Mobile machine tool with movably mounted tool

Abstract

The invention relates to a mobile machine tool (51) for the coating and / or abrasive machining of a surface (FL, FR, FF, FD) of a workpiece or a room (RA) with a working device (50) that is mobile in relation to the surface (FL, FR, FF, FD) and has a tool holder (58), which is or can be driven by a drive motor (53), for a working tool (90A, 90F) for machining the surface and / or a coating means (980) having a coating tool (981) for coating the surface (FL, FR, FF, FD). According to the invention, the working device (50) has a guiding means (65) having at least one guiding contour (65C), in particular a guiding face, for guiding on the surface (FL, FR, FF, FD), wherein the working tool (90A, 90F) or the coating tool (981) is mounted movably in relation to the guiding means (65).

Description

[0001] The invention relates to a mobile machine tool for coating and / or abrasive processing of a surface of a workpiece or a space according to the preamble of claim 1.

[0002] One such machine tool is described, for example, in EP 2 202 029 A2.

[0003] The machine tool in question is, for example, a grinding machine, equipped with either a grinding tool or a disc tool for surface processing. Disc tools typically have flexible pads, such as those made of foam, allowing them to adapt to the contours of the surface being machined. The machine tool is guided along the surface by the working surface of the disc tool. A seal, such as a brush seal, may be provided around the disc tool, resting against the workpiece surface. This enables effective dust extraction.

[0004] Nevertheless, the guiding characteristics of the known machine tool on the workpiece surface or the room surface are not optimal.

[0005] It is therefore the object of the present invention to provide an improved machine tool.

[0006] To solve the problem, a mobile machine tool according to the technical teaching of claim 1 is provided.

[0007] The basic principle is that the guide device essentially slides or guides along the workpiece surface, while the machining surface of the disc tool or other working tool is movable relative to the guide contour, allowing it to compensate for unevenness on the surface being machined. Of course, it is possible to use a disc tool with a flexible machining surface on the machine tool. However, the movable mounting of the working tool or coating tool allows for additional degrees of freedom and thus optimal workpiece machining.

[0008] The coating tool is, for example, a roller or cylinder that is movable relative to the surface.

[0009] The work device expediently includes a guide element with at least one guide contour, for example a guide surface, for guiding along the surface of the space or workpiece. The guide contour expediently has a flat shape. The guide contour can, for example, lie in a plane. The guide contour can be elastic or compliant. However, it is also possible for the guide contour to be or comprise a rigid, non-compliant contour.

[0010] The working tool or coating tool is advantageously mounted so that it can move freely relative to the guide device. This allows, for example, the guide contour to follow the surface, while the working tool or coating tool can follow any unevenness of the surface being processed. It is also possible, of course, for the disc tool to have a certain degree of flexibility, for example, a foam layer that adapts to or follows the respective surface contour.

[0011] It is possible that only the working tool or the coating device, in particular the coating tool, is movably mounted relative to the guide device. However, it is also possible that the entire working device is movably mounted relative to the guide device. For example, the working device can form a drive unit or a drive head that is movably mounted relative to the guide device.

[0012] The movable mounting of the working device, its working tool, or the coating unit relative to the guide device allows, for example, the working device, the working tool, or the coating unit to be mounted on the guide device by means of a bearing assembly so that it can be mounted linearly and / or pivotally about at least one guide contour, for example, pivotally in multiple axes or floating. A floating mounting is to be understood in particular as multi-axis pivotability. The bearing assembly preferably mounts the working tool, the coating unit, or the working device as a whole so that it can pivot about at least one pivot axis that runs transversely to a rotational axis of the working tool or to the force component oriented perpendicular to the surface. A gimbal or ball-joint mounting is advantageous, for example.

[0013] An advantageous bearing concept provides that the bearing device comprises at least one membrane on which the working tool, coating device, or work fixture as a whole is held on the guide device. For example, the membrane is held on the guide device with its edge region and supports the working tool, coating device, or work fixture as a whole, which is arranged inside the guide device.

[0014] The movable mounting of the working tool and / or coating unit relative to the guide also allows them to be moved into a kind of parking position, which is useful when the work device is stationary relative to the surface being processed, for example, for pre-positioning before the actual work process begins or during work breaks. In such cases, surface treatment, such as coating, abrasive processing, or the like, is neither possible nor advisable. Both could lead to damage or destruction of the surface.

[0015] A preferred concept therefore provides that the working tool or a coating tool of the coating device is adjustable relative to the guide contour of the guide device between a working position intended for contact with the surface and a rest position set back from the at least one guide contour. In the rest position, the guide contour is in contact with the surface, while the working tool or coating tool is at a distance from the surface. The rest position is suitable, for example, for pre-positioning the working device on the surface.

[0016] It is possible for the working tool or coating tool to be manually adjustable between its rest position and working position by an operator. Preferably, the working device has an actuator for adjusting the working tool or coating tool between its rest position and working position. The actuator can, for example, comprise a lever mechanism that is manually operated. Preferably, however, the actuator is motorized, in particular electric motorized. This allows, among other things, automation.

[0017] The working tool or coating tool is biased into a working position, intended for contact with the surface, relative to the guide device by a spring arrangement. Thus, the spring arrangement, which comprises one or more springs, in particular coil springs, leaf springs, or the like, holds the working tool or coating tool in contact with the surface being processed. It is possible that the aforementioned actuator moves the working tool or coating tool into its rest position against the force of the spring arrangement.

[0018] According to the invention, the guide device comprises a guide carrier on which a support body, for example a sealing element, a rubber seal, a brush seal, or the like, is movably mounted. The support body has at least one guide contour and is designed to bear against the surface to be processed. The guide device thus comprises a rigid guide carrier on which the working tool, coating device, or the entire working apparatus is movably mounted. Advantageously, the support body is spring-loaded with respect to the guide carrier in the direction of the surface to be processed by a spring arrangement. An embodiment of the invention provides that the support body is mounted in a floating manner with respect to the guide carrier, so that it can pivot in multiple axes with respect to the guide carrier. In this situation, spring loading is optional but not strictly necessary.

[0019] The guide contour advantageously surrounds the working device in a ring shape. The guide contour can be elastic or rigid. It can be formed by one or more contact elements, in particular plates, sealing elements, or the like.

[0020] The guide device expediently has at least one suction area for drawing air from the surface to be processed. The suction area can be located, for example, laterally next to the working tool or coating tool. The suction area can surround the working tool or coating tool in a ring-shaped or partially ring-shaped configuration.

[0021] However, it is also possible that the work device adheres to the surface being processed by means of suction, so to speak, via the working tool. A suction area on the guide device and another suction area on the working tool or coating tool are perfectly feasible.

[0022] The machine tool preferably forms a mobile working device of a surface processing system for coating and / or abrasively processing the surface of a workpiece or a space. The working device is mobile with respect to the surface.

[0023] It is advantageously provided that the surface processing system has at least one holding device that can be fixed in position relative to the surface and that is connected to the working device by means of at least one flexible tensioning element.

[0024] The flexible tensioning element can be, for example, a rope, a toothed belt, or the like. The flexible tensioning element is suitable, for instance, for positioning and / or supporting the work device relative to the surface being processed. For example, the flexible tensioning element can prevent or at least slow down the work device from falling onto a surface.

[0025] The working tool is preferably a disc tool and / or a grinding tool. For example, a grinding belt, grinding disc, or the like may be used as the working tool. However, the working tool may also be a milling tool or other similar cutting tool.

[0026] The drive motor with which the tool holder is driven or can be driven is preferably designed or configured for rotary driving of the tool holder about a rotary axis and / or for eccentric rotary driving of the tool holder. It is possible that the working device can be switched between an eccentric mode, in which the tool holder and thus the working tool undergo eccentric movements, and a pure rotation mode, in which the working tool only rotates about a rotary axis but does not exhibit any eccentricity.

[0027] The coating tool could be, for example, a spray device for applying paint. However, the coating tool could also include, for example, a roller or similar application body for applying paint or similar coatings to the surface of the workpiece or the room.

[0028] Instead of or in addition to the tool holder driven by the drive motor or the coating unit, the working device can also include a cleaning unit. Thus, the working device can, in effect, constitute a cleaning unit. The cleaning unit can, for example, include a brush arrangement for brushing the surface and / or one or more nozzles for dispensing a cleaning fluid or the like. It is possible that the cleaning unit could, for instance, be a high-pressure cleaning unit.

[0029] The holding device, which can be fixed to a specific surface, is connected to the working device by means of one or more flexible tension members. These members can, for example, prevent the working device from falling to the ground or keep it attached to a wall or other surface. The tension member can, in effect, assist the suction device.

[0030] The tensioning element can, for example, compensate for the weight of the working device. The working device can thus be suspended from the tensioning element, so to speak. For instance, the tensioning element may be spring-loaded by a spring assembly, so that the spring assembly fully or partially compensates for the weight of the working device. The spring assembly can act directly on the tensioning element and / or load a winding body onto it, causing the tensioning element to wind up.

[0031] Preferably, the surface processing system includes a positioning device with at least one positioning drive for positioning the working device transversely to the normal direction of the surface.

[0032] Preferably, several positioning drives are provided for multiple degrees of freedom and / or directions of movement.

[0033] The at least one positioning drive can, for example, assist the operator who would otherwise manually operate the work device. The basic idea is that, with the support of the at least one positioning drive, the operator positions the work device transversely to the normal direction, in particular multi-axis or two-axis transversely to the normal direction.

[0034] At least one positioning drive is advantageously arranged on board the work device. For example, the positioning drive comprises a drive roller driven by a drive motor for rolling on the surface of the workpiece or space to be machined.

[0035] Autonomous surface processing, such as coating or abrasive surface treatment, is readily possible with at least one positioning drive. The surface processing system operates independently and therefore requires no direct input.

[0036] A preferred embodiment of the invention provides that one or more of the positioning drives are arranged on the holding device and actuate the pulling element. Thus, the holding device has one or more positioning drives for the at least one pulling element. This positioning drive of the holding device can be provided additionally or instead of a positioning drive on board the working device. It is further advantageous if the surface treatment system has at least two or at least three, and preferably at least four, pulling elements. It is also advantageous for the holding devices to have two, at least three, or even four holding devices. The holding devices can, for example, be arranged in corner areas of the surface to be treated, so that the working device can be maneuvered between the holding devices. Each holding device is assigned one pulling element.It is also possible for several pulling elements to be attached to a single holding device. This allows, for example, a higher pulling force to be achieved. With multiple holding devices, such as three or four holding devices and corresponding pulling elements extending between the holding device and the working device, the working device can be easily maneuvered on the surface of the workpiece or in the space to be machined.

[0037] The working device preferably has several pull-element holders for holding at least one pull-element. These holders are preferably assigned to different directions of force with which the pull-elements act on the working device. It is preferred, for example, that the pull-element holders are spaced at equal angular intervals. The pull-element holders can be designed or configured for a fixed, permanent, or detachable connection between the pull-element and the working device.

[0038] For the pulling element holders, it is advantageous if they allow for snap-fit ​​connections and / or magnetic connections and / or clamp connections and / or hook connections or the like with the respective pulling element. For example, snap-fit ​​receptacles and / or snap-fit ​​projections and / or magnetic holders and / or bayonet contours or the like can be provided on a respective pulling element holder, which can be brought into a fixed, preferably releasable, connection with corresponding, complementary connecting means at the respective longitudinal end of a pulling element. Naturally, it is advantageous if the pulling element holders allow movement, for example, pivoting, of a respective pulling element relative to the working device. For example, pivot bearings can be provided on the pulling element holders.However, it is also possible that, for example, eyelets or similar features or other receiving contours are present that allow a range of motion for the respective pulling element with respect to the working device.

[0039] The at least one positioning drive expediently comprises at least one drive element for powering the drive element. The drive element can be arranged, for example, on board the working device, on the holding device, or the like. It is possible that a drive element is present on both the holding device and the working device. The drive elements preferably operate together.

[0040] It is possible that the at least one positioning drive includes or is formed by at least one work device drive arranged on board the work device. In the latter configuration, for example, a traction element drive may be supported by the work device drive. It is also possible that the traction element drive and the work device drive are assigned different directions of movement, for example, directions of movement that are perpendicular to each other, particularly perpendicular. For example, the traction element drive may be designed for forward or reverse movement of the work device along the surface to be machined, while the work device drive is designed and / or configured for positioning movements transverse to it.

