MOBILE MACHINE TOOL WITH SUCTION UNIT AND CONTROL METHOD

Abstract

A mobile machine tool for processing a surface of a workpiece or of a room having a working device which is mobile with respect to a surface of the workpiece or room, which working device includes a tool receptacle for a work tool driven or drivable by a drive motor and/or a coating device having a coating tool for coating the surface, wherein the working device includes a suction device for suctioning the working device onto the surface by means of at least one force component oriented in a normal direction of the surface, wherein the suction device has at least one valve for controlling an intake air flow and/or a negative pressure in a suction region of the working device for suction onto the surface, and wherein the at least one valve has a valve member which is adjustable between at least two valve positions in which a flow cross-section of the valve is different. The suction device includes a suction controller for adjusting the valve member during operation of the work tool or the coating device between its valve positions depending on at least one physical variable.

Claims

1. A mobile machine tool for processing a workpiece or a room comprising a working device which is mobile with respect to a surface of the workpiece or room, which working device comprises a tool receptacle for a work tool driven or drivable by a drive motor and/or a coating device having a coating tool for coating the surface, wherein the working device comprises a suction device for suctioning the working device onto the surface by means of at least one force component oriented in a normal direction to the surface, wherein the suction device has at least one valve for controlling an intake air flow and/or a negative pressure in a suction region of the working device for suctioning onto the surface, and wherein the at least one valve has a valve member which is adjustable between at least two valve positions in which a flow cross-section of the valve is different, and wherein the suction device comprises a suction controller for adjusting the valve member during operation of the work tool or the coating device between its valve positions depending on at least one physical variable.

2. The machine tool according to claim 1, wherein the suction controller comprises a motorized valve drive and/or a spring arrangement for adjusting the valve member.

3. The machine tool according to claim 1 wherein the valve comprises a manually operable operating handle for adjusting the valve member.

4. The machine tool according to claim 1, wherein the at least one physical variable comprises an angular position of the working device relative to an underlying surface and the suction controller adjusts the valve member depending on the angular position of the working device relative to the underlying surface.

5. The machine tool according to claim 1, wherein the suction controller comprises a position sensor for detecting an angular position of the working device relative to an underlying surface as the at least one physical variable.

6. The machine tool according to claim 1, wherein the valve member is mounted in a valve housing of the valve for movement between at least two valve positions depending on an angular position of the working device relative to an underlying surface, wherein the valve member independently takes the valve positions by moving the working device into a respective angular position.

7. The machine tool according to claim 1, wherein the at least one physical variable comprises a motor output or motor current of the drive motor.

8. The machine tool according to claim 1, wherein the suction controller comprises a motor sensor, for detecting the motor output or motor current.

9. The machine tool according to claim 1, wherein the at least one physical variable comprises a pressure and/or a flow rate of an intake air flow in the suction region.

10. The machine tool according to claim 1, wherein the suction controller comprises a pressure sensor for detecting the pressure and/or a flow sensor for detecting the flow rate.

11. The machine tool according to claim 1, wherein the suction controller comprises at least one force sensor for detecting the pressing force as the at least one physical variable of the work tool or a guide contour onto the surface to be processed.

12. The machine tool according to claim 1, wherein the suction controller comprises a regulating device for regulating a negative pressure in the suction region depending on the at least one physical variable.

13. The machine tool according to claim 1, wherein the suction device comprises at least one other manually operable valve for influencing the negative pressure and/or the intake air flow in the suction region.

Description

[0119] Exemplary embodiments of the invention are explained below with reference to the drawing. Wherein:

[0120] FIG. 1 shows a perspective view of a surface processing system which is arranged in a room having at least one surface to be processed,

[0121] FIG. 2 shows a side wall of the room according to FIG. 1, on which two holding devices and the working device of the surface treatment system according to FIG. 1 are shown in a processing situation for processing the wall surface,

[0122] FIG. 3 shows a schematic bottom view towards the ceiling of the room according to FIG. 1, with the working device processing the ceiling of the room,

[0123] FIG. 4 shows a schematic view of a holding means of the surface treatment system according to the preceding figures, with a positioning drive and a flexible traction member,

[0124] FIG. 5 shows a holding device of the surface processing system in a first longitudinal position,

[0125] FIG. 6 shows the holding device according to FIG. 5 in a second longitudinal position,

[0126] FIG. 7 shows a first schematic view of a winding device of the surface processing system according to the preceding figures,

[0127] FIG. 8 shows another winding device of the surface processing system according to the preceding figures,

[0128] FIG. 9 shows an oblique perspective view of the working device of the surface processing system, which is shown in

[0129] FIG. 10 from above and in

[0130] FIG. 11 from below,

[0131] FIG. 12 shows a cross section through the working device approximately along a section line A-A in FIG. 10,

[0132] FIG. 13 shows another cross section through the working device of FIG. 10 along a section line B-B,

[0133] FIG. 14 shows a valve for controlling a negative pressure in a suction region of the working device,

[0134] FIG. 15 shows a mobile machine tool with a valve of a first type for controlling an intake air flow,

[0135] FIG. 16 shows a detail X1 from FIG. 15 with the valve in a different valve position,

[0136] FIG. 17 shows a plan view of the machine tool according to the two preceding figures, with a partial cutout,

[0137] FIG. 18 shows a detail view of the valve of the machine tool according to the three preceding figures,

[0138] FIG. 19 shows a section through the machine tool according to the preceding figure taken substantially along a section line S1-S1,

[0139] FIG. 20 shows a machine tool with another valve for controlling an intake air, which in

[0140] FIG. 21 is shown in partial section and with a different suction controller of the valve,

[0141] FIG. 22 shows a section through the machine tool according to the preceding figure, taken substantially along a section line S2-S2,

[0142] FIG. 23 shows a valve member of the valve of the machine according to the preceding figure,

[0143] FIG. 24 shows another machine tool having a valve for controlling the intake air flow, which is shown in

[0144] FIG. 25 in a partial sectional view in a first valve position of the valve and in

[0145] FIG. 26 in the same partial sectional view, but with a different valve position of the valve,

[0146] FIG. 27 shows a section through the machine tool of the three preceding figures, approximately along the cutting line of the partial section,

[0147] FIG. 28 an oblique perspective view of the machine tool according to FIG. 27 with a rod-shaped handle, of which

[0148] FIG. 29 shows a perspective view of a telescoping section and

[0149] FIG. 30 shows a side view,

[0150] FIG. 31 shows a longitudinal section through the arrangement according to the preceding figure, approximately along a section line S3-S3,

[0151] FIG. 32 shows a machine tool with another valve for controlling the exhaust air flow, which is shown in

[0152] FIG. 33 in a perspective view from above and in partial section in a first valve position of the valve, and is shown in

[0153] FIG. 34 with a second valve position of the valve,

[0154] FIG. 35 shows a machine tool with another valve for controlling the intake air flow, which is shown in

[0155] FIG. 36 in a partial sectional view, the valve being in a first valve position,

[0156] FIG. 37 shows an excerpt X1 from the preceding figure with the valve in a different valve position,

[0157] FIG. 38 shows a sectional view approximately along the partial sectional plane in the two preceding figures, wherein the valve assumes a passage position, and

[0158] FIG. 39 shows an excerpt X3 from the preceding figure, wherein the valve is in a blocking position,

[0159] FIG. 40 shows another working device with a position-dependent valve for controlling the intake air flow, and

[0160] FIG. 41 shows a working device with a cutting work tool and a coating device.

