Power tool assembly and illumination system for a power tool assembly

Abstract

The invention relates to a power tool assembly (10) which comprises a hand-held power tool (12) and an illumination system (32). The hand-held power tool (12) has an electrical drive unit having a brushless DC motor and a motor control unit which is coupled to the brushless DC motor for signalling purposes. The illumination system (32) comprises: an illumination unit having at least one light source; a control unit which is connected to the illumination unit for signalling purposes, wherein the control unit is designed to operate the illumination unit in a pulsed-light mode; and a signal interface which is connected to the control unit for signalling purposes, wherein the signal interface is designed to receive a signal describing a motion state of the tool (22), so that, in the pulsed-light mode, an illumination state can be adapted to the motion state by means of the control unit (62). The invention also relates to an illumination system (32).

Description

[0001] Machine tool assembly and lighting system for a machine tool assembly

[0002] The invention relates to a machine tool assembly and a lighting system for a machine tool assembly.

[0003] The machine tool assembly includes a hand-held machine tool and a lighting system.

[0004] When a hand-held power tool is used to machine a workpiece, it is important, among other things, that the user of the hand-held power tool can clearly see the section of the workpiece to be machined as well as the engaging section of the tool that interacts with the workpiece. This is the only way to achieve a precise and high-quality work result. In this context, lighting systems have become known that can illuminate the engaging section of the workpiece to be machined and / or the engaging section of the tool that interacts with the workpiece. This makes the engaging section of the workpiece to be machined and / or the section of the tool that interacts with the workpiece more visible.

[0005] The object of the present invention is to further improve such lighting systems and hand-held machine tools equipped therewith, ie machine tool assemblies.

[0006] The object is achieved by a machine tool assembly comprising a handheld power tool and a lighting system. The handheld power tool has an electric drive unit with a brushless DC motor and with an AS: TOP motor control unit signal-coupled to the brushless DC motor. The lighting system comprises a lighting unit with at least one light source, wherein the lighting unit is aligned or alignable such that, when the lighting system is in use, an engagement section of a tool of the handheld power tool can be illuminated by means of the light source. Furthermore, the lighting system comprises a control unit signal-connected to the lighting unit, wherein the control unit is designed to operate the lighting unit in pulsed light mode.Furthermore, the lighting system comprises a signal interface that is signal-connected to the control unit. The signal interface is designed to receive a signal describing a movement state of the tool, so that in pulsed light mode, the control unit can adjust the lighting state to the movement state. The lighting system thus makes an engagement section of the tool of the hand-held power tool clearly visible. This ensures a precise and high-quality work result.

[0007] The brushless DC motor is, in particular, sensorless. This means that the DC motor, in particular, does not have a sensor designed to detect the relative position of a rotor of the DC motor with respect to a stator of the DC motor. Furthermore, this means, in particular, that the DC motor does not have a sensor designed to detect the rotational speed of the rotor relative to the stator. Such brushless and sensorless DC motors are therefore very simply constructed. Therefore, they are robust and reliable in operation.

[0008] The brushless DC motor used as the drive motor for hand-held power tools is often referred to as a brushless DC motor or, for short, a BLDC motor. BL motor or electrically commutated (EC) motor are also common terms. Brushless DC motors have the advantage of not requiring brushes, allowing them to operate with little wear and reliably. The necessary commutation, as the term EC motor suggests, is performed electronically by the motor control unit. Although the brushless DC motor is designed to be connected to a DC power source, it does not strictly function like a conventional DC motor. Instead, it converts the supplied DC current into a suitable three-phase current using the motor control unit, e.g.using pulse-width modulation, so that the brushless DC motor operates strictly as a three-phase motor. The motor control unit includes an inverter for this purpose.

[0009] According to one embodiment, the signal interface for receiving the signal describing the movement state of the tool is signal-coupled to the motor control unit. In this way, the signal describing the movement state of the tool can be reliably received at the signal interface. The signal describes a working frequency of the tool and / or a tool position. The operation of the lighting system can thus be reliably coordinated with the movement state of the tool.

[0010] The signal describing the movement state of the tool can be based on a control signal for the brushless DC motor provided by the motor control unit. Alternatively or additionally, the signal describing the movement state of the tool can be based on a feedback signal transferred from the brushless DC motor, in particular from a stator of the brushless DC motor, to the motor control unit. The signal describing the movement state of the tool can therefore be derived from a control signal for the brushless DC motor provided by the motor control unit. Alternatively or additionally, the signal describing the movement state of the tool can be derived from a feedback signal transferred from the brushless DC motor to the motor control unit.In this way, the signal describing the movement state of the tool can be determined easily and reliably. According to one variant, the control signal can describe a motor current curve and / or a motor voltage curve. Alternatively or additionally, the feedback signal can describe an induction voltage curve and / or an induction current curve. The motor voltage curve is described, for example, using a phase angle. The motor current curve and / or the motor voltage curve are present in the motor control unit, as they are required to control the brushless DC motor. Accordingly, no further sensors are required to generate the signal describing the movement state of the tool. In particular, no Hall sensors are necessary. The feedback signal is also a signal that is generated by essential, i.e.The components of the DC motor required to provide drive power are also provided and thus also present in the motor control unit. Therefore, no dedicated sensor is required to provide the feedback signal. In other words, the signal describing the tool's motion state can be generated sensorlessly. This is structurally particularly simple and efficient. Furthermore, it is advantageous in terms of installation space. The machine tool assembly can therefore be built compactly.

[0011] According to one embodiment, the brushless DC motor is controlled by the motor control unit using so-called block commutation. As already mentioned, the brushless DC motor is strictly speaking operated as a three-phase machine. The brushless DC motor, or more precisely the stator of the DC motor, can be controlled by a number of stator coils, each formed by phase windings, i.e., electromagnets, that is higher than the number of magnetic poles of the rotor, which preferably comprises permanent magnets. In such a case, not all stator coils are required to drive the rotor at any given time. However, the rotation of the rotor with the permanent magnets induces a voltage in a stator coil, i.e., a phase winding, which results in a current flow.This stator coil is, in particular, a stator coil that is not energized by the motor control unit at any given time. This induced voltage and / or current depends on the rotational position of the rotor and can thus be used to generate the signal describing the movement state of the tool. This requires no components beyond the essential components of the DC motor, i.e., those required to provide drive power.

[0012] According to a further embodiment, the brushless DC motor is controlled by the motor control unit using a so-called field-oriented control (FOC). Field-oriented control is sometimes also referred to as vector control. Field-oriented control uses motor current waveforms, i.e. control currents for the brushless DC motor, as input values. With three-phase control, three motor current waveforms are used. From the motor current waveforms, a value representing a magnetic flux density and / or a value representing a torque can be calculated. A so-called Clarke transformation can be used for this. These can be controlled to assigned target values ​​using a PI controller and then converted back into voltage values ​​using an inverse Clarke transformation, on the basis of which a commutation signal is provided.Based on the value representing the magnetic flux density and / or the value representing the torque, a rotor position can be calculated and a rotor rotational speed estimated. Thus, a signal describing the tool's motion state can also be generated in this way. The value representing the magnetic flux density is preferably used at a comparatively high speed. At a comparatively low speed, rotor anisotropy can also be utilized.

[0013] According to an additional embodiment, the brushless DC motor is controlled by the motor control unit using a motor model. For this purpose, the motor model, i.e., data describing the behavior of the brushless DC motor, must be stored on the motor control unit. During operation of the brushless DC motor, the motor model is executed, i.e., the behavior of the brushless DC motor is simulated, so to speak, in parallel operation using the motor model. The motor control unit also comprises a controller by means of which an error that occurs between an operating parameter of the actual brushless DC motor and a corresponding operating parameter of the motor model can be regulated to zero. Furthermore, the motor model can be used to generate a signal describing the movement state of the tool, e.g., a rotor position and a rotational speed of the rotor.In simple terms, using the motor model, a rotor position and a rotational speed of the rotor can be determined based on motor current curves, i.e. control currents for the brushless DC motor, and / or motor voltage curves, i.e. control voltages for the brushless DC motor.

[0014] According to one variant, the lighting unit, the control unit, and the signal interface are arranged inside a housing of the hand-held power tool. In other words, the lighting system is integrated into the hand-held power tool. This makes the power tool assembly—in this case, the hand-held power tool with integrated lighting system—easy to handle. Furthermore, the components of the lighting system are protected from unwanted environmental influences inside the housing of the hand-held power tool.