[0041] In principle, it is possible for a tensioning element that is not active with respect to its force direction to sag, for example. It is also possible for a tensioning element to be spring-loaded by a spring arrangement, so that it is held under tension between the holding device on one side and the working device on the other.

[0042] Preferably, a winding device is provided for winding the tensioning element. The winding device is preferably motor-driven or spring-loaded. However, the winding device can also be manually operated, for example, by a crank or similar operating handle.

[0043] It is further advantageous if a positioning drive, or the positioning drive that actuates a traction element, is arranged between the working device and the at least one winding unit. If, for example, the traction element has a toothed belt or toothed belt section, the positioning drive can precisely influence a specific longitudinal position of the traction element.

[0044] Alternatively, it is easily possible to provide the positioning drive on the winding device or to design it as a rotary drive for a winding roll.

[0045] It is possible that in the case of a winding body, for example a winding roll, the winding device is equipped with a position sensor to detect the respective wound or unwound section of the pulling element via the positioning drive.

[0046] For precise length or path determination of a wound or unwound section of the traction element by measuring the revolutions of a winding body, particularly a winding roll, it is advantageous to determine the respective winding status, so that the influence of the respective winding diameter on the length of the unwound section of the traction element is recorded during rotation of the winding body. For this purpose, an optical sensor, a camera, or similar device can be used, for example.

[0047] In connection with the winding and unwinding of the tensioning element, it has already become clear that it is advantageous if the tensioning element does not sag. It is advantageous if at least one tensioning element, for example a tensioning roller or the like, is provided to tension the tensioning element. The tensioning element is expediently spring-loaded. The tensioning element can, for example, be arranged between the winding device and the working device.

[0048] Furthermore, it is possible for the tensioning element, for example a tension roller, to be arranged between a tensioning element drive and the winding device that winds and unwinds the tensioning element. This allows, for example, precise winding and unwinding of the tensioning element from a roller or other winding body of the winding device.

[0049] Furthermore, a guide device for the pulling element is advantageous, comprising a guide body for guiding the at least one pulling element. The guide body can be fixed or movable, for example, on the holding device. The guide body may include, for example, a guide eye, a guide roller, a guide groove, or the like.

[0050] The guide body for the pulling element is advantageously arranged on a joint, for example a ball joint, a swivel joint, a universal joint, or the like, wherein the joint movably supports the guide body. The guide body can follow the movements of the pulling element by means of this articulated support. For example, the joint is provided on the at least one holding device. The joint can be located, for example, at a longitudinal end region of the holding device. It is also possible for the joint to be fixed in position independently of the holding device with respect to the surface to be machined, for example by means of a suction device, a screw connection, a clamping mechanism, or the like.

[0051] The guide body for the pulling element is advantageously arranged between a winding device for the pulling element and / or a drive for the pulling element and the mobile working device. Thus, the guide body for the pulling element guides the pulling element, for example, between the winding device and the working device, or between the drive for the pulling element and the working device.

[0052] Various methods are suitable for the stationary fixing of the holding device. For example, a vacuum clamp or similar vacuum holding device can be used to fix the holding device relative to the space being worked on. A clamping of the holding device between opposing surfaces, such as the floor and ceiling of the room, is preferred. For example, the holding device can be clamped between the floor and ceiling in the manner of a strut, or be clampable in this way.

[0053] Preferably, the holding device is longitudinally adjustable between at least two positions, in which the longitudinal ends of the holding device are at different distances from each other. The longitudinal ends then rest, for example, on the floor and ceiling of the room. The holding device can be fixed in each longitudinal position, for example, by means of a clamping device, a screw thread, or similar other fixing device.

[0054] The holding device includes, for example, a type of stand or support.

[0055] The holding device comprises, for example, a holding base and a support body, which can be fixed relative to each other in at least two longitudinal positions of the support body with respect to the holding base. For example, the support body is telescopically extendable at or with respect to the holding base. It is understood that several telescopically adjustable components of the holding device may be provided.

[0056] The working device is preferably housed in an intake housing. The intake housing is designed to draw suction to the surface. The intake housing can completely enclose or encapsulate the working device. For example, the aforementioned guide contour for guiding the device along the surface to be machined is arranged on an edge or end face of the intake housing. The intake housing can, for example, be designed in the form of a bell. A vacuum chamber is preferably provided within the intake housing, in which the working device is housed.

[0057] Preferably, the surface treatment system has a vacuum generator separate from the work device, which is connected to the work device by means of a suction hose. The vacuum generator is, for example, a vacuum cleaner. It is advantageous if the surface treatment system's control unit is located on board the vacuum generator. The vacuum generator can, for example, be stationary in a room, while the work device is mobile and positioned along the surface to be treated. The control unit or control device on board the vacuum generator can, for example, control positioning drives on board the work device or on one or more of the holding devices.

[0058] Preferably, the working device has a suction control or a regulating device, or both, for setting a vacuum in a suction area provided for drawing the working device to the surface. For example, the vacuum generator arranged on board the working device can be controlled or regulated accordingly. For example, a pressure sensor is provided in the suction area.

[0059] Advantageously, the intake device has at least one valve for controlling an intake air flow and / or a vacuum in an intake area of ​​the working device for suction to the surface, wherein the at least one valve has a valve element which is adjustable between at least two valve positions in which a flow cross-section of the valve is different.

[0060] To solve the problem, a mobile machine tool of the type mentioned above is provided for in that the suction device has a suction control for adjusting the valve element during operation of the working tool or the coating device between its valve positions depending on at least one physical quantity.

[0061] The basic principle is that the intake control, which can also be described as an actuator, dynamically adjusts the valve element while the working tool or coating tool processes the surface, for example, by abrasives or coating. The valve element can be actuated or is actuated without direct operator intervention, namely by the intake control.

[0062] For adjusting the valve element, a valve actuator, a spring assembly, or both may be provided. It is also entirely possible for the valve to have a manually operated handle for actuating the valve element. Thus, the valve element, which is driven by a motor or spring assembly, can also be operated manually.

[0063] The manual operating handle can also be used to change the preload of the spring assembly, for example to adjust the valve to a different operating range.

[0064] The at least one physical quantity includes, for example, the angular position of the working device relative to a surface. The suction control adjusts the valve element depending on the valve position of the working device relative to the surface. Therefore, if the working device assumes a vertical working position, for example, for machining a side wall surface, the valve element has a different position than when machining a surface on the floor or a ceiling surface.

[0065] To determine the angular position, the intake control system can include a position sensor. The position sensor is designed to detect the angular position of the working device relative to a surface as at least one physical quantity. The position sensor can be an acceleration sensor. The acceleration sensor can perform a three-axis acceleration measurement.

[0066] However, it is possible for the valve element to automatically detect the angular position of the working device relative to the surface, or to adjust itself depending on this angular position. For example, the valve element is movably mounted within a valve housing, allowing it to move between at least two valve positions depending on the angular position of the working device relative to the surface. The valve element automatically assumes these valve positions by adjusting the working device to the respective angular position. The valve element comprises, for example, a ball or other rolling element that is movably mounted within the valve housing. Depending on the angular position of the working device, and thus of the valve, the valve element moves within the valve housing to, for example, open or close a valve orifice. It is possible for several such valve elements to be used.

[0067] The at least one physical quantity can also include the motor power or current of the drive motor. Therefore, the at least one physical quantity can also represent the abrasion power or polishing power of a working tool. The intake control is designed to actuate the valve or adjust the valve element depending on the motor power or current. Thus, if the motor delivers higher power, for example, this can be an indicator of high abrasion power, which in turn is due to a high vacuum in the intake area.

[0068] The at least one physical quantity can also include the pressure and / or flow velocity of an intake air stream in the intake area. For this purpose, the intake control system includes, for example, a pressure sensor to detect the pressure and / or a flow sensor to detect the flow velocity.

[0069] It is also possible that the valve element is controlled automatically by the pressure or flow, i.e., that, for example, the valve element is spring-loaded in the direction of a closing position and can be opened by negative pressure, or is spring-loaded in the direction of an open position and is closed by negative pressure.

[0070] Preferably, the intake control system includes a control device for regulating a vacuum in the intake area as a function of at least one physical quantity. The control system can, for example, take as its input a pressure signal or flow signal from a pressure sensor or flow sensor. On the output side, the control device, for example, actuates a motorized valve actuator to operate the valve element.

[0071] The valve allows the intake control system to adjust or regulate the intake airflow drawn through the intake area during machine tool operation. It can also be used for external air control, meaning that external air can flow into the intake area or any other low-pressure area connected to it, thereby altering the negative pressure or flow velocity of the intake airflow within the intake area – for example, increasing or decreasing it.

[0072] It is entirely possible for the intake system to have at least one additional manually operated valve for influencing the vacuum and / or the intake airflow in the intake area. This valve is therefore present in addition to the valve operated by the intake control system. For example, the operator of the machine tool can use this valve to open, close, or partially open an external air inlet. This allows, for instance, the operating range of the valve operated by the intake control system to be modified.

[0073] The work device can include a support tool with a support surface or machining surface for contact with a workpiece surface, for example, a wall surface. This support tool can be designed and constructed in the same way as the disc tool described below, i.e., it can have, for example, intake air inlet openings and / or auxiliary air inlet openings as well as associated outlet openings.

[0074] Machining heads, such as coating heads of the coating device, milling tools or other machining tools for machining the workpiece to be machined, can be arranged on the support tool.

[0075] The working tool is preferably a disc tool for machining the surface and a drive motor for driving the disc tool, which has a machining surface associated with machining a workpiece and a machine side opposite the machining surface, wherein intake air inlet openings are arranged on the machining surface for drawing air to the surface to be machined, which are flow-connected to at least one intake air outlet opening arranged away from the machining surface on the disc tool, wherein the disc tool has at least one additional air inlet opening for the flow of additional air, which is flow-connected to at least one additional air outlet opening arranged away from the machining surface.

[0076] The intake device is preferably designed to generate an intake air flow and / or a negative pressure at the at least one intake air outlet opening and the at least one additional air outlet opening.

[0077] Advantageously, the intake device is provided with an intake control system for controlling the intake air flow and / or the negative pressure in the area of ​​at least one additional air outlet opening.

[0078] The basic idea is that the intake airflow or the negative pressure, or both, can be adjusted in the area of ​​the auxiliary air outlet, so that, for example, the at least one auxiliary air inlet can be activated as an additional inlet opening that draws the machine tool to the surface, and / or to change the overall suction capacity of the intake system between the at least one auxiliary air inlet and the intake air inlets. For example, this allows for a higher suction capacity in the area of ​​the intake air inlets located on the machining surface.

[0079] Preferably, an abrasive for machining a workpiece or a holding means for releasably holding such an abrasive is arranged on the machining surface. It is possible that both are provided, namely that a holding means is present to which an abrasive is attached.

[0080] The abrasive and / or the holding device expediently has through-openings corresponding to the intake air inlets, so that air can be drawn in from the front or working side of the abrasive or the holding device through the through-openings into the intake air inlets. The holding device for releasably holding the abrasive expediently comprises a hook and loop arrangement, for example hook and loop hooks, a hook and loop felt, or the like.

[0081] Preferably, a mounting bracket, such as a projection, a retaining pin, a bayonet profile, or the like, is located on the machine side of the disc tool for attachment to a tool holder of the work device. Therefore, it is advantageous if the disc tool is detachably mounted on the work device. This allows, for example, the disc tool to be replaced if the retaining element or the abrasive becomes worn.

[0082] The tool holder or the disc tool is directly connected to the drive motor, for example in the form of a direct drive, or motion-coupled, for example by means of a gearbox and / or an eccentric bearing or the like.

[0083] The intake control system is advantageously designed to control the intake airflow and / or the vacuum in the area of ​​at least one intake air outlet. Therefore, it is possible to directly adjust the vacuum or intake airflow in the area of ​​the intake air inlets. For this purpose, a valve is provided, for example, which can adjust the vacuum or intake airflow in the area of ​​the intake air outlet.