[0161] Using a surface processing system 10, surfaces of a room RA can be processed, for example a floor surface FB or side wall or wall surfaces FL, FR, FF, which are angled to one another. But the surface processing system can also be used for processing a ceiling surface FD of a ceiling in the room RA. Even the processing of the side surfaces FL, FR and FF of the side walls is exhausting for an operator, and processing of the ceiling surface FD even more so. This is because in this situation, the operator must hold a working device 50 with, for example, an operating stick or other similar handle, which is strenuous in the long run and in any case time-consuming.

[0162] Processing the surfaces FL, FR, FF, FD is clearer with the surface processing system 10, however.

[0163] The working device 50 is held on flexible traction members 30A, 30B, 30C, 30D and also suctions itself onto the surface FL, FR, FF, FD to be processed by means of a negative pressure generated by a vacuum generator 15, for example, a vacuum cleaner 15B with at least one force component in a normal direction N of the respective surface FL, FR, FF, FD.

[0164] The vacuum generator 15 is a vacuum generator that is separate and spatially separated from the working device 50. The vacuum generator 15 is flow-connected to the working device 50 by means of a flexible suction hose 11. Alternatively or in addition to the vacuum generator 15, a vacuum generator 15C arranged locally on board the working device 50 would also be an option.

[0165] The traction members 30A-30D can only serve as a safety measure, such that in the event of a pressure drop in the negative pressure provided by the vacuum generator 15, the working device 50 does not fall to the underlying surface, i.e. falls in the direction of the floor surface FB, but these members also enable autonomous or semi-autonomous operation, that is to say that the working device 50 can be positioned on the basis of the traction members 30A, 30B, 30C and 30D in relation to the respective surface FL, FR, FF, FD to be processed.

[0166] The vacuum generator 15 is, for example, a vacuum cleaner, that is to say that it sucks existing particles into a dirt collecting container 16 when processing a respective surface FL, FR, FF, FD of the room RA. This allows, for example, low-dust or dust-free processing of the surfaces FL, FR, FF, FD. The vacuum generator 15 has a suction unit 17, for example a turbine with an electric drive motor. Like the dirt collecting container 16, the suction unit 17 is accommodated on a housing 18. The housing 18 can be fastened in place on the underlying surface, for example the surface FB, but can also be freely movable there, for example by means of rollers 19. The rollers 19 can not be driven, such that the vacuum generator 15 remains stationary around room RA, or it can also be taken along by the working device 50 when it moves along the surface FL, FR, FF, FD to be processed. It is also possible that one or more of the rollers 19 are driven, in particular controlled by a control device 32, which will be explained below, in order to follow the movements of the working device 50.

[0167] The traction members 30A-30D are held by holding devices 20A-20D. The holding devices 20 are arranged in a stationary manner in the room RA, for example at the respective corner regions of the surfaces FL-FD. In the exemplary embodiment shown in the drawing according to FIG. 1, for example, the ceiling of the room RA is processed, that is, the ceiling surface FD. Accordingly, the holding devices 20A-20D are arranged in the respective inner corners, i.e. of the room A, thus in the corner regions of the surface FD, such that a large work region or work space is spanned for the working device 50 in which the working device 50 can be freely positioned by actuating the traction members 30A-30D or by at least one positioning drive 340A, 340B on board the working device 50. Positioning drives 40A, 40B, 40C, 40D provided for actuating the traction members 30A-30D and the positioning drives 340A, 340B form components of a positioning device 13.

[0168] The holding devices 20 can be arranged in the room RA, for example they can be braced, clamped or the like. For the respective adaptation to the spatial conditions of the room RA, the holding devices 20 are adjustable, for example, their respective longitudinal ends 23, 24 can be braced between opposing surfaces of the room RA, for example the floor surface FB and the ceiling surface FD.

[0169] The holding devices 20 are designed, for example, in the manner of braces, telescoping longitudinal supports or the like. The holding devices have a holding base 21 on which a support body 22 is mounted telescopically. For example, the longitudinal ends 23, 24 can be adjusted to longitudinal positions L1 and L2, where they can then be fixed by a fixing device 25 of the holding device 20. The fixing device 25 has, for example, a fixing base 26 on which a fixing body 26B, for example a clamp or the like, can be adjusted between a fixing position that fixes, for example, locks or jams, the support body 22 and a release position that releases it, for example by means of a shifting movement or a locking operation LO. In the unlocked or released state of the fixing device 25, the support body 22 can, for example, be longitudinally adjustable, which is indicated by a double arrow or a longitudinal adjustment LV in the drawing. The fixing device 25 can be or comprise a tensioning device, that is, for example, the support body 22 can be adjusted relative to the holding base 21 by means of a screw thread or similar other tensioning means, such that the holding device 20 is clampable, in particular its longitudinal ends 23, 24, between the opposing surfaces FD and FB.

[0170] A traction member guide device 27A, 27B, 27C and 27D is arranged on a respective holding device 20A, 20B, 20C, 20D in order to guide the traction member 30A-30D. The traction member guide device 27 has, for example, a guide body 28, in particular a guide groove and/or a guide roller on which the traction member 30 is guided. The guide body 28 is preferably movably mounted on a joint 29, about at least one pivot axis, preferably about multiple pivot axes, such that it can follow the movements of the respective traction member 30A-30D. The joint 29 is preferably a ball joint, a gimbal joint or the like.

[0171] The positioning drives 40A, 40B, 40C, 40D are arranged on the holding devices 20A-20D and each act on a traction member 30A-30D and operate it. To transmit a tensile force, a traction element 30 can be designed, for example, as a rope. However, a toothed belt is preferred, the respective length of which between the guide body 28 and the working device 50 can be precisely influenced or adjusted.

[0172] The positioning drives 40 have drive motors 41 which form traction member drives. The drive motors 41 drive drive rollers, in particular sprockets 42, which rotate about axes of rotation D1. The traction member 30 is guided over the drive roller 42, such that a rotary operation of the drive roller 42 by the drive motor 41 leads to a longitudinal adjustment of the traction member 30 and consequently to a positioning of the working device 50.

[0173] The traction member drives 41 are arranged between the guide bodies 28 on the one hand and a winding body 43 of a winding device 45 on the other hand. The winding device 45 winds up a section or strand of the traction member 30 that is not currently required. The winding body 43 is preferably spring-loaded by a spring arrangement 44, for example by a torsion spring. Of course, the angle body 33, for example a winding roll or a winding drum, can be driven by a drive motor in order to wind up the section of the traction member 30 between the tension member drive 41 and the angle body 43. The winding body 43 rotates, for example, about an axis of rotation D2.

[0174] A rotational speed sensor 46 is preferably provided to determine the length of that section of the traction member 30 which is adjusted by the traction member drive 41 in the direction of the winding device 45, i.e. that section with which the positioning drive 40 pulls at the working device 50. The rotational speed sensor 46 can, for example, form a component of the drive motor of the traction member drive, that is, measure the revolutions of the drive motor. It is also possible that the rotational speed sensor 46 is arranged, for example, directly on the traction member 30, for example by optical means, using a pickup roller and the like, to measure or detect the respective longitudinal adjustment of the traction member 30.

[0175] For example, the aforementioned control device 32 can control the positioning drives 40A-40D on the basis of the rotational speed information originating from the rotational speed sensor 46 or basically length information about the traction member 30. The control device 32 can be one on board the vacuum generator 15 and/or can comprise or be a control device arranged on board the working device 50.

[0176] It is also possible that the control device includes multiple parts, i.e., that parts of its components are arranged on board the vacuum generator and others are arranged on board the working device 50. These parts of the respective control device can communicate with one another.

[0177] The control device 32 can, however, also be or comprise a control device which can be positioned separately from, for example, the vacuum generator 15 in the room RA, as indicated schematically in the drawing.