[0015] In another variant, the lighting unit, the control unit, and the signal interface are attached to a carrier unit. In addition, the lighting system is mechanically attached to an outer side of the hand-held power tool via a fastening interface provided on the carrier unit. The lighting system is therefore attached externally to the hand-held power tool. This ensures that the lighting system can be easily retrofitted. It goes without saying that a fastening interface must also be provided on the hand-held power tool in order to be able to attach the lighting system to the hand-held power tool. An adapter element can be used for this purpose, which is firmly connected to an outer side of the hand-held power tool and to the lighting system. Of course, it is also possible for such a machine-tool-side fastening interface to be integrated into the hand-held power tool.

[0016] The hand-held power tool can comprise a machine spindle that is rotatable about a rotational axis. At least one section of the illumination system can extend parallel to a circumference of the machine spindle, at least in part. For example, a section of the illumination system completely encloses the machine spindle. With such a configuration, the illumination system can illuminate an engagement section of the tool of the hand-held power tool along at least two different directions. This makes the engagement section particularly visible.

[0017] Preferably, the section of the lighting system that runs at least partially parallel to the circumference of the machine spindle is spaced from the circumference of the machine spindle. In particular, the distance between the circumference of the machine spindle and the section of the lighting system that runs at least partially parallel to the circumference of the machine spindle can correspond to 1 to 5 times the diameter of the machine spindle. In particular, this distance can be 3 to 4 times the diameter of the machine spindle. In this way, the engagement section of the tool of the hand-held power tool can be particularly well illuminated.

[0018] Furthermore, the lighting system can be arranged within a space spanned by a machine body of the hand-held power tool, a machine table of the hand-held power tool, and linear guide elements of the hand-held power tool. The linear guide elements of the hand-held power tool are also referred to as columns if the hand-held power tool is a router. Consequently, the external dimensions of the hand-held power tool are not increased by the lighting system. The lighting system therefore only marginally affects the handling of the hand-held power tool, or does not affect it at all. The machine tool can be a router. Therefore, thanks to the lighting system, the router cutters are clearly visible during operation. This allows for precise and higher-quality work results.

[0019] The object is further achieved by a lighting system for a machine tool assembly according to the invention. The lighting system comprises:

[0020] - the lighting unit with at least one light source, wherein the lighting unit can be aligned such that, in a use state of the lighting system, an engagement section of a tool of the hand-held power tool can be illuminated by means of the light source,

[0021] - the control unit, which is signal-technically connected to the lighting unit, wherein the control unit is designed to operate the lighting unit in a pulsed light mode,

[0022] - the signal interface, which is signal-technically connected to the control unit, wherein the signal interface is designed to receive a signal describing a movement state of the tool, so that in pulsed light operation an illumination state can be matched to the movement state by means of the control unit.

[0023] The control unit, which is designed to operate the lighting unit in pulsed light mode, and the signal interface make it possible to coordinate the operation of the lighting system with the operation of the hand-held power tool on which it is used. In this context, the signal received at the signal interface, which describes the movement state of the tool, can be received by a sensor unit that is a component of the lighting system. This will be explained in more detail below. Alternatively, it is possible for the signal received at the signal interface, which describes the movement state of the tool, to be provided by the associated hand-held power tool. This naturally requires that the associated hand-held power tool has a corresponding signal interface, by means of which such a signal can be tapped, for example, from the motor control of the hand-held power tool.In particular, in this context, the signal describing the movement state of the tool can be provided by a motor control unit designed to control a brushless DC motor. Both variants make it possible to make the moving tool, which is normally not clearly perceptible to the human eye because the movement of the tool is too fast and therefore cannot be resolved by the human eye, perceptible to the human eye, i.e., clearly visible. In this context, light pulses are generated that are essentially synchronized with the movement of the tool. In other words, the at least one light source is switched on only for a comparatively short period of time.In the case of a periodic movement of the tool, which can be rotary, translatory, or a combination thereof, the frequency of the light pulses can essentially correspond to the frequency of the periodic movement of the tool. Of course, it is also possible for the frequency of the light pulses to be an integer multiple or an integer divisor of the frequency of the periodic movement of the tool. In the event that the tool has multiple cutting edges, the frequency of the light pulses can be selected such that it corresponds to a multiple of the frequency of the periodic movement of the tool corresponding to the number of cutting edges. In this way, the cutting edges of the tool are always made visible by a light pulse in the same phase position of the periodic movement. In all variants of pulsed light operation, the outlines of the tool appear sharp to the human eye.This ensures a precise and high-quality work result.

[0024] In this context, it is also important to note that the sharp perception of the tool by the human eye is essentially achieved by the fact that in pulsed light operation the light pulses have a comparatively short pulse duration. However, a comparatively small number of these comparatively short light pulses can result in the tool being perceived as comparatively dark by the human eye. In order for the tool to be perceived as brighter, a comparatively large number of these comparatively short light pulses must be generated. In other words, the brightness of the perception of the tool can be adjusted by the number of light pulses. In all cases, the illumination frequency must be selected to be high enough that the individual light pulses cannot be resolved by the human eye.

[0025] In one variant, the signal interface and the control unit are designed as an integral unit. This means that the signal interface is designed as a component of the control unit. This is structurally particularly simple and also saves space.

[0026] Preferably, each of the light sources comprises a light-emitting diode (LED). Optionally, one or more of the light sources can be equipped with an optical unit. The optical unit is designed to direct the light generated by the light source specifically onto the engagement section of the tool of the hand-held power tool. The optical unit comprises, for example, a lens and / or a diffuser.

[0027] The lighting unit may comprise one or more light sources.

[0028] The lighting system according to the invention can be specifically designed for use on a hand-held power tool that is a router. In this case, the lighting system is a router lighting system. Alternatively, the lighting system according to the invention can be specifically designed for use on a hand-held power tool that is a saw. In this case, the lighting system is a saw lighting system. Furthermore, it is possible for the lighting system according to the invention to be specifically designed for use on a hand-held power tool that is a grinder. In this case, the lighting system is a grinder lighting system. In this context, the grinder can be designed as an eccentric sander. It is also possible for the lighting system according to the invention to be specifically designed for use on a hand-held power tool that is a drill.In this case, the lighting system is a power drill lighting system. According to a further alternative, the lighting system according to the invention can be specifically designed for use on a handheld power tool that is an oscillating multi-tool. In this case, the lighting system is a multi-tool lighting system. Oscillating multi-tools can also simply be referred to as oscillators.

[0029] The control unit can be configured to operate the lighting unit in continuous light mode. In this operating mode, the engaging portion of the tool is continuously illuminated. This is useful, for example, when the tool is moving relatively slowly or not at all. Continuous light mode ensures particularly good visibility of the engaging portion.

[0030] Alternatively or additionally, the signal interface can be configured to be signal-coupled to a motor control unit to receive the signal describing the movement state of the tool, wherein the motor control unit is configured to control a brushless DC motor. In this way, the signal describing the movement state of the tool can be reliably received at the signal interface. The signal describes a working frequency of the tool and / or a tool position of the tool. The operation of the lighting system can thus be reliably coordinated with the movement state of the tool.

[0031] In this context, the brushless DC motor is, in particular, sensorless. This means that the DC motor, in particular, does not have a sensor designed to detect a relative position of a rotor of the DC motor with respect to a stator of the DC motor. Furthermore, this means, in particular, that the DC motor does not have a sensor designed to detect a rotational speed of the rotor relative to the stator. Such brushless and sensorless DC motors are therefore very simply constructed. Therefore, they are robust and reliable in operation. As already explained, the signal describing the movement state of the tool can be based on a control signal for the brushless DC motor provided by the motor control unit.Alternatively or additionally, the signal describing the movement state of the tool can be based on a feedback signal transferred from the brushless DC motor, in particular from the stator of the brushless DC motor, to the motor control unit. The signal describing the movement state of the tool can therefore be derived from a control signal for the brushless DC motor provided by the motor control unit. Alternatively or additionally, the signal describing the movement state of the tool can be derived from a feedback signal transferred from the brushless DC motor, in particular from the stator of the brushless DC motor, to the motor control unit. In this way, the signal describing the movement state of the tool can be determined easily and reliably.