[0084] However, it is also possible that the intake airflow and / or the vacuum in the area of ​​the at least one intake air outlet cannot be influenced by the intake control system, or can only be influenced by controlling the intake airflow or the vacuum in the area of ​​the at least one auxiliary air outlet. Thus, the intake performance that is fundamentally available is indirectly adjusted by setting the vacuum or the intake airflow in the area of ​​the at least one auxiliary air inlet.

[0085] It is possible that a substantially constant or constant intake airflow or a substantially constant or constant negative pressure is available in the area of ​​the at least one intake air outlet. However, it is also possible that by changing the intake airflow or the negative pressure in the area of ​​the at least one auxiliary air outlet, and thus also changing the flow conditions and / or pressure conditions in the area of ​​the auxiliary air inlet or inlets, the flow conditions and / or pressure conditions in the area of ​​the intake air inlets can be altered, preferably providing a primary or main intake for the disc tool and thus for the machine tool.

[0086] The suction device includes, for example, a vacuum generator for creating a vacuum and / or an intake airflow, which is arranged on the working device, for example, on its housing. However, it is also possible, in addition to or as a replacement for the aforementioned vacuum generator, for the suction device to have a suction port arranged on the working device for a vacuum generator that is separate from the working device or machine tool, and in particular located at a distance. This vacuum generator is, for example, a vacuum cleaner. A flexible flow line, for example, a suction hose, can be connected to the suction port. The suction port can thus be provided, for example, for connecting a suction hose of the vacuum cleaner or vacuum generator. The suction port is preferably a connecting nozzle or a sleeve.

[0087] Preferably, the intake control system has at least one valve for controlling the intake air flow and / or the vacuum in the area of ​​the at least one intake air outlet and / or in the area of ​​the at least one auxiliary air outlet, wherein a valve inlet of the valve is connected to the at least one intake air outlet and / or the at least one auxiliary air outlet, and a valve outlet of the valve is connected or connectable to a vacuum generator. Thus, without changing the suction capacity of the vacuum generator, the pressure conditions and / or flow conditions in the area of ​​the at least one intake air outlet or the at least one auxiliary air outlet can be adjusted by means of the valve.

[0088] The valve is arranged, for example, in a flow channel between at least one intake air outlet or the auxiliary air outlet, or both, and the vacuum generator or the suction port for the vacuum generator, and is thus connected between the respective outlets and the vacuum generator. The valve element of the valve element is adjustable between, for example, a closed position that closes the flow channel and a free position that opens the flow channel, and preferably at least one intermediate position between the closed position and the free position.

[0089] The valve may include, for example, a control valve, a switching valve, or the like. The valve can be switchable between a flow-through position and a blocking position to block a flow connection between the vacuum generator and the outlet openings of the disc tool. However, the valve may also be able to switch intermediate positions between such a flow-through and blocking position, or it may be partially or fully openable. For example, the valve may be a proportional valve.

[0090] Preferably, the valve element is mounted so as to be rotatable, slidable, and / or pivotable between the at least two valve positions relative to the valve housing. The axis of rotation or pivot of the valve element can, for example, run parallel to the main flow axis of the valve, or at a slight angle to it, for example, a maximum of 10° or 15°. It is also possible for the axis of rotation or pivot of the valve element to run transversely to the main flow axis of the valve, for example, at a right angle. A superimposed pivoting and sliding movement of the valve element is readily possible.

[0091] The valve element comprises, for example, a cylindrical body with at least one recess on its outer circumferential wall. Several recesses may be provided on the circumferential wall, for example, at longitudinal and / or angular intervals. To change the flow cross-section of the valve, the circumferential wall, and thus the at least one recess on the circumferential wall, is adjustable relative to a valve housing.

[0092] Preferably, the valve has a motorized actuator and / or a spring assembly and / or a manually operated handle for adjusting the valve element. Combinations are possible, i.e., for example, a manually operated valve element may also be spring-loaded. A valve that is inherently motorized or spring-driven can also be manually operated without difficulty.

[0093] It is advantageous if the valve element is actuated or actuable depending on the angular position of the working device relative to a surface. For example, the valve element can be movably mounted in the valve housing and actuated by gravity in such a way that, depending on the angular position of the working device, it changes the flow cross-section of the valve, for example, opening or closing, reducing or increasing it. The valve element can, for example, open a passage of the valve when working on a ceiling surface, partially or completely close the passage when working on a side wall of a room, and completely close the passage when working on a floor surface.

[0094] Advantageously, a fixing device, for example a locking device and / or a clamping device and / or at least one magnet, is provided for fixing the valve element in at least one valve position.

[0095] The locking mechanism can, for example, comprise locking contours on the valve element, in particular its manual operating handle, and a component that is fixed in position relative to the valve housing. Thus, when the operator actsuates the operating handle, the locking contours can engage with each other in predetermined positions.

[0096] A clamping device can, for example, include a spring arrangement or a clamping disc, or be formed in such a way that, for example, the valve element is correspondingly stiff.

[0097] A magnetic holder can, for example, provide a magnet on the valve element, which, together with another magnetic element, such as a magnet or a ferromagnetic component that is stationary relative to the valve housing, achieves a magnetic hold.

[0098] It is preferred that the valve element can be locked or fixed in predetermined valve positions, in which, for example, specific flow conditions or vacuum distributions between the intake air inlet openings on the one hand and the auxiliary air inlet openings on the other hand can be adjusted. For example, one predetermined position of the valve element can be provided for wall machining by the machine tool, while another position is provided for ceiling or floor machining. For ceiling machining, the valve element is, for example, in a valve position such that the flow cross-section of the valve is larger than for wall machining.

[0099] Thus, for example, more intake air or negative pressure may be present in the area of ​​the intake air inlet openings. Conversely, it is also possible that the valve element releases a larger flow cross-section during surface machining, namely when additional air is to flow through additional air inlet openings not arranged to draw the disc tool to the surface, for example, inlet openings located on the outer circumference of the disc tool, so that the suction power in the area of ​​the intake air inlet openings is correspondingly lower.

[0100] In a preferred embodiment of the invention, the valve element is spring-loaded in the direction of a closing position and can be actuated by negative pressure in the direction of its open position. For example, negative pressure in the area of ​​the at least one auxiliary air outlet can open the valve element in the direction of its open position against the force of a spring arrangement that springs the valve element into the closed position. It is also possible, however, for negative pressure on the downstream side to open the valve element, so that negative pressure can be generated in the area of, for example, the intake air outlets or the auxiliary air outlets.

[0101] One embodiment of the invention provides that at least one bypass channel connected to the at least one extraction air outlet is provided past the at least one valve. However, it is also possible that extraction air from the at least one extraction air outlet always flows through the bypass channel or an arrangement of several bypass channels past the valve(s) towards the vacuum generator or a suction port for the vacuum generator, i.e., that the valve merely influences the flow conditions or pressure conditions in the area of ​​the at least one auxiliary air intake opening.

[0102] The additional air inlet openings can be provided in different areas of the disc tool.

[0103] One embodiment, for example, provides that the at least one additional air inlet opening comprises or is formed by an additional air inlet opening arranged on the machining surface. Naturally, several additional air inlet openings can be arranged on the machining surface. The additional air inlet opening on the machining surface makes it possible to directly influence the suction force of the disc tool against the surface being machined.

[0104] Preferably, the at least one additional air inlet opening, or all additional air inlet openings, are arranged on a radial outer circumference of the disc tool. The intake air inlet openings are therefore preferably arranged in a central area of ​​the disc tool, while the additional air inlet opening(s) are arranged at the edge of the disc tool.

[0105] It should be noted that the disc tool preferably has a circular or oval circumference. In particular, the disc tool is designed for rotary actuation by the drive motor. However, it is also possible for the disc tool to have, for example, a triangular, rectangular, or square contour. For instance, the disc tool can be used in a configuration of the work device as an orbital sander or oscillating sander, or for oscillating surface grinding. However, a configuration of the work device as a rotary sander and / or as an eccentric sander is preferred.

[0106] Preferably, the at least one additional air inlet opening comprises or is formed by an additional air inlet opening arranged on an outer circumference of the disc tool, in particular on an outer edge region of the disc tool, between the machine side and the machining surface. Thus, dust and other similar particles from the vicinity of the disc tool can be drawn in via the additional air inlet opening on the outer edge region, in particular on the outer circumference region, of the disc tool. This facilitates dust-free or low-dust operation.

[0107] Preferably, the disc tool has an annular arrangement of inlet openings extending around an axis of rotation or around a central axis of the disc tool that is orthogonal to the machining surface. The at least one auxiliary air inlet opening and / or the intake air inlet openings form part of the arrangement of such inlet openings. It is understood that several, in particular concentric, annular arrangements of inlet openings, i.e., auxiliary air inlet openings or intake air inlet openings, may be provided.

[0108] The inlet openings of each arrangement of inlet openings are expediently arranged at equal angular intervals from one another. A ring arrangement of inlet openings, for example, has inlet openings at equal angular intervals.

[0109] Furthermore, in a preferred embodiment, the arrangements of auxiliary air inlet openings and intake air inlet openings are arranged concentrically with respect to the axis of rotation or central axis of the disc tool.

[0110] The exhaust openings are advantageously located on the machine side of the disc tool. For example, at least one intake air exhaust opening and / or at least one auxiliary air exhaust opening are arranged there.

[0111] It is preferred if one or more auxiliary air inlets are associated with each auxiliary air outlet. Similarly, it is advantageous for each intake air outlet to be associated with one or more intake air inlets.

[0112] It is further preferred if several intake air outlet openings and / or several auxiliary air outlet openings are present. In particular, these are designed or arranged in ring configurations. For example, it is advantageous if the disc tool has an annular arrangement of outlet openings extending around a rotational axis or around a central axis of the disc tool orthogonal to the machining surface, wherein the at least one intake air outlet opening and / or the at least one auxiliary air outlet opening forms part of such an arrangement of inlet openings.

[0113] In ring arrangements of outlet openings, it is also advantageous if the outlet openings are arranged at equal angular intervals. Furthermore, in these arrangements, it is also advantageous if the arrangement of auxiliary air outlet openings and the arrangement of intake air outlet openings are concentric with respect to the axis of rotation or central axis of the disc tool. For example, the intake air outlet openings can be located radially inward with respect to the axis of rotation or central axis, and the auxiliary air outlet openings radially outward.

[0114] Preferably, the intake device has separate inlets for the auxiliary air outlet and the intake air outlet, or the respective arrangement thereof. For example, the intake device has one intake air inlet associated with the at least one intake air outlet and one auxiliary air inlet associated with the at least one auxiliary air outlet.

[0115] The intake air inlet or the auxiliary air inlet, or both, can have an annular or semi-annular geometry. It is possible that one of the inlets is designed as a chamber or intake chamber around which the other inlet extends in an annular or semi-annular shape.

[0116] The intake air inlet and the auxiliary air inlet are advantageously arranged in a ring shape around a rotational axis or a central axis of the disc tool. Preferably, the auxiliary air inlet and the intake air inlet are concentric with respect to the rotational axis or central axis.

[0117] The intake air inlet and the auxiliary air inlet can be at least partially connected. For example, it's possible that, so to speak, false air flows from one inlet to the other. This can be acceptable if the intake system or vacuum generator has sufficient suction capacity.

[0118] It is preferred, however, if the intake air inlet and the auxiliary air inlet are flow-separated from each other by at least one seal, for example, an annular seal. The at least one seal expediently extends in an annular shape around the axis of rotation or central axis of the disc tool. The at least one seal preferably rests in the sealing seat or seals against the machine side of the disc tool. Concentric seals are preferred, so that, for example, an annular auxiliary air inlet or intake air inlet is limited by the seals.

[0119] The at least one seal can be, for example, a rubber seal or an elastic seal. The at least one seal can also be, for example, a brush seal.

[0120] A preferred concept provides that the at least one seal, with respect to a rotational or central axis of the disc tool, comprises a radially outer seal and a radially inner seal, which are designed and / or configured to abut the machine side of the disc tool. The two seals define an annular chamber extending around the rotational or central axis of the disc tool and a central chamber enclosed by the annular chamber and fluidically separated from the annular chamber by the radially inner seal. It is possible that the annular chamber forms the auxiliary inlet and the central chamber the intake air inlet. However, it is also possible that the annular chamber forms the intake air inlet and the central chamber the auxiliary air inlet, or that they are assigned to their respective inlets.