[0178] For example, the control device 32 comprises a computer. The control device 32 preferably comprises input means 33, in particular a keyboard, a mouse, a touchsensitive screen or the like, as well as output means 34, for example a screen, signal lamps or the like, other optical output means and/or acoustic output means, for example a voice output, a loudspeaker or the like. The control device 32 further comprises a processor 35 for executing program codes of programs, for example a control program 37, which is stored in a memory 36 of the control device 32. The control program 37 can be loaded from the memory 36 into the processor 35.

[0179] The control device 32 communicates with the positioning drives 40A-40D via communication links 38A-38D, for example, control lines and/or wireless connections, for example, WLAN or the like. Wired communication links 38A-38D can, for example, be bundled in sections to form a collective line or collective communication link 38.

[0180] In this way, the control device 32 can, for example, control the positioning drives 40A-40D in such a way that it can control the working device 50 between several positions with respect to the respective surface FL, FR, FF, FD to be processed. For example, the traction members 30A-30D pull the working device 50 along the ceiling surface FD, positions P1 and P2 being shown in the drawing by way of example. It is readily possible that the working device 50 moves into the corner regions towards the respective guide bodies 28 of the holding devices 20 and also along or toward the edge regions of the ceiling surface FD. If, for example, the traction members 30D, 30C between the working device 50 and the guide bodies 28 of the holding devices 20D, 20C are particularly long, the working device 50 can be moved between the holding devices 20A, 20B, for example at the edge region of the surface FD, in order to process the surface FD.

[0181] The working device 50 is freely movable along the surfaces FL, FR, FF, FD of the room RA. For example, the suction hose 11, which connects the working device 50 to the vacuum generator 15, can follow the movements of the working device 50. An electrical supply line 12, which is preferably provided between the vacuum generator 15 and the working device 50, is correspondingly flexible and follows the movements of the working device 50 on the surface FL, FR, FF, FD to be processed. The supply line 12 can be guided in or on the suction hose 11, for example it can form part of the same. The supply line 12 is connected, for example, to an electrical port 52A of the working device 50. The supply line 12 supplies the working device 50 with electric power. An energizing device 804A, which supplies the working device 50, for example an electronically commutated motor thereof, with electric power via the supply line 12, can be on board the vacuum cleaner 15, for example.

[0182] The vacuum generator 15 can be connected to a power supply network, for example an AC voltage network, via an electrical connection line 14, which has a plug, for example. The power supply network is available, for example, in room RA using an outlet into which the connecting line 14 or its plug can be plugged.

[0183] In order to position the working device 50 with respect to a side wall, for example the wall surface FL, it is advantageous if, like in several corner regions, for example in the upper and lower corner regions of the surface FL, one traction member acts on the working device 50 via a stationary traction member guide device. A configuration would now be possible in which, for example, the holding devices 20C, 20D are arranged reversed with respect to their horizontal position in the room RA, such that their respective guide bodies 28 are arranged in the region of the floor or floor surface FB, close to the wall surface to be processed FL. For example, one of the holding devices 20C, 20D, the positioning drives 40 of which can then, so to speak, pull from below using a traction member 30 on the working device 50, can be arranged in addition to the holding devices 20A and 20B.

[0184] However, it is an advantageous concept if a second positioning drive, for example a positioning drive 40U, is arranged, so to speak, on a respective holding device 20, for example the holding devices 20A, 20B. The positioning drive 40U acts via a traction member 130A, 130B on the working device 50 when it is active on a side wall surface FL, FR, FF. For example, the positioning drives 40U also include the same or similar components as the positioning drives 40, such that, for example, a traction member drive 41 U acts on the traction member 130 by means of a drive roller 42U, which can be wound onto a winding body 43U, so to speak, in a downward winding direction or downstream of the traction member drive 41U. The winding body 43U forms part of a winding device 45U and is, for example, spring-loaded by means of a spring arrangement 44U in the sense of winding up the tension member 130 or driven by a drive motor not shown in the drawing. The respective length of the traction member 130 unwound or adjusted by the traction member drive 41U can be detected by means of a rotational speed sensor 46U.

[0185] The positioning drives comprise, for example, communication interfaces 47, 47U, in particular network interfaces (LAN, WLAN or the like), for communication with the control device 32 via the communication links 38. The communication interfaces 47 can also be or comprise Bluetooth interfaces, for example. An interface 39 of the control device 32 is designed for communication with the communication interface 47, therefore it includes, for example, a LAN, WLAN, Bluetooth interface or the like.

[0186] The positioning drives 40, 40U are held or arranged, for example, on a carrier 48 or a housing 48 which is fastened in place on the holding base 21 of a respective holding device 20.

[0187] A positioning drive 140 can also be used instead of a positioning drive 40, 40U. The positioning drive 140 comprises a drive motor 141 which is used to drive a drive roller 142. The drive roller 142 is arranged between an angle body 143, a winding device 145 and a guide body 28. A respective length of the section of the traction member 30 operated by the drive motor 141 can be detected, for example, by a rotational speed sensor 146, an encoder, which is arranged between the drive roller 142 and the guide device 27.

[0188] It is advantageous if a section of the traction member 30 is tensioned between the drive roller 142 and the winding device 145, for example using a tensioning device 149. The tensioning device 149 comprises a tensioning element 148, for example a tensioning roller, over which the traction member 30 runs. Thus, the section of the traction member 30 running between the drive roller 142 and the winding body 143 of the winding device 145 is kept under tension. As a result, among other things, the winding onto the winding member, onto the winding body 143, is optimized.

[0189] The winding body 143 can also be driven by a spring arrangement. In the present case, a winding drive 144, for example an electric motor, is provided. Based on the course of the traction member 30 between the tensioning member 147 and the winding body 143, the winding drive 144 can be activated, in particular regulated, for example to keep the traction member 30 under tension in this region.

[0190] A guide device is preferably provided for guiding the traction member 30 onto the winding body 143. This is illustrated in the drawing using the example of a winding body 243 and a guide device 248.

[0191] In a positioning drive 240, its winding device 245 simultaneously forms the positioning drive or the traction drive for the traction member 30. The traction member 30 runs from a drive roller 242 past a rotational speed sensor 246 to the guide body 248A of the traction member guide device, guide device 248. The speed sensor 246 measures the length of the traction member 30 unwound or wound onto the winding device 245 and thus the travel of the working device 50 when the traction member 30 is operated by the positioning drive 240.

[0192] The winding device 245 has a winding drive 244, which at the same time represents the traction member drive 241. The traction member drive 241 or winding drive 244 comprises, for example, an electric motor which can be controlled by the control device 32 via a communication interface 247.

[0193] The guide device 248 comprises, for example, a slide or traction member guide body 248A which is guided on a guide 248B. The guide 248B is, for example, a linear guide that runs parallel to an axis of rotation D2 about which the winding body 243 rotates. The traction member guide body 248A thus performs an oscillating back and forth movement along the linear guide 248B, such that the traction member 30 is optimally wound onto and unwound from the roller 243A.

[0194] It is possible that the control device 32 also controls the guide device 248 for the traction member 30. It is further possible that the winding device 245 has a local controller for the guide device 248 or that this guide device 248 functions automatically, so to speak, that is to say that it automatically follows the movement of the traction member 30 and ensures that a winding 243A of the traction member 30 wound onto the winding body 243 is accurately wound.

[0195] It is also possible to position the working device 50 by means of a positioning drive located on board the working device 50 relative to the workpiece surface or room surface FL, FR, FF, FD to be processed. For example, positioning drives 340A, 340B can be provided on the working device 50, which drives have drive motors, for example working device drives 341A, 341 B. The working device drives 341A, 341 B drive, for example, wheels or drive rollers 342 which can roll along the surface FL, FR, FF, FD to be processed. The working device drives 341A, 341B are assigned to different directions of movement or axes of movement, for example at angles to one another, in particular at right angles. Thus, for example, the control device 32 can also control the positioning drives 340A, 340B for positioning the working device 50 relative to the surface FL, FR, FF, FD to be processed.