[0032] According to one variant, the control signal can describe a motor current curve and / or a motor voltage curve. Alternatively or additionally, the feedback signal can describe an induced voltage curve and / or an induced current curve. The motor current curve and / or the motor voltage curve are present in the motor control unit, as they are required to control the brushless DC motor. The motor voltage curve is described, for example, using a phase angle. Accordingly, no further sensors are required to generate the signal describing the movement state of the tool. In particular, no Hall sensors or encoders are necessary. The feedback signal is also a signal that is provided by essential components of the DC motor, i.e. those required to provide drive power, and is therefore also present in the motor control unit.This means that no dedicated sensor is required to provide the feedback signal. In other words, the signal describing the tool's motion state can be generated sensorlessly. This is structurally particularly simple and efficient. It also offers advantages in terms of installation space. The machine tool assembly can therefore be designed compactly.

[0033] In one embodiment, the lighting system comprises a power interface for supplying the lighting unit and / or the control unit with electrical energy. The power interface serves to feed energy into the lighting unit and / or the control unit. The power interface can be wired or wireless. According to a first variant, the power supply to the handheld power tool is ensured via a power-conducting connection, which can also be wired or wireless. In this case, the power interface and the fastening interface can be combined, so that when the lighting system is mechanically connected to the handheld power tool, the power supply to the lighting system is ensured at the same time. Alternatively, the power interface can be designed to be supplied with energy from a separate energy storage device.In both variants, the lighting unit and / or the control unit can be reliably supplied with energy.

[0034] The lighting system may further comprise an electrical energy storage unit coupled to the energy interface. The electrical energy storage unit may or may not be rechargeable. The electrical energy storage unit may be permanently installed in the lighting system or detachably connected to the other components of the lighting system. In the latter case, the electrical energy storage unit may be referred to as removable or replaceable. If the electrical energy storage unit is permanently installed, it requires a charging interface to be recharged. The charging interface may be wireless or wired. Of course, a charging interface may also be provided if the electrical energy storage unit is removable or replaceable. This opens up the possibility of charging the electrical energy storage unit within the lighting system.In all of these cases, the lighting system is self-sufficient in terms of its power supply, meaning that an electrical power supply from the handheld power tool is not necessary. This facilitates retrofitting the lighting system.

[0035] According to one variant, an energy harvesting unit is connected to the energy interface. The energy harvesting unit is designed in particular to generate electrical energy from movements of the lighting system and / or the hand-held power tool connected to the lighting system. The energy harvesting unit can be used instead of an electrical energy storage unit or in combination with an electrical energy storage unit. In the first alternative, replacing or recharging the electrical energy storage unit is therefore unnecessary. In the second alternative, the electrical energy storage unit only needs to be replaced or recharged comparatively rarely. Both of these simplify the use of the lighting system.

[0036] The lighting system can further comprise a support unit. The support unit has a fastening interface for optional mechanical fastening of the support unit to an outer side of the hand-held power tool. The lighting unit and the control unit are fastened to the support unit. In this variant, the lighting system can therefore be designed as a self-contained unit. In particular, the lighting system can be designed as an independent unit relative to the hand-held power tool to which it can be attached. In this context, the lighting system can also be designed as a so-called attachment component. The lighting system is therefore particularly well suited for retrofitting to hand-held power tools.The age of the hand-held power tool is not important, so that such a lighting system can easily be designed to be both forward and backward compatible. Thanks to the fastening interface of the carrier unit, the lighting system can be mechanically securely fastened to the outside of the hand-held power tool. Such fastening can be direct, i.e. the carrier unit is connected directly to the outside of the hand-held power tool. Alternatively, an adapter element can be provided which mechanically connects the outside of the hand-held power tool and the carrier unit. The fastening of the lighting system according to the invention can be quick and uncomplicated. The same applies to separating the lighting system according to the invention from a hand-held power tool. Consequently, the lighting system can be used quickly and easily on different hand-held power tools.

[0037] In the present case, any side of the hand-held power tool is understood as the outside of the hand-held power tool that is accessible from the outside, ie without dismantling one or more components of the hand-held power tool.

[0038] According to one embodiment, the fastening interface comprises at least one of a bayonet connection element, snap hook, connecting magnet, fastening opening, fastening thread, fastening bolt, and hook-and-loop fastening element. In all of these variants, the carrier unit can be attached to the exterior of the handheld power tool in a mechanically stable manner.

[0039] In one embodiment, the carrier unit has at least one annular or annular-part-shaped section. The annular or annular-part-shaped section extends at least partially around a central axis. When the lighting system is in use, this axis can coincide with a tool axis, i.e., a rotation axis, oscillation axis, or lifting axis of the tool, or with an axis of a drive element for the tool. In other words, the tool or an associated drive element is accommodated in an interior of the annular or annular-part-shaped section. This allows the tool or the drive element to be illuminated from multiple sides. This avoids shadows and other undesirable lighting influences.If the support unit comprises a ring-shaped section, a recess that completes the ring-shaped section to form a complete ring can be used to transfer the tool or drive element into the interior of the ring-shaped section during assembly of the lighting system. Such a support unit can therefore be mounted particularly easily on an associated hand-held power tool.

[0040] The lighting unit can comprise multiple light sources. The light sources can be arranged along an arc. This arc can be, for example, a circular arc or an elliptical arc. This results in particularly uniform illumination. Furthermore, shadows and other undesirable lighting effects are avoided.

[0041] According to one example, the signal interface is designed to receive, as a signal describing the movement state of the tool, at least one of a signal describing an operating frequency of the tool and a signal describing a tool position of the tool. An operating frequency is always suitable for describing the movement state of the tool when the tool executes a periodic movement. If the tool rotates, the rotation frequency is the operating frequency. If the tool oscillates, the oscillation frequency is the operating frequency. If the tool moves periodically in a translational manner, the stroke frequency is the operating frequency. The tool position can be a translational position or a rotational position of the tool. If the tool executes a periodic movement, the tool position is also understood to mean a phase position.Consequently, the illumination of the tool's engagement section can be dependent on the tool's operating frequency and / or the tool position. In one example, where the tool moves periodically and an illumination frequency in pulsed light mode essentially corresponds to the associated operating frequency or is an integer multiple thereof, the effect of an optically stationary tool is created. As already explained, the tool appears sharp to the human eye. This enables a precise and high-quality machining result. In another example, the illumination sequence corresponds to the operating frequency multiplied by the number of cutting edges of the tool. The same effects are achieved.

[0042] The lighting system can comprise a sensor unit, wherein the sensor unit is configured to detect the operating frequency and / or the tool position and to generate the signal describing the operating frequency and / or the tool position, and is signal-coupled to the signal interface. The lighting system can thus generate signals describing the operating frequency and / or the tool position. It is therefore not necessary to use the handheld power tool for this purpose. This increases the compatibility of the lighting system with different handheld power tools. Furthermore, the installation effort is reduced, since essentially only a mechanical coupling between the lighting system and the handheld power tool is required.

[0043] According to one embodiment, the sensor unit comprises a carrier-unit-side sensor element that is attached to the carrier unit. Since the carrier unit is typically stationary, the operating frequency and / or the tool position can be reliably detected using such a sensor element.

[0044] In one example, the sensor element on the carrier unit side comprises a Hall sensor or an induction coil. This allows for simple and reliable sensor detection of the operating frequency and / or tool position of a magnetically coded tool. The tool itself, e.g., a milling cutter, drill, or saw blade, can be magnetically coded or connected to a magnetically coded element. Alternatively or additionally, a tool holder can be magnetically coded.

[0045] In another example, the sensor element on the carrier unit side comprises a proximity sensor, which operates inductively, for example. In this way, an operating frequency and / or a tool position of a tool coded by means of recesses and / or elevations can be easily and reliably detected by sensors. The tool itself, e.g., a milling cutter, drill, or saw blade, can be coded by means of recesses and / or elevations or can be connected to a coded element on which recesses and / or elevations are formed. Alternatively or additionally, a tool holder is coded by means of recesses and / or elevations.

[0046] In another example, the sensor element on the carrier unit side comprises an optical sensor. In this way, an operating frequency and / or a tool position of an optically coded tool can be easily and reliably detected by sensor. The tool itself, e.g., a milling cutter, drill, or saw blade, can be optically coded or connected to an optically coded element. Alternatively or additionally, a tool holder is optically coded. The optical coding relates, for example, to zones of different surface reflectivity or to zones otherwise coded with different optical properties. In this context, the optical coding can be provided specifically and exclusively for interaction with the optical sensor of the sensor element on the carrier unit side.Alternatively, existing structural elements on the tool or tool holder that have a different surface reflectivity or other optical properties than other structural elements can be used as optical coding. In this context, for example, a spindle stop hole can be used as optical coding.