[0121] The machine tool is preferably a manually operated or gripped work device. One embodiment of the invention may provide that a handle, particularly a rod-shaped one, is arranged on the work device for gripping by an operator. The handle is preferably pivotably or rotatably mounted on the work device about at least one pivot axis, preferably about at least two pivot axes that are angled to each other. For example, a cardan bearing or a ball bearing may be provided between the handle and the work device.

[0122] Another concept provides for a machine tool with a positioning device comprising at least one positioning drive for positioning the workpiece transversely to the normal direction of the surface. For example, an electric drive, with which the workpiece performs a movement along the surface, can be provided on the workpiece. A drive roller or drive wheel, for instance, can be provided on the workpiece. Furthermore, it is advantageous if the workpiece has at least one holding device that can be fixed in position relative to the surface and is connected to the workpiece by means of at least one flexible tension member. The tension member can be, for example, a cable, a toothed belt, or the like. The workpiece can preferably be positioned by means of the tension member.However, it is also possible that the pulling mechanism simply serves to prevent the work device from falling to the ground uncontrollably. Furthermore, the pulling mechanism can also serve to assist the operator in the otherwise manual operation of the work device.

[0123] It is preferred that a power supply device for powering the working device is arranged on the handle. For example, the drive motor for the working tool can be powered via the power supply device.

[0124] The handle is advantageously telescopic. Preferably, the handle has a base tube body that engages in an adjustable tube body or engages in the adjustable tube body. Thus, the adjustable tube body is received within the base tube body, or vice versa. It is further advantageous if the two tube bodies can be clamped in at least two different longitudinal positions relative to each other by means of a clamping device, in particular a clamping clamp. The clamping clamp can, for example, comprise a clamping screw, a clamping lever, or the like.

[0125] It is possible that the section between the power supply unit and the working device has a predetermined length and / or is not telescopic. The telescopic section of the handle expediently includes a support body for bracing against the operator's body. The longitudinal position of the power supply unit can be adjusted using the telescopic handle. The longitudinal extension of the support body expediently runs transversely to the longitudinal extension of the handle or the telescopic section of the handle.

[0126] Exemplary embodiments of the invention are explained below with reference to the drawing. The drawing shows: Figure 1 is a perspective view of a surface processing system arranged in a space having at least one surface to be processed; Figure 2 is a side wall of the space according to Figure 1at the two holding devices and the working device of the surface processing system according to Figure 1 Figure 3 shows a schematic view from below of the ceiling of the room in a processing situation for processing the wall surface. Figure 1 with the work device processing the ceiling, Figure 4 a schematic view of a holding device of the surface processing system according to the preceding figures with a positioning drive and a flexible tension member, Figure 5 a holding device of the surface processing system in a first longitudinal position, Figure 6 the holding device according to Figure 5in a second longitudinal position, Figure 7 a first schematic view of a winding device of the surface finishing system according to the preceding figures, Figure 8 a further winding device of the surface finishing system according to the preceding figures, Figure 9 a perspective oblique view of the working device of the surface finishing system, which is shown from above in Figure 10 and from below in Figure 11, Figure 12 a cross-section through the working device approximately along a section line AA in Figure 10 Figure 13 shows a further cross-section through the working device according to Figure 10 along a section line BB, Figure 14 a valve for controlling a negative pressure in an intake area of ​​the working device, Figure 15 a mobile machine tool with a valve of a first type for controlling an intake air flow, Figure 16 a detail X1 from Figure 15with the valve in a different valve position, Figure 17 a top view of the machine tool according to the two preceding figures with a partial section, Figure 18 a detailed view of the valve of the machine tool according to the three preceding figures, Figure 19 a section through the machine tool according to the previous figure approximately along a section line S1-S1, Figure 20 a machine tool with another valve for controlling an intake air flow, which is shown in Figure 21 in partial section and with a different intake control of the valve, Figure 22 a section through the machine tool according to the preceding figure, approximately along a section line S2-S2, Figure 23 a valve element of the valve of the machine according to the preceding figure.Figure 24 shows another machine tool with a valve for controlling the intake air flow, which is shown in Figure 25 in a partial section in a first valve position of the valve and in Figure 26 the same partial section, but with a different valve position of the valve, Figure 27 shows a section through the machine tool of the three preceding figures, approximately along the section line of the partial section, Figure 28 shows a perspective oblique view of the machine tool according to . Figure 27with a rod-shaped handle, of which a telescopic section is shown in perspective in Figure 29 and from the side in Figure 30, Figure 31 a longitudinal section through the arrangement according to the preceding figure, approximately along a section line S3-S3, Figure 32 a machine tool with a further valve for controlling the exhaust air flow, which is shown in perspective from above and in partial section in a first valve position of the valve in Figure 33 and in a second valve position of the valve in Figure 34, Figure 35 a machine tool with a further valve for controlling the intake air flow, which is shown in partial section in Figure 36, wherein the valve assumes a first valve position, Figure 37 a detail X1 from the preceding figure with the valve in another valve position, Figure 38 a sectional view approximately along the partial section plane in the two preceding figures,wherein the valve assumes a flow-through position and Figure 39 a detail X3 from the preceding figure, wherein the valve assumes a closed position, Figure 40 a further working device with a position-dependent valve for controlling the intake air flow, and Figure 41 a working device with a cutting tool and a coating device.

[0127] With a surface treatment system 10, surfaces of a room RA can be treated, for example, a floor surface FB or side wall or wall surfaces FL, FR, FF that are at right angles to each other. The surface treatment system can also treat a ceiling surface FD of the room RA. Treating the side wall surfaces FL, FR, and FF is already strenuous for an operator; treating the ceiling surface FD is even more so. In this situation, the operator has to hold a work device 50 with, for example, an operating rod or similar handle, which is tiring in the long run and, in any case, time-consuming.

[0128] However, with surface treatment system 10, the processing of surfaces FL, FR, FF, FD is more clearly defined.

[0129] The working device 50 is held on flexible tension elements 30A, 30B, 30C, 30D and also adheres to the surface FL, FR, FF, FD to be processed by means of a vacuum 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.

[0130] The vacuum generator 15 is a vacuum generator that is separate and spatially isolated from the working device 50. The vacuum generator 15 is connected to the working device 50 via a flexible suction hose 11. Alternatively or additionally, a vacuum generator 15C located locally on board the working device 50 would also be possible.

[0131] The pulling elements 30A-30D can serve only as a safety measure to prevent the working device 50 from falling to the ground, i.e., falling towards the ground surface FB, in the event of a pressure drop in the vacuum provided by the vacuum generator 15, but can also enable autonomous or semi-autonomous operation, i.e., that the working device 50 can be positioned with respect to the respective surface FL, FR, FF, FD to be processed by means of the pulling elements 30A, 30B, 30C and 30D.

[0132] The vacuum generator 15 is, for example, a vacuum cleaner, meaning that it sucks up particles generated during the processing of a respective surface FL, FR, FF, FD in room RA into a dirt collection container 16. This enables, 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. The suction unit 17, as well as the dirt collection container 16, is mounted on a housing 18. The housing 18 can be stationary on the surface, for example, the surface FB, or it can be freely movable, for example, by means of casters 19. The casters 19 can be undriven, so that the vacuum generator 15 remains stationary in room RA, for example, or can be moved along by the work device 50 as it moves along the surface FL, FR, FF, FD being 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 later, in order to follow the movements of the working device 50.

[0133] The tension members 30A-30D are held by retaining devices 20A-20D. The retaining devices 20 are fixedly arranged in space RA, for example at the respective corner areas of surfaces FL-FD. In the embodiment shown in the drawing according to Figure 1For example, the ceiling of room RA is being processed, i.e., the ceiling surface FD. Accordingly, the holding devices 20A-20D are arranged in the respective inside corners of room A, i.e., at the corner areas of surface FD, so that a large working area or workspace is created for the work device 50, in which the work device 50 can be freely positioned, namely by actuating the pulling elements 30A-30D or also by at least one positioning drive 340A, 340B on board the work device 50. The positioning drives 40A, 40B, 40C, 40D provided for actuating the pulling elements 30A-30D and the positioning drives 340A, 340B form components of a positioning device 13.

[0134] The holding devices 20 can be detachably arranged in space RA, for example by clamping, clamping, or the like. To adapt to the specific spatial conditions of space RA, the holding devices 20 are adjustable, meaning that, for example, their respective longitudinal ends 23, 24 can be clamped to opposing surfaces of space RA, such as the floor surface FB and the ceiling surface FD.

[0135] The holding devices 20 are designed, for example, as struts, telescopic longitudinal supports, or the like. The holding devices have a holding base 21 on which a support body 22 is telescopically mounted. 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 element 26B, for example, a clamp or the like, is adjustable between a fixing position that secures the support body 22 (e.g., locking or clamping) and a release position that releases it, for example, by means of an adjustment movement or locking actuation LO.In the unlocked or released state of the fixing device 25, the support body 22 can, for example, be longitudinally adjustable, as indicated by a double arrow or a longitudinal adjustment LV in the drawing. The fixing device 25 can be or include a clamping device, i.e., that, for example, the support body 22 is adjustable relative to the holding base 21 by means of a screw thread or similar clamping means, so that it can be clamped to the holding device 20, in particular its longitudinal ends 23, 24, between the opposing surfaces FD and FB.

[0136] Each holding device 20A, 20B, 20C, 20D is equipped with a traction element guide device 27A, 27B, 27C, and 27D, respectively, to guide the traction element 30A-30D. The traction element guide device 27 has, for example, a guide body 28, in particular a guide groove and / or a guide roller, on which the traction element 30 is guided. To enable the guide body 28 to follow the movements of the respective traction element 30A-30D, it is preferably movably mounted on a joint 29, movably about at least one pivot axis, and preferably about several pivot axes. The joint 29 is preferably a ball joint, a gimbal joint, or the like.

[0137] Positioning drives 40A, 40B, 40C, 40D are arranged on the holding devices 20A-20D, each acting on and actuating a traction element 30A-30D. For transmitting a traction force, a traction element 30 can, for example, be designed as a cable. However, a toothed belt is preferred, the length of which can be precisely controlled or adjusted between the guide body 28 and the working device 50.

[0138] The positioning drives 40 have drive motors 41 that form traction element drives. The drive motors 41 drive drive rollers, in particular toothed rollers, 42, which rotate about rotary axes D1. The traction element 30 is guided over the drive roller 42, so that a rotary actuation of the drive roller 42 by the drive motor 41 leads to a longitudinal adjustment of the traction element 30 and thus to a positioning of the working device 50.

[0139] The traction element drives 41 are arranged between the guide bodies 28 on one side and a winding body 43 of a winding device 45 on the other. The winding device 45 winds, for example, an unused section or strand of the traction element 30. Preferably, the winding body 43 is spring-loaded by a spring arrangement 44, for example, by a torsion spring. Naturally, the angled body 33, for example, a winding roller or a winding drum, can be driven by a drive motor to wind the section of the traction element 30 between the traction element drive 41 and the angled body 43. The winding body 43 rotates, for example, about a rotational axis D2.

[0140] To determine the length of the section of the pulling element 30 that is moved by the pulling element drive 41 towards the winding device 45, i.e., the section with which the positioning drive 40 pulls on the working device 50, a speed sensor 46 is preferably provided. The speed sensor 46 can, for example, be a component of the drive motor of the pulling element drive, i.e., measure the revolutions of the drive motor. It is also possible for the speed sensor 46 to be arranged, for example, directly on the pulling element 30, where it measures or detects the respective longitudinal adjustment of the pulling element 30, for example, optically, by means of a drive roller, or the like.

[0141] For example, the rotational speed information from the speed sensor 46, or essentially length information about the traction element 30, can be used by the aforementioned control device 32 to control the positioning drives 40A-40D. The control device 32 can comprise or be a control device located on board the vacuum generator 15 and / or on board the working device 50.

[0142] It is also possible that the control device is multi-part, i.e., that parts of its components are located on board the vacuum generator and others on board the working device 50. These parts of the respective control device can communicate with each other.