[0196] The working device 50 comprises a machine tool 51. The machine tool 51 can also be considered a working device 50. The working device 50 or machine tool 51 comprises a drive unit 52 with a drive motor 53. A stator 54 of the drive motor 53 is arranged in a stationary manner with respect to a carrier 60 of the drive unit 52. A rotor 55 of the drive motor 53 rotates about a motor axis of rotation DM.

[0197] The drive motor 53 drives a tool holder 58 on which a work tool 90A, for example a plate tool 90, can be or is arranged.

[0198] An output 56 of the rotor 55, on which, for example, a gearwheel is arranged, drives an eccentric 57, in particular a drive 57B, e.g. a gearwheel, of the eccentric 57. The eccentric 57 has the tool holder 58 for the plate tool 90. The tool holder 58 is arranged on a rotary bearing 59 of the eccentric 57, such that the tool holder 58 can rotate about a tool axis of rotation DW. The tool axis of rotation DW and the motor axis of rotation MD have an eccentricity EX to one another. Thus, the plate tool 90 carries eccentrically about the motor axis of rotation DM and in a hypercycloid movement about the tool axis of rotation DW. Smooth running of the plate tool 90 can thus be achieved, which facilitates manual operation of the working device 50, but also operation using the positioning drives 40.

[0199] The carrier 60 has a cover wall 61 which covers the plate tool 90 at least on the upper side, preferably also on its outer circumference 93.

[0200] A motor mount 62, in which the drive motor 53 is received, projects in front of the cover wall 61. On its side facing away from the plate tool 90, the drive motor 53 has a fan 63 with which a flow of cooling air can be generated, which air passes through the drive motor 53.

[0201] The cooling air flow KL can flow out via a suction port 71 of a suction device 70 of the working device 50. The suction hose 11, for example, is connected to the suction port 71.

[0202] The plate tool 90 has a processing surface 91 for processing one of the surfaces FL, FR, FF, FD of the room RA, it being understood that another surface, for example a wood workpiece or a metal workpiece, can also be processed with the processing surface 91. Abrasive means, polishing means or the like can be arranged directly on the processing surface 91. In the present case, an adhesive layer 98 is provided on which a grinding means 99 is detachably held, for example an abrasive sheet. The adhesive layer includes, for example, Velcro fasteners, Velcro hooks, etc.

[0203] In the present case, the processing surface 91 is a planar surface, but it can also have a depression or a similar other contour, for example.

[0204] The plate tool 90 has a machine side 92, wherein the machine side 92 and the processing surface 91 face away from one another or are arranged on opposite sides of the plate tool 90.

[0205] The machine side 92 is provided on a plate tool carrier 100 and faces the cover wall 61 of the carrier 60. An elastic layer 101, for example, a so-called grinding pad or carrier pad, is arranged on the plate tool carrier 100, which is essentially rigid, for example made of a respectively resilient plastic material. The processing surface 91 is arranged on the side of the layer 101 facing away from the plate tool carrier 100.

[0206] Intake air inflow openings 94 are provided on the processing surface 91 and are flow-connected with the intake air outflow openings 95 on the machine side 92. For example, flow channels pass through the layer 100 and the plate tool carrier 101. Intake air AL can flow into the intake air inflow openings 94 through the intake air inflow openings 94. The intake air AL is shown in the drawing by hatched arrows.

[0207] The intake air AL serves to suction the plate tool 90 and thus also the working device 50 onto the workpiece surface to be processed.

[0208] The intake air inflow openings 94 are provided in a ring shape on the processing surface 91. For example, multiple, particularly at least two, in the present case four, concentric ring arrangements 94 A, 94B, 94C, 94D of intake air inflow openings 94 are provided.

[0209] The intake air inflow openings 94 are arranged in a ring about the central axis of the plate tool 90, which in the present case corresponds to the tool axis of rotation DW.

[0210] The intake air outflow openings 95 are likewise arranged in a ring about the tool axis of rotation DW. It is possible that multiple, particularly concentric, ring arrangements of intake air outflow openings 95 are provided. The drawing regularly shows a single ring arrangement of intake air outflow openings 95. The drawing regularly shows a single ring arrangement of intake air inflow openings 95.

[0211] Additional air inflow openings 96, through which additional air ZL can flow into the plate tool 90, are also provided on the plate tool 90. The additional air ZL is shown symbolically in the drawing by white arrows. The additional air inflow openings 96 are flow-connected to the additional air outflow openings 97 on the machine side 92 of the plate tool 90, for example by means of unspecified flow channels which penetrate the adhesive layer 98, the elastic layer 101, and the plate tool carrier 100.

[0212] In principle, it is possible that the additional air ZL also ensures that the plate tool 90 is suctioned onto the surface FL, FR, FF, FD to be processed. Additional air inflow openings 196 are provided on a plate tool 190 for this purpose, for example.

[0213] In the case of the plate tool 90, however, the additional air inflow openings 96 are arranged on its outer circumference 93. The additional air inflow openings 96 are thus oriented radially outward relative to the central axis, in the present case the tool axis of rotation DW, of the plate tool 90. Thus, the additional air ZL can convey particles, dust or the like from the surroundings of the plate tool 90 in the direction of the plate tool 90 and flow out through the additional air outflow openings 97.

[0214] The suction device 70 has an intake air inlet 72 which is assigned to the intake air outflow openings 95 and is flow-connected to them. Furthermore, the suction device 70 comprises an additional air inlet 73 which is flow-connected to the additional air outflow openings 97.

[0215] The intake air inlet 72 is defined by a seal 74, for example an annular seal, which rests against the machine side 92 of the plate tool 90. The seal 74, like a seal 75, is designed as an annular seal, the seal 75 being located radially outward with respect to the seal 74. An annular chamber, which defines the additional air inlet 73, is thus defined between the seals 74, 75. The radially outer seal 75 seals the auxiliary air inlet 73 from atmospheric pressure.

[0216] The intake air inlet 72 is, so to speak, a central intake chamber which is located in the interior of the seal 74. The intake air inlet 72 communicates directly with the suction port 71 and thus with the vacuum generator 15 via a bypass channel 76.

[0217] The additional air inlet 73 communicates with the suction port 71 via a valve 85, the valve member 86 of which is adjustable between at least two, preferably multiple, valve positions.

[0218] The valve 85 forms part of a suction controller 80 or can be controlled by the same. The valve member 86 is adjustable within a valve housing 87 of the valve 85, for example pivotable about a pivot axis SW1. Using the valve member 86, a valve passage 88 on the valve housing 87 can be opened or closed, wherein intermediate positions are also possible. On the inlet side, the valve 85 communicates with the additional air inflow openings 96, namely with the additional air inlet 73. The valve passage 88 and thus the outlet of the valve 85 is flow-connected to the suction port 71. Thus, depending on the valve position of the valve member 86, more or less intake air is suctioned in from the additional air outflow openings 97 and transported away via the suction port 71.

[0219] The valve member 86 has a cylinder jacket-like peripheral wall 86A, which can be moved past the inner circumference of a likewise cylindrical peripheral wall 87A of the valve housing 87. The peripheral walls 86A, 87A abut in a substantially sealing manner. A seal 88A is arranged between one end face of the peripheral wall 86A and the cover wall 61 of the carrier 60, which in this respect forms part of the valve housing 87. The seal 88A simultaneously acts as a clamping device 88B for clamping the valve member 86 in a respective valve position.