[0047] The sensor unit can also comprise a tool-side sensor element that can be coupled to the tool or a drive element coupled to the tool, or that can be integrated into the tool or the drive element. The tool-side sensor element interacts with the carrier-unit-side sensor element. As already mentioned, the tool-side sensor element can be a magnetic sensor element. Alternatively, the tool-side sensor element can have elevations and / or depressions. Further alternatively, the tool-side sensor element can comprise an optical coding. In all variants, an operating frequency and / or a tool position can be reliably and precisely detected. The tool-side sensor element can be annular and have a fastening interface on an inner circumference of the ring for coupling to the tool or the drive element.This allows the tool-side sensor element to be easily and reliably connected to the tool or an associated drive element. This makes the lighting system compatible with a wide variety of handheld power tools.

[0048] According to one embodiment, at least one of an illumination frequency and an illumination phase position can be tuned to the movement state of the tool by means of the control unit in pulsed light operation. As already mentioned, the impression of a stationary tool can be created by means of a tuned illumination frequency, whereby the tool is displayed in optical focus. Furthermore, a position of the tool can be variably adjusted by means of a tuned illumination phase position, in which the tool is visually perceived as if it were stationary. Overall, the state in which the tool is displayed in focus can therefore be selected relatively freely and changed relatively flexibly. This allows the display to be tailored to a specific hand-held power tool and / or a specific machining task.

[0049] The lighting system can have an adjustment means for manually modifying at least one of the illumination frequency and the illumination phase in pulsed light mode, wherein the adjustment means is signal-connected to the control unit. Thus, a user can variably adjust the illumination characteristic. This allows the user to always select the illumination characteristic that seems appropriate in relation to the handheld power tool to which the lighting system is coupled and the machining task to be performed. This further increases the visibility of the tool's engagement section.

[0050] In this context, for example, an illumination phase can be understood relative to a tool position, in particular to a phase position of the tool. The illumination phase can be modified by increasing or decreasing a time offset between the receipt of a sensor signal describing the tool position and the switching on of a light pulse. This applies if the tool moves at an at least temporarily constant operating frequency, e.g. rotation frequency, oscillation frequency or stroke frequency. In a case in which the operating frequency of the tool fluctuates, e.g. due to a load acting on the tool, the time offset between the receipt of the sensor signal and the switching on of the light pulse must also be adapted to the current operating frequency so that illumination that is independent of the operating frequency, i.e. that remains constant even with a changing operating frequency, can be achieved.In this context, the user can use the adjustment device to set a desired tool position, e.g., rotational position, oscillation position, or stroke position, in which the tool should appear when illuminated in pulsed light mode. From this specified tool position and a current operating frequency, which is determined based on the detection results of the sensor unit described above, the necessary time offset between the sensor signal and the light pulse can be continuously calculated, for example, using the control unit. Consequently, the tool can be illuminated in such a way that it is perceived as sharp and stationary by the human eye, even with fluctuating operating frequencies.

[0051] In one example, the adjustment means is designed as a rocker switch. The rocker switch can comprise two switching elements, one of which serves to increase at least one of the lighting frequency and lighting phase, and the other switching element serves to decrease the other of the lighting frequency and lighting phase. Alternatively, it is of course also possible to use one or more switches. In a further alternative, the adjustment means comprises capacitive touch sensors or ultrasonic touch sensors.

[0052] The lighting system can comprise one or more additional control elements, wherein the one or more additional control elements are connected to the control unit via signal technology. For example, an additional control element is designed to manually modify the brightness of the lighting. If the light sources are controlled with a pulse-width-modulated signal, the brightness can be adjusted by manipulating the pulse width.

[0053] Alternatively or additionally, one of the additional control elements is designed to allow manual switching between different operating modes of the lighting system. In this context, for example, switching between continuous light mode and pulsed light mode is possible.

[0054] Another further control element can be designed to switch the lighting system on and / or off.

[0055] The same types of switches that were explained in connection with the setting device can be used for the one or more additional control elements.

[0056] Furthermore, it is understood that individual control elements can be assigned multiple functions, for example by distinguishing between different activation times and / or by evaluating multiple activations (e.g. “double click”).

[0057] According to one embodiment, all operating elements are arranged such that they can be activated during operation of the hand-held power tool to which the lighting system is coupled. Optionally, a mechanical protective element is provided, positioned between the respective operating element and a working zone of the hand-held power tool, so that a human finger or hand used to operate the adjustment means cannot accidentally enter the area of ​​the tool, i.e., a danger zone. This increases the operational reliability of the hand-held power tool.

[0058] The lighting system may include a display unit for displaying at least one of the operating status of the lighting system, warning messages, error messages, and user feedback. If an electrical energy storage unit is present, the charge level of the electrical energy storage unit may also be displayed. In this way, a user of the lighting system is always informed about the operating status of the lighting system itself and / or components of the lighting system.

[0059] In one variant, the display unit comprises at least one display means separate from the lighting unit, which is in particular fastened to the carrier unit. Alternatively, the display unit can be provided on an outer side of the hand-held power tool. This allows a display to be provided regardless of the switched-on state of the lighting unit. The display means comprises, for example, a light-emitting diode (LED), a light guide, a display, a light guide arc, or a light guide ring, which can be designed as a fiber optic tube. Preferably, the display means is designed as a light guide arc, which is arranged on an outer circumference of the carrier element. Combinations of these examples are of course also possible. The display means can also be designed to generate displays in different colors. In this context, for example, displays related to potentially dangerous operating conditions can be shown in red.Other displays can be displayed in green.

[0060] In one example, the display means of the lighting unit is designed as a circumferentially closed light guide ring. The light guide ring is attached to the support unit or provided on an outer side of the handheld power tool in such a way that it is clearly visible to a user of the lighting system, and in particular to a user of a handheld power tool to which the lighting system is attached, during operation of the lighting system and / or the handheld power tool. If present, the support unit can be attached to the handheld power tool in such a way that a tool or a machine spindle extends through the interior of the light guide ring, i.e., an area surrounded by the light guide ring.This means that a user of the handheld power tool to which the lighting system is attached, looking at the tool or the machine spindle, can see the light guide ring and the light emanating from it, regardless of the direction from which they are looking. The same applies if the lighting system is integrated into the handheld power tool. A display designed as a light guide ring is therefore very clearly visible.

[0061] In another example, the display means of the lighting unit is designed as a light guide arc. The light guide arc is attached to the support unit or provided on an outer side of the hand-held power tool in such a way that it is clearly visible to a user of the lighting system, and in particular to a user of an associated hand-held power tool, during operation of the lighting system and / or the hand-held power tool. The support unit can be attached to the hand-held power tool or provided in such a way that the light guide arc partially extends around a tool or a machine spindle. The light guide arc is arranged such that it and / or the light emanating from the light guide arc is in the user's field of vision when the user looks at the tool or the machine spindle from the most common directions. A display means designed as a light guide arc is therefore clearly visible.

[0062] According to an alternative, at least one light source of the lighting unit is a display means of the display unit. This means that at least one light source serves both to illuminate the engaging portion of the tool and as a display means. In other words, this light source serves two functions. This allows the lighting system to be constructed comparatively compactly.

[0063] In one variant, the lighting system comprises a safety sensor unit attached to the carrier unit. The safety sensor unit is designed to detect a human finger or a human hand in the area of ​​the carrier unit. Furthermore, the safety sensor unit is signal-coupled to the control unit, so that an operating state of the lighting unit can be adjusted depending on a detection result of the safety sensor unit. The safety sensor unit comprises, for example, a capacitive sensor or a group of capacitive sensors. By means of the safety sensor unit, a human finger and / or a human hand located near the tool, i.e. near a danger zone, can thus be detected.Since the safety sensor unit is coupled to the control unit, and the lighting unit is also coupled to the control unit, the lighting system can be operated based on a detection result from the safety sensor unit. For example, based on a detection result from the safety sensor unit, lighting can be switched from pulsed light mode to continuous light mode. Alternatively or additionally, it is possible for a warning message to be issued via the lighting system.

[0064] It is understood that all features, effects and advantages mentioned in connection with the lighting system also apply to the machine tool assembly and vice versa.