[0143] The control device 32 can also be or comprise a control device that can be positioned separately from, for example, the vacuum generator 15 in room RA, as schematically indicated in the drawing.

[0144] 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 touch-sensitive screen, or the like, as well as output means 34, for example a screen, indicator lights, or other optical output means and / or acoustic output means, for example a speech output, a loudspeaker, or the like. The control device 32 further comprises a processor 35 for executing program code, 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.

[0145] The control unit 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 section by section into a common line or common communication link 38.

[0146] In this way, the control unit 32 can, for example, control the positioning drives 40A-40D such that it can move the work device 50 between several positions with respect to the respective surface FL, FR, FF, FD to be machined. For example, the pulling elements 30A-30D pull the work device 50 along the ceiling surface FD, with positions P1 and P2 being shown as examples in the drawing. It is readily possible for the work device 50 to move into the corner areas towards the respective guide bodies 28 of the holding devices 20 and also along or to the edge areas of the ceiling surface FD. If, for example, the pulling elements 30D, 30C between the work device 50 and the guide bodies 28 of the holding devices 20D, 20C are particularly long, the work device 50 can, for example, be moved along the edge area of ​​the surface FD between the holding devices 20A, 20B in order to machine the surface FD.

[0147] The working device 50 is freely movable on the surfaces FL, FR, FF, FD of space 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, preferably provided between the vacuum generator 15 and the working device 50, is also 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 routed in or on the suction hose 11, for example, forming part of it. The supply line 12 is, for example, connected to an electrical connection 52A of the working device 50. The supply line 12 provides the working device 50 with electrical energy.For example, a power supply unit 804A can be on board the vacuum cleaner 15, which supplies the working device 50, for example an electronically commutated motor of the same, with electrical energy via the supply line 12.

[0148] The vacuum generator 15 can be connected to a power supply network, for example an AC power network, via an electrical connection cable 14, which has a plug. The power supply network is available, for example, in room RA by means of a socket into which the connection cable 14 or its plug can be inserted.

[0149] For positioning the working device 50 with respect to a side wall, for example the wall surface FL, it is advantageous if a pulling element acts on the working device 50 in several corner areas, for example in the upper and lower corner areas, of the surface FL via a stationary pulling element guide device. A configuration would now be possible in which, for example, the holding devices 20C, 20D are arranged in reverse with respect to their horizontal position in the space RA, so that their respective guide bodies 28 are arranged in the area of ​​the floor or the floor surface FB close to the wall surface FL to be processed. For example, one of the holding devices 20C, 20D can be arranged next to the holding devices 20A and 20B, whose positioning drives 40 can then pull on the working device 50 from below, so to speak, by means of a pulling element 30.

[0150] However, an advantageous concept exists when a second positioning drive, for example a positioning drive 40U, is arranged on each holding device 20, for example the holding devices 20A, 20B. The positioning drive 40U acts on the working device 50 via a traction element 130A, 130B when the latter is active on a side wall surface FL, FR, FF. For example, the positioning drives 40U also comprise the same or similar components as the positioning drives 40, so that, for example, a traction element drive 41U acts on the traction element 130 by means of a drive roller 42U, which can be wound onto a winding body 43U, so to speak, downwind or downstream of the traction element drive 41U.The winding body 43U forms part of a winding device 45U and is, for example, spring-loaded by a spring arrangement 44U to wind the tension member 130, or driven by a drive motor (not shown in the drawing). The respective length of the tension member 130 unwound or adjusted by the tension member drive 41U can be detected by a speed sensor 46U.

[0151] The positioning drives, for example, have communication interfaces 47, 47U, in particular network interfaces (LAN, WLAN or the like), for communication with the control unit 32 via the communication links 38. The communication interfaces 47 can also be, for example, Bluetooth interfaces or include them. An interface 39 of the control unit 32 is designed for communication with the communication interface 47, and thus includes, for example, a LAN, WLAN, Bluetooth interface or the like.

[0152] The positioning drives 40, 40U are, for example, held or arranged on a carrier 48 or a housing 48, which is fixedly fixed to the holding base 21 of a respective holding device 20.

[0153] Instead of a positioning drive 40, 40U, a positioning drive 140 can also be used. The positioning drive 140 comprises a drive motor 141, which serves 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. The respective length of the section of the tension member 30 actuated by the drive motor 141 can be detected, for example, by a speed sensor 146, an encoder, which is arranged between the drive roller 142 and the guide device 27.

[0154] It is advantageous if a section of the tension member 30 is tensioned between the drive roller 142 and the winding unit 145, for example by means of a tensioning device 149. The tensioning device 149 comprises a tensioning element 148, for example a tensioning roller, over which the tension member 30 runs. Thus, the section of the tension member 30 running between the drive roller 142 and the winding body 143 of the winding unit 145 is kept under tension. This, among other things, optimizes the winding onto the winding member, the winding body 143.

[0155] The winding body 143 can also be driven by a spring arrangement. In this case, a winding drive 144, for example an electric motor, is provided. The winding drive 144 can be controlled, and in particular regulated, based on the path of the tensioning element 30 between the tensioning element 147 and the winding body 143, for example to keep the tensioning element 30 under tension in this area.

[0156] A guide device is preferably provided to guide the tension 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.

[0157] A positioning drive 240 is designed so that its winding unit 245 simultaneously serves as the positioning drive and the drive for the pulling element 30. The pulling element 30 extends from a drive roller 242 past a speed sensor 246 to the guide body 248A of the pulling element guide unit 248. The speed sensor 246 measures the length of the pulling element 30 unwound or wound onto the winding unit 245 and thus the travel of the working device 50 when the pulling element 30 is actuated by the positioning drive 240.

[0158] The winding device 245 has a winding drive 244, which also serves as the tensioning element drive 241. The tensioning element drive 241, or winding drive 244, comprises, for example, an electric motor that can be controlled by the control unit 32 via a communication interface 247.

[0159] The guide assembly 248 comprises, for example, a slide or tension member guide body 248A, which is guided on a guide 248B. The guide 248B is, for example, a linear guide that runs parallel to a rotary axis D2 about which the winding body 243 rotates. The tension member guide body 248A thus makes an oscillating back-and-forth movement along the linear guide 248B, so that the tension member 30 is optimally wound and unwound onto the winding 243A.

[0160] It is possible that the control device 32 also controls the guide device 248 for the tensioning element 30. Furthermore, it is possible that the winding device 245 has local control for the guide device 248, or that this guide device 248 functions automatically, i.e., that it automatically follows the movement of the tensioning element 30 and ensures that a coil 243A wound on the winding body 243 of the tensioning element 30 is wound precisely.

[0161] It is also possible to position the work device 50 relative to the workpiece surface or room surface FL, FR, FF, FD to be machined by means of a positioning drive located on board the work device 50. For example, positioning drives 340A, 340B can be provided on the work device 50, which have drive motors, for example, work device drives 341A, 341B. The work device drives 341A, 341B drive, for example, wheels or drive rollers 342, which can roll along the surface FL, FR, FF, FD to be machined. The work device drives 341A, 341B are assigned to different directions of movement or axes of movement, for example, at right angles to each other. Thus, for example, the control unit 32 can also control the positioning drives 340A, 340B for positioning the work device 50 with respect to the surface to be machined FL, FR, FF, FD.

[0162] The work device 50 comprises a machine tool 51. The machine tool 51 can also be understood as a work device 50. The work 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 fixedly arranged with respect to a support 60 of the drive unit 52. A rotor 55 of the drive motor 53 rotates about a motor axis of rotation DM.

[0163] The drive motor 53 drives a tool holder 58 on which a working tool 90A, for example a disc tool 90, can be arranged or is arranged.

[0164] An output 56 of the rotor 55, on which, for example, a gear is arranged, drives an eccentric 57, in particular a drive 57B, for example, a gear, of the eccentric 57. The eccentric 57 has the tool holder 58 for the disc tool 90. The tool holder 58 is arranged on a rotary bearing 59 of the eccentric 57, so that the tool holder 58 can rotate about a tool axis DW. The tool axis DW and the motor axis MD have an eccentricity EX relative to each other. Thus, the disc tool 90 moves eccentrically about the motor axis DM and in a hypercycloidal motion about the tool axis DW. This ensures smooth running of the disc tool 90, which facilitates manual operation of the work device 50, as well as actuation by means of the positioning drives 40.

[0165] The carrier 60 has a cover wall 61 which covers the plate tool 90 at least on its upper side, preferably also on its outer circumference 93.

[0166] A motor mount 62, in which the drive motor 53 is mounted, projects from the top wall 61. On its side facing away from the plate tool 90, the drive motor 53 has a fan 63, which generates a cooling airflow that passes through the drive motor 53.

[0167] The cooling airflow KL can exit via a suction port 71 of an intake device 70 of the working device 50. The suction hose 11, for example, is connected to the suction port 71.

[0168] The disc tool 90 has a machining surface 91 for machining one of the surfaces FL, FR, FF, FD of space RA, whereby, of course, any other surface, for example, of a wooden or metal workpiece, can also be machined with the machining surface 91. Abrasives, polishing agents, or the like can be arranged directly on the machining surface 91. In this case, an adhesive layer 98 is provided to which an abrasive 99, for example, a sanding sheet, is detachably held. The adhesive layer includes, for example, hook and loop fasteners, hook and loop hooks, etc.

[0169] The processing surface 91 is in this case a flat surface, but can also have, for example, a depression or other contour.

[0170] The disc tool 90 has a machine side 92, wherein the machine side 92 and the machining surface 91 are facing away from each other or are arranged on opposite sides of the disc tool 90.

[0171] The machine side 92 is provided on a disc 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 disc tool carrier 100, which is essentially rigid and made, for example, of a correspondingly resilient plastic material. The machining surface 91 is located on the side of the layer 101 facing away from the disc tool carrier 100.

[0172] Intake air inlet openings 94 are provided on the machining surface 91, which are flow-connected to intake air outlet openings 95 on the machine side 92. For example, flow channels permeate the layer 100 and the disc tool holder 101. Intake air AL can flow into the intake air inlet openings 94. The intake air AL is represented in the drawing by hatched arrows.

[0173] The intake air AL serves to draw the disc tool 90 and thus also the working device 50 to the workpiece surface to be machined.

[0174] The intake air inlet openings 94 are arranged in a ring shape on the machining surface 91. For example, several, in particular at least two, in this case four, concentric ring arrangements 94 A, 94B, 94C, 94D of intake air inlet openings 94 are provided.

[0175] The intake air inlet openings 94 run in a ring shape around the central axis of the disc tool 90, which in this case corresponds to the tool rotation axis DW.

[0176] The intake air outlet openings 95 are also arranged in a ring around the tool's axis of rotation DW. It is possible that several ring arrangements of intake air outlet openings 95 are provided, particularly those concentric with each other. The drawing typically shows a single ring arrangement of intake air outlet openings 95.

[0177] The disc tool 90 is further equipped with additional air inlet openings 96 through which additional air ZL can flow into the disc tool 90. The additional air ZL is symbolically represented in the drawing by white arrows. The additional air inlet openings 96 are fluidically connected to additional air outlet openings 97 on the machine side 92 of the disc tool 90, for example by means of flow channels (not specified in detail) that pass through the adhesive layer 98, the elastic layer 101, and the disc tool carrier 100.

[0178] In principle, it is possible that the additional air ZL also provides for the suction of the disc tool 90 to the surface FL, FR, FF, FD to be machined. For example, additional air inlet openings 196 are provided for this purpose on a disc tool 190.

[0179] In contrast, in the case of the disc tool 90, the auxiliary air inlet openings 96 are arranged on its outer circumference 93. The auxiliary air inlet openings 96 are thus oriented radially outwards with respect to the central axis, in this case the tool rotation axis DW, of the disc tool 90. This allows the auxiliary air ZL from the surroundings of the disc tool 90 to carry particles, dust, or the like towards the disc tool 90 and flow out through the auxiliary air outlet openings 97.

[0180] The intake device 70 has an intake air inlet 72, which is associated with and flow-connected to the intake air outlet openings 95. Furthermore, the intake device 70 includes an auxiliary air inlet 73, which is flow-connected to the auxiliary air outlet openings 97.