[0220] The peripheral wall 86A protrudes from a cover wall or bottom wall 86B of the valve member 86. The peripheral wall 87A of the valve housing 87 extends between the cover wall 86B and the cover wall 61 of the carrier. Thus the valve member 87 is sandwiched between the cover walls 61, 86B.

[0221] A pivot bearing 86C is provided for mounting the valve member 86 with respect to the valve housing 87. A bearing projection 86D, for example, protrudes from the cover wall 61 and engages in a bearing receptacle 86E of the valve member 86. A fastening element 86G, for example a screw, is used to secure the valve member 86 to the bearing projection 86D. The fastening element 86G preferably creates a bias of the valve member 86 in the direction of the seal 88A. The fastening element 86G extends, for example, parallel to the pivot axis SW1.

[0222] On the side facing away from the interior of the valve 85, the valve member 86 has an operating handle 86F which is used for gripping by an operator.

[0223] The operating handle is designed at the same time as an index element which can be adjusted, for example, in the direction of markings 89A-89D which indicate the respective valve position of valve 85.

[0224] One or more of the markings 89A-89D can, for example, have latching projections 89E with which the valve member 86, in particular the operating handle 86F, can be latched, for example with a latching lug or a latching projection 89F at its free end region. For example, the latching projections 89E can be provided in pairs at at least one of the markings 89A-89D, such that the operating handle 86F can latch between the latching projections 89E.

[0225] The markings 89A, 89D correspond, for example, to a passage position and a blocking position of the valve 85. The markings 89B, 89C indicate a mixing ratio of intake air flowing through the additional air inflow openings 96 and intake air flowing through the intake air inflow openings 94, which is optimally suitable for example for a side wall processing (marking 89B) or for a ceiling processing (marking 89C). When working on the ceiling, for example the ceiling surface FD, as little additional air as possible is suctioned in, such that the suction power or suction force in the normal direction N, which can be generated by the intake air via the intake air inflow openings 94, is as large as possible.

[0226] A working device 50A and its plate tool 90 essentially correspond to the working device 50, wherein a valve 185 is provided instead of the valve 85. The valve 185 either forms a component of a suction controller 180 or can be actuated by said controller. The valve 185 is used to control the negative pressure in the region of the additional air outflow openings 97, but pivots about a pivot axis SW2 which is transverse to the direction of flow of the intake air flow that flows through the suction port 71. A valve member 186 of the valve 185 is preferably arranged below the suction port 71. The valve member 186 has, for example, a partially cylindrical peripheral wall 186A, which extends between end walls 186B, 186C. The end walls 186B, 186C are, so to speak, the bottom and top sides of the imaginary cylinder of the valve member 186. Bearing projections 186D which engage in corresponding receptacles in the valve housing 187 and enable the valve member 186 to be pivoted about the pivot axis SW2 are for example arranged on the end walls 186A, 186B.

[0227] An operating handle 186F protrudes in front of the end wall 186B, for example an operating lever or operating projection, on which the operator can adjust the valve member 186 such that a valve passage 188 provided on the peripheral wall 186, i.e. an interruption of the peripheral wall 186 across a predetermined angular segment, can be brought into a passage position at the outlet of the additional air inlet 73, that is, that an opening between the seals 74, 75, is open, for example. However, when the peripheral wall 186A closes this opening 189.

[0228] In a working device 50B shown schematically, a valve 285 is provided instead of the valve 85 or 185. The valve 285 has a valve member 286 which can be manually operated using an operating handle 286f. The operating handle 286F is arranged on the valve member 286 of the valve 285. The valve member 286 has a plate-shaped wall body 286A. The wall body 286 has a partially annular shape, such that it can close or open a likewise partially annular opening on the cover wall 61, which opening defines a valve passage 288 of the valve 285.

[0229] The valve passage 288 extends within a valve housing 287 of the valve 285. The valve housing 287 has side walls 287A which protrude from the cover wall 61 and are closed by a cover wall 287B. The suction port 71 is arranged on the cover wall 287B. Furthermore, the valve housing 287 communicates with the intake air outflow openings 95, which are arranged in the interior of a peripheral wall 287C of the valve housing 287. In the interior space delimited by the peripheral wall 287C, which, so to speak, defines the intake air inlet 72, the drive motor 53 (shown schematically) is arranged, for example.

[0230] The operating handle 286F can, for example, engage in a guide recess 289, which is, for example, a kind of extension of the valve passage 288, having a clamping section or latching section not visible in the drawing, in order to latch, jam or the like the valve member 286 in one or multiple valve positions relative to the valve housing 287, in this case to the cover wall 61. The clamping section or latching section can, for example, engage in the guide recess 289 and be in engagement behind the same.

[0231] The guide recess 289 and the valve passage 288 run in a ring around a pivot axis SW3 about which the valve member 286 can pivot. The valve member 286 is adjusted about the pivot axis SW3 in a type of sliding movement along the valve passage 288. The pivot axis SW3 and the motor axis of rotation DM are preferably coaxial.

[0232] A valve 385 of a working device 50C essentially corresponds to the valve 285. Similar components are therefore identified by reference numerals which are by 100 greater than that of the valve 286. If the same components are present, these are provided with the same reference numerals.

[0233] A valve member 386 of the valve 385 closes a valve passage 388 which, like the valve passage 388, extends in an arc or ring shape around the pivot axis SW3. However, an operating handle 386F for manually operating the valve member 386 is not guided on the valve passage 388, but on a guide 385G that is separate therefrom. The guide 386G, like the valve passages 288, 388, extends in a ring about the pivot axis SW3. Using the separate guide 386G, any desired clamping devices, latching devices or the like for clamping or latching the operating handle 386B and thus the valve member 386 in predetermined valve positions can be implemented.

[0234] The valve 385 preferably comprises a valve drive 82, for example a drive motor 382, which is in driving engagement with, for example, the cover wall 61 or another component that is stationary with respect to the carrier 60. For example, the drive motor 382 can have a pinion on its output, which pinion engages in a gearing fixed on the carrier 60. For a manual operation of the valve 385 the pinion can, for example, be disengaged from the gearing or the drive motor 382 can run with little resistance. Decoupling of a valve drive for manual operation of a valve is therefore possible within the scope of the invention.

[0235] A working device 50D is constructed similarly to the working device 50B, 50C and has a valve 485 instead of the valves 285, 385. The valve 485 has a valve housing 487 which is constructed similarly to the valve housing 287 and accordingly has the same reference numerals in the drawing. A valve passage 488 of the valve 485 communicates with the additional air inlet 73 and can be closed by a valve member 486.

[0236] The valve member 486 has a wall-like or plate-like shape, for example a plate body 486A, which can be pivoted about a pivot axis SW4 between a passage position DS, in which the valve passage 488 is flow-connected to the suction port, and a closed position SS, in which the valve passage 488 is closed.

[0237] The negative pressure present at the suction port 71 applies a force on the valve member 486 in the direction of its open position DS and can be acted upon by an operating device with an operating element 486B in its closed position SS.

[0238] Instead of or in addition to the operating element 468B, a spring 468K can easily be provided which forces the valve member 486 into its closed position SS. In this case, the valve 485 works in a pressure-controlled manner, that is, when the negative pressure at the suction port 71 is greater than the spring force of the spring 468K, the valve 485 opens, such that the negative pressure in the suction region or on the processing surface 91 of the plate tool 90 drops because, so to speak, external air can flow through the additional air inflow openings 96.

[0239] The operating element 486B is pivotably mounted to the valve housing 487, for example to one of the side walls 487. The operating element 486B comprises, for example, a pivot lever, the free end region of which can act on the valve member 486 in order to move it into the closed position SS. The operating element 486 thus has, for example, a lever-like shape or a lever.