[0065] The invention is explained below using various embodiments shown in the accompanying drawings. They show:

[0066] Figure 1 shows a machine tool assembly according to the invention comprising a hand-held machine tool designed as a router and a lighting system according to the invention,

[0067] Figure 2 shows the lighting system from Figure 1 in a separate view along direction II in Figure 1,

[0068] Figure 3 shows the lighting system of Figure 2 in a view along the direction III in Figure 2,

[0069] Figure 4 shows a variant of the lighting system from Figures 1 to 3,

[0070] Figure 5 shows an adapter element for mechanically connecting an outer side of the hand-held power tool and the lighting system from Figures 1 to 3, Figure 6 shows a tool-side sensor element of the lighting system from Figures 1 to 4, Figure 7 shows a lighting system according to the invention according to another embodiment in a representation corresponding to the representation in Figure 3,

[0071] Figure 8 shows an adapter element according to a further embodiment for mechanically connecting an outer side of the hand-held power tool and the lighting system of Figure 7, and

[0072] Figure 9 shows a machine tool assembly according to the invention according to a further embodiment, comprising a hand-held machine tool designed as a router, and a lighting system according to the invention.

[0073] Figure 1 shows a machine tool assembly 10 comprising a hand-held machine tool 12, which in the examples shown is designed as a router.

[0074] The hand-held power tool 12 comprises a machine body 14 on which a handle section 16 is formed.

[0075] Furthermore, a drive unit 18 is arranged in the machine body 14.

[0076] The drive unit 18 comprises an electric motor by means of which a machine spindle 20 can be driven in rotation. The machine spindle 20 is rotatable about a rotation axis A.

[0077] In the present case, the drive unit 18 comprises an electric motor designed as a brushless and sensorless DC motor and a motor control unit which is signal-coupled to the brushless DC motor in order to control it.

[0078] In the example shown, a tool 22 is drive-coupled to the machine spindle 20.

[0079] Since the hand-held power tool 12 is a router, the tool 22 is a milling cutter. The hand-held power tool 12 further comprises a machine table 24, which is spaced apart from the machine body 14 and is translationally displaceable relative to the machine body 14 via linear guide elements 26.

[0080] An opening 28 is provided in the machine table 24, the central axis of which is arranged concentrically to the rotation axis A. The rotation axis A can thus also be regarded as a central axis of the opening 28.

[0081] The machine table 24 comprises a sliding surface 30 which is designed to be applied to a workpiece to be machined, not shown in detail in the figures, or to a guide device during operation of the hand-held machine tool 12.

[0082] The machine table 24 and the opening 28 are arranged such that during operation of the hand-held machine tool 12, the tool 22 can pass through the opening 28 in order to machine the workpiece.

[0083] The machine tool assembly 10 further comprises a lighting system 32. This is shown separately from the hand-held power tool 12 in Figures 2 and 3. Compared to the installation situation shown in Figure 1, a tool-side sensor element 34 of the lighting system 32 is shown offset from the other components of the lighting system 32 for better visibility.

[0084] The lighting system 32 comprises a support unit 36.

[0085] In the illustrated embodiment, the support unit 36 ​​is designed as a housing. This means that the support unit encloses a space in which further components of the lighting system 32 are arranged, as will be explained below.

[0086] The carrier unit 36 ​​comprises an annular section 38 and a cuboid section 40 integrally connected thereto.

[0087] The annular section 38 and the cuboid section 40 merge into one another. In this case, the annular section 38 is circular.

[0088] In the examples shown, the carrier unit 36 ​​is designed as a plastic assembly. This means that the carrier unit 36 ​​is composed of several plastic components.

[0089] The carrier unit 36 ​​is designed, on the one hand, to optionally mechanically fasten the lighting system 32 to an outer side of the hand-held power tool 12.

[0090] For this purpose, the carrier unit 36 ​​comprises a fastening interface 42.

[0091] In the illustrated embodiment, the fastening interface 42 comprises two bead-shaped fastening projections 44a, 44b. These are both positioned on an outer circumference of the annular portion 38 of the carrier unit 36.

[0092] The fastening interface 42 of the lighting system 32 is designed to interact with a fastening interface 46 on the machine tool side.

[0093] The machine tool-side fastening interface 46 is formed on an adapter element 48, which can be seen in detail in Figure 5.

[0094] The adapter element 48 comprises a ring-shaped base body 50 which is provided with openings 52.

[0095] The adapter element 48 can thus be fastened to the machine body 14 by means of screws (not shown in detail) which are inserted through the openings 52.

[0096] In addition, the adapter element 48 has two snap hooks 54a, 54b.

[0097] The snap hooks 54a, 54b are designed to engage behind a respective associated fastening projection 44a, 44b.

[0098] The adapter element 48 is attached to the machine body 14 such that the rotational axis A coincides with a central axis of the annular portion 38 of the base body 50 (see Figure 1). Accordingly, the support unit 36 ​​can be attached to the hand-held power tool 12 such that the rotational axis A coincides with a central axis of the annular portion 38 of the support unit 36.

[0099] In the assembled state of the lighting system 32, the machine spindle 20 and / or the tool 22 thus extends through a central opening of the annular portion 38 of the carrier unit 36.

[0100] It is understood that the described fastening interface 42 of the lighting system 32 and the described machine-tool-side fastening interface 46 are merely examples. In particular, a kinematic reversal of the described embodiment is conceivable, in which the snap hooks are arranged on the carrier unit 36 ​​of the lighting system 32 and fastening projections are provided on the adapter element 48.

[0101] Furthermore, it is conceivable to design the machine-tool-side mounting interface 46 as a mounting interface integrated into a housing of the hand-held power tool. In this case, no adapter element 48 separate from the hand-held power tool 12 is required.

[0102] The carrier unit 36, on the other hand, is designed to carry further components of the lighting system 32.

[0103] In this context, the lighting system 32 comprises a lighting unit 56.

[0104] The lighting unit 56 comprises a plurality of light sources 58, wherein in the illustrated embodiment each of the light sources 58 comprises an LED.

[0105] The light sources 58 are attached to the annular section 38 of the support unit 36. Thus, the lighting unit 56 can also be said to be attached to the support unit 36. The light sources 58 are arranged along an arcuate line 60 that extends concentrically to the annular section 38 of the support unit 36. Since the annular section 38 is circular, the arcuate line 60 is a closed circular arc. The light sources 58 are evenly distributed around the circumference of the arcuate line.

[0106] The light sources 58, or more generally the lighting unit 56, are aligned such that, in a use state of the lighting system 32 (see Figure 1), the light sources 58 or the lighting unit 56 as a whole can illuminate an engagement section of the tool 22. In this context, an engagement section is understood to be the section of the tool 22 that is intended to interact with a workpiece to be machined.

[0107] In a situation in which the hand-held machine tool 12 is actually used to machine a workpiece, a section of the workpiece that is currently interacting with the tool 22 is of course also illuminated.

[0108] The lighting system 32 further comprises a control unit 62.

[0109] The control unit 62 is also mechanically attached to the carrier unit 36.

[0110] Furthermore, the control unit 62 is signal-connected to the lighting unit 56. In this context, the control unit 62 is signal-connected directly or indirectly to each of the light sources 58.

[0111] In addition, the lighting system 32 includes an electrical energy storage unit 64 coupled to an energy interface 66.

[0112] The energy interface 66 is electrically connected, i.e., conducts energy, to both the lighting unit 56 and the control unit 62. In other words, the control unit 62 and the lighting unit 56 are supplied with electrical energy from the electrical energy storage unit 64 via the energy interface 66. In the illustrated embodiment, the electrical energy storage unit 64 is designed as a rechargeable battery. Accordingly, the electrical energy storage unit includes a charging socket 68, via which the electrical energy storage unit 64 can be charged using a charging cable.

[0113] It is understood that in an alternative, the electrical energy storage unit 64 can also be designed to be charged contactlessly, for example via an inductive charging interface.

[0114] Furthermore, it is understood that alternatively or in addition to the electrical energy storage unit 64, the lighting system 32 may include an energy harvesting unit connected to the energy interface 66.

[0115] Furthermore, the control unit 62 comprises a signal interface 70.

[0116] In addition, the lighting system 32 comprises a sensor unit 72 which is coupled to the signal interface 70, ie is connected to the signal interface 70 in terms of signal technology.