[0181] The intake air inlet 72 is delimited by a seal 74, for example, an annular seal, which rests against the machine side 92 of the disc tool 90. The seal 74, like a seal 75, is designed as an annular seal, with the seal 75 located radially outside the seal 74. Thus, an annular chamber is defined between the seals 74 and 75, which defines the auxiliary air inlet 73. The radially outer seal 75 seals the auxiliary air inlet 73 against atmospheric pressure.

[0182] The intake air inlet 72 is, in effect, a central intake chamber located within 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.

[0183] The additional air inlet 73 communicates with the suction port 71 via a valve 85, the valve element 86 of which is adjustable between at least two, preferably several, valve positions.

[0184] The valve 85 forms part of an intake control unit 80 or can be controlled by it. The valve element 86 is adjustable within a valve housing 87 of the valve 85, for example, pivotable about a pivot axis SW1. A valve passage 88 on the valve housing 87 can be opened or closed by means of the valve element 86, with intermediate positions also being possible. On the input side, the valve 85 communicates with the auxiliary air inlet openings 96, namely with the auxiliary 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 element 86's position, more or less intake air is drawn in from the auxiliary air outlet openings 97 and transported away via the suction port 71.

[0185] The valve element 86 has a cylindrical circumferential wall 86A, which is movable past the inner circumference of a similarly cylindrical circumferential wall 87A of the valve housing 87. The circumferential walls 86A and 87A are in essentially sealing contact with each other. A seal 88A is arranged between an end face of the circumferential wall 86A and the cover wall 61 of the support 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 element 86 in a respective valve position.

[0186] The circumferential wall 86A projects in front of a top or bottom wall 86B of the valve element 86. The circumferential wall 87A of the valve housing 87 extends between the top wall 86B and the top wall 61 of the support. Thus, the valve element 87 is sandwiched between the top walls 61 and 86B.

[0187] A pivot bearing 86C is provided for supporting the valve element 86 relative to the valve housing 87. A bearing projection 86D, for example, extends from the cover wall 61 and engages in a bearing receptacle 86E of the valve element 86. A fastening element 86G, for example a screw, serves to secure the valve element 86 to the bearing projection 86D. The fastening element 86G preferably creates a preload on the valve element 86 in the direction of the seal 88A. The fastening element 86G extends, for example, parallel to the pivot axis SW1.

[0188] On the side facing away from the interior of the valve 85, the valve element 86 has an operating handle 86F which serves to be grasped by an operator.

[0189] The operating handle is simultaneously designed 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.

[0190] One or more of the markings 89A-89D may, for example, have detent projections 89E with which the valve element 86, in particular the actuating handle 86F, can be detented, for example with a detent lug or a detent projection 89F at its free end region. For example, the detent projections 89E may be provided in pairs at at least one of the markings 89A-89D, so that the actuating handle 86F can engage between the detent projections 89E.

[0191] Markings 89A and 89D correspond, for example, to a flow-through position and a closed position of valve 85. Markings 89B and 89C indicate a mixing ratio of intake air flowing through the auxiliary air inlet openings 96 and intake air flowing through the intake air inlet openings 94, which is optimally suited, for example, for side wall processing (marking 89B) or for ceiling processing (marking 89C). When processing a ceiling, for example, the ceiling surface FD, as little auxiliary air as possible is drawn in, so that the intake performance or suction force in the normal direction N, which can be generated by the intake air through the intake air inlet openings 94, is as high as possible.

[0192] A working device 50A and its disc tool 90 essentially correspond to the working device 50, except that a valve 185 is provided instead of the valve 85. The valve 185 forms, for example, a component of an intake control 180 or can be controlled by it. The valve 185 serves to control the vacuum in the area of ​​the auxiliary air outlet openings 97, but pivots about a pivot axis SW2 that is transverse to the flow direction of the intake air stream flowing through the suction port 71. Preferably, a valve element 186 of the valve 185 is arranged below the suction port 71. The valve element 186 has, for example, a partially cylindrical circumferential wall 186A that extends between end walls 186B, 186C. The end walls 186B, 186C are, so to speak, the bottom and top surfaces of the imaginary cylinder of the valve element 186.For example, bearing projections 186D are arranged on the end walls 186A, 186B, which engage in corresponding receptacles of the valve housing 187 and enable the pivot bearing of the valve element 186 about the pivot axis SW2.

[0193] An operating handle 186F, for example a lever or projection, is located in front of the end wall 186B, by which the operator can adjust the valve element 186 so that a valve opening 188 provided on the circumferential wall 186, i.e., an interruption of the circumferential wall 186 via a predetermined angular segment, can be brought into a flow position in which the outlet of the auxiliary air inlet 73, i.e., for example an opening between the seals 74, 75, is open. However, if the circumferential wall 186A closes this opening 189.

[0194] In a schematically depicted working device 50B, a valve 285 is provided instead of a valve 85 or 185. The valve 285 has a valve element 286, which can be manually actuated by means of an actuating handle 286f. The actuating handle 286f is arranged on the valve element 286 of the valve 285. The valve element 286 has a plate-shaped wall body 286A. The wall body 286 has a semi-annular shape, so that it can close or open a semi-annular opening in the cover wall 61, which defines a valve passage 288 of the valve 285.

[0195] The valve passage 288 extends within a valve housing 287 of the valve 285. The valve housing 287 has side walls 287A that project from the cover wall 61 and are closed by a cover wall 287B. The suction port 71 is located on the cover wall 287B. Furthermore, the valve housing 287 communicates with the intake air outlet openings 95, which are located in the interior of a circumferential wall 287C of the valve housing 287. The drive motor 53, for example, is located in the interior bounded by the circumferential wall 287C, which defines the intake air inlet 72 (shown schematically).

[0196] The actuating handle 286F can, for example, engage in a guide recess 289, which is, for instance, a kind of extension of the valve passage 288, with a clamping or detent section (not visible in the drawing) in order to lock, clamp, or the like the valve member 286 relative to the valve housing 287, in this case the cover wall 61, in one or more valve positions. The clamping or detent section can, for example, engage in the guide recess 289 and be in a rear grip with it.

[0197] The guide recess 289 and the valve passage 288 extend in an annular shape around a pivot axis SW3, about which the valve member 286 can pivot. The valve member 286 is thereby adjusted about the pivot axis SW3 in a sliding motion along the valve passage 288. The pivot axis SW3 and the motor rotation axis DM are preferably coaxial.

[0198] A valve 385 of a working device 50C is essentially equivalent to valve 285. Similar components are therefore provided with reference numerals that are 100 higher than those of valve 286. Where identical components exist, they are provided with the same reference numerals.

[0199] A valve element 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 actuating handle 386F for manually actuating the valve element 386 is not guided on the valve passage 388, but on a separate guide 385G. The guide 386G, like the valve passages 288 and 388, extends in a ring shape around the pivot axis SW3. Any clamping devices, detent devices, or the like for clamping or locking the actuating handle 386B, and thus the valve element 386, in predetermined valve positions can be implemented using the separate guide 386G.

[0200] Preferably, the valve 385 comprises a valve actuator 82, for example, a drive motor 382, ​​which is in drive engagement with, for example, the cover wall 61 or another component fixed relative to the support 60. For example, the drive motor 382 can have a pinion on its output shaft that engages with a toothed section fixed on the support 60. For manual actuation of the valve 385, for example, the pinion can be disengaged from the toothed section or the drive motor 382 can be run with minimal resistance. Thus, decoupling of a valve actuator for manual actuation of a valve is possible within the scope of the invention.

[0201] A working device 50D is constructed similarly to working devices 50B and 50C, but has a valve 485 instead of valves 285 and 385. Valve 485 has a valve housing 487, which is constructed similarly to valve housing 287 and therefore has the same reference numerals in the drawing. A valve passage 488 of valve 485 communicates with the auxiliary air inlet 73 and can be closed by a valve element 486.

[0202] The valve element 486 has a wall-like or plate-like shape, for example a plate body 486A, which is pivotable about a pivot axis SW4 between a flow 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.

[0203] The vacuum applied at the suction port 71 forces the valve element 486 towards its open position DS and can be actuated into its closed position SS by an actuating device with an actuating element 486B.

[0204] Instead of or in addition to the actuating element 468B, a spring 468K can readily be provided, which acts on the valve element 486 in its closed position SS. In this case, the valve 485 operates in a pressure-controlled manner, i.e., when the vacuum at the suction port 71 is greater than the spring force of the spring 468K, the valve 485 opens, so that the vacuum in the intake area or at the machining surface 91 of the disc tool 90 drops, because, so to speak, external air can flow in through the additional air inlet openings 96.

[0205] The actuating element 486B is pivotally mounted on the valve housing 487, for example on one of the side walls 487. The actuating element 486B comprises, for example, a pivot lever whose free end can act on the valve member 486 to move it into the closed position SS. The actuating element 486 thus has, for example, a lever-like shape or a lever.

[0206] The actuating element 486B is connected to an actuating handle 486F, for example a pivot lever, which is arranged on an outside of the valve housing 487, for example also on one of the side walls 487A or 487B. The actuating handle 486B includes, for example, an actuating lever that can be grasped by the operator. The actuating handle 486F can be locked in various detent positions by means of a detent device 486H, which correspond to the valve positions of the valve 485, for example the DS or SS positions, for example in the open position and / or the closed position and preferably one or more intermediate valve positions. The detent device 486H has, for example, detent projections 4861 with which the actuating lever 486G can be locked. The detent projections 4861 project in front of one of the side walls 487A.

[0207] A valve 585 of the working device 50E, which operates automatically and is position-dependent, has a valve element 586 in the form of a rolling element, in particular a ball or the like. The valve element 586 is freely movably mounted in a valve housing 587 of the valve 585. The valve housing 587 has, for example, a circumferential wall or side walls 587A that narrow towards an outlet 587B of the valve housing 587 or are oriented towards each other. Thus, the valve housing 587 is narrower in the area of ​​the outlet 587B than in the area of ​​one or more valve passages 588, which are provided on a wall 588A that effectively closes the auxiliary air inlet 73. Therefore, air flowing through the additional air inlet 73 can flow through one or more of the valve passages 588 to the outlet 587B, which in turn is connected to the suction port 71.

[0208] When the working device 50 assumes an overhead position, for example when processing the ceiling surface FD, the valve element 386 moves away from the valve opening 588 into a position that closes the outlet 587B, which is indicated in the drawing by a continuous line across the valve element 586. Thus, air flowing through the auxiliary air inlet openings 96, which is essentially false air, can no longer reach the suction port 71, thereby increasing the suction force in the area of ​​the intake air inlet openings 94. However, if the working device 50 assumes, for example, a vertical orientation, i.e., if the machining surface 91 runs vertically, the valve element 586 can move away from the outlet 587B, for example by sliding or rolling along an incline of the side walls 587A, so that the outlet 587B becomes free and thus supply air or false air can flow in through the additional air inlet openings 96.

[0209] The drawing also indicates that the valve element 586 can also move into a position that closes the at least one valve passage 588 (shown in dashed lines).

[0210] In the embodiment of the disc tool 190, it is also indicated that an additional air inlet opening 196 can also be arranged on the machining surface 91, so that the valve 585 can be used, for example, directly to influence the airflow flowing over the machining surface 91 or the negative pressure prevailing there.

[0211] In addition to the quasi-automatic concepts of vacuum control via manually operated valves or position-dependent valves (585), servomotor-driven or controlled concepts are also readily possible: For example, the intake control 80 includes a control unit 81. The control unit 81 can, for example, control the motorized valve actuator 82, in particular a servomotor. The valve actuator 82 can, for example, directly drive one of the valve elements 86, 186, 286, 386, or 486.

[0212] The valve actuator 82 can also include, for example, a magnetic actuator 582, such as an electric coil, to actuate the valve element 586 into one or more valve positions.

[0213] The intake control 80 can actuate the valve actuator 82 based on sensor signals from one or more sensors of a sensor arrangement 83, for example, based on a position sensor 83A, whose output signal indicates the angular position of the working device 50 relative to a substrate, for example, the surface FD. A motor sensor 83B, in turn, is, for example, a current sensor or comprises a current sensor, whose output signal or sensor signal indicates, for example, the power of the drive motor 53. Depending on the suction of the working device 50 against the surface to be machined, the friction of the machining surface 91 against the surface to be machined changes, whereby the drive power of the drive motor 53 and thus its motor current also changes, which can be detected by the motor sensor 83B.Then the control device 81 can, for example, control the motor valve drive 82 in the sense of reducing the vacuum in the intake area when engine power increases and in the sense of increasing the vacuum when engine power decreases.