[0240] An operating handle 486F, for example a pivot lever, which is arranged on an outer side of the valve housing 487, for example, also on one of the side walls 487A or 487B, is connected to the operating element 486B. The operating handle 486B includes, for example, an operating lever that can be gripped by the operator. The operating handle 486F can be latched in various latching positions which correspond to the valve positions of the valve 485, for example the positions DS or SS, using a latching device 486H, for example in the passage position and/or the blocking position and preferably one or more intermediate valve positions. The latching device 486H has, for example, latching projections 4861 with which the operating lever 486G can be latched. The latching projections 4861 project from one of the side walls 487A.

[0241] A so-to-speak automatic valve 585 of the working device 50E, which operates in any case depending on the position, has a valve member 586 in the form of a roller, in particular a ball or the like. The valve member 586 is received in a valve housing 587 of the valve 585 in such a manner that it can move freely. The valve housing 587 has, for example, a peripheral wall or side walls 587A, which taper, so to speak, towards an outlet 587B of the valve housing 587 or are oriented towards one another. The valve housing 587 is therefore narrower in the region of the outlet 587B than in the region of one or more valve passages 588 which are provided on a wall 588A which, so to speak, closes the additional air inlet 73. Consequently, air flowing via the additional air inlet 73 can flow via one or more of the valve passages 588 to the outlet 587B, which in turn is flow-connected to the suction port 71.

[0242] When the working device 50 assumes an overhead position, for example when processing the ceiling surface FD, the valve member 386 moves away from the valve passage 588 into a position that closes the outlet 587B, which is indicated in the drawing with a continuous line of the valve member 586. Thus, air flowing through the additional air inflow openings 96, which represents false air, so to speak, can no longer reach the suction port 71, as a result of which the suction force in the region of the intake air inflow openings 94 is increased. If, however, the working device 50 assumes a vertical orientation, for example, that is to say that the working surface 91 runs vertically, the valve member 586 can move away from the outlet 587B, for example slide or roll along a slope of the side walls 587A, such that the outlet 587B becomes free and thus supply air or false air can enter via the additional air inflow openings 96.

[0243] The drawing also indicates that the valve member 586 can also move into a position that closes the at least one valve passage 588 (shown in dashed lines).

[0244] In the embodiment of the plate tool 190, it is also indicated that an additional air inflow opening 196 can also be arranged on the processing surface 91, such that the valve 585 can be directly used, for example, to influence the air flow flowing over the processing surface 91 or the negative pressure prevailing there.

[0245] In addition to the, so to speak, automatically functioning concepts of influencing the negative pressure by manually operated valves or position-dependent valves (585), servo-motor or regulated concepts are also easily possible:

[0246] For example, the suction controller 80 comprises a regulating device 81. The regulating device 81 can, for example, control the motorized valve drive 82, in particular a servo-motor. The valve drive 82 can for example directly drive one of the valve members 86, 186, 286, 386, or 486.

[0247] The valve drive 82 can also include, for example, a magnetic drive 582, for example an electrical coil, in order to operate the valve member 586 for moving into one or more valve positions.

[0248] The suction controller 80 can use sensor signals from one or more sensors of a sensor arrangement 83 to control the valve drive 82, for example using a position sensor 83A, the output signal of which indicates an angular position of the working device 50 relative to an underlying surface, for example the surface FD. A motor sensor 83B in turn is, for example, a current sensor or comprises a current sensor, the output signal or sensor signal of which, for example, indicates an output of the drive motor 53. Depending on the suction of the working device 50 onto the surface to be processed, the friction of the processing surface 91 on the surface to be processed changes, wherein the drive power of the drive motor 53 and thus its motor current then also changes, which can be detected by the motor sensor 83B. The control device 81 can then, for example, actuate the motorized valve drive 82 in the case of an increased motor output in the sense of a reduction in negative pressure in the intake region, and in the case of a decreasing motor output in the sense of an increase in the negative pressure.

[0249] But direct pressure measurement or flow measurement is also possible, namely using the pressure sensor 83C and/or the flow sensor 83D. For example, the pressure sensor 83C is arranged in the negative pressure region or suction region and directly measures the negative pressure with which the plate tool 90 and thus the working device 50 is suctioned onto the surface to be processed.

[0250] For example, a force sensor 83F, 83G can be used, for example a strain gauge or the like, which measures the pressing force with which the contact body 65B and/or the plate tool 90 presses against the surface to be processed. The force sensor 83G can be provided, for example, on the drive train, for example on a bearing, of the working device 50. If the contact force of the contact body 65B becomes too great, the suction controller 80, in particular the regulating device 81, can actuate the valve drive 82 in the sense of reducing the negative pressure, or if the pressing force is too low, in the sense of increasing the pressing force.

[0251] The working devices 50, 50A, 50B, 50C, 50D, 50E, 5OF can be provided for manual operation, that is to say, operation guided by an operator. However, it is also possible that they are used in connection with the positioning device 13 for a type of robot operation.

[0252] For example, the working device 50 is described below in an installation position in a housing 64 which can be operated by the positioning device 13. The carriers 60 of the other working device 50A, 50B, 50C, 50D, 50E, 5OF can also be operable by the traction members 30 and can preferably also be accommodated in the housing 64.

[0253] It can be seen that the working device 50 can be used autonomously or hand-held. The traction members 30, for example, can also act directly on it. In the present case, however, the working device 50 is designed in such a manner that the carrier 60 including all components held thereon, namely the drive unit 52 and plate tool 90/work tool 90A are accommodated in a housing 64. The housing 64 forms a suction housing 64A, the interior space 64E of which forms a vacuum space, so to speak. The housing 64 has a peripheral wall 64B which is covered by a cover wall 64C. The cover wall 64C has a dome or a hood 64D, in which a flow channel or a flow chamber for the cooling air KL is formed, which air flows out of the drive motor 53 or its fan 63.

[0254] The cooling air KL can be sucked off via a suction port 64F, to which, for example, the suction hose 1 can be connected directly. The suction port 64F communicates fluidically with the suction port 71 of the drive unit 52, which is arranged in the interior space 64E, such that air flowing out of the suction port 71, which represents an exhaust air nozzle, can be suctioned out via the suction port 64F.

[0255] Traction member holders 67 are provided on the housing 64, to which holders the traction members 30A-30D can be detachably fastened, for example, can be connected by means of a latch arrangement, can be connected to a magnetic holder or the like. Thus, the traction members 30 can be easily detached from the holders 67 by an operator or easily attached to the latter, but then have a firm hold, such that the tensile forces of the positioning device 13 or the positioning drives 40 can be transmitted to the working device 50.

[0256] The holders 67 are provided at the same angular intervals, for example of 90° each, on the housing 64, such that the tensile forces of the traction elements 30 can be optimally transmitted to the housing 64.

[0257] The housing 64 also carries a guide device 65 which is used to guide the surface FL, FR, FF or FD to be processed. The guide device 65 comprises a guide support 65A which is fastened to the housing 64 or forms an integral part of the housing 64. The guide carrier 65A supports at least one contact body 65B, for example, an annular contact body 65B or an arrangement of a plurality of contact bodies arranged in a ring shape, which extend around the work tool 90A. The guide supports 65A have guide contours 65C, for example guide surfaces, which preferably are in the same plane as the processing surface 91 when the machine tool 51 is in contact with one of the surfaces FL-FD, as is shown schematically in the drawing. The contact body 65B preferably comprises a seal, in particular a sealing ring, which defines a suction region 65G of the housing 64. The plate tool 90 or work tool 90A is arranged within the suction region 65G.

[0258] It can be seen that thus not only the plate tool 90, but also the entire housing 64 is suctioned onto the surface of the workpiece or the room to be processed. However, the working device 50 is guided primarily via the contact body 65B with respect to the surface to be processed.