[0117] In the illustrated embodiment, the sensor unit 72 comprises a carrier-unit-side sensor element 74. The carrier-unit-side sensor element 74 is attached to the carrier unit 36. In the illustrated embodiment, the carrier-unit-side sensor element 74 comprises a magnetic sensor, for example, a Hall element. The carrier-unit-side sensor element 74 is arranged on the carrier unit 36 ​​such that it can detect a magnetic flux in an interior region of the annular portion 38 of the carrier unit 36.

[0118] In addition, the sensor unit 72 includes the tool-side sensor element 34.

[0119] The tool-side sensor element 34 is annular in the illustrated embodiment (see also Figure 6). It has a fastening interface 78 on an inner circumference of the ring, by means of which the tool-side sensor element 34 can be coupled to the tool 22 or to the machine spindle 20.

[0120] In the illustrated embodiment, the tool-side sensor element 34 is clamped onto the machine spindle 20.

[0121] Generally speaking, the machine spindle 20 represents a drive element coupled to the tool 22.

[0122] In addition, two permanent magnetic elements 80a, 80b are integrated diametrically opposite each other in the annular, tool-side sensor element 34.

[0123] During operation of the hand-held power tool 12 and the lighting system 32, the two permanent magnetic elements 80a, 80b can thus be detected by means of the sensor element 74 on the carrier unit side.

[0124] Thus, a rotational tool position of the tool 22, i.e. a rotational position of the tool 22, can be detected.

[0125] Furthermore, a working frequency of the tool 22 can be detected in this way. Since the tool 22 is a rotating tool, the working frequency in this case is a rotational frequency.

[0126] In other words, the sensor unit 72 is designed to detect the working frequency and the tool position and to generate a signal describing the working frequency and a signal describing the tool position.

[0127] The signal describing the operating frequency and the signal describing the tool position are provided at the signal interface 70. The signal interface 70 is thus configured to receive a signal describing a movement state of the tool 22. More specifically, the signal interface 70 is configured to receive a signal describing the operating frequency of the tool 22 and a signal describing the tool position of the tool 22.

[0128] On this basis, the lighting unit 56 can be controlled in pulsed light mode using the control unit 62. This means that the light sources 58 are selectively switched on for a comparatively short period of time and then switched off again. In other words, the control unit 62 is designed to operate the lighting unit 56 in pulsed light mode.

[0129] The lighting state can be adjusted to the movement state of the tool 22, ie to the working frequency of the tool 22 and the tool position of the tool 22.

[0130] In a case where the tool 22 rotates so fast that this rotational movement can no longer be resolved by the human eye, the tool 22 appears to a person in the form of a blurred external silhouette.

[0131] In such a situation, the tool 22 can be illuminated by means of pulsed light operation in such a way that it is perceived by the human eye as sharp and stationary.

[0132] Thus, by means of pulsed light operation, the tool 22, which is not clearly visible to the human eye, can be made clearly visible.

[0133] For this purpose, the tool 22 is illuminated, for example, at a frequency that corresponds to the working frequency of the tool 22, an integer multiple of the working frequency, or an integer divisor of the working frequency of the tool 22. In this context, the frequency of illumination refers to how often the light sources 58 are switched on and off again within a predetermined time interval. The frequency of illumination can also be referred to as the illumination frequency.

[0134] In an example in which the tool 22 rotates 6000 times per minute, i.e. the operating frequency is 100 Hz, the tool 22 can be illuminated by the light sources 58 at a frequency of 200 Hz, for example. The tool 22 is therefore illuminated in flashes 200 times per second. As a result, the tool 22 appears to a user to be stationary and always in the same position. The times of the flash-like illumination, i.e. the pulse duration of a light pulse, are chosen to be comparatively short. The comparatively short pulse duration means that the tool 22 is perceived as sharp by the human eye. The fact that at an illumination frequency of 200 Hz significantly more light pulses are generated than can be resolved by the human eye means that the tool 22 is perceived as bright by the human eye.

[0135] In the example shown, the illumination frequency in pulsed light mode is fixed by the control unit 62.

[0136] The lighting system 32 further comprises an adjustment means 82, which in the illustrated embodiment is designed as a rocker switch.

[0137] The adjustment means 82 is designed to adjust a phase offset between the operating frequency of the tool 22 and the illumination frequency. In other words, an illumination phase position can be adjusted.

[0138] For this purpose, the setting means 82 is connected to the control unit 62 in terms of signals.

[0139] By adjusting the phase offset, i.e., the illumination phase position, a user can select the rotational position of the tool 22 in which the tool 22 is perceived as stationary, contrary to reality. In this respect, the control unit 62 can also adjust the illumination state to the movement state of the tool 22 in pulsed light mode.

[0140] The lighting system 32 also includes a safety sensor unit 84.

[0141] The safety sensor unit 84 is also attached to the carrier unit 36.

[0142] In addition, the safety sensor unit 84 is signal-technically coupled to the control unit 62.

[0143] In the present case, the safety sensor unit 84 is designed as a capacitive sensor unit and comprises an electrode 86 which extends along the annular section 38 of the carrier unit 36.

[0144] In this way, a human finger or a human hand can be detected in the area of ​​the carrier unit 36, more precisely in the area of ​​the carrier unit 36 ​​equipped with the electrode 86.

[0145] Generally speaking, an operating state of the lighting unit 56 can be set in this way depending on a detection result of the safety sensor unit 84.

[0146] In addition, the lighting system 32 includes a display unit 88 which is attached to the support unit 36.

[0147] The display unit 88 is signal-coupled to the control unit 62.

[0148] The display unit 88 serves to display at least one of an operating state of the lighting system 32, a warning message, an error message and user feedback.

[0149] In the present case, the display unit 88 comprises a display means 90 separate from the lighting unit 56. In the illustrated embodiment, the display means 90 is designed as a light guide arc that can optionally illuminate in red, green, or blue. Furthermore, the light guide arc is designed to operate selectively in continuous light mode and flashing light mode. The light guide arc extends along a circumference of the annular portion 38 of the support unit 36.

[0150] More precisely, the light guide arc extends over a 180-degree section of the circumference of the annular portion 38. The light guide arc is positioned such that, with respect to a working direction of the hand-held power tool 12, which runs essentially parallel to the longitudinal extension of the handle from section 16, it extends from a left side of the hand-held power tool 12 to a right side of the hand-held power tool 12. The working direction of the hand-held power tool 12 thus intersects the light guide arc centrally. In other words, the light guide arc is positioned symmetrically with respect to the working direction. Consequently, the light guide arc is clearly visible from both the left side of the hand-held power tool 12 and the right side of the hand-held power tool.

[0151] It should be understood that the 180-degree extension of the fiber optic arc is to be understood as an example. The fiber optic arc can also extend over any other angle between 90 degrees and 270 degrees, for example, over 120 degrees or over 240 degrees. The fiber optic arc is clearly visible in these examples as well.

[0152] According to another example, instead of a single light guide arc, several smaller light guide arcs are provided, distributed around the circumference of the annular section 38 in such a way that a user can always clearly see at least one light guide arc, regardless of their viewing direction. For example, at least two light guide arcs can be provided, arranged on opposite sides of the annular section.

[0153] In the illustrated embodiment, the light guide arc glows continuously red when the control unit 62 issues an error message. Furthermore, the light guide arc flashes red when the lighting system 32 is operating in pulsed light mode. This warns a user not to reach into the tool 22, which only appears to be stationary in pulsed light mode. The flashing red light guide arc thus simultaneously indicates an operating status and a warning.

[0154] If the lighting system 32 is operated in continuous mode, meaning the light sources 58 are continuously illuminated, the light guide arc can continuously glow green. This informs the user that no particular hazards arise from the operation of the lighting system 32.

[0155] When switching between continuous light mode and pulsed light mode, the light guide arc can flash red and green alternately for a specified number of repetitions. This provides feedback to the user, letting them know that they have switched the operating mode accordingly.

[0156] Furthermore, in the illustrated embodiment, the light guide arc flashes blue when the control unit 62 is establishing a data connection via an optional wireless data interface described in more detail below. Once the data connection is established, the light guide arc can glow blue continuously. This also provides feedback to the user.

[0157] It is understood that the properties of the optical fiber arc are not limited to the luminous colors red, green and blue.

[0158] Furthermore, it is conceivable to use the display unit 88, ie the light guide arc, to also display a warning that the electrical energy storage unit 64 has a low charge level.