[0214] However, direct pressure 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 located in the vacuum or suction area and directly measures the vacuum with which the disc tool 90 and thus the working device 50 is drawn against the surface to be machined.

[0215] For example, a force sensor 83F, 83G, such as a strain gauge or similar device, can be used to measure the contact force with which the workpiece body 65B and / or the disc tool 90 presses against the surface to be machined. The force sensor 83G can be located, for example, on the drive train, such as at a bearing, of the working device 50. If the contact force of the workpiece body 65B becomes too high, the intake control 80, in particular the control unit 81, can actuate the valve actuator 82 to reduce the vacuum, or, if the contact force is too low, to increase it.

[0216] The work devices 50, 50A, 50B, 50C, 50D, 50E, 50F can be designed for manual operation, i.e., operation guided by an operator. However, it is also possible that they can be used in conjunction with the positioning device 13 for a type of robotic operation.

[0217] For example, the working device 50 is described below in an installation position in a housing 64, which can be actuated by the positioning device 13. The supports 60 of the other working devices 50A, 50B, 50C, 50D, 50E, 50F can also be actuated by the tension elements 30 and are preferably also received in the housing 64.

[0218] It can be seen that the working device 50 can be used autonomously or manually. However, the pulling elements 30, for example, can also be directly attached to it. In this case, however, the working device 50 is designed such that the carrier 60, including all components attached to it, namely the drive unit 52 and the disc tool 90 / working tool 90A, are housed in a casing 64. The casing 64 forms an intake casing 64A, the interior 64E of which forms a vacuum chamber. The casing 64 has a circumferential wall 64B, which is covered by a top wall 64C. The top wall 64C has a dome or hood 64D in which a flow channel or flow chamber for the cooling air KL, which flows out of the drive motor 53 or its fan 63, is formed. The cooling air KL can be extracted via a suction port 64F, to which, for example, the suction hose 1 can be directly connected.The suction port 64F communicates fluidically with the suction port 71 of the drive unit 52, which is located inside the interior 64E, so that air flowing out of the suction port 71, which is an exhaust port, can be extracted via the suction port 64F.

[0219] The housing 64 is provided with pull-element holders 67 to which the pull-elements 30A-30D can be detachably secured, for example, by means of a latching mechanism, a magnetic holder, or the like. Thus, the pull-elements 30 can be easily detached from or attached to the holders 67 by an operator, but then have a secure hold, so that the tensile forces of the positioning device 13 or the positioning drives 40 can be transmitted to the working device 50.

[0220] The brackets 67 are provided on the housing 64 at equal angular intervals, for example at 90° each, so that the tensile forces of the tensioning elements 30 can be optimally transferred to the housing 64.

[0221] The housing 64 further carries a guide device 65, which serves to guide the tool along the respective surface FL, FR, FF, or FD to be machined. The guide device 65 comprises a guide carrier 65A, which is attached 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 several contact bodies arranged in a ring shape, extending around the working tool 90A. The guide carriers 65A have guide contours 65C, for example, guide surfaces, which preferably lie in the same plane as the machining surface 91 when the machine tool 51 rests against one of the surfaces FL-FD, as schematically illustrated in the drawing. The contact body 65B preferably comprises a seal, in particular a sealing ring, which defines an intake area 65G of the housing 64.Within the intake area 65G, the disc tool 90 or working tool 90A is arranged.

[0222] It can be seen that not only the disc tool 90, but also the entire housing 64 is drawn against the surface of the workpiece or the space to be machined. However, the guidance of the working device 50 is primarily achieved via the support body 65B with respect to the surface to be machined.

[0223] The support body 65B is movably mounted relative to the guide carrier 65A and spring-loaded by springs 65D in the direction of a contact position where the guide contours 65C bear against the surface to be machined. The springs 65D, like the support body 65B, are received in a spring chamber 65E, where they are linearly movable in the normal direction relative to the machining surface 91 or in the normal direction relative to the guide contour or guide surface 65C, and preferably also pivotally movable transversely to this direction. The support body 65B is preferably not only linearly displaceable on the guide carrier 65A parallel to the motor axis of rotation DM or tool axis of rotation DW, but also transversely to it about at least one pivot axis. Thus, the support body 65B is floatingly mounted in the spring chamber or bearing receptacle 65E.

[0224] Preferably, the disc tool 90 is flexible with respect to the surface to be machined, for example due to the elastic layer 101. Optimal adaptation to the contour of the surface to be machined is further improved by the fact that the drive unit 52 is movably mounted with respect to the guide device 65 by means of a bearing device 66.

[0225] The bearing arrangement 66 comprises, for example, a diaphragm 66A, which is fixedly positioned relative to the housing 64, namely, for example, sandwiched between retaining sections 66B, 66C, which are provided on one side by the housing 64, namely its circumferential wall 64B, and on the other side by a valve carrier 64H. The valve carrier 64H extends annularly around the working tool 90A and is, so to speak, sandwiched between the guide device 65, in particular the guide carrier 65A, and the circumferential wall 64B.

[0226] The diaphragm 66A thus enables a floating, multi-axis pivoting movement of the drive unit 52 relative to the housing 64 or the guide device 65, so that the working tool 90A can easily follow a surface contour of the surface to be machined. In addition, the working tool 90A is linearly adjustable relative to the guide device 65, namely parallel to the tool rotation axis DW.

[0227] Instead of the diaphragm 66A, for example pivot bearings, in particular cardan pivot bearings, and / or sliding bearings may also be provided.

[0228] Preferably, the drive unit 52, and thus the working tool 90A, is spring-loaded in a contact position where it is in contact with the workpiece surface to be machined, for which, for example, a spring arrangement 69 is provided. The spring arrangement 69 comprises an arrangement of one or more springs 69A, which are supported on one side by the housing 64 or the support 60, and on the other side by the diaphragm 66A, namely by means of spring holders 69B, 69C. The spring holders 69C are arranged on the diaphragm 66A, and the spring holders 69B are fixed relative to the guide device 65, namely fixed relative to the housing 64. Since the housing 64 is fixed relative to the guide device 65, the spring holders 69B support the springs 69A and the bearing device 66, and thus the drive unit 52 held thereon, relative to the guide device 65.

[0229] The bearing arrangement 66 further enables the working tool 90A to be moved from the working position shown in the drawing, in which the working tool 90A is in contact with the surface to be machined, to a rest position away from it. 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 tension elements, pull cables, rod-like elements or the like. The transmission elements 68B are connected to the drive elements 68A and the drive unit 52, namely to the diaphragm 66A, which in turn is connected to the drive unit 52. Thus, the transmission elements 68B pull the diaphragm 66A away from the guide contour 65C in order to move the working tool 90A to its rest position.The rest position is advantageous, for example, when the working tool 90A is not needed, particularly during pre-positioning before the actual surface treatment. This prevents the disc tool 90 from causing any damage, as it remains inactive or in the rest position until the actual surface treatment begins.

[0230] Preferably, the actuator(s) 68 engage at least two opposing points or several points on the diaphragm 66A or the drive unit 52 that have the same angular distances to each other.

[0231] It is possible to set a basic suction force, with which the disc tool 90 draws itself against the surface to be machined, using the valves 85-585. However, it is also possible to fully open the valves 85-585. In both scenarios, the suction force control or vacuum influence described below can be advantageously applied: Additional air flowing through the additional air inlet openings 96 can be influenced not only on the machine side 92 of the disc tool 90, but also, so to speak, from the outside.

[0232] Valves 685 are arranged on the housing 64, in particular on 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 carrier 64B. The wall 687 extends in an annular shape next to the circumferential wall 64B of the intake housing 64A and forms a kind of step. Preferably, several spaced-apart, in particular angularly spaced, valve passages 688 are provided on the wall 687. The valve passages 688 have, for example, an annular shape and thus follow the outer circumferential contour of the circumferential wall 64B. The valve passages 688 are fluidically connected to an annular space 689 that extends around the working tool 90A.The annular space 689 remains open to the auxiliary air inlet openings 96 on the radial outer circumference of the working tool 90A, so that air flowing in through the valve passages 688 can reach the auxiliary air inlet openings 96 and thus reduce the suction force in the area of ​​the intake air inlet openings 94. False air is then drawn in via the suction port 71 or 64F, namely through the valve passages 688 and the auxiliary air inlet openings 96.

[0233] The valves 685 have valve elements 686. The valve elements 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 sealing the respective valve passage 688.

[0234] The valve element 686 is movably mounted on bearing projections 686C, 686D, which project from the wall 687. For example, the bearing projections 686C, 686D are bolts, screws or the like, along which the valve element 686 can slide and / or pivot.

[0235] In a closed position SS, the valve element 686 closes the valve passage 688, while in a flow position DS of the valve element 686 it is open.

[0236] For example, a linear adjustment of the valve element 686 with respect to the longitudinal axes of the bearing projections 686C, 686D is possible. However, in this case, a pivoting movement of the valve element 686 on one of the bearing projections 686C, 686D is desired. This pivoting movement is triggered or enabled, for example, by the fact that springs 686F, 686G, which are arranged on the bearing projections 686C, 686D and supported on support projections 686H of the same and on the valve element 686, are pre-tensioned to different degrees. For example, spring 686F has a smaller spring force than spring 686G because it is pre-tensioned to a lesser degree.

[0237] Springs 686F and 686G compress valve 686 into the closed position SS. A vacuum in the intake area 64G allows valve 686 to be adjusted to its open position DS. Specifically, when atmospheric pressure exceeds the vacuum in the intake area 64G by a predetermined amount, it acts on valve 686, opening valve 685. Thus, a form of automatic vacuum control is achieved through a spring arrangement.

[0238] In addition, the operator can also allow external air or supplemental air to flow into the intake area 64B via valves 685M. The valves 685M comprise valve passages 688B, which are arranged on the radial outer circumference of the valve carrier 64H. The valve passages 688B are fluidically connected to the intake area 64G and can be closed by at least one valve element 686M. The valve element 686M is, for example, an annular body, particularly with a plate shape, which is pivotable about an axis of rotation parallel to the engine axis of rotation MD. Several actuating handles 686H, for example, actuating projections, are arranged on the valve element 686M, so that the operator can adjust the valve element 686M between a flow position that releases the valve passages 688B and a closed position that closes them, and preferably one or more intermediate valve positions, by actuating one of the actuating handles 686H.

[0239] The work devices 50, 50A, 50B, 50C, 50D, 50E, 50F can be adjusted with respect to the surfaces to be machined using the positioning device 13. However, operation with a single hand movement is also possible, as will be explained in more detail below.

[0240] A rod-shaped handle 800 is preferably pivotably mounted to the working device 50, 50A, 50B, 50C, 50D, 50E, 50F in a multi-axis manner. For example, a pivot joint 801 is provided which pivots the handle 800 about a pivot axis SQ that 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 achieved by a pivot joint 801, which is only schematically indicated in the drawing. The pivot joints 801, 802 together form a gimbal pivot joint.

[0241] A fixed rod section 803 of the handle 800 extends from the pivot joint 801 along the longitudinal axis LL. A current supply device 804 for supplying current to, for example, the drive motor 53 is provided at the longitudinal end region of the rod section 803 furthest from the working device 50. It should also be mentioned here that the drive motor 53 is preferably an electronically or electrically commutated drive motor.

[0242] The current supply device 804 is arranged between the rod section 803 and a telescopic section 805 of the handle 800. The telescopic section 805 comprises a base tube body 806, which is rigidly connected to the current supply device 803. An adjustable tube body 807 is slidably mounted on the base tube body 806 with respect to the longitudinal axis LL. For example, the adjustable tube body 807 engages in an interior space of the base tube body 806.

[0243] At the free end of the adjustable tube body is a support body 808, which preferably extends transversely to the longitudinal axis LL. The support body 808 is suitable, for example, as a support for bracing against the operator's body, such as a shoulder support or the like. This makes the handle 800 extremely ergonomic to use.