[0259] The contact body 65B is movably supported with respect to the guide carrier 65A and is spring-loaded by springs 65D in the direction of a contact position in which the guide contours 65C contact the surface to be processed. Like the contact body 65B, the springs 65D are accommodated in a spring chamber 65E, where they are linearly movable in the normal direction with respect to the processing surface 91 or in the normal direction with respect to the guide contour or guide surface 65C, preferably also pivotable transversely to this direction. This is because the contact body 65B is preferably not only mounted to the guide support 65A in a linearly displaceable manner parallel to the motor axis of rotation DM or the tool axis of rotation DW, but also transversely thereto about at least one pivot axis. The contact body 65B is therefore floatingly mounted in the spring chamber or bearing receptacle 65E.

[0260] The plate tool 90 is preferably flexible with respect to the surface to be processed, for example due to the elastic layer 101. An optimal adaptation to the contour of the surface to be processed is further improved by the fact that the drive unit 52 is movably supported with respect to the guide device 65 by means of a bearing device 66.

[0261] The bearing device 66 comprises, for example, a membrane 66A which is fastened in place relative to the housing 64, namely for example sandwiched between holding sections 66B, 66C, which are provided on the one hand by the housing 64, namely its peripheral wall 64B, and on the other hand by a valve carrier 64H. The valve carrier 64H extends in an annular manner around the work tool 90A and is, so to speak, sandwiched between the guide device 65, in particular the guide carrier 65A, and the peripheral wall 64B.

[0262] The membrane 66A thus enables a floating, multi-axial pivoting movement of the drive unit 52 with respect to the housing 64 or the guide device 65, such that the work tool 90A can easily follow a surface contour of the surface to be processed. In addition, the work tool 90A can be adjusted linearly with respect to the guide device 65, namely parallel to the tool axis of rotation DW.

[0263] Instead of the membrane 66A, for example, pivot bearings, in particular gimbal pivot bearings, and/or sliding bearings may be provided.

[0264] The drive unit 52 and thus the work tool 90A are preferably spring-loaded into a contact position in which they are in contact with the workpiece surface to be processed, for which a spring arrangement 69 is provided, for example. The spring arrangement 69 comprises an arrangement of one or more springs 69A, which are supported on the one hand on the housing 64 or the carrier 60 and on the other hand on the membrane 66A, namely by means of spring holders 69B, 69C. The spring holders 69C are arranged on the membrane 66A, the spring holders 69B are stationary with respect to the guide device 65, namely stationary with respect to the housing 64. Since the housing 64 is stationary with respect to the guide device 65, the spring holders 69B support the springs 69A, the bearing device 66 and thus the drive unit 52 held thereon with respect to the guide device 65.

[0265] The bearing device 66 further allows that the work tool 90A moves from the working position shown in the drawing, in which the work tool 90A is in contact with the surface to be processed, into a rest position shifted away therefrom. For this purpose, actuators 68, for example servo-motors or the like, are provided. The actuators 68 have drive elements 68A, for example levers, rollers or the like, with which they act on transmission elements 68B, for example traction members, tension cables, rod-like members or the like. The transmission elements 68B are connected to the drive members 68A and the drive unit 52, namely to the membrane 66A, which in turn are connected to the drive unit 52. The transmission elements 68B therefore pull the membrane 66A away from the guide contour 65C, so to speak, in order to move the work tool 90A into the rest position. The rest position is advantageous, for example, when the work tool 90A is not needed, in particular when it is prepositioned before the actual surface treatment. As a result, the plate tool 90 cannot cause any damage, so to speak, but is instead made inactive or held in the rest position until the actual surface treatment begins.

[0266] The actuator(s) 68 preferably act on the membrane 66A or the drive assembly 52 at at least two opposing or several points having the same angular distances from one another.

[0267] It is possible that a basic suction force with which the plate tool 90 suctions onto a surface to be processed is set on the basis of the valves 85-585. However, it is also possible for the valves 85-585 to be fully opened. In both scenarios, the suction force controller or influence by negative pressure as explained below can be used advantageously:

[0268] This is because additional air which flows through the additional air inflow openings 96 can not only be influenced on the machine side 92 of the plate tool 90, but also from outside, so to speak.

[0269] This is because valves 685 are arranged on the housing 64, in particular the valve carrier 64H, of the working device 50. The valves 685 have valve passages 688 which are arranged, for example, on a wall 687 of the valve support 64B. The wall 687 extends in an annular manner next to the peripheral wall 64B of the suction housing 64A and forms a kind of step. Preferably, a plurality of mutually spaced apart, in particular angularly spaced apart, valve passages 688 are provided on the wall 687. The valve passages 688 have, for example, an annular shape and thus follow the outer peripheral contour of the peripheral wall 64B. The valve passages 688 are in fluid communication with an annulus 689 that extends around the work tool 90A. The annular space 689 is also open to the additional air inflow openings 96 on the radial outer periphery of the work tool 90A, such that air flowing in via the valve openings 688 can reach the additional air inflow openings 96 and thus reduce the suction force in the region of the intake air inflow openings 94, so to speak. False air, so to speak, is then suctioned in via the suction port 71 or 64F, namely through the valve openings 688 and the additional air inflow openings 96.

[0270] The valves 685 comprise valve members 686. The valve members 686 are plate-like and have a support layer 686A on which a sealing layer 686B is arranged. The sealing layer 686B faces the wall 687 and is suitable for sealingly closing the respective valve passage 688.

[0271] The valve member 686 is movably mounted on bearing projections 686C, 686D which project in front of the wall 687. For example, the bearing projections 686C, 686D are bolts, screws or the like, along which the valve member 686 can slide and/or pivot.

[0272] In a closed position SS, the valve member 686 closes the valve passage 688, while it is released in an open position DS of the valve member 686.

[0273] Linear adjustment of the valve member 686 relative to the longitudinal axes of the bearing projections 686C, 686D is possible, for example. In the present case, however, a pivoting movement of the valve member 686 at one of the bearing projections 686C, 686D is desired. The pivoting movement is triggered or made possible, for example, in that springs 686F, 686G, which are arranged on the bearing projections 686C, 686D and are supported on support projections 686H of the same, and the valve member 686 differ in thickness or are biased to different degrees. For example, the spring 686F has a smaller spring force than the spring 686G because it is less biased.

[0274] The springs 686F, 686G press the valve member 686 into the closed position SS. The valve member 686 can be moved into its open position DS by the negative pressure in the suction region 64G. Because if the atmospheric pressure is greater than the negative pressure in the suction region 64G to a predetermined extent, it acts on the valve member 686 in the sense of opening the valve 685. In this way, automatic, so-to-speak, negative pressure regulation is implemented by a spring arrangement.

[0275] In addition, the operator can also let external air or additional air flow into the suction region 64B via valves 685M. The valves 685M include valve passages 688B that are disposed on the radially outer circumference of the valve carrier 64H. The valve passages 688 are flow-connected to the suction region 64G and can be closed by at least one valve member 686M. The valve member 686M is for example an annular body, in particular with a plate shape, which can be pivoted about an axis of rotation parallel to the axis of rotation of the motor MD. A plurality of operating handles 686H, for example operating projections, are arranged on the valve member 686M, such that the operator can adjust the valve member 686M between a passage position that opens the valve passages 688B and a closed position that closes them, and preferably one or more valve positions in between, by moving one of the operating handles 686H.

[0276] The working devices 50, 50A, 50B, 50C, 50D, 50E, 50F can be adjusted by the positioning device 13 relative to the surfaces to be processed. However, it is also possible to operate it using a handle, which will become even clearer below.