[0159] Generally speaking, the display unit 88 can encode information for a user by a luminous color, a luminous type, and whether the display unit 88 is illuminated or not. To further protect against a situation in which a user operating the lighting system 32 in pulsed light mode accidentally reaches into the tool 22 because it appears to be stationary, the control unit 62 can optionally be configured to periodically interrupt the pulsed light mode with continuous light mode. In this way, the illusion of the stationary tool 22 is also interrupted, so that the hazards posed by the rotating tool 22 are more clearly visible to a user.

[0160] According to a further option, the control unit 62 is configured to periodically change the phase shift between the operating frequency and the illumination frequency between two predetermined phase shift values ​​during pulsed light operation. To a user, the tool 22 thus appears alternately in one rotational position associated with a first phase shift value and in another rotational position associated with a second phase shift value. Here, too, the illusion of the stationary tool 22 is periodically interrupted, so that the dangers posed by the rotating tool 22 are more clearly visible to the user.

[0161] Furthermore, the control unit 62 can be designed to interrupt the pulsed light operation if a minimum speed, i.e. a minimum working frequency of the tool 22, is undershot or the hand-held power tool is detected as inactive.

[0162] According to a further option, the lighting system 32 includes a wireless data interface, for example, a Bluetooth interface, Wi-Fi interface, ANT+ interface, GSM interface, or infrared interface. This data interface is coupled to the control unit 62. Furthermore, this interface can be used to configure the lighting system 32. Any data processing device can be used for this purpose, for example, a mobile phone, a tablet, or a laptop computer.

[0163] For example, such a data interface can be used to change basic settings of the

[0164] Illumination system 32. Preferably, the device coupled to the illumination system 32 via the data interface, i.e., the mobile phone, tablet, or laptop computer, has a user interface designed for this purpose. In this context, for example, a basic brightness of the illumination, a number of cutting edges of the tool 22, or a button assignment on the illumination system 32, e.g., for left- or right-handed users, can be set. In this context, the setting means comprises 82 buttons.

[0165] Figure 4 shows a variant of the lighting system 32. In the following, only the differences compared to the embodiment already explained are mentioned.

[0166] The lighting system 32 according to Figure 4, more precisely the carrier unit 36 ​​according to Figure 4, comprises a plate-shaped safety projection 92 in the region of the adjustment means 82 on a side of the adjustment means 82 facing the tool 22. The safety projection 92 projects outwards and prevents a user who actuates the adjustment means 82 from accidentally reaching the region of the tool 22 with his finger or hand.

[0167] Figure 7 shows a lighting system 32 according to an alternative embodiment. Here, only the differences from the previously explained embodiments are discussed.

[0168] The differences here concern the fastening interface 42 of the carrier unit 36 ​​and the fastening interface 46 on the machine tool side. In the embodiment according to Figure 7, the fastening projections 44a, 44b, 44c are no longer bead-shaped, but rather mushroom-shaped. Furthermore, there are now a total of three fastening projections 44a, 44b, 44c.

[0169] The fastening projections 44a, 44b, 44c are each arranged on a circumference of the annular portion 38 of the support unit 36. Furthermore, the fastening projections 44a, 44b, 44c are now positioned on an upper side of the support unit 36, which faces the machine body 14 when the lighting system 32 is mounted on the handheld power tool 12.

[0170] The machine-tool-side mounting interface 46 is also formed for the lighting system from Figure 7 on an adapter element 48. This can be seen in detail in Figure 8.

[0171] The adapter element 48 again comprises a ring-shaped base body 50 which is provided with openings 52 through which the adapter element 48 can be fastened to the machine body 14 by means of screws not shown in detail.

[0172] Instead of the snap hooks 54a, 54b, the adapter element 48 now has a total of three bayonet receptacles 55a, 55b, 55c.

[0173] The bayonet receptacles 55a, 55b, 55c are each designed to be coupled to one of the mushroom-shaped fastening projections 44a, 44b, 44c in order to mechanically couple the carrier unit 36 ​​and the adapter element 48.

[0174] For this purpose, each of the bayonet receptacles 55a, 55b, 55c is designed as an arcuate elongated hole that runs along the circumference of the ring-shaped base body 50.

[0175] Each of the elongated holes has a first region with a first diameter and a second region with a second diameter, the first diameter being larger than the second diameter. The first region and the second region merge into one another.

[0176] The elongated holes are positioned and dimensioned such that one of the fastening projections 44a, 44b, 44c can be inserted into each first region simultaneously. Based on this relative position of the carrier unit 36 ​​and the adapter element 48, the carrier unit 36 ​​and the adapter element 48 can be rotated relative to one another such that each of the fastening projections 44a, 44b, 44c is moved toward a respective associated second region.

[0177] The diameters of the second regions are each smaller than the diameters of the heads of the mushroom-shaped fastening projections 44a, 44b, 44c, but larger than the diameters of the stems of the mushroom-shaped fastening projections 44a, 44b, 44c.

[0178] Consequently, as a result of the relative rotation, the heads of the mushroom-shaped fastening projections 44a, 44b, 44c engage behind the respectively associated second regions.

[0179] Thus, the carrier unit 36 ​​and the adapter element 48 are mechanically reliably but detachably connected to each other.

[0180] Such connections are also called bayonet connections.

[0181] It is understood that the mounting interface 42 of the lighting system 32 described with reference to Figures 7 and 8 and the described machine-tool-side mounting interface 46 are merely examples. In particular, a kinematic reversal of the described embodiment is conceivable as an alternative, in which the bayonet receptacles 55a, 55b, 55c are arranged on the carrier unit 36 ​​of the lighting system 32 and mushroom-shaped mounting projections 44a, 44b, 44c are provided on the adapter element 48.

[0182] Furthermore, it is conceivable to design the machine-tool-side mounting interface 46 as a mounting interface integrated into a housing of the hand-held power tool. In this case, no adapter element 48 separate from the hand-held power tool 12 is required.

[0183] Figure 9 shows a machine tool assembly 10 according to a further embodiment, which again includes a hand-held power tool 12, designed as a router, and a lighting system 32. Only the differences compared to the previously explained embodiments will be discussed below. Otherwise, the above explanations apply.

[0184] In the embodiment according to Figure 9, the lighting system 32 is integrated into the handheld power tool 12. This means that the lighting unit 56, the control unit 62, and the signal interface 70 are now arranged inside a housing of the handheld power tool 12.

[0185] Furthermore, in the embodiment of Figure 9, the signal interface 70 is signal-coupled to the drive unit 18, more precisely to a motor control unit 94, which is designed to control the electric motor of the drive unit 18. In this way, the signal interface 70 can receive the signal describing the movement state of the tool 22, which, as before, describes one of the operating frequency, i.e., a rotational speed, and a tool position, i.e., an angular position, of the tool 22.

[0186] The electric motor is again designed as a brushless DC motor 96.

[0187] Consequently, the signal describing the movement state of the tool 22 can be derived from a control signal for the DC motor 96. Such a control signal is, for example, a motor current curve or a motor voltage curve. The motor current curve and the motor voltage curve are present in the motor control unit 94, in particular as input variables for the DC motor 96. Alternatively, an induced voltage and / or an induced current can be used, which results from the rotation of the DC motor 96 and is measured by the motor control unit 94. The induced voltage and / or the induced current can therefore also be present in the motor control unit 94.

[0188] In other words, in the embodiment of Figure 9, the signal describing the movement state of the tool 22 is provided without a sensor. In comparison to the previously explained embodiment, the tool-side sensor element and the carrier unit-side sensor element can therefore be dispensed with. The machine tool assembly 10 of Figure 9 also has an electrical energy storage unit 64. In contrast to the previously mentioned embodiment, however, this is not limited to supplying the lighting unit 56 with electrical energy, but also serves to supply the drive unit 18 with electrical energy. The electrical energy storage unit 64 can therefore also be regarded as the electrical energy storage unit 64 of the hand-held power tool 12. In other words, the hand-held power tool 12 in the embodiment of Figure 9 is battery-operated or rechargeable.

[0189] Regarding the function of the lighting system 32, reference can be made to the explanations for the aforementioned embodiments. This applies in particular to the adjustment means 82 and the display unit 88, which can also be optionally provided in the embodiment according to Figure 9 and are arranged, for example, on the housing of the hand-held power tool 12.