[0244] The adjustable tube body 807 is adjustable relative to the base tube body 806 along an adjustment path which is limited by longitudinal stops 809, 810 which are arranged on the base tube body 806 and adjustable tube body 807 respectively.

[0245] In a given longitudinal position of the adjustable tube body 807 relative to the base tube body 806, it can be fixed by means of a fixing device 811. The fixing device 811 comprises, for example, a bracket that is attached to the base tube body 806 in the manner of a sleeve or clamp, for example, by means of radially projecting retaining projections 815 that are, for example, screwed, clamped, or the like together. The bracket 812 has a clamping clamp 813 which, by means of an actuating handle 814, for example, a clamping screw, a clamping lever, or the like, can be adjusted between a position that clamps or fixes the adjustable tube body 807 relative to the base tube body 806 and a release position that releases it relative to the base tube body 806 and is thus adjustable.

[0246] The work device 50F is to be understood as an example that a coating device or a work device suitable for machining a workpiece surface, for example a surface, can also be operated and positioned using the positioning device 13.

[0247] The work device 50F comprises a coating unit 980 with coating heads 981A, 981B as coating tools 981. The coating heads 981A, 981B are designed for coating a surface to be processed or coated; that is, they can, for example, apply a coating fluid, in particular a color liquid, color particles, to the surface. The coating fluid is contained in reservoirs 983A, 983B of the work device 50F and / or is supplied to the work device 50F via flexible lines from a stationary device, for example, a reservoir on the vacuum cleaner 15B.For example, the reservoirs 983A, 983B may contain paint or other coating fluid, which can flow via lines 982A, 982B to the coating heads 981A, 981B in order to coat the surface to be processed, for example to color it and / or to provide it with a protective layer or the like.

[0248] Furthermore, the coating device 980 can also include, for example, a quenching device 985, in particular a quenching head, with which at least parts of the coating applied by means of the coating heads 981A, 981B can be quenched again.

[0249] The erasing device 985 or the erasing head, as well as the coating tools 981 or coating heads 981A, 981B, are connected or connectable to the control unit 32 via communication lines 984. Instead of a communication line 984, a wireless connection, such as a radio connection, to and from the control unit 32 can, of course, also be provided. Via the communication lines 984, the control unit 932 can, for example, control the application of paint or other coatings by the coating tools 981 or coating heads 981A, 981B, or it can also effect or control erasing by the erasing device 985, which may include, for example, an erasing device, a grinding head, or the like.

[0250] The coating device 980 is arranged on a support body 990, which is in particular plate-like. The support body 990 has, for example, a base body 998 on which a machining surface 991, for example a support surface for bearing against the surface to be machined, is provided. The machining surface 991 is provided, for example, on a sliding body or a sliding layer 999, which is arranged on the end face of the base body 998.

[0251] The coating heads 981A, 981B and the erasing head 985 are arranged, for example, in cavities of the base body 998 that are set back behind the processing surface 991.

[0252] The base body 998 can be fitted with, for example, the previously described auxiliary air inlet openings 96, the intake air inlet openings 94, and the like, which communicate, for example, with the previously described auxiliary air inlet 73 and the intake inlet 72. Intake control is possible, for example, by means of the valve 585, so that the machining surfaces 991, like the previously described machining surfaces 91, can be optimally drawn to the surface to be machined.

[0253] All the aforementioned embodiments in connection with the working devices 50-50E are therefore also possible with the working device 50F with regard to the intake control or vacuum control on the machining surface 991, which in this respect is or forms a support surface.

[0254] Furthermore, the work device 50F can comprise or form a machine tool 951. This can be provided as an alternative or supplement to the coating device 980.

[0255] The machine tool 951 comprises a drive motor 953, which drives a tool holder 958 via a tool shaft 956. A working tool 90F, for example a milling head, is arranged or can be arranged on the tool holder 958.

[0256] The machining surface 991 forms, for example, a guide contour 965C of a guide device 965.

[0257] The milling head or other working tool 90F can permanently project in front of the machining surface 991 or guide contour 965C, or advantageously, it can be adjusted by means of an actuator 994 between a position projecting further in front of the machining surface 991 or guide contour 965C (shown with a dashed line) and a working position or depth setting position projecting less in front of the machining surface 991 or guide contour 965C, in particular even retracted behind the machining surface 991. Thus, the working tool 90F can penetrate more or less deeply into the workpiece to be machined. In particular, during positioning by the positioning device 13, when the working tool 90F is not machining the surface to be machined or is inactive, it is possible that the working tool 90F is retracted behind the guide contour 965C so that it is not in contact with the workpiece.

[0258] The actuator 954 and the drive motor 953 are connected or connectable to the control unit 32 via communication links 955, for example communication lines or wireless connections, which controls the drive motor 953 and the actuator 954 according to the workpiece surface to be machined.

[0259] Similarly, it is also possible, in principle, for example, that the coating tool 981 and / or the extinguishing device 985 can be adjusted to a position projecting further in front of the guide contour 965C or to a position further back towards it, in particular behind it, by, for example, arranging actuators 986 on the coating tools 981 and / or the extinguishing device 985. The actuators 986 can be controlled wirelessly or via wired connections by the control unit 32, as not shown.

[0260] Further examples of implementation are related to Figure 12 indicated. On the housing 64, for example, cutting tools and / or a coating device can also be held, so to speak, floating and / or movable relative to the guide device 65, in particular to the guide contour 65C, e.g. by means of the bearing device 66.

[0261] For example, instead of the disc-shaped tool 90, a milling head or other cutting tool can also be driven by the drive motor 53. For example, a tool holder 58F can be provided directly on the drive motor 53 instead of the connection to the eccentric 57, to which the tool 90F, for example a milling head, drill, or the like, can be directly attached. The actuator 954, already described and schematically shown in the drawing, can be provided for adjusting the tool 90F relative to the carrier 60.

[0262] Alternatively or additionally, 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 981B, can be fixedly arranged on the carrier 60 or be movably adjustable by means of an actuator 986 between a position projecting further in front of the guide contour 65C or a position further back relative to the guide contour 65C, in particular behind the guide contour 65C.

Claims

1. A mobile machine tool (51) for coating and / or abrasive machining of a surface (FL, FR, FF, FD) of a workpiece or a room (RA) using a working device (50) which is mobile with respect to the surface (FL, FR, FF, FD) and which comprises a tool receptacle (58) for a work tool (90A, 90 F) driven or drivable by a drive motor (53) for machining the surface and / or a coating device (980) with a coating tool (981) for coating the surface (FL, FR, FF, FD), wherein the working device (50) comprises a guide device (65) having at least one guide contour (65C), particularly a guide surface, for guiding along the surface (FL, FR, FF, FD), wherein the work tool (90A, 90F) or the coating tool (981) is movably mounted relative to the guide device (65) and wherein the working device (50) or the work tool (90A, 90F) or the coating device (980) is supported on the guide device (65) in a pivotable, particularly multi-axially pivotable, and / or floating manner by means of a bearing device, characterized in that the guide device (65) comprises a guide carrier (65A) to which a contact body (65B), particularly a sealing body, comprising the guide contour (65C) is movably mounted for contacting the surface (FL, FR, FF, FD) to be processed, wherein the guide member (65A) is rigid or stiff, and the working tool (90A, 90F) or the coating device (980) or the working device (50) as a whole is movably mounted on the guide carrier (65A).

2. The machine tool according to claim 1, characterized in that the working device (50) comprises a suction device (70) for suctioning the working device (50) onto the surface (FL, FR, FF, FD) with at least one force component oriented in a normal direction (N) of the surface (FL, FR, FF, FD).

3. The machine tool according to claim 1 or claim 2, characterized in that the working device (50) comprises a plate tool (90) arranged or arrangeable on the tool receptacle (58), which tool comprises a processing surface (91) assigned to processing a workpiece and a machine side (92) opposite to the processing surface (91).

4. The machine tool according to any one of the preceding claims, characterized in that the working device (50) or the work tool (90A, 90F) or the coating device (980) is linearly supported at the guide device (65) with respect to the at least one guide contour (65C) by means of the bearing device.

5. The machine tool according to claim 4, characterized in that the bearing device supports the working device (50) or the work tool (90A, 90F) or the coating device (980) for pivoting about at least one pivot axis transversely to an axis of rotation of the work tool (90A, 90F) or to the force component oriented in the normal direction (N) of the surface (FL, FR, FF, FD) and / or in that the bearing device comprises at least one membrane (66A) on which the work tool (90A, 90F) or the coating device (980) or the working device (50) is held on the guide device (65).

6. The machine tool according to any one of the preceding claims, characterized in that the work tool (90A, 90F) or a coating tool (981) of the coating device (980) can be adjusted with respect to the guide device (65) relative to the guide contour (65C) between a working position intended for contacting the surface (FL, FR, FF, FD) and a resting position set back with respect to the at least one guide contour (65C), in which position the guide contour (65C) is in contact with the surface (FL, FR, FF, FD) and the work tool (90A, 90F) or coating tool (981) is at a distance from the surface.

7. The machine tool according to any one of the preceding claims, characterized in that the working device (50) has a motor driven or manual actuator for moving the work tool (90A, 90F) or coating tool (981) between the resting position and the working position and / or in that the work tool (90A, 90F) or coating tool (981) is tensioned by a spring arrangement into a working position relative to the guide device (65) intended for contacting the surface (FL, FR, FF, FD).

8. The machine tool according to any one of the preceding claims, characterized in that the contact body (65B) is spring-loaded by a spring arrangement with respect to the guide carrier in the direction of the surface (FL, FR, FF, FD) to be processed.

9. The machine tool according to any one of the preceding claims, characterized in that the guide device (65) has at least one suction region for suctioning onto the surface (FL, FR, FF, FD).

10. The machine tool according to any one of the preceding claims, characterized in that the working device (50) is received in a suction housing (64A), wherein it is advantageously provided that the suction housing (64A) forms a component of the guide device (65).

11. The machine tool according to any one of the preceding claims, characterized in that the guide device is provided for guiding the machine tool along the surface (FL, FR, FF, FD) to be processed, wherein the guide contour (65C) is in contact with the surface (FL, FR, FF, FD) and the work tool (90A, 90F) passes through relative movements with respect to the guide contour contacting the surface.

12. The machine tool according to any one of the preceding claims, characterized in that at least one handle (800) and / or at least one traction member holder (67) is arranged on the guide device (65) for transmitting guiding forces to the guide device (65), such that the guide device (65) can be guided along the surface (FL, FR, FF, FD), wherein the work tool (90A, 90F) makes relative movements away from the guide contour contacting the surface and towards the same when the guide contour (65C) is in contact with the surface (FL, FR, FF, FD).

13. The machine tool according to any one of the preceding claims, characterized in that it forms a mobile working device (50) of a surface processing system (10) for coating and / or abrasive processing and / or machining of a surface of a workpiece or a room.

14. The machine tool according to claim 13, characterized in that the surface processing system (10) comprises at least one holding device (20) which can be fastened in place with respect to the surface (FL, FR, FF, FD) and which is connected to the working device (50) by means of at least one flexurally flexible traction member (30), and / or in that the surface treatment system (10) comprises a positioning device (13) having at least one positioning drive (40, 340) for positioning the working device (50) transversely to the normal direction (N) of the surface (FL, FR, FF, FD) and / or in that the surface treatment system (10) comprises the at least one holding device (20) and the or a positioning drive (40, 340) for the at least one traction member (30) and / or in in that the at least one positioning drive (40, 340) comprises or is formed by at least one traction member drive (41) for driving the traction member and / or at least one working device drive arranged on board the working device (50) and / or in that the surface processing system (10) comprises at least two or at least three or at least four traction members (30) and / or at least two or at least three or at least four holding devices (20), wherein the working device (50) is held on the traction members (30) or holding devices (20), and / or in that the working device (50) comprises traction member holders for holding at least one traction member (30), which holders are particularly arranged at equal or about equal angular distances, and / or in that the surface treatment system (10) comprises at least one motor-driven and / or spring-loaded winding device (45) for winding up the traction member (30).

15. A surface processing system (10) having a machine tool (51) according to any one of the preceding claims.

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