[0277] A rod-shaped handle 800 is preferably articulated to the working device 50, 50A, 50B, 50C, 50D, 50E, 50F in a multi-axial pivotable manner. For example, a swivel joint 801 is provided, which supports the handle 800 so as to be able to pivot with respect to a pivot axis SQ which runs transversely to a longitudinal axis LL of the handle 800. Further pivotability about another pivot axis, which for example runs transversely to the pivot axis SQ, is implemented by a pivot joint 801, which is only indicated schematically in the drawing. The pivot joints 801, 802 together form a gimbal pivot joint.

[0278] A fixed rod section 803 of the handle 800 runs from the pivot joint 801 along the longitudinal axis LL. At the longitudinal end region of the rod section 803 distant from the working device 50, a powering device 804 is provided for power supply, for example, to the drive motor 53. At this point, it should also be mentioned that the drive motor 53 is preferably an electronically or electrically commutated drive motor.

[0279] The powering device 804 is arranged between the rod section 803 and a telescoping section 805 of the handle 800. The telescoping section 805 comprises a base tubular body 806 which is fixedly connected to the powering device 803. An adjustable tubular body 807 is mounted on the base tubular body 806 so as to be movable with respect to the longitudinal axis LL. For example, the adjustable tubular body 807 engages in an interior space of the base tubular body 806.

[0280] A support body 808, which preferably extends transversely to the longitudinal axis LL, is located at the free end region of the adjustable tubular body. The support body 808 is suitable, for example, as a support for resting against a body of the operator, for example as a type of shoulder support or the like. This makes the handle 800 extremely ergonomic.

[0281] The adjustable tubular body 807 can be adjusted relative to the base tubular body 806 along an adjustment path which is limited by longitudinal stops 809, 810, which are arranged on the base tubular body 806 or on the adjustable tubular body 807. In a respective longitudinal position of the adjustable tubular body 807 relative to the base tubular body 806, the latter can be fixed by means of a fixing device 811. The fixing device 811 comprises, for example, a holder which is fastened to the base tubular body 806 in the manner of a sleeve or clamp, for example using radially protruding retaining projections 815 which are for example screwed together, braced or the like. The holder 812 has a clamp 813 which, by means of an operating handle 814, for example a clamping screw, a clamping lever or the like, is adjustable between a position that clamps or fixes the adjustable tubular body 807 with respect to the base tubular body 806 and a position releasing it with respect to the base tubular body 806 and thus adjustable release position.

[0282] The working device 50F should be considered an example of the fact that a coating device or a working device suitable for machining a workpiece surface, for example an area, can also be operated and positioned using the positioning device 13.

[0283] The working device 50F has a coating device 980 having coating heads 981A, 981 B as coating tools 981. The coating heads 981A, 981 B are designed for coating a surface to be processed or coated, i.e. they can apply a coating fluid, in particular a color liquid, color particles, to the surface, for example. The coating fluid is contained in reservoirs 983A, 983B of the working device 50F and/or is supplied to the working device 50F via flexible lines from a stationary device, for example a storage container on a vacuum cleaner 15B. For example, paint or a similar other coating fluid can be contained in the reservoirs 983A, 983B, which fluid can flow via lines 982A, 982B to the coating heads 981A, 981 B in order to coat the surface to be processed, for example to color it and/or to be provide it with a protective layer or the like.

[0284] Furthermore, the coating device 980 can also include, for example, an erasing device 985, in particular an erasing head, with which at least parts of the coating applied using the coating heads 981A, 981 B can be erased again.

[0285] The erasing device 985 or the erasing head as well as the coating tools 981 or coating heads 981A, 981 B are or can be connected, for example, via communication lines 984 to the control device 32. Instead of a communication line 984, a wireless connection, for example a radio connection, from and to the control device 32 can of course also be provided. Via the communication lines 984, the control device 932 can, for example, control the application of paint or similar other coatings by the coating tools 981 or coating heads 981A, 981B, or it can cause or actuate an erasure by the erasing device 985, which includes, for example, an eraser, a grinding head or the like.

[0286] The coating device 980 is arranged on a, particularly plate-like, support body 990. The support body 990 has, for example, a base body 998 on which a processing surface 991 is provided, for example a support surface for resting against the surface to be processed. The processing surface 991 is provided, for example, on a sliding body or a sliding layer 999 which is arranged on the front side of the base body 998.

[0287] The coating heads 981A, 981B and the erasing head 985 are arranged, for example, on cavities of the base body 998 that are set back behind the processing surface 991.

[0288] The additional air inflow openings 96 already explained above, the intake air inflow openings 94 and the like, for example, which communicate with the additional air inlet 73 already explained above and the intake inlet 72, can be arranged on the base body 998. Suction control is possible, for example, by means of the valve 585, such that the processing surfaces 991, like the processing surfaces 91 already explained above, can be optimally suctioned onto the surface to be processed.

[0289] All of the aforementioned exemplary embodiments in connection with the working devices 50-50E are therefore also possible in the working device 50F with regard to suction control or vacuum control on the working surface 991, which is or forms a support surface in this respect.

[0290] Furthermore, the working device 50F can comprise or form a machine tool 951. This can be provided as an alternative or in addition to the coating device 980.

[0291] The machine tool 951 comprises a drive motor 953 which drives a tool holder 958 via a tool shaft 956. A work tool 90F, for example a milling head, is or can be arranged on the tool holder 958.

[0292] The processing surface 991 forms, for example, a guide contour 965C of a guide device 965.

[0293] The milling head or other work tool 90F can project permanently in front of the processing surface 991 or guide contour 965C or, advantageously, can be movable by means of an actuator 994 between a position (shown in dashed lines) that projects further in front of the processing surface 991 or guide contour 965C and a working position or depth setting position less far away from the processing surface 951 or guide contour 965C, in particular even retracted behind the working surface 991. Thus, the work tool 90F can penetrate more or less far into the workpiece to be processed. It is particularly possible during positioning by the positioning device 13, in which the work tool 90F is not processing the surface to be processed or is inactive, that the work tool 90F is moved back behind the guide contour 965C, such that it is not in contact with the workpiece.

[0294] The actuator 954 and the drive motor 953 are or can be connected via communication links 955, for example communication lines or wireless connections, to the control device 32 which controls the drive motor 953 and the actuator 954 as required for the workpiece surface to be processed.

[0295] In the same way, it is basically also possible that, for example, the coating tool 981 and/or the erasing device 985 can be moved into a position that projects further in front of the guide contour 965C or into a farther retracted position, in particular behind the same, by arranging the actuators 986 on the coating tools 981 and/or the erasing device 985. The actuators 986 can be controllable by the control device 32 in a wireless or wired manner not shown herein.

[0296] Further exemplary embodiments are outlined in connection with FIG. 12. For example, cutting tools can also be attached to the housing 64 and/or a coating device relative to the guide device 65, in particular to the guide contour 65C, such that they are kept floating and/or movable, for example by means of the bearing device 66.

[0297] For example, instead of the plate work tool 90, a milling head or similar other cutting work tool can be driven by the drive motor 53. For example, instead of the connection to the eccentric 57, a tool holder 58F can be provided directly on the drive motor 53, to which the work tool 90F, for example a milling head, drill or the like, can be fastened directly. To adjust the work tool 90F relative to the carrier 60, the actuator 954 already explained above and shown schematically in the drawing can be provided.

[0298] As an alternative or in addition, at least one coating tool 981 can also be arranged on the carrier 60. The coating tool 981, for example one of the coating heads 981A and/or 981 B, can be arranged in a stationary manner on the carrier 60 or, by means of an actuator 986, can be movable between a position that projects further in front of the guide contour 65C or a position that is further set back with respect to the guide contour 65C, in particular one that is set back behind the guide contour 65C.