[0190] List of reference symbols

[0191] 10 Machine tool assembly

[0192] 12 hand-held machine tools

[0193] 14 machine bodies

[0194] 16 Handle section

[0195] 18 Drive unit

[0196] 20 machine spindles

[0197] 22 tools

[0198] 24 machine table

[0199] 26 Linear guide element

[0200] 28 Opening

[0201] 30 sliding surface

[0202] 32 lighting system

[0203] 34 tool-side sensor element

[0204] 36 carrier unit

[0205] 38 annular section of the carrier unit

[0206] 40 cuboid section of the support unit

[0207] 42 Mounting interface

[0208] 44a Mounting projection

[0209] 44b Mounting projection

[0210] 44c mounting projection

[0211] 46 machine tool mounting interface

[0212] 48 adapter element

[0213] 50 Base body of the adapter element

[0214] 52 Opening

[0215] 54a snap hook

[0216] 54b snap hook

[0217] 55a bayonet mount 55b bayonet mount

[0218] 55c bayonet mount

[0219] 56 lighting unit

[0220] 58 Light source

[0221] 60 arc line

[0222] 62 Control unit

[0223] 64 electrical energy storage units

[0224] 66 Energy interface

[0225] 68 Charging socket

[0226] 70 Signal Interface

[0227] 72 Sensor unit

[0228] 74 carrier unit-side sensor element

[0229] 78 Mounting interface

[0230] 80a permanent magnetic element

[0231] 80b permanent magnetic element

[0232] 82 Adjustment tools

[0233] 84 Safety sensor unit

[0234] 86 Electrode

[0235] 88 display unit

[0236] 90 display devices

[0237] 92 Safety advantage

[0238] 94 Engine control unit

[0239] 96 brushless DC motor

[0240] A Rotation axis of the machine spindle, center axis of the opening in the machine table, center axis of the ring-shaped section of the base body of the adapter element, center axis of the ring-shaped section of the carrier unit

Claims

Patent claims 1. A machine tool assembly (10) comprising a hand-held machine tool (12) having an electric drive unit (18) with a brushless DC motor (96) and with a motor control unit (94) signal-coupled to the brushless DC motor (96), and a lighting system (32), wherein the brushless DC motor (96) is in particular sensorless and wherein the lighting system (32) comprises: - a lighting unit (56) with at least one light source (58), wherein the lighting unit (56) is aligned or alignable such that, in a use state of the lighting system (32), an engagement section of a tool (22) of the hand-held power tool (12) can be illuminated by means of the light source (58), - a control unit (62) which is signal-technically connected to the lighting unit (56), wherein the control unit (62) is designed to operate the lighting unit (56) in a pulsed light mode, - a signal interface (70) which is signal-technically connected to the control unit (62), wherein the signal interface (70) is designed to receive a signal describing a movement state of the tool (22), so that in pulsed light operation, an illumination state can be matched to the movement state by means of the control unit (62).

2. Machine tool assembly (10) according to claim 1, wherein the signal interface (70) for receiving the signal describing the movement state of the tool (22) is signal-technically coupled to the motor control unit (94).

3. Machine tool assembly (10) according to claim 2, wherein the signal describing the movement state of the tool (22) is based on a control signal for the brushless DC motor (96) provided by the motor control unit (94) and / or wherein the signal describing the movement state of the The signal describing the tool (22) is based on a feedback signal transferred from the brushless DC motor (96) to the motor control unit (94).

4. Machine tool assembly (10) according to claim 3, wherein the control signal describes a motor current curve and / or a motor voltage curve and / or wherein the feedback signal describes an induction voltage curve and / or an induction current curve.

5. Machine tool assembly (10) according to one of the preceding claims, wherein the lighting unit (56), the control unit (62) and the signal interface (70) are arranged in an interior of a housing of the hand-held machine tool (12).

6. Machine tool assembly (10) according to one of claims 1 to 4, wherein the lighting unit (56), the control unit (62) and the signal interface (70) are fastened to a carrier unit (36) and are mechanically fastened to an outer side of the hand-held machine tool (12) via a fastening interface (42) provided on the carrier unit (36).

7. Machine tool assembly (10) according to one of the preceding claims, wherein the hand-held machine tool (12) comprises a machine spindle (20) which is rotatable about a rotation axis (A), and wherein at least a portion of the illumination system (32) runs at least partially parallel to a circumference of the machine spindle (20).

8. Machine tool assembly (10) according to one of the preceding claims, wherein the hand-held machine tool (12) is a router.

9. Lighting system (32) for a machine tool assembly (10) according to one of the preceding claims, comprising: - the lighting unit (56) with at least one light source (58), wherein the lighting unit (56) can be aligned such that, in a use state of the lighting system (32), an engagement section of a tool (22) of the hand-held power tool (12) can be illuminated by means of the light source (58), - M - - the control unit (62) which is signal-technically connected to the lighting unit (56), wherein the control unit (62) is designed to operate the lighting unit (56) in a pulsed light mode, - the signal interface (70) which is signal-technically connected to the control unit (62), wherein the signal interface (70) is designed to receive a signal describing a movement state of the tool (22) so that in pulsed light operation an illumination state can be matched to the movement state by means of the control unit (62).

10. Lighting system (32) according to claim 9, wherein the signal interface (70) is designed to be signal-technically coupled to a motor control unit (94) for receiving the signal describing the movement state of the tool (22), wherein the motor control unit (94) is designed to control a brushless DC motor (96), wherein the DC motor (96) is in particular sensorless.

11. Lighting system (32) according to claim 9 or 10, comprising an energy interface (66) for supplying the lighting unit (56) and / or the control unit (62) with electrical energy.

12. The lighting system (32) of claim 11, comprising an electrical energy storage unit (64) coupled to the energy interface (66).

13. Lighting system (32) according to claim 11 or 12, wherein an energy harvesting unit is connected to the energy interface (66).

14. The lighting system (32) according to any one of claims 9 to 13, further comprising a support unit (36) having a mounting interface (42) for selectively mechanically mounting the support unit (36) on an outer side of the hand-held power tool (12), wherein the lighting unit (56) and the control unit (62) are mounted on the support unit (36).

15. Lighting system (32) according to one of claims 14, wherein the carrier unit (36) has at least one annular or ring-part-shaped section (38).

16. Lighting system (32) according to one of claims 9 to 15, wherein the lighting unit (56) comprises a plurality of light sources (58) and the light sources (58) are arranged along an arc line (60).

17. Lighting system (32) according to one of claims 9 to 16, wherein the signal interface (70) is designed to receive, as a signal describing the movement state of the tool (22), at least one of a signal describing an operating frequency of the tool (22) and a signal describing a tool position of the tool (22).

18. Lighting system (32) according to claim 17, comprising a sensor unit (72), wherein the sensor unit (72) is designed to detect the working frequency and / or the tool position and to generate the signal describing the working frequency and / or the tool position and is signal-technically coupled to the signal interface (70).

19. The lighting system (32) according to claim 14 and claim 18, wherein the sensor unit (72) comprises a carrier unit-side sensor element (74) attached to the carrier unit (36).

20. Lighting system (32) according to claim 18 or 19, wherein the sensor unit (72) comprises a tool-side sensor element (34) which can be coupled to the tool (22) or a drive element coupled to the tool (22) or which can be integrated into the tool (22) or the drive element.

21. Lighting system (32) according to claim 20, wherein the tool-side sensor element (34) is annular and has a fastening interface (78) on an inner circumference of the ring for coupling to the tool (22) or the drive element.

22. Lighting system (32) according to one of claims 9 to 21, wherein by means of the control unit (62) in pulsed light operation, at least one of an illumination frequency and an illumination phase position can be adjusted to the movement state of the tool (22) as the illumination state.

23. The illumination system (32) of claim 22, comprising an adjustment means (82) for manually modifying at least one of the illumination frequency and the Illumination phase in pulsed light operation, wherein the setting means (82) is signal-technically connected to the control unit (62).

24. Lighting system (32) according to one of claims 9 to 23, comprising a display unit (88) for displaying at least one of the operating state of the lighting system, warning message, error message and user feedback.

25. Lighting system (32) according to claim 24, wherein the display unit (88) comprises at least one display means (90) separate from the lighting unit (56), in particular wherein the display means (90) is attached to the carrier unit (36).

26. Lighting system (32) according to one of claims 9 to 25, if dependent on claim 13, comprising a safety sensor unit (84) which is fastened to the carrier unit (36), wherein the safety sensor unit (84) is designed to detect a human finger or a human hand in the region of the carrier unit (36), and wherein the safety sensor unit (84) is signal-coupled to the control unit (62) so that an operating state of the lighting unit (56) depends on a detection result of the Safety sensor unit (84) can be adjusted.

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