. 2 advantageously has a restart lock, so that a switch off of the motor triggered by standstill or lifting of the brush suction nozzle 1 can only be canceled again by manual switching for the safety of the operator.

Claims (22)

1. Cleaning tool te for connection to the suction line of a vacuum cleaning device, with a rotatably disposed in a brush chamber (4) brush roller (8) whose Bebor stung (7) through a suction port (5) in a Grundplat (11) projecting of the cleaning tool, which at a predetermined distance (a) from the floor ( 3 ) to be cleaned, the brush roller ( 8 ) being driven in rotation by an electric motor ( 10 ), characterized in that the electric motor ( 10 ) is used to set the speed with a speed controller ( 83 ) is connected to the speed controller ( 83 ), the output signal of a circuit ( 81 ) connected to a touch sensor ( 17 ) for detecting the floor covering, the speed controller ( 83 ) depending on the output signal of the detection circuit ( 81 ) the speed of the Electric motor ( 10 ) sets. 2. Cleaning tool in particular according to claim 1, characterized in that the speed controller ( 83 ) is connected via a detection circuit ( 81 a) to a motion sensor ( 18 ) and, depending on the sensor signal via the speed controller ( 83 ), the electric motor ( 10 ) can be switched off . 3. Cleaning tool, in particular according to claim 1 or 2, characterized in that the speed controller ( 83 ) via a detection circuit ( 81 b) is connected to a lifting sensor ( 16 ), and in dependence on the sensor signal via the speed controller ( 83 ) of the electric motor ( 10 ) can be switched off. 4. Cleaning tool according to one of claims 1 to 3, characterized in that the sensor ( 16 , 17 , 18 ) is a non-contact scanning sensor. 5. Cleaning tool according to claim 4, characterized in that the sensor ( 16 , 17 ) is a reflection light barrier directed against the floor ( 3 ). 6. Cleaning tool according to claim 5, characterized in that the push-button sensor ( 17 ) has a transmitter ( 21 ) with a bundling beam path ( 22 ) which, when reflected on a smooth surface, strikes a receiver ( 29 ). 7. Cleaning tool according to claim 5, characterized in that the lift-off sensor ( 16 ) has a transmitter ( 20 ) with a diverging beam path ( 23 ) which, when reflected on the smooth surface of the floor ( 3 ), as scattered light on an assigned receiver ( 30 ) hits. 8. Cleaning tool according to claim 6 and 7, characterized in that the transmitter ( 20 , 21 ) and the receiver ( 29 , 30 ) form a common, on the housing ( 6 ) an adjustable unit ( 19 ), the transmitter ( 20 , 21 ) and the receivers ( 29 , 30 ) are spatially closely adjacent and the focusing beam path ( 22 ) and the diverging beam path ( 23 ) are deflected approximately parallel to one another at approximately common reflection points ( 24 ) on the surface of the floor. 9. Cleaning tool according to claim 8, characterized in that the transmitters ( 20 , 21 ) have a common light source, preferably a light-emitting diode ( 40 ), the beam path of which via an optical element ( 26 ) in front in the direction of the longitudinal axis ( 33 ) aligned parting plane ( 25 ) is divided into a bundling beam path ( 22 ) and an approximately parallel scattering beam path ( 23 ). 10. Cleaning tool according to claim 9, characterized in that the receivers ( 29 , 30 ) is assigned an optical attachment element ( 27 ) which has an optical parting plane ( 28 ) lying in the longitudinal axis ( 33 ). 11. Cleaning tool according to claim 4, characterized in that the sensor ( 16 , 17 ) is designed as a capacitive sensor in the manner of a plate capacitor ( 35 , 35 a), one plate ( 37 ', 37 a at a distance (d) approximately parallel attached to the floor ( 3 ) on the cleaning tool ( 1 ). 12. Cleaning tool according to claim 11, characterized in that the other plate ( 37 '') of the plate capacitor ( 35 ) lies approximately in one plane to the first plate ( 37 ') and preferably surrounds it like a frame. 13. Cleaning tool according to claim 11, characterized in that the other plate of the plate capacitor ( 35 a) is formed by the bottom ( 3 ). 14. Cleaning tool according to one of claims 11 to 13, characterized in that the capacitor ( 35 , 35 a) is part of an oscillator ( 38 , 38 a) and an evaluation circuit ( 39 , 39 a) from the detuning of the oscillator ( 38 , 38 a) forms a derived sensor signal which is fed to the detection circuit ( 81 , 81 b). 15. Cleaning tool according to one of claims 11 to 14, characterized in that the capacitive sensor ( 16 , 17 ) is arranged in a shielded, preferably grounded housing. 16. Cleaning tool according to one of claims 11 to 15, characterized in that on the side ( 3 ) facing away from the capacitor ( 35 , 35 a) an active, preferably with the fundamental frequency of the oscillator ( 38 , 38 a) vibrating electrode ( 36 ) is arranged. 17. Cleaning tool according to claim 1, characterized in that the touch sensor ( 17 ) is a touch wheel ( 41 ) which rolls in the working direction ( 90 ) of the cleaning tool ( 1 ) and the tread ( 47 ) of the touch wheel ( 41 ) - based on the Running surface ( 46 ) of an impeller ( 2 ) of the cleaning tool 1 - is set back by an amount (b) and the rotation of the feeler wheel ( 41 ) can be detected by a sensor ( 51 a). 18. Cleaning tool according to claim 2, characterized in that the motion sensor ( 18 ) is the impeller ( 2 ) of the cleaning tool ( 1 ), which is associated with a sensor sensing its rotational movement ( 51 b). 19. Cleaning tool according to claim 17 and 18, characterized in that the impeller ( 2 ) and the feeler wheel ( 41 ) are parallel to each other and have a common axis of rotation ( 45 ), are preferably arranged on a common shaft ( 43 ). 20. Cleaning tool according to claim 17 or 19, characterized in that the feeler wheel ( 41 ) is braked, preferably by a friction brake ( 42 ), a magnetic brake ( 34 ) or the like. 21. Cleaning tool according to claim 17 or 18, characterized in that the sensor is a light barrier ke ( 51 a, 51 b), preferably a fork light barrier, which is arranged with fields in the carrier disk ( 52 ) of the wheel ( 2 , 41 ), preferably Breakthroughs ( 48 ) cooperates. 22. Cleaning tool according to claim 3, characterized in that the support sensor ( 16 ) is a microswitch ( 61 ), the stylus ( 60 ) on a vertically in the housing ( 6 ) of the cleaning tool ver sliding shaft ( 63 ) of a sensing wheel, preferably the impeller ( 2 ).